FI129923B - Method and apparatus for manufacturing a strain relief member integrated with a pipe and intended to relieve through a hose - Google Patents

Abstract

The invention relates to a method and apparatus for manufacturing a water diversion device which is integrated with a pipe and intended to divert via hose, in which method a water diversion device (14) is formed in a tubular template (10) using a press tool (6), whereby the press tool (6) comprises a production tool equipped with a mold holder 82) and at least one locking part (8a, 8b).

Description

METHOD AND APPARATUS FOR PIPE-INTEGRATED, HOSE DRAW-

FOR MANUFACTURE OF DRAFT RELIEF BODY INTENDED FOR EXTRACTION

The object of the invention is the method defined in the preamble of claim 1 and the apparatus defined in the preamble of claim 10 for the manufacture of a strain relief element integrated in a pipe and intended for strain relief in a hose.

The fuel suction pipe is used, for example, to supply fuel to a retrofitted fuel-powered auxiliary heater of cars or boats, later vehicles. A fuel-powered additional heater needs fuel to produce thermal energy. The heater gets the operating current needed for heating directly from the vehicle's battery.

With the heating energy of the heater, the vehicle's engine and/or interiors are heated. Air heaters transfer thermal energy to the interior of the vehicle by heating the air directly, while Water heaters transfer thermal energy to both the engine and the interior via the cooling system containing the vehicle's coolant.

The fuel suction pipe of known fuel-powered auxiliary heaters is installed directly in the vehicle's fuel

O 25 to the tank. From the suction pipe, the fuel supply line continues through the suction hose to the fuel = liquid pump of the fuel-operated additional heater. The suction hose must be attached to the suction pipe in a gas- and liquid-tight manner so that the fuel supply line can * function leak-free. The connection between the suction pipe and the suction hose

The S 30 toke must also be mechanically durable, because otherwise = the detachment of the fuel hose would cause the use of fuel

N working auxiliary heater fuel supply line desperation

I feel the disconnection. The joint is therefore characterized by the ability to reduce mechanical forces and other stresses applied to it. The problems mentioned above can be eliminated with the help of connector elements intended for strain relief, i.e. connector nipples.

The connection nipple, which is generally intended for hose strain relief, prevents unwanted movement of an extension part, such as a rubber hose, connected to a rigid pipe in the system in the direction of the pipe. With the air- and liquid-tight connection of the extension part, it is possible to guarantee good flow properties for the fluids traveling in the hose. The characteristic of the connector intended for strain relief is that it is slightly larger in diameter than the extension part to be connected and does not contain sharp corners that could break the extension part to be connected. In addition, the connection nipple is characterized by constant or gradual stress, the effect of which increases the longer the extension part of the equipment, later the hose, is extended.

The method and apparatus according to the invention, hereafter briefly the solution according to the invention, for the manufacture of a strain relief nipple integrated in the suction pipe, intended for strain relief in the hose, is excellently suitable for use in pre-

O 25 is the symbol for strain relief between the suction pipe and the suction hose connected to the fuel tank of the auxiliary heater retrofitted to fuel liquid-powered vehicles. The z solution according to the invention is also very suitable for use in other + connections for connecting a flexible hose to a rigid pipe

S 30 or nipple. ©

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In accordance with previously known technology, connection nipples intended for hose strain relief, later strain relief nipples, are mostly manufactured as separate parts that are connected to the system by, for example, twisting or welding. Solutions based on twisting also require screw threads for the pipe to be attached, which are mostly challenging to manufacture, especially for pipes with a small diameter. When welding, on the other hand, the congruence of the weldability properties of the joining materials must be taken into account.

In addition, there is a possible risk of the joint leaking or the connector coming off during use with separately attached parts. When welding, you must also take into account the time it takes for the joint to cool down and check for possible welding defects in the joint, which significantly weaken the mechanical properties of the structure.

