Circular double-jacketed gasket with single joint

The method of forming a circular double-jacketed gasket, comprising:

• forming a linear double-jacketed gasket assembly having a substantially rectangular cross-section including a metal shell and metal liner encasing a strip of resilient core material;
• compressing the gasket assembly with a substantially even compression with the greater cross-sectional dimension thereof extending between and along a line parallel to the axes of a pair of compression rolls;
• bending the gasket assembly edgewise in the plane parallel to the bases having the greater dimension a predetermined amount at the nip between the compression rolls to form a circular gasket assembly having a predetermined radius of curvature free of undesired buckling or wrinkling in the metal shell and liner;
• severing a circular gasket unit from the gasket assembly;
• and
• securing together the severed ends of the circular gasket unit to form a circular double-jacketed gasket having a single joint connection about its entire circumference.

The method of forming a circular double-jacketed gasket from a substantially linear double-jacketed gasket assembly having a substantially rectangular cross-section including a first metal strip forming a shell having a base portion and side portions with the width dimension of the base portion being greater than the dimension of the side portions, a filler strip of resilient core material confined between said side portions and a second metal strip forming a liner having a base portion overlying the core and substantially the same width dimension as the base portion of the shell with the outer edges of the liner confined by the side portions of the shell comprising:

• compressing the base portions of gasket assembly with a substantially even compression between compression rolls;
• curving the gasket assembly edgewise in a plane parallel to said base portions a first predetermined amount at the nip between the compression rolls to form a circular gasket assembly having a first predetermined radius of curvature of the finished gasket unit and the metal shell and liner being free of undesired buckling or wrinkling;
• reducing the radius of curvature of the gasket assembly to the radius of curvature of the desired circular gasket unit to relieve stresses in the assembly and provide uniform curvature of the gasket assembly;
• severing a circular gasket unit from the gasket assembly forming a gasket unit having a circumference slightly larger than the desired circumference of the finished gasket;
• and
• welding the severed ends of the shell and the severed ends of the liner in slightly overlapping relationship an amount sufficient to provide the desired circumference of the finished gasket having a single weld joint above its entire circumference.

An apparatus for forming a double-jacketed gasket from a plurality of metal shell strips and a strip of resilient core material comprising:

• means for forming a linear gasket assembly having a substantially rectangular cross-section, formed by a metal shell and a metal liner formed from the metal strips with the core material encased by the metal shell and liner;
• means for curving the gasket assembly edgewise in the plane of its greater dimension a predetermined amount to form a uniform circular gasket assembly free of undesired buckling or wrinkling;
• and
• the curving means including a plurality of compression rollers that compress the sides of the gasket assembly having the greater dimension with the axes of the rollers maintained substantially parallel to the gasket sides;
• and
• the curving means including a plurality of curving rolls encasing the shell and positioned and arranged to curve the linear gasket assembly in the nip of the compression rollers.

An apparatus for forming a circular double-jacketed gasket assembly comprising:

• means for forming a double-jacketed linear gasket assembly having a substantially outer rectangular metal casing surrounding an inner core of resilient fibrous material;
• means for curving the linear gasket assembly edgewise a predetermined amount in the plane of its greater dimension to form a circular gasket assembly having a uniform cross-section free of undesired buckling or wrinkling in the metal shell;
• the curving means including a plurality of compression rolls that compress the sides of the gasket assembly having the greater dimension with a substantially even compression;
• and
• means for curving the gasket assembly edgewise a predetermined amount in the nip of the compression rolls to form a circular gasket assembly having a uniform cross-section free of undesired buckling or wrinkling in the metal shell.

An apparatus for forming a double-jacketed gasket from a plurality of metal shell strips and a strip of resilient core material comprising:

• a plurality of powered rolls for forming a linear, substantially rectangular gasket assembly having a metal shell with a base portion and side portion, a metal liner with a base portion retained by inwardly bend ends of the shell side portions with the core material enclosed by the metal shell and liner;
• means for curving the gasket assembly edgewise in the plane of its greater dimension a predetermined amount to form a uniform circular gasket assembly free of undesired buckling or wrinkling including a plurality of compression rolls that compress the base portions of the gasket assembly having the greater dimension with a substantially even compression and a plurality of curving rolls positioned and arranged to curve the linear gasket assembly in the nip of the compression rollers;
• and
• a first plurality of the rolls engaging the side portions of the gasket assembly for curving the linear gasket assembly edgewise at the nip of the compression rolls in the plane of its greater dimension a first predetermined amount and a second plurality of the rolls engaging the side portions of the gasket assembly for bending the curved gasket assembly edgewise in the plane of its greater dimension to reduce said first predetermined amount of curvature by a second predetermined amount to relieve stresses in the circular gasket assembly and provide a uniform curvature to the circular gasket assembly.

