Children and teens exercise bike structure size analysis date:2017-07-06 09:57
Analysis of the structural dimensions of children's and teens' exercise bikes Liu Zhi 1, Cai Rui 2, Xue Anhu 3, Li Ran 2, He Shenjie 2, Jiang Chongmin 2 Structural features of exercise bikes. Methods: By measuring the body shape of 2,590 children and adolescents aged 718 years, based on the physical morphological characteristics of children and adolescents and the scientific riding posture, based on the basic structural design principles of bicycles, the children's and children's exercise bike cranks, saddles and handlebars were analyzed. The relative position and distance. 5. Results and Conclusion: The crank length of the children's and youth exercise bikes can be designed to be 11.817.7cm. The crank adjustment dimension of the same vehicle can be 5.9cm; the straight line distance from the saddle to the central axis of the crank can be designed to be between 34. 5cm when riding. When the angle between the line from the saddle to the central axis of the crank and the horizontal plane is 75°, the vertical adjustment dimension of the same vehicle saddle and the handlebar can be designed to be 24.1cm; the straight distance from the saddle to the handlebar can be Designed between 54.0110.4cm, the same car handlebars and saddle before and after the adjustment of the size can be designed in the foreword different ages of children and adolescents in the human body shape of the different, so in the exercise bike structure size requirements There is a certain difference. In the design of sports and fitness equipment, human body comfort and fitness efficiency is an important link. Taking into account the factors of different groups of people, reflecting the needs of different groups of people and closely integrating people and equipment, this is an inevitable trend in the design and development of sports and fitness equipment. The most important thing in sports and fitness equipment is the structure of the equipment, the size of the structure and the matching of human characteristics, which are directly related to the fitness effect. Based on the physical characteristics of children and adolescents, this study explores the adjustment of the size of part of the structure of the exercise bike in order to meet the needs of children and adolescents with different body shapes and sizes, and to provide for the development of children and adolescents' exercise equipment. 1 Excavating people's potential, comprehensively and balancedly giving full play to human functions, and promoting the development of human health master's tutors. The main research direction is physical fitness measurement and evaluation. Tel: (010) Anhu (1974-), male, Shanxi West, Engineer, the main research direction is Inner Mongolia, Ph.D., assistant researcher, the main research direction is the physical intervention and evaluation, Tel (010) General Administration of Sport Science, Beijing 100061, China; Shanxi O Ruite Health Industry Co., Ltd., Changzhi 046011, Shanxi, China. The size of the human body's morphological structure plays an important role in determining the dimensions of the equipment, the proportional relationship, and the rational design of the equipment. This study mainly focuses on the structural size and size adjustment range of young people's sports fitness training equipment. The selected morphological indicators in the research are mainly determined according to the “youth fitness equipment systemâ€. In order to more fully obtain the parameters of children and adolescents' body shape parameters required for this study, the study measured 2590 718-year-old children and adolescents. Major body morphological indicators 7 years old 8 years old 9 years old 10 years old 11 years old 12 years old 13 years old 14 years old 15 years old 15 Aged 16 Years 17 17 Years 18 Years Aggregate Women and Men Total Table 2 The study of 718 year old children and adolescents Major Body Morphological Indices Parameter Table2 TheParametersoftheMainlyPhysical Height Height Body Length Forearm Length Upper Arm Length Thigh Length Leg Height Increase Foot Note: Measurement Requirements: 1) Torso Length: Self Standing , measure the straight line distance from the shoulder point to the greater trochanter of the femur; 2) forearm length: arm extension, measuring the straight line distance from the sacrum point to the end point of the sacral styloid process; 3) the length of the upper arm: sagging and straightening the upper limb, measuring the shoulder point to The straight line distance from the epicondyle of the humerus; 4) The length of the thigh: stand naturally, measure the straight line distance from the greater trochanter to the epicondyle of the femur; 5) Increase the height of the lower leg: lift the leg, bend the knee and place the foot on the stool, lower leg and The stool surface is vertical, measuring the vertical height of the sacrum point to the stool surface. It will directly affect the reasonable treadmill speed during the fitness process, which will have an adverse effect on the comfort and fitness efficiency during the fitness process. From this measurement analysis, we can see that in China, the height of children aged 79, 1012, 1315, and 1618 is generally the height of the juvenile, and the adjustable length of crank cranks used by children and adolescents in different age groups should be 5.9cm (maximum-minimum value = 17.7-11.8cm). 