Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se
Patent
1991-05-15
1992-12-08
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
156245, 249 48, 249 51, 249112, 2491141, 249115, 249134, 249135, 249139, 249143, 249164, 264 31, 264313, 264316, 264333, 264334, 264337, 264338, B28B 734, B28B 736, B29C 3320, E04B 116
Patent
active
051695855
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a process and a device for the manufacture of posts of concrete or the like, of polygonal cross section.
It is known that the preparation of concrete structural elements involves the use of forms of wood or metal in which the concrete is poured and where it is left to harden. These forms are expensive and heavy and difficult to handle. Furthermore, on the worksites the operations of setting and stripping forms are often difficult.
In the case of simple pieces such as posts, it has already been proposed to cast the concrete in simple cardboard sheaths. The tests performed for posts of circular section have proven perfectly satisfactory, and this process is now employed in the art. It offers the advantage of being very easy to employ and of being much less expensive than the ordinary methods using complex forms.
Despite these advantages, it has not been possible, however, to apply this process to the production of posts of polygonal (square, rectangular or other) cross section, for in every case the cardboard sheath used deforms by sagging to assume a circular or rounded section.
To remedy this problem, it has been proposed, in FR-A-1 453 489, to make use of a cardboard form of polygonal section, which is reinforced by applying boards to its external faces, these boards being held in position against the faces of the form with the aid of clamps.
GB-A-648,809 has also proposed using for this purpose a form of polygonal section constituted by a plaster panel gripped between two carboard boards, this panel having parallel folding lines enabling it to be folded to form a liner which is externally sheathed in a protective sheet of paper, fabric, leather etc.
All these processes, however, are expensive and difficult to employ.
The present invention aims to remedy this problem by proposing a process for making concrete posts of polygonal cross section that will be as easy to employ as the cardboard sheath process used for the manufacture of posts of circular section, that will not be more expensive than the latter, and which will use, for the pouring of the concrete and for setting it, not a wooden form but a simple liner which does not deform.
SUMMARY OF THE INVENTION
The subject matter of the invention is a process for making posts of concrete or the like of polygonal cross section, characterized in that the concrete is poured and allowed to set in an integral liner in the shape of a right prism, having an internal section identical to that of the post, this liner being duplexed externally on all its faces to backing panels of a rigid or semi-rigid material which cover the said faces, and at least one of which adheres to an external face of the liner, the liner and the associated backing panels being held together in contact with one another, in the position of use, by hooping means or the like.
The invention also has as its subject matter a device for making posts of concrete or the like, of polygonal cross section, characterized in that it includes an integral liner in the form of a right prism having an internal section identical to that of the post, backing panels of a rigid or semi-rigid material adapted to be applied against the external faces of the liner to cover them on their entire surface, one of which adheres to one external face of the liner, and hooping means or the like adapted to hold the liner and the associated backing panels in contact with one another during the employment of the device.
The posts of concrete or the like of polygonal cross section made by the process or with the aid of the device defined above constitute another subject of the invention.
The liner used can be of cardboard, plain or corrugated, treated if desired with any means known in itself, of special cardboard including flat cover sheets of cardboard between which is interposed at least one armature other than a corrugated sheet, or again, a plastic material such as polyethylene, an expanded high-density plastic material, rotary-cut wood veneer, or the like.
Ad
REFERENCES:
patent: 971554 (1910-10-01), Parsons
patent: 1171491 (1916-02-01), Woods
patent: 2505426 (1950-04-01), O'Flaherty
patent: 2991533 (1961-07-01), Reid et al.
patent: 3329747 (1967-07-01), Veach
patent: 3350049 (1967-10-01), Reiland
patent: 3479704 (1969-11-01), Reed
patent: 3831898 (1974-08-01), Sachs
patent: 3942753 (1976-03-01), Sachs
patent: 3964944 (1976-06-01), Gwynne
patent: 4023766 (1977-05-01), Lubov
patent: 4083526 (1978-04-01), Hatfield
patent: 4147818 (1979-04-01), Hatfield
patent: 4595168 (1986-06-01), Goodwin
patent: 4842241 (1989-06-01), Fitzgerald et al.
patent: 4887789 (1989-12-01), Harris et al.
patent: 4957270 (1990-09-01), Rummage et al.
LandOfFree
Method and device for fabricating posts made of concrete or the does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and device for fabricating posts made of concrete or the , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for fabricating posts made of concrete or the will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-959356