JP2014112032A - Gas lighter and method of manufacturing gas lighter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas lighter with a simplified structure and a storage part material of appropriate fragility like an amorphous polymer.SOLUTION: The gas lighter comprises: a storage part (2) including an upper wall (5); an ejection part (6) penetrating the upper wall; and a gas distribution device 8 including an outside rigid body part (8a) which is at least partially disposed within the ejection part and opposes an inner wall of the ejection part. The gas distribution device comprises an elastic tube element (22) which is mounted within the ejection part (6). The rigid body part (8a) of the device (8) is inserted therein. The ejection part includes an end portion (34) which extends outwards against bending a stop portion (30) of the tube element under a motion of the rigid body part of the device inserted into the tube element. The bent lower portion appropriately forms annular ruggedness and moves the tube element from moving upwards with respect to the ejection part.

Description

  The present invention relates to a gas lighter and a method for assembling parts of a gas lighter.

  More specifically, the present invention relates to a gas lighter that is particularly suitable for igniting cigarettes, such a gas lighter having a top wall through which a jet penetrates and intended to contain fuel. And a gas distribution device provided with at least one tube element in the ejection part.

  To hold the tube element of the dispensing device within the spout of the reservoir, the tube element and the O-ring were provided using a coupling formation with a screw ring threaded into the threaded top of the spout. It is well known to prevent gas leakage between a jet part provided with a sealing element and is shown in FIG.

  One advantage of this type of bond is that it is possible to use a reservoir made up to amorphous poly. Amorphous polymers including SAN (styrene-acrylonitrile) and ABS (acrylonitrile-butadiene-styrene) have several advantages when manufacturing gas lighter reservoirs. They are easy to use overall, and some amorphous materials like SAN are transparent, which has the advantage that the level of liquid fuel remaining in the storage tank can be seen. However, these amorphous polymers are relatively brittle at room temperature because their elongation at the elastic limit is small, generally less than 5%. The joining of tube elements using a threaded ring, unlike a press-fit, does not substantially create a tensile stress in the wall of the jet.

International Publication No. 01/18452 Pamphlet U.S. Pat. No. 4,496,309

  However, the screw ring and the threaded threaded portion of the jetting part require the use of a relatively complex mold and lengthen the strip operation. In addition, it is relatively difficult to screw the ring into the spout when assembling the lighter, which increases the execution time in an automated manufacturing process. Furthermore, at least one sealing element is required to prevent any gas leakage around the tube element. As a result, the manufacturing cost of the gas lighter increases significantly.

  Therefore, there is a need for a gas lighter with a simplified structure, while obtaining a good seal, reducing bulk, and being safe to use, which is a non-limiting example, such as an amorphous polymer. There is a need to leave a reservoir of material that is as brittle as possible.

Embodiments of the present invention
A reservoir intended to contain fuel and provided with a top wall;
-A spout through the top wall;
A gas distribution device arranged at least partly in the ejection part,
The ejection part extends along the central axis and includes an inner wall,
The gas distribution device comprises a gas lighter having an outer rigid part facing at least a part of the inner wall,
The gas lighter further comprises an elastic tube element with at least one stop, the tube element being assembled to the ejection part, the rigid part of the gas distribution device being inserted therein, the ejection part being at least one annular Comprising a first end, the first end being centered with the central axis and the diameter of the tube element stop under the action of the rigid part of the gas distribution device inserted into the elastic tube element A gas lighter characterized in that it is bent outward in the direction and the first end is directed toward the inside of the reservoir.

  Due to the advantages of this procedure, the upper wall of the reservoir is provided with a relatively smooth wall (no threading in the jet) and is easier to manufacture. Furthermore, the coupling of the gas distribution device to the reservoir is easier. This is because all that is required is that the tube element is fixed when the gas distribution device is inserted into a fixed position after the elastic tube element is placed in the spout.

  According to another feature, the first end is annular.

  According to another feature, it is directed towards the inside of the reservoir. Thus, the tube element may be inserted from the top, preventing upward movement of this tube element.

  According to another feature, the first end is the inner end of the ejection portion. This procedure facilitates the molding operation on the upper wall.

  According to another feature, the ejection part comprises at least one second end facing away from the first end and the elastic tube element engages at least one second end. It has a stop.