3.2 The relative position between the saddle and the handlebar and the relative position between the handlebar and the saddle directly affect the position of the cyclist on the exercise bike. The correct riding posture does not make the body feel uncomfortable, and can improve the fitness efficiency. Under normal circumstances, in order to improve the riding efficiency during the bicycle race, the athlete maintains an angle between the torso and the saddle's horizontal plane at 20° to 60°, which is beneficial to cycling, according to the competition characteristics of different distances. At the same time, in the course of riding, the shoulder joint angle is maintained at 90°120°, the knee joint is 60°130°, and the elbow joint is negative at 95°180°. It is also an ideal posture for the athlete to ride. 35 3.2.1 Analysis of saddle height and adjustment dimensions Take the body morphological characteristics of a 79-year-old child as an example. When the vertical height of the saddle of the exercise bike is adjusted to the lowest point, ie H height is 0cm, and the saddle is adjusted horizontally to a distance of 0on. That is, when the distance of N is 0cm. At this time, the saddle height should be at least suitable for people of small size in this age group. Therefore, as can be seen from the ideal riding position requirements, when the BC and the CD do not coincide and form a straight line, the angle of the knee joint at this time should be the maximum, that is, 130 degrees. The shortest straight line distance from the bicycle saddle to the pedal used by people of this age group should be: BX, m = thigh length + calf plus height mhi - As can be seen from Table 2, 90% of children aged 79 years old in China The thigh length was 22.230.4cn and the calf height was approximately 28.936.5cm. By substituting the thigh length and leg height plus minimum value into the above formula, it can be obtained: since this time is suitable for a 79-year-old child with a small body size, the crank length should be the minimum value in the selected age group 11. 8cm. When the 79-year-old child uses the shortest linear distance BCmin from the saddle of the exercise bike to the central axis of the crank, it should be: Normally, when the angle between BC and the horizontal plane is 0 - generally about 75, the riding efficiency is the highest. At this time, the distance L should be: When the height of the bicycle saddle and the distance adjusted backwards are suitable for a 7-9-year-old with a tall body, similarly, according to the ideal riding position requirement, when BC and CD do not coincide and In a straight line, the angle of the knee joint should be at a maximum of 130 degrees. The BDmax from the saddle to the pedal of the fitness car used by people of this age group shall be: the position analysis diagram of the saddle of the exercise bike + leg height plus mx―2X thigh length maxX calf plus height maxXcS130° according to table 2 in 79 The children's thigh length and calf's height feature are added, and the maximum value is entered into the formula: Since this time is suitable for a 79-year-old child with a tall body, the crank length should be the maximum value for this age group. 14. 1cm, at this time, the maximum straight-line distance BCmx from the saddle to the crank central axis of the 79-year-old child's exercise bike should be 0cm. Therefore, the maximum height Hmax of the saddle seat vertical height for a 79-year-old child can be designed. For the 18-year-old people in different age groups, the range of the central axis of the saddle to the crank axle can be designed between 39.559.5cm and the maximum height of the saddle vertical adjustment H ax can be used by people of 718 years old. In the same exercise bike, the straight line distance from the saddle to the central axis of the crank should be within 34.659.5cm. The vertical adjustment dimension of the saddle can be designed as 24. 3.2.2 The height of the handlebar and the adjustment dimension analysis In general, The level of the vehicle body of the saddle and handlebar exercise bike or substantially the same, therefore, the level of the handlebar with reference to the level of the saddle can be designed and adjusted. Therefore, the height of the handlebars of children and youth exercise bikes should be basically the same as the saddle, that is, the height of the handlebars of the exercise bikes used by the 79, 1012, 1315, and 1618 children and adolescents is the maximum. Adjustable size can also be designed to be 11.6cm, 13.4cm, 13.8cm, 14.5cm; Similarly, if the 718-year-old people use the same exercise bike, handlebar height adjustment size can also be 24.1cm. 3.2.3 seats and cars The relative position and the forward and backward adjustment dimensions analysis the distance between the handlebar and the saddle is mainly determined by the riding position of the rider and the length of the arm and the length of the trunk, such as the distance between the two points, mainly by the length and the riding position. The joint angle formed is determined. In general, the more scientific and ideal riding posture in cycling competitions is between shoulder angles between 90° and 120° (up to), and between the trunk and saddle level between 20° and 60° (poor). The elbow joint is between 95° and 180° (4). 3.2.3.1 The analysis of the shortest distance from the bicycle handlebar to the saddle also takes the example of the body shape of a 79-year-old child. When the distance between the handlebars of the exercise bike is 0 cm forward, ie, M is 0 cm, the saddle is adjusted horizontally backwards. When the distance is 0cm and N is 0cm, the size of the exercise bike should meet the size of the 79-year-old. Therefore, the shortest distance from the handlebar to the saddle can be determined based on the body shape and riding position of a 79-year-old with a smaller body. According to the inference of the angle range of the body-related joints in the ideal riding posture, if the level of the handlebars of the exercise bike is the same as that of the saddle, during the riding process, when the arms are straightened (that is, the negative angle is 180°), the angle of the shoulder joints is 90°. When the riding position is up to 90° and the hands just touch and hold the handlebar, the distance between the handlebar and the saddle is the shortest. Therefore, the distance AB from the handlebar to the saddle calculated from the body shape characteristics of a 79-year-old with a small body size is the shortest design distance from the handlebar to the saddle. From Table 2, we can see that in the 79-year-old children in China, 90% of the population has a trunk length of 42.250. 3cm, a forearm length of 15. 019.5cm, and an upper arm length of 18.725.6cm. Therefore, the 79-year-old children's exercise bike handlebar ABmm from the shortest distance can be designed as: The longest distance analysis from the exercise bike handlebars to the saddle. Take the physique characteristics of the 79-year-old children as an example, when the fitness car handlebar forward level When the adjusting distance and saddle back leveling distance are suitable for people with a tall body in this age group, the longest distance to the saddle from the exercise bike handlebar used by that age group can be designed according to the height of the age group. Crowd body shape characteristics and riding position to determine. It is known from the inference of the angle range of the body-related joints in the ideal riding posture that if the level of the handlebars of the exercise bike is the same as that of the saddle, during the course of riding, the angle formed when the angle of the shoulder joints reaches 120 degrees between the trunk and the saddle is eliminated. When the 20° forearm is naturally positioned so that it can reach and hold the handlebar, the distance from the handlebar to the saddle is longest. Therefore, the distance ZVB between the handlebars and the saddle, which is calculated based on this riding posture and the body shape characteristics of the taller people in this age group, is the longest distance from the bicycle handlebar to the saddle used by people in this age group. . Therefore, according to the body shape parameters of the 79-year-old group in Table 2, the longest distance/VBmax from the bicycle to the saddle in this age group can be obtained by: (1) According to the sine theorem, the length of the trunk is maxXsin. The length of the trunk is m. Therefore, the GP value in the GP=FG-upper arm length max= is obtained as publicly available: Therefore, according to the calculation results in (1) and (2), the 79-year-old child's exercise bike is most suitable for the saddle. Long-distance ABmaxS: According to the above analysis, the sum of the maximum adjustment size of the 79-year-old child's exercise bike handlebar and the saddle, that is, M+N should be: Because in the adjustment process of the saddle and the handlebar, it is necessary to consider whether Ideal riding posture problem, therefore, saddle and handlebar adjustment dimensions should be equal to enable people of different sizes can adjust the appropriate riding position, so the 79-year-old children's fitness car handlebar and saddle before and after the maximum adjustable The dimensions can be designed as follows: 18-year-old people in different age groups use the distance from the saddle for the size of the distance from the saddle. The design is generally between 61.297.4cm, 68.0106.5cm and 70.1110.4cm; the maximum adjustable size of the handlebars and saddles Generally divided into 2cm. If the 718-year-old people use the same exercise bike, the maximum adjustable linear distance from the handlebar to the saddle is 56.4cm; the maximum adjustable size of the handlebar and the saddle is 28. Fitness equipment is used by children and adolescents. Scientific fitness equipment The basic requirements for safe and comfortable physical training are to enable children and adolescents to achieve physical fitness and health promotion through physical exercise. As we all know, children and adolescents is an important period of growth and development. During this period, a series of physiological changes will gradually occur in various parts of the human body. Body shape is the manifestation of the human body under certain conditions, showing a marked rapid change during growth and development. For the 718-year-old children and adolescents, the fastest phase of physical growth of boys and girls is basically the same, basically at the age of 714. 