US20010052438A1 - Protection plug - Google Patents
Protection plug Download PDFInfo
- Publication number
- US20010052438A1 US20010052438A1 US09/302,835 US30283599A US2001052438A1 US 20010052438 A1 US20010052438 A1 US 20010052438A1 US 30283599 A US30283599 A US 30283599A US 2001052438 A1 US2001052438 A1 US 2001052438A1
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- Prior art keywords
- bore
- plug
- washers
- component
- exterior
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
- F16N—LUBRICATING
- F16N21/00—Conduits; Junctions; Fittings for lubrication apertures
- F16N21/06—Covering members for nipples, conduits or apertures
Definitions
- This invention relates to devices for protecting internal areas of large cast or machined components, namely the internal threads.
- these components are temporarily stored outdoors and stacked on top of each other. If there are any protrusions that extend beyond the surfaces on which the components rest, the protrusions are broken or sheared off during the stacking process, allowing water that often contains corrosive agents, to seep in and destroy the threads.
- the present invention meets needs existing in the prior art.
- the thread protection plug of the present invention is designed to seal the threads of the components from weather and environmental conditions.
- the thread protection plug is also positionable within the components so that it is flush with the stacking surface.
- the invention herein comprises a body insertable within a recessed area of a component, body having an exterior, a first end and a second end.
- the first bore extends between the first end and the exterior of the body below the first end.
- the invention further comprises at least one lubrication fitting, preferably self-sealing, fluidly connected to the first bore to allow fluid flow from the first end to a point exterior of the body.
- the invention comprises the plug alone and in combination with a threaded component.
- the invention also comprises a method for protecting a recessed area of a component using a plug, comprising the steps of (a) inserting the plug into the recessed area of the component, and, (b) pumping a protective material through the lubrication fitting to a point exterior of the body.
- An alternate embodiment of the invention comprises the combination of a component having a bore extending therethrough and plug for protecting said bore.
- the plug comprises (a) a pair of washers positionable at opposite ends of the bore having a recessed end positionable over or at least partially within said bore; (b) a joining member engageable with the pair of washers that positions the washers over the bore; (c) a lubrication fitting positioned on at least one of the washers to allow a protective material to be inserted into said bore when the washers have been positioned over the bore.
- the invention comprises an alternate method for protecting a bore configured within a component using the plug invention described in the previous paragraph.
- the alternate method comprises the following steps: (a) positioning washers over the opposite ends of the bore; (b) operating said the joining member so that the washers are positioned over the bore; and, (c) pumping a protective material through the lubrication fitting.
- FIG. 1 is a top view of the plug invention.
- FIG. 1 a is a top view of an alternate embodiment of the invention without secondary engagement surfaces.
- FIG. 1 b is a top view of an alternate embodiment of the invention.
- FIG. 2 is a side view of an embodiment of the plug invention.
- FIG. 2 a is a side view of an alternate embodiment of the plug invention.
- FIG. 3 is a cross-sectional view of an embodiment of the plug invention shown in FIG. 2 installed in a component taken along section line 3 - 3 in FIG. 1.
- FIG. 3 a is a similar cross-sectional view of an embodiment of the plug invention shown in FIG. 2 a installed in a component.
- FIGS. 4 and 5 are cross-sectional views of an alternate embodiment of the invention used for components having bores extending completely therethrough.
- FIG. 6 is a sectional view of an alternate embodiment of the invention.
- FIG. 7 is a top view of the embodiment shown in FIG. 6.
- plug 10 has a substantially cylindrical body 12 with external threads 14 , although body 12 need not be configured with external threads in embodiments comprising press-fitting type bodies.
- Body 12 and external threads 14 are configured to be insertable into a recessed area of a component 30 and to mate with an opposing internal surface, such as internal threads 36 .
- recessed area shall include, but is not limited to, areas below surface 46 in need of protection, such as the areas filled by plug 10 and the cavity 34 remaining below plug 10 shown in FIGS. 3 and 3 a .
- Recessed areas also include areas extending through a component 30 such as bore 50 shown in FIGS. 4 and 5.
- Body 12 has a first end 16 and a second end 18 , both of which are preferably substantially planar. Body 12 also has an exterior 59 , which comprises all outer surfaces of plug 10 . Referring to FIG. 2, a lip 44 may extend slightly out from the edge of first end 16 to aid in the protection of the internal surface of component 30 . Lip 44 may comprise a single thread as shown in FIG. 2 to allow plug 10 to remain substantially flush with surface 46 while protecting the recessed area of a component 30 .
- plug 10 may be configured with a head 48 when it is not necessary that end 16 be substantially flush with surface 46 , providing a larger lip 70 extending out from the edge of first end 16 as shown in FIG. 2 a .
- Plug 10 may be constructed from a wide variety of materials, such as metal or plastic.
- Head 48 may take various shapes, such as round (as shown) or hexagonal.
- a first bore 40 extends between ends 16 , 18 , and may comprise recess 24 and lower bore 22 .
- Recess 24 is preferably configured to have a substantially planar bottom surface 42 .
- the upper wall 58 of first bore 40 (or recess 24 ) near first end 16 may be circular in shape, but it is preferred that the upper portion be polygonal in shape, as shown in Figure 1 a , so that first bore 40 (or recess 24 ) is engageable by a polygonal wrench.
- a lubrication fitting 20 preferably a Zerk-type fitting as manufactured by Alemite Corporation, is positioned within the recess 24 and fluidly connects recess 24 to lower bore 22 formed through body 12 to allow fluid flow through first bore 40 from first end 16 to a point exterior of body 12 , preferably near second end 18 .
- Fitting 20 prevents back-flow along that same path.
- Protective material such as grease, enters fitting 20 and passes through body 12 , out through lower bore 22 .
- Both recess 24 and fitting 20 are preferably constructed so that no portion of fitting 20 extends beyond first end 16 .
- a second bore 26 may be positioned within body 12 between first end 16 and the exterior of body 12 below first end 16 to allow grease to pass back through body 12 after the cavity area 34 between second end 18 and the bottom of the recessed area of the component 30 has been filled with grease.
- “at an exterior point below first end” means any point along the exterior 59 of plug other than top surface 63 . This allows the user of plug 10 to know when cavity area 34 has been completely filled with grease.
- Second bore 26 may extend from first end 16 as shown in FIG. 3 a or may extend from the bottom of engagement hole 32 as shown in FIG. 3. Second bore 26 may exit at second end 18 or at some other point exterior of body 12 , such as a point within the area of external threads 14 .
- Engagement surfaces 28 may be formed within first end 16 . As shown in FIGS. 1 and 3, engagement surfaces 28 comprise engagement holes 32 . Engagement holes 32 are sized and spaced apart sufficiently to allow engagement by the prongs of a spanner wrench as shown in the attached drawing. Engagement holes 32 may be configured in other ways to allow for engagement by other tools, such as the polygonal recess 24 , shown in FIG. 1 a , where upper wall 58 serves as an engagement surface 28 . As shown in FIG. 1 b , engagement surface 28 may comprise a slot 64 traversing at least a portion of top surface 63 to allow engagement by a tool. The bottom of slot 64 may terminate above the upper end of fitting 20 so that when a tool engages slot 64 , the tool will not damage fitting 20 .
- plug 10 is inserted into the recessed area 38 of the component 30 .
- plug 10 is simply screwed into recessed area 38 until first end 16 has become at least substantially flush with the surface 46 of component 30 .
- engagement surface 28 may be located on head 48 or along upper wall 58 as previously described.
- a grease gun is then attached to lubrication fitting 20 , and grease is pumped through lubrication fitting 20 , into cavity area 34 and any voids that may exist between opposing threads 14 , 36 .
- Grease is pumped through lubrication fitting 20 until grease flows between opposing threads 14 , 36 to surface 46 or flows through second bore 26 and becomes visible to the operator.
- a water-resistant or water-proof grease is used.
- FIG. 4 An alternate embodiment of the invention is shown in FIG. 4 for use with a component 30 having a bore 50 extending completely therethrough.
- Plug 10 comprises a top washer 51 and a bottom washer 52 positionable over or at least partially within bore 50 .
- Each washer 51 , 52 has a first end 53 , preferably flanged as shown, that allow the recessed ends 57 of washers 51 , 52 to rest substantially within bore 50 .
- Each washer 51 , 52 is configured with an aperture 56 therein to allow a bolt 54 to pass therethrough.
- Washers 51 , 52 are mounted to the components by positioning them at opposite ends of bore 50 , inserting bolt 54 through the washer apertures 56 , and securing a nut 55 to bolt 54 until washers 51 , 52 are positioned over bore 50 , preferably securely positioned.
- Either washer 51 , 52 or bolt 54 may be configured with a lubrication fitting 20 or second bore 26 so that plug 10 operates as previously described.
- “joining member” describes nut 55 and bolt 54 , or any other device or apparatus known in the art, used to releasably join or connect two washers 51 , 52 .
- a threaded bolt 60 or other suitable member is fixedly positioned longitudinally within and included as part of body 12 .
- Lubrication fitting 20 is attached to bolt head 62 and is fluidly connected to lower bore 22 , which extends through bolt 60 to second end 18 or a point exterior of body 12 below first end 16 .
- Bolt 60 may be fixed in a position within body 12 by welds 61 or other suitable means.
- Bolt head 62 and lubrication fitting 20 are preferably contained within recess 24 .
- Engagement surface 28 may be provided on bolt head 62 and may take the form of a standard hex head or any other regular polygonal shape, as shown in FIG. 7. Alternatively, as previously described, upper wall 58 may form an engagement surface 28 . Sufficient area should be provided around bolt head 62 for insertion of a socket wrench or similar tool to operate plug 10 .
Abstract
A plug for protecting the interior of a recessed area of a component during storage is disclosed herein. The plug includes a lubrication fitting positioned thereon to flow a protective material, such as grease, into the cavity between the lower end of the plug and the recessed area and any remaining voids between the walls of the plug and the walls of the recessed area. The plug may also include an engagement surface to assist in the insertion and removal of the plug into and out of recessed areas of a component.
Description
- 1. Field of the Invention
- This invention relates to devices for protecting internal areas of large cast or machined components, namely the internal threads.
- 2. Prior Art
- Large castings and machined components having internal threads are often placed outdoors for temporary storage. Accordingly, these components are subject to moisture and other damaging weather and environmental conditions. While many parts of the components do not suffer significant damage, the threads which are machined into metal surfaces often must be re-machined after the components have been exposed to the elements and damaged. Re-machining of threads significantly increases the turnaround time and is expensive, particularly in the case of leased equipment.
- In some instances, these components are temporarily stored outdoors and stacked on top of each other. If there are any protrusions that extend beyond the surfaces on which the components rest, the protrusions are broken or sheared off during the stacking process, allowing water that often contains corrosive agents, to seep in and destroy the threads. Thus, a long-standing need exists for a device that protects threads in components from the destructive effects of weather and harsh operating conditions and that does not have any protrusions extending beyond the stacking surface.
- Stationary surfaces, such as the decks of ships, also have threaded recessed areas configured therein that may be exposed to saltwater and the elements. The threads must be protected from the elements and effects of saltwater and must be flush with the deck surface so as not to produce a trip hazard. In the event of an emergency, these thread protection devices may have to be removed very quickly and with minimum effort. The very safety of the ship could depend on it. Therefore, it is imperative that the threads be protected from even the slightest hint of corrosion of any kind.
- The present invention meets needs existing in the prior art. The thread protection plug of the present invention is designed to seal the threads of the components from weather and environmental conditions. The thread protection plug is also positionable within the components so that it is flush with the stacking surface.
- With the aforementioned considerations in mind, it is therefore an object of this invention to provide a thread protection plug that prevents damage to threaded components caused by exposure to weather and environmental conditions.
- It is a further object of this invention to provide a thread protection plug that allows the component threads to be lubricated and protected without removal of the plug.
- It is a further object of this invention to provide a thread protection plug that can quickly and efficiently insert into a variety of cast and machined components.
- These and other advantages and objects of this invention shall become apparent from the ensuing description of the invention.
- The invention herein comprises a body insertable within a recessed area of a component, body having an exterior, a first end and a second end. The first bore extends between the first end and the exterior of the body below the first end. The invention further comprises at least one lubrication fitting, preferably self-sealing, fluidly connected to the first bore to allow fluid flow from the first end to a point exterior of the body. The invention comprises the plug alone and in combination with a threaded component.
- The invention also comprises a method for protecting a recessed area of a component using a plug, comprising the steps of (a) inserting the plug into the recessed area of the component, and, (b) pumping a protective material through the lubrication fitting to a point exterior of the body.
