JPS61272072A - Production of injection ski board - 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 Field of the Invention The present invention relates to a method of manufacturing an injection ski in which a protrusion in the shape of a high chevron or other arbitrary shape is provided on the upper surface of the ski.

2. Prior Art Conventionally, skis have been made of wood, FRP, metal, glass, etc.

In ancient times, wooden skis were often made with a raised top to maintain their strength, but as they were heavy, had poor maneuverability, and lacked bending rigidity, they gradually became more flat. In addition, skis have been replaced by high-performance skis made of FRP and metal. Nowadays, as shown in Fig. 6, the thickness of the ski I is tapered on both sides, gradually increasing in thickness from the tip to the center and gradually becoming thinner from the center to the rear end. In addition, skis having a flat top surface are becoming popular.

As for the structure, as shown in Fig. 7, there is a sandwich structure in which reinforcing members 2' such as FRP boards are arranged on the upper and lower surfaces of the core material, and a box structure in which reinforcing members are arranged around the entire circumference of the core material. is publicly known.

These structures are commonly used by ski manufacturers because the manufacturing process is easy.

However, when considering skis from the viewpoint of physical properties,
The extremely difficult problem was how to balance and balance the mutually influencing characteristics of each other, such as torsional strength, bending strength, vibration damping, and air resistance.

For example, if the torsional strength of a ski is increased toward the hill, the bending strength will increase, resulting in a ski with a stiff waist.
The vibration damping properties were also reduced, which had a negative effect on the sliding performance.

In addition, in order to reduce the air resistance of skis while skiing, by making holes of arbitrary shapes in the seal bell at the tip of the ski, and by lowering the rise of the seal bell, Efforts have been made to suppress air resistance as much as possible to increase the speed during sliding, but these methods have the disadvantage that the manufacturing process is labor-intensive and increases manufacturing costs. Therefore, in order to improve the drawbacks of these conventional skis, the present inventors installed a sliding surface material 13 and a steel edge in the lower mold 10a for forming skis, as shown in FIGS. 8 to 1O. 14. A lower surface component 16 consisting of a lower surface reinforcing member 15 and the like is arranged, and then an upper surface component 19 consisting of an upper surface material 17 and a reinforcing member 18 and the like is formed in advance into a chevron-shaped roof portion having the top at the center of its width. After placing the upper mold 10b in the notch step C of the lower mold, the upper mold 10b having a shape that matches the roof shape of the upper surface component 19 is placed, and the upper mold 10b is placed between the lower surface component 16 and the upper surface component 19. We have invented a manufacturing method in which foamed synthetic resin is injected into the hollow part 21 and foamed and hardened to form an integral part.

(Unexamined Japanese Patent Publication No. 58-163385) In addition, as shown in FIG.
After arranging the lower surface constituent member 26 consisting of the sliding surface material 23, steel edge 24, reinforcing member 25, etc. within 0a, and then arranging the upper surface constituent member 29 consisting of the upper surface material 27, reinforcing member 28, etc., the chevron roof portion is The upper mold 20b with the chevron-shaped concave portion 22 to be formed is placed, and a foamed synthetic resin is injected into the hollow portion 31 formed between the lower surface component 26 and the upper surface component 29 and foamed and hardened. Component 2
We have also invented a method for manufacturing a ski in which the protrusion 2 is simultaneously integrally formed on the upper surface of the ski by aligning the protrusion 2 with the chevron-shaped recess 22 of the mold 2ob. (Unexamined Japanese Patent Publication No. 60-21775) The skis manufactured by these manufacturing methods by the present inventors exhibit various good characteristics that cannot be obtained with conventional skis with a flat top surface. .

Problems to be Solved by the Invention However, in the former manufacturing method, it is necessary to first preform the upper surface component 19 to form the chevron-shaped roof portion, and therefore a preforming process and a preforming mold are required. However, the disadvantage is that the cost is a little high, and the process of placing the upper mold so that it matches the chevron-shaped roof of the upper surface component placed in the lower mold is time-consuming. There were some problems, such as only being able to supply skis.

