JP2015075156A - Pipe connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for connecting a first pipe and a second pipe having a circular section, respectively, under a state in which their end portions are abutted to each other, that is used for connecting columns of a temporary scaffold at a construction field and the like, for example.SOLUTION: This invention provides a constitution in which a second pipe (2) is outwardly inserted to a connecting pipe (3) protruded at the end part of a first pipe (1) and at the same time insertion holes (4,4) and engaging holes (5,5) opened at each of the connecting pipe and the second pipe in its diameter direction are coincided to each other, and under this state, lock pins (8,8) arranged at a pair of spring arms (7,7) of a spring means (6) internally installed at the connecting pipe (3) are inserted into and engaged with the engaging holes (5,5) through the insertion holes (4,4), the spring means (6) is hung at and fixed to a disk means (9) to constitute a spring unit (U), and the disk means (9) constitutes a protection cap means (21) covering a protruded end part of the connecting pipe (3) under a state in which the spring means (6) is loaded into the connecting pipe (3).

Description

The present invention is an apparatus for connecting a first pipe body and a second pipe body having a circular cross section in a state in which their end portions are in contact with each other. For example, an apparatus for connecting a column or the like of a temporary scaffold constructed at a construction site or the like About.

2. Description of the Related Art Conventionally, when a temporary scaffold is constructed at a construction site or the like, a connecting device is provided to connect an upper support on a lower support.

The connecting device allows the lower end portion of the upper support column to be extrapolated to a connection tube made of a short tube protruding from the upper end portion of the lower support column, and the connection tube and the upper support column are detachably locked to each other by a lock pin. It is configured as follows.

In order to enable locking by a one-touch operation, spring means is built in the connecting pipe, a lock pin is provided on a pair of spring arms biased in the expanding direction of the spring means, and the lock pin is connected to the connecting pipe. Is inserted through an insertion hole established in the diameter direction. In contrast, a locking hole for inserting and locking the lock pin is formed in the diameter direction of the lower end portion of the upper support column.

Therefore, when the upper support column is lowered from the upper side of the lower support column and extrapolated to the connection pipe, the lock pin recedes from the outer peripheral surface of the connection pipe against the spring arm and abuts the ends of both support columns. When the locking hole and the insertion hole are matched by rotating the upper column in the circumferential direction in this state, the lock pin is inserted and locked in the locking hole, and both the columns are connected so that they cannot rotate and cannot be pulled out. .

In order to disassemble the temporary scaffold, when the upper and lower columns are separated, the lock pin is moved back into the insertion hole of the connecting pipe against the spring arm, and the upper column is pulled out from the connecting pipe.

Japanese Patent No. 2758559

In the case of Patent Document 1 (hereinafter referred to as “prior art”), the spring means extends a pair of leg pieces bent from both ends of a flat elastic spanning piece, and each leg piece has a U-shaped cross section. At the same time, a lock pin is fixed to the lower end of each leg piece.

The spring means is inserted into the insertion hole of the connection pipe in a state in which the spring means is housed in the connection pipe protruding from the lower support column and inserted into the insertion hole of the connection pipe. At this time, a claw-shaped misregistration prevention piece projects from both ends of the elastic spanning piece, the misregistration prevention piece is placed on the protruding end surface of the connecting pipe, and the elastic spanning piece is connected to the connecting pipe. It is comprised so that it may arrange | position in the radial direction.

Therefore, in the case of the prior art, the misalignment prevention piece and the elastic bridging piece are arranged in an exposed state in a state where they are exposed at the projecting end surface of the connecting pipe. For this reason, the upper support column is lowered and extrapolated into the connecting pipe. In some cases, the misalignment prevention piece and the elastic hanging piece may be damaged.

That is, the long strut for constructing the temporary scaffold is a considerable heavy object, and it is made to coincide with the axis of the connecting pipe of the lower strut at a time while being lowered while the operator holds the upper strut. Since it is not easy, the operator usually keeps the lower end of the lowered upper column once on the protruding end surface of the connecting tube, and then extrapolates the connecting column, and the upper column is connected to the connecting tube. It is not uncommon to be dropped drastically when depositing at.

