Safety release mechanism for linear actuator
First Claim
1. A safety release mechanism for a linear actuator, and the linear actuator having a lead screw and a telescopic tube, and the safety release mechanism comprising:
- a nut, threadedly and drivingly coupled to the lead screw;
a protection shroud, fixedly and drivingly coupled to an edge of the nut;
a telescopic tube sleeve, with an end sheathed on the protection shroud and another end fixed to the telescopic tube, and having a plurality of notches formed at an outer periphery of the telescopic tube sleeve;
a clutching element, sheathed on the telescopic tube sleeve, and having a plurality of protrusions formed on the clutching element, and selectively inserted into or detached from the notches; and
a spiral spring, sheathed on the protection shroud and the clutching element;
thereby, when the lead screw is rotated clockwise, then the spiral spring drives the protection shroud in a tight binding manner, and the clutching element and the telescopic tube sleeve is moved linearly together, and when the lead screw is rotated counterclockwise and the telescopic tube is blocked, then the protection shroud is released from being elastically clamped by the spiral spring, and the protection shroud is rotated together with the lead screw.
1 Assignment
0 Petitions
Accused Products
Abstract
A safety release mechanism for a linear actuator having a lead screw and a telescopic tube includes a nut, a protection shroud, a sleeve connected to the telescopic tube, a clutching element and a spiral spring. The nut is threadedly and drivingly connected to the lead screw. The protection shroud is fixedly and drivingly connected to one side of the nut. One end of the sleeve is sheathed on the protection shroud while the other end thereof is fixedly connected to the telescopic tube. The outer periphery of the sleeve is formed with notches. The clutching element is sheathed on the sleeve and formed with protrusions configured to be selectively inserted into or removed from the notches. The spiral spring is sheathed on the protection shroud and the clutching element. With this arrangement, cleavage or damage of components can be prevented to thereby increase the safety of operation.
20 Citations
16 Claims
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1. A safety release mechanism for a linear actuator, and the linear actuator having a lead screw and a telescopic tube, and the safety release mechanism comprising:
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a nut, threadedly and drivingly coupled to the lead screw; a protection shroud, fixedly and drivingly coupled to an edge of the nut; a telescopic tube sleeve, with an end sheathed on the protection shroud and another end fixed to the telescopic tube, and having a plurality of notches formed at an outer periphery of the telescopic tube sleeve; a clutching element, sheathed on the telescopic tube sleeve, and having a plurality of protrusions formed on the clutching element, and selectively inserted into or detached from the notches; and a spiral spring, sheathed on the protection shroud and the clutching element; thereby, when the lead screw is rotated clockwise, then the spiral spring drives the protection shroud in a tight binding manner, and the clutching element and the telescopic tube sleeve is moved linearly together, and when the lead screw is rotated counterclockwise and the telescopic tube is blocked, then the protection shroud is released from being elastically clamped by the spiral spring, and the protection shroud is rotated together with the lead screw. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A linear actuator, comprising:
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a driving mechanism including a holder and an electric motor mounted to the holder for producing clockwise and counterclockwise rotations; a lead screw, driven by the electric motor for producing a rotation; an outer tube, sheathed on the exterior of the lead screw, and fixed to an end of the holder, and having a stop element installed on the outer tube and at an end away from the holder; a telescopic tube, passed and coupled into the outer tube, and capable of extending or retracting with respect to the outer tube; and a safety release mechanism, comprising a nut threadedly and drivingly coupled to the lead screw;
a protection shroud, fixedly and drivingly coupled to an edge of the nut;
a telescopic tube sleeve, with an end sheathed on the protection shroud and another end fixed to the telescopic tube;
a clutching element, sheathed on the telescopic tube sleeve, and installed corresponding to the stop element;
a spiral spring sheathed on the protection shroud and the clutching element, and having a plurality of notches formed at an outer periphery of the telescopic tube sleeve, and the clutching element having a plurality of protrusions formed thereon and inserted into or detached from the notches respectively;thereby, when the lead screw is rotated clockwise, then the spiral spring drives the protection shroud in a binding manner to drive the protection shroud, the clutching element and the telescopic tube sleeve to move linearly together, and when the clutching element is passed through a position of the stop element and blocked, the clutching element is pushed away to release the link relation with the telescopic tube sleeve, such that the telescopic tube and the telescopic tube sleeve stop moving outward. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification