FI65728B - BETONERINGSKASSETT - Google Patents

Description

65728

CONCRETE CASTING CASSETTE - BETONERINGSKASSETT

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The invention relates to a concrete casting cassette as defined in the preamble of the claim.

Concrete casting cassettes with a heating device are already known from Finnish patent application 1788/73 and from application and patent publications CH-419 553, DE-2 061 394, DE-2 249 401 and US-3 649 724. These known solutions have the disadvantage that that when attaching a new surface plate instead of or on top of a previously damaged pin plate, e.g. by nailing, nails penetrating through the pin-10 plate cause a short-circuit hazard in the actual heating element. This shortcoming has not been combated. In addition, known concrete casting cassettes with electric heating devices (e.g. disclosed in CH-419 553) are heavy and cumbersome to use.

It is an object of the present invention to obviate the above drawbacks. In particular, it is an object of the invention to provide a concrete casting cassette in which the nailing of a new surface plate does not cause a short-circuit hazard or other damage to the electric heating element.

For aspects of the invention, reference is made to the claim.

The invention eliminates the above drawbacks and discloses a new type of concrete casting cassette, in which a nailing protection 25 protects the electric heating device when performing nailing, e.g. to a cassette surface plate made of plywood.

The casting cassette according to the invention, like conventional casting cassettes, can be connected to other casting cassettes to form any concrete casting molds, and the casting cassette can be provided with a fastening opening for pipe fastening or other fastening devices or members known to a person skilled in the art.

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The invention will now be described in detail with reference to an exemplary embodiment with reference to the accompanying drawing, in which Figure 1 shows an end view and a section of a concrete casting cassette according to the invention, and Figure 2 shows a concrete casting cassette according to Figure 1 seen from its rear.

Figures 1-2 show a concrete casting cassette 1 according to the invention for a concrete casting mold. The casting cassette 1 consists of a frame beam 3, 17 (the beam beams 3 are shown in Fig. 2) and a surface plate 2 attached thereto. The frame beam comprises two longitudinal edge beams 17 of the cassette and frame beams 3 connected at right angles to the edge beam. flanges 11 connected by the web 20 in parallel and at a constant distance from each other. The ends of the frame beams 3 (Fig. 2) are arranged between the flanges 11 on each side of the cassette and fastened to the edge beam from said flanges by fastening screws 20 12. The surface plate 2 is fastened to the edge and frame beams 17, 3. To the flange part of the I-profile with fastening screws 13 between a spacer plate or strip 4 placed between the frame beams and the surface plate. In the embodiment shown, the frame beam 25 3 is covered behind the thermal insulation 18; the fixing screws 12 are partially shown. The casting cassette 1 has a rectangular shape, and the edge beams 17 are provided with e.g. mounting holes 25 or members for connecting the casting cassette to the second or other casting cassettes to form a concrete mold, as is known to a person skilled in the art.

According to the invention, the concrete casting cassette shown in Figures 1-2 comprises an electric heating device 6 for heating the casting cassette. The electric heating device consists of a resistance wire arranged to run from edge to edge of the casting cassette 1 35 in its width direction over the substantially longitudinal direction of said casting cassette, as shown in Fig. 4. If desired, several resistors connected in series 3,65728 and / or in parallel can be used. The electrical conduit is suitably equipped with thermostats to keep the heater temperature within the desired range. The heating device 6 is provided with a junction box 16 and a protective housing 23, 5, the former of which includes e.g. RCD, tuning and test buttons with signal lamps and sockets, the latter comprising a connecting cable storage housing (shown in Figure 2).

The casting cassette shown in Fig. 1 comprises an outer surface plate 2, suitably made of plywood, under which a nail guard 26 is placed, such as a steel plate to protect the electric heater 6 located behind the nail guard from damage caused by nails penetrating through the surface plate. Viewed from the plate 2 of the pin-15, a heat-reflecting surface 7, such as aluminum foil, is placed on the rear side of the electric heating device 6, and behind it an actual thermal insulation 18, such as a styrofoam, polyurethane, rock wool or similar insulating plate.

Figure 1-2 shows the housing spaces 27 formed on the inside of the edge beams 7 between the frame beams 3, which open at the rear of the casting cassette and have free access to the edge beams inside to connect the cassette to another cassette by means of fasteners fitted through the beams. A back plate 9, e.g. a plywood plate, is attached to the back surface of the casting cassette 1.

The structure of the electric heating device 6 can vary considerably. It can consist of e.g. a conventional resistance wire, an electric heating cable, an electrically operated regulated heater, as used e.g.

30 in connection with ceiling, wall or floor heating of residential buildings, etc. from a heating device based on the thermal effect of electricity.

The working examples are intended to illustrate the invention without limiting it in any way.

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