GB2099064A - Hooks - Google Patents

Abstract

A safety catch for a hook utilises a hose clip (13) which is secured about the shank of the hook (25). The adjusting screw of the hose clip has an axial passage which receives a pivot pin on which is received a biasing spring and a catch arm (22). The catch arm 22 is biased against the fluke of the hook by the spring, but can be turned against the spring bias to allow a ring to be placed on, or removed from, the hook. <IMAGE>

Description

SPECIFICATION Catch This invention relates to a safety spring catch for a hook, and particularly a hook for a crane, hoist or the like. Such a catch is carried by the hook and is spring-biased into a position closing the hook jaw and preventing the accidental escape of a ring from the jaw.

The present invention provides a simple and relatively inexpensive catch construction, which utilises an adjustable hose clip, of the type frequently known as a "Jubilee" clip, both to mount the catch on the hook and pivotally to support a catch arm intended to bridge the hook jaw.

A spring catch for a hook thus comprises, according to one aspect of the invention, a hose clip adapted to be secured to a hook adjacent the jaw; a catch arm, to bridge the hook jaw, pivotally mounted on the hose clip; and a spring acting on the catch arm and biasing it about its pivot axis.

Preferably, the catch arm is pivotally carried on the adjusting screw of the hose clip.

The invention will be more readily understood by way of example from the following description of a hook safety spring catch in accordance therewith, reference being made to the accompanying drawings, in which Figure 1 is a side elevation of a hook having a catch attached thereto, Figures 2 and 3 are respectively an end view and an under-plan view of the assembled catch, and Figures 4 and 5 are respectively an end view and a side view of the catch arm.

The spring safety catch utilises a hose clip 1 2 of the type generally known as a "JUBILEE" clip, and having a band 13 designed to encircle the shank of a hook, a housing 14 to which one end of the band is secured and through which the other end passes, and a captive screw 1 5 having a thread engaging the band and functioning to tighten or slacken the band in the manner of a worm and worm wheel.

The screw 1 5 is drilled through to form an axial passage 1 6 in which a pin 1 7 is secured so that it projects from the passage at each end. It is preferred to use as the pin 1 7 a wound wire pin of the type known as "SPIROL"; such a pin has the advantage that when inserted in the passage it expands to secure itself to the screw 1 5. A helical torsion spring 18 having free ends 20 and 21 is mounted about one projecting end of the pin.

A catch arm 22 is in channel form as shown particularly in Figures 4 and 5, the flanges 23 being tapered in side view (Figure 5) and having aligned holes 24 at their wider ends. The arm 22 is mounted over the clip 12 with the pin 17 received in the holes 22 so that arm 22 can pivot about the pin 17.

To assemble the catch on a hook 25, the clip 12 without the pin 1 7 or the arm 22 is fixed tightly on to the shank of the hook at or adjacent the jaw formed between the shank and the fluke or free end of the hook and with the housing 1 4 directed towards the fluke. The pin 1 7 and the spring 18 are then positioned as in Figure 2 with the end 21 engaging against the shank. Finally, the catch arm is sprung over the pin 17 with the spring end 20 engaging against the web of the arm, as shown in Figure 3. The spring 1 8 then biases the arm 22 against the fluke to bridge the hook jaw and prevent accidental removal of a ring or the like carried by the hook. However, the arm 22 can be turned against the bias of the spring to allow the ring to be placed on, or removed from, the hook.

1. A spring catch for a hook, comprising a hose clip adapted to be secured to the hook adjacent the jaw; a catch arm, to bridge the hook jaw, adapted to be pivotally mounted on the hose clip; and a spring to act oh the catch arm and to bias it about its pivot axis.

2. A spring catch according to claim 1, in which the catch arm is pivotally carried on the adjusting screw of the hose clip.

3. A spring catch according to claim 2, in which the catch arm is pivotally carried on a pivot pin located in an axial passage through the adjusting screw.

4. A spring catch according to claim 4, in which the pivot pin is a wound wire pin which when inserted in the axial passage secures itself to the screw.

5. A method of making a spring catch for a hook, in which a hose clip is secured about the shank of the hook adjacent the hook jaw; a pivot pin is inserted in an axial passage through the adjusting screw of the hose clip so that it projects from the passage at each end; a bias spring is located about one projecting end of the pin; and a catch arm is pivotally mounted on the pin so as to be biased by the spring into a position in which the catch arm closes the hook jaw and prevents accidental escape of a ring from the jaw.

