US20170305523A1 - Gasket having a pliable resilient body with a perimeter having characteristics different than the body - Google Patents
Gasket having a pliable resilient body with a perimeter having characteristics different than the body Download PDFInfo
- Publication number
- US20170305523A1 US20170305523A1 US15/646,888 US201715646888A US2017305523A1 US 20170305523 A1 US20170305523 A1 US 20170305523A1 US 201715646888 A US201715646888 A US 201715646888A US 2017305523 A1 US2017305523 A1 US 2017305523A1
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Links
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Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
- F16J15/121—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
- F16J15/122—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement generally parallel to the surfaces
- F16J15/123—Details relating to the edges of the packing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
Definitions
- Gaskets including aircraft gaskets, having a perimeter of greater firmness than the non-perimeter, more tacky portion thereof.
- Gaskets provide a mechanical seal that fills the space between two mating surfaces. They may be provided to prevent leakage from or into the pieces under compression. Gaskets typically can allow less than perfect mating surfaces on machine parts where they can fill irregularities. Gaskets are commonly produced from cutting sheet materials, such as gasket paper, rubber, silicon, metal, cork, felt, neoprene, nitrile rubber, fiberglass or plastic polymer, such as polychloro, trifloro ethylene.
- Pre-cured polyurethane and antenna gaskets have been provided with aluminum skeletal carrier die cut to fit the workpiece, such as an aircraft antenna.
- the polyurethane provides an effective environmental sealant. It also demonstrates excellent cohesion after installation and provides a high degree of environmental protection, still allowing for easy removal of the workpiece.
- Polyurethane provides a non-hazardous seal with no silicon oil residue before, during or after installation or removal. Moreover, polyurethane is not problematic with paint adhesion or preparation and there is no peripheral silicon contamination. Polyurethane provides a positive moisture barrier for easy workpiece removal and provides noise and vibration dampening.
- some polyurethane may creep under compression creating an overrun outside the gasket area. This may sometimes require manual removal.
- Applicants' device features a single piece gasket having a skeletal member having a pliable body, wherein the pliable body typically includes a first portion having a first firmness and a second, perimeter portion, having a firmer consistency.
- the perimeter will tend to limit the flow of the softer inner material past the firmer perimeter region or portion of the gasket. In this manner, creep or overrun of the less firm first portion material will be substantially reduced or eliminated.
- a dual firmness body such as a polyurethane body
- a dual firmness body will have a first firmness of a first portion of the body and a firmer consistency and resistant to compression over a perimeter or second region, which second or perimeter region typically conforms to the outer edges of the workpiece.
- FIG. 1 is a side elevational cutaway view of one embodiment of prior art gaskets as taught by the following U.S. Pat. Nos. 7,229,516; 6,695,320; and 6,530,577, all of which are incorporated herein by reference.
- FIG. 2 is an exploded side elevational view of a prior art gasket, such as that in FIG. 1 used under compression between a workpiece WP and a base.
- FIG. 3 is the illustration of FIG. 2 , with the gasket in place and under compression between the workpiece and the base, illustrating overrun “OR” of some of the gasket material where it has seeped out past the edge of the workpiece outer perimeter.
- FIG. 4A is a side, cutaway elevational view of a first embodiment of Applicants' dual firmness gasket having a skeletal member.
- FIG. 4B illustrates a side elevational view in cross-section of first embodiment of Applicants' new gasket and the manner in which it aligns with the workpiece outer perimeter prior to compression between the workpiece and the base.
- FIG. 4C illustrates the first embodiment in an “overcut application of Applicants' improved gasket in a side elevational view illustrating the relationship between the firmer perimeter of the gasket and the perimeter of the workpiece prior to compression, wherein the outer perimeter of the gasket extends slightly beyond the outer perimeter of the workpiece.
- FIG. 4D illustrates the first embodiment in an “undercut” application of Applicants' improved gasket wherein the firmer outer perimeter of the gasket is undercut and wherein prior to compression the outer perimeter of the workpiece extends slightly beyond the outer perimeter of the gasket.
- FIGS. 4E and 4F illustrate side elevational views of an embodiment of Applicants' invention having a separate perimeter member, engageable after attachment of workpiece and gasket to the base.
- FIG. 5 illustrates a side elevational view of a first embodiment of Applicants' improved gasket as set forth in FIGS. 4A and 4B , under compression between a workpiece and a base, illustrating the manner in which the firmer outer perimeter reduces seepage or overrun along the outer perimeter of the workpiece.
- FIG. 6 illustrates a side cutaway perspective view of a second embodiment of Applicants' improved gasket.
- FIG. 7 is an illustration of the embodiment of FIG. 6 under compression between a workpiece and a base.
- FIG. 8 illustrates a third embodiment of Applicants' improved gasket in side cross-sectional elevational view.
- FIG. 9 illustrates a cross-sectional view of the gasket set forth in FIG. 8 , under compression showing the edge of a workpiece and the edge of a base.
- FIG. 10 is a fourth embodiment of Applicants' present invention in cross-sectional elevational view.
- FIG. 11 illustrates the embodiment of FIG. 10 under compression between a workpiece and a base, along the edge of the workpiece.
- FIG. 12 illustrates a fifth embodiment of Applicants' improved gasket in cross-sectional elevational view.
- FIG. 13 illustrates the embodiment of FIG. 12 in cross-sectional elevational view under compression at or near the perimeter of a workpiece.
- FIG. 14 illustrates a sixth embodiment of Applicants' present invention in cross-sectional side elevational view.
- FIG. 15 illustrates the gasket of FIG. 14 under compression between the workpiece and a base, near the edge of the workpiece.
- FIGS. 16A and 16B illustrate in cross-sectional view a manner of manufacturing the first embodiment of Applicants' device.
- FIGS. 17A and 17B illustrate in cross-sectional elevational view a method of making the second embodiment of Applicants' improved gasket.
- FIGS. 18A and 18B illustrate in cross-sectional view, a method of making the third embodiment of Applicants' present invention.
- FIGS. 19A and 19B illustrate in cross-sectional side elevation, a method of making the fourth embodiment of Applicants' gasket.
- FIGS. 20A and 20B illustrate a method of making the fifth embodiment of Applicants' improved gasket.
- FIGS. 21A and 21B illustrate a method of making the sixth embodiment of Applicants' improved gasket.
- FIG. 22 illustrates an exposed skeleton, beyond the body of the gasket being made by the use of a mold.
- FIG. 23 illustrates the cured, exposed skeleton gasket made by the step illustrated in FIG. 22 aligned with a workpiece which will be applied to a base.