Previously known technology also knows a method in which one or more threads are formed at the end of the pipe by shaping the inner diameter of the pipe outwards with the help of hand-operated pliers, which creates a strain relief nipple-like shape. This kind of technology is characterized by an uneven surface quality, which usually includes sharp corners or unevenness of the thread structure, which usually leads to a hose joint due to high stress

O 25 for cheating or leakage problems. 3 = The prior art also knows a method in which the draft removal nipple intended for draft removal is implemented by soldering

A separate metal layer at the end of the pipe. The problem with the soldered ra- = 30 field is most often the uneven end result of the connection between the suction pipe and the = hose, which makes it difficult

connecting the N hose to the pipe, as well as weak mechanical

its durability. In addition, undesirable burrs, sharp corners or other surface quality defects are easily formed at the joint, which may lead to premature breakage of the joint or the hose installed in it. The biggest risk of the method is the sudden detachment of the soldered structure, due to the connection between two different materials. In addition, the production of strain relief nipples made with this method is quite slow, and the method is therefore not suitable for use in series production.

The purpose of this invention is to eliminate the above-mentioned drawbacks and to provide an inexpensive, simple and reliable method and apparatus for manufacturing a strain relief element integrated in a pipe, intended for strain relief in a hose. The method according to the invention is characterized by what is presented in the characteristic part of claim 1. Correspondingly, the equipment according to the invention is characterized by what is presented in the distinguishing part of patent claim 10. Other application forms of the invention are characterized by what is presented in other patent claims. _ With the method according to the invention, a thin, for example

On the end of the pipe made of O 25 stainless steel, an expansion integrated into the pipe is molded, such as an annular nipple = shape, which is suitable for strain relief between the pipe and the hose z to be installed in it. Molding takes place with the help of + equipment according to the invention, which comprises a manufacturing tool which

The S 30 can be connected, for example, to pressing or = threading tools already on the market, which allow machining

N required compression force. Manufacturing work according to the invention

the tool comprises a design nest for the strain relief nipple, which is used to create a strain relief structure suitable for the strain relief of the fuel hose connected to the fuel suction pipe, a screw-threaded 5 fastening part suitable for attaching the manufacturing tool, a nut-like clamping part, a loose counter piece and, if necessary, adjustment parts.

One of the advantages of the solution according to the invention is that the structure of the strain relief nipple obtained by the method can be integrated into the end of the pipe. The structure integrated at the end of the pipe is a much more mechanically durable solution compared to a structure formed by welding or soldering. The fixed structure of the solution according to the invention is also a more durable and reliable solution than a strain relief nipple made of separate parts that are connected by twisting, because it is very challenging to produce a high-quality screw-thread structure that can guarantee the reliable holding of the joint, especially for pipes with a small diameter.

The advantage of the solution according to the invention is also that the strain relief nipple produced by the method has a good and even surface quality, which enables the production of parts with the same surface quality. In the method, the surface does not form

O 25 there is no unwanted burr and no sharp corners, which required separate surface quality post-treatments, such as sanding or filing. The method therefore achieves good surface quality more easily and more reliably than if + the strain relief nipple were made by soldering or welding- = 30. c/o

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It is also an advantage that the manufacture of a strain relief nipple made for the end of a pipe is significantly faster than the manufacture of strain relief ends made by welding or soldering, for example. In addition, the manufacturing tool is suitable for use in series production by placing several manufacturing tools one after the other in the pressing tool used either vertically, horizontally or in a combination of these.

One of the advantages of the solution according to the invention is that the distance of the strain relief nipple from the end of the pipe can be easily scaled using the separate adjustment parts of the manufacturing tool.

