JP4733681B2 - bicycle - Google Patents

Description

  The present invention relates to a bicycle.

Conventionally, a bicycle has a chain between a free wheel (small gear) on the rear wheel and a chain wheel (large gear) to which the crank is attached, and the crank is rotated by a pedal provided at the tip of the crank. Although it is driven and driven, there are dead points near the upper and lower limits of the crank, and it is extremely difficult to effectively apply the leg force near the dead point, and the loss of force is large, so the propulsive force is intermittent and efficient. It was bad.
In order to solve such a problem, Patent Document 1 discloses a bicycle of a type in which the left and right two lever cages having a pedal at the tip are alternately swung up and down to drive the rear wheels.
In this lever-driven bicycle, the base end portion is rotatably supported on the inner shaft of the rear wheel, and a pair of left and right lever rods having a pedal at the front end portion are pulled by a cable straddling the vehicle body. Drives to rotate the hook wheel through a ratchet by a small angle by swinging the lever cage up and down and to transmit the rotation of the hook wheel to the rear wheel through a speed increasing gear train formed by combining large and small gears. The mechanism is provided on both the left and right sides of the vehicle body, and the left and right lever cages are alternately swung up and down alternately via a pedal, thereby increasing the rotation of the ratchet wheel and rotating the rear wheels in the forward direction.
As a result, in the stroke between the top and bottom dead centers of the lever cage, the force of stepping on the pedal effectively and averagely acts on the propulsive force, and the efficiency of the force is improved, compared with the crank drive type bicycle. did it.
JP-A 49-32333

However, since the above-mentioned lever-driven bicycle is equipped with a speed increasing gear train in its drive mechanism, there is a problem that the transmission efficiency of the force is lowered and the burden on the foot of the pedal is increased. ing.
In addition, when the left and right levers provided with pedals are alternately swung up and down, the cable connecting the levers to each other is always in frictional contact with the support guide at the same location. If the cable generates heat due to the friction and touches the rider's body, there is a risk of burning, and the frictional heat will cause the cable itself to expand due to thermal expansion, which may interfere with the swinging operation of the lever cage, or due to long-term use. There is also a problem of tearing during running due to wear.
Therefore, the present invention improves the force transmission efficiency to reduce the burden on the rider and always performs a stepping operation for driving the rear wheels by strengthening the means for connecting the left and right lever cages each provided with a pedal. An object is to provide a bicycle that can be stably and satisfactorily performed.

  In view of the above problems, the bicycle according to the first aspect of the present invention has a vehicle body frame in which the base ends of the first and second cranks are pivotally mounted on the upper and lower sides of a standing pipe provided with a saddle at the upper end, and the middle of the first crank. And a distal end portion of the second crank are pivotally connected by a crank connecting rod, and a base end portion of an insulator rod provided with a pedal is pivotally attached to the distal end portion of the second crank. The pedal link mechanism that is pivotally connected to the front end of the first crank is connected symmetrically to the left and right of the vertical pipe. The right pedal link mechanism has the second crank on its axis from the base end. An extension rod projecting rearwardly, and the tip of the extension rod is pivotally attached to one end portion of a pivot crossing the lower part of the vehicle body frame. The other end of the pivot shaft and the first pedal link mechanism portion Connect the tip of the rod with the base end pivotally connected to the shaft by connecting the joint. In addition, a double-acting link mechanism formed by pivotally connecting a pivotally connecting portion between the rod and the connecting rod and a pivoting portion between the lever rod and the crank connecting rod on the second crank with a supporting rod, Each pedal link mechanism is linked so that the pedals move up and down alternately, large gears are attached to the left and right first crankshafts, and only forward rotation is transmitted to the left and right ends of the rear wheel shafts. A small gear with a built-in one-way clutch is attached to the shaft, and a chain is spanned between the left and right large gears and small gears.

