CA1176582A - Protective end cap for external pipe threads - Google Patents
Protective end cap for external pipe threadsInfo
- Publication number
- CA1176582A CA1176582A CA000396536A CA396536A CA1176582A CA 1176582 A CA1176582 A CA 1176582A CA 000396536 A CA000396536 A CA 000396536A CA 396536 A CA396536 A CA 396536A CA 1176582 A CA1176582 A CA 1176582A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- core
- sleeve
- end cap
- cap
- Prior art date
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D59/00—Plugs, sleeves, caps, or like rigid or semi-rigid elements for protecting parts of articles or for bundling articles, e.g. protectors for screw-threads, end caps for tubes or for bundling rod-shaped articles
- B65D59/06—Caps
-
- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/005—Protection of pipes or objects of similar shape against external or internal damage or wear specially adapted for the ends of pipes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Buffer Packaging (AREA)
Abstract
A PROTECTIVE END CAP FOR EXTERNAL PIPE THREADS
Abstract of the Disclosure An external pipe thread protective end cap is provided comprising an outer sleeve and an inner tubular plastic core locked thereto. The core has threads on its inner periphery threadingly engageable with the pipe threads when the protective end cap is screwed thereon.
The sleeve and core have mating curved outer end portions which overlap and engage the end surface of the pipe when the protective end cap is threaded onto the pipe. The curved outer end portion of the core preferably has a metal insert associated therewith, and a closure member with tear-away flaps.
Abstract of the Disclosure An external pipe thread protective end cap is provided comprising an outer sleeve and an inner tubular plastic core locked thereto. The core has threads on its inner periphery threadingly engageable with the pipe threads when the protective end cap is screwed thereon.
The sleeve and core have mating curved outer end portions which overlap and engage the end surface of the pipe when the protective end cap is threaded onto the pipe. The curved outer end portion of the core preferably has a metal insert associated therewith, and a closure member with tear-away flaps.
Description
A PROTECTIVE END CAP FOR EXTERNAL PIP~ THREADS
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates generally to thread protectors, and more specifically to a protective end cap for protecting external pipe threads at the end of a pipe, tubing, casing or the like.
Description of the Prior Art U.S. Patent No. ~,079,756 issued ~arch 21, 1978 1~ to Kenneth A. Smiley discloses a plastic protective end cap having a radially inwardly curved end portion over-lapping the end surface of the threaded end of a pipe.
Although the plastic curved end portion offers some protection to the threaded end of the pipe from light, 15 axially directed impact forces, damage to the threaded end may occur if such forces are large. Such damage may necessitate retapping the damaged threads, or cutting off the damaged pipe end and rethreading it.
It is further known to provide metal end caps 20 having inner peripheral threads for threadingly engaging external pipe threads. Axially directed impact forces on such metal end caps can cause thread damage, resulting in locking or cross--threading of the external pipe threads which may prevent rernoval of the end cap. Such damage may 25 necessitate retapping the damaged threads, or cutting off the end cap and rethreading the pipe end.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a protective end cap for protecting external 30 threads on the end portion of a pipe or the like.
To this end the invention consists of a protective end cap for protecting the external threaded portion and end portion oE a pipe comprising: a metal sleeve having a first radially inwardly curved end portion substantially .~
overlapping the end of said pipe; a substantially rigid metal insert disposed between said inwardly curved end portion of said sleeve and said end of said pipe; and a resilient plastic core having a first portion disposed between said sleeve and the threaded portion of said pipe and a second impact aDsorbing inwardly curved end portion disposed bet~een said metal insert and said inwardly curved end portion of said sleeve.
One advantage of this invention is to provide end caps for protecting external threads at the end of a pipe or the like that are of simple design and construction, and easy to manu~acture. This is achieved by using common sleeves of one design into which inner cores of varying internal thread design are inserted and locked. The internal thread designs correspond to the varied shapes of the external threaded pipe end portions presently available on the market.
