Shielded position sensor for translationally moving parts
US7852067B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 2007 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Aug 3, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2515
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor is disclosed for monitoring a part which can move translationally relative to a sensor with reference to its position on the axis of motion. This part is for example a piston in a cylinder which is equipped with a sensor. The sensor can be actuated by means of a magnet which is oriented in the direction of motion with respect to the north and south pole and which is located on the movable part. The sensor has three reed contacts which are aligned in parallel and of which the first and the second reed contact are located in one plane and parallel next to one another with their lengthwise axes, by which they can be actuated almost at the same time by the magnetic field of the magnet which is located on the movable part. The third reed contact is located at a distance to the plane of the first and the second reed contact. This sensor with the first two reed contacts is mounted facing the actuating magnet. This arrangement has the advantage that an external magnetic field always actuated the third reed contact as well, if it can actuate the first two reed contacts. Then the sensor indicates an error report or an unsafe position, but never a safe position of the movable part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.