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.

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.