Winch equipped with a variable torque limiter

Patent metadata

Field	Value
Publication number	US-12398025-B2
Application number	US-202118266244-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Dec 17, 2020
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

A winch includes a rotary drum, a cable which can be wound on the drum in multiple layers, and a brake for braking the rotation of the drum, the brake being calibrated to permit the rotation of the drum beyond a variable torque which decreases as the length of the cable wound on the drum increases.

First claim

The invention claimed is:

1. A winch comprising a frame, a drum which can rotate in relation to the frame about an axis of rotation, a cable which can be wound on the drum in multiple layers, a brake for braking the rotation of the drum, the brake being calibrated to permit the rotation of the drum beyond a variable torque which decreases as the length of the cable wound on the drum increases, and a mechanism for adjusting the torque exerted by the brake comprising a screw-nut system of which the nut is driven in rotation with the drum, and of which a translational movement of the screw driven by the nut is configured to adjust the torque exerted by the brake.

2. The winch as claimed in claim 1 , wherein the brake comprises at least one first plate which is movable in translation in relation to the frame along the axis of rotation of the drum and is prevented from rotating in relation to the frame about the axis of rotation of the drum, at least one second plate which is prevented from rotating in relation to the drum about the axis of rotation of the drum, a compression element designed to compress the first plate against the second plate along the axis of rotation of the drum, and wherein the adjusting mechanism is configured to adjust the compression of the compression element depending on the rotation of the drum.

3. The winch as claimed in claim 2 , wherein the compression element is a first elastic element which exerts a force proportional to its length (L) along the axis of rotation of the drum.

4. The winch as claimed in claim 2 , comprising a mechanism for manoeuvring the brake between two positions, a first position enabling the free rotation of the drum and a second position in which the brake opposes the rotation of the drum up to the variable torque, wherein the brake manoeuvring mechanism is configured to deactivate the adjusting mechanism in the first position of the brake.

5. The winch as claimed in claim 4 , wherein the brake manoeuvring mechanism comprises a third plate disposed between the first elastic element and the first plate, the third plate being movable in translation along the axis of the drum, and wherein the brake manoeuvring mechanism is configured to compress the first elastic element by moving it away from the first plate in its first position and to leave the third plate free in its second position.

6. The winch as claimed in claim 5 , wherein the brake manoeuvring mechanism comprises a second elastic element disposed between the first plate and the third plate.

7. The winch as claimed in claim 1 , comprising a mechanism for manoeuvring the brake between two positions, a first position enabling the free rotation of the drum and a second position in which the brake opposes the rotation of the drum up to the variable torque.

8. The winch as claimed in claim 7 , comprising a motor for making the drum rotate, and a control module permitting the rotation of the motor in the first position of the brake manoeuvring mechanism and preventing the rotation of the motor in the second position of the brake manoeuvring mechanism.

Assignees

• Thales Sa

Inventors

• Lagadec Jean
• Bendelac Steve

Classifications

• F16D43/216

  with multiple lamellae · CPC title

• B66D5/12

  with axial effect (B66D5/22 takes precedence) · CPC title

• B66D1/14

  Power transmissions between power sources and drums or barrels {(including brakes, one-way brakes, one-way clutches, clutches activated alternately with brakes, fixed ratio gearing unless otherwise provided for in B66D1/16 - B66D1/24)} · CPC title

• B66D1/58 Primary

  responsive to excess of load · CPC title