JP2006005988A - Sealing structure of coupling for screwless conduit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling for a screwless conduit excellent in waterproof effect in use. <P>SOLUTION: The thickness of waterproof end packing (11) which is fitted and integrated into openings at both ends of a coupling body (1) is so made that it becomes thickest at a section which is positioned to correspond to the press point (N) of the conduit (7) by a press bolt (8) and it becomes thinner gradually as it goes to the thinnest section which is positioned to correspond to the antipodal point (S) of the press point (N) from the thickest section. Thereby, the internal peripheral face of the end packing (11) is made into a circular form which is decentered by a certain quantity (E) from the internal peripheral face of the coupling body (1), and an elastic lip (11c) juts out by a certain length (Y1) from the eccentric internal peripheral face. It is set so that the pressure contact state of the elastic lip (11c) with respect to its external periphery may be kept roughly equal all over the circumference at angles of 360° even if the external peripheral face of the conduit (7) is pressed by the press bolt (8). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sealing structure for various screwless couplings used on a highway, a rooftop of a building, a chemical factory, a water supply / sewerage facility, and the like, which are used in an exposed state outdoors or buried in the ground.

The present applicant has previously proposed Japanese Patent No. 3509805 regarding the coupling of this kind of threadless electric pipe (steel pipe), and was able to achieve considerable results by commercializing it.
Japanese Patent No. 3509805 Japanese Patent No. 3509802 No. 5-10495

  However, as a result of earnest research after that, it was found that the above-mentioned Japanese Patent No. 3509805 still has the following problems.

  That is, although the details are not shown in the configuration of this known invention, in practice, the cup for inserting a screwless conduit (polyethylene-lined unthreaded steel tube) (14) into the cylindrical coupling body (10) is used. A considerable gap (usually about 2.5 to 3.0 mm) is secured between the inner peripheral surface of the ring body (10) and the outer peripheral surface of the screwless conduit (14).

  In this respect, from the waterproof rubber packing (20) that is attached and integrated to both ends of the opening of the coupling body (10), the elastic lip (20c) that is crimped to the outer peripheral surface of the threadless conduit (14) is inward. However, the rubber packing (20) itself, as a whole including the elastic lip (20c), is in the form of a perfect circular ring concentric with the coupling body (10).

  Therefore, when the unthreaded conduit (14) is inserted into the coupling body (10) and then pressed from one direction by screwing the presser bolt (17), the unthreaded conduit (14) is connected to the coupling body ( 10) and the rubber packing (20), and the outer peripheral surface of the eccentric threadless conduit (14) is the lower side of the rubber packing (20) on the lower side of FIG. While further compressing the elastic lip (20c) from the initial pushing-down deformation state, the elastic lip (20c) is inscribed in the inner peripheral surface of the coupling body (10), while the outer peripheral surface of the unthreaded conduit (14) is the upper side of FIG. At the pressing contact side of the presser bolt, the elastic lip (20c) of the rubber packing (20) is far from the inner peripheral surface of the coupling body (10), and the elastic lip (20c) of the rubber packing (20) is pushed down from the initial deformation state. Conversely it is stretched in a direction to restore.

  As a result, as a coupling used under such a state, there is a possibility that water may enter from the upper part of FIG. 6 in which the elastic lip (20c) of the rubber packing (20) has been extended. Yes, the outer peripheral surface of the unthreaded conduit (14) cannot be maintained in a uniform, stable and reliable waterproof pressure bonding state at 360 degrees.

  As a preventive measure, for example, if the elastic lip (20c) of the rubber packing (20) is extended long inward, the insertion resistance of the screwless conduit (14) to the coupling body (10) becomes excessive, and the insertion work Inhibits sex.

  Such a problem occurs not only in the above-mentioned Patent No. 3509805 but also in the configuration of Patent No. 3509802 cited as Patent Document 2 in exactly the same manner.

  The present invention aims to further improve such a problem, and in order to achieve the object, in claim 1, a coupling body shaped in a substantially cylindrical shape corresponding to a threadless conduit,

  As a pair of two scattered in a longitudinally symmetrical arrangement on the body of the coupling body, a pressure bolt for a conduit tube implanted and screwed so as to be freely advanced and retracted along the centripetal direction,

  Also provided with a waterproof end packing in the form of a pair of front and rear circular rings fitted and integrated to both ends of the opening of the coupling body,

  The unthreaded conduit cup for pressing the outer peripheral surface of the unthreaded conduit tube inserted into the coupling body by the screwing operation of the pressing bolt while pushing down the elastic lip projecting from the inner peripheral surface of the end packing. In the ring,

  The thickness of the end packing is maximized at the part corresponding to the pressing contact of the unthreaded conduit with the pressing bolt, and gradually becomes thinner from the maximum part to the minimum part corresponding to the counter electrode point of the pressing contact. By doing so, the inner peripheral surface of the end packing is formed into a circular shape eccentric from the inner peripheral surface of the coupling body by a certain amount,

  Even if the elastic lip is extended by a certain length from the eccentric inner peripheral surface of the end packing, and the outer peripheral surface of the unthreaded conduit is pressed by a pressing bolt, the pressure-bonded state of the elastic lip to the outer peripheral surface is 360 degrees. It is characterized in that it is set so as to be maintained substantially evenly.

