WHEEL EXTENDING AND RETRACTING DEVICE FOR DUAL-PURPOSE SHOES

Abstract

The disclosure relates to a wheel extending and retracting device for dual-purpose shoes which includes: a housing and a housing cover. A front end and a rear end of the housing are rotatably connected to a front wheel carrier and a rear wheel carrier respectively, a control assembly is mounted on the housing, and a vertical limit hole is provided in the housing. The control assembly drives a locking movable shaft, and the locking movable shaft is driven by the control assembly so as to vertically move along the vertical limit hole. A retracting snap-in recess and an extending snap-in recess that are configured to snap in the locking movable shaft are provided in the rear wheel carrier. Two sides of the housing are provided with attachment steps that protrude outwards, and an outer side of the attachment step is provided with a linkage frame in an abutted manner.

Claims

1. A wheel extending and retracting device for dual-purpose shoes, comprising: a housing and a housing cover covering the housing, wherein a front end and a rear end of the housing are rotatably connected to a front wheel carrier and a rear wheel carrier respectively, two sides of the housing are provided with attachment steps that protrude outwards, an outer side of the attachment step is provided with a linkage frame in an abutted manner for synchronizing the front wheel carrier and the rear wheel carrier, and the linkage frame is at outer sides of the corresponding front wheel carrier and the corresponding rear wheel carrier.

2. The wheel extending and retracting device for dual-purpose shoes according to claim 1, wherein a vertical limit hole is provided in the housing, a locking movable shaft that is vertically movable is arranged in the vertical limit hole, and a positioning profile for snapping in the locking movable shaft is arranged on the rear wheel carrier.

3. The wheel extending and retracting device for dual-purpose shoes according to claim 2, wherein the positioning profile comprises a retracting snap-in recess and an extending snap-in recess that snap in the locking movable shaft, and the retracting snap-in recess and the extending snap-in recess are both arranged at an outer edge of the rear wheel carrier.

4. The wheel extending and retracting device for dual-purpose shoes according to claim 2, wherein the positioning profile comprises a retracting snap-in hole, an extending snap-in hole and a connecting cambered hole, the retracting snap-in hole and the extending snap-in hole are in communication through the connecting cambered hole, the retracting snap-in hole, the extending snap-in hole and the connecting cambered hole form a closed irregular hole structure, and the locking movable shaft is snapped in the irregular hole.

5. The wheel extending and retracting device for dual-purpose shoes according to claim 2, wherein the vertical limit hole is provided in the attachment step.

6. The wheel extending and retracting device for dual-purpose shoes according to claim 1, wherein one end of the housing cover is snap-fitted on the housing, and the other end of the housing cover is connected to the housing through a bolt.

7. The wheel extending and retracting device for dual-purpose shoes according to claim 1, wherein an accommodation cavity is provided in the housing, a power supply is arranged in the accommodation cavity, the power supply is connected to a light-emitting diode (LED) light source, and a side of the housing is provided with a wiring hole for the power supply.

8. The wheel extending and retracting device for dual-purpose shoes according to claim 1, wherein the front wheel carrier is rotatably mounted at a front end of the housing through a front rotatable fixing shaft, and the rear wheel carrier is rotatably mounted at a rear end of the housing through a rear rotatable fixing shaft; a front end and a rear end of the linkage frame are provided with a transmission front shaft and a transmission rear shaft respectively, the linkage frame is rotatably mounted at the front wheel carrier through a transmission front shaft, and the linkage frame is rotatably mounted at the rear wheel carrier through a transmission rear shaft; and the housing is provided with a first cambered limit hole and a second cambered limit hole for the transmission front shaft and the transmission rear shaft to slide respectively, the first cambered limit hole is below the front rotatable fixing shaft, and the second cambered limit hole is above the rear rotatable fixing shaft.

9. The wheel extending and retracting device for dual-purpose shoes according to claim 8, wherein a centering shaft is arranged in a middle of the housing, and a transverse limit hole for the centering shaft to move is provided in a middle end of the linkage frame.

10. The wheel extending and retracting device for dual-purpose shoes according to claim 8, wherein a tension spring is arranged on the transmission front shaft, the other end of the tension spring is connected to the housing, and a traction direction of the tension spring extends the front wheel carrier around the front rotatable fixing shaft.

11. The wheel extending and retracting device for dual-purpose shoes according to claim 2, wherein a control assembly is mounted on the housing, and the control assembly comprises a trigger rod, a slide block and a slide rail; an inner end of the trigger rod is axially and rotatably snap-fitted on the slide block, the slide rail is arranged in the housing, and the slide block is slidably mounted on the slide rail; and a cambered guide hole for driving the locking movable shaft to vertically move along the vertical limit hole is provided in the slide block, an inner side of the slide block is provided with a reset pressure spring, and the other end of the reset pressure spring abuts against the housing.

