Magnetic control apparatus
US4267544A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Nov 8, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Magnetic control apparatus (32) for intensifying a magnetic field to actuate a magnetic control member (34) and for preventing simultaneous actuation of a pair (34, 36) of magnetic control members. In one (32) of several embodiments a pair (38, 40) of selectively movable magnets each respectively produces a magnetic field which, when a magnet is moved into position, is directed by a pair (42, 54) of elongated bars across the pair (34, 36) of control members to actuate one of the members in response to the field. The pair (42, 54) of bars bypass the magnetic fields from the control members (34, 36) when both magnets (38, 40) are in such a position to attempt to actuate the control members (34, 36). The pair (42, 54) of elongated bars intensify the magnetic fields at the control members (34, 36), thereby permitting the use of relatively weak magnets at a substantial distance from the members (34, 36). The pair (42, 54) of bars also provide a magnetic interlock, preventing undesirable simultaneous actuation of the members (34, 36). The apparatus (32) can be used on a pedal (100) of a fork lift truck to actuate one member (34) to shift a transmission into forward drive and to actuate t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.