JP2009073364A - Pedal shaft joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pedal shaft joint structure capable of simplifying the structure of its lock member, eliminating the risk of an incorrect operation or damage, and being easily attached and detached. <P>SOLUTION: The pedal shaft joint structure allows a pedal shaft 22 to be releasably attached to a crank member 10 via a pedal shaft attaching member 30 in a single operation, wherein one plate-like lock member 50 with a lock hole 54 formed therein, which can be freely engaged with and disengaged from a lock peripheral groove 23 on the pedal shaft 22 inserted into the pedal shaft attaching member 30, is disposed in the pedal shaft attaching member in a freely slidable manner, thereby capable of offering a sufficient retaining function for the pedal shaft 22 even by the one lock member 50 owing to adoption of the plate-like lock member 50 of high strength. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pedal shaft coupling structure in which a pedal shaft is detachably mounted on a crank member via a pedal shaft mounting member with one touch. In particular, the present invention is applied to an infant bicycle in which a pedal shaft can be easily detached from a crank member when an infant or the like takes a lesson to ride on a bicycle, but the present invention is not necessarily limited to an infant bicycle.

When an infant or the like rides a bicycle for the first time, as a lesson before pedaling, the infant is standing upright while sitting on a saddle and kicking the ground with both feet to travel a predetermined distance. This will help you learn how to balance your bike. Therefore, it is necessary to remove the pedal shaft from the crank member, but it is not easy for an infant or mother to remove the pedal from the crank using a tool. It could be dangerous because it could fall over and break the pants. Therefore, a pedal attaching / detaching device that can easily remove the pedal shaft from the crank member with one touch has been proposed (see, for example, Patent Document 1 below).
Japanese Patent No. 3798398 (refer to Claim 1)

  The bicycle pedal attaching / detaching device disclosed in Patent Document 1 will be briefly described with reference to FIG. As shown in FIG. 8A, a box-shaped case 120 is mounted by a cylindrical pedal receiving cylinder 116 that is inserted into and screwed into a pedal mounting hole 110a at the rotating end of the pedal crank 110. A guide plate 124 and a lock mechanism 118 (FIG. 8B) attached to the guide plate 124 are stored in a storage portion on the opposite side of the pedal in the case 120. A pedal support shaft 114 is inserted into the shaft hole in the pedal receiving cylinder 116 and locked by the lock mechanism 118 to be prevented from being removed. As shown in FIG. 8B, the lock mechanism 118 is housed between the inner surface of the guide housing portion of the case 120 and the guide plate 124, and is guided by the guide plate 124 and can slide in opposite directions. A pair of stopper plates 126 and 126 having an opening 140 formed with a substantially half-moon engaging claw portion 142 that engages and disengages with the annular groove 114b of the inserted pedal support shaft 114, and these stopper plates 126 and 126 are provided with the above-described stopper plates 126 and 126. The springs 136 and 136 are configured to be engaged with the annular groove 114b of the pedal support shaft 114, that is, to bias the stopper plates 126 and 126 outwardly from the case 120 (counter arrow direction).

  With such a configuration, as shown in FIGS. 8B and 8C, each of the stopper plates 126 and 126 is gripped with fingers and pressed in the direction of the arrow against the restoring force of the springs 136 and 136. The opening 140 of the stopper plate 126 is enlarged to have an elliptical shape. As shown in FIG. 8C, when the shaft is inserted through the shaft hole of the pedal receiving cylinder 116, the shaft end reaches the opening 140 and the annular groove 114 b is aligned with the position of each stopper plate 126. Then, the pressure applied to each stopper plate 126 is released. As a result, the pair of stopper plates 126 and 126 are moved in the direction opposite to the arrow by the restoring force of the springs 136 and 136, and the engaging claw portion 142 of the opening 140 in the stopper plate 126 is formed in the annular groove 114 b of the pedal support shaft 114. Engage. Thus, it is possible for women and girls to easily attach and detach the pedal support shaft to / from the crank without using special tools, and it is possible to safely and easily carry out lessons for infants.

