JPH07213652A - Racket frame and its forming die - Google Patents

Abstract

PURPOSE:To provide a racket frame in which a cost can be reduced by reducing working time and labor by omitting a work process and parts, and a grip part is formed in light weight and high strength. CONSTITUTION:This frame is provided with a dent 2 of string stretch part shape, a dent 3 of throat shape, a dent 4 of shaft shape, and a dent 5 of grip shape for the racket frame, and they are connected with only a pair of subject types communicating them or the subject type and an auxiliary type independently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a racket frame for a racket mainly used for hard and soft tennis, racket competition, squash, etc. (hereinafter, referred to as "tennis, etc.") and a molding die thereof.

[0002]

2. Description of the Prior Art As shown in FIG. 1, a conventional racket frame forming die for tennis or the like has a frame-shaped cavity 22 of a racket, that is, a string-shaped recess 22 and a throat-shaped recess 23 communicating with the recess. And a pair of main molds 20, 20 each having a shaft-shaped recess 24 communicating with the recess 23 and a core-shaped recess 25 communicating with the recess 24, and a string guide groove 35 of the racket frame. The racket frame material is placed in the cavity formed by the pair of main molds 20 and is formed by the side molds 21, and after hardening and molding, a desired molded product is molded, and the core part of the grip of the molded product molded There was a means such as 28, which was covered and bonded with a foamed resin body and then completed through a known finishing process. The conventional mold for the racket frame described above may not only need a means for bonding the covering body 27 of the foamed resin body to the core portion 28 of the grip of the molded racket body, but also the covering mainly made of the polyurethane resin foam. There was a defect that the body 27 was deteriorated with time and damaged, and the durability was not good despite the high production cost.

[0003]

SUMMARY OF THE INVENTION The present invention overcomes the above-mentioned defects of the conventional racket forming die, omits the work steps and parts, reduces the work time and labor, and reduces the cost, and the grip has a light weight. It is an object of the present invention to provide a racket frame with improved durability.

[0004]

The present invention has a novel means that the strings tension portion 9, the throat portion 10, the shaft portion 11 and the grip portion 7 are integrally hard-molded by the same racket frame material. . Further, the present invention is directed to at least a string-shaped recess 2 of the racket frame, a throat-shaped recess 3 that communicates with the recess 2, and a shaft-shaped recess 4 and the recess 4 that also communicate with the recess 3. Mold A having a pair of upper and lower main molds a and b which are also in communication and have the grip-shaped recess 5
A new means is to put a desired racket frame material in a racket frame-shaped cavity formed by close-opening the main molds a and b of the molding die A, and to cure and mold the desired racket frame.

[0005]

