JPS6245878Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a device for connecting pipes such as plastic pipes and sockets, in particular a guide rail having a certain length, and a pair of clamp mechanisms for holding the pipes in the rail length direction. The present invention relates to a plastic pipe connecting device which is movably fitted, has a heater holder disposed between both clamp mechanisms, and allows the heater holder to be retracted from between both clamp mechanisms.

Generally, in this type of connection device, heater attachments are attached to both sides of the heater holder, the ends of the pipes are pressed against the heater attachments with a certain pressure to heat and melt, and then the pipes are held together at a certain pressure. They are bound together by pressure. Particularly in the above device for connecting pipes having a large diameter, for example, 30 mmφ or more, each clamp mechanism is equipped with, for example, a manual toggle mechanism in order to press the pipes with a constant pressure.

However, in the conventional toggle mechanism, the movement start positions of both clamp mechanisms are fixed, which causes the following problems.

(1) In general, there are socket methods and butt joint methods (end surface connection methods) for connecting pipes, but there are large differences in the amount of movement required for the clamp mechanism depending on each method. For example, while the socket method requires a long travel distance,
The distance required for the butt joint method is short. However, if the movement start position of the clamp mechanism is fixed as described above, in the butt joint method, the clamp mechanism must be moved a longer distance than necessary, and the operation of the toggle mechanism is time-consuming.

(2) Regardless of the connection method used, when fitting or end-joining pipes after heating and melting, the clamp mechanism must be moved a longer distance than during heating and melting, and the toggle mechanism It takes time to operate.

The present invention solves the above problem by equipping the toggle mechanism of at least one of the clamp mechanisms with a stroke change mechanism that can change the movement start position toward the heater holder and the other clamp mechanism. It is intended to make it easier. The present invention will be explained below based on the drawings.

In FIG. 1, which is an overall side view of a connecting device to which the present invention is applied (arrow F points toward the front), 1 is a truck with a pair of front wheels 2 and a pair of rear wheels 3 each on the lower side of the front and rear ends. We are prepared. The front wheel 2 is a turnable wheel with a brake, a so-called caster. On the upper surface of the truck 1, a front bracket 5 for supporting the guide rail is fixed to the front part, a rear bracket 6 for supporting the guide rail is fixed to the rear part, and a bracket 7 for supporting the heater holder is fixed to the middle part of the front and back width. There is.
The bracket 7 is fixed, for example, to the right end portion of the truck 1, as shown in FIG.

Two guide rails 8 extending in the front-rear direction are fixed to the front and rear brackets 5 and 6, and the rails 8 have a circular cross-section. First and second clamps 10 and 11 for holding pipes are fitted to both the front and rear ends of the rail 8 so as to be movable in the length direction of the rail, but not rotatable around the rail, and the upper end of the bracket 7 is fitted to hold pipes. Heating heater holder 1
2 are provided. Reference numeral 13 denotes a bellows that covers the outer peripheral surface of the rail 8, and its both ends are connected to each clamp 10,
It is fixed to 11.

The first clamp 10 consists of a lower holder 14 and an upper holder 15, as shown in FIG. Part 1
4a is fitted to the rail 8 via the ball bush 16. The boss portion 14a has a butterfly bolt 14b that can lock the lower holder 14 to the rail 8.
are screwed together. An upwardly opening semicircular recess 17 is formed on the upper surface of the lower holder 14.
A downwardly opening semicircular recess 18 facing the recess 17 is formed on the lower surface of the recess 17, and the inner peripheral surfaces of both recesses 17 and 18 are provided with dovetail-shaped projections 17a and 18a along the circumferential direction. is formed. Yes 17
The dovetail grooves 19a (FIG. 1) of the half-split sleeve 19 are fitted into each of a and 18a along the circumferential direction, and this dovetail groove connection allows the sleeve 19 to fit into the recess 1.
It is attached to the inner peripheral surfaces of 7 and 18. Further, the upper half-shaped sleeve 19 is locked by a lock bolt 20 and a nut 21 so as not to move in the circumferential direction. One end of the upper holder 15,
For example, the right end in FIG. 2 is rotatably supported by the upper right end of the lower holder 14 via a horizontal pin 23, so that the upper holder 15 can be opened in the direction of arrow A.