- FIG. 24 illustrates the gasket of FIGS. 22 and 23 , under compression between the workpiece and base.
- FIG. 24A illustrates a gasket under compression between the workpiece and base, but leaving an exposed skeleton and a gap.
- FIG. 24B illustrates a gasket under compression leaving a gap, but no exposed skeleton.
- FIG. 25 illustrates the application of a bead to the embodiment of FIG. 24 .
- FIG. 25A illustrates the application of a bead to the embodiment of FIG. 24A .
- FIG. 25B illustrates the application of a bead to the embodiment of FIG. 24B .
- FIG. 26 illustrates a bead being shaped in an optional step, which shaping may be applied to any of the foregoing gap, gapless, exposed, non-exposed skeleton embodiments.
- FIG. 27 illustrates the cured bead integral with the body and adjacent, typically contacting the workpiece and base.
- FIGS. 4A thru 4 D illustrate a first embodiment 10 a of Applicants' improved gasket.
- Gasket 10 a like the embodiments that follow, will provide for a workpiece WP to Base mechanical seal over substantially the entire surface of the workpiece and the base beneath the workpiece.
- Gasket 10 a comprises of a resilient body 12 , typically made from pre-cured polyurethane gasket material, such as KBS, Fort Worth, Tex., as disclosed in the patents that are incorporated by reference.
- Body 12 is seen to have a first portion 14 having a first firmness, such as a firmness between about 75 and about 150 (measured with a 37.5 g half cone penetrometer).
- the second firmer perimeter portion 16 is seen to comprise the outer perimeter of the gasket, which generally mimics the shape of the outer perimeter of the workpiece, in which second firmer perimeter portion 16 may have a durometer hardness “00” of between about 15 and about 75.
- the perimeter portion may be made from HT3326-5 and the body or inner portion may be made from a mix of P-1011 and U-1010. This will provide a gasket within the firmness range set forth in this paragraph.
- first portion to the second portion is one of typically close, adjacent, contiguous integral and/or intimate relation of one portion with respect to the other along common face 23 . That is to say, they lay adjacent one another and indeed may intermingle one portion to the other at least close to the boundary portion or common face 23 between the first and second portions.
- first, less firm portion 14 may be typically tabular in nature
- the second firmer perimeter portion 16 may take a number of cross-sectional configurations. These configurations may be varied, first to provide an effective seal, under compression, against overrun of the first portion outside the boundaries generally defined by the second perimeter portion, as well as to provide an effective and an aesthetically pleasing mechanical seal.
- a bead portion, or more generally, a formed portion extending beyond the perimeter of the workpiece is provided.
- Applicants provide for a number of cross-sectional configurations to the second, firmer perimeter portion 16 , which are designed to provide both an effective seal and/or a visually pleasing perimeter. This is achieved, in part, by providing a second material at an outer perimeter having a firmer consistency, while being substantially integral with the first portion 14 .
- Some embodiments of Applicants' gaskets disclosed herein have configured second portions 16 as more generally described hereinbelow.
- the shapes may generally be described as: 10 a tabular; 10 b tabular (with raised lips); 10 c curved (convex); 10 d toothed or ribbed; 10 e curved (concave); and 10 f trapezoid.
- a flexible skeleton 18 / 20 is provided.
- the flexible skeleton 18 / 20 is in the embodiment illustrated in FIG. 4A
- a mesh skeleton 18 such as woven 5056 aluminum alloy for conductive applications or woven fiberglass for non-conductive applications, or as seen in FIG. 4B , may be seen to be a non-mesh, flexible solid fabric 20 , such as polytetrafluoroethylene (PTFE) or any suitable material.
- PTFE polytetrafluoroethylene
- the skeletal member is usually substantially encapsulated in the resilient body 12 and may add strength to the gasket as well as integrity between portions 14 / 16 as, seen in the illustrations, the skeletons 18 / 20 typically extend substantially throughout first portion 14 and typically, at least partially, into perimeter or second portion 16 .
- the first embodiment of Applicants' device provides a relatively narrow second portion 16 in cross-section 24 A, at least compared to the first portion, which second portion 16 may have a width of about 75 to about 250 mil.
- the pre-compression thickness of first and second portions is the same, typically about 55 mil (range 25-100 mil).
- the other embodiments may have similar or different dimensions.
- FIGS. 4A-4D may take, positionally, one of the three locations with respect to the pre-compression of the gasket adjacent the workpiece.
- improved gasket 10 a may be dimensioned, for example, die cut or molded, such that the outer edge of the second portion 16 is vertically aligned with the outer edge of the workpiece, such as the outer edge of an aircraft antenna, attached to a base which may represent the fuselage of the aircraft.
- FIG. 4B the cut of the gasket with respect to the workpiece will be called straight or regular cut.
- body 12 typically second portion 18 thereof and, optionally, skeleton 18 / 20 extends pre-compression slightly beyond the outer edge of the workpiece of the gasket.
- the gasket of FIG. 4C may be termed “overcut.”
- FIG. 4D an “undercut” gasket may be seen wherein the outer edge of the outer perimeter portion 16 and skeleton 18 / 20 does not reach, pre-compression, the outer edge of the workpiece.
- the straight or regular cut gasket may be desired where there is only a slight bulge desired, post-compression, of the gasket at the workpiece perimeter.
- a slight overcut gasket may be provided to improve the aesthetics of the sealing adjacent the workpiece base and outer perimeter area see in FIG. 4C .
- undercut gasket 10 a may be used for a number of reasons, including the ability to leave a slight gap post-compression for the insertion of a second material or a second gasket 25 , bead or an O-ring or the like in the gap G created between the workpiece and Base (outer edge) post-compression.
- FIGS. 4E and 4F illustrate the embodiment of Applicants' device using an undercut pre-cured gasket 10 a , which may be a gasket comprised of a pre-cured sticky gasket 10 g of either the single or dual firmness. It is undercut and even under compression may leave a small gap G, that is, a recess back from the outer edge of the workpiece.
- Applicants may provide a pre-cured, preformed elastomeric second gasket 25 .
- Second gasket 25 is configured to lay adjacent the outer perimeter of pre-cured gasket 10 a . Workpiece is placed under slight compression and an elastic UV resistant gasket 25 is urged at least partially into gap G. Further compression may be applied to allow some of the body 12 to be squeezed up to the inner boundaries of undercut gasket 10 a and also allow the outer edge of second gasket 25 to protrude from gap G as seen in FIG. 4F .
