CN203280609U - Wheelchair capable of climbing steps - Google Patents
Wheelchair capable of climbing steps Download PDFInfo
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- CN203280609U CN203280609U CN2013203504576U CN201320350457U CN203280609U CN 203280609 U CN203280609 U CN 203280609U CN 2013203504576 U CN2013203504576 U CN 2013203504576U CN 201320350457 U CN201320350457 U CN 201320350457U CN 203280609 U CN203280609 U CN 203280609U
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Abstract
The utility model discloses a wheelchair capable of climbing steps. The wheelchair capable of climbing steps comprises a wheelchair frame, front supporting wheels, rear supporting wheels, front supporting legs, rear supporting legs and shafts. The wheelchair capable of climbing steps is characterized in that the wheelchair further comprises parallelogram mechanisms and ratchet mechanisms. Due to the fact that the length-adjustable parallelogram mechanisms are adopted as a tool for climbing steps and the detachable ratchet mechanisms are arranged between the parallelogram mechanisms and the rear supporting wheels for power connection, the wheelchair is capable of climbing various steps. Furthermore, a seat of the wheelchair is made parallel to the ground during step climbing, and therefore the safety factor of a user is improved.
Description
Technical field
This utility model relates to the wheelchair technology, is specially a kind of wheelchair of climbing step.
Background technology
Common wheelchair can facilitate the people with disability to walk, but wheelchair just can be restricted when running into step, and people with disability's range of activity is suffered restraints.
, for addressing this problem, mainly contain at present the crawler type wheelchair of stair climbing and utilize planetary gear to climb the wheelchair of step backward forward.Application number is to have introduced a kind of crawler type wheelchair of stair climbing backward forward in 200820191165.1 patent, to the effect that in the bottom of wheelchair, installing crawler belt additional or changing original wheel chair wheel into crawler belt of this patent, realize the step ability of climbing of wheelchair by the approach angle before and after the design crawler belt and the height that leaves angle and pedrail mechanism.This scheme can solve the step problem of climbing of wheelchair in theory, but because pedrail mechanism and wheelchair are relative static, when wheelchair is climbed step because crawler belt can be along with the fluctuating of step forms angle with ground, wheelchair also form angle with ground, because the system gravity of wheelchair and people's composition is higher, so can cause unsafe factor to the people under the effect of gravity and this angle, wheelchair is rolled backward make the people injured.In addition, while due to crawler belt, with ground, contacting, frictional force is larger, will cause like this wheelchair to turn to difficulty, namely needs larger power when turning to, and crawler belt also can damage the edge of step.In a word, crawler type is climbed the step wheelchair can realize the climbing of step, but exist dangerous, turn to the shortcomings such as difficulty, fragile step.
Utilize planetary gear to realize that the technical scheme of climbing the step performance of wheelchair has a lot, patent 201120066782 has been introduced a kind of meeting and has been climbed the wheelchair of step, change the front-wheel of common wheelchair (directive wheel) into planetary gear in this patent, improved the obstacle climbing ability of wheelchair by the revolution of planetary gear.A kind of electric stairs-climbing wheelchair that a kind of stair-climbing wheel chair that patent 201120141381 is introduced and patent 201120181617 are introduced is all to have changed the trailing wheel of common wheelchair into planetary gear.The implication of planetary gear: planetary gear is exactly to have a main revolute pair at the center of planetary gear, and main revolute pair connects wheelchair and planet carrier, and planet carrier can be rotated around main revolute pair; Have several secondary revolute pairs on planetary wheel carrier, these secondary revolute pairs are evenly distributed on planet carrier and are used for connecting planet carrier and planetary gear.Whole like this planet circular system both can be around main revolute pair revolution, and planetary gear again can be around paying the revolute pair rotation.These patents are all to utilize the revolution of planet circular system technical ability can these characteristics of rotation realize the climbing of wheelchair to step again.But no matter be that wheelchair front wheel is changed into planet circular system or changes trailing wheel into planet circular system, all keep away unavoidable planet circular system and do significantly center fluctuation when revolution, this fluctuation can make the people feel very uncomfortable and bring potential safety hazard.When two planetary gears being arranged simultaneously during kiss the earth in planet circular system, wheelchair is in stays.The shoulder height of climbing of planetary gear train type wheelchair is subject to the restriction of planet carrier size in addition, and the planet carrier radius is larger, and the step ability of climbing of wheelchair is stronger, but while moving, the center fluctuation is also just larger.The planet carrier radius is less, while climbing step center fluctuation also less, more weak but the step ability of climbing of wheelchair also can become.
