DE3153240C2 - Controllable piston/cylinder unit which is attached onto the load-bearing means of a crane and intended for manipulating masonry blocks - Google Patents

Abstract

Published without abstract.

Description

The invention relates to a load bearing means a crane connected in the vertical direction, hydraulically controllable piston-cylinder unit for Manipulating a grab bar used to hold a row of adjacent bricks.

With a piston-cylinder unit of this type {cf. the Fig. 3 of US Patent 25 54 433) is only a cylinder space for the supply and discharge of the Fluids available. For this reason, an additional container and a pump or the like must be arranged, so that there is a considerable weight. The control means for the vertically arranged piston-cylinder unit are located directly on the gripping bar, which means that not only is a relatively long line for the Fluid is required, but overall a relatively complicated construction is created.

The invention is therefore based on the object of designing a controllable piston-cylinder unit of the type described at the beginning in such a way that it is of simple construction and therefore light, so that an exactly targeted and slow setting of the row of bricks, e.g. B. also ■■ by means of a small crane, is guaranteed on a prepared mortar bed.

This object is achieved according to the invention by what is stated in the characterizing part of claim 1 Features solved.

The claimed training has the advantage that no pump is required for the fluid, because the return spring, which is of course dimensioned accordingly, pulls the piston after it has been set down of the brick row in the upper starting position, with fluid from the upper cylinder chamber into the lower cylinder chamber flows

Advantageous configurations are the subject of claims 2 to 4.

The invention is described in detail below with reference to an exemplary embodiment shown in the drawing described. It shows

ίο Fi g. 1 the side view of a small crane with a to hold a row of bricks serving gripping bars, with the interposition of a controllable Piston-cylinder unit is attached to the lifting gear of a Larttragemittels, and

F i g. 2 the controllable piston-cylinder unit in detail.

The small crane shown in the drawing - which is not the subject of the present invention - serves essentially to lift a number of bricks 36 and to put them on in packets Brick row on a previously applied mortar bed on a wall. To precisely regulate the lowering speed of the gripping bar 8 immediately before the row of bricks 36 is placed To enable a mortar bed is a controllable piston-cylinder unit 35 between the lifting gear 6 of the load carrying means 7 and the gripping bar 8 are arranged. The unit 35 has a cylinder 37 with a Cover 38 and a base 39 and a piston 40 through which the cylinder 37 in an upper cylinder space 41 and a lower cylinder space 42 is divided and to which a rigid piston rod 43 is connected is. The piston 40 is connected to the cylinder cover 38 by a return spring 44. Furthermore, the two cylinder chambers 41 and 42 via a throttle or lockable by means of a spring-loaded valve 45 Bridging line 46 connected to one another. The valve 45 is acted upon by a return spring 47, manually operated control lever 48 attached

arranges. In addition, a return line 49 branching off from the bridging line 46 is provided, in FIG which a check valve 50 is switched on. An eyelet 51 is connected to the cylinder cover 38, in soft the load hook of a lifting gear 6 engages. At

the piston rod 43 of the piston 40 is connected to an eyelet 52 on which the gripping bar 8 is suspended is. When the piston-cylinder unit 35 is in operation, the gripping bar 8 with the bricks can be lowered 36 the bypass line 46 can be opened more or less wide by means of the valve 45, so that the Piston 40 displaced by the weight of the attached parts, oil from the cylinder space 42 and this through the valve 45 throttled in any way overflows into the cylinder chamber 41, whereby an extreme slow lowering of the bricks 36 is guaranteed. After relieving the piston 40 by hanging off the Bricks 36, the piston 40 is pulled back into its upper starting position by the return spring 44, whereby this from the upper cylinder

The room 41 displaced oil via the return line 49 - flows back into the lower cylinder space 42.

For this purpose 2 sheets of drawings

Claims (4)

Patent claims: 1. Hydraulically controllable connected to the load-carrying device of a crane in a vertical direction Piston-cylinder unit for manipulating one for holding a row of adjacent ones Bricks used gripping bars, characterized in that the cylinder spaces (41, 42) of the piston-cylinder unit (35) by means of a bridging line (46) which can be regulated in its free cross section are connected to one another and that the piston (40) via a return spring (44) arranged in the upper cylinder chamber (41) on the upper cylinder cover (38) is attached 2. Piston-cylinder unit according to claim 1, characterized in that the free cross section of the Bridging line (46) can be regulated by means of a manually operated control valve (45), wherein the manually operated valve (45) in the closing direction is acted upon by a spring load. 3. Piston-cylinder unit according to claim 1 or 2, characterized in that the bridging line in a (46) with the lower cylinder space (42) of the cylinder (37) connecting the return line (49) a check valve (50) is switched on 4. Piston-cylinder unit according to one of claims 1 to 3, characterized in that the cylinder (37) and the piston rod (43) of the cylinder (37) are equipped with an attachment eyelet (51 or 52), with the load hook of the lifting gear (6) engages in the eyelet (51) of the cylinder (37) and in the eyelet (52) the piston rod (43) of the clamp bar (8) is attached.