CN112009613A - Telescopic crank device of bicycle - Google Patents

Abstract

A telescopic crank device of a bicycle can realize the operation control of a crank when the bicycle is ridden, can increase the foot treading moment by using the telescopic crank function when starting or climbing road conditions, and provides an elliptical telescopic crank track by using the hip bending and knee bending angle force application form which accords with human motion engineering, so that the force application area during treading circulation is the longest force arm, the non-force application area during entering the treading circulation is the shortest force arm, the fatigue and the loss of thigh physical strength and shank parts are further reduced, the riding can select a low-speed gear position of a chain speed changer, and a plurality of choices are provided, so that a great number of bicycle enthusiasts can more easily face a great amount of physical strength loads during starting or climbing; when the bicycle is ridden at high speed, on the premise of requiring high-speed pedaling frequency, the bicycle can be controlled to use the circular motion track of the shortest crank without parking adjustment and during riding, the large-span amplitude burden of the thigh and shank parts during high-speed riding is reduced, and the pedaling frequency rate is increased.

Description

Telescopic crank device of bicycle

Technical Field

The invention relates to a crank device of a bicycle, and provides the technical field of labor saving of moment increase of a force application section when the bicycle is ridden, in particular to a telescopic crank device which is used as a technical means for driving the bicycle to move forwards by providing the maximum moment with the minimum treading circulation track.

Background

Referring to fig. 16, a fixed crank device of a conventional bicycle is provided, in which a pedal crank is in a full-circle equal-length operation form in order to circulate the pedaling kinetic energy of a bicycle rider in a circular form and to give the kinetic energy in a forward pedaling as a force application section; however, as the length of the crank is lengthened, the amplitude of the circular riding motion of the legs and feet of the rider is synchronously increased, the physical strength during riding is also loaded, and the large-circle posture of the crank makes the rider more fatiguable, so the length of the crank is generally measured by the length of the legs and feet of the rider, and the concept defines the riding of the crank of the bicycle for more than two hundred years.

For example, the Chinese patent authorization publication number: CN 208181335U, and CN 201187563Y, both of which are telescopic cranks, and rely on eccentric cam slot plates arranged at the middle shaft to operate the telescopic function of the cranks.

For example, the Chinese patent authorization publication number: CN 102099245 a is a korean application that realizes the lift and return of the telescopic crank by using a bevel gear linked with pedals to drive the angle change of the crank during stepping.

Such as japanese patent No. (JP) grant bulletin number: japanese patent laid-open No. 5-155375 discloses a telescopic crank which is realized by utilizing multiple connecting rods and arranging a middle shaft cam groove.

The related creations which are disclosed at present and the creations of the above-mentioned exemplified utility model or invention mostly realize the extension and contraction function by a middle shaft cam groove, wherein the inventions of the exemplified korean gear transmission for extending and contracting the crank are the only creations which do not use the middle shaft cam groove; however, the related inventions disclosed in the prior art have a burden feeling, for example, a large cam groove disc is arranged at the middle shaft to link the telescopic cranks, which seems to be a simple structure, but the overall visual beauty of the bicycle seems to be a shadow, and whether the friction resistance increased by the whole cycle of the left and right cranks can offset the effective moment increased by extending the moment arm while providing the telescopic cranks to make a labor-saving structure is a subject, which deserves deep thinking and discussion to solve the difficulties faced by billions of riders in the world.

Disclosure of Invention

The technical problem to be solved by the invention is as follows:

the architecture of the pedal crank sold on the market is shown in fig. 16N1, and the applied principle architecture is far from the old, and there is no change, which shows that the simplest design is the most beautiful, the most light and the most efficient application; however, the application of the bicycle rider is deeply felt from the practical application and practice and cannot meet the requirements of the bicycle rider, such as a rider who has sports fitness people, a worker who has commuters, a seeker who visits famous mountains and great rivers, a housewife who is busy in daily life, and rushes between the market and two places of a family, or a peduncle who rides and carries the bicycle; most of the existing bicycles are provided with a speed change device to provide fast and efficient riding, which solves the problems of most people, but the invention still can see the lusterless feeling of the bicycle rider when climbing a slope or being under load, which is a great problem to be solved by the invention.

The crank telescopic mechanism is designed with 182 optional use or without using the function of the telescopic crank, so that the crank telescopic function can be made according to the current requirement to achieve the labor-saving purpose of starting acceleration or climbing road conditions, or the crank telescopic mechanism can be simply controlled and converted into the shortest force arm without the function of the telescopic crank by a rider during high-speed riding without increasing the long-term extrusion of the patella of the leg of the rider on the femur, so as to improve and maintain the frequency of accelerated treading, and the rider can safely and healthily ride at proper hip bending and knee bending angles;

to achieve the above purpose, the relative angle relation application when the pedal is applied by the foot bottom when the pedal is treaded by the rider is simply quoted; during riding, as shown in fig. 16N1 and N2, when the pedal is applied to the force application area 16 by the front part of the sole of the foot, the contact surface between the bottom of the rider's foot and the pedal can be regarded as a circular loop running at a fixed angle and approximately parallel to the ground, and the circular loop is an effective work application area; when the bicycle enters the non-force-application interval 16-1, the bicycle has a forward inclination angle X, the forward inclination angle is adjusted according to the leg length of a person and the height of a bicycle cushion, and the posture and the force state during riding are different, and the part is a non-work-applying area, and if special riding shoes are worn, the bicycle can be called a micro-work-applying area by using the leg lifting tension; the invention is explained aiming at the practical application of a common bicycle in the effective force application working area of the force application area 16; the contact surface between the foot bottom of the rider and the pedal is taken as a normal endpoint of being in a fixed angle and being approximately parallel to the ground, when the telescopic crank is arranged in the pedal advancing cycle, the conversion of the relative included angle between the pedal in parallel and the rotation of the crank is promoted to make the telescopic conversion of the crank, and the long arm crank which is extended in the force application interval 16 is realized through the telescopic conversion of the crank, so that the rider obtains large torque to drive the bicycle; the short arm crank is shortened when entering the non-force-application interval 16-1, so that the rider can still obtain the minimum leg loop circulation to reduce the fatigue of the leg joints and muscles.

The technical scheme of the invention is as follows:

the invention is a bicycle telescopic crank device, wherein the crank has telescopic function, in the effective force application interval 16, it has the function of increasing to the longest force arm with the angle change, in the non-force application interval 16-1, it has the function of decreasing to the shortest force arm; the telescopic crank device can smoothly accord with the principle of human engineering, and provides the longest crank force arm with labor saving when a rider tramples on the effective force application interval 16, so as to improve the force application torque and ensure that the rider feels comfortable during riding; when the user steps on the pedal to the non-force-application interval 16-1, the crank arm is shortest, and the fatigue is reduced by the ineffective action of the crus and feet (the above indication of the effective force-application interval 16, please refer to fig. 16N 2).

The arrangement shows that the pedals of the bicycle are trampled by the soles of a rider, the pedals are considered to be in parallel contact with the soles of the rider, and the pedals parallel to the ground and the crank which rotates in 360 degrees in a circulating way are considered to generate different included angles when the pedals and the ground are considered to be nearly parallel on the premise that the pedals and the ground are in annular running of the pedals of the bicycle which is trampled by the soles of the rider.

Further, as shown in fig. 1-3, a cam disk 4 is used to be mounted on the pedal 1, so that the cam disk 4 is associated with the pedal 1 at a fixed angle, when different included angles are generated between the pedal 1 parallel to the ground and a crank revolving in 360 degrees in a circulating manner due to treading and force application by a foot, the same thing is that the cam disk 4 and the crank revolving in 360 degrees in a circulating manner generate different included angles, at this time, the cam disk 4 coaxial with the pedal 1 is mounted on the telescopic crank 3, and the cam disk 4 and a follower roller 2-4 of the fixed crank 2 running on a cam groove inner concave ring 4-6 of the cam disk 4 have the size and shape following the cam groove inner concave ring 4-6, so that the telescopic crank 3 expands and contracts in a relative position angle, and the function purpose of the telescopic crank is achieved.

Furthermore, as shown in fig. 4 to 6, in order to follow the principle of [0013], the cam disc 4 is replaced by a dual link transmission mode with a smaller volume, the parallel link 10 is fixed to the pedal a7 to make the two generate a certain parallel angle, the rotating link 11 is associated with the rotating shafts of the parallel link 10 and the fixed crank A8 to make the parallel link 10 and the rotating link 11 interlocked with the pedal a7, and the telescopic offset of the link type telescopic crank 9 is the added or subtracted value of the spindle hole distances of the rotating link 11 and the parallel link 10 due to the relationship of the radius difference between the rotating link 11 and the parallel link 10, so as to form the telescopic distance length of the link type telescopic crank 9 during 360-degree cyclic rotation, according to the present embodiment: the crank length of the pedal is extended from the original 165mm crank length to 208.5mm crank length, and the effective treading torque can be improved within 26%.

Preferably, the present invention considers that the rider needs to raise the riding torque by using the telescopic crank of [0013] or [0014] when the rider needs or intends to make a high-speed pedaling frequency requirement according to various road conditions, and when the requirement is temporarily absent (such as after starting up, or getting off a slope road surface, or starting high-speed riding), the rider can make a selection, that is, the function of the connecting rod type telescopic crank 9 can be controlled to close, so that the crank device is kept in the form of the shortest arm of force, and accordingly, pedaling frequency maintenance during high-speed riding is sought, the riding speed is increased, and high-speed riding is maintained.

As described in the above [0015] embodiment, please refer to fig. 10, which is a controllable crank device having a sliding sleeve outer ring 14-1 and an unlocking member 15, when the inner side of the foot touches and continuously presses the sliding sleeve outer ring 14-1 at any time, the position is instantly switched to a non-telescopic crank configuration at 270 degrees (as shown in fig. 7 or fig. 16N2), and then the foot can release the sliding sleeve outer ring 14-1 and does not give any reason, and the shortest configuration that the crank is not telescopic is always maintained, so as to effectively increase the pedaling frequency with the minimum movement cycle of the leg and foot portion, and reduce the fatigue degree of the leg and foot portion movement caused by too large loop when pedaling at high speed; when the rider determines that the rider needs to increase the pedaling torque by using the telescopic long crank to reduce the physical load when the rider encounters a ramp road condition in the riding process, at the moment, when the rider touches and continuously presses the unlocking piece 15 at any time point by the outer side of the foot, the telescopic crank form can be instantly switched to be the telescopic crank form at the 270-degree position, and then the unlocking piece 15 can be released by the foot part and is not considered any more, and the crank telescopic labor-saving form can be kept all the time.

