JP2653975B2 - Pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for connecting pipes, and more particularly to a pipe joint for vertically connecting pipe frames constituting a temporary processing scaffold for construction.

[0002]

2. Description of the Related Art A construction frame used for constructing a temporary framework scaffold is formed in a gate type or a torii type using a steel pipe, and the temporary scaffold is assembled by sequentially connecting the construction frames upward with a pipe joint. .

[0003] The basic structure of a pipe joint used for connection of a building frame is that a lower half of a joint pipe fitted into a vertical pipe of the building frame is fitted into a vertical pipe of a lower building frame and connected with a pin. At the same time, the vertical pipe of the upper building frame is externally inserted into the upper half of the joint pipe, and the two pipes are connected by a pin or the like.

[0004]

Conventionally, various structures have been proposed as the above-mentioned joints, but connection and disassembly work are troublesome and time-consuming, all of which are inconvenient and complicated. And have poor tensile strength. Also, to connect the upper and lower building frames to each other,
An arm lock is required separately.

[0005] Further, when connecting and extracting the upper building frame to and from the joint pipe, there is an inconvenience that the connection mechanism of the joint pipe must be operated each time.

[0006] Therefore, an object of the present invention is to automatically connect only by inserting a pipe, and to automatically return to a connectable state after removing the pipe, thereby facilitating connection and removal operations. An object of the present invention is to provide a pipe joint which can be performed and has excellent tensile strength with a simple structure.

[0007]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a joint pipe having a large-diameter portion on an outer peripheral surface at a central portion, the joint pipe having a large-diameter portion provided on a peripheral wall on one end side from the large-diameter portion. A first through-hole extending over the large diameter portion and the peripheral wall and a second through-hole located in the middle of the peripheral wall are provided side by side in the axial direction of the joint pipe, and are provided inside the joint pipe along the axial direction of the joint pipe. In the middle of the long base rod portion, an operation piece inserted into the first through hole, a lock pin provided with a lock piece inserted into the second through hole at one end of the base rod portion, and a lock pin A spring for urging the operation piece and the lock piece in a direction in which the operation piece and the lock piece penetrate through the respective through holes and protrude to the outside of the joint pipe is incorporated. Pushed at the end The joint piece is formed by forming an inclined surface for allowing the lock piece to be immersed in the joint pipe, and pushing the operation piece into the joint pipe so that the lock piece is immersed in the joint pipe. This adopts a configuration in which a locking concave portion is provided which is retained by engagement with an end of a connected pipe externally inserted into a pipe.

According to a second aspect of the present invention, a joint pipe having a large-diameter portion on an outer peripheral surface at a central portion is provided on a peripheral wall on one end side from the large-diameter portion.
A first through-hole extending over the large diameter portion and the peripheral wall, and a second through-hole located in the middle of the peripheral wall are provided side by side in the axial direction of the joint pipe, and are provided inside the joint pipe in the axial direction of the joint pipe. In the middle of the long rod along
An operation piece to be inserted into the through hole of
A lock pin provided with a lock piece to be inserted into the through hole of
A spring for biasing elasticity in a direction in which the operation piece and the lock piece penetrate through the respective through holes and protrude to the outside of the joint pipe is incorporated into the lock pin, and the lock piece of the lock pin is inserted into the joint pipe. The lock piece is pushed at the end of the connected pipe to form an inclined surface for pushing the lock piece into the joint pipe. In this configuration, the operating piece is set to be movable up and down in the first through hole so that the distal end is brought into contact with the inner surface of the connected pipe to maintain the unlocked state.

[0009]

[Action]

A lock pin pressed by a spring has a lock piece and an operation piece protruding outside a joint pipe. When a connected pipe is inserted into the joint pipe from one end side,
The lock piece pushed by the connected pipe is pushed into the joint pipe by the inclined surface and sinks, and when the connected pipe is inserted to a position where it comes into contact with the large diameter portion, the engagement provided on the connected pipe is provided. The hole faces the lock piece, and the lock piece returns to the protruding state by the pressing of the spring and engages with the engagement hole, so that the connection state between the joint pipe and the connected pipe is obtained.