  According to a second aspect of the present invention, there is provided a bicycle according to a second aspect of the present invention, wherein the base end portions of the first and second cranks are pivotally mounted on the upper and lower sides of a standing pipe provided with a saddle at the upper end of the body frame. The middle part of the lever is pivotally connected by a crank connecting rod, and the base end portion of the lever rod provided with a pedal is pivotally attached to the tip portion of the first crank. Pedal link mechanism part that is pivotally connected to the part by a joint is arranged symmetrically on the left and right of the vertical pipe, and the right pedal link mechanism part extends backward from the base end to the second crank for the second crank A hook is protruded, and the distal end of the extension rod is pivotally attached to one end of a pivot crossing the lower part of the vehicle body frame. The other end of the pivot and the left pedal link mechanism portion are provided with a lever rod and a crank in the first crank. It is composed of multiple joints which are connected to the articulated part of the articulated joint with the support joint. The link mechanism unit connects the pedal link mechanism units so that the left and right pedals move up and down alternately, and a large gear is attached to each of the left and right first crankshafts, and at the left and right ends of the rear wheel shafts, respectively. A small gear with a built-in one-way clutch that transmits only rotation in the forward direction is attached to a shaft, and a chain is spanned between the large and small gears on the left and right.

  According to a third aspect of the present invention, there is provided a bicycle according to a third aspect of the present invention, wherein a base end portion of a lever rod provided with a pedal is pivotally mounted above a standing pipe provided with a saddle at an upper end in a body frame, and a crank base is provided below the standing pipe. The pedal link mechanism, which is pivotally attached to the end and pivotally connected to the end of the lever rod and the tip of the crank by a crank connecting rod, is arranged symmetrically on the right and left of the vertical pipe. An extension rod projecting from the base end to the rear of the axis is provided on the crank, and the distal end portion of the extension rod is pivotally attached to one end portion of a pivot crossing the lower part of the vehicle body frame. In the left pedal link mechanism section, each pedal is moved so that the left and right pedals move up and down alternately by a double-action link mechanism section formed by pivotally connecting the pivot joint section of the lever joint to the crank joint joint with a support rod. Linking the link mechanism, left and right clan A large gear is attached to each of the shafts, and a small gear with a built-in one-way clutch that transmits only rotation in the forward direction is attached to each of the left and right ends of the rear wheel shaft. It is characterized by having a chain.

  According to a fourth aspect of the present invention, there is provided a bicycle according to a fourth aspect of the present invention, wherein a base end portion of a lever rod provided with a pedal is pivotally attached to each of the left and right upper portions of a standing pipe provided with a saddle at the upper end in a body frame. The base end of the crank is pivoted downward, and the tip of the right lever rod and the tip of the crank are pivotally connected by a crank connecting rod. The crank extends backward from the base end of the axis. Projection is provided, and the tip of the extension rod is pivotally attached to one end of the pivot crossing the lower part of the body frame, and the other end of the pivot and the tip of the left lever cage are pivoted by a support rod. The double-action link mechanism that is connected to each other connects the levers so that the left and right pedals move up and down alternately, and attaches a large gear to each of the base shafts of the left and right levers. A small gear with a built-in one-way clutch that transmits only forward rotation to the left and right ends of the axle. Wear and, characterized in that it passed over the chain to the left and right respectively large gear and a small gear.

According to the present invention, a pedal link mechanism portion formed by assembling a lever rod provided with the pedal or various links including the lever rod provided with the pedal so that the pedal moves up and down on the left and right of the standing pipe in the vehicle body frame. And the left and right lever cages directly or the left and right pedal link mechanism part is a double-action link mechanism part that is separately assembled with various links as described above. Because it is linked, the linkage between the left and right lever cages with pedals can be strengthened compared to conventional products, and the alternate stepping operation of the pedals for driving the rear wheels can always be performed stably and satisfactorily .
In addition, the left and right large gears that reciprocate the rotation angle by the swinging operation of the left and right lever cages, and the one-way clutch that is attached to both the left and right ends of the rear wheel shaft and transmits only the forward rotation are incorporated. By hanging the chain between the left and right small gears, the reciprocating motion of the large gear rotation angle is transmitted to the small gears at the same time, and at the same time, only the forward rotation can be transmitted to the rear wheels by the one-way clutch.
Therefore, by repeating the vertical movement of the left and right pedals, the rear wheels can rotate in the forward direction without interruption, and the bicycle can be smoothly advanced. The leg force acts effectively and on average, and the practical effect is great, such as improving the power transmission efficiency and reducing the burden on the rider.

