Supports – Props and braces – Vacuum hold-down
Patent
1980-08-01
1983-11-08
Foss, J. Franklin
Supports
Props and braces
Vacuum hold-down
248363, A45D 4214
Patent
active
044138024
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for holding an object on a smooth shelf surface.
Frequently the shelf surfaces of cupboards and tables in modern kitchens are provided with plastic plates of very smooth surfaces. These are easily cleaned, however they are inconveniently smooth when stirring dough, beating or mixing, because the bowls or pot slips on the smooth surface. Again, dishes and plates easily slip on such smooth surfaces.
Similar problems are encountered when fixing objects aboard ships. The tossing and rolling motion of a ship require additional fixation.
In industry too means are required by which objects for instance must be secured on a smooth vibrating surface against slippage. In this case magnetically adhering means are often used.
It is the object of the invention to create a device by which an object shall be securely held on such a surface and can easily be detached from it again. Use shall be made of the suction-cup effect, which is known per se.
The invention solves this problem using a device characterized by two membranes mutually spaced and parallel to each other, at least one circular supporting ring between these membranes, and at least one centering means located at the center of said support ring, the supporting ring and/or the centering means being operationally connected in threaded manner in such a way that a relative rotation of the membrane is effected and in that the two membranes move apart in the region of the periphery and or approach each other at the center region. The suction-cup effect of the two membranes can be obtained in three different ways. This is explained in relation to the drawing.
The functioning of the above-cited three types of embodiments is shown schematically in the drawing, and several illustrative embodiments are shown in detail.
FIGS. 1-3 are schematics of the principle of operation,
FIG. 4 is a device operating on the principle of FIG. 1, shown in cross-section,
FIG. 5 is the device of FIG. 4, the left half showing its lower part, the right half its upper part, as top views,
FIGS. 6-8 are variations in detail,
FIGS. 9-11 is a device operating on the principle of FIG. 2 and shown in cross-section, in side-view in the states of rest and operation,
FIG. 12 is a device operating on the principle of FIG. 3 and shown in cross-section,
FIG. 13 is a variation in detail relating to FIG. 9,
FIG. 14 is a variation relating to FIG. 4 with only one supporting ring,
FIG. 15 shows the use of a device for holding an object on a flat shelving surface per FIGS. 4 and 5,
FIGS. 16-20 shows a detailed illustrative embodiment of a double suction means.
The schematics of FIGS. 1-3 show the three possible operative ways. In the mode of FIG. 1, the upper and lower membranes Mo and Mu resp. approach each other in the center region due to the forces K effective there, while the supporting ring R keeps the membrane rim at the same spacing. The two membranes therefore are shaped as shown in dashed lines form suction cups which fix themselves by suction to a shelf surface and to an object placed at the top on the upper membrane Mo.
The mode schematically shown in FIG. 2 operates on the two membranes Mo and Mu being made distant from each other at their peripheries but kept in their initial position at their center Z. The forces K act on the rim of the membrane.
A third possibility is shown in FIG. 3 as the combination of the two above cited modes. In this case the two membranes are forced apart at the rim and pulled together in the central region.
In all variations, a screw effect implements pulling together or forcing apart.
FIGS. 4 and 5 shown an illustrative embodiment operating on the principle of FIG. 1. The rim consists of two parallel supporting rings 10, 10' which are connected to the peripheral part of the membrane 20, 20'. Stop lugs 11, 11' are mounted inside to the supporting rings 10, 10' whereby the the angle of rotation .alpha. of the two rings relative to each other is restricted. A centering means 30 is mounted at the center, which comprises two threaded parts
REFERENCES:
patent: 2658765 (1953-11-01), Ferda et al.
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