CN2286135Y

CN2286135Y - Locking device of handle-bar stem for bicycle

Info

Publication number: CN2286135Y
Application number: CN 96221717
Authority: CN
Inventors: 廖学湖
Original assignee: XINLONG BICYCLE PARTS (SHENZHEN) CO Ltd
Current assignee: XINLONG BICYCLE PARTS (SHENZHEN) CO Ltd
Priority date: 1996-08-30
Filing date: 1996-08-30
Publication date: 1998-07-15
Anticipated expiration: 2006-08-30

Abstract

The utility model relates to a locking device of a vertical pipe of a handle bar for bicycles, which is that the upper part and the lower part are locked by screws. The utility model is characterized in that an arc-shaped sheet whose inner side is provided a tooth is butted and welded in a central groove an upper cover body 3 made of iron materials to increase locking stressed areas; stress direction is made to be on the arc-shaped sheet; the upper cover can be locked with reliable strength; the handle bar can not be caused to be damaged by the pressure on the end faces of both sides of the handle bar; the upper cover body 3 made of iron materials can not have pores or interstices caused of the existing compression casting aluminium alloy, and therefore, the strength of products is ensured.

Description

The cycle arm pipe locking device

The utility model belongs to the improvement of bicycle assembly parts structure, is specifically related to a kind of improvement of cycle arm pipe locking device.

Existing bicycle handle bar standpipe catch gear, as shown in Figure 3, the standpipe lower base is that iron plate and tubing are welded into one, its upper cover body is the aluminium alloy compression casting body, because the problem on the manufacturing technology, material density is not enough, has space and pore unavoidably, be provided with a groove because of the loam cake center again, the thinner thickness of groove adds that again the aluminium alloy compression casting product are more crisp, therefore, intensity is difficult to guarantee that the danger of fracture is arranged at any time.

The utility model is at the deficiency of above-mentioned existing bicycle handle bar standpipe locking mechanism, and purpose is to provide a kind of safe and reliable, cycle arm pipe locking device that intensity is higher.

Cycle arm pipe locking device of the present utility model, comprise lower base and upper cover body, lower base comprises following, montant, outer-hexagonal plug, faced washer and the core nut, upper cover body comprises loam cake, the square lead screw of round end, opening pad and outer-hexagonal nut, it is characterized in that in the central recess of iron material matter upper cover body, having in the butt-joint one arc-like sheet of groove, be cut into 35 ° inclined-plane in the montant lower end, its upper end is welded into one with the reinforcing chip of a following triangular shape, four holes of following seat are connected locking with loam cake, another hole is connected locking with the front fork of bicycle.

The reinforcing chip of montant upper end and triangular shape between following be used for protecting montant with following.

The arc-like sheet of groove is arranged in one of the butt-joint in the loam cake central recess, be used for strengthening the locking area, and than upper cover body both sides height, the pressure during locking unlikelyly makes handlebar be subjected to the pressure of upper cover body both sides end face and causes fracture on arc-like sheet.

Compare with existing cycle arm pipe locking device, cycle arm pipe locking device of the present utility model, because the arc-like sheet of groove is arranged in the butt-joint one in the central recess of upper cover body, the area of thrust surface of locking have been increased, and make and be subjected to force direction on arc-like sheet, both can make loam cake locking intensity more reliable, unlikely again handlebar is subjected to the pressure of both sides end face and the destruction of causing handlebar; The pore or the space that cause existing pack alloy sheet material matter can not appear and in the upper cover body that iron material matter is made, and have therefore guaranteed the intensity of product.

Below in conjunction with accompanying drawing cycle arm pipe locking device of the present utility model is described further:

Fig. 1 is the mounting structure scheme drawing of cycle arm pipe locking device of the present utility model.

Fig. 2 is the assembling scheme drawing of the utility model cycle arm pipe locking device and handlebar.

Fig. 3 is existing handlebar stem locking mechanism scheme drawing.

As shown in Figure 1, cycle arm pipe locking device of the present utility model, comprise lower base and upper cover body, lower base comprises following 2, montant 1, reinforcing chip 4, outer-hexagonal plug 5, flat pad 6 and core nut 7, the montant 1 and external diameter of core nut 7 is slightly less than the front fork aperture, like this, be convenient to the locking of standpipe and front fork; Upper cover body comprises that loam cake 3, arc draw tooth reinforcing chip 3-1, the square lead screw 8 of round end, open washer 10 and outer-hexagonal nut 9.

As shown in Figure 2, the lower base of cycle arm pipe locking device I of the present utility model and upper cover body are separately, the center of handlebar is placed the groove of lower base, again the groove of upper cover body is placed the center of handlebar II, and arc-like sheet is attached on the handlebar, upper cover body both sides end face and handlebar have certain space, and upper cover body has four square openings, are used for four square lead screw of round end of injection, so, available square opening is located, and lead screw is passed through lower base, refills open screw, be winched into the outer-hexagonal nut, like this, handlebar II be subjected to upper cover body and lower base to pressing, lock by four square lead screw of round end.

Claims

1. cycle arm pipe locking device, comprise lower base and upper cover body, lower base comprises following (2), montant (1), outer-hexagonal plug (5), flat pad (6) and core nut (7), upper cover body comprises loam cake (3), the square lead screw of round end (8), open washer (10) and outer-hexagonal nut (9), it is characterized in that in the central recess of iron material matter upper cover body, having in the butt-joint one arc-like sheet (3-1) of groove, be cut into 35 ° inclined-plane in the montant lower end, its upper end is welded into one with the reinforcing chip (4) of a following triangular shape, four holes of following seat are connected locking with loam cake, another hole is connected locking with the front fork of bicycle.