JP2017121815A - Crank for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in a conventional crank such that a size of the conventional crank is fixed, and a position of a saddle is adjusted when a knee is excessively bent during travel and therefore travel is hard.SOLUTION: A crank composed of a component and a component E1, in which a space 8 for locating the component 1E, in which the component is provided with an opening 7 for fitting of a crank shaft at an upper part thereof, a recess for locating a compression coil spring 9 in the interior thereof and an opening 7B for fitting of a pedal at a lower part thereof, is provided, and thus, the component 1E can vertically move inside the component when a load on the pedal exceeds a constant value by action of the compression coil spring 9.SELECTED DRAWING: Figure 5

Description

This name relates to a bicycle crank that can move up and down.

In the case of the conventional crank, there was no bicycle crank that could move up and down.

Of course, there are individual differences, but it was difficult to run if the knees were bent too much while riding a bicycle, so the only way to raise the position of the saddle was.

Further, when the position of the saddle is increased, the center of gravity of the body is increased, which causes a problem in safety due to poor stability, for example, when the vehicle is running, temporarily stopped, or stopped.

The taller the person, the higher the ratio of leg length to height, and the lower the ratio of trunk length. In other words, the leg length difference is much larger than the trunk length difference when comparing tall and low people. Therefore, it is not appropriate to determine the crank length based on the height instead of the leg length.

Including motor-assisted bicycles, etc., but especially called city cycles, light vehicles or popular names mamachari, but not limited to practical vehicles mainly used for short-distance shopping, commuting, commuting and pottering, etc. It was difficult to run when the knees were bent too much, and the only way was to raise the saddle so that the toes reached the ground when stopped.

Of course, when stopping suddenly, especially when it is temporarily stopped or stopped, it is preferable to stop on the entire foot rather than on the toes on the road. In many cases, raising the position of the saddle during traveling increases the center of gravity of the body, and there are cases where there is a danger even when stopping, as well as sudden stop.

As described above, by increasing the position of the saddle, the stability during running and stopping is poor, and the lower the position of the saddle, the more stable and the safety is improved.

As described above, the present invention seeks to solve the problems of the conventional bicycle crank configuration by using a compression coil spring.

In order to solve the above problems, a description will be given of a bicycle crank that can be moved up and down according to the present invention.

A member 1E composed of a member 1C and a member 1D, and a member 1B composed of a member 1 and a member 1A are composed of a pair of cranks 2, and a space portion is formed inside the member 1B. 7 and the member 1E described above is provided on the pair of cranks 2 that can move up and down when the pedal 13 and 13A exceed a certain load by the action of the compression coil spring 9. This is a bicycle crank 2 that can move up and down.

The member 1B provided with the opening 7 for attaching the crankshaft 3 to the upper part of the member 1B described above, the opening 7B for attaching the pedals 13 and 13A to the lower part, and the compression coil spring 9 on the inner side. And a guide course 14 for the concave portion 5 for inserting the above-described member 1A on the upper surface in the longitudinal direction, and a convex portion 6 for preventing the compression coil spring 9 from falling off at the lower portion. This is a bicycle crank 2 that can be moved up and down.

A hemispherical shape for providing compression coil springs 9 on the left and right side surfaces in the longitudinal direction of a member 1E configured by attaching the member 1C and the member 1D provided on the inner side of the member 1B described above with a cylindrical pin 11, or this character shape This is a crank 2 for a bicycle that can move up and down.

When the compression coil spring 9 of the crank 2 described above is broken, the member is removed from the crankshaft 3, the member 1A constituting the member 1B is further removed from the upper direction, and the member 1C constituting the member 1E is removed. The above-described compression coil spring 9 can be exchanged by removing the cylindrical pin 11 of the member 1D and pulling it out in the HH ′ direction.

By using the bicycle crank 2 described above, the problems of the conventional crank described below can be solved.

