JP2586396Y2 - Joint structure in folding bicycle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a folding bicycle having a quick lever which can be easily tightened or loosened by a simple operation of raising and lowering a lever via a quick housing or the like so that the vehicle body can be folded. An object of the present invention is to easily remove a cam bolt by a quick lever and completely prevent a danger of the frame being bent due to careless removal of the cam bolt.

[0002]

2. Description of the Related Art In recent years, many bicycles are provided with a quick lever so that a simple lever can be easily turned up and down on a folded portion of a vehicle body by simply raising and lowering the lever. It became so.
In particular, with regard to the folding mechanism of the frame pipe in a folding bicycle, a coupling device with a pair of joining lugs that can be folded laterally around the vertical axis is provided in the middle of the frame pipe connecting the head pipe and the vertical pipe. By connecting the opening side of each joining lug with the cam bolt of the adjusting nut, and supporting the base of the cam bolt by the eccentric cam of the base of the quick lever and rotating the quick lever, the eccentric cam of the base A configuration in which the cam bolts are drawn together, fastened together and loosened to open the free end and fold them has been considered.

[0003]

However, in the case of the above-described structure, the tool is not required for tightening with the quick lever, which is simple. On the other hand, even if the quick lever is operated to the loose side, the distance between the cam bolts is reduced. It is difficult for the neck on the adjustment screw side to come off from one end of the hinge opening.Therefore, by loosening the lock screw at the tip excessively, in order to disengage the cam bolt, re-tighten the cam screw by turning the lock screw each time It is necessary to fine-tune the neck length.

[0004] If the adjustment is incomplete, the quick lever cannot be fully rotated and its free end protrudes and is caught on the hem of the pants, or the tightening by the quick lever is loosened. Bicycle frame pipes can bend and pose a serious danger during riding.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned various problems in the prior art, eliminates the need for fine adjustment of the clearance which enables a good tightening of the quick lever, and furthermore, one end of the hinge opening. And the cam bolt can be freely engaged and disengaged within a preferable range of clearance, and further, careless bending of the frame pipe during running is prevented.

More specifically, an L-shaped quick lever that pivots around a rotation shaft having an eccentric cam portion at a base portion, and an eccentric cam of the quick lever are provided on one side of the opening of the frame folding hinge portion. A cam bolt having a spacing adjusting screw portion at the tip, a U-shaped groove for receiving the cam bolt, and a rotatable side of the U-shaped groove. A joint portion in a folding bicycle having a concave groove that is attached and can be fitted into the neck of the cam bolt that has entered the U-shaped groove, and that is attached with a safety lever having a predetermined thickness that is constantly biased in the U-shaped groove direction. Regarding the structure.

[0007]

In the above construction, when assembling the same, the folding hinge portion of the frame is closed, one quick lever is sufficiently rotated to the loose side, and the safety lever having a predetermined thickness set on the other side is moved to the other side. The cam bolt on one side is caused to rotate against the biasing force, and the base of the cam bolt is rotated so that the neck on the free end side (space adjustment screw side) enters the U-shaped groove on the other side. At this time, if necessary, the clearance adjusting nut at the tip is rotated to adjust the clearance between the nut and the outside of the other hinge in advance.

Then, when the safety lever is released, the safety lever falls down in the direction of the U-shaped groove due to the urging force, and the concave groove fits into the neck of the cam bolt located in the U-shaped groove.
In this state, the quick lever is rotated to the tightening side to complete the assembly of the frame. Conversely, when folding the frame, rotate the quick lever to the loose side, raise the safety lever against its urging force, and remove the cam bolt from the U-shaped groove to move the frame to its hinge part. Can be bent.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the present invention will be described below with reference to FIG.
In the description based on the embodiments of Examples 1 to 4, 1 indicates a frame pipe of a bicycle, and 1a is set on one side, 1b is set on the other side, and 1a is set on one side with respect to the folded portion of the frame pipe 1.
The coupling plate 3 on the other side 1b and the coupling plate 10 on the other side 1b form a hinge with one end thereof being freely openable and closable by the shaft 2, and the coupling plate 3 on one side 1a is closer to the opening side. An L-shaped quick lever 4 pivoting about a rotating shaft 3a having an eccentric cam portion 3b at its base, and a cam bolt 5 having a base 5a rotatably supported by the eccentric cam portion 3b of the quick lever 4. Is attached.