A single weld joint, circular double-jacketed gasket comprising:

• a first circular metal shell means having a base portion, upstanding sides with inwardly bent retaining end portions;
• a circular core of resilient fibrous material disposed on the base portion and between the side portions of the first metal shell means;
• a circular flat second metal liner means disposed on the core and retained thereupon by the inwardly bent retaining end portions forming an outer metal jacket of substantially rectangular cross-section;
• and
• a single weld joint about the entire circumference of the metal shell means and metal liner means forming a completed circular gasket.

A method of forming a double-jacketed circular metal gasket, comprising the steps of:

• superimposing a first linear metal strip on a second linear metal strip, with a non-metallic flexible linear resilient core strip therebetween, wherein the second strip is wider than the first strip and forms the shell;
• thereafter bending the linear edges of the second strip around the linear edges of the first strip, whereby a gasket assembly is provided with the first strip forming a liner enclosing the core material between the shell and the liner;
• passing the gasket assembly between a first pair of compression rolls and applying substantially even pressure on the gasket assembly at the nip between the rolls;
• and
• exerting a bending force on one linear edge of the gasket assembly at a point beyond the compression rolls while the pressure is applied at the nip between the rolls for forming the gasket assembly into a circular configuration having a predetermined radius and with said one linear edge becoming an outer edge thereof.

An apparatus for forming a double-jacketed circular metal gasket comprising:

• means for superimposing a first linear metal strip on a second linear metal strip with a non-metallic flexible linear resilient core strip therebetween, wherein the second strip is wider than the first strip and forms the shell;
• means for bending the linear edges of the second strip around the linear edges of the first strip, whereby a gasket assembly is provided with the first strip forming a liner enclosing the core material between the shell and the liner;
• a first pair of compression rolls for applying a substantially even pressure on the gasket assembly at the nip between the rolls;
• and
• means for exerting a bending force on one linear edge of the gasket assembly at a point beyond the compression rolls while the pressure is applied at the nip between the rolls for forming the gasket assembly into a circular configuration having a predetermined radius with said one liner edge becoming the outer edge thereof.

The method of forming a circular double-jacketed gasket assembly, comprising the steps of:

• forming a double-jacketed linear gasket assembly having a substantially outer rectangular metal casing surrounding an inner core of resilient fibrous material;
• curving the linear gasket assembly edgewise a predetermined amount in the plane of its greater dimension to form a circular gasket assembly having a uniform cross-section free of undesired buckling or wrinkling in the metal shell;
• the step of curving including compressing the gasket assembly in the plane of its greater dimension between compression rolls whose axis of rotation are maintained substantially parallel to said plane;
• and
• curving the gasket assembly edgewise in said plane a predetermined amount at the nip between the compression rolls to form a uniform, circular gasket assembly having a predetermined radius of curvature with the metal shell and liner being free of undesired buckling or wrinkling.

The circular double-jacketed gasket formed from a substantially linear double-jacketed gasket assembly having a substantially rectangular cross-section including a first metal strip forming a shell having a base portion and side portions with the width dimension of the base portion being greater than the dimension of the side portions, a filler strip of resilient core material confined between said side portions and a second metal strip forming a liner having a base portion overlying the core and substantially the same width dimension as the base portion of the first metal strip with the outer edges of the second metal strip confined by the side portions of the first metal strip, whereby the gasket is formed by the following method steps:

• compressing the base portions of the linear double-jacketed gasket assembly with a substantially even compression between compression rolls;
• curving the linear double-jacketed gasket assembly edgewise in a plane parallel to said base portions a predetermined amount at the nip between the compression rolls to form a uniform, circular gasket assembly having a predetermined radius of curvature with the metal shell and liner being free of undesired buckling or wrinkling;
• severing a circular gasket unit from the gasket assembly;
• and
• securing together the severed ends of the circular gasket unit to form a circular double-jacketed gasket having a single joint connection in the liner and shell about its entire circumference.