12. The wheel extending and retracting device for dual-purpose shoes according to claim 11, wherein a limit recess is provided in the housing, and a limit block is snapped in the limit recess.

13. The wheel extending and retracting device for dual-purpose shoes according to claim 11, wherein the trigger rod is arranged between the housing and the housing cover and extends out of the housing; a minor arc contact surface is arranged on the housing cover, a major arc contact surface is arranged on the limit block, and the minor arc contact surface and the major arc contact surface define a circular structure; and the trigger rod is arranged in the circular structure that is defined by the limit block and the housing cover, and extends out of the housing.

14. The wheel extending and retracting device for dual-purpose shoes according to claim 12, wherein a safety block is arranged on the trigger rod, and a safety opening that corresponds to the safety block is provided in the limit block.

15. The wheel extending and retracting device for dual-purpose shoes according to claim 1, wherein the front wheel carrier and the rear wheel carrier each are of a single-wheel structure.

16. The wheel extending and retracting device for dual-purpose shoes according to claim 1, wherein a position, corresponding to the front rotatable fixing shaft, of the housing is provided with a thickened step that protrudes inwards.

17. The wheel extending and retracting device for dual-purpose shoes according to claim 1, wherein each of the front wheel carrier and the rear wheel carrier comprises a hinge pin, a wheel, a bearing and support plates; the wheel is rotatably mounted on the hinge pin through the bearing, and the support plates are fixedly mounted at two sides of the wheel; and an inner side of the support plate is provided with an anti-loosening step, and the anti-loosening step abuts against an inner race of the bearing.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a schematic structural diagram of a wheel extending and retracting device for dual-purpose shoes according to the disclosure.

[0023] FIG. 2 is a front view of a wheel extending and retracting device for dual-purpose shoes (in an extended state) according to the disclosure.

[0024] FIG. 3 is a front view of a wheel extending and retracting device for dual-purpose shoes (in a retracted state) according to the disclosure.

[0025] FIG. 4 is a top view of a wheel extending and retracting device for dual-purpose shoes according to the disclosure.

[0026] FIG. 5 is a sectional view in a direction A-A of FIG. 4.

[0027] FIG. 6 is an exploded view of a wheel extending and retracting device for dual-purpose shoes according to the disclosure.

[0028] FIG. 7 is an exploded front view of a wheel extending and retracting device for dual-purpose shoes according to the disclosure.

[0029] FIG. 8 is a side view of a wheel extending and retracting device for dual-purpose shoes according to the disclosure.

[0030] FIG. 9 is a schematic structural diagram of a housing of a wheel extending and retracting device for dual-purpose shoes according to the disclosure.

[0031] FIG. 10 is a top view of a housing of a wheel extending and retracting device for dual-purpose shoes according to the disclosure.

[0032] FIG. 11 is a schematic structural diagram of a front wheel carrier or a wheel carrier of a wheel extending and retracting device for dual-purpose shoes according to the disclosure.

[0033] FIG. 12 is a schematic structural diagram of Example 2.

Description of Reference Numerals

[0034] 1. housing; 11. first cambered limit hole; 12. second cambered limit hole; 13. centering shaft; 14. attachment step; 15. thickened step; 2. housing cover; 21. bolt; 3. front wheel carrier; 31. front rotatable fixing shaft; 4. rear wheel carrier; 41. rear rotatable fixing shaft; 42. positioning profile; 421. retracting snap-in recess; 422. extending snap-in recess; 423. retracting snap-in hole; 424. extending snap-in hole; 425. connecting cambered hole; [0035] 5. control assembly; 51. trigger rod; 511. safety block; 512. safety opening; 52. slide block; 521. cambered guide hole; 53. slide rail; 54. reset pressure spring; 55. limit recess; 56. limit block; 561. major arc contact surface; 562. minor arc contact surface; [0036] 61. vertical limit hole; 62. locking movable shaft; [0037] 7. linkage frame; 71. transmission front shaft; 711. tension spring; 72. transmission rear shaft; 73. transverse limit hole; [0038] 81. accommodation cavity; 82. power supply; 83. wiring hole; [0039] 91. hinge pin; 92. wheel; 93. bearing; 94. support plate; and 95. anti-loosening step.

DETAILED DESCRIPTION OF THE INVENTION

[0040] The disclosure will be further described below with reference to accompanying drawings:

Example 1

[0041] As shown in FIGS. 1-11, this example provides a wheel extending and retracting device for dual-purpose shoes. The wheel extending and retracting device for dual-purpose shoes includes a housing 1, a housing cover 2, a front wheel carrier 3, a rear wheel carrier 4, a control assembly 5 and a linkage frame 7.