There are many bicycle accidents at present, but of course there are many cases due to carelessness and traffic violations of the traveling vehicle, but by raising the position of the saddle, the center of gravity of the body becomes higher, As a result, when the vehicle is temporarily stopped or stopped, the body is supported by only one of the toe portions, so that the stability is poor, and as a result, an injury or accident is likely to occur.

Of course, there are individual differences, but the majority of practical vehicles currently in common use are almost 26-27 inches tire size. It is difficult and most people use a saddle with a high position.

For this reason, the position of the saddle is increased in the range where the toes reach the road surface at the time of stopping, and it is often used so that the knee does not bend too much during traveling.

However, the higher the position of the saddle, the higher the center of gravity of the body, so the stability deteriorates during running and especially when stopped, resulting in a problem with safety.

For example, in the case of a crank that can move up and down even if the crank size is the same as the conventional one, the position of the lower pedal that is stepped on by the action of the compression coil spring is the same as the conventional one, but the other The position of the upper pedal is lower by the action of the compression coil spring, and as a result of the shortening, even if the saddle position is lowered, it can run as before, As a result, the center of gravity of the body has become low, such as during running and when stopped, improving stability and safety.

Further, the number and size of the compression coil springs provided on the left and right sides of the crank are not limited as long as they can be moved vertically.

As mentioned above, the saddle position can be lowered by reducing the size of the crank at the upper position while driving, and the center of gravity of the body during driving and when stopping is lowered, so stability and safety are reduced. Will improve.

Furthermore, regarding the materials used, steel, aluminum, titanium and carbon used in the frame material, and reinforced plastic are preferable, but it is not limited as long as the strength can be maintained as a crank. Needless to say.

The problems described below with the conventional crank can be solved.

Also, by using a vertically movable crank, when the pedal is depressed from the uppermost position, the angle at which the knee bends is reduced, so that the pedal can be easily depressed and acceleration can be easily achieved.

The tire size of the bicycle that is overwhelmingly used in the market share is 26 to 27 inches, but if the knee is bent too much when riding a bicycle, it will be difficult to run because it will put a burden on the knee when stepping on. In this case, the saddle position is set high, but it becomes unstable because the center of gravity of the body becomes high, even during a pause, as well as during running, and easily leads to an accident or the like.

In addition, when riding a bicycle with a heel at the tip, and with heavy luggage in the heel, there are individual differences, but during normal running, at the time of pause or stop, one or both of the left and right toes In many cases, however, the steering wheel operation becomes difficult, but the saddle position can be set lower than the conventional driving position, and the stability and safety are improved. Easy to do.

In the case of a vertically movable crank provided with a compression coil spring, the manufacturing process is easy and the manufacturing cost is low.

Conventionally, the main tire sizes are mostly 26 and 27 inches, but if the tire size is larger, for example, 29, 30, or 31, the crank size will naturally be longer, but the knees will bend too much during running. Although the position of the saddle is further increased without changing, the center of gravity of the body can be lowered by using the crank that can move up and down according to the present invention. This is a bicycle crank that can be moved up and down, which can contribute to the reduction of accidents and the like, because it improves safety at the time of a temporary stop as well as during traveling.

In addition, a general utility vehicle is also included, but even in the case of other amusement or small cars, the less the knee bends during traveling, the less the stepping force is reduced and the easier it is to step on. In addition, there are many people who run in a forward bent posture with the saddle position raised, but even when the saddle position is lowered by lowering the crank when depressed, the handle position is lowered in the same way as the lowered position. As a result, the crank can run in the same posture as before, and can greatly contribute to the reduction of injuries and accidents as a result of improved stability and safety.

