Telescopic actuator with a main rod and an auxiliary rod, and a method making use thereof
AssigneeMessier-Bugatti
InventorsDaniel Bucheton, Hervé Charuel
Life of this patent
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Abstract
The invention relates to a telescopic actuator comprising a cylinder in which a main rod is mounted to slide telescopically along a sliding axis between a retracted position and an extended position. The actuator includes an auxiliary rod mounted to slide telescopically in the main rod along said sliding axis between a retracted position and an extended position, the actuator including controlled retaining means for retaining the auxiliary rod in the retracted position inside the main rod.
Claims17
A telescopic actuator comprising a cylinder in which a main rod is mounted to slide telescopically along a sliding axis X between a retraced position and an extended position, the telescopic actuator including an auxiliary rod mounted to slide telescopically in the main rod along said sliding axis between a retracted position and an extended position, the actuator including controlled retaining means carried by the main rod and by the auxiliary rod for retaining the auxiliary rod in the retracted position inside the main rod, and wherein said retaining means are carried by the main rod and by the auxiliary rod, and comprises controlled sliding means for controlling sliding of the main rod in the cylinder, said controlled sliding means comprising:
- a motor member;
- a lead screw extending along the sliding axis and rotatably mounted on the cylinder so as to be driven in rotation by the motor member;
- a nut secured to the main rod and co-operating with the lead screw;
- and
- antirotation means for preventing the main rod from rotating relative to the cylinder,
- and in which the lead screw has one end guided by a first ball joint mounted on the cylinder, and another end guided by a second ball joint slidably mounted in the auxiliary rod.
A telescopic actuator comprising:
- a cylinder in which a main rod is mounted to slide telescopically along a sliding axis X between a retraced position and an extended position,
- an auxiliary rod mounted to slide telescopically in the main rod along said sliding axis between a retracted position and an extended position,
- controlled retaining means carried by the main rod and by the auxiliary rod for retaining the auxiliary rod in the retracted position inside the main rod, wherein said retaining means are carried by the main rod and by the auxiliary rod, and the controlled retaining means comprise:
- a catch carried by the main rod;
- a step carried by the auxiliary rod to co-operate with the catch;
- and
- a lockable sleeve carried by the main rod and displaceable axially between a release position in which the sleeve leaves the catch free to deform radially under the effect of a step of the auxiliary rod going past it, and a locking position in which the sleeve prevents the catch from deforming radially, the catch then co-operating with the step to define the retracted position of the auxiliary rod.
A telescopic actuator comprising:
- a cylinder in which a main rod is mounted to slide telescopically along a sliding axis X between a retraced position and an extended position,
- an auxiliary rod mounted to slide telescopically in the main rod along said sliding axis between a retracted position and an extended position,
- controlled retaining means carried by the main rod and by the auxiliary rod for retaining the auxiliary rod in the retracted position inside the main rod, wherein said retaining means are carried by the main rod and by the auxiliary rod, and
- sliding brake means for braking the sliding of the auxiliary rod in the main rod in the extension direction, the sliding brake means comprising:
- a driver co-operating with the main rod via a reversible helical connection having the sliding axis as its axis so that the driver rotates when the auxiliary rod slides in the main rod;
- a bushing mounted to rotate on the auxiliary rod about the sliding axis on being driven in rotation by the driver, at least while the auxiliary rod is extending from the main rod;
- and
- a friction member mounted on the auxiliary rod and against which the bushing rubs while it is being driven in rotation by the driver.
Dependencies are inferred from the claim text.