Most preferably, the present invention provides a telescopic crank device for a bicycle, which can be selectively operated according to the above [0016] embodiment, providing a mode of application for the bicycle rider to pay attention to the knee health, achieving each journey with minimal physical strength and hip and knee bending angle loads, and meeting the goal of green travel with another type of health application more in accordance with ergonomics under the multi-gear speed-changing labor-saving model of the present bicycle, so as to assist the rider to enjoy delicate and healthy life.

The invention has the beneficial effects that:

the telescopic crank device provided by the creation is the most effective solution for taking into account the high-speed pedaling frequency requirement of the existing high-speed riding and causing fatigue feeling when facing the road condition of long climbing.

Drawings

To more clearly illustrate the technical aspects of the embodiments of the present invention, the drawings are specifically described and a brief description is made, which will be clearly understood by those skilled in the art.

Fig. 1 is a schematic view of a telescopic crank cam plate device of a bicycle according to the present invention.

FIG. A: the front view of cam disk type torque-increasable crank of bicycle and the trace diagram of pedal running of torque increasable are shown.

And B: is a cam disk type torque-increasable crank three-dimensional view of the bicycle.

Fig. 2 is a drawing of the left foot crank unilateral assembly of the telescopic crank cam plate device of the bicycle of the present invention.

And (C) figure: is a top view and a front view of a cam plate type moment increasable crank assembly.

FIG. D: is a cam disk type left foot unilateral crank three-dimensional view capable of increasing moment.

Fig. 3 is an exploded view of the components of the telescopic crank and cam plate device of the bicycle of the present invention.

Fig. D1: is an exploded view of a left foot unilateral crank member of a cam disk type moment increasable crank assembly.

Fig. D2: a detailed diagram of a cam plate architecture for a cam plate type moment increasable crank assembly.

Fig. 4 is a perspective view of the telescopic crank link device of the bicycle of the present invention.

Fig. 5 is a schematic view of the moment increasable crank assembly of the telescopic crank link type device of the bicycle of the present invention.

FIG. E: the application diagram of the connecting rod type increasable torque crank component is that the increasable length is increased from the original length of 165mm to 208.5mm along the increment of the connecting rod type increasable torque, and the torque length can be increased by 26 percent;

when the distance Y between the shaft holes of the parallel connecting rods and the distance Z between the shaft holes of the rotating connecting rods are at the 270-degree marked positions, the distance is 165mm after the distance Z-Y is subtracted from the distance Z of the pedal spindle;

when the distance Y between the shaft holes of the parallel connecting rods and the distance Z between the shaft holes of the rotating connecting rods are at the 90-degree marked positions, the sum of Z + Y of the pedal spindle is 208.5 mm;

FIG. F: the right foot unilateral component of the connecting rod type moment-increasable crank component is a crank extension generated by adding Z + Y between the shaft hole distance Y of the parallel connecting rod and the shaft hole distance Z of the rotating connecting rod.

Fig. 6 is an exploded view of the components of the telescopic crank link device of the bicycle of the present invention.

Fig. F1: is an explosion diagram of the right foot single-side component of the connecting rod type crank component with moment increasable.

Fig. F2: is an explosion diagram of the right foot unilateral component member of another view angle of the connecting rod type moment-increasable crank component.

FIG. 7 is a controllable telescopic crank linkage of the bicycle of the present invention, having a function of track motion crank operation with selectable torque increase or torque no increase; the pedal can be operated by selecting a track with a radius of 165mm as shown in the embodiment; or the pedal is operated by a track with the longest force application interval of 208.5mm and capable of increasing torque during forward riding.

Fig. 8 is a perspective crank assembly drawing of the controllable telescopic crank link device of the bicycle of the present invention.

Fig. 9 is a perspective view of the controllable telescopic crank link device of the bicycle of the present invention.

Fig. 10 illustrates a method for pedal control of the controllable telescopic crank linkage of the bicycle of the present invention.

FIG. 11 is an exploded perspective view of the left foot crank unilateral component of the bicycle controuably telescoping crank linkage of the present invention.

Fig. 12 is an exploded view of the invention from another perspective of fig. 11.

FIG. 13 is a cross sectional view of the left foot crank assembly of the bicycle crank linkage assembly of the present invention.

FIG. 14 is a side cross sectional view of the right foot crank assembly of the bicycle controuably telescoping crank linkage of the present invention.

Fig. G1: the diagram of the front connecting rod is locked for the operation upper view component of the connecting rod type moment-free crank component.

Fig. G2: the drawing is a drawing for locking the rear connecting rod for the operation upper view component of the connecting rod type moment-free crank component.

Fig. G3: a diagram of the locking of the connecting rod for the operating inner member of a connecting rod type moment-free crank assembly.

Fig. G4: the inner member of the link-type moment-increasable crank assembly is manipulated to restore the link member diagram.

Fig. G5: a drawing (see fig. 15H1, H2) of a center rod detent 13-6 of a linked non-moment crank assembly for a bicycle before it is latched, and resiliently inserted into a crank differential slot 9-4 or 9-5.

Fig. G6: the locking of the center rod detent 13-6, which is a linked non-moment-adding crank assembly for a bicycle, disengages the center rod detent 13-6 from the pattern of detent grooves 12-11 of pedal B12 after being resiliently inserted into the crank differential groove 9-4 or 9-5.

Fig. 15 is a detailed illustration of the bicycle telescopic crank assembly of the present invention.

Fig. H1: the detailed diagram of the operation and control on the left foot side is the detailed diagram of the differential groove when the pedal rotates to 270 degrees.

Fig. H2: the detailed diagram of the operation on the "right" foot side is the detailed diagram of the differential groove when the pedal rotates to 270 degrees.

FIG. I: the torque-increasing crank operating feature allows the torque-increasing function to be used when the rider applies force to the "out" side of the release 15 at any point in time.

Fig. L1: is a component diagram of an anti-rotation female joint 10-1 with inner holes 18-36 sides.

Fig. L2: an internal tooth type anti-rotation female joint 10-1 with 18-45 teeth.

Fig. J1: the illustrated situation is the operating mode of the moment increasable crank.

Fig. J2: to operate the detail components of the torque-free crank, the rider applies force to the "inboard" side of the sleeve outer ring 14-1 at any point in time, entering the torque-free ready mode (see fig. 10).

Fig. J3: to operate the detail components of the no torque crank, the no torque increase mode is entered completely when the pedals are rotated to 270 degrees after the rider operates J2.

FIG. 16 shows a typical pedal and crank combination that is commercially available.

Fig. N1: when riding, the pedal is parallel to the ground.

Fig. N2: the effective pedal force application interval angle of the pedal and the crank of the bicycle defines a schematic diagram.

The component number designations of the drawings are explained in further detail:

r horizontal trajectory central axis. Indicated in FIG. 1:

and an S + 20-degree horizontal track central axis. Indicated in FIG. 1:

a horizontal trajectory central axis of T-20 degrees. Indicated in FIG. 1:

the X pedal inclines forward. Indicated in FIG. 16:

the pitch of the axial holes of the Y "" parallel links "" or "" dual function parallel links "".

Indicated in FIG. 5: and the shaft hole pitch of FIGS. 15L1 and 15L2,

the center-to-center spacing of the member 10-1 and the member 10-4.

Z shaft hole pitch of the "rotating link" or the "dual function rotating link".

Indicated in FIG. 5: the shaft hole interval of (1) is the center interval between the component 11-1 and the component 11-3.

1, pedaling. 1-1 step mandrel.

1-2 spindle bidirectional screw. 1-3 pedal spindle inside ball.

1-4 pedal outside spindle balls. 1-5 spindle outside locking screw.

1-6 reverse-tooth anti-loosening screws. 1-7 elastic linkage pins.

1-7a pedal and cam plate linkage pin. 1-7b linkage pin spring guide post.

1-8 linkage pin springs. 1-9 baffles.

1-9a guide post spring rear baffle hole. 1-9b baffle lateral limit screw hole.

1-10 baffle grooves. 1-11 baffle screw holes.

1-12 linkage pin limiting holes. 1-13 baffle plate screws.

2 the crank is fixed. 2-1 follow-up wheel axle center.

2-2, fixing screws behind the follow-up wheel shafts (so that balls on two sides of the axes of the follow-up wheels roll freely).

2-3 follow-up wheel ball.

2-4 follow-up rollers (in rolling contact with the concave rings 4-6 in the cam plate groove).

2-5, fixing the head of the crank (in a left foot shape, connecting the right foot with the fluted disc, wherein each brand is in different shapes).

2-6 a square shaft for fixing the axle center of the crank linked bicycle.

2-7 follow-up axle hole.

3 a telescopic crank. 3-1 limiting the roller axle center hole.

3-2, treading and rotating the center hole. 3-3 screw abdicating grooves of the follower wheels.

4 cam disks, (cam disks with offset central holes).

4-1 cam groove inner ring surface. 4-2 outer ring surface of cam groove.

4-3 linkage pin angle adjusting holes.

4-31 are linked with pin angle adjusting holes. 4-32 lower linkage pin angle adjusting holes.

4-4 central hole of cam plate. 4-5 ball running rings.

4-6 cam groove inner concave ring. 4-7 cam ball.

And 5, limiting the roller. 5-1 limiting the axes of the rollers.

5-2 limiting roller axis fixing screws. 5-3 limiting roller balls.

6 anti-skid spring strips.

And 7, pedaling the pedal A. 7-1 the fixed mandrel is pedaled.

7-2 hexagonal fixed anti-rotation screw heads. 7-3 rotating the spindle.

7-4 polygonal anti-rotation male connectors; (the male connector is arranged in an 18-36-sided shape,

or an external-tooth type male joint with 18-45 teeth of the gear to mate with the member 10-1).

7-5 rotating the spindle balls. 7-6 parallel connecting rod side telescopic crank ball.

7-7 hexagonal fixed anti-rotation grooves. 7-8, pedal the screw outside the fixed mandrel.

8 fix the crank a.

The 8-1 connecting rod rotationally fixes the guide post. 8-2 the connecting rod rotates to fix the screw abdicating hole.

9 connecting rod type telescopic crank. 9-1 limiting the roller shaft hole.

9-2 of axial center holes. 9-3 connecting rod guide pillar abdicating groove

9-4 left foot crank differential groove. 9-5 right foot crank differential groove.

9-6 crank differential slots; (including a left foot crank differential groove 9-4 and a right foot crank differential groove 9-5).

10 parallel links.

10-1 polygonal anti-rotation female joint; (set to be 18 sides-36 sides or 18 teeth-45 teeth of gear

To mate with member 7-4 or 12-4).

10-2 parallel link set screws. 10-3 double-link movable ball.

10-4 double-connecting-rod movable column. 10-5 double-function parallel connecting rods.

10-6 parallel link nuts. 10-7 are parallel to the side plane of the connecting rod.

11 rotate the connecting rod.

11-1 rotating the connecting rod guide post. 11-2 self-lubricating bearing.

11-3 outer connecting rod movable column linkage holes. 11-4 movable ball of external connecting rod.

11-5 ball screw cap. 11-6 connecting rod guide post screws.

11-7 double-function rotating connecting rod. 11-8 central rod locking steel balls.

11-9 lock the steel ball spring. 11-10 locking steel ball screws.

11-11 center rod capture holes. 11-12 circular ring type planes.

And (5) pedaling the pedal B12. 12-1 pedal the rotating spindle.

12-2 hexagonal slide axis. 12-3 mandrel.

12-4 polygonal male connectors; (the male connector is arranged in an 18-36-sided shape,

or an external-tooth type male joint with 18-45 teeth of the gear to mate with the member 10-1).

12-5 the external thread is blocked. 12-6 center the rod hole.

12-7 spindle outer locking screw. 12-8 foot pedal B rotates the outboard ball.

12-9 pedals B rotate, and the inner side balls 12-10 slide sleeve holes.

12-11 braking grooves. 12-12 outside the spindle.

12-13 inside the spindle. 12-14 unlocking member positions the rotary slot.

12-15 braking the sliding groove. 12-16 braking the front ring of the groove.

13 the switching lever is centrally positioned.

13-1 positioning rod limiting section difference. 13-2 the positioning rod is locked.

13-3 the positioning rod is connected with a thread. 13-4 positioning the rod limiter.

13-5 unlocking the coupling. 13-6 center rod detent.

13-7 difference front end. 13-8 brake the center spring.

14 sliding sleeve. 14-1 sliding sleeve outer ring.

14-2 sliding sleeve spring leaf. 14-3 spring leaf mounting screws.

15 unlocking the lock. 15-1 unlocking the spring plate.

15-2 spring leaf fixing screws. 15-3 unlocking member positions the swivel arm.

16 pedal force application intervals. 16-1 non-force application interval.

17 frame. 17-1 wheel.

18 central axis. 18-1 fluted disc.

19 ground.

20 crank runs a minimum radius.

21 crank runs the maximum radius.

22 crank telescoping travel path.

Left and right pedals 23 (including pedal 1, pedal A7, and pedal B12).

And 24 left and right fixed cranks (including the fixed crank 2 and the fixed crank 8).

And 25, left and right telescopic cranks (comprising a telescopic crank 3 and a connecting rod type telescopic crank 9).

Detailed Description

A telescopic crank device of a bicycle can realize that a longer crank force arm is provided when a pedal rotates to an effective force application area 16 during riding, so as to promote the pedaling moment and assist in overcoming the physical force consumption riding environmental conditions during pedal starting and uphill road sections; and when the force is not applied in the interval 16-1, the crank arm of force with the shortest length is provided, so that the riding is more light and comfortable;

a: the first embodiment of the present invention, as shown in fig. 1, 2 and 3, is:

a telescopic crank cam disc device of a bicycle comprises a pedal 1, a fixed crank 2, a telescopic crank 3, a cam disc 4 with a central hole offset type characteristic and the like;

the principle is as follows: in order to apply the contact between the sole of a rider and the pedal 1 and receive the continuous force applied by the sole of the rider, the pedal 1 is given an angle reference which is the same as the force applied joint part of the sole of the rider, the pedal 1 is connected with the cam disc 4 through the elastic linkage pins 1-7 by the angle reference (the pedal force application interval 16 is regarded as a ring running circulation which is at a fixed angle and is approximately parallel to the ground), the cam disc 4 rotating along with the fixed crank 2 is kept to be approximately parallel to the ground in the same level in the process of the rotary treading forward of the rider, the follower rollers 2-4 on the fixed crank 2 are contacted and rolled in the concave ring 4-6 in the cam groove of the cam disc 4, so that the follower rollers 2-4 are limited by the inner ring surface 4-1 of the cam groove and the outer ring surface 4-2 of the cam groove, the telescopic crank 3 which can slide on the fixed crank 2 in radial direction under the limit of the limit roller 5 is connected with the cam disc central hole 4-4 with the characteristic of central hole offset pattern, when the telescopic crank 3 rotates, the telescopic crank 3 follows the cam groove inner concave ring 4-6 of the cam disc 4 to make telescopic reaction due to the regular change of the central hole offset distance between the following roller 2-4 and the cam disc central hole 4-4.

B: the second embodiment of the present invention, as shown in fig. 4, 5 and 6, is:

a double-link device of telescopic crank of bicycle comprises a pedal A7, a fixed crank A8, a link type telescopic crank 9, a parallel link 10, a rotary link 11 and the like;

the principle is as follows: in order to apply the contact between the sole of a rider and a foot pedal A7, receive the continuous force applied from the sole of the rider, give the pedal A7 an angular reference identical to the force applied from the sole of the rider, and through the angular reference (the ring operation cycle which is regarded as a fixed angle and approximately parallel to the ground within the pedal force application section 16), the pedal A7 is linked to the parallel link 10 through the polygonal anti-rotation male joint 7-4 of the pedal fixed spindle 7-1, and during the forward rotary pedaling of the rider, the parallel link 10 rotating with the fixed crank A8 is maintained at an angle approximately parallel to the ground, and through the link rotation fixing guide 8-1 on the fixed crank A8 passing through the link guide abdicating groove 9-3, the rotary link guide 11-1 rotating the rotary link 11 is forced to interlock with the outer link moving guide hole 11-3 due to the restriction of the rotary link guide 11-1 and the outer link moving guide hole 11-3, under the condition that the parallel connecting rod 10 is parallel to the ground, when the rotating connecting rod 11 rotates around the double connecting rod movable post 10-4 of the parallel connecting rod 10 to form a fixed crank A8 to rotate to 90 degrees (the position interval is marked with figure 1), the distance between the pedal fixed spindle 7-1 and the connecting rod rotating fixed guide post 8-1 is the sum of the shaft hole distances of the parallel connecting rod 10 and the rotating connecting rod 11, when the fixed crank A8 rotates to 270 degrees, the shaft hole distance between the parallel connecting rod 10 and the rotating connecting rod 11 is subtracted, wherein the shaft hole distance between the central hole axis of the polygonal anti-rotation female joint 10-1 of the parallel connecting rod 10 and the shaft center line of the double connecting rod movable post 10-4 is Y, the shaft hole distance between the outer connecting rod movable post linking hole 11-3 of the rotating connecting rod 11 and the rotating connecting rod guide post 11-1 is Z, when the shaft hole distance between the parallel connecting rod 10Y and the rotating connecting rod 11 is Z at the 270 degrees marked position, the value of the pedal spindle after subtraction of "Z" - "Y" - "is 165 mm; when the distance "Y" between the axial holes of the parallel link 10 and the distance "Z" between the axial holes of the rotating link 11 are at the 90-degree mark position, the sum of "Z" + "Y" of the pedal spindle is 208.5mm (as illustrated in fig. 5E of [0025 ]), so that the link type telescopic crank 9 is free to slide in the radial direction of the fixed crank A8 under the restriction of the limit roller 5, and when the rider rotates and steps forward, the link type telescopic crank 9 responds to the length expansion change due to the regular change of the distance between the axial holes of the parallel link 10 and the rotating link 11 because the axial hole 9-2 of the link type telescopic crank 9 is coupled to the rotatable axial center of the rotating spindle 7-3 of the pedal fixed spindle 7-1.

C: the third embodiment of the present invention, including fig. 7 to 15, please refer to fig. 11 to 14, which are:

a controllable double-link device of a telescopic crank of a bicycle comprises a pedal B12, a fixed crank A8, a link type telescopic crank 9, a dual-function parallel link 10-5, a dual-function rotating link 11-7, a sliding sleeve 14, an unlocking piece 15 and the like;

the principle is as follows: in order to apply the contact between the sole of the rider and the foot pedal B12, receive the continuous force applied from the sole of the rider, give the pedal B12 an angle reference identical to the force applying part of the sole of the rider, and by this angle reference, make the pedal B12 generate an approximately parallel connection angle with the dual-function parallel connecting rod 10-5 through the polygonal male joint 12-4 of the pedal rotating spindle 12-1, and in the process of the rider's rotary pedaling forward, make the dual-function parallel connecting rod 10-5 rotating with the fixed crank A8 maintain the same angle relation with the ground, through the connecting rod rotating fixed guide post 8-1 on the fixed crank A8 (this component is marked with reference to FIG. 6F1), the rotating connecting rod guide post 11-1 of the dual-function rotating connecting rod 11-7 is rotated and applied force to the rotating connecting rod guide post 11-1, so that the dual-function rotating connecting rod 11-7 is restricted by the rotating connecting rod guide post 11-1 and the outer connecting rod moving post, under the condition that the dual-function parallel connecting rod 10-5 is approximately parallel to the ground, the dual-function rotating connecting rod 11-7 rotates around the dual-connecting rod movable column 10-4 of the dual-function parallel connecting rod 10-5 to form a position (the position interval is marked with figure 7) when the fixed crank A8 rotates to 90 degrees, the distance between the pedal rotating mandrel 12-1 and the connecting rod rotating fixed guide column 8-1 is the sum of the distance between the dual-function parallel connecting rod 10-5 and the shaft hole of the dual-function rotating connecting rod 11-7, the distance between the dual-function parallel connecting rod 10-5 and the shaft hole of the dual-function rotating connecting rod 11-7 is subtracted when the fixed crank A8 rotates to 270 degrees, wherein the distance between the central hole axis of the polygonal anti-rotation female joint 10-1 of the dual-function parallel connecting rod 10-5 and the shaft hole of the shaft central line of, wherein, the distance between the linkage hole 11-3 of the outer connecting rod movable column of the dual-function rotating connecting rod 11-7 and the shaft hole of the rotating connecting rod guide column 11-1 is Z, wherein when the distance between the shaft holes Y of the dual-function parallel connecting rod 0-5 and the distance between the shaft holes Z of the dual-function rotating connecting rod 11-7 are at the 270-degree marked position, the subtraction value of Z-Y of the pedal mandrel is 165 mm; when the axial hole distance "Y" of the dual-function parallel link 10-5 and the axial hole distance "Z" of the dual-function rotating link 11-7 are at the 90-degree mark position, the added value of "Z" + "Y" of the pedal spindle is 208.5mm (as illustrated in fig. 5E of [0025 ]), so that the link type telescopic crank 9 can freely slide in the radial direction of the fixed crank A8 under the restriction of the limit roller 5, and when the rider rotates and steps on the front, the link type telescopic crank 9 makes a telescopic change of length due to the regular change of the distance between the axial holes of the dual-function parallel link 10-5 and the dual-function rotating link 11-7.