The utility model content
For the deficiencies in the prior art, the technical problem that this utility model quasi-solution is determined is: a kind of wheelchair of climbing step is provided.When this wheelchair travels on level land, mobility is good, steady safety while climbing step, and the kind that can climb step is many, and is of many uses.
The technical scheme that this utility model solve the technical problem is: design a kind of wheelchair of climbing step, this wheelchair comprises wheelchair frame, front support wheel, rear support wheel, front support foot, rear support foot and axle, it is characterized in that this wheelchair also comprises parallel-crank mechanism and ratchet mechanism; Described parallel-crank mechanism is a quadric chain, comprises driving crank, driven crank, driving-belt, connecting rod, front wheel driving foot, rear drive foot and crank axle; Driving crank is arranged on axle through the ratchet revolute; Driven crank is arranged on crank axle through revolute; The two ends of connecting rod respectively with driving crank be connected crank and be connected and form the connecting rod revolute; Connecting rod is in the wheelchair outermost, connects with driving-belt between driving crank and driven crank, with being connected to form of connecting rod, crossing of driving crank and driven crank is retrained; Front wheel driving foot and rear drive foot are vertically welded in respectively on connecting rod, and the length of driving crank and driven crank is equal in length, be present in the equal in length of distance and connecting rod between two hinges of wheelchair frame upper support driving crank and driven crank, make the shape parallelogram of this quadric chain under kinestate arbitrarily;
Described ratchet mechanism comprises ratchet fixture block, ratchet, sliding sleeve and rear-wheel hub; Ratchet, sliding sleeve and rear-wheel hub are arranged on axle through separately revolute respectively, and ratchet is installed by driving crank, and the ratchet fixture block is installed between the two, form the ratchet-type kinematic pair; Rear-wheel hub is installed between ratchet and rear support wheel, and driving crank, ratchet and rear-wheel hub are connected by ratchet-type kinematic pair and three's spline and sliding sleeve, form firm being dynamically connected; Sliding sleeve can move left and right, and controls the power transmission mode between rear support wheel and driving crank and ratchet;
Described rear drive foot comprises the rear drive telescopic leg of regulation and control rear drive foot length, and the front wheel driving foot also comprises the front wheel driving telescopic leg of regulating front wheel driving foot length; Equally, described front support foot and rear support foot include its back and front supporting telescopic leg of feet length separately of regulation and control.
Compared with prior art, this utility model has adopted length-adjustable parallel-crank mechanism as the instrument of climbing step, and adopt detachable ratchet mechanism to be connected as power between parallel-crank mechanism and rear support wheel, thereby wheelchair has the ability of the multiple step of climbing; And the seat that can guarantee wheelchair when climbing step is parallel to the ground, thereby has improved the safety coefficient of user.
Description of drawings
Fig. 1 is the overall structure schematic diagram that this utility model can be climbed a kind of embodiment of step wheelchair.
Fig. 2 is the parallel-crank mechanism assembling schematic diagram that this utility model can be climbed a kind of embodiment of step wheelchair.
Fig. 3 is the ratchet mechanism structural representation that this utility model can be climbed a kind of embodiment of step wheelchair.Wherein,
Fig. 3 (A) is the ratchet mechanism assembling schematic diagram that this utility model can be climbed a kind of embodiment of step wheelchair;
Fig. 3 (B) is the ratchet mechanism cross-sectional view that this utility model can be climbed a kind of embodiment of step wheelchair.
The specific embodiment
Be described in further detail this utility model below in conjunction with embodiment and accompanying drawing thereof.
The wheelchair of the climbed step of this utility model design (being called for short wheelchair, referring to Fig. 1-3), comprise wheelchair frame 1, front support wheel 2, rear support wheel 3, parallel-crank mechanism 4, front support foot 5, rear support foot 6, ratchet mechanism 7 and axle 8; Wherein, back and front supporting wheel 2,3 and back and front supporting foot 5,6 are two, and symmetry is arranged on the both sides of wheelchair; Described front support wheel 2 and rear support wheel 3 are rotatable, can realize that wheelchair moves freely on level land; Rear support wheel shaft 8 is welded on wheelchair frame 1, and rear support wheel 3 is arranged on axle 8, and front support foot 5, rear support foot 6 are fixed on wheelchair frame 1; Described feet 5,6 all comprises a joint telescopic leg, can adjust feet 5,6 length by regulating telescopic leg.