- An alternate embodiment of the invention comprises the combination of a component having a bore extending therethrough and plug for protecting said bore. The plug comprises (a) a pair of washers positionable at opposite ends of the bore having a recessed end positionable over or at least partially within said bore; (b) a joining member engageable with the pair of washers that positions the washers over the bore; (c) a lubrication fitting positioned on at least one of the washers to allow a protective material to be inserted into said bore when the washers have been positioned over the bore.
- The invention comprises an alternate method for protecting a bore configured within a component using the plug invention described in the previous paragraph. The alternate method comprises the following steps: (a) positioning washers over the opposite ends of the bore; (b) operating said the joining member so that the washers are positioned over the bore; and, (c) pumping a protective material through the lubrication fitting.
- FIG. 1 is a top view of the plug invention.
- FIG. 1a is a top view of an alternate embodiment of the invention without secondary engagement surfaces.
- FIG. 1b is a top view of an alternate embodiment of the invention.
- FIG. 2 is a side view of an embodiment of the plug invention.
- FIG. 2a is a side view of an alternate embodiment of the plug invention.
- FIG. 3 is a cross-sectional view of an embodiment of the plug invention shown in FIG. 2 installed in a component taken along section line3-3 in FIG. 1.
- FIG. 3a is a similar cross-sectional view of an embodiment of the plug invention shown in FIG. 2a installed in a component.
- FIGS. 4 and 5 are cross-sectional views of an alternate embodiment of the invention used for components having bores extending completely therethrough.
- FIG. 6 is a sectional view of an alternate embodiment of the invention.
- FIG. 7 is a top view of the embodiment shown in FIG. 6.
- Illustrations of construction, design, and methods of operation of the invention are set forth below with specific references to the Figures. However, it is not the intention of the inventor that the scope of his invention be limited to these embodiments.
- As shown in FIGS. 1, 1a, 1 b, 2, and 2 a,
plug 10 has a substantiallycylindrical body 12 withexternal threads 14, althoughbody 12 need not be configured with external threads in embodiments comprising press-fitting type bodies.Body 12 andexternal threads 14 are configured to be insertable into a recessed area of acomponent 30 and to mate with an opposing internal surface, such asinternal threads 36. As used herein, recessed area shall include, but is not limited to, areas belowsurface 46 in need of protection, such as the areas filled byplug 10 and thecavity 34 remaining belowplug 10 shown in FIGS. 3 and 3a. Recessed areas also include areas extending through acomponent 30 such asbore 50 shown in FIGS. 4 and 5. -
Body 12 has afirst end 16 and asecond end 18, both of which are preferably substantially planar.Body 12 also has anexterior 59, which comprises all outer surfaces ofplug 10. Referring to FIG. 2, alip 44 may extend slightly out from the edge offirst end 16 to aid in the protection of the internal surface ofcomponent 30.Lip 44 may comprise a single thread as shown in FIG. 2 to allowplug 10 to remain substantially flush withsurface 46 while protecting the recessed area of acomponent 30. - In the embodiment shown in FIG. 2a,
plug 10 may be configured with ahead 48 when it is not necessary thatend 16 be substantially flush withsurface 46, providing alarger lip 70 extending out from the edge offirst end 16 as shown in FIG. 2a.Plug 10 may be constructed from a wide variety of materials, such as metal or plastic.Head 48 may take various shapes, such as round (as shown) or hexagonal. - As shown in FIG. 3, a first bore40 extends between ends 16, 18, and may comprise recess 24 and lower bore 22. Recess 24 is preferably configured to have a substantially planar
bottom surface 42. As shown in FIG. 1, theupper wall 58 of first bore 40 (or recess 24) nearfirst end 16 may be circular in shape, but it is preferred that the upper portion be polygonal in shape, as shown in Figure 1a, so that first bore 40 (or recess 24) is engageable by a polygonal wrench. - Referring back to FIG. 3, a
lubrication fitting 20, preferably a Zerk-type fitting as manufactured by Alemite Corporation, is positioned within the recess 24 and fluidly connects recess 24 to lower bore 22 formed throughbody 12 to allow fluid flow through first bore 40 fromfirst end 16 to a point exterior ofbody 12, preferably nearsecond end 18. Fitting 20 prevents back-flow along that same path. Protective material, such as grease, enters fitting 20 and passes throughbody 12, out through lower bore 22. Both recess 24 and fitting 20 are preferably constructed so that no portion of fitting 20 extends beyondfirst end 16. - As shown in FIGS. 1, 1a and 3, a
second bore 26 may be positioned withinbody 12 betweenfirst end 16 and the exterior ofbody 12 belowfirst end 16 to allow grease to pass back throughbody 12 after thecavity area 34 betweensecond end 18 and the bottom of the recessed area of thecomponent 30 has been filled with grease. As used herein “at an exterior point below first end” means any point along theexterior 59 of plug other thantop surface 63. This allows the user ofplug 10 to know whencavity area 34 has been completely filled with grease. Second bore 26 may extend fromfirst end 16 as shown in FIG. 3a or may extend from the bottom of engagement hole 32 as shown in FIG. 3. Second bore 26 may exit atsecond end 18 or at some other point exterior ofbody 12, such as a point within the area ofexternal threads 14. - Engagement surfaces28 may be formed within
first end 16. As shown in FIGS. 1 and 3, engagement surfaces 28 comprise engagement holes 32. Engagement holes 32 are sized and spaced apart sufficiently to allow engagement by the prongs of a spanner wrench as shown in the attached drawing. Engagement holes 32 may be configured in other ways to allow for engagement by other tools, such as the polygonal recess 24, shown in FIG. 1a, whereupper wall 58 serves as anengagement surface 28. As shown in FIG. 1b,engagement surface 28 may comprise a slot 64 traversing at least a portion oftop surface 63 to allow engagement by a tool. The bottom of slot 64 may terminate above the upper end of fitting 20 so that when a tool engages slot 64, the tool will not damage fitting 20. - In operation, plug10 is inserted into the recessed
area 38 of thecomponent 30. Whencomponent 30 has a threaded recessed area, plug 10 is simply screwed into recessedarea 38 untilfirst end 16 has become at least substantially flush with thesurface 46 ofcomponent 30. When it is not necessary thatupper end 16 ofplug 10 be substantially flush withsurface 46, the embodiment shown in FIGS. 2a and 3 a may be used, andengagement surface 28 may be located onhead 48 or alongupper wall 58 as previously described. A grease gun is then attached to lubrication fitting 20, and grease is pumped through lubrication fitting 20, intocavity area 34 and any voids that may exist between opposingthreads threads second bore 26 and becomes visible to the operator. Preferably, a water-resistant or water-proof grease is used. - An alternate embodiment of the invention is shown in FIG. 4 for use with a
component 30 having abore 50 extending completely therethrough.Plug 10 comprises atop washer 51 and abottom washer 52 positionable over or at least partially withinbore 50. Eachwasher first end 53, preferably flanged as shown, that allow the recessed ends 57 ofwashers bore 50. Eachwasher aperture 56 therein to allow abolt 54 to pass therethrough.Washers bore 50, insertingbolt 54 through thewasher apertures 56, and securing anut 55 to bolt 54 untilwashers bore 50, preferably securely positioned. Eitherwasher bolt 54 may be configured with a lubrication fitting 20 orsecond bore 26 so thatplug 10 operates as previously described. As used in the claims, “joining member” describesnut 55 andbolt 54, or any other device or apparatus known in the art, used to releasably join or connect twowashers - Another alternate embodiment of the
invention 10 is shown in FIGS. 6 and 7. In this embodiment, a threadedbolt 60 or other suitable member is fixedly positioned longitudinally within and included as part ofbody 12. Lubrication fitting 20 is attached to bolthead 62 and is fluidly connected to lower bore 22, which extends throughbolt 60 tosecond end 18 or a point exterior ofbody 12 belowfirst end 16.Bolt 60 may be fixed in a position withinbody 12 bywelds 61 or other suitable means.Bolt head 62 and lubrication fitting 20 are preferably contained within recess 24.Engagement surface 28 may be provided onbolt head 62 and may take the form of a standard hex head or any other regular polygonal shape, as shown in FIG. 7. Alternatively, as previously described,upper wall 58 may form anengagement surface 28. Sufficient area should be provided aroundbolt head 62 for insertion of a socket wrench or similar tool to operateplug 10. - Although the preferred embodiment has been described, it will be appreciated by those skilled in the art to which the present invention pertains that modifications, changes, and improvements may be made without departing from the spirit of the invention defined by the claims.