A horizontal pin 2 is attached to the upper left end of the lower holder 14.
A tightening bolt 25 is rotatably supported around a pin 24 via a bolt 4, and a tightening nut 26 is screwed into the tip of the tightening bolt 25. On the other hand, the free end (left end) of the upper holder 15 is formed with a left-opening groove 27 for inserting a tightening bolt. That is, after rotating the tightening bolt 25 in the direction of arrow B to the state shown in FIG. 2, the nut 26 is tightened to tighten the pipes inserted into the sleeve 19,
Hold. The sleeve 19 is available in various inner diameters and can be replaced depending on the pipe size.

The second clamp 11 (FIG. 1) has the same structure as the first clamp 10, and the lower holder 34
and an upper holder 35. Regarding the parts corresponding to each part of the first clamp 10, both holders 34 and 35 and the sleeve 19' (FIG. 3)
The same numbers as in the case of the first clamp 10 are given except for. However, 34a is a boss portion, and 34b is a lock wing bolt. Further, the sleeve 19' has a longitudinal width d (FIG. 1) shorter than that of the sleeve 19 of the first clamp 10 so that a pipe with a short gripping width, such as an elbow pipe, can be attached thereto. For example, it is half the width.

The second clamp 11 is equipped with a pipe auxiliary holder 37, as shown in FIGS.
Even pipes with short gripping allowances, such as elbow pipes and T-shaped pipes, can be held securely.

To explain the auxiliary holder 37 in detail, the lower holder 34 of the second clamp 11 (FIG. 1)
A pair of left and right guide shafts 38 extending rearward are fixedly attached to the guide shafts 38, and a slider 40 is fitted onto the guide shafts 38 via a ball bushing 39. A connecting plate 43 is fixed to the rear end portions of both guide shafts 38 with bolts 42 . The slider 40 is fitted onto the guide shaft 38 so as to be movable in the lengthwise direction of the guide shaft but not rotatable around the guide shaft. A screw shaft 41 (FIG. 3) for moving the slider is arranged between both guide shafts 38 and parallel to the guide shaft 38. The front end of the screw shaft 41 is supported by the lower holder 34 so as to be immovable in the shaft length direction and rotatable around the shaft.
It is screwed into the female screw hole of 0. Screw shaft 41
The rear end portion is rotatably supported by a connecting plate 43 and extends rearward, to which a handle 44 is fixed. That is, by rotating the screw shaft 41 clockwise or counterclockwise via the handle 44, the slider 40 can be moved forward or backward. As shown in FIG. 3, the slider 40 is provided with a pair of left and right elbow tube support plates 45, 46, and a stopper plate 47 for supporting the support plates 45, 46. slider 40
A pair of upward brackets 48 are formed at both left and right ends of the screw shaft 41. A horizontal support shaft 49 perpendicular to the screw shaft 41 is fixed to both brackets 48, and the elbow tube support plates 45, 46 are mounted on this support shaft 49.
are each rotatably supported. The stopper plate 47 is fixed to the rear end edge of the bracket 48, and has an upwardly opening arcuate portion 47a on the upper surface of the center portion of the left and right width. The stopper plate 47 is attached to the elbow pipe support plates 45 and 46.
The elbow tube support plates 45 and 46 are held in an upright position as shown by solid lines in FIG. Reference numeral 50 designates lock bolts screwed onto both brackets 48, and by tightening the lock bolts 50, the elbow support plates 45, 46 are reliably held in the state shown by solid lines in FIG.

When fixing the elbow tube to the second clamp 11, at least one of the elbow tube support plates 45 and 46 is placed in an upright state. For example, in the case of an elbow pipe that bends to the left in FIG. 3, at least the plate 45 on the left side is kept upright, and by turning the handle 44 and advancing the slider 40, the plate 45 is bent to the left of the elbow pipe. Press firmly to hold the elbow tube. When fixing the T-shaped tube to the second clamping machine 11, both elbow tube support plates 45 and 46 are placed in an upright state. In addition, when attaching a long pipe to the second clamp 11, both plates 4
5 and 46 are brought forward.

