Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
  • B62L1/00—Brakes; Arrangements thereof
  • B62L1/02—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements
  • B62L1/06—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements the wheel rim being engaged
  • B62L1/10—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements the wheel rim being engaged by the elements moving substantially parallel to the wheel axis
  • B62L1/14—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements the wheel rim being engaged by the elements moving substantially parallel to the wheel axis the elements being mounted on levers pivotable about different axes

Definitions

• the present invention relates to a return squeeze adjustment structure for a brake device used for a bicycle.
• a power-type or center-type brake system is equipped with a pair of left and right brake arms that can rotate on the support shafts of the left and right brake arm mounting bases fixed to the front fork of the bicycle.
• a return spring is interposed between each brake arm and the mounting pedestal, and both ends of this return spring are locked to the brake arm and the mounting pedestal, respectively, so that the left and right brake arms are The left and right brakes are set so that the provided brake shoes separate from the wheel rim.
• Japanese Unexamined Utility Model Publication No. 63-992 and U.S. Pat. No. 4748553 have disclosed structures in which the return spring by the return spring can be adjusted.
• one end of the return bridge is locked on the mounting base side, and the other end of the return spring is locked on a transmission provided on the brake arm side, and this transmission is connected to the brake arm side.
• the rotation is adjusted by the adjustment screw provided on the brake. Yone (return spring force) is being adjusted.
• the adjustment of the return spring can be performed by simply moving the adjustment screw forward and backward with the other end of the return spring abutting on the tip of the adjustment screw. Simply contacting the screw with the flat ends may cause the ends to shift laterally and become unadjustable. Therefore, interposing a transmission body as in the prior art is effective in performing reliable adjustment.
• a return spring force adjustment of a bicycle brake device that can solve the above-described problems of the related art by forming a fitting portion for directly fitting an end of a return spring at a tip of an adjustment screw. It aims to provide structure.
• the present invention has taken the following technical means to achieve the above object.
• the brake arm and the return spring are fitted on the support shaft of the mounting pedestal fixed to the vehicle body, and one end of the return spring is engaged with one of the mounting pedestal and the brake arm, and the other end is engaged with the other side.
• the adjusting screw was screwed and supported, and the other end of the return bridge was in contact with the tip of the adjusting screw.
• a fitting portion is provided at a tip of the adjusting screw to be fitted to the other end of the return spring to prevent lateral displacement.
• the end of the return spring is fitted into a fitting portion provided at the tip of the adjusting screw, so that there is no lateral displacement, and the adjusting screw is directly and securely inserted into the end of the return spring.
• the degree of tension can be adjusted by transmitting the magnitude of the movement of the motor, and the adjusting force can be reduced as compared with the conventional technology using a transmission body.
• FIG. 1 is an exploded perspective view
• FIG. 2 is a sectional explanatory view
• FIG. 3 is a sectional view taken along line m--m of FIG. Fig. 4 is an exploded perspective view of the main part.
• FIG. 6 is an exploded perspective view and a sectional view showing the second embodiment. 9 show the third embodiment, FIG. 7 is an exploded perspective view, FIG. 8 is a sectional front view, FIG. 9 is a partial sectional side view, and FIG. FIG. 2 is a perspective view of the anti-brake device.
• Fig. 10 shows the entirety of the cantilever brake system 1.
• a pair of left and right mounting pedestals 3 is welded or bolted to the front fork of the bicycle body 2, and one end of the brake arm 4 is attached to the support shaft of each of the left and right mounting pedestals 3. It is pivoted.
• the other end of the brake arm 4 is connected to the suspension gear 5, and the brake arm 4 has a brake shoe 8 in contact with the rim of the wheel in the middle, and the support shaft of the mounting base 3 is connected via a pull wire 9.
• the brake shoe 18 is pressed against the rim to perform a braking operation, and is separated from the rim by a return spring 10 described later.
• left and right brake devices 1 have a symmetrical structure, and the coil winding direction of the return spring 10 is reversed.
• the mounting pedestal 3 includes a fixed portion 3A fixed to the vehicle body 2, a flange portion 3B, a stepped shaft portion 3C, and a female screw portion at the tip.
• a bush 11 is fitted on the small-diameter shaft side of the support shaft portion 3C, and a brake arm 4 is rotatably fitted on the outer periphery thereof.
• the return spring 10 has a coil shape, is fitted on the outer periphery of the bush 11 and is located in a circular recess 13 surrounding the bush 11 of the brake arm 4, and one end 10A of the return spring 10 is a recess. It is locked by a blind hole-shaped locking portion 14 provided at the bottom of 13.