An embodiment of the present invention will be described below with reference to the drawings.
1 is a left side view of a bicycle according to the present invention, FIG. 2 is a left side view when left and right pedals are arranged at the same height position, FIG. 3 is an enlarged view of a partly broken main portion of FIG. FIG. 5 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 6 is a cross-sectional view taken along the line BB in FIG.
This bicycle is mainly composed of a body frame 3 including a handle 1, a saddle 2 and the like, a front wheel 4 and a rear wheel 5, and a driving device 7 including pedals 6 and 6a. Details are omitted.

The vehicle body frame 3 includes a standing pipe 9 in a rearward-facing posture in which a seat post 8 protruding from the bottom of the saddle 2 is inserted and supported at the upper end, and a front fork 10 that rotatably supports the front wheel 4 in front of the standing pipe 9. And a head tube 11 that rotatably supports the steering wheel 1 that steers the front fork 10, an upper pipe 12 and a lower pipe 13 that are installed between the head tube 11 and the standing pipe 9, and left and right sides of the standing pipe 9, respectively. The stays 14 and 14a extend from the rear to the rear in a substantially square shape and rotatably support the rear wheel 5 between the apex corners.
In the illustrated example, the saddle 2 is provided with a backrest 2a, but it may be a conventional saddle without a backrest.

  The drive device 7 is assembled to the pedal link mechanism sections 15 and 15a so that the pedal link mechanisms 15 and 15a assembled to move the pedals 6 and 6a up and down and the vertical movements of the pedals 6 and 6a are alternately linked. The double-action link mechanism 16 and the transmission mechanism 17 that converts the vertical movement of the pedals 6 and 6a into a rotational angular reciprocating motion (constant angular reciprocating swing) and transmits only the forward rotation to the rear wheel 5. It is composed.

The pedal link mechanism portions 15 and 15a have the same basic configuration and are symmetrically arranged on the left and right of the standing pipe 9, and the configuration will be described in detail below.
The pedal link mechanism portions 15 and 15a are arranged at the upper and lower positions of the vertical pipe 9, that is, at the intermediate portion and the lower end portion, respectively, at the base ends of the first cranks 18 and 18a bent upward and the second cranks 19 and 19a. The base end of is pivotally attached.
The middle portions (bent portions) of the first cranks 18 and 18a and the tip portions of the second cranks 19 and 19a are pivotally connected by crank connecting rods 20 and 20a.
Further, the base ends of the lever rods 21 and 21a provided with the pedals 6 and 6a are pivotally attached to the distal end portions of the second cranks 19 and 19a (the pivot joint portions with the crank connecting rods 20 and 20a). The tip portions of 21 and 21a and the tip portions of the first cranks 18 and 18a are pivotally connected by linkages 22 and 22a.

  In the vertical pipe 9, a cylindrical bracket 23 orthogonal to the axis of the vertical pipe 9 is provided at a portion where the first cranks 18 and 18 a and the second cranks 19 and 19 a of the pedal link mechanism portions 15 and 15 a are pivotally attached. , 23a, and the brackets 23, 23a support the first and second crank shafts 24, 24a, 25, 25a of the first and second cranks 18, 18a, 19, 19a individually and rotatably. Bearings 26, 26a, 27, 27a are installed (see FIG. 6).

  The pedals 6 and 6a extend forward at a predetermined angle from the front ends of the lever rods 21 and 21a, and are widened outward from the lever rods 21 and 21a so that the feet of the rider D can be placed as shown in FIG. However, a conventional pedal may be attached to the outside without widening in this way, and the levers 21 and 21a may be installed even if they do not extend further forward than the front ends of the levers 21 and 21a. Alternatively, a front pedal may be attached to the front end or a portion near the front end of the lever cage 21, 21a.

