JPH0721220U - Portable pipe splicer - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to compress the pipe connection joint between a pair of compression dies by aligning the center line of the die with the center line of the pipe even when the protruding length of the pipe from the floor or wall surface is short. Provide a portable pipe connecting machine that can. [Structure] At a tip side of a pair of jaws 82, 84 rotatably arranged on a support frame 78 around a support shaft 80 perpendicular to a cylinder center line C1, a hydraulic cylinder 24 is rotated from a plane of rotation by a predetermined inclination angle α. The tool mounting portion 86 inclined in the front-back direction is provided, and the die center line C2 of the pair of compression dies 92 held by the tool mounting portion 86 is inclined by the inclination angle α from the direction perpendicular to the cylinder center line C1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe connecting machine, and more particularly to an improvement of a portable pipe connecting machine for performing compression processing by sandwiching a pipe connecting joint for connecting a pipeline between a pair of compression dies.

[0002]

[Prior art]

 For example, at a piping site of a water supply / drainage pipe, in order to integrally compress the pipe connection joint 190 as shown in FIG. A portable pipe connector equipped with a hydraulically driven caulking mechanism is known. The pipe connector described in JP-A-63-26226 is one example. According to such a pipe connecting machine, as shown in the cross-sectional view of FIG. 10, an O-ring 194 is inserted between the pipe 192 and the pipe connecting joint 190, and they are compressed from the outer peripheral side to be integrated. It is possible to connect them mechanically and connect them in a liquid-tight manner as a conduit.

11 and 12 are a partially cutaway front view and a plan view showing an example of such a portable pipe connector. A support frame 210 including a sleeve 206 and a pair of brackets 208 is integrally provided on the front side of a hydraulic cylinder 204 that drives the output rod 202 forward and drives the brackets 208. A pair of jaws 214, 216 are rotatably arranged around a pair of support shafts 212 that are perpendicular to the center line C1 of the hydraulic cylinder 204, and the tips of the jaws 214, 216 are mounted on a tool. A pair of compression dies 222 are attached to the parts 218 and 220. A pair of rollers 226 is rotatably supported by a slide member 224 fixed to the output rod 202, and the pair of rollers 226 are moved rearwardly of the pair of jaws 214, 216 as the output rod 202 is ejected. By making contact with the cam surfaces 228 and 230 provided at the ends, a compressing force in the closing direction is applied to the pair of compression dies 222. In the state shown in the drawing in which the output rod 202 is retracted, the pair of jaws 214 and 216 are held in the closed state by the leaf spring 232, but when the pipe connection joint is sandwiched between the pair of compression dies 222. , The jaws 214, 216 are opened and rotated by sandwiching the rear ends of the jaws 214, 216 with fingers.

In the tool mounting portions 218 and 220, the die center line C2 of the compression die 222 in the closed state is parallel to the axis line of the support shaft 212, that is, at right angles to the cylinder center line C1 of the hydraulic cylinder 204, and A pair of compression dies 222 is held so that they can be inserted and removed in a direction parallel to the center line C2, and a plurality of types of compression dies 222 prepared according to the diameter of the pipe connection joint 190 are used by replacement. You can do it. Further, the hydraulic cylinder 204 is integrally provided in a small hydraulic pressure generation unit (not shown) on the right side, and can be easily carried together with the hydraulic pressure generation unit.

[0005]

[Problems to be solved by the device]