Therefore, in the case of the prior art, there is a risk that the displacement prevention piece and the elastic hanging piece of the spring means will be easily damaged due to the drop impact and load of the upper support, and as a result, when the lock pin loses the predetermined function, There is a problem that causes a great hindrance to field work.

Further, the spring means of the prior art has a risk that the operator's body may be injured or clothing may be damaged because the pair of misalignment prevention pieces project radially from the projecting end face of the connecting pipe.

Further, in the case of the prior art, the spring means formed by a leaf spring is formed with notches at both ends of the elastic spanning piece, and a misalignment prevention piece is extended from one side of the notch, and the other side The leg piece is extended from the part through the bent part, and thereby both leg pieces are opened and closed through elastic deformation of the elastic bridging piece and the bent part. Therefore, if the elastic bridging piece is elastically deformed with the opening and closing of both leg pieces, the elastic deformation spreads to the misregistration prevention piece, so that the misregistration prevention piece is detached from the protruding end surface of the connecting pipe toward the inside of the connecting pipe. There is a risk.

In addition, the prior art has various problems that require improvement.

The present invention provides a tubular body connecting device that solves the above-mentioned problems, and is configured as a means for connecting the first tubular body and the second tubular body, each having a circular cross section, to each other on the same axis. A connecting device for connecting the portions in a butted state, and extrapolating the second tube to a connecting tube protruding from the end of the first tube, and in the diametrical direction of each of the connecting tube and the second tube In a configuration in which the lock pin attached to the pair of spring arms of the spring means built in the connecting pipe is inserted and locked into the locking hole through the insertion hole in a state where the inserted insertion hole and the locking hole are matched. A spring unit is formed by suspending and fixing the spring means to the disk means, and the disk means covers the protruding end of the connecting pipe in a state where the spring means is inserted into the connecting pipe. It is in the point which comprises a protective cover means.

In a preferred embodiment of the present invention, the disk means and the spring means are fixed to each other by a headed shaft member, and the head of the shaft member is disposed on the upper surface of the disk means. Forming a recessed portion recessed toward the inside of the connecting tube, and an annular edge around the recessed portion, and forming a storage portion for storing the head of the shaft member by the recessed portion, The support part mounted in the protrusion end surface of a connection pipe is comprised by the annular edge part.

The spring means includes a flat plate portion that bridges a pair of spring arms, and the disk means is fixed to the flat plate portion, and the flat plate portion forms a rigid portion by bending a side edge portion. It is preferable to do.

The spring means incorporated in the connecting pipe preferably constitutes a centering means for positioning the center of the disk means at the center of the connecting pipe by elastically contacting a pair of spring arms with the inner peripheral surface of the connecting pipe.

In a preferred embodiment of the present invention, in the configuration in which a second tubular body (2) having an inner diameter R4 (R4> R1) is extrapolated to a connecting pipe (3) having an outer diameter R1, the connecting pipe (3) includes: The projecting end portion is formed with a reduced diameter end portion (3a) having an outer diameter R2 (R2 <R1), and the disk means (9) is formed with an outer diameter R3 (R2 <R3 <R4). Yes.

According to the first aspect of the present invention, the protective cover means 21 is configured by the disc means 9 covering the projecting end of the connecting pipe 3 with the spring means 6 mounted in the connecting pipe 3. Therefore, just before the second pipe body 2 is extrapolated and connected to the connection pipe 3, the second pipe body 2 is deposited on the protective lid means 21, thereby facilitating the connection work. Since the second tubular body 2 is suitably supported by the protective lid means 21, there is no possibility that the protruding end face of the connecting pipe 3 or the spring means 6 will be damaged. Moreover, since the disk means 9 does not have protrusions around it, there is no risk of injury to the operator's body or damage to the clothes during work.

Since the spring unit 6 is constructed by suspending and fixing the spring means 6 to the disk means 9 constituting the protective lid means 21, the spring means 6 is built in the connecting pipe 3, and at the same time, the disk The protruding end portion of the connecting pipe 3 can be covered by the means 9, and the mounting work is also easy.

According to the second aspect of the present invention, the headed shaft member 13 that fixes the disk means 9 and the spring means 6 to form the spring unit U has the head 13 a as the storage portion 18 of the recessed portion 16. Since it is stored, there is no possibility that the head 13a is damaged when the second tubular body 2 is deposited in the disk means 9.