However, in this conventional bicycle pedal attaching / detaching device, the stopper plate 126 that constitutes the lock mechanism 118 is configured such that the lock is not released by only one operation, and thus a one-to-one set configuration is required and the number of components increases. It was inevitable to do. In addition, since the stopper plate 126 has a one-to-one configuration, there is an advantage that it can be distributed and arranged on both sides of the rotating end portion of the pedal crank 110 that is easy to press, but it is used during lessons and running The person's feet easily hit the stopper plate 126, and the stopper plate 126 was easily damaged or the shoe sole was easily hooked. In addition, there are many opportunities for the stopper plate 126 to be damaged by external obstacles.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a pedal shaft coupling structure that solves the problems of the conventional pedal shaft coupling structure, can simplify the structure of the lock member, has no fear of erroneous operation or damage, and can be easily attached and detached. Objective.

  Therefore, the present invention provides a pedal shaft coupling structure in which a pedal shaft is detachably mounted on a crank member via a pedal shaft mounting member in a one-touch detachable structure, and is provided in a lock circumferential groove of the pedal shaft inserted into the pedal shaft mounting member. One plate-like lock member formed with a detachable lock hole is slidably installed on the pedal shaft mounting member. Further, the present invention is characterized in that an operation portion for locking and disengaging the slide to the pedal shaft in the lock member is positioned behind the crank arm. Further, the present invention is characterized in that the operation direction for the lock engagement / disengagement / sliding operation with respect to the pedal shaft in the lock member is substantially the direction in which the crank arm extends and intersects the pedal shaft. Further, the present invention is configured such that the operation portion of the lock member is protected by a protrusion formed on the pedal shaft mounting member so as not to receive interference from the outside at the unlocked position with the pedal shaft. These are the means for solving the problems.

  According to the present invention, in the pedal shaft coupling structure in which the pedal shaft is detachably mounted on the crank member via the pedal shaft mounting member, the lock shaft groove of the pedal shaft inserted into the pedal shaft mounting member is provided. A single plate-shaped lock member having a detachable lock hole is slidably installed on the pedal shaft mounting member, so that even a single lock member is sufficient by adopting a high-strength plate-shaped lock member. A function to prevent the pedal shaft from pulling out.

  Further, when the operation portion for locking / disengaging the lock to / from the pedal shaft in the lock member is positioned behind the crank arm, the pedal shaft can be easily operated only by the operation portion of one lock member having a simple structure. However, there is almost no chance that the operation portion of the lock member located behind the crank arm is erroneously operated due to a paralysis or is damaged due to an external cause. Furthermore, when the operation direction for the lock engagement / disengagement / sliding operation with respect to the pedal shaft in the lock member is substantially the direction in which the crank arm extends, the lock member is located behind the crank arm. The operation portion of the lock member can be operated substantially along the extending direction of the crank arm, so that the lock member is engaged with and disengaged from the pedal shaft at the pedal shaft portion. This makes it possible to operate smoothly and stably.

  Furthermore, when the operation portion of the lock member is configured to be protected by a protrusion formed on the pedal shaft mounting member so as not to receive external interference at the unlocked position with the pedal shaft. If the operation unit does not operate sufficiently to the unlocked position with the pedal shaft, the operation unit in the lock member may be interfered by an external cause. The pedal shaft is unlocked and will not fall off.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show one embodiment of a pedal shaft coupling structure according to the present invention. FIG. 1 is an exploded perspective view of a main part of the pedal coupling structure, and FIG. 2 is a main part after assembly of the pedal coupling structure is completed. 3 is a perspective view and a front view of a main part in an initial state before the pedal is mounted, FIG. 4 is a perspective view of a main part when the operating member is pressed before the pedal is mounted, and FIG. 5 is a pedal shaft when the operating member is pressed. FIG. 6 is a front view of the main part when the lock is incomplete when the operation member is released, and FIG. 7 is a perspective view and a front view of the main part at the normal position when the lock is completed.

  Hereinafter, embodiments of the pedal shaft coupling structure of the present invention will be described in detail. As shown in FIG. 1, the basic structure of the pedal shaft coupling structure of the present invention is a pedal shaft coupling structure in which the pedal shaft 22 is detachably mounted on the crank member 10 via the pedal shaft mounting member 30 with one touch. A single plate-like lock member 50 having a lock hole 54 that is detachable in the lock circumferential groove 23 of the pedal shaft 22 inserted into the pedal shaft mounting member 30 is slidably installed on the pedal shaft mounting member 30. It is characterized by that.

