JPH066260Y2 - Screwless coupling - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a waterproof screwless coupling used for connecting two connected pipes such as a conduit.

[Conventional technology]

There has been proposed a waterproof type screwless coupling as described above in Japanese Utility Model Publication No. 2-92110. This screwless coupling has a body (1), a plurality of lock pins (2) and a grip case as shown in FIGS. 15 and 16.
It is composed of (3), a waterproof sheet (9) and a closing plate (10).

The body (1) is formed to have a length and an inner diameter into which a terminal portion of a connected pipe (4) made of metal such as an electric wire tube can be inserted, and an opening (5) is formed substantially parallel to the axis along the entire length. It is formed in a tubular shape. Then, a pair of grip portions (6) bent from the both side edges of the opening (5) of the body (1) to the outer peripheral side are formed, and these grip portions (6) are arranged along the axis of the body (1). It is provided over the entire length.

A plurality of lock pins (2) are fixed to the body (1) at intervals in the axial direction of the body (1). That is, the first
As shown in FIG. 7, the lock pin (2) is fitted around the mounting hole (7) on the outer peripheral surface of the body (1) by fitting the cylindrical portion (2a) into the mounting hole (7) formed in the body (1). While being welded (8) to the part,
An annular blade portion (2b) continuous with the columnar portion (2a) slightly projects from the inner peripheral surface of the body (1).

The lock pin (2) is made of a hardened steel material, and the body (1) is not hardened and is easily elastically deformed.

The grip case (3) is formed to have a length equal to that of the body (1) and a narrow width, and both side edge portions (3a) are bent inward so that the grip case (3) is entirely formed in a convex arc shape. Then, the grip case (3) is slid in the direction of the arrow in FIG. 15, and the width of the opening (5) is narrowed while holding the grip part (6) of the body (1), and the grip part (6) is attached. It is adapted to engage with and cover these.

The grip case (3) is made of a metal plate such as steel.

The waterproof sheet (9) is made of a rubber plate that is longer in the circumferential direction than the inner circumferential surface of the body (1), and the closing plate (9) is made of a thin metal plate over the entire outer circumferential surface of the waterproof sheet (9). Ten)
Are fixed by adhesion. The waterproof sheet (9) and the closing plate (10) are provided over the entire length of the body (1).

In order to connect the two connected pipes (4) by using this conventional screwless coupling, first, the grip cases (3) are engaged with the opposite ends of these connected pipes (4). Insert it into the body (1) that is not open from both ends outside.

Next, a pair of grip parts (6) provided on the body (1) is gripped from one end of the grip part (6) while narrowing the width of the opening (5) against the repulsive force in the circumferential direction. Engage the case (3) and slide the grip case (3) in the axial direction of the body (1) while holding the grip part (6) with this case (3).
By connecting the case (3) to the axial direction of the body (1), the connection of the connected pipe (4) is completed.

In this state, the body (11) has a reduced diameter, and the blade portion (2b) of the lock pin (2) penetrates the closing plate (10) and the waterproof sheet (9) to the outer peripheral surface of the connected pipe (4). By biting, the force to pull out from the body (1) is added to the connected pipe (4),
Even if a force perpendicular to the axial direction is applied to (1), the connected pipe
Fix the connection between (4) and body (1) so as not to loosen, reduce the electrical resistance at the connection between connected pipe (4) and body (1), and connect connected pipe (4) Can be maintained at ground potential.

Also, due to the reduced diameter of the body (1), the body (1) and the connected pipe (4)
The tarpaulin (9) sandwiched between and is compressed,
The (9) is crimped to the inner peripheral surface of the body (1) via the closing plate (10) and is also crimped to the outer peripheral surface of the connected pipe (4), and the closing plate (10) is opened (5). ) Is blocked, and these prevent water and the like from entering the connected pipe (4) from the outside of the body (1).

In addition, as shown in FIG. 18, a closing plate (10) made of a thin metal plate is formed in an arc shape having a width sufficient to close the opening (5) of the body (1), (1) Opening on the inner peripheral surface (5) By fixing to one side part, the blade part of the lock pin does not penetrate the closing plate (10) when connecting two connected pipes, only the waterproof sheet In some cases, it penetrates through and penetrates into the pipe to be connected.

