CN103419887A - Effort-saving device for bicycles - Google Patents

Abstract

The bicycle transmission rod comprises two transmission rods, two auxiliary support rods, two guide rods and two pedals, wherein a first pivot part which can be coupled with a free end of a corresponding crank is arranged between the front end and the rear end of each transmission rod, the rear end is positioned outside a rear wheel of a bicycle, a guide hole is concavely arranged on the end surface of the rear end, and the front end of each transmission rod is provided with the corresponding pedal; in addition, an auxiliary support rod is fixed at each end of the rear wheel shaft of the bicycle, the auxiliary support rod extends towards the rear of the rear wheel of the bicycle and is coupled with a guide rod, the guide rod can be symmetrically matched with the guide hole of the transmission rod in a sliding manner, when the pedal is treaded by two feet, the transmission rod can swing with the first pivot part as a fulcrum, the guide rod can stretch along the guide hole and can swing with the second pivot part and the third pivot part as fulcrums to correspond to each other, and therefore the pedal can drive the bicycle to move in a labor-saving manner.

Description

Effort-saving device for bicycles

technical field

The invention relates to a bicycle, in particular to a labor-saving device for a bicycle.

Background technique

Traditional bicycle is just as shown in Figure 1, and it includes:

A frame 11 with a rear fork 111 at the rear, and a front fork 112 coupled to the front end, and a bottom bracket 113 between the rear fork 111 and the front fork 112;

A rear wheel 12, which is pivotally connected to the rear fork 111 with a rear wheel shaft 121;

A front wheel 13 pivotally connected to the front fork 112;

A central axis 14 pivotally connected to the bottom bracket 113, the central axes of the central axis 14, the rear wheel 12 and the front wheel 13 are parallel to each other, and the two ends of the central axis 14 protrude from the bottom bracket 113;

A front sprocket 15 fixed on the center shaft 14;

A rear sprocket 16 fixed on one end edge of the rear axle 121;

A chain 17 encircling the front sprocket 15 and the rear sprocket 16;

Two cranks 18A, 18B, one end of which is symmetrically fixed on both ends of the central axis 14, and the two cranks 18A, 18B are arranged at an interval of 180 degrees;

The two pedals 19A, 19B are symmetrically pivoted on the free ends of the two cranks 18A, 18B to provide people with both feet to step on, so that the torque acts on the two cranks 18A, 18B to drive the front sprocket 15 to rotate. By the chain 17, The power transmission of the rear sprocket 16 drives the rear wheel 12, so that the bicycle can be driven forward. However, when the two cranks 18A, 18B are provided for people to step on, the torque generated by the applied force is also constant. In this way, riding these bicycles is quite labor-intensive, which is not enough to provide labor-saving operation.

Based on the lack of labor-saving of existing bicycles, there is a "bicycle with labor-saving effect" in Taiwan, China M376509. However, this prior patent has at least the following shortcomings:

1. It is not conducive to DIY assembly; because the guide plate must be fixed on the frame, it must be welded and fixed on the frame with a spot welder, or the frame must be drilled to make the guide The screw lock is fixed on the frame, so it can be seen that such welding or drilling operations are really not conducive to people's DIY assembly.

2. The manufacturing cost is high; the guide disc and its egg-shaped track must be milled by CNC, and the overall manufacturing cost is expensive.

3. The structure is easy to be damaged; under the limitation of space, the sliding area of the inner crank and the outer crank is quite limited, so there will be a problem of easy damage due to stress concentration. Furthermore, when the free end of the guide rod slides along the egg-shaped track in a limited position, it is subjected to a local frictional force, which has the disadvantage of loosening or interference after a period of use.

Based on the shortcomings of the above-mentioned prior patents, the inventor has developed a more progressive invention through continuous conception and research based on years of professional experience and experience.

Contents of the invention

The object of the present invention is to provide a labor-saving device for a bicycle, which can drive the bicycle to travel in a labor-saving manner, runs smoothly and stably, and has the advantages of easy assembly and low cost. the

A labor-saving device for a bicycle, comprising:

Two transmission rods, which are provided with a first pivot between the front end and the rear end, so that the two transmission rods can be symmetrically coupled to the existing two crank free ends of the bicycle with the first pivot, and the rear ends of the transmission rods are located at On the outer side of the rear wheel of the bicycle, a guide hole is recessed on the end face of the rear end;

The two auxiliary struts have opposite first ends and second ends, and an assembly part is provided at the first end, so that the two auxiliary struts can be symmetrically fixed on both ends of the existing rear wheel axle of the bicycle by the assembly parts, As for the second ends of the two auxiliary struts, they extend toward the rear of the rear wheel of the bicycle, and a second pivot is provided at the second ends;

The two guide rods are symmetrically fitted in the guide holes of the two transmission rods, and a third pivot is provided at the position protruding from the guide holes, so that the two guide rods can be symmetrically coupled to each other by the third pivot. the second pivot of the two auxiliary struts;

Two pedals, which are symmetrically arranged at the front ends of the two transmission rods. When the two feet are stepped on, the transmission rod can swing with the first pivot as the fulcrum, and the guide rod can expand and contract along the guide hole, and the second and third pivots As the swing response of the fulcrum.

