JPS5865624A - Plastic material manufacturing device for forming hole to element made of plastic of lower section and manufacture of said device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention describes a method for making a device of this type for making holes in a lower element made of a similar or equivalent plastic material; and the use of the device for making branch pipe connections.

Although the device according to the invention can be used to create holes in any element below, its primary use is in the field.
It consists in installing a branch pipe connection in a main pipe made from a pipe made of plastic material (in percent thermoplastic material).

Generally, this type of branch pipe connection is made by drilling a hole in the main pipe. That is, after the connecting portion is installed at a predetermined position, the hole is created by heating the portion of the main pipe made of thermoplastic material to be drilled with a heating electric resistor.

In the known conventional device, the heating electrical resistor is arranged in the saddle of the branch pipe connection installed in the main pipe section at the location to be connected and heats the saddle and the zone of the main pipe to be drilled. In this case, the branch pipe connection and the main pipe must be welded and sealed at the same time by this heating.

Known devices for providing this type of heating consist of a pre-coated heating wire with an insulating sheath, wrapped around it and then embedded in a generally circular section of the saddle for attachment to the outside surface of the main conduit. do.

However, the production of this type of helical body and its embedding in the saddle are difficult and expensive operations, and if high quality is desired, mass production is not possible.

Furthermore, one end of the body for connecting to the heating power source is
Being inside the smallest turn, this end must be connected to the power source via the interior of the tubular branch pipe connection, thus complicating the drilling operation.

Another known proposal uses a rectangular net of wire covering the sheath, which is enclosed at the junction of the branch pipe connection and the main pipe and fixed inside the branch pipe connection. The branch pipe connecting portion is pressed against the main pipe using a crank to obtain the crimp force necessary for installation, and electricity is applied to heat the wire. When the wall of the main conduit reaches sufficient viscosity, the main conduit is perforated.

In this method, the main outer circumference of the main conduit is heated, so a large voltage is required for welding, and the plastic material that makes up the main conduit needs to be softened, so there is a risk of the main conduit splitting. In addition, during the drilling of the main pipe,
The necessity to cut several wires of the rectangular net complicates the operation and may possibly cause the sheath to heal on the surface of the separated heating wires, resulting in micro-leakage.

In order to eliminate the above-mentioned disadvantages, the object of the present invention is to consist of a plate having a relatively thin thickness, having an opening in the center and having a spiral groove on one side, the spiral groove having the above-mentioned groove. 41 to receive a heating wire having one end locked to a first protrusion installed on the surface of the plate provided with the groove and the other end locked to a similar second protrusion located at a distance from the first protrusion. The purpose is to create a device of the type described by Chizu.

A first embodiment of a device of this kind provides that the plate is substantially circular and has two ears carrying projections, the outer turns of the helical grooves of the plate at the location of said first projections. The plate is open at the groove and is provided with tongues for carrying the second protrusion, said tongues having at least a portion in a radial position to wrap around the inside of the groove. It is characterized in that it can be folded onto the surface of the plate provided with grooves to serve as an insulating support for the wire trail to emerge and lock onto the second protrusion.

In another embodiment, the plate K is provided with a guide claw for the wire that is engaged with the first protrusion at the position of the outer circumferential opening of the slot, and/or a wire guide claw that is engaged with the first protrusion is provided on the upper surface of the bent tongue. It is characterized by the provision of claws to guide the wires that are engaged with the two protrusions.

A further embodiment is characterized in that the tongs are provided with a thin section near the periphery of the plate forming a folded section, b)
At the periphery of the plate, between the two protrusions there is at least one
C) each projection has a conical base connected to the groove mounting surface of the plate, terminating in a cylindrical portion, and d) the sides of the helical oscil are located at the center of the plate. and ') the width of the groove is smaller than the diameter of the heating wire over at least a certain length of the groove.

“The present invention further relates to a method for installing a heating wire in one helical groove.This method involves locking the heating wire pulled out from the bobbin to the first protrusion, wrapping it around the adjacent or claw,
Place a cross member with multiple legs extending between two protrusions in the center of the plate, rotate the plate below the cross member to fully load the heating wire, fold it onto the tong plate, and place the wire The cut wire is cut, and the end of the cut wire is passed between the claws carried by the tongs and is locked to the second protrusion.

