JPS6110977Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp device for clamping and fixing a pipe or a pipe joint made of synthetic resin such as polyethylene and having a perfect circle in cross section perpendicular to the axis of the outer periphery.

Conventionally, when heat-sealing with synthetic resin pipes, etc.
When fixing synthetic resin pipe fittings, the pipe fittings are tightened using a clamping device that can be opened and closed around an axis parallel to the axis of the pipe fitting and has an inner circumference that contacts almost the entire circumference of the pipe fitting. It is fixed. In such a clamp device, if the clamping force of the clamp device is increased in order to securely fix the pipe joint, there is a risk that the pipe joint will collapse and become flat. Moreover, the axes of the pipe joints are not always located at the same position, and therefore the work of centering the pipe joints is complicated.

The present invention is a clamping device that can reliably grip synthetic resin pipes or pipe fittings while keeping them almost perfectly circular, and also maintains the axis of the pipe or pipe fitting in the same position at all times, making centering work easier. The purpose is to provide

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a fusion splicer showing an embodiment of the present invention, and FIG. 2 is a plan view with the pipe 1 and pipe joint 2 of FIG. 1 omitted. Base 3 of this fusion machine
A pair of round rod-shaped guide members 4 and 5 having parallel axes within one plane are fixed to the. This guide member 4,
5, a clamping device 6 and a clamping device 7 according to the present invention are provided so as to be movable toward and away from each other. When socket-joining a pipe 1 made of a thermoplastic synthetic resin, such as polyethylene, and a pipe fitting 2 made of a thermoplastic synthetic resin, the clamp device 6 grips the end of the pipe 1, and the clamp device 7 clamps the pipe. Grip the joint 2. Next, after heating the outer circumferential surface of the end of the pipe 1 and the socket of the pipe fitting 2 with a heater (not shown), the pipe 1 is moved toward the pipe fitting 2 and the socket connection between the pipe 1 and the pipe fitting 2 is achieved. .

FIG. 3 is a sectional view taken along the section line - in FIG. 1. The clamping device 6 includes a base body 10 having guide holes 8 and 9 through which guide members 4 and 5 are inserted, and upper and lower halves 1 integrally provided on the base body 10.
3 and 14. The half piece 14 is integrally supported by the base body 10. One end of the halves 13, 14 is mutually supported by hinge pins 15, 16 whose axes are parallel to the guide members 4, 5. The other ends of the half pieces 13 and 14 can be fixed to and separated from each other by a lock piece 17. This lock piece 17 has a long hole 11 extending vertically.
is formed, and a pin 12 that is engaged with the elongated hole 11 is provided protruding from the half piece 13. Half piece 14
A pin 18 is provided protrudingly parallel to the guide members 4 and 5, and an engaging portion 17a that engages with the pin 18 is formed at the lower part of the lock piece 17. Engagement part 17
A is engaged with the pin 18, and the half pieces 13 and 14 are tightened and fixed on the outer periphery of the tube 1 by screwing the threaded rod 19 with the lock piece 17 in the vertically extending position as shown in FIG. be able to. When the engaging portion 17a of the locking piece 17 is removed from the pin 18, the two halves 13 and 14 are unlocked.

Liners 82 and 83 are removably attached to the inner peripheries of the half pieces 13 and 14, respectively, and are in contact with substantially the entire outer periphery of the tube 1. Put half pieces 13 and 14 into tube 1
The contact surfaces 82a, 83a of the liners 82, 83 form approximately perfect circles when properly tightened and fixed to the outer periphery of the liners 82, 83. By preparing liners 82 and 83 of various sizes, pipes 1 of various sizes can be fixed with the clamp device 6.

FIG. 4 is a sectional view taken along the section line - in FIG. 1. The clamping device 7 includes a base body 29 having guide holes 27 and 28 through which the guide members 4 and 5 are inserted.
and a pair of clamping members 3 attached to the base body 29 and movable in the lateral direction perpendicular to the axes of the guide members 4 and 5.
0, 31, and a driving means 32 for moving the clamping members 30, 31 toward and away from each other by the same distance.

On the inner periphery of the clamping member 30, arc-shaped contact surfaces 84a and 84b that contact the outer peripheral surface of the pipe joint 2 are formed at intervals in the circumferential direction through a recess 60 that is recessed outward in the radial direction. A liner 84 is removably provided. Also, on the inner periphery of the clamping member 31, a pipe joint 2 is provided.
Arc-shaped contact surfaces 85a, 85 that contact the outer peripheral surface of
Liners 85 formed at intervals in the circumferential direction are removably provided through the recesses 61 which are recessed outward in the radial direction. When both the clamping members 30, 31 are fixed to the outer periphery of the pipe joint 2 as shown in FIG. Note that by preparing liners 84 and 85 of various sizes, pipe joints 2 of various sizes can be fixed with the clamp device 7. Furthermore, if the pipe fitting 2 has a large diameter, the liners 84 and 85 can be omitted, and in preparation for this, the inner circumferences of the clamping members 30 and 31 are provided with contact surfaces 30a that abut against the outer circumference of the pipe fitting 2. ,3
0b: 31a and 31b are formed through depressions 86 and 87, respectively.