According to the third aspect of the present invention, with respect to the configuration in which the spring arms 7 and 7 are extended from the arc-curved portions 11 and 11 of the spring means 6, the rigid portion is added to the flat plate portion 10 that bridges the arc-curved portions 11 and 11. 12, the flat plate portion 10 is prevented from being bent and deformed. Therefore, when the lock pins 8 and 8 are pushed by lowering the second tubular body 2 extrapolated to the connecting tube 3, the flat plate portion 10 is provided. , The lock pins 8 and 8 follow the second tubular body 2 and descend, and there is no risk of biting into the lower end of the insertion hole 4, and only the arc-curved portions 11 and 11 and the spring arms 7 and 7 are elastically deformed. By doing so, the lock pins 8 and 8 can be pushed into the insertion hole 4.

The spring means 6 repeats the elastic deformation of the spring arm 7 every time the connection and disconnection work is performed. The flat plate portion 10 fixed to the disk means 9 is provided with a rigid portion 12, and the flat plate portion 10. Therefore, fatigue due to distortion or the like does not occur at the fixed portion between the flat plate portion 10 and the disk means 9, and the flat plate portion 10 does not fall off the disk means 9.

According to the fourth aspect of the present invention, the centering means 22 is configured by the spring arms 7 and 7 being in elastic contact with the inner peripheral surface of the connecting pipe 3 in a state where the spring means 6 is housed in the connecting pipe 3. Therefore, the disc means 9 is placed in the centering state on the protruding end portion of the connecting pipe 3, and the protective lid means 21 can be positioned.

According to the fifth aspect of the present invention, the reduced diameter end portion 3a having the outer diameter R2 is formed at the protruding end portion of the connecting pipe 3, and the outer diameter R3 of the disk means 9 is changed to the reduced diameter end portion 3a. Since the outer diameter R2 is larger than the outer diameter R2, the disk means 9 can always cover the entire circumference of the reduced diameter end portion 3a, and the spring means 6 suspended and fixed to the lower surface thereof can be seen from above. Shielding suitably.

1 shows an embodiment of a tubular body connecting device according to the present invention, and is a longitudinal sectional view showing a state before a second tubular body is connected to a first tubular body. FIG. 2A shows the operation when the second tube is connected to the first tube, FIG. 3A is a longitudinal sectional view showing a state before the lock pin is retracted, and FIG. 2B is a state where the lock pin is retracted. (C) is a longitudinal sectional view showing a state in which the lock pin is locked in the locking hole and the connection of the second tubular body is completed. The action at the time of releasing the connection between the first tube body and the second tube body is shown, (A) is a cross-sectional view showing the state before the lock pin is retracted, and (B) is the lock pin starting to retract. (C) is a cross-sectional view showing a state in which the lock pin is retracted. The embodiment of the spring unit in the tube connection device concerning one embodiment of the present invention is shown, (A) is a perspective view of an exploded state, and (B) is constituted by attaching a spring means and a disk means. FIG. The preferred embodiment of the lock pin in a spring unit is shown, (A) is a front view showing the material of a lock pin, (B) and (C) are the top view and front view showing the state where the guide surface was formed, (D (E) is a plan view and a front view showing a state where the lock pin is fixed to the spring arm. It is a perspective view which shows the decomposition | disassembly state of a connecting pipe and a spring unit. It is a perspective view which shows the decomposition | disassembly state of the connection pipe | tube which equipped the spring unit internally, and a 2nd pipe body. It is a perspective view which shows the state which connected the 1st pipe body and the 2nd pipe body with the connection apparatus. The operation of a spring unit is shown about another embodiment about the guide surface of a lock pin, (A) is a perspective view of a spring unit, and (B) is a lock at the time of connecting the 2nd tube to the 1st tube. FIG. 5C is a longitudinal sectional view showing a state before the pin is retracted, and FIG. 5C is a longitudinal sectional view showing a state where the lock pin is retracted.

