Home

Primary Examiner: Duggan, Donovan F.
Assistant Examiner:
Attorney: Kleinman; Milton E., Killian; George W.

Next ten patents ordered by date:

Ignition transducer for vehicle engines
Surface acoustic wave device comprising piezoelectric substrate having zinc oxide layer on .alpha.-alumina layer
Plasma image display device
Ion source having fluid-cooled supply conductors
Solid-state color imaging devices
Automatic headlight system
Lighting circuits
Light control system
Control system for spool drive of magnetic tape apparatus
Control circuit for a direct current motor

Translate:
En
De
Es
Fr
It
Pt
Ja
Ko
Zh

Title: Speed insensitive wheel detector

Abstract: An apparatus for detecting the presence and/or direction and/or velocity of a moving ferromagnetic element is provided. A sensing coil is placed in coupling relationship with a bi-stable ferromagnetic wire to provide a signal in response to a change in polarity of the core of the bi-stable wire. The core polarity changes in response to element presence as the element constitutes a magnetic shunt causing a change in magnetic flux density and/or direction in the air gap of a magnetic circuit in which the bi-stable wire is situated. The sensor is substantially insensitive to element velocity. Modified structures provide for fail-safe operation.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Birnbaum, David (Pittsford, NY, US)

Application Number: 907088
Filing Date: 1978-05-18
Publication_date: 1980-11-25
Assignee: General Signal Corporation (Stamford, CT)
Primary Class(es): 310/155 246/249, 310/168, 324/207.13, 324/207.17, 324/225, 324/239
Other Classes:
US Patent Ref:

3697745	Oct, 1972	Bolton	246/249.
3780313	Feb, 1973	Wiegand	310/168.

Other Refs: Other References: "Wiegand Wire: New Material for Magnetic-Based Devices", Electronics, 7/10/75, pp. 100-105.