SAFETY DEVICE FOR GRASPING DEVICE FOR LIFTING SOME MASONRY ELEMENTS

Abstract: The invention concerns a safety device on grasping devices for masonry elements (7). The safety device prevents falling of blocks or bricks out of the grasping device. The invention concerns an appliance (1) where after grasping and hoisting of the load almost directly two arms (3, 4) direct a profile (5, 6) under the load. On putting down of the load the arms gives way at touching on the floor and the grasping device (1) can open. The arms are provided with rollers (8) which spread the arms on putting down and close at hoisting. The grasping device is foreseen with plates that prevents elements falling sideways out of the grasping device and supporting plates (11) which keep the arms spreaded when the grasping device is opened. The invention can also be executed as do it yourself kit.

Description: SAFETY DEVICE FOR GRASPING DEVICE FOR LIFTING SOME MASONRY ELEMENTS The invention concerns a safety device on grasping devices for masonry elements. The safety device prevents falling of blocks or bricks out of the grasping device. It is usual to load and unload packages of stones, blocks sand-lime bricks and similar with the help of grasping devices. Also horizontal transporting of packages with the help of hydraulic cranes is done with these grasping devices. In many cases are sand-lime bricks used in separation walls and similar and the sand-lime bricks have to be brought to high levels. Sand-lime bricks are characterized by grit and dust through that makes the friction amongst themselves low. This makes the chance for sliding out of an element large. It is than necessary to have a safety device that prevents falling out of a loose element out of the package. The problem is that the packages have to be taken from the floor with the grasping device. There is no possibility to fit a safety device underneath the package. In praxis the package is hoisted a iittle and a steel net is pulled under the load and fastened. Before putting down the net has to be removed an the load can be placed. The invention concerns an appliance where after grasping and hoisting of the load almost directly two arms direct a profile underneath the load. When the load is put down the arms gives way at touching on the floor and the grasping device can open. There is no need for an action to remove the safety device. The invention is described with help of the drawing. Fig. 1 shows a grab without a safety device. Fig. 2 shows the side-view of a grab with safety device with the load on short distance of the ground. Fig. 3 shows a grab with the load on the ground. Fig. 4 shows partly the top view of a grab with safety device in open position. Fig. 1 shows a grab of the type that is used to load or unload packages bricks or blocks. The grab uses the movement of a scissors to pinch the package between beams which are covered with rubber when hoisting. In Fig. 2 is (2) the grab. On joints (2) are two pivoting arms (3, 4) connected. Arms have about the form of a "L" and reach over load (7) and down. To arms (3, 4) are profiles (5, 6) secured, for instance by welding. Profiles (5, 6) are the same length as beams (9). To the end of arms (3, 4) are rollers (8) mounted which extend out of profiles (5, 6). To the ends of beams (9) are fixed plates (10) to prevent sideways falling out of blocks. Supporting plates (11) curtail the movement of arms (3, 4) so that with picking up of the load (7) profiles (5, 6) will not touch onto the load. The grab will be held open by a catch (not drawn) after opening at putting down the load (7) . The arms (3, 4) are held open by supporting plates (11) . When the grab with arms (3, 4) is placed across the load rollers (8) touch the ground and with moving further downwards of the grab the arms (3, 4) will be spread. When the grab weighs upon the load (7) the catch will discharge the grab and at hoisting on eye (12) the grab will close and take up the load (7). On taking up rollers (8) lose contact with the ground and by their weight arms (3, 4) will move to each other and profiles (5, 6) will be under the load. When now a brick gets loose it will be cached by profiles (5, 6). Plates (10) prevent outer brick (13) to fall out sideways. At putting down of the load (7) rollers (8) will have the first contact with the ground and arms (3, 4) spread themselves and with further descending the grab will open and the catch will keep the grab open and a new load (7) can be picked up. There is a possibility that adapting joints (2) is not desirable. In that case a separate joint can be placed near joint (2). Because of clearance it is desirable to make the horizontal part (14) of arms (3, 4) as long as possible. The invention can also executed as a do it yourself kit and be mounted on existing grabs. There are different handles possible for directing the grab across the load to be mounted to arms (3, 4), these are not mentioned.

Claims: Claims, 1. Safety device for grab which is meant to hoist packages masonry elements preventing falling out of elements characterised by that grab (1) is foreseen with arms (3, 4) with profiles (5, 6) which are pivotal connected to joints (2) of the grab (1) and turn about until profiles (5, 6) find themselves underneath the load where rollers (8) at going down of grab (1) at ground contact spread arms (3, 4). 2. Safety device for grab as in claim 1 characterised by that with opened grab (1) arms (3, 4) with profiles (5, 6) also are opened by supporting plates (11). 3. Safety device for grab as in claim 1 and 2 characterised by that grab (1) is foreseen with plates (10) to prevent sideways falling out of bricks (13). 4. Safety device for grab as in claim 1 , 2 and 3 characterised by that arms (3, 4) connected pivotal to or near joint (2) of the scissor construction of grab (1) that is at the other side of profile (5, 6). 5. Safety device for grab as in claim 1 , 2, 3 and 4 characterised by that arms (3, 4) with profiles (5, 6) with elongated pivots (2) or welded on pivots with supporting plates (11) onto existing grab (1) are fitted .

Inventors: VAN DIETEN ALBERTUS JACOBUS GE, VAN DIETEN, ALBERTUS, JACOBUS, GERTRUDE, MARIA
Applicants: DIETEN ALBERTUS JACOBUS GERTRU, VAN DIETEN, ALBERTUS, JACOBUS, GERTRUDE, MARIA
Application year: 2001
Main classification: B66C1
IPC codes: B66C1