WO2011011904A1

WO2011011904A1 - Folding device for castor

Info

Publication number: WO2011011904A1
Application number: PCT/CN2009/000932
Authority: WO
Inventors: 简世坤
Original assignee: Jian Shikun
Priority date: 2009-07-31
Filing date: 2009-08-14
Publication date: 2011-02-03
Also published as: CN201427494Y

Abstract

A folding device for a castor includes a castor carrier (1), a carrier axle (2) and mounting frames (3,4). The upper end of the castor carrier (1) is a carrier sleeve (11), and the lower end is connected with a castor (16). The carrier axle (2) is sleeved in the carrier sleeve (11), and both ends thereof are supported on the mounting frames (3,4). The folding device also includes a locating sleeve (5) and a compression spring (6). The locating sleeve (5) is placed around the carrier axle (2). The opposite ends of the carrier sleeve (11) and the locating sleeve (5) are respectively distributed with projections (11a) and recesses (5b) which are evenly spaced in circumference, and the projections (11a) couple with the recesses (5b) each other. The other end of the locating sleeve (5) is arranged coaxially with the compression spring (6). One end of the compression spring (6) is fixed on the locating sleeve (5), and the other end is fixed on the carrier axle (2). With the folding device, each castor can be located and controlled separately. Furthermore, the folding device for the castor has simple structure, and can be opened to locate correctly and stably, and is convenient to fold.

Description

Caster folding device

The utility model relates to a caster folding device for a baggage car and the like, in particular to a caster folding device which can be closed when used and can be closed when not in use.

technical background

At airports, terminals, stations or warehouses, when people need to move heavier baggage or items, most of them use flatbeds, which is more labor-saving and convenient. The Chinese patent 200710146724.7 filed by the present application discloses a retractable caster flatbed and a caster positioning device which are convenient for folding and can carry heavy articles. The structure comprises a bearing plate, a push-pull part and a caster. The ends of the two poles of the push-pull part are pivotally connected with a carrier, and the caster sleeve of the upper part of the caster is set on the carrier, and the caster is opened and folded between the caster sleeve and the pole. Device. The caster positioning device comprises a left and right locking device for locking the caster sleeve on the arms on both sides of the carrier and the two levers, and a sliding crossbar for interlocking with the left and right locking devices. The caster of the flatbed can be linked with the push-pull part, and the push-pull part can be folded up to the load-bearing plate, and the caster can be automatically folded for storage and transportation. However, the structure of such a caster device is unreasonable, and only the rear wheel is positioned, so that the push-pull portion is swayed back and forth with respect to the carrier. In addition, its structure is also complicated and costly.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a caster folding device which is simple in structure, reliable in positioning, and can be independently applied in various occasions.

The technical proposal of the utility model is: a caster folding device, comprising a caster frame, a wheel frame shaft and a mounting frame; the upper end of the caster frame is a wheel frame cover, and the lower end is connected with the caster; the wheel frame shaft is set on the wheel

1

Confirmation The sleeve sleeve is supported on the mounting bracket; the caster folding device further comprises a positioning sleeve and a compression spring, the positioning sleeve is set on the wheel frame shaft, and the end of the wheel carrier sleeve and the positioning sleeve is opposite to the end The portions are respectively provided with convex teeth and grooves uniformly distributed in the circumference, the convex teeth and the grooves are engaged with each other; the compression spring is coaxially disposed at the other end of the positioning sleeve, one end of the compression spring is positioned on the positioning sleeve, and the other end is positioned at On the wheel axle.

As a further improvement of the present invention, the outer side wall of the positioning sleeve is provided with a handle. The handle can be arranged either unilaterally or symmetrically, for pulling the axial movement of the positioning sleeve, thereby releasing the mutual engagement between the convex teeth and the groove, and rotating the folding caster frame.

As a further improvement of the present invention, the position of the corresponding positioning sleeve on the wheel frame shaft is provided with an elongated through hole, and the through hole is internally provided with a guiding pin, and both ends of the guiding pin are fixed on the limiting sleeve on. Due to the guiding action of the guide pin, the positioning sleeve is prevented from rotating around the wheel frame shaft. Therefore, the positioning sleeve can be accurately reset under the action of the compression spring, which facilitates accurate engagement between the convex tooth and the groove.

The wheel frame shaft is a hollow tube, and the compression spring is coaxially disposed in the wheel frame shaft. One end of the compression spring is placed on the guide pin, and the other end is placed on the end cover connected to the wheel frame shaft.

The convex teeth or grooves are an even number on the circumference. The convex teeth or grooves are four or more.

As a further improvement of the present invention, the wheel carrier sleeve is provided with a first through groove in the radial direction, and the wheel frame shaft is provided with a torsion spring, one end of the torsion spring is positioned on the wheel frame cover, and the other end is extended Outside the slot. When the caster frame is opened, the torsion spring is in a free state; when the engagement between the convex tooth and the groove is released, after pushing the caster frame to rotate around the frame of the wheel carrier, the handle is released, and the carrier sleeve of the positioning sleeve and the caster frame is released. Re-locking, at this time the torsion spring is in a torsional state. When the caster frame needs to be opened, the handle is pulled, and the caster frame is automatically opened to the initial position by the torsion spring.

