CN202960975U

CN202960975U - Speed-variable wheelchair

Info

Publication number: CN202960975U
Application number: CN 201220624180
Authority: CN
Inventors: 董志
Original assignee: Suzhou Vocational University
Current assignee: Suzhou Vocational University
Priority date: 2012-11-23
Filing date: 2012-11-23
Publication date: 2013-06-05
Anticipated expiration: 2022-11-23

Abstract

The utility model provides a speed-variable wheelchair which comprises a chair rack provided with a backrest and a seat cushion, a left hand wheel, a right hand wheel, a braking mechanism and a universal wheel, wherein the left and right hand wheels are matched with the main shaft of the chair rack by virtue of bearings; the universal wheel is positioned below a pedal, wherein the main shaft is fixed below the chair rack by virtue of a bracket; the middle position of the main shaft below the chair rack is provided with a plurality of gears; two sides of the plurality of gears on the main shaft are connected with auxiliary rear wheels by virtue of support bars; the chair rack is further provided with a gear change mechanism; and the gear change mechanism is positioned on the upper side of the main shaft and is linked with the main shaft in a gear transmission mode. By virtue of the mode, the speed-variable wheelchair is provided; by virtue of aiming at the particularity of users and special situations in use, a transmission mode based on gear sets with different transmission ratios is adopted for achieving the mechanical transmission speed change, and the capability of the users of passing by a special road section is enhanced; and meanwhile, by virtue of a draw rod designed, the user can drive the wheelchair by more than just the hand wheels, and the practicability of the wheelchair is greatly improved.

Description

A kind of variable-ratio wheelchair

Technical field

This utility model relates to the mechanical process field, particularly relates to a kind of variable-ratio wheelchair.

Background technology

Wheelchair is the important tool of healthy rehabilitation, is also cripple's main walking-replacing tool.Now, wheelchair makes health exist the part population of obstacle freely to walk with the ability of oneself, is subject to vast favorable comment.Common wheelchair mainly comprises chair frame, chair wheel, brake etc., is not fully straight due to real road in the routine use process, has the highway section of the high gradient for some, and this class crowd covers needs cost to have more several times of even effort of tens times than ordinary person.And when they ran into emergency, travel speed was too low, one barrier that has become them to raise the efficiency.

Summary of the invention

The technical problem that this utility model mainly solves is to provide a kind of variable-ratio wheelchair, and it is reasonable in design, and is simple in structure, has taked two kinds of processing modes for special road section and ordinary road, by laborsaving and in good time adjustment pick up speed, has solved this class problem.

For solving the problems of the technologies described above, the technical scheme that this utility model adopts is to provide a kind of variable-ratio wheelchair and comprises: can install backrest and medicated cushion chair frame, rely on the universal wheel below left and right handwheel, arrestment mechanism and the pedal that bearing coordinates with the chair frame main shaft; Described main shaft is fixed on below described chair frame by support; Two gears are equipped with in the centre position of described main shaft; The both sides of the above some gear of main shaft are connecting the power-assist trailing wheel by support bar; Gear also is equipped with in described chair frame below; Described gear is positioned at the upside of described main shaft, and by gear transmission mode and the interlock of described main shaft.

Preferably, described gear comprises: rotating shaft, change-speed gearing, gear lever and pull bar; Described rotating shaft is parallel with described main shaft, two change-speed gearings at rotating shaft middle part can with described main shaft on meshed transmission gear; Described rotating shaft one end is fixed with described gear lever, and the other end is connecting described pull bar.

Preferably, described pull bar is connected with described rotating shaft by single direction ratchet, and retracting spring is equipped with in the junction; The arc-shaped rack of described pull bar bottom and the engagement of the gear on described single direction ratchet axle.

The beneficial effects of the utility model are: a kind of variable-ratio wheelchair is provided, for the particularity that uses the crowd with the special circumstances when using, the gear train kind of drive of employing different drive ratios reaches the purpose of machine driving speed change, allows user get a promotion by the ability of special road section.Simultaneously, the pull bar of design can allow the user be not only the armrest center wheel drive power wheelchair, has improved greatly the practicality of wheelchair.

Description of drawings

Fig. 1 is the right TV structure schematic diagram of a kind of variable-ratio wheelchair of this utility model;

Fig. 2 is the main TV structure schematic diagram of a kind of variable-ratio wheelchair of this utility model;

Fig. 3 is the backsight structural representation of a kind of variable-ratio wheelchair of this utility model;

Fig. 4 is the local enlarged diagram of pull bar and single direction ratchet cooperation place;

In accompanying drawing, the labelling of each parts is as follows: 1, chair frame; 2, gear; 3, arrestment mechanism; 4, universal wheel; 5, rear auxiliary driving wheel; 6, support bar; 7, main shaft; 8, gear I; 9, gear II; 10, bearing; 11, hands wheel; 12, handrail; 13, support; 21, rotating shaft; 22, gear lever; 23, pull bar; 24, change-speed gearing I; 25, change-speed gearing II; 26, single direction ratchet; 27, arc-shaped rack; 28, retracting spring.