(Embodiment of the present invention)
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The drawing exemplifies a connecting device for connecting the upper struts on the same axis on the lower struts having the same diameter in a circular section when the temporary scaffolding is constructed at a construction site or the like in a state where the ends are butted against each other. ing. However, the coupling device of the present invention is mainly intended for coupling of pipe bodies in the vertical direction, but is not limited to the upper and lower columns of the temporary scaffold, and can be applied as various pipe body coupling devices. The lower strut will be described as the first tube 1 and the upper strut will be described as the second tube 2.

As shown in FIG. 1, the coupling device extrapolates the second tubular body 2 with respect to the coupling pipe 3 formed of a short pipe protruding by being fixed to the end of the first tubular body 1 by welding or the like. At the same time, the spring means 6 built in the connecting pipe 3 in a state in which the insertion holes 4, 4 opened in the diametrical direction of the connecting pipe 3 and the second tubular body 2 are matched with the locking holes 5, 5. A lock pin 8 attached to a pair of spring arms 7, 7 is inserted and locked into the locking hole 5 through the insertion hole 4, and the spring means 6 is suspended and fixed to the disk means 9. This constitutes the spring unit U.

As shown in FIG. 4, the spring means 6 is formed by bending a single plate spring, and is a pair of spring arms 7, 7 that are inclined downward and expanded, and a flat plate that bridges both spring arms. An arc-curved portion 11 is formed at the connecting portion of the flat plate portion 10 and the spring arm 7, and lock pins 8, 8 are projected outwardly in the vicinity of the lower ends of the spring arms 7, 7.

The flat plate portion 10 forms a rigid portion 12 by bending both side edges downward. Therefore, when the pair of spring arms 7 and 7 are deformed in the direction of the closed legs close to each other as indicated by the chain line in FIG. 4B, the entire spring arm 7 and the arcuate curved portion 11 are elastically deformed. The flat plate portion 10 is not bent and deformed due to the deformation, and the flat plate shape of the flat plate portion 10 is always maintained. In the illustrated example, the rigid portion 12 is formed by bending the tongue piece of the flat plate portion 10, but the present invention is not limited to this. For example, another metal plate is laminated and integrated on the flat plate portion 10. By doing so, the rigid portion 12 may be configured.

The disk means 9 is made of a metal plate such as stainless steel, and is constituted by a circular plate that covers the protruding end surface of the connecting tube 3. The flat plate portion 10 is fixed to the lower surface by a headed shaft member 13 such as a rivet. Is done. For this reason, fixing holes 14 and 15 are formed in the center portions of the disk means 9 and the flat plate portion 10, respectively.

The disk means 9 is formed with a recessed portion 16 in which a central region including the fixing hole 14 is recessed toward the inside of the connecting pipe 3, and an annular edge 17 around the recessed portion 16, The recessed portion 16 constitutes a storage portion 18 that houses the head portion 13 a of the shaft member 13, and the annular edge portion 17 constitutes a support portion 19 that is placed on the protruding end surface of the connecting pipe 3. The annular edge 17 is preferably provided with a water drain hole 17a.

Accordingly, the disk means 9 and the flat plate portion 10 are fixed by the headed shaft member 13 in a state where they are stacked one above the other, thereby constituting a spring unit U, and the head 11a of the shaft member 13 is It is stored in the storage portion 18 and does not protrude from the upper surface of the disk means 9 (the upper surface of the annular edge portion 17).

FIG. 5 shows a preferred embodiment of the lock pin 8. As shown in FIGS. 5B and 5C, the lock pin 8 has a peripheral portion of the cylindrical portion 8a, as shown in FIGS. 5B and 5C, with respect to the material 8A shown in FIG. The guide surface 20 is formed by cutting the surface so as to be an inclined surface intersecting the axis Ax. Therefore, when the lock pin 8 formed with the guide surface 20 is caulked and fixed in a state where the shaft portion 8b is inserted into the fixing hole in the vicinity of the tip of the spring arm 7, as shown in FIGS. By adjusting the rotation about the axis Ax, the guide surface 20 is fixed in a state of being inclined obliquely upward. Thereby, the lock pin 8 fixed to the tip of the spring arm 7 constitutes a first guide surface 20a facing the guide surface 20 upward and a second guide surface 20b facing the side.

