Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1985-10-17
1987-06-16
Husar, Cornelius J.
Machine element or mechanism
Gearing
Directly cooperating gears
74459, 74 8915, 192150, 411432, F16H 120
Patent
active
046728589
ABSTRACT:
A nut/clutch assembly for a rotary power screw, such as a linear actuator power screw, is disclosed in which the power screw is selectively rotated in one direction or the other, and in which the power screw has a pair of stops spaced apart from one another and which are rotatable with the power screw. A nut is provided having a central opening threadably engageable with the power screw, and the nut is threadably movable in axial direction along the power screw upon rotation of the latter. The nut has a circumferential groove thereon, and this groove has a base and a pair of spaced side walls. A collar is slidably received within the circumferential groove, and the collar is resiliently clamped onto the nut such that the collar frictionally engages the grooved base with a desired frictional force so as to permit the nut to rotate relative to the collar upon the nut being rotatably driven by the screw, and upon the collar being held in fixed rotary position. The collar is secured to a portion of its application in such manner as to prevent rotation of the collar and so as to transmit linear force between the application and the power screw. The collar is somewhat narrower than the circumferential groove in the nut so that upon the nut moving axially along the power screw and upon the collar being coupled to the application, the collar resists axial movement of the nut and frictionally engages one of the side walls of the groove thereby to hold the nut against turning with the power screw, and further to ensure axial movement of the nut together with the collar along the power screw. When the nut engages one of the stops, the nut is positively rotated with the power screw and the collar held by the application turns relative to the nut so as to serve as a clutch.
REFERENCES:
patent: 2834051 (1958-05-01), Rekettye
patent: 3043552 (1962-07-01), Colautti
patent: 3277736 (1966-10-01), Goodman
patent: 3364757 (1968-01-01), Sears
patent: 3559500 (1971-02-01), Galonska et al.
patent: 3563106 (1971-02-01), Goodman
patent: 3587796 (1971-06-01), Nestvogel
patent: 3703113 (1972-11-01), Feisel
patent: 3731546 (1973-05-01), MacDonald
Emerson Electric Co.
Fischetti Joseph A.
Husar Cornelius J.
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