Claims (19)
1. A protection plug comprising:
(a) a body insertable within a recessed area of a component, said body having an exterior, a first end and a second end;
(b) a first bore extending between said first end and said exterior of said body below said first end;
(c) a lubrication fitting fluidly connected to said first bore, said lubrication fitting allowing fluid flow from said first end to a point exterior of said body.
2. The plug according to wherein said lubrication fitting does not extend beyond said first end.
claim 1
3. The plug according to further comprising a second bore extending between said first end and the exterior of said body below said first end.
claim 2
4. The plug according to further comprising one or more engagement surfaces positioned near said first end.
claim 3
5. The plug according to wherein said engagement surface comprises a polygonal upper wall of said first bore.
claim 4
6. The plug according to wherein said body further comprises a lip positioned at said first end.
claim 4
7. The plug according to wherein said engagement surface comprises one or more engagement holes in said first end.
claim 4
8. The plug according to wherein said second bore extends between said exterior of said body below said first end and at least one of the engagement holes.
claim 7
9. The plug according to wherein said body has a threaded exterior extending between said ends.
claim 1
10. In combination with a component having a recessed area, a plug for protecting said recessed area, said plug comprising:
(a) a body insertable within a recessed area of a component, said body having an exterior, a first end and a second end;
(b) a first bore extending between said first end and said exterior of said body below said first end;
(c) a lubrication fitting positioned within said first bore, said lubrication fitting allowing fluid flow from said first end to a point exterior of said body.
11. A method for protecting a recessed area of a component using a plug, said component having a surface, said plug comprising a body insertable within said recessed area, said body having an exterior, a first end, and a second end; a first bore extending between said first end and the exterior of said body below said first end; a lubrication fitting fluidly connected to said first bore, said lubrication fitting allowing fluid flow from said first end to a point exterior of said body, said method comprising the steps of:
(a) inserting said plug into said recessed area of said component; and,
(b) pumping a protective material through said lubrication fitting.
12. The method according to comprising the step of inserting said plug into said recessed area of said component until said first end is at least substantially flush with said surface of said component.
claim 11
13. The method according to , wherein said plug further comprises a second bore extending between said first end and said second end, said method further comprising the step of pumping a protective material through said lubrication fitting until protective material flows through said second bore and reaches said first end.
claim 11
14. The method according to , further comprising the step of pumping a protective material through said lubrication fitting until said protective material flows between said component and said plug and reaches said first end.
claim 11
15. In combination with a component having a bore extending therethrough, a plug for protecting said bore, said plug comprising:
(a) a pair of washers positionable at opposite ends of said bore, said washers having a first end and a recessed end positionable within said bore;
(b) a joining member engageable with said pair of washers, said joining member positioning said washers over said bore when said washers are positioned at opposite ends of said bore;
(c) a lubrication fitting positioned on at least one of said washers to allow a protective material to be inserted into said bore when said washers have been positioned over said bore.
16. The combination according to further comprising a second bore positioned in at least one of said washers.
claim 15
17. The combination according to wherein said joining member is configured such that the ends of said joining member are at least flush with said first ends of said washers.
claim 16
18. A method for protecting a bore configured within a component using a plug comprising a pair of washers positionable at opposite ends of said bore, said washers having a first end and a recessed end positionable within said bore; a joining member engageable with said pair of washers, said joining member securing said washers over said bore when said washers are positioned at opposite ends of said bore, and, a lubrication fitting positioned at least one of said washers to allow a protective material to be inserted into said bore when said washers have been positioned over said bore, said method comprising the steps of:
(a) positioning said washers over the opposite ends of said bore;
(b) operating said joining member so that said washers are positioned over said bore; and,
(c) pumping a protective material through said lubrication fitting.
19. The plug according to wherein said engagement surface comprises a slot traversing at least a portion of a top surface of said body.
claim 4
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/302,835 US6349794B2 (en) | 1999-04-30 | 1999-04-30 | Protection plug |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US09/302,835 US6349794B2 (en) | 1999-04-30 | 1999-04-30 | Protection plug |
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US20010052438A1 true US20010052438A1 (en) | 2001-12-20 |
US6349794B2 US6349794B2 (en) | 2002-02-26 |
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US09/302,835 Expired - Fee Related US6349794B2 (en) | 1999-04-30 | 1999-04-30 | Protection plug |
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