 However, in such a conventional portable pipe connector, the die center line C2 is perpendicular to the cylinder center line C1, and the compression die 222 performs compression processing in one plane including the cylinder center line C1. Therefore, for example, when connecting another pipe to a pipe that is embedded in concrete or the like and has an end protruding, if the protruding size of the pipe on the embedded side is small, the hydraulic cylinder 204, the support frame 210, etc. Depending on the situation at the piping site, it could be very difficult to work with, such as interference with concrete. More specifically, as shown in FIG. 13, one pipe 236 protruding from the floor surface 234 such as a concrete is provided with a pipe connection joint 238 to be connected to the other pipe 240, or as shown in FIG. When the pipe connecting joint 246 is disposed on one pipe 244 protruding from the wall surface 242 and is connected to the other pipe 248, the dimension d1 from the floor surface 234 to the compression processing portion and the compression processing from the wall surface 242 are performed. If the dimension d2 to the portion is small, the hydraulic cylinders and the like interfere with the floor surface 234 and the wall surface 242 and the die center line C2 is inclined with respect to the center lines of the pipes 236 and 244. It cannot be processed. For this reason, conventionally, in such a case, the floor surface 234 is dug down or the wall surface 242 is cut out according to the shape of the pipe connector to perform compression processing of the joint, and then backfilling them is extremely efficient. I had to do bad construction.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to compress a pipe connecting joint even when the pipe has a short protruding length from the floor or wall surface. It is to provide a portable pipe connector.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the gist of the present invention is that (a) a support frame integrally provided on the hydraulic cylinder so as to extend forward of the hydraulic cylinder, and (b) the support frame. Each of the hydraulic cylinders is rotatably arranged around a support axis that is perpendicular to the cylinder center line, and the output rods of the hydraulic cylinders are projected or retracted so that the compression dies on the tip side approach each other. A portable pipe connector equipped with a pair of jaws that is driven to be closed and that compresses a predetermined pipe connection joint with the compression die, wherein the compression die has a die center line in a closed state and a cylinder center line. This is because the hydraulic cylinder is tilted in the front-back direction from a right angle direction.

[0008]

[Effect of action and device]

 In such a portable pipe connector, since the die center line of the compression die is inclined from the direction perpendicular to the cylinder center line of the hydraulic cylinder to the front-rear direction of the hydraulic cylinder, the die center line is In the state where the compression processing part is sandwiched by aligning with, the hydraulic cylinder etc. is located at a position retracted from the position of the compression processing part, and the end of the pipe that is buried in the floor surface and the like is protruding. In this case, the distance from the floor surface or the like to the hydraulic cylinder or the like becomes large. For this reason, even if the pipe has a short protruding length from the floor surface, the die center line should be aligned with the pipe center line for compression processing without the hydraulic cylinder or support frame interfering with the floor surface or wall surface. Is possible. As a result, the pipe joint can be satisfactorily compressed without digging the floor surface or boring the wall surface as in the conventional case.

[0009]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a plan view showing an overall configuration of a portable pipe connector 10 (hereinafter, simply referred to as a pipe connector 10) which is an embodiment of the present invention. The pipe connecting machine 10 includes a grip portion 14 that is equipped with a battery storage portion 12 and is gripped by one hand, and a pump driving electric motor that is turned on only while a switch 16 provided on the grip portion 14 is pushed. The motor 18, a gear mechanism for transmitting the rotational force of the electric motor 18 and the like are accommodated therein, and a housing 22 to which an oil tank 20 is attached, a hydraulic cylinder 24, and a tool head 26 are integrally provided. FIG. 3 is a front view mainly showing the tool head 26.

FIG. 4 is a diagram showing a hydraulic circuit of the pipe connector 10. The hydraulic pump 28 operated by the electric motor 18 is connected to the oil tank 20 via the check valve 30 and is connected to the discharge oil passage 34 via the check valve 32. The discharge oil passage 34 is connected to the oil supply / exhaust oil passage 38 via a switching valve 36 that is switched between an operating state and a non-operating state depending on the supply state of hydraulic oil from the hydraulic pump 28. The supply / discharge oil passage 38 is connected to the pressurizing chamber 40 of the hydraulic cylinder 24, and is also connected to the relief valve 44 via the branch oil passage 42. When the hydraulic oil is supplied from the hydraulic pump 28, the switching valve 36 is in an operating state in which the hydraulic oil pressure communicates the discharge oil passage 34 with the supply / discharge oil passage 38, and the hydraulic oil is not supplied from the hydraulic pump 28. Is switched by a spring to bring the oil supply / discharge passage 38 into the discharge oil passage 46 into a non-operating state as shown in the drawing. Further, the relief valve 44 is opened when the hydraulic pressure in the circuit becomes higher than necessary, thereby connecting the branch oil passage 42 to the discharge oil passage 46 so that the hydraulic oil in the supply / exhaust oil passage 38 can be discharged. It is for relief to the tank 20 side.

