CN2837194Y - Pedal crank - Google Patents

Abstract

The utility model relates to a foot pedaling crank, which can be used for bicycles, etc. The foot pedaling crank is characterized in that force which is equivalent to a normal travel condition is only needed to use when the bicycle is ridden to travel, the bicycle can be adapted to conditions of upslope, headwind, etc. The foot pedaling crank has simple structure that one end of a rod A is movably connected with one end of a rod B by a pin shaft, and an eccentric surface is arranged on a discretional end. A push rod, a spring, and a screw-thread adjusting seat are orderly arranged in a position corresponding to the eccentric surface of the other rod end in a shaft direction on the rod which is not provided with the eccentric surface. The rod B and the rod A can do relative reciprocating movements within a turning corner n. When a change occurs to the rod B by stressing, a crank force moment can also be changed along with the rod B to adapt for various condition changes. A left crank and a right crank work alternately, and thus, a purpose is realized.

Description

A kind of foot-operated crank

Technical field

The utility model relates to a kind of bicycle crank.

Background technology

At present, foot-operated crank generally is used for bicycle, and bicycle, three-wheel vehicle etc. are arranged, and is one of widely used important vehicle.But use these bicycles running into upward slope, when waiting condition against the wind, can make the people feel to require great effort very much.And the bicycle of some boosted vehicles or variable-ratio needs consumes energy or speed slower, and structure is comparatively complicated.

Summary of the invention

The foot-operated crank that the utility model provides only needs to go up a slope with the cooresponding power of cruising condition bicycle being adapted to, wait condition against the wind when travelling by bike, and simple in structure.

The utility model is achieved in that A bar one end is connected with an end bearing pin of B bar is alive, and there is eccentric face can be located at the end of A bar or B bar arbitrarily at circumferencial direction, and correspondence has limit dais or groove respectively, two bars can be done relatively reciprocating motion in corner n, do not establish in the end on the bar of eccentric face and axially with the cooresponding position of the eccentric face of another rod end tappet is housed, tappet one end withstands on the eccentric face other end and is adorning spring and threaded adjustment seat in proper order; The other end of A bar has axis hole and is parallel to bearing pin, but its inboard axis hole position fixed chain wheels in case of necessity, and its outside of the other end of B bar is connected and is parallel to bearing pin with pedal shaft.

The utility model can make when changing crank moment also change in that the B bar is stressed thereupon, adapting to the variation of various conditions, and left and right sides crank alternation, thus realized above-mentioned purpose.

Description of drawings

Fig. 1 and Fig. 2 are the basic structure of the utility model embodiment.

Among the figure: the 1.A bar; 2.B bar; 3. bearing pin; 4. axis hole; 5. positioning table or groove; 6. eccentric face; 7. tappet; 8. spring; 9. threaded adjustment is sat; 10. pedal shaft.

The specific embodiment

Fig. 1 is identical with basic structure among Fig. 2 embodiment.A bar 1 one ends are lived with an end bearing pin 3 of B bar 2 and are connected.The circumferencial direction that two bars are lived connecting portions at bearing pin 3 has eccentric face 6 can be located at the end of A bar or B bar 2 arbitrarily, and correspondence is provided with limit dais or groove 5 can do relatively reciprocating motion B bar 2 and A bar 1 in corner n respectively; Corner n is as shown in the figure: the axis of B bar 2 with the axis of A bar 1 be stop upwards (the stressed side of pedal) can be located between 60 °-75 ° or 45 °-90 °.The other end of A bar 1 has axis hole 4 and parallel with bearing pin 3, but at the whole inboard axis hole of crank 4 positions fixed chain wheels in case of necessity.The other end of B bar 2 is in the crank single-piece outside and pedal shaft 10 connections and parallel with bearing pin 3.Installing condition: B bar 2 is an angle to stressed side of pedal and A bar.

Can adopt disk spring or spiral compression spring in the embodiment in figure 1: axially adorning by drum location and can axially movable tappet 7 with the eccentric face of A boom end 6 cooresponding positions on the B bar, an end of tappet 7 withstands on the eccentric face in the other end drum order and is adorning spring 8 and threaded adjustment seat 9 (outside threads).Fig. 2 embodiment is a kind of form that adopts spiral compression spring: tappet 7, spring 8 and threaded adjustment seat 9 (negative threads) order can be sleeved on the end and not establish on the B bar of eccentric face 6.

In the above-described embodiments, sit 9 by threaded adjustment and can adjust the precompressed compression of 8 pairs of tappets 7 of spring to adapt to force request.

Claims (3)

1. foot-operated crank, comprise sprocket wheel and pedal, it is characterized in that: A bar (1) one end is lived with an end bearing pin (3) of B bar (2) and is connected, and there is eccentric face (6) can be located at the end of A bar (1) or B bar (2) arbitrarily at circumferencial direction, and correspondence has limit dais or groove (5) respectively, two bars can be done relatively reciprocating motion in corner n, do not establish in the end on the bar of eccentric face and axially with the cooresponding position of the eccentric face (6) of another rod end tappet (7) is housed, tappet (7) one ends withstand on eccentric face (6) and go up the other end and adorning spring (8) and threaded adjustment seat (9) in proper order; The other end of A bar (1) has axis hole (4) and is parallel to bearing pin (3), in case of necessity its inboard axis hole (4) but the position fixed chain wheels, the other end of B bar (2) its outside be connected and be parallel to bearing pin (3) with pedal shaft (10).

2. according to the described foot-operated crank of claim 1, the axis that it is characterized in that corner n:B bar (2) is that stop can be located between 60 °-75 ° or 45 °-90 ° to the stressed side of pedal with the axis of A bar (1).

3. according to the described foot-operated crank of claim 1, it is characterized in that: spring (8) is disk spring or spiral compression spring.

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