The present invention relates to a safety locking device for a lifting hook according to the preamble of claim 1.
It is known to provide lifting hooks with safety locking devices. However, these safety locking devices comprise several parts, such as locking means and locking springs, for instance, to close the safety locking device against the lifting hook itself. The safety locking device is thereby complicated to manufacture and install at the lifting hook.
The object of the invention is to achieve a safety locking device for a lifting hook, which device is easy to manufacture, install and comprises only one component part.
Said object is achieved according to the invention in that the safety locking device for a lifting hook comprises a lifting part and a hook part having a first and a second shank arranged in the same plane, the first shank being joined to the lifting part, the safety locking device being pivotably attached to either of the shanks or the lifting part and comprises a spring means formed integrally with the safety locking device to automatically bring the safety locking device to bear against the lifting part or the opposite shank for preventing unhooking of a hoisting cable or similar means introduced into the hook part, said safety locking device having a general U-shape with two legs, characterized in that the spring means is elongated and fixed at one of its ends to that part of the U-shaped safety locking device which connects the two legs of the U, and that the other part of the spring means is arranged to bear on either of the shanks or the lifting part of the lifting hook.
A non limiting example of the invention will now be described with reference to the accompanying drawings, in which
As seen in
Furthermore, the spring means 7 and the two legs 8 of the U are arranged in the same plane as can be inferred from
The respective legs 8 of the safety locking device are provided with pivot pins 9 facing each other at the end of the shanks of the U opposite the attachment point for the spring means, which pivot pins are adapted to cooperate with diametrically opposed and complementary arranged holes 10 in the second shank 6. The holes 10 are preferably arranged at a suitable distance from the hook part 4, as can be seen in
By choosing material and thickness of material of the spring means 7, and adapt the thickness of the material between the edge of the hole 10 and the edge of the shank 6, faced towards the opposite shank, the degree of spring action of the safety locking device can be adapted according to the requirements.
The safety locking device 1 should be made of a resilient material, preferably a plastic material.
A safety locking device 1 designed according to the above results in that the end of the safety locking device arranged opposite to its fastening end at the shank 6 will automatically be brought to bear against the lifting part 3 or the opposite shank.
Number | Date | Country | Kind |
---|---|---|---|
0600973 | May 2006 | SE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/SE2007/000379 | 4/20/2007 | WO | 00 | 10/28/2008 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2007/126355 | 11/8/2007 | WO | A |
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264530 | Hammond | Sep 1882 | A |
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3105280 | Davis | Oct 1963 | A |
4689859 | Hauser | Sep 1987 | A |
6907645 | Jenson et al. | Jun 2005 | B2 |
Number | Date | Country |
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668343 | Dec 1938 | DE |
741573 | Feb 1933 | FR |
1368427 | Sep 1974 | GB |
2006-153159 | Jun 2006 | JP |
50291 | Apr 1921 | SE |
Number | Date | Country | |
---|---|---|---|
20090206049 A1 | Aug 2009 | US |