Static molds – Container-type molding device – And an inner removable core to form recess or opening
Patent
1992-10-05
1994-10-25
Housel, James C.
Static molds
Container-type molding device
And an inner removable core to form recess or opening
249 9, 249 52, 249101, 249119, 249131, 249151, 249176, B28B 300
Patent
active
053582144
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a mold for concrete modular precastings comprising a bottom and containment side walls.
DESCRIPTION OF THE PRIOR ART
Molds for such precastings are known in which there are fixed strips adapted to form in the concrete precasting slots or other types of void space. Nevertheless, in the regularly known molds, stripping of the part from the mold causes serious problems, since the adherence thereof to the mold itself and to the said strips causes stresses to be formed in the precastings capable of causing a serious deterioration thereof. Independently of the above, mold stripping in the usually known systems requires a relatively long time.
SUMMARY OF THE INVENTION
It is an objective of the invention to provide a mold in which the drawbacks mentioned in the foregoing paragraph are overcome, namely, one which does not cause the said stresses and involves a shorter time.
This objective is attained by a mold of the type described at the beginning which is characterized in that in said bottom there are to be found a plurality of grooves extending transversely between both sidewalls, there being in said sidewalls windows the passage of which is an extension of the groove.
Preferably according to the invention, each groove is delimited by facing faces of respective fillets fixedly attached to the mold bottom and which are arranged spaced apart and parallel to one another.
According to another preferred feature of the invention, the dimensions of the window, perpendicular to the mold bottom, is greater than the depth or dimension in like direction of the groove.
In a development of the invention, the mold comprises strips adapted to engage in said grooves and these strips have a height greater than the depth of the grooves and are longer than the grooves and project out through the windows.
In a further development of the invention, said strips have a height smaller than the dimension of the windows in a direction perpendicular to the bottom of the mold, whereby they are adapted to move in said direction between a lowered position in which they rest against said bottom and a raised position in which they engage the upper profile of the window.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages and features of the invention will be appreciated from the following description in which one preferred embodiment of the invention is described as a non-limitative example, with reference to the accompanying drawings, in which:
FIG. 1 is a part perspective view of the mold of the invention, with one side wall folded down.
FIG. 2 is a part perspective view of the mold, showing a strip in the raised position.
FIG. 3 is a perspective view of a section of the mold on a longitudinal plane.
FIG. 4 is a partial elevation view of the mold having a through slot and a rule inserted therethrough.
FIG. 5 is a partial schematic showing a strip and a spacer.
DETAILED DESCRIPTION OF THE INVENTION
The mold 2 of the present invention is for concrete modular precastings. The term modular is intended to describe fabricated pieces containing repeats of a module of certain dimensions and a module may consist of a piece independent from another module or two consecutive modules may be separated by a slot or the like.
The mold 2 is generally made of metal and comprises a bottom 4 and containment side walls 6, which may be folded down as shown in FIG. 1, although this is not the most frequent situation. The mold 2 may be of substantial size in the longitudinal direction, whereby a very large piece or a piece comprising a high number of modules may be formed. The side walls 6 do not of necessity define a straight line, but may have an appropriate form to allow the production of pieces of various shapes, such as hexagonal and the like.
According to the invention, the bottom 4 is formed with grooves which may be through slots (FIG. 4); they may consist of a recess formed in the bottom; or, preferably, the grooves 8 may delimited by the facing faces 10 of spaced apart, parallel f
REFERENCES:
patent: 1596179 (1926-08-01), Heltzel
patent: 1948213 (1934-02-01), Heltzel
patent: 2674960 (1954-04-01), De Pasquale
patent: 3273205 (1966-09-01), Hanley
patent: 4198176 (1980-04-01), Bentz
patent: 4533111 (1985-08-01), Cousin et al.
Housel James C.
Pyon Harold
LandOfFree
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