[Problems to be solved by the device]

Of the conventional screwless couplings, the one shown in FIG. 18 is configured as described above, and in the state where the two connected pipes (4) are connected, a waterproof sheet ( 9) is hardly present, a gap (G) is created between the terminals, and both side edges of the waterproof sheet (9) overlap,
As shown in FIG. 18, at a portion near the overlapping portion of the waterproof sheet (9), a gap may be formed between the waterproof sheet (9) and the connected pipe (4), and the waterproof property may not be ensured. is there.

Then, in order to eliminate the gap (G), it is necessary to strongly compress the waterproof sheet (9) having a large area to increase the elastic deformation amount at the time of connecting them, so that the grip case (3)
There is a problem that a large force is required for engaging the grip with the grip portion (6) of the body (1), and the connection work is difficult.

The one shown in FIGS. 15 to 17 is the body (1).
The blade case (2b) of the lock pin (2) must be penetrated through the waterproof sheet (9) and the closing plate (11) and bite into the connected pipe (4) due to the reduced diameter of the grip case. (3) the body
When engaging with the grip portion (6) of (1), there is a problem that a force larger than that shown in FIG. 18 is required.

In addition, there is a problem that the welded portion of the lock pin shown by reference numeral 8 in FIG. 17 is easily distorted or deteriorated by heat during welding, and the original function of the lock pin cannot be sufficiently achieved by welding. .

Further, there is a problem that the lock pin itself easily drops from the body due to poor welding.

In addition, there is a problem that high precision dimensions are required when processing the lock pin, and the head of the lock pin causes a gap between the inner peripheral surface of the body and the outer peripheral surface of the connected pipe during mounting.
Unless it was installed in the correct position, the lock pin would wobble and break, and it would have to be fixed with a new member.

This invention solves the above-mentioned problems and can fix two connected pipes in a stable and stable position without welding a lock pin, and can be easily connected with a small force during work. It is an object of the present invention to provide a screwless coupling that can ensure waterproofness at a connecting portion of a pipe to be connected without causing trouble in insertion of a cable or the like.

[Means for Solving the Problems]

This invention discloses a substantially cylindrical metal body (11) having an opening over the entire length in parallel with the axis line, and bending both side edges of the opening toward the outer peripheral side to form a pair of grip portions, and this body. A grip case (13) that holds the pair of grip portions and slides them to engage these grip portions so that the radius of (11) is reduced, and a radial direction on both sides of the body (11). The blade portion (12d) of the lock pin (12) fitted into the mounting hole (17) penetrating into the body is eaten on the outer circumference of the two connected pipes (4) inserted from both sides of the body (11). A plurality of lock pins (1) protruding on the inner peripheral surface of the body (11)
2) and a screwless coupling having a waterproof packing (22) that abuts the opposite ends of the connected pipe (4), in the mounting hole (17), an equal-diameter hole portion (17a) and , This equal-diameter hole (17
and a conical hole portion (17b) that is connected to the inner peripheral side of the body and expands in diameter toward the inner peripheral side of the body, and the lock pin (12) has the equal diameter hole portion (17a). A cylindrical portion (12a) to be fitted, and a cone that is continuous with the cylindrical portion (12a), fits with the conical hole portion (17b), and expands toward the inner peripheral side of the body. A trapezoidal portion (12b) and a blade portion (12d) that is continuous through a step (12c) provided at the large-diameter end of this truncated cone-shaped portion (12b) and has a smaller outer diameter than the large-diameter end. Are sequentially formed from the outer peripheral side to the inner peripheral side of the body, and the cylindrical portion of the lock pin (12) is formed in the equal diameter hole portion (17a) and the conical hole portion (17b) of the mounting hole (17). 12a) and the truncated cone (12
b) are fitted together, and the locking part (19) formed by raising from the inner peripheral part of the body by a punch is locked to the step (12c) of the lock pin (12),
While fixing the lock pin (12) to the body (11), the waterproof packing (22) has a hard ring (23) having an outer diameter equal to that of the connected pipe (4), and both end surfaces of the hard ring (23). In addition to forming a waterproof packing (22) integrally with a soft ring (24) having a slightly larger outer diameter and elasticity than the hard ring (23), an arc-shaped closing plate (21) made of a thin metal plate is formed. It is characterized in that the closing plate (21) is interposed between the waterproof packing (22) and the body (11) to close the opening (15) of the body (11).

