JP2007176003A - Clip for molding bent pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clip for molding a bent pipe, which reduces worker's load and hardly damages a tube. <P>SOLUTION: The clip for the bent pipe is constituted so as to hold the thermoplastic resin tube 8, which is fitted in the recessed part having an almost U-shaped cross section of a mold 9, in a slip-off preventing state, and is equipped with: fixing parts 1 and 1, which are formed of an elastic metal wire having a cross-sectional shape free from a sharpened part and attached to the molding surface excepting a recessed part 90 without being shaken; and the pressing part 2 mutually connecting the fixing parts 1 and 1 and inserted in the recessed part 90 to press the resin tube 8 to the slip-off preventing state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bent pipe forming clip used when a thermoplastic resin tube or the like is formed into a predetermined two-dimensional or three-dimensional shape using a mold.

  Some piping systems are simply straight lines, but most are paths (so-called bent pipes) bent in two-dimensional or three-dimensional directions. For example, a fuel supply tube of an automobile has a three-dimensionally complicated and winding shape so as to form a fuel path while avoiding interference with other automobile parts.

  By the way, as a method of forming a bent tube, for example, there is a method of forming using a forming die having a U-shaped cross section made of a metal having excellent thermal conductivity. In this method, a thermoplastic resin tube is fitted in accordance with the recess of the mold that is bent two-dimensionally or three-dimensionally, and is heated and then cooled while maintaining this fitted state.

  Here, in the said shaping | molding die, the part with a dent width narrower than the diameter of a tube is partially formed so that a tube may not come out carelessly by the elastic restoring force of the tube itself (for example, patent document 1). ).

  However, the mold has a problem that the tube portion corresponding to the narrow recess portion is damaged when the tube is fitted and taken out. This makes it difficult to sell as a product. In addition, it is necessary to provide a portion with a narrow recess width in all the molds having different shapes.

  Therefore, without forming a portion with a narrow dent width in the mold, as shown in FIG. 9, the tube T is sandwiched in such a manner that the tube T is pressed against the mold K using a commercially available so-called leaf spring clip B. It is conceivable to prevent omission.

However, although it is possible to reduce the damage to the tube by contrivance, there is another problem that the burden on the operator's finger is very heavy due to the work of opening the pinched portion of the leaf spring clip B thousands of times a day. .
JP-A-9-164586

  Therefore, an object of the present invention is to provide a bent pipe forming clip that places a small burden on the operator and is unlikely to damage the tube.

(Invention of Claim 1)
The present invention relates to a bent pipe forming clip for holding a tube made of a thermoplastic resin or rubber fitted in a recessed portion having a substantially U-shaped cross section in a molding die in a retaining state, and having a cross-sectional shape having no sharp part. The fixed portion formed of elastic metal wire and attached to the molding die surface excluding the concave portion without looseness, and connected between the fixed portions and inserted into the concave portion to press the resin tube in a retaining state. A holding part is provided.
(Invention of Claim 2)
The present invention relates to a bent pipe forming clip for holding a tube made of a thermoplastic resin or rubber fitted in a recessed portion having a substantially U-shaped cross section in a molding die, and is formed of an elastic metal plate. A fixing portion that is attached to the molding die surface excluding the portion without looseness, and a pressing portion that is inserted into the recessed portion and presses the resin tube in a retaining state.
(Invention of Claim 3)
The present invention relates to the invention described in claim 1 or 2, wherein the fixing portion is formed so as to be wound around most of the mold surface excluding the recessed portion.
(Invention of Claim 4)
This invention relates to the invention according to any one of the first to third aspects, and has one or two pressing portions.

  When the bent pipe forming clip of the present invention is used, the burden on the operator is small and the tube is hardly damaged.

  Embodiments will be described in detail below as the best mode for carrying out the bent pipe forming clip of the present invention.

FIG. 1 is a perspective view showing a method of copying a thermoplastic resin tube 8 to a molding die 9 using a bent pipe forming clip CP according to Embodiment 1 of the present invention, and FIG. 2 shows the bent pipe forming clip CP. FIG. 3 shows an AA cross-sectional view of FIG.
(Basic configuration and usage of this bent pipe forming clip CP)
As shown in FIGS. 1 to 3, the bent pipe forming clip CP prevents the thermoplastic resin tube 8 that is elastically deformed and fitted into the recessed portion 90 having a substantially U-shaped section in the forming die 9. A pair of fixing portions 1 that are held in a state and are formed by bending a single elastic metal wire and are attached to the surface of the forming die 9 excluding the recess 90, and the pair of fixings. A pressing part 2 that connects the parts 1 and 1 and is inserted into the recessed part 90 and presses the resin tube 8 in a retaining state is provided.

