JPH023036Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a pipe joint structure.

[Description of Prior Art] As one of the prior art related to the present invention, there is a pipe joint structure described in Japanese Utility Model Application No. 188392/1983. In order to connect two pipes, this has a first connector that fits around the outer periphery of the joining end of one pipe, and a second connector that fits around the outer periphery of the joining end of the other pipe. are doing. A claw is formed in the first connector, and a groove is formed in the second connector to engage with the claw of the first connector. The groove of the second connector is deep in the center, becomes shallower toward both ends, and finally disappears. As a result of such a groove structure,
By relatively rotating the first connector and the second connector in opposite directions, the engagement between the claw and the groove is released. The connection between one pipe and the other pipe is performed by bringing the first connector and the second connector closer to each other and inserting the claws of the first connector into the grooves of the second connector.

However, in the above conventional technology, the first
There is a problem in that the range in which the claws of the connector can reliably engage with the grooves of the second connector is limited because of the grooves having a release function. That is, when the first connector and the second connector are brought close to each other,
If the pawl hits a shallow part of the groove or a part where there is no groove, a reliable engagement may not be obtained, or a situation may occur where the engagement does not occur completely. In order to obtain reliable engagement, the pawl must engage with the central portion of the groove, which poses a problem of troublesome connection work.

Furthermore, in the above-mentioned conventional technology, it is necessary to form as many complicated groove structures as there are claws, which causes problems such as a lack of ease of manufacture.

[Purpose of the invention] The invention was made based on the above viewpoints,
The purpose is to provide a pipe joint structure that can always provide a reliable connection and also contributes to ease of manufacture.

[Means for achieving the object] In the present invention, a first expanded tube portion 8 and a second expanded tube portion 9 having a smaller diameter than the first expanded tube portion 8 are formed in order from the coupling end face toward the back. a first pipe 1 having a joint portion, an end portion 2a that is inserted from the joint end surface so as to be in close contact with the inner wall of the second expanded tube portion 9 toward the back, and an inner wall of the first expanded tube portion 8; An enlarged tube portion 6 that is inserted in close contact and a flange-like bead portion 7 that abuts the joint end surface of the first pipe 1 are formed in this order, and the bead portion 7 contacts the joint end surface of the first pipe 1. The expanded tube portion 6 is inserted into the joint portion of the first pipe 1 so as to be in contact with the connecting portion of the first pipe 1, and the expanded tube portion 6 has a shorter axial length than the first expanded tube portion 8, and the bead portion 7 is inserted into the joint portion of the first pipe 1. a second pipe 2 that forms an annular receiving gap in the inner part of the first expanded tube section 8 when abutting against the joint end surface; the second pipe 2 fixed to the outer periphery of the joint part of the first pipe 1 and inserted into the first pipe 1; A holder member 4 having a cylindrical storage portion 12 extending so as to surround the outer periphery of the second pipe 2 with a space formed between the holder member 4, a C-shaped frame 14, and an inner side of the frame 14. The locking member 5 is made of an elastic material and has a plurality of claws 15a to 15c formed to project obliquely toward the bead portion 7, and the claws 15a to 15c are attached to the second pipe 2. The holder member 4 is pressed against the inner peripheral surface of the storage portion 12 of the holder member 4 by the opening force of the C-shaped frame 14 so as to protrude obliquely in the insertion direction, and is locked by the inner wall of the storage portion 12. and said nail 1
The projecting ends of 5a to 15c are located on a circumference larger than the outer diameter of the O-ring 3 fitted in the second pipe 2, and the bead portion 7 of the second pipe 2 is located on the circumference of the O-ring 3 fitted in the second pipe 2. The pipe joint structure has the locking member 5 configured to engage with the bead portion 7 when the second pipe 2 is inserted so as to come into contact with the joint end surface of the first pipe 1. Therefore, the above purpose is achieved.

[Embodiment of the invention] FIG. 1 is a side sectional view showing an embodiment of the invention.

In the figure, 1 is a first pipe, 2 is a second pipe, 3 is an O-ring, 4 is a holder member, and 5 is a locking member.

