Supports – Brackets – Adjustable
Patent
1999-07-15
2000-12-26
Braun, Leslie A.
Supports
Brackets
Adjustable
2482781, 2482761, 2482741, E04G 300
Patent
active
061646121
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an adjustable stand or support for supporting a load, particularly a lamp or the like, in a manually predetermined vertical position, and, more particularly, to an adjustable stand or support for supporting a load, particularly, in a manually predetermined vertical position, comprising a tubular arm pivotally connected with a connecting piece or a vertical stand tube of the stand or support and means for weight compensation for the load including a compression spring with a predetermined pre-tensioning received on a spindle extending in the tubular arm.
Because of the construction design in known stands, the assembly of the compression spring for balancing of masses with respect to a supported load is very costly and therefore correspondingly cost-intensive.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a stand of the aforementioned type which does not have the disadvantages mentioned above.
According to the invention the adjustable stand for supporting a load, especially a lamp, in a manually predetermined vertical position, includes a tubular arm to which the load is connected; an arm joint by which the tubular arm is pivotally connected to another part of the stand; a spindle arranged in the tubular arm and a compression spring received in a frictional engagement by the spindle with a given pre-tensioning by means of a first spring stop in the form of a washer through which the spindle extends and by a second spring stop. The spindle has an axial extension in the vicinity of the first spring stop pivotally connected with the another part by means of a lever pivotally connected by a first pivot joint to the axial extension and by a second pivot joint in the another part. The tubular arm is provided with two opposing indentations located in the vicinity of the first spring stop and having a distance from one another such that the washer forming the first spring stop has two opposing first sides closer to each other than the indentations are from each other and two opposing second sides arranged rotated 90.degree. to the first sides and further from each other than the indentations are from each other, so that the washer may pass by the indentations during assembly and rotate 90.degree. to take a bayonet locking position. The spindle, the first and second spring stops, the compression spring, the axial extension and the lever with a first and second pivot joint are constructed together as a structural unit. The first sides are formed so that, when the washer is in the bayonet locking position and is rotated axially, the first sides are jammed against the indentations, so that the second sides cannot be rotated out of the bayonet locking position unintentionally, but only deliberately by axially pressing in and rotating the structural unit so as to relieve the structural unit.
In a preferred embodiment the tubular arm has a circular cross-section, but the cross-section of the tubular arm can also be rectangular.
BRIEF DESCRIPTION OF THE DRAWING
The objects, features and advantages of the invention will now be illustrated in more detail with the aid of the following description of the preferred embodiments, with reference to the accompanying figures in which:
FIG. 1 is a cross-sectional view through the structural unit formed of a compression spring and spindle;
FIG. 2 is a cross-sectional view through the structural unit according to FIG. 1, but rotated axially by 90 degrees;
FIGS. 3-7 are respective different cross-sectional views of an arm tube with indentations showing the interaction between the latter and a first spring stop;
FIG. 8 is a cross-sectional view of the arm tube in section B--B according to FIG. 9;
FIG. 9 shows the arm tube rotated by 90 degrees in a section A--A according to FIG. 8, FIG. 10 is a side cross-sectional view of the tubular arm with a stand tube which is connected by a pivot joint;
FIG. 11 shows an enlarged sectional view of section C--C from FIG. 8;
FIG. 12 is a side view of, its entire
REFERENCES:
patent: 3584793 (1971-06-01), Ilzig
patent: 4080530 (1978-03-01), Krogsrud
patent: 4082244 (1978-04-01), Groff
patent: 4107769 (1978-08-01), Saluja
patent: 4160536 (1979-07-01), Krogsrud
patent: 4166602 (1979-09-01), Nilsen et al.
patent: 4770384 (1988-09-01), Kuwazima et al.
patent: 5004368 (1991-04-01), Warga
Braun Leslie A.
Striker Michael J.
Wella Aktiengesellschaft
Wujciak A. Joseph
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