CN2174400Y

CN2174400Y - Chain guard for variable-speed bicycle

Info

Publication number: CN2174400Y
Application number: CN 93229479
Authority: CN
Inventors: 刘书生
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-15
Filing date: 1993-10-15
Publication date: 1994-08-17
Anticipated expiration: 2003-10-15

Abstract

The utility model provides a chain guard for variable-speed bicycles, which belongs to a chain guard for bicycles. The utility model is mainly composed of a vertical plate 1, an upper cover 2 connected with the vertical plate 1, a front cover 5, and clamps 6 and 4 which are used for fixing the vertical plate 1 and the front cover 5. The utility model is characterized in that a split part 7 is arranged at the front part of the vertical plate 1; the split part 7 is connected with the front cover 5. The utility model has the advantages of easy fabrication and time saving in installation, and does not adjust space.

Description

Chain guard for variable-speed bicycle

The utility model belongs to a kind of cycle chain protective device, particularly relates to a kind of variable speed bicycle chain cover.

Bicycle chain box mainly contains two kinds, a kind of is closed chain cover, drive sprocket, driven sprocket and chain are all wrapped in the inside, this chain cover can make sprocket wheel and chain avoid dust and stain, reduce the wearing and tearing that transmission is paid, can avoid greasy dirt to be stained with on the trousers angle, but this chain cover is not suitable for variable speed bicycle yet.Another kind is the open type chain cover, just with on drive sprocket and the top chain guard.The another kind of form of open type chain cover is made up of two parts, mainly be applicable to variable speed bicycle, owing to be two compositions separating, in that to add man-hour cumbersome, also need to consider its relative position during installation, too far away as two spacings, the chain exposed part is strengthened, influence the shade quality,, influence speed change again and stir the pawl normal operation as too near.

The purpose of this utility model provides a kind of easy to process, integral type variable speed bicycle chain cover that result of use is good.

Technical solution of the present utility model is: a kind of variable speed bicycle chain cover, upper cover 2, front cover 5 and the fixed board 1 that joins by riser 1, with riser 1 and the clip 6 and 4 of front cover 5 are formed, it is characterized in that: the front portion of riser 1 has a long and narrow part 7, long and narrow part 7 and front cover 5 to join.

Long and narrow part 7 and front cover 5 rectangular shapes on the described riser 1.

The utility model compared with prior art has convenient processing and manufacture, install and to save time, and need not adjust spacing, advantage that result of use is good.

Fig. 1 is that the utility model is contained in the structural representation on the bicycle;

Fig. 2 is an axonometric drawing of the present utility model shown in Figure 1;

Fig. 3 is an A-A section-drawing of the present utility model shown in Figure 2;

Fig. 4 is a B-B section-drawing of the present utility model shown in Figure 2.

Below in conjunction with drawings and Examples the utility model is described further: a kind of variable speed bicycle chain cover, upper cover 2, front cover 5 and the fixed board 1 that joins by riser 1, with riser 1 and the clip 6 and 4 of front cover 5 are formed, it is characterized in that: the front portion of riser 1 has a long and narrow part 7, long and narrow part 7 and front cover 5 to join.

As shown in Figure 2: selecting thickness for use is that 0.8 millimeter A3 steel plate is the material of chain cover, adopts the compression moulding on compression machine of special-purpose mold, makes riser 1 and upper cover 2 and front cover 5 shape (shown in Fig. 3,4) that meets at right angles.Clip 4 and 6 is fixed on the relevant position of front cover 5 and riser 1 with rivet respectively, clip 4 is fixed on the preceding cant beam of bicycle main car frame with screw, with clip 6 being fixed on the cross sill of bicycle main car frame with quadrat method, make riser 1,

upper cover

2,5 three formed square grooves 8 of front cover just be positioned at speed change and stir pawl 3 places simultaneously, speed change is not stirred the activity of pawl 3 when as shown in Figure 1, not influencing speed change.So promptly guarantee the shade of sprocket wheel, chain, normal operation when guaranteeing speed change again.

Claims

1, a kind of variable speed bicycle chain cover, upper cover [2], front cover [5] and the fixed board [1] that joins by riser [1], with riser [1] and clip [6] and [4] of front cover [5] are formed, and it is characterized in that: the front portion of riser [1] has a long and narrow part [7], long and narrow part [7] and front cover [5] to join.

2, variable speed bicycle chain cover according to claim 1 is characterized in that: long and narrow part ［ 7 ］ on the described riser ［ 1 ］ and the rectangular shape of front cover ［ 5 ］.