JP2649886B2 - Connection structure of crank and pedal shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for connecting a pedal shaft of a bicycle and a crank for a gear crank, and to which the pedal shaft can be easily attached to the crank.

[0002]

2. Description of the Related Art Recently, bicycles are often sold through non-specialized stores such as supermarkets. In such non-specialized stores, bicycles are assembled by unskilled persons with little technical knowledge. The simplicity of the assembling work has been increasingly desired.

[0003] In the above-mentioned supermarkets and the like, a pedal or the like is assembled to a received bicycle to make a completed product, and a structure as shown in FIG. 9 is conventionally used as a structure for assembling the pedal to a crank to which the bicycle is attached. It had been. A female screw (11a) is cut into the shaft hole (11) of the crank (1), and a male screw (21b) is cut into the tip of the pedal shaft (2) to be screwed into this. I have. When the pedal (A) is depressed, the direction of engraving these screws is
The left and right pedals are
(A) In (A), the thread is cut in the opposite direction.

[0004] However, in the above-mentioned conventional one, there is a problem that the operation of assembling the pedal to the crank (1) cannot be performed easily. In the above conventional device, since the screw engraved on the pedal shaft (2) is formed by the left and right pedals (A) and (A) in reverse as described above, the left and right pedals (A) and (A) It is not only necessary to screw these pedals to the crank (1) after identifying them, but also to screw these pedals (2) to the left and right pedals to the crank (1). (2)
Need to be rotated and tightened in accordance with the screw directions formed for each.

[0005] That is, in the above-mentioned conventional art, the assembling work of the left and right pedals is not sufficiently standardized. For this reason, in the above-mentioned prior art, it is difficult to perform the assembling work of the pedal, and there is a disadvantage that the work is troublesome, especially when the unskilled person having little technical knowledge as described above performs the assembling work.

An object of the present invention is to provide a "structure in which a pedal shaft is connected to a crank portion of a bicycle gear crank" so that even an unskilled person can easily and quickly assemble a pedal.

[0007]

The technical means of the present invention for solving the above-mentioned problem includes a shaft hole (11) penetrating near the lower end of the crank (1) and for inserting a tip end of a pedal shaft (2). An engaging member mounted on the front end side of the trunk portion of the pedal shaft (2) so as to be able to protrude and retract in a radial direction and urged in a projecting direction by a spring;
An engaging recess formed on the wall surface of the shaft hole (11) and engaged with the engaging body when the pedal is mounted, and formed at a joint boundary between the pedal shaft (2) and the crank (1) and engaged with the engaging body; When the engagement recess is in the engaged state, the engagement protrusion for preventing rotation is provided on the crank or pedal shaft, and the engagement recess is provided on the pedal shaft or crank.

[0008]

The above technical means operates as follows. The tip of the pedal shaft (2) is opposed to the shaft hole (11) penetrating near the lower end of the crank (1). In this state, the distal end of the pedal shaft (2) is inserted into the shaft hole (11) while pushing the engaging body loaded on the body distal end side of the pedal shaft (2) in the non-projecting direction against the urging force of the spring. As it is inserted, the engagement body engages with an engagement recess formed in the inner wall of the shaft hole (11), whereby the pedal shaft (2) is prevented from coming off with respect to the crank (1). .

When the engaging member engages with the engaging recess when the pedal shaft (2) is inserted, the fitting protrusion formed on the joint boundary between the pedal shaft (2) and the crank (1) fits. The mating recess fits in the rotation preventing direction, whereby the pedal axle (2) is assembled in a retaining and rotation preventing state. in this way,
According to the above technical means, the pedal can be assembled simply by forcibly inserting the pedal shaft (2) into the shaft hole (11) of the crank (1), and the working method in which the left and right pedals are completely uniformed Assembled with

[0010]

[Effect] Since the left and right pedals are assembled by a completely unified work method, compared to the above-mentioned conventional one which required the assembly work while considering the screw direction with the left and right pedals. The pedal can be easily and quickly assembled.

[0011]

Next, an embodiment of the present invention will be described. As shown in FIG. 1, a shaft hole (11) extends through the lower end of the crank (1), and the shaft hole (11) is formed in a cylindrical hole (1) on the pedal insertion side.
10) (a constant diameter) and a tapered hole (111) formed so as to contract in diameter toward the vehicle body frame side. Then, the cylindrical hole (1
10), a groove-shaped fitting recess (1
2) is cut away, and the fitting concave portion (12) is formed so as to gradually become shallower toward the vehicle body side. Also, tapered hole
On the inner wall of (111), a groove-shaped engaging concave portion (13) opening toward the vehicle body is cut.

Next, the outer shape of the tip of the pedal shaft (2) is formed in a shape that matches the shaft hole (11) at the lower end of the crank (1). In other words, the vicinity of the distal end of the pedal shaft (2) is a tapered portion (200) that decreases toward the distal end, and the portion following the base end of the tapered portion (200) is a cylindrical portion (201). ing. As shown in FIGS. 1 and 2, the pedal shaft (2)
An axial vertical groove (202) is cut out on the outer surface of the pedal shaft (2), and the vertical groove (202) is formed near the tip of the pedal shaft (2).
The transverse groove (203) is cut in a manner orthogonal to the above.