  Further, in claim 2, a coupling body shaped in a substantially cylindrical shape corresponding to a threadless conduit,

  Press for the conduit that is implanted and screwed into the body of the coupling body in a symmetric arrangement and a symmetrical arrangement that maintains a constant crossing angle. Bolts,

  Also provided with a waterproof end packing in the form of a pair of front and rear circular rings fitted and integrated to both ends of the opening of the coupling body,

  The unthreaded conduit cup for pressing the outer peripheral surface of the unthreaded conduit tube inserted into the coupling body by the screwing operation of the pressing bolt while pushing down the elastic lip projecting from the inner peripheral surface of the end packing. In the ring,

  The thickness of the end packing is on the bisector of the crossing angle of the pressing bolt, and becomes the maximum at the portion corresponding to the side where the pressing contact of the unthreaded conduit with the pressing bolt exists, the maximum The inner circumferential surface of the end packing is decentered by a certain amount from the inner circumferential surface of the coupling body by gradually thinning the portion from the portion to the minimum portion corresponding to the counter electrode point on the bisector. Shape it into a circle,

  Even if the elastic lip is extended by a certain length from the eccentric inner peripheral surface of the end packing, and the outer peripheral surface of the unthreaded conduit is pressed by a pressing bolt, the pressure-bonded state of the elastic lip to the outer peripheral surface is 360 degrees. It is characterized in that it is set so as to be maintained substantially evenly.

  Further, in claim 3 subordinate to claim 1 or claim 2, a mark indicating the maximum or minimum thickness of the end packing is provided on the surface of the end packing, while the alignment mark with the mark is provided on the coupling body. It is characterized in that the end packing is set in an accurately aligned state to both ends of the opening of the coupling body by being applied to the body portion so that the fitting operation can be performed.

  Similarly, in claim 4 subordinate to claim 1 or claim 2, one of the conduit partitioning center partitioning screws is implanted and screwed into the center of the body of the coupling body so as to be able to advance and retract.

  The elastic lip of the end packing that is crimped to the outer peripheral surface of the unthreaded conduit projects from the inlet end of the end packing at a substantially right angle inward, and the conduit seat is also facing inward from the back end of the end packing. Overhang at almost right angle

  The relationship is set so that the elastic lip pushed down by the unthreaded conduit tube escapes into the concave circumferential groove that is recessed relative to the overhang.

  In claim 5 dependent on claim 1 or claim 2, the thickness is gradually reduced from the largest portion corresponding to that of the waterproof end packing to the smallest portion, so that the inner thickness of the coupling body is also reduced. A waterproof center packing formed in a circular shape eccentric from the peripheral surface by a certain amount is fitted and integrated into the intermediate part of the coupling body.

  From the eccentric inner peripheral surface of the center packing, projecting the wedge-shaped section lip for the conduit tube into an acute-angled posture state inclined to either the front or rear,

  When an unthreaded conduit is inserted into the coupling body from a direction that adapts to the inclined posture state of the partition lip, the partition lip acts as a lie down so that the unthreaded conduit is relatively fed to the coupling body. While allowing piping

  When the unthreaded conduit is inserted into the coupling body from the direction against the inclined posture of the partition lip, the partition lip strikes against the cut end surface of the unthreaded conduit, and the conduit lip is raised. It is characterized by being set so that it cannot be penetrated.

  Further, in claim 6 dependent on claim 1 or claim 2, the elastic lip of the end packing which is crimped to the outer peripheral surface of the unthreaded conduit is a short projecting inward from the inlet portion of the end packing at a substantially right angle. As a parallel pair of a thick first elastic lip and a relatively long thin second elastic lip that also projects from the back of the endpacking at a substantially right angle inward,

  The pair of first and second elastic lips is set to be superimposed on the outer peripheral surface of the unthreaded conduit.

  In the configuration of claim 1, the thickness of the end packing that waterproofs both ends of the opening of the coupling main body is maximized at the portion corresponding to the pressing contact of the screwless conduit by the pressing bolt, and the pressing contact from the maximum portion. The thickness of the end packing is gradually reduced to the minimum position corresponding to the counter electrode point, and the inner circumferential surface of the end packing forms a circular shape eccentric from the inner circumferential surface of the coupling body by a certain amount. Since the elastic lip is projected from the inner peripheral surface by a uniform constant length of 360 degrees, even if the outer peripheral surface of the conduit is pressed from one direction by the screwing operation of the pressing bolt, the outer peripheral surface The pressure-bonding force of the elastic lip with respect to the cable will not be weakened after a while, and the outer peripheral surface of the conduit can still be maintained in a uniform pressure-bonded state at 360 degrees. So that the obtained a.

  Further, in the configuration of the second aspect, even if there are a total of four pressing bolts for conduit pipes and are distributed in a symmetrical arrangement that maintains a constant crossing angle between the left and right pairs, the wall thickness of the waterproof end packing is still the same. Is on the bisector of the crossing angle and becomes the maximum at the portion corresponding to the side where the pressing contact of the conduit tube by the pressing bolt exists, and the counter electrode point on the bisector from the maximum portion By gradually thinning toward the minimum position corresponding to the corresponding position, the inner peripheral surface of the end packing forms a circular shape eccentric from the inner peripheral surface of the coupling body by a certain amount. The above-mentioned effect of claim 1 can be achieved in exactly the same way because it is projected inward by a uniform constant length in degrees.