In addition, the function of the controllable telescopic crank is shown in fig. 10-15, that is, the inner side of the foot touches and temporarily keeps pressing until the closing function response of 270 degrees position; as shown in FIGS. 10 and 12, the sliding sleeve spring strips 14-2 are driven when touching the sliding sleeve outer ring 14-1; turning to fig. 13-14, it is explained that the sliding sleeve 14 is pulled out elastically, and the central rod braking member 13-6 is pushed along with the sliding sleeve, at this time, the differential front end 13-7 touches the link type telescopic crank 9 until the pedal B12 rotates to about 270 degrees, and the differential front end 13-7 of the central rod braking member 13-6 makes an elastic nesting action with the left foot crank differential slot 9-4 or the right foot crank differential slot 9-5 shown in fig. 15H1 and H2, so as to synchronously disengage the central rod braking member 13-6 from the braking slot 12-11 of the pedal B12 (as shown in fig. 12), and synchronously rapidly nest the central positioning switching rod 13 with the central rod locking hole 11-11 of the dual-function rotating link 11-7 under the elastic thrust of the braking central spring 13-8; wherein, the center rod braking part 13-6 is separated from the braking groove 12-11 (as shown in fig. 14G 6), in order to make the pedal B12 and the dual-function parallel link 10-5 lose the linkage, the pedal B12 is only treaded on the pedal rotating spindle 12-1 to apply a rotating force; the central positioning switching rod 13 is fast sleeved with the central rod locking hole 11-11, so as to enable the dual-function parallel connecting rod 10-5 and the dual-function rotating connecting rod 11-7 to be locked into a whole, so that the connecting rod type telescopic crank 9 is in the shortest force arm state, and becomes an application state of controllably closing the telescopic function of the crank.

In addition, the operation of the telescopic function of the return crank, that is, the outer side of the foot touches and temporarily keeps pressing the opening function response to the 270 degree position, as shown in fig. 10 and fig. 15I, when the unlocking piece 15 is touched, the pedal B12 rotates to about 270 degrees through the buffering of the unlocking spring piece 15-1; turning to fig. 13 and 14G4, the center lever detent 13-6 receives the elastic pressing type variable force from the unlocking spring plate 15-1 and the detent center spring 13-8, so that the center lever detent 13-6 is pressed into the detent groove 12-11 of the pedal B12, and the synchronous center positioning switch lever 13 is synchronously retracted to the position of the dual function parallel link 10-5 which does not interfere with the dual function rotation link 11-7; wherein, after the braking part 13-6 of the central rod is pressed into the braking groove 12-11, the pedal B12 and the dual-function parallel connecting rod 10-5 are restored to be linked; the above-mentioned position where the center positioning switching rod 13 is synchronously retracted into the position of the dual-function parallel connecting rod 10-5 which does not interfere with the dual-function rotating connecting rod 11-7 is to open the rotating function of the dual-function rotating connecting rod 11-7, so that the connecting rod type telescopic crank 9 becomes a controllable application with the crank telescopic function again.

D: as described above, fig. 1: a is described in [0064 ]: first embodiment, and as shown in fig. 4: b is described in [0064 ]: the second embodiment is that the normal state has the function of the telescopic crank, which can make the telescopic crank move along the central elliptical track of the crank telescopic moving track 22, and realize that the pedal is at the shortest position of 165mm when in the 270 degree position, the length of the telescopic crank is 182mm when in the 0 degree and 180 degree positions, and the length of the telescopic crank is 208.5mm when in the 90 degree position; the change in length of the telescopic crank is used to obtain a stepping torque which can be increased by at most 26%.

E: the above description [0064] describes C: as shown in fig. 7: the third embodiment is that, the following embodiments can be selected at any time: the complete function of the second embodiment, or the optional switching off of its telescopic function at any time, is the circular path of the smallest radius 20 of crank travel for the purely shortest crank moment arm 165 mm.

F: in the above A, B, C embodiments, all the above operations can be performed by adjusting A: a linkage pin angle adjusting hole 4-3 of the cam disc 4 and a polygonal anti-rotation female joint 10-1 of the adjusting parallel connecting rod 10 of the B or the dual-function parallel connecting rod 10-5 of the C are used for changing the up-and-down offset angle of the longest telescopic position of the crank when the 90-degree position is changed.

The invention relates to a telescopic crank cam disc device of a bicycle, please refer to fig. 1-3, the invention provides a cam disc 4 with a center hole offset pattern characteristic, the distance difference of a cam groove inner concave ring 4-6 and a cam disc center hole 4-4 of the center hole offset is utilized to drive a follow-up roller 2-4, when the cam disc 4 is fixed with a pedal 1 to rotate, a pedal spindle 1-1 makes a relative position change along the cam groove inner concave ring 4-6 as the follow-up roller 2-4 runs in the cam groove inner concave ring 4-6 (see paragraph A of [0064 ]); the framework rotationally operates as shown in fig. 1-2, wherein the fixed crank 2 is connected with a middle shaft 18, and the middle shaft 18 is limited to rotate in the frame 17;

the following description refers to fig. 1, 2 and 3 for the purpose of promoting an understanding of the architecture of the present invention;

a: as shown in fig. 13k-k, the two sides of the fixed crank 2 are inserted into the mounting holes of the two sides of the fixed crank, and the application function of the anti-slip spring 6 is to prevent the pedal 1 from keeping its original posture when not riding or when the front sole of the foot of the rider leaves the pedal 1 for a short time, so that the pedal 1 does not shift up and down at will due to gravity, which affects the action of re-righting the pedal 1 and the waste of adjustment time when riding subsequently;

b: the inner side of the fixed crank 2 is assembled with a freely sliding telescopic crank 3, the two parts limit the sliding direction of the telescopic crank 3 in the form of a cylindrical groove of a limiting roller 5 and only allow the free sliding in the radial direction of the length of the fixed crank 2, wherein, two sides of the limit roller 5 are respectively provided with a group of limit roller balls 5-3 arranged on the limit roller, the center of the limit roller 5 penetrates into the axis 5-1 of the limit roller and enters the center hole of the limit roller, then the roller is penetrated into a position 3-1 of a shaft center hole of a limit roller, and a screw 5-2 for fixing the shaft center of the limit roller locks the shaft center 5-1 of the limit roller by screw threads, at the moment, the limit roller 5 is provided with two groups of limit roller balls 5-3 in a ball bearing shape, therefore, when the telescopic crank 3 moves radially along the length of the fixed crank 2, the telescopic crank can be regarded as rolling sliding without friction force; when the limiting roller 5 rolls and slides, a small interference force is generated with the anti-skidding spring strip 6, the interference force is generated by the limiting roller 5 rolling and pressing the anti-skidding spring strip 6, one side of the interference force is boosted along with the rolling of the limiting roller 5, the other side of the interference force is reduced in pressure, so that a rider does not need too much physical force due to the interference force, and the rider does not disturb the position of the pedal 1 due to gravity caused by temporary parking;

c: taking a ball 2-3 of the follower wheel and sticking butter on a shaft hole 2-7 of the follower wheel of the fixed crank 2, arranging the ball on two sides of the shaft hole 2-7 of the follower wheel, penetrating the shaft 2-1 of the follower wheel, locking the ball in a screw abdicating groove 3-3 of the follower wheel at the other end by a fixing screw 2-2 behind the shaft of the follower wheel, and enabling the shaft 2-1 of the follower wheel to freely rotate in the shaft hole 2-7 of the follower wheel of the fixed crank 2 without friction force through the ball 2-3 of the follower wheel applied by a ball bearing;

d: wherein, a spindle bidirectional screw 1-2 in a bolt shape, one side of which is locked and combined with a pedal rotation central hole 3-2 of a telescopic crank 3 by screw threads, the other side is firstly adhered with grease by a cam ball 4-7 which is the same as that applied by a ball bearing, then is arranged at the inner side of a ball running ring 4-5 of a cam disc 4, the central hole 4-4 of the cam disc is aligned with the other side of the spindle bidirectional screw 1-2 to penetrate together, and a cam groove inner concave ring 4-6 is sleeved on a follow-up roller 2-4, then the pedal spindle 1-1 is taken to be mutually locked with the screw threads of the spindle bidirectional screw 1-2, at the moment, the cam disc 4 can freely rotate on the pedal spindle 1-1, and the cam groove inner concave ring 4-6 in the cam disc 4 rotates to lead the follow-up roller 2-4 to follow, the central hole 3-2 of the pedal rotation of the telescopic crank 3 is driven to make telescopic sliding relative to the following roller 2-4 of the fixed crank 2 by linkage;

e: the method comprises the steps that the balls 1-3 on the inner side of a pedal mandrel, which are the same as the balls applied to a ball bearing, are adhered with lubricating grease and then are arranged at the inner side end of a mandrel of the pedal mandrel 1-1, the pedal mandrel 1-1 with the balls 1-3 on the inner side of the pedal mandrel is inserted into a central shaft hole of the pedal 1, the balls 1-3 on the inner side of the pedal mandrel can stably roll, the balls 1-4 on the outer side of the pedal mandrel are adhered with lubricating grease and then are arranged on the ring side of an outer side central hole of the pedal 1, locking screws 1-5 on the outer side of the mandrel are locked, the pedal 1 can freely roll and rotate on the pedal mandrel 1-1 at the moment, anti-tooth anti-loosening screws 1-6 are locked, and;

f: the elastic linkage pin 1-7 is taken to insert the pedal and the cam disc linkage pin 1-7 a-side into the linkage pin limiting hole 1-12 at the inner side of the pedal 1, and the cam disc 4 is shifted to align the linkage pin angle adjusting hole 4-3 and the pedal and cam disc linkage pin 1-7a to be relatively inserted, then the linkage pin spring 1-8 is inserted into the linkage pin spring guide post 1-7b, at the moment, the baffle plate 1-9 is inserted into the rear outer side of the baffle groove 1-10, then the baffle plate 1-9 is integrally moved to the inner side, attention needs to be paid to aligning and penetrating the guide post spring rear baffle plate hole 1-9a and the linkage pin spring guide post 1-7b, and the linkage pin springs 1-8 are compressed, baffle plate screws 1-13 are taken to penetrate through baffle plate screw holes 1-11 and are locked with baffle plate lateral limiting screw holes 1-9 b;

