CN208710424U - The walking wheel construction of travelling aided bicycle - Google Patents

Abstract

The utility model discloses a kind of walking wheel constructions of travelling aided bicycle, including support frame and it is distributed in the wheel of support frame as described above bottom, support frame as described above bottom is provided with axle bed in the position of installation wheel, the axle bed is connected with wheel fork by shaft, in the wheel installation wheel fork, wheel orientation adjustment mechanism is additionally provided on the wheel fork.Wheel can be carried out the conversion of deflecting roller and directional wheel by the utility model, can be adapted to use as travelling aided bicycle respectively and be used steering and orientation to each wheel to require as wheelchair, so that direction of travel is easier to control.

Description

The walking wheel construction of travelling aided bicycle

Technical field

The utility model belongs to medical auxiliary apparatus technical field, is related to a kind of help elderly and infirm, patient's walking And the travelling aided bicycle of wheelchair more particularly to the walking wheel construction of travelling aided bicycle can be converted to.

Background technique

Due to originals such as old age, illness (such as suffering from thrombus, cerebral hemorrhage, cardiovascular patient, wound, certain neurogenic diseases) Cause, some human individuals can lose walking-function or walking-function is incomplete, the person that becomes walking disorder.For disease treatment, Rehabilitation or the purpose for delaying walking-function forfeiture process, it is desired nonetheless to which walking disorder person is able to carry out some step exercises.Separately Outside, some walking disorders person itself has the demand that can be walked also to reduce the dependence to other people.

In previous tradition, walking-function could be completed by mostly using crutch or special messenger to assist in greatly, but crutch lacks in traveling Weary stationarity and safety are easy to fall in jog or disequilibrium, it is possible to causing secondary injury.

Later someone has invented travelling aided bicycle, and wheel can be had by the frame of ground multi-point support, base of frame by usually having Son, since travelling aided bicycle is by ground multi-point support, thus relatively firm, and then the person that can support walking disorder is in gait processes In incidental body inclination so that being not easy to fall in obstacle walking process.For example, CN2491008Y, CN2261833Y, The Chinese patent literatures such as CN101692994A, CN102764190A, CN202505703U, CN104739620A recorded difference The travelling aided bicycle of structure type, such as U.S.Pat.No.8,100,415, U.S. Pat.No.D561,065, U.S.Pat.No.8, 840,124 equal american documentation literatures also recorded the travelling aided bicycle of different structure form.

Excessively a kind of adjustable fupport arm of applicant's once invention and folding wheeled travelling aided bicycle, are documented in the patent No. In the american documentation literature of U.S.Pat.No.9,585,807.The travelling aided bicycle includes that cincture suspension fork mechanism is conducive to pass through unevenness Landform, there is Quick folding mechanism and mechanical brake and adjustable fupport arm and two pairs of handles, one pair of them handle to be located at Front avoids body from inclining so that user is located in the polygon footprint area defined by front wheels and rear wheels to provide support Tiltedly, it is bent and causes the risk fallen.This travelling aided bicycle can promote walking disorder person to the enough supports of upper body weight It is walked with naturally upright gait, most of mobility impaireds can be suitable for.

In order to have the function of travelling aided bicycle outside walk help, applicant also wants to travelling aided bicycle with wheelchair function, can be walked The caregiver of obstacle person pushes forward.For realize traveling process in be easy to control direction of travel, as travelling aided bicycle in use, need To be located at the wheel of front as deflecting roller, the wheel at rear portion is directional wheel；And as wheelchair in use, needing the wheel at rear portion As deflecting roller, the wheel of front is directional wheel.Therefore, it is necessary to have travelling aided bicycle bottom wheel in deflecting roller and orientation The function of being converted between wheel.

Utility model content

The technical problem to be solved by the utility model is to provide a kind of walking wheel construction of travelling aided bicycle, which can facilitate Ground realizes that wheel is converted between deflecting roller and directional wheel, to overcome the shortcomings of the prior art.

In order to solve the above technical problems, the utility model adopts the following technical solution:

A kind of walking wheel construction of travelling aided bicycle including support frame and is distributed in the wheel of support frame as described above bottom, special Sign is: support frame as described above bottom is provided with axle bed in the position of installation wheel, and the axle bed is connected with wheel fork by shaft, institute It states in wheel installation wheel fork, wheel orientation adjustment mechanism is additionally provided on the wheel fork.