Described parallel-crank mechanism 4 is quadric chains, comprises driving crank 41, driven crank 42, driving-belt 43, connecting rod 44, front wheel driving foot 45, rear drive foot 46 and crank axle 47; Driving crank 41 is arranged on axle 8 through the ratchet revolute; Crank axle 47 is welded on wheelchair frame 1, and driven crank 42 is arranged on crank axle 47 by revolute; The two ends of connecting rod 44 respectively with driving crank 41 be connected crank 42 and be connected and form the connecting rod revolute; Connecting rod 44 is in the wheelchair outermost, connects with driving-belt 43 between driving crank 41 and driven crank 42, with being connected to form of connecting rod 44, crossing of driving crank 41 and driven crank 42 is retrained; Front wheel driving foot 45 and rear drive foot 46 are vertically welded in respectively on connecting rod 44, and the length of driving crank 41 and driven crank 42 is equal in length, be present in the equal in length of distance and connecting rod 44 between two hinges of wheelchair frame 1 upper support driving crank 41 and driven crank 42, make the shape parallelogram of this quadric chain under kinestate arbitrarily.
Described ratchet mechanism 7 comprises ratchet fixture block structure 71, ratchet 72, sliding sleeve 73 and rear-wheel hub 74; Ratchet fixture block structure 71 is comprised of ratchet fixture block 711 and spring 712, and an end of spring 712 contacts with driving crank 41, and the other end is connected with ratchet fixture block 711, and ratchet fixture block 711 contacts with ratchet 72 away from an end of spring 712; Ratchet 72, sliding sleeve 73 and rear-wheel hub 74 are installed on axle 8, and ratchet 72 is by driving crank 41 and form the ratchet revolute, and ratchet fixture block structure 71 is installed between the two, forms the ratchet-type kinematic pair; Rear-wheel hub 74 is installed between ratchet 72 and rear support wheel 3, can be by spline nested link together of its surperficial spline with sliding sleeve 73 inside between rear-wheel hub 74 and ratchet 72; Rear-wheel hub 74 is connected by spoke with rear support wheel 3; Sliding sleeve 73 can move left and right with hands, controls the power transmission mode between rear support wheel 3 and driving crank 41 and ratchet 72, when 73 of sliding sleeves are positioned on rear-wheel hub 74, there is no power transmission between rear support wheel 3 and driving crank 41 and ratchet 72; In the time of on sliding sleeve 73 moves to rear-wheel hub 74 and ratchet 72, the spline of sliding sleeve 73 and both splines nest together, the power of rear support wheel 3 is delivered to ratchet 72 by rear-wheel hub 74, by the ratchet revolute between ratchet 72 and driving crank 41, transmission of power is arrived parallel-crank mechanism 4 again, drive parallel-crank mechanism 4 runnings; When sliding sleeve 73 and driving crank 41, ratchet 72, when rear-wheel hub 74 all is combined, rear support wheel 3 directly drives parallel-crank mechanism 4 to transmission of power to driving crank 41 and operates.
Described rear drive foot 46 comprises rear telescopic leg 461, can realize by regulating rear telescopic leg 461 length of rear drive foot 46.Equally, front wheel driving foot 45 also comprises front stretching foot 451, the length that also can regulate front wheel driving foot 45 by regulating front stretching foot 451.
The parallel-crank mechanism of this utility model wheelchair is the driving mechanism that this wheelchair realizes climbing the step ability, and its effect is the rotation of wheel to be converted to translation and the lifting campaign of wheelchair, is characterized in keeping wheelchair parallel with ground in motor process.The specific works principle is as follows: front wheel driving foot 45 and the rear drive foot 46 vertical with connecting rod 44 are housed on connecting rod 44, the user makes connecting rod 44 parallel to the ground by adjusting two length that drive foot, draw wheelchair frame 1 according to the character of above-mentioned parallelogram parallel to the ground, thereby realized that wheelchair steadily climbs the function of step, the safety that has improved wheelchair.
