Hand truck stair crawler assembly
US5253881A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 24, 1992 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Aug 24, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62B2301/256
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A hand truck stair crawler assembly having a new and novel stair engaging crawler assembly mounted on a conventional hand truck assembly. The stair engaging crawler assembly includes a pair of spaced, cooperating stair crawler assemblies secured to the hand truck assembly, each having a main roller support assembly with a main roller assembly connected thereto. The main roller support assembly includes a pair of spaced bearing retainer plates secured by a plate connector assembly to the hand truck assembly. The main roller assembly includes a plurality of spaced roller bearings mounted within the bearing retainer plates and having an endless belt member mounted thereon for engagement with stairs for traversing thereof. The roller bearing member is of a special design having a central body portion with outer end belt retaining sections to support the endless belt member having contact and support entirely on a plurality of cooperating roller bearing members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.