Another advantage of this invention is to provide an end cap formed from a core and sleeve having unique curved mating front end portions overlapping and in engage-ment with the end surface of a pipe when the end cap i9 mounted thereon. The curved front end portions of the end cap, preferably when reinforced by a metal insert, protect the externally threaded pipe end portion from damage due to forces directed against the front end portion. Damaged pipe end portions may necessitate costly repair operations such as retapping the external threads, or cutting off the damaged pipe end portion and rethreading the pipe end.
The invention and its advantages will become more apparent from the detailed description of embodiments thereof presented below.
BRIEF DESCRIPTION OF THE DRAWING
In the detailed description of embodiments of the invention presented below, reference is made to the accompanying drawing, in which:
FigO 1 is a segmental perspective view of a preferred embodiment of a protective end cap mounted on external threads at the end of a pipe;
Fig. 2 is a segmental enlarged section view taken substantially along line 2-2 of Fig. 1;
Fig. 3 is a segmental section view similar to Fig.
BACKGROUND OF THE INVENTION
Field of the Invention This invention relates generally to thread protectors, and more specifically to a protective end cap for protecting external pipe threads at the end of a pipe, tubing, casing or the like.
Description of the Prior Art U.S. Patent No. ~,079,756 issued ~arch 21, 1978 1~ to Kenneth A. Smiley discloses a plastic protective end cap having a radially inwardly curved end portion over-lapping the end surface of the threaded end of a pipe.
Although the plastic curved end portion offers some protection to the threaded end of the pipe from light, 15 axially directed impact forces, damage to the threaded end may occur if such forces are large. Such damage may necessitate retapping the damaged threads, or cutting off the damaged pipe end and rethreading it.
It is further known to provide metal end caps 20 having inner peripheral threads for threadingly engaging external pipe threads. Axially directed impact forces on such metal end caps can cause thread damage, resulting in locking or cross--threading of the external pipe threads which may prevent rernoval of the end cap. Such damage may 25 necessitate retapping the damaged threads, or cutting off the end cap and rethreading the pipe end.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a protective end cap for protecting external 30 threads on the end portion of a pipe or the like.
To this end the invention consists of a protective end cap for protecting the external threaded portion and end portion oE a pipe comprising: a metal sleeve having a first radially inwardly curved end portion substantially .~
overlapping the end of said pipe; a substantially rigid metal insert disposed between said inwardly curved end portion of said sleeve and said end of said pipe; and a resilient plastic core having a first portion disposed between said sleeve and the threaded portion of said pipe and a second impact aDsorbing inwardly curved end portion disposed bet~een said metal insert and said inwardly curved end portion of said sleeve.
One advantage of this invention is to provide end caps for protecting external threads at the end of a pipe or the like that are of simple design and construction, and easy to manu~acture. This is achieved by using common sleeves of one design into which inner cores of varying internal thread design are inserted and locked. The internal thread designs correspond to the varied shapes of the external threaded pipe end portions presently available on the market.
Another advantage of this invention is to provide an end cap formed from a core and sleeve having unique curved mating front end portions overlapping and in engage-ment with the end surface of a pipe when the end cap i9 mounted thereon. The curved front end portions of the end cap, preferably when reinforced by a metal insert, protect the externally threaded pipe end portion from damage due to forces directed against the front end portion. Damaged pipe end portions may necessitate costly repair operations such as retapping the external threads, or cutting off the damaged pipe end portion and rethreading the pipe end.
The invention and its advantages will become more apparent from the detailed description of embodiments thereof presented below.
BRIEF DESCRIPTION OF THE DRAWING
In the detailed description of embodiments of the invention presented below, reference is made to the accompanying drawing, in which:
FigO 1 is a segmental perspective view of a preferred embodiment of a protective end cap mounted on external threads at the end of a pipe;
Fig. 2 is a segmental enlarged section view taken substantially along line 2-2 of Fig. 1;
Fig. 3 is a segmental section view similar to Fig.