The oil supply / drain passage 38 is an oil passage for supplying hydraulic oil to the pressurizing chamber 40 and for discharging hydraulic oil from the pressurizing chamber 40. When the hydraulic pump 28 is operated by the motor 18, hydraulic oil is supplied to the pressurizing chamber 40 via the check valve 32, the discharge oil passage 34, the switching valve 36, and the oil supply / discharge passage 38. When the hydraulic oil is supplied to the pressurizing chamber 40, the piston 50 is moved rightward in FIG. 4 against the biasing force of the compression coil spring 52, and the piston 50 is moved to the opposite side of the pressurizing chamber 40. The output rod 54 provided is ejected. On the other hand, when the pushing operation of the switch 16 is released, the operation of the electric motor 18 is stopped and the hydraulic oil is no longer supplied from the hydraulic pump 28 to the switching valve 36. The passage 50 communicates with the passage 48, so that the piston 50 of the hydraulic cylinder 24 is pushed back according to the urging force of the compression coil spring 52, and the working oil in the pressurizing chamber 40 passes through the oil supply / exhaust passage 38 and the oil discharge passage 48. It is returned to the tank 20.

FIG. 5 is a view showing in detail a part of the housing 22 on the tip side of the housing 22 in a state of being cut away. As can be seen from FIG. 5, the cylinder 24 has an end surface of the housing 22. A cylinder housing 62 is composed of an inner tube 58 extending from the inner tube 58 and having an inner cylinder side 56, and an outer tube 60 fitted to the outer side of the inner tube 58. The piston 50 is slidably provided. The output rod 54 is formed integrally with the piston 50 in a state of protruding from the bottom portion 60a of the outer tube 60 to the front, that is, to the left in FIG. On the bottom side of the cylinder bore 56, the oil supply / drain passage 38 connected to the pressurizing chamber 40 is formed, and although omitted in FIG. 4, a sub-portion formed in the center of the piston 50 and the output rod 54 is omitted. A sub-piston 66 that is slidable in the cylinder bore 64 is provided, and the oil supply / discharge passage 38 is connected to the sub-cylinder bore through a communication hole 68 provided at the center of the sub-piston 66. It communicates with a pressurizing chamber 70 formed on the bottom side of 64. Further, the compression coil spring 52 is arranged between the piston 50 and the bottom portion 60a of the outer tube 60, and when the hydraulic pressure in the pressurizing chambers 40 and 70 decreases, the working oil is supplied to and discharged from the oil passage. The piston 50 is pushed back to the bottom side of the cylinder bore 56 while being pushed out to 38, and the piston 50 is held at the initial position shown in the figure when the hydraulic pump 28 is stopped.

In the inner tube 58 and the outer tube 60, a wire 72 such as a Piano wire is inserted between a pair of annular grooves provided so as to form an annular passage having a circular cross section when both are fitted. By being passed, the outer tube 60 is connected to the inner tube 58 so as not to be detachable in the axial direction and relatively rotatable about the axis. Therefore, the posture of the outer tube 60 and the tool head 26 around the cylinder center line C1 of the hydraulic cylinder 24 can be easily changed according to the working conditions. FIG. 1 is a front view of the tool head 26, which is partially cut away when viewed from the bottom of FIG.

As is apparent from FIGS. 1 and 5, the tool head 26 is provided with a sleeve 74 provided so as to be screwed onto the outer circumference of the outer tube 60 of the hydraulic cylinder 24 and extend forward, and the sleeve 74. A support frame 78 including a pair of brackets 76 fixed to the front end side and a support frame 78 rotatably provided around a pair of support shafts 80 that are perpendicular to the cylinder center line C1 of the hydraulic cylinder 24 and parallel to each other. A pair of jaws 82 and 84, and a leaf spring 90 which is arranged between the pair of jaws 82 and 84 and which always urges the tool attachment portions 86 and 88 on the tip ends thereof in the closing direction. A pair of compression dies 92 and 94 detachably attached to the tool attachment portions 86 and 88, respectively, and a tip of the output rod 54 of the hydraulic cylinder 24. It has a slide member 96 fixed to the end and driven to protrude, and a pair of cam rollers 100 rotatably provided on the slide member 96 about a pair of pins 98 parallel to the support shaft 80. Has been done.

