Shock preventive pneumatic tool as automatically shut off under no load condition
US5533579A · kind A · utility
Inventor
Key dates
| Filing date | Oct 31, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Oct 31, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D17/245
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A pneumatic tool includes: a main cylinder having an operating lever for on-off control for the supply of compressed air into the pneumatic tool, a barrel member resiliently coupled to the main cylinder and having a tool unit secured at its front end portion, and an automatically closed throttle valve held in the main cylinder, whereby upon touching on a working object when starting the pounding job, the barrel member will be retracted to open the throttle valve for performing the pneumatic operation by the pneumatic tool; and when subjected to no load condition, the throttle valve will be restored and closed automatically to temporarily stop the pounding of the pneumatic tool to minimize vibration hazard, and an air cushion is inherently formed between the barrel member and the main cylinder for dampening or absorbing the vibration shock of the pneumatic tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.