JPH072161A - Bicycle - Google Patents

Abstract

PURPOSE:To facilitate running on an upward slope and to return A a pedal when ascending of a slope is completed by providing a shifting device compris ing a lock device to block rotation of a gear housing by means of a shift lever; and a reset mechanism to release a lock by stepping on a pedal. CONSTITUTION:A bicycle comprises a support body having a pair of left and right support levers 2a and 2b; a gear housing 6 supported through bearings 9a and 9b; left and right bevel gears 7a and 7b; a pinion 10 supported in a gear housing 6; and claw levers 33 and 34 to transmit a rotation power to a sprocket wheel 29 through a ratchet mechanism. A shifting mechanism is constituted such that, by operating the shift lever 20, rotation of the gear housing 6 is blocked by a gear housing lock mechanism; and by stepping on a pedal at an angle exceeding a specified angle, a reset plate 24 rotated integrally with either left or right crank shaft 5a or 5b causes release of the gear housing 6 from a lock with the aid of a reset mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle in which pedaling can be switched, and more specifically, the pedal can be normally rotated for normal traveling, but when climbing a hill, the left and right pedals are alternately turned in opposite directions. The present invention relates to a bicycle that can be rowed so as to rock.

[0002]

2. Description of the Related Art For a bicycle which is operated by changing the pedaling method when climbing a slope, Japanese Patent Application No. 57-
There is a bicycle of No. 43886 (Kokuhei 2-230),
By operating the switching lever forward and backward, this bicycle switches between a normal rowing method when traveling on a flat ground etc. and a rowing method where the pedal is alternately swung in the opposite direction when traveling uphill or the like. I am able to do it.

In this bicycle, it was necessary to return the switching lever at the time of climbing up a hill and return it based on how to pedal.

[0004]

According to the present invention, the pedal is normally rotated for rowing, but on the uphill, the left and right pedals can be alternately swung in the opposite direction by operating the switching lever. It is an object of the present invention to provide a bicycle that can be returned to normal running by simply depressing the pedal deeply after running uphill.

[0005]

In order to achieve the above-mentioned object, the bicycle of the present invention has a pair of left and right supporting rods which are attached to a frame of a bicycle and which independently support the crankshafts of the left and right pedals. The support body and the left and right side plates are penetrated by the opposite ends of the left and right crank shafts, and the gear housings are supported by bearings on both crank shafts, and the left and right crank shafts facing the inside of the gear housing are fixedly fitted to the opposite ends, respectively. The left and right bevel gears, which are engaged with the left and right bevel gears in the gear housing, and the pinion gears, whose journals are supported in the gear housing by bearings, are fixedly fitted to the left and right crankshafts, respectively, and through the ratchet mechanism. A claw rod that transmits rotational power to the sprocket wheel,
A gear housing lock mechanism provided on the support rod and the gear housing for preventing rotation of the gear housing by operating a switching lever; and a pedal provided on the support rod and the crankshaft for depressing a pedal beyond a certain angle. Accordingly, the reset plate that rotates integrally with either the left or right crankshaft is provided with a switching device that is a reset mechanism that unlocks the gear housing.

[0006]

When the vehicle is traveling normally, the gear housing is unlocked. For example, when the left pedal is depressed, the left bevel gear and the gear housing are rotated together with the left crank shaft. At this time, since the pinion gear in the gear housing rotates around the crankshaft together with the left bevel gear, the pinion gear does not rotate. Therefore, the right bevel gear is rotated in the same direction as the left bevel gear via the pinion gear, and the left and right pedals rotate in the same direction.

On the other hand, during switching traveling, the gear housing is locked by operating the switching lever to prevent rotation around the crankshaft. For example, when the left pedal is depressed to rotate the left bevel gear, the pinion gear in the gear housing is It is rotated by the left bevel gear and its rotational power is transmitted to the right bevel gear. At this time, since the rotation of the left bevel gear is reversed by the pinion gear and transmitted to the right bevel gear, the rotation directions thereof are opposite to each other.

Rotational power of the left and right crankshafts is transmitted to the rear wheels through a chain by rotating a sprocket wheel via a ratchet mechanism by a pawl rod fixedly fitted to each crankshaft.

When the user finishes climbing the slope, the reset plate provided on the crankshaft releases the lock of the gear housing by depressing either the left or right pedal, and the bicycle is returned to normal running.

[0010]

EXAMPLES Examples of a bicycle according to the present invention will be described below with reference to FIGS.
It will be described in detail based on. A support 2 having left and right support rods 2a and 2b is fixed to a top tube 1 which is a part of a bicycle frame.

The lower portions of the left and right support rods 2a, 2b independently support the left and right crank shafts 5a, 5b to which the cranks 4a, 4b of the left and right pedals 3a, 3b are fixedly fitted,
The opposite ends of the crankshafts 5a and 5b are supported by the crankshafts via bearings 9a and 9b.
The right and left side plates 6a and 6b are penetrated to face the inside of the housing, and bevel gears 7a and 7b are fixedly fitted to portions located inside the housing. The opposite ends of the left and right crankshafts support the inner end of the right crankshaft 5b by the bearing 8a in the cup 8 fixedly fitted to the inner end of the left crankshaft 5a.

