Measuring apparatus
US4570348A · kind A · utility
Inventors
Key dates
| Filing date | Sep 24, 1984 |
| Grant date | Feb 18, 1986 |
| Priority date | — |
| Expiry date | Sep 24, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B5/043
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus for measuring length of an elongate cable. A frame having a hole therethrough includes a pair of rollers mounted for rotation thereon. The circumferences of the rollers are rollingly engaged with one another over the hole and a cable which is to be measured is held between the rollers and passed downwardly through the hole thereby rotating the rollers. A magnet is mounted on one of the rollers adjacent the circumference thereof. Mounted on the frame adjacent the circumference of the roller having the magnet mounted thereon is a magnetically-activated switch which closes each time the magnet passes thereby. The switch provides an input to a transmitter which generates a signal including pulses indicative of the number of rotations of the wheel having the magnet mounted thereon. The signal is received by a receiver and the pulses are counted and displayed in order to provide a visual indication of the number of pulses, such being directly proportional to the length of cable which passes between the rollers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.