US3788494A

US3788494A - Apparatus to facilitate the extraction of a room form

Info

Publication number: US3788494A
Application number: US00227835A
Authority: US
Inventors: W Markewitz; F Mischke
Original assignee: Huennebeck GmbH
Current assignee: Huennebeck Deutschland GmbH
Priority date: 1971-02-25
Filing date: 1972-02-22
Publication date: 1974-01-29
Anticipated expiration: 1991-01-29
Also published as: SU430561A3; FR2127722A5; DE2108815B2; DE2108815A1; JPS5224338B1; DD95457A5; BE778396A; GB1373166A; ZA72717B; DE2108815C3

Abstract

An apparatus to facilitate the extraction of a room form which comprises a frame for carrying said room form, said frame carried on a two-axled dolly and being pivotable with respect to said dolly.

Description

ite a-tent 1 Markewiti et al.

[ APPARATUS T0 FACILITATE THE EXTRACTION OF A ROOM FORM [75] I Inventors: Wolfgang Markewitz, Hilden; Fritz Mischke, Dusseldorf, both of Germany [73] Assignee: Fa. Hunnebeck GmhH, Lintor'f,

' Germany [22] Filed:

Feb. 22, 1972 21 Appl. No.: 227,835

[30] Foreign Application Priority Data I Feb. 25, 1971 Germany 2108815 [52] U.S. C1 214/1 H, 52/122, 249/36, 425/62 51 Int. Cl. B66c 1/10 [58] Field of Search 425/62, 63; 249/27, 33, 36; 214/1 D, l H; 52/122, 741

l 1 1 .lan. 29, 1974 Primary Examiner-Frank E. Werner Attorney, Agent, or Firm-Ralph D. Dinklage et a1.

[57] ABSTRACT An apparatus to facilitate the extraction of a room form which comprises a frame for carrying said room form, said frame carried on a two-axled dolly and being pivotable with respect to said dolly.

8 Claims, 8 Drawing Figures PMENIEUJAH 29 1574 SHEET 1 BF 5 PATENTEUJAN 29 m4 SHEET 3 OF 5 PATENTED JAN 2 9 I974 SHEET Q 0F 5 PMHEM imaam .SHEET 5 BF 5 APPARATUS TO FACILITATE THE EXTRACTION OF A ROOM FORM BACKGROUND-OF THE INVENTION DISCUSSION OF THE PRIOR ART For the extraction of a room form from a portion of a building that has been made by means of a form a hooklike device is presently being used. For such device generally a crane hook is used. The hook-like device is suspended from the crane hook and reaches under the upper part of the form. Such devices are relatively heavy and correspondingly expensive. Thus, it has become desirable to provide a means which will carry the form for use in poured concrete construction, which device can readily be removed after the concrete has set. l I

It is an object of this invention to provide a less expensive apparatus than heretofore utilized to facilitate the extraction of the room form. More particularly, it is an object of this invention to provide a means for carrying such a room form which, through the use of a dolly and a height adjusting frame, can readily be removed from the room defined by the concrete walls.

SUMMARY or THE INVENTION Broadly, this invention contemplates an apparatus to facilitate the" extraction of a room form which comprises a frame for carrying said room form, said frame carried on a two-axled dolly and being pivotable with respect to said dolly.

Inaccordance with this invention, there is provided an apparatus which facilitates the extraction of a room form used in poured concrete construction. The apparatus comprises a frame, preferably a height-adjusting frame, carried on a two axled dolly..The frame is pivotable with respect to the dolly. The dolly comprises two wheels, to one of which is affixed a supporting means having a flat bottom disposed a'distance above the tangential plane joining the wheels of the dolly on its bottom. The purpose of the supporting means is to provide support for the frame and the form carried thereon during extraction of the apparatus from the area within freshly poured and set concrete. Generally, the supporting means has a high coefficient of friction with re spect to concrete and can suitably be a block of wood disposed angularly from one of the wheels, i.e., the wheel first withdrawn from the room.

