Sensor impulse unit
US5531279A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Apr 12, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25F5/008
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An impulse tool (20) having a housing (22), a motor (26), drive mechanism (30), impulse mechanism (28), trigger mechanism (67), and sensor (32) for automatic shut-off is disclosed. The sensor (32) uses a spring-biased ball (144) that sits on a ball seat (149) adjacent an entry orifice (108) and a spring-biased piston (112) such that when a predetermined non-transient torque is reached, the strength, duration and frequency of pulses of the working fluid entering the entry orifice (108) will lift the ball (144) sufficiently to impose on the piston (112) and to progressively lift the piston (112) to allow the working fluid to a triggering height which starts the shut-off of the impulse tool (20). A delay mechanism is also disclosed that may include a regulator (172), dashpot (170), spring latch (204), and trigger bar (56) or latch. A method of cooling an impulse tool with cold, dense air throughout is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.