Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1997-06-30
1999-08-31
Graysay, Tamara L.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
744248B, 744248R, F16H 2522
Patent
active
059439106
ABSTRACT:
A telescopic multiple ball screw nut linear actuator has an outer screw and first nut defining a first helical ball raceway between them. The screw has a tubular portion with an axially open outer end on which a second nut is fixed. An inner screw, providing with the second nut a second helical ball raceway of opposite hand, is received within the outer screw tubular portion and is projectable from its open outer end, and a non-helically grooved, plug end fitting the inner diameter of the tubular portion of the outer screw is provided on the axially inner end of the inner screw and coacts with the tubular portion of the outer screw, with only an operating clearance therebetween, to restrain whipping when the inner screw is in projected position. The plug in one position relative to the second nut establishes the limit of projection of the inner screw by blocking the travel of the balls in the second raceway from the second nut to the inner screw.
REFERENCES:
patent: 1635397 (1927-07-01), Burkholder
patent: 1741793 (1929-12-01), Runyan
patent: 3029660 (1962-04-01), Sears
patent: 3314655 (1967-04-01), Steele
patent: 3762227 (1973-10-01), Bohnhoff
patent: 4295384 (1981-10-01), Brandt et al.
patent: 4732365 (1988-03-01), Kloster
patent: 5002172 (1991-03-01), Stringer
Graysay Tamara L.
Joyce William C
Thomson Saginaw Ball Screw Company, L.L.C.
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