Metal working – Method of mechanical manufacture – Electrical device making
Patent
1977-04-25
1978-11-14
Croyle, Carlton R.
Metal working
Method of mechanical manufacture
Electrical device making
1231465A, F02P 300
Patent
active
041249364
ABSTRACT:
A housing contains a circuit board having a Hall effect sensor attached thereupon and a magnetic circuit positioned to provide magnetic flux through the Hall effect sensor. The magnetic flux through the Hall effect sensor is interruptable by a high permeability vane moving through an air gap in the magnetic circuit, activating the Hall effect sensor to provide timing signals for an automotive ignition distributor system. The housing contains a flux concentrator and a magnetic and pole piece assembly on opposite sides of the circuit board. Adhesive means fix the magnetic circuit elements and the circuit board in position.
A method for assembling the magnetic circuit elements and the circuit board within the housing described above includes resiliently holding the circuit board in the reference position in the housing. The flux concentrator is inserted within the housing and a gapping gauge having magnetizable portions is attached to the magnet and pole piece assembly, the combination is then inserted into the housing on the opposite side of the circuit board so that the flux concentrator is drawn towards the circuit board and the magnet and pole piece assembly. The magnet and pole piece assembly, the concentrator, and the circuit board are then adhesively fixed to the housing and the gapping gauge is removed to provide a predetermined air gap between the circuit board and the magnet and pole piece assembly, allowing passage of the moving vane within a precisely dimensioned air gap.
REFERENCES:
patent: 4008701 (1977-02-01), Webber
patent: 4011476 (1977-03-01), Beard
Croyle Carlton R.
Gillman James W.
King Patrick
Koczo, Jr. Michael
Melamed Phillip H.
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