2 of another embodiment of the protective end cap mountable on external threads of a different type;
Fig. 4 is a view similar to Figs. 1 and 2 of a slightly modified protective end cap mounted on external threads of still another type;
Fig. 5 is a segmented view in section of another embodiment of the protective end cap of this invention;
Fig. 6 is a segmental view similar to Fig. 5 of still another embodiment of the protective end cap of this invention;
Fig. 7 is a segmental section view of a protective end cap showing a different way of securing the inner core to the outer sleeve;
Fig. 8 is a segmental end view of the end cap of Fig. 7; and Fig. 9 is a segmental section view of an end cap showing a splined connection between the inner core and outer sleeve~
DET~ILED DESCRIPTION OF EMBODIMENTS OF T~IE INVENTION
With reference to Figs. 1 and 2, a preferred embodiment of a protective end cap 10 is disclosed for protecting external Butress type threads 12 on the end portion of any suitable pipe, conduit, casing or the like designated 14. End cap 10 is formed from two interlocking parts, an outer sleeve 16 and an inner core 1~.
Outer sleeve 16 is preferably made from any suitable rigid material such as steel. Sleeve 1~ is preerably of a cylindrical configuration throughout most of its length. The sleeve further has a radially inwardly curved outer end portion 20 overlapping the end surface 22 of pipe 14 when the end cap is mounted on the end of a pipe.
Inner core 18 i6 preferably made of any suitable high-impact plastic. ~ore 18 has an inner threaded tapered surface 24 for threadingly engaging tapered external threads 12 on pipe 14 when end cap 10 is screwed onto the end of the pipe. The interengaging threads 12, 24 hold the end cap on the pipe and provide a seal so that moisture does not contact the pipe threads. Core 18 further has an outer peripheral surface 26 and curved outer end portion 28 conforming to a portion of the inner peripheral surface 30 of sleeve 16. End portion 28 further has a radially inwardly extending section 27 interposed between sleeve end portion 20 and pipe end surface 22 of a width or thickness approximately 0.10 cm (0.04 inch). Core 18 also has a left or inner end rim 29 of greater diameter than sleeve end 33 to protect the sleeve end from damage from external forces or blows, and to prevent the sleeve end from damaging expose~ pipe threads on other pipes during handling. End rim 29 has a tapered edge 31 for deflecting blows directed against the rim.
Sleeve 16 and core 18 are secured or locked together by any suitable means SUCtl as bonding, an interference fit, or as shown in the drawing, one or more openings 32 in the sleeve receiving complementary projections 34 on the core when it is pressed into mating engagement with the sleeve. The inner diameter of sleeve 16, outer diameter of core 18, and inner tapered threaded surface 24 of the core are designed, along with rigid sleeve 16, to place the external and internal threads 12, 24 respectively under sufficient Lorce to sealingly secure end cap 10 to pipe 14 when the end cap is screwed tightly thereon by any suitable tool, such as a pipe wrench or the like, not shown. Although openings 32 and projections 34 are shown as circular, they, of course, can be of any r ~
other suitable shape, such as square, rectan~ul~r, or the like.
With reference to Figs. 3 and 4, parts simiLar to parts shown in Figs. 1 and 2 will be denoted by the same numerals primed and do-lble-primed, respectively. In these figures, end caps 10', 10" of thiS invention are shown applied to two different types of externally threaded pipes 14', 14" respectively. In these figures, the sleeves 16', 16" are substantially identical to sleeve 16 of Fig. 1, and the inner cores 18', 18" have a common outer diameter, but different shaped inner peripheries 24', 24" conforming to the external threads 12 ' 12a respectively of the pipes. Accordingly, manufacture of end caps for any type of externally threaded pipe end portion is facilitated by providing common sleeves 16, 16', 16" of one design, and inner cores 18, 18', 18" of varied design. The inner cores have a common outer diameter and surface 26, 26', 26", and different inner threaded surfaces 24, 24~, 24~ designed to conform to the different externally threaded pipes 14, 14', 14" shown in the drawing, and others that may be available on the market.
