CN202699454U

CN202699454U - Chassis with buffer arm

Info

Publication number: CN202699454U
Application number: CN 201220433147
Authority: CN
Inventors: 胡达广
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-29
Filing date: 2012-08-29
Publication date: 2013-01-30
Anticipated expiration: 2022-08-29

Abstract

The utility model discloses a chassis with a buffer arm, which belongs to the same technical field as electric wheelchairs. In the prior art, when an electric wheelchair walks downstairs, the ratio of the descending vertical amplitude of each wheel to the rotation angle of each wheel is increased rapidly in non-linear way and even falls vertically along with the rotation of the wheels at the back half section of a process of walking downstairs, so that strong impact and shock are generated on the electric wheelchair. Specific to the aims of reducing impact and shock of the wheels of the electric wheelchair while walking downstairs and improving the comfort and safety, the adopted technical scheme is that: the following structure is adopted for relieving impact: the buffer arm is hinged on a vehicle frame or an axle; one end of a damper is hinged on the buffer arm; and the other end of the buffer arm is hinged on a seat or the vehicle frame.

Description

Chassis with buffer arm

Technical field

The invention belongs to a technical field of electric wheelchair.

Background technology

In the prior art of electric wheelchair, a kind of electric wheelchair of climbed step of four-wheel drive is arranged.This electric wheelchair has certain superiority with respect to the electric wheelchair of the climbed step of other form, simple in structure such as it, draw materials easy and easy to operate etc.This electric wheelchair is owing to climbing the needs of step, and its front-wheel and trailing wheel must will be selected equal and the larger wheel of diameter.But be subjected to the wheel that limits it of volume and motility can not be infinitely great.In fact the radius of the wheel of this electric wheelchair of the prior art is just slightly high than the height of step, that is to say that its axle center of wheel is slightly higher than the height of step.This electric wheelchair wheel of getting out of a predicament or an embarrassing situation walks to step level when point, and wheel begins to descend round the rotation of level point.(summit of wheel also is that to be equivalent to 0 of clock be zero degree to the intersection point of perpendicular diameter and wheel circumference behind 225 degree of intersection point at wheel of step level point and wheel circumference, radius rotates to the angle of the intersection point of level point and circumference clockwise, as shown in Figure 2 10), the unit field amplitude that wheel descends and the ratio of the unit rotational angle of wheel are along with the rotation of wheel non-linearly increases sharply.When the intersection point of step level point and wheel circumference near the 275(of wheel as shown in Figure 2 9) degree, during also namely through the horizontal line in the center of circle, the rate of descent of wheel is more near out of control, even the feelings degree of vertical line decline.This class electric wheelchair generally all is equipped with chair appearance adjusting device, and its effect is can keep the constant of its seat attitude when electric wheelchair is topped bar or got out of a predicament or an embarrassing situation.When electric wheelchair was got out of a predicament or an embarrassing situation, its seat rotated backward under the effect of chair appearance adjusting device, made the center of gravity of user and electric wheelchair to the rear semicircle transfer of front-wheel, made above-mentioned situation make the matter worse.The result of above-mentioned these factors makes electric wheelchair must produce strong impact to the next stage step surface when getting out of a predicament or an embarrassing situation, and therefore electric wheelchair self has also produced strong vibrations.Yet this situation but can not by eliminating to the control of throttle or to the technological means such as braking of wheel, that is to say that this defective is the inevitable outcome of this structure.This situation has had a strong impact on comfortableness and the safety of this electric wheelchair.

Summary of the invention

The impact and the vibrations that produce when getting out of a predicament or an embarrassing situation for the wheel that alleviates electric wheelchair improve comfortableness and safety this programme and have taked the mode of reload buffer arm on electric wheelchair to alleviate the degree of impacting and shaking.Buffer arm is hinged on vehicle frame or the axletree, and an end of amortisseur is hinged on the buffer arm, and the other end of amortisseur is hinged on seat or the vehicle frame.

The benefit of such structure is in the process that electric wheelchair is got out of a predicament or an embarrassing situation, when the intersection point of step level point and wheel circumference runs to the position at 225 degree angles of wheel, jockey pulley just touches step surface (as shown in Figure 3), most of potential energy that amortisseur produces when absorbing electric wheelchair and user decline by buffer arm, jockey pulley, the speed that its is descended significantly slows down.Thereby significantly alleviate the vibrations of this moment, the comfortableness and the safety that have improved electric wheelchair.

