Static molds – In situ construction engineering type or building type-mold... – Forming building structure
Reexamination Certificate
1999-08-23
2001-07-10
Safavi, Michael (Department: 3635)
Static molds
In situ construction engineering type or building type-mold...
Forming building structure
C249S016000, C249S091000
Reexamination Certificate
active
06257545
ABSTRACT:
TECHNICAL FIELD
This invention relates to a mechanism for tentatively fixing decorative plates on a surface of a form for forming a concrete product in a method of adhering decorative plates such as wall stones, tiles and the like on the surface of the concrete product.
In particular, this invention pertains to a mechanism for tentatively fixing decorative plates which is suitable to use in a process for tentatively fixing decorative plates on a surface of a form in a method wherein form panels are used to constitute a form for a concrete product, decorative plates are tentatively fixed at least partially on surfaces of the form panels, concrete is filled inside the form, the tentative fixing of the decorative plates is released after the concrete is hardened, and the form panels are removed to obtain the concrete product having the decorative plates embedded therein.
BACKGROUND ART
Concrete retaining walls, building walls and other walls are sometimes covered with wall stones, tiles and other decorative plates for decoration and other purposes. As a typical method of placing decorative plates, it is known one in which decorative plates are tentatively fixed on a surface of a form for molding a concrete product, and concrete is poured into the form with this condition, whereby placing of the decorative plates are carried out at the same time when the concrete is hardened.
As a mechanism for tentatively fixing decorative plates on a form in the above method, there is known one that uses bolt and nut to tentatively fix the decorative plates on the surface of a form, wherein the bolt is removed after the concrete is hardened, and the nut is left as it is embedded in the concrete. For example, JP-A 62-59760 discloses such a mechanism for tentatively fixing a decorative plate.
The conventional mechanism for tentatively fixing a decorative plate, however, has problems as follows.
First, such decorative plates as a stone material and the like have sometimes a front surface which is a finished flat one, but have a back surface left uneven as it is when quarried. No problem may occur when bolt and nut or other tentative fixing means is used to tentatively fix a decorative plate one by one on a form panel. However, when a single tentative fixing means is used to tentatively fix four decorative plates on a form panel at one time as disclosed in the above-mentioned patent publication for the purpose that tentative fixing operation is carried out in a short time, there is a possibility that the four decorative plates are not properly fixed on the form panel because each decorative plates has a different thickness. If tentative fixing of the decorative plate on the form panel is not carried out securely, the decorative plate may fall off the form panel due to forces and vibration applied to the decorative plate when concrete is poured.
Second, when a bolt constituting the tentative fixing mechanism is removed after concrete is hardened, since the thread portion of the bolt is embedded in the concrete, the bolt cannot easily be removed, which is a problem.
Third, a decorative plate must be placed appropriately at a predetermined position when it is tentatively fixed on a form panel. If the decorative plate cannot be positioned effectively and easily, efficiency of its placing operation is degraged, which is not appropriate.
DISCLOSURE OF INVENTION
An object of this invention is to provide a decorative-plate tentative fixing mechanism which is able to ensure tentative fixing of a stone material and other decorative plates having a different thickness on a form panel.
An object of this invention is also to provide a decorative-plate tentative fixing mechanism in which tentative fixing of a decorative plate can easily be released after concrete is hardened.
Further, an object of this invention is to provide a decorative-plate tentative fixing mechanism in which positioning of each decorative plate can be carried out effectively when it is tentatively fixed on a form panel.
In order to achieve the above objects, according to this invention, a decorative-plate tentative fixing mechanism is constituted as follows. This mechanism is suitable for use in a process of tentatively fixing a decorative plate on a surface of a form panel, and the process is included in a method wherein form panels are used to constitute a form for molding a concrete product, decorative plates are tentatively fixed at least one part of surfaces of the form panels, concrete is filled inside the form, the tentative fixing of the decorative plates is released after the concrete is hardened, whereby producing a concrete product whose surface has the decorative plates embedded therein.
Namely, the decorative-plate tentative fixing mechanism of this invention comprises a tentative fixing means for pressing each decorative plate against the surface of the form plate to tentatively fix it thereon and a hole for attaching the tentative fixing means formed in the form panel. The tentative fixing means has a bolt, a nut, and a decorative plate holding member, wherein the bolt has a head portion and a leg portion formed with an external thread, and is inserted into the hole for attaching the tentative fixing means from a rear surface of the form plate, while a nut is screwed on a part of the bolt leg portion projected from the form plate, to thereby press the decorative plate against the surface of the form plate via the decorative plate holding member.
Further, the decorative-plate holding member is formed with a decorative-plate holding surface for holding the rear surface of the decorative plate, and the decorative-plate hiding surface is elastically deformable in a nut-screwing direction.
Furthermore, after concrete is hardened, only the bolt is removed, whereas the nut and the decorative plate holding member are left embedded in the concrete product.
Here, the decorative plate holding member may be constituted so that it has a hole-formed portion where a nut insert hole is formed, at least one arm portion extending from the hole-formed portion, and said decorative plate holding surface formed on the arm portion, wherein the decorative plate holding surface is located at a position projected toward a side of the form panel compared to the hole-formed portion.
The decorative plate holding member may also be one that has a plurality of said arm portions extending radially from the hole-formed portion as a center.
A typical shape of the decorative plate holding member is characterized in that the four arm portions are arranged cross-shaped, and the hole-formed portion is positioned on the center of these arm portions. With this shaped decorative plate holding member, four decorative plates can be tentatively fixed at the same time.
Thus, the decorative plate tentative fixing mechanism of this invention has the decorative plate holding member for pressing the decorative plate against the form panel to tentatively fix it thereon, wherein the decorative plate pressing surface of the decorative plate holding member is elastically deformable in a direction along which it approaches and leaves from the form plate. Therefore, even when the decorative plates whose thickness is different are tentatively fixed by a single decorative plate holding member, the difference in thickness among the decorative plates can be adjusted by elastic deformation of the decorative plate holding member. Thus, the nut is fully screwed to thereby fix each decorative plate on the form plate reliably.
Next, in addition to the above feature, the decorative-plate tentative fixing mechanism is characterized in that the leg portion of the bolt projecting from the surface of the form panel is substantially covered by the nut.
The nut having the above feature can be constituted as follows. Namely, the nut has an annular portion, a grip portion formed on one end of the annular portion, and a circular plate portion formed on an outer circumferential surface of the annular portion, wherein the annular portion is closed at the side of the grip portion and has a size capabl
Tokita Shuji
Yamada Fumiski
Burns Doane Swecker & Mathis L.L.P.
Safavi Michael
Soyu Co., Ltd.
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