[0042] In this example, the housing cover 2 covers the housing 1. Specifically, one end of the housing cover 2 is snap-fitted on the housing 1, and the other end of the housing cover 2 is connected to the housing 1 through a bolt 21.

[0043] In this example, an accommodation cavity 81 is provided in the housing 1, a power supply 82 is arranged in the accommodation cavity 81, the power supply 82 is connected to a light-emitting diode (LED) light source, and a side of the housing 1 is provided with a wiring hole 83 for the power supply 82. Two sides of the housing 1 are provided with attachment steps 14 that protrude outwards, an outer side of the attachment step 14 is provided with the linkage frame 7 in an abutted manner, and a front end and a rear end of the linkage frame 7 are rotatably mounted on the front wheel carrier 3 and the rear wheel carrier 4 respectively. The linkage frame 7 is arranged outside the housing 1, such that an internal space of the housing 1 is reduced, a wall of the housing 1 can be thicker, and a service life of the product is prolonged. The attachment step 14 is arranged for the linkage frame 7 to abut against, thus improving stability of the linkage frame 7 during working.

[0044] In this example, a front end and a rear end of the housing 1 are rotatably connected to the front wheel carrier 3 and the rear wheel carrier 4 respectively. Each of the front wheel carrier 3 and the rear wheel carrier 4 includes a hinge pin 91, a wheel 92, a bearing 93 and support plates 94, the wheel 92 is rotatably mounted on the hinge pin 91 through the bearing 93, the support plates 94 are fixedly mounted at two sides of the wheel 92, and an inner side of the support plate 94 is provided with an anti-loosening step 95, and the anti-loosening step 95 abuts against an inner race of the bearing 93. The anti-loosening step 95 is arranged to prevent the wheel 92 from swinging from side to side during sliding. The front wheel carrier 3 and the rear wheel carrier 4 each are of a single-wheel structure. Compared with a traditional double-row wheel structure, the single-wheel structure is lighter in weight. In addition, in order to improve the stability, inclination angles (angles between a wheel carrier and the ground) of the front wheel carrier 3 and the rear wheel carrier 4 become smaller ranging from 30to 60. The inclination angle in this example is 45. The single-wheel structure with the small inclination angle leads to a greater wheel track between the front wheel carrier 3 and the rear wheel carrier 4, and the sliding stability is better.

[0045] In this example, the control assembly 5 is mounted on the housing 1, a vertical limit hole 61 is provided in the housing 1, and the vertical limit hole 61 is provided in the attachment step 14. The control assembly 5 drives a locking movable shaft 62, and the locking movable shaft 62 is driven by the control assembly 5 so as to vertically move along the vertical limit hole 61. A retracting snap-in recess 421 and an extending snap-in recess 422 that are configured to snap in the locking movable shaft 62 are provided in the rear wheel carrier 4, and the control assembly 5 includes a trigger rod 51, a slide block 52 and a slide rail 53. An inner end of the trigger rod 51 is axially rotatably snap-fitted on the slide block 52, the slide rail 53 is arranged in the housing 1, and the slide block 52 is slidably mounted on the slide rail 53. A cambered guide hole 521 for driving the locking movable shaft 62 to vertically move is provided in the slide block 52, an inner side of the slide block 52 is provided with a reset pressure spring 54, and the other end of the reset pressure spring 54 abuts against the housing 1. A limit recess 55 is provided in the housing 1, and a limit block 56 is snapped in the limit recess 55. In use, the trigger rod 51 is forwards pushed to drive the slide block 52 to slide forwards. Under the action of the cambered guide hole 521, the locking movable shaft 62 moves upwards, and the reset spring pushes the slide block 52 to reset and drives the locking movable shaft 62 to move downwards. Then the locking movable shaft 62 vertically moves, and the locking movable shaft 62 is snapped in the retracting snap-in recess 421 or the extending snap-in recess 422, so as to fix the rear wheel carrier 4 and prevent the rear wheel carrier from unexpected extending or retracting during use.