6. A spring catch for a hook, substantially as herein described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Catch This invention relates to a safety spring catch for a hook, and particularly a hook for a crane, hoist or the like. Such a catch is carried by the hook and is spring-biased into a position closing the hook jaw and preventing the accidental escape of a ring from the jaw. The present invention provides a simple and relatively inexpensive catch construction, which utilises an adjustable hose clip, of the type frequently known as a "Jubilee" clip, both to mount the catch on the hook and pivotally to support a catch arm intended to bridge the hook jaw. A spring catch for a hook thus comprises, according to one aspect of the invention, a hose clip adapted to be secured to a hook adjacent the jaw; a catch arm, to bridge the hook jaw, pivotally mounted on the hose clip; and a spring acting on the catch arm and biasing it about its pivot axis. Preferably, the catch arm is pivotally carried on the adjusting screw of the hose clip. The invention will be more readily understood by way of example from the following description of a hook safety spring catch in accordance therewith, reference being made to the accompanying drawings, in which Figure 1 is a side elevation of a hook having a catch attached thereto, Figures 2 and 3 are respectively an end view and an under-plan view of the assembled catch, and Figures 4 and 5 are respectively an end view and a side view of the catch arm. The spring safety catch utilises a hose clip 1 2 of the type generally known as a "JUBILEE" clip, and having a band 13 designed to encircle the shank of a hook, a housing 14 to which one end of the band is secured and through which the other end passes, and a captive screw 1 5 having a thread engaging the band and functioning to tighten or slacken the band in the manner of a worm and worm wheel. The screw 1 5 is drilled through to form an axial passage 1 6 in which a pin 1 7 is secured so that it projects from the passage at each end. It is preferred to use as the pin 1 7 a wound wire pin of the type known as "SPIROL"; such a pin has the advantage that when inserted in the passage it expands to secure itself to the screw 1 5. A helical torsion spring 18 having free ends 20 and 21 is mounted about one projecting end of the pin. A catch arm 22 is in channel form as shown particularly in Figures 4 and 5, the flanges 23 being tapered in side view (Figure 5) and having aligned holes 24 at their wider ends. The arm 22 is mounted over the clip 12 with the pin 17 received in the holes 22 so that arm 22 can pivot about the pin 17. To assemble the catch on a hook 25, the clip 12 without the pin 1 7 or the arm 22 is fixed tightly on to the shank of the hook at or adjacent the jaw formed between the shank and the fluke or free end of the hook and with the housing 1 4 directed towards the fluke. The pin 1 7 and the spring 18 are then positioned as in Figure 2 with the end 21 engaging against the shank. Finally, the catch arm is sprung over the pin 17 with the spring end 20 engaging against the web of the arm, as shown in Figure 3. The spring 1 8 then biases the arm 22 against the fluke to bridge the hook jaw and prevent accidental removal of a ring or the like carried by the hook. However, the arm 22 can be turned against the bias of the spring to allow the ring to be placed on, or removed from, the hook. CLAIMS

1. A spring catch for a hook, comprising a hose clip adapted to be secured to the hook adjacent the jaw; a catch arm, to bridge the hook jaw, adapted to be pivotally mounted on the hose clip; and a spring to act oh the catch arm and to bias it about its pivot axis.

2. A spring catch according to claim 1, in which the catch arm is pivotally carried on the adjusting screw of the hose clip.

3. A spring catch according to claim 2, in which the catch arm is pivotally carried on a pivot pin located in an axial passage through the adjusting screw.

4. A spring catch according to claim 4, in which the pivot pin is a wound wire pin which when inserted in the axial passage secures itself to the screw.

5. A method of making a spring catch for a hook, in which a hose clip is secured about the shank of the hook adjacent the hook jaw; a pivot pin is inserted in an axial passage through the adjusting screw of the hose clip so that it projects from the passage at each end; a bias spring is located about one projecting end of the pin; and a catch arm is pivotally mounted on the pin so as to be biased by the spring into a position in which the catch arm closes the hook jaw and prevents accidental escape of a ring from the jaw.

6. A spring catch for a hook, substantially as herein described with reference to the accompanying drawings.