JP2005249121A - Joint for pipe connection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint for pipe connection capable of firmly connecting pipes regardless of contamination and deformation of inner faces of round pipes to be connected. <P>SOLUTION: The circumference of an approximately central part of a short round pipe having approximately L-shaped engagement notches 3 at its both ends to be engaged with engagement rods 1a, 2a having a diameter insertable to the connected round pipes 1, 2 and mounted inside near end parts of the round pipes, is surrounded by a ring body 5 to fix the ring body to an outer periphery of the short round pipe, small holes 6, 6 are formed on both sides of the short round pipe through the ring body, tip ends of raised parts 7b, 7b of both ends of a horizontal part 7a of a lock member 7 accommodated in the short round pipe are positioned in opposition to the small holes of the short round pipe, and the tip ends of the raised parts of both ends of the lock member can come in and out from the small holes of the short round pipe by a bolt 10 screwed in a screw hole 9 formed on the lock member from a through hole 8 penetrated through the short round pipe from the ring body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joint for connecting round pipes for temporary scaffolds and guard fences used in construction work sites, road construction sites, and the like.

  Conventionally, there are pipe joints of this type as shown in FIGS. 6 and 7, for example. The diameter of the joints can be inserted into the round pipes 11 and 12 to be connected. A ring around a substantially central portion of a short round pipe 14 provided with substantially L-shaped engagement notches 13 at both ends for engagement with engagement rods 11a and 12a respectively attached to the inside of the end portion of the ring. The ring body 15 is fixed to the outer periphery of the short round pipe 14 so as to be surrounded by the body 15.

  The short round pipe 14 has a settling portion 16 formed at a part of the center, and a block having a curved surface between the settling portion 16 and the ring body 15 so that the outer surface is in contact with the inner surfaces of the round pipes 11 and 12. The body 17 is interposed.

  Further, the ring body 15 is provided with a through hole 15a, and the block body 17 is provided with a screw hole 17a. Then, the bolt 18 is screwed into the screw hole 17a of the block body 17 from the through hole 15a of the ring body 15, and the bolt 18 is tightened or loosened, whereby the block body 17 is placed between the settling portion 16 and the ring body 15. The ring body 15 is movable in the circumferential direction (Patent Document 1).

  In order to use the conventional joint for connecting pipes configured as described above, first, one end of one of the round pipes 11 to be connected is inserted into one end of the short round pipe 14 until it abuts against the ring body 15 and further connected. One end of the other round pipe 12 is inserted into the other end of the short round pipe 14 until it hits the ring body 15. Then, the engaging rods 11a and 12a of the connecting round pipes 11 and 12 are engaged with substantially L-shaped engaging notches 13 provided at both ends of the short round pipe 14, respectively. Further, by turning and tightening the bolt 18 screwed into the screw hole 17a of the block body 17, the block body 17 is moved in the circumferential direction of the ring body 15 and is brought into pressure contact with the inner surfaces of the coupled round pipes 11 and 12 (see FIG. 8).

If it does in this way, the connected round pipes 11 and 12 will not rattle and the connection will become very firm.
Japanese Patent Laid-Open No. 11-2217 (page 3, FIGS. 1 to 3)

  However, in the conventional joint for connecting pipes, the connected round pipes 11 and 12 do not rattle, and the connection is very solid. If the inner surfaces of the round pipes 11 and 12 are dirty or deformed, the inner surfaces of the round pipes 11 and 12 and the block body 17 are used. The contact area with the curved surface becomes small, or it becomes slippery due to the contact between the dirty portions of the inner surfaces of the round pipes 11 and 12 and the curved surface of the block body 17, and the connection is very weak.

  That is, at a construction site or road construction site, earth and sand, paint, concrete, asphalt, etc. adhere to the inner surfaces of the round pipes 11 and 12 during storage and transportation of the round pipes 11 and 12. Is often left dirty. Further, during storage or transportation of the round pipes 11 and 12, the round pipes 11 and 12 may be deformed by hitting or dropping them on other objects.

  In such a case, even if it is going to connect the round pipes 11 and 12 using the conventional joint for pipe connection, the contact area of the inner surface of the round pipes 11 and 12 and the curved surface of the block body 17 becomes small, and a friction coefficient is obtained. Becomes smaller and the connection becomes very weak. Further, when the dirty portions of the inner surfaces of the round pipes 11 and 12 come into contact with the curved surface of the block body 17, depending on the dirt (adhering foreign matter), it becomes very slippery and the connection is very weak. .

