CN2254864Y

CN2254864Y - Bicycle double-lever braking device

Info

Publication number: CN2254864Y
Application number: CN 96229423
Authority: CN
Inventors: 张文湧
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-03-08
Filing date: 1996-03-08
Publication date: 1997-05-28
Anticipated expiration: 2006-03-08

Abstract

The utility model relates to a bicycle double-lever braking device, which comprises two zygomorphic braking bodies. The parts of the braking bodies corresponding to a bicycle wheel ring are correspondingly, respectively and fixedly provided with a braking order sending plate. A bounding expansion component used for outward bounding expansion is arranged between the two braking bodies, wherein, each braking body is composed of a first lever, a second lever, a connecting rod and a fixed arm. One end of each first lever is fixedly connected with a braking wire, the other end is provided with a fulcrum and the center is pivoted with one end of the connecting rod. One end of each second lever is pivoted with the other end of the connecting rod, the other end is also provided with a fulcrum and a center presetting position is fixedly connected with the braking order sending plate. The device can increase the braking force to enable the braking operation to be reliable and the riding operation to be safe.

Description

The multiple lever brake gear of bicycle

The utility model relates to a kind of bicycle brake device, refers to a kind of multiple lever brake gear especially.

The existing structure of commonly using brake, as shown in Figure 1, brake body 1 top is provided with a perforation 2, uses affixed brake cable 3, forms a point of application; Lining assembly 40 passes the perforation 6 of bolt 4 one ends with bolt 41, and the perforation 5 of affixed what brake body 1 forms a resistance points; Perforation 7 with brake body 1 wears what jack-post 10, forms a fulcrum.

Its structure of aforementioned brake system with brake body 1 as lever 100, perforation 7 as fulcrum 700, perforation 2 as the point of application 200, perforation 5 as resistance points 500, as shown in Figure 2.When brake makes Lining 42 clipping wheel rims 60, and the angle of the pulling force A of cable wire 3 and force arm a is θ, and wheel rim 60 is vertical with force arm b by the Lining 42 drag B that executes, if having after lever 100 reaches statical equilibrium:

aAcosθ＝bB

If the pulling force A with cable wire 3 is a prime power, then drag B is:

B=(a/b) Acos θ------(formula 1)

Because of a＞b, know by formula 1, with a less pulling force A, can get a bigger drag (B), thereby produce times power effect.

But this big drag B, in existing brake of commonly using, still sense is not enough, especially the teenager go to school or during outing all by bike, often very dangerous because of the brake weight quantity not sufficient.

Main purpose of the present utility model, tying up to provides a kind of multiple lever brake gear, times power that the special space structure of the multiple lever of mat is produced, labour-saving effect when reaching brake.

The multiple lever brake gear of a kind of bicycle of the present utility model comprises two symmetrical brake bodies, relatively respectively sets firmly a brake lining at this two brakes body corresponding to the bicycle rim place, establishes one between two brake bodies and can make it the bullet that outside bullet opens and open assembly; It is characterized in that: the described body that respectively brakes is formed by one first lever, one second lever, a connecting rod, a fixed arm.The affixed brake cable of described first lever, one end, the other end is established a fulcrum, and an end of its central desired location and connecting rod is articulated; The other end of described second lever, one end and described connecting rod is articulated, and the other end is also established a fulcrum, the affixed described brake lining in central desired location; The fulcrum of the fulcrum of described first lever and second lever all is articulated on the described fixed arm, and this fixed arm is fixed in the desired location of bicycle wheel fork.

Now lifting a preferred embodiment and conjunction with figs. is described further.

The three-dimensional exploded view of brake is commonly used by Fig. 1 system.

The single lever cutaway view of brake is commonly used by Fig. 2 system.

Fig. 3 is a three-dimensional exploded view of practising the utility model one preferred embodiment.

Fig. 4 is the multiple lever cutaway view of the utility model one preferred embodiment.

A kind of multiple lever brake gear of the present utility model, two shapes are to being referred to as the body 7,8 that brakes about mainly comprising, see also shown in Figure 3, this brake body 7 is opened assembly 40 by first lever 60 and second lever 70, a fixed arm 20, a connecting rod 30, a bullet and is formed, and also is provided with a bullet on the brake body 7 and opens assembly 40.

Wherein first lever 60 is as the font in January, and two ends and centre respectively wear a

perforation

61,62 and 63; Second lever 70 as the ㄑ font, two ends and centre also respectively wear a

perforation

71,72 and 73.