In specific embodiment of the present invention, support frame as described above by be located at arranged on left and right sides side rack and connection Intermediate connection frame between the side rack of arranged on left and right sides is constituted.

The wheel is distributed in the front-end and back-end of the side rack.

Wheel orientation adjustment mechanism includes set on the positioning counterbore of the wheel fork dome top surface, on axle bed Pin hole, the positioning pin in the pin hole, spring between pin hole and the positioning pin and are set on the axle bed The positioning pin is inserted or pull out to the eccentric driver plate of the positioning counterbore.

There is spanner on the bias driver plate.

The pin hole is stepped hole, has superposed pore and the gross porosity positioned at lower part, and the positioning pin is ladder Structure, has superposed shaft part and a pin portion thick positioned at the ratio shaft part of lower part, and the shaft part of the positioning pin is from the pin The pore in hole is pierced by, and the positioning pin is located at the gross porosity of the pin hole, and the spring pocket is on the shaft part of the positioning pin, one end It supports at the ladder of the pin hole, the other end is supported at the ladder of the positioning pin；The upper end of the positioning pin is connected to The circumferential surface of the bias driver plate, the bias driver plate is resisted against on axle bed.

In a further arrangement, the pin hole is stepped hole, has the pore of the lower part of the gross porosity on top, and the positioning pin is Hierarchic structure, the shaft part for having pin portion described in the pin portion of lower part and the ratio on top thick, the pin portion of the positioning pin are located at described In the pore of pin hole, the shaft part of the positioning pin is pierced by upwards from the gross porosity of the pin hole, and the spring pocket is in the positioning On the shaft part of pin, one end is supported at the ladder of the pin hole, and the other end is supported at the ladder of the positioning pin；The bias Driver plate bias Floor hinge on the axle bed, oppress on the upper surface of the positioning pin by the circumferential surface of the bias driver plate.

In a further arrangement, wheel orientation adjustment mechanism includes in the shaft at the top of the wheel fork with the wheel The positioning disk rotated, the driving lever being mounted on the side rack are pitched, card slot, the driving lever is distributed on the circumferential surface of the positioning disk With can be located in dialling handle and can stick into or exit the clamp of the card slot on the side rack, the side rack with The spring that the clamp is caught in the card slot when described group of handle and the side rack are detached from is also connected between described group of handle.

By foregoing detailed description, wheel can be carried out the conversion of deflecting roller and directional wheel by the utility model, can be distinguished It adapts to use as travelling aided bicycle and uses steering and orientation to each wheel to require as wheelchair, so that direction of travel is easier Control.

Detailed description of the invention

Fig. 1 is the stereoscopic schematic diagram of travelling aided bicycle；

Fig. 2 is the front view of travelling aided bicycle；

Fig. 3 is the top view of travelling aided bicycle；

Fig. 4 is stereoscopic schematic diagram of the travelling aided bicycle under folding storage state；

Fig. 5 be in Fig. 1 A-A to partial sectional view；

Fig. 6 is the stereoscopic schematic diagram for being transformed into wheelchair；

Fig. 7 is the cross-sectional view of the wheel orientation adjustment mechanism of the first structure；

Fig. 8 is the cross-sectional view of the wheel orientation adjustment mechanism of second of structure；

Cross-sectional view of the Fig. 9 in the wheel orientation adjustment mechanism of the third structure；

Figure 10 is the schematic diagram of the wheel orientation adjustment mechanism of the 4th kind of structure.

Specific embodiment

Fig. 1 to Fig. 3 shows that the structure of travelling aided bicycle, Fig. 1 hollow arrow are row when the present embodiment is used as travelling aided bicycle Into direction.The travelling aided bicycle includes support frame 100, is fixed on helping support part part 200 and be distributed in support frame on support frame 100 The wheel 300 of 100 bottoms further includes seat surface 400, seat surface position adjusting mechanism 500.

Wherein, support frame 100 is by being located at the side rack 110 of arranged on left and right sides and being connected to the side rack of arranged on left and right sides Intermediate connection frame 120 between 110 is constituted.

The side rack 110 of arranged on left and right sides is identical triangular structure, have arch upward forward front support rod 111, to The back support rod 112 that arches upward afterwards and the horizontal positioned beam rail 113 positioned at bottom pass through connector head and the tail phase between three It connects.Side rack 110 makes entire travelling aided bicycle have firm structure using such structure.

Side rack 110 has the intubation 114 being vertically arranged, the front connector 132 of bottom at the upper connector 131 at top Wheel 300 is mounted on the lower section of rear connectors 133.

It helps support part part 200 that there is a pair, respectively symmetrically is fixed on the side rack 110 of arranged on left and right sides.Help support part part 200 Including vertical supporting rod 201 and it is fixed on the fupport arm 202 on 201 top of vertical supporting rod and is connected to the handle in 202 front of fupport arm 203, the front of handle 203 is also equipped with brake lever 204.In the insertion of vertical supporting rod 201 intubation 114.This helps support part part 200 also to wrap Two handrails 205 are included, the rear portion and backward of the upper connector 131 of left side frame side 110A and right side frame side 110B is connected to Fang Yanshen.The shape and angle design of fupport arm 202, handle 203, brake lever 204 and the handrail 205 helped in support part part 200 accord with Ergonomics is closed, has detailed disclosure in the United States Patent (USP) U.S.Pat.No.9 of applicant, 585,807.

Top between the side rack 110 of arranged on left and right sides positioned at intermediate connection frame 120 is additionally provided with seat surface 400, the seat surface 400 are made of soft material, there is high-intensitive cloth to be made, such as the clothes such as terylene, nylon, canvas.In seat surface 400 center is provided with the handle 401 of strip-type, and the effect of the handle is to aid in travelling aided bicycle folding.

As shown in connection with fig. 5, seat surface position adjusting mechanism 500 includes being separately positioned on left side frame side 110A and right side frame side The sliding rail 510 that the front and rear direction of the inside of 110B extends and the sliding block 520 being arranged in sliding rail 510.Sliding rail 510 has section For the sliding slot 511 of T-type, sliding block 520 is strip, is connected to the both sides of the edge of seat surface 400.The section of the sliding block 520 is also T-type, Positioned in sliding slot 511, so that seat surface 400 can be moved forward and backward along sliding rail 510.Side rack 110A and right side frame side The position that sliding rail 510 is correspondingly arranged on the front support rod 111 and back support rod 112 of 110B is respectively fixed with hook 512.The hook 512 upper surfaces have arc-shaped recess 513, and the lower surface of sliding rail 520 then has arc-shaped convex with being adapted to for recess 513 Face, sliding rail 510 are placed in the recess 513 of hook 512.In this way, seat surface position adjusting mechanism 500 can be with arranged on left and right sides Side rack 110 is detached from.As shown in connection with fig. 4, when travelling aided bicycle needs folding storage, handle 401 on seat surface 400 is grasped up Lifting, this strength takes out the sliding rail 510 of 400 two sides of seat surface from the hook 312 on the side rack 110 of arranged on left and right sides is lower, So that seat surface 400 and left side frame side 110A and right side frame side 110B are detached from.

In the present embodiment, sliding rail 510 will have enough length, on the one hand be required to guarantee seat surface 400 to Forward There is sufficient space to take a step for what user unfolded naturally at the dynamic rear for enabling seat surface 400, on the other hand be required to protect Card seat surface 400 moves backward to the position positioned at 205 lower section of handrail.As shown in fig. 6, being helped when seat surface 400 moves backward to be located at When the position of 205 lower section of hand, walking disorder person can be allowed to be sitting in facing rear on seat surface 400, caregiver can then be expert at The rear for the person that walks obstacle holds handle 203 and pushes the travelling aided bicycle, so that travelling aided bicycle also has the function of wheelchair, hollow arrow in figure Show the direction of travel of travelling aided bicycle when using as wheelchair.Handrail 205 can for be sitting in user on seat surface 400 provide it is hand steered Or lean on, in addition support is provided when user stands up.

Intermediate connection frame 120 can be folding stand, can reduce volume when travelling aided bicycle storage to be convenient for carrying and save Parking space.If not considering folding storage, intermediate connection frame 120 also can be made the structure that can not be folded.