  If the structure of claim 3 is adopted, the waterproof end which is eccentric from the inner peripheral surface of the coupling body by a certain amount in any of the threaded conduit couplings according to claims 1 and 2 above. The packing can be quickly fitted and integrated to both ends of the opening of the coupling main body without error, and the assembly work can be performed conveniently and effectively.

  If the structure of Claim 4 is employ | adopted, the elastic lip of the waterproof end packing pushed down to the state bent greatly by about 90 degree | times can be smoothly escaped and polymerized inside the concave circumference groove | channel, and the pushing-down deformation effect | action Due to the restoring repulsive force and the receptacle for the conduit, there is an effect that the conduit can be stably handled and fixed.

  If the structure of claim 5 is adopted, the cut end surfaces of the two conduits that have been sequentially sent out from the unthreaded conduit connector (not shown) of the relay box can be accurately connected to each other at the final point of the piping work. It is possible to match and connect to the state conveniently.

  Furthermore, if the structure of Claim 6 is employ | adopted, the thick 1st elastic lip of the inlet_port | entrance part in a waterproof end packing will crimp on the outer peripheral surface of a screwless conduit with a comparatively strong restoring repulsion force. At the same time, the long second elastic lip arranged in parallel with the back part presses the outer peripheral surface of the conduit tube with a relatively large frictional area, so that both ends of the opening of the coupling body can be sealed in a superimposed manner. The waterproof effect during use is further improved.

  Hereinafter, a specific configuration of the present invention will be described in detail with reference to the drawings. First, FIGS. 1 to 12 show a coupling for a screwless conduit according to a first embodiment of the present invention. The numerical values of dimensions to be described later are merely examples for coupling of product number # 22 for the convenience of understanding the ratio (correlation between constituent members).

  (1) is a cylindrical coupling body having a fixed length (L) (about 76 mm), thickness (T) (about 1.8 mm) and inner diameter (d1) (about 29.2 mm) Consists of a galvanized steel pipe, but a certain length of both ends of the opening is plastically processed into a pair of front and rear end flanges (2) that are large in diameter by a certain amount (H) (about 2 mm). Overhang formed in the state.

  (3) is a screw for receiving a pressing bolt, which is formed as a pair of two scattered in a symmetric arrangement in the front-rear direction and cut outward from the body of the coupling body (1) by a certain height as shown in FIG. The mouthpiece (4) is a screw hole for receiving a center partitioning screw, which is also formed in the body of the coupling body (1) as one piece interposed between the pair of intermediate portions.

  Reference numeral (5) denotes a center partitioning screw for receiving a conduit tube, which is implanted into the screw hole (4) through a waterproof O-ring (6) so as to be able to advance and retreat, and is screwed therein. The cut end surface of the screwless conduit (7) is received by the screw shaft portion (5a) projecting from the circular inner peripheral surface. The outer diameter (D) of the unthreaded conduit (7) is about 26.5 mm.

  Therefore, if the center partition screw (5) is screwed and the screw shaft portion (5a) is immersed from the inner peripheral surface of the coupling body (1), an unthreaded electric wire is connected to the coupling body (1). Relative feed piping can be performed so as to penetrate the tube (7). (5b) is a conical large-diameter head in the center partition screw (5), and it is needless to say that it has a locking groove (5c) for a turning operation tool.

  (8) is a conduit pressing bolt that is implanted and screwed in the centripetal direction of the coupling main body (1) from the pressing bolt receiving screw cap tube (3) so as to be freely advanced and retracted. By operating, the outer peripheral surface of the threadless conduit (7) can be pressed and fixed in a retaining state.

  In addition, each of the pressing bolts (8) is made of a metal that does not rust, such as stainless steel, and the screw shaft (8a) has a waterproof film (9) such as acrylic resin or fluorine resin as shown in FIG. In addition to being coated (welded), the tip of the screw shaft portion (8a) serves as a conical claw claw (8b), and exhibits excellent pull-out resistance strength of the screwless conduit (7), It can also function as a ground. (8c) is a hexagonal large-diameter head in the pressing bolt (8), and (10) is a spring washer inserted and set in the pressing bolt (8).

  Further, (11) is a pair of front and rear end packings that waterproofs both ends of the opening of the coupling body (1). As is apparent from the enlarged views extracted in FIGS. 6 to 10, the end flange (2) A circular ring-shaped cover head (11a) that can be locked to the end face of the end flange (2) and an outer diameter that is substantially equal to the inner diameter of the end flange (2). As a basic L-shaped cross section in which a circular ring-shaped insertion leg membrane (11b) fitted to the inner peripheral surface of the end flange (2) is continuous, rebound resilience, weather resistance, tear resistance It is integrally molded from ethylene propylene rubber (EPM), which is abundant. The overall depth (W) of the end flange (11) is about 8 mm.

  Such a waterproof end packing (11) is fitted into the end flange (2) having a large diameter of the coupling body (1) from the front and rear directions, and the inserted leg membrane (11b) has an adhesive not shown in the figure. To the inner peripheral surface of the end flange (2), and the back surface of the remaining cover head (11a) is also crowned to the end surface of the end flange (2) by an unillustrated adhesive. There will be no risk of accidental peeling.