As a mechanism for driving both clamps 10, 11 in the length direction of the guide rail, manual toggle mechanisms 52, 5 are provided for each clamp 10, 11 as shown in FIG.
3 are provided. The toggle mechanism 53 of the second clamp 11 consists of two upper and lower links 55 and 56 and a torque wrench 57, and the lower end of the lower link 56 is supported by the rear bracket 6 via a horizontal pin 58. At the same time, the front upper end is the upper link 5
5 via a pin 59 so as to be rotatable. Rear upper end boss portion 55a of upper link 55
is a horizontal pin 60 fixed to the lower holder 34.
It is rotatably supported. torque wrench 57
The lower end portion is fixed to the upper link boss portion 55a, and rotates integrally with the upper link 55. That is, by pulling up the torque wrench 57, the second clamp 11 is moved forward, and by pushing down the torque wrench 57, the second clamp 11 is moved backward. A downward bracket 61 is formed at the lower end of the lower holder 34, and a ratchet pawl 63 is rotatably supported on the bracket 61 via a horizontal pin 62. A ratchet 64 having a number of forwardly raised protrusions that can be freely engaged with the ratchet 63 is fixed thereto. That is, by tilting the ratchet claw 63 forward, the ratchet 64
By engaging with the second clamp 11, the second clamp 11 is locked in an appropriate position so as to be unable to move backward. 65 is a bolt for stopping the ratchet pawl, and this bolt 65
By tightening the ratchet pawl 63, the ratchet pawl 63 can be held in the unused state as shown in FIG. Note that a push rod and a spring are provided in place of the bolt 65, so that the push rod presses and holds the ratchet pawl 63 in an upright state due to the elastic force of the spring, and the holding state can be released by pushing the push rod. Good too.

The toggle mechanism 52 for the first clamp 10 is
It consists of lower links 66, 67, a torque wrench 68, etc., and the second clamp toggle mechanism 53
It has almost the same structure with the front and back reversed. 66
a is an upper link boss portion, and 69, 70, and 71 are pins. That is, by pulling up the torque wrench 68, the first clamp 10 is moved backward with a strong force, and by pushing it down, the first clamp 10 is moved forward.

The first clamp toggle mechanism 52 includes a first
A stroke change mechanism is provided that can change the retraction (reverse) start position of the clamp 10. That is, the front bracket 5 has a plurality of pin support holes X ₁ , X ₂ ,
X ₃ is formed, and each pin support hole X ₁ , X ₂ , X ₃
The upper end portions of the two are connected to each other by a guide groove _X0 .
_Each of _{the support} holes _{X 1 ,} It is designed to be selectively fixedly supported. The pin 71 that supports the lower front end of the lower link 67 is
As shown in FIG. 2, it includes a handle portion 71a and a small-diameter male thread portion 71b, and a nut 72 is screwed into the male thread portion 71b. That is, by tightening the front bracket 5 between the right side step of the large diameter portion 71c of the pin 71 and the nut 72, the pin 71 can be fixedly supported in any of the support holes _X1 , _X2 , and _X3 . .

In FIG. 4, the heater holder 12 has an electric heater with a temperature controller inside. The right end of the heater holder 12 in FIG. 4 is rotatably supported by the bracket 7 via a horizontal pin 73, and by rotating it in the direction of arrow b from the use position shown in FIG. 11 (Fig. 1).

On both the front and rear sides of the heater holder 12 (FIG. 1), there are first and second holes 75 and 76 for heater attachments having the same inner diameter centered on the center line 0 of the circle, and first and second holes respectively. Connector parts 75a and 76a are formed centered on the center line 0 and communicate with 75 and 76, respectively. A plurality of (for example, four) attachment holding protrusions 7 are provided at the peripheral edge of the second hole 76.
7 are formed on the side surface of the holder 12 at equal intervals in the circumferential direction on the same circumference as shown in FIG. Each protrusion 77 extends further toward the hole center than the periphery of the second hole 76 . There are also two upper and lower protrusions 7.
An attachment pressing screw 78 is screwed into the center 0 portion of 7. The periphery of the first hole 75 is also provided with a plurality of protrusions 77 having a structure similar to that of the second hole 76 described above.