The front end of the transmission rod is provided with several adjustment holes for pedal installation at intervals.

The first end of the auxiliary strut is provided with a hole-shaped assembly part, which can be fixed through the screw of the nut to be fixedly connected to both ends of the existing rear wheel axle of the bicycle. The second ends of the two auxiliary struts are A shaft-shaped second pivot is connected in total; the guide rod is provided with a hole-shaped third pivot, so that the two guide rods can be symmetrically coupled to the second pivot of the two auxiliary rods with the third pivot. department.

The transmission rod is a rectangular frame with a hollow inside, and an inner tube is fixed inside, so that the end face of the rear end of the transmission rod is concavely provided with a coaxially arranged guide hole.

The transmission rod has a second crank extending toward the front wheel, and the second crank is provided with a plurality of adjustment holes for pedal installation at intervals.

The first pivot of the transmission rod is in the shape of a hole, and the first pivot can provide a shaft through the pivot, so that the first pivots of the two transmission rods can be symmetrically coupled to the existing two crank free ends of the bicycle.

Compared with the M376509 patent, the present invention has the following improvements:

1. It has the advantage of DIY assembly; because the present invention only installs transmission rods, auxiliary support rods and guide rods on the existing bicycles, it can be completed without additional processing of the frame. From this point of view, it has a little mechanical knowledge Both can be easily assembled by themselves.

2. Low manufacturing cost; the processing of the transmission rod, auxiliary support rod and guide rod of the present invention can be completed without special machining, so the overall manufacturing cost is much lower than that of the M376509 patent.

3. High practicability; the overall cooperation of the crank, transmission rod, auxiliary support rod, guide rod and rear wheel shaft of the present invention forms a restraint chain structure, and when the transmission rod rotates, the central axis and the remote auxiliary support rod It can be effectively supported, so the present invention is much smoother and more stable than the previous patent M376509 when it is running, and has the advantage of being able to provide labor-saving operation and use of bicycles for a long time.

Description of drawings

Fig. 1 is the transmission schematic diagram of existing bicycle;

Fig. 2 is the exploded schematic diagram of the present invention;

Fig. 3 is a combined appearance schematic diagram of the present invention;

Fig. 4 is a schematic cross-sectional view of the present invention along the axial direction of the transmission rod;

Fig. 5A is a schematic diagram of the first position of the labor-saving device of the present invention;

Fig. 5B is a schematic diagram of the second position of the labor-saving device of the present invention;

Fig. 5C is a schematic diagram of the third position of the labor-saving device of the present invention;

Fig. 5D is a schematic diagram of a fourth position of the labor-saving device of the present invention.

[Description of main component symbols]

Common part:

11 frame 111 rear fork

112 Front fork 113 Bottom bracket

12 rear wheel 121 rear wheel axle

13 front wheel 14 central axis

15 Front sprocket 16 Rear sprocket

17 chain 18A, 18B crank

19A, 19B pedals

Part of the invention:

20 Frame 21 Rear Fork

22 Front fork 23 Bottom bracket

31 Rear wheel 311 Rear axle

32 Front Wheel 33 Central Axis

34 Front sprocket 35 Rear sprocket

36 chain 37A, 37B crank

40 Labor-saving device 41 Transmission rod

410 Inner tube 411 Guide hole

412 Second crank 413 Adjustment hole

414 First pivot part 42 Shaft

43 Guide rod 431 Third pivot

44 Auxiliary pole 441 Assembly department

442 Second hub 45 Lock ring

46 pedals.

Detailed ways

In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific examples.

Please refer to Fig. 2 to Fig. 4, bicycle of the present invention includes:

A vehicle frame 20 has a rear fork 21 at the rear, and a front fork 22 is coupled to the front end, and a bottom bracket 23 is arranged between the rear fork 21 and the front fork 22;

A transmission device, it is made up of rear wheel 31, front wheel 32, center shaft 33, front sprocket wheel 34, rear sprocket wheel 35, chain 36 and crank 37A, 37B; Described rear wheel 31 center is with a rear axle 311 It is pivotally connected to the rear fork 21, as for the front wheel 32, it is pivotally connected to the front fork 22, and the central axis 33 is pivotally connected to the bottom bracket 23. The center of the central axis 33, the rear wheel 31 and the front wheel 32 The axes are parallel to each other, and the bottom bracket 23 protrudes from the two ends of the central sky shaft 33; And surround the front sprocket 34 and the rear sprocket 35 with a chain 36, as for two cranks 37A, 37B, one end is symmetrically fixed at the central sky mandrel 33 two ends, and two cranks 37A, 37B are spaced 180 degree configurations, make It can alternately rotate the front sprocket 34 and the rear wheel 31 counterclockwise to drive the vehicle frame 20 to move forward;