Further, a mounting base of the cam bolt 5, that is, a connecting plate 3 which is a piece on the opening side of the hinge portion, has a mounting rotary shaft 3 for mounting a quick lever 4 to be supported by the connecting plate.
a small gap portion 3c is formed at a position corresponding to the eccentric cam portion 3b in FIG.
A biasing means S is provided for constantly pressing the base 5a of the cam bolt 5 loosely fitted in the direction b in the direction of the tip of the cam bolt 5 (the direction of arrow A). As the urging means S, specifically, in the case of the embodiment of FIG. 3, an arc-shaped leaf spring S1 is used, or as shown in FIG. 5, a coil-shaped spring S2 is fitted and used. You may do so.

A U-shaped groove 11 for receiving the neck 6 of the cam bolt 5 is formed on the opening side of the coupling plate 10 on the other side, and a set screw 13 is provided beside the U-shaped groove 11. It is rotatably mounted, and the above U
On the desired side of the U-shaped groove 11, a concave groove 14 that can be fitted into the neck 6 of the cam bolt 5 that has entered the U-shaped groove 11 is formed,
The tip portion is bent at a right angle to form the handle portion 15, and the U-shaped groove 11
A safety lever 12 having a predetermined thickness biased in the direction is attached.

The cam bolt 5 has a threaded portion 7 formed at the tip thereof, and furthermore, spacing adjusting nuts 8 and 9 are screwed into the threaded portion 7, so that the connecting plates 3 and 10 are overlapped. In this state, the cam bolt 5 is rotated to cause the neck 6 to enter the U-shaped groove 11 of the coupling plate 10 and the safety lever 12 is rotated to rotate the concave groove 1.
In a state where the nut 4 is engaged with the neck 6 of the cam bolt 5, the quick lever 4 is rotated to the tightening side, held at a predetermined position, and the interval adjusting nut 8 is securely tightened to easily perform the adjusting operation. it can.

Further, the adjusting nut is fixed by a double nut configuration of a spacing adjusting nut 8 and a lock nut 9 in order to prevent the adjusting nut from being loosened. In the above configuration, when the frames 1a and 1b are assembled so as to be linear, the folding hinge portion of the frame, that is, the coupling plates 3 and 10 are closed with the shaft 2 as a fulcrum and the quick lever 4 on the coupling plate 3 side is closed. Is fully rotated to the loosening side, then the safety lever 12 on the other side of the coupling plate 10 is raised against its urging force, and the cam bolt 5 on the side of the coupling plate 3 is further rotated by rotating its base 5a to the free end. Connect the side neck 6 to the connecting plate 1
It enters the U-shaped groove 11 of 0.

At this time, if necessary, the clearance between the gap adjusting nut 8 and the outside of the coupling plate 10 is adjusted in advance by rotating the gap adjusting nut 8 and the lock nut 9 at the tip. In this case, as described above, the gap 3c is formed in the coupling plate 3 on one side of the hinge, and the base 5a of the cam bolt 5 loosely fitted to the eccentric cam 3b in the gap 3c.
When the urging means S is constantly pressed in the direction of the tip of the cam bolt 5 (in the direction of arrow A), the gap adjusting nut 8 may hit the corner near the entrance of the U-shaped groove 11. Therefore, the entry into the U-shaped groove can be made extremely smooth.

Then, when the safety lever 12 is released, the safety lever 12 rotates in the direction of the U-shaped groove 11 by the urging force,
The concave groove 14 fits on the peripheral surface of the neck 6 of the cam bolt 5 located in the U-shaped groove 11. In this state, the quick lever 4 is rotated to the tightening side so that the frame 1
Complete assembly of The safety lever 12 has a certain thickness necessary for easily turning the cam bolt 5 and removing it from the U-shaped groove 11 without loosening the adjusting nut 8 of the cam bolt 5.

