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WO1998031959B1 - Thread-forming pipe plug - Google Patents

Thread-forming pipe plug

Info

Publication number
WO1998031959B1
WO1998031959B1 PCT/US1997/023791 US9723791W WO9831959B1 WO 1998031959 B1 WO1998031959 B1 WO 1998031959B1 US 9723791 W US9723791 W US 9723791W WO 9831959 B1 WO9831959 B1 WO 9831959B1
Authority
WO
WIPO (PCT)
Prior art keywords
fastener
plug
opening
recited
unthreaded
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.)
Ceased
Application number
PCT/US1997/023791
Other languages
French (fr)
Other versions
WO1998031959A3 (en
WO1998031959A2 (en
Filing date
Publication date
Priority claimed from US08/784,049 external-priority patent/US6142186A/en
Priority to CA002278476A priority Critical patent/CA2278476C/en
Priority to JP53438198A priority patent/JP4148368B2/en
Priority to EP97953415A priority patent/EP0951626B1/en
Priority to AU57167/98A priority patent/AU741690B2/en
Priority to DE69732654T priority patent/DE69732654T2/en
Application filed filed Critical
Priority to BR9714211-5A priority patent/BR9714211C1/en
Publication of WO1998031959A2 publication Critical patent/WO1998031959A2/en
Publication of WO1998031959A3 publication Critical patent/WO1998031959A3/en
Publication of WO1998031959B1 publication Critical patent/WO1998031959B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Abstract

The invention involves primarily a novel self-thread-forming plug and fastener (10, 110, 210, 310, 410, 510, 610, 710) for sealing and forming internal threads (30, 130, 230, 330, 430, 530, 634, 730) in an opening (20) in a workpiece (P). The plug and fastener includes: a shank (12) having a driving portion (11) thereon and a first threaded portion or thread-forming portion (14, 114, 214, 314, 414, 514, 614, 714) for cold forming internal threads in an internal wall portion (18, 118, 218, 318, 418, 518, 618, 718) of the opening in accordance with a predetermined configuration, such as the NPTF standard. A second threaded portion (15, 115, 215, 315, 415, 515, 615, 715) is provided adjacent the thread-forming portion to engage with the internal threads formed by the first threaded portion in interfering sealed engagement. The plug and fastener of the present invention may further include a sealing portion extending from the thread-forming portion toward an end portion of the shank which initially enters the workpiece opening.