The described ratchet mechanism of this utility model wheelchair is a kind of one-way intermittent motion mechanism, only allows wheelchair to travel forward during upper and lower step, prevents that wheelchair from falling back and producing danger on step.Ratchet mechanism in this utility model is also being undertaken and is being changed the effect that power connects, namely by sliding sleeve 73 horizontally slip select ratchet mechanism whether to move.When wheelchair travelled on normal road surface, sliding sleeve 73 separated with the spline on ratchet 74, driving crank 41, and rear support wheel 3 freely rotates, and can not pass to parallel-crank mechanism 4 to power; When wheelchair is climbed step, the spline of sliding sleeve 73 on ratchet 72, rear-wheel hub 74 is combined, and when rear support wheel 3 rotates, transmission of power arrived ratchet 72, by ratchet mechanism 7, power reached driving crank 41 again, thereby drive parallel-crank mechanism 4 motions, realize climbing the stability in the process of rank; When wheelchair is got out of a predicament or an embarrassing situation, the combination simultaneously of spline on sliding sleeve 73 and ratchet 72, rear-wheel hub 74, driving crank 41, purpose is that ratchet mechanism is fallen in short circuit, and power directly is delivered to driving crank 41 by rear support wheel 3,4 motions of driving parallel-crank mechanism realize the stability in the process of getting out of a predicament or an embarrassing situation.In addition, on described sliding sleeve (mechanism) 73, limited location mechanism guarantees the reliability that sliding sleeve 73 is worked.
Operation principle and the process of this utility model wheelchair are: when wheelchair travelled on level land, two front support feet 5 of this wheelchair, two rear support feet 6, two front wheel driving feet 45 and two rear drive feet 46 all were retracted and are lifted away from ground., with hands slip sliding sleeve 73, it is all separated with the spline on ratchet 72, driving crank 41, thereby there is no power transmission between driving crank 41 and rear support wheel 3.Under action of gravity, the connecting rod 44 of parallel-crank mechanism can be in the lower horizontal position.At this moment the rear support of wheelchair wheel 3 becomes driving wheel, and armrest promotes rear support wheel 3 and can advance, and also can lean on the Manual-pushing wheelchair to advance, and its specific embodiment is identical with common wheelchair operation.
When wheelchair is climbed step, first with the close step of front support wheel 2.Rotate driving crank 41 with hands, the connecting rod of flat shape quadrangular mechanism 4 44 is forwarded to by dead-centre position parallel with crank and the leading front support wheel 2 of front wheel driving foot 45, regulate the length of front wheel driving foot 45, front support foot 5, rear drive foot 46 and rear support foot 6, until its equal kiss the earth is fixed this length.With hands slip sliding sleeve 73, the spline of sliding sleeve 73 on ratchet 72, rear-wheel hub 74 is combined again, with hands, rotates rear support wheel 3, at this moment wheelchair has two componental movements with respect to ground, and namely forward and straight up, this moment, wheelchair had inclination a little to level.After having climbed first step, wheelchair is supported on ground and the first stage rank by four feets; Then the length of manual adjustments rear support foot 6 makes the wheelchair level, again that rear drive foot 46 length adjustment and rear support foot 6 are equal in length, front wheel driving foot 45 length and front support foot 5 are equal in length, fix its length, then rotate rear support wheel 3 with hands, start to climb the second-order step.Repeat aforementioned process, until climb up last stage rank.In the climbing process, wheelchair can remain level.While climbing to last stage rank, front support wheel 2 has been positioned on step above the ground, at this moment the front support of retracting foot 5 and front wheel driving foot 45, make it be lifted away from ground, rotate again rear support wheel 3, take turns 3 to rear support and be in step top above the ground, retraction rear support foot 6 and rear drive foot 46, make it be lifted away from ground, ensuing operation with reference to or operation when being same as wheelchair and travelling on level land.When wheelchair was got out of a predicament or an embarrassing situation, the spline combination simultaneously on sliding sleeve 73 and ratchet 72, rear-wheel hub 74, driving crank 41, other operation operation when topping bar was just the same.
The length adjustment mechanism of described each feet and driving foot can be threaded sleeve (leading screw) structure, hydraulic pressure or pneumatic actuator, to guarantee the length after the telescopic leg adjustment, remains unchanged.Consider complexity and cost, the length adjustment mechanism of embodiment adopts threaded sleeve (leading screw) structure.