On the other hand, when the frame 1 is folded, the quick lever 4 is rotated to the loose side, the safety lever 14 is raised against the urging force, and the cam bolt 5 is removed from the U-shaped groove 11. Thus, the frame 1 can be bent at the hinge portion formed by the coupling plates 3 and 10 with the directions of the center axes of the frames 1a and 1b being different from each other around the shaft 2.

[0017]

As described above, according to the present invention, an L-shaped quick lever which pivots around a rotary shaft having an eccentric cam at its base is provided on one of the opening sides of the frame folding hinge, and the quick lever is provided. The eccentric cam portion has a base portion rotatably supported, and further has a cam bolt having a gap adjusting screw portion at the tip thereof, and a U-shaped groove for receiving the cam bolt on the other piece, and a side of the U-shaped groove. And a safety lever having a predetermined thickness, which is rotatably mounted on the U-shaped groove and which can be fitted into the neck of the cam bolt which has entered the U-shaped groove, and which is constantly urged in the U-shaped groove direction. Therefore, when operating the quick lever when folding or assembling the frame, the cam nut can be smoothly moved in and out of the U-shaped groove without loosening the adjustment nut of the cam bolt. Turn each time adjustment nut eliminates the need for fine adjustment of the length of the neck of the cam bolt, the operability is remarkably improved.

Further, since the length of the neck of the cam bolt is always constant, the tightening force of the quick lever is also constant, and as a result, there is a danger that the free end of the quick lever cannot be fully rotated and the free end projects and is caught on the hem of the pants. Is completely eliminated. Furthermore, the tightening force by the quick lever is ensured. Also, even if the tightening force of the quick lever is loosened and the quick lever is accidentally rotated to the loose side, the neck of the cam bolt is completely supported by the recess of the safety lever, so the bicycle is unexpectedly folded during traveling There is no risk that the frame pipe will bend and cause an unexpected accident.

Further, when a gap is formed in the coupling plate on one side of the hinge, and biasing means for constantly pressing the base of the cam bolt loosely fitted to the eccentric cam in the gap in the tip direction of the cam bolt is provided. Does not cause the gap adjusting nut to hit the corner near the entrance of the U-shaped groove,
The operation of entering and removing the U-shaped groove can be performed extremely smoothly.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view of an essential part of a joint part structure of a folding bicycle according to an embodiment of the present invention, in a state where joining by a cam bolt is released.

FIG. 2 is an enlarged perspective view of a main part showing a state of the joint in FIG. 1 after joining with a cam bolt and a quick lever.

FIG. 3 is a front view, partially in section, showing a state of joining by a cam bolt and a quick lever.

FIG. 4 is a side view, partially in section, showing the state of attachment of the safety lever at the joint.

FIG. 5 is a partially enlarged cross-sectional view showing another embodiment of a cam bolt mounting portion in the joint shown in FIGS.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame pipe 2 Shaft 3 Coupling plate 3a Rotating shaft 3b Eccentric cam part 4 Quick lever 5 Cam bolt 6 Neck 7 Screw part 8 Interval adjustment nut 9 Lock nut 10 Coupling plate 11 U-shaped groove 12 Safety lever 13 Set screw 14 Concave groove 15 Handle part 16 Spring

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B62K 15/00

Claims (1)

(57) [Scope of request for utility model registration] An L-shaped quick lever that pivots around a rotation shaft having an eccentric cam portion at a base portion is provided on one side of an opening side of a frame folding hinge portion. The base of the cam bolt having an adjusting screw portion at the tip is rotatably supported, and the other piece has a U-shaped groove for receiving the cam bolt, and the U-shaped groove is inserted beside the U-shaped groove. A joint structure in a folding bicycle having a safety lever having a predetermined thickness, which has a concave groove which can be fitted into a neck portion of a cam bolt and is always urged in a U-shaped groove direction.