Piston overtravel indicator
US4207565A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Jun 12, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S33/15
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An overtravel indicator for a piston received in a cylinder having an end wall toward which the piston moves includes an elongated indicator rod slidably mounted through a dielectric bushing in the end wall. A conductive garter spring is compressed between the indicator rod and a groove in the cylinder end wall. An electric circuit including an electrically operated indicator is connected for completion through the indicator rod, end wall and garter spring. In an inward armed position of the indicator rod, dielectric material carried by the rod is interposed between the rod and garter spring for opening the electric circuit. In an outward operated position of the rod, a conductive surface on the rod engages the garter spring to complete the circuit and operate the indicator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.