Therefore, the latter manufacturing method was also devised, but in this case, the foaming pressure when injecting the foamed synthetic resin into the hollow part formed between the upper surface component and the lower surface component and curing the foam, The upper surface component is made to fit into the chevron-shaped recess of the mold, and the chevron-shaped roof is simultaneously molded on the upper surface of the ski. It is difficult to obtain sufficient pressure with just the foaming pressure when injecting the foamed synthetic resin into the mold, and it is difficult to match the upper surface components according to the mold, so the shape of the roof shape and the position where foaming pressure is most likely to be applied are determined. and the type of top reinforcing member,
There were also problems such as the inability to freely select the thickness.

The present invention improves these problems, further reduces manufacturing costs, and has characteristics that are optimal for use by skiers from beginners to advanced skiers in terms of performance, as well as an inexpensive and durable injection molding system. It was made for the purpose of supplying skis.

Means for Solving the Problems An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. When injection molding a ski board, a gap A is created in which the upper material 7 and the injected foamed synthetic resin can freely pass through the mold 10 for ski molding, which has a recess 12 corresponding to the protrusion 2 of an arbitrary shape. ,
Alternatively, an upper surface structural member 9 consisting of an upper surface reinforcing member 8 provided with a through hole A, a sliding surface material 3, a steel edge 4,
After arranging the lower surface component 16 (and side plate) consisting of the lower surface reinforcing member 5, etc., the mold is clamped, and the foamed synthetic resin is injected into the hollow part 11 formed by the upper surface component. An injection ski characterized in that the upper surface material is made to match the arbitrarily shaped four parts 12 of the mold 10 by the foaming pressure of the resin, and the protruding parts 2 of the shape corresponding to the recesses are simultaneously and integrally molded on the upper surface of the ski. Board↓
This is a manufacturing method. That is, as shown in FIG. 2, a top surface reinforcing member 8 made of a fiber-reinforced plastic plate having a curing agent gap A is arranged and a foamed synthetic resin is injected, so that the foamed synthetic resin becomes the top surface reinforcement. Gap A between members
Since the foam passes through and foams, and the foaming pressure is applied only to the top material 7, the top material 7 closely follows the recesses of the mold, making it easier to form protrusions on the top surface. In the present invention, the reinforcing fibers forming the fiber-reinforced plastic plate having the gap A include lath fibers, carbon m fibers, aramid #a fibers, poron fibers, alumina fibers, silicon carbide fibers, fine metal wires, and others. Any reinforcing fiber can be used alone or in a suitable mixture. As described above, in the injection ski manufacturing method of the present invention, the upper surface component 9 is formed. Since a member having a gap A is used for the upper surface reinforcing member 8 so that the foamed synthetic resin can pass through, the gap A is formed between the upper surface component 9 and the lower surface component 6 after each component is placed in the mold. By injecting the foamed synthetic resin into the hollow part 11, the foamed synthetic resin passes through the gap A formed in the upper surface reinforcing member 8, and due to the foaming pressure and reaction heat generated at that time,
It is possible to form the protrusion 2 in a chevron-shaped or other arbitrary shape very easily on the upper surface of the ski. Furthermore, since these gaps A do not obstruct or restrict the flow of the foamed synthetic resin injected into the mold, the foamed synthetic resin can wrap around well and have good adhesion to other members. and,
Since foaming pressure is directly applied only to the top material, sufficient internal pressure is applied along the concave portion of the mold, making it easy to mold the desired protrusion shape.

Embodiment As another embodiment of the present invention, as shown in FIG. 4, it is also possible to use reinforcing fibers having an appropriate gap A between the upper surface components without being impregnated with resin. Further, as shown in FIG. 5, the upper surface reinforcing section 8 may be made of a normal fiber-reinforced plastic plate, a plastic plate, a metal plate, or the like with appropriate holes A provided therein. In addition to making the hole the entire ski, or just the protruding part on the top surface, or all the places other than the fastener attachment position, you can change the size of the hole arbitrarily to improve the ski itself. The rigidity can be changed freely, and the degree of freedom in design is significantly improved.

