JP2000120635A - Thread-formed pipe plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe plug capable of being installed removably, driven in tapping, and pressure-tight sealing for the screw with no use of compound at the end of a pipe for fluid or liquid conveyed inside the pipe. SOLUTION: A plug and fastener are engaged with the internal wall of an opening, and the arrangement includes a shank having a portion 14 threaded for establishing a first seal and a sealing part 16 not threaded to be inserted into the opening near the threaded portion, and the unthreaded portion is engaged with the internal wall of the opening to offer a second seal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapping type fastener, and more particularly to a detachable, tapping and screwed-in fluid or liquid transported in a pipe without compounding at the end of the pipe. The present invention relates to a pipe stopper for sealing a screw with pressure.

[0002]

2. Description of the Related Art In the United States, domestic standards for pipe stopper screws have been enacted and widely used. These are well known in the prior art, and are known as US pipe screw standards for fuel oil, abbreviated as NPT.
F (National Pipe Thread standards-Fuel andoil,
viz.) The standard is called. Tapered N of this standard product
PTF pipe stoppers have been developed for use in engaging with already tapped pipes or parts.
The pipe is first drilled with a straight hole, tapered reamer is provided to provide a tapered hole, and finally the tapered reamer is tapped with an NPTF taper tap to form an internal thread. Providing a tapered opening and forming the internal thread into a predetermined shape as designed. In this NPTF standard pipe plug, since the valleys of both the outer thread and the inner thread are slightly cut away from the ridge, the valley is designed to have a flat portion wider than the ridge and to provide metal-to-metal contact. Yes, the deformation occurs at the peaks and valleys until the side contact of the screw is reached, consistent with the threaded engagement. The deformation of the inner and outer thread ridges provides a sealing action at both the outer and inner diameters, and theoretically prevents helical leakage through the threads. However, due to the capillary action of the fluid or gas being transported through the pipe, there is a potential helical leakage path along the screw screw helix unless the deformation completely seals the helical path. become.

[0003]

One drawback of NPTF standard pipe plugs is that the helical path is not sealed along the threads, as diagonal threading can occur when installing the NPTF plug into a tapped hole. Become. Since the oblique screwing is not detected, fluid leakage at the time of pressurization occurs in the plug sealing portion during use. If a diagonal screwing is detected, the connection must often be discarded or rebuilt, which in any case is costly and time consuming.

[0004] It is therefore an object of the present invention to be able to cold form threads in pipe walls, to ensure fluid sealing of pipes without the use of thread sealing compounds, and to standardize later if necessary. An object of the present invention is to provide a pipe plug that can be replaced with an NPTF pipe plug.
Further, according to the present invention, a sealed pipe plug can be formed in a cost-effective manufacturing and assembly procedure because tapping of the pipe is not required before the plug is engaged.
Furthermore, since the pipe stopper of the present invention forms a female NPTF screw when assembled with an inner wall that is not tapped and assembled, it is possible to prevent oblique screwing.
As will be described more fully below, the sealing portion of the stopper of the present invention provides a secure seal and the interengaged NPTF
Reinforces the seal achieved by the screw to ensure leak-free joining. It is further envisioned that the novel plug of the present invention can be used with openings that are tapered inside the part and with openings that are not tapered.

[0005]

In accordance with the present invention, a plug and fastener combination for sealing an opening formed in a component extends from a non-spiral sealing portion and the sealing portion. A shank having a threaded portion, wherein the threaded portion first enters the opening and engages an inner wall of the opening to provide a first seal, while the sealed portion comprises It is configured to engage the inner wall to provide a second seal.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIGS. 1-3, the pipe plug 10 has a tapered shank 12 which includes a tapered threaded portion 14 from which (gradually) tapered. The unthreaded sealing end 16 extends. An NPTF standard tapered thread formation 15 is provided between the thread forming portion 14 and the screwing head 11. The thread forming portion 14 can be of any known type of thread forming structure, such as a tri-point design. One of the designs for forming a screw in this manner is the trademark TAP.
It is well known that it is commercially available as TITE (R). Any type of structure that forms the thread of portion 14 is acceptable, and the tricuspid TAPITE® structure is disclosed herein by way of example only and is not a required element of the invention. In the embodiment shown in FIGS. 1 to 3,
The threaded portions 14 and 15 are adapted to 1 / 8-27 standard NPTF pipe tap tap dimensions and have a taper of, for example, 1.7899 °. The thread-forming portion 14 reams the smoothness of the bore or bore 20 of the pipe or part P and cold-forms the internal thread to a tapered wall 18 to a standard that conforms to NPTF. As shown in FIG. 1, the sealed end 16 of the plug 10 has an initially unthreaded opening 19.
And can be inserted without being engaged.

[0007] Since the NPTF standard is well known to those skilled in the art,
The screws 14, 15, 30 are not shown to scale.
The part 14 forming the screw and the whole screw 15 are, for example, NPT.
It should be understood that they are formed to a standard such as the F standard. The thread forming part 14 is the pipe lumen 2
It is designed to form an internal thread 30 on the zero tapered wall 18. The inner screw 30 formed in this way is NPT
According to the F standard, it is also configured to engage with a screw 15 formed according to the selected NPTF standard. When the selected NPTF screws 15 and 30 are engaged, a metal-to-metal interference engagement occurs between each of the valleys and peaks of the screws 15 and 30 according to the standard. This engagement provides a metal-to-metal seal along the helical thread path. In this way, it should be understood that the screws 14, 15, 30 and the screw structure of the embodiment of FIGS. 4 to 10 are structures conforming to the NPTF standard and are schematically illustrated.