Further, only in the right pedal link mechanism portion 15a, the second crank 19a is provided with an extension rod 28 protruding rearward on the axis thereof from the base end portion.
The distal end of the extension rod 28 is pivotally attached to one end of a pivot 29 that crosses the lower part of the vehicle body frame 3 (stays 14 and 14a), and the first end of the pivot 29 and the left pedal link mechanism 15 The tip end of the rod 30 pivotally attached to the crankshaft 24 is pivotally connected by a connecting hanging rod 31, the pivoting portion of the rod 30 and the connecting hanging rod 31, and the lever in the second crank 19 A double-acting link mechanism 16 is constructed by pivotally connecting the pivot 21 (the tip of the second crank 19) to the flange 21 and the crank connecting rod 20 with a support rod 32, thereby forming the double-acting mechanism section. 16, the left and right pedal link mechanism portions 15 and 15a are connected to each other, and the pedals 6 and 6a are set to move up and down alternately.

As described above, the pedals 6 and 6a that are alternately movable up and down are provided with means for restricting the upper limit and lower limit positions thereof.
Specifically, a stopper 33 that abuts on the upper edge of the first cranks 18 and 18a in a tilted posture when the pedals 6 and 6a are set to the upper limit position is disposed on the upper front portion of the vertical pipe 9. Can do.

  The transmission mechanism 17 has large gears 34 and 34a formed of sprockets attached to the left and right outer ends of the left and right first crankshafts 24 and 24a, respectively, and is advanced to the left and right outer ends of the axle 5a in the rear wheel 5. A small gear (free wheel) 35, 35a having a built-in one-way clutch (not shown) that transmits only the rotation in the direction is attached to a shaft, and a chain 36 is attached to each of the left and right large gears 34, 34a and the small gears 35, 35a. It is configured by passing 36a.

Next, a second embodiment, which is a modification of the above embodiment (hereinafter referred to as the first embodiment), will be described with reference to FIGS.
In this bicycle, the pedal link mechanism portions 15 and 15a and the double-acting link mechanism portion 16 in the driving device 7 of the first embodiment are deformed, and the body frame 3 is deformed in accordance with such deformation, and is the same as described above. Or, equivalent parts are denoted by the same reference numerals in the drawing, and description thereof is omitted.
The pedal link mechanism portions 15 and 15a are symmetrically arranged on the left and right of the standing pipe 9 with the same basic configuration as described above.
Then, the base ends of the first cranks 18 and 18a and the second cranks 19 and 19a are pivotally attached to the upper and lower intermediate portions and the lower end portions of the vertical pipe 9, respectively. The second cranks 19 and 19a are pivotally connected to a midway portion near the tip by crank connecting rods 20 and 20a.
Further, the base ends of the lever rods 21 and 21a provided with the pedals 6 and 6a are pivotally attached to the distal ends of the first cranks 18 and 18a (the pivotally connected portions with the crank connecting rods 20 and 20a). The tip portions of 21 and 21a and the tip portions of the second cranks 19 and 19a are pivotally connected by linkages 22 and 22a.

  The pedals 6 and 6a are extended from the front ends of the lever rods 21 and 21a to the front on the axis thereof, and outside the lever rods 21 and 21a so that the feet of the rider D can be placed in the same manner as in the first embodiment. However, it does not need to be widened in this way, a conventional pedal may be attached to the outside, and the lever is not required to extend further forward than the distal ends of the levers 21, 21a. It may be provided so as to project at a suitable position outside the 21 and 21a, or a front pedal may be attached to the distal end or the portion near the distal end on the outer side of the lever cage 21 or 21a.

Also in the second embodiment, as in the first embodiment, the second crank 19a in the right pedal link mechanism portion 15a is provided with an extending rod 28 projecting rearward on the axis from the base end portion.
The distal end of the extension rod 28 is pivotally attached to one end of a pivot 29 that crosses the lower part of the vehicle body frame 3 (stays 14 and 14a), and the first end of the pivot 29 and the left pedal link mechanism 15 A double-acting link mechanism portion 16 is constructed by pivotally connecting the lever rod 21 and the crank connecting rod 20 of the crank 18 to the crank connecting portion 20 (the tip portion of the first crank 18) with a support rod 32. The double-action link mechanism 16 connects the left and right pedal link mechanisms 15 and 15a so that the pedals 6 and 6a are alternately moved up and down.