The sleeve 74 of the support frame 78 has a bottomed cylindrical shape around the cylinder centerline C1 and has a notch 102 on the bottom side thereof that is parallel to the plane of rotation of the pair of jaws 82 and 84. . On the surfaces of the notches 102 facing each other, a fitting step portion 104 is provided in parallel with the center line C 1, and the rear end sides of the pair of brackets 76 are directed to the fitting step portion 104. In this state, the penetrating shaft 106 is disposed so as to penetrate the sleeve 74 in parallel with the supporting shaft 80, so that the pair of brackets 76 supporting both ends of the supporting shaft 80 are integrally fixed to the sleeve 74. Has been done. Further, E-shaped retaining rings 81 are provided at both ends of each support shaft 80, and the support shaft 80 is prevented from coming off from the pair of brackets 76, so that the pair of jaws 82, 84. Are assembled together.

On the tip end side of the pair of jaws 82, 84, the tool mounting portions 86, 88 have a predetermined inclination angle α (about 20 ° in this embodiment) with respect to a rotation plane perpendicular to the support shaft 80. However, the levers 108 and 110 on the rear end side of each of the jaws 82 and 84 have cam surfaces 112 and 114 having a predetermined inclination on the end surfaces facing each other. Are formed respectively. When the slide member 96 is driven to protrude to the left in FIG. 5, the pair of cam rollers 100 are brought into contact with the cam surfaces 112 and 114, respectively, so that the pair of compression dies 92 and 94 are separated from each other. A compressive force in the closing direction is applied. As shown in FIG. 5, when the pump 28 is stopped, the piston 50 and the output rod 54 are held at the initial position, and the cam roller 100 is at the retracted position where the cam roller 100 does not interfere with the lever portions 108 and 110, the compression die 92 is pressed. The pair of jaws 82, 84 is allowed to rotate in the direction in which the jaws 94, 94 open.

A guide groove 116 is provided in parallel with the center line C1 on one outer peripheral surface of the slide member 96 parallel to the cylinder center line C1, that is, on the upper outer peripheral surface in FIG. A positioning bolt 118 is arranged on the screw 74 so as to be screwed in the radial direction so that the tip of the screw protrudes from the inner peripheral surface. The guide groove 116 and the positioning bolt 118 are engaged with each other so that the slide bolt is slid. Rotation of the member 96 around the center line C1 relative to the sleeve 74 and the pair of jaws 82 and 84 is prevented. For this reason, the pair of cam rollers 100 always maintain their rotational axes parallel to the pair of cam surfaces 112 and 114. The pin 98, whose both ends are supported by a slide member 96 having a U-shape in FIG. 1, is a stopper provided by being screwed onto the slide member 96 at a right angle to the axis on one side in the axial direction. The bolt 120 blocks relative movement in the axial direction and around the axis. The output rod 54, which is screwed and connected to the slide member 96 in the direction of the cylinder center line C1, is rotated relative to the slide member 96 at a right angle to the center line C1 by a locking bolt 122 provided on the slide member 96. Motion is blocked. In addition, at the screwing position of the sleeve 74 with the outer tube 60, a fixing bolt 124 is screwed at a right angle to the center line C1, and the relative rotation between the sleeve 74 and the outer tube 60 is prevented. Therefore, the members other than the housing 22 and the sub-piston 66 in FIG. 5 are held in a positional relationship in which the mutual angular positions around the cylinder center line C1 are constant.

The leaf spring 90, one end of which is fixed to one jaw 84 by a countersunk screw 126, has its tip end abutted against the other jaw 82 when the compression dies 92 and 94 are closed as shown in FIG. The shape in the unconstrained state is set in advance so that the levers 108 and 110 are always deformed and deformed, and the urging force in the direction in which the lever portions 108 and 110 are separated from each other is always applied. The upper support shaft 80 in FIG. 5 is biased counterclockwise and one jaw 84 is biased clockwise in the lower support pin 80. When the pipe connecting joint 190 as shown in FIG. 9 is set between the pair of compression dies 92 and 94, the lever portions 108 and 110 are sandwiched by fingers and resisted against the biasing force of the leaf spring 90. The compression dies 92 and 94 on the opposite side to the support shaft 80 may be opened by bringing the compression dies 108 and 110 close to each other.

The compression dies 92 and 94 have outer peripheral surfaces 92a and 94a each having a semi-cylindrical shape around the die center line C2 (see FIG. 1) in a closed state thereof, and have a substantially hexagonal shape around the center line C2. Has tool surfaces 92b and 94b for compressing the pipe connection joint 190 and the like. The die center line C2 is formed such that fitting recesses 86a and 88a of the tool mounting portions 86 and 88 that fit with the outer peripheral surfaces 92a and 94a on the side of the pair of jaws 82 and 84 are inclined by an inclination angle α. Therefore, in the state in which the hydraulic cylinder 24 is mounted on the tool mounting portions 86 and 88, the front-back direction of the hydraulic cylinder 24 with respect to the direction perpendicular to the cylinder center line C1 of the hydraulic cylinder 24, that is, the direction parallel to the axial center of the support shaft 80. It is tilted in the left-right direction in FIG. 1 by a tilt angle α.