The first pipe 1 and the second pipe 2 have the same diameter,
The joint portion of the second pipe 2 is inserted into the joint portion of the first pipe 1. The second pipe 2 includes an expanded tube portion 6 and a bead portion 7 that are formed to protrude around the outer periphery of the joint portion. The tube expansion portion 6 is formed on the end portion 2a side of the pipe 2. The bead portion 7 extends outward from the expanded tube portion 6 and is continuously formed in the expanded tube portion 6 . The first pipe 1 has a first expanded tube portion 8 that is closed by insertion of the expanded tube portion 6 of the second pipe 2.
and a second expanded tube portion 9 that is closed by insertion of the joint end portion 2a of the second pipe 2. The first expanded pipe part 8 and the second expanded pipe part 9 are formed in order from the joint end surface of the first pipe 1 toward the back of the pipe 1. The axial length of the first expanded tube portion 8 is the second
The first pipe 1 is longer than the expanded pipe part 6 of the pipe.
A second
When the bead part 7 of the pipe 2 comes into contact with the expanded pipe part 6 and the expanded pipe part 6 is completely inserted into the first expanded pipe part 8, a receiving gap for the O-ring 3 is formed in the inner part of the first expanded pipe part 8. It's getting old.

A holder member 4 is provided on the outside of the joint portion of the first pipe 1. The holder member 4 includes a pipe-shaped fixing portion 11 that can be fitted into the expanded tube portions 8 and 9 of the pipe 1.
and a storage portion 12 that projects outward in the axial direction from the joint end surface of the pipe 1. The holder member 4 is
After the fixing part 11 is fitted to the outside of the joint part of the first pipe 1, the terminal end of the fixing part 11 is fixed by a bead part 13 formed on the pipe 1. The storage part 12 has a cylindrical shape that receives the bead part 7 of the second pipe 2 with a margin, and has an insertion opening 4a having a larger diameter than the bead part 7 of the second pipe 2 on its end surface. There is. The locking member 5 is
It is provided on the inner circumferential surface of such a storage section 12.

FIG. 2 is a perspective view showing a specific example of the locking member 5. The locking member 5 is formed by a C-shaped frame 14 made of an elastic material such as stainless steel, and a plate surface of the frame 14 cut down in the axial direction so as to protrude diagonally inward from the frame 14. Three claws 15a, 15
b, 15c. Such a locking member 5 is attached to the holder member 4 through pressure contact using the elasticity of the locking member 5 so that each of the claws 15a to 15c projects obliquely toward the insertion direction of the second pipe 2.
is fixed to the inner circumferential surface of the storage section 12. Locking member 5
When the second pipe 2 is completely inserted, each claw 15a to 15c engages with the bead portion 7 of the second pipe 2 to connect the first pipe 1 and the second pipe 2. Join. The axial length of the frame 14 of the locking member 5 substantially matches the axial length of the inner circumferential surface of the storage portion 12 . Therefore, since the inner surface of the storage portion 12 serves as a stopper, the locking member 5 will not move in the axial direction. The claw 15 of the locking member 5 like this
a to 15c are configured such that their protruding ends are located on a circumference larger than the outer diameter of the O-ring 3 fitted into the second pipe 2. This allows the O-ring 3 to be removed when inserting the second pipe 2.
This prevents catching between the nails 15a to 15c. The storage portion 12 of the holder member 4 has claws 15a to 1.
5c and the bead portion 7 of the second pipe 2, so as to allow the claws 15a to 15c to open to the outside of the bead portion 7 when engaging or disengaging from the bead portion 7 of the second pipe 2.
It is configured.

