Supports – Stand – To hold a particular article
Patent
1990-10-17
1992-03-31
Talbott, David L.
Supports
Stand
To hold a particular article
248346, 269309, F16M 1100
Patent
active
051000881
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fixture for supporting objects so that the objects will be absolutely firm, i.e. will not shake or tremble, e.g. for supporting objects and hologram plates in the practice of holography.
BACKGROUND PRIOR ART
It is known to examine and measure the extent of the deformation of an object with the aid of holography. Double exposure of hologram plates enables changes in shape to be made visible on a hologram, in the form of images having a larger or smaller number of stripes in different configurations. This enables extremely small changes in shape, e.g. deformations as small as 0.3 micron, to be measured, which is highly significant when monitoring the quality of or load testing mechanical constructions. In view of the very small dimensions concerned in this regard, it is important that shaking between objects being examined and hologram plates used to take the two exposures be prevented to the maximum extent possible. Previously, certain difficulties have been experienced in fulfilling these conditions without the use of excessively complicated and expensive arrangements.
An object of the present invention is to provide means which will enable two objects, e.g. industrial products and hologram plates, to be mounted in a manner which will substantially prevent shaking from occurring and which will enable the same relative positions between the objects to be re-established subsequent to having moved one of said objects.
SUMMARY OF THE INVENTION
A fixture constructed in accordance with the invention includes two permanently and stably attached plates, each of which is provided with a plurality of holes for the attachment of support pegs of particular configuration. These pegs are intended for supporting objects. The one plate forms a relatively small angle with a vertical plane. It is mainly this plate that will support an object to be examined, e.g. an industrial object. The other plate forms a relatively large angle with a vertical plane. It is this plate which will support a second object, e.g. a hologram plate and optionally also the industrial object, depending upon the shape and dimensions thereof. The particular construction of the fixture ensures that the objects achieve positive and reproduceable abutment under the influence of gravity.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the accompanying schematic drawings, where
FIG. 1 illustrates from above a fixture constructed in accordance with the invention;
FIG. 2 is a straight-on front view of the fixture illustrated in FIG. 1;
FIG. 3 illustrates a holder for hologram plates with plates inserted;
FIG. 4 shows a support peg from one side;
FIG. 5 is a straight-on front view of the support peg shown in FIG. 4; and
FIG. 6 is a side view of an inventive fixture with inserted plate holders in greatly reduced scale.
DESCRIPTION OF A PREFERRED EMBODIMENT
The fixture illustrated in FIG. 1 includes two plates 11 and 12 which are fastened stably and permanently one to the other. The plate 12 has formed therein a plurality of holes, of which two are referenced 121, 122, which are intended for the attachment of screw-threaded support pegs and a holographic plate holder.
As will be seen from FIG. 2, the plate 11 is also provided with a plurality of holes, of which two are referenced 111, 112, which are intended for the attachment of screw-threaded support pegs. In the FIG. 2 illustration the plate 12 has three support points, namely a hemispherical projection 21 located symmetrically on the inner end of the plate, close to its attachment with the plate 11, and two symmetrically located legs 22 which can be displaced in holes in said plate. The two holes mentioned above are outwardly conical, so as to conform to the conical abutment surfaces of support pegs intended for screwing into the plates.
When the fixture 11-12 is placed on a flat, horizontal support surface, the plate 11 will form a relatively small angle .alpha. with a vertical plane, whi
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