When the operating piece is pushed in against the spring to release the connection, the lock pin is tilted with the lower end of the base rod as a fulcrum, and the lock piece comes out of the engagement hole and enters the joint pipe. When the lock piece is immersed, the engagement concave portion of the operation piece is engaged with the end of the connected pipe, and the lock piece is kept immersed, whereby the connected pipe can be withdrawn.

When the pipe to be connected is pulled out, the end of the pipe comes out of the locking recess of the operation piece. At this time, the engagement hole of the pipe to be connected is separated from the lock piece. Is in a state where the tip is in contact with the inner peripheral surface of the connected pipe, which does not hinder extraction of the connected pipe, and when the connected pipe is extracted, the lock piece and the operation piece can be connected by pressing the spring Return to.

Second invention A connection state between a joint pipe and a pipe to be connected is obtained by the same operation as in the first invention, and when the operation piece is pushed against a spring to release the connection, the lock is locked. The pin tilts with the lower part of the main body as a fulcrum, and when the lock piece comes out of the engagement hole and enters the joint pipe, the operation piece is pushed down. As a result, the lock pin is entirely lowered, and when the lock pin is released at this depressed position, the lock pin pushed by the spring is brought into contact with the lower end of the lock piece at a position below the engagement hole on the inner peripheral surface of the connected pipe. Stops contact with and does not hinder removal of the connected pipe. When the connected pipe is pulled out, the lock piece
Projecting outside through the through-hole and return to a connectable state.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the first embodiment shown in FIGS. 1 to 4, a pipe joint 1 comprises a joint pipe 2, a lock pin 3 and a spring 4 incorporated in the pipe 2.
It is constituted by.

First, as the joint pipe 2, a large-diameter portion is formed by using a pipe having an outer diameter fitted into a vertical pipe of a building frame, and externally fixing a sleeve 5 to an outer peripheral surface at a central portion. The upper end of the vertical pipe 6 in the lower building frame externally inserted into the upper part abuts on the lower end of the sleeve 5, and the lower end of the vertical pipe 7 in the upper building frame that becomes the connected pipe externally inserted in the upper half part is It will contact the upper end.

The joint pipe 2 and the lower vertical pipe 6 are joined in a retaining shape by a pin 8 which penetrates a fitting portion in a radial direction.

On the peripheral wall between the sleeve 5 and the upper end of the joint pipe 2, there is a first sleeve 5 extending over the sleeve 5 and the peripheral wall.
Through hole 9 and second through hole 10 located in the middle of the peripheral wall
Are provided so as to be aligned on the same line in the axial direction of the joint pipe 2.

The first through hole 9 cuts out the peripheral wall of the sleeve 5 and the joint pipe 2 into a rectangular shape, the lower half is located at the overlapping portion of the sleeve 5 and the peripheral wall, and the upper half is the sleeve 5.
Is located above the upper end of the. Therefore, when the vertical pipe 7 is externally inserted into the upper half of the joint pipe 2, the upper half of the through hole 9 is covered by the lower end of the vertical pipe 7.

As shown in FIGS. 3 and 4, the peripheral wall of the joint pipe 2 is provided on the outer surface of the portion where the second through hole 10 is provided with a part of the peripheral wall recessed so as to protrude inward. A long recess 11 is formed, and a rectangular second through hole 10 is provided on the bottom surface of the recess 11.

Next, the lock pin 3 is shown in FIGS. 1 and 4 (B).
As shown in FIG. 5, an operation piece penetrating the first through hole 9 is provided at an intermediate portion on one side edge of the base rod portion 12 which is longer than the vertical interval between the first through hole 9 and the second through hole 10. 13 and
Lock piece 1 also penetrating through second through hole 10 at the upper end
4 are integrally provided.

The lower end of the base rod 12 has an arc shape.
The operation piece 13 is provided at its upper edge with a locking recess 15 for engaging with the lower end of the vertical pipe 7 externally inserted into the joint pipe 2 from above, and the upper end surface of the lock piece 14 is The lock piece 14 is formed on the inclined surface 16 descending at the distal end so that the lock piece 14 can be immersed inside the joint pipe 2 when pushed at the lower end of the vertical pipe 7 fitted externally to the pipe 2.

