Machine element or mechanism – Control lever and linkage systems – Hand operated
74109, 74471R, 74471XY, 74483PB, 74523, 338 78, G05G 904, H01C 1000
A squeeze type manual actuator including a control arm with a pair of hand grips extending from the upper end of the arm, at least one of the hand grips being mounted on the arm for movement toward and away from the other hand grips. The hand grips are provided with gripping pads and have a normal spacing in which the pads are respectively engageable by the palm and finger tips of one hand of the operator. The movable hand grip engages a plunger having a return spring. A signal producing device is coupled to the plunger for producing an output signal of pre-selected polarity and which varies in accordance with plunger displacement. In the preferred embodiment of the invention the arm has upper and lower sections with limited lost motion between them in opposite directions from a neutral position. The polarity is pre-selected in accordance with the direction of relative movement between the sections so that by moving the hand grips in a direction to take up lost motion an output signal of desired polarity is produced upon subsequent squeezing together of the hand grips. The arm is hinged at its lower end and a second signal-producing means produces a second output signal in accordance with the rocking movement of the arm, thereby enabling simultaneous independent control of multiple functions. In an alternate embodiment a double-throw switch is used for polarity selection, the switch being mechanically interlocked to prevent throwing between its alternate states when the hand grips are in squeezed condition.
patent: 1614777 (1927-01-01), Dellagala
patent: 3131795 (1964-05-01), Shimanckas
patent: 3233472 (1966-02-01), Canalizo et al.
patent: 3701288 (1972-10-01), Jordan
patent: 4062508 (1977-12-01), Stephens
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