JPS62102289A - Manufacture of drum head - 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 Industrial Application] The present invention relates to a novel method for manufacturing a drum head.

[Conventional technology]

The drum head of a drum, which is a percussion instrument, is conventionally as shown in Fig. 5, in which a flat circular piece of leather is formed in advance into a trapezoid shape with a curved peripheral edge as shown at 22 using a vacuum forming machine, etc. It was made by volatilizing the lower edge into the inner surface of the U-shaped ring and fixing it with adhesive 23.

This manufacturing method is complicated because it requires forming each piece of leather into an inverted tray shape as shown at 22 using a vacuum forming machine, etc., and it is also necessary to inject and harden a strong adhesive into the ring. However, it was also troublesome to accurately attach and secure the leather inside the ring. Furthermore, even drum heads obtained through the use of adhesives sometimes have insufficient adhesive strength, and the leather often comes off from the ring during use.

[Problem that the invention seeks to solve]

The purpose of the present invention is to make it possible to use flat round leather as is, and to eliminate the need for pre-forming the leather and using adhesives.
Moreover, the leather is automatically formed into an upside-down tray shape, and a drum head that is extremely firmly attached to the ring is obtained.
An object of the present invention is to provide a new and extremely simple method for manufacturing a drum head.

[Means for solving problems]

The present invention provides a method for manufacturing a drum head in which leather is stretched on a ring, in which a ring having a rectangular cross-section is placed in contact with the outer edge of a trapezoidal leather molding mold having a curved peripheral edge with the opening facing upward; A flat circular leather is placed on the mold and the b-shaped ring, and then a fitting ring with a rectangular cross section that is in close contact with the inner surface of the inner wall of the mold ring is placed over the flat circular leather. Press and fit the flat leather inward to sandwich and fix the periphery of the flat circular leather between the inner surface of the mold ring and the fitting ring, and fold the high part of the outer wall of the mold ring inward. The present invention relates to a method of manufacturing a drum head characterized by closing a mold ring.

The present invention will be specifically described below with reference to the drawings.

1 to 3 are cross-sectional views showing an embodiment of the manufacturing process of the present invention.

FIG. 1 is a sectional view showing the arrangement of each member in the first step of manufacturing the drum head of the present invention.

In the figure, 1 is a ring with a rectangular cross section. 2 is a fitting ring with a rectangular cross section. This rectangle is not necessarily a strict rectangle, and the corners may be rounded. 3 is a flat circular piece of leather.

As shown in the figure, the b-type ring 1 is placed horizontally in a ring-shaped recess of a mold 4 having an ring-shaped recess with its opening facing upward. The leather 3 is placed on the upper surface of the mold 4 and on the upper edge of the outer wall 12 of the ring 1. Leather 3 is not shaped in any way other than being cut into a flat circle. 5 is a ring for pressing the fitting ring 2 to fit into the ring 1, and 6 is a pressing tool for the ring 5.

In the raw material and forming tool arranged as shown in Fig. 1, the pressing tool 6
By pushing in from above, it will be in the state shown in Figure 2 at -.

Note that a jig has been devised to ensure that the fitting ring 2 is inserted into the inner surface of the b-shaped ring by pressing with the pressing tool 6.
The explanation will be omitted.

FIG. 2 is a sectional view showing a state in which the fitting ring is fitted into the type 1 ring. The flat circular leather 3 is molded into an inverted tray-shaped raised shape composed of the inner curved surface 41 of the b-shaped ring of the mold 4 and the circular flat part 42 at the center, and is fitted into the b-shaped ring 1. It is sandwiched between rings 2 and firmly fixed.

By tapping and pressing with the pressing tool 6 in one go, the flat circular leather is formed into an inverted tray shape and fitted and fixed into the ring at the same time.

The next step is to close the ring by caulking the part of the outer wall 12 of the b-shaped ring 1 that is higher than the inner wall 11 at right angles to the inside of the outer wall of the ring 1, and then attach the leather 3 at the end of the wall 11 and the end of the wall 12. In this process, a completed drum head is obtained.

This caulking work can be easily carried out by, for example, rotating the ring shown in FIG. 2, placing an object against the top of the outer wall 12 of the ring 1 from the side, and applying force.