  In the case of the present invention, the thickness of the waterproof end packing (11) having the circular ring shape is not entirely uniform at 360 degrees, and is intentionally changed as follows.

  That is, the thickness of the end packing (11) corresponds to the pressing contact (N) of the unthreaded conduit (7) by the pressing bolt (8) as shown in FIGS. (Upper side of FIGS. 11 and 12) is the maximum (thickest wall), and the minimum (thinnest wall) portion (also of FIGS. 11 and 12) corresponding to the counter electrode (S) of the pressing contact (N) from the maximum portion. The thickness of the end packing (11) is gradually reduced toward the lower side, thereby forming a circular shape in which the inner peripheral surface of the end packing (11) is eccentric from the inner peripheral surface of the coupling body (1) by a certain amount (E). . The diameter (inner diameter) (d2) on the inner peripheral surface of the end packing (11) is about 30.5 mm. (T1) indicates the thickness at the maximum portion, and (t2) indicates the thickness at the minimum portion.

  (X) also shows the center of the opening of the end packing (11), and in the example shown in the figure, this is in the relationship of being eccentric from the opening center (O) of the coupling body (1) by a certain amount (E). is there. The amount of eccentricity (E) substantially corresponds to the amount of movement of the unthreaded conduit (7) pressed by the screwing operation of the pressing bolt (8).

  And from the entrance part of the circular internal peripheral surface in such an end packing (11), the one taper-like elastic lip (11c) which continues with the said cover head (11a) is equal in the 360 degree | times. One conduit receiver that is extended substantially at a right angle (α) by a certain length (Y1) (about 4 mm), and is also connected to the insertion leg membrane (11b) from the back end of the inner peripheral surface. The seat (11d) is also projected at a substantially right angle (β) by an equal fixed length (Y2) (about 2 mm) at 360 degrees, and a concave groove ( The elastic lip (11c) pushed down by insertion of the screwless conduit (7) into the interior of 11e) escapes by itself.

  (12) is a mark such as a triangular figure, a line, a dot or the like indicating the maximum thickness of the end packing (11). The cover head (11a) or elastic material is applied to the surface of the end packing (11). It is given to the surface of the lip (11c) so that it can be easily seen from the outside. Therefore, by seeing this, the end packing (11) can be conveniently fitted into the coupling body (1) without error.

  In this case, since there is a conduit pressing bolt (8) and its receiving screw cap tube (3) on the coupling body (1) side, the end packing (11) side mark ( 12). However, a mark (12) indicating the minimum thickness of the end packing (11) is applied to the surface of the end packing (11), and a matching mark (not shown) therewith is provided on the coupling body (1). It can be added to the torso of the body to make it particularly easy to see.

  In the threaded conduit coupling of the first embodiment, the opening center (X) of the waterproof end packing (11) is eccentric by a certain amount (E) from the opening center (O) of the coupling body (1). Therefore, the pre-centering center partition screw (5) is screw-operated so that its screw shaft (5a) projects from the inner peripheral surface of the coupling body (1), and then to the coupling body (1). When the unthreaded conduit (7) is inserted along the opening center (X) of the end packing (11) from the front-rear direction, the cut end face is received by the center partition screw (5) as shown in FIG. The connection piping state of a simple electric pipe (7) can be obtained.

  In the process of inserting the unthreaded conduit (7) into the coupling body (1), an elastic lip (11c) projecting inward from the inlet portion of the waterproof end packing (11) at a substantially right angle (α), Since it collides with the cut end surface of the conduit (7) and is pushed down to a state where it is bent by about 90 degrees, the outer surface of the conduit (7) is rotated 360 by the strong restoring repulsive force accompanying the deformation action. The conduit (7) is eccentric with the coupling body (1) by a certain amount (E), coupled with the receiving seat (11d) of the end packing (11). Result.

  Therefore, it is only necessary to finally rotate the conduit pressing bolts (8) and firmly press the outer peripheral surface of the unthreaded conduit (7) with the tip of the screw shaft (8a).

  In that case, the thickness of the end packing (11) is the maximum at the portion (upper side of FIGS. 11 and 12) corresponding to the pressing contact (N) of the conduit (7) by the pressing bolt (8). Since the thickness is gradually reduced from the portion to the smallest portion (also below FIGS. 11 and 12) corresponding to the counter electrode point (S) of the pressing contact (N), the conduit (7) is Even if it receives a subsequent pressing force of the pressing bolt (8), the crimping force of the elastic lip (11c) that has been crimped to the outer peripheral surface of the conduit (7) does not decrease, and the conduit (7 ) Can be kept in an even pressure-bonded state at 360 degrees, and there is no risk of water entering during use of the coupling.

  Moreover, since the pressing bolt (8) is a metal product that does not rust, such as stainless steel, and the screw shaft portion (8a) is coated with a waterproof film (9), the screw shaft portion (8a). Accordingly, there is no risk of water entering the interior of the coupling body (1), and an excellent waterproof effect can be obtained.