Description of drawings

Fig. 1, use the electric wheelchair with the buffer arm chassis, the hinged side view on the seat of an end of amortisseur.

Electric wheelchair under Fig. 2, the prior art schematic diagram of getting out of a predicament or an embarrassing situation.

Fig. 3, use with the electric wheelchair on the buffer arm chassis schematic diagram of getting out of a predicament or an embarrassing situation.

Fig. 4, use the electric wheelchair with the buffer arm chassis, an end of amortisseur is hinged on the schematic diagram on the vehicle frame.

Among the figure: seat 1, chair appearance adjusting device 2, trailing wheel 3, vehicle frame 4, amortisseur 5, buffer arm 6, jockey pulley 7,180 degree lines 8,275 degree lines 9,225 degree linea angulatas 10, front-wheel 11.

The specific embodiment

We can clearly be seen that the wheel when electric wheelchair walks to step level point from Fig. 2, begin to be rotated down around the level point, behind 225 degree of intersection point at wheel of step level point and wheel circumference, the unit field amplitude that wheel descends and the ratio of the unit rotational angle of wheel are along with the rotation of wheel non-linearly increases sharply.When the intersection point of step level point and wheel circumference near 275 degree of wheel during also namely through the horizontal line in the center of circle, the rate of descent of wheel is more near feelings degree out of control.Such electric wheelchair certainly leads to strong impact and vibrations when getting out of a predicament or an embarrassing situation.

The front-wheel that this programme can be used in electric wheelchair also can be used in the trailing wheel of electric wheelchair, and this programme also is fit to all wheel-mounted all kinds of wheelchairs simultaneously.The present invention mainly is made of front-wheel 11, trailing wheel 3, vehicle frame 4, buffer arm 6, amortisseur 5, seat 1 etc.In order to slow down above-mentioned impact and vibrations, this programme is installed buffer arm 6 at the vehicle frame 4 of electric wheelchair or the axletree of wheel, and buffer arm 6 can be hinged on vehicle frame 4 or the axletree, and the effect of this dual mode gained is the same.Mounting shock absorber 5 as shown in Figure 1 and Figure 4 between buffer arm 6 and seat 1 or buffer arm 6 and vehicle frame 4.One end of amortisseur 5 is contained in vehicle frame 4 or is contained on the seat 1 mainly is for a fulcrum is provided to amortisseur, and these two kinds of mounting means are the same from the effect of damping.But when the present invention is used on the electric wheelchair that chair appearance adjusting device 2 is housed, one end of amortisseur 5 is hinged on the seat 1, the height of adjusted in concert buffer arm 6 and jockey pulley in the time of can utilizing chair appearance adjusting device 2 to regulate the chair appearance (buffer arm 6 be equipped with an end of jockey pulley 7 and the height between ground or the step surface) makes buffer arm 6 have different height better to adapt to different needs when electric wheelchair is topped bar or got out of a predicament or an embarrassing situation.Be noted that in addition the jockey pulley 7 of installing on the buffer arm 6 just for the friction that reduces buffer arm 6 and step surface fills, the problem that it and this programme will solve is irrelevant, that is to say whether the installation of jockey pulley 7 can not affect damping effect to some extent.

Its work process is: get out of a predicament or an embarrassing situation to moving ahead when electric wheelchair, when the level point of the circumference of its front-wheel and step intersected, wheel began to descend as shown in Figure 3 round the rotation of level point.When the intersection point of level point and wheel circumference drops on the position of 225 degree of wheel, jockey pulley 7 on the buffer arm 6 just contacts with step surface, at this moment amortisseur 5 begins to bear the part weight of electric wheelchair and user and absorb the potential energy that produces when its part descends by buffer arm 6, jockey pulley 7, the decrease speed of electric wheelchair is slowed down, and the impact that therefore it produce and vibrations are also retarded.

Claims

1. chassis with buffer arm, mainly comprise front-wheel (11), trailing wheel (3), vehicle frame (4), buffer arm (6), amortisseur (5), seat (1), it is characterized in that, buffer arm (6) is hinged on vehicle frame (4) or the axletree, one end of amortisseur (5) is hinged on the buffer arm, and the other end of amortisseur (5) is hinged on seat (1) or the vehicle frame (4).