Miniature potentiometer

Details Miniature potentiometer Miniature potentiometer

1994-04-14

1997-01-07

Leung, Philip H.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338127, 338202, H01C 1032

Patent

active

055921418

ABSTRACT:
A miniature potentiometer including a casing (10) molded on a first sub-assembly comprising a support (11), an electro-resistive track (12) with extensions (13) linked to terminals (14),(15) extending outwardly from the casing, and a collector plate (16) having a collector plate terminal (14) extending outwardly therefrom. A second sub-assembly is housed in the casing (10) and includes a wiper (18) integral with a wiper-holder (19). The first and second sub-assemblies are attached to one another by an electrically conductive shaft (21).
The wiper (18) comprises a first part defined by an annular plate (29) to which the wiper-holder (19) is molded. The first part also includes an opening (31) and through-holes (32) which allow plastic material to flow therethrough. The wiper (18) further comprises a second part (33), extending radially out from the annular plate (29) and having resilient arms (35,36) with protuberances (35a,36a) for frictionally engaging the resistive track (12). The second part (33) is folded 180 degrees against the bottom of the wiper-holder (19) and further comprises a slight cross fold (33a) in opposite sense to the 180 degree fold.
Prior to molding of the casing (10), the extensions (13) are connected to the pair of terminals (14),(15) using two folded lateral appendages (14b, 14c, 15b, 15c) extending from the lateral sides of each terminal (14),(15), one appendage (14b),(15b) from each terminal being in contact with the track (12) while the other appendage (14c),(15c) from each terminal provides retention.

REFERENCES:
patent: 2706760 (1955-04-01), Mucher
patent: 2958839 (1960-11-01), Barden
patent: 2974299 (1961-03-01), Youngbeck et al.
patent: 3631372 (1971-12-01), Yamamura
patent: 4429297 (1984-01-01), Nakatsu
patent: 4482883 (1984-11-01), Heredero
patent: 4835511 (1989-05-01), Henmi
patent: 4951378 (1990-08-01), Arriazu
patent: 5059940 (1991-10-01), Thomas, Jr.

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