When the pipe connecting joint 190 and the like are compressed by the inclined compression dies 92 and 94, the pipe connecting pipe is connected with the center line of the pipe connecting joint being aligned with the die center line C2. When the machine 10 is set, the position of the compression processing portion, that is, the support frame 78 and the like relative to the reference plane G shown in FIG. 3 is located at a position retracted upward in the figure corresponding to the inclination angle α. For this reason, for example, when connecting to a pipe that is buried in the floor or the like and has an end protruding, the distance from the floor or the like to the support frame 78 or the like becomes large, and the floor or the like is It will always be located outside the reference plane G of 3. As a result, as shown in FIGS. 13 and 14, even when the pipe protruding from the floor surface or the wall surface is short, the hydraulic cylinder 24 or the support frame 78 does not interfere with the floor surface or the wall surface, and the die center line is prevented. It becomes possible to perform compression processing by aligning C2 with the center line of the pipe.

Further, in FIG. 6 showing the vicinity of the compression dies 92, 94 viewed from above in FIG. 1 in parallel with the die center line C2, concave grooves 128 are formed at both ends of the outer peripheral surfaces 92a, 94a, respectively. The protrusions 130 are provided in parallel with the line C2, and the protrusions 130 are provided in the fitting recesses 86a, 88a of the jaws 82, 84 in parallel with the center line C2 in correspondence with the recessed grooves 128. . The outer peripheral surfaces 92a and 94a are fitted into the fitting recesses 86a and 88a, and the projection 130 is engaged with the recessed groove 128, so that the compression dies 92 and 94 are aligned in a direction parallel to the die center line C2. It is held movable and immovable in the direction perpendicular to the die center line C 2. A pressure ball 132 protruding from the inner peripheral surface of each of the fitting recesses 86a and 88a is disposed in each of the tool mounting portions 86 and 88 so as to be able to be pressed against the biasing force of the compression coil spring 134. The pressing balls 132 are engaged with the recesses 136 formed on the outer peripheral surfaces 92a, 94a of the compression dies 92, 94, so that the compression dies 92, 94 are positioned in a direction parallel to the die center line C2.

By thus guiding the compression dies 92 and 94 in the direction of the die center line C2 and positioning them in that direction, the compression dies 92 and 94 can be inserted and removed in the direction parallel to the die center line C2. It is held by the mounting portions 86 and 88, respectively. Therefore, when installing or removing the compression dies 92, 94, it suffices to push in or push out the compression dies 92, 94 in the direction parallel to the die center line C2. Correspondingly, it is easy to replace a pair of compression dies 92, 94, which are available in multiple types, according to the type of pipe connection joint to be processed at each site. The plurality of types of compression dies 92 and 94 are the same as the detachable compression dies used in the conventional portable pipe connecting machine in which the die center line C2 is perpendicular to the cylinder center line C1.

The pair of compression dies 92, 94 are detached from the jaws 82, 84 by both being retained by a torsion coil spring 138 having a coil portion and a pair of elongated retaining portions. Although the pair does not come apart in the bent state, the torsion coil spring 138 is easily elastically deformed and a certain degree of relative movement is possible between the dies. The work of attaching and detaching to 86, 88 does not become difficult. It goes without saying that a compression die which is not locked by the torsion coil spring 138 may be used.

Next, the operation of the portable pipe connector 10 configured as above will be described.

First, in a state in which the output rod 54 of the hydraulic cylinder 24 is held at the initial position on the retracting side without pressing the switch 16, for example, the tool head 26 is gripped by the hand not gripping the grip portion 14. While supporting the lever, the lever portions 108 and 110 of the pair of jaws 82 and 84 are sandwiched by fingers, and the pair of compression dice 92 and 94 are opened against the biasing force of the leaf spring 90. At this time, the posture of the tool head 26 around the cylinder center line C1 of the hydraulic cylinder 24 is changed as necessary depending on the arrangement direction of the pipe connection joint at the piping site. In this state, the compression processing part of the pipe connecting joint is positioned between the pair of compression dies 92, 94 with the pipe center line and the die center line C2 being aligned with each other. After adjusting the position, when the force of the finger that has opened the pair of jaws 82 and 84 is released, the pipe connection joint is sandwiched between the compression dies 92 and 94 according to the biasing force of the leaf spring 90.