Again as depicted in figs. 1 and 2, in the present embodiment, intermediate connection frame 120 is folding stand, by fore-stock 121 and rear branch Frame 122 is in central point hinge at X-shaped structure.Specifically, fore-stock 121 includes preceding stock 1211, preceding quarter butt 1212 and preceding short Arm 1213, after-poppet 122 include rear stock 1221, rear quarter butt 1222 and rear galianconism 1223.Wherein, preceding stock 1211 and rear length Bar 1221 is straight-bar, and preceding quarter butt 1212 and rear quarter butt 1222 are bent stick, and preceding galianconism 1213 and rear galianconism 1223 are triangle Arm.Preceding stock 1211 and rear stock 1221 intersect into X architecture and mutually cut with scissors in the center position of intermediate connection frame 120 Chain.The upper end of preceding stock 1211 is connected on the sliding rail 510 on 400 right side of seat surface, and lower end is connect with the upper end of preceding galianconism 1213, preceding Then hinge is on the beam rail 113 of the side rack 110 in left side for the lower end of galianconism 1213, and preceding 1212 upper end hinge of quarter butt is on right side On the front support rod 111 of side rack 110.The upper end of stock 1221 is connected on the sliding rail 510 in left side afterwards, lower end and rear galianconism 1223 upper end connection, then hinge is on the beam rail 113 of the side rack 110 on right side for the lower end of rear galianconism 1223, rear quarter butt On the front support rod 111 of 1222 upper end hinges and the side rack 110 in left side.Intermediate connection frame 120 uses such foldable structure Be conducive to reduce the folded height of intermediate connection frame 120, so that having smaller volume after travelling aided bicycle folding storage.

The length of sliding rail 510 cooperates the preceding galianconism 1213 and rear galianconism 1223 of 120 lower triangular shape of intermediate connection frame, With the hinged span of beam rail 113 to the side rack 110 of arranged on left and right sides, left and right side frame side keeping parallelism and stabilization are allowed. The rigid design of intermediate 120 connecting rod of connection frame is critically important, it depends on the selection in section, material and size.

Since preceding stock 1211 and rear stock 1221 are directly connected with the sliding rail 510 of 400 two sides of seat surface, when needing to fold When, by lifting the handle 401 among seat surface 400, the hook 512 of the sliding rails 510 of two sides from the side rack 110 of arranged on left and right sides Middle disengaging continues to lift handle 401, due to 1221 phase of preceding stock 1211 and rear stock of sliding rail 510 and intermediate connection frame 120 Even, it necessarily will drive intermediate connection frame 120 to fold.

In conjunction with Fig. 7 and Fig. 8, have at the front connector 132 and rear connectors 133 of 110 bottom of side rack of arranged on left and right sides There is axle bed 400, the lower section of axle bed 400 has wheel fork 410 by the connection of shaft 420, and wheel 300 is then mounted in wheel fork 410, this Sample wheel 300 can carry out 360 ° and be freely rotated.

Axle bed 400, shaft 420, wheel fork 410 and wheel 300 constitute the walking wheel construction of the utility model.

Due to four wheels can be freely rotated so that user in the process of walking, the direction of travel of travelling aided bicycle is bad Control.During traveling, in order to control direction well, relatively good scheme is that front-wheel is deflecting roller, can be free Rotation, so as to guide the direction of travel of travelling aided bicycle, rear-wheel is directional wheel, rolls forward and can only fix and cannot turn to. In this way, as travelling aided bicycle in use, be located at front connector 132 below two wheels be exactly front-wheel, become deflecting roller, energy It is enough freely rotated, does not limit rotation direction, two wheels positioned at 133 lower section of rear connectors are then rear-wheels, become directional wheel, need Limit rotation direction.And as wheelchair in use, be located at rear connectors 133 below two wheels be front-wheel, become turn To wheel, to be freely rotated, do not limit rotation direction；And two wheels for being located at 132 lower section of front connector are rear-wheels, are become Directional wheel needs to limit rotation direction.Therefore, it is necessary to wheel orientation adjustment mechanism 600 is arranged to realize wheel on wheel fork 410 Son is able to carry out the conversion of deflecting roller and directional wheel.

