Abstract A sealing gasket is disclosed comprising essentially a layer of elastic sealing material and a layer of reinforcing material, e.g., a metal sheet, this sheet being perforated with a great number of small holes located in relation to each other with a varying density in such a manner that said density is lowest in the areas where, in use of the gasket an increase in the specific pressure is desirable or necessary, the edge of gasket apertures registering with apertures corresponding for instance to cylinder being folded back, if desired, in order to provide locally an extra thickness producing an increased specific pressure, the perforations being advantageously produced by means of a tool comprising punches optionally rendered active or inactive by means of a patterned platen provided serving to operate the punches in the manner of a Jacquard loom, the entire perforation being carried out in one or several operations.
A gasket comprising at least two bonded layers of resilient sealing material, and substantially noncompressible reinforcing material, respectively, at least one layer of noncompressible reinforcing material having stock blanked out therefrom to produce a multitude of tiny holes into which holes the overlying resilient sealing material is partially forcible by the clamping pressure to which the gasket is subjected, the density of said holes per unit of area of the overlying sealing material being nonuniform in the sense that the density is relatively low in one area where a relatively high specific sealing pressure is to be produced, and higher in another area where a relatively low specific sealing pressure is to be produced.
Claim 2
Dependent Claim
114 words
A gasket comprising at least two bonded layers of resilient sealing material, and substantially noncompressible reinforcing material, respectively, at least one layer of noncompressible reinforcing material having stock blanked out therefrom to produce a multitude of tiny holes into which holes the overlying resilient sealing material is partially forcible by the clamping pressure to which the gasket is subjected, the density of said holes per unit of area of the overlying sealing material being nonuniform in the sense that the density is relatively low in one area where a relatively high specific sealing pressure is to be produced, and higher in another area where a relatively low specific sealing pressure is to be produced.
Claim 3
Dependent Claim
43 words
A gasket as defined in claim 1 in which the gasket comprises a passage therethrough and in which said passage is bordered by a continuous relatively narrow zone within which the hole density is substantially lower than in the area beyond said zone.
Claim 4
Dependent Claim
32 words
A gasket as defined in claim 1, in which the gasket comprises a passage therethrough and in which said passage is bordered by a continuous relatively narrow zone free from said holes.
Claim 5
Dependent Claim
52 words
A gasket as claimed in claim 1, in which the variation of the pattern density is selected so as to compensate for flexure of the machine parts between which the gasket lies compressed in operation so as to create a desired sealing pressure distribution over the confronting surfaces of said machine parts.