EP0552403A1

EP0552403A1 - Winch handle

Info

Publication number: EP0552403A1
Application number: EP92111558A
Authority: EP
Inventors: Tripp Estabrook
Original assignee: Harken Inc
Current assignee: Harken Inc
Priority date: 1992-01-22
Filing date: 1992-07-08
Publication date: 1993-07-28
Anticipated expiration: 2012-07-08
Also published as: EP0552403B1; AU1835692A; DE9218571U1; DE69204648T2; DE69204648D1; DE552403T1; NZ243185A; DK0552403T3; AU648900B2

Abstract

A manually operated winch crank is characterized by a crank arm (10) having a shaft (16) extending at right angles to the arm (10), a tubular handle (22) rotatably mounted on the shaft (16), and a reduced height knob (28) rotatably mounted above the tubular handle (22). The tubular handle (22) is manually operated with the palm parallel to the axis of rotation, and the knob (28) is operated with the palm perpendicular to the axis of rotation.

Description

Background of the Invention

This invention relates to winch handles or hand cranks which are used to manually operate a winch or capstan. For example, many larger sailboats utilize winches to provide a mechanical advantage in controlling lines such as a fairleads and halyards. The winch has a drive socket for releasably receiving a lug of the winch handle. The line is wrapped around the drum of the winch, and the winch contains gears to provide a mechanical advantage between the crank and the drive socket and drum.
A conventional winch handle comprises an arm extending away from the rotational axis of the winch, and an upright shaft at the free end of the arm. A handle of generally tubular shape is rotatably mounted on the shaft. The crank rotated by manually grasping the handle, with the palm of the hand being generally parallel to the axis of rotation of the handle and winch. Another conventional version currently in use comprises a pair of identical rotatable tubular handles mounted in succession on a common shaft. This permits two handed operation by one or two people. The latter type is used primarily for heavy load conditions because it is larger and more clumsy to use and store than the single handle version. In sailboats, winch handles are normally stowed in vertical pockets in the cockpit with the grip projecting at right angles at the top of the pocket.

Summary of the Invention

In accordance with the present invention, a two handed winch crank is provided with a conventional lower tubular handle and a separate shorter upper rotatable knob having an enlarged outwardly facing head. The lower handle is operated with the palm parallel to the axis of rotation, whereas the upper knob is operated with the palm facing downwardly or perpendicular to the axis of rotation. This allows for faster and more efficient cranking in comparison to conventional two handle cranks. Also, the strength and weight of the arm and shaft may be less than conventional two handle versions because the reduced height or shaft length provides less bending moments on these parts. Finally, the crank of the present invention, being reasonably compact and easy to use, can eliminate the need for having to carry two types of handles on a sailboat.

The Drawings

Figure 1 is a side view, partly in section of the winch crank of the present invention.
Figure 2 is a perspective view of one version of the winch handles of the present invention.
Figure 3 is a perspective view of a second configuration of the winch handles of the present invention.
Figure 4 is a side view of another configuration of the winch handle.

Description of the Preferred Embodiments

Figure 1 illustrates a winch cranking device comprising an elongated crank arm 10 having a faceted downwardly depending lug 12 secured at one end and adapted to drivingly engage a drive socket of a conventional winch (not shown) and to rotate the socket around a generally vertical axis in the orientation shown at 14. A conventional locking device 17 may be employed to releasably lock the lug 12 into the socket.
The crank arm 10 is angled slightly upward from horizontal from the lug end, with the free end of the arm having an upwardly extending or vertical shaft 16, which extends at right angles from the arm and is secured to the arm by means of securement of a lower portion 18 of the shaft 16 into an opening 20 in the arm. The axis of the shaft is generally parallel to the axis of rotation 14 at the winch.
A lower, conventional handle 22 or grip of elongated tubular or barrel shape is rotatably mounted on the shaft 16 adjacent to the arm 10 by means of bearings, such as the upper 24 and lower 26 ball bearing races between the shaft and the respective ends of the handle.
In addition, and contrary to similar devices in the prior art, the upper or second handle 28 is in the form of a separate rotatable knob having a relatively enlarged head. The knob 28 is rotatably mounted on the free end of shaft 16 adjacent to the upper end of lower handle 22 by means of upper 30 and lower 32 ball bearing races. The knob 28 is restrained from upper axial movement by means of a washer 34 bearing downwardly on its outer periphery against the upper ball race, and having its central portion secured to the end of the shaft 16 by a bolt 36. As shown, the lower bearing race 32 may also bear on the top edge of the lower handle 22.
The lower handle 22 is intended to be operated in a conventional fashion, with the palm of the hand extending parallel to the axis of rotation around the shaft. In contrast, the upper, separately rotatable, knob 28 is designed and intended to be operated with the palm facing downwardly, or perpendicular to the axis of rotation, with the palm against or spaced from the upper rounded surface of the knob. Conventional two handle cranks operated in this fashion because there is a fixed end portion above the second handle.
It will be noted in Figure 1 that the upper knob 28 has a height or length which is substantially less than the height or length of the lower handle 22. This provides a more compact profile and provides reduced bending movements on the shaft and crank arm in comparison with conventional versions, allowing a lighter weight construction.
In addition, the use of the knob 28 alone facilitates faster cranking, especially at lower loads or when the line is relatively slack. Two handed cranking is also facilitated, since the upper knob allows for a more efficient or compact form of movement between the hands and arms. Thus, the crank may be operated by the use of the handle or knob separately, or the use of both parts together.
Figures 2,3 and 4 illustrate two of the possible various configurations of the upper knob. As shown in Figure 2, the knob 28 may have a round or circular upper surface 40 with rounded sides 42. A round shape is easily grasped and facilitates palms down rapid turning of the crank handle. Figure 3 shows a rounded knob 44 having one or more ridges 44 to prevent slipping. Figures 4 shows a rounded knob 46 having an elongated T-shaped or oblong body, which is better adapted to fit between the palm and fingers of the hand.

Claims

A winch crank for rotating a winch mechanism around axis, in which the crank includes a crank arm, with one end of the arm being adapted for driving connection to the winch mechanism, and the other end having a shaft extending parallel to said axis toward a free end and having a tubular crank handle rotatably mounted on the shaft, characterized in that a separate knob having an enlarged head is rotatably mounted on the end of the shaft adjacent the tubular handle.
The winch crank according to claim 1, characterized in that the knob is round.
The winch crank according to claim 1, characterized in that the knob in oblong.
The winch crank according to claim 1, characterized in that the length the knob along the shaft is less than the length of the handle along the shaft.
The winch crank according the claim 1, characterized in that the crank is operated with a hand grasping the tubular handle parallel to the axis of the shaft or with the palm of a hand grasping the knob perpendicular to the axis of the shaft.