CN1032412C - Stabiliser system for vehicles - Google Patents

Abstract

A supporter device for two wheeled vehicles comprises a supporting rod with an upper end rotatably connected with a rear wheel shaft or vicinity thereof and a lower end provided with a cross shaft for loading a supporting wheel and a roller wheel coupled with vehicle wheels. The device further comprises a means for descending the supporting rod and used to pull the cross shaft below the vehicle wheels to allow the conjugation of the tyre and the roller wheel, thereby being lifted from the ground. The means for descending the supporting rod comprises a rotating member, a manual actuator for moving the rotating member to conjugate with the tyre of the rear wheel, allowing the rotating member to rotate, a rolling disk driven by the rotating member to rotate, a flexible element capable of being twisted around a rotary disk and connected with the supporting rod, allowing the rolling disk to rotate to pull the flexible element onto the rolling disk and pull the roller wheel below the vehicle wheel.

Description

The bracing or strutting arrangement of two-wheel car

The present invention relates to the bracing or strutting arrangement of two-wheel car, particularly the bracing or strutting arrangement of cyclist's bicycle driven.More specifically, the present invention relates to, but be not to be confined to bicycle or assisted pedal stroke bicycle.

Because road intersects, vehicle ' is slow, traffic congestion, road building and other obstacle, the cyclist will be stopped and restart continually in the city.The cyclist often meets these situations by bike in the city, when the cyclist will be stopped suddenly, he may lack of equilibrium, and potential danger is so just arranged.

Under above-mentioned these traffic conditions, the cyclist must step down in a pin or two pin on the ground when each the parking, must get off in many cases.The cyclist is said, stop suddenly continually and reset very inconvenient.Owing to lack of equilibrium, be obstructed and impetuous etc., especially when the band weight travels, more have act danger.

The design of bicycle and cyclist's body sizes change makes seat too low for the foot pressure of remaining valid sometimes, but sometimes when stopping human body keep too high again on the seat, this just causes frequently getting on or off the bus.

A kind of bracing or strutting arrangement is disclosed in WO90/09918A1, be used in particular for bicycle, it comprises the device that a pole and descends pole, be connected rotationally near the wheel shaft of pole upper end and a wheel or its, there is a transverse axis pole lower end, is adorning a support wheel and a roller, and the device that pole is descended can be moved transverse axis to and is lower than wheel (being generally trailing wheel), cause makes tire engage with roller, and makes wheel lift away from ground.Adopt this structure, most of weight of cyclist passes to ground by wheel, roller, transverse axis and support wheel.

The disclosed device that pole is descended is included in a reel on the axis in WO90/09918A1, by anti-tap pedal, cable wire is moved on the reel from the lower end of pole, and is made pole decline.Though this structure is gratifying, some cyclists think that anti-tap pedal is not easy control and accomplishes when stopping.In addition, the power of reduction pole must be provided by the cyclist.In addition, though this device can be designed to be attached on the present bicycle, it is more suitable in using as the primitive apparatus dress.

The objective of the invention is to overcome the shortcoming that the two-wheel car bracing or strutting arrangement exists in the prior art, a kind of improved bicycle supporting device is provided, the cyclist can get off and bicycle is stopped, and can make pole decline easily and support bicycle.

For realizing above-mentioned purpose of the present invention, the invention provides a kind of bracing or strutting arrangement of two-wheel car, the device that comprises a pole and pole is descended, near the hind axle of described pole upper end and bicycle or be connected rotationally, the one end has a transverse axis, the roller of adorning support wheel and engaging with wheel, and the device that pole is descended can be moved transverse axis to and is lower than wheel, tire is engaged with roller, and make wheel lift away from ground, according to the present invention, the described device that pole is descended comprises a tumbler, is used for making tumbler to move to engaging with the tire of described trailing wheel and artificial actuator that tumbler is rotated first reel that can be driven rotation by tumbler, and one can be on rotating disk and with pole bonded assembly flexible member, make the turning handle flexible member position of reel to reel and roller move to wheel below.

