DE1046443B - Ring-shaped seal made of elastically deformable material for suction plates - Google Patents

Description

The invention relates to an annular seal made of elastically deformable material for suction clamping plates, which is inserted into a deep groove in the plate that runs perpendicular to the workpiece support surface and which protrudes over the support surface in the relaxed state.

In the known suction clamping plates, an inserted into a relatively shallow groove, circular sealing ring made of foam rubber or the like. Used. Since this sealing ring when Clamping the workpiece is fully pressed into the groove, so is, especially with smaller Suction clamping plates, the rubber counterforce is relatively large or the suction force is not thereby insignificantly decreased. In addition, the resistance to displacement of the workpiece is also reduced. This known design of the rubber seal is also effective for thin metal sheets with low bending resistance unfavorable, as these sheets are unable to fully up the rubber seal to push down to the surface of the clamping plate. Finally, the usual rubber gasket is not either sufficient to securely clamp somewhat uneven workpieces.

There is also an annular seal of the type mentioned in which a rubber ring in a vertically arranged deep annular groove of the suction clamping plate is used. This sealing ring fills with its rectangular cross-section, the ring groove completely. As is well known, rubber is not compressible is, only the part of the rubber seal protruding beyond the annular groove can deform, whereby so the rubber seal should only move a little downwards when the workpiece is under load can, so here the workpiece does not come to a firm support on the suction plate.

This previously known seal, which is inserted into a deep, vertical annular groove, cannot be used even if the foam rubber customary for suction clamping plates is used instead of solid rubber. Y> e \ ^ eY & sVKug, e \ u evasion is also not possible with the part of such an annular foam rubber seal protruding over the suction clamping plate;

In order to eliminate the above-mentioned deficiencies, according to the invention, constrictions are provided transversely to the pressure direction in the annular seal inserted into a vertically extending deep groove of the suction clamping plates. These constrictions create cavities between the seal and the groove wall, which allow the sealing material to evade when the seal is stressed. Through this

Ring-shaped © seal

made of elastically deformable material

for suction clamping plates

Applicant:

Albert Fezer, Zeil near Eßlingen / Neckar, Alte Heusteige 16

Albert Fezer, Zeil near Eßlingen / Neckar, has been named as the inventor

special shape of a seal arranged in a relatively deep, vertical annular groove can this work in the full height of its cross-section, d. That is, there is a spring characteristic according to which the spring force of the rubber seal increases only slightly when the workpiece is pressed down. The result is a smaller rubber counterforce, which has the advantage that it holds the workpiece firmly The suction force is increased and the displacement resistance of the workpiece is also increased.

Furthermore, this relatively low sealing counterforce has the advantage that even with thin Sheets with low bending resistance, the rubber seal right up to the surface of the clamping plate is pressed down, so the stretched thin sheets are completely even with their edge part lie.

In the drawing, exemplary embodiments according to the invention are shown. Show it

1 and 2 show a partial cross-section through a suction clamping plate with an annular groove and seal of known design in the unloaded state and after clamping,

3 and 4 the same representation of a suction plate according to the invention,

5 and 6 show the same representation of another embodiment of the invention.

It denotes 1 a suction clamping plate and 2 an annular groove provided in this plate in which an annular groove Seal 3 made of foam rubber or the like. Is inserted. When clamping a workpiece 4, for. B. one Sheet metal, this seal is very strongly deformed or compressed according to FIG. 2, so that a considerable

809 698/165

Claims (2)

Licher resistance of the rubber seal occurs / which affects the counterforce P. . .. According to the invention, in the embodiment according to Fig. 3, 4 or 5, 6. Ring grooves 5 and 6 are provided in the suction clamping plate, the depth of which * is considerably greater; is than its width b. According to FIGS. 3 and 4, two sealing rings 3, one above the other, with the usual circular cross-section are arranged in the annular groove 5, so that the entire seal consists of two parts and has constrictions 7 transversely to the pressure direction. As a result of these constrictions, the deformation resistance of the ring seal is considerably lower than according to FIG. 1, so that even a thin-walled workpiece_4, -Z, .B. thin sheet metal, this seal completely pressed to the surface of the clamping plate without bending. In the embodiment according to FIGS. 5 and 6, an annular seal 8 is provided which also has constrictions 7 in the sense of the invention. Here, too, as illustrated in FIG. 6, the deformation resistance is considerably lower than in the case of a normal clamping plate seal. -r Patent claims: 1. Annular seal made of elastically deformable material for suction clamping plates, which are in a perpendicular to the workpiece support surface is used deep groove of the plate and the relaxed State protrudes over the support surface, characterized in that the seal constrictions having transverse to the printing direction. 2. Seal according to claim 1, characterized in that the seal consists of two or more known adjacent parts having a circular cross-section. Considered publications:
U.S. Patent No. 2,443,987. 1 sheet of drawings © 809 698/165 12.58