Claims

O 98 31959 Λ W™™ . ™ * PCT/US97/23791 AMENDED CLAIMS [received by the International Bureau on 2 November 1998 (02.11.98); original claims 1-3, 5-6, 11-12, 14-19 and 22 amended; remaining claims unchanged (6 pages)]
1. A plug and fastener (10, 110, 210, 310, 410, 510, 610, 710) for sealing in an opening (20) in a workpiece (P), said plug and fastener CHARACTERIZED BY: a shank (12) having a threaded portion (14, 114, 214, 314, 414, 514, 614, 714) for engaging with an internal wall (18, 118, 218, 318, 418, 518, 618, 718) of said opening and providing a first seal, and having an unthreaded sealing portion (16, 116, 216, 316, 416, 516, 616, 716) extending from said threaded portion which initially enters said opening, said unthreaded sealing portion being configured to engage and provide a second seal against the internal wall of said opening.
2. A plug and fastener (10, 210, 510, 610) as recited in claim 1 , CHARACTERIZED IN THAT said unthreaded sealing portion (16, 216, 516, 616) comprises a plurality of annular sealing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632).
3. A plu and fastener (10, 110, 210, 310, 410, 510, 610, 710) as recited in claim 2, CHARACTERIZED IN THAT said unthreaded sealing portion (16, 116, 216, 316, 416, 516, 616, 716) is tapered-
4. Aplug and fastener (10, 110, 210, 310, 410, 510, 610, 710) as recited in claim 1, CHARACTERIZED IN THAT said plug and fastener is self thrcad-foπning and includes a tapered thread forming section (14, 114, 214, 314, 414, 514, 614, 714).
23
5. A plug and fastener (10, 110, 210, 310, 410, 510, 610, 710) as recited in claim 1, CHARACTERIZED IN THAT said unthreaded sealing portion (16, 116, 216, 316, 416, 516, 616, 716) is diametrically dimensioned smaller than the smallest minor diameter of said threaded portion (14, 114, 214, 314, 414, 514, 14, 714), in order to ensure that said unthreaded sealing portion can be withdrawn through an internal thread (30, 130, 230, 330, 430, 530, 634, 730) in said opening (20) without disturbance of said internal thread by the withdrawal of said unthreaded sealing portion, so that said internal thread remains intact to allow re-engagement of said plug therewith.
6. A plug and fastener (10, 210, 510, 610) as recited in claim 1 , CHARACTERIZED IN THAT said unthreaded sealing portion (16, 216, 516, 616) comprises a plurality of longitudinally spaced annular sealing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632) arranged for respective sealing engagement of said internal wall (18, 218, 518, 618) of said opening (20).
7. A plug and fastener ( 10, 210, 510, 610) as recited in claim 6, CHARACTERIZED IN THAT said sealing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632) have respective outer diameters differentially dimensioned in relationship and converging toward an end portion of said shank (12).
8. A plug and fastener (10, 210, 510, 610) as recited in claim 7, CHARACTERIZED IN THAT each of said seeing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632) has a longitudinally extending and radially uniform peripheral surface defining said differential diameters.
9. A plug and fastener (10, 210, 510, 610) as recited in claim 8, CHARACTERIZED IN THAT each of said sealing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632) further includes a longitudinally leading face (22a, 24a, 26a) extending angularly from said respective radially uniform peripheral surface in order to provide sealing against said internal wall (18, 218, 518, 618) of said opening (20).
10. A plug and fastener (10, 210, 510, 610) as recited in claim 8, CHARACTERIZED BY at least three sealing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632).
11. A plug and fastener ( 10, 210, 510, 610) as recited in claim 1 , CHARACTERIZED IN THAT said unthreaded sealing portion (16, 216, 516, 616) comprises a plurality of annular sealing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632) having outer diameters (222a, 228a) differentially dimensioned in relationship and converging toward an end portion of said shank (12).
12. A plug and fastener (410) as recited claim 1, CHARACTERIZED IN THAT said unthreaded sealing portion (416) comprises a bulbous curved peripheral surface (422).
13. A plug and fastener (410) as recited in claim 12, CHARACTERIZED IN THAT said curved peripheral surface (422) forms a truncated extension from a reduced shank portion (417).
25
14. A plug and fastener (110, 510) as recited in claim 1, CHARACTERIZED IN THAT said unthreaded sealing portion (116, 516) includes a cylindrical extension which is brought into engagement with the internal wall (118, 518) of said opening (20) to deform said internal wall and provide a seal.
15. A plug and fastener (310, 710) as recited in claim 1 , CHARACTERIZED IN THAT said unthreaded sealing portion (316, 716) is of a truncated conical configuration and engages said internal wall (318, 718) of said opening (20) with an interference fit to provide a seal.