Best, described tumbler and reel are contained on the common axis, can rotate together, and be best, and they are contained in the front of trailing wheel.In a most preferred embodiment structure, adorning second reel that rotates with first reel on the described transverse axis, one section cable wire is wound into pole from each volume.Described transverse axis preferably is contained on the rocking arm, and described rocking arm or link to each other with vehicle frame near an end, can come back rotation around a horizontal axis, best, can one and the vertical plane surface that coincides of back wheels of vehicle plane in swing.Described artificial actuator can comprise a cam to described rocking arm effect, and the connecting device that is connected of the artificial manipulation device who handles with the cyclist (as be contained on the handle grip for bicycle bar) (as Bao (Bowden) cable wire that pauses), this connecting device is used for rotating cam and makes the pole swing.In a kind of possible structure, described cam is installed in rigidly (but adjustable ground) and is fixed on the sagging element on the vehicle frame, and is connected rotationally near described rocking arm and the described sagging element upper end.Described rocking arm and described sagging element install on the vehicle frame by a public pivot pin, and described downward dependent member is also linked to each other with vehicle frame by a connecting rod (preferably adjustable-length), is rigidity to be arranged to described downward dependent member with respect to vehicle frame.

Though can make a kind of primitive apparatus to bracing or strutting arrangement of the present invention, the present invention is particularly suitable for as the bracing or strutting arrangement that is re-fitted on the existing bicycle.

The present invention can realize in practice by different way, still, with reference to the accompanying drawings as an example a bracing or strutting arrangement by the present invention's structure is elaborated, in the accompanying drawing:

Fig. 1 is the part schematic side view at rear portion that the bicycle of bracing or strutting arrangement of the present invention is housed; Its ratio Fig. 2,3,5 ratio are smaller;

Fig. 2 is the part drawing in side sectional elevation along II among Fig. 3-II line intercepting, but for being clearly shown that structure, hatching has been done some adjustment;

Fig. 3 is the enlarged side view that bracing or strutting arrangement shown in Figure 2 cuts open part;

Fig. 4 is the part top view of the bicycle supporting device seen along arrow portion direction among Fig. 1;

Fig. 5 is the lateral plan that amplify the part in zone shown in the arrow V among Fig. 1;

Fig. 1 shows the trailing wheel 11 of bicycle with simple form, and it has a rear-wheel hub 12, and its both sides install on the gusset 13 of termination of the seat stay 14 that is soldered to seat and chain stay 15.Bicycle has one to be contained in following bottom bracket 16, and it and seat tube 17 are connected with another root down tube 18, and this bearing seat 16 is equipped with the bearing of axis (pedal axle) 19.Adorning the sprocket wheel (not shown) on the axis 19, chain is reaching on the flywheel on the rear-wheel hub 12 around sprocket wheel.Bicycle also has a change-gear set (not shown).But bicycle also can have hub-type change speed gear or not be with variable gear.

Make an elongate bracket 24 of flanged steel pressing, near rear-wheel hub 12, a side of the vehicle frame relative with flywheel, link to each other with vehicle frame, in the mid-length of carriage 24, and there is a lug 25 with holes at the edge thereon, and it is clipped between this nut and the gusset 13 by a rear wheel spindle nut.There is lug 27 upper end of the pole of bracing or strutting arrangement (or arm) 26, and it links rotationally at the rear end and the minor axis 21 of carriage 24, can rotate around a horizontal axis, and this horizontal axis is parallel with hind axle 12, but is in the position of this 12 back.Pole 26 is biased into (or inoperative) position (as shown in Figure 1) of rise by a gas spring or other spring 28.Lug 29 in the middle of one end of this spring 28 and the pole 26 is rotatably connected, and has another point to be connected rotationally with the minor axis 30 of rear bearing block 25 front ends in the centre of spring 28 length.

Inboard at carriage 24, adorning a mounting blocks on the pin 22 that can rotate in carriage 24 (can not see in Fig. 1, omission again in Fig. 4) mounting blocks has tapped bore, twisting a bolt 31 in the tapped bore, there is a saddle 31a its upper end, it is connected rotationally with bolt, can rotate around the longitudinal axis of bolt.Prop up saddle 31a and have the lower edge that breach can be put into gusset 13.Mounting blocks, bolt 31 and a saddle 31a constitute an adjustable stop, and it passes to the vehicle frame of bicycle to the load of cw effect (as shown in Figure 1) from pole 26, and can adjust the position of pole 26, will describe in detail below.

An axle sleeve 32 (Fig. 4) is being adorned in the lower end of pole 26, is wherein fixing a hollow transverse axis 33 rigidly.The support that contacts with ground (ground engaging stabiliser wheel) 34,35 free to rotate is being adorned at the two ends of transverse axis 33.Middle region at transverse axis 33 has a roller 36 free to rotate, the planar registration of the general and trailing wheel 11 of this roller 36, and it has two flanges 37 that separate, and when bracing or strutting arrangement was worked, they can snugly engage with the two edges of tire, will describe in detail below.