Below, the thermoplastic resin tube 8, the shaping | molding die 9, and the clip CP for curved pipe shaping | molding are explained in full detail.
(Resin tube 8)
The resin tube 8 is formed of a thermoplastic resin such as nylon or polyester, and is rich in elasticity and has a cross-sectional shape that does not change greatly at the bent portion.
(About mold 9)
As shown in FIGS. 1 and 3, the mold 9 has a recessed portion 90 having a substantially U-shaped cross section. The width of the recessed portion 90 is set to be slightly larger than the diameter of the resin tube 8. In addition, the bottom portion is formed in an arc shape having a radius slightly larger than the radius of the resin tube 8. With the above-described configuration, the resin tube 8 can be firmly positioned and fixed to the mold 9 with little backlash.

  The molding die 9 of this embodiment is formed so as to remove a part of the round bar or pipe (mainly the recessed portion 90), and most of the outer surface is an arc portion 91 and both end portions thereof are The flat surfaces 92 and 92 are formed.

Further, the mold 9 of this embodiment is made of lightweight aluminum in consideration of workability.
(Curved pipe forming clip CP)
As shown in FIGS. 1 to 3, the bent pipe forming clip CP is composed of a stainless steel wire having a circular cross section having bending elasticity. 1 and one pressing part 2.

  As shown in FIGS. 2 and 3, the fixing portion 1 includes an arc-shaped main body 10 that follows the arc portion 91, a C-shaped first stop portion 11 formed on one end side of the main body 10, and a main body 10 is formed of an inverted V-shaped second stopper portion 12 formed on the other end side, and the first and second stopper portions 11 and 12 and the flat surfaces 92 and 92 of the mold 9 are engaged with each other. The bent pipe forming clip CP is prevented from rotating with respect to the mold 9.

As shown in FIGS. 2 and 3, the holding portion 2 is continuously formed in a U-shape between the portions extended from the second stopper portion 12. In this bent pipe forming clip CP, the bent portion Are all rounded and not pointed.
(About usage of this bent pipe forming clip CP)
When the resin tube 8 is fixed to the mold 9 using the bent pipe forming clip CP, the following may be performed.

  First, as shown in FIG. 3, the bent pipe forming clip CP is formed such that the main body 10 follows the outer peripheral surface of the mold 9, and the first and second stopper portions 11, 12 are the flat surfaces 92, 92 of the mold 9. In an aspect in which the contact portion 2 is further inserted and the pressing portion 2 is inserted into the recessed portion 90, an extrapolated state is set.

  Next, in the above state, the resin tube 8 is pushed into the recessed portion 90. Then, the pressing portion 2 is elastically deformed and pushed outward, and when the resin tube 8 is completely fitted in the recessed portion 90, the pressing portion 2 is elastically restored. In this state, the resin tube 8 is prevented from coming off from the mold 9 by contact with the holding part 2 (in a state where the resin tube 8 is elastically deformed at the bent portion and in a state where the resin tube 8 is hardly elastically deformed except at the bent portion, (Retained state).

After heating and cooling the resin tube 8, the resin tube 8 is extracted from the molding die 9 with a load greater than the elastic force of the holding portion 2 of the clip CP, whereby the resin tube 8 shaped from the molding die 9 is removed from the molding die 9. 9 can be removed.
(Effects of using this bent pipe forming clip CP)
About the effect that “the burden on the worker is small” The worker makes the resin tube 8 follow the shape of the molding die 9 by attaching the bending pipe molding clip CP to the molding die 9 and attaching the resin tube 8 to the molding die. It only pushes into the 9 recesses 90. When the thermoforming operation is completed, the resin tube 8 shaped from the mold 9 is simply removed from the mold 9.

  Therefore, since there is no such work as opening the clip portion having a large burden, the burden on the operator is small.

About the effect that “the tube is not easily scratched” The bent pipe forming clip CP has a circular cross-sectional shape, and the bent portions are all R-shaped and not sharp. Further, the bent pipe forming clip CP is configured such that when the resin tube 8 is pushed into and removed from the recessed portion 90 of the mold 9, the holding portion 2 is elastically deformed and pushed outward. Yes.

  Therefore, the resin tube 8 is hardly damaged when the resin tube 8 is pushed into and removed from the recess 90 of the mold 9.

About the effect that “the support position of the tube with respect to the forming die 9 is variable” It can be attached to the forming die 9 in the bent pipe forming clip CP at an arbitrary position. That is, the support position of the resin tube 8 with respect to the mold 9 can be changed.
(Embodiment similar to Example 1)
In this embodiment, as shown in FIGS. 4 and 5, the first stopper 11 is constituted by a line portion that connects the ends of the main bodies 10 and 10. It is obvious that this embodiment also has the same operation and effect as the first embodiment.