As can be seen in FIG. 1, the sealing end 16 has a threaded portion 14 formed by a small diameter intermediate portion 17.
Away from In the embodiment of FIG.
Are three adjacent but distant sealing rings 22, 24,
26, which are progressively smaller in diameter,
There is a tapered relationship between them, as best shown in the enlarged view of FIG. 3 (described more fully below).

The sealing rings 22, 24, 26 have a diameter along the tapered pipe opening 19 that is substantially smaller than the first decreasing lumen diameter. Thus, when the thread forming portion 14 begins to cold form or tap the female thread 30 (FIG. 2) into the smoothly tapered pipe walls 18, 19, there is an initial engagement therebetween. do not do. Therefore, the sealing rings 22, 24,
26 does not initially engage the tapered wall and does not add a threading load to the operation of forming a preliminary female screw. However, as the threading operation proceeds to the point where the threaded head 11 is seated against the periphery of the opening 19a of the pipe or part, the tip sealing rings 22, 24, 26 become tapered within the pipe. The cavity wall 18 is advanced into interference engagement. Each ring, as shown in FIG.
Each sealing ring 22, 2 radially inward from the wall 18
4, 26 angled tip surfaces 22a, 24a, 26a
, The annular sealing deformations 23, 25, 27 are gradually tapped. The resulting deformed rings 23, 25, 27 of the toroidally formed pipe wall provide three additional pressure tight seals to completely seal the lumen 18. Furthermore, these variants 23, 25, 27 and the seals achieved by them extend around the entire inner circumference of the pipe or part wall 18, which is almost completely 360 °. The seal provided by end 16 should provide a complete seal of lumen 20. The engagement between the end 16 and the tapered wall 18 is used to stress the part or pipe wall, and the stress pattern is schematically shown in FIG.
3 is shown. Further, the NPTF female screw 30 formed by the NPTF screw 15 and the threaded portion 14
The engagement with provides a standard NPTF type seal along the helical leakage path provided by the engaged screw. This sealing along the path provided by the sealing end 16 ensures that there is no leakage with the stopper.

[0010] Further, bearing in mind the above description of the fabrication method associated with prior art NPTF designs, the above disclosed invention has many advantages. First, the thread forming portion 14 of the plug has a tapered internal thread 30 on the part.
So that the step of tapping the inner tapered lumen is eliminated. Second, NPT
Since the F-female or internal thread 30 is formed when the plug and the part are engaged, there is no danger of oblique threading. Thus, rework and waste associated with prior art manufacturing methods are eliminated. Also, the sealing end 16 and the wall 18 of the
It should be noted that the engagement of the pipe or part P with stress as shown by X1-X3 allows the pipe or part P to better withstand the internal pressure and prevent leakage.

Referring again to FIG. 2, the female screw 30
Has the smaller diameter than the original smooth wall diameter on which the opposite thread is created by cold forming or tapping, so that the mating diameter 31 of the smallest female formed is also the largest seal. It becomes larger than the outer shape of the ring 22. Since the three sealing rings 22, 24 and 26 can be pulled out with a clearance through the smallest inner diameter 31 of the formed female screw 30, the stopper 10
It will not be disturbed or deformed if it is completely unscrewed and removed from the pipe or piece. Therefore, since the female screw 30 remains intact,
Plug 10 or any replacement N with NPTF thread
The PTF pipe stopper can be screwed into the female screw 30 to reseal the pipe. In other words, the engagement of the NPTF standard stopper provides an NPTF-type seal that is expected to deform the screw, but is not as effective as the double seal achieved in the present invention.

Referring again to FIG. 3, in the illustrated embodiment of the plug and fastener 10, the end sealing rings 22,
Numerals 24 and 26 have a tapered relationship that coincides with the original smooth pipe side wall 18 and are arranged, for example, at about 1.7899 ° with respect to the pipe axis (not shown). Each of the rings 22, 24, 26 is separated by small diameter flats which cooperate with the rings to form a series of spaced grooves. These annular sealing rings 22, 2 are simultaneously formed in a single operation by the formation of the screws 14 and 15.
To form a roll from 4,26, the volume of material of the rings should desirably be equal to one another. In order to achieve such an equal volume of the ring, and to create a tapered relationship between the relatively converging profile and the ring, the longitudinal width of the ring is opposite to the converging reduction of profile. So that the sealing ring 26 has the smallest profile and the longest flat width 26b in the longitudinal direction. The front face 22a, 24a, 26a of each ring desirably forms an angle of approximately 45 ° with the width 22b, 24b, 26b of each face, and the sealing rings 22, 24, 2
When tapping the pipe wall 18 by embedding 6, the resistance between these front faces is minimized to form annular inner wall deformation rings 23, 25, 27. Each annular rear surface 22c, 24c, 26c may form an angle of approximately 30 ° with each ring width 22b, 24b, 26b as shown in FIG. By doing so, the foremost region of the stress X1 is the widest and the region X3 is the narrowest with reference to the stress patterns X1 to X3. The degree of the stress becomes larger than X1 in the region X3 because the force concentrates on the area where the radial interference range is larger than the region X1 and smaller in the region X3.

