Variable potentiometer

Claim 2

A variable potentiometer comprising a base of insulating material supporting a resistive track having connecting tags electrically connected to the respective ends thereof, a collector fixed to the base and having an annular portion including a frustoconical face, said collector being provided with a further electrical connecting tag, a slider rotatably mounted on the annular portion of the collector contacting the frustoconical face, said annular portion constituting an axis of rotation for the slider, said slider being compressed by the annular portion against said base and supporting a stud for contact with the resistive track.

Claim 3

A potentiometer as claimed in claim 1, in which the slider has a slot for the insertion of an adjusting means, said collector having stop-edges defining the limits of travel of the slider.

Claim 4

A potentiometer as claimed in claim 1 wherein the slider comprises a ring portion which includes projections in contact with the face of the base, a tongue extending radially from the ring portion, said stud in contact with the resistive track and carried by said tongue, and said potentiometer includes a control knob having two protuberances on one face thereof, and a stem mounting the knob and passing through the annular portion, said tongue of the slider fitting with slight clearance between said protuberances.

Claim 5

A potentiometer as claimed in claim 3, in which the control knob has a central slot intended to receive the end of a screwdriver blade.

Claim 6

A potentiometer as claimed in claim 3, wherein the collector has two stop edges, said protuberances engaging one of the stop edges at each limit of travel of the collector.

Claim 7

A potentiometer as claimed in claim 1, comprising a screw, a plate fixed to the base on the side thereof facing away from the slider and having a tapped aperture therein, the head of said screw abutting against the collector and the shank being engaged in the tapped bore of the plate, said screw serving to apply pressure to the slider.

Claim 8

A potentiometer as claimed in claim 6, in which the plate has two springy tabs disposed symmetrically about the centre of the screw and having their tips engaging in the threads thereof.

Claim 9

A potentiometer as claimed in claim 6, in which the annular portion of the slider has a stamped collar, the edge of which abuts the base at the termination of the screw tightening movement.

Claim 10

A variable potentiometer comprising a base of insulating material supporting a resistive track having connecting tags electrically connected to the respective ends thereof, a collector fixed to the base and having an annular portion including a frustoconical face, said collector being provided with a further electrical connecting tag, said collector and the connecting tags being initially made in one piece and subsequently separated from the collector by a cutting out operation, the base of insulating material having two openings disposed one on each side of the tag of the collector, said openings enabling the other tags, one of which is disposed on each side of the collector tag, to be electrically separated from the collector, and a slider rotatably mounted on the annular portion of the collector contacting the frustoconical face, said mounting arrangement on said collector constituting an axis of rotation for the slider, said slider being compressed by the annular portion against said base and supporting a stud for contact with the resistive track.

Claim 11

A variable potentiometer comprising a base of insulating material supporting a resistive track having connecting tags electrically connected to the respective ends thereof, a collector fixed to the base and having an annular portion including a frustoconical face, said collector being provided with a further electrical connecting tag, said collector and the connecting tags being initially made in one piece and subsequently separated from the collector by a cutting out operation, the base of insulating material having two openings disposed one on each side of the tag of the collector, said openings enabling the other tags, one of which is disposed on each side of the collector tag, to be electrically separated from the collector, and a slider rotatably mounted on the annular portion of the collector contacting the frustoconical face, said mounting arrangement on said collector constituting an axis of rotation for the slider, said slider being compressed by the annular portion against said base and supporting a stud for contact with the resistive track.