- the undercut of FIG. 4D may be limited to from several mil up to about 250 mil, in which case, under compression, the expansion of the second portion 15 may move it out slightly so it is flush with the outer edge of the workpiece.
- the undercut may remain under either partial or full compression and a flowable curable polyurethane or other suitable material may be applied at the gap at the undercut (see below). The applied material may itself provide a bead beyond the edge of the workpiece.
- FIGS. 6, 8, 10, 12, and 14 illustrate additional embodiments (two through six) 10 b , 10 c , 10 d , 10 e , and 10 f , respectively, of Applicants' improved gaskets, each illustrating differences in the shape of second portion 16 may take as set forth in more detail below.
- a more effective seal may be provided, as may be needed in different applications. Further, the post-compression visual aesthetics of the seal may be enhanced.
- any of the embodiments 10 a - 10 f may be straight cut, undercut or overcut as needed for effective sealing and/or aesthetic purposes. Moreover, it is seen that any of the embodiments may have a differential firmness wherein the softer first portion 14 has a first or greater tackiness than the outer portion 16 , which may be firmer and less tacky.
- FIG. 6 illustrates a cross-sectional shaped perimeter 24 b of the second flexible firmer outer portion 16 at the perimeter of the body 12 of embodiment 10 b .
- Cross-section 24 b is seen to be similar to cross-section 24 a of embodiment 10 a (see FIG. 4E ).
- Cross-section 24 a has three generally straight sides and a common face 23 and a thickness approximately equal to the first portion 14 .
- Cross-section 24 b of embodiment 10 b (see FIG. 6 ) is seen to have an upper lip 26 a and a lower lip 26 b extending above and below the top surface 14 a and bottom surface 14 b of the first portion 14 .
- Lips 26 a / 26 b may extend several mil (or typically up to about 20 mil) above the thickness of first portion 14 defined as the distance between top surface 14 a and bottom surface 14 b thereof.
- the overall thickness T of the regular sided rectangle seen in cross-section 24 b is about 75 mil (range about 25 mil to 100 mil) or any other suitable thickness.
- FIG. 7 illustrates that a regular cut or slightly overcut embodiment 10 b of Applicants' improved gasket may provide a slightly contoured or bulging profile, seen in cross-section across the outer edge of the workpiece.
- Gasket 10 b is seen under compression between a workpiece which may be an aircraft antenna and a base which may be an aircraft fuselage.
- FIGS. 8 and 9 illustrate a perimeter cross-section 24 c that is seen to be plano-convex gasket 10 c .
- a convex section 30 covers an arc typically greater than 90° and a planar section 32 represents an extension of bottom surface 14 b .
- An adhesive strip 28 such as double sided tape, may be provided along planar section 32 on this embodiment or any other embodiment, which may provide for pre-compression placement and positioning of any of the improved gaskets against either the workpiece or the base prior to compression.
- FIG. 9 illustrates one configuration that the embodiment illustrated in FIG. 8 , embodiment 10 c of Applicants' improved gasket, may take under compression between the workpiece and base.
- a rounded surface, in profile, may be seen extending slightly beyond the edge of the workpiece.
- the increased thickness of the second portions are believed to, in part, provide greater resistance to the migration of the soft material of first portion 14 and the prevention of overrun outside the outer perimeter of Applicants' dual firmness or composite gasket.
- a ribbed toothed surface 34 is provided as seen in cross-section 24 d , as either an upper or a lower surface of the perimeter portion 16 (ribbed toothed upper surface shown).
- the toothed upper surface may help prevent creep or overrun of the material comprising the first portion 14 as it provides ridges that will flatten somewhat under compression.
- improved gasket 10 d may include an upstanding wall portion 36 may be provided in the overcut area for both aesthetic and creep prevention.
- FIG. 11 it is seen how outer walled portion 36 may be contoured to fit snugly adjacent the outer perimeter of the workpiece.
- the cross-sectional view seen in FIG. 10 may be termed a toothed-wall.
- Embodiment 10 e may be seen to provide a perimeter portion 16 that is multi-concave in cross-section 24 e , here having concave top and bottom walls and, optionally, a concave outer wall. This may provide for a slight concavity to the post-compression shape and sealing against the surface of the workpiece as illustrated in FIG. 13 .
- FIGS. 14 and 15 illustrate the use of double adhesive strip 26 on a top wall of perimeter portion 16 and another embodiment 10 f with a shaped cross-section 24 f , here having a trapezoid (parallelogram) or quadrilateral shape with the face opposite common face 23 being slanted, typically outward from the top to bottom. While the thickness of outer portion 16 is illustrated to be the same as inner portion 14 , outer portion 16 may be thicker. As in other embodiments, the embodiment 10 f of Applicants' improved gasket may be either straight cut, undercut or slightly overcut. In FIG. 15 , embodiment 10 f is illustrated under compression.
- FIGS. 16A thru 21 B illustrate methods of preparing Applicants' various embodiments of their improved gasket.
- FIGS. 16A and 16B illustrate a cross-sectional view in which a two-piece mold or multi-piece mold 50 is provided for embodiment 10 a , wherein multi-piece mold 50 is defined by a top divider 52 and a bottom divider 54 , with a gap 56 therebetween for the skeleton to protrude through.
- the two separate pieces are provided in a base 55 providing an upstanding bottom divider 54 and an outside wall 57 .
- a second piece may include top divider 52 , which along with bottom divider 54 , will be typically very thin metal, which may be either solid or perforated to allow flow of the first material comprising first portion 14 and a second material providing the second portion 16 thereof, so there may be intermingling during cure.
- a cap 53 including top divider 52 , may be removed and, to start the procedure, skeleton 18 / 20 is placed across base 53 supported on the top edge of bottom divider 54 and extending partway past bottom divider 54 into space that will be filled with the second (firmer) composition.
- the first composition may then be poured pre-mixed in the snout S of the applicator A in known ways, and allowed to self-level to the desired height, here H 14 and H 16 being equal.
- cap 53 and top divider 52 are removed leaving the cross-section illustrated in FIG. 15B .
- applicator A this time having second material, a composition firmer than the composition of the first material, will be applied to level H 16 .
- the gasket 10 a can be carefully removed and is ready for use.
- FIGS. 17A and 17B illustrate similar procedures, which can be used when H 16 is greater than H 14 , for embodiment 10 b .
- top divider 52 , bottom divider 54 , and gap 56 add up to a height of about H 16 .