The Fig. 4 end cap 10" is further modified to protect the metal seaL at the left or inner end of the end cap. This is achieved by a metal ring 23 secured to the end cap by any suitable means, such as spot welding or the like. Ring 23 extends over and p-rotects the inner end of core 18", and assists in maintaining a tight seal at the left end of the end cap.
Fig. 4 is a view similar to Figs. 1 and 2 of a slightly modified protective end cap mounted on external threads of still another type;
Fig. 5 is a segmented view in section of another embodiment of the protective end cap of this invention;
Fig. 6 is a segmental view similar to Fig. 5 of still another embodiment of the protective end cap of this invention;
Fig. 7 is a segmental section view of a protective end cap showing a different way of securing the inner core to the outer sleeve;
Fig. 8 is a segmental end view of the end cap of Fig. 7; and Fig. 9 is a segmental section view of an end cap showing a splined connection between the inner core and outer sleeve~
DET~ILED DESCRIPTION OF EMBODIMENTS OF T~IE INVENTION
With reference to Figs. 1 and 2, a preferred embodiment of a protective end cap 10 is disclosed for protecting external Butress type threads 12 on the end portion of any suitable pipe, conduit, casing or the like designated 14. End cap 10 is formed from two interlocking parts, an outer sleeve 16 and an inner core 1~.
Outer sleeve 16 is preferably made from any suitable rigid material such as steel. Sleeve 1~ is preerably of a cylindrical configuration throughout most of its length. The sleeve further has a radially inwardly curved outer end portion 20 overlapping the end surface 22 of pipe 14 when the end cap is mounted on the end of a pipe.
Inner core 18 i6 preferably made of any suitable high-impact plastic. ~ore 18 has an inner threaded tapered surface 24 for threadingly engaging tapered external threads 12 on pipe 14 when end cap 10 is screwed onto the end of the pipe. The interengaging threads 12, 24 hold the end cap on the pipe and provide a seal so that moisture does not contact the pipe threads. Core 18 further has an outer peripheral surface 26 and curved outer end portion 28 conforming to a portion of the inner peripheral surface 30 of sleeve 16. End portion 28 further has a radially inwardly extending section 27 interposed between sleeve end portion 20 and pipe end surface 22 of a width or thickness approximately 0.10 cm (0.04 inch). Core 18 also has a left or inner end rim 29 of greater diameter than sleeve end 33 to protect the sleeve end from damage from external forces or blows, and to prevent the sleeve end from damaging expose~ pipe threads on other pipes during handling. End rim 29 has a tapered edge 31 for deflecting blows directed against the rim.
Sleeve 16 and core 18 are secured or locked together by any suitable means SUCtl as bonding, an interference fit, or as shown in the drawing, one or more openings 32 in the sleeve receiving complementary projections 34 on the core when it is pressed into mating engagement with the sleeve. The inner diameter of sleeve 16, outer diameter of core 18, and inner tapered threaded surface 24 of the core are designed, along with rigid sleeve 16, to place the external and internal threads 12, 24 respectively under sufficient Lorce to sealingly secure end cap 10 to pipe 14 when the end cap is screwed tightly thereon by any suitable tool, such as a pipe wrench or the like, not shown. Although openings 32 and projections 34 are shown as circular, they, of course, can be of any r ~
other suitable shape, such as square, rectan~ul~r, or the like.
With reference to Figs. 3 and 4, parts simiLar to parts shown in Figs. 1 and 2 will be denoted by the same numerals primed and do-lble-primed, respectively. In these figures, end caps 10', 10" of thiS invention are shown applied to two different types of externally threaded pipes 14', 14" respectively. In these figures, the sleeves 16', 16" are substantially identical to sleeve 16 of Fig. 1, and the inner cores 18', 18" have a common outer diameter, but different shaped inner peripheries 24', 24" conforming to the external threads 12 ' 12a respectively of the pipes. Accordingly, manufacture of end caps for any type of externally threaded pipe end portion is facilitated by providing common sleeves 16, 16', 16" of one design, and inner cores 18, 18', 18" of varied design. The inner cores have a common outer diameter and surface 26, 26', 26", and different inner threaded surfaces 24, 24~, 24~ designed to conform to the different externally threaded pipes 14, 14', 14" shown in the drawing, and others that may be available on the market.