After carrying out the above operations, it is advantageous to press a hot tool to deform the mouth of the groove and attach the inner pressure heating wire to the groove.

The invention further relates to the use of the above device for fixing the saddle of a branch pipe connection to a main pipe made of plastics material. In this method, the above-mentioned curved device is placed on the surface of the saddle to be attached to the main conduit, preferably when the saddle is formed, and during the heating of the wire, the device is tilted by a U-shaped hook hooked to the leg of the saddle. The saddle is firmly held in the conduit by engagement with a half ring including a locking groove, or by a tightening action due to elastic deformation of the half ring and/or the saddle.

The invention will now be described with reference to the accompanying drawings, which show examples of embodiments.

As can be seen from FIGS. 1 and 2, the device according to the invention also comprises a castable, substantially circular, thin plate 1 of plastic material. In the upper surface 2 of this plate 1, a groove generally indicated by 3 is directly created when the plate 1 is cast. The outer winding 4 of the groove is preferably
Since the wide groove WII provided with the claw 5' is open to the peripheral surface of the plate, the mold can be easily removed by simply rotating the plate within its own plane. At the location of the wide groove 5, the plate 1 is extended to form a first ear 6. Molded into this ear is a first projection having a substantially trapezoidal bottom 8 and a cylindrical top 9. A second lug 6' diametrically opposite to the lug 6 is provided with a second protrusion 10 identical to the first protrusion 7. A curved tongue 12 is connected to the second projection via a thin portion forming a bent portion. This portion 13 of the tongue assumes a position substantially in line with the projections 7, 10 and the inner winding end 14 of the groove 3 when the tongue is folded.

On the back of this tong part, there are two rows of claws 15°15'.
(Fig. 5) is the provision. Furthermore, on the periphery of one plate 1, there are four positioning protrusions 16.17°18.19 (these are K
(described below) is a provision. The depth of the groove 3 is chosen such that the heating wire is located as close as possible to the side opposite to the side on which the groove is provided.

When installing the 'H heating wire in groove 8, operate as follows. The heating wire 19 (Fig. 3) is stored in the pot 720.
The free end of the wire is passed around the protrusion 5 and placed at the entrance of the helical groove 3.

Next, a cross member 21 having four legs is placed on the center of the plate 1 so as to press the plate, and the flat rod is rotated clockwise to gradually load the wire pulled out from the bobbin 2o into the groove.

Once the wire is loaded up to the end 14 of the winding inside the groove 3, remove the cross member 21, being careful not to allow the wire to protrude from the groove, and position it so that the portion 13 is in line with the protrusions 7 and 10. Fold the curved tongs 12, 18 onto the plate 1 around the thin part 11 so that
figure). Next, wire 1 is inserted between the two rows of claws 15 and 15'.
9 and wrap the wire end around the protrusion 10 (FIG. 4).

In order to prevent the wire from deviating from the 2-zoo, after removing the cross member 21, a plurality of trapezoidal conical parts 22, 22'
, 22', . . . , 22n,
The edge of the groove can be crushed by pressing onto the surface of the plate 10 provided with the groove containing the heating wire. however,
As shown in FIG. 6, the inner wall of the groove can also be sloped downwardly and toward the center of the plate. In this way, wires placed under tension within the groove are prevented from escaping.

Furthermore, the width of the upper edge of the groove is made smaller than the wire diameter,
It is also possible to trap and seal the wire in the groove.

FIG. 7 shows the use of the apparatus according to the invention for making branch pipe connections in the main pipe 28 in the field. In this case, the branch part is composed of a saddle part having a curvature equal to the outer diameter of the main pipe, and a tubular chimney which connects the branch pipe 26 mounted on the saddle part to the side surface, and is fixed onto the main pipe 23. It is something that should be done.

The internal threads 27 of the chimney can be screwed with a perforator 28 provided with a lower tip 29 for perforating the wall of the pre-molten conduit through the internal bore 30 of the chimney. After the penetration and after the wall of the conduit has solidified, the perforator 28 with the sealing gasket 31 is pulled up above the branch pipe 26 and removed.

