Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Plural or complex apparatus
Reexamination Certificate
1998-03-20
2001-10-02
Crane, Daniel C. (Department: 3725)
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Plural or complex apparatus
C072S306000, C072S294000
Reexamination Certificate
active
06295857
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method for automatically bending the ends of profiled elements and the like, particularly rods for reinforced concrete, and to a machine for performing the method.
It is known that shaped rods, used for example to produce reinforced-concrete frames, are generally produced by means of devices which subject the rod, in coils or cut into bars, to an adapted plurality of bendings. These forming machines usually have at least one bending unit provided with a bending head which has a central pivot, an abutment and an eccentric bending pivot.
More particularly, bending machines are currently known which allow to produce, directly from coils of rod, a large number of different products, such as open or closed stirrups, circular or polygonal spirals, straight bars and the like. These machines conveniently have a plurality of elements for straightening and feeding the rod, a unit for cutting the rods to be bent and one or more bending units of the above-mentioned type arranged in series.
A specific problem that occurs in the field being considered is the need to provide rods which are bent at their opposite ends according to preset profiles. Bending both ends of the rods is in fact generally complicated and requires a relatively long time which causes limited productivity.
For this purpose, forming machines are known which have two bending heads that allow to separately bend the opposite ends of the rods. Said forming machines have a complicated structure and do not allow to form stirrups except with severe limitations.
It is also known to use machines meant to form stirrups, commonly known as stirrup benders, provided with auxiliary units which allow them to act as forming machines. These machines, however, have a very long operating time for producing rods bent at their ends and therefore cannot achieve high productivity.
SUMMARY OF THE INVENTION
The aim of the present invention is to solve the cited problem, by providing a method which allows to simply and quickly perform the automatic bending of the opposite ends of profiled elements and the like along any preset profile.
Within the scope of this aim, an object of the present invention is to provide a machine which performs said automatic bending of profiled elements and the like, has a simple and functional structure, is safely reliable in operation, highly flexible in use and capable of ensuring high productivity.
This aim and this object are both achieved, according to the invention, by the present machine for automatically bending profiled elements and the like, characterized in that it comprises a line for feeding the profiled elements to be bent; bending means which are suitable to bend at least a rear end of said profiled elements in a bending station which is arranged in a upper or lower position with respect to said feed line and lies substantially on a worktable which contains said line for feeding said profiled elements; means for transferring said profiled elements from said feed line to said bending station arranged in said lower or upper position.
REFERENCES:
patent: 4561279 (1985-12-01), Wears
patent: 4563802 (1986-01-01), Benteler
patent: 4766756 (1988-08-01), Shiue
patent: 5113683 (1992-05-01), Lafrasse
patent: 5182932 (1993-02-01), Ritter
patent: 5197320 (1993-03-01), Saegusa
patent: 5228322 (1993-07-01), Del Fabro
patent: 3644482 (1988-07-01), None
patent: 0 538 595 (1993-04-01), None
patent: 93 19865 (1993-10-01), None
Crane Daniel C.
Josif Albert
Modiano Guido
O'Byrne Daniel
Schnell S.p.A.
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