When the switch 16 is pushed in while the positional relationship between the compression dies 92, 94 and the pipe connection joint is properly positioned, the electric motor 18 is operated and the hydraulic pump 28 causes the switching valve 36 to operate. The hydraulic oil is sent under pressure, and the switching valve 36 connects the discharge oil passage 34 and the supply / exhaust oil passage 38 by the hydraulic pressure of the hydraulic oil and shuts off the communication between the supply / exhaust oil passage 38 and the exhaust oil passage 48. The hydraulic fluid pressure-fed from the hydraulic pump 28 flows into the pressurizing chambers 40 and 70 of the hydraulic cylinder 24. As a result, the output rod 54 of the hydraulic cylinder 24 is driven to protrude, the cam roller 100 of the slide member 96 abuts on the cam surfaces 112 and 114 of the pair of jaws 82 and 84, and the compression dies 92 and 94 are closed. Is applied. As a result, the pipe connection joint is compressed between the compression dies 92 and 94. When the compression dies 92 and 94 are completely closed and the pushing operation of the switch 16 is continued, the relief valve 44 is opened by the increase of the hydraulic pressure and is supplied from the hydraulic pump 28. The working oil is released from the branch oil passage 42 to the oil tank 20 via the discharge oil passage 46.

When the pushing operation of the switch 16 is released after the completion of the compression processing of the pipe connection joint, the operation of the electric motor 18 is stopped and the hydraulic oil is not supplied from the hydraulic pump 28 to the switching valve 36. Since the oil passage 48 and the oil supply / discharge passage 38 are communicated with each other, the piston 50 of the hydraulic cylinder 24 is pushed back by the urging force of the compression coil spring 52, and the hydraulic oil in the pressurizing chambers 40, 70 is supplied / exhausted. It is returned to the oil tank 20 through the passage 38 and the discharge oil passage 48. As a result, the output rod 54 and the slide member 96 are returned to the initial positions in FIG. 5, and when the opening operation of the pair of jaws 82 and 84 is allowed again, the pipe connector 10 is moved to the right side in FIG. The tool head 26 is pulled away from the pipe connection joint that has been compressed to finish the work.

Here, in the portable pipe connector 10 of the present embodiment, the die center line C2 in the closed state of the compression dies 92, 94 mounted and held on the tool mounting portions 86, 88 is the hydraulic cylinder. Since the hydraulic cylinder 24 is inclined from the direction perpendicular to the cylinder center line C1 of the cylinder 24 in the front-rear direction of the hydraulic cylinder 24, that is, the left-right direction of FIG. 1, the center line of the pipe should be aligned with the die center line C2. 3, the support frame 78 and the hydraulic cylinder 24 retreat upward in FIG. 3 corresponding to the inclination angle α from the position of the compression processing portion shown by the reference plane G in FIG. It will be placed in the position. Therefore, when compressing a pipe embedded in a floor surface or the like and having an end protruding, even if the pipe has a short protruding dimension from the floor surface as shown in FIGS. 13 and 14, Since the support frame 78 and the hydraulic cylinder 24 do not interfere with the floor surface or the wall surface outside the reference plane G, the pipe connecting joint is not required to dig the floor surface or goug the wall surface as in the conventional case. Can be satisfactorily compressed.

Further, the compression dies 92, 94 having the concave grooves 128 and the concave portions 136 on the outer peripheral surfaces 92a, 94a are formed by the tool mounting portions 86, 88 having the protrusions 130 and the pressing balls 132 in the fitting concave portions 86a, 88a. Is held so that it can be inserted and removed in a direction parallel to the die center line C2, the detachable compression die used in the conventional pipe connecting machine in which the die center line C2 is perpendicular to the cylinder center line C1 is used. However, there is an advantage that the compression dies 92 and 94 can be used as they are.

Further, except for the pair of jaws 82, 84 and the bracket 76, the structure is similar to that of the conventional pipe connecting machine shown in FIGS. 11 and 12. Therefore, by removing the penetrating shaft 106, the die center line C2 is It is also possible to attach and use a conventional jaw configured so as to be perpendicular to the cylinder center line C1.