  If the center partitioning screw (5) is screwed, the unthreaded conduit (7) can be fed relative to the coupling body (1). As a result, the relay box (not shown) is sequentially installed. The cut end face of the unthreaded conduit (7) that has been sent out can be butt-connected at the final point of the piping work without any trouble.

  FIGS. 13 to 16 show a partially modified embodiment of the first embodiment corresponding to FIGS. 1, 2 and 11 and 12, and a screw bolt tube (3) for receiving a pressing bolt and its implantation in view of its configuration. When viewed from the front-rear direction of the coupling body (1), a total of four pressure pipe bolts (8) screwed in are distributed in a symmetric arrangement and a symmetric arrangement. Each pair is in a relational state that maintains a constant crossing angle (γ) (for example, about 60 degrees).

  In such a relatively thick unthreaded coupling for a conduitless tube, the waterproofing unit is fitted and integrated into both ends of the opening of the coupling body (1) due to the correlation with the pressing bolt (8). The thickness of the end packing (11) is on the bisector (diameter line) (PP) of the crossing angle (γ) of the pressing bolt (8), and the screw by the pressing bolt (8) It becomes the maximum at the portion (the upper side of FIGS. 15 and 16) corresponding to the side where the pressing contact (N) of the non-conduit pipe (7) exists, and on the bisector (PP) from the maximum portion. The thickness is gradually reduced as it goes to the minimum part (similarly to the lower side of FIGS. 15 and 16) corresponding to the counter electrode point (S). As a result, it goes without saying that the inner peripheral surface of the end packing (11) opens in a circular shape eccentric from the inner peripheral surface of the coupling body (1) by a certain amount (E).

  And when employ | adopting the structure of such deformation | transformation embodiment, the assembly which aligns with the mark (12) other than the mark (12) which shows the largest part or the minimum part of the thickness in an end packing (11). As shown in FIGS. 13 and 14, the work alignment mark (13) is positioned at the corresponding position on the bisector (PP) in the body of the coupling body (1) (upper or lower in FIGS. 15 and 16). To the side) for easy viewing from the outside.

  Since other configurations and operations are substantially the same as those in FIGS. 1 to 12 described above, only the corresponding reference numerals to those in FIGS. 1 to 12 are written in FIGS. Description is omitted.

  Next, FIGS. 17 to 24 show a threaded conduit coupling according to a second embodiment of the present invention, in which the coupling body (100) is shaped as a zinc alloy die-cast product in a substantially cylindrical shape. ing.

  Then, the convex seat (300) corresponding to the screw bolt receiving cylinder (3) of the first embodiment is raised outward from the body of the coupling body (100) by a certain height. In addition, a pressing bolt receiving screw hole (302) is formed penetratingly formed along the centripetal direction from the groove bottom surface of the sheet packing receiving recessed groove (301) recessed in the central portion thereof.

  Moreover, the large diameter head (800c) of the pressure tube for the conduit pipe (800), which is implanted and screwed into the screw hole (302) so as to be freely advanced and retracted, has a conical shape instead of the hexagonal shape of the first embodiment. At the center, a locking groove (800d) for a turning operation tool such as a hexagon stick wrench is cut out.

  On the other hand, the tip of the screw shaft portion (800a) in the pressing bolt (800) is relatively distant from the notch depression by providing a split groove (800e) that opens in an approximately inverted V-shaped cross section as extracted in FIG. It is also sharpened as a raised ring-shaped claw (800b).

  (303) is a waterproof sheet packing fitted and set in the seat packing receiving groove (301) of the convex seat (300), which is made of an elastic material such as nitrile rubber, and is the pressing bolt of the first embodiment. Both functions of the spring washer (10) inserted in (8) and the waterproof coating (9) of the pressing bolt (8) can be exhibited.

  Reference numeral (200) denotes an expanded edge of the coupling body (100) corresponding to the end flange (2) of the first embodiment, from the inner peripheral surfaces of both ends of the opening in the coupling body (100). It is shallowly cut out. (201) is for receiving end packing, which is located in the back part adjacent to the expanded edge (200) and is notched deeper than the expanded edge (200) from the inner peripheral surface of the coupling body (100). It is a concave circumferential groove, and is depressed in a continuous staircase form of the concave circumferential groove (201) and the spreading edge (200).

  The waterproof end packing (110) of the second embodiment is stepped from the cover head (110a) and the insertion leg membrane (110b) as shown in FIG. 19 with a depth (W) larger than that of the first embodiment. It has a circular ring shape, and is fitted into both ends of the opening of the coupling body (100) from the front and rear, and the inserted leg membrane (110b) is not shown in the figure on the concave groove (201) of the coupling body (100). The cover head (110a) is attached and integrated in an embedded state via an adhesive, and the back surface of the cover head (110a) is also fixed to the end face of the coupling body (100) in a crowned state by an adhesive not shown in the figure. The Rukoto.

  In addition, a first end continuous with the cover head (110a) is formed from the inlet portion of the circular inner peripheral surface eccentric from the inner peripheral surface of the coupling body (100) in the end packing (110) by a certain amount (E). The elastic lip (110c) projects substantially at a right angle (α) by a uniform constant length (Y1) at 360 degrees, while the electric wire of the first embodiment is also seen from the back of the inner peripheral surface. The second elastic lip (110d), which is longer than the tube seat (11d) and pushed down by the insertion of the unthreaded conduit (700), is also substantially perpendicular (β2) by its uniform constant length (Y2) at 360 degrees. ), And a pair of the first and second elastic lips (110c) and (110d) are in parallel.