Embodiments according to examples will be described in more detail with reference to FIGS. 1 to 18. Needless to say, the scope of the present invention is within the scope of the claims and is not limited to the following embodiments.
Hereinafter, the form of the first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a plan view of the inside of a member 1 constituting the member 1B of the crank 2 with the member 1 and the member 1A, 7 is an opening for attaching the crankshaft 3, and 8 is a member 1E in FIG. 2 and the space 8 for providing the compression coil spring 9, and the guide 15 of the convex portion 6 provided on the inner longitudinal direction surface of FIG. 2 can be inserted from the upper direction on the upper left and right surfaces in the longitudinal direction. It is a member 1 provided with a guide course 14 for a concave portion 5, and it is preferable that both guides 6 and the guide course 14 are provided in a divergent shape so as not to come off, but other means are not limited. .
2 is a plan view showing the inside of the member 1A constituting the member 1B inserted from above the member 1 shown in FIG. 1, and 7A is an opening for attaching the crankshaft 3. FIG. 6 is a convex portion provided in the guide 15.

FIG. 3 is a plan view showing a member 1E composed of a member 1C and a member 1D. Although not illustrated, a compression coil spring 9 is provided on the left and right sides in the longitudinal direction as shown in FIG. 5B is an opening for attaching the pedal 13, 5B is a concave portion 5B for attaching the convex portion 6A of the member 1C, and provided in both the members 1C and 1D. 2 are attached to the holes 10A and 10B with the cylindrical pin 11 provided with the hole 10. If the effect of the compression coil spring 9 described above is drastically reduced, the member 1A described in FIG. The member 1E is provided so as to be removed and removable from the hole 10 of the cylindrical pin 11 using a jig.

FIG. 4 is a side view in the A-A ′ direction shown in FIG. 3. The member 1E is composed of a member 1C and a member 1D, and 5A is a semicircular shape for providing a compression coil spring 9 for allowing the inside of the member 1B shown in FIG. 7 to move up and down. Or it is these character-shaped recessed parts 5A and 5C.

FIG. 5 is a plan view showing the state in which the compression coil spring 9 and the member 1E are inserted from the lower direction into the space 8 inside the member 1 constituting the member 1B. 7 is an opening for attaching the crankshaft 3, 1C is a member constituting the member 1E, 8 is a space, 9 is a compression coil spring, 5 is provided in the guide course 14 In addition, 6A is a convex part of the member 1C, 5B is a concave part for attaching the convex part of the member 1D, 10A and 10B are holes for attaching cylindrical pins, and 7B is a pedal shaft. 4 is an opening for mounting.

FIG. 6 is a plan view in which the member 1 </ b> E is inserted into the space 8 of the member 1. 1 is a member 1, 1C is a member provided with a convex portion 6A for attaching to the concave portion 5B of 1D, and 1D is a member provided with a concave portion 5B for attaching the convex portion of the member 1C. Yes, 5 is a guide course 14 of the shape of the recess 5, 11 is a member 1E attaching the concave and convex portions 5B and 6A of the member 1C and member 1D to the cylindrical pin 11, and the member 1E is the member 1C and member 1D Can be attached by removing the cylindrical pin 11 and pulling out the member 1D in the direction of HH ′.

FIG. 7 is a plan view showing the crank 2 provided as a pair of the member 1B and the member 1E.
7 is an opening for attaching the crankshaft 3, 7B is an opening for attaching the pedal 13, and is a plan view of a pair of cranks 2 composed of a member 1B and a member 1E.

FIG. 8 is a side view showing the crank 2 in the E-E ′ direction of FIG. 7. The member 1B is composed of the member 1 and the member 1A, and the member 1E is composed of the member 1C and the member 1D. And it is a side view of a pair of crank 2 comprised by the member 1E which can move the inner side of the above description inside the member 1B by the effect | action of the compression coil spring 9. As shown in FIG.

FIG. 9 is a plan view of the crank 2 in which the upper part is attached to the crankshaft 2 and the lower part via the pedal shaft 4 with the pedal 13 attached with bolts 12 and 12A. 12 is a bolt for attaching the crankshaft 3, 1B is a member, 4 is a pedal shaft, and 12A is a bolt for attaching the pedal.

