Work holders – Plural holders to hold workpieces relative to each other – Workpieces parallel to each other
Reexamination Certificate
1999-03-09
2001-07-03
Hail, III, Joseph J. (Department: 3723)
Work holders
Plural holders to hold workpieces relative to each other
Workpieces parallel to each other
C269S2540CS, C269S239000
Reexamination Certificate
active
06254074
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a clamping device which is particularly suitable for use in the building industry, in metal structural work and also in carpentry and other sectors where it is necessary to fix one or more objects. At the moment, in the building industry for example, when finishing work has to be done on wall parts such as pillars, cornices, wall corners etc., a builder usually uses two metal or wooden boards, laying them out parallel with the sides of the structure to be refinished or constrained.
BACKGROUND ART
It is known that, to clamp the aforementioned boards in the position required, the current method is to use wooden or metal supports nailed to the boards themselves or a U-shaped piece, also wooden, is made whose two arms are attached or nailed to the corresponding board.
The system just described has some drawbacks.
An initial drawback comes from the fact that the aforementioned supports are unwieldy and they do not always manage to provide a constant pressure on the whole board and at times they cause the board to move in a damaging way which could lead to work being carried out which is not up to standard. Furthermore, the supports have a substantial side bulk which often limits their use.
A further drawback arises from the fact that the U-shaped piece obstructs and affects the builder's work in the area between the two boards, making it necessary in certain cases to move the U-shaped piece with the subsequent possibility of changing the original layout.
A further system in use to maintain the position of the boards and keep them constrained, is the use of a piece of iron rod, generally the type used for reinforcing reinforced concrete. The piece of iron rod is attached to the board, bent into the U-shape and then constrained to the other.
The system just described also has its drawbacks. An initial drawback was found to be the insufficient stability and the little holding power of the piece of iron rod since it is not always possible to make a part accurately and then fix it firmly to the boards.
A second drawback appears to be that if, for some reason, it is necessary to detach the piece of rod from the board, it is almost always impossible to reuse it, therefore a new piece must be prepared every time. All this leads to time wasting, a useless consumption of the materials and consequent increases in the working costs.
A further system envisages the use of small metal clamps but even these have shown to have their drawbacks.
A drawback, which is extremely limiting, is due to the difficulty involved in positioning the small clamps on the board since these can slip. To prevent them slipping, it should be a simple matter of clamping them but this destroys the homogeneity of the hold and results in different pressure at the various points of the board, with the risk of triggering off clamping and stability problems.
A further drawback comes from the fact that the small clamps are subject to considerable wear and tear caused by the presence of sand, dust and other substances.
DISCLOSURE OF INVENTION
The aim of the present invention is to solve the problems of the commonly known technique and overcome the drawbacks described above by means of a clamping device which can be adapted to fit any distance between the boards or objects to be held easily and then to clamp them.
A further aim of the present invention is to make available a device which can be used an unlimited amount of times and is much less bulky both when in use and not.
A still further aim of the present invention is to make available a lightweight, practical device which is flexible enough to be used in the building industry, in metal structural work, carpentry or any other sector.
A further aim of the present invention is to make available a device which is easy to manufacture and works well.
These aims and others, which will better emerge during the present description, are achieved in general by a clamping device according to the claims that follow.
REFERENCES:
patent: 1117662 (1914-11-01), Graham
patent: 1220899 (1917-03-01), Sorensen
patent: 4072303 (1978-02-01), Szabo
patent: 5041028 (1991-08-01), Stahle
patent: 5050921 (1991-09-01), Hultquist
patent: 5373596 (1994-12-01), Harrell
patent: 5791210 (1998-08-01), Wolff
patent: 21 12601 (1970-11-01), None
patent: 1068255A (1984-01-01), None
Hail III Joseph J.
Shanley Daniel
Vigil Thomas R.
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