TELESCOPING LINEAR ACTUATOR WITH SCREW DRIVES

Title:

TELESCOPING LINEAR ACTUATOR WITH SCREW DRIVES

Document Type and Number:

WIPO Patent Application WO/2013/133830

Kind Code:

A3

Abstract:

A linear actuator (20) including three nested telescoping sections (22, 24, 26) actuated by two internal screw drives (28, 30). First and second screw drive nuts (32, 34) are rotatably mounted in the intermediate telescoping section (24) to linearly translate respective first and second screw shafts (36, 38), which are fixed to respective distal ends (21, 27) of the outer (22) and inner (26) telescoping sections. The drive nuts may be mounted at opposite ends of the intermediate section in a housing (23, 25, 29), and may be driven by a motor (40) therein via an idler shaft (42) that spans between the two drive nuts. The motor may be designed to serve alternately as a regenerative resistance brake (R1). A mechanical brake (43) may alternately or additionally be provided. Either or both brakes may be set to engage by default on power outage.

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Inventors:

CASTELLI PETER M (US)
GIANNETTO ANTHONY JACK (US)

Application Number:

PCT/US2012/028216

Publication Date:

April 03, 2014

Filing Date:

March 08, 2012

Export Citation:

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Assignee:

THOMSON IND INC (US)
CASTELLI PETER M (US)
GIANNETTO ANTHONY JACK (US)

International Classes:

F16H25/20

Foreign References:

US20020162410A1	2002-11-07
US20070295126A1	2007-12-27
USRE26484E	1968-11-05
US3947740A	1976-03-30
US20060145044A1	2006-07-06
US6401565B1	2002-06-11

Other References: