CN2254343Y

CN2254343Y - Gear capable of driving forward and backward

Info

Publication number: CN2254343Y
Application number: CN 95228044
Authority: CN
Inventors: 卜庆国
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-29
Filing date: 1995-11-29
Publication date: 1997-05-21
Anticipated expiration: 2005-11-29

Abstract

The utility model relates to a gear capable of driving forward and backward, comprising a wheel 4. The utility model is characterized in that a square tooth ratchet wheel 3 in the gear is coaxially connected with a handle 1, and the handle 1 is hinged with a ratchet pawl 2; the swing end of the ratchet pawl 2 is contacted with the outer circle of the ratchet wheel 3, and the ratchet wheel 3 is connected with a wheel 4. The utility model has simple structure and reliable motion, and is suitable for various man-power machines which comprise the wheelchair and need to be driven from both positive and opposite sides.

Description

Can before and after drive the mechanism of wheelchair

This utility model belongs to a kind of man power driving mechanism.

The wheelchair that the people with disability uses roughly has following several type of drive: 1. rotate two trailing wheels respectively with two handss, though this car can before and after walking freely, travel speed is slow, efficient is low; 2. with handle--link chain mechanism drives front-wheel or trailing wheel, and the shortcoming of this class car is can not be to rear drive.

This utility model be to introduce a kind of can before and after drive the mechanism of wheelchair.

The operation principle of this mechanism is: a square tooth ratchet mechanism is connected on the driving wheel of wheelchair, utilizes conversion ratchet operative orientation, positive and negative two directions of driving pawl are rotated, thereby realize the purpose that wheelchair advances, retreats.

The advantage of this mechanism is, simple in structure, reliable operation, itself and chain-drive mechanism or gear mechanism is used, and also can change rotating speed, driving force, increases work efficiency.

Enumerate several embodiment below.

Embodiment 1 is as Fig. 1.Handle (1) ratchet (2), square tooth ratchet (3), wheel (4) are coaxial, and ratchet (3) is fixed on the wheel (4), and ratchet (2) is hinged on the handle (1), and its swinging end contacts with the cylindrical of ratchet (3).Press shown in the figure, ratchet (2) rotates counterclockwise or reciprocally swinging handle (1) in the left side of handle (1), can drive wheel (4) and rotate counterclockwise or surmount rotation; Upset ratchet (2) is to handle (1) right side, can drive wheel (4) and clockwise rotate or surmount rotation.

Embodiment 2 is as Fig. 2.Here handle (1), ratchet (3), sprocket wheel (6) are coaxial, and sprocket wheel (6) is fixing with ratchet (3).Sprocket wheel (7) is coaxial and interfix with wheel (4).Connect with chain (5) between two sprocket wheels.Ratchet (2) is " people " font.When its right side contacts with ratchet (3), clockwise rotate handle (1), can drive wheel (4) and clockwise rotate; On the contrary, when the left side of ratchet (2) contacts with ratchet (3), handle (1) can drive wheel (4) and rotate counterclockwise.Two sprocket wheels and chain can use sheave, belt to replace respectively.During conditions permit, also available gear replaces sprocket wheel.

Embodiment 3 is as Fig. 3.Transverse feed mechanism in the present embodiment on the similar shaping machine of the working method of ratchet, ratchet.Direction when upset ratchet (2) can change turning to of ratchet (3).

The ratchet thread form that uses among above-mentioned three embodiment is quadrate, but also can use circular arc or triangle under specific circumstances.Embodiment 4 has introduced a kind of with the using method of Sleeve Roller Chain Wheel as ratchet as Fig. 4, as long as make being of convenient length of ratchet, just can guarantee mechanism's operate as normal.

Fig. 1 is and the co-axial ratchet driving mechanism of wheel.

" people " font ratchet driving mechanism that Fig. 2 connects with wheel with chain.

Fig. 3 and wheel are co-axial to be faced directly---inclined-plane ratchet driving mechanism.

The co-axial arc surface ratchet of Fig. 4 and wheel driving mechanism.

Claims

Can before and after drive the mechanism of wheelchair, comprise wheel (4), it is characterized in that: square tooth ratchet (3) in the mechanism and coaxial connection of handle (1), handle (1) is gone up articulated ratchet (2), the swinging end of ratchet (2) contacts with ratchet (3) excircle, and ratchet (3) connects with wheel (4).
By claim 1 can before and after drive the mechanism of wheelchair, it is characterized in that: ratchet (3) connects for coaxial interfixing with wheel (4).
By claim 1 can before and after drive the mechanism of wheelchair, it is characterized in that: is connected by sprocket wheel (6), (7) and chain (5) between ratchet (3) and the wheel (4), sprocket wheel (6) is fixed with ratchet (3) is coaxial, and sprocket wheel (7) is fixed with wheel (4) is coaxial.
By claim 1 can before and after drive the mechanism of wheelchair, it is characterized in that: the square tooth ratchet in the mechanism replaces with circular arc thread form or triangular tooth-shaped ratchet.