The present invention refers to a construction which from a fixed se¬ curing point may support and cover circular surface to 100% depending upon kind of securing method to its fixed support point.

5 Primarily constructed to be flexible support construction for pivot- t able concrete distribution tube which via concrete pump feeds concrete mass through tube system to this distribution cantilever device.

The device has a flexible constructive construction method which makes it suitable and adaptable to a plurality of uses. The principle should

10 also be possible to use for blowing of loose leca material or the like which is fed via tube set-up to be evenly spread over large surfaces. The device diso seems to be suited for the reverse condition that one should have the possibility of cover a circular surface In order to create a flexible system for evacuating or absorbing by using vacuum

15 In tube or hose system which is placed upon the cantilever device. In such a method it is convenient that a control unit for pivot functions Is mounted for inner and outer part respectively and that said functions are given a remote control.

Primarily the device is in this case designed for use in concrete hand- 20 ling with the aim or ergono lcal ly and technically facilitate very heavy and from the view of work damage highly loaded work.

Further it has not been possible to find in the market a construction of similar kind to accomplish this distribution function without loading the ground, and further no one which manages considerable large surfaces 25 without the necessity of a continuous movement during the casting cycle.

To eliminate inconvenient high industrial injury consequences which have been a consequence of several earlier systems, which have implied that the heavy concrete mass in order to receive smoothness in the laying phase has been the object of a heavy movement by manual handling.

30 The system is adaptable for tier of beams, vertical support joists as well as floor-laying works. With this oenstruction considerably large surfaces may be evenly treated and easily be carried flexibly over the entire surface which has to be covered with the concrete mass.

By the fact that the mounting of the device is carried out upon a fixed construction free from the surface which is to be covered it is possible to obtain a distribution of the concrete mass over 100% of the circular working area within the diameter of a straightly extended distribution tube without the need of moving the device.

In order to easily control the device an inner locking function is attached to its securing point to fixed construction part and an outer locking function at the pϊvotable hinge of the device. The attendant may control these two locking functions by means of controls at the distribution dis- charing of the device and he can also choose if he wishes that any of the parts should be in a locked posi ion.

In order to control the process in an easy manner for the attendant a re¬ mote control unit is connected mounted to control the flow of the concrete mass through the concrete pumping tube. In this manner one man has control over the entire laying process from a stationary or mobile concrete pumping unit until the concrete mass has been distributed over a planar surface or to a vertical support framwork which has been Intended. The invention is characterized in (fig. 1) an inner cantilever part which at the lower part thereof is secured to a fixed suspension point (1) which constitutes an inner vertical pivot centre (A), in the upper part of the cantilever, ver¬ tically above a lower securing (3) which constitutes a control function and side stabilizing of the inner torsionally stable cantilever.

At the two 90 elbows of the overlying concrete tube (fig. 1 + 2) an outer pivot centre (B) is obtalne ^' d. Aligned with (B) vertically upwardly directed support (14) and in the same line downwardly directed support stud (5) which passes through support plates (6) from outer and (7) from Inner cantilever with a torsion stabilizing effect. The same guide stud (5) passes through an outer balancing cantilever part (8) and constitutes a suspension point (9) therefor. To one side of the outer pivotable cantilever member (8) there is applied a counterweight (10) which balances the con¬ crete tube (11) provided at the opposite side of the outer pivot centre (B) inclusive moments which are generated. This counterweight unit (10) may be fitted with a telescopic function in balance beam (8) it It should be more flexible without the need of changing the weight and instead be adjusted by changing the distance of the counterweight unit to the pivot centre (B) into a balance position.

Vertically above the two inner attachment points (1) and (3) aligned with the inner pivot centre (A) there is provided an adjustable stay function (12) in attachment point (2) is drawn to the outer end of the inner cantilever which managaes the spanning of the inner cantilever member such that the attachment (3) of the cantilever will be unloaded and will be a stabilizing and supporting function. From the same inner attachment point (2) an adjustable stay (13) is provided to the upper end of an up¬ wardly directed support (1*0, pivotable about this point (15) this stay (13:2) is extended to the outer end of the outer distribution tube (11) and is secured.

At the extension of the outer tube (11) there is attached from point (15) to the outer part of the extension tube a stay function (16) and further stay function (17) for further extension tubes when needed being adjusted or the conterwelght at the opposite side of the outer pivot centre (B) increased such that moments of extension tubes inclusive concrete is balanced. By extreme lay outs of the outer tube member a support rail (18) or support wheel (19) are provided under the outer extension tube. In order to obtain flexibility and a wider range of use with varying outlay radius a frame section is provided as an extension of the inner part of the inner cantilever. The sections are made according to the same principle as the main cantilever by a welfed frame construction of welded square steel tube profiles which are bolted to joint. At the same time the overlying pump tube and the stay functions (12) and (13) are extended with the extension member of a corresponding section. The sections for extension are fitted with a height as that of the main cantilever and has the same attaching principle to a stationary construction which is a cantilever carrier. These sections are preferably fitted to even 1,2,3 meters and so forth. The same standard for concrete pumping tubes and thus facilitates flexibility and accomodation to various sizes of treating surfaces. This lengthening possibility is of great importance at works where vertical support frames otherwise would present direct obstacles to the pivotabi 1 ity.

Fitting to a stationary construction member is preferably realized on angular cantilevers or a circular stationary column ore tube construc- tion is used it may be useful to arrange two pivotable cylinders which are threaded over the carrier, in which case stays (12) and (13) are secured centrical ly at the top thereof. In this case it may also be suit¬ able to provide at the opposite side of the cantilever about the pivot centre (A) fit a counterweight which balances the total mementum of the

device and so obtain a lower load at the support column or construction to which the device has been attached. In order to make it possible to manually move and assemble the device during floor laying works or the like in localities two pairs of wheels are used which are arranged, one pair (20) under the Inner cantilever and (21) under the outer pivot centre (B) which at the same time gives a steering possibility during movement. In order to be able mount the device without a lifting imple¬ ment the inner pair of wheels (20) may be spanned against the inclined inner frame towards the attachment point (1) to adjust height of the de- vice when assembled or disassembled. The correct position of the device is then adjusted by means of stays (12) and (13).

Other alternatives is to lift the device by means of blocks by assembly under joists or if there exists that possibility by means of crane during frame-work periods for joists and vertical support structures.

The device should also be possible to use by attaching an adapter on a digging machine or a tractor to facallitate in early foundations. An ad¬ vantage at less stable carriers of the device to diminish the loads can be to calibrate the overlying concrete distribution tube to a dimension inferior of that of the feeding conduit from the concrete pump.

The invention is not limited to the embodiment shown in the accompanying drawings and described but modoficatlons are possible within the scope of the following claims.

The essentϊla feature of the invention is that concrete mass under pressure for instance from a concrete pump may be spread over a wide and adjustable surface by means of a tube or a hose, which is suspended by means of a cantilever assembly which includes a first cantilever member, which is mounted about a vertical shaft and a second cantilever member which about a vertical shaft is pivotally mounted to the outer end of the first can- ti lever.

Said second cantilever member may preferably be telescopical and be balan¬ ced by means of counterweights or the like. Also the first cantilever member may of course by made adjustable. Both cantilever members are preferably braced by means of wires or the like. Since the pivot shaft for the first cantilever member may be spanned between floor and roof of a room the de- vice may also be used in small or to a great extent finished accomodations.