CN2253714Y

CN2253714Y - Lever-driving speed-changing bicycle

Info

Publication number: CN2253714Y
Application number: CN95246520U
Authority: CN
Inventors: 曹伟忠
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-27
Filing date: 1995-11-27
Publication date: 1997-05-07
Anticipated expiration: 2005-11-27

Abstract

The utility model relates to a lever type driving bicycle with variable speed; the utility model mainly solves problems that the application of a bicycle is laborious, and the structure of the speed variation unit of the bicycle is complicated. The utility model is characterized in that a variable shaft bracket is fixed on a bicycle body, a variable shaft is arranged in the variable shaft bracket, two levers which are used as power levers are arranged on the variable shaft, and the front ends of the power levers are provided with foot boards; a lever for the seat of the foot board is arranged between the two foot boards, zonal toothed racks are connected with the rear ends of the power levers, the zonal toothed racks pass through unidirectional power transmission gears and are connected with rotary springs, and the zonal toothed racks are mutually engaged with the unidirectional power transmission gears; the power transmission gears are fixed with a middle gear and a rear axletree, and the middle gear is engaged with the unidirectional gear of the rear axletree.

Description

A kind of lever drives variable speed bicycle

The utility model relates to a kind of lever and drives variable speed bicycle.

In prior art, the propulsive effort that bicycle driving mainly relies on the revolution of tread plate Knucle-gear to produce, send the unidirectional power transmission gear that is fixed together with trailing wheel to by chain, thereby the drive trailing wheel is realized, its weak point is the variation along with the driven wheel degreeof turn, particularly when two tread plates are presented position about next line, use relatively effort, simultaneously, because the length of tread plate Knucle-gear drive spindle is shorter, so existing propulsive effort is greatly enhanced, in addition, existing derailleur adopts the conversion of big miniature gears than speed, and this transmission system is complex structure not only, and chain comes off easily.

The purpose of this utility model provides a kind of simple in structure, easy to use and labour-saving lever driving variable speed bicycle.

The utility model is by front vehicle wheel, rear wheel and vehicle body are formed, it is characterized in that: on vehicle body, be fixed with a speed change pedestal, one variable shaft is arranged in the speed change pedestal, variable shaft can move in the speed change pedestal, two lever power bars are arranged on the variable shaft of bicycle two sides, front end at two lever power bars respectively has a tread plate, one flexible pedestal seat bar is arranged between two tread plates, the pedestal seat bar is through on the vehicle body, respectively be connected with a banded tooth bar in the rear end of two lever power bars, two banded tooth bars link to each other with the two-revolution spring by behind the two unidirectional power transmission gears, and banded tooth bar and unidirectional power transmission gear coincide mutually, and unidirectional power transmission gear is fixed on the rear vehicle shaft.

Because the utility model adopts the up-and-down movement of lever power bar to drive bicycle, so its acting force arm is long, again owing to become the circumgyration campaign into being similar to straight-line motion up and down, this becomes reasonable more and convenient with regard to making the application force that applies, easy to use and laborsaving, simultaneously, variable shaft can move in the speed change pedestal, the arm of force of two lever power bar fulcrum both sides is changed, and thus, the up-and-down movement scope and the speed of tooth bar also correspondingly change, this just makes the speed of bicycle also ensue variation, reach the purpose of speed change, its structure is very simple, uses also very convenient.

Below in conjunction with accompanying drawing the utility model is elaborated,

Fig. 1 is a structural representation of the present utility model,

Fig. 2 is the structural representation of another embodiment of the utility model,

With reference to Fig. 1, on vehicle body 16, be fixed with a speed change pedestal 5, one variable shaft 6 is arranged in the speed change pedestal, variable shaft can move in the speed change pedestal, it is the fulcrum of power, it is again the point of adjustment of velocity variations, variable speed operation bar 14 links to each other with variable shaft by speed change steel wire 15 backs, be used for variable shaft is done the operation move forward and backward, two

lever power bars

1 and 4 are arranged on the variable shaft of bicycle two sides, front end at two lever power bars respectively has a tread plate 3, one flexible pedestal seat bar 2 is arranged between two tread plates, the pedestal seat bar is through on the vehicle body, it can place restrictions on the lower position of tread plate motion, also can play the rest effect to tread plate, respectively be connected with a

banded tooth bar

9 and 11 in the rear end of two lever power bars, two banded tooth bars link to each other with 12 with two-revolution spring 10 by two unidirectional power transmission gears, 7 backs, under the effect of main spring, two banded tooth bars are in by the state toward rear haulage, banded tooth bar and unidirectional power transmission gear coincide mutually, and the power transmission gear is fixed on the rear vehicle shaft, drives banded tooth bar when two lever power bar up-and-down movements, banded tooth bar moves thereby bicycle is produced by unidirectional power transmission gear driven rear vehicle shaft drive rear wheels.

With reference to Fig. 2, two

lever power bars

1 and 4 are on the variable shaft of bicycle homonymy, wherein a lever power bar is " Z " font, front end is at the opposite side of frame, front end at two lever power bars respectively has a tread plate 3, one flexible pedestal seat bar 2 is arranged between two tread plates, the pedestal seat bar is through on the vehicle body, respectively be connected with a

banded tooth bar

9 and 11 in the rear end of two lever power bars, two banded tooth bars link to each other with 12 with two-revolution spring 10 by two unidirectional power transmission gears, 7 backs, banded tooth bar and unidirectional power transmission gear coincide mutually, the power transmission gear is fixed on the intermediate gear 8, intermediate gear and rear vehicle shaft fix, intermediate gear and rear vehicle shaft ratchet 13 match, and drive banded tooth bar when two lever power bar up-and-down movements, and banded tooth bar is by unidirectional power transmission gear driven intermediate gear, intermediate gear coupling rear vehicle shaft ratchet rear drive rear wheel, thus make bicycle produce motion.

Claims

1, a kind of lever drives variable speed bicycle, comprise front vehicle wheel, rear wheel and vehicle body, it is characterized in that: on vehicle body, be fixed with a speed change pedestal, one variable shaft is arranged in the speed change pedestal, variable shaft can move in the speed change pedestal, two lever power bars are arranged on the variable shaft of bicycle two sides, front end at two lever power bars respectively has a tread plate, one flexible pedestal seat bar is arranged between two tread plates, the pedestal seat bar is through on the vehicle body, respectively be connected with a banded tooth bar in the rear end of two lever power bars, two banded tooth bars link to each other with the two-revolution spring by behind the two unidirectional power transmission gears, banded tooth bar and unidirectional power transmission gear coincide mutually, and unidirectional power transmission gear is fixed on the rear vehicle shaft.

2, a kind of lever according to claim 1 drives variable speed bicycle, and it is characterized in that: two lever power bars are on the variable shaft of bicycle homonymy, and wherein a lever power bar is " Z " font, and front end is at the opposite side of frame.

3, a kind of lever according to claim 1 and 2 drives variable speed bicycle, and it is characterized in that: unidirectional power transmission gear is fixed on the intermediate gear, and intermediate gear and rear vehicle shaft fix, and intermediate gear and rear vehicle shaft ratchet match.