In the racket frame molding die A according to the present invention, the main molds a and b and the side molds c and c or the auxiliary molds a and d are separately molded and connected by the connecting parts. Various shapes and sizes of the grip portion 6 of the frame can be changed. Further, there is no need to fit and fix the cover 27 unlike the conventional one in which the strings stretching portion 9, the throat portion 10, the shaft portion 11 and the core portion of the grip portion of the racket frame are integrally molded.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A racket frame forming die according to the present invention will be described below with reference to a representative embodiment shown in the drawings. The main molds a and b, which are the main parts of the basic racket frame forming die A shown in FIG. 2, are the recesses 2 of the string tension portion of the racket frame, and the throat-shaped recesses of the racket frame communicating with the two. 3 and 3 the recesses 3 and 3
Shaft-shaped recesses 4 and 4 in the racket frame communicating with
Also, the grip-shaped recesses 5 and 5 communicating with the recesses 4 are communicated with each other. Further, a strings guide groove 1 is formed by the side molds c and c, and the shaft-shaped recess and the grip-shaped recess 5 are connected to each other as well as the throat-shaped recess similar to the string-extension-shaped recess of the main molds a and b. Therefore, the racket frame forming die of the present invention can provide the racket frame in which the strings tension portion 9, the throat portion 10, the shaft portion 11 and the grip portion 7 are integrally formed as shown in FIG. Therefore, like the conventional racket frame mold, the core part 2 of the grip is
It is possible to omit the step of fitting and fixing the cover 27 to the cover 8, and there is no fear that the cost is high and the durability is drastically reduced unlike the case where the cover 27 mainly made of polyurethane resin foam is used. Further, a racket frame forming die A according to another embodiment shown in FIG. 3 has a main body die a and b which are main parts of the racket frame forming die A in a desired racket frame type cavity.
Auxiliary molds d and d having the same throat-shaped recesses 3 and 3 and also the shaft-shaped recesses 4 and 4 and having grip-shaped recesses 5 and 5 in communication with each of these recesses 2, 3, 4.
And mainly the side molds c and c having the strings guide groove 1 at a portion corresponding to the strings tension portion of the racket frame, and further, the main molds a and b and / or the side mold c.
And c and / or side molds c and c are integrally connected by a connecting part (not shown), and at least different auxiliary molds d
It is replaceable with the ones with grip-shaped depressions of d and d. Further, since the strings extending portion type recess 2, the throat type recess 3 and the shaft type recess 4 and the grip type recess 5 are made to communicate with each other, from the mold A of the racket frame of the present invention, FIG. It was possible to provide a racket frame in which the strings stretching portion 9, the shaft portion 10 and the grip portion 7 were integrally formed as shown in FIG. Therefore, it is possible to omit fitting and fixing the covering body 27 to the core portion 28 of the grip like the conventional racket frame forming die (a), and the covering body 27 mainly made of polyurethane resin foam is used.
There is no fear that the cost is high and the durability is drastically reduced as in the case of the above. The main molds a and b of the molding die A of the racket frame according to the present invention may be ordinary molding material such as aluminum alloy or steel. As the racket frame material, fiber reinforced resin (so-called FRP) or carbon fiber reinforced resin (so-called CFRP) may be used.
The tape 5 may be made of natural leather, artificial leather, synthetic resin, or the like.

When the racket frame is molded in the molding die A, a known racket frame molding method, for example,
A sheet-like material in which reinforcing fibers have been impregnated with a solution of an uncured thermosetting resin before being cured and molded is cut into a predetermined size and wound around a tube to form a tubular body, and the tubular body is racketed. The frame is installed at a predetermined position in the cavity formed by the main molds a and b and the side molds c and c of the mold A, and the whole mold is heated and pressurized, and air is pressed into the tube of the tubular body. The tubular body is brought into close contact with the main molds a and b and the side molds c and c. In addition to the molding method,
It is also possible to mold without using the side molds c and c.

The racket frame according to the present invention is formed by molding the hollow portion 7 as shown in FIG. 8. Particularly, in the grip portion 7, like the conventional racket frame, the outer periphery of the core portion 28 is covered. Since 27 is not fitted and fixed, it is desirable to expand the volume of the hollow portion 7 by 27 layers of the covering body.

[0009]

EFFECT OF THE INVENTION Mold A for Racket Frame of the Present Invention
Since the main molds a and b and the auxiliary molds d and d are separately formed and can be connected and exchanged freely by connecting parts,
At least the grip portion 7 having various different shapes and designs can be molded and provided. Since it is not necessary to fit and fix the cover 27 of polyurethane resin foam mainly as in the case of molding with a conventional racket frame molding die, not only can the production cost be increased, but also the cover 27 is provided. As described above, a racket frame can be completed in which the grip 26 does not have a sudden decrease in durability.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an upper surface side of one or more main molds of a mold for a conventional racket frame.

FIG. 2 is a schematic plan view showing the upper surface side of one of the main molds of the mold of the racket frame of the basic embodiment according to the present invention.

FIG. 3 is a schematic plan view showing the upper surface side of one of the main molds of the mold for the racket frame of another embodiment according to the present invention.

FIG. 4 is a schematic plan view of a racket frame molded by a conventional molding die.

FIG. 5 is a schematic plan view of a racket frame molded by a molding die according to the present invention.

FIG. 6 is a schematic plan view of a racket according to the present invention.

FIG. 7 is a schematic cross-sectional view of a grip portion of a conventional racket.

8 is a schematic cross-sectional view taken along line XX of the racket shown in FIG. 6 according to the present invention.