Referring to FIGS. 4 and 4a, a second embodiment of a pipe plug according to the present invention is indicated generally by the reference numeral 110. In this embodiment of the pipe stopper, the unthreaded sealed end portion 116 is a small diameter smooth cylindrical shank portion that extends without taper from the tapered threaded portion 114. The threaded portion 115 is an NPTF standard thread, similar to the thread 15 of the embodiment of FIGS. Since the operation of the parts 114 and 115 corresponds to the operation of the parts 14 and 15 of the embodiment of FIGS. 1 to 3, these functions will not be described in detail. The end of the sealing end 116 has a rounded rim 122 and a threaded portion 114
The initial interference with the tapered lumen wall 118 (FIG. 4a) is minimized as the 0 begins to cold form (FIG. 4a). As shown in FIG. 4a, the cylindrical sealed end portion 1
The sixteen annular leading sidewall portions 117 interfere with the wall 118 to cold-form or tap the annular, 360 ° sealing deformation 123 radially inward from the tapered lumen wall 118 to form a thread. The portion 114 completes the cold forming of the female thread 130 and forms a preceding pressure tight seal when the NPTF screw 115 engages the NPTF internal thread 130 formed by the thread forming section 114. Sealing deformation 123
Provides a secure seal of the sealing end 116 to the tapered pipe wall 118 to prevent leakage upstream of a helical leakage path through a screw 130 formed in the pipe lumen wall 118. The stress pattern of the lumen wall 118 implemented in this embodiment is shown at X4 in FIG. 4a.

Referring now to FIGS. 5 and 5a, there is shown a third embodiment 210 of a pipe stopper according to the present invention, wherein the sealing end 216 comprises four spaced sealing rings 222, 224, 226, and 228. The sealing rings have a tapered relationship such that sealing ring 228 has the smallest peripheral diameter 228a and ring 222 has the largest peripheral diameter 222a.
The sealing rings 222, 224, 226, and 228 perform tapping deformation of the pipe lumen wall 218 to form an annular 360 °.
Pipe wall deformation rings 223, 225, 227, 229
This deformation further increases the sealing deformation of the female pipe wall screw 230 formed against the tapping portion 214 of the tapping screw by adding a pressure tight seal,
The manufacturing is not as complicated as the angled front and rear surfaces provided on the sealing rings 22, 24, 26 of the first pipe plug and fastener embodiment 10 of FIG. 3 shown in FIG. End 2
The stress pattern realized at 16 is shown at X5.

The embodiments of FIGS. 5 and 5a and FIGS. 6-9 and 6a-9a are similar to the embodiments of FIGS. 1-3 and FIGS. 4 and 4a with respect to general fastener design. And includes a drive end and a threaded shank, all in the form of a threaded head. The threaded shank has two parts 21
4 and 215 (FIGS. 6 and 6a). FIG.
3 to FIG. 3. The portions 214, 314, etc. that form the threads are of the general type and type disclosed in connection with portion 14 of FIGS. Again, the type of screw forming structure used in connection with these embodiments is not essential to the invention. As an alternative to the triangular or tricuspid structure described in any of the disclosed embodiments, the thread forming portion 14,
114, 214, etc. may be of a five-leaf design or may be any other thread forming structure, most of which are well known in the art. All that is required is that the parts 14, 114, 214, etc., which form the screw, are the
19 etc. NPTF standard internal thread 30, 130, 230
Etc. can be formed. Correspondingly, the threaded portions 15, 115, 215, etc., are formed by N, formed by the threading portions 14, 114, 214, etc.
It has a NPTF standard structure designed to be compatible with PTF internal threads. Accordingly, with respect to the description that follows with respect to the remaining embodiments of FIGS. 6-9, respective threaded portions 314, 414, etc., 315, 415, etc.
, But these will not be described in detail, and it should be understood that these threaded portions correspond to and function similarly to portions 14, 15, 30 of FIGS. 1-3. It is. Each sealed end portion 316,4
Only new structures such as 16 will be described in detail.

With the above in mind, FIG.
Referring to a, a fourth embodiment of a pipe stopper according to the present invention, indicated by reference numeral 310, includes a sealing end 316 having a single sealing ring 322. The sealing ring 322 is shown in FIG.
a has a generally narrow, uniform cylindrical peripheral surface 324 as best shown in FIG. The peripheral surface 324 has a conically tapered front surface 326 toward which, radially inward from the tapered pipe wall 318, a ring 322 is formed into an annular 360 ° sealing deformation ring 3.
Tap 28. The longitudinal taper of the conical front surface 326 provides a secure seal with the sealing tip 316 and prevents any leakage of the spiral through the female pipe thread 330 cold formed by the thread forming portion 314 of the plug. To form an extended surface that engages the extending lumen wall deformation 328. The stress pattern is shown at X6 in FIG. 6a.
As will be appreciated, the stress is a flat or cylindrical surface 324.
, And decreases toward the end of the sealing portion 316. Again, the seal provided by the sealing portion 316 interfering with the deformation of the lumen in the lumens 318 and 328 provides a pressure tight seal that enhances the overall sealing effect, and the NPTF Acts synergistically with the seal provided by the engagement of the standard screws 315 and 330.