The vehicle body frame 3 has basically the same configuration as that of the first embodiment, but the stay 14 is provided so that the pivot 29 of the double-action link mechanism 16 that operates in accordance with the vertical movement of the pedals 6 and 6a does not contact. 14a, the mounting position of the lower heel base end with respect to the standing pipe 9 is changed upward, and the mounting positions of the upper and lower pipes 12, 13 with respect to the standing pipe 9 are also changed upward with the change of the stays 14, 14a. .
As a result, the lower part of the upright pipe 9 protrudes downward from the body frame 3 (see FIGS. 7 and 8).

Next, a third embodiment will be described with reference to FIGS.
This bicycle is mainly a modification of the pedal link mechanism portions 15 and 15a in the driving device 7 of the second embodiment. The same or corresponding parts are denoted by the same reference numerals in the drawing, and the description will be omitted. Omitted.
The pedal link mechanism portions 15 and 15a are symmetrically arranged on the left and right of the standing pipe 9 with the same basic configuration as described above.
Then, the base end portions of the lever rods 21 and 21a provided with the pedals 6 and 6a are pivotally attached to the intermediate portion above the standing pipe 9, and the cranks 19 and 19a are disposed at the lower end portion below the standing pipe 9. The distal ends of the lever rods 21 and 21a and the distal ends of the cranks 19 and 19a are pivotally connected by crank connecting rods 20 and 20a.
In the drawing, for convenience, reference numerals 24 and 24a are attached to the base end shafts of the lever rods 21 and 21a.

  Similarly to the second embodiment, the pedals 6 and 6a extend forward from the front end portions of the lever rods 21 and 21a on the axis thereof, and outside the lever rods 21 and 21a so that the feet of the rider D can be placed thereon. However, without widening in this way, a conventional pedal may be attached to the outside, or it may be provided at an appropriate position outside the insulator rods 21 and 21a, or outside the insulator rods 21 and 21a. A front pedal may be attached at the front end or near the front end.

Also in the third embodiment, as in the first and second embodiments, the crank 19a in the right pedal link mechanism portion 15a has an extending rod 28 projecting rearward on the axis thereof from the base end portion.
The distal end of the extension rod 28 is pivotally attached to one end portion of the pivot 29 that crosses the lower part of the vehicle body frame 3 (stays 14 and 14a), and the other end of the pivot 29 and the left pedal link mechanism portion 15 The double-acting link mechanism 16 is constructed by pivotally connecting the pivot connecting part (the tip part of the insulator 21) with the crank connecting rod 20 in 21 by a support rod 32. Thus, the left and right pedal link mechanism portions 15 and 15a are connected to each other, and the pedals 6 and 6a are alternately moved up and down.

  The vehicle body frame 3 is basically formed in the same manner as in the second embodiment, and the stays 14 and 14a are prevented from contacting the pivot 29 of the double-action link mechanism 16 that operates as the pedals 6 and 6a move up and down. The upper base is attached to the vertical pipe 9 at the base end of the lower collar.

  The transmission mechanism 17 is formed by axially attaching large gears 34, 34a made of sprockets to the left and right outer ends of the left and right crankshafts 25, 25a, and the other configurations are the same as in the first and second embodiments.

Next, a fourth embodiment will be described with reference to FIGS.
This bicycle uses the body frame 3 having the same configuration as that of the third embodiment, and the double-action link mechanism portion 16 is directly connected to the lever rods 21 and 21a in the driving device 7 of the third embodiment. The same or corresponding parts are denoted by the same reference numerals in the drawing, and description thereof is omitted.
Therefore, as in the third embodiment, the lever rods 21 and 21a provided with the pedals 6 and 6a are pivotally attached to the left and right upper portions of the standing pipe 9 in the vehicle body frame 3, respectively. is doing.

