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Reversible screw-and-nut actuating device and sliding door equipped with such a device

  • US 5,077,938 A
  • Filed: 04/02/1991
  • Issued: 01/07/1992
  • Est. Priority Date: 04/11/1990
  • Status: Expired due to Fees
First Claim
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1. A reversible-screw-and-nut actuating device for maneuvering an element such as a leaf of a sliding door (1), the device comprising a screw (3) connected to a motor, a carriage (11) which can move along the screw and is connected at least indirectly to said element, the carriage comprising a nut (14) mounted on the screw (3) and a lock (16, 24) for locking the carriage automatically when the nut reaches one end of its travel and for unlocking the carriage (11) automatically when the screw (3) is moved in the direction tending to space the nut apart from said end of its travel, the device comprising means limiting the rotation of the nut about the axis (HH'"'"') of the screw, wherein the lock (16) can move with respect to the nut (14) and is stressed toward a locking position by a spring (29), and wherein the device comprises a force-transmission member (15) connected to the nut with a certain clearance, and means (31) which are sensitive to the relative position of the nut (14) and of the force-transmission member (15) in order to enable the spring (29) to bring the lock (16) into the locking position when the screw (3) rotates in the direction stressing the nut (14) toward said end of its travel, and in order to return the lock (16) positively into an inactive position when the screw rotates in the opposite direction.

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