Referring now to FIGS. 7 and 7a, a fifth embodiment 410 of a pipe plug according to the present invention has a generally barrel-shaped or some curved peripheral surface 422 at one end from a small diameter shank portion 417 and also of the plug. The terminal end has a sealed end 416 formed in a truncated area from a truncated end surface 424. The peripheral surface 422 is generally spherical or elliptical, or simply created from some curved surface. The arcuate sealing surface 422 cold-forms the wall 418 to provide a tapped or sheared 360
A sealing deformation 428 is made. Arc-shaped sealing tip surface 42
2 has a smaller diameter than the smallest diameter of the smallest female screw that is cold formed by the thread forming portion 414 of the plug to allow for withdrawal clearance of the sealing tip 416 through the formed female screw 430. The plug can be removed without disturbing the formed female pipe screw. The stress pattern on wall 418 is shown at X7.

Referring to FIGS. 8 and 8a, a sixth embodiment 510 of a pipe stopper according to the present invention comprises a sealing end 51 comprising three cylindrically shaped sealing rings 522, 524, 526.
6 are shown. Sealing rings 522, 5
24, 526 are continuous or stepped in series such that the diameter of each decreases gradually, and the flat ends 52 of the fasteners.
A gradually tapered relationship is formed between these so as to converge toward. This end 527 has a rounded end rim 529, so that an annular wall deformation tapped from the tapered pipe lumen wall 518 against the end 527 is pressure-tightly sealed at the sealing tip 516 of the plug. I will provide a. The sealing rings 522, 524, 526 cause progressive interference and deformation of the lumen wall 518. That is, X
A stress pattern as shown in FIG. 8 is obtained. End 516
The seal realized with 作用 works with the NPTF standard seal realized by the engagement of the screws 515 and 530 to ensure that it does not leak from the plug.

FIGS. 9 and 9a show a seventh embodiment. This seventh embodiment 6 of the pipe stopper according to the invention
10 has a sealing tip 616, the annular and arc-shaped side wall surfaces of which are annular recesses or grooves 623, 625, 62, respectively.
6, ring-shaped rings 622, 624, 626, 628, 6, which are narrowly spaced by 7,629,631
30,632. The interstitial grooves generally provide a sharp leading edge at each sealing ring which bites into the tapered lumen wall 618 to form a series of annular sealing deformations 6.
40, 642, 644, 646, and 650 to form a series of additional pressure tight seals, thereby providing a potential between the female thread 630 formed in the pipe lumen and the thread forming portion 614 of the pipe plug 610. Helical leak path is completely eliminated. The stress pattern realized at end 616 is indicated by X9.

Referring now to FIGS. 10 and 10a,
An eighth embodiment 710 of a pipe stopper according to the present invention has a sealing end 716 having a single elongated sealing ring 722. The sealing ring 722 includes a generally elongated conically tapered peripheral surface 724 and a generally annular sealing ring that bites into an annular, tapered bore wall 718 with sharp edges and radially inward from the wall 718. It has a front rim 726 that shears or taps the deformation 728. The sealing deformation 728 forms an additional pressure-tight seal to the rim 726, with an elongate conical wall 724 providing a sealing surface extending against the tapered wall 718, which, in combination, provide a plug The potential helical leakage path between the female threads 730 formed into the tapered pipe wall 718 at the thread forming portion 714 of 710 is completely eliminated.
The annular sealing deformation 723 that is sheared backward also has a sharp-edged annular rim 7 behind the conical sealing tip wall 724.
25 are formed. The radial clearance of the rear sealing deformation 723 is provided by a reduced diameter intermediate shank portion 717 of the plug 710. Again, the stress pattern is schematically illustrated and is shown at X10.

The sealing ends 16, 116,. . . Although 716 is illustrated in connection with the self-tapping stopper 10, several alternatives should be kept in mind. First, the stopper or stoppers 10, 110,. . . 710 are sealing ends 16 and 11
6 ,. . . 716 can be used without. Furthermore,
Sealed ends 16, 116,. . . 716 is not limited to use with the self-tapping stoppers 10, 110, 710 according to the present invention, but is not self-tapping, but is an NPTF standard that is engaged with a pipe that has been pre-tapped at a part opening. Can be used with stoppers.

FIGS. 11-24 show several combinations of plugs and fasteners 810, 91 according to yet another embodiment of the present invention.
0, 1010, and 1110 are shown. As shown, each has heads 811, 911, 1011, 1111 and threaded portions 814, 914, 1014, 11
14 sealing portions 816, 916, 101
6,1116, including heads 811, 911, 1011,
1111 is a plug and fastener 810, 910, 1010, 1
110 at one end, threaded portions 814, 91
4,1014,1114 are plugs and fasteners 810,91
0, 1010, 1110 at the other opposing end.
Each plug and fastener 810, 910, 1010, 111
0 is each threaded portion 814, 914, 1014, 1
114 is configured to first enter the opening 19 of the component P, and the sealing portions 816, 916, 1016, 11
16 threaded into openings 19 814, 914,
Continue to 1014, 1114. Each plug and fastener 81
When 0, 910, 1010, and 1110 are completely engaged with the openings (FIGS. 12, 14, 16, 18, 20, 22, and 24).
), Each threaded portion 814, 9
14, 1014, 1114 engage the inner wall of opening 19 to form a first seal, and seal portions 816, 916, 10
16, 1116 engage the inner wall of the opening to form a second seal.