The dolly comprises two beams which are joined or articulated at an axle of one of the wheels of the dolly. The beams are preferably constructed such that one beam carries a socket which supports the frame of the apparatus. The other beam connects the two axes of the wheels of the dolly. Preferably, the beams form an angle which is variable whereby the height of the entire frame can be regulated. In a preferred embodiment of the invention a hydraulic cylinder is utilized containing a connecting rod connected to an upper end of the beam'carrying the socket. Actuation of the hydraulic cylinder raises and lowers the beam with respect to the dolly and thus raises or lowers the frame carried in the socket.

In a particularly desirable embodiment, the invention comprises a frame having a generally flat top member supported by generally vertical angularly disposed struts carried in the socket, in turn carried by one of the beams articulated to an axle of one of the wheels of the dolly. The frame member and dolly can be utilized together with a second frame member and dolly by disposing the same in general alignment and providing a connecting means between the generally flat members as more fully disclosed below.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show a preferred embodiment of the invention.

FIGS. 1 to 4 are side elevations showing the apparatus in four different working positions;

FIG. 5 is a sectional view taken along line V-V of FIG. 1;

FIGS. 6 and 7 show an enlarged scale of the lower part of the apparatus in three different positions.

FIG. 8 is a view similar to FIGS. 6 and 7 showing the small front wheel 12 removed from the room, the support member or block 13 in supporting position and wheel within the structure.

DESCRIPTION OF SPECIFIC EMBODIMENT The illustrated apparatus of the invention consists of a dolly 1 having a socket 5 holding the lower ends of

struts

2,3, whose upper ends are attached to a horizontal supporting frame 4. Parts 2 to 5 form a frame for carrying the room form.

The dolly 1 consists of two beams 7 parallel to one another and a beam 8 disposed between these beams, the socket 5 being fastened to beam 8 by means of a pivot pin 6.

Beams

7 and 8 are joined together at their one end by an axle 9 on which a wheel 10 is mounted. The other, forward ends of the beams 7 are joined together by an axle 11 on each of whose ends there is mounted a wheel 11. Wheels'l2 have a smaller diameter than wheels 10. Between the two beams 7, there is a support member or block 13 of another material having a high coefficient of friction in relation to concrete, such as wood, for example. This block 13 is carried by a plate 14 which is affixed to the beams 7. The plate 14 bears a hydraulic cylinder 15 having a piston whose connecting rod 16 is joined to the front end of beam 8 by a pin 17. v

v The

beams

7 and 8 enclose an angle a as seen in FIG. 6. This angle can be between and This angle can be diminished by means of the hydraulic cylinder 15 thereby lowering the

supports

2 and 3 together with the supporting frame 4. FIGS. 7 and 8 show the beam tical part a of the room form. Each of these parts a and consists of a plate whose smooth front side faces the concrete to be formed and has ribs r on its rear side. Part a, constitutes the form for one half of the roof e, and part a constitutes the form for a wall f. To provide a form for two walls f and the entire room e between these walls f, two such room forms are provided, as shown in FIG. 5. Accordingly, two dollies 1 are provided, each of which bears a supporting frame 4. These two supporting frames are joined together by a connecting piece m. The dollies roll on the previously made roof e.

To set up such room forms, the supporting frames are first lowered. The vertical form parts a are on jacks b, the horizontal form parts a lie on the supporting frame 4 and the connecting piece m which joins them together. Then by means of the cylinders the supporting frames 4 and hence the form parts a are lifted, and by means of the jacks b the form parts a are raised to the same extent. After the concrete roof and the concrete walls f have been made with this room form, the room form is lowered by means of the cylinders 15 and the jacks b. The vertical form parts a are backed off slightly from the walls f, by hand for example. Then a cable hanging from the crane hook h is fastened to an outwardly projecting work scaffold, which also serves for protection, and with it the room form is lifted slightly from the floor c as seen in FIG. 1. By moving the crane in the direction of the ar'r'ow P, the entire room form, whose rearward end runs on the two dollies 1, can be extracted from the shell between the floor c and the roof e, see FIG. 2.

