Stock material or miscellaneous articles – Hollow or container type article
Reexamination Certificate
2000-07-21
2004-03-02
Pyon, Harold (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
C428S607000, C428S608000, C428S036700, C245S001000, C245S002000, C245S003000, C245S004000, C245S005000, C245S006000, C245S007000, C245S008000, C245S009000, C245S010000, C277S650000, C277S653000, C502S527200
Reexamination Certificate
active
06699540
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to materials of packing and the packing made from the materials, and more particularly, it relates to the materials used in a packing which can maintain a good sealing ability for a long time, even when it is used under a high temperature.
2. Description of the Related Art
The exhaust system of a car comprises an exhaust pipe, a catalytic converter, a silencer and such. Further, since the condition of regulation of exhaust gas is getting severe in these days, catalytic converters are starting to be equipped with exhaust systems of motorcycle with four cycle engines.
Within such exhaust systems of automobiles, there is packing (a gasket) installed at a connecting portion of an exhaust pipe and a catalytic converter, i.e., in between a flange set on an end portion of the exhaust pipe and a flange set on an end portion of the catalytic converter, for preventing exhaust to leak out. As for such packing, for example, there is packing which is constructed by cylindrically pressure forming powder or sheet body of expansive graphite.
With the above mentioned existing packing, however, was not preferable for setting on the connecting portion of an exhaust pipe and a catalytic converter. Normally, exhaust of about 400 to 850° C. circulates at the connecting portion of an exhaust pipe and a catalytic converter. The expansive graphite when used under a relatively low temperature is outstanding conformability to the attaching material, self lubricating ability and chemical resistace. However, the expansive graphite also has a defect that it can easily be oxygenated and sublimated in an atmosphere of high temperature of about 400 to 850° C. Therefore, packing made only from expansive graphite was problematic that it lowered its sealing ability if it was used in a condition wherein it was exposed to a fluid of high temperature, because applied relaxation occurred within relatively a short period of time.
Further, due to exhaust system which was continuously vibrating by pulse of exhaust and such, packing made only from expansive graphite had a problem that its sealing ability got lowered within relatively a short period of time. Since a portion around the surface of packing made from expansive graphite had a structure wherein graphite was laminated in a direction of the thickness of packing, the surface layer of packing was easily peeled off when vibration was transmitted to packing. When peeling of the surface layer started, space was formed between a flange set on the end portion of a exhaust pipe and packing or between a flange set on the end portion of a catalytic converter and packing, and exhaust of high temperature came into the space, thus, peeling was quickly promoted even more. In such case, the fluid of high temperature leaked out through the space formed between the flange and packing, therefore, sealing ability could not be maintained.
Moreover, the function of packing used in an exhaust system is to reduce the vibration in each portions of exhaust system which vibrates by the pulse of exhaust. With the above mentioned packing, the vibration could be reduced by the elasticity thereof at the beginning stage of usage. However, as mentioned previously, the packing might be oxygenated or sublimated, or due to peeling occurred on the surface of the packing and space created between the packing and attaching material thereto, the elasticity of the packing could not work efficiently and thus, the vibration in exhaust system could not be lowered. In this case, big vibrating noise is arose from the portions of exhaust system, transmitting the vibration to the driver's seat and causing an unpleasant drive.
As for portions which are exposed to fluid of high temperature of over 400° C., other than the above mentioned exhaust system of automobiles, there are, for example, shaft seal portion of fluid machine of each type which works with fluid of high temperature. At this shaft seal portion, the above mentioned packing made only from expansive graphite was mainly used hitherto. Thus, there was a problem that it was necessary to replace the packing frequently due to lowering of sealing ability of the packing within a short period of time.
BRIEF SUMMARY OF THE INVENTION
The present invention has invented under such actual circumstances, and aims to offer the materials used in a packing which can maintain a good sealing ability for a long time, even when it is used under a high temperature. Additionally, more concretely speaking, the packing mentioned here, for example, indicates seal rings, ring joints, seal washers, spacer rings, seal for absorbing vibration and such which are used under a high temperature.
The present invention as set forth in claim
1
is a packing material wherein one or a plurality of hard metal wire and one or a plurality of soft metal wire are tied up or twisted in a bundle to construct a weft material wherein the ratio of the number of the former to the number of the later is 1:1-0.3, the weft material is put in weft knit processing such as plain stitch, rib stitch, pearl stitch, welt stitch, half cardigan, full cardigan, plating stitch and inter-lock stitch, and Brinell hardness of said hard metal wire is 90-240 (Kg/mm
2
) and Brinell hardness of said soft metal is 40-55 (Kg/mm
2
), wherein said hard metal wire is constructed from stainless carbide cast iron comprising iron (Fe) as a main component and each of the following as necessary components by weight %; C: 0.6-4.0%, V: 4-15%, Cr: 13-30%, Ni: 4-15%, Si: 0.2-4.5%, Mn: 0.2-1.5%, P: 0.01-0.15%, S: 0.01-0.05% and within such organization, mainly covalent bonded spheroidal or granular carbide of V-C system is crystallized, and the soft metal wire is constructed from either one of copper, copper alloy, aluminum or aluminum alloy.
The present invention as set forth in claim
2
is a packing material wherein one or a plurality of hard metal wire and one or a plurality of soft metal wire are tied up or twisted in a bundle to construct a warp material wherein the ratio of the number of the former to the number of the later is 1:1-0.3, warp material is put in warp knit processing such as single tricot stitch, single atlas stitch, plain code stitch, double tricot stitch, lace stitch, Milanese stitch and raschel stitch, Brinell hardness of said hard metal wire is 90-240 (Kg/mm
2
), and Brinell hardness of said soft metal is 40-55 (Kg/mm
2
), wherein said hard metal wire is constructed from stainless carbide cast iron comprising iron (Fe) as a main component and each of the following as necessary components by weight %; C: 0.6-4.0%, V: 4-15%, Cr: 13-30%, Ni: 4-15%, Si: 0.2-4.5%, Mn: 0.2-1.5%, P: 0.01-0.15%, S: 0.01-0.05% and within such organization, mainly covalent bonded spheroidal or granular carbide of V-C system is crystallized, and the soft metal wire is constructed from either one of copper, copper alloy, aluminum or aluminum alloy.
The present invention as set forth in claim
3
is a packing material wherein one or a plurality of hard metal wire and one or a plurality of soft metal wire are tied up or twisted in a bundle to construct a weft material and a warp material wherein the ratio of the number of the former to the number of the later is 1:1-0.3, a plurality of each of the warp material and the warp material are prepared and put in knit processing such as single weave combination weave, gauze & leno weave, figured weave, and Brinell hardness of said hard metal wire is 90-240 (Kg/mm
2
) and Brinell hardness of said soft metal is 40-55 (Kg/mm
2
), wherein said hard metal wire is constructed from stainless carbide cast iron comprising iron (Fe) as a main component and each of the following as necessary components by weight %; C: 0.6-4.0%, V: 4-15%, Cr: 13-30%, Ni: 4-15%, Si: 0.2-4.5%, Mn: 0.2-1.5%, P: 0.01-0.15%, S: 0.01-0.05% and within such organization, mainly covalent bonded spheroidal or granular carbide of V-C system is crystallized, and the soft metal wire is constructed from either one of copper, copper alloy, aluminum
Cislo & Thomas LLP
Japan Matex Kabushiki Kaisha
Pyon Harold
Simone Catherine A.
LandOfFree
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