Combinations of plugs and fasteners 810, 910,
Each of 1010 and 1110 will be described separately, and differences between them will be described in detail. The plug and fastener 810 shown in FIGS. 11-16 includes a tapered threaded portion 814 and a tapered sealing portion 816. Sealing part 81
6 includes a pair of sealing rings 822, 824;
The diameters 823, 825 of each of the 22, 22 are different and taper or converge toward the threaded portion 814. In other words, the diameter 825 of the sealing ring 824 closer to the threaded portion is smaller than the diameter 823 of the sealing ring 822 closer to the head 811. Further, the sealing ring 82 closer to the threaded portion 814
4 is longer than the longitudinal width 822b of the sealing ring 822 closer to the head 811. In other words, the sealing rings 822 and 824 have peripheral surfaces having different longitudinal widths 822b and 824b, respectively, the widths being inversely proportional to the respective contours 823 and 825, respectively. Preferably, the front surfaces 822a and 824a of each ring 822, 824 form an angle of approximately 45 degrees with the respective widths 822b, 824b so that the sealing ring 822 is formed on the inner surface of the opening 19 as described below. 824 is embedded to help minimize resistance when tapping (for clarity, reference numbers 822, 824, 82
2a, 824a, 822b, 824b are only shown in FIG. 11).

As shown in FIGS. 11 and 12, the plug and fastener 810 can be engaged with the opening 19 of the part P formed by the tapered hole 850 and the tapered receiving hole 852. it can. The hole 850 and the receiving hole 852 are tapered, and the diameter A of the hole 850 is smaller than the corresponding diameter C, and the diameter B of the receiving hole 852 is smaller than the corresponding diameter D, as shown in FIG.

In addition, as shown in FIGS. 13 and 14, the stopper and the fastener 810 have a hole 85 having a tapered opening.
It can be engaged with the opening 19 of the component P formed from the accepting hole 852a that is not tapered to zero. As shown in FIG. 13, the diameters B and D of the receiving hole 852a are substantially equal, but the diameter A of the hole 850 is smaller than the diameter C.
Further, as shown in FIG. 15 and FIG.
10 can be engaged with the opening of the component P formed by the hole 850a whose opening is not tapered and the receiving hole 852a whose taper is not tapered. In this case, as shown in FIG. 15, the diameters A and C of the holes 850a are substantially equal, and the diameters B and D of the attack holes 852a are also the same.

Regardless of the shape of opening 19 or the dimensions of holes 850, 850a and receiving holes 852, 852a, when plug and fastener combination 810 is first inserted into opening 19, FIGS. 13, the threaded portion 814 is inserted first, as shown in FIG. Welcome hole 85
2,852a has a larger diameter than the threaded portion 814 of the plug and fastener 810 (diameters B and D in each of FIGS. 11, 13 and 15), so that the threaded portion 814 does not engage the inner walls 854, 854a of the accepting holes 852, 852a, but instead engages the holes 850, 85 when the plug and fastener 810 are engaged with the opening.
0a until it engages the inner walls 856, 856a.
Since the threaded portion 814 of the plug and fastener 810 does not engage the inner walls 854, 854a of the apertures 852, 852a, the threaded portion 814 does not create a potential helical leakage path in this portion.

As shown, the holes 850, 8 are preferably
The inner walls 856, 856a of 50a are provided so as not to be screwed in first. Accordingly, the threaded portion 814 of the plug and fastener 810 forms a thread in this portion when the threaded portion 814 engages the inner walls 856, 856a of the holes 850, 850a. In addition, holes 850,
It is also possible to thread the inner walls 856, 856a of the 850a in advance.

As shown in FIGS. 12, 14 and 16, when plug and fastener 810 are advanced further into opening 19, sealing portion 816 is substantially similar to the engagement of the sealing portion of the plug described above. Inner walls 854, 854 of attack holes 852, 852a
a. The stopper and fastener 810 are completely open 19
The threaded portion 814 of the plug and fastener 810 and the inner walls 856, 85 of the holes 850, 850a.
6a provides a first seal, the sealing portion 816 of the plug and fastener 810 and the inner walls 854, 8 of the through holes 852, 852a.
The engagement between 54a provides a second seal. The sealing rings 822 and 824 (for clarity, the reference numbers 822 and 824 are only shown in FIG. 11 only) do not constitute a plug sealing structure once in succession, so the plug and fastener 810
Sealing portion 816 of the inner wall 85 of the attack hole 852, 852a
It does not provide a helical leak path along 4,854a.

The plug and fastener combinations 910 and 1010 shown in FIGS.
10 is a non-tapered threaded portion 914,
It differs from plug and fastener 810 only in that it includes 1014. Plugs and closures 916 of fasteners 910 and 1010
And 1016 each represent a sealing portion 81 of a plug and fastener 810.
6, the sealing rings 822 and 824 of the sealing portion 816
And a pair of sealing rings having the same structure as the above. Further, similar to plugs and fasteners 810, plugs and fasteners 910
And 1010 each include a head 911 and 1011, respectively, and sealing portions 916 and 1016 include heads 910, 1010.
And the threaded portions 914, 1014.