  In this embodiment, the first stopper 11 may also be provided with the pressing part 2.

  6 is a perspective view showing a method of copying the resin tube 8 to the mold 9 using the bent pipe forming clip CP of the present invention, FIG. 7 is an external perspective view of the bent pipe forming clip CP, and FIG. Shows a cross-sectional view taken along the line BB of FIG.

  As shown in FIGS. 4 to 6, this bent pipe forming clip CP holds the resin tube 8 fitted in the recessed portion 90 having a substantially U-shaped cross section in the forming die 9 in a retaining state. , A fixed portion 1 formed of a single elastic metal plate and attached to the surface of the mold 9 excluding the recessed portion 90 without looseness, and a pressing portion that is inserted into the recessed portion 90 and presses the resin tube 8 2 are provided.

  As shown in FIGS. 5 and 6, the fixing portion 1 includes an arcuate main body 10 that follows the circular arc portion 91, a first stopper portion 11 a formed on one end side of the main body 10, and the other end of the main body 10. The second stopper 12a is formed on the side, and is bent with respect to the mold 9 by the engagement between the first and second stoppers 11 and 12 and the flat surfaces 92 and 92 of the mold 9. The forming clip CP is prevented from rotating.

  The holding | suppressing part 2 is formed in the aspect extended from the 2nd stop part 12a, as shown in FIG.7 and FIG.8.

  Here, in the bent pipe forming clip CP of this embodiment, as shown in FIGS. 6 to 8, the operating portion 3 is formed to extend on the pressing portion 2, and an external force is applied to the operating portion 3. Thus, the bent pipe forming clip CP can be extracted from the mold 9 in a state where the pressing portion 2 is not in contact with the resin tube 8.

Since the bent pipe forming clip CP is configured as described above, it is apparent that the bent pipe forming clip CP has substantially the same operation and effect as the first embodiment.
(Other)
Although most of the outer surface of the mold 9 is constituted by the arc portion 91, the present invention is not limited to this.

  In the above-described embodiments and the like, the tube forming clip CP is composed of a stainless steel wire having a circular cross section having bending elasticity, but is not limited thereto. That is, if there is no sharp corner, a piano wire or steel wire other than a circular cross section may be used.

  In the above embodiment, a thermoplastic resin is used as a tube formed two-dimensionally or three-dimensionally, but a rubber (elastomer) tube bent two-dimensionally or three-dimensionally from the point of flexibility is formed. Also good.

The perspective view which shows the method of copying a thermoplastic resin tube to a shaping | molding die using the clip for curved pipe shaping | molding of Example 1 of this invention. FIG. 3 is an external perspective view of the bent pipe forming clip. AA sectional drawing of FIG. FIG. 3 is an explanatory diagram of an embodiment similar to Example 1. FIG. 5 is a top view of FIG. 4. The perspective view which shows the method of copying a resin tube to a shaping | molding die using the clip for curved pipe shaping | molding of Example 2 of this invention. FIG. 3 is an external perspective view of the bent pipe forming clip. BB sectional drawing of FIG. The side view of the clip conventionally used.

Explanation of symbols

CP bent pipe forming clip 1 fixing part 10 main body 11 first stopper part 12 second stopper part 2 holding part 3 operating part 8 resin tube 9 molding die 90 recessed part 91 arc part 92 flat surface

Claims (4)

An elastic metal wire having a cross-sectional shape that does not have a pointed portion in a bent pipe forming clip that holds a tube made of thermoplastic resin or rubber fitted in a recess having a substantially U-shaped cross section in a forming die. And a fixing part that is attached to the molding die surface excluding the concave part without looseness, and a pressing part that is connected between the fixing parts and inserted into the concave part to press the resin tube in a retaining state. The bent pipe forming clip. In a bent pipe molding clip that holds a tube made of a thermoplastic resin or rubber fitted in a concave portion having a substantially U-shaped cross section in a molding die in a retaining state, it is formed of an elastic metal plate, and the concave portion is excluded. A bent pipe forming clip provided with a fixing part that is attached to a forming die surface without backlash and a pressing part that is inserted into the recessed part and presses the resin tube in a retaining state. 3. The bent pipe forming clip according to claim 1 or 2, wherein the fixing part is formed so as to be wound around most of the mold surface excluding the recessed part. The bent pipe forming clip according to any one of claims 1 to 3, wherein there are one or two holding parts.

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