FIG. 5 is a perspective view of the base body 29. Guide grooves 33 and 34 extending perpendicularly to the axes of the guide holes 27 and 28 are formed in the upper part of the base body 29, respectively, in a straight line except for the center portion in the width direction (left and right direction in FIG. 4). A support wall 3 is provided in the center between the guide grooves 33 and 34.
5 and 36 are provided upright at intervals in the longitudinal direction of the guide grooves 33 and 34. The lower portions of the clamping members 30 and 31 are respectively fitted into the guide grooves 33 and 34,
Thereby, the clamping members 30 and 31 are connected to each guide groove 3.
It can be moved freely by being guided by 3 and 34.

The guide groove 3 is provided at the lower part of the clamping members 30 and 31.
Through holes 37 and 38 extending in the longitudinal direction of 3 and 34 are drilled with the same axis. Each guide groove 3
Through holes 39 and 40 having the same axes as the through holes 37 and 38 are bored in the support walls 35 and 36 at 3 and 34, respectively. A guide tube 4 is provided at a side part of the clamping members 30 and 31 that is far from the axis of the pipe joint 2.
1 and 42 are fixed. Those guide tubes 41, 4
2 is provided with internal threads 43 and 44, and the guide cylinder 4 is inserted from the clamping members 30 and 31 so that the internal threads 43 and 44 are on the same axis as the through holes 37 and 38.
1 and 42 are provided protrudingly. In addition, the internal threads 43, 44
are carved in mutually opposite directions; for example, when the internal thread 43 is a right-handed thread, the internal thread 44 is a left-handed thread.

Support plates 45 and 46 are fixed to both sides of the base body 29, respectively. Support holes 47 and 48 are formed in these support plates 45 and 46, respectively, to support the guide tubes 41 and 42 so as to be movable in their axial directions.

The driving means 32 has both ends screwed into internal threads 43, 44 of the guide cylinders 41, 42, and has through holes 37, 39, 4.
A drive rod 49 that rotatably passes through the holes 0 and 38, and a support wall 3 at the center of the drive rod 49 in the axial direction.
The handle 52 includes blocking members 50 and 51 that are fixed between the drive rods 5 and 36 to prevent movement of the drive rod 49 in the axial direction, and a handle 52 that is detachably attached to one end of the drive rod 49 in the axial direction. Rectangular projections 53 and 54 for mounting a handle 52 are provided at both ends of the drive rod 49, respectively.

When the handle 52 is rotated in one direction around the axis of the drive rod 49, the clamping members 30 and 31 move close to each other or close to each other along the guide grooves 33 and 34 because the internal threads 43 and 44 have opposite threads. They are separated, and the distance traveled is the same.

One end of a guide plate 55 extending in the same direction as the drive rod 49 is supported at the upper end of the clamping member 30 so as to be movable in the longitudinal direction. The other end of the guide plate 55 is fitted into a groove 57 formed at the upper end of the clamping member 31 . The groove 57 is formed along the longitudinal direction of the guide plate 55, and the groove 57 is formed on the side wall of the groove 57.
A long hole 58 extending in the longitudinal direction is formed. A pin 59 is provided protruding from the other end of the guide plate 55, and the pin 59 is engaged with the elongated hole 58. Therefore, by the driving operation of the driving means 32, the clamping members 30, 31
can move toward or away from each other.

Pivot shafts 62 to 65 are erected on both left and right sides of the base body 10 in the clamp device 6 (upper and lower in FIG. 2) and on the support plates 45 and 46 of the clamp device 7. These pivots 62 to 65 are connected to the guide member 4,
It projects outward at right angles to the axis of 5. Levers 66-69 are supported on these pivots 62-65. One end of each lever 66, 68: 67, 69 located on the same side of the clamping device 6 and the clamping device 7 (ie, above or below in FIG. 2) is rotatably supported by both ends of an interlocking rod 70, respectively.
This interlocking rod 70 is located below the guide members 4, 5 and has an axis perpendicular to the axes of the guide members 4, 5.