Next, another embodiment of the present invention will be described. FIG. 7 is a front view showing a part of a portable pipe connector equipped with a tool head 150 of a mode different from that of the tool head 26 in the above-described embodiment. In this tool head 150, a support frame 158 is constituted by a sleeve 152 and a pair of brackets 154 and 156 integrally fixed to the sleeve 152, and a cylinder center line is formed by the pair of brackets 154 and 156. A pair of jaws 162 (not shown) and 164 are rotatably provided around a support shaft 160 held at a right angle to C1. Although illustration is omitted, in the sleeve 152, a slide member fixed to the output rod of the hydraulic cylinder and a pair of cam rollers are disposed in the sleeve 152, and the output rod is driven to protrude. As a result, a force in the closing direction is applied to the pair of jaws 162,164.

The pair of jaws 162, 164 has a plate thickness larger than that of the pair of jaws 82, 84 in the above-described embodiment, and the tool mounting portion 166 on the tip side of the jaw 164 has the above-mentioned fitting within the plate thickness. Similar to the fitting recess 84a, the fitting recess 166a is formed by inclining by a predetermined inclination angle α, and the lower surface 168 of the tool attachment portion 166 is upwardly inclined at the inclination angle α toward the tip side. Inclined to. The plate thickness t1 of the jaw 164 is dimensioned in the direction perpendicular to the cylinder center line C1 necessary for providing the tool mounting portion 166 in such an inclined manner. Therefore, the compression die 94 attached to the tool attachment portion 166 is held by being inclined by the inclination angle α from the direction in which the die center line C2 is perpendicular to the cylinder center line C1. This structure is the same for the other jaw 162 side. The fitting recess 166 and the like are provided with the ridges 130, the pressing balls 132, and the compression coil springs 134 (all are not shown) as in the above-described embodiment.

Also in this embodiment, since the die center line C2 is inclined by the inclination angle α from the direction perpendicular to the cylinder center line C1, the same effect as the above-mentioned embodiment can be obtained. Further, since the pair of jaws 162, 164 of this embodiment is made of a steel material or the like having a plate thickness t1 that can be inclined by the inclination angle α to form the tool mounting portion 166 and the like, the pair of jaws 82, 164, The manufacturing process is simpler than 84, and there is an advantage that it can be configured at a relatively low cost.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above-described embodiment, the case where the inclination angle of the die center line C2 of the compression dies 92 and 94, that is, the inclination angle α of each tool attachment portion is set to about 20 ° has been described. It can be appropriately changed according to the positional relationship between the compression die and the support frame or the hydraulic cylinder, the support frame and the diameter of the hydraulic cylinder, and the like. In that case, it does not matter if the support frame or the like slightly protrudes from the reference plane G as shown in FIG. Further, in addition to the front-rear direction of the hydraulic cylinder, it is also possible to incline the die center line C2 around the cylinder center line C1, that is, in the front-back direction of the paper surface in FIG.

Further, the tool mounting portion 86 and the like in the above-described embodiment correspond to the cylindrical outer peripheral surface 92a and the like of the compression die 92 and the like, the groove 128 and the recess 136, and the fitting recess 86a and the protrusion 130. Although the die holding mechanism including the pressing ball 132 and the compression coil spring 134 was provided, it is possible to form another holding mechanism that removably holds the die in the direction of the center line C2 by various known means. . Further, it is possible to additionally provide a stopper or the like for preventing the die from coming off in one direction of the center line C 2.

Further, in the above-described embodiment, as is apparent from FIG. 1, the compression dies 92 and 94 are held at the positions where the cylinder center line C1 and the die center line C2 intersect with each other. Alternatively, as in the conventional example of FIG. 12, it may be configured to be held at a position offset from the cylinder center line C1.

Further, in the above embodiment, the compression dies 92, 94 are of a die exchange type in which the jaws 82, 84 and the like are attachable / detachable, but the compression dies are integrally formed in the pair of jaws. The present invention can be similarly applied to the portable pipe connecting machine which is used.

Further, in the above-described embodiment, the outer tube 60 is rotatable with respect to the inner tube 58 and cannot be pulled out by the wire 72. However, other connecting means for connecting both of them so as to be rotatable and unable to be pulled out is adopted. It is possible to connect the inner tube 58 and the outer tube 60 so that they cannot rotate relative to each other.