  As shown in FIG. 1, a pedal shaft hole 12 is formed at the shaft end of a crank arm 11 in a crank member 10 having a drive sprocket (not shown). A box-shaped pedal shaft mounting member 30 having an open head is attached in a form in which the shaft end portion of the crank arm 11 is received and held. The pedal shaft mounting member 30 includes a main body portion 31 and a cover portion 32 that is mounted on the main body portion 31 with one touch. The main body 31 includes a flat plate-like wall 33 attached to the outside of the shaft end of the crank arm 11 (the pedal side opposite to the vehicle body center side) and a side surface (vehicle body of the shaft end of the crank arm 11). And a peripheral wall portion 34 standingly formed from the additional wall portion 33 in a form surrounding the end portion. A pedal shaft hole 36 is formed in a portion of the additional wall 33 corresponding to the pedal shaft hole 12 of the crank arm 11.

  Engagement holes 35 are formed in the peripheral wall portion 34 of the main body portion 31 of the pedal shaft mounting member 30 on both upper and lower bottoms. On the other hand, the flat cover portion 32 of the pedal shaft mounting member 30 is provided with a pedal shaft hole 38 in a substantially central portion, and engaging claws 37 are provided on the upper side and the lower portion (not shown in FIG. 1). It extends in a form attached to the inside of the wall 34. Each of these engaging claws 37 is attached to each corresponding engaging hole 35 of the peripheral wall portion 34 from the inside of the peripheral wall portion 34 by one touch. Among these engaging claws 37, those on both upper sides are formed at portions of projections 39 formed on both sides of the upper edge of the cover portion 32. These engaging claws 37 also have a function as a stopper on the upper shoulder of the guide portion 51G in the operation member 50 described later.

  In order to attach the main body portion 31 of the pedal shaft mounting member 30 to the crank arm 11, the additional wall portion 33 of the main body portion 31 is connected to the end portion of the crank arm 11 in order to align the pedal shaft holes 12 and 36. It is fixed by the tightening member 40 in a state of being attached to the outer side. The tightening member 40 is configured by a screw cylinder portion 43 and a nut portion 41 by distributing a large washer portion 42 inward and outward. A shaft hole through which the pedal shaft 22 can be inserted through the screw cylinder portion 43 and the nut portion 41 is formed. By rotating the nut portion 41 with an appropriate tool or the like, the outer periphery of the screw cylinder portion 43 is screwed into the screw portion formed on the inner periphery of the pedal shaft hole 12 of the crank arm 11. Accordingly, the additional wall portion 33 of the main body portion 31 of the pedal shaft mounting member 30 is fastened and fixed to the shaft end portion of the crank arm 11. The cover portion 32 is attached to the main body portion 31 through the engagement claw 37 and the engagement hole 35 with one touch.

In the main body 31 of the pedal shaft mounting member 30 mounted on the shaft end portion of the crank arm 11, the lock member 50 is accommodated so as to be slidable in the vertical direction (the extending direction of the crank arm 11). Note that the operation direction of the lock member 50 may be slightly shifted from the extending direction of the clank arm 11 so as to be easily operated if it goes in the pedal axis direction (crosses). The lock member 50 is preferably configured by connecting an operation member 51 made of plastic or the like and a lock plate 53 made of a flat stainless steel plate or the like. The lock plate 53 is formed with a lock hole 54 formed of a dharma hole or the like connecting the large diameter hole and the small diameter hole. The operation member 51 is provided with guide portions 51G and 51G on both sides thereof, and an operation portion 52 is formed on the upper end portion. On the inner peripheral surface of the peripheral wall portion 34 of the main body portion 31 of the pedal shaft mounting member 30, a step guide portion 34G that is substantially flush with the inner side surface (vehicle center side) of the shaft end portion of the crank arm 11 is formed. The guide portion 51G of the operation member 51 in the lock member 50 is slidably contacted and smoothly guided. Therefore, the operation member 51 is sandwiched between the inner side surface of the crank arm 11 and the cover portion 32 of the pedal shaft mounting member 30 without being excessive or deficient, is appropriately guided, and is smoothly slid.

