Cylinder with integrated locking

Patent metadata

Field	Value
Publication number	US-10605199-B2
Application number	US-201816491114-A
Country	US
Kind code	B2
Filing date	Feb 23, 2018
Priority date	Mar 6, 2017
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

A lockable actuator includes: a body; a screw for pivoting relative to the body; a nut engaged on the screw so as to move along the screw between an over-retracted first position and a deployed second position on opposite sides of a retracted third position; a sleeve constrained to rotate with the screw and slidably mounted thereon in order to be moved by the nut; and an obstacle secured to the sleeve and a pawl capable of passing collectively between an active state and an inactive state, the pawl and the obstacle being arranged in such a manner that the pawl in its active state can co-operate with the obstacle only after the nut has been moved through a predetermined distance from its third position towards its second position.

First claim

The invention claimed is:

1. A lockable actuator comprising:
a body;
a screw mounted on the body to pivot relative to the body about a longitudinal axis (Oy);
a nut provided with connection means for connection to an element to be moved and engaged on the screw so as to move along the screw between an over-retracted first position and a deployed second position on opposite sides of a retracted third position;
a sleeve constrained to rotate with the screw and slidably mounted thereon in order to be moved by the nut; and
an obstacle secured to the sleeve and a pawl that is mounted to move on the body and that is connected to a declutching actuator in order to control the pawl to take up an active state and an inactive state, the pawl having a blocking portion for co-operating with the obstacle in order to block turning of the screw in a first direction of rotation when the pawl is in its active state;
the pawl and the obstacle being arranged in such a manner that the pawl in its active state can co-operate with the obstacle only after the nut has been moved through a predetermined distance from its third position towards its second position.

2. The lockable actuator according to claim 1 , wherein the declutching actuator has return means for returning it to its active state in the event of the declutching actuator not being powered.

3. The lockable actuator according to claim 1 , wherein the declutching actuator comprises an electromagnet.

4. The lockable actuator according to claim 1 , wherein the screw includes an abutment limiting movement in translation of the sleeve.

5. The lockable actuator according to claim 1 , wherein the sleeve has a grooved portion for co-operating with fluting of the screw.

6. The lockable actuator according to claim 1 , including return means for returning the sleeve towards an abutment secured to the screw.

7. The lockable actuator according to claim 6 , wherein the return means comprise a helical spring.

8. The lockable actuator according to claim 1 , wherein the pawl includes a manual declutching device.

9. The lockable actuator according to claim 1 , wherein the sleeve comprises a first portion and a second portion, an outside diameter of the first portion being less than an outside diameter of the second portion.

10. The lockable actuator according to claim 9 , wherein the first portion is situated between a first end of the sleeve and a transverse face of the obstacle secured to the sleeve and that faces a first end of the sleeve.

11. The lockable actuator according to claim 1 , wherein the sleeve, the pawl, and the declutching actuator are arranged so as to allow the nut to move freely from a position lying between the deployed second position and the retracted third position towards the retracted third position, and to enable the pawl to be automatically in its active state when the nut passes to its retracted third position without any need to power the declutching actuator.

12. A jet nacelle including at least one lockable actuator according to claim 1 .

Assignees

• Safran Electronics & Defense

Inventors

• Werquin Mickael
• Hautecoeur Julien
• Bastide Christophe
• Omnes Pascal

Classifications

• F16H25/2454 Primary

  Brakes; Rotational locks · CPC title

• F16H25/2204

  with balls · CPC title

• F16D2121/22

  for releasing a normally applied brake · CPC title

• F15B2015/1495

  with screw mechanism attached to the piston · CPC title

• F15B15/261

  using positive interengagement, e.g. balls and grooves, for locking in the end positions · CPC title