4. Therefore, the body shape of children and adolescents in different age groups may show a greater difference. Therefore, when designing sports and fitness equipment for children and adolescents, it is necessary to fully consider the difference in body shape between children and adolescents of different age groups and gender groups. Only when the differences in different groups of people are taken into consideration in the design, can children be achieved. Juvenile sports fitness equipment more scientific and rational development. When the human body form is used as the basis for the design of the equipment, a double limit design is generally used, referring to the use of two human body form size percentiles as the upper and lower limits of the size 5. To make fitness The equipment can be suitably used by people with different body shapes and sizes. In determining the size of the fitness equipment, generally 5%, 50%, and 95% percentiles are taken as the basis for the design of the structural size. 4.2 Ergonomics and Fitness Design Ergonomics is the basic object of human-machine-environmental systems research. It uses physiology, psychology, and other related discipline knowledge to rationally distribute people based on the conditions and characteristics of people and machines. With the machine's operating functions and adaptability to each other, it creates a comfortable and safe working environment for humans and makes ergonomics an optimal comprehensive discipline. It has become an indispensable tool for all engineering and technical personnel. The important means of achieving the goals of industrial design 2. The application of ergonomics in the design of exercise bikes will make the overall structure design of exercise bikes more rational and comfortable. Ergonomics is more and more widely used in the design of fitness equipment, from the overall structural design of the equipment to the design of various parts and components are indispensable. This study mainly provides the application of ergonomics on the exercise bike. Through the analysis of the functional dimensions of the crank, saddle, and handle of children's and children's exercise bikes, it not only determines the design of children's and young people's exercise bikes, but also lays a foundation for structural design. The foundation, at the same time, also strives to achieve the unity of comfort and safety. Similarly, in the design of various types of fitness equipment in the future, how to conduct a comprehensive and rational ergonomic design analysis of the fitness equipment so as to meet the physiological and psychological requirements of the human body will be the key to the scientific design of the equipment. Conclusion Based on the ergonomics theory and the physical characteristics of children and adolescents, this study concluded that some of the major structural dimensions of the 718-year-old children's exercise bike can be designed as follows: 1. The crank length of the exercise bike can be designed to be between 11.817.7cm. , The same car can be adjusted to a size of 5.9cm; (Downcast Seal III) marking or other machined shoe parts machine (A43D8/00, frequency 3 times); special fastenings for shoes (8 43C11/ 00, frequency 3 times); heel, heel design (A43B21/00, frequency 3 times); pre-processing machinery or the upper parts, upper heel or insole to the shoe last to prepare for the operation of the machine (A43D11 /00, frequency 2). The research frequency totaled 27 times, accounting for 33.75% of the entire symbiotic technology. 3. The emerging technology in Nike's technology symbiosis: Part A involved shoe material features, shoe inserts, and inlays that cover the instep (A43B1/00, A43B19 /00) and nine main groups of B, C, D, F, and G departments. The research frequency totaled 9 times, accounting for 11.25% of the total symbiosis technology.—In 2011, five Chinese enterprises had a small technical symbiosis in the patent cooperation research and development of sports shoes, mainly concentrated in A43B13/00, A43B7/00, and these two technologies occupied. In addition to 87.5% of the symbiosis techniques other than elegant birds, the technical homogeneity of patent applications for sports shoes developed in cooperation with other patents other than elegant birds is very high. The symbiotic technology of the noble birds is only two A43C11/00, A43B23/02. The lack of symbiosis technology reflects the narrow technical aspects of patent research and development of sports shoes in China, the low frequency of cooperative research, and the depth of cooperation in research and development is still shallow. As a result, the homogeneity of the technical content in the patent research and development of sports shoes is too high, and it is difficult to adapt to the rapid transition in the increasingly fierce competition in the market of sports shoes. At the same time, the competition among domestic enterprises is in an unordered state. , Part B, Part C, Part D, Part F, Part G Department of Zhejiang Hung Hom Part A Beijing Befa Information Department A Department of Prestige Bird A Department of Zibo Chuanglian Technology Department A Department of Double Star Company A (Plan 84) Saddle to Crank The linear distance of the central axis can be designed to be between 34.659.5cm. When the angle between the saddle to the central axis of the crank and the horizontal plane in the riding is 75°, the maximum vertical adjustment of the same vehicle saddle and handlebar The dimensions can be designed to be 24.1cm; the straight-line distance from the saddle to the handlebars can be designed between 54.0110.4cm, and the adjustable dimensions of the same trolley cart and saddle can be designed as
2.Solid siliccone compression machine and liquid silicone injection machine
3.Disney and Sedex 4P audit factory
4.ISO 9001,IATF16949,Raw material of FDA LFGB MSDS Certificates
. Look forward to your cooperation!