  According to another feature, the second end faces the first end, the surface including the first end and the surface including the second end form a recess in the inner wall of the ejection portion, and the tube The stop of the element is bent under the action of the rigid part of the gas distribution device inserted in the elastic tube element. In such embodiments, the bent portion is radially expanded in the top wall and the elastic tube element can be of a shorter length to save material.

According to another feature, the stop forms an annular ridge.

  According to another characteristic, the stop of the tube element projects inwardly when not assembled and the outer rigid part is cylindrical. With such treatment, the gas distribution device may be of a standard configuration with a cylindrical shape.

  According to another feature, the outer rigid part comprises a rigid annular projection. One advantage of this procedure is that a suitable fixation position is obtained with a smooth bend in the stop of the elastic tube element.

  According to another characteristic, the elastic tube element comprises a cylindrical part facing the inner wall of the ejection part, the cylindrical part having a constant thickness. The elastic tube element is thereby easily manufactured.

According to another characteristic, the ejection part has a cylindrical shape with an inner diameter d1, the outer rigid part of the gas distribution device has a cylindrical shape with an outer diameter d2, and the stop of the elastic tube element gives a thickness T. The relational expression 2 × T + d2> d1
Meet. Therefore, the stop portion is pressed radially outward by the outer rigid body portion, and this stop portion is penetrated by the bending space or the concave portion, and the space is radially separated from the overall cylindrical shape of the ejection portion. .

  According to another characteristic, the stop of the elastic tube element is in airtight contact with the spout. This prevents fuel from leaking without additional O-rings.

  According to another characteristic, the elastic tube element is a one-piece part made of a synthetic elastomer, preferably a thermoplastic polyester elastomer. This special material has gas tightness, sufficient strength (like plastic), good elasticity (like rubber), possibility of injection molding, tear, bending crack growth, creep and wear With strong resistance. These properties and size matching of the elastic tube element prevent vertical movement of the gas distribution device.

  It is also an object of the present invention to provide an easy assembly of the gas distribution assembly into the jet of the gas lighter reservoir.

Therefore, a method of assembling the gas lighter is further proposed by the present invention, and the method is as follows:
A reservoir intended to contain fuel and provided with a top wall;
-A spout through the top wall;
A gas distribution device arranged at least partly in the ejection part,
The ejection portion includes an inner wall extending along the central axis and forming at least one annular first end whose center coincides with the central axis, and the annular first end is directed toward the inside of the storage portion. Is directed,
In a method for assembling a gas lighter with an outer rigid part facing at least a part of an inner wall, the gas distribution device comprises: inserting an elastic tube element in the ejection part; ) Inserting the gas distribution device in the inside, and then bending the stop of the tube element relative to the first end under the action of the rigid body of the gas distribution device;
Fixing the tube element in the spout via a bent stop;
Is included.

  Other features and advantages will become apparent to those skilled in the art from the following description, given with reference to the accompanying drawings and using a non-limiting example.

It is the figure which showed the simplified vertical cross section of 1st Embodiment by this invention, and is the state before the assembly | attachment of a gas distribution device. It is the figure which showed the vertical cross section of the upper part of the gas lighter of the assembled state by 1st Embodiment. It is the figure which showed the simplified vertical cross section of 2nd Embodiment by this invention, and is the state before the assembly | attachment of a gas distribution device. It is the figure which showed the vertical cross section of the upper part of the gas lighter of the assembled state by 2nd Embodiment. It is the figure which showed the simplified vertical cross section of 3rd Embodiment by this invention, and is the state before the assembly | attachment of a gas distribution device. It is the figure which showed the simplified vertical cross section of 4th Embodiment by this invention, and is the state before the assembly | attachment of a gas distribution device.

  In the various figures, the same reference signs are used to designate the same or similar elements.

  For the purpose of promoting an understanding of the present invention, reference is made to the four exemplary and non-limiting embodiments shown in FIGS. As shown in FIGS. 2 and 4, the gas lighter 1 comprises a reservoir 2, which is intended to contain a pressurized and partially liquid fuel, such as isobutane.

  As shown in FIGS. 2 and 4, the reservoir 2 may be in the form of a bowl 3, which is preferably U-shaped and has a bottom wall, not shown in FIG. An annular side wall extending upward from the bottom wall to the upper end 4 is provided.