Effects As described above, in the method of the present invention, there is no need to preform the upper surface component to form the protrusion as in the conventional method, and moreover, resin is used as the upper surface reinforcing member 8 of the upper surface component 9. Since the member is provided with an appropriate gap A or hole A through which the foamed synthetic resin can pass through, the foamed synthetic resin can wrap around easily, and its adhesion to other parts is also increased. Even if it is placed without bonding with 7,
Since the parts are bonded and integrated at the same time as molding, the preforming process of the upper surface component 9, the preforming mold, the adhesion process of the members, etc. are not necessary, which saves labor and reduces manufacturing costs.

Furthermore, since the foaming pressure is applied directly only to the upper surface material 7, the rigidity of the upper surface component member is too high as in the conventional case.
It is difficult to match the upper surface component to the concave part of the mold with foaming pressure alone, so the shape of the protruding part 2 is not limited to the shape on which the foaming pressure is easily applied, and the position or range of the protruding part 2 can be freely changed. Since it becomes possible to determine the performance required by skiers, it is possible to design skis that more closely match the performance required by skiers.

Furthermore, the type and thickness of the top material 2, the type and thickness of the top reinforcing member 8, the type of reinforcing fibers, etc. can be freely selected.

Therefore, by appropriately selecting and designing the position, range, and shape of the protrusion 2 and the thickness, type, etc. of the upper surface reinforcing member 8, the bending rigidity, torsional rigidity, and vibration absorption properties of the ski can be differentiated. , it is possible to design the skis to be flexible and hard, it is possible to supply skis that best suit the characteristics required by skiers from beginners to advanced skiers, and it is possible to manufacture skis that are inexpensive and durable. .

[Brief explanation of the drawing]

′:! Figures IJ1 to 3 show an embodiment of the ski according to the present invention, where Figure 1 is an overall perspective view, and Figure 2 shows an upper surface reinforcing member impregnated with resin, and the upper surface material is molded with the foaming pressure of a foamed synthetic resin. FIG. 3 is a partially cutaway explanatory sectional view after molding; FIGS. 4 and 5 are other embodiments of the ski according to the present invention; FIG. Figure 5 is a molding process diagram showing how the top material fits into the recess of the mold using the foaming pressure of the foamed synthetic resin when using a top reinforcing member that is not impregnated with resin. 6 to 10 are perspective views illustrating a conventional ski. Yu...ski board, 2. warp/protruding part, 3. fist/gliding surface material, 4...-steel edge, 5... lower surface reinforcing member, 6
・Bottom surface component, 7...Top surface material, 8...Top surface reinforcement member, 9...Top surface component, 10.Φ.Mold, 1
1...Hollow part, 12.phi.-recessed part, A-.intermediate gap or through hole, B...foamed synthetic resin. Representative Director Kenji Mizuno Department Figure 1 ^ Ir4/Correct IL Figure 3 Figure 8 Name Figure O Procedural Amendment March 1985 78 1. Indication of the incident 1985 Patent Application No. 115587 2. Name of the invention Injection ski Board manufacturing method 3, relationship with the case of the person making the amendment Patent applicant address 4, 25 Daiyo-cho, Higashi-ku, Osaka (541) Date of amendment order 7 characters next to ``A'' or ``through hole A'' join. that's all

Claims (1)

[Claims] 1. When injection molding a ski with a protrusion of an arbitrary shape on the upper surface of the ski, the upper surface material and the injected material are placed in a mold for molding the ski, which has a recess corresponding to the protrusion of an arbitrary shape. The upper surface component consists of an upper surface reinforcing member with a gap or through hole through which the foamed synthetic resin can freely pass through, and the lower surface component (and side plate) consists of a sliding surface material, a steel edge, a lower surface reinforcing member, etc. After placement, the mold is clamped, and a foamed synthetic resin is injected into the hollow part formed by each component on the upper and lower surfaces, and the foaming pressure of the foamed synthetic resin causes the upper material to fit into the arbitrarily shaped recess of the mold. A method for manufacturing an injection ski, characterized in that a protrusion corresponding to the recess is simultaneously and integrally molded on the upper surface of the ski.