Analysis of the structural dimensions of children's and teens' exercise bikes Liu Zhi 1, Cai Rui 2, Xue Anhu 3, Li Ran 2, He Shenjie 2, Jiang Chongmin 2 Structural features of exercise bikes. Methods: By measuring the body shape of 2,590 children and adolescents aged 718 years, based on the physical morphological characteristics of children and adolescents and the scientific riding posture, based on the basic structural design principles of bicycles, the children's and children's exercise bike cranks, saddles and handlebars were analyzed. The relative position and distance. 5. Results and Conclusion: The crank length of the children's and youth exercise bikes can be designed to be 11.817.7cm. The crank adjustment dimension of the same vehicle can be 5.9cm; the straight line distance from the saddle to the central axis of the crank can be designed to be between 34. 5cm when riding. When the angle between the line from the saddle to the central axis of the crank and the horizontal plane is 75°, the vertical adjustment dimension of the same vehicle saddle and the handlebar can be designed to be 24.1cm; the straight distance from the saddle to the handlebar can be Designed between 54.0110.4cm, the same car handlebars and saddle before and after the adjustment of the size can be designed in the foreword different ages of children and adolescents in the human body shape of the different, so in the exercise bike structure size requirements There is a certain difference. In the design of sports and fitness equipment, human body comfort and fitness efficiency is an important link. Taking into account the factors of different groups of people, reflecting the needs of different groups of people and closely integrating people and equipment, this is an inevitable trend in the design and development of sports and fitness equipment. The most important thing in sports and fitness equipment is the structure of the equipment, the size of the structure and the matching of human characteristics, which are directly related to the fitness effect. Based on the physical characteristics of children and adolescents, this study explores the adjustment of the size of part of the structure of the exercise bike in order to meet the needs of children and adolescents with different body shapes and sizes, and to provide for the development of children and adolescents' exercise equipment. 1 Excavating people's potential, comprehensively and balancedly giving full play to human functions, and promoting the development of human health master's tutors. The main research direction is physical fitness measurement and evaluation. Tel: (010) Anhu (1974-), male, Shanxi West, Engineer, the main research direction is Inner Mongolia, Ph.D., assistant researcher, the main research direction is the physical intervention and evaluation, Tel (010) General Administration of Sport Science, Beijing 100061, China; Shanxi O Ruite Health Industry Co., Ltd., Changzhi 046011, Shanxi, China. The size of the human body's morphological structure plays an important role in determining the dimensions of the equipment, the proportional relationship, and the rational design of the equipment. This study mainly focuses on the structural size and size adjustment range of young people's sports fitness training equipment. The selected morphological indicators in the research are mainly determined according to the “youth fitness equipment systemâ€. In order to more fully obtain the parameters of children and adolescents' body shape parameters required for this study, the study measured 2590 718-year-old children and adolescents. Major body morphological indicators 7 years old 8 years old 9 years old 10 years old 11 years old 12 years old 13 years old 14 years old 15 years old 15 Aged 16 Years 17 17 Years 18 Years Aggregate Women and Men Total Table 2 The study of 718 year old children and adolescents Major Body Morphological Indices Parameter Table2 TheParametersoftheMainlyPhysical Height Height Body Length Forearm Length Upper Arm Length Thigh Length Leg Height Increase Foot Note: Measurement Requirements: 1) Torso Length: Self Standing , measure the straight line distance from the shoulder point to the greater trochanter of the femur; 2) forearm length: arm extension, measuring the straight line distance from the sacrum point to the end point of the sacral styloid process; 3) the length of the upper arm: sagging and straightening the upper limb, measuring the shoulder point to The straight line distance from the epicondyle of the humerus; 4) The length of the thigh: stand naturally, measure the straight line distance from the greater trochanter to the epicondyle of the femur; 5) Increase the height of the lower leg: lift the leg, bend the knee and place the foot on the stool, lower leg and The stool surface is vertical, measuring the vertical height of the sacrum point to the stool surface. It will directly affect the reasonable treadmill speed during the fitness process, which will have an adverse effect on the comfort and fitness efficiency during the fitness process. From this measurement analysis, we can see that in China, the height of children aged 79, 1012, 1315, and 1618 is generally the height of the juvenile, and the adjustable length of crank cranks used by children and adolescents in different age groups should be 5.9cm (maximum-minimum value = 17.7-11.8cm). 