  The upper end 4 is closed in the illustrated embodiment by the top wall 5 and can be any method known to those skilled in the art including, but not limited to, gluing, gluing, welding, friction bonding, press fitting. It may be a separate part fixed to the bowl 3 by. Alternatively, the top wall 5 may be manufactured as an integral part of the bowl 3.

  The reservoir 2 is preferably made from at least one rigid amorphous polymer material, which contains, for example, ABS (acrylonitrile-butadiene-styrene), SAN (styrene-acrylonitrile) and the like. Therefore, the storage unit can be injection molded. Alternatively, according to an embodiment, the bowl 3 is manufactured from SAN, while the upper wall 5 is manufactured from ABS, and vice versa, eg ultrasonic sealing, bonding, ultrasonic welding, gluing These materials are joined together in a well-known method.

  The advantage of such an amorphous polymer is that it is relatively inexpensive and easy to use, process, manufacture and form parts. In addition, amorphous polymers such as SAN may be transparent, allowing the user to see the level of liquid fuel remaining in the reservoir with respect to the gas lighter.

  Other amorphous type polymers may be used, and their mechanical and chemical properties are provided that are compatible for use in gas lighters.

  The upper wall 5 of the storage part further comprises a squirting part 6, which in the illustrated embodiment extends along the vertical axis Z and may advantageously be an annularly symmetric cylindrical shape.

  Generally speaking, the jet 6 is capable of receiving a gas distribution device 8 which is actuated by an operating device 9 carried by a lighter head 10 on the reservoir 2. In the illustrated embodiment, the head 10 is preferably held against the upper wall 5 of the reservoir by a catch 11 (ie, stud) on the head 10, and the catch 11 is molded into the upper wall 5 of the reservoir 2. Cooperate with the complementary catch 12 made by snap fit or clipping.

  The head 10 also forms a support part for attaching the ignition device 14 and the windshield 13, and the windshield 13 forms a screen or a shield against wind or ventilation.

  The ignition device 14 is generally known in the art and includes, for example, a spark wheel 15 and a flint 16, which is received by a spring 17 received in a circular cavity 18 within the head 12. It is hold | maintained so that it may be pressed with respect to. A complementary cavity 19 is formed in the upper wall 5 of the reservoir 2 and corresponds to the cavity 18 of the head 12. However, it is of course possible to use other types of ignition devices such as piezoelectric devices.

  As further shown in FIGS. 2 and 4, the dispensing device 8 is connected to the tube element 22 and may include an outer tube 23 formed of metal or a suitable alloy. The lower part 24 of the outer tube 23 is preferably equipped with an adjusting device for adjusting the gas flow rate, which may be for example a microporous membrane 25. The microporous membrane 25 preferably includes a unidirectionally stretched polypropylene film, and has small and narrow holes as described in Patent Document 2. The microporous membrane 25 is suitably held with respect to the inner shoulder 23a of the outer tube 23, and the shoulder 23a is formed in the vicinity of the lower end 24 of the outer tube 23. Therefore, the microporous membrane 25 is the center of the shoulder 23a. It is possible to cover the orifice 26 formed in the above. The microporous membrane 25 is preferably pressed against the bottom surface of the shoulder 23a by a rigid ring 27, and the rigid ring 27 is maintained at the bottom of the outer tube 23 by crimping the lower end 24 of the outer tube 23 itself. ing.

  The distribution device 8 preferably includes a valve 40 with a gas outlet duct 41 opening in the vicinity of the ignition device 14. The duct 41 preferably includes a shutter 42 disposed below the dispensing device 8. Preferably, the shutter 42 is made of an elastomer material and is designed to close the gas passage orifice 26 as the duct 41 moves along the longitudinal axis Z of the tube element 22. Preferably, the duct 41 also includes a slot 43 formed in the vicinity of the shutter 42 to provide communication with the interior of the outer tube 23.

  Further, the operation device 9 includes a fork 45 assembled so as to be inclined with respect to a pin fixed to the head 12. The fork 45 includes a first end 46 and a second end 49. The first end portion 46 cooperates with the lower shoulder 47 and the upper shoulder 48 formed at the upper end of the duct 41 lifted from the outer tube 23, so that when the user presses the second end portion 49 of the fork 45. , Allowing the gas distribution device 8 to be lifted. When the user presses the second end 49 of the fork 45, the valve 40 is opened and gas is released from the storage unit 2.

