Visual position indicator
US5957158A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1998 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | May 11, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8275
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A position indication for an actuator of a rotary valve has a rotor of one color mountable on the shaft of the actuator and a stator of contrasting color, each with a plurality of volutes in one-to-one correspondence. The rotor volutes are hidden behind corresponding stator volutes to indicate a closed disposition and extend beyond their corresponding stator volutes to indicate an open disposition of the valve actuator when viewed from a radial direction. Web members on the rotor are rotated into and out of registration with windows in the base and cover of the stator for indicating valve disposition from above. The rotor and stator are congruent to permit the indicator to be inverted depending on the direction of rotation of the valve actuator shaft during opening and closing of the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.