Static molds – In situ construction engineering type or building type-mold... – Forming building structure
Patent
1991-05-17
1992-07-28
Woo, Jay H.
Static molds
In situ construction engineering type or building type-mold...
Forming building structure
249 8, 249208, E04G 1306, B28B 722
Patent
active
051335301
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to casting equipment for production of stairways or staircases of concrete, and more particularly to an adjustable casting mold for production of stairways having various lengths, climbing heights, and number of dimensions of separate steps of the stairway.
In order to meet specifications for stairways for different individual building constructions, the building industry substantially has been required to have available a large number of different casting molds, a situation which obviously is rather cumbersome and expensive, among other things due to storage space requirements. Frequently it occurs that available casting molds do not have the specifications required for a particular construction, such that special casting molds still must be made, either in a factory or at the building site.
There are a number of known proposals for adjustable casting molds for casting stairways of concrete, but such known designs hitherto have not been very successful, partly because the constructions have been rather complicated and cumbersome both in construction and use, especially because the possibilities for adjustment have not proved to be sufficient. Illustrative prior art systems are disclosed in German Patent No. 35 18 200, German published Patent Application No. 21 55 577 and No. 24 07 871, French Patent No. 2 332 685 and Swedish Patent No. 425 572.
SUMMARY OF THE INVENTION
The casting mold in accordance with the present invention provides, in spite of a relatively simple construction, possibility for a very large number of adjustments, such that it is possible to produce stairways and staircases which meet substantially about any and all different specification requirements. With a pair of manual adjustments it is possible, in a stepless manner, to adjust the length, climbing height, number of steps and dimensions of upsteps and insteps of the stairway.
The casting mold in accordance with the invention is generally characterized by the following features: longitudinal supporting elements, on the supporting frame and are pivotally linked together in a scissors-like manner at points of overlapping intersection of arms of the systems crossing a longitudinal center line of the systems, step units in such fashion that the step units can undergo vertical pivotal movement, right angle, link arm systems, thereby simultaneously adjusting the distance between adjacent step units, and means for adjustment of the angular position of the step units relative to the supporting frame.
With a casting mold in accordance with the invention it is possible by means of two simple separate adjustments to accomplish a stepless adjustment of the length of the stairway and the position of each step unit. By such adjustments it also is possible to define the number of steps required in the stairway to be built, the climbing height of the stairway as a whole and the climbing height of each upstep of the stairway.
Through simple adjustments it also is possible to adjust the depth of the insteps of the stairway.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention shall be further described with reference to the accompanying drawings which in detail illustrate an embodiment for a casting mold in accordance with the invention, and wherein:
FIGS. 1 and 2 are a lateral view and a plan view, respectively, of a casting mold in accordance with the invention;
FIG. 3 is an end view seen from the left side of the mold as shown in FIG. 1 and on a somewhat enlarged scale;
FIG. 4 is a detailed lateral view on a further enlarged scale and which illustrates the construction of steps or step units and the function thereof;
FIG. 5 is a fragmentary sectional view along plane V--V in FIG. 1 which illustrates on an enlarged scale, a right half part of the mold and which especially illustrates a side part of the mold and the adjustment of the width of the casting mold and a stairway made thereby; and
FIG. 6 is a fragmentary side view along plane VI--VI in FIG. 5.
DETAILED DESCRIPTION OF THE INVENT
Nguyen Khanh P.
Woo Jay H.
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