In addition, one of the advantages of the solution according to the invention is that the manufacturing tool is simple in structure and components already on the market can be used in its manufacture, making the production costs of the tool as affordable as possible. Therefore, repairing the manufacturing tool is also simple and fast. In addition to this, the manufacturing tool can be connected to various already existing pressing or screwing tools, with the help of a standard-sized screw-threaded support structure suitable for its attachment, with which the pressing force necessary for forming the pipe is achieved. In addition to these, my draft remover-

No separate lubricants are needed to make the O 25 pan. 3 = In the following, the invention is explained in more detail with the help of one application example by referring to the attached single->folded drawings, where s 30

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= figure 1 shows a part of the equipment according to the invention

N viewed from above,

figure 2 shows a part of the equipment according to the invention and a tubular blank as viewed from above, figure 3 shows a part of the equipment according to the invention and a tubular blank as viewed from above, figure 4 shows a front view of the locking parts according to the invention and a tubular blank, figure 5 shows a front view of the locking parts according to the invention and a tubular blank, when the blank is locked between the locking parts, Figure 6 shows a cross-section of the manufacturing tool according to the invention, Figure 7 shows a cross-section of the manufacturing tool according to the invention, when a support member is fitted to the manufacturing tool, Figure 8 shows a top view of the preparation phase of the method according to the invention ,

O 25 figure 9 shows, viewed from above, the implementation phase of the method according to the invention and z figure 10 shows the strain relief element produced by the method and equipment according to the invention in the pipe oO

N 30 in the end.

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The purpose of the method and equipment according to the invention is to form a strain relief element, i.e. a strain relief nipple, for the hose to be connected to the pipe in the pipe blank, preferably the fuel intake pipe blank.

Figure 1 shows part of the equipment according to the invention, viewed from above. The equipment includes a manufacturing tool 1, with the help of which a strain relief element, i.e. a strain relief nipple, is produced for an essentially tubular blank. The manufacturing tool 1 comprises a shaping nest 2, of which only the outer wall is visible in Figure 1, a clamping part 3 and a fastening part 4, all of which are preferably one and the same piece.

In this embodiment of the invention, the outer diameter of the molding housing 2 is smaller than the diameter of the clamping part 3, and a loose counterpart piece 5 is fitted around the molding housing 2 to make the structure more stable. In Figure 1, the counter part 5 is shown in cross-section. Just as well, the outer diameter of the shaping socket 2 could be larger and a separate counterpart 5 is not necessarily needed.

The manufacturing tool 1 is fixed by twisting it with the help of the external screw thread of the fastening part 4 to a pressing tool 6 suitable for the purpose, which is, for example, a mechanical, electric, pneumatic, hydraulic or manual tool available on the market.

O 25 single-use pressing or screwing tool 6. In Fig. 1, only part of the fastening point of the manufacturing tool 1 can be seen from the pressing tool 6, partially cut. Manufacturing tool 1 tightening

I is firmly attached to the pressing tool 6 by turning the clamping + part 3, for example with a spanner. 3 30

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= The first locking part 8a is preferably attached to the same

N to the body part like the pressing tool 6, which is still attached to

riveted one or more manufacturing tools 1. The body part of the equipment is not shown in the figures. The locking part 8a is attached to the front side of the manufacturing tool 1, i.e. the side of the free end at a distance from the manufacturing tool 1. The locking part 8a has a groove 9 for the tubular blank to be processed.

One or more loose adjustment parts 7, such as a washer, can be fitted around the fastening part 4, between the manufacturing tool 1 and the pressing tool 6. With the help of the adjustment parts 7, the distance between the manufacturing tool 1 and the locking part 8a can be adjusted.

The counter piece 5 of the manufacturing tool 1 is placed around the shaping nest 2 so that it rests on the front surface of the clamping part 3. The task of the counter piece 5 is to protect the structure of the forming nest 2 and to distribute the pressing force of the pressing tool 6 evenly to the manufacturing tool 1.

Figure 2 shows a part of the equipment according to the invention as viewed from above and the tubular blank 10 to be processed. The blank 10 is fitted into the groove 9 of the first locking part 8a and the first end of the blank 10 is pushed into the forming socket 2 of the manufacturing tool 1. The blank 10 is, for example, a steel pipe with an outer diameter of for example 4 mm and an inner diameter _ for example 2 mm.

