Safety system
US4457418A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1981 |
| Grant date | Jul 3, 1984 |
| Priority date | — |
| Expiry date | Nov 19, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16P3/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A safety system for a power stroke machine including: a probe for sensing an obstruction in the work area; means for moving the probe between an extended position to sense obstructions in the work area and a retracted position; means for detecting the probe in the retracted position; means for detecting the probe in the extended position; start switch means for driving the means for moving, to selectively move the probe to the extended and retracted positions; a power output circuit, responsive to the start switch means and the means for detecting the probe in the extended position, for providing a power output to operate a power stroke machine when the start switch means is closed and the probe is in the extended position; a reset circuit for providing a set output in response to either the start switch means being closed or the probe being not retracted; a latching circuit responsive to the set output and the power output, for providing a latch output as long as the set output continues; and an output control circuit responsive to the latch output for transmitting the initially occurring power output and blocking subsequent power outputs until the reset circuit is cancelled in re…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.