The Fig. 4 end cap 10" is further modified to protect the metal seaL at the left or inner end of the end cap. This is achieved by a metal ring 23 secured to the end cap by any suitable means, such as spot welding or the like. Ring 23 extends over and p-rotects the inner end of core 18", and assists in maintaining a tight seal at the left end of the end cap.
3 With reference to Fig. 5, curved end portion 28 of Figs. 1-4 is modified to provide a radially extending section 27 of greater thickness. In this embodiment, section 27 has a width approximately one and one-half times the pitch diameter of the pipe threads, or approximately 0.~6 cm (0.18 inch~. With a section 27 of this thickness, any blow imparted to end portion ~0 will axially move end cap 10 relative to the pipe a sufficient distance to cause most of the core threads 24 to shear 3r~h~
off. This will dissipate a large portion of the ener~y from the blow and provide greater protection for the pipe threads.
With reference to Fig. 6, an annular m~tal in6ert 36, such as a washer, is embedded in or associated with section 27 of core 1~. Washer 36 may ~e emb~dded in ~ection 27 during the molding operation. Alternatively, section 27 may be provided with an annular slot, and w~sher 36 split to allow contraction of the washer for in~ertion into the groove. When released, the washer oxpand~ fllllng the ~lot. Curve~ en~ portion 2~
of sleeve 16 and section 27 of core 18 protectively overlap the pipe end surface 22 with metal washer 36 in alignment with the pipe end surface. Accordingly9 any external force directed against the curved end ~0 of the sleeve by any means such as dropping the pipe on the capped end, for example, i9 absorbed by curved end portion 20, section 27 and metal wastler ~6 as they are forced toward the pipe end surface 22. rhis force absorption prevents damage to tt-e external and internal threads 12, 24, respectively. Such dalnage, if not prevented, might necessitate retapping the external threads 12, or cutting off the damaged end of pipe 14 and rethreading it.
Core 18 of the end cap is further provided with a closure member 46 integral with and depending from section 27 to prevlent dirt or the like from entering a pipe 14 when the end cap is mounted thereon. Closure member 46 is a thin membrane having one or Inore tear flaps 4~ defined by score lines 50. ~ach fla~ 48 further has an opening 52 3 extending therethrough to provide proper ventilation of the pipe opening or cavity. 'rhe opening 52 further allows in6ertion of a finger or the like therethrou~h to enable tearing out the flap 4B along its score lines 50. Removal of the flaps 48 allows insertion of any suitable end cap removing ~ool, not shown, into the pipe for hammering a shoulder 54 on section 27 of the core for relnovill~ an en~
cap lQ that is stuck on the pipe, i.e. canno~ be removed !3, a~ ? ~
~7--by unscrewing the end cap. In Fi~s. 1-3, closure member 46 is the ~ame width as, and an extension of, section 27.
~l In Fig. 5, closure member 46 extends from the inner edge of section 27, whereas in Fig. 6 it extends from section 27 between washer 36 and sleeve end portion 20.
Preferably, the inner suriace of melllber 46 i~ in ~lignment with the outer surface of washer 36 to provide a guide for insertion of washer 36 into a receiving slot in section 27.
Referring to Figs. 7 and 8, another means for locking together a sleeve 16 and core 18 is shown. The locking means comprises notches 40 along the outer curved end portion 20 of sleeve 16 for receiving flexible fingers 42 on core 18. The fingers 42 have tapered ribs 44 which are flexed downwardly as the fingers are pressed through notches 40, and then flex upwardly in front of curved portion 20 of sleeve 16 to lock the sleeve to the core.