A pair of axle sleeve 38 is arranged on the both sides of roller 36, and pin 39 is fixed to them on the transverse axis 33 rigidly, is fixing a fairlead 41 that is shaped on this two axle sleeve 38.This plate 41 generally is a C shape, and the end that has connecting bridge 43, two support arms 42 of an a pair of support arm that separates 42 and a rectangle is curved (as shown in Figure 5), so that corresponding with the radian of the outside face of axle sleeve 38.One diagonal panels 44 is fixed on axle sleeve 38 and the fairlead 41, so that rigidity to be provided.The outward flange of fairlead 41 is provided with deep groove 45, and for cable wire 46 provides a guide groove, cable wire and groove are easy fits, and it can slide along all directions in guide groove.The curve of the outer end of the support arm 42 of fairlead 41 provides the suitable transition region (as shown in Figure 5) at groove 45 each end.By a mono-connector 47 two ends of cable wire are linked up formation one closed ring, this connector 47 is again a device of regulating the length of this ring.

The angle of plate 41 (shown in Fig. 1 and 5) has two effects.At first, when pole 26 moves to control position, this plate keeps contacting (following will the explanation) with the ground disengagement, even part or all of when flat when tire, also is like this.Secondly, when cable wire 46 enters and leaves groove 45 and part around axle sleeve 38, the change direction path of cable wire 46.This axle sleeve 38 cannot not be rotatable, therefore increases friction between axle sleeve 38 and cable wire 46, and cable wire is reduced the load that plate 41 applies.Though this friction helps reducing the load that is applied on the plate 41, it is not big to the slip that can stop cable wire along its length direction, so that the extension of the cable wire part of bicycle both sides is equated.The determining of plate 41 inclination angle sizes will guarantee to produce around the suitable friction of axle sleeve 38, makes plate 41 that the ground clearance of requirement is arranged simultaneously.

Front end near the chain stay 15 of bottom bracket 16 clips an adjustable bearing 51, is adorning a middle part horizontal pivot 52 above, and it can rotate the upper end (Fig. 2,3) of Rocker arm 53 in the plane of trailing wheel 11.

The carriage 54 of a U-shaped is being adorned in the lower end of the Rocker arm 53 that is formed by a square tube, and carriage 54 has a pair of arm of stretching to the back lower place 55, and the arm end is porose, the bearing of built-in shaft 56.On the axle 56 between two arms 55, fixing a tumbler that engages with tire (or roller) 57 and a pair of reel or capstan winch 58 rigidly.Wheel 57 has outer rim 57a and central channel 57b, and they all have tooth, so that between tire and the wheel 57 good joint is arranged.For helping this, the tooth on the outer marginal circumference is with respect to the tooth displacement half tooth distance in the groove.

In the structure of being discussed, the diameter of the roller 57 that engages with tire is about six times of diameter of the bottom land in each reel 58.Certainly wish that roller 57 and reel 58 are big as far as possible, the physical dimension of part limits around the bicycle but this is of a size of.Above-mentioned size can reduce velocity of rotation greatly, increases effective torque, reduces wheel 57 and fitly is placed on the reel in slip on the tire and assurance cable wire 46, will illustrate below.

Bicycle supporting device comprises that one activates device, and it has a stator unit 61, and this unit comprises a box spare 62.This box spare 62 just is being considered as triangle, back rotation can be come around the pivot 52 of bearing 51 in angle on it, and can be held in place by an adjustable length strut 63, the lug 64 of these bar 63 1 ends and box spare 62 is by pivotal joint, and the adjustable clamp on the other end and the preceding down tube 18 passes through pivotal joint.Extending a lateral pin 66 between the sidewall of box spare 62, adorning a cam 67 above it, this cam 67 has the salient angle 68 that engages with Rocker arm 53 and the arm 69 that is used for linking to each other with an end of the core of the Bao Dun that inserts (Bowden) cable wire 75.This cable wire extends to (not shown) on the manual handling bar on the handle grip for bicycle.The cover of this Bowden cable 75 is fixed to the antetheca of box spare 62 adjustablely.For following will illustrative purposes, the joystick on handle has a locking control position and one second bar, this second bar can make joystick throw off from control position.

From bottom near box spare 62, extend housing 76 from box spare 62 both sides, it includes the bevelled flanged track adjusting wheel 77 that can rotate on transverse axis 78, and this taper increases towards vehicle centre-line.