As shown in FIG. 6, the spring unit U is housed in the connecting pipe 3 in a state in which the pair of spring arms 7 and 7 are elastically deformed in the closed leg direction, and after the interior, as shown in FIG. The spring arms 7 and 7 are elastically restored in the expanding direction to elastically contact the inner peripheral surface of the connecting pipe 3, and the lock pins 8 and 8 are inserted into the insertion holes 4 and 4. In this state, the support portion 19 formed by the annular edge portion 17 of the disc means 9 is placed on the projecting end surface of the connecting pipe 3, whereby the disc means 9 covers the projecting end portion of the connecting pipe 3. The protective lid means 21 is configured.

In the illustrated embodiment, the outer diameter R1 of the connecting pipe 3 is formed such that R1 <R4 with respect to the inner diameter R4 (see FIG. 7) of the second tubular body 2, and as shown in FIG. 3 is reduced in diameter so that the outer diameter R2 of the protruding end portion is R2 <R1, thereby forming the reduced diameter end portion 3a via the tapered portion 3b. On the other hand, the disk means 9 of the spring unit U has an outer diameter R3 of R2 <R3 <R4, preferably R2 <R3 ≦ R1 <R4.

In addition, as shown in FIG. 7, the spring means 6 built in the connecting pipe 3 has a pair of spring arms 7 and 7 elastically contacting the inner peripheral surface of the connecting pipe 3 so that the center of the disk means 9 is connected to the connecting pipe 3. The centering means 22 located in the center of 3 is comprised.

As described above, the spring unit U configured by suspending and fixing the spring means 6 to the disk means 9 includes the spring means 6 in the connecting pipe 3 and allows the lock pin 8 to be inserted into the insertion hole 4 and the spring arm 7. , 7 is brought into elastic contact with the inner peripheral surface of the connecting pipe 3, the disc means 9 is placed on the protruding end of the connecting pipe 3 in a centered state, and the protective lid means 21 covering the protruding end is provided. Configure.

Accordingly, the disk means 9 is held so as to be concentric with the connecting pipe 3 and covers the entire circumference of the reduced diameter end portion 3a by the annular edge portion 17 (support portion 19). The spring means 6 which is closed and suspended and fixed to the lower surface thereof is shielded from above. By the way, when the spring arm 7 is elastically deformed by pushing the lock pin 8 into the insertion hole 4, there is a possibility that the disk means 9 shifts and the center of the disk means 9 deviates from the center of the reduced diameter end 3a. However, even if it is deviated, since it is formed as R2 <R3 as described above, the reduced diameter end portion 3a is not exposed and the state covered by the disk means 9 is maintained. When the spring arms 7, 7 are elastically restored and elastically contacted with the inner peripheral surface of the connecting pipe 3, the disk means 9 automatically centers so that the center thereof coincides with the center of the reduced diameter end 3a. Is done.

(Operation when connecting)
As shown in FIG. 7, in the spring unit U, the whole spring means 6 is built in the connecting pipe 3, and the protruding end portion of the connecting pipe 3 is covered by the disk means 9 constituting the protective lid means 21. In this state, in order to connect the second tube body 2 to the first tube body 1, the connection tube 3 is lowered from above with respect to the connection tube 3 protruding from the first tube body 1. 3 may be extrapolated.

At this time, the disk means 9 positioned at the protruding end of the connecting tube 3 does not have protrusions around it, so there is no risk of injury to the operator's body or damage to clothes during the work.

An operator deposits the second tubular body 2 on the protective lid means 21 before lowering the second tubular body 2 and aligning it with the axial center of the connecting pipe 3, and thereafter, the second tubular body 2 is placed. It can be extrapolated to the connecting pipe 3 while being lifted and aligned with the axis. Therefore, the connecting work is easy. At this time, even when the second tubular body 2 is dropped drastically, the lower end surface 2a of the second tubular body 2 is suitably supported by the protective lid means 21, so that the projecting end surface of the connecting pipe 3 and the spring means There is no risk of damaging 6.

In addition, since the headed shaft member 13 to which the disk means 9 and the spring means 6 are fixed to form the spring unit U has the head 13a stored in the storage portion 18 of the recessed portion 16, the second tubular body. There is no possibility of damaging the head 13a when depositing 2 in the disk means 9.

