Contact-controlled capacitive switching apparatus
US4441034A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 1982 |
| Grant date | Apr 3, 1984 |
| Priority date | — |
| Expiry date | Nov 16, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/962
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A contact-controlled capacitive switching means utilized as a floor or cabin calling transmitter for lifts or the like is designed such that travel or drive commands for the lift are prevented from being generated by the action of heat or, if generated, from being further transmitted to a lift control system. Therefore, a thermal circuit breaker is interconnected between an actuating element, such as a contact button and a coupling member connected to an input of an oscillator. The thermal circuit breaker may be mounted directly at the contact button or at a mounting plate carrying the contact button. A further thermal circuit breaker is interconnected between an output of the switching means and a connection terminal of a signal transmitting line of the lift control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.