O 25 ro Figure 3 shows a part of the device according to the invention as viewed from above and the tubular blank 10 in a situation where the blank + 10 placed in place according to Figure 2 is locked in place by fitting the first locking

S 30 on top of part 8a an essentially similar second locking part = 8b and by pressing the second locking part 8b the first lock-

N against the part 8a to prevent the blank 10 from moving. May-

Nitto pressing can be done, for example, with a mechanical screw press, a hydraulically or pneumatically functioning pressing element or some other pressing element suitable for the purpose.

Figure 4 shows a front view of both locking parts 8a and 8b and a tubular blank 10. The blank 10 is fitted into the groove 9 of the first locking part 8a. In the situation of the figure, the second locking part 8b is being fitted on top of the first locking part 8a.

Figure 5 shows a front view of both locking parts and a tubular blank. The second locking part 8b is fitted on top of the first locking part 8a so that the blank 10 is between the locking parts 8a and 8b in the grooves 9 of the locking parts 8a and 8b. After this, the second locking part 8b is pressed against the first locking part 8a, so that the blank 10 cannot move between the locking parts regarding. Preferably, the locking parts 8a and 8b are metal pieces in the shape of an essentially rectangular frame, with a semicircular groove 9 on one wide side. When the locking parts 8a and 8b are superimposed, the grooves 9 form an essentially round hole-like space in cross-section, the longitudinal central axis of which is the locking parts 8a, 8b at the encounter level and

O 25 preferably essentially co-axial with the longitudinal central axis of the manufacturing tool 1 ro. = Advantageously, the groove 9 is made slightly smaller in diameter, for example + two tenths of a millimeter smaller than before

S 30 grind 10 outer diameter. This ensures effective locking of the blank 10 between the locking parts 8a and 8b.

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Figure 6 shows the manufacturing tool 1 according to the invention in cross-section. The function of the forming socket 2 of the manufacturing tool 1 is to give the shape of the outer surface of the strain relief nipple to be formed. The inside of the shaping nest 2 consists of a shaping section 2A and a support section 2B. The molding section 2A of the molding nest is conical in shape, the longitudinal space of the manufacturing tool 1, the first end of which is flush with the first end of the molding nest 2 and the other end is at a distance from the first end of the molding nest 2, inside the manufacturing tool 1. The diameter of the first end of the shaping section 2A is larger than the diameter of the second end of the shaping section 2A. The diameter of the first end of the shaping section 2A is preferably, for example, 1-2 millimeters larger than the outer diameter of the blank 10. The diameter of the other end of the shaping section 2A is essentially the same as the outer diameter of the blank 10.

The support section 2B of the forming nest 2 is a space, for example, 1-3 millimeters long in the longitudinal direction of the manufacturing tool 1, and its diameter is essentially the same as the outer diameter of the blank 10. The support section 2B of the forming nest starts at the level of one end of the forming section 2A of the forming nest and continues towards the other end of the manufacturing tool 1. Advantageously, the support section 2B of the shaping nest ends, for example, at the level of the other end of the shaping nest 2. As a whole, the shaping nest is 2 in length

O 25, for example, about 6-8 millimeters. 3 = The manufacturing tool 1 also comprises a drilling 11 substantially corresponding to the inner diameter z of the blank 10, which starts at the same end of the other end of the shaping * nest 2 and continues through the manufacturing tool 1

S 30 on the central axis through the entire manufacturing tool 1. Advantageously = drilling 11, support section 2B and shaping section 2A form a val-

The longitudinally uniform, cross-section of the N cutting tool 1

a hole-like space with different diameters, whose central axis coincides with the longitudinal central axis of the manufacturing tool 1.