[Action]

The threaded coupling according to this invention has a mounting hole (17)
In addition, the equal-diameter hole portion (17a) and the conical hole portion that is connected to the inner peripheral side of the body of the equal-diameter hole portion (17a) and expands toward the inner peripheral side of the body.
(17b) is formed, and the lock pin (12) has a cylindrical portion (12a) fitted with the equal-diameter hole portion (17a), and the cylindrical portion (12a).
While continuing to a), fit with the conical hole (17b),
Also, a truncated cone-shaped part (12b) whose diameter increases toward the inner peripheral side of the body
And a blade portion (12c) that is continuous through a step (12c) provided at the large diameter end of this truncated cone-shaped portion (12b) and has a smaller outer diameter than the large diameter end.
d) are sequentially formed from the outer peripheral side to the inner peripheral side of the body, and the lock pin (12) has a cylindrical shape in the equal-diameter hole portion (17a) and the conical hole portion (17b) of the mounting hole (17). Part (12a) and truncated cone part (12b)
The lock pin (12) and the locking part (19) that is raised from the inner peripheral part of the body by punching.
By locking it to (12c) and fixing the lock pin (12) to the body (11), it is not necessary to weld the lock pin to the outer peripheral surface of the body, and distortion and deterioration due to heat of the lock pin occur Since it can be prevented in advance, there is no risk of the tip of the lock pin breaking. Moreover, the lock pin can be fixed to the body with good workability, and even if it is dropped, it can be easily fitted into the site. In addition, the appearance is good because there are no welds.

In addition, the locking part raised from the inner peripheral side of the body is locked to the step of the lock pin, and the truncated cone-shaped part of the lock pin is supported by the conical hole part of the mounting hole from the inner peripheral side of the body. At this time, the blade of the lock pin firmly bites into the outer peripheral surface of the pipe to be connected, so when a large radial force is applied to the lock pin from the inner peripheral side of the body toward the outer peripheral side, this force is large on the inner peripheral side of the body. It can be received by the circular truncated cone and the peripheral wall of the conical hole. Therefore, there is no risk that the lock pin will come off the body, loosen, or rattling.

Further, the waterproof packing (22) is provided with a hard ring (23) having an outer diameter equal to that of the connected pipe (4), and both end faces of the hard ring (23) are elastic with a slightly larger outer diameter than the hard ring (23). In addition to forming a waterproof packing (22) that is integrated with a soft ring (24), an arc-shaped closing plate (21) made of a thin metal plate is provided,
By interposing the closing plate (21) between the waterproof packing (22) and the body (11) to close the opening (15) of the body (11), the lock pin is connected when the body is reduced in diameter. The soft ring of the waterproof packing can be directly bited into the pipe, and the diameter of the soft ring of the waterproof packing is reduced only in the axial center of the body, and the area that is elastically deformed is small. The pipe to be connected can be connected by simply applying a relatively small force to the grip case when the case is engaged with the grip portion of the body.

Furthermore, the ends of the two connected pipes bite into the soft ring,
Since a hard ring positioned in the axial direction is provided between them, even if the ends of the connected pipes are slightly inclined as illustrated in FIG. It is possible to reliably seal the space between the packing and the outer peripheral surface of the elastically deformed soft ring is crimped to the body and the closing plate, so that the waterproof property of the terminal portion of the connected pipe can be sufficiently ensured.

Moreover, since the waterproof packing has a hard ring between the soft rings, the amount of elastic deformation of the inner peripheral surface toward the center side is small compared to the case where one soft ring that is long in the axial direction is used. It is possible to keep a large cross-sectional area in the ring.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1, 2 and 3, the screwless coupling of this embodiment includes a body (11), a plurality of lock pins (12), a grip case (13), and a closing plate (21). And waterproof packing (22).