With reference to Fig. 4, means such as key-grooves 41 on sleeve 16 and splines 43 on core 18 are shown for guiding the core into the sleeve of an end cap so that projections 34 or fingers 42 on the core will line up with and enter openings 32 or notches 40 respectively in the sleeve.
The invention has been described in detail with particlar reference to preferred embodiments, but it will be understood that variations and modifications can be effected withi,n the spirit and scope of the invention as described. For example, instead of providin~ a cylindrical sleeve 16, the sleeve could be tapered or frusto-conically formed. In such a modification, the outer peripheral surface 26 of core 18 would also be tapered or frusto conical to conform to the inner surface 30 of the sleeve. Also, core 18 could be formed without tear flaps 48, or without a closure member 46.
off. This will dissipate a large portion of the ener~y from the blow and provide greater protection for the pipe threads.
With reference to Fig. 6, an annular m~tal in6ert 36, such as a washer, is embedded in or associated with section 27 of core 1~. Washer 36 may ~e emb~dded in ~ection 27 during the molding operation. Alternatively, section 27 may be provided with an annular slot, and w~sher 36 split to allow contraction of the washer for in~ertion into the groove. When released, the washer oxpand~ fllllng the ~lot. Curve~ en~ portion 2~
of sleeve 16 and section 27 of core 18 protectively overlap the pipe end surface 22 with metal washer 36 in alignment with the pipe end surface. Accordingly9 any external force directed against the curved end ~0 of the sleeve by any means such as dropping the pipe on the capped end, for example, i9 absorbed by curved end portion 20, section 27 and metal wastler ~6 as they are forced toward the pipe end surface 22. rhis force absorption prevents damage to tt-e external and internal threads 12, 24, respectively. Such dalnage, if not prevented, might necessitate retapping the external threads 12, or cutting off the damaged end of pipe 14 and rethreading it.
Core 18 of the end cap is further provided with a closure member 46 integral with and depending from section 27 to prevlent dirt or the like from entering a pipe 14 when the end cap is mounted thereon. Closure member 46 is a thin membrane having one or Inore tear flaps 4~ defined by score lines 50. ~ach fla~ 48 further has an opening 52 3 extending therethrough to provide proper ventilation of the pipe opening or cavity. 'rhe opening 52 further allows in6ertion of a finger or the like therethrou~h to enable tearing out the flap 4B along its score lines 50. Removal of the flaps 48 allows insertion of any suitable end cap removing ~ool, not shown, into the pipe for hammering a shoulder 54 on section 27 of the core for relnovill~ an en~
cap lQ that is stuck on the pipe, i.e. canno~ be removed !3, a~ ? ~
~7--by unscrewing the end cap. In Fi~s. 1-3, closure member 46 is the ~ame width as, and an extension of, section 27.
~l In Fig. 5, closure member 46 extends from the inner edge of section 27, whereas in Fig. 6 it extends from section 27 between washer 36 and sleeve end portion 20.
Preferably, the inner suriace of melllber 46 i~ in ~lignment with the outer surface of washer 36 to provide a guide for insertion of washer 36 into a receiving slot in section 27.
Referring to Figs. 7 and 8, another means for locking together a sleeve 16 and core 18 is shown. The locking means comprises notches 40 along the outer curved end portion 20 of sleeve 16 for receiving flexible fingers 42 on core 18. The fingers 42 have tapered ribs 44 which are flexed downwardly as the fingers are pressed through notches 40, and then flex upwardly in front of curved portion 20 of sleeve 16 to lock the sleeve to the core.
With reference to Fig. 4, means such as key-grooves 41 on sleeve 16 and splines 43 on core 18 are shown for guiding the core into the sleeve of an end cap so that projections 34 or fingers 42 on the core will line up with and enter openings 32 or notches 40 respectively in the sleeve.