- perimeter 16 can be poured first, allowed to cure and, after removal of top divider 16 , the first portion 14 can be injected to a height of approximately H 14 leaving, when cured, a gasket substantially resembling embodiment 10 b with a cross-section 24 b.
- FIGS. 18A and 18B illustrate a manner in which a two-piece base 55 having lower portion 55 a and upper portion 55 b may be joined together to provide the curved section of embodiment 10 C.
- outer portion 16 may be injected first and then inner portion 14 may be injected to the desired height.
- Portion 55 b of base 55 may be removed for ease of removal of the gasket embodiment 10 c having cross-section 24 c following curing of both portions 14 / 16 .
- FIGS. 19A and 19B also disclose the two-step method and two piece molds of the previous embodiment providing a first pouring or injecting of one of the first or second portions when the top divider and bottom divider are adjacent one another and a second pouring of the other or first or second portion following the removal of the top divider.
- base 55 is provided with a surface that is shaped to conform to the desired shape of outer portion 16 , here, see 24 d of embodiment 10 d.
- FIGS. 20A, 20B, 21A, and 21B also illustrate a manner of configuring the mold, typically in two pieces, to conform to the desired end product having a specifically configured first portion 14 and a second portion 16 of a different, harder consistency.
- FIG. 20A illustrates top divider and bottom divider working together to provide a perimeter region in which a flowable, pre-cured mix can be injected to provide a proper or suitable shape to the firmer portion, while allowing some of the skeleton to extend into the perimeter portion.
- a flowable, pre-cured mix can be injected to provide a proper or suitable shape to the firmer portion, while allowing some of the skeleton to extend into the perimeter portion.
- FIG. 21 illustrates a similar process, but the top divider is not needed to provide full coverage as the moldable material may self-level as indicated.
- a gasket 10 g is represented.
- This gasket may be any of the dual tackiness and/or firmness as set forth herein.
- the gasket 10 g may be any of the gaskets of the prior art, but with features set herein, including exposed or non-exposed skeleton and undercut or straight cut features.
- a bead 58 will be applied to the outer edge of body 12 .
- the bead is not cured, and will cure in place after the (cured) gasket is between the workpiece and base.
- the bead is typically forced into a gap G left b the body of the gasket not reaching the edge of the workpiece.
- the skeleton 18 / 20 may or may not extend beyond the outer edge of the body. When it does, it will help bead 58 adhere to the gasket.
- FIG. 22 illustrates the preparation of a gasket 10 g, wherein the gasket's skeleton 18 / 20 extends beyond the outer edges of body 12 .
- gasket 10 g which may be either of a single or dual tackiness as set forth above, may be undercut with respect to the workpiece. Typically, however, the bare edges of skeleton 18 / 20 will go up to the edge of the workpiece as illustrated in FIG. 23 .
- gasket 10 g is seen under sufficient compression such that some of the material comprising body 12 will ooze out to about the edge of the workpiece.
- FIG. 24A illustrates an embodiment of the undercut exposed skeleton gasket embodiment 10 g, which may be either single or dual tackiness, wherein under some or complete compression material of body 12 does not reach the outer edge of the workpiece.
- any of the early embodiments are illustrated in an undercut configuration (no exposed skeleton) when a gap G is left even after compression (either partial or complete) of the workpiece against the base.
- bead 58 may be applied through snout S of an applicator applying a curable mix that will cure after application.
- the material used for the bead will typically be UV resistant and bond to the body 12 of the gasket 10 g.
- One such curable mix from which bead may be made of a polysulfide which has suitable adhesion to a polyurethane body and which is somewhat UV resistant.
- FIG. 26 illustrates the use of a shaping tool ST prior to curing of the bead to shape and to remove excess bead material from the contact between the workpiece, the base, and the edge of gasket 10 g.
- bead 58 may be applied to the gap G when an undercut gasket is provided that has an exposed skeleton 18 / 20 as in FIG. 25A .
- the term “undercut” here is used to describe an undercut of the body material 12 where, even under compression, the body material leaves a gap between it and the edge of the workpiece. Such a gap is then filled after the workpiece and gasket are placed on the base (see FIG. 25 ), with a suitable bead material to be cured with the workpiece in place.
- This bead material may be shaped as illustrated in FIG. 26 or otherwise formed into a suitable shape. In FIG.
- undercut refers to the gasket under compression, wherein neither the skeletal material nor the body reaches the edge of the workpiece.
- the gap is filled with the bead 58 (which may extend beyond the edge of the workpiece) as in FIGS. 25 and 25A , and may be shaped.
- FIG. 27 illustrates the final cured bead 58 adjacent to and sealed against gasket 10 g, workpiece WP, and the base.
- the bead is typically firmer and/or less tacky than body 12 .
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Abstract
Description
- This application is a continuation U.S. patent application Ser. No. 13/469,603, filed May 11, 2012, and now issued as U.S. Pat. No. 9,701,388, which claims priority to U.S. Patent Application No. 61/484,879, filed May 11, 2011. These priority applications are herein incorporated by reference as well as U.S. Pat. Nos. 6,530,577; 6,695,320; and 7,229,516.
- Gaskets, including aircraft gaskets, having a perimeter of greater firmness than the non-perimeter, more tacky portion thereof.
- Gaskets provide a mechanical seal that fills the space between two mating surfaces. They may be provided to prevent leakage from or into the pieces under compression. Gaskets typically can allow less than perfect mating surfaces on machine parts where they can fill irregularities. Gaskets are commonly produced from cutting sheet materials, such as gasket paper, rubber, silicon, metal, cork, felt, neoprene, nitrile rubber, fiberglass or plastic polymer, such as polychloro, trifloro ethylene.
- Pre-cured polyurethane and antenna gaskets have been provided with aluminum skeletal carrier die cut to fit the workpiece, such as an aircraft antenna. The polyurethane provides an effective environmental sealant. It also demonstrates excellent cohesion after installation and provides a high degree of environmental protection, still allowing for easy removal of the workpiece.
- Polyurethane provides a non-hazardous seal with no silicon oil residue before, during or after installation or removal. Moreover, polyurethane is not problematic with paint adhesion or preparation and there is no peripheral silicon contamination. Polyurethane provides a positive moisture barrier for easy workpiece removal and provides noise and vibration dampening.
- In some applications, however, some polyurethane may creep under compression creating an overrun outside the gasket area. This may sometimes require manual removal.
- Various embodiments of Applicants' device are enclosed, which feature a single piece gasket having a skeletal member having a pliable body, wherein the pliable body typically includes a first portion having a first firmness and a second, perimeter portion, having a firmer consistency. When such a composite body is placed under compression, the perimeter will tend to limit the flow of the softer inner material past the firmer perimeter region or portion of the gasket. In this manner, creep or overrun of the less firm first portion material will be substantially reduced or eliminated.