To heat and melt the plastic material constituting the conduit 23 at the location where a branch pipe connection is required, the apparatus according to the invention described with reference to FIGS. 1-6 is used. A plate 1 loaded with a heating wire is installed on the lower surface of the saddle 24,
The saddle is crimped onto the conduit by a tightening ring that engages the saddle at the positions of the two legs 32,33. Terminals 1, 10 of plate 1 are then connected to a power source to melt or soften the corresponding portions of conduit 23. After the portion of the conduit 23 corresponding to the plate 1 has solidified, the perforator 28 is inserted into the chimney and the lower end 29 penetrates the wall of the conduit.
is displaced from the branch pipe 26. Thus, a hole is formed,
Sealing is achieved by the fusion K of the plate 1 and the wall of the conduit at least at the surface. O-ring 31'
Once in place, the cap 28' is screwed back onto the chimney portion of the branch pipe connection.

However, when forming the branch pipe connection saddle, it is advantageous if, as shown in FIG. 9, a heating plate 1 of the type described in FIGS. 1-6 is incorporated in the saddle.

The plate 1 is placed on the protrusion 39 of the mold that matches the shape of the saddle to be produced, and the slides 35, 36 are placed in the retracted position when the mold is opened. Next, the chimney 2 is equipped with an injection runner 39.
The upper die 87 having the protrusion 38 forming the cavity No. 6 is lowered to fix the center of the plate 1. Slides 35, 36 are then closed and moved to position 3, which mates with plate 1'.
5′.

Place it at 36'. A thermoplastic material is injected into the thus closed mold to create a branch pipe connection part in which the plate 1' is embedded. At the same time, form a small maintenance chimney 40, 40' surrounding the terminals 7° and 10 of one plate 1, and hold the wire to be passed between the claws 15 and 15' on the part 13 of the tongue that is bent onto the plate. 11 and 12 show another embodiment of the method for making a branch pipe connection using the plate according to the present invention.

In the figure, the same elements are indicated by the same symbols.

A half-ring 42 made of plastic material is used to tighten the saddle 1 embedded with the plate 1 according to the invention equipped with bare heating wires whose terminals 7, 10 are secured in the chimneys 40, 41. These U-shaped grooves 4s and 44 are provided. The legs sz, ss of the saddle engage in the grooves, and thus the saddle is tightened to the conduit 2sK, and the plate 1 is crimped and well welded to the outer wall of the conduit.

In another embodiment, the U-shaped grooves are of the same height and instead the legs sz, sa are aligned relative to the axis of the conduit.
There is. In this case, the same result can be obtained with the opposite configuration. In yet another embodiment, for a given diameter of the conduit, the legs 82. Tightening is performed by selecting a radius of curvature of /g. An example of this is shown in the embodiment of FIG. In this case, the half-ring 42 is connected to the unbranched saddle 24'.

Of course, the present invention is not limited to the embodiments described above, and various design variations are possible.

[Brief explanation of the drawing]

1wA is a longitudinal cross-sectional view of the device according to the present invention, and FIG. 2 shows a surface including a helical groove. FIG. 1 is a plan view of the device, FIG. 3 is a plan view showing how the heating wire is installed in the spiral groove, FIG. 4 is a detailed view showing the connection terminal of the device according to the present invention, and FIG. 6 is a plan view of the device according to the invention with a deformable tool installed at the mouth of the helical groove for sealing the wire, and FIG. 6 shows the special shape of the radial cross section of the groove. . FIG. 7 is a partial vertical cross-sectional view of the device according to the present invention, and FIG. 7 is a sectional view taken along line 1--■, Figure 9 is a schematic diagram of an injection molded product for assembling the device according to the present invention into a saddle, and Figure 10 is a detailed view showing the exit of the heating wire. ttm4 construction, an exploded perspective view of the saddle and the tightening half ring, Fig. 12 is a cross-sectional view of Fig. 11 with both parts assembled, and Fig. 13 is a schematic cross-section of the tightening ring. Al. 1...Plate, 1'...Opening, 2
... One-yv-to drawing with a groove, 3... Spiral groove, 4... Winding key, 7.10... Protrusion, 19...
Heating wire. Agent Masao Miyake and 1 other person - 1 (Flc, 4 ric, 6 Procedural amendments (voluntary) August 27, 1980 Commissioner of the Patent Office Kazuo Chikusugi 1, Indication of the case 1982 Patent Application No. 112634 Relationship with Patent Applicant Address Name (Name) Innovation Technic Name (5
930) Patent attorney Masao Miyake (and 1 other person) 5. Date of amendment order Voluntary 6. Number of inventions increased by amendment 08. Contents of amendment'' (1) Fill out the field for the representative of the patent applicant in the application. Supplement as shown in the attached sheet. (21 Amend the specification into a typewritten version as shown in the attached sheet. (Amendment Jl: No content) (Supplement 31 Power of attorney and its translation as shown in the attached sheet. (4) The priority IE statement and its translation are supplemented as attached. (91

