Wheel structure with a central control
US7614115B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jul 31, 2007 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | May 19, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60B33/025
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A wheel structure includes a central sleeve, a central controlling shaft joined to the central shaft, a wheel pivoting on an extension portion of the central shaft, and a braking unit; the central controlling shaft includes a controlling piece, and a connecting part for controlling the controlling piece; a position-limiting element is secured in the central sleeve, which is next to the controlling piece, and has a position-limiting hole having the same outline as the controlling piece; the braking unit is arranged in the central sleeve in a movable manner, and biased upwards by springs; the central controlling shaft is operable to change the wheel into first, second, and third configurations; in the first configuration, the wheel can move and turn left and right freely; in the second one, the wheel can only move in a direct course; in the third one, the wheel is immobile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.