Geometrical instruments – Straightedge type – Plural straightedges nonadjustably fixed at right angles
Patent
1996-07-29
1998-06-30
Fulton, Christopher W.
Geometrical instruments
Straightedge type
Plural straightedges nonadjustably fixed at right angles
33403, 33465, 33478, B43L 7027, B43L 710
Patent
active
057715971
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for connecting the arms of an angle, such as a construction angle.
DESCRIPTION OF THE PRIOR ART
Handymen and workers in the construction industry, and in other fields, often need to measure or set angles over longer distances or components, such as when building or setting walls or partition walls at a certain angle, usually a right angle, to each other, or when drawing lines at right angles to each other. Conventional construction angles have the disadvantage that their arms are relatively short. If longer lines have to be drawn, normally battens are placed on the arms to lengthen them. As a result, however, errors of alignment are practically unavoidable. Longer arms make the construction angle exceptionally unwieldy, especially for transport and storage.
In order to avoid this disadvantage, it is known (DE-GM 92 03 881) to connect the two arms of the angle detachably to an intermediate piece (corner piece), whereby clamping devices in the form of conventional detachable furniture connectors are provided between the end faces of the arms and the intermediate piece. Through this construction it is possible to use long arms, as the angle can be disassembled for transport and storage and reassembled at the place of use. However, disadvantages have been (1) the low stability of the assembled angle and the measuring errors caused thereby, especially with longer arms, and (2) the fact that at the end faces of the arms and the corresponding faces of the intermediate piece, cooperating clamping devices must be provided requiring the use of expensive prefabricated arms. Further, the furniture connectors used as clamping devices are exposed to considerable wear as a result of frequent slackening and tightening, whereby dimensional stability is impaired.
SUMMARY OF INVENTION
It is the task of the invention to provide a device of the species set forth where, by use of simple battens of wood, light metal or another material, an exceptionally stable angle can be manufactured. In this way long distances, components or lines can be arranged against each other or drawn towards each other reliably at a predetermined angle, preferably a right angle.
In the device according to the invention the arms are set in rails of the corner piece over a long distance, so that the assembled angle is exceptionally stable. Since simple battens can be used as angle arms, an angle with any desired arm length can be assembled in an exceptionally inexpensive way.
The detachable connection of each arm to the rails is preferably provided by two spaced retaining means on each rail to ensure that the arms butt against the rails, and therewith form the desired angle, preferably a right angle, with each other.
The retaining means are preferably clamping bands, for example in the form of conventional pipe clamps, which enclose the arms so that the arms can easily be connected to and released from the rails.
The rails can consist of flat material. However, they preferably have an L- or U-shaped cross-section which opens outwardly, forming a lateral guide for receiving the arms. Additionally, it is especially advantageous if the rails are open at both ends, so that one of the battens which forms an arm of the angle can be fixed, projecting over the corner piece to form a T-shaped structure whereby (1) a right angle to the base formed by this batten can be more precisely determined and (2) an outer angle can be checked.
In order to stabilize the rails in their position in relation to each other, the rails can be braced, e.g. (1) by a strut which runs diagonally to the rails, forming the hypotenuse in the case of a right angle, and is connected to the rails, or (2) by a plate which connects the rails. The strut or plate can be provided with a graduation in degrees to define any angle between the arms by means of a cord fixed in the corner of the corner piece.
Preferably the corner piece, together with the rails and the strutting, is formed from a single-part component. This component can b
REFERENCES:
patent: 1770304 (1930-07-01), Ferris
patent: 4882846 (1989-11-01), Reed
patent: 5351407 (1994-10-01), Van Drielen
patent: 5524353 (1996-06-01), Fink
Fulton Christopher W.
Klaus Bau-Technik
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