JP4752501B2 - Curved pipe forming clip - Google Patents

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 recess in the mold, as shown in FIG. 4, 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

  In view of this, 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 recess having a substantially U-shaped cross section in a molding die in a retaining state, by means of a ring-shaped body having an open portion. In the state in which the cut-off ring body is inserted into the mold, the cut-off ring body configuration is changed from the tube insertable / removable state in which the recessed portion and the open portion are aligned by the rotation of the cut-off ring body. The wall is in a state of preventing the tube from being pulled out and holding the tube.
(Invention of Claim 2)
The present invention relates to the invention according to claim 1, wherein a bulging portion is provided on an inner wall surface at a central portion in the moving direction of the missing annular body, and the bulging portion prevents inadvertent movement of the missing annular body with respect to the mold. I have to do it.
(Invention of Claim 3)
The present invention relates to the invention described in claim 1 or 2, and is entirely made of an elastic synthetic resin.

  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 ring-shaped body 1 which is a bent pipe forming clip CP according to Embodiment 1 of the present invention. FIG. FIGS. 3A, 3B, and 3C are front views of the partial annular body 1 and the like, and FIGS. 3A, 3B, and 3C are front views of the partial annular body 1, the mold 9, and the resin tube 8. FIG.
(Basic configuration and usage of this bent pipe forming clip CP)
As shown in FIGS. 1 and 2, the bent pipe forming clip CP holds the thermoplastic 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. It is constituted by a substantially annular C-shaped section 1 having an open portion 10. In addition, the missing annular body 1 of this embodiment is made of an elastic synthetic resin such as a fluororesin (PTFE) having a good sliding property.

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. 2 and 3, the mold 9 has a recessed portion 90 having a substantially U-shaped cross section, and the width of the recessed portion 90 is set 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 and 2, the bent pipe forming clip CP is constituted by the segmented annular body 1 having the open portion 10 as described above, and the segmented annular body 1 is external to the mold 9. From the state in which the resin tube 8 shown in FIG. 3 (a) in which the recessed portion 90 and the open portion 10 coincide with each other by the rotation of the annular member 1 in the inserted state, the constituent wall of the annular member 1 can be removed. Presses down the resin tube 8 so as to prevent the resin tube 8 from coming off as shown in FIG.

  As shown in FIG. 2 and FIG. 3, the above-mentioned chipped-off body 1 has a dimension in which the longitudinal width 1a constituting the inner space thereof substantially coincides with the height of the molding die 9 (the bulging portion 1d is provided only on the inner surface of the central portion). The side arcuate portions 1b and 1c constituting the internal space are shaped to follow the arc portion 91 of the mold 9. Further, as shown in FIG. 3, the opening portion 10 is provided in such a manner as to be biased to one side rather than the center portion of the upper wall, and its width is made to substantially coincide with the opening width of the recessed portion 90. Further, in the annular body 1, the flat surfaces 92, 92 are formed by the inner wall surface 11 a of the long piece 11 and 12 a of the short piece 12 constituting the open portion 10 in a state where it is positioned on the open portion 10 side with respect to the mold 9. Is to be pressed down.

The reason why the bulging portion 1d is provided in the partial annular body 1 is to make the partial annular body 1 always located on the side of the side circular arc portion 1c.
(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, the tube forming clip CP is attached in such a manner that the ring-shaped member 1 is extrapolated to the forming die 9 as shown in FIG. In this state, the open portion 10 and the recessed portion 90 of the mold 9 coincide.

  Next, in the above state, the resin tube 8 is pushed into the recessed portion 90 as shown in FIG. 3A, and then the ring-shaped member 1 is rotated until the state shown in FIG. In this state, the distal end portion of the long piece 11 is elastically deformed and pushed outward by contact with the arc portion 91 of the mold 9, and the side surface arc-shaped portion 1 c and the arc portion 91 are in a surface contact state. .

  Further, the ring-shaped member 1 is rotated until the state shown in FIG. Then, the mold 9 is pushed up by the elastic restoring force of the long piece 11, and the resin tube 8 pushed into the mold 9 and the short piece 12 come into contact with each other. In other words, the resin tube 8 is in a retaining state (a state in which the resin tube 8 is elastically deformed at the bent portion and a state in which the resin tube 8 is hardly elastically deformed except in the bent portion).

After heating / cooling the resin tube 8, the resin tube 8 formed from the mold 9 is removed from the mold 9 by rotating the notched annular body 1 as shown in FIG. be able to.
(Effects of using this bent pipe forming clip CP)
About the effect of “the burden on the worker is small” The work for the operator to follow the shape of the resin tube 8 to the shape of the mold 9 is to attach the ring-shaped body 1 to the mold 9 as shown in FIG. After the resin tube 8 is pushed into the recessed portion 90 of the mold 9 through the opening portion 10, the ring-shaped member 1 is simply rotated to the state shown in FIG. When the thermoforming operation is completed, the notched annular body 1 as shown in FIG. 3A is rotated in the reverse direction, and the resin tube 8 shaped from the molding die 9 is inserted into the molding die via the opening 10. Just remove it from 9.

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

Regarding the effect that “the tube is not easily scratched” In this bent pipe forming clip CP, the broken ring body 1 is made of an elastic synthetic resin such as a fluororesin (PTFE) having a good sliding property. When the resin tube 8 and the short piece 12 are brought into contact with each other, the resin tube 8 is hardly damaged.

About the effect that “the support position of the tube with respect to the forming die 9 is variable” The broken ring body 1 which is the bent pipe forming clip CP can be attached to the forming die 9 at an arbitrary position. That is, the support position of the resin tube 8 with respect to the mold 9 can be changed.
(Other)
In the above embodiment, in order to prevent the resin tube 8 from being scratched, the ring-shaped member 1 is made of an elastic synthetic resin such as a fluororesin (PTFE) that has good sliding properties. If is smooth, it is not limited to resin. That is, as long as it has elasticity, it may be made of a metal, or a metal coated with a resin coating or the like.

  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.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a method of copying a thermoplastic resin tube to a molding die using a ring-shaped body that is a bent pipe forming clip according to Embodiment 1 of the present invention. The front view of the said annular body 1 grade | etc.,. (A) (b) (c) is a front view of the said annular body, a shaping | molding die, and a resin tube. The side view of the clip conventionally used.

Explanation of symbols

CP Curved Pipe Forming Clip 1 Broken Ring 10 Opening Part 8 Resin Tube 9 Mold 90 Depressed Part 91 Arc Part 92 Flat Surface

Claims (3)

In a bent pipe molding clip that holds a tube made of thermoplastic resin or rubber fitted in a recess having a substantially U-shaped cross section in a molding die, it is constituted by a ring-shaped member having an open portion. In the state in which the hollow ring body is extrapolated to the mold, the hollow ring component wall is removed from the tube insertion / removal state in which the recessed part and the open part coincide with each other by the rotation of the hollow ring body. A clip for forming a bent pipe, wherein the clip is in a state of preventing the tube from being pressed out. 2. A bulging portion is provided on an inner wall surface at a central portion in the moving direction of the ring-shaped member, and the bulging portion prevents inadvertent movement of the ring-shaped member with respect to the mold. The bent pipe forming clip as described. The bent pipe forming clip according to claim 1 or 2, wherein the whole is made of an elastic synthetic resin.

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