[0046] In this example, the front wheel carrier 3 is rotatably mounted at a front end of the housing 1 through a front rotatable fixing shaft 31, and the rear wheel carrier 4 is rotatably mounted at a rear end of the housing 1 through a rear rotatable fixing shaft 41. A position, corresponding to the front rotatable fixing shaft 31, of the housing 1 is provided with a thickened step 15 that protrudes inwards. A front end and a rear end of the linkage frame 7 are provided with a transmission front shaft 71 and a transmission rear shaft 72 respectively, the housing 1 is provided with a first cambered limit hole 11 and a second cambered limit hole 12 for the transmission front shaft 71 and the transmission rear shaft 72 to move respectively, the first cambered limit hole 11 is below the front rotatable fixing shaft 31, and the second cambered limit hole 12 is above the rear rotatable fixing shaft 41. A centering shaft 13 is arranged in a middle of the housing 1, and a transverse limit hole 73 for the centering shaft 13 to move is provided in a middle end of the linkage frame 7. A tension spring 711 is arranged on the transmission front shaft 71, and the other end of the tension spring 711 is connected to the housing 1. Under the action of the tension spring 711, the front wheel carrier 3 always tends to extend, and under the action of the linkage frame 7, the rear wheel carrier 4 extends synchronously. By arranging the centering shaft 13 and the transverse limit hole 73, the stability of the linkage frame 7 is improved.

[0047] In this example, the trigger rod 51 is arranged between the housing 1 and the housing cover 2 and extends out of the housing 1. A minor arc contact surface 562 is arranged on the housing cover 2, a major arc contact surface 561 is arranged on the limit block 56, and the minor arc contact surface 562 and the major arc contact surface 561 define a circular structure. The trigger rod 51 is arranged in the circular structure that is defined by the limit block 56 and the housing cover 2, and extends out of the housing 1. A safety block 511 is arranged on the trigger rod 51, and a safety opening 512 that corresponds to the safety block 511 is provided in the limit block 56 or the housing 1. For the convenience of assembly, the detachable limit block 56 is provided, and the major arc contact surface 561 is further provided to limit vertical movement of the trigger rod 51, thus further improving the stability of the control assembly 5. The safety block 511 and the safety opening 512 are provided, and the trigger rod 51 can be pushed in merely when the safety block 511 is aligned with the safety opening 512, thus preventing the trigger rod 51 from being touched by mistake.

Example 2

[0048] As shown in FIG. 12, this example provides a wheel extending and retracting device for dual-purpose shoes. This example is different from Example 1 in that a positioning profile 42 includes a retracting snap-in hole 423, an extending snap-in hole 424 and a connecting cambered hole 425, the retracting snap-in hole 423 and the extending snap-in hole 424 are in communication through the connecting cambered hole 425. The retracting snap-in hole 423, the extending snap-in hole 424 and the connecting cambered hole 425 form a closed irregular hole structure, and a locking movable shaft 62 is snapped in the irregular hole.

[0049] A working process in the example is as follows:

[0050] An extending process: a trigger rod 51 is rotated to a position where a safety block 511 faces a safety hole, and the trigger rod 51 is pressed forwards to make the locking movable shaft 62 lift upwards and get separated from the retracting snap-in recess 421. Under the action of pulling force of a tension spring 711, a front wheel carrier 3 is extended, and under the action of a linkage frame 7, a rear wheel carrier 4 is extended synchronously. After the wheel carriers extend in place, a centering shaft 13 moves to a rear end of a transverse limit hole 73, and the locking movable shaft 62 is snapped in an extending snap-in recess 422. Under the action of a reset spring, a slide block 52 is reset to limit the locking movable shaft 62 in the extending snap-in recess 422, so as to maintain an extended state.

[0051] A retracting process: the trigger rod 51 is rotated to a position where the safety block 511 faces the safety hole, and the trigger rod 51 is pressed forwards to make the locking movable shaft 62 lift upwards and get separated from the extending snap-in recess 422. Then, external force makes the rear wheel carrier 4 swing forwards or the front wheel carrier 3 swing backwards. Due to the action of the linkage frame 7, the front wheel carrier 3 and the rear wheel carrier 4 are to be retracted synchronously and oppositely, and the tension spring 711 is extended. After the front wheel carrier 3 and the rear wheel carrier 4 are completely retracted in place, the locking movable shaft 62 is exactly snapped in the retracting snap-in recess 421, the centering shaft 13 moves to a front end of the transverse limit hole 73, and the slide block 52 is reset to limit the locking movable shaft 62 in the retracting snap-in hole 423 under the action of the return spring, so as to maintain a retracted state.

[0052] The basic principles, main features and inventive advantages of the disclosure have been shown and described in the examples above. Those skilled in the art should understand that the disclosure is not limited by the examples described above, what are described in the examples and the description are merely used for explaining the principles of the disclosure, various changes and improvements can be made to the disclosure without deviating from the inventive spirits and the scope of the disclosure, and these changes and improvements should fall within the protection scope claimed by the disclosure. The protection scope claimed by the disclosure is defined by the claims appended and their equivalents.