g: the assembly of the above paragraphs a to F can complete the setting of the left foot telescopic crank portion of the telescopic crank device of the bicycle of the present invention, and the same operation and assembly are repeated, so that the right foot telescopic crank portion can also be completed and mounted on the central shaft 18 of the frame 17, and each course can be completed easily by using the telescopic crank cam disc device;

h: referring to fig. 1-3, when the rider treads the "foot pedal 1" on the ball of the foot, the force applied on the ball of the foot makes the "foot pedal 1" fit to the bottom of the ball of the foot and is approximately parallel to the "ground 19", as in the type of "pedal force application interval 16" described in paragraph [0009], when the "pedal 1" is considered to be operated in the "pedal force application interval 16" at a fixed angle and approximately parallel to the ground, the "pedal 1" makes the "pedal 1" and the "cam disc 4" have a relevant locking angle through the "elastic linking pins 1-7", so that the "elastic linking pins 1-7" can be combined with different hole sites on the "linking pin angle adjusting holes 4-3" according to the personal riding, and cooperate with the riding that the rider feels the most comfortable and efficient, for example, the "crank telescopic operation track 22" marked in fig. 1A is the operation track of "horizontal track R" passing through the "linking pin angle adjusting holes 4-3", if the elastic linking pins 1-7 are pushed to the outside at the inner side of the pedal 1 and compress the linking pin springs 1-8 and the cam plate 4 is rotated by an angle to make the pedal and cam plate linking pins 1-7a penetrate and combine with the hole sites of the upper linking pin angle adjusting holes 4-31, the horizontal track central axis R of the crank telescopic motion track 22 is rotated to move downwards to be the horizontal track central axis S of +20 degrees, that is, the position of the longest force arm is changed from the original 90-degree position to 110 degrees which is rotated downwards and deviated by 20 degrees, and similarly, if the pedal and cam plate linking pins 1-7a penetrate and combine with the hole sites of the lower linking pin angle adjusting holes 4-32, the horizontal track R of the crank telescopic motion track 22 is rotated upwards to be the horizontal track central axis T of-20 degrees, namely, the position of the longest force arm is shifted from the original 90-degree position to 70 degrees which is rotated upwards and is deviated by 20 degrees;

i: the above-mentioned H: in the operation of the "pedal force application section 16" described in the paragraph, when the foot pedal is stepped on to move forward, referring to fig. 16N2, when the foot pedal is stepped on to move forward to the "non-force application section 16-1", the foot pedal starts to be folded and placed on the "pedal 1", due to the cyclic movement of the human body joint structure, the "pedal 1" in the "non-force application section 16-1" will present the "pedal forward inclination angle X" (this part can be referred to as fig. 16), which is an unspecified angle, but the maximum angle will be in the position area of about 270 degrees, which is slightly different from the premise that the "pedal 1" is viewed as being parallel to the "ground 19", but this difference does not affect the overall discussion, as follows: as in the foregoing, the conversion of the "cam plate 4" between the pedals and the cam plate linkage pins 1-7a "is performed to insert and combine with the hole sites of the" upper linkage pin angle adjustment holes 4-31 "or the" lower linkage pin angle adjustment holes 4-32 ", so as to change the angular relationship between the" telescopic cranks 3 "and the" fixed cranks 2 "when the pedal ring is stepped around the" central axis 18 "of the bicycle, so that the" follower rollers 2-4 "on the" fixed cranks 2 "roll around the" cam groove inner concave rings 4-6 "of the" cam plate 4 ", and the" telescopic cranks 3 "which rotate in a linkage manner on the" cam plate center holes 4-4 "of the" cam plate 4 "is caused to perform an offset reaction, which is the theoretical practice of the present invention; when the foot stepping cycle is in the non-force application interval 16-1 to present the pedal forward inclination angle X, the pedal forward inclination angle X will modify the expansion relationship between the expansion crank 3 and the fixed crank 2 through the relative relationship between the cam groove inner concave ring 4-6 of the cam plate 4 and the follower roller 2-4 of the fixed crank 2;

j: the above theoretical explanation of A, H, I is also applicable to the application theoretical explanations of the subsequent paragraphs, and will not be repeated as much as possible.

Referring to fig. 4, 5 and 6, the present invention provides a dual link device of a telescopic crank for a bicycle, wherein a parallel link 10 is used, and the length of the link shaft hole is added when the dual link movable column 10-4 and the rotary link 11 rotate, so as to form the longest length of the telescopic crank, and the length of the link shaft hole is subtracted when the link shaft hole rotates, so as to form the shortest length of the telescopic crank (as illustrated in fig. 5E of paragraph [0025] in the illustration of the attached drawings); in this embodiment: wherein the pedal A7 is combined with the hexagonal fixed anti-rotation screw head 7-2 in a fixed angle, the polygonal anti-rotation male joint 7-4 on the pedal fixed spindle 7-1 and the polygonal anti-rotation female joint 10-1 of the parallel connecting rod 10 adopt a parallel type joint, which represents that the pedal A7 parallel to the ground 19 can promote the parallel connecting rod 10 to be similarly parallel to the ground 19, which is the basic principle of the telescopic crank double-connecting rod device of the bicycle (see paragraph B of [0064 ]);

the following description refers to fig. 4, 5, and 6 for the purpose of improving understanding of the architectural applications of the present invention;

a: as shown in fig. 13k-k, the anti-slip spring strips 6 are inserted into the mounting holes on the two sides of the fixed crank A8, and the application function of the anti-slip spring strips 6 is to prevent the pedal a7 from keeping its original posture when the rider is not riding or the rider's foot is temporarily away from the pedal a7, so that the pedal a7 does not shift up and down due to gravity, which affects the subsequent riding action of re-centering the pedal a7 and wastes time;

b: the inner side of the fixed crank A8 is provided with a connecting rod type telescopic crank 9 which can freely slide, the two are in a cylindrical groove form of a limit roller 5 to limit the sliding direction of the connecting rod type telescopic crank 9 and only allow the connecting rod type telescopic crank to freely slide along the length direction of the fixed crank A8, wherein, two groups of limit roller balls 5-3 applied to ball bearings are respectively arranged on two sides of the limit roller 5, the center of the limit roller 5 penetrates through the axle center 5-1 of the limit roller to enter the central hole of the limit roller and then penetrates through the axle hole 9-1 of the limit roller, and the axle center 5-1 of the limit roller is locked by a screw thread by a fixing screw 5-2 of the axle center of the limit roller, so that the connecting rod type telescopic crank 9 can be considered to slide along the length direction of the fixed crank A8 without friction force caused by the rolling of the ball; when the limiting roller 5 rolls and slides, a small interference force is generated with the anti-skid spring strip 6, the interference force is generated by the limiting roller 5 rolling and pressing the anti-skid spring strip 6, the interference force is increased along with the rolling side of the limiting roller 5, the interference force is reduced on the other side, so that a rider does not need to exert too much physical force for the interference force, and the rider does not disturb the position of the pedal A7 due to gravity when the rider stops temporarily;

c: inserting the pedal A7 into the assembled pedal fixing mandrel 7-1, wherein the hexagonal fixing anti-rotation screw head 7-2 of the pedal fixing mandrel 7-1 needs to be butted with the hexagonal fixing anti-rotation groove 7-7 of the pedal A7, the outer side of the pedal fixing mandrel is locked by the screw 7-8 on the outer side of the pedal fixing mandrel, and the pedal A7 and the polygonal anti-rotation male joint 7-4 form an integrally linked framework;

d: taking a rotating mandrel ball 7-5 applied by a ball bearing, placing the rotating mandrel ball 7-5 at the rotating mandrel 7-3 of a pedal fixing mandrel 7-1 after sticking lubricating grease, inserting the pedal fixing mandrel 7-1 with the rotating mandrel ball 7-5 into an axial hole 9-2 of a connecting rod type telescopic crank 9 so that the rotating mandrel ball 7-5 can stably roll, then taking a parallel connecting rod side telescopic crank ball 7-6 to stick lubricating grease, placing the parallel connecting rod side telescopic crank ball 7-6 at the axial hole 9-2 inner side annular side of the connecting rod type telescopic crank 9 and on a rotating mandrel 7-3 outer shaft, taking a parallel connecting rod 10 to align a parallel connecting rod side plane 10-7 approximately parallel to a treading surface of a pedal A7, inserting and combining a polygonal anti-rotation female joint 10-1 of the parallel connecting rod 10 and a polygonal anti-rotation male joint 7-4 of the pedal fixing mandrel 7-1, and is locked and combined by a parallel connecting rod fixing screw 10-2, and at the moment, the treading surface of the pedal A7 and the parallel connecting rod side plane 10-7 form an integrated linkage structure in a parallel form;

e: a round hole at the inner side of a connecting rod of a fixed crank A8 rotating and fixing guide post 8-1 is taken from a lubricated bearing 11-2 and inserted for later use;

f: coating lubricating grease on the concave side of a double-connecting-rod movable column 10-4 of a parallel connecting rod 10, then placing and installing a double-connecting-rod movable ball 10-3, taking a rotary connecting rod 11, aligning an outer connecting-rod movable column linkage hole 11-3 with a double-connecting-rod movable column 10-4, simultaneously aligning the rotary connecting rod guide column 11-1 with a central inner side round hole of a connecting rod rotary fixed guide column 8-1 inserted into a fixed crank A8 of a self-lubricating bearing 11-2, installing and inserting the rotary connecting rod 11, inserting a connecting rod guide column screw 11-6 into a connecting rod rotary fixed screw abdication hole 8-2 of a fixed crank A8 to be locked with the rotary connecting rod guide column 11-1, then coating the lubricating grease in the hole of the outer connecting-rod movable column linkage hole 11-3, and then installing the outer connecting-rod movable ball 11-4 applied to the ball bearing, locked by a ball nut 11-5;

g: the assembly and installation of the above paragraphs a to F can complete the assembly and installation of the right foot telescopic crank portion of the telescopic crank double-link device of the bicycle of the present invention, and the same operation and assembly are repeated, so that the left foot telescopic crank portion can be also installed and installed on the center shaft 18 of the frame 17, and each journey can be completed with the use of the telescopic crank device;