In the embodiment of FIG. 2 described above, the hydraulic pump 28 is driven by the electric motor 18 which uses the battery in the battery housing portion 12 as a power source, but as shown in FIG. A plug 174 connectable to an external power source and a grip 174 extending from the cord 172, a switch 176 for turning the power source on and off, and an electric motor 178 rotated by the power source are provided in the pump 28. You may comprise a drive means. As in the device described in Japanese Patent Laid-Open No. 63-26226, a hydraulic pressure generating unit such as a hydraulic pump can be configured separately.

In addition, a notch having a substantially V shape is provided at the tips of the tool attachment portions 86 and 88 of the pair of jaws 82 and 84, and the notches having a substantially V shape are provided so as to be pressed against the pipe connection joint. Alternatively, the jaws 82, 84 can be opened so that the pipe connection joint is sandwiched between the compression dies 92, 94.

In addition, when the pair of jaws 82 and 84 are connected to the output rod 54 by a link and the output rod 54 is driven to extend and retract, the pair of jaws 82 and 84 are connected to a single support shaft. The present invention can be similarly applied to the case where the present invention is arranged so as to be rotatable around.

Further, in the above embodiment, the single-acting hydraulic cylinder 24 is used in which the output rod 54 is held at the initial position on the retracting side by the urging force of the compression coil spring 52 when the hydraulic pressure is not applied. However, it is also possible to use a double-acting hydraulic cylinder in which the output rod is caused to protrude and retract by the selective supply of hydraulic oil.

Although not illustrated one by one, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a main part of a portable pipe connector according to an embodiment of the present invention.

2 is a plan view of the portable pipe connector of FIG. 1. FIG.

FIG. 3 is a front view showing a portion of the portable pipe connector of FIG. 1 that is closer to the tip than the hydraulic cylinder.

FIG. 4 is a circuit diagram of a hydraulic circuit provided in the portable pipe connector of FIG.

5 is a partial cross-sectional view showing in detail a hydraulic cylinder of the portable pipe connector of FIG. 1 and a portion on the tip side of the hydraulic cylinder.

6 is a plan view of the vicinity of the compression die of the portable pipe connector of FIG. 1 viewed from the die center line direction.

FIG. 7 is a view showing another embodiment of the present invention, and is a front view showing a portion of a mode different from the embodiment of FIG.

FIG. 8 is a plan view showing still another embodiment of the present invention.

FIG. 9 is a view showing an example of a pipe connecting joint which is compression processed by a pipe connecting machine.

10 is a cross-sectional view illustrating a state after compression processing of the pipe connection joint of FIG.

FIG. 11 is a view for explaining an example of a conventional portable pipe connecting device together with FIG. 12, and is a front view showing a partial notch of a main part on the front end side.

FIG. 12 is a view for explaining an example of a conventional portable pipe connector together with FIG. 11, and is a plan view showing a partial cutaway of a main part on the tip side.

FIG. 13 is a diagram illustrating a state in which another pipe is connected to a pipe that is buried under the floor and has an end protruding from the floor through a pipe connection joint.

FIG. 14 is a diagram illustrating a state in which another pipe is connected to a pipe embedded in a wall and having an end protruding from the wall surface through a pipe connection joint.

[Explanation of symbols]

 10: Portable pipe connector 24: Hydraulic cylinder 54: Output rod 78, 158: Support frame 80, 160: Support shaft 82, 84, 162, 164: Jaw 92, 94: Compression die 190, 238, 246: Pipe connection Joint C1: Cylinder center line C2: Die center line

Claims (1)

[Scope of utility model registration request] 1. A support frame integrally provided on the hydraulic cylinder so as to extend to the front of the hydraulic cylinder, and the support frame is rotatable about a support axis perpendicular to the cylinder center line of the hydraulic cylinder. And a pair of jaws for compressing a predetermined pipe connection joint by the compression dies so that the compression dies on the tip side are closed and driven so as to approach each other by the output rod of the hydraulic cylinder protruding or retracting. A portable pipe connector comprising: a compression die, wherein a center line of the die in a closed state is inclined in a front-rear direction of the hydraulic cylinder from a direction perpendicular to the center line of the cylinder. Pipe connecting machine.