  In this case, the thickness of the first elastic lip (110c) is changed to be thicker than the thickness of the second elastic lip (110d). The fixed length (Y1) of the first elastic lip (110c) protruding from the inner circumferential surface of the end packing (110) is shorter than the fixed length (Y2) of the second elastic lip (110d). It is dimensioned.

  That is, the second elastic lip (110d) of the waterproof end-packing (110) acts in a prone manner with little resistance in both the front and rear directions, and the unthreaded conduit (700) can be connected to the coupling body ( 100), and the thin-walled so-called high resilience allows the wire pipe (700) to be crimped to the outer peripheral surface with a relatively weak restoring force.

  On the other hand, the first elastic lip (110c) of the end packing (110) receives the pushing force of the conduit tube (700), but does not easily fall down due to its thick low elasticity, and is a powerful restoration. It exerts repulsive force and is crimped to the outer peripheral surface of the conduit tube (700), so that a superimposed waterproof effect with the second elastic lip (110d) can be obtained.

  Further, (111) is a concave groove for receiving the center packing, which is located in the middle of the body portion of the coupling body (100), and is cut out from the inner peripheral surface into a depressed state with a constant depth, Here, a circular ring-shaped waterproof center packing (112) made of an elastic material such as chloroprene rubber having tear resistance is fitted and integrated.

  Furthermore, the thickness of the center packing (112) is the same as that of the end packing (110), and this is also the portion corresponding to the pressing contact (N) of the unthreaded conduit (700) by the pressing bolt (800) (see FIG. 19) is the maximum, and the thickness gradually decreases from the maximum portion to the minimum portion (also the lower side of FIG. 19) corresponding to the counter electrode point (S) of the pressing contact (N). The inner peripheral surface of the center packing (112) is also formed into a circular shape eccentric from the inner peripheral surface of the coupling body (100) by a certain amount (E).

  Needless to say, the center of opening of the center packing (112) corresponds to the center of opening (X) of the end packing (110). (T3) and (t4) indicate the thickness at the maximum portion and the thickness at the minimum portion in the center packing (112), respectively.

  And from the substantially center part of the circular inner peripheral surface in such a center packing (112), the conduit | pipe partition lip (500) which makes a taper-shaped cross-sectional wedge shape has the uniform fixed length (Z) at 360 degree | times. ) And the center partitioning screw (5) of the first embodiment, which is projected as an acute angle (θ) (for example, about 30 to 60 degrees) that is inclined inward and forward or backward. Both functions of the O-ring (6) inserted and set can be exhibited.

  Moreover, with the partition lip (500) projecting obliquely inwardly as a boundary, one half of the center packing (112) on the back side of the partition lip (500) has a large thickness. In contrast, in the other half of the center packing (112), which is also the belly side of the partition lip (500), the thickness of the center packing (112) is thin, and only the difference in thickness is The partition lip (500) falls into the depressed stepped portion (113) as shown in FIG.

  As a result, from the direction (F) adapted to the inclined posture state of the conduit lip (500) in the center packing (112), the unthreaded conduit (700) is moved to the coupling body (100) as shown in FIG. When inserted, the partition lip (500) smoothly falls down without resistance, and a relative feed pipe of the conduit (700) to the coupling body (100) becomes possible.

  Further, when the unthreaded conduit (700) is inserted into the coupling body (100) as shown in FIG. 23 from the direction (R) against the inclined posture state of the partition lip (500), the conduit (700) Since the cut end face of the stub is abutted against the partition lip (500) and the lip (500) is raised from the inner peripheral surface of the coupling body (100) at a substantially right angle, the wedge Due to the action, the electric pipe (700) is reliably received as being unable to penetrate the coupling body (100), and the feed pipe from the reverse direction (R) cannot be performed.

  That is, if the conduit tube (700) is inserted into the coupling body (100) from both the front and rear directions (F) and (R), the cut end faces are intermediate portions in the coupling body (100) as shown in FIG. It is kept in the exact butt connection piping state through the conduit partition lip (500) of the center packing (112) standing upright.

  In the coupling according to the second embodiment, not only the waterproof end packing (110) but also the center packing (112) has a maximum or minimum thickness as shown in FIG. The coupling body is provided with a mark (114) for indicating assembly, and an alignment mark (130) for assembly work that is aligned with the mark (114) of the center packing (112) and the mark (120) of the end packing (110). It is preferable to give to the trunk portion of (100), in particular, as an arrow indicating a direction (F) adapted to the inclined posture state of the conduit lip (500) as shown in FIG. Due to the alignment mark (130) of the arrow, the feeding pipe work of the conduit (700) to the coupling body (100) and the fitting work of the end packing (110) and the center packing (112) are correctly performed at once. It is because it can guide.

  Furthermore, FIGS. 25 and 26 show a partially modified embodiment of the second embodiment corresponding to FIGS. 17 and 18, which is implanted in the convex seat (300) and its screw bolt receiving screw hole (302). As in the case of the partial modified embodiment of the first embodiment, a total of four screwed conduit tube pressure bolts (800) are scattered in a longitudinally symmetrical arrangement and a laterally symmetrical arrangement. When viewed from the front-rear direction of the ring body (100), the pair of left and right sides are in a relationship of maintaining a constant crossing angle (γ).