The vertical groove (202) is provided with a swinging claw (4), and the columnar base (41) of the swinging claw (4) is formed in the above-described horizontal groove.
(203) is fixed by a presser fitting (44) in a state of being housed in a central portion thereof. Then, as shown in FIG.
4) is an upper plate (45) contacting the cylindrical base (41) of the rocking claw (4) from above and side plates (46) (46) bent down from both sides.
And accommodates a columnar base (41) of the swinging pawl (4) between the side plates (46) and (46) to prevent lateral movement of the swinging pawl (4). I have. And, the presser fitting (44) is attached with a rivet (47) to the mounting hole (2) formed in the tip end surface of the pedal shaft (2).
3) The part is caulked. Further, the rocking tip (40) of the rocking claw (4) is urged in the protruding direction by a spring (42), and in this embodiment, the rocking tip (40) is provided by the above-mentioned technical means. The engagement body described in the item is constituted.

Further, a cylindrical portion (201) of the pedal shaft (2)
On the outer peripheral surface of the fitting projection (21) protrudes,
The width of (21) is the corresponding fitting recess (12) on the side of the shaft hole (11).
(See FIG. 4).
The rotation of the pedal shaft (2) is prevented by the engagement between the fitting concave portion (12) and the fitting convex portion (21).

Next, the operation of attaching the pedal shaft (2) to the crank (1) will be described. As shown in FIG. 1, the pedal shaft is inserted into a shaft hole (11) penetrating near the lower end of the crank (1).
(2), and the swinging claw (4) provided on the outer wall of the pedal shaft (2) and the corresponding fitting recess (12) on the shaft hole (11) side. State. When the pedal shaft (2) is inserted into the shaft hole (11) in this state, the swinging pawl (4)
The rocking tip (40) of the corresponding fitting recess (1
It is pushed against the urging force of the spring (42) while being guided by the inclined wall (121) of (2). When the pedal shaft (2) is further inserted,
The swinging tip (40) of the swinging pawl (4) passes through the fitting recess (12) and fits into the engaging recess (13), whereby the swinging pawl is biased by the spring (42). (4) engages with the vertical wall (130) of the engaging recess (13) (see FIG. 5). As a result, the pedal shaft (2) is stopped. When the pedal shaft (2) is inserted to the final position, the fitting protrusion (21) protruding from the cylindrical portion (201) of the pedal shaft (2) fits into the corresponding fitting on the crank (1). It fits into the mating recess (12) (the state of FIG. 4), whereby the relative rotation between the pedal shaft (2) and the crank (1) is prevented.

Further, in the above embodiment, the pedal shaft
A tapered portion (200) is formed at the tip of (2), and a tapered hole of a shape corresponding to this is formed in the shaft hole (11).
Because (111) is formed, pedal shaft (2) and crank (1)
If the connection of the pedal is loose, turn the pedal shaft (2) to the crank (1).
The pedal shaft (2) can be more strongly coupled to the shaft hole (11) by using a hammer or the like to drive the pedal shaft (11) into the shaft hole (11) by using the taper fitting between the taper portion (200) and the taper hole (111). it can.

Further, when a depressing force acts on the pedal (A), a direction in which the two are slid along the tapered fitting portion between the shaft hole (11) and the pedal shaft (2), that is, A force acts in a direction to cause the pedal shaft (2) to escape. However, when the pedal shaft (2) starts to move in the escape direction, the pedal shaft (2) and the shaft hole (11) are exclusively formed by these cylindrical portions (201).
And it is supported by the cylindrical hole (110). Then, the pedaling force of the pedal (A) is mainly received by the cylindrical portion (201) and the cylindrical hole (110), and the pedal shaft
(2) and the tapered portion (200) of the shaft hole (11) and the tapered hole portion (1
11) The mutual pressing force decreases. This allows the pedal shaft
The force acting in the direction to escape (2) is reduced, so that no force acts between the pedal shaft (2) and the crank (1) to separate them further. This prevents the pedal shaft (2) from falling off.

When the pedal shaft (2) in the above-mentioned embodiment is detached, the pedal shaft (2) is swung by the tool (K) inserted from the open end of the engaging recess (13) as shown in FIG. The swinging tip (40) of the pawl (4) is pushed in to disengage it from the step (130), and the pedal shaft (2) may be pulled out in this state. In the second embodiment shown in FIGS. 6 to 8, the pin (26) is inserted into a blind hole (25) perpendicular to the axis of the pedal shaft (2). , And the advance / retreat pin (26) is urged in the projecting direction by a spring (42). A pair of inclined surfaces (260) (260) approaching each other toward the distal end is formed at the distal end of the advance / retreat pin (26), and further, near the distal end of the advance / retreat pin (26). The wall surface perpendicular to the portion where the inclined surfaces (260) and (260) are provided is cut in parallel by a pair of vertical walls (261) and (261) (see FIG. 8).
Steps (263) and (263) formed at the base end of the vertical walls (261) and (261) are formed in an annular groove near the front end of the pedal shaft (2).
End (280) (28) of C-shaped holding spring (28) externally fitted to (29)
0), whereby the advance / retreat pin (26) is held in the escape preventing state.

