Pawl and ratchet construction for hand winch

• US 3,939,729 A
• Filed: 10/03/1974
• Issued: 02/24/1976
• Est. Priority Date: 10/03/1974
• Status: Expired due to Term

• Current Assignee: Dutton-Lainson Company
• Original Assignee: Dutton-Lainson Company
• Inventors: Brockelsby, Norman D.
• Primary Examiner(s): Scott, Samuel
• Assistant Examiner(s): Shoemaker, F. D.
• Application Number:
  US05/511,657
• Time in Patent Office: 509 Days
• Field of Search: 74/577 M, 74/577 R, 74/575, 74/97, 74/526, 74/535, 188/82.2, 188/82.4, 188/82.7, 188/82.74, 188/82.77, 254/186 HC
• US Class Current: 74/575
• CPC Class Codes: B66D 5/34 having latches
• CPC Class Codes: Y10T 74/2133 Pawls and ratchets
• CPC Class Codes: Y10T 74/214 Multiple tooth

Abstract

The present invention is related to an improvement in a double-acting ratchet and pawl for controlling the operation of a hand winch. The pawl is pivotally mounted and engageable in two different positions with a driving gear which in turn is engaged with a driven gear operably connected to a winch reel. The improvement of this invention is primarily related to the pawl design and mounting and operation means therefor. With the design of the present invention, the pawl may be pivoted into any one of three principal locations corresponding to forward winch drive, reverse winch drive, and free-running winch drive. A latch plate holds the pawl fixedly in the desired position. A handle is provided for operating the pawl and a spring compressed against the handle operably holds the pawl against the latch plate. The pawl and the handle are pivotally connected on a shaft and mounted pivotally with respect to one another. A coiled spring connects the handle to the pawl for moving the pawl when the handle is operated.

Claims

1. In a winch having a winch reel, a driving gear, a driven gear engaging with the driving gear connected to the winch reel, and a ratchet and pawl apparatus for permitting forward and reverse movement of the winch, said pawl having first and second ratchet-engaging members thereon and pivotal on a shaft into a first position permitting winch rotation in only one rotational direction and into a second position permitting winch rotation in only the opposite rotational direction, an improvement in the ratchet and pawl arrangement comprising, in combination:

handle means for pivoting said pawl into said first and second positions, said handle means mounted for translational and rotational movement on the shaft,

latching means for engaging with said handle means and maintaining said handle means in fixed position when in contact with said handle means; and

biasing means for translating said handle means against said latching means whereby the pawl is maintained in the desired position until a deliberate translational force is exerted on the handle means sufficient to overcome the force of the biasing means.

2. The improvement as set forth in claim 1 wherein said handle means comprises a handle mounted for pivotal movement with said pawl, said pawl being pivotal in relation to said handle, and means connecting said pawl to said handle whereby, when said handle is pivoted, the connecting means causes the pawl to be pivoted therewith.

3. The combination as set forth in claim 2 wherein said connecting means is a spring connected to the handle and eccentrically connected to said pawl whereby, when said handle is rotated, the spring exerts torque on the pawl, causing the pawl to be flexibly rotated with the handle.

4. The combination as set forth in claim 2 wherein said handle includes an elongated handle section and a pawl guard section and in which said connecting means is connected between the outer end of the handle and the pawl, whereby the connecting means and pawl may be isolated from debris and adverse weather and whereby an operator may grasp the handle to move said pawl at a location remote from the gears.

5. The improvement as set forth in claim 1 wherein said biasing means comprises a spring compressed between a fixed member and the handle means.

6. The improvement as set forth in claim 1 wherein said biasing means includes a spiral coiled spring and a collar spacer member having a main section and a neck section radially smaller than the main section, with the pawl and handle means pivotal on the neck section and the spring wrapped about the neck portion and compressed between the handle means and the end of the main section adjacent the neck section.

7. The combination as set forth in claim 1 wherein the latch means comprises a plate mounted in fixed position adjacent the handle means, said plate including a plurality of stop members projecting therefrom and adapted to engage against and hold the handle means in any of a plurality of predetermined positions.

8. In a winch having a winch reel, a driving gear, a driven gear engaging with the driving gear connected to the winch reel, and a ratchet and pawl apparatus for permitting forward and reverse movement of the winch, said pawl having first and second ratchet-engaging members thereon and pivotal on a shaft into a first position permitting winch rotation in only one rotational direction and into a second position permitting winch rotation in only the opposite rotational direction, an improved ratchet and pawl arrangement comprising, in combination:

a pawl having first and second gear-engaging teeth thereon;

means for pivoting said pawl into a plurality of predetermined positions, said pawl-pivoting means pivotal on the shaft; and

a flexible connecting means connected between said pawl-pivoting means and said pawl whereby, when said pawl-pivoting means is rotated about said shaft, said connecting means exerts torque on said pawl, causing the pawl to be flexibly rotated with said pawl-pivoting means.

9. The improvement as set forth in claim 8 wherein said connecting means is a spring.

10. The improvement as set forth in claim 8 wherein said pawlpivoting means includes an elongated handle section covering said connecting means and a pawl guard section.