Fig. 7 provides the wheel orientation adjustment mechanism 600 of the first structure.Wheel fork 410 below front connector 132 Dome top surface be equipped with positioning counterbore 601, and be equipped with pin hole 602 on axle bed, positioning pin 603, pin be equipped in pin hole 602 Spring 604 is equipped between hole 602 and positioning pin 603.Pin hole 602 is stepped hole, has superposed pore and is located at lower part Gross porosity, the positioning pin 603 also be hierarchic structure, have superposed shaft part and the pin portion thick positioned at the ratio shaft part of lower part, The shaft part of positioning pin 603 is pierced by from the pore of pin hole 602, and the pin portion of positioning pin 603 is located in the gross porosity of pin hole 602, spring 604 It then covers on the shaft part of positioning pin, one end is supported at the ladder of pin hole 602, and the other end is supported at the ladder of positioning pin 603. The end upper hinge that the shaft part of positioning pin 603 is pierced by from pin hole 602 is resisted against the eccentric driver plate 605 on axle bed in a circumferential surface On, spanner 606 is connected on eccentric driver plate 605.

Above structure may be implemented positioning pin to be extracted or is inserted into determining for 410 top of wheel fork by stirring eccentric driver plate 605 In the counterbore 601 of position, to realize that wheel is converted between deflecting roller and directional wheel.In the wheel fork being located at below front connector 132 There are two positioning counterbores for 410 dome top surface tool, are symmetrically located at the two sides of shaft in the longitudinal direction.

Fig. 8 provides the wheel orientation adjustment mechanism 600 of second of structure.Wheel fork 410 below rear connectors 133 Dome top surface twisted rotary shaft circumferential array have multiple positioning counterbores 601.In addition, shaft 420 is hollow shaft, in wheel fork 410 The top for being internally located at wheel 300 is provided with wheel brake 301, and brake cable 302 is passed through from shaft, and lower end is connect with wheel brake 301, on End is connect across axle bed 400 with brake lever 204.

When the narrow section of eccentric driver plate 605 supports axle bed 400, positioning pin 603 is inserted into position under the action of spring 604 In counterbore 601, limitation wheel fork 410 is rotated；When the length-diameter part of eccentric driver plate 605 supports axle bed 400, positioning pin 603 then can be by Positioning counterbore is extracted, wheel fork 410 is discharged, does not influence the rotation of wheel fork 410.So in this way, realize wheel carry out deflecting roller and The switching of directional wheel.

Fig. 9 provides the wheel orientation adjustment mechanism of the third structure.The pin hole 602 of the mechanism is also stepped hole, but on Portion is gross porosity, and lower part is pore, which is also hierarchic structure, but the shaft part on top is thicker than the pin portion of lower part, positioning pin 603 pin portion is located in the pore of pin hole 602, and the shaft part of positioning pin 603 is pierced by upwards from the gross porosity of pin hole 602, spring 604 Still it covers on the shaft part of positioning pin, one end is supported at the ladder of pin hole 602, and the other end supports the ladder in positioning pin 603 Place.The eccentric Floor hinge of eccentric driver plate 605 on axle bed 400, then oppress in the upper end of positioning pin 603 by the circumferential surface of eccentric driver plate 605 On face.When the narrow section of eccentric driver plate 605 and the upper end face contact of positioning pin 603,604 work of the positioning pin 603 in spring It is popped up under from positioning counterbore 601, does not influence the rotation of wheel fork 410；When the length-diameter part of eccentric driver plate 605 and the upper surface of positioning pin When contact, positioning pin 603 can then be oppressed in insertion positioning counterbore to limit the rotation of wheel fork 410.So in this way, realizing wheel Son carries out the switching of deflecting roller and directional wheel.

The wheel orientation adjustment mechanism 600 of above-mentioned three kinds of structures, by stirring eccentric driver plate 605, when positioning pin 603 is inserted into When in the positioning counterbore 601 on wheel fork 410, the rotation of wheel is limited, wheel becomes directional wheel, when positioning pin 603 is heavy from positioning After hole 601 is extracted, wheel can be freely rotated, and become deflecting roller.

Figure 10 provides the wheel orientation adjustment mechanism of the 4th kind of structure.It is arranged in the shaft 420 at the top of wheel fork 410 There is the positioning disk 610 rotated with wheel fork 410, vertical card slot 611 is evenly distributed on the circumferential surface of the positioning disk 610, in crossbeam Driving lever 620 is then provided on bar 113, the middle part hinge of driving lever 620 has energy on beam rail 113, towards the end of wheel 300 The clamp 621 for enough sticking into card slot 611 is group handle 622 away from the end of wheel 300, and between driving lever 620 and beam rail 113 Be additionally provided with the spring that the clamp 621 of driving lever 520 can be sticked into when not stirring driving lever in the card slot 611 of positioning disk 500 604, the front of one end connection driving lever 620 of spring 604, the other end is fixed on beam rail 113.

