Self-retaining, easily removable pneumatic seal
A self-retaining, recessed seal for reception in an open top groove, where the groove is neither configured for seal retention (e.g., convergent side walls), nor provided with seal retention features such as flanges, projections, etc. No adhesives are required, enabling the seal to be easily removed for cleaning, etc. The self-retaining seal has a bottom structure with lateral extensions, wider than the groove, with upwardly angled surfaces at the edges and portions that extend upward when compressed laterally by the walls of the groove. Side walls of the seal extend upward from the bottom structure and are slightly narrower than the groove, to avoid or minimize contact with the groove side walls when the seal is inflated. The configuration enables relatively easy installation of the seal but effectively prevents the seal from “walking” out of the groove over time, with repeated cycles of inflation and deflation.
1. A sealable structure, with a self-retaining inflatable seal configured and constructed for repetitive cycles of inflation and deflation and periodic removal and replacement for servicing, which comprises
a first sealable member formed with an outer surface and a seal-receiving groove open at said outer surface,
said groove having a predetermined depth from said outer surface and a predetermined width and having substantially parallel side walls,
a second sealable member having a sealing surface positionable in opposed, closely spaced relation to the outer surface of said first sealable member, and
a self-retaining, fluid-inflatable seal removably received in said groove, said seal having bottom and top walls and spaced apart side walls connecting said bottom and top walls,
said side walls extending upward with outer surfaces thereof in parallel relation to the side walls of said groove,
said seal, when unpressurized, having a width between outer surfaces of its side walls, which is about 80% to about 90% of the width of said groove,
said seal, when unpressurized, having a height no greater than the depth of said groove,
said seal having a bottom structure comprising said bottom wall and lateral extensions at each side of said bottom wall,
said lateral extensions having an overall width greater than the width of said groove and being deflected upward and inward upon insertion of said seal into said groove,
said bottom structure securing said seal in said groove by frictionally gripping its opposed side walls whether said seal is inflated or deflated.
2. A sealable structure according to claim 1 , wherein,
said lateral extensions have an overall width equal to from about 104% to about 112% of the width of said groove.
3. A sealable structure according to claim 1 , wherein,
lower portions of said lateral extensions are disposed at an angle, extending upward and outward from a bottom thereof.
4. A sealable structure according to claim 3 , wherein,
said lateral extensions are of a triangular cross sectional configuration with outwardly extending upper surface portions and upwardly and outwardly angled lower surface portions convergent with said upper surface portions.
5. A sealable structure according to claim 4 , wherein,
said outwardly extending upper surface portions are horizontally disposed.
6. A sealable structure according to claim 4 , wherein,
the side walls of said seal are recessed inwardly in a region immediately above the outwardly extending upper surface portions of said lateral extensions to accommodate an upward and inward displacement of said lateral extensions when said seal in inserted into said groove.
7. A sealable structure, with a self-retaining inflatable seal, configured and constructed for repetitive cycles of inflation and deflation and periodic removal and replacement for servicing, which comprises
a first sealable member formed with an outer surface and a seal-receiving groove open at said outer surface,
said groove having a predetermined depth from said outer surface and a predetermined width and having substantially parallel side walls,
a second sealable member having a sealing surface positionable in opposed, closely spaced relation to the outer surface of said first sealable member, and
a self-retaining, fluid-inflatable seal received in said groove, said seal having bottom and top walls and spaced apart side walls connecting said bottom and top walls,
said side walls extending upward with outer surfaces thereof in parallel relation to the side walls of said groove, and a width between outer surfaces of its side walls, which is less than the width of said groove,
said seal, when unpressurized, having a height which is less than a space between the bottom of said groove and the sealing surface of said second sealable member,
said seal having a bottom structure comprising said bottom wall and lateral extensions at each side of said bottom wall projecting laterally beyond said outer side wall surfaces,
said lateral extensions having an overall width greater than the width of said groove and having a frictional grip on opposed side walls of said groove whether said seal is inflated or deflated.
8. A sealable structure according to claim 7 , wherein,
said seal, when unpressurized, has a width between outer surfaces of its side walls which is about 80% to about 90% of the width of said groove.
9. A sealable structure according to claim 7 , wherein,
said lateral extensions have an overall width equal to from about 104% to about 112% of the width of said groove.
10. A sealable structure according to claim 9 , wherein,
said lateral extensions have bottom surfaces extending upwardly and outwardly from a bottom of said seal and converging with top surfaces of said lateral extensions, and
said lateral extensions are displaced upward and inward when said seal in inserted into said groove.
11. A sealable structure according to claim 10 , wherein,
the side walls of said seal are recessed inwardly in a region immediately above the outwardly extending top surfaces of said lateral extensions to accommodate the upward and inward displacement of said lateral extensions when said seal in inserted into said groove.
12. A sealable structure according to claim 7 , wherein
the walls of said seal are configured such that the expansion of said seal, when pressurized, is principally vertical.
13. A self-retaining, fluid-inflatable seal configured for reception within a groove of predetermined width and predetermined height, configured and constructed for repetitive cycles of inflation and deflation and periodic removal and replacement for servicing, said seal comprising
an extruded length of elastomeric material having spaced apart top and bottom walls, opposed spaced apart side walls and a hollow interior,
said seal having a configuration such that, upon pressurization, its expansion is principally between its top and bottom walls,
a width of said seal, between outer surfaces of its side walls, being less than said predetermined groove width,
a bottom structure of said seal comprising said bottom wall and lateral extensions projecting from opposite sides of said bottom wall, said lateral extensions having an overall width greater than said predetermined groove width for frictional gripping engagement with side walls of a groove of said predetermined width,
said bottom structure serving to secure said seal in such groove of predetermined width whether said seal is inflated or deflated,
said seal being configured such that, when pressurized within designed operating pressures, its side walls will have little to no contact with side walls of a groove of said predetermined width while space between said top and bottom walls is enlarged to position said top wall for engagement with a surface to be sealed for effecting a sealing action with said surface.
14. A self-retaining seal according to claim 13 , wherein
said seal, when unpressurized, has a width between outer surfaces of its side walls of about 80% to about 90% of said predetermined width.
15. A self-retaining seal according to claim 13 , wherein
said lateral extensions have an overall width equal to from about 104% to about 112% of said predetermined width.
16. A self-retaining seal according to claim 13 , wherein
said seal, when unpressurized, has an overall height between outer surfaces of its top and bottom walls which is less than said predetermined height.
17. A self-retaining seal according to claim 13 , wherein
said lateral extensions are of a tapered configuration, with bottom walls thereof extending upward and outward and converging with top walls thereof, and
said lateral extensions are configured to be displaced upwardly and inwardly when said seal is inserted in a groove of said predetermined width.
18. A self-retaining seal according to claim 17 , wherein
said side walls are recessed in regions directly above said lateral extensions.