h: referring to fig. 4, when the rider treads on the "foot pedal a 7", the force applied to the ball will make the "pedal a 7" fit to the sole of the foot and be approximately parallel to the "ground 19", as in the pattern of the "pedal force application section 16" described in paragraph [0009], when it is considered that "pedal a 7" at a fixed angle and approximately parallel to the ground is operating in the "pedal force application section 16", the "pedal a 7" will make the "pedal a 7" and the "parallel link 10" have an associated locking angle through the "polygonal anti-rotation female joint 10-1", so that the "polygonal anti-rotation female joint 10-1" can be combined with the polygon on the "polygonal anti-rotation male joint 7-4" according to the riding habit of the individual, if the polygon male joint 7-4 "and the" anti-rotation female joint 10-1 "are set as 24, it means that each side difference has a 15-degree difference, and the adjustment is performed to match the riding that is considered most comfortable and most efficient (as shown in fig. 15L1 and L2, the polygonal anti-rotation female joint 10-1 may be a polygonal male-female joint with 18-36 sides, or a gear-shaped male-female joint with inner and outer teeth, or a 18-45 teeth match, so as to obtain a more detailed angle division match), the crank-telescopic operation track 22 shown in fig. 4 (but see fig. 1) is the operation track of the horizontal track R after the parallel link side plane 10-7 and the stepping surface of the pedal a7 are approximately parallel, or the rotation track of the polygonal male joint 7-4 and the polygonal female joint 10-1 are adjusted and matched up one side difference, as indicated in fig. 1, the horizontal track central axis R of the crank telescoping operation track 22 is rotated downward to form a horizontal track central axis S of +20 degrees, i.e., the position of the longest force arm is shifted from the original 90 degrees position to 110 degrees, which is rotated downward by 20 degrees, and similarly, the rotation is shifted upward to form a horizontal track central axis T of-20 degrees, i.e., the position of the longest force arm is shifted from the original 90 degrees position to 70 degrees, which is rotated upward by 20 degrees;

i: the above-mentioned H: in the operation of the "pedal force application section 16" in which the ball of the foot applies force to step forward, when the foot is stepped on to the "non-force application section 16-1", referring to fig. 16N2, when the ball of the foot starts to be folded and placed on the "pedal a 7", due to the cyclic motion of the human body joint structure, the "pedal a 7" in the "non-force application section 16-1" will exhibit the "pedal forward inclination angle X", which is an unspecified angle, but the maximum angle is in the position region of approximately 270 degrees, which is slightly different from the precondition that the "pedal a 7" is considered to be parallel to the "ground 19", but this difference does not affect the overall discussion, and the related discussion is as in paragraph I of [0065 ].

Preferably, referring to fig. 7 to 15, the present invention provides an application of a controllable dual-link device for a telescopic crank of a bicycle, which can be arbitrarily selected from 2 types to have a telescopic crank function device type or a shortest fixed crank function device type;

referring to fig. 7 and 8, when the present invention is applied in the form of a telescopic crank selected by a rider, the present embodiment: "foot pedal B12" has a crank extension/contraction trajectory 22, which is the shortest position of 165mm at approximately 270 degrees, the extension/contraction crank length of 182mm at 0 degrees and 180 degrees, and the extension/contraction crank length of 208.5mm at 90 degrees; the length change of the telescopic crank is used for obtaining the treading torque which can be increased by at most 26 percent, and the smooth operation of the human body is improved in a mode of gradually increasing and decreasing the length of the crank;

or the telescopic function can be selected to be closed at any time, and the circular track of the crank with the pure shortest crank arm of force of 165mm and the running minimum radius of 20 is formed; the related data is a proportional result of the parameters cited in the embodiment;

the principle of the embodiment is as follows: the length of the double-link movable column 10-4 of the double-function parallel connecting rod 10-5 is added with the length of the connecting rod shaft hole when the double-function rotating connecting rod 11-7 rotates to form the longest length of the telescopic crank, and the length of the connecting rod shaft hole is subtracted when the double-function rotating connecting rod rotates to form the shortest length of the telescopic crank (as illustrated in [0025] and figure 5E); as shown in fig. 10, the control ring pieces of the telescopic cranks are arranged on both sides of the pedal B12, when the lateral side of the foot touches the unlocking piece 15 alone, the internal mechanism pieces form the application of the telescopic crank device when the foot ring turns to the 270 degree position; when the inner side surface of the foot part independently touches the sliding sleeve outer ring 14-1, the inner mechanism member is limited to form the application of the shortest fixed crank device when the foot part ring rotates to the 270-degree position; the sliding sleeve 14 and the hexagonal sliding shaft 12-2 are combined at a fixed angle, the hexagonal sliding shaft 12-2 and the pedal B12 are linked by the central rod braking member 13-6 and the braking groove 12-11, and the central rod braking member 13-6 and the braking groove 12-11 can be controlled to be embedded or separated, which is the most important control member for realizing controllable operation in the embodiment; wherein the polygonal male joint 12-4 on the pedal rotating spindle 12-1 and the polygonal anti-rotation female joint 10-1 of the dual-function parallel connecting rod 10-5 adopt a parallel type joint, which represents the pedal B12 parallel to the ground 19 and the dual-function parallel connecting rod 10-5 also parallel to the ground 19, which is the basic principle of the telescopic crank controllable dual-connecting rod device of the bicycle (please refer to paragraph C of 0064 for detailed principle description);

for the purpose of enhancing understanding of the architectural applications of the present invention, reference is made to FIGS. 7-15;

a: as shown in fig. 13k-k, the two sides of the fixed crank A8 are inserted into the mounting holes on the two sides of the fixed crank A8, and the application function of the anti-slip spring 6 is to prevent the pedal B12 from keeping its original posture when the rider is not riding or the rider leaves the pedal B12 momentarily, so that the pedal B12 does not shift up and down due to gravity, which affects the action of re-righting the pedal B12 during subsequent riding and wastes time;

b: the inner side of the fixed crank A8 is provided with a connecting rod type telescopic crank 9 which can freely slide, as shown in figure 6, the two are in the form of a groove of a limit roller 5 to limit the sliding direction of the connecting rod type telescopic crank 9 and only allow the connecting rod type telescopic crank 9 to freely slide along the length direction of the fixed crank A8, wherein, the two sides of the limit roller 5 are provided with limit roller balls 5-3 applied by a group of ball bearings respectively, the center of the limit roller 5 penetrates through the axle center 5-1 of the limit roller to enter the center hole thereof and then penetrates through the axle hole 9-1 of the limit roller, and the axle center 5-1 of the limit roller is locked by a thread of a limit roller axle center fixing screw 5-2, so that the connecting rod type telescopic crank 9 can be considered as the sliding of the rolling without friction force of the ball bearings when the length of the fixed crank A8; when the limiting roller 5 rolls and slides, a small interference force is generated with the anti-skid spring strip 6, the interference force is generated by the limiting roller 5 rolling and pressing the anti-skid spring strip 6, the interference force is increased along with the rolling side of the limiting roller 5, the interference force is reduced on the other side, so that a rider does not need to exert too much physical force for the interference force, and the rider does not disturb the position of the pedal B12 due to gravity when the rider stops temporarily;

c: as shown in fig. 11 and 12: taking a pedal rotating mandrel 12-1 applied by a ball bearing, inserting rotating inner side balls 12-9 of a pedal B adhered with lubricating grease into a pedal B12 on the shaft-shaped outer edge side, installing rotating outer side balls 12-8 of the pedal B adhered with lubricating grease into an outer side hole of a pedal B12 and the outer edge side of the shaft outer side of the pedal rotating mandrel 12-1, locking screws 12-7 on the outer side of a core shaft in a threaded manner, freely rotating the pedal rotating mandrel 12-1 in a middle hole of a pedal B12 at the moment, aligning braking sliding grooves 12-15 with braking grooves 12-11, sleeving a sliding sleeve 14 on a hexagonal sliding shaft 12-2 of the pedal rotating mandrel 12-1, aligning a braking groove hole on the sliding sleeve 14 with the braking grooves 12-11 and then sleeving a sliding sleeve outer ring 14-1 on the outer edge side of the sliding sleeve 14, the surface of the sliding sleeve is sleeved and adhered with a sliding sleeve spring leaf 14-2, a spring leaf mounting screw 14-3 is sequentially mounted, combined and locked on a sliding sleeve outer ring 14-1 and a screw hole of the sliding sleeve 14, so that the elastic distance buffering and the spring propelling force of elastic deformation of the sliding sleeve spring leaf 14-2 are provided between the sliding sleeve outer ring 14-1 and the sliding sleeve 14 when the axial radial differential motion is performed; sequentially throwing a positioning rod limiting piece 13-4, a braking center spring 13-8 and a spring lower baffle plate into a central hole of an outer hollow shaft of a pedal rotating spindle 12-1, putting a central rod braking piece 13-6 into a braking sliding groove 12-15, and obtaining a concentric position, penetrating a central positioning switching rod 13 into a central positioning rod hole 12-6, sequentially penetrating a positioning rod limiting piece 13-4, a braking center spring 13-8 and a central rod braking piece 13-6 and a spring lower baffle plate, enabling a positioning rod limiting section difference 13-1 of the central positioning switching rod 13 to be in contact with the positioning rod limiting piece 13-4 for limiting, enabling the central positioning switching rod 13 to penetrate through a spindle outer side locking screw 12-7 of the pedal rotating spindle 12-1, and then unlocking a connecting piece 13-5 to enable a connecting positioning rod thread 13-3 of the central positioning switching rod 13 to be locked and connected, (as shown in fig. 15I, J1), the unlocking member positioning rotating arm 15-3 of the unlocking member 15 is inserted into the unlocking member positioning rotating slot 12-14, the unlocking spring piece 15-1 is forcibly and elastically sleeved into the groove ring of the unlocking link member 13-5, the spring piece fixing screw 15-2 is used to lock the unlocking spring piece 15-1 in the mounting groove above the unlocking member 15, so that the unlocking spring piece 15-1 limits the unlocking link member 13-5, and the preliminary assembly of the pedal B12 is completed as described above;

d: referring to FIGS. 11 to 14, the above C: the pedal B12 which is initially assembled is adhered with lubricating grease on the mandrel 12-3 above the pedal B12, then the outside ball 12-12 of the mandrel applied by the ball bearing is arranged at the outer edge side of the outside ball, and is inserted into the axial hole 9-2 of the connecting rod type telescopic crank 9, and the outside ball 12-12 of the mandrel can stably roll, then the inside ball 12-13 of the mandrel at the side of the dual-function parallel connecting rod 10-5 is adhered with lubricating grease and is arranged at the side of the axial hole 9-2 of the connecting rod type telescopic crank 9 and the outer shaft of the mandrel 12-3, the parallel connecting rod side plane 10-7 of the dual-function parallel connecting rod 10-5 is approximately aligned with the treading surface of the pedal B12 in parallel, the polygonal anti-rotation female joint 10-1 of the dual-function parallel connecting rod 10-5 is inserted and combined with the polygonal male joint 12-4 of the pedal rotating mandrel 12-1, and the parallel connecting rod nut 10-6 is locked and combined with the locking external thread 12-5, and at the moment, the treading surface of the pedal B12 and the parallel connecting rod side plane 10-7 form an integrated linkage framework in an approximately parallel form;