The body (11) is a connected pipe (4) made of metal such as a conduit.
The terminal portion is formed to have a length and an inner diameter that can be inserted, and is formed into a substantially cylindrical shape having an opening (15) provided over the entire length in parallel with the axis.

Then, a pair of grip portions (16) are formed by being bent outwardly from both side edges of the opening (15) in a substantially U-shaped cross section. These grips (16) are provided along the entire length of the body (11) along the axis, and the grips (16)
Notches (16a) are formed at both ends of the so as to reduce the width toward the ends.

The body (11) is provided with two lock pins (12) in the circumferential direction, and four lock pins (12) are arranged in this embodiment.
Are fixed in the axial direction with a required mutual spacing.

That is, as shown in detail in FIG. 10, the body (11) is provided with a mounting hole (17) penetrating the body (11) in the radial direction. This mounting hole (17) is a hole of equal diameter immediately on the outer periphery of the body (11).
(17a) and a conical hole (17a) connected to the inner peripheral side of the body of the equal-diameter hole (17a).

The diameter of the conical hole portion (17b) is increased toward the inner peripheral surface of the body (11) and is opened on the inner peripheral surface.

The lock pin (12) has a cylindrical portion (12a) having a diameter that fits in the equal-diameter hole portion (17a) without a gap and an axial length similar to its axial length, and a cylindrical portion (12a). The conical holes (1
It has such a shape and size that it can be fitted and supported in 7b) without a gap.

Furthermore, the truncated cone-shaped portion (1
2b) and a blade portion (12d) connected to the large diameter end of the truncated cone portion (12b) via a step (12c) and having a smaller outer diameter than the large diameter end, the body (11) They are sequentially formed from the outer peripheral side toward the inner peripheral side.

The blade portion (12d) is formed in a tapered truncated cone shape, and is also configured to have a conical recess from the tip surface.

Then, the equal diameter portion (17a) of the mounting hole (17) provided in the body (11)
The columnar part (12a) of the lock pin (12) is fitted to the
The conical hole (17b) of (17) has a truncated cone part of the lock pin (12).
(12b) is fitted and supported from the inner peripheral side of the body (11), the step (12c) of the lock pin (12) is arranged substantially flat with the inner peripheral surface of the body (11), and the blade of the lock pin (12) is The part (12d) is arranged so as to slightly project from the inner peripheral surface of the body (11) in the radial direction thereof.

As described above, since the body (11) is not hardened and is made of a material that is easily elastically deformed, it is close to the mounting hole (17) on both sides of the mounting hole (17) in the axial direction of the body (11). Then, by punching, a recessed portion (18) is formed by plastically deforming the inner peripheral portion of the body (11), and a locking portion (19) that bulges around the recessed portion (18) is formed, By these locking parts (19), the step (12c) of the lock pin (12) is locked from the inner peripheral side of the body (11), and the truncated cone part (12b) of the lock pin (12) is attached to the mounting hole ( It is pressed against the peripheral wall of the conical hole portion (17b) of 17).

For this reason, the truncated cone portion (12b) is connected to the locking portion (19) and the conical hole portion.
The lock pin (12) is firmly fixed to the body (11) and is prevented from coming off by being sandwiched by the peripheral wall of (17b).

Incidentally, the mounting hole (17) is made by punching a metal plate constituting the body (11) in a flat plate, and then the mounting hole (17) has a cylindrical portion (12a) of the lock pin (12) and a truncated cone portion ( It is preferable to fit 12b) and then bend the metal plate to form the body (11), and then punch the punch to fix the lock pin (12) to the body (11) as described above.

Further, the lock pin (2) is made of the steel material that has been quenched as described above, and the body (11) is not quenched and is configured to be easily elastically deformed.

The center stopper (20) is formed at the center of the body (11) in the axial direction so as to protrude from the inner peripheral surface of the body (11) by pressing or the like. The two are opposed to each other and are arranged at the same position as the lock pin (12) in the circumferential direction, and the lock pins (12) are arranged at equal intervals on both sides of the stopper (20).