FIG. 3 shows a cross-sectional view of the finished drum head obtained as a result.

FIG. 4 shows a plan view corresponding to FIG. 2. In the figure, 1 is a ring with a rectangular cross section. Reference numeral 11 indicates the inner wall of the ring 1, and 12 indicates the outer wall of the ring 1, both of which have their upper end surfaces visible.

2 is an inset ring, and 3 is leather. The peripheral edge of the leather 3 is firmly clamped and fixed between the inner surface of the fitting ring 2 and the inner surface of the inner wall 11 of the b-shaped ring 1. There may be some gap between the outer wall 12 of the ring 1 and the fitting ring 2. The jagged-looking 31 indicates the peripheral end of the leather 3.

Both rings 1 and 2 may be closed rings, and -
A ring with some cuts is also fine.

In the present invention, the ring 1 can be easily manufactured by melt extrusion of a raw metal from a gou having a cavity in the shape of the ring 1, for example, and a roll with parallel grooves cut on one side of a metal flat coil and a roll without grooves are used. It may also be manufactured by passing it between interlocking rolls to cut a groove and bending it into a b shape.

The material of the ring 1 is not particularly limited, but typically, for example, aluminum, iron, or other metals are used.
Engineering plastics are also used. The material of the fitting ring 2 is also the same.

There is no particular limitation on the leather, and animal hides, tough plastic films, etc. can be used, but synthetic fiber woven fabrics, synthetic fiber woven fabrics and glass fiber woven fabrics, and/or carbon fibers, which the present inventor has invented and applied for, may be used. Leather made of a laminated fabric with a woven fabric reinforced with an adhesive is most preferably used.

In particular, since it is difficult to form leather made from the latter laminated cloth in advance into a tray shape, it can be said that the method of the present invention has made it possible for the first time to easily use it as leather for drum heads.

In the present invention, the term "drum" refers to ten bunnies, bass drums, bongos, punch drums, and the like.

Although it is not directly related to the method of the present invention, in the finished drum head, the leather 3 will be stronger if the inner surface of the b-shaped ring 1 is provided with ring-shaped grooves running in parallel. It is desirable because it is fixed. For example, in the case of a drum head with a diameter of 14 inches, the leather gripping force of such a drum head is such that it can withstand a pressing force of 100 kg or more applied to the center of the leather 3, and no matter how many times the drum is hit, the leather 3
It almost never comes out.

[Effect]

With the present invention, by simply pushing the fitting ring into the b-shaped ring at room temperature, the leather is molded by the mold at the same time as the fitting, and is firmly fixed inside the ring, and is attached to the ring in the shape of an upside-down tray. be done.

The outer wall 12 of the mold ring is caulked inward and the leather 3 is sandwiched between the end of the inner wall 11 and the drum head manufacturing process of the present invention is completed.

〔Effect of the invention〕

According to the method of the present invention, there is no need to form the leather into a tray shape in advance (there is no need to use adhesives, and there is no need to glue the leather into the ring). A drum head fixed to the ring in the shape of an upside-down tray is completed by pressing and fitting in one shot and caulking the upper part of the outer wall 12 inward.

