Wheel frame assembly for quick expansion and folding
US8152179B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 11, 2008 |
| Grant date | Apr 10, 2012 |
| Priority date | — |
| Expiry date | Jul 3, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62B2205/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A wheel frame assembly capable of being folded and expansion rapidly for carrying out and storage easily and conveniently. A wheel frame assembly comprises a retainer frame having two parallel retaining rods; at least two rotary units; each rotary unit being formed by assembling a sleeve with a wheel; an active frame have two parallel active rods; each active rod being penetrated by a guide shaft; a telescopic rod having an inner rod and an outer rod engaged to inner rod; the telescopic rod being connected to a latch for controlling the telescopic movement of the inner rod; the actuation of the latch being performed by a handle. Another, a pin assembly can be used to replaced the telescopic rod. The pin assembly includes a rod unit engaged to the rotary unit and a wire for controlling the rod unit to separate from the rotary unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.