  Therefore, the structure of such a threaded conduit coupling is a waterproof end that is fitted to and integrated with both ends of the opening of the coupling body (100) in relation to the pressing bolt (800). The thickness of the packing (110) and the thickness of the waterproof center packing (112) which is also fitted and integrated into the middle part of the coupling body (100) are both crossing angles in the pressing bolt (800). (Γ) on the bisector (diameter line) (PP) and corresponding position to the side where the pressing contact (N) of the unthreaded conduit (700) by the pressing bolt (800) exists To the smallest part (also on the lower side of FIG. 26) that corresponds to the counter electrode point (S) on the bisector (PP). The thinner you go, the thinner By reduction is to shape a circular eccentric inner peripheral surface of the end packing (110) and Center packing (112) by a predetermined amount and the inner peripheral surface of the coupling body (100) (E).

  In addition, since the other structure and effect | action in 2nd Embodiment of FIGS. 17-26 and its partial deformation | transformation embodiment are substantially the same as the said 1st Embodiment and its partial deformation | transformation embodiment, the Only the corresponding reference numerals to those in FIGS. 1 to 16 are written in FIGS. 17 to 26, and detailed descriptions thereof are omitted.

1 is a perspective view showing a first embodiment of a threaded conduit coupling according to the present invention. It is a top view of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is an enlarged cross-sectional view taken along line 4-4 of FIG. It is an expanded sectional view extracting and showing a pressure bolt for electric pipes. It is a front view which extracts and shows waterproofing end packing. FIG. 7 is a rear view of FIG. 6. FIG. 7 is a plan view of FIG. 6. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7. FIG. 10 is a sectional view taken along line 10-10 in FIG. 9; It is sectional drawing which shows the use condition of a coupling. It is an expanded sectional view which follows the 12-12 line of FIG. It is a perspective view which shows the partial deformation | transformation embodiment corresponding to FIG. FIG. 14 is a plan view of FIG. 13. FIG. 15 is a cross-sectional view taken along line 15-15 in FIG. 14. It is an expanded sectional view which follows the 16-16 line of FIG. It is a perspective view which shows 2nd Embodiment of the coupling for threadless conduits which concerns on this invention. It is a front view of FIG. FIG. 19 is a cross-sectional view taken along line 19-19 in FIG. 18. It is a perspective view which extracts and shows the pressure bolt for conduits. It is a top view which extracts and shows waterproofing center packing. It is sectional drawing which shows the feed piping state of the electric wire pipe with respect to a coupling main body. It is sectional drawing which similarly shows the receiving state of a conduit tube. It is sectional drawing which shows the butt connection piping state of a conduit tube. FIG. 18 is a perspective view showing a partially modified embodiment corresponding to FIG. 17. FIG. 26 is a front view of FIG. 25.

Explanation of symbols

(1) (100) Coupling body (2) End flange (3) Screw cap (5) Center divider screw (7) (700) Screwless conduit (8) (800) Pressing bolt (8a) (800a) · Screw shaft (8b) (800b) · Claw claw (8c) (800c) · Head (11) (110) · End packing (11a) (110a) · Cover head (11b) (110b) ・ Insertion leg membrane (11c) ・ Elastic lip (110c) ・ First elastic lip (110d) ・ Second elastic lip (11d) ・ Reception seat (11e) ・ Concave groove (12) (120) ・ Mark (13) (130) · Matching mark (112) · Center packing (500) · Conduit lip (200) · Opening edge (300) · Convex seat (E) · Eccentricity (N) · Press contact (S) · Counter electrode (O) · Opening center of end packing (X) · Opening center of coupling body (d1) · Inner diameter of coupling body (D) · Outer diameter of unthreaded conduit (W) · End Packing depth

Claims (6)

