JP2600808Y2 - Folding bicycle fastening mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable bicycle which is folded at almost the center of a frame.

[0002]

2. Description of the Related Art A conventional frame folding structure generally employs a hinge structure used for a door or the like as shown in Japanese Utility Model Publication No. 50-38126 and Japanese Patent Publication No. 58-14356. A hinge is welded to the intermediate cut portion one side at a time, one end is fitted and supported on the other, and the other end is fixed by a bolt or the like, and a running state is established.

[0003]

However, in the conventional folding bicycle having a hinge structure, the rotating part and the bolt part project right and left outward, so that clothes and the like are easily entangled and protected to prevent it. Even if a frame is provided, it is separate from the hinge structure, so the number of parts increased, and it was difficult to make the appearance sophisticated.

[0004] The present invention is to solve the above problems,
Running, while providing a folding bicycle small structures caught such clothes, more tie bolts for some reason
Folding self that prevents coming off even if loose
The purpose is to provide turning points .

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is to tighten a hinge on a frame pipe .
Storage for storing at least a part of bolts and tightening nuts
Forms a space, wherein the housing a bolt and nut clamping fastening, as well as minimizing the protrusion of the appearance, the bolt及tightening
At least a part of the tightening nut is elastically
The structure has an elastic body for holding .

[0006]

With this structure, clothes and the like are hardly entangled during traveling, and the hinge structure provided on the frame pipe itself serves as a protective frame. Also, the tightening bolt may
Even if loosened, the tightening bolt is held in the storage space.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a frame of a folding bicycle, in which a frame pipe 4 connecting a front part having a head pipe 2 and a rear part having a standing pipe 3 is divided in the middle. A hinge 5 is provided at the split part, a front hinge 5a is a front frame pipe 4a, and a rear hinge 5b is a rear frame pipe 4b.
And each one. A tightening shaft 6 is rotatably fitted to the right side of the rear hinge 5b, and a fitting portion of the tightening bolt 7 with the hole 7a becomes an eccentric shaft 6a. FIG.
have. During traveling, the fastening shaft 6 is positioned by the hook 10. 11 is a lid. In FIG.
Is a flanged nylon nut screwed onto the fastening bolt 7. The lid 11 is press-fitted into the nut 12, and the space other than the outer wall 11a that covers the space 5c is housed in the space 5c. At this time, the projection 7b at the tip of the tightening bolt is engaged with the screw 13 while climbing over the peak 14a of the elastic body 14 mounted in the storage space 5c. Therefore, even if the nut 12 is loosened, the eccentric effect of the eccentric shaft 6a is weakened, and the pressing force of the pressing surface 5d is loosened, the tightening bolt 7 remains in the storage space.
Is held . Reference numeral 15 denotes a rotation axis serving as a center of rotation of the frame, which is provided on the left side of the front and rear hinges 5a and 5b and at a right angle to the ground, so that the folding direction of the bicycle is substantially parallel to the ground. I have. Since the frame pipe 4 rises forward with respect to the ground, the shaft 14 penetrates the hinge 5 obliquely.

FIG. 3 shows a state in which the tightening shaft 6 is rotated to set the eccentric portion in the loosening direction and the tightening bolt is removed. The protrusion 8 (FIG. 5) regulates the rotation angle of the tightening shaft 6. During the forward rotation, the projection 8 comes into contact with the side surface 5c of the hinge body 5b, and the fastening shaft 6
Do not rotate more than °. The lid 11 has a finger hook 11b at a lower front portion of the outer wall 11a.

When the tightening shaft 6 is rotated in the direction of arrow A until the projection 8 comes into contact, the eccentric action causes the nut 12 to separate from the press-contact surface 5d. At this time, if a finger is put on the finger hook 11b and a force is applied in the direction of arrow B, the protrusion 7b
4a, and rotates to the illustrated state. Since the tightening bolt 7 is accommodated in the hinge body 5 parallel to the frame pipe 4, it has an angle of α (FIG. 5) with respect to the ground, Because 7a is later
The rotation is light. After the cover 11 is press-fitted into the nut 12, the screw 16 (FIG. 7) passes through the groove 11c below the cover 11,
Since the nut 12 is fixed to the tightening bolt 7, the nut 12 does not rotate even if a force is applied to the finger hook 11b, and the tightening bolt 7 is separated from the storage space 5c. In this state, the front frame pipe 4a is rotated in the direction of arrow C to be folded.

When assembling, the front and rear frame pipes 4a and 4b are aligned with each other, a force is applied to the outer wall 11a of the lid 11 in the direction of arrow D, and the outer wall 11a is rotated as shown in FIG.
The whole is pushed into the storage space 5c until the user gets over the mountain 14a. Hold the grip 6b of the tightening shaft 6 and rotate it in the direction of the arrow D (FIG. 4) to fit it into the hook 10a of the hook 10. The hook 10 is urged by a spring 17 attached to the outer periphery of a shaft formed on the standing pipe 3, is positioned by a metal fitting 18, and is attached by a screw 19. By the action of the eccentric shaft 6a accompanying the rotation of the tightening shaft 6, the nut 1
2, the front and rear hinges 5a, 5b are fixed. Further, even if the tightening force is weak or the external force is applied to the tightening shaft 6 by the hook 10a, the tightening shaft 6 does not rotate and the connection is not disengaged and is safe.