As soon as wheel 12 passes over the front edge e of the floor c, the dolly l tilts by the angle [3, whereupon the support member or block 13 lies on the top of floor c and thus prevents any further movement of dolly l as seen in FIGS. 3 and 8. If the crane hook h is then low ered, the rear end of the form part a can engage the roof e (FIG. 3). The room form in this position is secured against dropping out of the building. Then the room form is attached to a cable i hanging from crane hook h such that it is suspended horizontally when the crane hook h is lifted (FIG. 4). By moving the crane in the direction of the arrow P it can easily be removed from the building as seen in FIG. 4.

The terms and expressions used herein are terms of illustration and not of limitation, as there is no intention, in the use of such terms and expressions, of excluding any equivalents or portions thereof, as various modifications and departures from the specific embodiment shown above are possible within the scope of the invention claimed. For example, it is apparent that both wheels of the dolly could be of the same size. A single frame member can be constructed having a pair of wheels on either size thereof and a frame member, the top member of which can have a size sufficient to cover an entire ceiling. Additional support members or struts can be used and frame systems comprising a plurality of such dollies supporting top members of substantial length can be utilized. It is even possible to provide a mechanized dolly system which supplies power to the wheels of the dolly to facilitate disposition of the dolly in the building and withdrawal of the dolly and frame. including the room forms after the poured concrete has set.

What is claimed is:

1. An apparatus to facilitate the extraction of a room form comprising a horizontal part and a vertical part which apparatus comprises a frame forcarrying said room form, said frame carried on a two-axled dolly having at least two wheels, said dolly being pivotable with respect to said frame, said frame being heightadjustable in relationship to said dolly, to one of the wheels of said dolly a supporting means being affixed having a flat bottom disposed a distance above the plane on which said wheels may run, whereby the supporting means contacts the said plane when the wheels on the axle leading in the direction of the extraction of the form fall below the level of said plane to cause pivoting of the dolly with respect to the frame to thus arrest the extraction of said dolly, frame and form.

2. An apparatus according to claim 1 wherein said dolly comprises two beams articulated together at the axle of one of the wheels of said dolly, one of said beams pivotally carrying a socket supporting said frame and the other of said beams connecting the axle of one of said wheels to the axle of the other of said. wheels.

3. An apparatus according to claim 2 wherein there is provided means varying the angle between said beams whereby to raise or lower said frame.

4. An apparatus according to claim 3 wherein said means comprises a hydraulic cylinder and a connecting rod connected to the upper end of the beam carrying said socket, said cylinder disposed therebeneath.

5. An apparatus according to claim 3 wherein the wheel disposed about the axle where said beams are articulated is larger than the other of said wheels of said dolly.

6. An apparatus according to claim 1 wherein said supporting means comprises a block of a material of high coefficient of friction in relation to concrete.

7. An apparatus according to claim 1 wherein said supporting means comprises a block of a material of high coefficient of friction in relation to concrete which block projects angularly downwardly from the smaller wheel toward the larger wheel.

8. An apparatus according to claim 7 wherein said frame comprises a generally horizontal top member supported by a pair of generally vertical angularly disposed struts, the lower ends of which are carried in said socket.

Claims

1. An apparatus to facilitate the extraction of a room form comprising a horizontal part and a vertical part which apparatus comprises a frame for carrying said room form, said frame carried on a two-axled dolly having at least two wheels, said dolly being pivotable with respect to said frame, said frame being heightadjustable in relationship to said dolly, to one of the wheels of said dolly a supporting means being affixed having a flat bottom disposed a distance above the plane on which said wheels may run, whereby the supporting means contacts the said plane when the wheels on the axle leading in the direction of the extraction of the form fall below the level of said plane to cause pivoting of the dolly with respect to the frame to thus arrest the extraction of said dolly, frame and form.

2. An apparatus according to claim 1 wherein said dolly comprises two beams articulated together at the axle of one of the wheels of said dolly, one of said beams pivotally carrying a socket supporting said frame and the other of said beams connecting the axle of one of said wheels to the axle of the other of said wheeLs.