As shown in FIG. 2A, when the lower end of the second tube 2 is lowered while being extrapolated to the connecting tube 3, the lower end of the second tube 2 is brought into contact with the first guide surface 20 a of the lock pin 8. Abut. When the second tubular body 2 is further lowered from this state, the first guide surface 20a is pushed by the lower end surface of the second tubular body 2 and the spring arm 7 is elastically deformed, as shown in FIG. Then, the lock pin 8 is pushed into the insertion hole 4. When the second tubular body 2 is subsequently lowered and the locking hole 5 is aligned with the insertion hole 4, the lock pin 8 is moved into the locking hole 5 by the elastic restoration of the spring arm 7 as shown in FIG. The second tubular body 2 is connected so that it cannot be pulled out. In this state, as shown in FIG. 8, the lower end surface 2a of the second tubular body 2 abuts against the lower end surface 1a of the first tubular body 1 in abutting condition, and the second tubular body is brought into contact with the first tubular body 1. A load of 2 is supported.

With respect to the pushing operation of the lock pin 8, as shown by a chain line in FIG. 2B, if the rigid portion 12 is not provided in the flat plate portion 10 of the spring means 6, the flat plate portion 10 bends downward and locks. The pin 8 may bite into the lower end edge of the insertion hole 4 and hinder the pushing operation. On the other hand, in the illustrated embodiment of the present invention, the rigid portion 12 prevents the flat plate portion 10 from being bent and deformed, and the spring arm 7 is suspended from the flat plate portion 10 via the arc-curved portion 11. It is possible to suppress the lock pin 8 from descending following the pushing of the second tubular body 2, and to suitably push the lock pin 8 into the insertion hole 4.

(Effect when disconnecting)
When the connection state is released and the second tube 2 is pulled out from the connection tube 3 of the first tube 1, the second tube 2 may be rotated in the circumferential direction as shown in FIG. As shown in FIG. 3 (A), when the second tubular body 2 is rotated as indicated by an arrow M from the state in which the lock pin 8 is inserted and locked in the locking hole 5 of the second tubular body 2, 3B, the edge of the locking hole 5 abuts against the second guide surface 20b of the lock pin 8, and the lock pin is moved by the pushing of the second guide surface 20b and the elastic deformation of the spring arm 7. 8 is pushed into the insertion hole 4. When the second tubular body 2 is further rotated, as shown in FIG. 3C, the locking hole 5 moves to a position disengaged from the insertion hole 4, and the lock pin 8 is pushed in by the peripheral wall of the second tubular body 2. Since the state is maintained, the second tubular body 2 can be pulled out from the connecting pipe 3.

The spring means 6 repeats the elastic deformation of the arc-curved portion 11 and the spring arm 7 every time the connection and release are performed as described above, but the flat plate portion 10 is provided with the rigid portion 12 to prevent the bending deformation. Has been. Therefore, fatigue due to distortion or the like does not occur in the fixed portion including the flat plate portion 10 and the headed shaft member 13 of the disc means 9, and the flat plate portion 10 does not fall out of the disc means 9.

(Another embodiment)
FIG. 9 shows another embodiment relating to the guide surface 20 of the lock pin 8.

In the illustrated embodiment, the lock pin 8 is not adjusted to rotate around the axis Ax as shown in FIGS. 5D and 5E, and as shown in FIG. In the state of being directed, it is fixed to the spring arm 7 of the spring means 6. Therefore, the first guide surface 20a of the above embodiment is not provided.

As shown in FIG. 9B, the insertion hole 4 of the connecting pipe 3 through which the lock pin 8 is inserted forms a long hole 4 a that is long in the vertical direction, and the spring arm 7 is formed on the inner peripheral surface of the connecting pipe 3. The lock pin 8 is inserted through the upper region of the long hole 4a in the state of being elastically contacted. Other configurations are the same as those of the above-described embodiment.

