Nail driving impact hammer
US4316513A · kind A · utility
20Cited by
6References
1Claims
0Family size
Inventor
Key dates
| Filing date | Feb 4, 1980 |
| Grant date | Feb 23, 1982 |
| Priority date | — |
| Expiry date | Feb 4, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21F9/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A reciprocating ram or hammer is disclosed for driving flat nails in mines without danger of creating sparks that might ignite inflammable gases that would cause an explosion. The hammer comprises a cylindrical tube in which a ram is reciprocated to strike an anvil or drive pin which pushes against a flat nail by overcoming the resistance of a helical spring in the tube. As the nail is being driven, it is held at the end of the hammer by a permanent magnet. Such flat nails are commonly driven overhead for suspending lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.