Lifting hook, safety latch of lifting hook and locking and releasing device of safety latch

Patent metadata

Field	Value
Publication number	US-9630809-B2
Application number	US-201414760146-A
Country	US
Kind code	B2
Filing date	Jan 10, 2014
Priority date	Jan 11, 2013
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A lifting hook, its safety latch and a locking and releasing device of the safety latch are disclosed. The lifting hook includes a hook body having a hook stem and tip. The safety latch has a fastening end and a free latch end, the fastening end of the safety latch being pivotally fastened close to the stem so as to move the safety latch between an open position and a closed position, the safety latch being in its open position substantially against the inside of the hook body in a position that leaves a hook jaw free, while in the closed position the latch end extends across the hook jaw to the hook tip, closing the jaw on the inside thereof. A spring arranged between the safety latch and hook body forces the latch end into the closed position. The locking and releasing device includes a locking and releasing lever that is arranged to turn freely between a turning axle of the safety latch and latch end in the front area of the safety latch and that in its locking position rests against the hook tip and keeps the safety latch in its open position against the inner side of the hook body.

First claim

The invention claimed is:

1. A lifting hook comprising:
a hook body with a hook stem and a hook tip;
a safety latch with a fastening end and a free latch end, the fastening end of the safety latch being pivotally fastened close to the hook stem so as to move the safety latch between an open position and a closed position, the safety latch being in its open position substantially against the inside of the hook body in a position that leaves a hook jaw free, while in the closed position of the safety latch the latch end extends across the hook jaw to the hook tip and against the hook tip, resting against the inside of the hook body and the hook jaw, closing the hook jaw; and
an actuator configured to actuate the safety latch, the actuator comprising a spring arranged between the safety latch and the hook body and forcing the latch end into the closed position, and a locking and release device for locking the safety latch into the open position and for releasing the safety latch from the open position,
wherein the locking and releasing device of the safety latch comprises a locking and releasing lever that is arranged to turn freely between a turning axle of the safety latch and the latch end in the front area of the safety latch and wherein in a locking position of the locking and releasing lever rests against the hook tip and keeps the safety latch in an open position against the inner side of the hook body.

2. The lifting hook as claimed in claim 1 , wherein the locking and releasing lever comprises a bent wire loop, the ends of which are fastened to the safety latch to turn from sides thereof so that the locking and releasing lever resembles a closed loop.

3. The lifting hook as claimed in claim 1 , wherein the locking and releasing lever comprises a two-part bent wire loop, the halves of which are joined together by a connecting piece in the area touching the hook tip, and the free ends are fastened to the safety latch to turn from sides thereof so that the assembled locking and releasing lever resembles a closed loop.

4. The lifting hook as claimed in claim 1 , wherein the locking and releasing lever comprises a bent wire loop that is fastened at one end to the safety latch to turn on one side thereof so that the locking and releasing lever resembles an open loop.

5. The lifting hook as claimed in claim 1 , wherein the locking and releasing lever comprises a plate-like part having on sides thereof fastening lugs that extend to the sides of the safety latch, and the locking and releasing lever is fastened to the safety latch by a fastening pin passing through the lugs.

6. The lifting hook as claimed in claim 1 , wherein one edge of the safety latch has a cutting, into which a locking and releasing lever is arranged that fills the cutting and substantially complies with the shape of the adjacent safety latch portion, and the back surface of the lever has a fastening lug, and the locking and release lever is fastened to the back surface of the safety latch by a fastening pin passing through the lug.

7. The lifting hook as claimed in claim 1 , wherein the centre of the safety latch has a cutting, into which a locking and releasing lever is arranged that fits into this cutting and extends partly to the top surface of the safety latch, and the back surface of the lever has a fastening lug, and the locking and release lever is fastened to the back surface of the safety latch by a fastening pin passing through the lug.

8. A safety latch for use in a lifting hook that comprises a hook body with a hook stem and hook tip, the safety latch being fastenable close to the hook stem and comprising:
a fastening end and a free latch end, the fastening end of the safety latch being pivotally fastened close to the hook stem so as to move the safety latch between an open position and a closed position, the safety latch being in the open position substantially against the inside of the hook body in a position that leaves a hook jaw free, while in the closed position of the safety latch the latch end extends across the hook jaw to the hook tip and against the hook tip, resting against the inside of the hook body and the hook jaw, closing the hook jaw; and
an actuator configured to actuate the safety latch, the actuator comprising a spring arranged between the safety latch and the hook body and forcing the latch end into the closed position, and a locking and release device for locking the safety latch into the open position and for releasing the safety latch from the open position,
wherein the locking and releasing device of the safety latch comprises a locking and releasing lever that is arranged to turn freely between a turning axle of the safety latch and the latch end in the front area of the safety latch and wherein in a locking position of the locking and releasing lever rests against the hook tip and keeps the safety latch in an open position against the inner side of the hook body.

9. The safety latch as claimed in claim 8 , wherein the locking and releasing lever comprises a bent wire loop, the ends of which are fastened to the safety latch to turn from sides thereof so that the locking and releasing lever resembles a closed loop.

10. The safety latch as claimed in claim 8 , wherein the locking and releasing lever comprises a two-part bent wire loop, the halves of which are joined together by a connecting piece in the area touching the hook tip, and the free ends are fastened to the safety latch to turn from sides thereof so that the assembled locking and releasing lever resembles a closed loop.

11. The safety latch as claimed in claim 8 , wherein the locking and releasing lever comprises a bent wire loop that is fastened at one end to the safety latch to turn on one side thereof so that the locking and releasing lever resembles an open loop.

12. The safety latch as claimed in claim 8 , wherein the locking and releasing lever comprises a plate-like part having on sides thereof fastening lugs that extend to the sides of the safety latch, and the locking and releasing lever is fastened to the safety latch by a fastening pin passing through the lugs.

13. The safety latch as claimed in claim 8 , wherein one edge of the safety latch has a cutting, into which a locking and releasing lever is arranged that fills the cutting and substantially complies with the shape of the adjacent safety latch portion, and the back surface of the lever has a fastening lug, and the locking and release lever is fastened to the back surface of the safety latch by a fastening pin passing through the lug.

14. The safety latch as claimed in claim 8 , wherein the centre of the safety latch has a cutting, into which a locking and releasing lever is arranged that fits into this cutting and extends partly to the top surface of the safety latch, and the back surface of the lever has a fastening lug, and the locking and release lever is fastened to the back surface of the safety latch by a fastening pin passing through the lug.

15. The safety latch as claimed in claim 8 , wherein the safety latch is arranged to be fastened directly to a bore made on the hook stem or the top part of the hook body and intended for fastening the safety latch.

16. The safety latch as claimed in claim 8 , wherein the safety latch comprises a mounting part for fastening around the hook stem or top part of the hook body.

17. The safety latch as claimed in claim 16 , wherein the mounting part comprises a band to be fastened around a top part of the hook stem or hook body and having a hole arranged in a bent protrusion thereof for a turning and fastening shaft o

Assignees

• Konecranes Plc
• Konecranes Global Corp

Inventors

• Hoover Jack

Classifications

• B66C1/36 Primary

  with means, e.g. spring-biased detents, for preventing inadvertent disengagement of loads · CPC title

• F16B45/02

  Hooks with pivoting {or elastically bending} closing member · CPC title

• F16B45/036

  with an elastically bending closing member · CPC title

• F16B45/026

  and including a coil type spring · CPC title

• F16B45/023

  the closing member pivoting about an axis perpendicular to the plane of the hook · CPC title