A pinion gear 10 is meshed with the left and right bevel gears 7a and 7b, and a disc 11a fixed to a journal 11 of the pinion gear 10 with a nut is supported by a gear housing 6 by a bearing 12.

A large-diameter hub 13 is fixed to the left side plate 6a of the gear housing 6 so that it can rotate around the crankshaft 5a together with the gear housing. A notch 13a is provided on the outer circumference of the large-diameter hub 13 so that it can be engaged with the claw 14a of the outer latch 14 formed of a bell crank.

The outer latch 14 is supported by a shaft 15 provided on the left support rod 2a, and a tension spring 17 having one end fixed to the casing 16 causes the pawl 14a to engage with the notch 13a of the large diameter hub 13. The front branch 14b of the outer latch 14 is biased, and a cam 19 supported on a shaft 18 also provided on the left support rod 2a is brought into contact with the front branch 14b. Cam 19
Has a substantially rhombic shape, and the cam is rotated by the switching lever 20.

On the left side of the large-diameter hub 13, there is a left crankshaft 5a.
A small-diameter hub 21 fixed to the large-diameter hub 13 is provided on the outer circumference of the small-diameter hub.

The inner latch 22 is supported by a shaft 13b projecting from the left side surface of the large-diameter hub 13, and the front branch 22b is provided with a claw 22a capable of engaging with the cutout 21a of the small-diameter hub 21 and one end of which is large. The hook 22a is attached to the notch 21 of the small-diameter hub 21 by a tension spring 23 fixed to the left side surface of the large-diameter hub 13.
It is biased in the direction to engage with a.

The rear branch 22c of the inner latch 22 faces the side portion of the notch 13a of the large-diameter hub 13, and the outer latch 14
The rear branch 22c of the inner latch 22 is pushed in the crankshaft direction when the claw 14a of the inner latch 22 engages with the notch 13a of the large-diameter hub 13.

A reset plate 24 having a reset pin 24a at its outer end is fixed to the left side surface of the small-diameter hub 21 so that the reset plate 24 can rotate around the crankshaft 5a together with the small-diameter hub 21, and its mounting angle is left. The angle is the same as that of the crank 4a of the pedal 3a.

Below the crankshaft 5a, a bell crank 26 is supported by a shaft 25 provided on the left supporting rod 2a, and a front branch 26a of the bell crank 26 is connected to the cam 19 by a link 27, and Bell crank 26 rear branch 2
6b, the lowest point of its orbit is the reset pin 24 described above.
It has a length facing the orbit of a. Further, the base of the reset lever 28 is fixed to the cam 19, and the tip of the reset lever 28 has such a length as to face the orbit of the reset pin 24a.

Reference numeral 29 is a sprocket wheel for a chain having a conventional ratchet mechanism, which is rotatably provided on a right crankshaft 5b by a bearing 32 together with ratchet wheels 30 and 31 provided on both left and right sides thereof. The claw rod 33 formed integrally with the cup 8 and the claws 33a and 34a of the claw rod 34 having the base portion fixedly fitted to the right crankshaft 5b are engaged with the teeth provided on the outer periphery of the claws 31, 31. . The rotational power of this sprocket wheel is transmitted to the rear wheel sprocket 36 by the chain 35.

In this embodiment, one end of the wire 37 is connected to the tip of the switching lever 20 and the other end of the wire lever 39 is provided on the handle 38 via a guide ring 37a provided on the lower side of the top tube 1. The switch lever 20 can be operated at hand.

In the thus constructed bicycle of the present invention, normal traveling when traveling on a flat land or the like and switching traveling when traveling on an uphill are performed as follows.

<Normal Driving> On a flat ground or a gentle uphill, pedaling is performed as in a conventional bicycle. In this case, as shown in FIG.
7 pushes the front branch 14b of the outer latch 14 against the spring force of the outer latch 14, and the large-diameter hub 13 is released from the claw 14a of the outer latch 14, while the inner latch 22 urged by the tension spring 23 claws. Notch 21a of the small-diameter hub 21 due to 22a
Therefore, the large-diameter hub 13 and the gear housing 6 rotate integrally with the small-diameter hub 21, the left crankshaft 5a, and the left bevel gear 7a.

Therefore, the left bevel gear 7a cannot rotate the pinion gear, and the right bevel gear 7b is also integrally rotated in the same direction as the left bevel gear 7a. As a result, the left and right crankshafts 5a and 5b are integrally connected, and when the pedal is depressed, the left and right crankshafts are rotated together with the gear housing in the same direction, and the pedals are rotated in the same manner as a conventional bicycle. Can be run.