FIG. 9 is a schematic enlarged cross-sectional area diagram of a mold according to the present invention in a state where it is about to be cured and molded.

FIG. 10 is an enlarged cross-sectional schematic view of a string stretched portion of a racket frame that is molded by a molding die according to the present invention.

[Explanation of symbols]

 A and a Mold D Backet a B and 20 Main mold c Side mold d Auxiliary mold 2, 3, 4, 5, 22, 23, 24 and 25 Recess 6 and 29 Tape 7 Grip part 8 and 30 Hollow part 9 and 31 String tension part 10 and 32 Throat part 11 and 33 Shaft part 12 Strings guide groove 27 Cover body 28 Core part

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[Procedure amendment]

[Submission date] December 19, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

[Figure 10]

[Figure 9] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 19, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

In the racket frame molding die A according to the present invention, the main molds a and b and the side molds c and c or the auxiliary molds d and d are individually molded and connected by the connecting parts. In particular, the grip portion 6 of the frame can be changed in various shapes and sizes. Further, it is not necessary to fit and fix the cover 27 as in the conventional case in which the strings extending portion 31, the throat portion 32, the shaft portion 33 and the core portion of the grip portion of the racket frame are integrally molded.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A racket frame forming die according to the present invention will be described below with reference to a representative embodiment shown in the drawings. The main molds a and b, which are the main parts of the basic racket frame forming die A shown in FIG. 2, are the recesses 2 of the string tension portion of the racket frame, and the throat-shaped recesses of the racket frame communicating with the two. 3 and 3 the recesses 3 and 3
Shaft-shaped recesses 4 and 4 in the racket frame communicating with
Also, the grip-shaped recesses 5 and 5 communicating with the recesses 4 are communicated with each other. A string guide groove 1 is formed by the side molds c and c, and a throat-shaped recess and a shaft-shaped recess and a grip-shaped recess 5 are made to communicate with the string-shaped recess of the main molds a and b. Therefore, from the mold of the racket frame of the present invention, as shown in FIG.
Strings stretched part 9, throat part 1 as shown in
It was possible to provide a racket frame in which 0, the shaft portion 11 and the grip portion 7 were integrally formed. Therefore, as in the conventional racket frame mold, the middle portion 28 of the grip is
It is possible to omit the step of fitting and fixing the cover 27 on the base plate, and there is no risk that the cost is high and the durability is drastically reduced unlike the case where the cover 27 mainly made of polyurethane resin foam is used. In addition, a racket frame forming die A according to another embodiment shown in FIG. 3 has a main body die a and b, which are main parts thereof, in a desired racket frame-shaped cavity, so that the recesses 2 and 2 of the string tension portion type are formed in the cavity. Auxiliary molds d and d, which mainly form the float-shaped depressions 3 and 3 and also the shaft-shaped depressions 4 and 4, and which have grip-shaped depressions 5 and 5 in communication with each of these depressions 2, 3, 4 and mainly The racket frame includes side molds c and c each having a string guide groove 1 at a portion corresponding to a string tension portion, and further comprises the main molds a and b and / or the side molds c and c and / or the side molds c and c. Connection part (not shown)
By means of at least one auxiliary mold d and a grip-shaped recess of d. Further, since the strings extending portion type recess 2, the throat type recess 3 and the shaft type recess 4 and the grip type recess 5 are made to communicate with each other, from the mold A of the racket frame of the present invention, FIG. As shown in, the string tension portion 9, the shaft portion 10 and the grip portion 7
It was possible to provide a racket frame integrally molded with. Therefore, it is possible to omit the fitting and fixing of the cover 27 to the core portion 28 of the grip as in the case of the conventional racket frame forming die (b), and the cost is high as in the case where the cover 27 mainly made of polyurethane resin foam is used. Moreover, there is no fear that the durability will drop sharply. The main molds a and b of the mold A for the racket frame according to the present invention may be ordinary forming mold materials such as aluminum alloy or steel. The racket frame material is fiber reinforced resin (so-called FRP).
Alternatively, a carbon fiber reinforced resin (so-called CFRP) may be used. The tape 5 may be made of natural leather, artificial leather, synthetic resin, or the like.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