The first and second heater attachments 81 and 82 attached to both sides of the heater holder 12 are formed with flanges 81a and 82a that can be fitted with the spigot parts 75a and 76a. At the outer peripheral end of the flange 82a in FIG.
is formed. 1st heater attachment 8
A notch 84 similar to the second heater attachment 82 is also formed in the first flange 81a. Note that since both the pilot parts 75a and 76a have the same inner diameter, naturally the outer diameters of both the flanges 81a and 82a are also the same.

When attaching the second heater attachment 82, each notch 84 is
are aligned with each protrusion 77, the flange 82a is inserted into the second hole 76 and fitted into the pilot part 76a, and then the flange 82a is inserted in the direction of arrow G, for example.
2a and rotate the flange 82a by the protrusion 77.
to lock. Further, in order to improve the heat conduction efficiency from the heater holder 12 to the second heater attachment 82, the flange 82a is strongly pressed against the heater holder 12 by each screw 78.

When removing the second heater attachment 82, first loosen each screw 78, and then move the flange 82a in the opposite direction of arrow G (or arrow G) until the notch 84 moves from the solid line position to the imaginary line position in FIG. Then, the flange 82a is removed from the hole 76, etc.

The first attachment 81 is also attached and detached in the same manner as the second attachment 82.

The first attachment 81 (FIG. 1) is formed into a cylindrical shape and has a cylindrical portion 81c inside. That is, by using the outer circumferential surface of the cylindrical portion 81c and the outer circumferential surface of the outer circumferential wall, the inner circumferential surface of the pipe corresponding to these outer circumferential surfaces can be heated and melted, and the inner circumferential surface of the outer circumferential wall can be used. As a result, it is possible to heat and melt the outer circumferential surface of a pipe P having a size as shown by the imaginary line in FIG.

The second attachment 82 has a cylindrical shape, and its outer circumferential surface can be used to heat and melt the inner circumferential surface of the socket S as shown by the imaginary line in FIG. The inner circumferential surface can be used to heat and melt the outer circumferential surface of pipes of different sizes.

The first and second heater attachments 81, 8
Reference numeral 2 is an attachment used for connection using the socket joint method, but when connecting pipes using the butt joint method (end surface connection method), a disk-shaped attachment is used as shown in Figure 5. 87 is used. Of course, this attachment 87 is also provided with a flange 87a similar to the first and second heater attachments 81 and 82, and a notch 88 corresponding to the protrusion 77 (FIG. 4) is formed in the flange 87a. This attachment 8
The attachment/detachment method of 7 is the same as that of the first and second heater attachments 81 and 82.

Next, the operation of the entire connection device will be explained. When connecting a pipe P and, for example, a socket S, the pipe P is fixed to the first clamp 10, the socket S is fixed to the second clamp 11, and the first
The pin 71 of the clamp toggle mechanism 52 is held in the frontmost support hole _X1 . Next, by pulling up the torque wrench 68 of the first toggle mechanism 52, the pipe P is moved backward together with the first clamp 10, and the outer peripheral surface of the pipe P is aligned with the inner peripheral surface of the outer peripheral wall of the first heater attachment 81. The torque wrench 5 of the second toggle mechanism 53
7, the socket S is moved forward together with the second clamp 11, and the socket S
The inner circumferential surface of the second heater attachment 82 is fitted to the outer circumferential surface of the second heater attachment 82 with a constant pressure. With the pipe P and socket S fitted into the first and second heater attachments 81 and 82, respectively, and pressed together, both clamps 10 and 11 are locked with wing nuts 14b and 34b, and heat from the heater holder 12 is removed. The outer circumferential surface of the pipe P and the inner circumferential surface of the socket S are heated, for example, for one minute, to melt them.

After heating and melting, loosen the wing nuts 14b and 34b,
The first clamp 10 is moved forward and the second clamp 11 is moved backward to remove the pipe P and socket S from each attachment 81,82.

Thereafter, the heater holder 12 is retracted in the direction of arrow D in FIG. 4, and the pin 71 of the first clamp toggle mechanism 52 is supported in, for example, the third support hole _X3 . That is, the entire first clamp 10 and toggle mechanism 52 are moved rearward.

Next, the second clamp 11 is advanced appropriately using the torque wrench 57, and the ratchet pawl 63 is lowered to engage the ratchet 64, thereby locking the second clamp 11 so that it cannot be moved back. Then, the torque wrench 10 for the first clamp is pushed down, the pipe P is inserted into the socket S, and both P and S are connected.