Referring to FIG. 3, a recess 71 is formed at the upper end of the lever 66. As shown in FIG. This recess 71 has a handle 73 having a protrusion 72 that can fit into the recess 71.
is installed. By tightening the thumbscrew 74 having an axis parallel to the interlocking rod 70, the protrusion 72 fitted in the recess 71 can be fixed, and the handle 73 can be specifically fixed to the lever 66. The remaining levers 67, 68, and 69 are also constructed in the same manner as the lever 66 described above, and a handle 73 is detachably attached to the levers 73 by thumbscrews 74.

The base body 29 of the clamping device 7 has an internal thread 75.
(See FIG. 5) is engraved, and a screw member 76 is provided on the body 3 3a to be screwed into the internal thread 75 thereof. By screwing this screw member 76 into the internal thread 75, the guide member 4 of the clamp device 7,
5 is prevented.

When gripping the end of the tube 1 with the clamp device 6, open the half piece 13 and hold the tube 1 with the half piece 1.
Place it on top of 4. Thereafter, the outer periphery of the tube 1 is fixed by tightening the two halves 13 and 14 with the locking piece 10. In order to grip the pipe joint 2 with the clamp device 7, the drive rod 49 is rotated in one direction by the handle 52 to separate the clamping members 30 and 31 from each other. Thereafter, with the pipe joint 2 disposed between the clamping members 30 and 31, the drive rod 49 is rotated by the handle 52 in a direction opposite to the one direction. Then, both the clamping members 30, 31 are moved closer to each other by the same distance, and the respective contact surfaces 84a, 8
4b, 85a, and 85b abut against the outer periphery of the pipe joint 2, thereby fixing the pipe joint 2.

When the pipe joint 2 is fixed, both clamping members 3
0, 31 contact surfaces 84a, 84b, 85a, 85
b indicates the pipe fitting 2 at intervals in the circumferential direction of the pipe fitting 2.
, the contact area between the pipe joint 2 and both clamping members 30 and 31 is small. Moreover, the contact surfaces 84a, 85a: 84b, 85b are opposed to each other. Therefore, even if both the clamping members 30 and 31 are strongly tightened, the pipe joint 2 is prevented from becoming flat as much as possible. Moreover, both clamping members 30, 31
are moved toward and away from each other by the same distance, so even if the outer diameters of the pipe joints 2 sandwiched between them are slightly different, the axes of the pipe joints 2 are always at the same position. Therefore, the work of aligning the pipe 1 and the pipe joint 2 becomes easy.

After gripping the pipe 1 and the pipe fitting 2 with the clamp devices 6 and 7, the upper protrusion 7 of the clamp device 6
7 and a protrusion 78 protruding from the guide plate 55, a heater (not shown) is applied to heat the outer surface of the end of the tube 1 and the socket of the pipe joint 2. Thereafter, the handle 73 is rotated in the direction of arrow 79. Then, the levers 66 and 67 rotate around the interlocking shaft 70, and the pivots 62 and 63 also rotate.
In addition, the levers 68 and 69 rotate and the clamp device 6
is displaced toward the clamping device 7. In this way, the socket connection between the pipe 1 and the pipe joint 2 is achieved.

Although the above-mentioned practical example was explained in relation to the pipe joint 2, the clamp device 7 can also clamp a pipe.
Furthermore, the present invention can be widely implemented not only as a fusion splicer but also as a clamp device for pipes or pipe joints.

As described above, according to the present invention, since the pipe or pipe joint is held between the pair of holding members having arc-shaped abutment surfaces spaced apart in the circumferential direction of the synthetic resin pipe or pipe joint, the pipe or pipe joint can be clamped. Alternatively, the pipe joint is prevented from being flattened as much as possible. Moreover,
Since both of the clamping members are moved toward and away from each other by the same distance by the driving means, the axis of the pipe or pipe joint can always be positioned at the same position, which facilitates centering work. .

[Brief explanation of the drawing]

Fig. 1 is a front view showing a fusion splicer according to an embodiment of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a sectional view taken from the cutting plane line - of Fig. The figure is a sectional view taken along the cutting plane line - in FIG. 1, and FIG. 5 is a perspective view of the base body 29. 2... Pipe joint, 30, 31... Clamping member, 30
a, 30b, 31a, 31b, 84a, 84b,
85a, 85b... contact surface, 32... drive means.

Claims (1)

[Scope of Claim for Utility Model Registration] A synthetic resin pipe whose outer circumference to be clamped has a perfectly circular cross section perpendicular to its axis or a pipe fitting having arc-shaped abutting surfaces spaced apart in the circumferential direction and abutting the outer circumference of the pipe joint. ,
A pair of clamping members that are movable toward and away from each other in a direction perpendicular to the axis of the pipe or pipe joint; and a driving means that moves the clamping members toward or away from each other by the same distance along the direction of movement. A clamp device featuring: