Combination hand truck and stair ramp
US5277436A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1992 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Jun 16, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62B5/0461
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In combination, a hand truck having a unidirectional wheel control ratchet and an adjustable length stair ramp are operable for transporting heavy loads of cargo up flights of stairs. A ratchet wheel and pawl assembly is attached to the wheels of the hand truck to limit the direction of rotation of the wheels to a backward rotation. The stair ramp includes two telescoping U-shaped ramp channels which are spaced so that the wheels of the hand truck can roll within the channels and the ramp further includes upper and lower footing cross members which are pivotally connected to the upper and lower ends of the ramp channels. When the ramp is in place on a flight of stairs the telescoping and pivoting qualities of the ramp allow the channels to rest on the apices of the stair steps. The wheel control ratchets permit a heavily loaded hand truck to be pulled up the stairs along the ramp channels without fear of the hand truck rolling forward and down the ramp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.