Note that when fixing the socket S to the second clamp 11, the elbow pipe support plates 45 and 46 are placed in an upright state, and the rear end of the socket S is fixed to the plate 4.
You may press it with 5, 46. Of course, when fixing the elbow tube to the second clamp 11, both the plates 45 and 46 are placed in an upright position as described above, and the bent portion of the rear end of the elbow tube at right angles to the plane of the paper in FIG. It is pressed forward and held by plates 45 and 46.

When connecting the end faces of pipes using the butt joint method, replace the first and second heater attachments 81 and 82 shown in FIG. 1 with heater attachments 87 as shown in FIG. Tilt the support plates 45 and 46 forward. Furthermore, the first clamp toggle mechanism 52
The pin 71 is supported, for example, in the second support hole _X2 portion, and the first clamp 10 is brought close to the heater holder 12 side. The subsequent work is almost the same as the pipe and socket connection work described above.

FIG. 6 shows a modification of the heater attachment, and this heater attachment 91 is, for example, integrally equipped with a large-diameter cylindrical portion 91a at the front (arrow F side) and a small-diameter cylindrical portion 91b at the rear. , a flange 92 is provided at the intermediate portion, and the heater holder 12'
The flange 92 is inserted into a hole 94 formed in the hole 94, and the flange 92 portion is locked and held by a plurality of protrusions 77'. Of course, a notch 94 is formed in the flange 92 to correspond to the projection 77'. That is, the pipe P and the socket S can be heated and melted by one heater attachment 91.

As explained above, in the present invention, a pair of clamp mechanisms for holding pipes such as pipes and sockets, for example, first and second clamps 10 and 11, are attached to the guide rail 8 having a certain length, so that the guide rail 8 has a fixed length. The heater holder 12 is disposed between both clamps 10 and 11, and the heater holder 12 can be freely retracted from between both clamps 10 and 11, and each clamp 10 and 11 has a manual for movement operation. The type toggle mechanisms 52 and 53 are connected, and at least one clamp mechanism, for example, the first clamp 1
The toggle mechanism 52 of 0 is provided with a stroke change mechanism (pin support holes X ₁ , X ₂ ,
X ₃ , etc.), it has the following advantages:

(1) The movement start position of the clamp mechanism 10 by the toggle mechanism 52 can be adjusted to the most appropriate position according to each connection method such as the socket method or the butt joint method. There is no need to operate the torque wrench 68 with an unnecessarily long stroke, and the moving operation becomes easier. That is, by using one connecting device, whether connecting by a butt joint method or by a socket method, a reliable connection can be achieved by easy operation of a torque wrench.

(2) During the connection work process using any of the above methods, the first clamp 10
The movement start position can be changed to the second clamp 11 side from the movement start position during heating and melting. In other words, in both the heating and melting process and the subsequent joining process of pipes, it is possible to select the starting position of the clamp mechanism that is most suitable for each process. Can be done reliably with easy torque wrench operation.

In addition, in the present invention, both toggle mechanisms 52 and 53 may be provided with a stroke changing mechanism.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of the plastic pipe connecting device according to the present invention, Fig. 2 is a cross-sectional view taken in the direction of the arrow in Fig. 1, Fig. 4 is a cross-sectional view taken in the direction of the arrow in Fig. 1. 5 and 6 are side views showing modified examples of the heater attachment, respectively. 8... Guide rail, 10, 11... Clamp (an example of a clamp mechanism), 12... Heater holder, 52, 53... Toggle mechanism, 71, X ₁ ,
X ₂ , X ₃ ... Pin, pin support hole (stroke change mechanism).

Claims (1)

[Scope of utility model registration request] A pair of clamp mechanisms for holding pipes such as pipes and sockets are fitted onto a guide rail having a certain length so as to be movable in the rail length direction, and a heater holder is disposed between both clamp mechanisms.
The heater holder can be freely retracted from between both clamp mechanisms, a manual toggle mechanism for movement operation is connected to each clamp mechanism, and the toggle mechanism of at least one clamp mechanism is used to move the heater holder and the other clamp mechanism. A plastic pipe connecting device characterized by being equipped with a stroke changing mechanism that can change the starting position.