The wheel carrier sleeve is further provided with a second through groove parallel to the first through groove, the wheel frame shaft A position corresponding to the second through groove is provided with a limit pin, and the second through groove defines an angle at which the caster frame rotates around the wheel frame. The second through groove includes two and symmetrically distributed on both sides of the first through groove, and the second through groove has a circumferential length greater than or equal to a quarter circumference.

A positioning sleeve is disposed between the wheel frame shaft and the wheel carrier sleeve, and the positioning sleeve is fixedly connected to the wheel shaft through the limiting pin. This can reduce the friction between the wheel frame shaft and the wheel carrier cover, which is beneficial to the folding and opening of the wheel carrier.

In summary, compared with the prior art, the utility model has the beneficial effects that each caster can be separately positioned and independently controlled, thereby avoiding the shaking caused by the front wheel not being able to be positioned when used on a flatbed. In addition, the entire caster folding device has a simple structure, accurate and reliable opening, and the folding is simple and convenient, and is convenient for consumers to use.

DRAWINGS

Figure 1 is a perspective view of a caster folding device;

Figure 2 is an exploded view of Figure 1;

Figure 3 is a perspective view, partly in section, of Figure 1;

Figure 4 is a perspective view of the caster after the pinch of Figure 1 is folded;

Figure 5 is a schematic view of the caster folding device of the present invention applied to a four-wheel flatbed. detailed description

The caster folding device of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in FIGS. 1 to 3, the caster folding device of this embodiment includes a caster frame 1, a wheel frame shaft 2, and front and rear mounting frames 3, 4, a positioning sleeve 5, and a compression spring 6. The upper end of the caster frame 1 is a wheel carrier cover 11, and the lower end is connected to the caster 16, and both ends of the wheel carrier shaft 2 are supported on the front and rear mounting frames 3, 4. When in use, the front and rear mounting brackets 3, 4 can be fixed to the bottom of the four-wheeled flatbed (as shown in Figure 5). The positioning sleeve 5 and the wheel carrier sleeve 11 are set on the wheel frame shaft 2, and the wheel carrier sleeve 11 is fixed The ends of the sleeve 5 opposite to one end are respectively provided with convex teeth 11a and grooves 5a which are uniformly distributed in the circumference, and the convex teeth 11a or the grooves 5a are selected to have an even number on the circumference, preferably four or more, and convex The teeth 11a and the grooves 11a are engaged with each other. An elongated through hole 2a is formed in the position of the wheel frame shaft 2 corresponding to the positioning sleeve 5, and a guide pin 7 is inserted into the through hole 2a. The guide pin 7 can be a square nut, and both ends thereof pass the screw. 8 is fixed on the limit sleeve 5. Therefore, the limiting sleeve 5 can only reciprocate axially along the elongated through hole 2a under the guiding action of the guiding pin 7, and the guiding pin 7 also prevents the limiting sleeve 5 from rotating around the carrier shaft 2, thereby The wheel housing 11 is locked by the recess 5a of the end face of the limiting sleeve 5. Therefore, the distance between the front and rear mounting brackets 3, 4 is slightly larger than the sum of the axial lengths of the carrier sleeve 11 and the positioning sleeve 5, so that the positioning sleeve 5 is moved in the axial direction.

The wheel frame shaft 2 is a hollow tube, and two ends of the wheel frame shaft 2 are respectively provided with end caps 9, and the front end cover 9 is directly inserted into the wheel frame shaft 2 from the outside of the front mounting frame 3. The rear end cover 9 is provided with lugs 9a on both sides thereof, and is fixed to the rear mounting frame 4 by screws 10 through mounting holes 9b provided in the lugs 9a. The compression spring 6 is coaxially disposed within the wheel carrier shaft 2, one end of which is mounted on the guide pin 7 and the other end is placed on the rear end cover 9. In addition, a handle 5b is disposed on the outer side wall of the positioning sleeve 5, and the handle 5b may be symmetrically disposed on both sides of the positioning sleeve 5, or may be disposed only on one side, and the shape thereof is not limited to the shape shown in FIG. It is convenient to pull the positioning sleeve 5 to move axially. The positioning sleeve 5 is axially pulled by the handle 5b, thereby releasing the mutual engagement between the protruding teeth 11a and the recess 5a, that is, the folding caster frame 1, as shown in Fig. 4.