The fixing force of the leather is, for example, 100% to the center of the tea towel.
It is strong enough to withstand a pressing force of kg. Further, according to the method of the present invention, it is possible to use leather made of a material that is not easily molded.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are cross-sectional views showing the manufacturing process of the drum head of the present invention. FIG. 4 is a plan view corresponding to FIG. 2, and FIG. 5 is a sectional view showing a conventional drum head. In the figure, 1...Ring 11 with an original square cross section...Inner wall 12 of ring 1...Outer wall 2 of ring I...Insertion ring 3...Leather 31...Edge of tea room Part 4...Molding mold 41...Peripheral curved surface part 42 of the molding mold...Central flat part 5 of the molding mold...Press ring 6...Ring press tool 21...Ring (Conventional product) 22... Molded leather (Conventional product) 23... Adhesive (Conventional product) Figure 1 Figure 5 Figure 4 Procedural amendment (voluntary) January 29, 1988 Commissioner of the Patent Office Black 1) Mr. Akihiro 1, Indication of the incident, 1985 Patent Application No. 243608 2
, Name of the invention Method for manufacturing drum heads 3, Relationship with the person making the amendment Patent applicant: Hayashi Ken 4, 2-36-8 Higashi-Nakano, Nakano-ku, Tokyo Agent: Katsushin, 3-7 Yotsuya, Shinjuku-ku, Tokyo Building 5B Postal code 160 Phone 03-359-85306, ? ! Full text of the correct subject specification 7, Contents of the amendment (as attached) Specification 10 Name of the invention Method for manufacturing a drum head 2, Claims (1) In a method for manufacturing a drum head in which a ring is covered with leather , a ring with a dish-shaped cross section is placed in contact with the outer edge of a trapezoidal leather forming mold having a curved peripheral edge with the opening facing upward;
Place a flat circular piece of leather on the mold and dish ring,
Then closely to the inner surface of the inner wall of the concave ring.
Pressing and fitting the fitting ring into the dish-shaped ring from above the flat-circular leather, and sandwiching and fixing the periphery of the flat-circular leather between the inner surface of the dish-shaped ring and the fitting ring. A method for manufacturing a drum head characterized by: 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a novel method for manufacturing a drum head. [Prior Art] The drum head of a drum, which is a percussion instrument, is conventionally as shown in FIG. The lower edge was inserted into a concave ring 21 and fixed with an adhesive 23. This manufacturing method is complicated because it requires forming each piece of leather into an inverted tray shape as shown at 22 using a vacuum forming machine, etc., and it is also necessary to inject and harden a strong adhesive into the ring. However, it was also troublesome to accurately attach and secure the leather inside the ring. Furthermore, even drum heads obtained through the use of adhesives sometimes have insufficient adhesive strength, and the leather often comes off from the ring during use. [Problems to be Solved by the Invention] The object of the present invention is to make it possible to use flat circular leather as is, and to eliminate the need for pre-forming the leather and using adhesives.
What's more, the leather is automatically formed into an upside-down tray shape, and the throat of the drum is extremely firmly fixed to the ring.
An object of the present invention is to provide a new and extremely simple method for manufacturing a drum head. [Means for Solving the Problems] The present invention provides a method for manufacturing a drum head in which leather is stretched over a ring, in which a ring having a concave cross section is brought into contact with the outer edge of a trapezoidal leather molding mold having a curved peripheral edge. Place a flat circular piece of leather on top of the mold and the recessed ring, and then place a fitting ring that fits into the cough recess closely against the inner surface of the inner wall of the recessed ring. Manufacture of a drum head characterized by pressing and fitting into the concave ring from above the circular leather to sandwich and fix the peripheral edge of the flat circular leather between the inner surface of the lip ring and the cough fitting ring. It is about the method. The present invention will be specifically described below with reference to the drawings. 1 to 3 are cross-sectional views showing an embodiment of the manufacturing process of the present invention. FIG. 1 is a sectional view showing the arrangement of each member in the first step of manufacturing the drum head of the present invention. In the figure, reference numeral 1 denotes a ring with a rectangular cross section, which is an example of a ring with a concave cross section. In the case of a concave shape, as will be described later, after the fitting ring is fitted and fixed to the ring together with the leather, one high side wall portion can be caulked to cover the upper part of the fitting ring, so this is a preferable example. 2 is a fitting ring with a rectangular cross section. This rectangle does not necessarily have a strict meaning, and the corners may be rounded. Further, when the concave cross section has no corners, the cross section of the fitting ring must naturally have no corners in order to fit into the ring. 3 is a flat circular piece of leather. As shown in the figure, the L-shaped ring 1 is placed horizontally in a ring-shaped recess of a mold 4 having a ring-shaped recess with its opening facing upward. The leather 3 is placed on the upper surface of the mold 4 and on the upper edge of the outer wall 12 of the ring 1. Leather 3 is not shaped in any way other than being cut into a flat circle. 5 is a ring for pressing the fitting ring 2 to fit into the ring 1, and 6 is a pressing tool for the ring 5. In the raw material and forming tool arranged as shown in Fig. 1, the pressing tool 6