As shown in FIGS. 17 and 18, the stopper and the fastener 910 are provided with a hole 85 whose opening is not tapered.
0a can be engaged with the opening 19 of the component P formed from the receiving hole 852a that is not tapered. In this case, as shown in FIG.
a have substantially the same diameter A and C,
The same applies to the diameters B and D of. Engagement of the plugs and fasteners 910 with the inner walls 854a, 856a of the holes is performed by the plugs and fasteners 810.
Is the same as that described in relation to. Plugs and fasteners 91
0 is the inner wall 85 using the screw portion 914 and the sealing portion 916.
4a, 856a and first and second seals are formed. This is shown in FIG.

As shown in FIGS. 19 and 20, the plug and fastener 1010 comprises two components P1 and P2 such that the first component P1 provides a hole 850b and the second component P2 provides a pit 852b. Opening 19 basically provided by
Can be engaged. Accordingly, as shown in FIG. 20, the engagement of the plug and fastener 1010 into the opening 19 is achieved by engaging the threaded portion 1014 with the component P1 and by engaging the sealing portion 1016 with the component P2. P2 becomes fixed relative to each other. Of course, the other embodiments described above may be so engaged with the two parts in much the same way to provide their fixation. As shown, the hole 850b provided in the part P1 may be pre-threaded.

The plug and fastener 11 shown in FIGS.
10 differs from the plug and fastener 810 only in that the sealing portion 1116 of the plug and fastener 1110 comprises a pair of sealing rings 1122 and 1124 whose longitudinal widths 1122a and 1122b are substantially equal. . But,
As with stoppers and fasteners 810, rings 1122, 112
Preferably, the diameters 1123 and 1125 of the fourth 4 are different and tapered toward the threaded portion 1114. In other words, the sealing ring 1124 closer to the threaded portion 1114 has a diameter 1 smaller than the diameter 1123 of the sealing ring 1122 closer to the head 1111.
It is desirable to have 125. Similarly, each ring 1
The front surfaces 1122a and 1124a of the 122 and 1124 are provided on the inner surface of the opening 19 as will be described later.
Each width 1122 to help minimize resistance between the fronts when tapping 1124 is embedded
b, it is desirable to form an angle of approximately 45 ° with 1124b (for clarity, reference numerals 1122, 11
24, 1122a, 1124a, 1122b, 1124
b, 1123, 1125 are shown only in FIG. 11).

As shown in FIGS. 21 and 22, the plug and fastener 1110 have a part P formed by a tapered hole 850 and a non-tapered facing hole 852a.
Can be engaged with the opening 19. In this case, as shown in FIG. 21, the diameter A of the hole 850 is smaller than the diameter C, while the diameters B and D of the facing hole 852a are substantially equal. In addition to this, as shown in FIGS. 23 and 24, the stopper and the fastener 1110 have a hole 8 having a tapered opening.
50 and the opening 19 of the component P formed from the tapered facing hole 852 can be engaged. in this case,
As shown in FIG. 23, diameters A and B each correspond to a corresponding diameter C
And smaller than D. In any case, the plug and fastener 111
The engagement of 0 is the same as the engagement described in connection with the plug and fastener 810. The stopper and fastener 1110 are shown in FIGS.
Preferably, as shown in FIG. 4, the threaded portion 1114 and the sealing portion 1116 are used to form the first and second seals with the inner wall of the hole 850 and the facing hole 852.

While the preferred embodiment of the invention has been illustrated and described,
It is envisioned that those skilled in the art may devise various modifications and equivalents without departing from the spirit and scope of the appended claims.

As an example, the sealing ends 16, 116, 216
Etc. can be made in various shapes. The main consideration is to achieve interference engagement with the lumen wall over the extent that the sealing end can achieve sealing. Deformation and cold forming of the lumen wall is preferred, but it is not absolutely necessary to achieve a complete seal, but rather the deformation tends to cause sufficient interference to achieve the seal. Further, while the thread forming portions 14, 114, 214, etc. are disclosed as being formed as tricuspid or trilobal according to TAPITE (R), which is well known in threaded designs, the screws 14,1 are disclosed.
Other thread forming structures for 14 etc. can also be used and are also well known in the art. The only requirement is that the thread forming portions 14, 114, etc., create the desired internal thread according to the NPTF standard. Furthermore,
As already explained, the stoppers 10, 110,. . . 710 are front sealing portions 16, 116. . . It can be used without 716, or the design of the front sealing portion can be used for NPTF standard stoppers.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view of a self-tapping pipe plug and its sealed end, showing a tapered pipe or component initially entering an opening.

2 is a side cross-sectional view similar to FIG. 1, showing the complete engagement of the self-tapping plug and the seal achieved by the sealing portion of the plug, and the threading of the plug fully inserted into the component opening; 5 shows the completion of the cold screw shape by the part.

FIG. 3 is an enlarged partial cross-sectional view of the seal formation of the closure of the plug engaging the wall of the pipe hole shown in FIG. 2, showing the expected radial stress distribution.

FIG. 4 is a side view of a threaded pipe stopper having a different sealing shape at the tip.

FIG. 4a is an enlarged partial cross-sectional view of a seal formation created in a pipe opening with a stopper corresponding to FIG. 4, showing an expected stress pattern.

FIG. 5 is a side view of a threaded pipe stopper having a different sealing shape at the tip.

FIG. 5a is an enlarged partial cross-sectional view of a seal formation created in a pipe opening with a stopper corresponding to FIG. 5, showing an expected stress pattern.