The grip case (13) is formed to have the same length as the body (1) and a narrow width, and both side edge portions (13a) are bent in a U shape to face each other, and the grip case (13) is formed into a convex arc-shaped cross section. Has been done. Then, the grip case (13) is slid in the longitudinal direction, the width of the opening (15) is narrowed while sandwiching the body (11), the grip case (6) is engaged, and the grip case (13) is covered. Has been done.

The grip case (13) is made of a steel plate or a stainless plate, and the surface of the body (11) and the grip case (13) are plated or painted as needed.

The closing plate (21) is formed in a circular arc shape along the inner peripheral surface of the body (11) by a thin material such as a stainless plate having a thickness of about 0.2 mm, and the shaft of the body (11). The length is equal to the directional length, and the width is such that the opening (15) is closed. Then, the closing plate (21), one side is fixed to the opening (15) one side of the inner peripheral surface of the body (11) by adhesion with a water-resistant adhesive or the like to close the opening (15), Body on the other side
(11) The opening of the inner peripheral surface (15) is supported by the other side portion so as to be slidable in the circumferential direction.

As shown in FIGS. 4 and 5, in the waterproof packing (22), soft rings (24) are integrally provided on both end surfaces of a hard ring (23) by bonding with a waterproof adhesive.

Of these, the soft ring (23) is made of a hard material such as chloropyrene rubber on the inner and outer diameters of the pipe to be connected and the outer diameter, as shown in FIG. 6 and FIG. Engagement recesses (23a) are engaged with the two facing portions of the surface.

Further, as shown in FIGS. 8 and 9, the soft ring (24) is made of an elastic soft material such as chloropyrene sponge and has an outer diameter slightly larger than the outer diameter of the hard ring (23). It has an inner diameter equal to that of the pipe to be connected, and is arranged coaxially with the hard ring (23).

The hard ring (23) and the soft ring (24) may be integrally formed, and the soft ring (24) is not limited to the sponge-like one.

The waterproof packing (22) has a hard ring (23) in which an engagement recess (23a) provided in the hard ring (23) is engaged with a center stopper (20) protruding to an inner peripheral surface of the body (11). (twenty three)
The outer peripheral surface of the is adhered and fixed to the inner peripheral surface of the body (11) with a waterproof adhesive, and the waterproof packing (22)
Positioned axially and circumferentially in (11), body (11)
It is arranged at the axial center of the inner peripheral surface.

Further, most of the outer peripheral surface of the soft ring (24) in the circumferential direction is fitted into the body (11), and the remaining part in the circumferential direction faces the inner surface of the closing plate (21).

To connect two metallic connected pipes (4) such as a conduit using a screwless coupling according to this embodiment, first, the opposite end portions of these connected pipes (4) are connected to a grip case.
Insert (13) into the unengaged body (11) from both ends outside and press the end surface of the connected pipe (4) against the outer end surface of the soft ring (24) of the waterproof packing (22). The insertion length of the two connected pipes (4) into the body (11) is ensured to have a predetermined dimension.

Next, a pair of grips (16) provided on the body (11) is gripped from one end of the grip (16) while narrowing the width of the opening (15) against the repulsive force in the circumferential direction. Engage the case (13) by hitting it with a hammer and slide the grip case (13) in the axial direction of the body (11).
Hold the grip (16) with (3) and attach the case (13) to the body.
By matching the axial direction of (1), the connection of the pipe (4) to be connected is completed.

FIG. 11 shows an example of using the unmatched coupling of this embodiment in which the connected pipe (4) is connected as described above.

In the state where the connected pipe (4) is connected using the screwless coupling according to this embodiment, the body (11) is elastically deformed to reduce the diameter, and the blade portion (12d) of the lock pin (12) is connected. By digging into the outer peripheral surface of the pipe (4), it is possible to apply a pulling force to the connected pipe (4) from the body (11) or a force perpendicular to the axial direction to the body (11). Also the connected pipe (4) and body (1
The connection with the pipe (4) and the body (11) is prevented because the connection with the pipe (1) does not become loose and the connection failure does not occur, and the lock pin (12) surely bites into the pipe (4) to be connected. It is possible to sufficiently reduce the electric resistance in the connection portion with.