In this embodiment, the pedal shaft is moved from the state shown in FIG.
When (2) is inserted into the shaft hole (11), when the advance / retreat pin (26) coincides with the wall surface (132) on the pedal insertion side of the engagement concave portion (13), these two are engaged, whereby Pedal shaft (2) and crank
(1) is coupled to the retaining state. A fitting recess (12) opening to the pedal insertion side of the shaft hole (11) and a fitting projection (21) corresponding to the fitting recess (12) projecting from the side wall of the pedal shaft (2) are fitted in a detented state. Combine. The fitting recess (12) and the fitting protrusion (21) fitted therein have the same width as in the first embodiment described above.

In this embodiment, the pedal shaft
To remove (2), the tool (K) inserted from the open end of the engaging recess (13) is used to push the head of the reciprocating pin (26) in the same manner as in the first embodiment described above to 132) can be released. In each of the above embodiments, the fitting recess (12) was formed at the outer end of the vehicle body of the shaft hole (11). However, as shown by the imaginary line in FIG. ) May be cut at the tip edge. In this case, the fitting protrusion (21) fitted into the fitting recess (12) is projected from the inner surface of the end of the shaft hole (11) on the vehicle body side as shown by the imaginary line in FIG.

[Brief description of the drawings]

FIG. 1 shows a pedal shaft (2) and a crank in a first embodiment.
Explanatory drawing showing the state before combining (1)

FIG. 2 is a partially cutaway perspective view of the first embodiment.

FIG. 3 is an explanatory view showing the relationship between the swinging pawl (4) and the presser fitting (44).

FIG. 4 is a front view of the crank (1).

FIG. 5 is a sectional view showing a coupling state between the crank (1) and the pedal shaft (2).

FIG. 6 shows a pedal shaft (2) and a crank in a second embodiment.
Explanatory drawing showing the state before combining (1)

FIG. 7 shows a crank (1) and a pedal shaft in a second embodiment.
Sectional view showing the joined state of (2)

FIG. 8 shows a crank (1) and a pedal shaft in a second embodiment.
Sectional view showing the joined state of (2)

FIG. 9 is an explanatory view of a conventional example.

[Explanation of symbols]

 (1) ・ ・ ・ Crank (2) ・ ・ ・ Pedal shaft (4) ・ ・ ・ Oscillating claw (11) ・ ・ ・ Shaft hole (110) ・ ・ ・ Cylinder (111) ・ ・ ・ Taper

Claims (5)

(57) [Claims] In a structure in which a pedal shaft is connected to a crank portion of a bicycle gear crank, a shaft hole (11) penetrated near a lower end of the crank (1) and into which a tip of a pedal shaft (2) is inserted. ), An engaging member mounted on the tip end side of the pedal shaft (2) so as to be able to protrude and retract in the radial direction and urged in a protruding direction by a spring, and a pedal formed on a wall surface of the shaft hole (11) and An engaging recess in which the engaging body engages in the mounted state, and which are formed at a joint boundary between the pedal shaft (2) and the crank (1) and mesh with each other when the engaging body and the engaging recess are in the engaging state. A coupling structure of a crank and a pedal shaft, wherein a fitting projection for preventing rotation is provided on a crank or a pedal shaft, and a fitting recess is provided on a pedal shaft or a crank. 2. A swinging pawl (4) having an end located on the vehicle body side fixed to a side wall near a tip end of a pedal shaft (2) so as to be swingable, and the swinging pawl (4) is swung. 2. The structure of claim 1, wherein the end portion is used as an engaging body. 3. The crank and pedal according to claim 2, wherein said swing claw (4) is swingably held by presser fittings (44) abutting on an upper surface and both side surfaces of a base end portion of said swing claw (4). Shaft coupling structure. 4. A blind hole (25) drilled in the side wall near the tip of the pedal shaft (2) and an advance / retreat pin (26) loaded in the blind hole and urged in a projecting direction by a spring (42) are provided. 2. The coupling structure between a crank and a pedal shaft according to claim 1, wherein said advance / retreat pin is used as an engaging body. 5. A tapered hole portion (111) which expands the shaft hole (11) toward the outside of the vehicle body, and a cylindrical hole portion (110) extending to the large diameter side thereof.
The coupling structure between a crank and a pedal shaft according to any one of claims 1 to 4, wherein the outer shape of the distal end portion of the pedal shaft (2) is set to a shape adapted to the shaft hole (11). .