FIG. 6 is a side view of a threaded pipe stopper having a different sealing shape at the tip.

FIG. 6a is an enlarged partial cross-sectional view of a seal formation created in a pipe opening with a stopper corresponding to FIG. 6, showing an expected stress pattern.

FIG. 7 is a side view of a threaded pipe stopper having a different sealing shape at the tip.

FIG. 7a is an enlarged partial cross-sectional view of a seal formation made at the pipe opening with the stopper corresponding to FIG. 7, showing the expected stress pattern.

FIG. 8 is a side view of a threaded pipe stopper having a different sealing shape at the tip.

FIG. 8a is an enlarged partial cross-sectional view of the seal formation created at the pipe opening with the stopper corresponding to FIG. 8, showing the expected stress pattern.

FIG. 9 is a side view of a threaded pipe stopper having a different sealing shape at the tip.

FIG. 9a is an enlarged partial cross-sectional view of a seal formation made at the pipe opening with the stopper corresponding to FIG. 9, showing the expected stress pattern.

FIG. 10 is a side view of a threaded pipe stopper having a different sealing shape at the tip.

FIG. 10a is an enlarged partial cross-sectional view of a seal formation made at the pipe opening with the stopper corresponding to FIG. 10, showing the expected stress pattern.

FIG. 11 is a side cross-sectional view of a plug and fastener according to another embodiment of the present invention, showing the plug and fastener beginning to enter the opening of the component.

FIG. 12 is a side cross-sectional view showing the plug and fastener of FIG. 11 fully engaged in the opening of the component.

FIG. 13 is a side cross-sectional view of a plug and fastener according to another embodiment of the present invention, showing the plug and fastener beginning to enter the opening of the component.

FIG. 14 is a side cross-sectional view showing the plug and fastener of FIG. 13 fully engaged in the opening of the component.

FIG. 15 is a side cross-sectional view of a plug and fastener according to a different embodiment of the invention, showing the plug and fastener beginning to enter the opening of the component.

FIG. 16 is a side cross-sectional view showing the plug and fastener of FIG. 15 fully engaged in the opening of the component.

FIG. 17 is a side cross-sectional view of a plug and fastener according to another embodiment of the present invention, showing the plug and fastener beginning to enter the opening of the component.

FIG. 18 is a side cross-sectional view showing the plug and fastener of FIG. 17 fully engaged in the opening of the component.

FIG. 19 is a side cross-sectional view of a plug and fastener according to another embodiment of the present invention, showing the plug and fastener beginning to enter the opening of the component.

FIG. 20 is a side cross-sectional view showing the plug and fastener of FIG. 19 fully engaged in the opening of the component.

FIG. 21 is a side cross-sectional view of a plug and fastener according to another embodiment of the present invention, showing the plug and fastener beginning to enter the opening of the component.

FIG. 22 is a side cross-sectional view showing the plug and fastener of FIG. 21 fully engaged in the opening of the component.

FIG. 23 is a side cross-sectional view of a plug and fastener according to a different embodiment of the invention, showing the plug and fastener beginning to enter the opening of the component.

FIG. 24 is a side cross-sectional view showing the plug and fastener of FIG. 23 fully engaged in the opening of the component.

[Explanation of symbols]

First Embodiment (FIGS. 1, 2 and 3) 10 Pipe stopper 11 Head 12 Shank portion 14 Tapered thread forming portion 15 Tapered NPTF thread forming portion 16 Blocking end 17 Intermediate portion 18 Wall (lumen wall) Reference Signs List 19 opening 19a opening 20 lumen or hole 22, 24, 26 sealing ring 22a, 24a, 26a tip end surface 22b, 24b, 26b ring width 23, 25, 27 sealing deformation (ring) 30 internal screw (female screw) NPTF Female thread X1, X2, X3 Stress pattern Second embodiment (FIGS. 4 and 4a) 110 Pipe plug 114 Tapered thread forming part 115 Tapered NPTF thread forming part 116 Blocking end 117 Intermediate part 118 Wall (lumen wall) 121 Rim 123 Sealing deformation (ring) 130 Internal thread (female thread) NPTF female thread X4 Stress pattern Third implementation (FIGS. 5 and 5a) 210 Pipe plug 214 Tapered thread forming portion 216 Blocking end 218 Wall (lumen wall) 222, 224, 226, 228 Rim 222a, 228a Tip surface 223, 225, 227, 229 Sealing deformation (Ring) 230 Internal thread (female thread) NPTF female thread Fourth embodiment (FIGS. 6 and 6a) 310 Pipe plug 314 Tapered thread forming part 316 Blocking end 318 Wall (lumen wall) 322, 324, 326, 328 Rim 330 Internal thread (female thread) NPTF female thread X6 Stress pattern Fifth embodiment (FIGS. 7 and 7a) 410 Pipe plug 417 Shank portion X7 Stress pattern

 ──────────────────────────────────────────────────続 き Continued on the front page (72) William Earl. Turnmeier United States 48003 June Drive, Almont, Michigan 5051 (72) Inventor Lawrence Houston United States 38506 Cockville, Tennessee, Wilshire Drive 226

Claims (7)