The circular double-jacketed gasket formed by the following method steps:

• forming a linear double-jacketed gasket assembly having a substantially rectangular cross-section including a metal shell and metal liner encasing a strip of resilient core material;
• compressing the gasket assembly with a substantially even compression with the greater cross-sectional dimension thereof extending between and along a line parallel to the axes of a pair of compression rolls;
• bending the gasket assembly edgewise in the plane parallel to the bases having the greater dimension a predetermined amount at the nip between the compression rolls to form a circular gasket assembly having a predetermined radius of curvature free of undesired buckling or wrinkling in the metal shell and liner;
• severing a circular gasket unit from the gasket assembly;
• and
• securing together the severed ends of the circular gasket unit to form a circular double-jacketed gasket having a single joint connection in the liner and shell about its entire circumference.

The circular double-jacketed gasket formed from a substantially linear double-jacketed gasket assembly having a substantially rectangular cross-section including a first metal strip forming a shell having a base portion and side portions with the width dimension of the base portion being greater than the dimension of the side portions, a filler strip of resilient core material confined between said side portions and a second metal strip forming a liner having a base portion overlying the core and substantially the same width dimension as the base portion of the shell with the outer edges of the liner confined by the side portions of the shell, whereby the gasket is formed by the following method steps:

• compressing the base portions of gasket assembly with a substantially even compression between compression rolls;
• curving the gasket assembly edgewise in a plane parallel to said base portions a first predetermined amount at the nip between the compression rolls to form a circular gasket assembly having a first predetermined radius of curvature of the finished gasket unit and the metal shell and liner being free of undesired buckling or wrinkling;
• reducing the radius of curvature of the gasket assembly to the radius of curvature of the desired circular gasket unit to relieve stresses in the assembly and provide uniform curvature of the gasket assembly;
• severing a circular gasket unit from the gasket assembly forming a gasket unit having a circumference slightly larger than the desired circumference of the finished gasket;
• and
• welding the severed ends of the shell and the severed ends of the liner in slightly overlapping relationship an amount sufficient to provide the desired circumference of the finished gasket having a single weld joint in the liner and shell above its entire circumference.

The double-jacketed circular metal gasket formed by the following method steps:

• superimposing a first linear metal strip on a second linear metal strip, with a non-metallic flexible linear resilient core strip therebetween, wherein the second strip is wider than the first strip and forms the shell;
• thereafter bending the linear edges of the second strip around the linear edges of the first strip, whereby a gasket assembly is provided with the first strip forming a liner enclosing the core material between the shell and the liner;
• passing the gasket assembly between a first pair of compression rolls and applying substantially even pressure on the gasket assembly at the nip between the rolls;
• exerting a bending force on one linear edge of the gasket assembly at a point beyond the compression rolls while the pressure is applied at the nip between the rolls for forming the gasket assembly into a circular configuration having a predetermined radius and with said one linear edge becoming an outer edge thereof;
• and
• forming a single weld joint about the entire circumference of the liner and shell of the circular double-jacketed gasket assembly to form the circular double-jacketed gasket.

The circular double-jacketed gasket assembly formed by the following method steps:

• forming a double-jacketed linear gasket assembly having a substantially outer rectangular metal casing surrounding an inner core of resilient fibrous material;
• curving the linear gasket assembly edgewise a predetermined amount in the plane of its greater dimension to form a circular gasket assembly having a uniform cross-section free of undesired buckling or wrinkling in the metal shell;
• the step of curving including compressing the gasket assembly in the plane of its greater dimension between compression rolls whose axis of rotation are parallel to said plane;
• curving the gasket assembly edgewise in said plane a predetermined amount at the nip between the compression rolls to form a uniform, circular gasket assembly having a predetermined radius of curvature with the metal shell and liner being free of undesired buckling or wrinkling;
• and
• forming a single weld joint about the entire circumference of the liner and shell of the circular double-jacketed gasket assembly to form a circular double-jacketed gasket.