Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1990-03-08
1992-08-11
Lateef, Marvin M.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
26427218, 26427219, 338 32H, B29C 4514, H01L 4300
Patent
active
051376776
ABSTRACT:
An integrally molded Hall sensor device for detecting the crankshaft angle of an automotive engine. The injection mold includes a projection 1a extending into a cavity and having a width equal to that of a gap through which a magnetic shutter passes. Before the molding, the parts are assembled utilizing a skeletal frame having first and second opposing pairs of vertically extending guide members, and the inserted electrical conductor for the Hall IC is embedded in the frame. The Hall IC and associated parts are accommodated in a holder, which is thereafter fitted between the first pair of guide members, to be translatable toward the gap; a magnetic circuit member including a permanent magnet is fitted between the second pair of the guide members to be translatable toward the gap. The assembled parts are then put into the mold such that the surfaces flanking the gap are positioned at respective sides of the projection. A flowing resin is injected into the mold such that the holder and the magnetic circuit member are driven by the flow against the respective side surfaces of the projection. Thus, the width of the gap can be precisely determined by the width of the projection without utilizing jigs.
REFERENCES:
patent: 4156820 (1979-05-01), Fukuda et al.
patent: 4296424 (1981-10-01), Shibasaki et al.
patent: 4359978 (1982-12-01), Brammer et al.
Lateef Marvin M.
Mitsubishi Denki K.K.
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