3.2 The relative position between the saddle and the handlebar and the relative position between the handlebar and the saddle directly affect the position of the cyclist on the exercise bike. The correct riding posture does not make the body feel uncomfortable, and can improve the fitness efficiency. Under normal circumstances, in order to improve the riding efficiency during the bicycle race, the athlete maintains an angle between the torso and the saddle's horizontal plane at 20° to 60°, which is beneficial to cycling, according to the competition characteristics of different distances. At the same time, in the course of riding, the shoulder joint angle is maintained at 90°120°, the knee joint is 60°130°, and the elbow joint is negative at 95°180°. It is also an ideal posture for the athlete to ride. 35 3.2.1 Analysis of saddle height and adjustment dimensions Take the body morphological characteristics of a 79-year-old child as an example. When the vertical height of the saddle of the exercise bike is adjusted to the lowest point, ie H height is 0cm, and the saddle is adjusted horizontally to a distance of 0on. That is, when the distance of N is 0cm. At this time, the saddle height should be at least suitable for people of small size in this age group. Therefore, as can be seen from the ideal riding position requirements, when the BC and the CD do not coincide and form a straight line, the angle of the knee joint at this time should be the maximum, that is, 130 degrees. The shortest straight line distance from the bicycle saddle to the pedal used by people of this age group should be: BX, m = thigh length + calf plus height mhi - As can be seen from Table 2, 90% of children aged 79 years old in China The thigh length was 22.230.4cn and the calf height was approximately 28.936.5cm. By substituting the thigh length and leg height plus minimum value into the above formula, it can be obtained: since this time is suitable for a 79-year-old child with a small body size, the crank length should be the minimum value in the selected age group 11. 8cm. When the 79-year-old child uses the shortest linear distance BCmin from the saddle of the exercise bike to the central axis of the crank, it should be: Normally, when the angle between BC and the horizontal plane is 0 - generally about 75, the riding efficiency is the highest. At this time, the distance L should be: When the height of the bicycle saddle and the distance adjusted backwards are suitable for a 7-9-year-old with a tall body, similarly, according to the ideal riding position requirement, when BC and CD do not coincide and In a straight line, the angle of the knee joint should be at a maximum of 130 degrees. The BDmax from the saddle to the pedal of the fitness car used by people of this age group shall be: the position analysis diagram of the saddle of the exercise bike + leg height plus mx―2X thigh length maxX calf plus height maxXcS130° according to table 2 in 79 The children's thigh length and calf's height feature are added, and the maximum value is entered into the formula: Since this time is suitable for a 79-year-old child with a tall body, the crank length should be the maximum value for this age group. 14. 1cm, at this time, the maximum straight-line distance BCmx from the saddle to the crank central axis of the 79-year-old child's exercise bike should be 0cm. Therefore, the maximum height Hmax of the saddle seat vertical height for a 79-year-old child can be designed. For the 18-year-old people in different age groups, the range of the central axis of the saddle to the crank axle can be designed between 39.559.5cm and the maximum height of the saddle vertical adjustment H ax can be used by people of 718 years old. In the same exercise bike, the straight line distance from the saddle to the central axis of the crank should be within 34.659.5cm. The vertical adjustment dimension of the saddle can be designed as 24. 3.2.2 The height of the handlebar and the adjustment dimension analysis In general, The level of the vehicle body of the saddle and handlebar exercise bike or substantially the same, therefore, the level of the handlebar with reference to the level of the saddle can be designed and adjusted. Therefore, the height of the handlebars of children and youth exercise bikes should be basically the same as the saddle, that is, the height of the handlebars of the exercise bikes used by the 79, 1012, 1315, and 1618 children and adolescents is the maximum. Adjustable size can also be designed to be 11.6cm, 13.4cm, 13.8cm, 14.5cm; Similarly, if the 718-year-old people use the same exercise bike, handlebar height adjustment size can also be 24.1cm. 3.2.3 seats and cars The relative position and the forward and backward adjustment dimensions analysis the distance between the handlebar and the saddle is mainly determined by the riding position of the rider and the length of the arm and the length of the trunk, such as the distance between the two points, mainly by the length and the riding position. The joint angle formed is determined. In general, the more scientific and ideal riding posture in cycling competitions is between shoulder angles between 90° and 120° (up to), and between the trunk and saddle level between 20° and 60° (poor). The elbow joint is between 95° and 180° (4). 3.2.3.1 The analysis of the shortest distance from the bicycle handlebar to the saddle also takes the example of the body shape of a 79-year-old child. When the distance between the handlebars of the exercise bike is 0 cm forward, ie, M is 0 cm, the saddle is adjusted horizontally backwards. When the distance is 0cm and N is 0cm, the size of the exercise bike should meet the size of the 79-year-old. Therefore, the shortest distance from the handlebar to the saddle can be determined based on the body shape and riding position of a 79-year-old with a smaller body. According to the inference of the angle range of the body-related joints in the ideal riding posture, if the level of the handlebars of the exercise bike is the same as that of the saddle, during the riding process, when the arms are straightened (that is, the negative angle is 180°), the angle of the shoulder joints is 90°. When the riding position is up to 90° and the hands just touch and hold the handlebar, the distance between the handlebar and the saddle is the shortest. Therefore, the distance AB from the handlebar to the saddle calculated from the body shape characteristics of a 79-year-old with a small body size is the shortest design distance from the handlebar to the saddle. From Table 2, we can see that in the 79-year-old children in China, 90% of the population has a trunk length of 42.250. 