<Switching traveling> When approaching an uphill, the switching lever 20 is operated to the position shown in FIG. As a result, the outer latch 14 whose front branch 14b is pushed by the cam 19 is rotated by the spring force of the tension spring 17,
The notch 13a of the large diameter hub 13 is held by the claw 14a.
At this time, the pawl 14 a pushes down the rear branch 22 c of the inner latch 22 against the spring force of the tension spring 23, and the pawl 2 of the latch 22 is pressed.
2a is opened from the cutout 21a of the small diameter hub 21.

In this state, the gear housing 6 is locked together with the large-diameter hub 13 and cannot rotate. For example, when the left crank shaft 5a is rotated by the left pedal 3a, the left bevel gear 7a rotates the pinion gear 10 and the right bevel gear 7b. Is transmitted to the right crankshaft 5b via the pinion gear 10 and rotates in the opposite direction to the left crankshaft.

Therefore, when the left pedal is depressed to rotate it downward to the front, the right pedal is reversely rotated upward to the front, and then the raised right pedal is depressed to move the left and right pedals as shown in FIG. You can swing the bicycle alternately and you can climb a slope much easier than a conventional bicycle.

When the switching lever 20 is operated to rotate the cam 19, the reset lever 28 attached to the cam 19 is rotated.
And the rear branch 26b of the bell crank 26, which is connected to the cam 19 by the link 27, is projected onto the orbit of the reset pin 24a of the reset plate 24,000. When these are pushed back to the original position by the reset pin 24a of the reset plate 24, the housing is unlocked and the bicycle is returned to normal running.

When the left pedal 3a is depressed to the lowest point, the reset pin 24 of the reset plate 24, which is fixed to the left crank shaft 5a and rotates at the same angle as the crank 4a of the left pedal, lowers the left crank shaft 5a. Bell crank 26
The rear branch 26b is pushed rearward, and the front branch 26a of the bell crank 26 causes the cam 19 to rotate in the unlocking direction via the link 27. Thus, the outer latch 14 is pushed by the cam 19 and unlocks the gear housing 6, thereby returning the bicycle to normal running.

When the right pedal 3b is depressed to the lowest point, the left pedal at the time of switching travel is raised in front of the crankshaft,
The reset pin 24a of the reset plate 24 fixed to the left crankshaft 5a pushes up the reset bar 28 attached to the cam 19 to rotate the cam 19 in the unlocking direction of the housing 6, and the bicycle is returned to normal running. .

The hand lever 3 provided on the handle 38
If 9 is provided next to a bell (not shown) and the reset hand lever makes the bell ring when returning from the switching run to the normal run, the rider is notified by the bell warning sound that the normal run has been returned. be able to.

[0032]

The bicycle according to the present invention has the following effects. (1) By operating the switching lever, the left and right pedals can be stepped on alternately to row, so that the pedaling force can be effectively utilized and the uphill traveling becomes easier. (2) The lock release mechanism of the gear housing allows you to return to normal running by simply depressing either the left or right pedal deeply at the end of climbing.

[Brief description of drawings]

FIG. 1 is a side view showing a bicycle of the present invention.

FIG. 2 is a partially enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a side view showing a housing lock mechanism and a lock release mechanism during normal traveling.

FIG. 4 is a side view showing a housing lock mechanism and a lock release mechanism during switching traveling.

FIG. 5 is a side view showing a state of left and right pedals during switching traveling.

[Explanation of symbols]

 1 top tube 2 support 2a, 2b support rod 3a, 3b pedal 4a, 4b crank 5a, 5b crankshaft 6 gear housing 7a, 7b bevel gear 8 cup 9a, 9b bearing 10 pinion gear 11 journal 12 bearing 13 large diameter hub 14 outside Latch 16 Casing 17, 23 Tension spring 19 Cam 20 Switching lever 21 Small hub 22 Inner latch 24 Reset plate 24a Reset pin 26 Bell crank 27 Link 28 Reset lever 29 Sprocket wheel 30, 31 Claw wheel 33, 34 Claw rod 35 Chain 36 Rear Wheel sprocket

Claims (1)

[Claims] 1. A. A support attached to a bicycle frame and having a pair of left and right support rods for independently supporting the crankshafts of the left and right pedals b. A gear housing in which the opposite ends of the left and right crankshafts pass through the left and right side plates and are supported by both crankshafts via bearings. C. Left and right bevel gears fixedly attached to opposite ends of the left and right crankshafts facing the gear housing d. A pinion gear that meshes with the left and right bevel gears in the gear housing, and a journal is supported in the gear housing by bearings e. A pawl rod that is fixedly fitted to each of the left and right crank shafts and that transmits rotational power to the sprocket wheel via a ratchet mechanism f. A gear housing lock mechanism which is provided on the support rod and the gear housing and prevents the gear housing from rotating by operating the switching lever. G. A reset mechanism that is provided on the support rod and the crank shaft and that releases the lock of the gear housing by a reset plate that rotates integrally with one of the left and right crank shafts by depressing the pedal over a certain angle. A bicycle equipped with a switching device configured by g.