  Then, the base end portion of the crank 19a is pivotally connected to the lower right side of the standing pipe 9, and the distal end portion of the right insulator rod 21a and the distal end portion of the crank 19a are pivotally connected by a crank connecting rod 20a to be connected to the crank 19a. Extends from the base end to the rear on the axis, and the distal end of the extension rod 28 is pivotally attached to one end of the pivot 29 that crosses the lower part of the vehicle body frame 3 (stays 14 and 14a). The other end of the pivot shaft 29 and the tip of the left side lever rod 21 are pivotally connected by a support rod 32 to form a double-action link mechanism portion 16. The lever rods 21 and 21a are connected to each other, and the left and right pedals 6 and 6a extending forward from the front ends of the respective rod rods 21 and 21a are set to move up and down alternately.

  The transmission mechanism 17 is formed by axially attaching large gears 34, 34a made of sprockets to the left and right outer ends of the base end shafts 24, 24a of the left and right lever rods 21, 21a, and the other configurations are the same as those in the above embodiments. It is the same.

In the bicycle according to the first embodiment configured as described above, when the rider D steps down one pedal 6, the lever 21 provided with the pedal 6 swings downward, and in conjunction with this, The pedal link mechanism 15 moves downward with the first and second crankshafts 24 and 25 as fulcrums.
Due to the downward movement of the pedal link mechanism portion 15, the rod 30 swings downward via the support rod 32 of the double-action link mechanism portion 16 and pushes down the articulated rod 31.
As a result, the extension rod 28 swings downward via the pivot 29, so that the other second crank 19a swings upward, and the pedal link mechanism 15a is linked to the first and second crankshafts in conjunction with this. Since the pedals 24a and 25a are moved up as fulcrums, the other pedal 6a is moved up.
Then, when the pedal 6a is depressed downward, the pedal 6 is moved up in the reverse procedure to the above, and the pedals 6, 6a are alternately depressed in this manner, so that the first crankshafts 24, 24a are moved. The shaft-mounted large gears 34 and 34a are reciprocated at a rotational angle (reciprocal rocking at a constant angle), and the reciprocating motion of the rotational angle is transmitted to the small gears 35 and 35a via the chains 36 and 36a. Since only the forward rotation is transmitted to the rear wheel shaft 5a by the one-way clutch built in 35, 35a, the bicycle moves forward by the rotation of the rear wheel 5.

Even in the bicycle of the second embodiment, when the rider D depresses one of the pedals 6, the lever 21 provided with the pedal 6 swings downward, and the pedal link is linked to this. The mechanism 15 moves downward with the first and second crankshafts 24 and 25 as fulcrums.
The downward movement of the pedal link mechanism 15 causes the support rod 32 of the double-action link mechanism portion 16 to swing the extension rod 28 downward via the pivot 29, so that the other second crank 19a swings upward, In conjunction with this, the pedal link mechanism 15a moves upward with the first and second crankshafts 24a, 25a as fulcrums, so the other pedal 6a moves upward.
Then, by depressing the pedal 6a downward, the pedal 6 is moved up in the reverse procedure to the above, and by depressing the pedals 6 and 6a alternately in this way, the same as in the first embodiment. The large gears 34 and 34a mounted on the crankshafts 24 and 24a are reciprocated at a rotational angle (reciprocal swing at a constant angle), and the reciprocating motion of the rotational angles is transmitted to the small gears 35 and 35a via the chains 36 and 36a. However, since only the forward rotation is transmitted to the rear wheel shaft 5a by the one-way clutch built in the small gears 35, 35a, the bicycle moves forward by the rotation of the rear wheel 5.

