Machine element or mechanism – Shaft operators – Gear drive
Patent
1974-12-20
1976-09-28
Scott, Samuel
Machine element or mechanism
Shaft operators
Gear drive
74 8915, 1161155, 116124R, F16H 3518
Patent
active
039824420
ABSTRACT:
A mechanism for the precisional turning of a threaded shaft or leadscrew wherein the turning of a hand knob is used to precisionally regulate the amount of turning of the shaft. By the hand turning of a drive knob, a pair of ring drive keys are made to move along the upper surface of a cam unit having two lobes and two recesses. A castellated counter ring, which is placed around the cam unit has equally spaced cogs which normally will not be engaged by the ring drive keys. However, when the ring drive keys fall into the recesses of the cam surface, they engage against two cogs on the counter ring causing them to shift a fixed amount, after which the rise of the lobe of the cam raises the ring drive keys out of engagement with the cogs of the counter ring. The effect of this is to turn the shaft, for example, 1/10 of a shaft revolution. The counter ring has inner index teeth which go into and out of engagement with notches placed in the cylindrical sides of the cam until said index notches (being equally spaced around the periphery of the cam surface) in, for example, ten equal intervals. Index numbers placed opposite the counter ring cogs can be referenced to an index mark to indicate the number of intervals that the shaft has been turned from its zero position. In one utilization of the shaft positioner, a wedge carriage threaded onto the turning shaft can be arranged to raise or lower the position of a wedge for auxiliary control purposes.
REFERENCES:
patent: 2782751 (1957-02-01), Yanikoski
patent: 3219353 (1966-08-01), Koppelman
patent: 3241515 (1966-03-01), Franklin
patent: 3580216 (1971-05-01), Weber
Bell Edward L.
Falk Julian
Heald Randall
Scott Samuel
Smith Robert E.
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