Figure 7 shows the manufacturing tool 1 according to the invention in cross-section in a situation where a pin-like support member 12 is fitted to the bore 11 of the manufacturing tool 1, which support member 12 is arranged to prevent the blank 10 from being compressed inward when the strain relief nipple is formed. The support tongue 12 is, for example, a metal pin or spike, the outer diameter of which is essentially the same as the inner diameter of the blank 10. Preferably, the support member 12 extends to the level of the first end of the manufacturing tool 1 or even to the front of the first end. In Figure 7, the support member 12 is shown to extend to the front of the first end of the manufacturing tool 1.

Figure 8 shows the preparation phase of the method according to the invention, viewed from above. In Figure 8, the manufacturing tool 1 is shown in cross-section. The workpiece 10 to be processed is fitted to the manufacturing tool 1 in such a way that the end part of the workpiece 10 rests on the other end of the support section 2B of the forming nest. In addition, the blank 10 is locked between the locking parts 8a and 8b. Figure 8 does not show the second locking part 8b for the sake of clarity. _ Figure 8 shows that the blank 10 and the shaping nest 2

O 25 around the toil section 2A remains an evenly distributed free space, the diameter of which increases towards the inner end of the manufacturing tool 1, and into which free space the blank 10 can expand. There is a horizontal distance of 13 between the manufacturing tool 1 and the locking parts 8a and 8b *. 3 30

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= Figure 9 shows a top view of the one according to the invention

The operating principle of the N method. In Figure 9, the manufacturing tool 1 is shown in cross-section. The workpiece 10 to be processed is fitted to the manufacturing tool 1 in such a way that the end part of the workpiece 10 rests on the other end of the support section 2B of the forming nest. The blank 10 is locked between the locking parts 8a and 8b so that the blank 10 is held in place during the pressing phase.

Figure 9 does not show the second locking part 8b for the sake of clarity. The blank 10 is pressed by moving the manufacturing tool 1 with a pressing force towards the locking parts 8a and 8b, i.e. in the direction of the arrow A shown in Figure 9. The compression force is produced, for example, electrically, with compressed air, hydraulically or with a manually operated compression or screw tool.

Preferably, the first end of the manufacturing tool 1 is pressed onto the locking parts 8a and 8b or at least substantially close to the locking parts 8a and 8b. Due to the compressive force caused by the pressing tool 6, the desired outwardly expanded shape of the strain relief member 14 is formed at the end of the blank 10, inside the shaping section 2A, which is, for example, about 1-2 millimeters larger than the blank 10 in its largest diameter.

When forming the strain relief member 14, a support member 12 can be fitted inside the manufacturing tool 1, as shown in Fig. 7. However, the support member 12 is not necessarily needed, but the formation of the strain relief member 14 can be done without it

O 25 —most supportive too. However, the use of the support member 12 ensures that the blank 10 is not compressed inwards. = Figure 10 shows a strain relief element made by the method according to the invention * and the manufacturing tool put-

S 30 at the 10 end of the bumblebee blank. Figure 10 shows the outward expansion of the strain relief member 14 formed at the end of the blank 10

N nut shape achieved by cold forming.

It is clear to a person skilled in the art that the different application forms of the invention are not limited to the examples presented above, but may vary within the framework of the patent claims presented below. It is essential that, in the solution according to the invention, the outwardly expanded shape of the nipple suitable for strain relief is formed integrated into the end of the pipe by the combined effect of the inner shape of the forming socket and the compression force of the used compression tool. So, for example, the materials, shapes, dimensions, size and relationships of the main components can be different from what has been presented above.

It is also clear to a person skilled in the field that strain relief nipples can also be made with the method and manufacturing tool according to the invention for other types of pipes and/or pipe blanks than fuel suction pipes.

It is also clear to a person skilled in the art that the tubular blank to be processed can be held in place during compression with the help of only one locking part suitable for the purpose.