[Claims] 1. In an opening (20) of a part (P),
The inner wall of the opening (18, 118, 218, 318, 4
18, 518, 618, 718, 856, 856a) for threading (14, 114, 21).
4,314,414,514,614,714,81
4,914,1014,1114) and a plug and fastener (10,110,210,310,410,
510,610,710,810,910,1010,
1110) is an unthreaded sealing portion (16, 116, 216, 316, 4) close to the threaded portion.
16,516,616,716,816,916,10
16, 1116) also enters the opening, and the unthreaded sealing portion is the inner wall (18, 11) of the opening.
8,218,318,418,518,618,71
8,854,854a) configured to provide a second seal. 2. The plug and fastener according to claim 1, wherein the plug and the fastener are heads (811, 91
1,1011,1111) and the unthreaded sealing portions (16,116,216,316,416,16)
516, 616, 716, 816, 916, 1016
1116) is the head (811, 911, 1011, 1)
111) and the threaded portions (814, 91)
The plug and fastener (810, 91) of claim 1, wherein the plug and fastener (810, 91) are disposed between the plug and the fastener.
0, 1010, 1110). 3. The non-threaded sealing part (1).
6,216,516,616,816,916,101
6,1116) is the inner wall (1) of the opening (20).
8, 218, 518, 618, 854, 854a), a plurality of longitudinally-spaced annular sealing rings (8) arranged for sealing engagement to provide said second seal. 22,24,26,222,224,226,22
8,522,524,526,622,624,62
6,628,630,632,822,824) and the sealing ring (22,24,26,222,22).
4,226,228,522,524,526,62
2,624,626,628,630,632,82
2,824) converge towards the end of said shank (12) with different dimensions in relation to each other (222).
a, 228a, 823, 825) according to claim 1, characterized in that it comprises a plug and a fastener (10, 210, 5).
10,610,810,910,1010,111
0). 4. The sealing ring (22, 24, 26, 2)
22,224,226,228,522,524,52
6,622,624,626,628,630,63
2,822,824) are different diameters (222a, 2
28a, 823, 825) having a longitudinally extending, radially uniform peripheral surface, and the sealing ring (22, 24, 26, 222, 224, 226, 22).
8,522,524,526,622,624,62
6,628,630,632,822,824) further includes a longitudinal front surface (22a, 24a, 26) extending at an angle from the respective radially uniform peripheral surface.
a, 822a, 824a, 1122a, 1124a) and the inner wall (18, 218, 5) of the opening (20).
A plug and fastener (10, 210, 510, 610, 810, 910, 1) according to claim 3, characterized in that it provides a seal against (18, 618, 854, 854a).
010, 1110). 5. Plugs and fasteners (10, 110, 210,
310, 410, 510, 610, 710, 810, 9
10, 1010, 1110) and a part (P) having an opening (20) formed therein, the method comprising providing the plug and fastener, wherein the plug and fastener are provided. A shank (12) and a driving part (11, 811, 911, 1011, 1111) formed on the shank (12).
And the inner wall of the opening (18, 118, 218, 31)
8,418,518,618,718,856,856
a) Threaded portions (14, 114, 214, 314, 414, 51) that engage with a) to provide a first seal
4,614,714,814,914,1014,11
14) and an unthreaded sealing portion (1) near the threaded portion, which also enters the opening.
6,116,216,316,416,516,61
6,716,816,916,1016,1116) wherein the unthreaded sealing portion is the inner wall (18,118,218,318,418,418,51) of the opening.
8,618,718,854,854a) configured to provide a second seal thereto; providing the component having the opening; and The plug and the fastener are engaged with the portion and the plug and the fastener are screwed into the opening.The threaded portion and the unthreaded sealing portion enter the opening and engage with the inner wall, respectively. Providing a first seal and providing a second seal. 6. The plug and fastener according to claim 1, wherein the plug and the fastener are heads (811, 91).
, 1011, 1111), wherein the method comprises the step of forming the unthreaded sealing portion (16, 116, 216, 3).
16,416,516,616,716,816,91
6,1016,1116) is the head (811,91).
1,1011,1111) and the threaded portion (8
14. The method according to claim 5, characterized in that it is arranged between (14, 914, 1014, 1114). 7. The unthreaded sealing portion (1).
6,216,516,616,816,916,101
6,1116) is the inner wall (1) of the opening (20).
8, 218, 518, 618, 854, 854a) and a plurality of longitudinally-spaced annular sealing rings configured to sealingly engage with each other to provide the second seal. (22,24,26,222,224,226,22
8,522,524,526,622,624,62
6,628,630,632,822,824) and the sealing ring (22,24,26,222,22).
4,226,228,522,524,526,62
2,624,626,628,630,632,82
2,824) differ in size in relation to each other (222) converging towards the end of the shank (12).
a, 228a, 823, 825) and the sealing ring (22, 24, 26, 222, 224, 226, 22)
8,522,524,526,622,624,62
6,628,630,632,822,824) each having a different diameter (222a, 228a, 823,82).
5) having a longitudinally extending and radially uniform peripheral surface defining the sealing ring (22, 24, 26, 22);
2,224,226,228,522,524,52
6,622,624,626,628,630,63
, 822, 824) further extend longitudinally at an angle from the respective radially uniform peripheral surface (22a, 24a, 26a, 822a, 824a,
1122a, 1124a) and the inner wall (18, 218, 518, 618, 854, 8) of the opening (20).
The method of claim 5, wherein a seal is provided for 54a).