Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Spacer-positioner; e.g. – rebar chair
Patent
1993-09-21
1995-03-28
Friedman, Carl D.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Spacer-positioner; e.g., rebar chair
52677, 52678, 52687, E04C 516
Patent
active
054005620
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/DE 93/00070, filed 25 Jan. 1993 and based, in turn, upon German national application G 92 01 584.0, filed 8 Feb. 1992, under the International Convention.
1. Field of the Invention
The invention relates to a spacer for reinforcement bars, such as may be required in concrete construction or in the production of prefabricated concrete components. Such spacers are necessary to ensure the required thickness of the concrete covering, because for the endurance of construction made of steel-reinforced concrete and prestressed concrete the thickness and compactness of the concrete covering are of decisive importance.
BACKGROUND OF THE INVENTION
As a rule, spacers for reinforced concrete consist of a base supported on the casing and a connection piece serving for attachment to the reinforcement bar. After the reinforcement for a concrete construction is finished, these spacers are fastened to the reinforcement bars along the outside of the reinforcement, so that the form boards to be positioned will have a preselected distance from the actual reinforcement element.
Such spacers have to meet a series of requirements. On the one hand, they should be cheap from the point of view of the material, as well as the manufacturing; on the other hand they have to be designed so that they can be quickly and securely fastened to the reinforcement rods by the reinforcement specialists, without the danger of their sliding or tilting during pouring.
2. Object of the Invention
It is the principal object of the present invention to provide an improved spacer for reinforcement bars which satisfies the requirements enumerated above and is free from drawbacks of earlier spacers.
SUMMARY OF THE INVENTION
According to the invention, such a spacer consists of a socket with a height corresponding to the desired distance of the bar from the face of the concrete body and a band-shaped clamping member which peripherally locks the reinforcement bar like a ring. The base has a threaded bore on its frontal side, while the two ends of the band-shaped clamping member are designed as parts of a screw with external threading fitting the threaded bore of the socket.
The handling of this spacer consisting of two parts is extremely simple. First the band-shaped clamping member which is already circularly preshaped is positioned around the reinforcement bar and its ends are pressed together by the reinforcement specialist. The base is then fitted over the screw resulting from the two ends of the clamping element which has been brought together and is screwed on until the spacer firmly encircles the reinforcement bar. Then the base is positioned so that its axis of symmetry is perpendicular with respect to the casing.
Considering the fact that in the course of producing a reinforcement for a concrete construction, the reinforcement specialists normally use steel-wire connections for the mutual support of neighboring reinforcement bars, the mounting of the spacers according to the invention proves to be a simple operation, which can be performed without the need for additional tools. The fitting of the clamping member on a reinforcement bar and its tightening with the base is an operation which can be performed easily and quickly.
The base itself can be produced as a body of plastic material through an injection molding process. The socket can also be cast in concrete and shaped with a hump at its frontal side opposite the threaded bore, so that at least three humps are defined in a plane running perpendicularly to its plane of symmetry.
Such sockets cast in concrete have the advantage that they can also be used in the production of exposed concrete, without influencing the appearance of the outer concrete surface.
An injection-molded hollow body made of plastic material or metal and provided with the threaded bore can be axially introduced into such a base cast in concrete. This can be done by casting this socket in a die wherein prior to the casting the hollow bod
REFERENCES:
patent: 2257421 (1941-09-01), Mabry
patent: 2867041 (1959-01-01), McMillan
patent: 3006115 (1961-10-01), Hillberg
patent: 4147008 (1979-04-01), Eisner
patent: 4575985 (1986-03-01), Eckenrodt
patent: 4655023 (1987-04-01), Yung
patent: 4835933 (1989-06-01), Yung
Dubno Herbert
Friedman Carl D.
Wilkens Kevin D.
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