In order to facilitate the opening of the caster frame 1 from the collapsed state as shown in FIG. 4 to the open state as shown in FIG. 1, a first through groove l ib is provided on the carrier sleeve 11 in the radial direction, and the carrier shaft 2 is provided. The upper sleeve is provided with a torsion spring 12, one end of the torsion spring 12 is positioned on the wheel carrier sleeve 11, and the other end is extended from the through slot lb. In FIG. 1, the torsion spring 12 is in a free state; when the engagement between the protruding teeth 11a and the recess 5a is released, after the pusher frame 1 is rotated and folded around the carrier shaft 2, the positioning sleeve 5 is The carriage cover 11 of the caster frame 1 is re-locked, as shown in Fig. 4, at which time the torsion spring 12 is in a torsional stress state. When it is necessary to open the caster frame 1 to the state shown in Fig. 1, the handle 5b is pulled, and the caster frame 1 is automatically opened by the torsion spring 12.

In addition, two second through slots l lc parallel to the two first through slots l ib are disposed on the wheel carrier sleeve 11 , and the two second through slots 11 c are symmetrically disposed on the first through slots l ib On both sides, a position limiting pin 13 is respectively disposed on the wheel frame shaft 2 corresponding to the two second through grooves 11c, and the limiting pin 13 is fixed on the wheel frame shaft 2 through two mounting holes 2b on the wheel frame shaft 2, The end portion is inserted into the corresponding second through groove 11c; the second through groove 11c is for defining an angle at which the caster frame 1 rotates around the carrier shaft 2. In order to ensure that the caster frame 1 takes up a minimum space after being folded, the circumferential length of the second through groove 11c is preferably greater than or equal to a quarter of a circumference.

In order to reduce the friction between the wheel frame shaft 2 and the wheel carrier sleeve 11, a positioning sleeve 14 and a sleeve 15 are fitted between the wheel carrier shaft 2 and the wheel carrier sleeve 11, and the positioning sleeve 14 passes through one of the limiting pins 13 and the wheel. The frame shaft 2 is fixedly connected. The sleeve 15 is fitted to the front end of the wheel frame shaft 2, and as shown in Fig. 3, the shoulder 15a at the end of the sleeve 15 is sandwiched between the front mounting frame 3 and the front end surface of the wheel carrier cover 11. The two components function mainly to reduce the friction between the wheel frame shaft 2 and the wheel carrier cover 11, to extend the service life of the wheel frame shaft 2 and the wheel carrier cover 11, and to facilitate the folding and opening of the wheel carrier 1.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Therefore, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in Within the scope of the claims of the present invention.

Claims

Claim

A caster folding device, comprising a caster frame, a wheel frame shaft and a mounting frame, wherein the upper end of the wheel carrier is a wheel carrier sleeve, and the lower end is connected with the caster; the wheel frame shaft is set in the wheel carrier sleeve, and the two ends are supported at the installation The scaffolding device further comprises a positioning sleeve and a compression spring, wherein the positioning sleeve is sleeved on the wheel frame shaft, and the end portions of the wheel holder sleeve and the opposite end of the positioning sleeve are respectively provided with convexities with circumferential hooks. The teeth and the grooves, the convex teeth and the grooves are engaged with each other; the compression spring is coaxially disposed at the other end of the positioning sleeve, one end of the compression spring is positioned on the positioning sleeve, and the other end is positioned on the wheel frame shaft.

2. The caster folding device according to claim 1, wherein: the outer side wall of the positioning sleeve is provided with a handle.

3. The caster folding device according to claim 2, wherein: a position of the corresponding positioning sleeve on the wheel frame shaft is provided with an elongated through hole, and the through hole is internally provided with a guiding pin for guiding Both ends of the pin are fixed on the limit sleeve.

4. The caster folding device according to claim 3, wherein: the wheel frame shaft is a hollow tube, and the compression spring is coaxially disposed in the wheel frame shaft, and one end of the compression spring is placed on the guide pin. The other end is placed on the end cap that is coupled to the axle of the wheel carrier.

The caster folding device according to any one of claims 1 to 4, characterized in that the convex teeth or grooves are an even number on the circumference.

The caster folding device according to claim 5, wherein the convex teeth or the grooves are four or more.

The caster folding device according to any one of claims 1 to 4, wherein: the wheel carrier sleeve is provided with a first through groove in a radial direction, and the wheel frame shaft is provided with a torsion spring, and is twisted One end of the spring is positioned on the wheel carrier sleeve and the other end is extended outside the channel.

8. The caster folding device according to claim 7, wherein: the wheel cover a second through slot parallel to the first through slot is further disposed, and the position of the wheel frame corresponding to the second through slot is provided with a limiting pin, and the second through slot defines the caster frame to rotate around the axle of the wheel carrier Angle.

The caster folding device according to claim 8, wherein: the second through slot comprises two and is symmetrically distributed on two sides of the first through slot, and the circumferential length of the second through slot is greater than or equal to A quarter of the circumference.

10. The caster folding device according to claim 8, wherein a positioning sleeve is disposed between the wheel frame shaft and the wheel carrier sleeve, and the positioning sleeve is fixedly coupled to the wheel frame shaft by a limiting pin.