H - Electricity – 01 – H
Patent
H - Electricity
01
H
74/71
H01H 3/16 (2006.01) B66F 3/08 (2006.01) F16H 25/20 (2006.01)
Patent
CA 1156495
LINEAR ACTUATOR ABSTRACT OF THE DISCLOSURE A linear actuator for providing a thrust force for actuating various movable members, such as, for example lever arms, crank slides and valve flaps. The thrust force is applied by an extension rod that is arranged within a housing so as to extend in an axial direction along the housing and out from the housing. The extension rod has a load connector mounted on the end outside of the housing for connection to the movable member to which the thrust force is to be applied. A drive screw is attached to the extension rod so that rotation of the drive screw is translated into an axial displacement of the extension rod. A drive motor serves to rotate the drive screw. While the extent of displacement of the extension rod can be controlled by a limit switch mechanism, a blockage in the path of the movement of the movable member will prohibit the movement of the movable member and the extension rod. Either when such a blockage occurs of when the extension rod has reached the end of its path of travel, any attempt for continued movement of the extension rod significantly increases the thrust force applied to the rod. In order to prevent the continued application of such force and resulting damage to the system, a thrust control mechanism is provided for terminating operation of the drive motor when the thrust force exceeds selected thrust force limits. The thrust control mechanism includes an adjustable device for enabling the thrust force limits to be selectively adjusted. Such adjustments for selecting the limits of the thrust force can be made without requiring disassembly or any adjustment to the major working mechanism of the linear actuator. -1-
364045
Andco Actuator Products Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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