In the bicycle of the third embodiment, when the rider D depresses one of the pedals 6, the lever rod 21 provided with the pedal 6 swings downward, and the pedal link mechanism portion 15 is linked with the lever. The shaft 21 moves downward with the base shaft 24 and the crankshaft 25 as fulcrums.
The downward movement of the pedal link mechanism 15 causes the support rod 32 of the double-action link mechanism portion 16 to swing the extension rod 28 downward via the pivot 29, so that the other crank 19a swings upward. In conjunction with this, the pedal link mechanism 15a moves upward with the base shaft 24a and the crankshaft 25a of the lever rod 21a as fulcrums, so the other pedal 6a moves upward.
Then, when the pedal 6a is depressed downward, the pedal 6 is moved up in the reverse procedure to the above, and the pedals 6, 6a are alternately depressed in this manner, so that the crankshafts 25, 25a are attached to the crankshafts 25, 25a. The large gears 34, 34a are rotated and reciprocated at a rotational angle (reciprocating at a constant angle), and this rotational angular reciprocation is transmitted to the small gears 35 and 35a via the chains 36 and 36a. Since only the forward rotation is transmitted to the rear wheel shaft 5a by the one-way clutch built in 35a, the bicycle moves forward by the rotation of the rear wheel 5.

Further, in the bicycle of the fourth embodiment, when the rider D depresses one of the pedals 6, the lever rod 21 provided with the pedal 6 swings downward with its base end shaft 24 as a fulcrum. In conjunction with this, the support rod 32 of the double-action link mechanism portion 16 swings the extension rod 28 downward via the pivot 29.
As a result, the crank 19a swings upward, and the crank connecting rod 20a interlocking with the crank 19a swings the lever rod 21a upward with its base end shaft 24a as a fulcrum, so that the other pedal 6a moves upward. .
Then, when the pedal 6a is depressed downward, the pedal 6 is moved up in the reverse procedure to the above, and when the pedals 6 and 6a are alternately depressed in this manner, the base ends of the levers 21, 21a The large gears 34, 34a mounted on the shafts 24, 24a are reciprocated at a rotational angle (reciprocal rocking at a constant angle), and the reciprocating rotational angles are transmitted to the small gears 35, 35a via the chains 36, 36a. However, since only the forward rotation is transmitted to the rear wheel shaft 5a by the one-way clutch built in the small gears 35 and 35a, the bicycle moves forward by the rotation of the rear wheel 5.

It is a left view of the bicycle of the first embodiment. It is a left view when the left and right pedals are arranged at the same height position. It is a partially broken principal part enlarged view of FIG. It is a figure which shows the other side of FIG. FIG. 3 is a cross-sectional view taken along a line AA in FIG. 2. FIG. 3 is a partially omitted BB cross-sectional view of FIG. 2. It is a left view which shows the bicycle of a 2nd Example. It is a left view when the left pedal is arranged at the lower limit position. It is a partially broken principal part enlarged view of FIG. It is a figure which shows the other side of FIG. It is a left view which shows the bicycle of 3rd Example. It is a left view when the left pedal is arranged at the lower limit position. FIG. 12 is an enlarged view of a partly broken main portion of FIG. FIG. 14 is a diagram showing the opposite side of FIG. It is a left view which shows the bicycle of 4th Example. It is a left view when the left pedal is arranged at the lower limit position. FIG. 16 is an enlarged view of a partly broken main portion of FIG. FIG. 18 is a view showing the opposite side of FIG.

Explanation of symbols

2 Saddle 3 Body frame
5a Rear axle 6, 6a Pedal 9 Vertical pipe
15, 15a Pedal link mechanism
16 Double acting link mechanism
18, 18a First crank
19, 19a (2nd) Crank
20, 20a Crank articulated rod
21, 21a
22, 22a
24, 24a First crankshaft (base shaft)
25, 25a Crankshaft
28 Extension
29 Axis
30 槓杆
31 articulated spear
32 Support rod
34, 34a Large gear
35, 35a Small gear
36, 36a chain

Claims (4)

  The base ends of the first and second cranks are pivotally mounted on the top and bottom of a vertical pipe with a saddle at the upper end of the body frame, and the middle part of the first crank and the tip part of the second crank are connected by a crank connecting rod. Pivotally connected, the base end of the lever rod provided with a pedal is pivotally connected to the tip of the second crank, and the tip of the lever rod and the tip of the first crank are linked together. The pedal link mechanism portion is arranged symmetrically on the left and right of the vertical pipe. In the right pedal link mechanism portion, the second crank is provided with an extension rod projecting rearward on the axis from the base end portion. Is pivotally attached to one end of a pivot crossing the lower part of the vehicle body frame, and the other end of the pivot is connected to the distal end of the saddle pivotally attached to the first crankshaft in the left pedal link mechanism. In addition to being pivotally connected by the articulated spear, the articulated portion of the spear and the articulated spear and the second class Each pedal link mechanism is linked so that the left and right pedals move up and down alternately by a double-action link mechanism that is pivotally connected to the lever and the pivot joint of the crank. A large gear is attached to each of the left and right first crankshafts, and a small gear incorporating a one-way clutch that transmits only forward rotation is attached to each of the left and right ends of the rear wheel shafts. A bicycle that has a chain spanned between a large gear and a small gear.   The base end of the first and second cranks are pivotally mounted on the top and bottom of the vertical pipe with the saddle at the upper end of the body frame, and the leading end of the first crank and the middle part of the second crank are connected by a crank connecting rod. Pivotally connected, pivoting the base end of the lever with a pedal to the tip of the first crank, and connecting the tip of the lever with the tip of the second crank The pedal link mechanism portion is arranged symmetrically on the left and right of the vertical pipe. In the right pedal link mechanism portion, the second crank is provided with an extension rod projecting rearward on the axis from the base end portion. Is pivotally attached to one end of the pivot crossing the lower part of the vehicle body frame, and the other end of the pivot is supported by the left pedal link mechanism and the pivot joint of the lever crank and the crank connecting rod in the first crank. The double-acting link mechanism, which is pivotally connected by a saddle, Each pedal link mechanism is linked so that the cylinders move up and down alternately, large gears are attached to the left and right first crankshafts, and only forward rotation is transmitted to the left and right ends of the rear wheel shafts. A bicycle characterized by having a small gear with a built-in one-way clutch attached to a shaft and a chain between the large and small gears on the left and right.   In the body frame, a base end portion of a lever rod provided with a pedal is pivoted above a vertical pipe provided with a saddle at the upper end, and a base end portion of a crank is pivotally mounted below the vertical pipe. The pedal link mechanism part, which is pivotally connected to the front end part and the front end part of the crank by a crank connecting rod, is arranged symmetrically on the left and right sides of the standing pipe. In the right pedal link mechanism part, the crank is on its axis from the base end part. The extension rod protrudes rearwardly, and the tip of the extension rod is pivotally attached to one end portion of the pivot crossing the lower part of the vehicle body frame. The other end portion of the pivot shaft and the left pedal link mechanism portion With the double-action link mechanism that is pivotally connected to the pivot joint with the crank joint by the support rod, each pedal link mechanism is linked so that the left and right pedals move up and down alternately. If you attach a large gear to each of the shafts In addition, a small gear with a built-in one-way clutch that transmits only rotation in the forward direction is attached to each of the left and right ends of the rear wheel shaft, and a chain is spanned between the large gear and the small gear on each of the left and right sides. bicycle. In the body frame, the base end of a lever cage provided with a pedal is pivotally attached to the left and right upper parts of the standpipe provided with a saddle at the upper end, and the base end of the crank is pivotally attached to the lower right side of the standpipe. At the same time, the distal end portion of the right-hand side lever rod and the distal end portion of the crank are pivotally connected by a crank connecting rod, and an extended rod projecting from the base end portion to the rear of the axis is provided on the crank. A double-acting link mechanism that is pivotally connected to one end of a pivot that crosses the lower part of the vehicle body frame, and the other end of the pivot is pivotally connected to the tip of the left-hand lever by a support rod. Thus, the left and right pedals are alternately moved up and down, and the levers are linked to each other, and a large gear is attached to each of the base shafts of the left and right levers, and the left and right ends of the rear wheel shaft are respectively moved in the forward direction. A small gear with a built-in one-way clutch that transmits rotation only is attached to the shaft. Bicycle, characterized in that it passed over the chain.

Images