The spring 4 is formed by bending an elastic metal plate into a substantially U-shape. The spring 4 is formed between the rear surface of the base rod portion 12 of the lock pin 3 incorporated in the joint pipe 2 and the inner peripheral surface of the joint pipe 2. The operation piece 13 and the lock piece 14 bias the elasticity of the lock pin 3 in the direction in which the operation piece 13 and the lock piece 14 protrude from the respective through holes 9 and 10 to the outside.

When the base rod portion 12 of the lock pin 3 is pressed against the inner surface of the joint pipe 2 by pressing with the spring 4, the locking recess 15 of the operation piece 13 penetrating through the first through hole 9 is The lock piece 14 provided so as to be located outside the outer surface of the vertical pipe 7 and penetrating the second through hole 10 is formed so that the vertical pipe 7 can abut on the inclined surface 16. I have.

The vertical pipe 7 fitted to the joint pipe 2 has a lower end abutting on the upper end of the sleeve 5 so that the lock piece 14 can be freely engaged and disengaged at a position corresponding to the lock piece 14. A hole 17 is provided.

The joint according to the first embodiment of the present invention has the above-described structure. The lower half of the joint pipe 2 is inserted into the upper end of the vertical pipe 6 of the building frame, and the building frame is connected by pins 8. The sleeve 5 and the upper half of the joint pipe 2 project from the upper end of the vertical pipe 6 in advance.

When the vertical pipe 7 is not connected to the joint pipe 2, the lock pin 3 is pushed by the spring 4 toward the first and second through holes 9, 10 as shown in FIG. The piece 13 and the lock piece 14 pass through the respective through holes 9 and 10 and protrude outside the joint pipe 2.

At this time, the upper flat surface 18 of the lock piece 14
Abuts on the upper edge of the second through hole 10, the inclined surface 16 protrudes from the outer surface of the joint pipe 2, and the operation piece 13 is moved from the lower position in the first through hole 9 to the outside of the joint pipe 2. It protrudes.

In this state, the upper surface of the operation piece 13 is equal to or slightly lower than the upper end of the sleeve 5. In this state, when the lower end of the vertical pipe 7 in the building frame is externally inserted into the upper half of the joint pipe 2,
During the insertion, the lower end of the vertical pipe 7 is
6, the inclined surface 16 acts to push the lock piece 14 into the joint pipe 2 by the insertion movement of the vertical pipe 7.

When the lower end of the vertical pipe 7 abuts on the sleeve 5, the engagement hole 17 faces the lock piece 14, and the lock piece 14 that has returned to the protruding position is engaged with the engagement hole, as shown by the dashed line in FIG. 17, the joint pipe 2 and the vertical pipe 7 are joined in a retaining shape so that the upper and lower building frames can be connected.

When a pulling force is applied to the vertical pipe 7, the lower edge of the engaging hole 17 contacts the lower surface of the lock piece 14 and the upper flat surface 18 contacts the upper edge of the second through hole 10. The portion will support the pulling load.

Next, when removing the upper vertical pipe 7, as shown in FIG. 2A, the operation piece 13 is pushed into the joint pipe 2 and the locking recess 15 is inserted into the first through hole 9 as shown in FIG. Is locked to the lower end of the vertical pipe 7 facing the side.

When the operating piece 13 is pushed in, the spring 4 for pressing the lock pin 3 is formed in a substantially U-shape, and the lower bent portion presses the lower end portion of the base rod portion 12 and the one free end forms the base. Since the upper portion of the rod portion 12 is pressed, the lock pin 3
Is tilted about the lower end of the base rod 12 as a fulcrum,
Is kept immersed in the joint pipe 2 and detached from the engagement hole 17.

