JPH0622185U - Bicycle drive structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bicycle drive structure that is easy to assemble or disassemble. [Structure] The bicycle drive structure is a quadrilateral in which a shell (5), a pair of plugs (1) each having a body (11) inserted into the end of the shell, and a quadrangular hole (22) are formed. A disc (2) having a protrusion (21) in the central part, a long crank (3) and a short crank (4)
With. A pedal is attached to one end of the long crank (3) and a shank for insertion into the shell is provided at the other end. Shank on first shoulder (31)
And a second shoulder (32) and a square post (33)
And a hole (34) along the axis. The short crank (4) has a pedal at one end and a square portion (41) with a square hole (411) for receiving a square protrusion (21) of the disc at the other end.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bicycle drive structure.

[0002]

[Prior art]

 The conventional drive structure of a bicycle comprises an axis A 1 which is inserted in a bearing B, a cap C and a ring D and which is tightened by a screw A1 and an internal screw A2, as shown in FIG.

[0003]

[Problems to be solved by the device]

 The drive structure is labor intensive to assemble and impractical.

An object of the present invention is to provide a bicycle drive structure that is easy to assemble or disassemble.

Another object of the present invention is to provide a more rigid bicycle drive structure.

Yet another object of the present invention is to provide a bicycle drive structure that is inexpensive to manufacture.

[0007]

[Means for Solving the Problems]

 The present invention is a bicycle drive structure including a shell, a pair of plugs, a disc, a long crank, and a short crank. Each of the pair of plugs includes a cylindrical main body having a hole along the axis, which is inserted into the shell from the end of the shell, an enlarged portion of one end, and the one end. With a protruding flange. The disc has a square portion with a square hole protruding from the central portion. The long crank has a pedal attached to one end and a shank at the other end that is inserted into the shell, the shank preventing the long crank from being pushed further in. A shoulder, a second shoulder to prevent further movement of the disc, and a square post at the end of the second shoulder, inserted into the square hole of the disc. , And a hole along the axis. The short crank consists of a pedal mounted on one end, a square hole formed on the other end for receiving the square protruding portion of the disc, and an axis for receiving the bolt. And a hole along with.

[0008]

【Example】

 As shown in FIGS. 1 and 2, the bicycle driving structure according to the present invention is inserted into a shell 5 having a hole along an axis and four connection ports, and an end portion of the hole of the shell 5, respectively. It consists of a pair of plugs 1, a disc 2, a long crank 3 and a short crank 4.

The pair of plugs 1 are the same, and each plug 1 has a cylindrical main body 11, a hole 12 along the axis, a plurality of reinforcing ribs 13 on the inner peripheral portion, and an enlarged one end portion. And a flange 15 extending from the enlarged portion 14. The outer diameter of the cylindrical body 11 is dimensioned slightly smaller than the inner diameter of the hole for insertion into the hole of the shell 5.

A square portion 21 projects from the central portion of the disk 2, and a square hole 22 is formed in this portion 21.

The long crank 3 is L-shaped and has a pedal attached to one end. The other end of the crank 3 has a long shank adapted to be inserted into the hole 12 of one plug 1, the shell 5 and the hole 12 of the other plug 1. This shank consists of a first shoulder 31 that keeps the crank 3 from being pushed further into the hole, a second shoulder 32 that keeps the disc 2 in place, and a square post on one end. 33, a hole 34 along the axis for receiving the bolt 6, and a socket portion 341 at the other end. The outer diameter of the shank portion of the crank 3 is slightly smaller than the inner diameter of the hole 12 for insertion into the hole 12 of the plug and is dimensioned to extend through the square hole 22 of the disc 2. .

The short crank 4 has a pedal connected to one end and a square portion 41 integrally formed at the other end. The square portion 41 has a square hole 411 for receiving the square portion 21 of the disc 2 and the long crank square post portion 33. A hole 42 is provided along the axis of the crank 4 and a hexagonal recess 421 is formed to receive the nut 61.

When assembling, first the two plugs 1 are pressed and fitted into the two ends of the shell 5 respectively until the enlarged part 14 fits snugly with the shell 5. After inserting the long crank 3 into the pair of plugs 1, the post 2 is pushed into the square hole 22 of the disc 2 to couple the disc 2 and the long crank 3 together. The short crank 4 is then pressed against the disc 2 by pressing the square hole 411 against the square portion 21. Finally, the bolt 6 is inserted into the hole 34 of the long crank 3 and screwed into the nut 61 fitted in the hexagonal recess 421 to tighten it.

It is noted that the disc 2 and the long crank 3 are not in direct contact with the shell 5 and thus may reduce wear.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a drive structure for a bicycle according to the present invention.

2 is a front view in which a part of the drive structure of the bicycle shown in FIG. 1 is shown in section.

FIG. 3 is an exploded perspective view of a conventional drive structure.

[Explanation of symbols]

 1 Plug 2 Disc 3 Long Crank 4 Short Crank 5 Shell 11 Body 14 Enlarged Part 15 Flange 21 Square Part 22 Square Hole 31 First Shoulder 32 Second Shoulder 33 Square Post 41 Square Square

Claims (1)

[Scope of utility model registration request] 1. A drive structure for a bicycle comprising a shell, a pair of plugs, a disc, a long crank and a short crank, each of the pair of plugs extending from an end of the shell to the shell. Inserted, has a cylindrical body having a hole along the axis, an enlarged portion of one end portion, and a flange protruding from the one end portion, the disk is projected from the central portion, square Having a square section with a hole formed in it, the long crank having a pedal attached to one end and a shank at the other end inserted into the shell, the shank comprising:
A first shoulder to prevent further pushing of the long crank, a second shoulder to prevent further movement of the disc, and a second shoulder inserted into the square hole of the disc A square post at the end of the shoulder and a hole along the axis, wherein the short crank has a pedal mounted at one end and a square hole for receiving the square protruding portion of the disc. A drive structure for a bicycle, having a portion formed at the other end formed with a groove and a hole along an axis for receiving a bolt.