When the racket frame is molded in the molding die A, a known racket frame molding method, for example,
Before hardening and molding, the reinforcing fibers are impregnated with a solution of an uncured thermosetting resin, and a sheet-shaped material is cut into a predetermined size and wound around a tube to form a tubular body 34. 34 are main molds a and b of the mold A of the racket frame
And a predetermined position in the cavity formed by the side molds c and c, and the entire molding mold is heated and pressed to form the tubular body 3
Air is pressed into the tube of No. 4 to bring the tubular body 34 into close contact with the main molds a and b and the side molds c and c. In addition to the molding method described above, molding can be performed without using the side molds c and c.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

EFFECT OF THE INVENTION Mold A for Racket Frame of the Present Invention
Since the main molds a and b and the auxiliary molds d and d are separately formed and can be connected and replaced by connecting parts, at least the grip portion 7 having various shapes and designs can be obtained.
Can be provided by molding. Since it is not necessary to fit and fix the cover 27 of polyurethane resin foam mainly as in the case of molding with a conventional racket frame molding die, not only can the production cost be increased, but also the cover 27 is provided. As described above, a racket frame can be completed in which the grip 26 does not have a sudden decrease in durability.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an upper surface side of one of main molds of a molding die of a conventional racket frame.

FIG. 2 is a schematic plan view showing the upper surface side of one of the main molds of the mold for the racket frame of the basic embodiment according to the present invention.

FIG. 3 is a schematic plan view showing one upper surface side of a main mold of a mold for a racket frame according to another embodiment of the present invention.

FIG. 4 is a schematic plan view of a racket frame molded by a conventional molding die.

FIG. 5 is a schematic plan view of a racket frame molded by a mold according to the present invention.

FIG. 6 is a schematic plan view of a racket according to the present invention.

FIG. 7 is a schematic cross-sectional view of a grip portion of a conventional racket.

8 is a schematic cross-sectional view taken along line XX of the racket shown in FIG. 6 according to the present invention.

FIG. 9 is an enlarged schematic cross-sectional view of a state where a mold for curing according to the present invention is about to be cured and molded.

FIG. 10 is an enlarged cross-sectional schematic view of a string stretched portion of a racket frame that has been molded by a forming mold according to the present invention.

[Explanation of Reference Signs] A and B Mold B Racket a, B and 20 Main mold c and 21 Side mold d Auxiliary mold 2, 3, 4, 5, 22, 23, 24 and 25 Recess 6 and 29 Tape 7 Grip part 8 and 30 Hollow part 9 and 31 Strings tension part 10 and 32 Throat part 11 and 33 Shaft part 12 Strings guide groove 27 Coating body 28 Core part 34 Tubular body

Claims (4)

[Claims] 1. A racket frame, characterized in that the strings, the stretched portion 9, the throat portion 10, the shaft portion 11 and the grip portion 7 are integrally hardened and molded from the same racket frame material. 2. A racket frame molding comprising a pair of vertically symmetrical main molds a and b forming a racket frame type cavity, and a side mold c forming a strings guide groove 12, or a pair of main molds a and b. In the mold A, the pair of main molds a and b respectively communicate with the recesses 2 and 2 of the string tension portion of the racket frame, and the throat-shaped recesses 3 and 3 and the recess 3 which communicate with the recesses 2 and 2, respectively. 3, the shaft-shaped recesses 4 and 4 and the grip-shaped recesses 5 and 5 that also communicate with the recesses 4 and 4 are molded to form the main molds a and b and the side mold c or the main mold a. Molding of a racket frame, characterized in that a desired racket frame material is put into a racket frame-shaped cavity consisting of only Type. 3. The molding die A is connected separately from the main dies a and b at a portion corresponding to the grip portion of the main dies a and b, and the depressions 2 and 2 of the main dies a and b are connected. 3. The racket frame molding die according to claim 2, further comprising auxiliary dies d and d having recesses 55 and 55 communicating with the above-mentioned parts 3, 3, and 4, 4. 4. The main molds a and b, or the main molds a and b and / or the auxiliary molds d and d of the molding die A are integrally connected or detachable by a connecting component so as to be replaceable. A molding die for a racket frame according to claim 2 or 3.