FIG. 10 is a side view of the crank 2 showing the F-F ′ direction in FIG. 9. The crank 2 is composed of a member 1B and a member 1E, 3 is a crankshaft, and 13 is a pedal attached to the pedal shaft 4.

FIG. 11 is a side view showing the crank 2 in the G-G ′ direction of FIG. 9. 3 is a crankshaft 3, a member 1E composed of members 1C and 1D, and a member 1B and 9 composed of members 1 and 1A are semicircular or shown in FIG. The compression coil spring 9 is provided in the recesses 5A and 5C, and the pedals 13 and 13A are attached via the pedal shaft 4 so that no load is applied to the pedal 13.

FIG. 12 is a diagram showing a state where a load exceeding a certain level has exceeded the pedal 13 of FIG. 11.
The compression coil spring 9 provided in the space 8 inside the member 1B is compressed by the action of the compression coil spring 9 when a load exceeding a certain level is applied to the pedal 13 below the member 1E. Unlike the state where no load is applied, the pedal 13A of the member 1E provided on the inner side of the member 1B of the pair of cranks 2 composed of the member 1B and the member 1E has a certain load or more. It is the crank 2 which has shown the state extended beyond.

FIG. 13 is an enlarged cross-sectional view of the crank 2 showing the B-B ′ direction of FIG. 6. 5 is a guide 14 for a recess, and 1D is provided with a hemispherical recess 5A provided with a compression coil spring 9 on the left and right sides, and on the left and right sides of the bottom of the U-shaped member 1 The compression coil spring 9 is provided with a projection 6B for preventing the drop, 5B is a 1D recess, and 1 is a member.

FIG. 14 is an enlarged cross-sectional view of the crank 2 showing the C-C ′ direction of FIG. 6. 1 and 1C are members, and 6A is a convex section of member 1C.

FIG. 15 is an enlarged cross-sectional view of the crank 2 showing the direction D-D ′ in FIG. 6. 1D is a member, 5A is a hemispherical recess 5A for providing the compression coil spring shown in FIG. 4, a guide course 14 of the recess 5 on the left and right side surfaces of 1 member, and a compression on the bottom A convex portion 6B for preventing the coil spring 9 from falling off is provided.

FIG. 16 is a side view showing a state where the crank 2 is attached to the crankshaft. The crank 2 is attached to the crankshaft 3 with bolts 12, the pedal shaft 4 is received with the pedals 13 with bolts 12 and 12A, 16 is a chain wheel, and a crank composed of 1B and 1E. The lower pedal 13A of FIG. 2 is depressed when traveling, and a load of a certain level or more is applied. The crank 2 is compressed by the action of the compression coil spring 9, and no load is applied to the upper pedal 13. It is a side view which shows the state.

FIG. 17 is a front view showing a state in which the crank 2 is attached to the crankshaft 3. The crank 2 composed of 1B and 1E is attached to the crankshaft 3 with the bolts 12 and the pedals 13 and 13A are attached to the pedal shaft 4 with the bolts 12 and 12A. When a certain load is applied to the pedal 13A that is depressed during traveling, the member 1E provided on the inner side of the member 1B is extended downward by the action of the compression coil spring 9, and the upper pedal 13 Thus, when no load is applied, the member 1E returns to the inside and is shortened by the action of the compression coil spring 9.
FIG. 18 is a diagram showing a hemispherical recess in FIG. 15 in a U-shape. The shape of the recess 5A for providing the compression coil spring 9 shown on the side surface in FIG. 4 is hemispherical, but the recess 5C in FIG. 18 has a slight frictional resistance with the compression coil spring 9 when the member 1E moves up and down. The concave portion 5C is provided in this shape in order to reduce it.