Next, when the vertical pipe 7 is pulled upward, the lock pin 3 rises following the rise of the pipe 7 and the upper surface of the operation piece 13 contacts the upper end edge of the first through hole 9. At the time when the lock pin 3 stops rising, the lower end of the vertical pipe 7 comes out of the locking recess 15 of the operation piece 13, and at this time, the operation piece 1
3 is released from the holding position, the lock pin 3 moves toward the outside of the joint pipe 2, and the amount of protrusion of the operation piece 13 increases.

When the vertical pipe 7 is pulled out, the engaging hole 17 rises with respect to the lock piece 14, so that the tip of the lock piece 14 comes into contact with the inner peripheral surface of the vertical pipe 7 as shown in FIG. There is no trouble in pulling out the vertical pipe 7.

When the lower end of the vertical pipe 7 passes above the lock piece 14, the lock piece 14 protrudes from the outer surface of the joint pipe 2, and the lock pin 3 allows the vertical pipe 7 to be inserted as shown in FIG. Automatically returns to the normal state.

As described above, the connection between the joint pipe 2 and the vertical pipe 7 can be performed only by inserting the vertical pipe 7 into the joint pipe 2. When the vertical pipe 7 is pulled out, the lock pin 3 automatically returns to a connectable posture when the vertical pipe 7 is pulled out. Operation is easy and efficient.

Next, a second embodiment shown in FIGS. 5 and 6 will be described. Note that the same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof will be omitted.

As shown, the lock pin 3 is
3, a notch 21 is provided at a lower portion, and in a state where the notch 21 faces the inside of the first through hole 9, the operation piece 13 is
The operation piece 13 allows the lock pin 3 to be pushed and pushed down.

The spring 4 uses a leaf spring, and
In the middle of the upper and lower linear portions 4a overlapping the back of
A bent portion 4b that fits into the concave notch 22 provided on the back surface of the linear portion 4b, and a bent portion 4c that is perpendicular to the lower end of the linear portion 4a is bent.
A downward portion 4d is bent at the end of the bent portion 4c, and an inclined bent portion 4e is formed at the upper end of the linear portion 4a. When the lock pin 3 is pressed down, the spring 4 also moves. It has become.

The second embodiment is configured as described above. When the vertical pipe 7 is not connected to the joint pipe 2, the lock pin 3 presses the spring 4 as shown in FIG. As a result, the operation piece 13 and the lock piece 14 are pushed toward the first and second through holes 9 and 10, penetrate the respective through holes 9 and 10, and protrude outside the joint pipe 2.

In this state, when the lower end of the vertical pipe 7 in the building frame is externally fitted to the upper half of the joint pipe 2, the lower end of the vertical pipe 7 is
When the vertical pipe 7 is inserted into the joint pipe 2 by the insertion movement of the vertical pipe 7, the locking piece 14 is pushed into the joint pipe 2. When the lower end of the vertical pipe 7 contacts the sleeve 5, the engaging hole 17 is locked. 5, the lock piece 14 engages with the engagement hole 17, and the joint pipe 2 and the vertical pipe 7
As shown in (B), the upper and lower building frames are connected in a retaining shape so that the upper and lower building frames can be connected.

Next, when the upper vertical pipe 7 is to be removed, the operating piece 13 is pushed toward the joint pipe 2 and the lock piece 14 is immersed in the joint pipe 2 as shown in FIG. .

When the operation piece 13 is pushed down in this pushed state, the notch 21 is fitted to the lower edge of the first through hole 9 as shown in FIG. 6B, and the lock pin 3 and the spring 4 descend. ,
The tip of the lock piece 14 is positioned below the lower edge of the first through hole 9. When the operation piece 13 is released in this state, the flat face 14 a of the tip of the lock piece 14 And stops at a position below the first through hole 9 on the inner peripheral surface of the first through hole 9.

As a result, the lock piece 14 is
And the flat surface 14a of the tip of the lock piece 14 is in contact with the inner peripheral surface of the vertical pipe 7 below the first through-hole 9, so that the lock piece 14 Even in the case of upward movement, that is, in the case where vertical rattling occurs, it is possible to prevent the lock piece 14 from engaging with the engagement hole 17 and making it impossible to pull out the vertical pipe 7.