- Thus, in one version of Applicants' embodiment, a dual firmness body, such as a polyurethane body, will have a first firmness of a first portion of the body and a firmer consistency and resistant to compression over a perimeter or second region, which second or perimeter region typically conforms to the outer edges of the workpiece.
-
FIG. 1 is a side elevational cutaway view of one embodiment of prior art gaskets as taught by the following U.S. Pat. Nos. 7,229,516; 6,695,320; and 6,530,577, all of which are incorporated herein by reference. -
FIG. 2 is an exploded side elevational view of a prior art gasket, such as that inFIG. 1 used under compression between a workpiece WP and a base. -
FIG. 3 is the illustration ofFIG. 2 , with the gasket in place and under compression between the workpiece and the base, illustrating overrun “OR” of some of the gasket material where it has seeped out past the edge of the workpiece outer perimeter. -
FIG. 4A is a side, cutaway elevational view of a first embodiment of Applicants' dual firmness gasket having a skeletal member. -
FIG. 4B illustrates a side elevational view in cross-section of first embodiment of Applicants' new gasket and the manner in which it aligns with the workpiece outer perimeter prior to compression between the workpiece and the base. -
FIG. 4C illustrates the first embodiment in an “overcut application of Applicants' improved gasket in a side elevational view illustrating the relationship between the firmer perimeter of the gasket and the perimeter of the workpiece prior to compression, wherein the outer perimeter of the gasket extends slightly beyond the outer perimeter of the workpiece. -
FIG. 4D illustrates the first embodiment in an “undercut” application of Applicants' improved gasket wherein the firmer outer perimeter of the gasket is undercut and wherein prior to compression the outer perimeter of the workpiece extends slightly beyond the outer perimeter of the gasket. -
FIGS. 4E and 4F illustrate side elevational views of an embodiment of Applicants' invention having a separate perimeter member, engageable after attachment of workpiece and gasket to the base. -
FIG. 5 illustrates a side elevational view of a first embodiment of Applicants' improved gasket as set forth inFIGS. 4A and 4B , under compression between a workpiece and a base, illustrating the manner in which the firmer outer perimeter reduces seepage or overrun along the outer perimeter of the workpiece. -
FIG. 6 illustrates a side cutaway perspective view of a second embodiment of Applicants' improved gasket. -
FIG. 7 is an illustration of the embodiment ofFIG. 6 under compression between a workpiece and a base. -
FIG. 8 illustrates a third embodiment of Applicants' improved gasket in side cross-sectional elevational view. -
FIG. 9 illustrates a cross-sectional view of the gasket set forth inFIG. 8 , under compression showing the edge of a workpiece and the edge of a base. -
FIG. 10 is a fourth embodiment of Applicants' present invention in cross-sectional elevational view. -
FIG. 11 illustrates the embodiment ofFIG. 10 under compression between a workpiece and a base, along the edge of the workpiece. -
FIG. 12 illustrates a fifth embodiment of Applicants' improved gasket in cross-sectional elevational view. -
FIG. 13 illustrates the embodiment ofFIG. 12 in cross-sectional elevational view under compression at or near the perimeter of a workpiece. -
FIG. 14 illustrates a sixth embodiment of Applicants' present invention in cross-sectional side elevational view. -
FIG. 15 illustrates the gasket ofFIG. 14 under compression between the workpiece and a base, near the edge of the workpiece. -
FIGS. 16A and 16B illustrate in cross-sectional view a manner of manufacturing the first embodiment of Applicants' device. -
FIGS. 17A and 17B illustrate in cross-sectional elevational view a method of making the second embodiment of Applicants' improved gasket. -
FIGS. 18A and 18B illustrate in cross-sectional view, a method of making the third embodiment of Applicants' present invention. -
FIGS. 19A and 19B illustrate in cross-sectional side elevation, a method of making the fourth embodiment of Applicants' gasket. -
FIGS. 20A and 20B illustrate a method of making the fifth embodiment of Applicants' improved gasket. -
FIGS. 21A and 21B illustrate a method of making the sixth embodiment of Applicants' improved gasket. -
FIG. 22 illustrates an exposed skeleton, beyond the body of the gasket being made by the use of a mold. -
FIG. 23 illustrates the cured, exposed skeleton gasket made by the step illustrated inFIG. 22 aligned with a workpiece which will be applied to a base. -
FIG. 24 illustrates the gasket ofFIGS. 22 and 23 , under compression between the workpiece and base. -
FIG. 24A illustrates a gasket under compression between the workpiece and base, but leaving an exposed skeleton and a gap. -
FIG. 24B illustrates a gasket under compression leaving a gap, but no exposed skeleton. -
FIG. 25 illustrates the application of a bead to the embodiment ofFIG. 24 . -
FIG. 25A illustrates the application of a bead to the embodiment ofFIG. 24A . -
FIG. 25B illustrates the application of a bead to the embodiment ofFIG. 24B . -
FIG. 26 illustrates a bead being shaped in an optional step, which shaping may be applied to any of the foregoing gap, gapless, exposed, non-exposed skeleton embodiments. -
FIG. 27 illustrates the cured bead integral with the body and adjacent, typically contacting the workpiece and base. -
FIGS. 4A thru 4D illustrate afirst embodiment 10 a of Applicants' improved gasket.Gasket 10 a, like the embodiments that follow, will provide for a workpiece WP to Base mechanical seal over substantially the entire surface of the workpiece and the base beneath the workpiece. - The pre-compression thickness of the embodiments set forth herein may be about 55 mil (range about 25-100 mil).