The layout of cable wire 46 following (shown in Fig. 2,4,5).Box hat 46 extends to a track adjusting wheel 77 before an end of the groove fairlead 41 45, and then extends rearward to a reel 58.Extend through a hole 79 of passing the inner edge of described reel 58 then, and the roller 57 that engages with tire and the inner edge of another reel 58.Cable wire is walked around another track adjusting wheel 77 from this reel 58 again, extends rearward to the other end of groove 45, and finishes this ring along groove.Housing 76 has opening, can allow cable wire lead to guiding roller 77 and draws back from track adjusting wheel.

The operation of bracing or strutting arrangement is as follows: when normally riding, bracing or strutting arrangement is in the state of Fig. 1, and pole 26 is in the position of rise.Because gas spring 28 tends to make pole 26 to rotate in the counterclockwise direction, and makes pole 26 remain on this raised position, as shown in Figure 1, and the tendency of rotating is offset by the pulling force of box hat 46.When the cyclist wants to stop and will come the supported cart period of the day from 11 p.m. to 1 a.m with bracing or strutting arrangement, also can handle control stalk, it is moved on to control position from off-position.Like this, cam 67 just rotates (shown in Fig. 1,3) along clockwise direction, thereby cam crown 68 makes Rocker arm 53 rotate counterclockwise (shown in Fig. 1,3), engages roller 57 with tire and engages with the tire along the trailing wheel 11 of arrow 91 directions rotation just and make.This roller 57 rotates along arrow 92 directions like this, and reel 58 rotates coiling box hat 46 along same direction.Make pole 26 forward the control position that is lower than trailing wheel 11 to from off-position shown in Figure 1 like this, the ground engaging stabiliser wheel 34,35 that makes bracing or strutting arrangement with contact, and roller 36 engages with the tire of trailing wheel 11, this is because the upper end of pole 26 is installed and owing to had the degree of compressibility of the pole 26 of spring-loaded Collapsible structure and cause with respect to the rotating shaft of trailing wheel 11 is eccentric.When ground engaging stabiliser wheel 34,35 and the roller 36 that engages with tire moved below trailing wheel 11, trailing wheel 11 lifted away from ground, and pole 26 continues to do the cw motion, till can not moving again.The cyclist can make this action take place when bicycle stops basically.Most of weight of cyclist and bicycle will be sent to ground by tire, roller 36 and ground engaging stabiliser wheel 34,35, have only sub-fraction weight to transmit by pole 26.As can be seen, as long as bicycle keeps basic erectility, do not need the cyclist leg support on the ground, bracing or strutting arrangement just can be supported on erectility to bicycle.In addition, the cyclist can get off, and bicycle is stayed stop position.

Telescopic pole 26 has control apparatus, in this specific embodiment, be the thread rod that there is knob 95 upper end, the pre-compression force of the spring of the variable intensity that is provided with between two contractable element of pole 26 with this knob scalable is to adapt to the cyclist of Different Weight.

When the cyclist thought to ride again, the control stalk on the release handle made cam 67 withdrawals, and Rocker arm 53 clockwise rotates (as shown in Figure 3), and the roller 57 and the tire of trailing wheel 11 are thrown off, and removed the constraint that reel 58 is rotated.One spring can be set, and cw bias voltage roller 57 impels roller 57 to leave tire motion.Pole 26 is loosened when bicycle brake at gas spring 28 and, trailing wheel from the roller 36 during toward the whereabouts bicycle have under the effect of proal tendency and be moved back into retracted position.Simultaneously, cyclist's tap pedal, bicycle just can be ridden reposefully.

Since cable wire can be in the groove 45 of plate 41 longitudinal movement, bracing or strutting arrangement can evenly be pressurizeed by the both sides of cable wire 46, both sides do not have equal length when therefore not needing to guarantee beginning, and the inhomogeneous tension in both sides of uneven coiling between two reels 58 and cable wire can compensate voluntarily.

When beginning to assemble bracing or strutting arrangement, the adjustable stop that is provided by bolt 31 is adjusted to and is settled carriage 24 and lug 27 suitably, therefore because the off-centre between the pivot of the axle of rear-wheel hub 12 and pole 26, when pole 26 at retracted position, it is enough far away that roller 36 leaves tire, is in control position and work as pole 26, and bicycle rear is upgraded ground by roller 36, the axle close enough of roller 36 and rear-wheel hub 12, this has considered suitable airtyred compressibi1ity.