  Preferably, a compression spring 50 is arranged between the lower side of the second end 49 of the fork 45 and the upper wall 5 of the reservoir 2, thereby urging the fork 45 upward and no lighter is used. Sometimes the valve is biased into the closed position.

  In the first preferred embodiment shown in FIGS. 1 and 2, the dispensing device 8 is connected to an elastic tube element 22. This tube element 22 is preferably cylindrical in shape and is symmetrical in an annular shape for engaging the upper wall 5 of the storage part 2 in the ejection part 6. The tube element 22 is made of an elastic plastic material that is not deteriorated by gas. Preferably, the tube element 22 is an elastic single piece formed from a thermoplastic polyester elastomer. For example, an elastomer named Hytrel® is a suitable choice. Alternatively, the tube element 22 is formed from another polymer with similar properties of particularly high strength and appropriate flexibility. As can be seen in particular in FIGS. 1 and 5, the tube element 22 may first be introduced into the jet 6 and then the dispensing device 8 may be inserted. The dispensing device 8 includes an outer tube 23 formed of metal or a suitable alloy. The elastic material of the tube element 22 provides sufficient flexibility to allow the outer tube 23 to fit smoothly within the tube element 22.

  As shown in FIG. 1, the tube element 22 comprises at least three parts, which are a first end head 28 suitably disposed on the ejection part 6, and in the ejection part 6. A fully inserted intermediate portion 29 and a second end stop 30. The stop 30 is designed to be secured by the outer tube 23 of the dispensing device 8. The intermediate part 29 and the stop part (lower part) 30 form a flexible insertion part, and the part preferably has an initial outer diameter substantially coinciding with the inner diameter of the ejection part. The flexible insertion part is preferably longer than the effective length of the ejection part 6. The head 28 may be considered as an addition.

  An outer peripheral rim 31 formed on the head 28 is adjacent to the annular upper end 32 of the ejection portion 6. The outer peripheral rim 31 is formed by a flange ring or similar holding element and prevents downward movement of the tube element 22 relative to the jet 6.

  In order to prevent upward movement of the tube element 22, an annular projection 33 is preferably provided on the inner surface of the stop 30 of the tube element 22. In other words, the stop part 30 protrudes inward.

  As shown in FIGS. 1 and 2, the tube element 22 protrudes on both sides of the ejection part 6. The annular protrusion 33 is formed on the inner surface of the stop portion 30, and the height thereof is a position where the tube element 22 protrudes into the storage portion 2 below the upper wall 5.

  The intermediate portion 29 has a cylindrical shape, and the thickness thereof is thinner than the thickness T of the stop portion 30 provided on the annular protrusion 33. As shown in FIG. 1, the tube element 22 is first mounted in the jet 6 and then the annular projection 33 moves radially outward when the dispensing device 8 is mounted in the tube element 22. . In the assembled state shown in FIG. 2, the dispensing device 8 provides an external rigid part 8 a facing the inner wall of the ejection part 6. The outer rigid body portion 8a may be formed integrally or non-integrally with the outer tube 23, and in particular may be in contact with the annular protrusion 33.

  As shown in FIG. 2, the outer tube 23 presses against the stop 30 in the area where the excess thickness is provided, so that it exceeds one rim or end 34 of the jet 6. The stop 30 is bent in the radial direction. In other words, when the dispensing device 8 is assembled inside the tube element 22, the dispensing device 8 causes the stop 30 to expand, thereby securing the tube element 22 and preventing any upward movement thereof. .

  The bent stop 30 is in intimate contact with the outer tube 23 and the annular end 34 and is adjacent to the lower end of the ejection portion 6. Sealing and fixing of the outer tube 23 in the tube element 22 is obtained via a stop 30. The dispensing device 8 is also in contact with the head 28 and the intermediate part 29 at least between the lower opening 35 and the upper opening 36 of the tube element 22.