Gasket 10 a comprises of aresilient body 12, typically made from pre-cured polyurethane gasket material, such as KBS, Fort Worth, Tex., as disclosed in the patents that are incorporated by reference.Body 12 is seen to have afirst portion 14 having a first firmness, such as a firmness between about 75 and about 150 (measured with a 37.5 g half cone penetrometer). The secondfirmer perimeter portion 16 is seen to comprise the outer perimeter of the gasket, which generally mimics the shape of the outer perimeter of the workpiece, in which secondfirmer perimeter portion 16 may have a durometer hardness “00” of between about 15 and about 75. The perimeter portion may be made from HT3326-5 and the body or inner portion may be made from a mix of P-1011 and U-1010. This will provide a gasket within the firmness range set forth in this paragraph. - It is seen that the relationship of the first portion to the second portion is one of typically close, adjacent, contiguous integral and/or intimate relation of one portion with respect to the other along
common face 23. That is to say, they lay adjacent one another and indeed may intermingle one portion to the other at least close to the boundary portion orcommon face 23 between the first and second portions. Moreover, it is seen with reference toFIGS. 6, 8, 10, 12, and 14 that, while the first, lessfirm portion 14 may be typically tabular in nature, the secondfirmer perimeter portion 16 may take a number of cross-sectional configurations. These configurations may be varied, first to provide an effective seal, under compression, against overrun of the first portion outside the boundaries generally defined by the second perimeter portion, as well as to provide an effective and an aesthetically pleasing mechanical seal. In some cases, a bead portion, or more generally, a formed portion extending beyond the perimeter of the workpiece (see, for example, the detail view ofFIG. 7 ) is provided. - That is to say, Applicants provide for a number of cross-sectional configurations to the second,
firmer perimeter portion 16, which are designed to provide both an effective seal and/or a visually pleasing perimeter. This is achieved, in part, by providing a second material at an outer perimeter having a firmer consistency, while being substantially integral with thefirst portion 14. - Some embodiments of Applicants' gaskets disclosed herein have configured
second portions 16 as more generally described hereinbelow. The shapes may generally be described as: 10 a tabular; 10 b tabular (with raised lips); 10 c curved (convex); 10 d toothed or ribbed; 10 e curved (concave); and 10 f trapezoid. - In the embodiments illustrated, a
flexible skeleton 18/20 is provided. Theflexible skeleton 18/20 is in the embodiment illustrated inFIG. 4A , amesh skeleton 18, such as woven 5056 aluminum alloy for conductive applications or woven fiberglass for non-conductive applications, or as seen inFIG. 4B , may be seen to be a non-mesh, flexiblesolid fabric 20, such as polytetrafluoroethylene (PTFE) or any suitable material. - In either form of
flexible skeleton 18/20, it is seen that the skeletal member is usually substantially encapsulated in theresilient body 12 and may add strength to the gasket as well as integrity betweenportions 14/16 as, seen in the illustrations, theskeletons 18/20 typically extend substantially throughoutfirst portion 14 and typically, at least partially, into perimeter orsecond portion 16. - Turning to
FIGS. 4A and 4B , it is seen that the first embodiment of Applicants' device provides a relatively narrowsecond portion 16 in cross-section 24A, at least compared to the first portion, whichsecond portion 16 may have a width of about 75 to about 250 mil. As set forth above, inembodiment 10 a, the pre-compression thickness of first and second portions is the same, typically about 55 mil (range 25-100 mil). The other embodiments may have similar or different dimensions. - It is seen that the
embodiment 10 a illustrated inFIGS. 4A-4D (or any other embodiment) may take, positionally, one of the three locations with respect to the pre-compression of the gasket adjacent the workpiece. InFIGS. 4B , it is seen thatimproved gasket 10 a may be dimensioned, for example, die cut or molded, such that the outer edge of thesecond portion 16 is vertically aligned with the outer edge of the workpiece, such as the outer edge of an aircraft antenna, attached to a base which may represent the fuselage of the aircraft. - In
FIG. 4B , the cut of the gasket with respect to the workpiece will be called straight or regular cut. However, in 4C it may be seen thatbody 12, typicallysecond portion 18 thereof and, optionally,skeleton 18/20 extends pre-compression slightly beyond the outer edge of the workpiece of the gasket. The gasket ofFIG. 4C may be termed “overcut.” Turning toFIG. 4D , an “undercut” gasket may be seen wherein the outer edge of theouter perimeter portion 16 andskeleton 18/20 does not reach, pre-compression, the outer edge of the workpiece. - The straight or regular cut gasket may be desired where there is only a slight bulge desired, post-compression, of the gasket at the workpiece perimeter. On the other hand, a slight overcut gasket may be provided to improve the aesthetics of the sealing adjacent the workpiece base and outer perimeter area see in
FIG. 4C . - In
FIGS. 4E and 4F , undercutgasket 10 a may be used for a number of reasons, including the ability to leave a slight gap post-compression for the insertion of a second material or asecond gasket 25, bead or an O-ring or the like in the gap G created between the workpiece and Base (outer edge) post-compression. -
FIGS. 4E and 4F illustrate the embodiment of Applicants' device using an undercutpre-cured gasket 10 a, which may be a gasket comprised of a pre-curedsticky gasket 10 g of either the single or dual firmness. It is undercut and even under compression may leave a small gap G, that is, a recess back from the outer edge of the workpiece. Applicants may provide a pre-cured, preformed elastomericsecond gasket 25.Second gasket 25 is configured to lay adjacent the outer perimeter ofpre-cured gasket 10 a. Workpiece is placed under slight compression and an elastic UVresistant gasket 25 is urged at least partially into gap G. Further compression may be applied to allow some of thebody 12 to be squeezed up to the inner boundaries of undercutgasket 10 a and also allow the outer edge ofsecond gasket 25 to protrude from gap G as seen inFIG. 4F . - In other applications, the undercut of
FIG. 4D may be limited to from several mil up to about 250 mil, in which case, under compression, the expansion of the second portion 15 may move it out slightly so it is flush with the outer edge of the workpiece. In still other embodiments, the undercut may remain under either partial or full compression and a flowable curable polyurethane or other suitable material may be applied at the gap at the undercut (see below). The applied material may itself provide a bead beyond the edge of the workpiece. -
FIGS. 6, 8, 10, 12, and 14 illustrate additional embodiments (two through six) 10 b, 10 c, 10 d, 10 e, and 10 f, respectively, of Applicants' improved gaskets, each illustrating differences in the shape ofsecond portion 16 may take as set forth in more detail below. - By varying the shapes of the outer edges, including the cross-sectional shapes, in some cases a more effective seal may be provided, as may be needed in different applications. Further, the post-compression visual aesthetics of the seal may be enhanced.
