CN2177669Y

CN2177669Y - Mechanism for tightly fixing crank

Info

Publication number: CN2177669Y
Application number: CN 93244919
Authority: CN
Inventors: 赵志坚
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-11-15
Filing date: 1993-11-15
Publication date: 1994-09-21
Anticipated expiration: 2003-11-15

Abstract

The utility model relates to a crank fastening mechanism, particularly a crank fastening mechanism for bicycles and tricycles. The utility model is characterized in that a blind hole is arranged beside the hole of the centre shaft of the original crank, a through hole which can be used for placing a cushion block is arranged between the blind hole and the hole of the centre shaft, and an eccentric wheel arranged in the blind hole is rotated to press the cushion block tightly to fasten the centre shaft. The utility model has the advantages of compact structure, convenient assembly and disassembly, high intensity, safety, etc., and the fastening of the crank is firm.

Description

Mechanism for tightly fixing crank

The utility model relates to crank and tighten up mechanism, especially the crank of bicycle, three-wheel vehicle tightens up mechanism.

Existing crank tightens up mechanism various ways, it generally is the flat horizontal surface place that is fixed tightly in axis two ends with the crank pin, because the two ends of pin all exceed the crank outer rim, when riding, tangle trousers mouth easily, dangerous, and since the very difficult formation face of pin angular plane surface and axis flat horizontal surface contact, cause discontinuity, easily loosening, beat the damage that also easily causes pin when loading and unloading in addition.

The objective of the invention is to overcome above disadvantage, provide a kind of and compress cushion block to axis flat horizontal surface place, thereby tighten up the mechanism that tightens up of axis by the eccentric wheel that is located in the crank central axis hole side blind hole.

Task is finished like this: central axis hole one side at crank is shaped on a blind hole parallel with its center, be shaped on the through hole of laying cushion block between blind hole and the central axis hole, can put into eccentric wheel in the blind hole, the eccentric wheel center is shaped on triangle, quadrangle or hexagonal auxiliary hole, in blind hole, put into earlier eccentric wheel during use, in central axis hole, put into cushion block again, again axis is packed into, crank is fastened at axis thereby can make eccentric wheel compress cushion block with instrument rotating technics hole.

In order to prevent that the silt dust from entering eccentric wheel, can install gland in the blind hole peristoma.

In order to lock eccentric wheel, can make the multi-faceted column with eccentric wheel auxiliary hole running-fit in the gland inboard, the center is drilled with screw hole, the gland outer rim is shaped on the R v notch v identical with the axis external diameter, after compressing axis, is pressed into gland, use screw in compression again on crank, just reach the purpose of interlocking.

Fig. 1 is crank and axis mounting structure front elevation.

Fig. 2 is crank and axis mounting structure top plan view.

The invention will be further described below in conjunction with drawings and Examples.

Referring to Fig. 1, Fig. 2, central axis hole 2 one sides at crank 1 are shaped on the blind hole parallel with its center 4, be shaped on the through hole 3 that cushion block 6 is installed between blind hole 4 and the central axis hole 2, eccentric wheel 7 is shaped on hexagon auxiliary hole 5 with blind hole 4 running-fits and center, gland 8 inboard centers are shaped on can be by six cylinders of screw 9 with auxiliary hole 5 running-fit centers, and the bottom centre of blind hole 4 is shaped on the tapped bore that cooperates with screw 9 on crank 1.Gland 8 outer rims are shaped on and the identical R v notch v in central axis hole 2 outer gardens, during installation, in blind hole 4, put into earlier eccentric wheel 7, in central axis hole 2, put into cushion block 6, the axis of packing into then makes cushion block 6 fall into axis termination flat horizontal surface, can compress cushion block 6 with wrench rotating technics hole 5 and tighten up axis, put into gland 8 again, insertion screw 9 screws and gets final product.

Obvious, the utility model compact conformation, novelty, practical, fastening firm to crank, easy installation and removal, it is good to have intensity, and the scope of application extensively reaches the characteristics such as safe and reliable.

Claims

1, a kind of crank tightens up mechanism, a side that it is characterized in that the central axis hole 2 on crank 1 is shaped on the blind hole parallel with its center 4, be shaped on the through hole 3 of laying cushion block 6 between blind hole 4 and the central axis hole 2, eccentric wheel 7 is shaped on auxiliary hole 5 with blind hole 4 running-fits and center, and the peristoma of blind hole 4 is provided with gland 8.

2, crank according to claim 1 tightens up mechanism, it is characterized in that auxiliary hole 5 can be triangle, quadrangle, also can be hexagon.

3, tighten up mechanism according to claim 1,2 described cranks, it is characterized in that gland 8 inner faces make with eccentric wheel 7 in auxiliary hole 5 running-fit multi-faceted columns, hole, blind hole 3 bottom centre that screw 9 can be passed in the center are shaped on the tapped bore that cooperates with screw 9, and gland 8 outer rims are shaped at least one and the identical R v notch v in central axis hole 2 outer gardens.