When the vertical pipe 7 is pulled upward from the state of FIG. 6B, the vertical pipe 7 rises with respect to the lock pin 3, and when the lower end of the vertical pipe 7 passes above the lock piece 14, FIG. As shown in FIG. 6C, the lock piece 14 protrudes from the outer surface of the joint pipe 2 by pressing the spring 4, and the lock pin 3 can automatically return to the connectable posture.

[0046]

As described above, according to the present invention, since the pipe is connected via the lock pin in which the operation piece and the lock piece are integrally formed, the connection having excellent tensile strength can be performed, and the use of the arm lock is achieved. And the lock pin can be kept in a retracted state by locking the operating piece to the connected pipe or by abutting the tip of the lock piece on the inner peripheral surface of the connected pipe. Withdrawing the connected pipe from the pipe can be done by simple operation,
Assembling and dismantling of the temporary framework scaffold can be performed safely and efficiently.

Further, since the lock pin automatically returns to a connectable state after the connection pipe is pulled out, the connection can be made simply by inserting the connection pipe, and the connection work can be performed extremely easily. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a connection state of a first embodiment of a pipe joint.

FIG. 2A is a longitudinal sectional view showing a state at the time of a pipe joint extracting operation, and FIG. 2B is a longitudinal sectional view showing a connected pipe withdrawn state.

FIG. 3A is a front view of a pipe joint, and FIG.

FIG. 4A is a perspective view showing a main part of a joint pipe, and FIG. 4B is a perspective view of a lock pin;

FIG. 5A is a front view showing a second embodiment of the pipe joint, and FIG. 5B is a longitudinal sectional view showing a connection state of the pipe joint;

6A is a longitudinal sectional view showing a state where a lock pin is pushed, FIG. 6B is a longitudinal sectional view showing a state where a lock pin is pushed down, and FIG. 6C is a longitudinal section showing a state after a vertical pipe is removed. Front view

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pipe joint 2 joint pipe 3 lock pin 4 spring 5 sleeve 6, 7 vertical pipe 8 pin 9 first through hole 10 second through hole 12 base rod portion 13 operation piece 14 lock piece 15 locking recess 16 inclined surface 17 Engagement hole

Claims (2)

(57) [Claims] 1. A joint pipe having a large-diameter portion on an outer peripheral surface at a central portion, a first through hole extending between the large-diameter portion and the peripheral wall, from a large-diameter portion to a peripheral wall on one end side, and a middle portion of the peripheral wall. Second
An operating piece inserted into the first through hole in the joint pipe, in the middle of a long base rod along the axial direction of the joint pipe, A lock pin provided with a lock piece to be inserted into the second through hole at one end of the rod portion, and a direction in which the operating piece and the lock piece pass through the respective through hole and protrude to the outside of the joint pipe. And a spring that urges the elasticity of the lock pin.
Pushed at the end of the connected pipe inserted into the joint pipe to form an inclined surface for pushing the lock piece into the joint pipe, and pushing the operation piece into the joint pipe into the operation piece, A pipe joint having a locking concave portion for holding a lock release state in which a lock piece is immersed in a joint pipe by engaging with an end of a connected pipe externally inserted into the joint pipe. 2. A joint pipe having a large-diameter portion on an outer peripheral surface at a central portion, a first through hole extending from the large-diameter portion to one end of the joint pipe, and a first through-hole extending between the large-diameter portion and the peripheral wall. Second
An operating piece inserted into the first through hole in the joint pipe, in the middle of a long base rod along the axial direction of the joint pipe, A lock pin provided with a lock piece to be inserted into the second through hole at one end of the rod portion, and a direction in which the operating piece and the lock piece pass through the respective through hole and protrude to the outside of the joint pipe. And a spring that urges the elasticity of the lock pin.
Pushed at the end of the connected pipe inserted into the joint pipe to form an inclined surface for pushing the lock piece into the joint pipe, and pushing and pushing down the first through hole and the operation piece with the operation piece Accordingly, the pipe joint is set such that the operation piece can move up and down in the first through hole so that the tip of the lock piece abuts on the inner surface of the connected pipe to maintain the unlocked state.