Claims (10)

[Claims] (1) Plastic material (
Particularly, in a device made of a thermoplastic material, the plate 1 is relatively thin and has an opening 1' in the center and a spiral groove 3 on one side 2. , a heating wire 19 has one end locked to a first protrusion 7 installed on the surface of the plate provided with the groove, and the other end of a similar second protrusion 101C located away from the first protrusion. A device that makes it easier to accept. (2) The plate 1 is substantially circular, and the protrusion 1
The outer turn of the helical groove opens into the peripheral surface of the plate at the level of said first projection, and the plate has two ears 6.6' carrying a second projection. A carrying ear level ζ tongue 13 is provided, said tongue having at least a part in a radial position,
Claim 1 characterized in that it can be folded onto the groove mounting surface of the plate to serve for insulating support of the wire trail emerging from the inner turn 14 of the groove and anchoring to the second protrusion 10.
Apparatus described in section. (3) The plate is provided with a wire guide claw 5' that engages with the first protrusion at the position of the center part of the curved surface;
And/or, on the upper surface of the bent tongue 13, there is a guide claw 1 for the wire that is engaged with the second center spring 10! Claim 1!11111 characterized in that $, 15' are provided.
2. The device according to item 2 or item 2. (4) The device according to claim 2 or 3, wherein the tongue 1s is provided with a thin portion 11 forming a folded portion near the peripheral edge of the plate. (5) The device according to one of claims 1 to 4, characterized in that the peripheral edge of the plate is provided with at least one positioning projection 16 between two projections. (6) one of claims 1 to 5, characterized in that each projection 1.10 has a conical base connected to the face of the grooved plate and terminates in a cylindrical part; The device described in. (7) A device according to one of claims 1 to 6, characterized in that the side surfaces of the helical grooves are inclined in the direction of the center of the plate 1'. 8. Device according to claim 1, characterized in that the entrance of the groove is smaller than the diameter of the heating wire over at least a certain length of the groove. (9) A method for installing a heating wire in the spiral groove of the device according to any one of claims 1 to 8,
The heating wire 19 pulled out from the storage bobbin 720 is locked to the first protrusion 7 and wrapped around the adjacent claw 5', and the cross member 21 having a plurality of legs extending between the two protrusions is positioned at the center of the plate. Place the plate 1tl below the cross member 21
' Bend the tongs 1s over the tongs 1, cut the wire coming out of the bobbin, and attach the claws 15, which are the ends of the cut wires, carried by the tongs. The method is characterized in that the second protrusion 10 is engaged with the second protrusion 10 by passing it between the two protrusions Is'. (10) After performing each operation, the hot tool 22°224
The method (11) according to claim 9, characterized in that the opening of the groove 3 is deformed by crimping. The device according to one of claims 1 to 8, which is made of a thermoplastic material, is installed in a saddle part 2 of a branch pipe connection part to a main pipe made of a thermoplastic material.
4, the curved device 1 is embedded in the face of the saddle which is attached to the main conduit 23, preferably during the shaping of the saddle, and is latched to the leg of the saddle during heating of the wire. The saddle is attached to the conduit by means of a U-shaped hook, or by engagement with a half ring containing inclined locking grooves 43, 44, or by a tightening action due to elastic deformation of the cow ring and/or the saddle. Usage characterized by firm holding.