  In an alternative exemplary embodiment, as seen in FIG. 5, the annular protrusion 33 forms the inner surface of the intermediate portion 29, the height of which is the ejection portion 6 having an inner recess 37. Position. In such an embodiment, the stop 30 is an intermediate part of the tube element 22, and a part of the stop 30 protrudes in the radial direction and penetrates into the inner recess 37. The sealing and fixing of the outer tube 23 in the tube element 22 is also obtained in this case via an annular projection 33. Two or more protrusions may be provided at different heights of the stop 30, and may be provided corresponding to the inner recess 37 and / or the outer recess of the ejection part 6. Since the holding friction functions as a whole by the annular protrusion 33 fixed between the two end portions (34, 37a) facing each other, the head 28 is suppressed. The first end 34 is directed toward the interior of the reservoir 2, while the second end 37a is directed in the opposite direction.

  With reference to FIGS. 3 and 4 related to another embodiment, an annular at least one protrusion 38 is formed in the outer tube 23 at the height of the lower portion 24. The annular protrusion 38 may or may not be continuous. Thereby, the dispensing device 8 shows an increase in its outer diameter at a position protruding into the reservoir below the upper wall 5. The intermediate part 29 and the stop part 30 of the tube element 22 preferably have the same thickness T. In this case, the excess thickness is provided by the annular protrusion 38.

  As shown in particular in FIG. 4, the tube element 22 may first be introduced into the jet 6 and then the dispensing device 8 may be inserted. When the dispensing device 8 is assembled into the tube element 22, the movement of the annular projection 38 causes the stop 30 of the tube element 22 to bend. As a result, in the state in which the distribution device 8 is assembled, the stop portion 30 expands radially outward with respect to the intermediate portion 29 to form an annular ridge 39. The annular ridge 39 prevents the tube element 22 from moving upward with respect to the ejection portion 6. Furthermore, such bending results in the stop 30 of the tube element 22 being in airtight contact with the jet 6.

  In an alternative exemplary embodiment as shown in FIG. 6, the annular protrusion 38 may be formed in the middle of the outer tube 23, the height of which is the position where the jet 6 has a recess 37. It may be. Since the holding friction is functioning as a whole by the annular ridge formed in the intermediate part 29 under the movement of the annular projection 38, the head 28 is suppressed. This annular ridge with a curved profile is fixed between the first end 34 and the second end 37a.

  The bent part of the tube element 22 and additionally the head 28 provide a radial projection, which fixes the tube element 22 together with the upper wall 5 of the storage part 2 in the ejection part 6. Thus, the tube element 22 and the upper wall 5 are assembled to form a lighter without screwing. All that is required for the tube element 22 to engage the upper wall of the reservoir 2 is introduced into the jet 6 between the upper wall 5 and the dispensing device 8 is assembled. Since it is partially bent, it is particularly easy to assemble. Furthermore, since the tube element 22 and the upper wall 5 of the storage part are not equipped with screws, they can be produced using molding which can increase the production rate.

The ejection part 6 may be provided with a simple cylindrical shape having an inner diameter d1. The outer tube 23 has a maximum outer diameter d2 that is smaller than the diameter d1, and may be a standard cylindrical part. Advantageously, the maximum thickness T of the stop 30 of the tube element 22 is:
2 × T + d2> d1
Satisfy the relationship.

  In the illustrated non-limiting embodiment, a locking mechanism is provided via the head 28 and the bend of the tube element 22. A gas apparatus of a suitable brittle reservoir material such as a simple structure and an amorphous polymer, and in particular a gas lighter 1, is obtained in this way.

  The invention has been described with reference to the preferred embodiments. However, these embodiments are merely illustrative, and the present invention is not limited thereto. Other variations and modifications can be readily formed within the scope of the invention as defined by the appended claims, and thus the invention is intended to be limited by the following claims. It will be understood by those skilled in the art that it only does. For example, the present invention may be implemented in any gas apparatus in which the distribution device 8 and the storage unit 2 are provided.

DESCRIPTION OF SYMBOLS 1 ... Gas lighter 2 ... Storage part 3 ... Bowl 4 ... Upper end 5 ... Upper wall 6 ... Jetting part 8 ... Gas distribution device 9 ... Operation device 10 ... · Head 13 · · · Windshield 14 · · · Ignition device 15 · · · Spark foil 16 · · · Flint 22 · · · Tube element 23 · · · Outer tube 25 · · · Microporous membrane 26 · · · Orifice 27 ··· Rigid ring 29 ··· Intermediate portion 30 ··· Stop portion 37 ··· Recess portion 38 ··· Ring protrusion 39 ··· Round protrusion 40 ··· Valve 41 ··· Gas outflow duct 42 ··· Shutter 43 ... Slot 45 ... Fork 47 ... Lower shoulder 48 ... Upper shoulder