Currently, the tire size for a general passenger car is 26 to 27 inches. However, in the case of a size larger than this plan, if a crank is provided at the same crank ratio as before, it is further possible to Although the center of gravity of the body at the time of stopping increases and unstable elements increase, the unstable elements can be reduced by using flank that can move up and down.
By developing a larger bicycle, the running speed will naturally increase, and the time for commuting and attending school can be shortened, so an increase in demand can be expected.
In recent years, there are many people who are tall in general, and it will be possible to contribute to improving the willingness to develop large-sized bicycles such as 28, 29, and 30 in the future.

The top view which shows the inner side of the member 1 which comprises the member 1B by 1 and 1A. The top view which shows the inner side of the member 1A which comprises the member 1B with 1 and 1A. The top view which shows the member 1E comprised by 1C and 1D. The side view which shows the A-A 'direction of the member 1E of FIG. The top view which shows the time of insertion when providing the member 1E inside the member 1. FIG. FIG. 3 is a plan view in which a member 1E is inserted inside the member 1 and provided. The top view which shows the crank provided in pairs with the member 1B and the member 1E. The side view which shows the crank of the E-E 'direction of FIG. The top view which shows the crank which provided the pedal with the upper part in the crankshaft and the lower part. The side view of the crank which shows F-F 'direction of FIG. The side view of the crank which shows the G-G 'direction of FIG. The figure which shows the state in which the load more than fixed was exceeded to the pedal of FIG. The expanded sectional view of the crank which shows the B-B 'direction of FIG. The expanded sectional view of the crank which shows the C-C 'direction of FIG. The expanded sectional view of the crank which shows the D-D 'direction of FIG. The side view which shows the state which attached the crank to the crankshaft. The front view which shows the state which attached the crank to the crankshaft. The top view which shows having provided the hemispherical recessed part of FIG. 15 in the U-shape.

Parts 1, 1A, 1B, 1C, 1D, 1E
Crank 2
Crankshaft 3
Pedal shaft 4
Concave part 5, 5A, 5B, 5B
Convex 6,6A, 6B
Opening part 7, 7A, 7B
Space part 8
Compression coil spring 9
Hole 10, 10A, 10B
Cylindrical pin 11
Bolt 12,12A
Pedal 13, 13A
Guide lecture 14
Guide 15
Chain foil 16
Tire 17
Direction AA ′, BB ′, CC ′, DD ′, EE ′, FF ′, GG ′
H-H '

Claims (4)

A member 1E composed of a member 1C and a member 1D, and a member 1B composed of a member 1 and a member 1A are composed of a pair of cranks 2, and a space portion is formed inside the member 1B. 7, the member 1 </ b> E described above is provided on a pair of cranks 2 that can move up and down when a certain load is exceeded on the pedals 13 and 13 </ b> A by the action of the compression coil spring 9. Cranks. The member 1B provided with the opening 7 for attaching the crankshaft 3 to the upper part of the member 1B described above, the opening 7B for attaching the pedals 13 and 13A to the lower part, and the compression coil spring 9 on the inner side. And a guide course 14 for the concave portion 5 for inserting the above-described member 1A on the upper surface in the longitudinal direction, and a convex portion 6 for preventing the compression coil spring 9 from falling off at the lower portion. The bicycle crank according to claim 1, wherein the bicycle crank is provided. A hemispherical shape for providing compression coil springs 9 on the left and right side surfaces in the longitudinal direction of a member 1E configured by attaching the member 1C and the member 1D provided on the inner side of the member 1B described above with a cylindrical pin 11, or this character shape The crank for a bicycle according to claim 1 or 2, wherein the recesses 5A, 5C are provided. When the compression coil spring 9 of the crank 2 described above is broken, the member 1B is removed from the crankshaft 3, the member 1A constituting the member 1B is further removed from the upper direction, and the member 1C constituting the member 1E. The bicycle crank according to any one of claims 1 to 3, wherein the compression coil spring 9 can be replaced by removing the cylindrical pin 11 of the member 1D and pulling it in the HH 'direction.

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