By stirring driving lever 620, clamp 621 is detached from the card slot 611 of positioning disk 610, and will be dialled handle 622 and be positioned In beam rail 113, at this moment due to not having the limitation of clamp 621, wheel fork, which is released, to be freely rotated, so that wheel 300 becomes Deflecting roller.It when stirring handle 622, is allowed to be detached from beam rail 131, at this moment clamp 621 under the effect of spring 604, sticks into again In card slot 611, limitation wheel fork 410 is rotated, so that wheel becomes directional wheel.

It should be noted that when, in addition to above-mentioned the utility model disclose 600 structure of wheel orientation adjustment mechanism other than, may be used also Can also be had otherwise using group handle in the eccentric driver plate and Figure 10 in other structures, such as Fig. 7-9, for example, it is vertical Key, horizontal circular driving lever, etc..

But those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate this Utility model, and being not used as the restriction to the utility model, if in the spirit of the utility model, to Variation, the modification of the upper embodiment will all be fallen in the Claims scope of the utility model.

Claims (8)

1. a kind of walking wheel construction of travelling aided bicycle, including support frame and it is distributed in the wheel of support frame as described above bottom, feature Be: support frame as described above bottom is provided with axle bed in the position of installation wheel, and the axle bed is connected with wheel fork by shaft, described Wheel is installed in wheel fork, and wheel orientation adjustment mechanism is additionally provided on the wheel fork.

2. the walking wheel construction of travelling aided bicycle according to claim 1, it is characterised in that: support frame as described above is left and right by being located at Intermediate connection frame between the side rack of two sides and the side rack of connection arranged on left and right sides is constituted.

3. the walking wheel construction of travelling aided bicycle according to claim 2, it is characterised in that: the wheel is distributed in the side The front-end and back-end of frame.

4. the walking wheel construction of travelling aided bicycle according to claim 1, it is characterised in that: wheel orientation adjustment mechanism packet The positioning counterbore set on the wheel fork dome top surface, the pin hole on axle bed, the positioning pin in the pin hole are included, if Spring between pin hole and the positioning pin and the positioning pin is inserted or pull out into the positioning on the axle bed The eccentric driver plate of counterbore.

5. the walking wheel construction of travelling aided bicycle according to claim 4, it is characterised in that: have on the bias driver plate and pull Hand.

6. the walking wheel construction of travelling aided bicycle according to claim 4 or 5, it is characterised in that: the pin hole is stepped hole, tool Have a superposed pore and the gross porosity positioned at lower part, the positioning pin is hierarchic structure, have superposed shaft part and The pin portion thick positioned at the ratio shaft part of lower part, the shaft part of the positioning pin are pierced by from the pore of the pin hole, and the positioning pin is located at The gross porosity of the pin hole, the spring pocket on the shaft part of the positioning pin, support at the ladder of the pin hole, another by one end It supports at the ladder of the positioning pin at end；The upper end of the positioning pin is connected to the eccentric driver plate, the bias driver plate Circumferential surface is resisted against on axle bed.

7. the walking wheel construction of travelling aided bicycle according to claim 4 or 5, it is characterised in that: the pin hole is stepped hole, tool There is the pore of the lower part of the gross porosity on top, the positioning pin is hierarchic structure, and pin portion and top with lower part are than the pin The pin portion of the thick shaft part in portion, the positioning pin is located in the pore of the pin hole, and the shaft part of the positioning pin is from the pin hole It is pierced by upwards in gross porosity, the spring pocket on the shaft part of the positioning pin, support at the ladder of the pin hole, another by one end It supports at the ladder of the positioning pin at end；The bias driver plate bias Floor hinge is on the axle bed, the bias driver plate Circumferential surface is oppressed on the upper surface of the positioning pin.

8. the walking wheel construction of travelling aided bicycle according to claim 2, it is characterised in that: wheel orientation adjustment mechanism packet Include the positioning disk in the shaft being located at the top of the wheel fork with wheel fork rotation, the driving lever being mounted on the side rack, institute It states and card slot is distributed on the circumferential surface of positioning disk, the driving lever has group handle that can be located on the side rack and can block Into or exit the clamp of the card slot, be also connected between the side rack and described group of handle in described group of handle and the side rack The clamp is caught in the spring of the card slot when disengaging.