Then, due to the diameter reduction of the body (11), the soft ring (24) of the waterproof packing (22) is elastically deformed to reduce the diameter, and the outer peripheral surfaces thereof directly and on the inner peripheral surface of the body (11). It is pressure-contacted via 21) to prevent water and the like from entering inside these pressure-contact surfaces.

The closing plate (21) slides between the inner peripheral surface of the body (11) and the outer peripheral surface of the closing plate (21) when the diameter of the body (11) is reduced, thereby narrowing the width of the opening (15).

And since the closing plate (21) is thin as described above,
The soft ring (24) has a body and a portion that come into pressure contact with the closing plate (21).
The amount of elastic deformation of the portion pressed against (11) is almost the same, and there is almost no gap on both sides of the portion where the closing plate (21) and the body (11) overlap each other, and the body (11) and the closing plate (21) ) And are crimped with an almost uniform force over the entire circumference.

Further, the ends of the two connected pipes (4) bite into the soft ring (24), and the soft ring (24) is elastically deformed into the shape illustrated in FIG. 12, and the ends of the connected pipes (4) are Even if it is slightly inclined as illustrated in FIG. 13, it is possible to reliably seal between the ends of the two connected pipes (4) and the waterproof packing (20).

Therefore, the waterproof property of the terminal portion of the connected pipe (4) can be sufficiently ensured, and water does not enter the waterproof packing (20) or the connected pipe (4) from the outside.

Moreover, since the waterproof packing (22) has the soft ring (23) between the soft rings (24), there is no soft ring as shown in FIG. 14 and only one soft ring (25) that is long in the axial direction. Compared with the reference example using the waterproof packing of, the soft ring (24) of this embodiment has a smaller amount of elastic deformation toward the center side, and these inner diameters and the cross-sectional area inside the soft ring (24) should be kept large. You can

Therefore, when the pipe to be connected (4) is a conduit pipe, a cable or the like to be passed through can be easily passed through the waterproof packing (22) without any trouble.

Then, the diameter reduction of the soft ring (24) due to the diameter reduction of the body (11) at the time of connecting the connected pipe (4) is elastically deformed only in the axial center portion of the body (11). Since the area is small, the grip case (13) can be attached to the grip part (16) of the body (11).
Grip case (13)
Add to.

In this embodiment, the mounting hole (1
In the equal-diameter hole (17a) and conical hole (17) in (7), lock pin (1
The cylindrical portion (12a) and the truncated cone-shaped portion (12b) of 2) are fitted together, and the locking portion (19) raised from the inner peripheral portion of the body (11) by a punch is attached to the lock pin (12). Frusto-conical part (12b)
Since the lock pin (12) was fixed to the body (11) without welding by locking it to the step (12c) provided between the large diameter end of the blade and the blade portion (12d) having a smaller outer diameter than this. , The lock pin (12) can be fixed to the body (11) with good workability. Moreover, the lock pin does not come off.

Further, the truncated cone part (12b) of the lock pin (12) is attached to the mounting hole (17).
By being supported from the inner peripheral side of the body (11) to the peripheral wall of the conical hole portion (17b) of, the blade portion (12d) of the lock pin (12) is provided on the outer peripheral surface of the connected pipe (4) during use. As a result of biting, even if a large radial force is applied to the lock pin (12) from the inner peripheral side of the body (11) to the outer peripheral side, this force is applied to the body (1
1) Frustum (12b) with a large diameter on the inner circumference side and body
(11) It can be received by the peripheral wall with the conical hole (17b) whose inner diameter is large, so the lock pin (12) is
It does not come off from (11) or loosely displace.

In this invention, the number and position of the lock pins fixed to the body are not limited to those in the above-mentioned embodiment, but can be appropriately changed as long as the two connected pipes and the body can be firmly fixed.

Further, in the above-mentioned embodiment, the concave portion (18) and the locking portion by the punch
Although (19) is provided on both sides of the mounting hole (17) in the axial direction of the body (11),
In this invention, the recessed portion and the locking portion formed by the punch may be provided on both sides of the mounting hole in the circumferential direction of the body in close proximity to the mounting hole.
If the force applied to the lock pin is small, a lock pin similar to the above-mentioned conventional one may be used.

Further, the closure plate of the present invention may be fixed to the outer peripheral surface of the waterproof packing with an adhesive.

[Effect of device]

The present invention has the above-mentioned structure, and the mounting hole (17) has
The equal-diameter hole portion (17a) and a conical hole portion (17) that is connected to the inner circumferential side of the body of the equal-diameter hole portion (17a) and expands toward the inner circumferential side of the body.
b) and the lock pin (12), the equal diameter hole (1
7a) and a cylindrical part (12a) that is continuous with the cylindrical part (12a), fits with the conical hole (17b), and expands toward the inner peripheral side of the body. Frusto-conical section (12b)
And a blade portion (12c) that is continuous through a step (12c) provided at the large diameter end of this truncated cone-shaped portion (12b) and has a smaller outer diameter than the large diameter end.
d) are sequentially formed from the outer peripheral side to the inner peripheral side of the body, and the lock pin (12) has a cylindrical shape in the equal-diameter hole portion (17a) and the conical hole portion (17b) of the mounting hole (17). Part (12a) and truncated cone part (12b)
Of the lock pin (12) and the locking portion (19) formed by raising from the inner peripheral portion of the body by punching.
By locking it to 2c) and fixing the lock pin (12) to the body (11), there is no need to weld the lock pin to the outer peripheral surface of the body, and distortion and deterioration due to heat of the lock pin do not occur. Since this can be prevented in advance, there is no risk of the tip of the lock pin breaking. Moreover, the lock pin can be fixed to the body with good workability, and even if it is dropped, it can be easily fitted into the site. In addition, the appearance is good because there are no welds.

In addition, the locking part raised from the inner peripheral part of the body is locked to the step of the lock pin, and the frustoconical part of the lock pin is supported by the conical hole part of the mounting hole from the inner peripheral side of the body. At this time, the blade of the lock pin firmly bites into the outer peripheral surface of the pipe to be connected, so when a large radial force is applied to the lock pin from the inner peripheral side of the body toward the outer peripheral side, this force is large on the inner peripheral side of the body. It can be received by the circular truncated cone and the peripheral wall of the conical hole. Therefore, there is no risk that the lock pin will come off the body, loosen, or rattling.

Further, a waterproof packing (22) is provided with a hard ring (23) having an outer diameter equal to that of the connected pipe (4), and both end faces of this hard ring (23) have elasticity slightly larger than the hard ring (23) and have elasticity. In addition to forming a waterproof ring (22) integrated with a certain soft ring (24), an arc-shaped closing plate (21) made of a thin metal plate is provided, and this closing plate (21) is used for the waterproof packing (22). By closing the opening (15) of the body (11) by interposing it between the body and the body (11), the lock pin can be directly inserted into the connected pipe when the body is reduced in diameter. When the grip case is engaged with the grip portion of the body, since the diameter of the soft ring of the waterproof packing is reduced only by the central portion in the axial direction of the body and the elastically deformed area is small. The pipe to be connected can be connected by simply applying a relatively small force to the grip case.

Furthermore, the ends of the two connected pipes bite into the soft ring,
Since a hard ring positioned in the axial direction is provided between them, even if the ends of the connected pipes are slightly inclined as illustrated in FIG. It is possible to reliably seal the space between the packing and the outer peripheral surface of the elastically deformed soft ring is crimped to the body and the closing plate, so that the waterproof property of the terminal portion of the connected pipe can be sufficiently ensured.

Moreover, since the waterproof packing has a hard ring between the soft rings, the amount of elastic deformation of the inner peripheral surface toward the center side is small compared to the case where one soft ring that is long in the axial direction is used. It has many excellent effects that the cross-sectional area in the ring can be kept large.

