JPS6339272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing an injection molding ski filled with a foamable synthetic resin.

(Prior Art) Injection skis are known in which a gap between constituent members on the upper and lower surfaces of the ski is filled with foamable synthetic resin.

The outline of the manufacturing method for this in-edge extension ski is as shown in Fig. 1, in which a gap P corresponding to the thickness distribution of the ski core is provided in a mold 1, and an edge fitting 2 is formed in the mold 1.
This is carried out by arranging the ski lower surface component 3 and the ski upper surface component 4, and injecting and filling the gap P with a foamable synthetic resin liquid.

By the way, in recent skis, as shown in FIG. 8, the outer end surface of the edge fitting 2 is attached to the side surface 80 of the ski so that the user can freely cut and adjust the edge fitting 2.
So-called offset skis, which protrude more outward, are becoming popular. In this case, in order to reduce the risk, the lower part of the side surface 80 protrudes outward to cover the upper surface of the edge fitting 2.

To manufacture such offset-type skis using injection molding, it is necessary to form a resin inflow space in the molding die above the top surface of the edge fittings so that the resin can flow up to the top surface of the edge fittings. However, if a space is formed in this way, there is a risk that the edge metal fitting will lift up, so it is necessary to control the position of the edge metal fitting.

Conventionally, the position of the edge fitting 2 is normally controlled by placing a push pin 60 along the edge fitting 2 on the inner wall 1a of the right or left side of the mold, which abuts against the upper surface of the edge fitting 2, as shown in FIG. A plurality of push pins 60 may be used to press and fix the edge fitting 2, or as shown in FIG. A method has been adopted in which a protrusion 70 is integrally formed and the edge fitting 2 is pressed and fixed by the lower surface of the press protrusion 70.

(Problems to be Solved by the Invention) However, the following problems exist in regulating the position of the edge fittings using the conventional manufacturing method. That is, a hole or a recess formed by the push pin 60 or the push protrusion 70 remains on the side surface of the finished ski product, and water or the like penetrates therethrough, leading to rusting of the edge fittings and deterioration of sliding properties. Also,
Holes and recesses are exposed on the sides, which greatly impairs the appearance.

Therefore, the present invention solves such problems and does not cause deterioration of edges such as rust even after long-term use, provides good sliding properties, and has a good appearance and excellent marketability. The object of the present invention is to provide a method for manufacturing an injection ski, in particular, by which a ski can be obtained.

(Means for Solving the Problems) In the present invention according to the above-mentioned object, the thickness of the ski inner core is By arranging the ski lower surface component including the edge fitting and the ski upper surface component with a gap corresponding to the size distribution, and injecting and filling the foaming resin liquid into the gap, the outer end surface of the edge fitting is aligned with the ski side surface. In the method for manufacturing an offset-type in-edge extension ski in which the ski protrudes outward and the lower side of the ski protrudes above the upper surface of the edge fitting and covers the upper surface of the edge fitting, the inner walls of the right and left molds are formed on the outside of the edge fitting. It is formed to have a lower surface that comes into contact with the end surface, and an upper surface that projects inward from the lower surface through an inclined surface into the mold, and the foamable resin liquid flows onto the upper surface of the edge fitting through the space below the inclined surface. The method is characterized by securing a space and continuously pressing and fixing the edge fittings incorporated in the mold by the corners of the lower surface and the inclined surface, and then injecting and filling the foaming resin liquid into the gap. There is.

(Example) Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

First, a mold to which the method of the present invention can be applied will be explained with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of the same mold, and FIG. 2 is an enlarged view of part A in the circle in FIG. 1. The mold 1 includes a lower mold 10, an upper mold 11,
The right mold 5 and the left mold 6 are interposed between these molds 10 and 11. The right mold 5 consists of an inner right mold body 12 and an outer support mold 13, and the left mold 6 consists of an inner left mold main body 14 and an outer support mold 15.
Consisting of

The right-hand main body 12 is provided with an edge fitting 2 at a relatively lower portion thereof, according to the method of the present invention, which presses the lower surface that comes into contact with the outer end surface of the edge fitting 2 and the outer part of the upper surface.
It has a locking surface 7 parallel to the surface. This locking surface 7 is a flat surface and is provided in a stepped shape on the inner wall of the right-hand body 12. Further, the width S of the locking surface 7 is a small size of around 0.5 mm, and is formed to have approximately the same size in the longitudinal direction of the edge fitting 2. An inclined surface 12a having a predetermined width is formed from the inner end of the locking surface 7 and projects upwardly into the gap P, and the upper end of this inclined surface 12a forms an upper surface that is a substantially vertical surface. Note that the left-hand main body 14 is also formed in the same manner as the right-hand main body 12, so that they are symmetrical. In the left-hand main body 14, 8 is the aforementioned locking surface, and 14a is an inclined surface. The mold 1 constructed as described above produces an injection ski in which the lower part of the ski including the edge fitting 2 is offset outward by a predetermined width.

Next, a method for manufacturing an injection ski according to the present invention will be explained.

First, as shown in FIG.
A ski upper surface forming member 4 is disposed on the inner surface of the ski upper surface 1. The component 4 consists of an upper ABS resin sheet 30 and a lower internal reinforcing material 31 including glass cloth, etc.

