Sliding-type variable resistor

Claim 2

A sliding-type variable resistor comprising a baseplate with a square-groove-shaped cross section; a couple of protruded guide rails for guiding a sliding block being provided along both sides of said baseplate; resistance elements and conductive elements being disposed in parallel with each other on said baseplate; a sliding block with contactors fixed on the lower side thereof and with a plate spring and an operating means disposed on the upper side thereof, said sliding block being made to slide on said baseplate in a horizontal direction while said contactors are maintained in contact with said resistance elements and conductive elements; a box-type housing mounted on said baseplate in such a manner as to contain said sliding block and provided with a slot on the upper side thereof in such a manner as to allow said operating means to move along said slot, said operating means being projected through said slot; a friction plate fixed at the foot of said operating means of said sliding block and pressed against the ceiling of said housing by means of a plate spring disposed on said sliding block, said friction plate being made to slide together with said sliding block; and a grease layer being interposed between said ceiling of the housing and said friction plate.

Claim 3

A sliding-type variable resistor according to claim 1, in which said friction plate is flat.

Claim 4

A sliding-type variable resistor according to claim 1, in which said friction plate is provided with square protrusions with a very small surface area at the four corners of the upper side thereof contacting the ceiling of said housing.

Claim 5

A sliding-type variable resistor according to claim 1, in which said friction plate is provided with curved grooves in the longitudinal direction on the upper side thereof contacting the ceiling of said housing.

Claim 6

A sliding-type variable resistor comprising a baseplate with a square-groove-shaped cross section, a couple of protruded guide rails for guiding a sliding block being provided along both sides of said baseplate; resistance elements and conductive elements being disposed in parallel with each other on said baseplate; a sliding block with contactors fixed on the lower side thereof and with an operating means disposed on the upper side thereof, said sliding block being made to slide on said baseplate in a horizontal direction while said contactors are maintained in contact with said resistance elements and conductive elements; a box-type housing mounted on said baseplate in such a manner as to contain said sliding block and provided with a slot on the upper side thereof in such a manner as to allow said operating means to move along said slot, said operating means being projected through said slot; a friction plate fixed at the foot of said operating means of said sliding block, said friction plate having a curved portion of resilient material and two flat portions each having a flat upper surface and extended laterally from both sides of said curved portion, said friction plate being disposed between said sliding block and the ceiling of said housing in such a manner that said curved portion is biased to contact each of said flat surfaces to the ceiling of said housing with a grease layer therebetween, whereby said flat surfaces are pressed to said ceiling through said grease layer by the force of said biased curved portion of said friction plate.

Claim 7

A sliding-type variable resistor comprising a baseplate with a square-groove-shaped cross section, a couple of protruded guide rails for guiding a sliding block being provided along both sides of said baseplate; resistance elements and conductive elements being disposed in parallel with each other on said baseplate; a sliding block with contactors fixed on the lower side thereof and with an operating means disposed on the upper side thereof, said sliding block being made to slide on said baseplate in a horizontal direction while said contactors are maintained in contact with said resistance elements and conductive elements; a box-type housing mounted on said baseplate in such a manner as to contain said sliding block and provided with a slot on the upper side thereof in such a manner as to allow said operating means to move along said slot, said operating means being projected through said slot; a friction plate fixed at the foot of said operating means of said sliding block, said friction plate having a curved portion of resilient material and two flat portions each having a flat upper surface and extended laterally from both sides of said curved portion, said friction plate being disposed between said sliding block and the ceiling of said housing in such a manner that said curved portion is biased to contact each of said flat surfaces to the ceiling of said housing with a grease layer therebetween, whereby said flat surfaces are pressed to said ceiling through said grease layer by the force of said biased curved portion of said friction plate.