Press-in place gaskets and fabrication methods
View Patent ↗Gasket stock is disclosed having a rectangular metal core that is readily bendable in one direction and a deformable rubberized jacket coextruded with and encasing the metal core. A method of fabricating the gasket stock through a coextrusion process is disclosed. A method also is disclosed for forming a press-in-place gasket with the method including obtaining bendable gasket stock, incrementally advancing the gasket stock to predetermined positions in a bender, and bending the gasket stock at the predetermined positions along its length to form a desired shape of the press-in-place gasket. The bender is controlled by a computer to form the shape of the gasket according to a CAD or other electronic file. Finally, a method of supplying press-in-place gaskets and accommodating design changes of such gaskets is disclosed.
1. A press-in-place gasket for sealing between two opposed surfaces, at least one of the opposed surfaces having a shaped groove formed therein, the gasket comprising:
an elongate core of stiff but bendably deformable material having a cross sectional profile that readily bends and deforms into a bent shape under application of an applied force within a first plane that is co-planar with a length of the core and maintains the bent shape after release of the applied force, and that resists bending within a second plane that is transverse to the first plane;
a jacket encasing the core, the jacket comprising a compressible material configured to form a seal when compressed between the two opposed surfaces, the core and jacket together forming a gasket stock having a free-standing first shape, and that maintains a free-standing second shape after being deformed by bending and releasing the gasket stock within the first plane; and
a bonded joint joining the compressible material at free ends of a length of the gasket stock to form a closed press-in-place gasket configured for insertion into the shaped groove in the at least one opposed surface.
2. The press-in-place gasket of claim 1 , wherein the length of the gasket stock includes a plurality of shaped bends having angles greater than or about 45 degrees.
3. The press-in-place gasket of claim 2 , wherein at least two of the plurality of shaped bends are in opposite directions within the first plane when moving around the gasket is a single direction.
4. The press-in-place gasket of claim 1 , wherein the free ends are cut at an acute angle relative to the length of the gasket stock.
5. The press-in-place gasket of claim 1 , wherein the first plane and the second plane are substantially perpendicular to each other.
6. The press-in-place gasket of claim 5 , wherein the core is rectangular in cross-section with a long axis perpendicular to the first plane.
7. The press-in-place gasket of claim 1 , wherein the first plane and the second plane are angularly spaced at about a 45 degree angle to each other.
8. The press-in-place gasket of claim 7 , wherein the core is substantially square and bendable in two planes perpendicular to each other.
9. The press-in-place gasket of claim 1 , wherein the stiff but bendably deformable material is selected from the group consisting of aluminum, copper, steel, and a shapeable polymer.
10. The press-in-place gasket of claim 1 , wherein the compressible material is selected from the group consisting of a thermoset rubber, a polymer, an acrylic, a polyacrylic, and a composite.
11. The press-in-place gasket of claim 1 , wherein the gasket stock has a thickness greater than a width.
12. The press-in-place gasket of claim 1 , further comprising protrusions of compressible jacket material extending from the sides of the gasket stock and configured to compress and grip the sidewalls of the shaped groove upon insertion therein.
13. A press-in-place gasket for sealing between two opposed surfaces, at least one of the opposed surfaces having a shaped groove formed therein, the press-in-place gasket comprising:
an elongate strand of gasket stock having a length and ends, the gasket stock comprising:
a core of stiff but bendably deformable material configured to readily bend and deform into a bent shape under application of an applied force within a first plane that is co-planar with the length of the elongate strand and maintain the bent shape after release of the applied force, and to resist bending within a second plane that is transverse to the first plane; and
a jacket encasing the core, the jacket comprising a compressible material configured to form a seal when compressed between the two opposed surfaces,
wherein the gasket stock is configured to maintain a free-standing bent shape after being deformed by bending and releasing the gasket stock within the first plane; and
the ends of the strand being bondable to each other when the strand is bent into a closed configuration form a press-in-place gasket configured for insertion into the shaped groove in the at least one opposed surface.
14. The press-in-place gasket of claim 13 , wherein the free ends are cut at an acute angle relative to the length of the elongate strand.
15. The press-in-place gasket of claim 13 , wherein the first plane and the second plane are substantially perpendicular to each other.
16. The press-in-place gasket of claim 15 , wherein the core is rectangular in cross-section with a long axis perpendicular to the first plane.
17. The press-in-place gasket of claim 13 , wherein the first plane and the second plane are angularly spaced at about a 45 degree angle to each other.
18. The press-in-place gasket of claim 17 , wherein the core is substantially square and bendable in two planes perpendicular to each other.
19. The press-in-place gasket of claim 13 , wherein the stiff but bendably deformable material is selected from the group consisting of aluminum, copper, steel, and a shapeable polymer.
20. The press-in-place gasket of claim 13 , wherein the compressible material is selected from the group consisting of a thermoset rubber, a polymer, an acrylic, a polyacrylic, and a composite.
21. The press-in-place gasket of claim 13 , wherein the gasket stock has a thickness greater than a width.
22. The press-in-place gasket of claim 13 , further comprising protrusions of compressible jacket material extending from the sides of the gasket stock and configured to compress and grip the sidewalls of the shaped groove upon insertion therein.
23. A method of fabricating a press-in-place gasket for sealing between two opposed surfaces, at least one of the opposed surfaces having a shaped groove formed therein, the method comprising:
obtaining a linear gasket stock comprising:
a core of stiff but bendably deformable material configured to readily bend and deform into a bent shape under application of an applied force within a first plane that is co-planar with the length of the gasket stock and maintain the bent shape after release of the applied force, and to resist bending in a second plane that is transverse to the first plane; and
a jacket encasing the core, the jacket comprising a compressible material configured to form a seal when compressed between the two opposed surfaces,
wherein the gasket stock is configured to maintain a free-standing bent shape after being deformed by bending and releasing the gasket stock within the first plane;
advancing the gasket stock to a predetermined position within a bending head aligned with the first plane;
activating the bending head to form a bend in the gasket stock within the first plane at the predetermined position; and
repeating the steps of advancing the gasket stock and activating the bending head to form an additional bend in the gasket stock within the first plane until a desired gasket shape configured for insertion into the shaped groove in the at least one opposed surface is obtained.
24. The method of claim 23 and further comprising:
cutting the gasket stock to form free ends; and
bonding the free ends together to form a closed press-in-place gasket.
25. The method of claim 23 and further comprising:
advancing the gasket stock to a predetermined position within a bending head aligned with a second plane that is perpendicular to the first plane;
activating the additional bending head to form a bend in the gasket stock within the second plane.