16. A method of providing a seal between a plug and fastener (10, 110, 210, 310, 410, 510, 610, 710) and a workpiece (P) having an opening (20) formed therein, said method CHARACTERIZED BY the steps of: providing said plug and fastener, said plug and fastener having a shank (12), a driving portion (11) formed on the shank (12), a threaded portion (14, 114, 214, 314, 414, 514, 614, 714) for engaging an internal wall (18, 118, 218, 318, 418, 518, 618, 718) of said opening and providing a first seal, and an unthreaded sealing portion (16, 116, 216, 316, 416, 516, 616, 716) extending from said threaded portion which initially enters said opening, said unthreaded sealing portion being configured to engage and provide a second seal against the internal wall of said opening; providing said workpiece having said opening; engaging said plug and fastener in said opening and driving said plug and fastener into said opening such that the unthreaded sealing portion enters said opening and said threaded portion engages said internal wall; and continuing said threaded engagement, said unthreaded sealing portion engaging and sealing against the internal wall of said opening.
26
17. A method as recited in claim 16, CHARACTERIZED IN THAT said unthreaded sealing portion (16, 116, 216, 316, 416, 516, 616, 716) is diametrically dimensioned smaller than the smallest minor diameter of said first threaded portion (14, 114, 214, 314, 414, 514, 614, 714), wherein said method further comprises withdrawing said unthreaded sealing portion through the internal thread (30, 130, 230, 330, 430, 530, 634, 730) formed in said opening (20) by said threaded portion without disturbing said internal wall, so that said internal wall remains intact to allow re-engagement of said plug and fastener therewith.
18. A method as recited in claim 16, CHARACTERIZED IN THAT said unthreaded sealing portion (16, 216, 316, 516, 616) of said plug and fastener (10, 210, 310, 510, 610, 710) comprises an annular sealing ring (22, 24, 26, 222, 224, 226, 228, 322, 522, 524, 526, 622, 624, 626, 628, 630, 632, 722) arranged for sealing engagement of said internal wall (18, 218, 518, 618) of said opening (20).
19. A method as recited in claim 16, CHARACTERIZED IN THAT said unthreaded sealing portion (16, 216, 516, 616) of said plug and fastener (10, 210, 510, 610) comprises a plurality of longitudinally spaced annular sealing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632) arranged for respective sealing engagement of said internal wall (18, 218, 518, 618) of said opening (20).
27
20. A method as recited in claim 19, CHARACTERIZED IN THAT said sealmg rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632) of said plug and fastener (10, 210, 510, 610) have respective outer diameters differentially dimensioned in relationship and converging toward an end portion of said shank (12).
21. A method as recited in claim 19, CHARACTERIZED IN THAT said plug and fastener (10, 210, 510, 610) includes at least three sealing rings (22, 24, 26, 222, 224, 226, 228, 522, 524, 526, 622, 624, 626, 628, 630, 632).
22. A method as recited claim 16, CHARACTERIZED IN THAT said unthreaded sealing portion (416) of said plug and fastener (410) comprises a bulbous curved peripheral surface (422).
23. A method as recited in claim 16, CHARACTERIZED IN THAT said plug and fastener (10, 110, 210, 310, 410, 510, 610, 710) is self thread- forming and includes a tapered thread forming section (14, 114, 214, 314, 414, 514, 614, 714).
28
PCT/US1997/023791 1997-01-17 1997-12-22 Thread-forming pipe plug Ceased WO1998031959A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BR9714211-5A BR9714211C1 (en) 1997-01-17 1997-12-22 Thread-forming pipe plug
JP53438198A JP4148368B2 (en) 1997-01-17 1997-12-22 Threaded pipe stopper
EP97953415A EP0951626B1 (en) 1997-01-17 1997-12-22 Thread-forming pipe plug
AU57167/98A AU741690B2 (en) 1997-01-17 1997-12-22 Thread-forming pipe plug
DE69732654T DE69732654T2 (en) 1997-01-17 1997-12-22 THREAD FORMING PIPE CLOSURE
CA002278476A CA2278476C (en) 1997-01-17 1997-12-22 Thread-forming pipe plug

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/784,049 1997-01-17
US08/784,049 US6142186A (en) 1997-01-17 1997-01-17 Thread-forming pipe plug

Publications (3)

Publication Number Publication Date
WO1998031959A2 WO1998031959A2 (en) 1998-07-23
WO1998031959A3 WO1998031959A3 (en) 1998-11-05
WO1998031959B1 true WO1998031959B1 (en) 1998-12-23

Family

ID=25131190

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/023791 Ceased WO1998031959A2 (en) 1997-01-17 1997-12-22 Thread-forming pipe plug

Country Status (10)

Country Link
US (1) US6142186A (en)
EP (1) EP0951626B1 (en)
JP (1) JP4148368B2 (en)
AU (1) AU741690B2 (en)
BR (1) BR9714211C1 (en)
CA (1) CA2278476C (en)
DE (1) DE69732654T2 (en)
ES (1) ES2238737T3 (en)
TW (1) TW390950B (en)
WO (1) WO1998031959A2 (en)

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