Fall if the tire part is flat, pole 26 can travel forward above control position, and under the complete flat situation of tire, pole 26 can arrive the front of upright position, and cyclist's the weight in fact wall of the flattening by wheel rim and tire passes to roller 36.Like this, bracing or strutting arrangement still is in work, and pole 26 can be too not stressed.But the cyclist can not ride from dead ship condition easily again, because this requires trailing wheel to stride across roller 36.This just provides a significantly indication to the cyclist: tire has been in flat state.

Though this structure makes that acting on main power all on the carriage 24 always produces a clockwise moment (as shown in Figure 1) to carriage, but in some cases, as ride on the boulder or on the pit or ride down curb, may there be an inverse time needle force, produce a moment, cause vibration and a saddle 31a and gusset 13 disengagements of pole 26.One second adjustable stop (being similar to the backstop of being made up of mounting blocks, bolt 31 and a saddle) is set on the galianconism of carriage 24, and gusset 13 is engaged with the rear portion of hind axle 12, can prevent the problems referred to above.Because this second adjustable stop does not bear any service load, comparable first backstop of its weight is lighter.

Can understand various remodeling can be arranged and install element additional, some remodeling will be discussed below and install additional structure discussed above.

(see figure 2) in bracing or strutting arrangement shown in the drawings, cable wire 46 be passed in two on the reel inner edge and engage hole 79 in the roller 57 with tire.Adopt import that this structure is located at the hole in the two reel inner edges suitably enlarging to avoid damaging cable wire.In a remodeling structure, be provided with groove at the periphery of two inner edges of reel and the periphery that engages roller 57 with tire, and setting is as the return at bottom land, or the top cover that screws with screw, so that cable wire is fixed in the groove.This texture ratio hole 79 has advantage, is exactly that it does not need to allow cable wire 46 pass the passage in hole 79.As long as any point on cable wire 46 length is placed in the groove, just can make cable wire 46 become closed-loop shaped at the very start.This is for can be convenient to operation to the unfamiliar bicycle user of bicycle mechanical.

Though it is 6: 1 with tire with diameter ratio at the bottom of the reel that casehistory engages roller 57, also can be with the arbitrary ratio between 2: 1 to 10: 1.Would rather be rolled onto radius on the reel to cable wire to increase with larger-diameter reel.But preferably the reel diameter is big more, but the power that is applied on the cable wire increases less.

Though described carriage is a rolled-up stock, also can use metal forging or other structure.

Though described pole 26 has the compressive pre-stress device of the spring between two scalable parts adjusting pole, this is not necessary.Also can require to be provided with the device of the initial length of adjusting pole.Like this, the pole of single structure can adapt to the bicycle of different size.

When bracing or strutting arrangement is operated, swing to the too left side in order to prevent pole 26, inhibiting device can be set, preferably be contained on the gas spring 28.Therefore the hydraulic actuating cylinder of gas spring can have an interior backstop that engages with piston, and perhaps piston rod can have a backstop that engages with the hydraulic actuating cylinder termination.The above-mentioned compression spring that either way provides when arriving end position, can prevent undue impact.

Some characteristic requires emphasis in the structure.Notice that gas spring 28 is in the middle position of gas spring with carriage 24 rotating joints, and this position is nearer than the distance of closed end with piston rod import distance.This installation with common gas spring is different, and they are installed in the two ends of gas spring.Must notice that also the saddle 31a on bolt 31 engages with gusset 13, rather than engage with chain stay 15.This gusset 13 is one the element of suitable intensity to be arranged, and chain stay 15 is relatively thinner pipes, is not suitable for being used for resisting the power that side direction applies.

At last, should be noted that Rocker arm 53 and stator unit 61 are provided with mono-horizontal pivot 52 to be convenient to promptly this bracing or strutting arrangement is installed on the bicycle of tool different size and profile.

Claims (16)

1. the bracing or strutting arrangement of a two-wheel car, comprise a pole, its upper end and the hind axle of car or neighbouringly be connected rotationally, there is a transverse axis its lower end, the roller of adorning cover keep lever and engaging with wheel, with the device that pole is descended, can move transverse axis to and be lower than wheel, tire is engaged with roller, and make wheel lift away from ground, and it is characterized in that the described device that pole is descended comprises: a rocking arm, its upper end or contiguous upper end link to each other with vehicle frame, can come back rotation around a horizontal axis, and one tumbler is housed in the lower end of rocking arm; Be used for a vertical plane surface of trailing wheel planes overlapping in rocking arm is turned to engage and artificial actuator that tumbler is rotated with rear tyre, one be contained in the public axle of tumbler on can be with the reel of its rotation; With one on rotating disk and with pole bonded assembly first flexible member, the turning handle flexible member of reel is moved on the reel and roller moved under the trailing wheel, so that trailing wheel is lifted away from ground, and trailing wheel is propped up with cover keep lever.