- It is noted that any of the embodiments 10 a-10 f may be straight cut, undercut or overcut as needed for effective sealing and/or aesthetic purposes. Moreover, it is seen that any of the embodiments may have a differential firmness wherein the softer
first portion 14 has a first or greater tackiness than theouter portion 16, which may be firmer and less tacky. -
FIG. 6 illustrates a cross-sectional shapedperimeter 24 b of the second flexible firmerouter portion 16 at the perimeter of thebody 12 ofembodiment 10 b.Cross-section 24 b is seen to be similar tocross-section 24 a ofembodiment 10 a (seeFIG. 4E ).Cross-section 24 a has three generally straight sides and acommon face 23 and a thickness approximately equal to thefirst portion 14.Cross-section 24 b ofembodiment 10 b (seeFIG. 6 ) is seen to have anupper lip 26 a and alower lip 26 b extending above and below thetop surface 14 a andbottom surface 14 b of thefirst portion 14.Lips 26 a/26 b may extend several mil (or typically up to about 20 mil) above the thickness offirst portion 14 defined as the distance betweentop surface 14 a andbottom surface 14 b thereof. Typically the overall thickness T of the regular sided rectangle seen incross-section 24 b is about 75 mil (range about 25 mil to 100 mil) or any other suitable thickness. -
FIG. 7 illustrates that a regular cut or slightly overcutembodiment 10 b of Applicants' improved gasket may provide a slightly contoured or bulging profile, seen in cross-section across the outer edge of the workpiece.Gasket 10 b is seen under compression between a workpiece which may be an aircraft antenna and a base which may be an aircraft fuselage. -
FIGS. 8 and 9 illustrate aperimeter cross-section 24 c that is seen to be plano-convex gasket 10 c. Here, as with the embodiments set forth in 10 a/10 b, there is acommon face 23 betweenfirmer perimeter portion 16 and less firmfirst portion 14. Here aconvex section 30 covers an arc typically greater than 90° and aplanar section 32 represents an extension ofbottom surface 14 b. Anadhesive strip 28, such as double sided tape, may be provided alongplanar section 32 on this embodiment or any other embodiment, which may provide for pre-compression placement and positioning of any of the improved gaskets against either the workpiece or the base prior to compression. -
FIG. 9 illustrates one configuration that the embodiment illustrated inFIG. 8 ,embodiment 10 c of Applicants' improved gasket, may take under compression between the workpiece and base. A rounded surface, in profile, may be seen extending slightly beyond the edge of the workpiece. - The increased thickness of the second portions, as illustrated in
embodiments 10 b-10 e, are believed to, in part, provide greater resistance to the migration of the soft material offirst portion 14 and the prevention of overrun outside the outer perimeter of Applicants' dual firmness or composite gasket. - In
FIG. 10 , illustratingembodiment 10 d, a ribbedtoothed surface 34 is provided as seen incross-section 24 d, as either an upper or a lower surface of the perimeter portion 16 (ribbed toothed upper surface shown). The toothed upper surface may help prevent creep or overrun of the material comprising thefirst portion 14 as it provides ridges that will flatten somewhat under compression. Moreover,improved gasket 10 d may include anupstanding wall portion 36 may be provided in the overcut area for both aesthetic and creep prevention. InFIG. 11 , it is seen how outerwalled portion 36 may be contoured to fit snugly adjacent the outer perimeter of the workpiece. The cross-sectional view seen inFIG. 10 may be termed a toothed-wall. - Turning to
FIGS. 12 and 13 , yet anotherembodiment 10 e of Applicants' improved gasket is illustrated.Embodiment 10 e may be seen to provide aperimeter portion 16 that is multi-concave incross-section 24 e, here having concave top and bottom walls and, optionally, a concave outer wall. This may provide for a slight concavity to the post-compression shape and sealing against the surface of the workpiece as illustrated inFIG. 13 . -
FIGS. 14 and 15 illustrate the use of double adhesive strip 26 on a top wall ofperimeter portion 16 and anotherembodiment 10 f with a shapedcross-section 24 f, here having a trapezoid (parallelogram) or quadrilateral shape with the face oppositecommon face 23 being slanted, typically outward from the top to bottom. While the thickness ofouter portion 16 is illustrated to be the same asinner portion 14,outer portion 16 may be thicker. As in other embodiments, theembodiment 10 f of Applicants' improved gasket may be either straight cut, undercut or slightly overcut. InFIG. 15 ,embodiment 10 f is illustrated under compression. -
FIGS. 16A thru 21B illustrate methods of preparing Applicants' various embodiments of their improved gasket. -
FIGS. 16A and 16B illustrate a cross-sectional view in which a two-piece mold ormulti-piece mold 50 is provided forembodiment 10 a, whereinmulti-piece mold 50 is defined by atop divider 52 and abottom divider 54, with agap 56 therebetween for the skeleton to protrude through. The two separate pieces are provided in a base 55 providing anupstanding bottom divider 54 and anoutside wall 57. A second piece may includetop divider 52, which along withbottom divider 54, will be typically very thin metal, which may be either solid or perforated to allow flow of the first material comprisingfirst portion 14 and a second material providing thesecond portion 16 thereof, so there may be intermingling during cure. - A cap 53, including
top divider 52, may be removed and, to start the procedure,skeleton 18/20 is placed across base 53 supported on the top edge ofbottom divider 54 and extending partway pastbottom divider 54 into space that will be filled with the second (firmer) composition. The first composition may then be poured pre-mixed in the snout S of the applicator A in known ways, and allowed to self-level to the desired height, hereH 14 andH 16 being equal. Following curing, cap 53 andtop divider 52 are removed leaving the cross-section illustrated inFIG. 15B . At this point, applicator A, this time having second material, a composition firmer than the composition of the first material, will be applied tolevel H 16. When this cures, thegasket 10 a can be carefully removed and is ready for use. -
FIGS. 17A and 17B illustrate similar procedures, which can be used whenH 16 is greater thanH 14, forembodiment 10 b. Here it will be seen thattop divider 52,bottom divider 54, andgap 56 add up to a height of aboutH 16. Here,perimeter 16 can be poured first, allowed to cure and, after removal oftop divider 16, thefirst portion 14 can be injected to a height of approximatelyH 14 leaving, when cured, a gasket substantially resemblingembodiment 10 b with across-section 24 b. -
FIGS. 18A and 18B illustrate a manner in which a two-piece base 55 havinglower portion 55 a andupper portion 55 b may be joined together to provide the curved section of embodiment 10C. Here,outer portion 16 may be injected first and theninner portion 14 may be injected to the desired height.Portion 55 b ofbase 55 may be removed for ease of removal of thegasket embodiment 10c having cross-section 24 c following curing of bothportions 14/16. -
FIGS. 19A and 19B also disclose the two-step method and two piece molds of the previous embodiment providing a first pouring or injecting of one of the first or second portions when the top divider and bottom divider are adjacent one another and a second pouring of the other or first or second portion following the removal of the top divider. Here, it is seen thatbase 55 is provided with a surface that is shaped to conform to the desired shape ofouter portion 16, here, see 24 d ofembodiment 10 d. -