In the above configuration, the first pipe 1 and the second pipe 2 are connected by passing the second pipe 2, which has an O-ring 3 fitted to the end 2a, through the insertion opening 4a of the holder member 4. This is done by inserting it into the pipe 1. When the second pipe 2 is inserted, the bead portion 7 of the second pipe 2 comes into contact with the claws 15a to 15c of the locking member 5. When the second pipe 2 is further inserted, the bead portion 7 causes the claw 1 to
5a to 15c are opened outward, and finally the claw 15a
~15c climbs over the bead portion 7 and engages with the bead portion 7, and the bead portion 7 of the second pipe 2 abuts the flange 10 of the first pipe 1, causing the second pipe to connect to the first pipe 1. 2 are combined. The O-ring 3 fitted to the end 2a of the second pipe 2 connects to the second expanded section 9 of the first pipe 1 and the end of the second pipe 2 inserted so as to close this expanded section 9. 2a, and the first expanded tube portion 8 of the first pipe 1 and the expanded tube portion 6 of the second pipe 2 inserted so as to close this expanded tube portion 8, the inner part of the first expanded tube portion 8 is Guided placement in the department.

In addition, when separating pipes that are connected,
Insert a separation tool from the insertion opening 4a of the holder member 4 to open each claw 15a to 15c.
This is done by releasing the engagement between ~15c and the bead portion 7 and pulling out one of the pipes.

[Effects of the invention] As explained above, according to the invention, the holder member provided at the joint part of the first pipe is provided with a locking member having a plurality of claws, and the second pipe having a bead part at the joint part is provided with a locking member having a plurality of claws. When the pipe is inserted into the first pipe using the bead part as a stopper, the pawl of the locking member member and the bead part of the second pipe are engaged to couple the pipes. Therefore, it is possible to always obtain a reliable connection by simply inserting the second pipe into the first pipe, and also because it uses a holder member and a locking member that have a simpler structure than the conventional technology. , it is possible to provide a pipe joint structure that also contributes to ease of manufacture.

Furthermore, according to the present invention, since the protruding end of the claw of the locking member 5 is located on a circumference larger than the outer diameter of the O-ring fitted in the second pipe, the second This prevents the O-ring and the claw from getting caught when the pipe 2 is inserted. In addition, since the locking member is constructed as a separate piece from the holder member and is attached to the holder member by pressure welding, it is possible to replace only the locking member, thereby preventing the waste of having to replace the holder member together. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing a specific example of the locking member in FIG. 1. 1...First pipe, 2...Second pipe, 2
a... Connection end, 3... O-ring, 4... Holder member, 5... Locking member, 7... Bead part, 15
a, 15b, 15c...nails.

Claims (1)

[Scope of utility model registration request] A first pipe 1 having a joint part in which a first expanded pipe part 8 and a second expanded pipe part 9 having a smaller diameter than the first expanded pipe part 8 are formed in order from the joint end face toward the back.
, an end portion 2a that is inserted so as to come into close contact with the inner wall of the second expanded tube portion 9 toward the back from the joint end surface, and an expanded tube portion 6 that is inserted so as to come into close contact with the inner wall of the first expanded tube portion 8. and a brim-shaped bead portion 7 that comes into contact with the joint end surface of the first pipe 1 are formed in this order,
The bead portion 7 is inserted into the joint portion of the first pipe 1 so as to come into contact with the joint end surface of the first pipe 1, and the expanded pipe portion 6 has a longer length in the axial direction than the first expanded pipe portion 8. a second pipe 2 that has a short length and forms an annular receiving gap in the inner part of the first expanded tube section 8 when the bead section 7 comes into contact with the joint end surface of the first pipe 1; an O-ring 3 that is fitted onto the outer periphery of the end of the second pipe 2 and arranged in the receiving gap upon insertion of the second pipe 2; The second pipe 2 inserted into the first pipe 1
a holder member 4 having a cylindrical storage portion 12 projecting out so as to surround the outer periphery of the second pipe 2 with a space formed therebetween; a C-shaped frame 14; A plurality of claws 15a to 15c are formed to protrude obliquely toward the bead portion 7.
A locking member 5 made of an elastic material having
The C-shaped frame 1 is attached to the inner peripheral surface of the storage portion 12 of the holder member 4 so as to protrude obliquely in the direction of insertion.
The protruding ends of the claws 15a to 15c are pressed against the inner wall of the storage portion 12 by the opening force of the second pipe 2, and When the second pipe 2 is inserted such that it is located on a circumference larger than the diameter and the bead portion 7 of the second pipe 2 abuts the joint end surface of the first pipe 1. the locking member 5 configured to engage with the bead portion 7;
A pipe fitting structure with.