2. according to the bracing or strutting arrangement of claim 1, it is characterized in that adorning on the described transverse axis second reel that rotates with first reel and can be on second reel and with pole bonded assembly second flexible member.

3. according to the bracing or strutting arrangement of claim 2, it is characterized in that described two parts that flexible member is a single cable wire, this cable wire is wound into a guide piece of being adorned by transverse axis from a volume, again around arriving another reel.

4. according to the bracing or strutting arrangement of claim 3, it is characterized in that described cable wire forms a closed ring, directly from a reel through another reel, and by described guide piece.

5. according to each bracing or strutting arrangement in the claim 2 to 4, it is characterized in that every described cable wire from separately reel extend around forward one leading to device, reach described pole then backward.

6. according to the bracing or strutting arrangement of claim 5, it is characterized in that described leadingly be spaced from each other to the device side, the distance that separates is bigger than described reel side direction distance spaced apart from each other.

7. according to the bracing or strutting arrangement of claim 6, it is characterized in that described leading be bevelled to device so that increase towards the centerline diameter of vehicle.

8. according to each bracing or strutting arrangement in the claim 1 to 4, it is characterized in that described tumbler and reel are positioned at the front of trailing wheel.

9. according to the bracing or strutting arrangement of claim 1, it is characterized in that described actuating device comprises a cam to described rocking arm effect, and the connecting device that is connected with the manual operation device of cyclist's manipulation.

10. according to the bracing or strutting arrangement of claim 9, it is characterized in that described cam connects near being installed in the sagging element upper end that is fixed to rigidly on the vehicle frame rotationally.

11., it is characterized in that described rocking arm and described sagging element install on the vehicle frame by a public pivot pin according to the bracing or strutting arrangement of claim 10.

12., it is characterized in that it is rigidity that described downward dependent member also links to each other to be arranged to respect to vehicle frame by a connecting rod with vehicle frame to described downward dependent member according to the bracing or strutting arrangement of claim 11.

13. according to each bracing or strutting arrangement in the claim 1 to 4, it is characterized in that described pole is connected rotationally with the part that extends back of carriage, the middle part of described carriage is porose, can insert hind axle, on the extendible portion forward of described carriage and pole, be lower than below pole and the carriage pivotal joint point a bit between extending a spring, a backstop is being adorned in front, hole at described carriage, and this backstop engages and prevent that carriage from rotating along the direction that makes extendible portion rising forward around hind axle with vehicle frame.

14. according to the bracing or strutting arrangement of claim 13, it is characterized in that described backstop is adjustable, to rise or to be reduced in the pivot between pole and the carriage.

15. according to the bracing or strutting arrangement of claim 13, it is characterized in that described carriage has a galianconism and long-armed, galianconism is connected with pole is rotating, long-armedly is connected rotationally with spring.

16. bicycle that is equipped with according to the bracing or strutting arrangement of claim 1, comprise front and rear wheel, handlebar, the bracing or strutting arrangement of vehicle body and this bicycle, this bracing or strutting arrangement comprises a pole, its upper end and the hind axle of car or neighbouringly be connected rotationally, there is a transverse axis its lower end, the device of adorning cover keep lever and the roller that engages with wheel and pole being descended can be moved transverse axis to and is lower than wheel, tire is engaged with roller, and make wheel lift away from ground, it is characterized in that the described device that pole is descended comprises: a rocking arm; Its upper end or contiguous upper end link to each other with vehicle frame, can come back rotation around a horizontal axis, and in the lower end of rocking arm one tumbler are housed; Be used for a vertical plane surface of trailing wheel planes overlapping in rocking arm is rotated engages and makes the artificial actuator of tumbler rotation with rear tyre, one be contained in tumbler public spool on can be with the reel of its rotation; With one on rotating disk and with pole bonded assembly first flexible member, the turning handle flexible member of reel is moved on the reel and roller moved under the trailing wheel, so that trailing wheel is lifted away from ground, and trailing wheel is propped up with cover keep lever.

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