[Brief description of drawings]

FIG. 1 is a perspective view of a coupling without screws according to an embodiment of the present invention in an unused state, FIGS. 2 and 3 are partially cutaway plan views and cross-sectional views, and FIG. 5 and 5 are a front view of the waterproof packing and a side view of the upper part in cross section, FIGS. 6 and 7 are a front view of the hard ring and a side view of the upper part in cross section, and FIGS. 8 and 9 are soft rings. FIG. 11 is an enlarged front view and a side view in which an upper portion is cross-sectioned; FIG. 10 is an enlarged vertical cross-sectional view showing a fixing portion of the lock pin to the body
The figure is a perspective view showing an example of use, FIG. 12 is an enlarged vertical cross-sectional view showing a waterproof packing and an end portion of a connected pipe, and FIG. 13 is an enlarged vertical cross-section when the end of the connected pipe is inclined. Figure,
FIG. 14 is an explanatory view in the case of using a waterproof packing of a reference example composed of only a soft ring, FIG. 15 is a perspective view of an example of a conventional unthreaded coupling in an unused state, and FIG.
The figure is a cross-sectional view of the same use state, Fig. 17 is an enlarged cross-sectional view of the fixing part of the lock pin to the body, and Fig. 18 is a cross-section view of the use state showing another example of the conventional screwless coupling. is there. (4) …… Connected pipe, (11) …… Body, (12) …… Lock pin, (12a) …… Cylindrical part, (12b) …… Frustoconical part, (12c) …… Step, (12d) …… Blade part, (13) …… Grip case, (15) …… Body opening, (16) …… Grip part, (17) …… Mounting hole, (17a) …… Equal diameter hole part , (17b) …… Conical hole, (18) …… Recess, (19) …… Locking part, (20) …… Stopper, (21) …… Blocking plate, (22) …… Waterproof packing, (23) ... Hard ring, (23a) ... engaging recess, (24) ... soft ring.

Claims (1)

[Scope of utility model registration request] 1. A substantially cylindrical metal body (11) which is opened along the entire length in parallel with the axis line, and both side edges of the opening are bent to the outer peripheral side to form a pair of grip portions, and this body. A grip case (13) that holds the pair of grip portions and slides them to engage these grip portions so that the radius of (11) is reduced, and a radial direction on both sides of the body (11). Lock pin fitted in mounting hole (17)
The blade part (12d) of the (12) projects into the inner peripheral surface of the body (11) so as to bite into the outer peripheries of the two connected pipes (4) inserted from both sides of the body (11). Multiple Lock Pins (12)
And a screwless coupling having a waterproof packing (22) that abuts the opposite ends of the connected pipe (4), in the mounting hole (17), an equal diameter hole portion (17a), Equal diameter hole (17
a) a conical hole portion (17b) that is connected to the inner peripheral side of the body and expands in diameter toward the inner peripheral side of the body, and the lock pin (12) has the equal diameter hole portion (17a). A cylindrical portion (12a) to be fitted, and a cone that is continuous with the cylindrical portion (12a), fits with the conical hole portion (17b), and expands toward the inner peripheral side of the body. A trapezoidal portion (12b) and a blade portion (12d) that is continuous through a step (12c) provided at the large-diameter end of this truncated cone-shaped portion (12b) and has a smaller outer diameter than the large-diameter end. Are sequentially formed from the outer peripheral side to the inner peripheral side of the body, and the cylindrical portion of the lock pin (12) is formed in the equal diameter hole portion (17a) and the conical hole portion (17b) of the mounting hole (17). 12a) and the truncated cone (12
b) are fitted together, and the locking part (19) formed by raising from the inner peripheral part of the body by a punch is locked to the step (12c) of the lock pin (12),
While fixing the lock pin (12) to the body (11), the waterproof packing (22) has a hard ring (23) having an outer diameter equal to that of the connected pipe (4), and both end surfaces of the hard ring (23). Is a soft ring that has a slightly outer diameter and elasticity than this hard ring (23)
(24) is formed into an integrated waterproof packing (22), and an arc-shaped closing plate (21) made of a thin metal plate is provided, and the closing plate (21) is attached to the waterproof packing (22) and the body ( A screwless coupling characterized in that the opening (15) of the body (11) is closed by being interposed between the screwless coupling and the body.