The invention has been described in detail with particlar reference to preferred embodiments, but it will be understood that variations and modifications can be effected withi,n the spirit and scope of the invention as described. For example, instead of providin~ a cylindrical sleeve 16, the sleeve could be tapered or frusto-conically formed. In such a modification, the outer peripheral surface 26 of core 18 would also be tapered or frusto conical to conform to the inner surface 30 of the sleeve. Also, core 18 could be formed without tear flaps 48, or without a closure member 46.
Claims (6)
1. A protective end cap for protecting the external threaded portion and end portion of a pipe comprising:
a metal sleeve having a first radially inwardly curved end portion substantially overlapping the end of said pipe;
a substantially rigid metal insert disposed between said inwardly curved end portion of said sleeve and said end of said pipe; and a resilient plastic core having a first portion dis-posed between said sleeve and the threaded portion of said pipe and a second impact absorbing inwardly curved end portion disposed between said metal insert and said inwardly curved end portion of said sleeve.
a metal sleeve having a first radially inwardly curved end portion substantially overlapping the end of said pipe;
a substantially rigid metal insert disposed between said inwardly curved end portion of said sleeve and said end of said pipe; and a resilient plastic core having a first portion dis-posed between said sleeve and the threaded portion of said pipe and a second impact absorbing inwardly curved end portion disposed between said metal insert and said inwardly curved end portion of said sleeve.
2. The cap of claim 1 further comprising means on said sleeve and said core for locking said sleeve and said core together.
3. The cap of claim 2 further comprising thread means on the inner periphery of said core threadingly engageable with the external threaded end portion of said pipe when the cap is screwed on to the end portion of said pipe.
4. The cap of claim 1 wherein said second impact absorbing portion of said core has a thickness at least one and one half times the pitch of said external threads.
5. The cap of claim 1 wherein said metal insert is at least partially embedded in and carried by said core.
6. The cap of claim 1 wherein said second impact absorbing portion has an integral closure member for closing off said core.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23681181A | 1981-02-23 | 1981-02-23 | |
| US236,811 | 1988-08-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1176582A true CA1176582A (en) | 1984-10-23 |
Family
ID=22891066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000396536A Expired CA1176582A (en) | 1981-02-23 | 1982-02-18 | Protective end cap for external pipe threads |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1176582A (en) |
| GB (1) | GB2093426B (en) |
| HK (1) | HK35387A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4549337A (en) * | 1983-07-01 | 1985-10-29 | Alco Industries, Inc. | Method of making a composite thread protector |
| US4487228A (en) * | 1983-12-19 | 1984-12-11 | Shell Oil Company | Weather-resistant and self-draining thread protector |
| FR2557953B1 (en) * | 1984-01-09 | 1986-07-18 | Vallourec | PROTECTIVE DEVICE FOR THREADED TUBE JUNCTION ELEMENTS |
| US4796668A (en) * | 1984-01-09 | 1989-01-10 | Vallourec | Device for protecting threadings and butt-type joint bearing surfaces of metallic tubes |
| JPH0764362B2 (en) * | 1986-08-01 | 1995-07-12 | キヤシング プロテクタ−ズ，インコ−ポレ−テツド | End cap for pipe protection |
| US7284770B2 (en) | 2004-02-02 | 2007-10-23 | Tenaris Connections Ag | Thread protector for tubular members |
| UA92374C2 (en) * | 2005-11-15 | 2010-10-25 | Тред Гард Текнолоджи Лтд. | Assembled protector for a pipe end provided with external or internal thread |
| CN203283876U (en) * | 2012-12-19 | 2013-11-13 | 乔士军 | Large-caliber thread protector |
| EP4365101A1 (en) * | 2022-11-02 | 2024-05-08 | Vallourec Oil And Gas France | Threaded pipe end protector |
-
1982
- 1982-02-17 GB GB8204592A patent/GB2093426B/en not_active Expired
- 1982-02-18 CA CA000396536A patent/CA1176582A/en not_active Expired
-
1987
- 1987-04-30 HK HK35387A patent/HK35387A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2093426B (en) | 1985-06-12 |
| GB2093426A (en) | 1982-09-02 |
| HK35387A (en) | 1987-05-08 |
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