Hand truck stair tread engaging device
US4290618A · kind A · utility
6Cited by
5References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 16, 1979 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Apr 16, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62B2301/256
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a conventional hand truck, a stair tread engaging device having reduced friction and improved mobility provided by a plurality of rollers each rotating freely in its own socket and only on its own axis without forward movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.