On the other hand, on the inner surface of the lower mold 10, a ski lower surface forming member 3 is arranged. The component 3 includes a sole material (polyethylene) 32 on the lower side, an internal reinforcing material 33 including a glass cloth, etc., which is narrower than the sole material and located on the upper side, and is densely arranged so as to sandwich the side ends of both 32 and 33. It consists of edge metal fittings 2, 2. The edge fittings 2, 2 have locking edges 2a, 2a protruding inward on the inner upper part, and the sole material 3 is connected to the locking edges 2, 2a and the lower mold 10
2, and an internal reinforcing member 33 is interposed between each locking edge 2a.

Further, the edge fittings 2, 2 and the ski upper surface component 4 are fixed by the right mold 5 and the left mold 6, respectively. In other words, the locking surface 7 provided on the right mold main body 12 and the left mold main body 14 is a part of the outer side of the upper surface of the edge fittings 2, 2.
and 8 to fix it, as well as the right-hand body 1
2 and the upper end notch-like part of the left-hand body 14, both ends of the upper surface component 4 are clamped and fixed. In this case, the edge fittings 2, 2 are simultaneously positioned by the right mold body 12 and the left mold body 14.

By arranging each of the constituent members 3 and 4 as described above, a predetermined gap P corresponding to the thickness distribution of the ski core is formed between each of the constituent members 3 and 4.

Thereafter, a desired injection molding key can be obtained by using a known method of injecting a required resin liquid into the gap P by inserting a resin liquid injection nozzle (not shown) and foaming it.

The width of the locking surfaces 7 and 8 can also be approximately zero. That is, it is clear that the edge fitting can be pressed and fixed at the corner portion formed by the lower surface and the inclined surface of the inner walls of the right and left molds 6.

In the present invention, the term "corner" refers to a corner formed by the lower surface and the inclined surface, where the width of the locking surfaces 7 and 8 ranges from zero to about 0.5 mm.

Next, a modified embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is an enlarged view of the circle A section in FIG. 1 according to a modified embodiment, and FIG. 4 is a plan view of the lower mold of the mold according to the modified embodiment. The modified example is the example shown in Figures 1 and 2 (basic example)
The difference is that the magnet 40 embedded in the lower mold 10 attracts the lower surfaces of the edge fittings 2, 2. As shown in FIG. 4, a plurality of magnets 40 are buried at predetermined intervals along the edge fitting 2, with the spacing being particularly close at the tip of the ski (shovel portion). Further, the embedding depth is selected depending on whether the upper end surface of the magnet 40 is aligned with the upper surface of the lower mold 10, or whether it is buried slightly. In this way, the magnet 40 is attached to the lower die 10.
It is desirable that at least the lower mold 10, the right mold 5, and the left mold 6 be made of a non-magnetic material such as an aluminum alloy. Due to the attraction action of the magnet 40, the edge fitting 2 can be positioned and fixed more reliably and stably.

Next, referring to FIG. 5, another modified embodiment of the present invention will be described. This figure is an enlarged view of the circle A section in FIG. 1 according to another modified embodiment. This modified embodiment differs from the modified embodiment described above in that the ski underside component 3 is modified. In other words, as shown in FIG.
sandwich the laminated portion of the There is a possibility that the FRP board may float up when it is bent, especially at the shovel portion, etc., so it is possible to more effectively and securely and stably position and fix the board than in the basic embodiment.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

(Effects of the Invention) As described above, according to the method of the present invention, the edge fittings are held and fixed at the corners of the lower surfaces and inclined surfaces of the right and left dies, so that there are no recesses or holes in appearance. It was possible to manufacture an offset-type ski that is not exposed and has an excellent appearance using in-jet extension. Moreover, as a result, even after long-term use, rust does not occur due to penetration of water, etc., and the edge fittings do not deteriorate due to this, and it is possible to provide an in-edge extension ski that has excellent durability and excellent gliding properties. did it.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a mold to which the method of the present invention can be applied, Fig. 2 is an enlarged view of circle A in Fig. 1, and Fig. 3 is a circle A in Fig. 1 according to a modified embodiment of the present invention. FIG. 4 is a plan view of the lower part of the mold according to a modified embodiment, FIG. 5 is an enlarged view of the circle A section in FIG. 1 according to another modified embodiment of the present invention, and FIG. and FIG. 7 are internal perspective views of a mold according to a conventional example. FIG. 8 shows a cutaway sectional view of an offset type ski. 1... Molding mold, 2, 2... Edge metal fitting, 3...
Ski lower surface component, 4... Ski upper surface component, 5... Right type, 6... Left type, 7, 8... Locking surface, 12... Right type main body, 14... Left type main body, S...
...width of the locking surface.

Claims (1)

[Claims] 1. A gap corresponding to the thickness distribution of the ski core is present in a mold having a lower mold, an upper mold, and a right mold and a left mold that regulate the side surface shape of the ski with an inner wall. By arranging the ski lower surface component including the edge fitting and the ski upper surface component, and injecting and filling the foaming resin liquid into the gap, the outer end surface of the edge fitting protrudes outward from the ski side surface, and the ski upper surface component includes the edge fitting. In the method for manufacturing an offset-type index extension ski in which the inner walls of the right and left molds protrude above the upper surface of the edge fitting and cover the upper surface of the edge fitting, The upper surface protrudes from the surface into the mold through the inclined surface, and the space below the inclined surface secures a space for the foaming resin liquid to flow onto the upper surface of the edge fitting, and the lower surface and 1. A method for manufacturing an injection ski, which comprises continuously pressing and fixing an edge fitting incorporated in a mold by a corner portion with an inclined surface, and then injecting and filling a foaming resin liquid into the gap.