JPS61165598A - Manufacture of handle for western-style bow - 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 [Technical Field of the Invention] The present invention relates to a method for manufacturing a handle for a western bow whose outer shell is made of fiber-reinforced plastic (hereinafter abbreviated as FRP).

[Technical background of the invention and its problems] In general, the handle body of a Western bow is made of materials such as wood, FRP, or light metal, but any material made of any material will suffer from material fatigue and corrosion after long-term use. At the end of its lifespan, there is a high risk that the grip will break near the pivot point during use, and if the handle itself breaks, one of the separation bodies, especially the one that is not gripped, may break. It is extremely dangerous, as it often bounces back to the shooter and causes injury.

A possible measure to prevent injuries caused by the breakage of the handle mentioned above is to predict the durability of the handle in advance. This is impossible with Western bows, whose durability varies greatly depending on various factors such as string and arrow selection, frequency of use, storage location and care methods, and other environmental conditions such as the climate of the region where it is used. Currently, it is not possible to predict the period of use.

Conventional Western bows, such as Western bows with handles made of Mg alloy casting, are constructed by connecting the upper and lower parts of the handle body, centering on the grip, with a band or the like to prevent the separated body from scattering in the event of breakage. With this type of structure, when the handle body breaks during arrow firing, the broken end of one of the separate bodies connected by the band rotates due to the elastic recovery force of the rim, and It was not possible to completely prevent injuries due to the risk of jumping towards the ground.

Furthermore, recently, it has been proposed that the handle body of a Western bow is constructed from a hollow FRP outer shell structure, but in this type of structure, no measures have been taken to prevent the handle from breaking as described above.

[Object of the invention] This invention was made under the above circumstances, and is
To provide a method for manufacturing a handle for a western bow, in which a band member is inserted in the vertical and longitudinal direction of the handle core at the same time as the P outer shell is formed, thereby preventing the handle separation body from jumping toward the shooter's side in the event of breakage. This is the purpose.

[Summary of the Invention] In order to achieve the above-mentioned object, the present invention provides a structure in which a connecting member such as a band is inserted in advance in the longitudinal direction around a core.
A handle molding material is formed by adding raw FRP molding material, and the handle molding material is inserted into a mold and hot-press molded to fix the connecting member inside the handle at the same time as the handle is molded. It is characterized by the fact that it is possible to do so.

[Embodiments of the invention] The present invention will be explained below based on illustrated embodiments.

As shown in FIG. 1, reference numeral 1 in the figure is a handle body made of an FRP outer shell structure 2 molded by a manufacturing method described later. As shown in FIG. 2, the core of the outer shell structure 2 of the handle body 1 is formed of a core 3 made of foamed synthetic resin. A band-shaped, high-tension, flexible connecting member 4 is inserted vertically continuously so as to straddle the handle grip portion 1a, and both upper and lower ends 4a of the connecting member 4.

4b has a structure in which it is exposed from the core 3 and fixed to the outer shell structure 2, and as shown by the dotted line in FIG. The connecting member 4 is restrained so that the broken end portion 21a does not jump toward the shooter or rotate.

That is, in order to mold the above-mentioned handle body 1, as shown in FIGS. 3 to 5, a band or the like is connected in advance into a core component 10 made of foamed synthetic resin having a shape substantially similar to the outer shape of the handle. The member 11 is embedded in the longitudinal direction, and both ends 11a and 11b of the connecting member 11 are exposed to the outside. Next, F of prepreg or the like is placed around the core component 10.
+AF113 for handle molding is attached so as to wrap around the raw material 12 for RP molding, and molded. At this time, as shown in FIG. 4, the raw material 12 for FRP molding includes, for example, glass fiber roving in the inner layer 12a, glass tj & fiber cloth or carbon fiber cloth including hollow weave cloth in the middle 112b, and outer surface II 2c. In this case, carbon fiber rovings are used as reinforcing fibers wrapped in multiple layers. And such a handle molding material 13
is inserted into the cavity 15 of the mold 14 shown in FIG. 5, clamped, and heated and pressurized to fix both ends 11a and 11b of the connecting member 11 at the same time as FRP molding. In this case, depending on design considerations, the handle molded product may include, for example, a base material for inserting a mounting hole for screwing the stabilizer, a weight member for weight balance adjustment, or a reinforcing member to improve the strength around the rim insertion port. In order to insert and integrate a solid member of F.
When attaching the raw material for RP molding, each solid member that requires these is selectively inserted into the appropriate place between the layers of the raw material for FRP molding, and the solid members are integrated by hot pressing and molding. , which is suitable because it does not damage FRP.

By the way, in the embodiment of the present invention described above, foamed synthetic resin was used for the core 3, but it is also possible to make the core a hollow structure using the core component 1 made of an air bag. In this case, the connecting member 11 is attached along the outer surface of the core component 10, and the connecting member 11 is covered with a film cover except for both ends to prevent resin impregnation. Further, the fixing position t of both ends 118.11b of the connecting member 11 may be the central part near the grip part 1a, the handle neck, or the extreme end of the handle, and furthermore, both ends 11a, llb of the connecting member 110 are exposed. In this case, it may be wound around the outer periphery of the core component 10. In addition, the connecting member 11 may be made of leather,
Band materials such as rubber, rovings made of glass fibers, nylon and other long fibers, wires (diameter 0.5 to 5
Embroidery) etc. are preferably used.

[Effects of the Invention] As explained above, according to the present invention, a connecting member such as a band is inserted in the vertical and longitudinal direction of the core of the handle body, and both ends of the connecting member are molded simultaneously with the molding of the FRP outer shell. Because it can be fixed, it is easy to insert the connecting member into the handle, and even if the handle breaks near the grip when firing an arrow, the broken end of the separation body (
It is restrained by the connecting member and jumps toward the shooter,
Since it does not rotate, it can reliably prevent injuries and accidents, and has excellent effects such as safety.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing one embodiment of a Western bow handle according to the present invention, FIG. 2 is an enlarged sectional view of the main part, and FIGS. 3 to 5 are explanatory views showing the manufacturing process. 10... Core constituent material 11... Connection member 1ia, i, i, b, i part 12... Raw material for FRP molding 13... Material for handle molding 14... Molding mold 1) ;-- To the 11th page Figure 3 Frame Figure 4 Figure 5

Claims (2)

[Claims] (1) A handle molding material is formed by attaching raw material for FRP molding around the core component into which the connecting member has been inserted in the longitudinal direction, and the handle molding material is inserted into the mold. A method for manufacturing a handle for a Western bow, which is characterized by thermo-press molding. (2) The method for manufacturing a handle for a western bow as set forth in claim 1, characterized in that both ends of the connecting member are exposed from the core constituent material and are wrapped and fixed with green material for FRP molding. The manufacturing method.