DE7728576U1 - SAFETY HOOK - Google Patents

Description

The innovation concerns a safety hook, especially for winches of overhead traveling cranes, with one provided at one end with a connection eyelet for a lifting element and at its other end under demarcation the hook opening nose-shaped curved body, as well as a pivotable, the hook opening covering or releasing locking lever.

In such known hooks, the axis can through the connection eyelet a shackle to which a hoist rope is connected is. The locking lever is used to close the hook opening when a load is attached to the hook to prevent the

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Load slips while operating the crane if it accidentally hits an obstacle. In addition, the locking lever avoid any risk of uncoupling the load when it is in contact with the ground, especially on the End of downward movement.

It is also known to have the locking lever in the closed position to provide an effective locking system. When the locking lever unlocks when uncoupling or coupling a load the opening of the hook is made by pivoting about its axis of rotation released. This pivoting movement is usually carried out by manually actuating the locking lever. Such an operation is difficult with large hooks with very heavy locking levers. It requires that the hook be the one charged with this operation Operator is easily accessible, which is not always the case.

In order to avoid this disadvantage, it has been proposed that The closing and locking of the locking lever can be controlled by the lifting force of the load. However, such a solution leads to relative complicated and expensive construction of the hook, especially if the lifting force is constantly exerted on the locking lever itself. Security is also no longer guaranteed if the load comes into contact with the ground.

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It is also known to lock the locking lever in the open position, to facilitate said operations; this is particularly advantageous for hooks with large dimensions. the Actuating the locking and unlocking of the locking lever then results in some difficulties when the hook is not easily accessible.

The task of the innovation is to avoid the disadvantages mentioned and to create a safety hook with an extremely simple structure, whose locking lever can be locked in the open position from a distance is easy to operate.

Based on a safety hook of the type mentioned, the innovation solves the problem in that the locking lever with an actuating arm is connected that both together around one articulation axis fixed on the body of the hook are pivotable and that a locking device is arranged on the body of the hook which can be brought into engagement with the actuating arm in its position corresponding to the open position of the locking lever is.

The locking device advantageously has a pawl and it is the hinge axis of the hinge connecting the locking lever and the operating arm to the body on the side of the The opening is offset from the vertical through the center of the eyelet.

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I Another feature of the innovation is that the locking

I lever around the joint between the opening of the hook

t closing locking position and one releasing the opening

Ji open position inside the hook is pivotable and that

k the unit of locking lever and actuating arm by gravity

% can be swiveled into the locked position.

Ii In further development of the innovation is the actuating arm with a

I working cylinder coupled and another working cylinder there

't free the actuator arm from its locked position.

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A non-limiting embodiment of the innovation is shown in the drawing and is described in more detail below.

It show: =

Pig. 1 is a side view of the safety hook the innovation;

Pig. 2 shows a section through a detail along line 1-1 of the Pig. 1;

Pig. Figure 3 is a section through a detail along line 2-2 of Pig. 1; and

Pig. 4 a section along line 3-3 of the Pig. 1.

As can be seen from the drawing, the hook consists of a body 1, one end of which is provided with an eyelet 2 for connection to a lifting element (not shown) _o the other end of the hook a nose 3 is curved in shape so that the 2 and adjacent part of the body 1, the opening of the hook is defined between the nose of the eyelet.

The body 1 is close to the eyelet 2 with a joint 4 with a Equipped to the center plane of the hook perpendicular axis, around which a locking lever 5 is pivotably attached.

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The axis 3 of the joint 4 is in the direction of the opening of the The hook is offset from the vertical through the center of the eyelet 2. The locking lever 5 is arranged in such a way that it rests in the open position on the body 1 of the hook and in the closed position on the nose 3 "The locking lever so swivels towards the inside of the hook to release the opening under the conditions that will be explained later, and it pivots under the action of gravity in the opposite direction to cover the opening.