Therefore, according to this other embodiment, when connecting the second tubular body 2 to the first tubular body 1, the second tubular body 2 is extrapolated and lowered to the connecting pipe 3, so that FIG. As shown in FIG. 9, when the second tube body 2 is further lowered after the lower end surface of the second tube body 2 is brought into contact with the lock pin 8, as shown in FIG. The lock pin 8 is moved to the lower region of the long hole 4a through elastic deformation of the portion 11. At this time, the lock pin 8 receives a downward force F1 due to the lower end surface of the second tubular body 2 and an upward force F2 due to the elastic recovery of the arcuate curved portion 11, and therefore is indicated by an axis X in FIG. As described above, the axis X of the lock pin 8 is tilted while moving the long hole 4a. As a result, the lock pin 8 can be pushed into the insertion hole 4 without providing the first guide surface 20a as in the above embodiment. Accordingly, if the second tube body 2 continues to descend, the lock pin 8 is pushed into the insertion hole 4, and then the lock hole 8 of the second tube body 2 faces the lock pin 8. Inserted and locked in the hole 5, the second tubular body 2 is connected so that it cannot be pulled out.

When releasing the connected state, if the second tubular body 2 is rotated, the lock pin 8 is pushed into the insertion hole 4 via the guide surface 20a as in the above embodiment, and the second tubular body 2 is released. Can be pulled out.

DESCRIPTION OF SYMBOLS 1 1st tubular body 1a Upper end surface 2 of 1st tubular body 2 Second tubular body 2a Lower end surface 3 of 2nd tubular body 3 Connection pipe 3a Reduced diameter end 3b Taper 4 Insertion hole 4a Long hole 5 Locking hole 6 Spring means 7 Spring arm 8 Lock pin 8a Cylindrical part 8b Shaft part 9 Disk means 10 Flat plate part 11 Arc-curved part 12 Rigid part 13 Headed shaft member 13a Head part 14, 15 Fixing hole 16 Recessed part 17 Annular edge part 18 Storage part 19 Support Part 20 Guide surface 20a First guide surface 20b Second guide surface 21 Protective lid means 22 Centering means

Claims (5)

A connecting device for connecting the first tube (1) and the second tube (2), each having a circular cross section, on the same axis in a state of abutting each other;
The second tube (2) is extrapolated to the connecting tube (3) projecting from the end of the first tube (1), and the connecting tube and the second tube are inserted in the respective diametrical directions. Lock pins attached to the pair of spring arms (7, 7) of the spring means (6) built in the connecting pipe (3) in a state where the holes (4, 4) and the locking holes (5, 5) are matched. (8, 8) in the configuration of inserting and locking the locking hole (5, 5) through the insertion hole (4, 4),
A spring unit (U) is constructed by suspending and fixing the spring means (6) to the disk means (9),
The disk means (9) constitutes protective lid means (21) covering the protruding end of the connecting pipe (3) with the spring means (6) inserted in the connecting pipe (3). A tube connecting device characterized by comprising: The disk means (9) and the spring means (6) are fixed to each other by a headed shaft member (13), and the head (13a) of the shaft member is disposed on the upper surface of the disk means (9). And
The disc means (9) forms a recessed portion (16) recessed toward the inside of the connecting pipe (3), and an annular edge (17) around the recessed portion,
The recessed portion (16) constitutes a storage portion (18) for storing the head portion (13a) of the shaft member, and the annular edge portion (17) is placed on the protruding end surface of the connection pipe (3). 2. The tube connecting device according to claim 1, wherein the tube connecting device comprises a support portion (19). The spring means (6) includes a flat plate portion (10) that bridges a pair of spring arms (7, 7), and the disc means (9) is fixed to the flat plate portion.
The tube connecting device according to claim 1 or 2, wherein the flat plate portion (10) is formed with a rigid portion (12) by bending a side edge portion. The spring means (6) incorporated in the connection pipe (3) is formed by elastically contacting a pair of spring arms (7, 7) with the inner peripheral surface of the connection pipe (3), thereby allowing the center of the disk means (9) to be centered. 4. A tube connecting device according to claim 1, 2 or 3, characterized in that it comprises a centering means (22) for positioning the tube at the center of the connecting tube (3). In the configuration in which the second tube (2) having the inner diameter R4 (R4> R1) is extrapolated to the connecting pipe (3) having the outer diameter R1,
The connecting pipe (3) forms a reduced diameter end (3a) having an outer diameter R2 (R2 <R1) at the protruding end,
5. The pipe connecting device according to claim 1, wherein the disk means (9) is formed to have an outer diameter R3 (R2 <R3 <R4).

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