Telescopic actuator

摘要

The invention relates to a telescopic actuator comprising a body (1) defining a cylindrical cavity of longitudinal axis (X); a rod (3) mounted to slide telescopically in the cylinder along the said axis; a nut (7) secured to the rod; a lead screw (4) mounted on the cylinder to extend along and rotate about the said axis (X) and collaborate with the nut in such a way that a rotation of the lead screw causes a telescopic movement of the rod in the cylinder; means (8, 9, 10) for driving the rotation of the lead screw.;According to the invention, the nut is mounted on the rod to be axially retained thereon by retaining means (12, 13, 14; 30 to 38) which can be made to release the nut axially from the rod.

主权项

1. A telescopic actuator comprising:
a body (1) defining a cylindrical cavity having a longitudinal axis (X); a rod (3) mounted to slide telescopically in the cylinder along said longitudinal axis; a nut (7) mounted on the rod to be axially retained thereon by retaining means (12, 13, 14; 30 to 38) which are commandable to release the nut axially from the rod; a lead screw (4) mounted on the cylinder to extend along and rotate about said longitudinal axis (X) and collaborate with the nut in such a way that a rotation of the lead screw causes a telescopic movement of the rod in the cylinder; means (8, 9, 10) for driving the rotation of the lead screw, wherein the retaining means comprises: claws (30) secured to the rod (3) and having ends (32) collaborating with the nut to retain the nut axially relative to the rod; a locking sleeve (34) sitting over the claws and mounted to rotate about the longitudinal axis (X) of the rod between an angular locking position in which the claws are prevented from flexing and an angular release position in which the claws are free to flex; and an actuating member designed to cause the locking sleeve to move on command from one position to another.