3cm, a forearm length of 15. 019.5cm, and an upper arm length of 18.725.6cm. Therefore, the 79-year-old children's exercise bike handlebar ABmm from the shortest distance can be designed as: The longest distance analysis from the exercise bike handlebars to the saddle. Take the physique characteristics of the 79-year-old children as an example, when the fitness car handlebar forward level When the adjusting distance and saddle back leveling distance are suitable for people with a tall body in this age group, the longest distance to the saddle from the exercise bike handlebar used by that age group can be designed according to the height of the age group. Crowd body shape characteristics and riding position to determine. It is known from the inference of the angle range of the body-related joints in the ideal riding posture that if the level of the handlebars of the exercise bike is the same as that of the saddle, during the course of riding, the angle formed when the angle of the shoulder joints reaches 120 degrees between the trunk and the saddle is eliminated. When the 20° forearm is naturally positioned so that it can reach and hold the handlebar, the distance from the handlebar to the saddle is longest. Therefore, the distance ZVB between the handlebars and the saddle, which is calculated based on this riding posture and the body shape characteristics of the taller people in this age group, is the longest distance from the bicycle handlebar to the saddle used by people in this age group. . Therefore, according to the body shape parameters of the 79-year-old group in Table 2, the longest distance/VBmax from the bicycle to the saddle in this age group can be obtained by: (1) According to the sine theorem, the length of the trunk is maxXsin. The length of the trunk is m. Therefore, the GP value in the GP=FG-upper arm length max= is obtained as publicly available: Therefore, according to the calculation results in (1) and (2), the 79-year-old child's exercise bike is most suitable for the saddle. Long-distance ABmaxS: According to the above analysis, the sum of the maximum adjustment size of the 79-year-old child's exercise bike handlebar and the saddle, that is, M+N should be: Because in the adjustment process of the saddle and the handlebar, it is necessary to consider whether Ideal riding posture problem, therefore, saddle and handlebar adjustment dimensions should be equal to enable people of different sizes can adjust the appropriate riding position, so the 79-year-old children's fitness car handlebar and saddle before and after the maximum adjustable The dimensions can be designed as follows: 18-year-old people in different age groups use the distance from the saddle for the size of the distance from the saddle. The design is generally between 61.297.4cm, 68.0106.5cm and 70.1110.4cm; the maximum adjustable size of the handlebars and saddles Generally divided into 2cm. If the 718-year-old people use the same exercise bike, the maximum adjustable linear distance from the handlebar to the saddle is 56.4cm; the maximum adjustable size of the handlebar and the saddle is 28. Fitness equipment is used by children and adolescents. Scientific fitness equipment The basic requirements for safe and comfortable physical training are to enable children and adolescents to achieve physical fitness and health promotion through physical exercise. As we all know, children and adolescents is an important period of growth and development. During this period, a series of physiological changes will gradually occur in various parts of the human body. Body shape is the manifestation of the human body under certain conditions, showing a marked rapid change during growth and development. For the 718-year-old children and adolescents, the fastest phase of physical growth of boys and girls is basically the same, basically at the age of 714. 4. Therefore, the body shape of children and adolescents in different age groups may show a greater difference. Therefore, when designing sports and fitness equipment for children and adolescents, it is necessary to fully consider the difference in body shape between children and adolescents of different age groups and gender groups. Only when the differences in different groups of people are taken into consideration in the design, can children be achieved. Juvenile sports fitness equipment more scientific and rational development. When the human body form is used as the basis for the design of the equipment, a double limit design is generally used, referring to the use of two human body form size percentiles as the upper and lower limits of the size 5. To make fitness The equipment can be suitably used by people with different body shapes and sizes. In determining the size of the fitness equipment, generally 5%, 50%, and 95% percentiles are taken as the basis for the design of the structural size. 4.2 Ergonomics and Fitness Design Ergonomics is the basic object of human-machine-environmental systems research. It uses physiology, psychology, and other related discipline knowledge to rationally distribute people based on the conditions and characteristics of people and machines. With the machine's operating functions and adaptability to each other, it creates a comfortable and safe working environment for humans and makes ergonomics an optimal comprehensive discipline. It has become an indispensable tool for all engineering and technical personnel. The important means of achieving the goals of industrial design 2. The application of ergonomics in the design of exercise bikes will make the overall structure design of exercise bikes more rational and comfortable. Ergonomics is more and more widely used in the design of fitness equipment, from the overall structural design of the equipment to the design of various parts and components are indispensable. This study mainly provides the application of ergonomics on the exercise bike. Through the analysis of the functional dimensions of the crank, saddle, and handle of children's and children's exercise bikes, it not only determines the design of children's and young people's exercise bikes, but also lays a foundation for structural design. The foundation, at the same time, also strives to achieve the unity of comfort and safety. Similarly, in the design of various types of fitness equipment in the future, how to conduct a comprehensive and rational ergonomic design analysis of the fitness equipment so as to meet the physiological and psychological requirements of the human body will be the key to the scientific design of the equipment. Conclusion Based on the ergonomics theory and the physical characteristics of children and adolescents, this study concluded that some of the major structural dimensions of the 718-year-old children's exercise bike can be designed as follows: 1. The crank length of the exercise bike can be designed to be between 11.817.7cm. , The same car can be adjusted to a size of 5.9cm; (Downcast Seal III) marking or other machined shoe parts machine (A43D8/00, frequency 3 times); special fastenings for shoes (8 43C11/ 00, frequency 3 times); heel, heel design (A43B21/00, frequency 3 times); pre-processing machinery or the upper parts, upper heel or insole to the shoe last to prepare for the operation of the machine (A43D11 /00, frequency 2). The research frequency totaled 27 times, accounting for 33.75% of the entire symbiotic technology. 3. The emerging technology in Nike's technology symbiosis: Part A involved shoe material features, shoe inserts, and inlays that cover the instep (A43B1/00, A43B19 /00) and nine main groups of B, C, D, F, and G departments. The research frequency totaled 9 times, accounting for 11.25% of the total symbiosis technology.—In 2011, five Chinese enterprises had a small technical symbiosis in the patent cooperation research and development of sports shoes, mainly concentrated in A43B13/00, A43B7/00, and these two technologies occupied. In addition to 87.5% of the symbiosis techniques other than elegant birds, the technical homogeneity of patent applications for sports shoes developed in cooperation with other patents other than elegant birds is very high. The symbiotic technology of the noble birds is only two A43C11/00, A43B23/02. The lack of symbiosis technology reflects the narrow technical aspects of patent research and development of sports shoes in China, the low frequency of cooperative research, and the depth of cooperation in research and development is still shallow. As a result, the homogeneity of the technical content in the patent research and development of sports shoes is too high, and it is difficult to adapt to the rapid transition in the increasingly fierce competition in the market of sports shoes. At the same time, the competition among domestic enterprises is in an unordered state. , Part B, Part C, Part D, Part F, Part G Department of Zhejiang Hung Hom Part A Beijing Befa Information Department A Department of Prestige Bird A Department of Zibo Chuanglian Technology Department A Department of Double Star Company A (Plan 84) Saddle to Crank The linear distance of the central axis can be designed to be between 34.659.5cm. When the angle between the saddle to the central axis of the crank and the horizontal plane in the riding is 75°, the maximum vertical adjustment of the same vehicle saddle and handlebar The dimensions can be designed to be 24.1cm; the straight-line distance from the saddle to the handlebars can be designed between 54.0110.4cm, and the adjustable dimensions of the same trolley cart and saddle can be designed as
BPA Free Food Grade Silicone Teething Pcifier Clip. BPA Free, PVC Free, Lead Free, Metals Free, Phthalate Free and Rust Free,Keep your baby's pacifier and silicon clip within easy reach and fall off dirty floors or get lost. Enable active gums to exercise and promote the development of strong healthy teeth and gums.The Silicone clips are compatible to fit with any pacifiers, teether toys, soothies, drool bibs, clothes, teething toys, blankets, strollers, play gyms and car seats. The chewable pacifier clips provide instant teething relief and gum massage. Vibrant colours for visual perception, motor, sensory development.Easy to clean, the baby pacifier clip is easy to clean, just need to wipe it with with soapy water or clean water, it is recommended to dry with paper towel or air dry before use, can withstand a temperature range of degree centigrade from minus 40 degree centigrade to 200 degree centigrade, steam, boiling water and dishwasher safe.
YDS Product categories of Silicone For Baby, we are specialized manufacturers from China, Silicone Baby Spoon, Silicone Baby Bibs Silicone Teething Toys,Silicone Plate & Placemat,Silicone Pacifier Holder,Silicone Pacifier & Nipple,Silicone Bowl wholesale high-quality products of Silicone Baby Products Our Factory Advantages:
1.Mold workshop and 2D and 3D engineer department
2.Solid siliccone compression machine and liquid silicone injection machine
3.Disney and Sedex 4P audit factory
4.ISO 9001,IATF16949,Raw material of FDA LFGB MSDS Certificates
. Look forward to your cooperation!
2.Solid siliccone compression machine and liquid silicone injection machine
3.Disney and Sedex 4P audit factory
4.ISO 9001,IATF16949,Raw material of FDA LFGB MSDS Certificates
. Look forward to your cooperation!
Food Grade Pacifier Clip,Silicone Teething Beads Clip,Food Grade Pacifier Holder,Silicone Baby Holder
Shenzhen Yindingsheng Technology Co., Ltd , https://www.oemsiliconeyds.com