  One end portion 57 of a coiled return spring 56 is engaged with a spring mounting hole 55 formed in the lower portion of the lock plate 53 in the lock member 50, and the other end portion 58 is inside the main body portion 31 of the pedal shaft mounting member 30. It is locked at an appropriate part. As a result, the lock member 50 is urged upward, and the small-diameter hole portion of the dharma hole 54 is constantly aligned with the pedal shaft 22. As will be described later, an appropriate position display portion 59 for displaying the mounting state of the pedal shaft 22 is engraved or described on the front side (the cover portion 32 side) facing the vehicle body inside the operation member 51 in the lock member 50. The

  In this way, the pedal shaft 22 that pivotally supports the pedal 21 is mounted on the pedal shaft mounting member 30 mounted on the shaft end portion of the crank arm 11 by the tightening tube member 40 in one touch. Depending on the work. 3 to 7 with reference to FIG. 1, as shown in the initial state of FIG. 3A, the lock member 50 is more than the protrusions 39 on both sides of the cover portion 32 of the pedal shaft mounting member 30. From the state in which the operation unit 52 is sufficiently protruded upward (as shown in FIG. 3B, both the appropriate lock position display unit 59 and the initial position display unit 60 are also exposed from the cover unit 32). As shown in FIG. 4, the operation portion 52 of the lock member 50 is pressed with a finger so that the large-diameter hole portion of the Dalma hole 54 of the lock plate 53 is matched with the insertion locus of the pedal shaft 22.

  Next, as shown in FIG. 5, the pedal shaft 22 is inserted through the tightening member 40, and the lock circumferential groove 23 carved at the end of the pedal shaft 22 is a Dharma hole 54 of the lock plate 53. The pressing force of the operating portion 52 of the operating member 51 is released at an appropriate position that has reached the position corresponding to. 7A and 7B, the lock plate 53 is raised by the restoring force of the return spring 56, and the small-diameter hole portion of the dharma hole 54 engages with the lock circumferential groove 23 of the pedal shaft 22. . In this state, only the proper lock position display part 59 is exposed from the cover part 32. Thus, the pedal shaft 22 is locked with its movement in the axial direction restricted and securely mounted without dropping from the pedal shaft mounting member 30. FIG. 2 shows this state.

  Preferably, the pedal shaft hole 36 in the pedal shaft mounting member 30 is aligned and matched with the pedal shaft hole 12 of the crank shaft arm 11, but if allowed by design, the pedal shaft mounting member 30 is connected to the crank shaft arm 11. To attach the pedal shaft to the pedal shaft hole of the pedal shaft mounting member 30 by using a separate fixing device without using the pedal shaft hole 12 of the crank arm 11. You can also. Further, in consideration of the axial alignment accuracy between the lock circumferential groove 23 in the pedal shaft 22 and the lock hole 54 such as a dharma hole of the lock plate 53 (so as to be coarse), the lock circumferential groove 23 in the pedal shaft 22 is considered. Is configured such that the pedal shaft 22 can be inserted to a position slightly beyond the lock hole 54 of the lock plate 53.

That is, the lock circumferential groove 23 in the pedal shaft 22 is slightly over the lock hole 54 of the lock plate 53 at a position where the inner end portion of the pedal 20 contacts the nut portion 41 of the tightening cylinder member 40. Configure. This state is the state of FIG. Only a part of the proper lock position display part 59 is exposed. With such a configuration, even if the axial alignment accuracy between the lock circumferential groove 23 in the pedal shaft 22 and the lock hole 54 in the lock plate 53 is rough, the return spring 56 is slightly pulled back when the pedal shaft 22 is slightly pulled outward. Due to the restoring force, the lock plate 53 is raised, and the small-diameter hole portion of the dharma hole 54 is engaged with the lock circumferential groove 23 of the pedal shaft 22 to complete the lock. FIG. 7 shows this state, and only the proper lock position display portion 59 is exposed from the cover portion 32.

  With respect to the protrusions 39, 39 provided on both upper sides of the cover portion 32 of the pedal shaft mounting member 30, the operating portion 52 of the lock member 50 is not subject to external interference at the unlocked position with the pedal shaft 22. In addition, the operation unit 52 is configured to be protected. Thus, the lock is not released unless the operation unit 52 is sufficiently pressed to the unlocked position with the pedal shaft 22. Even if the operation part of the lock member is to be interfered with by an external cause, the operation part is effectively protected by these protrusions 39, 39, so that it is possible to prevent the pedal shaft from being unlocked and falling off due to the illusion. . In order to remove the pedal 21 from the crank arm 11, the small-diameter hole portion of the Dalma hole 54 in the lock plate 53 is disengaged from the lock circumferential groove 23 of the pedal shaft 22 by sufficiently pushing the operating portion 52 as shown in FIG. The large diameter hole faces the pedal shaft 22. Thus, the pedal shaft 22 can be removed from the pedal shaft mounting member 30 by moving in the axial direction.