The pivoting movement of the locking lever 5 out of its closed position is connected to the locking lever 5 by a device Arm 6 actuated »The actuating arm 6 consists of a lever pivotably attached to the axis of the joint 4, which is attached to the locking lever 5 at the same height, for example by welding »At this height, the end of the The locking lever 5 represents a fork, the prongs 5a and 5b of which are attached to either side of the body 1; this is from the Axis of the joint 4 penetrated. The actuating arm 6 is welded to one of the two prongs, namely to the prong 5b.

It is easy to understand that with a suitable length of the actuating arm 6, the locking lever from a certain distance can be actuated «The arm 6 is advantageously actuated by a working cylinder, not shown.

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When through. Action of the arm 6 of the locking lever 5 fully open it is blocked in this position by a locking device for the arm 6, as follows is described.

This locking device consists of a pawl 7 which is pivotable about the axis 8 of a support arm 9; this is attached to the body 1 at approximately the same height as the joint, for example by welding, but is located on the side opposite the joint in relation to the vertical through the center of the eyelet _o When the arm 6 reaches the end of the opening path, causes he the pivoting of the pawl 7 and penetrates into a recess of the pawl in which it is held. When the arm is released from the pawl 7, it is pivoted in the opposite direction. The arm 6 can be unlocked manually, but it can also be actuated by a working cylinder.

To couple a load, the arm 6 is either done by hand or raised by means of a working cylinder in such a way that the locking lever 5 pivots into the open position. In this Arm 6 is locked in position. After coupling the load, the arm 6 is unlocked, either manually or by a working cylinder, and under the action of gravity, the locking lever 5 falls back into its closed position back at Hase 3. The hook can be advantageous

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equipped with an additional safety device
that prevents the hoist winch from being started if the locking lever does not cover the opening.

? All the necessary operations can be easily carried out from the

"' can be controlled remotely. Otherwise, the arrangement makes

of the locking lever 5 inside the hook, which after unlocking

I locking the arm .6 closing the locking lever

J the 'force of gravity allows any special locking

: no installation necessary in the closed position.

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Claims (1)

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il · · · Patent attorneys Dip! - Ing. A. WEDDE " Dipl-ing. K. E M P L Munich 80, Schumannstr. 2 - I - "" '24. November 1977 Government office!. File number: G 77 28 576.8 File: Gm 23 Protection claims. 1.) Safety hooks, especially for winches of overhead traveling cranes, with one at one end with a connection eyelet for a lifting element provided and at its other end a nose-shaped curved body, delimiting the hook opening, and a pivotable locking lever covering or releasing the hook opening, thereby g a k e η η ζ e i c h η e t that the locking lever (5) is connected to an actuating arm (6) that both together are pivotable about a hinge axis fixed on the body (1) of the hook and that a locking device is provided on the body (1) of the hook is arranged, which with the actuating arm (6) in its corresponding to the open position of the locking lever (5) Position can be brought into engagement. 2.) security hook according to claim 1, characterized z e i c h η e t that the locking device has a pawl (7) having. -II- 7728578 02/23/78 ftf IMl - II - · 3.) Safety hook according to claim 1, characterized in that the hinge axis of the Locking lever (5) and the actuating arm (6) with the body (1) ί connecting joint (4) to the side of the opening in relation ; offset to the vertical through the center of the eyelet ^is t 4.) Safety hook according to one of claims 1, 2 or 3, characterized in that the locking lever (5) around the joint (4) between one of the opening of the Hook closing the locking position and one the opening releasing open position inside the hook is pivotable and that the unit of locking lever and actuating arm (6) can be pivoted into the locked position by gravity. 5.) Safety hook according to one of claims 1 to 4, characterized in that the actuating arm (6) is coupled to a working cylinder. 6.) Safety hook according to one of claims 1 to 5, characterized in that a working cylinder the actuating arm (6) out of its locked position releases. F / room 2 7728576 23.0178