Pressure pad of rubber or rubber-like materials for presses

DETAILED DESCRIPTION What I claim is: 1.
An elastic pressure pad of elastomeric material having in combination a marginal curved section with a radially inwardly directed annular connecting flange for sealing engagement with a rim portion of a rigid holding member for a press, said marginal curved section being provided with circular recess means having a relatively shallow depth so as not materially to weaken the wall thickness of said curved section, said recess means forming a fillet, said recess means being arranged within the region and in the direction of the medium radius of said curved section.
2.
A pressure pad in combination according to claim 1, in which said recess means has a circle segmentshaped cross section.
3.
A pressure pad in combination according to claim 1, in which the depth of said recess means amounts to from a fraction of to half of the radius of curvature of said marginal curved section.




Description:
The present invention relates to a pressure pad of rubber or rubber-like materials for presses which pad is provided with an edge sealingly inserted in rigid holding elements of the press and is angled off by means of an arc-shaped curved thickened cross sectional part.
For purposes of deep drawing open and primarily flat oriented formed articles or for purposes of deep drawing thin-walled pressed parts of sheet metal, frequently presses are employed which are actuated by hydraulic or other pressure means and in which the normally provided movable ram is replaced by an elastically deformable pressure pad.
The pressure pad which is in most instances produced without reinforcing inserts of elastomeric materials and sometimes is provided with a relatively thin soft rubber cover or layer is lowered onto the mold containing only the raw part to be pressed in order by a subsequent application of pressure with a simultaneous deformation of the raw part to be expanded into the hollow space of the mold.
Since the diaphragm-like pressure pad tends to adapt itself to all irregularities of the hollow space or chamber in the mold, it is possible true to desired dimensions to produce formed articles in a substantially shock-free and practically noiseless operation