A coupling body (1) (100) shaped into a substantially cylindrical shape corresponding to the unthreaded conduit (7) (700);
Conduit pressure bolts (8) (8), which are implanted and screwed into the coupling body (1) (100) as two pairs scattered in a longitudinally symmetrical arrangement on the body of the coupling body (1) (100) so as to be movable forward and backward along the centripetal direction. 800),
And a waterproof end packing (11) (110) having a pair of front and rear circular rings that are respectively fitted and integrated to both ends of the opening of the coupling body (1) (100).
While pushing down the elastic lips (11c) and (110c) protruding from the inner peripheral surfaces of the end packings (11) and (110), the unthreaded conduit tube (7) inserted into the coupling body (1) and (100) is inserted. ) In the coupling for unthreaded conduit that presses the outer peripheral surface of (700) by the screwing operation of the pressing bolt (8) (800) thereafter,
The portion of the end packing (11) (110) corresponding to the pressing contact (N) of the unthreaded conduit (7) (700) by the pressing bolts (8) (800) is maximized. The inner circumferential surface of the end packing (11) (110) is gradually thinned from the portion toward the minimum portion corresponding to the counter electrode point (S) of the pressing contact (N). 1) Form a circular shape that is eccentric by a certain amount (E) with the inner peripheral surface of (100),
The elastic lip (11c) (110c) is projected from the eccentric inner peripheral surface of the end packing (11) (110) by a certain length (Y1), and the outer peripheral surface of the unthreaded conduit (7) (700) is Even if pressed by the pressing bolts (8) and (800), the pressure-bonding state of the elastic lips (11c) and (110c) with respect to the outer peripheral surface is set so as to be maintained substantially evenly at 360 degrees. Sealing structure for couplings for screwless conduits. A coupling body (1) (100) shaped into a substantially cylindrical shape corresponding to the unthreaded conduit (7) (700);
The coupling body (1) and (100) can be moved forward and backward along the centripetal direction as a total of four scattered in a symmetrical arrangement that maintains a crossover angle (γ) and a symmetrical arrangement in the longitudinal direction. Pressure conduit bolts (8) (800) implanted and screwed into
And a waterproof end packing (11) (110) having a pair of front and rear circular rings that are respectively fitted and integrated to both ends of the opening of the coupling body (1) (100).
While pushing down the elastic lips (11c) and (110c) protruding from the inner peripheral surfaces of the end packings (11) and (110), the unthreaded conduit tube (7) inserted into the coupling body (1) and (100) is inserted. ) In the coupling for unthreaded conduit that presses the outer peripheral surface of (700) by the screwing operation of the pressing bolt (8) (800) thereafter,
The thickness of the end packing (11) (110) is on the bisector (PP) of the crossing angle (γ) in the pressing bolt (8) (800), and the pressing bolt (8) It becomes the maximum at the portion corresponding to the side where the pressing contact (N) of the unthreaded conduit (7) (700) exists by (800), and on the bisector (PP) from the maximum portion. The inner circumferential surface of the end packing (11) (110) is gradually reduced in thickness toward the minimum portion corresponding to the counter electrode point (S) of the coupling body (1) (100). Form a circular shape that is eccentric by a certain amount (E) with the surface,
The elastic lip (11c) (110c) is projected from the eccentric inner peripheral surface of the end packing (11) (110) by a certain length (Y1), and the outer peripheral surface of the unthreaded conduit (7) (700) is Even if pressed by the pressing bolts (8) and (800), the pressure-bonding state of the elastic lips (11c) and (110c) with respect to the outer peripheral surface is set so as to be maintained substantially evenly at 360 degrees. Sealing structure for couplings for screwless conduits.   On the surface of the end packing (11) (110), a mark (12) (120) indicating the maximum or minimum thickness of the end packing (11) is provided, while an alignment mark (13) with the mark (12) (120). By applying (130) to the body of the coupling body (1) (100), the end packing (11) (110) is accurately positioned at both ends of the opening of the coupling body (1) (100). 3. The sealing structure for a coupling for screwless conduit according to claim 1 or 2, wherein the fitting state is set so that the fitting operation can be performed. While inserting and screwing one of the center partition screws (5) for receiving the conduit tube into the center of the body of the coupling body (1) so as to be able to advance and retract,
The elastic lip (11c) of the end packing (11) that is crimped to the outer peripheral surface of the unthreaded conduit (7) is projected inward from the inlet portion of the end packing (11) at a substantially right angle (α). Extend the conduit seat (11d) from the back end of the end packing (11) to an almost right angle (β) inward,
2. The relational setting is made so that the elastic lip (11c) pushed down by the unthreaded conduit (7) escapes into the recessed circumferential groove (11e) that is recessed relative to the overhang. Or the sealing structure of the coupling for threadless conduits of 2 description. As the wall thickness gradually decreases from the largest portion corresponding to that of the waterproof end packing (110) to the smallest portion, the inner peripheral surface of the coupling body (100) and a certain amount (E) are also reduced. The waterproof center packing (112) formed in an eccentric circular shape is fitted and integrated into the intermediate portion of the coupling body (100), and
From the eccentric inner peripheral surface of the center packing (112), the conduit lip (500) having a wedge-shaped cross section is projected into a posture state of an acute angle (θ) inclined to either the front or rear,
When the unthreaded conduit (700) is inserted into the coupling body (100) from the direction (F) that adapts to the inclined posture state of the partition lip (500), , While allowing relative feed piping of the unthreaded conduit (700) to the coupling body (100),
When the unthreaded conduit (700) is inserted into the coupling body (1) from the direction (R) against the inclined posture state of the partition lip (500), the partition lip (500) becomes unthreaded conduit (700). 3. A sealing structure for a coupling for a screwless conduit according to claim 1 or 2, characterized in that the conduit (700) is set so as to be unpenetrable by striking against the cut end face of the connector and standing up. . An elastic lip of the end packing (110) that is crimped to the outer peripheral surface of the unthreaded conduit (700) protrudes inward from the inlet portion of the end packing (110) in a substantially right angle (α) and has a short and thick thickness. As a parallel pair of one elastic lip (110c) and a relatively long thin second elastic lip (110d) that also projects from the back of the end packing (110) to the substantially right angle (β) inward.
The screw according to claim 1 or 2, wherein a pair of the first and second elastic lips (110c) (110d) is set so as to be superimposed on the outer peripheral surface of the unthreaded conduit (700). No sealing structure for conduit coupling.

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