Claims (11)

A reservoir (2) intended to contain fuel and provided with an upper wall (5);
-An ejection part (6) penetrating the upper wall (5);
A gas distribution device (8) arranged at least partly in the spout (6),
The ejection portion (6) extends along the central axis (Z) and includes an inner wall,
In the gas lighter (1), the gas distribution device (8) comprises an outer rigid part (8a) facing at least a part of the inner wall,
The gas lighter (1) further comprises an elastic tube element (22) with at least one stop (30), the tube element (22) being assembled to the jet (6), the gas distribution device The rigid body portion (8a) of (8) is inserted therein, and the ejection portion (6) includes at least one annular first end portion (34), and the first end portion (34) is the center. The rigid body of the gas distribution device (8), centered on the axis (Z) and having the stop (30) of the tube element (22) inserted into the elastic tube element (22) Bent radially outward under the action of the part (8a), the first end (34) being directed towards the inside of the reservoir (2),
The stop portion (30) of the elastic tube element (22) is in airtight contact with the annular first end portion (34) of the ejection portion (6), and a seal is secured without an O-ring seal. A gas lighter characterized by   The gas lighter according to claim 1, wherein the first end portion (34) is an inner end of the ejection portion (6).   The squirting part (6) comprises at least one second end (31, 37a) facing away from the first end (34), the elastic tube element (22) being the second Gas lighter according to claim 1 or 2, characterized in that it comprises at least one stop (28, 30) engaged with the end (31, 37a).   The second end portion (37a) faces the first end portion (34), and the surface including the first end portion (34) and the surface including the second end portion (37a) are the ejection portion. A recess is formed in the inner wall of (6), and said stop (30) of said tube element (22) is said rigid body part of said gas distribution device (8) inserted into said elastic tube element (22) ( Gas lighter according to claim 3, characterized in that it is bent under the action of 8a).   The gas lighter according to any one of claims 1 to 4, wherein the stop (30) forms an annular ridge.   The said stop part (30) of the said tube element (22) protrudes inward in the state which is not assembled | attached, The said outer rigid body part (8a) is cylindrical, The cylindrical shape of Claims 1-3 or 5 characterized by the above-mentioned. The gas lighter as described in any one of Claims.   The gas lighter according to any one of claims 1 to 5, wherein the outer rigid portion (8a) includes a rigid annular protrusion (38).   The elastic tube element (22) includes a cylindrical portion (29, 30) facing the inner wall of the ejection portion (6), and the cylindrical portion (29, 30) has a certain thickness. The gas lighter according to claim 7. The ejection portion (6) has a cylindrical shape showing an inner diameter d1, and the outer rigid body portion (8a) of the gas distribution device (8) has a cylindrical shape showing an outer diameter d2, and the elastic tube element (22). The stop (30) is given a thickness T and the relation 2 × T + d2> d1
The gas lighter according to any one of claims 1 to 8, wherein:   Gas lighter according to any one of the preceding claims, characterized in that the elastic tube element (22) is a single piece made of synthetic elastomer or thermoplastic polyester elastomer. A reservoir (2) intended to contain fuel and provided with an upper wall (5);
-An ejection part (6) penetrating the upper wall (5);
A gas distribution device (8) arranged at least partly in the spout (6),
The ejection part (6) includes an inner wall extending along a central axis (Z) and forming at least one annular first end (34) whose center coincides with the central axis (Z), The first end (34) is directed towards the inside of the reservoir (2);
In the method for assembling a gas lighter (1) comprising an outer rigid part (8a) facing at least part of the inner wall, the gas distribution device (8)-an elastic tube element in the ejection part (6) Inserting (22), then: inserting the gas distribution device (8) into the tube element (22) in the ejection part (6), and then:-the gas distribution device (8) Bending the stop (30) of the tube element (22) with respect to the first end (34) under the action of the rigid part (8a) of:
Fixing the tube element (22) in the spout (6) via the bent stop (30), the stop (30) of the elastic tube element (22) Providing a hermetic contact between the spout and the annular first end (34) of the spout (6) to ensure a seal without an O-ring seal. And how to.