The specific embodiment

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that, protection domain of the present utility model is made more explicit defining.

See also accompanying drawing 1 to 4, this utility model embodiment comprises:

A kind of variable-ratio wheelchair comprises: can install backrest and medicated cushion chair frame 1, rely on the universal wheel 4 below left and right handwheel 11, arrestment mechanism 3 and the pedal that bearing 10 coordinates with main shaft 7 on chair frame 1; Described main shaft 7 is fixed on the below of described chair frame 1 by support 13; Two gears are equipped with in the centre position of described main shaft 7; The both sides of main shaft 7 the above two gear are connecting power-assist trailing wheel 5 by support bar 6; Gear 2 also is equipped with in described chair frame 1 below; Described gear 2 is positioned at the upside of described main shaft 7, and by gear transmission mode and 7 interlocks of described main shaft.Described gear 2 comprises: rotating shaft 21, change-speed gearing, gear lever 22 and pull bar 23; Described rotating shaft 21 is parallel with described main shaft 7, two change-speed gearings at rotating shaft 21 middle parts can with described main shaft 7 on meshed transmission gear; Described rotating shaft 21 1 ends are fixed with described gear lever 22, and the other end is connecting described pull bar 23.Described pull bar 23 is connected with described rotating shaft 21 by single direction ratchet 26, and retracting spring 28 is equipped with in the junction; The arc-shaped rack 27 of described pull bar 23 bottoms and the gear engagement on described single direction ratchet 26 axles.Described gear 2 is realized speed change by the gear engagement states with different drive ratios.

Working method in conjunction with an a kind of variable-ratio wheelchair of preferred embodiments explanation this utility model:

When accelerate gently in the highway section: gear lever 22 is transferred to the outer end, the gear II 9 in rotating

shaft

21 and 25 engagements of the change-speed gearing II on main shaft 7.At this moment, pull back by pull bar 23, make the arc-shaped rack 27 of its bottom drive rotating shaft 21 rotations.Gear II 9 drives change-speed gearing II 25, and wheelchair is rolled forward.And when pull bar 23 swings backward because of retracting spring 28, due to single direction ratchet 26 being housed in rotating shaft 21, the resistance that chair can not be advanced.The highway section is on the rise: gear lever 22 is advanced to the inside, make gear I 8 and 24 engagements of change-speed gearing I.Order about in an identical manner wheel chair sport, due to the change of gear ratio, although the pace of user descends, can with power seldom, make wheelchair continue to move ahead.

When user need to change direction, main shaft 7 two ends covers had bearing 10, and two handwheels 11 can be rotated by friction speed.By rotating handwheel 11, namely can change direction of advance.

When the wheelchair speed, want to slow down, or when having tendency toward sliding to want to park, can be by rolling brake mechanism 3, increasing friction force is realized.

A kind of variable-ratio wheelchair of this utility model for the particularity that uses the crowd with the special circumstances when using, adopts the gear train kind of drive of different drive ratios to reach the purpose of machine driving speed change.When running into different condition of road surface, select different travel speeds, can allow user get a promotion in the ability by special road section.Simultaneously, the pull bar that increases on structural design has improved the only situation of armrest center wheel drive power wheelchair of user, has improved greatly the ease of use of wheelchair.

The above is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes this utility model description to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present utility model.

Claims

1. variable-ratio wheelchair comprises: can install backrest and medicated cushion chair frame, rely on the universal wheel below left and right handwheel, arrestment mechanism and the pedal that bearing coordinates with the chair frame main shaft; Described main shaft is fixed on below described chair frame by support; It is characterized in that: some gears are equipped with in the centre position of described main shaft; The both sides of the above some gear of main shaft are connecting the power-assist trailing wheel by support bar; Gear also is equipped with in described chair frame below; Described gear is positioned at the upside of described main shaft, and by gear transmission mode and the interlock of described main shaft.

2. a kind of variable-ratio wheelchair according to claim 1, it is characterized in that: described gear comprises: rotating shaft, change-speed gearing, gear lever and pull bar; Described rotating shaft is parallel with described main shaft, some change-speed gearings at rotating shaft middle part can with described main shaft on meshed transmission gear; Described rotating shaft one end is fixed with described gear lever, and the other end is connecting described pull bar.

3. a kind of variable-ratio wheelchair according to claim 1, it is characterized in that: described pull bar is connected with described rotating shaft by single direction ratchet, and retracting spring is equipped with in the junction; The arc-shaped rack of described pull bar bottom and the engagement of the gear on described single direction ratchet axle.