This application is a National Stage completion of PCT/AU2009/001455 filed Nov. 9, 2009, which claims priority from Australian patent application Ser. No. 2008 905987 filed Nov. 20, 2008.
The present invention relates to a winch, and particularly relates to a spindle for a winch used to restrain loads carried on a truck or the like.
Drivers of trucks and the like are typically required by law to ensure that loads they carry are properly restrained. Proper restraint of loads is required to ensure the safety of other road users.
One technique used for restraining a palletted load on the bed of a truck is to utilise a length of webbing and a winch. One end of a length of chain or webbing is secured at one edge of the truck bed, is passed over the palletted load, and the free end is wound onto the winch. The winch includes a spindle which is driven by inserting one end of a bar into an aperture through the spindle and rotating the bar. A pawl on the winch cooperates with a series of teeth on the spindle to keep the winch in a tightened state.
The truck body obstructs rotation of the bar, thus the winch is tightened in a series of part rotations. The bar is rotated through a partial turn, is removed, and re-inserted into the spindle in its initial rotational position so that it can be turned again. The spindle continues to be turned a little at a time until the desired tension in the webbing is achieved.
The continual removal and re-insertion of the bar into the spindle is time consuming, particularly in the case of soft, compressible loads. Thus, it has been tried to provide a ratchet mechanism in the spindle. The bar is rotated to tighten the winch, and when its limit of rotation is reached it can be rotated back to its starting position without removing it from the aperture. The winch is kept tight by the existing pawl mechanism, and the ratchet mechanism allows the bar to rotate back to its starting position. However, to date these ratchet type mechanisms have been found to be very vulnerable to failure.
In a first aspect the present invention provides a spindle for a winch including:
a first member for winding a length of a restraint; a second member for rotationally driving the first member; the second member engages with the first member by way of an arrangement which permits relative rotational movement between the first and second members in one direction only; and a portion of the second member is received into a bore in the first member to support the second member with respect to the first member.
The portion of the second member may be a sliding fit in the bore of the first member.
The second member may enagge with the first member by way of a ratchet arrangement which may include at least one cam and a plurality of followers.
The followers may be oriented to move radially with respect to the axis of rotation of the spindle.
The followers may be mounted on leaf springs.
The followers may engage the cam in a compressive mode.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
Referring to
Spindle 20 further includes a second member in the form of capstan 24. Capstan 24 is mounted to spool 22 by way of a ratchet mechanism 26 which allows relative rotational movement between the capstan and the spool in one direction only as will now be described.
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It can be seen that embodiments of the invention have at least the following advantages:
Any reference to prior art contained herein is not to be taken as an admission that the information is common general knowledge, unless otherwise indicated.
Finally, it is to be appreciated that various alterations or additions may be made to the parts previously described without departing from the spirit or ambit of the present invention.
Number | Date | Country | Kind |
---|---|---|---|
2008905987 | Nov 2008 | AU | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/AU2009/001455 | 11/9/2009 | WO | 00 | 8/12/2011 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2010/057244 | 5/27/2010 | WO | A |
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Number | Date | Country | |
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20110284678 A1 | Nov 2011 | US |