This wheelchair installs parallel-crank mechanism additional on common wheelchair, thereby introduces translation and lifting campaign, realizes the climbing of step; When mild road traveling, the parallelogram four-bar mechanism can be lifted away from ground, drive and advance by wheel as common wheelchair; When climbing step, rotate that wheelchair rear support wheel obtains power and translation and elevate a turnable ladder motion when by ratchet mechanism, passing to parallel-crank mechanism and realize climbing rank with hands, can realize that wheelchair steadily climbs step.
This utility model is not addressed part and is applicable to prior art.
Claims (3)
1. the wheelchair that can climb step, comprise wheelchair frame, front support wheel, rear support wheel, front support foot, rear support foot and axle, it is characterized in that this wheelchair also comprises parallel-crank mechanism and ratchet mechanism; Described parallel-crank mechanism is a quadric chain, comprises driving crank, driven crank, driving-belt, connecting rod, front wheel driving foot, rear drive foot and crank axle; Driving crank is arranged on axle through the ratchet revolute; Driven crank is arranged on crank axle through revolute; The two ends of connecting rod respectively with driving crank be connected crank and be connected and form the connecting rod revolute; Connecting rod is in the wheelchair outermost, connects with driving-belt between driving crank and driven crank, with being connected to form of connecting rod, crossing of driving crank and driven crank is retrained; Front wheel driving foot and rear drive foot are vertically welded in respectively on connecting rod, and the length of driving crank and driven crank is equal in length, be present in the equal in length of distance and connecting rod between two hinges of support driving crank on wheelchair frame and driven crank, make the shape parallelogram of this quadric chain under kinestate arbitrarily;
Described ratchet mechanism comprises ratchet fixture block, ratchet, sliding sleeve and rear-wheel hub; Ratchet, sliding sleeve and rear-wheel hub are arranged on axle through separately revolute respectively, and ratchet is installed by driving crank, and the ratchet fixture block is installed between the two, form the ratchet-type kinematic pair; Rear-wheel hub is installed between ratchet and rear support wheel, and driving crank, ratchet and rear-wheel hub are connected by ratchet-type kinematic pair and three's spline and sliding sleeve, form firm being dynamically connected; Sliding sleeve can move left and right, and controls the power transmission mode between rear support wheel and driving crank and ratchet;
Described rear drive foot comprises the rear drive telescopic leg of regulation and control rear drive foot length, and the front wheel driving foot also comprises the front wheel driving telescopic leg of regulating front wheel driving foot length; Equally, described front support foot and rear support foot include its back and front supporting telescopic leg of feet length separately of regulation and control.
2. wheelchair of climbing step according to claim 1, is characterized in that described front wheel driving telescopic leg and rear drive telescopic leg are threaded sleeve structure, hydraulic pressure or pneumatic actuator.
3. wheelchair of climbing step according to claim 1, is characterized in that described back and front supporting is threaded sleeve structure, hydraulic pressure or pneumatic actuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203504576U CN203280609U (en) | 2013-06-19 | 2013-06-19 | Wheelchair capable of climbing steps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203504576U CN203280609U (en) | 2013-06-19 | 2013-06-19 | Wheelchair capable of climbing steps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203280609U true CN203280609U (en) | 2013-11-13 |
Family
ID=49536992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203504576U Withdrawn - After Issue CN203280609U (en) | 2013-06-19 | 2013-06-19 | Wheelchair capable of climbing steps |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203280609U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103300981A (en) * | 2013-06-19 | 2013-09-18 | 河北工业大学 | Wheelchair capable of climbing up stair |
| CN110540153A (en) * | 2019-08-13 | 2019-12-06 | 温州瑞豪电子有限公司 | Liftable and self-moving operation rack |
-
2013
- 2013-06-19 CN CN2013203504576U patent/CN203280609U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103300981A (en) * | 2013-06-19 | 2013-09-18 | 河北工业大学 | Wheelchair capable of climbing up stair |
| CN103300981B (en) * | 2013-06-19 | 2015-08-19 | 河北工业大学 | A kind of wheelchair of climbing step |
| CN110540153A (en) * | 2019-08-13 | 2019-12-06 | 温州瑞豪电子有限公司 | Liftable and self-moving operation rack |
| CN110540153B (en) * | 2019-08-13 | 2021-07-06 | 温州瑞豪电子有限公司 | Liftable and self-moving operation rack |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131113 Effective date of abandoning: 20150819 |
|
| RGAV | Abandon patent right to avoid regrant |