Hand-held tool with displaceable spring loaded handle
US5025870A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Nov 20, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D17/043
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A portable hand-held tool, such as a hammer drill or chisel hammer, includes a housing having a main vibration axis and a handle displaceably secured to the housing and movable toward the housing against compression springs. The springs have an axis of compression disposed at an angle to the main vibration axis. When the handle is displaced toward the housing, the spring is compressed. At the same time, however, the increased force of the spring is compensated by the increase in the angle of the spring relative to the main vibration axis. As a result, though the spring force increases, its component acting in the main vibration axis direction is reduced, and the spring force acting in the main vibration axis direction remains constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.