Supports – Stand and bracket – Having adjustable bracket
Patent
1994-07-08
1997-09-09
Braun, Leslie A.
Supports
Stand and bracket
Having adjustable bracket
2481232, E16H 1100
Patent
active
056647476
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an adjustable support device with a body for positioning, for example a light fitting, comprising an adjustable arm supported in a tilting point, to which arm the body for positioning and a counterweight are connected on either side of the tilting point.
1. Description of Background Art
Such a support construction is known from the German Gebrauchsmuster G 88 16 029. In the known support device a rigid arm is disposed from tilting around a shaft, which shaft is horizontally clamped between two vertically standing parts. On one side of the arm relative to the tilting point is fixed a lamp holder, on the other side a counterweight is suspended using a cable, at a location such that both parts tilting point at any possible adjusted position of the arm.
With a change of the adjusted position of the arm, that is, with a change of the angle between the arm and the vertically standing parts, the horizontal distance of the counterweight to the vertically standing parts also changes. Because changing this latter distance is only possible to a limited degree, the range within which the arm can be adjusted is also limited.
2. Summary of the Invention
The object of the invention is to provide an adjustable support device not possessing this limitation.
The objective is also to provide a support arm which can be embodied in light, in particular flexible, materials.
This object is achieved according to the invention with a support device the counterweight of which comprises at least one holder in which at least one mass is received for free movement such that the center of gravity of the support device and the tilting point lie on a vertical line in any position of the arm.
With such a support construction, it is possible to vary the angle between the adjusting arm and the normal from 0.degree. to 180.degree..
In an embodiment the arm is rigid and in a vertical longitudinal section, the holder comprises at least partially a circular arc.
In an equilibrium situation in such a support device, the mass lies in the holder in the lowest point thereof. When the position of the arm is now changed, the mass moves in the holder along the arc until the lowest point is again reached and the arm is again balanced.
Depending on the material used for the arm and the ratio between length and section of the arm, the arm can be considered as either rigid or flexible. It is not possible to embody a flexible arm in the known manner such that the arm is in balance at each angle of the arm to the normal. The cause of this is the bending of the arm under the influence of gravity on the mass of the body for positioning and on the individual mass of the arm. As a result of this deflection, the distance of the body for positioning to the tilting point changes in the absolute sense, as a result of which in a balanced system the point of suspension of a counterweight would also have to be changed.
In a following embodiment of a support device in accordance with the invention, the arm consists at least partially of flexible material and in longitudinal section the holder has at least partially an egg shape, wherein the head of the egg is outwardly oriented.
It has been found that in such a support device, the moments of the forces which are applied to the body for positioning and the counterweight relative to the tilting point are always equal to each other. By changing the angle between the arm and the normal, the bending of the flexible arm changes, and therefore also the absolute value of the distance of the body for positioning to the tilting point changes. The change in the moment of the gravity applied to the body relative to the tilting point which accompanies this change cannot then be compensated by the movement of a freely displaceable mass along a circular path. This change of the moment of the force can however be compensated when the mass in the holder of the counterweight is freely movable along a path which is ovoid in longitudinal section, wherein the blunt side of the egg is directe
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Bekker Paul Andre
Braun Leslie A.
Wood Kimberly T.
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