Dial-type timer device
US5400302A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1994 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Jun 21, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F3/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A dial-type timer device having a timer body and a dial on a face of the timer body. A cover, including a locking pawl, is placed on the face of the timer body so that the dial protrudes through a hole therein. A setting ring is mounted on the dial and engages the locking pawl at a selected location to repeatedly set the time. Alternatively, two setting rings, each including a tooth on its outer periphery, are mounted on the dial to limit the range of rotation of the dial. Also, in a timing circuit of the timer, a dummy resistor of substantially the same impedance as an output relay, with its own switching element is connected in series with the output relay. By switching current alternatively through the output relay and the dummy resistor, fluctuation of current in the circuit is minimized and stable power is supplied to the time-limit circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.