A fixed arm 20 as a Y font plate body, mat two

screws

94,95 are solidly plugged in 93 li of the draw-in grooves in bicycle wheel fork desired location, and this desired location, fixed arm 20 two ends respectively wears a perforation 21,22.Be articulated connecting rod 30 of the fulcrum 62 of first lever 60 and the fulcrum 72 of second lever 70 is the in-line plate body, and its two ends respectively wear a

perforation

31,32, articulates with the

perforation

63,71 of two

levers

60,70.

Bullet is opened assembly 40, is to be made up of an elastic element 43 and two

cylinders

41,42, and wherein first cylinder, 41 1 ends are body 44, and the other end of cylinder 41 is established a perforation 411, with perforation first lever 60 and the affixed end of brake cable 61 pivot joints of side brake body 7; Second cylinder, 42 1 ends penetrate in the body 44 of first cylinder, and its other end is established a perforation 421, with an end perforation 602 pivot joints affixed with the brake body of opposite side brake body 8 first levers 601; Elastic element 42 is located on second cylinder 42, and because of being subjected to the effect of elastic element 43, second cylinder can be free to slide in the body 44 of first cylinder 41.

See also shown in Figure 4, the fulcrum 101 of first lever 60 is to articulate what fixed arm 20 1 perforations 21 by perforation 62 to be formed, when brake cable 80 tensions, the point of application 102 of first lever 60 produces a pulling force B, it is that the rotating shaft inhour is rotated with fulcrum 101 that this pulling force B makes the force arm b of first lever 60, and the drag arm a that causes first lever 60 also produces an inhour and rotates; The inhour of drag arm a generation is rotated, and by the point of application 103 of first lever 60, transmits this rotation with connecting rod 30, and the point of application 104 that causes at second lever 70 produces a thrust A; It is that the rotating shaft inhour is rotated with fulcrum 105 that thrust A makes the force arm e of second lever 70, and the drag arm d that causes second lever 70 also produces an inhour and rotates; The inhour of this drag arm d generation is rotated, and comes ratch circle 91 by 106 affixed Linings 52 of second lever, 70 resistance points, and promptly wheel rim 91 is bestowed resistance points 106 1 drag D, reaches statical equilibrium and produces powerful braking effect.

First lever 60 and second lever 70 support what fulcrum 101 and fulcrum 105, the second levers 70 1 ends to be connected with the resistance points 103 of the connecting rod 30 and first lever 60 respectively, and the force balance that forms a multiple lever is as back (seeing also shown in Figure 4):

ebBcosθ＝adD

That is D=(eb/ad) Bcos θ

This again major advantage of lever braking device be: because of the very big what of e and b wherein A and d, namely the value of times power factor cb/ad is very big, can enlarge markedly multiplying power; If only be single lever, then a times power factor is b/a; Now relatively answer lever and single thick stick The twice power factor of bar, because of the e＞d of multiple lever, described (eb/ad)＞(b/a), So multiple lever braking device can make the user when brake, executes a littler strength, Can provide lining 52 1 bigger brake force, more reliable and secure when making brake. This is the major advantage of this multiple lever braking device.

Claims

1. the multiple lever brake gear of a bicycle comprises two symmetrical brake bodies, relatively respectively sets firmly a brake lining at this two brakes body corresponding to the bicycle rim place, establishes one between two brake bodies and can make it the bullet that outside bullet opens and open assembly; It is characterized in that:

The described body that respectively brakes is formed by one first lever, one second lever, a connecting rod, a fixed arm.

The affixed brake cable of described first lever, one end, the other end is established a fulcrum, and an end of its central desired location and connecting rod is articulated; The other end of described second lever, one end and described connecting rod is articulated, and the other end is also established a fulcrum, the affixed described brake lining in central desired location;

The fulcrum of the fulcrum of described first lever and second lever all is articulated on the described fixed arm, and this fixed arm is fixed in the desired location of bicycle wheel fork.

2. the multiple lever brake gear of bicycle according to claim 1 is characterized in that described bullet opens assembly and be made up of an elastic element and two cylinders;

Wherein first cylinder, one end is a body, the stomidium pivot joint affixed with brake cable of first lever of the other end and side brake body; Second cylinder, one end penetrates in the body of first cylinder, being articulated with the affixed end of brake cable of first lever of the other end and another brake body; Be provided with described elastic element on described second cylinder, the cylinder of second cylinder can slide in the body of first cylinder under its effect.

3. the multiple lever brake gear of bicycle according to claim 1, it is characterized in that described fixed arm is a Y shape plate body, these plate body mat two screws are solidly plugged in the draw-in groove in bicycle wheel fork desired location, the fulcrum of the fulcrum of described first lever and second lever respectively with its on two perforations be articulated.