FIG. 8 shows another embodiment of the positioning and fixing of the tightening bolt 7. Mountain 14a of elastic body 14 is attached to the head of screw 16.
Gets over and fits. Similarly, the same effect can be obtained by providing a projection on the lid.

FIG. 9 shows a plan in which the lid 11 is held and fixed by the elastic body 14. There are two upper and lower ridges 14a, which sandwich the outer shape of the lid 11. The finger hook 11b is provided not on the front but on the side. The fixing is more secure and the structure is simpler than in the first embodiment.

[0013]

[Effect of the Invention] As described above, the fastening mechanism of the folding bicycle according to the present invention has a rotation axis perpendicular to the ground, a fastening axis perpendicular to the frame pipe, and fastening bolts and nuts having substantially the same diameter as the frame pipe. The hinge part has a storage part and is stored in it, so it can be formed small and smooth overall, the outer edge of the hinge is hard to catch on clothes etc., and the appearance is sophisticated .

A cover is put on the nut to close the storage space, so that the appearance is further smoothened.

Further, since a lid or a component which rotates together with the tightening bolt, such as a tightening bolt or a screw, is clamped by an elastic body and stored in the storage space, even if the nut or the like is loosened,
Even if the fixing force of the hinges 5a and 5b is loosened, the hinges 5a and 5b do not come off and are safe.

Since the finger hook portion is provided at the front lower portion in a shape along the hinge of the lid, the appearance is refined, and the finger is easily hooked and operated. When the finger hook is provided on the side of the lid, there is an advantage that the shape is small and it can be realized at low cost.

Further, when the tightening is released, the rotation of the tightening shaft is regulated at a position further rotated from the foremost (upper) position by the projection at the lower portion of the tightening shaft. It is possible to provide a folding bicycle fastening mechanism with improved characteristics.

[Brief description of the drawings]

FIG. 1 is a side view of a frame using a fastening mechanism of a folding bicycle according to an embodiment of the present invention;

FIG. 2 is a plan view of a fastening mechanism of the folding bicycle according to the embodiment of the present invention;

FIG. 3 is a perspective view of the folding bicycle according to the embodiment of the present invention when the fastening is released;

FIG. 4 is a perspective view showing a state in which the folding bicycle according to the embodiment of the present invention is tightened;

FIG. 5 is a right side view of the fastening mechanism of the folding bicycle according to the embodiment of the present invention;

FIG. 6 is a perspective view of a fastening bolt and a nut of the folding bicycle according to the embodiment of the present invention;

FIG. 7 is a perspective view of a fastening bolt and an elastic body when the lid of the folding bicycle according to the embodiment of the present invention is fitted;

FIG. 8 is a front view of a fastening bolt portion of the folding bicycle fastening mechanism according to another embodiment of the present invention at the time of fitting.

FIG. 9 is a partial perspective view of a fastening bolt portion of the folding bicycle according to another embodiment of the present invention when the fastening mechanism is fitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 4 Frame pipe 4a Front frame pipe 4b Rear frame pipe 5 Hinge body 5a Front hinge body 5b Rear hinge body 5c Storage space 6 Tightening shaft 6a Eccentric shaft 7 Tightening bolt 7b Projection 11 Lid 11a Outer wall 11b Finger hook 12 Nut 13 Screw 14 Elastic body 14a Mountain 15 Rotation axis

Claims (4)

(57) [Scope of request for utility model registration] 1. A bicycle frame, comprising:
A pair of hinges rotatably supported in a rotatable manner;
Is rotatably supported by one of the hinges, and the tightening nut is screwed.
At the free end to be attached, it is locked to the other of the pair of hinges.
And a tightening bolt for mutually tightening the pair of hinges.
A fastening mechanism for a folding bicycle, comprising: the other hinge.
And a free end of the tightening bolt and a tightening nut.
Storage space for accommodating at least a part of the bolt, at least the free end side of the tightening bolt and the tightening nut.
An elastic body that elastically holds a part of the storage space.
A folding mechanism for a folding bicycle. 2. A fastening mechanism for a folding bicycle according to claim 1.
And the free end side of the tightening bolt and at least the tightening nut.
In some cases, the protrusion formed at the free end of the tightening bolt has a front end.
The storage space is elastically engaged by engaging with the elastic body.
A folding mechanism for a folding bicycle characterized by being held. 3. A fastening mechanism for a folding bicycle according to claim 1.
And a lid attached to a free end of the tightening bolt, and at least a free end side of the tightening bolt and a tightening nut.
In some cases, the lid is engaged with the elastic body to
Folding characterized by being elastically retained in the storage space
Bicycle fastening mechanism. 4. The fastening mechanism for a folding bicycle according to claim 1,
And a lid attached to a free end of the tightening bolt, and a flat portion formed on the tightening bolt through the lid.
By contact, the lid is moved around the tightening bolt.
While preventing rotation, make sure that the head is
Small screw protruding from the free end side of the tightening bolt and at least the tightening nut.
Partly, the head of the machine screw is engaged with the elastic body
Characterized by being elastically held in the storage space by
Folding bicycle fastening mechanism.