Control knob with rotation limiter
OwnerArnold R. Postinventor
Life of this patent
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Abstract
A predetermined limit in the rotation of a manually rotatable control shaft is established by a special knob having a speed nut which secures the knob to the shaft, and an interrupted circular slot in the knob, concentric with the shaft, for cooperating with a fixed projection extending parallel to the shaft and into the circular slot. The device is described as usable in a thermostatically controlled heating system with an auxiliary control for improving efficiency.
Claims4
Apparatus for establishing a predetermined limit in the rotation of a manually rotatable control shaft comprising a manually operable knob, speed nut means, fixed with respect to said knob, and having an opening for receiving said shaft, said speed nut means securing said knob permanently to said shaft in fixed relationship, and means located underneath said knob and engageable with said knob for limiting the rotation of said knob.
Dependencies are inferred from the claim text.