Static structures (e.g. – buildings) – Lazy tong extension unit
Patent
1985-06-28
1987-02-03
Perham, Alfred C.
Static structures (e.g., buildings)
Lazy tong extension unit
52645, 52695, 2482801, 2482811, E04H 1218, A47F 508
Patent
active
046400621
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL AREA OF THE INVENTION
The invention relates to a lattice bracket of variable cantilevered length, which bracket has an articulated lattice structure which is pivotally fastened at two fixed points on a wall or on any other support.
DESCRIPTION OF THE STATE OF THE ART
Brackets, especially wall brackets of various forms and for various purposes are already known in a great number of configurations. The simplest wall brackets are, for example, in the form of designs which can be extended in a bellows-like manner, consisting of two legs or flaps crossing one another at joints. These wall brackets are usually pivotable laterally on a bolt disposed on a plate that can be fastened to the wall. Therefore, such wall brackets can also be shifted in planes parallel to the wall. A bracket of variable cantilevered length constructed in the manner of a so-called lazy tongs is described in detail in DE-AS 2 119 849. It is constructed essentially by doubling a two-legged shear in a bellows-like extensible or contractable manner such that the double shear is supported in the middle part by a beam, the two ends being connected each to a transverse frame. Thus the double shear forms a frame which can be collapsed on both sides. The collapsibility is assured by the articulation of the double shear.
Another wall bracket configuration is disclosed in DE-AS 2 207 521. This wall bracket is intended especially for hanging articles of clothing (such as trousers, jackets etc.) in shops. The wall bracket is of rigid construction and it is supported in a shaped plate fastened to the wall by screws at two points, but so as to be pivotable laterally.
Another wall bracket design is provided for the holding and display of articles of clothing, which is described in detail in German Pat. No. 1,813,359. To a pentagonal plate affixed by screws to the wall there is fastened an upright support of wood or metal on which clothing hangers can ride.
Lastly, another wall bracket design is disclosed in DE-PS 2 019 457, which is also intended for the holding and display especially of garments in shops. In this case a plurality of radially cantilevered telescoping or nontelescoping supports are fastened by two bolts or pins disposed at different levels in a sleeve which can be rotated about a column or standard.
In addition to those described above, wall brackets are also known in a great number of other configurations, but in most cases they are rigid supports held at one end. While these supports are generally of constant, invariable length, the shear type constructions which can be extended and retracted in the manner of bellows have the disadvantage that only a vertically downwardly directed force acts on the free end at the point of engagement of the load, so that the loaded end of the bracket usually sags, and the bracket itself undergoes a permanent change of shape or deformation.
SUMMARY OF THE INVENTION
The object of the present invention is to create a bracket of variable length which will be free of the above-mentioned disadvantages of the known wall bracket designs, especially the extensible and contractable types, and whose cantilevered length can be varied in a simple manner but will remain steady after being varied, and in which the loading force will bring about a favorable distribution and transmission of the reaction forces occurring under load in the bracket links to the preferably articulated mounting points.
The stated object is attained by the creation and use of a lattice-like bracket of the kind specified in the beginning, in which, in the meaning of the invention, starting out from two fixed, spaced-apart pivot points, at least two parallelogram-like articulated lattice fields, each consisting of articulated links and of spacers of a length always equal to the spacing between the fixed pivot points and joining the ends of the links together in pairs, are in tandem arrangement, and at least one of the fixed pivot points is connected to the diagonally opposite articulation point of the outermost spacer of the ou
REFERENCES:
patent: 2161337 (1939-06-01), Cordova
patent: 3593481 (1971-07-01), Mikulin
patent: 3774873 (1973-11-01), Krogsrud
patent: 4160536 (1979-07-01), Krogsrud
patent: 4208028 (1980-06-01), Brown et al.
patent: 4266747 (1981-05-01), Souder, Jr. et al.
Kozponti Valto-es Hitelbank Rt.
Perham Alfred C.
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