  Therefore, the present invention aims to solve the problems of the conventional joint for pipe connection, and the inner surface of the connecting round pipe is dirty, not dirty, deformed, or deformed. The aim is to provide a joint for connecting pipes, which is nevertheless a very solid connection.

  Therefore, the pipe coupling joint of the present invention has a diameter that can be inserted into the round pipes 1 and 2 to be coupled, and the engagement rods 1a attached to the inside of the round pipes 1 and 2 near the ends thereof, The ring body 5 is surrounded by a ring body 5 so as to surround the circumference of the short round pipe 4 provided with substantially L-shaped engagement notches 3 at both ends for engaging with 2a. Small holes 6 and 6 are provided on both sides of the ring 4 of the short round pipe 4 so as to be fixed to the outer periphery of the pipe 4, and rises 7 b at both ends of the horizontal portion 7 a of the lock member 7 housed in the short round pipe 4. , 7b are arranged at positions facing the small holes 6 and 6 of the short round pipe 4, and screw holes provided in the lock member 7 from the through holes 8 penetrating the short round pipe 4 from the ring body 5. The bolt 10 screwed into the 9 From small holes 6,6-flop 4, both ends of the rising 7b of the locking member 7, the tip of 7b are made to be retractable.

  In the pipe coupling joint of the present invention, the horizontal portion 7a of the lock member 7 is formed in a substantially bow shape that warps upward.

  Furthermore, in the joint for pipe connection according to the present invention, the rising portions 7b and 7b of the lock member 7 are narrowed toward the tip so that the area of the tip is reduced.

  Since the joint for connecting pipes of the present invention is configured as described above, during storage and transportation of the round pipes 1 and 2 to be connected at a construction site or road construction site, earth and sand, paint, If concrete, asphalt, etc. adheres to the inner surfaces of the round pipes 1 and 2 and the inner surfaces remain dirty, or if the round pipes 1 and 2 are being stored or transported, Even when the round pipes 1 and 2 are deformed by hitting or dropping, the connection between the round pipes 1 and 2 can be made very solid.

  Hereinafter, the best mode for carrying out the pipe coupling joint of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 4, the pipe connecting joint of the present invention has a diameter that can be inserted into the connecting round pipes 1 and 2, and the inside of the round pipes 1 and 2 near the ends thereof, respectively. The ring body 5 surrounds the periphery of the substantially center portion of the short round pipe 4 provided with the substantially L-shaped engagement notches 3 for engaging with the attached engagement rods 1a and 2a. The ring body 5 is fixed to the outer periphery of the short round pipe 4.

  The short round pipe 4 is provided with small holes 6 on the upper surfaces on both sides of the ring body 5, and a lock member 7 is accommodated in the short round pipe 4. The lock member 7 is provided with rises 7b and 7b at both ends of the horizontal portion 7a, and the tips of the rises 7b and 7b are arranged at positions facing the small holes 6 and 6 of the short round pipe 4. Yes.

  Further, a through hole 8 is provided above the ring body 5 and the short round pipe 4, and a screw hole 9 is provided at a substantially central portion of the lock member 7. Then, the bolt 10 is screwed into the screw hole 9 of the lock member 7 from the through hole 8 of the ring body 5 and the short round pipe 4, and the bolt 10 is tightened or loosened, whereby the small holes 6, 6 of the short round pipe 4. Thus, the leading ends 7b, 7b of both ends of the lock member 7 are made to appear and retract.

  The horizontal portion 7a of the lock member 7 has a substantially bow shape that warps upward so that the contact area when the lock member 7 is housed in the short round pipe 4 is reduced. Further, the rising portions 7b and 7b of the lock member 7 are made narrower toward the tip so that the area of the tip becomes small.

  In order to use the pipe connection joint of the present invention configured as described above, first, one end of one of the round pipes 1 to be connected is inserted into one end of the short round pipe 4 until it abuts against the ring body 5, and One end of the other round pipe 2 to be connected is inserted into the other end of the short round pipe 4 until it hits the ring body 5. Then, the engaging rods 1 a and 2 a of the round pipes 1 and 2 to be connected are engaged with the substantially L-shaped engaging notches 3 at both ends of the short round pipe 4, respectively. Further, the bolt 10 screwed into the screw hole 9 of the lock member 7 is turned and tightened, whereby the lock member 7 accommodated in the short round pipe 4 is pulled up, and the lock member 7 is pulled from the small holes 6 and 6 of the short round pipe 4. The tips of the rises 7b and 7b at both ends protrude so that the tips are pressed against the inner surfaces of the round pipes 1 and 2 (see FIG. 4).

  In this case, the area of the tips of the rising edges 7b and 7b at both ends of the lock member 7 is much smaller than the area of the curved surface of the block body 7 of the conventional pipe coupling joint. Therefore, if the force for tightening the bolt 10 is the same, the pressure contact force of the inner surfaces of the round pipes 1 and 2 is stronger due to the rising edges 7b and 7b at both ends of the lock member 7 than due to the curved surface of the block body 7. Become. That is, the pressure contact force per unit area of the inner surfaces of the round pipes 1 and 2 by tightening the bolt 10 is based on the curved surface of the block body 7 of the conventional pipe connection joint, and the lock member 7 of the pipe connection joint of the present invention. Since the rising ends 7b and 7b at both ends of the tube are stronger, the round pipes 1 and 2 are more firmly connected.

  Further, in order to disconnect the round pipes 1 and 2, the bolt 10 screwed into the screw hole 9 of the lock member 7 is turned and loosened to push down the lock member 7 accommodated in the short round pipe 4, thereby shortening the short round pipe. 4 so that the leading ends of the rising edges 7b and 7b of both ends of the lock member 7 are immersed in the short round pipe 4 from the small holes 6 and 6, and the pressure contact between the leading ends and the inner surfaces of the round pipes 1 and 2 is released ( (See FIG. 5). Further, the engagement between the engagement rods 1 a and 2 a of the round pipes 1 and 2 and the substantially L-shaped engagement notches 3 provided at both ends of the short round pipe 4 is released. Then, the round pipes 1 and 2 may be pulled out from both sides of the short round pipe 4.

It is a perspective view which shows embodiment of the joint for pipe connection of this invention. It is a disassembled perspective view which shows embodiment of the joint for pipe connection of this invention. In the joint for pipe connection of this invention, it is sectional drawing which shows the state which has not yet inserted the round pipe connected with the both sides of a short round pipe. In the joint for pipe connection of this invention, it is a cross-sectional view which shows the state which inserted the round pipe connected on both sides of a short round pipe, and fastened the bolt screwed in the screw hole of the lock member. It is a cross-sectional view which shows the state which loosened the volt | bolt screwed into the screw hole of the lock member from the state shown in FIG. It is a perspective view which shows an example of the conventional joint for pipe connection. It is a disassembled perspective view which shows an example of the conventional joint for pipe connection. It is a longitudinal cross-sectional view which shows the state which inserted the round pipe connected with the both sides of a short round pipe in the conventional pipe connection joint, and fastened the bolt screwed in the block body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Round pipe 1a Engagement rod 2 Round pipe 2a Engagement rod 3 Engagement notch 4 Short round pipe 5 Ring body 6 Small hole 7 Lock member 7a Horizontal part 7b Standing up 8 Through hole 9 Screw hole 10 Bolt

Claims (3)

  The diameter is such that it can be inserted into the connected round pipes (1, 2), and engages with the engagement rods (1a, 2a) attached to the inside of the round pipes (1, 2) near the ends. The ring body (5) is surrounded by the ring body (5) around the substantially central portion of the short round pipe (4) provided with the substantially L-shaped engagement notches (3) at both ends. Is fixed to the outer circumference of the short round pipe (4), and further, small holes (6, 6) are provided on both sides of the ring body 5 of the short round pipe (4), and the lock is housed in the short round pipe (4). The ends (7b, 7b) of both ends of the horizontal part (7a) of the member (7) are arranged at positions facing the small holes (6, 6) of the short round pipe (4), and the ring body (5) Screw hole (9) provided in lock member (7) from through hole (8) provided through short round pipe (4) from The tip of the rising edge (7b, 7b) at both ends of the locking member (7) can be freely projected and retracted from the small hole (6, 6) of the short round pipe (4) by the screwed bolt (10). A joint for connecting pipes.   The pipe connection joint according to claim 1, wherein the horizontal portion (7a) of the lock member (7) has a substantially bow shape that warps upward. The joint for connecting pipes according to claim 1, characterized in that the rise (7b, 7b) of the lock member (7) is made narrower toward the tip so that the area of the tip becomes smaller.

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