  In the above-described embodiment, the operation member 52 of the lock member 50 is pressed against the pedal shaft mounting member 30 against the restoring force of the return spring 56 to release the lock. As described above, the large-diameter hole portion and the small-diameter hole portion of the dharma hole 54 of the above-described embodiment are arranged upside down, and the operating member 52 is pulled against the restoring force of the return spring in which the urging force is reversed. Thus, the pedal shaft 22 can be unlocked with respect to the crank arm 11. Further, as in the above embodiment, the lock member 50 is made of another material such as a plastic operation member 51 and a stainless steel plate lock plate 53, and a high strength lock portion is made of a stainless steel plate, etc. Although it is possible to select plastic made of the operation portion that is excellent in pressing feeling, the lock member 50 can be entirely made of a stainless steel plate or the like.

Although the embodiments of the present invention have been described above, within the scope of the gist of the present invention, a pedal shaft hole forming form (such as a screwing form with a tightening cylinder member) that constitutes the crank member is used. When attaching a tightening tube member, the shape (square cross section, etc.) and type (hollow, solid) of the crank arm including the tightening tube member can be attached to an appropriate part of the crank arm shaft by appropriate means. ), The shape of the pedal shaft mounting member (it can also be configured to be flat and accommodate the lock member by attaching and fixing the shaft end of the crank arm inside) To the main body of the cover part) and material (plastic is preferred, but appropriate light metal etc. can also be adopted). Wearing form (implementation In addition to the one-touch configuration in which the engagement hole and engagement claw formation sites are reversed, the one-touch configuration may not be installed by screwing or the like, and the engagement / disengagement configuration of the pedal shaft and the lock hole of the lock plate (the pedal shaft A combination of a lock circumferential groove and a dharma hole is preferable, but a keyhole shape may be used in addition to the dharma hole), and the shape of the operation part (in addition to the shape as in the embodiment, a suitable shape that is easy to press, such as a semicircular shape) The shape, type, and material of the lock member including a non-metal such as plastic, and the lock plate made of a metal such as stainless steel are preferable, but are integrally formed of a metal such as a stainless steel plate. As well as the slide configuration, the operation direction of the lock member (the extension direction of the crank arm is preferred, but it may be slightly shifted if going in the pedal axis direction), the shape and shape of the return spring (In addition to the coil spring as in the embodiment, the tension spring or the tensioning part can be replaced with a compression spring), the shape and length of the protrusion on the pedal shaft mounting member that protects the operating portion of the lock member from the outside (It may be determined in relation to the display unit) and the like can be selected as appropriate.

1 shows one embodiment of a pedal shaft coupling structure according to the present invention, and is an exploded perspective view of a main part of the pedal coupling structure. It is a principal part perspective view after the assembly completion of a pedal coupling structure. It is the principal part perspective view and front view of an initial state before pedal installation similarly. It is a principal part perspective view at the time of the press of the operation member before pedal mounting similarly. It is a principal part perspective view at the time of pedal shaft insertion at the time of the operation member pressing same. It is a principal part front view at the time of the lock incomplete at the time of the press release of an operation member. It is the principal part perspective view and front view of the regular position at the time of completion of a lock | rock same as the above. It is explanatory drawing of the bicycle pedal attachment / detachment apparatus which is a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Crank member 20 Pedal member 22 Pedal shaft 23 Lock circumferential groove 30 Pedal mounting member 31 Main body part 32 Cover part 40 Fastening cylinder member 50 Lock member 51 Operation member 53 Lock plate 54 Lock hole (Dalma hole)
56 Return spring

Claims (4)

In a pedal shaft coupling structure in which a pedal shaft is detachably mounted on a crank member via a pedal shaft mounting member, a lock hole that is detachably engageable with a lock circumferential groove of the pedal shaft inserted into the pedal shaft mounting member A pedal shaft coupling structure characterized in that one plate-shaped lock member formed with a slidably mounted on a pedal shaft mounting member. 2. The pedal shaft coupling structure according to claim 1, wherein an operation portion for engaging and disengaging the lock to and from the pedal shaft in the lock member is positioned behind the crank arm. The pedal according to claim 1 or 2, wherein an operation direction for the lock engagement / disengagement slide operation with respect to the pedal shaft in the lock member is set to a direction intersecting with the pedal shaft in a substantially extending direction of the crank arm. Shaft coupling structure. The operation portion of the lock member is configured to be protected by a protrusion formed on the pedal shaft mounting member so as not to receive external interference at the unlocked position with the pedal shaft. The pedal shaft coupling structure according to any one of claims 1 to 3.

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