초록 ▼

A wheel assembly has a swiveling shaft, a support member movably assembled with the swiveling shaft, an arresting member and wheels. The swiveling shaft includes a swiveling sleeve, a pressing element disposed on the swiveling sleeve, and a first gear bracket and a second gear bracket. The support m

A wheel assembly has a swiveling shaft, a support member movably assembled with the swiveling shaft, an arresting member and wheels. The swiveling shaft includes a swiveling sleeve, a pressing element disposed on the swiveling sleeve, and a first gear bracket and a second gear bracket. The support member includes a rack with an opening, and a third gear bracket snapped in the opening, The arresting member is mounted on the rack. A first resilient element is provided between the arresting member and the rack. A second resilient element is provided between the arresting member and the third gear bracket. The wheels respectively pivot to the rack, and are limited at opposite sides of the arresting member. The pressing element limits rotation of the wheels, preventing deformation of the wheels thereby effectively stopping the wheels and lengthening lives of the wheels.

대표청구항 ▼

What is claimed is: 1. A wheel assembly comprising: a swiveling shaft at least including a swiveling sleeve, a pressing element disposed on the swiveling sleeve, and a first gear bracket and a second gear bracket located on an end of the pressing element; a support member movably assembled with the

What is claimed is: 1. A wheel assembly comprising: a swiveling shaft at least including a swiveling sleeve, a pressing element disposed on the swiveling sleeve, and a first gear bracket and a second gear bracket located on an end of the pressing element; a support member movably assembled with the swiveling shaft, and at least including a rack with an opening, and a third gear bracket snapped in the opening, protuberances extending inwardly from opposing side walls of the opening; an arresting member mounted on the rack, a first resilient element being provided between the arresting member and the rack, an end of the arresting member corresponding to the pressing element and the third gear bracket, a second resilient element being provided between the arresting member and the third gear bracket; and wheels respectively pivoting to the rack and being limited at opposite sides of the arresting member, each wheel defining an annular groove in a surface thereof for corresponding to the arresting member. 2. The wheel assembly as claimed in claim 1, wherein the swiveling sleeve has a first casing and a second casing, through holes being formed respectively defined in the first casing and the second casing and correspond to each other for allowing a rotating level to extend therethrough and actuate the pressing element. 3. The wheel assembly as claimed in claim 1, wherein the pressing element comprises an axle sleeve, a pushing portion partly extending into the axle sleeve, a rotating portion abutting an end of the pushing portion, an axle pole disposed in the swiveling sleeve and abutting another end of the pushing portion, and a resilient portion between the pushing portion and the axle pole. 4. The wheel assembly as claimed in claim 3, wherein a first recess, a second recess and a projection are respectively formed at an outward rim of the rotating portion for cooperating with the pushing portion. 5. The wheel assembly as claimed in claim 3, wherein slits are defined in an outward rim of the first gear bracket. 6. The wheel assembly as claimed in claim 3, wherein indented portions are distributed on an outward rim of the second gear bracket. 7. The wheel assembly as claimed in claim 1, wherein a bearing is provided at an end of the rack for movably connecting with the swiveling shaft. 8. The wheel assembly as claimed in claim 1, wherein the third gear bracket includes a transverse plate and extension plates respectively on opposite sides of the transverse plate, a slot being defined in the transverse plate, tooth-like portions being formed on inner rims of the transverse plate, locking cutouts being respectively defined in the extension plates for locking with the sides walls of the opening. 9. The wheel assembly as claimed in claim 8, wherein the extension plates are slightly higher than the transverse plate, defining an offset between the extension plates and the transverse plate. 10. The wheel assembly as claimed in claim 1, wherein the arresting member at least comprises a pair of arresting blocks, each arresting block forming an arcuate interferential portion on an end thereof for corresponding to the annular grooves of the wheels. 11. The wheel assembly as claimed in claim 1, wherein central shafts are provided on the wheels respectively for pivoting the wheels to the rack.