e: a round hole at the inner side of a connecting rod rotating and fixing guide post 8-1 of a fixed crank A8 is taken from a lubricating bearing 11-2 and is inserted for standby (the 8-1 is marked in figure 6F 1);

f: as shown in fig. 11-13, a dual-function rotary connecting rod 11-7 is taken, a central rod locking steel ball 11-8 is put into a lateral positioning hole of the dual-function rotary connecting rod 11-7, a locking steel ball spring 11-9 is put into the hole, and then a locking steel ball screw 11-10 is used for locking the components;

g: and (3) coating lubricating grease on the concave side of the double-connecting-rod movable column 10-4 of the double-function parallel connecting rod 10-5, putting and installing the double-connecting-rod movable ball 10-3 applied to the thrust ball bearing, and taking the following components: the dual-function rotary connecting rod 11-7 completed in the paragraph aims at the linkage hole 11-3 of the outer connecting rod movable column to the dual-connecting rod movable column 10-4, simultaneously aims at the round hole at the inner side of the center of the connecting rod rotary fixing guide column 8-1 of the fixing crank A8 inserted into the self-lubricating bearing 11-2, installs and inserts the dual-function rotary connecting rod 11-7, uses the connecting rod guide column screw 11-6 to insert and lock the rotating connecting rod guide column 11-1 from the connecting rod rotary fixing screw abdicating hole 8-2 of the fixing crank A8, at the moment, coats lubricating grease in the hole of the linkage hole 11-3 of the outer connecting rod movable column, and then installs and places the outer connecting rod movable ball 11-4 applied by the thrust ball bearing and locks the ball nut 11-5;

h: the assembly and the installation of the above A-G paragraphs can complete the assembly and the installation of the left foot telescopic crank part of the telescopic crank controllable double-link device of the bicycle, the same operation and the combination are repeated, the right foot telescopic crank part can be also completed and installed on the middle shaft 18 of the frame 17, and the controllable telescopic crank double-link device can be applied to accompany and easily complete each route;

i: referring to fig. 7-9, when the rider steps on the "foot pedal B12", the force applied to the ball of the foot makes the "pedal B12" fit to the sole of the foot and is approximately parallel to the "ground 19", as shown in the "pedal force application section 16" described in paragraph [0009], when the "pedal B12" is operated in the "pedal force application section 16" with a fixed angle and approximately parallel to the ground, as indicated by the reference to fig. 11-12, the "pedal B12" makes the "pedal B12" and the "dual function parallel link 10-5" have an associated locking angle through the "polygonal female anti-rotation joint 10-1", and the "polygonal female anti-rotation joint 10-1" can be combined with the polygon on the "polygonal male joint 12-4" according to the riding habits of the individual, if the "male joint 12-4" and the "female anti-rotation joint 10-1" are arranged as a 36-sided shape, it represents that there is a difference of 10 degrees between each two sides, and the adjustment is performed to match the riding that is considered most comfortable and most efficient (as shown in fig. 15L1 and L2, the polygonal anti-rotation female joint 10-1 may be a polygonal male-female joint with 18-36 sides, or a gear-shaped male-female joint with 18-45 teeth, so as to obtain a more detailed angle division matching), referring to the crank expansion operation trajectory 22 marked in fig. 1 and 7 as the operation trajectory of the horizontal trajectory central axis R after the stepping surface of the parallel link side plane 10-7 and the stepping surface of the pedal B12 are approximately parallel, for example, when the adjustment matching is performed with one side of the upper-lower anti-rotation difference between the polygonal male joint 12-4 and the polygonal female joint 10-1, as shown in fig. 1, the horizontal track central axis R of the crank telescoping motion track 22 is rotated downward to form a horizontal track central axis S of +20 degrees, i.e. the position of the longest force arm is shifted from the original 90 degrees position to 110 degrees, which is rotated downward by 20 degrees, and is also rotated upward to form a horizontal track central axis T of-20 degrees, i.e. the position of the longest force arm is shifted from the original 90 degrees position to 70 degrees, which is rotated upward by 20 degrees;

j: as shown in fig. 10, when the inner side of the foot touches and continuously presses the outer ring 14-1 of the sliding sleeve at any time, the pressure of the inner side of the foot is increased by the pressure of C of [0064] and [0067 ]: the relationship of the members as described in the paragraph, as shown in FIGS. 11 and 14, elastically pulls the sliding sleeve 14 out of the sliding sleeve hole 12-10 via the elastic deformation buffer of the sliding sleeve spring leaf 14-2, and moves the central rod detent 13-6, while the central rod detent 13-6 remains about 1/5 on the inner side of the detent groove 12-11 (as shown in FIG. 15J2), and continues to perform the moving task of the central rod detent 13-6 and the pedal B12 until the pedal B12 rotates to about 270 degrees, as shown in FIGS. 14G5 and G6, at which time the differential front end 13-7 of the central rod detent 13-6 is engaged with the left crank differential groove 9-4 as shown in FIG. 15H1, or the right crank differential groove 9-5 as shown in H2 (as shown in FIG. 15J3), and thus performs the disengaging task of the central rod detent 13-6 from the detent groove 12-11 of the pedal B12, the instant separation action is completed by the elastic force of the sliding sleeve spring piece 14-2 and the braking center spring 13-8; when the central rod brake 13-6 and the pedal B12 do not reach the 270 degree position, the inner side of the foot contacts and continuously presses the sliding sleeve outer ring 14-1 at any time point to force the sliding sleeve spring leaf 14-2 and the brake central spring 13-8 to make elastic deformation, and the differential front end 13-7 and the contact ring side of the connecting rod type telescopic crank 9 present limited elastic friction; as shown in fig. 10, when the above-mentioned disengaging task is achieved, the braking center spring 13-8 also pushes the front end point of the center positioning switching rod 13 to be converted from the blocking contact with the circular ring-shaped plane 11-12 of the dual-function rotating connecting rod 11-7 to be concessionally sleeved into the center rod locking hole 11-11, so as to complete the locking task of the dual-function parallel connecting rod 10-5 and the dual-function rotating connecting rod 11-7, and at the same time, the above-mentioned F: the central rod locking steel ball 11-8 in the paragraph limits the locking position 13-2 of the positioning rod of the central positioning switching rod 13 through the elastic force of the locking steel ball spring 11-9, so that the locking task is stable and unchanged until the outside of the foot touches and continuously presses the unlocking piece 15 at any time point to convert the function, at this time, the pedal B12 is not linked with the pedal rotating mandrel 12-1, and the external side ball 12-8 of the pedal B and the internal side ball 12-9 of the pedal B shown in fig. 14G3 rotate to perform the rolling rotation function;

when the rider touches and continuously presses the unlocking member 15 at any time point from the outside of the foot, the unlocking spring piece 15-1 pulls the unlocking connecting member 13-5 with elastic force to link the center positioning switching rod 13, at this time, the center positioning switching rod 13 is about to be separated from the center rod locking hole 11-11, but the center rod detent member 13-6 rubs against the front ring 12-16 of the detent groove of the pedal B12 and cannot be inserted into the detent groove 12-11 (as shown in fig. 11), see fig. 14G4, at this time, the unlocking spring piece 15-1 is elastically deformed and urges the detent center spring 13-8 to be elastically deformed, until the pedal B12 is treaded and rotated to be displaced to 270 degrees, the elastic deformation force of the instant unlocking spring piece 15-1 and the detent center spring 13-8 urges the center rod detent member 13-6 to be inserted into the detent groove 12-11, the sliding sleeve 14 is pushed synchronously and is linked with the sliding sleeve outer ring 14-1 to reset through the sliding sleeve spring leaf 14-2, at the moment, the synchronous central positioning switching rod 13 is pushed to return to the original position by the elastic deformation force of the unlocking spring leaf 15-1 and the braking central spring 13-8 to form the operation state of a telescopic crank of the bicycle, at the moment, the internal hexagonal slotted hole of the sliding sleeve 14 and the hexagonal sliding shaft 12-2 enable the pedal B12 and the pedal rotating mandrel 12-1 to be integrated again through the central rod braking part 13-6, and the telescopic function of the parallel operation dual-function rotating connecting rod 11-7 of the linked dual-function parallel connecting rod 10-5 is realized according to the linkage.

The component numbers referred to in this specification: the present embodiment is embodied by "left and right pedals 23": the description of "pedal 1", or "pedal A7", or "pedal B12" is used throughout the specification; the present embodiment is included in the "left and right fixed cranks 24": the description of the entire description is referred to as "fixed crank 2" or "fixed crank 8"; the present embodiment is included in the "left and right telescopic cranks 25": the description will be referred to as "telescopic crank 3" or "connecting rod type telescopic crank 9" throughout the specification.

Claims (16)

1. A telescopic crank device for a bicycle, comprising a fixed crank (2), a telescopic crank (3) and a cam disc (4) angularly associated with a pedal (1), characterized in that:

the two-way screw of mandrel (1-2) of pedal passes cam disc centre bore (4-4) of cam disc and flexible crank's pedal rotatory centre bore (3-2) is the rotatory composite member of coaxial axle center, works as when the pedal is trampled rotatoryly, follow-up gyro wheel (2-4) of last installation of fixed crank roll the operation in during concave circle (4-6) in the cam groove of cam disc, drive flexible crank follows the concave circle in the cam groove makes orderly flexible slip.

2. A telescopic crank device for a cycle as claimed in claim 1, wherein:

the pedals are provided with elastic linkage pins (1-7) so that the pedals and the cam disc have angle association limitation.

3. A telescopic crank device for a bicycle, comprising a fixed crank A (8), a connecting rod type telescopic crank (9) and parallel connecting rods (10) and rotary connecting rods (11) angularly associated with pedals A (7), characterized in that:

the pedal fixing mandrel (7-1) of the pedal A is provided with a polygonal anti-rotation male joint (7-4) which penetrates through a shaft center hole (9-2) of the connecting rod type telescopic crank and is in sleeve joint linkage with a polygonal anti-rotation female joint (10-1) of the parallel connecting rod and limits the angle, when the pedal A is pedaled and rotated, the pedal A is in linkage with the parallel connecting rod at a fixed angle, so that a double-connecting-rod movable column (10-4) of the parallel connecting rod drives an outer connecting rod movable column linkage hole (11-3) of the rotating connecting rod to rotate, a rotating connecting rod guide column (11-1) of the rotating connecting rod rotates by taking a connecting rod rotating and fixing guide column (8-1) of the fixing crank A as a center, and when the pedal A installed in the shaft center hole of the connecting rod type telescopic crank is pedaled to rotate, making orderly telescopic sliding movements with respect to the fixed crank a.

4. A telescopic crank device for a bicycle, comprising a fixed crank A (8), a connecting rod type telescopic crank (9) and a dual-function parallel connecting rod (10-5) and a dual-function rotating connecting rod (11-7) angularly associated with a pedal B (12), characterized in that:

a pedal rotating mandrel (12-1) of the pedal B is provided with a polygonal male joint (12-4) which penetrates through a shaft center hole (9-2) of the connecting rod type telescopic crank and is in sleeve joint linkage with a polygonal anti-rotation female joint (10-1) of the dual-function parallel connecting rod and limits the angle, when the pedal B is pedaled and rotated, the pedal B is in linkage with the dual-function parallel connecting rod (10-5) by a fixed angle, so that a dual-connecting-rod movable column (10-4) of the dual-function parallel connecting rod drives an outer connecting rod movable column linkage hole (11-3) of the dual-function rotating connecting rod to rotate, a rotating connecting rod guide column (11-1) of the dual-function rotating connecting rod rotates by taking a connecting rod rotating and fixing guide column (8-1) of the fixed crank A as a center, and when the pedal B installed in the shaft center hole of the connecting rod type telescopic crank is pedaled and, making orderly telescopic sliding movements with respect to the fixed crank a.

5. A telescopic crank device for cycles, according to claim 1, 3 or 4, wherein said fixed crank (2) of claim 1, or said fixed crank A (8) of claim 3 or 4, characterized in that:

and anti-skidding spring strips (6) are arranged on two sides of the fixed crank or the fixed crank A.

6. A telescopic crank device for a bicycle, according to claim 1, 3 or 4, wherein the telescopic crank (3) according to claim 1, or the link-type telescopic crank (9) according to claim 3 or 4, characterized in that:

and a limiting roller (5) is arranged above the telescopic crank or the connecting rod type telescopic crank.

7. A telescopic crank device for cycles, according to claim 3 or 4, wherein the polygonal anti-rotation female joint (10-1) according to claim 3 or 4, characterized in that:

the polygonal anti-rotation female joint (10-1) is a female joint with an inner 18-36-sided shape, or the polygonal anti-rotation female joint (10-1) is a female joint with an inner tooth type of 18-45 teeth.

8. A telescopic crank device for a bicycle, according to claim 3 or 4, comprising the connecting rod type telescopic crank (9) and parallel links (10) and rotary links (11) of claim 3, or the connecting rod type telescopic crank (9) and dual function parallel links (10-5) and dual function rotary links (11-7) of claim 4, characterized in that: the double-connecting-rod movable column (10-4) of the parallel connecting rod or the double-functional parallel connecting rod linked on the connecting rod type telescopic crank is rotationally linked with the outer connecting-rod movable column linkage hole (11-3) of the rotary connecting rod or the double-functional rotary connecting rod; the distance (Y) between the shaft holes of the parallel connecting rods and the distance (Z) between the shaft holes of the rotating connecting rods are in mutual rotating linkage; or the distance (Y) between the shaft holes of the dual-function parallel connecting rods and the distance (Z) between the shaft holes of the dual-function rotating connecting rods which are mutually rotated and linked; the distance between the combined shaft holes when the front end of the pedal is positioned in a 70-110-degree position interval is (Z) + (Y), so that the connecting rod type telescopic crank is the longest; the distance between the combined shaft holes when the connecting rod type telescopic crank is positioned in the position range of 250-290 degrees at the rear end of the treading is (Z) - (Y), so that the connecting rod type telescopic crank is the shortest.

9. A telescopic crank controllable double link device for a bicycle, comprising a telescopic crank device for a bicycle according to claim 4, wherein said pedal B (12) has a combined member of a sliding sleeve outer ring (14-1) for closing the telescopic crank, characterized in that:

the sliding sleeve outer ring (14-1) is touched through the inner side of the front part of feet of a rider, the sliding sleeve outer ring pulls the sliding sleeve spring piece (14-2), and the sliding sleeve (14) in the elastic deformation mode of the sliding sleeve spring piece slides inwards to drive the central rod braking piece (13-6) to be separated from the braking groove (12-11) of the pedal B, so that the function of the telescopic crank can be closed.

10. A telescopic crank controllable double link device for a bicycle, comprising a telescopic crank device for a bicycle according to claim 4, wherein said pedal B (12) has a combined member of an unlocking member (15) for opening the telescopic crank, characterized in that:

the unlocking piece (15) is touched through the outer side of the front foot part of a rider, the unlocking piece pulls the unlocking spring piece (15-1), the unlocking connecting piece (13-5) is pulled through the unlocking spring piece in an elastic deformation mode, the linkage center positioning switching rod (13) slides towards the outer side, the braking center spring (13-8) is compressed, and the braking piece (13-6) of the center rod is elastically driven, so that the braking piece of the center rod has quick elastic kinetic energy when reaching an embedding position, is quickly embedded into the braking groove (12-11) of the pedal B to complete linkage, quickly exits the interference of the center positioning switching rod on the double-function rotating connecting rod (11-7), and the function of the telescopic crank can be recovered for use.

11. A telescopic crank controllable double link device for a bicycle according to claim 9 or 10, wherein said central rod brake member (13-6) has a combined member of a braking central spring (13-8) and a centrally located switching rod (13), characterized in that:

the central positioning switching rod (13) penetrates through the braking central spring and the central hole of the braking part of the central rod according to a central axis, and then is interlocked with the unlocking connecting piece (13-5) by threads to form an assembly; when the braking part of the central rod is separated from the pedal B (12) by the deformation force of the sliding sleeve spring piece (14-2), the braking part of the central rod gives elastic propelling force to the central positioning switching rod through the elastic deformation force of the braking central spring, so that the central positioning switching rod can instantly lock the dual-function rotating connecting rod instantly when the central positioning switching rod rotates to reach the central rod locking hole (11-11) of the dual-function rotating connecting rod (11-7).

12. A method for extending and retracting a crank when a ring of an extensible crank device of a bicycle is trampled comprises the following steps:

a crank extending and retracting cycle operation method is performed in which left and right extending and retracting cranks (25) are interlocked by attaching the feet of a rider to left and right pedals (23) which are stepped on at a fixed angle and approximately parallel to the ground (19) in a ring pedal force application section (16).

13. A method of crank extension and retraction when pedalling in a cycle of telescopic crankset of a bicycle, as claimed in claim 12, wherein the left and right pedals (23) are crank extension and retraction cycle operating members comprising pedals (1), and wherein the left and right extension cranks (25) are crank extension and retraction cycle operating members comprising extension cranks (3), characterized in that:

when a rider tramples forward, the pedals (1) are arranged on a telescopic crank (3) and are coaxial with a rotating shaft center, elastic linkage pins (1-7) which are related to a cam disc (4) with a center hole in a fixed angle are installed, follow-up rollers (2-4) are arranged in cam groove inner concave rings (4-6) of the cam disc with the center hole in an offset mode and can roll in the cam groove inner concave rings in a following mode, the follow-up roller shaft center (2-1) of each follow-up roller is installed in a follow-up roller shaft hole (2-7) of a fixed crank (2), so that the follow-up rollers can wind in the cam groove inner concave rings and move in a following mode and move in a telescopic mode along offset size differences generated by the cam disc with the center hole in an offset mode to move in a telescopic sliding mode.

14. A method of crank extension and retraction when pedaling a ring of a telescopic crank unit of a bicycle according to claim 12, comprising crank extension and retraction cycle operating means of left and right pedals (23) and left and right telescopic cranks (25) therein, characterized in that: left and right pedals (23) which can freely rotate and are arranged on the axle center holes (9-2) of the left and right telescopic cranks (25) when a rider steps on the pedals to advance, parallel connecting rods (10) which form a fixed angle with the left and right pedals and are related, double-connecting-rod movable columns (10-4) of the parallel connecting rods, the outer connecting rod movable column interlocking hole (11-3) of the rotary connecting rod (11) can be driven to lead the rotary connecting rod guide column (11-1) which is sleeved with the left and the right fixed cranks (24) at the other side of the rotary connecting rod to roll at a fixed point relative to the left and the right fixed cranks, when riding, the rotating connecting rod is enabled to generate a round motion around the outer ring of the parallel connecting rod, the parallel connecting rod is enabled to drive the left pedal and the right pedal to be linked, and the left and right telescopic cranks are connected to stretch and slide along the angle change of the parallel connecting rods and the rotating connecting rods, and the generated interaxial distance size difference.

15. A method for closing the function of a telescopic crank of a bicycle by controlling the fixed position angle of a double-link device of the telescopic crank comprises the following steps:

in any foot angle of 360 degrees of the ring, the function of closing the telescopic crank is started in a mode that the foot continuously gives pressure to touch an outer ring (14-1) of the sliding sleeve, a spring piece indirectly pulls a braking piece (13-6) of a central rod in an elastic deformation mode to enable the braking piece to be in a half-separated state from a braking groove (12-11), the braking piece of the central rod is sleeved in a crank differential groove (9-6), the braking piece of the central rod is enabled to be completely separated from the braking groove, a central positioning switching rod (13) is synchronously enabled to be interfered with a central rod locking hole (11-11), the function of responding to closing the telescopic crank is completed, and at the moment, a left pedal (23) and a right pedal (23) can freely rotate to drive to.

16. A method for starting the function of a telescopic crank by a fixed position angle of a telescopic crank controllable double-link device of a bicycle comprises the following steps:

in any foot angle of 360 degrees of the ring, the function of starting the telescopic crank is started in a mode that the foot continuously gives pressure to touch the unlocking plate (15), the braking parts (13-6) of the central rod are indirectly pulled in an elastic deformation mode through the spring piece to enable the braking parts to be in a shape of being elastically attached to the front ring (12-16) of the braking groove, the braking parts of the central rod are elastically bounced into the braking grooves (12-11) until the moment, the braking parts of the central rod are enabled to be completely linked with the braking grooves, the central positioning switching rod (13) is synchronously enabled to be separated from the locking holes (11-11) of the central rod, the function of starting the telescopic crank in response is completed, and the left pedal (23) and the right pedal (23) are in.

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