A labor-saving device 40, which is mainly composed of two transmission rods 41, two auxiliary poles 44, two guide rods 43 and two pedals 46; An inner tube 410 is used to make the end face of the transmission rod 41 rear end concavely provided with a coaxially configured guide hole 411, and the transmission rod 41 has a second crank 412 extending in the direction of the front wheel 32. The second crank 412 Several adjustment holes 413 are arranged at intervals, and the transmission rod 41 is further provided with a hole-shaped first pivot portion 414 between the front end and the rear end. This first pivot portion 414 can provide a shaft member 42 to pass through the pivot, so that the two transmission rods The first pivot portion 414 of the rod 41 can be symmetrically coupled to the free ends of the existing two cranks 37A, 37B of the bicycle, and the rear end of the transmission rod 41 is located outside the rear wheel 31 of the bicycle;

The two auxiliary struts 44 each have opposite first ends and second ends, and the first ends are provided with hole-shaped assembly parts 441, so that the assembly portions 441 of the two auxiliary struts 44 can be fixed through the nuts respectively. , used to be fixedly connected to the two ends of the existing rear wheel shaft 311 of the bicycle. As for the second ends of the two auxiliary struts 44, they extend toward the rear of the bicycle rear wheel, and a shaft-shaped second pivot is connected to the second ends. 442;

The two guide rods 43 are symmetrically slidingly matched to the guide holes 411 of the two transmission rods 41, and a hole-shaped third pivot portion 431 is provided at the position protruding from the guide holes 411, so that the two guide rods 43 can be pivoted by the third pivot. 431 and symmetrically coupled to the second pivot 442 of the two auxiliary poles 44, and the lock ring 45 is sleeved on the second pivot 442 to restrict the third pivot 431 from the second pivot 442;

The two pedals 46 are symmetrically arranged in the adjustment holes 413 at the front ends of the two transmission rods 41. As shown in FIGS. The pivot part 414 is used as the fulcrum to swing, and the guide rod 43 can expand and contract along the guide hole 411, and can respond to the swing of the second and third pivot parts 442, 431 as the fulcrum. When 41 rotates, the central axis 33 and the remote auxiliary strut 44 can be effectively supported, so that the second crank 412 can further amplify the torque generated by the applied force of the pedal 46, so as to save effort on the existing transmission of the bicycle, so that It can save effort to drive the bicycle to travel. the

In summary, the present invention mainly forms a constraining chain structure through the overall cooperation of the cranks 37A, 37B, the transmission rod 41, the auxiliary support rod 44, the guide rod 43 and the rear wheel shaft 311. This overall structural configuration is really novel, and The pedal 46 can effectively support the central axis 33 and the remote auxiliary support rod 44 when the traction transmission rod 41 rotates, so the present invention is quite smooth and stable during operation, and has the advantages of easy assembly and low cost . the

The above-mentioned embodiments and drawings do not limit the form and style of the product of the present invention, and any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims (6)

1. the work-saving device of a bicycle, is characterized in that, includes:

Two drive links, it is provided with the first pivot section between front end and rear end, make two drive links can be with the first pivot section symmetrical be coupled to two existing crank free ends of bicycle, this drive link rear end is positioned at the bicycle rear outside, more the end face in this rear end is concaved with guide hole;

Two auxiliary poles, it has relative first end, the second end, and be provided with assembled portion in first end, make two auxiliary poles can be with assembled portion symmetrical be fixed in the existing hind axle two ends of bicycle, be to extend towards the bicycle rear rear as for two auxiliary pole the second ends, and be provided with the second pivot section in this second end;

Two guide bars, its symmetrical sliding guide hole that is assigned in two drive links, and be provided with the 3rd pivot section in the position of outstanding guide hole, make the second pivot section that is coupled to two auxiliary poles that two guide bars can be symmetrical with the 3rd pivot section;

Two pedals, its balanced configuration is in two drive link front ends, when both feet are trampled, drive link can be done with the first pivot section the swing of fulcrum, and guide bar can be flexible along guide hole, and the swing of making fulcrum with second and third pivot section in response to.

2. the work-saving device of bicycle as claimed in claim 1 is characterized in that: the drive link front interval is provided with some adjusting holes of installing for pedals.

3. as the work-saving device of claim 1 or 2 described bicycles, it is characterized in that: auxiliary pole is provided with poroid assembled portion in first end, this assembled portion can be solid through the spiral shell of nut, in order to be fixed in the existing hind axle two ends of bicycle, two auxiliary pole the second ends are connected to the second pivot section of an axle shape altogether; This guide bar is provided with poroid the 3rd pivot section, make two guide bars can be with the 3rd pivot section symmetrical the second pivot section that is coupled to two auxiliary poles.

4. the work-saving device of bicycle as claimed in claim 1 or 2 is characterized in that: the rectangle frame that drive link is an inner hollow is installed with an inner tube, with so that the end face shape of drive link rear end is concaved with a guide hole that is arranged coaxial in inside.

5. the work-saving device of bicycle as claimed in claim 4, it is characterized in that: drive link is extended with the second crank towards the front-wheel direction, and the second crank is interval with some adjusting holes of installing for pedals.

6. the work-saving device of bicycle as claimed in claim 1 or 2, it is characterized in that: the first pivot section of drive link is poroid, and the first pivot section can provide an axle part to wear pivot, and what make that the first pivot section of two drive links can be symmetrical is coupled to two existing crank free ends of bicycle.

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