JPS6031738Y2 - Gourmet for gut protection - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gut protection grommet (hereinafter abbreviated as grommet) that is inserted into a racket frame used for sports such as tennis, badminton, and squash.

Traditionally, wooden rackets have been used for racket frames used in these sports, but recently metal and fiber reinforced plastic (hereinafter abbreviated as FRP) rackets have been used.

With these metal or FRP rackets, if the string is directly stretched over the string hole drilled for stringing the string, the string will come into contact with the corner end of the string hole.
There were drawbacks such as the gut being extremely easy to break due to the impact when the ball was hit.

Therefore, for the purpose of protecting the gut, as shown in FIG.
A gourmet 3 having a collar portion 5 is already known.

However, even though this type of shaped grommet is effective in preventing the string from breaking, the grommet may fall out of the racket frame after it is inserted into the racket frame and before the string is tensioned. New problems arose, such as children jumping out.

Therefore, in order to prevent the ball from falling off, it is necessary to expand the end of the cylindrical part of the gourmet that protrudes inside the ball-striking part of the racket frame into a trumpet shape, which has disadvantages such as being very time-consuming. Was.

Furthermore, in order to prevent the gourmet from falling out even when the gourmet is inserted into the gutt hole drilled in the racket frame, a plastic gourmet with a shape as shown in Fig. 3 is also known. A tapered bulge 7 is formed in the middle part of the body, and the tapered bulge 7 is depressed at a nearly right angle just above it, so when inserting the gourmet into the racket frame, this tapered bulge will be firmly held. It gets caught on the corner end of the hole and is difficult to insert, so it is necessary to force it in. As a result, the tapered bulge 7 is deformed, and the area just above the bulge is depressed in a nearly right-angled state. As a result, the corner end of the gut hole is cut, and even if it can be temporarily locked, there is a risk that it will quickly loosen and pop out of the frame, and a sufficient effect could not be obtained.

In view of these conventional drawbacks, the present invention is an improved gourmet that can be easily inserted into a racket frame and can be reliably prevented from falling when removed.

To explain the present invention based on the drawings, as shown in FIGS. 4 and 5, when inserting the grommet 8 into the gutt hole 2 drilled in the ball hitting part of the racket frame 1, the grommet 8 is , consists of a cylindrical body 9 that is slightly longer than the thickness of the frame in the direction in which the string of the racket frame ball-hitting part is stretched, and the cylindrical body 9 has an outer diameter smaller than the hole diameter of the string hole 2 and has a string hole at one end thereof. A flange 10 larger than the diameter of the hole is formed, and a protrusion 11 of an arbitrary shape for locking is provided in a spiral shape on the outer circumferential side with a size that is large enough to block wind from the hole diameter of the gut hole 2. It is a gourmet.

As described above, when the gourmet of the present invention is molded from synthetic resin or the like, a protrusion 1 of an arbitrary shape for locking on the cylindrical body 9 of the gourmet
1 is provided in a spiral shape, so when inserting the grommet into the glut hole, unlike conventional grommet, even if the protrusion 11 gets caught in the corner end of the glut hole, it will not screw into the cylindrical body 9. The tip of the protruding part, which is circumferentially arranged in a linear shape, easily deforms due to the external force of insertion. Since there is no need for cutting, it can be inserted and inserted very easily using fingertips or a simple jig, improving work efficiency, and since the locking is reliable, there is no fear of it falling out.

In addition, in a racket frame in which an outer shell layer is formed on the outer periphery of a core made of foamed synthetic resin, two or three protrusions 11 are provided in a spiral pattern around the periphery, as shown in FIG. Since it bites well into the foamed synthetic resin core, the locking effect is further improved and there is no possibility of it falling off or popping out.

As mentioned above, the Gourmet of the present invention can be inserted into the racket frame extremely easily, resulting in high work efficiency.
It is possible to supply a gourmet for protecting the strings, which is securely inserted and locked into the racket frame so that there is no risk of it falling off.

[Brief explanation of the drawing]

FIG. 1 is a front view of the racket frame. FIGS. 2 and 3 are enlarged cross-sectional perspective views of main parts showing a state in which a conventional gourmet is inserted. FIG. 4 is an enlarged cross-sectional perspective view of a main part showing a state in which the gourmet according to the present invention is inserted. FIG. 5 is a perspective view showing an embodiment of the gourmet according to the present invention. FIG. 6 is a perspective view showing an embodiment of the gourmet according to the present invention. 1... Racket frame, 2... Gut hole, 3... Gourmet, 4... Cylindrical part, 5... Flam part, 6... Gut insertion hole, 7... Taper bulge, 8... Gourmet, 9... Cylindrical body, 10... Flange portion, 11... Spiral protrusion, 12... Gut insertion hole.

Claims (1)

[Scope of utility model registration request] A cylindrical body that is slightly longer than the thickness of the frame in the direction in which the string of the ball-striking part of the racket frame is stretched, and a flange that has a larger diameter than the string hole, and the cylindrical body has a smaller diameter than the string hole and has a cylindrical body on its outer peripheral surface. A gourmet for protecting a guttet, characterized in that an arbitrary number of protrusions of an arbitrary shape can be formed in a spiral shape with a size large enough to block wind from the hole diameter of the guttet hole.