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Claims (14)

PATENT CLAIMS 1. A method of making a strain relief integrated with a pipe and intended for strain relief of a hose, in which method a strain relief (14) is formed in a tubular blank (10), and the strain relief (14) is formed by pressing the blank (10) in the longitudinal direction of the blank (10) to expand the outer diameter of the blank (10) in a space formed by a mold housing (2), characterized in that the first end of the blank (10) before the production of the strain relief ( 14) is fitted into a production tool (1), in the mold housing (2), and is supported against the other end of the mold housing (2), against an essentially cylindrical support part (2B) whose diameter is essentially the same as the outside of the unexpanded blank (10) - diameter, and that the strain relief (14) is created in the blank (10) at such a distance from the first end of the blank (10) that corresponds to the length of the support part (2B) in the mold housing. 2. Method according to patent claim 1, characterized in that the strain relief (14) is created in the blank (10) using a press tool (6), which press tool (6) includes the production tool (1) with the mold housing (2), and that the blank (10) during pressing is held in place with the help of at least one reading part (8a, 8b). O 25 ro 3. Method according to patent claim 1 or 2, characterized by — that the blank (10) before the production of the strain relief (14) = is locked in place with the help of the locking parts (8a, 8b), which locking parts (8a, 8b) are located at a distance (13) from the preparation tool (1). © N 4. Method according to patent claim 3, characterized by the fact that the distance (13) between the production tool (1) and the reading parts (8a, 8b) before the production of the strain relief (14) is adjusted using adjustment parts (7). 5. Method according to any of the preceding patent claims 2 - 4, characterized in that the strain relief (14) is created in the blank (10) by pouring the blank (10) into place and by setting the forming tool (1) in motion in the direction of the reading parts ( 8a, 8b). 6. Method according to one of the preceding patent claims, characterized in that the strain relief (14) is created in the blank (10) in a conical forming part (2A) in the mold housing (2). 7. Method according to one of the preceding patent claims, characterized in that in the production tool (1), in a drill bit (11), before the production of the strain relief (14), a support member (12) is fitted which is also fitted into the part of the blank ( 10) which is in the mold housing (2). 8. Method according to one of the preceding patent claims, characterized in that the strain relief (14) is created in a fuel intake pipe. O 25 ro 9. An apparatus for producing in a tubular blank (10) a strain relief which is integrated with a tube and intended for the strain relief of a hose, which apparatus includes a production tool (1) with a mold housing (2) S 30 which has a conical molding part (2A) to expand the blank = (10) outer diameter the space that the mold housing (2) forms, N characterized by the mold housing (2) having a substantially cy- slender support part (2B) extending from the other end of the forming part (2a) of the mold housing (2) and extending down to the other end of the mold housing (2) and whose diameter is substantially the same as the outer diameter of the unexpanded blank (10), and that the blank ( 10) the first end before the production of the strain relief (14) is arranged to fit into the production tool (1), in the mold housing (2), and to be supported against the other end of the support part (2B) in the mold housing (2). 10. Apparatus according to patent claim 9, characterized in that the apparatus includes at least one reading part (8a, 8b) and a press tool (6) to which the production tool (1) with the mold housing (2) is connected. 11. Apparatus according to claim 9 or 10, characterized in that the production tool (1) and the reading parts (8a, 8b) are placed at a distance (13) from each other, and that the production tool (1) is arranged to be pressed against the reading parts (8a, 8b) using the press tool (6). 12. Apparatus according to one of the preceding patent claims 9 - 11, characterized in that the production tool (1) has a threaded fastening part (4) by means of which the production tool (1) is fixed in the press tool (6). O 25 ro 13. Apparatus according to patent claim 12, characterized in that = the fixed part (4) is surrounded by one or more separate adjusting parts I (7) to adjust the distance (13) between the production + tool (1) and the reading parts (8a, 8b). p 30 LO = 14. Apparatus according to any of the preceding patent claims 9 N - 13, characterized in that through the manufacturing tool's (1) central axis runs a borehole (11) into which a pin-like support member (12) can be fitted. N O N O <Q I jami a oO + PP LO 00 o N