• a disk-shaped support disk 15 is fitted on the outer periphery of the large-diameter shaft side of the support shaft portion 3C, and the outer periphery of the support disk 15 is bent in the opposite direction to each other on the diameter. Then axial And a screw screwing piece 17 provided with a female screw hole in the vertical direction.
• the stopper 16 is engaged with an engaging portion 18 formed on the flange portion 3B to stop the support disk 15 from rotating with respect to the support shaft portion 3C.
• the engaging portion 18 is formed by forming a through hole or a notch in the flange portion 3B, or by forming a flat portion on the outer periphery of the flange portion 3B.
• An adjusting screw 19 is screwed into the screw screwing piece 17, and the adjusting screw 19 has a square hole 19A for engaging a rotating tool such as a key wrench at the base end, and a fitting portion 20 at the head. Is provided.
• the fitting portion 20 has a concave portion 20A opened on the top surface, and is fitted to the other end 10B of the return spring 10 described above. Therefore, when the adjusting screw 19 is rotated to advance and retreat with respect to the screw threading piece 17, the reciprocating movement causes the return spring 10 to deform so as to expand and contract the coil diameter, and the brake arm to the mounting base 3 4 The return spring force is adjusted.
• Reference numeral 21 denotes a cylindrical dust cover for preventing dust from entering between the brake arm 4 and the support disk 15, one end of which is fitted into the inner peripheral surface of the recess 13 of the brake arm 4, and the other end of which is a support disk.
• a screw surrounding part 22 is formed in the middle part in contact with the disc 15.
• a set screw 26 is screwed into the female screw portion 3D of the mounting base 3, and a retaining washer 25 for the brake arm 4 is attached.
• the washer 25 may be formed integrally with the set screw 26.
• the adjusting screw 19 is screwed to the mounting base 3, and therefore, the support disk 15 is not provided, and the support disk 15 is not provided.
• a screw threaded piece 17 may be formed to project from the flange portion 3B.
• the brake arm 4 is formed with a key-shaped recess 29 composed of a circular recess 13 surrounding the support shaft 3C and a square recess 28 communicating therewith.
• a female screw hole 30 into which the adjusting screw 19 is screwed is formed in a side wall forming the concave portion 28 in a penetrating manner.
• the adjusting screw 19 has the same diameter as the overall length, and has a concave fitting that locks the engaging square hole 19A of the rotating tool 31 on the outer end face and the one end 10A of the return spring 10 on the inner end face.
• a part 20 is formed.
• the other end 10B of the return spring 10 is locked in a hole 32 of a cylindrical dust cover 21.
• One end of the dust cover 21 is fitted on the inner circumferential surface of the concave portion 13 of the brake arm 4, and a detent projection 16 provided on the other end of the brake arm 4 is engaged with the flange 3 B of the mounting base 3. It is engaged with the joint 18. Therefore, the end of the return spring 10 is locked on the mounting base 3 side.
• the tip of the adjusting screw 19 and the return Engagement with the end of the wing 10 is ensured by the fitting portion 20, and there is no lateral displacement or detachment.
• FIGS. 7 to 9 show a third embodiment, in which a return bearing 10 is located on the side of the brake arm 4 and is surrounded by a dust cover 21, one end 10A of which is elongated in the radial direction. It protrudes and is inserted into a concave portion 34 formed on the halfway side surface of the brake arm 4.
• An adjusting screw 19 is screwed into a side wall forming the concave portion 34 of the brake arm 4.
• the tip of the adjusting screw 19 is located in the concave portion 34 and has a fitting member 20 having a blind hole-shaped fitting portion 20. 35 are provided.
• one end 10A of the return spring 10 is fitted to the fitting portion 20, so that the return spring 10 is pushed by the advance and retreat of the adjusting screw 19, and the return spring provided to the brake arm 4 is provided. To adjust.
• the present invention is not limited to the above embodiment, but can be variously modified, and the applicable brake device type is not limited to the cantilever type.
• the return spring force adjusting structure of the bicycle brake device of the present invention can be used for a cantilever type and a center type carrier brake.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Braking Arrangements (AREA)
• Springs (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=12578103

Family Applications (1)

Country Status (5)

Families Citing this family (18)

Citations (3)

Family Cites Families (13)

• 1989
  • 1989-04-04 JP JP1989040347U patent/JPH02129985U/ja active Pending
• 1990
  • 1990-04-02 US US07/613,707 patent/US5152377A/en not_active Expired - Fee Related
  • 1990-04-02 EP EP19900905651 patent/EP0432268A4/en not_active Ceased
  • 1990-04-02 KR KR1019900702553A patent/KR950001105B1/ko not_active IP Right Cessation
  • 1990-04-02 WO PCT/JP1990/000449 patent/WO1990011926A1/ja not_active Application Discontinuation

Patent Citations (3)

Non-Patent Citations (1)

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