FIGS. 20A, 20B, 21A, and 21B also illustrate a manner of configuring the mold, typically in two pieces, to conform to the desired end product having a specifically configuredfirst portion 14 and asecond portion 16 of a different, harder consistency. -
FIG. 20A illustrates top divider and bottom divider working together to provide a perimeter region in which a flowable, pre-cured mix can be injected to provide a proper or suitable shape to the firmer portion, while allowing some of the skeleton to extend into the perimeter portion. Once the perimeter portion has curedtop divider 52 may be removed and, as set forth inFIG. 20B , the less sticky or less firm pre-cured mix may be injected and allowed to cure. -
FIG. 21 illustrates a similar process, but the top divider is not needed to provide full coverage as the moldable material may self-level as indicated. - With reference to
FIGS. 22-27 , agasket 10 g is represented. This gasket may be any of the dual tackiness and/or firmness as set forth herein. However, with the disclosure that follows, it is pointed out that thegasket 10 g may be any of the gaskets of the prior art, but with features set herein, including exposed or non-exposed skeleton and undercut or straight cut features. Furthermore, abead 58 will be applied to the outer edge ofbody 12. The bead is not cured, and will cure in place after the (cured) gasket is between the workpiece and base. Moreover, the bead is typically forced into a gap G left b the body of the gasket not reaching the edge of the workpiece. Theskeleton 18/20 may or may not extend beyond the outer edge of the body. When it does, it will help bead 58 adhere to the gasket. -
FIG. 22 illustrates the preparation of agasket 10 g, wherein the gasket'sskeleton 18/20 extends beyond the outer edges ofbody 12. Furthermore, inFIG. 23 , Applicants illustrate thatgasket 10 g, which may be either of a single or dual tackiness as set forth above, may be undercut with respect to the workpiece. Typically, however, the bare edges ofskeleton 18/20 will go up to the edge of the workpiece as illustrated inFIG. 23 . - In
FIG. 24 , gasket 10 g is seen under sufficient compression such that some of thematerial comprising body 12 will ooze out to about the edge of the workpiece. -
FIG. 24A illustrates an embodiment of the undercut exposedskeleton gasket embodiment 10 g, which may be either single or dual tackiness, wherein under some or complete compression material ofbody 12 does not reach the outer edge of the workpiece. Here, as with the previous embodiment, there is exposed orbare skeleton 18/20 in gap G, but even under compression still leaves some of the skeleton exposed. - In
FIG. 24B , any of the early embodiments are illustrated in an undercut configuration (no exposed skeleton) when a gap G is left even after compression (either partial or complete) of the workpiece against the base. - Turning to
FIG. 25 , it is seen that the embodiment ofFIG. 24 , wherein undercompression body material 12 squeezes up to about the edge of the workpiece,bead 58 may be applied through snout S of an applicator applying a curable mix that will cure after application. The material used for the bead will typically be UV resistant and bond to thebody 12 of thegasket 10 g. One such curable mix from which bead may be made of a polysulfide which has suitable adhesion to a polyurethane body and which is somewhat UV resistant. -
FIG. 26 illustrates the use of a shaping tool ST prior to curing of the bead to shape and to remove excess bead material from the contact between the workpiece, the base, and the edge ofgasket 10 g. - Turning back to
FIGS. 25A and 25B , it is seen thatbead 58 may be applied to the gap G when an undercut gasket is provided that has an exposedskeleton 18/20 as inFIG. 25A . The term “undercut” here is used to describe an undercut of thebody material 12 where, even under compression, the body material leaves a gap between it and the edge of the workpiece. Such a gap is then filled after the workpiece and gasket are placed on the base (seeFIG. 25 ), with a suitable bead material to be cured with the workpiece in place. This bead material may be shaped as illustrated inFIG. 26 or otherwise formed into a suitable shape. InFIG. 25B , undercut refers to the gasket under compression, wherein neither the skeletal material nor the body reaches the edge of the workpiece. Here the gap is filled with the bead 58 (which may extend beyond the edge of the workpiece) as inFIGS. 25 and 25A , and may be shaped. -
FIG. 27 illustrates the final curedbead 58 adjacent to and sealed againstgasket 10 g, workpiece WP, and the base. The bead is typically firmer and/or less tacky thanbody 12. - All dimensions set forth herein are approximate and the ranges may be varied to suit specific applications.
- Although the invention has been described with reference to a specific embodiment, this description is not meant to be construed in a limiting sense. On the contrary, various modifications of the disclosed embodiments will become apparent to those skilled in the art upon reference to the description of the invention. It is therefore contemplated that the appended claims will cover such modifications, alternatives, and equivalents that fall within the true spirit and scope of the invention.
Claims (31)
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US17/445,678 Abandoned US20210385011A1 (en) | 2011-05-11 | 2021-08-23 | Gasket with a pliable resilient body with a perimeter having characteristics different than the body |
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US11378186B1 (en) * | 2018-05-15 | 2022-07-05 | The Patent Well LLC | Horizontally sectioned polymer gasket |
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WO2016011025A1 (en) | 2014-07-15 | 2016-01-21 | Aviation Devices & Electronic Components, L.L.C. | Polyurea perimeter seal for an aircraft antenna or other aircraft part |
US10052817B2 (en) * | 2014-07-15 | 2018-08-21 | The Patent Well LLC | Polyurea perimeter seal for an aircraft antenna or other aircraft part |
WO2016011395A1 (en) * | 2014-07-18 | 2016-01-21 | Aviation Devices & Electronic Components, L.L.C. | Elastomeric gasket having a foam metal skeletal member |
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-
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2014
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2017
- 2017-07-11 US US15/646,888 patent/US20170305523A1/en not_active Abandoned
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2018
- 2018-04-25 US US15/962,021 patent/US11128397B2/en active Active
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2021
- 2021-08-23 US US17/445,678 patent/US20210385011A1/en not_active Abandoned
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US11378186B1 (en) * | 2018-05-15 | 2022-07-05 | The Patent Well LLC | Horizontally sectioned polymer gasket |
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US10230494B2 (en) | 2019-03-12 |
US11128397B2 (en) | 2021-09-21 |
US20140326830A1 (en) | 2014-11-06 |
US20180241505A1 (en) | 2018-08-23 |
US20140167367A1 (en) | 2014-06-19 |
US9701388B2 (en) | 2017-07-11 |
WO2019015483A1 (en) | 2019-01-24 |
US20210385011A1 (en) | 2021-12-09 |
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