Hand winch with brake and freewheel

• US 8,695,945 B2
• Filed: 08/12/2010
• Issued: 04/15/2014
• Est. Priority Date: 08/13/2009
• Status: Active Grant

• Current Assignee: Francois-Xavier Guyard
• Original Assignee: Francois-Xavier Guyard
• Inventors: Guyard, Francois-Xavier
• Primary Examiner(s): Marcelo, Emmanuel M
• Assistant Examiner(s): Stefanon, Justin
• Application Number:
  US12/855,083
• Publication Number:
  US 20110062273A1
• Time in Patent Office: 1,342 Days
• Field of Search: 254/346, 254/345, 254/342, 254/347, 254/348, 254/350, 254/356, 254/357, 254/375, 254/376, 254/380, 464/30, 192/56.1, 192/56.6
• US Class Current: 254/346
• CPC Class Codes: B66D 1/06 Safety cranks for preventing unwanted crank rotation and subsequent lowering of the loads
• CPC Class Codes: B66D 1/14 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 Class Codes: B66D 5/22 with axial effect

Abstract

A hand winch including a winding roll, a flexible elongated member, a shaft connected to the winding roll, a friction brake including a brake disk and a gear element engaging the winding roll and mounted on the shaft. The gear element has a release position and a brake position in which the gear element enters into frictional contact with the brake disk, generating a braking torque resisting winding off the flexible elongated member. Friction means is provided between the shaft and the gear element for generating a frictional resistance therebetween such that, if a driving force acting on the gear element does not overcome the frictional resistance established by the friction means, the gear element drives the shaft through friction means. However, if the driving force between the shaft and the gear element overcomes the frictional resistance, relative movement between the gear element and the shaft occurs.

Claims

1. A hand winch comprising:

a winding roll for receiving a flexible elongated member;

a manually operated shaft acting on the winding roll;

a friction brake including a brake disk slidably mounted on said shaft and a gear member engaging said winding roll and mounted on said shaft such that said gear member can move between a release position and a brake position in which said gear member enters into frictional contact with said brake disk, thus generating a braking torque opposite to a direction of winding off said flexible elongated member for braking said winding roll; and

in which said brake disk applies an axial force generated by said gear member onto counter bearing means mounted on said shaft for separately applying both torsional forces and axial forces to said shaft.

2. A hand winch as in claim 1, in which said counter bearing means comprises a torque transmitting disk mounted on said shaft for transmitting torsional forces to said shaft without transmitting any substantial axial forces to said shaft, and an axial force transmitting disk separate from said torque transmitting disk and mounted on said shaft for transmitting axial forces to said shaft without transferring any substantial torsional forces to said shaft, wherein said torque transmitting disk comprises a non-rotational hole for receiving said shaft, and in which said shaft has a respective non-rotational portion engaged with said hole in said torque transmitting disk.

3. A hand winch as in claim 2, in which said axial force transmitting disk comprises a rotational opening cooperating with a another shaft portion having a respective rotational groove allowing rotation of said disk about said shaft.

4. A hand winch as in claim 1 in which said counter bearing means comprises a torque transmitting disk for applying torsional forces to said shaft without applying any substantial axial forces to said shaft, and an axial force transmitting disk for transmitting axial forces to said shaft without applying any substantial torsional forces to said shaft.

5. A hand winch comprising:

a winding roll for receiving a flexible elongated member,

a manually operated shaft acting on said winding roll, and

a friction brake including, a brake disk and a gear member engaging with said winding roll and mounted on said shaft such that said gear member can move between a release position and a brake position in which said gear member enters into frictional contact with said brake disk, thus generating a braking torque opposite to a direction of winding off said flexible elongated member, for braking said winding roll,

wherein said brake disk is slidably mounted on said shaft such that it transmits an axial force generated by said gear member onto a counter bearing arranged on said shaft, said counter bearing comprising a torque transmitting disk mounted on said shaft for transmitting torsional moments to said shaft without transmitting any substantial axial forces to said shaft, and an axial force transmitting disk separate from said torque transmitting disk and mounted on said shaft for transmitting axial forces to said shaft without transferring any substantial torsional moments to said shaft.

6. The hand winch as in claim 5 in which said torque transmitting disk comprises a non-rotational hole for receiving said shaft and in which said shaft has a respective non-rotational portion engaged with said hole in said torque transmitting disk.

7. The hand winch as in claim 5 in which said axial force transmitting disk comprises a rotational opening cooperating with a respective shaft portion having a rotational groove allowing rotation of said axial force transmitting disk about said shaft.