By pushing in from above, it will be in the state shown in Figure 2 at -. Note that a jig has been devised to ensure that the fitting ring 2 is fitted into the b-shaped ring 1 by pressing with the pressing tool 6, but its explanation will be omitted. FIG. 2 is a sectional view showing a state in which the fitting ring is fitted into the b-shaped ring. The flat circular leather 3 is molded into an inverted tray-shaped raised shape composed of the inner curved surface 41 of the b-shaped ring of the mold 4 and the circular flat part 42 at the center, and is fitted into the b-shaped ring 1. It is sandwiched between rings 2 and firmly fixed. With one push of the pressing tool 6, the flat circular leather is formed into an inverted tray shape and fitted and fixed into the ring at the same time. The next step is to close the ring by caulking the part of the outer wall 12 of the b-shaped ring 1 that is higher than the inner wall 11 at right angles to the inside of the outer wall of the ring 1, and then attach the leather 3 at the end of the wall 11 and the end of the wall 12. In this process, a completed drum head is obtained. This caulking work can be easily carried out by, for example, rotating the ring shown in FIG. 2, placing an object against the top of the outer wall 12 of the ring 1 from the side, and applying force. FIG. 3 shows a cross-sectional view of the finished drum head obtained as a result. FIG. 4 shows a plan view corresponding to FIG. 3. In the figure, 1 is a ring with a cross-sectional opening. Reference numeral 11 indicates the inner wall of the ring 1, and 12 indicates the outer wall of the ring 1, both of which have their upper end surfaces visible. 2 is an inset ring, and 3 is leather. The peripheral edge of the leather 3 is firmly clamped and fixed between the inner surface of the fitting ring 2 and the inner surface of the inner wall 11 of the b-shaped ring 1. There may be some gap between the outer wall 12 of the ring 1 and the fitting ring 2. The jagged-looking 31 indicates the peripheral end of the leather 3. Both rings 1 and 2 may be closed rings, and -
A ring with some cuts is also fine. In the present invention, the ring 1 can be easily manufactured, for example, by melt extrusion of raw metal from a die having a cavity in the shape of the ring 1, and a roll with parallel grooves cut on one side of a metal flat coil and a roll without grooves are used. It may also be manufactured by passing it between interlocking rolls to cut a groove and bending it into a b shape. The material of the ring 1 is not particularly limited, but typically, for example, aluminum, iron, or other metals are used.
Engineering plastics are also used. The material of the fitting ring 2 is also the same. There is no particular limitation on the leather, and animal hides, tough plastic films, etc. can be used, but synthetic fiber woven fabrics, synthetic fiber woven fabrics and glass fiber cloth, and/or carbon fibers, which the present inventor has invented and applied for, are also suitable. Leather made of a laminated fabric with a woven fabric reinforced with an adhesive is most preferably used. In particular, since it is difficult to form leather made from the latter laminated cloth into a tray shape in advance, it can be said that the method of the present invention has made it possible to easily use it as leather for drum heads for the first time. In the present invention, the term "drum" refers to ten bunnies, bass drums, bongos, punch drums, and the like. Although it is not directly related to the method of the present invention, in the finished drum head, the leather 3 will be stronger if the grooves running in a ring shape are provided in parallel on the inner surface of the ring 1. It is desirable because it is fixed. For example, in the case of a drum head with a diameter of 14 inches, the leather gripping force of such a drum head is such that it can withstand a pressing force of 100 kg or more applied to the center of the leather 3, and no matter how many times the drum is hit, the leather 3
It hardly ever starts to bulge. [Function] In the present invention, by simply pushing the fitting ring into the concave ring at room temperature, the leather is molded by the mold at the same time as the fitting, and is firmly fixed in the ring, and the ring is raised in the shape of an upside-down tray. will be installed on the In the case of a diamond-shaped ring, the outer wall 1
2 is caulked inward and the leather 3 is sandwiched between the end of the inner wall 11 and the drum head manufacturing process of the present invention is completed. [Effects of the Invention] According to the method of the present invention, there is no need to pre-form the leather into a tray shape, use of adhesives, and the work of inserting and gluing the leather into the ring. By pressing and fitting the fitting ring in one shot at room temperature, an upside-down tray-shaped drum head fixed to the ring is completed. The fixing force of the leather is strong enough to withstand, for example, a pressing force of 100 kg to the center of the tea towel. Further, according to the method of the present invention, it is possible to use leather made of a material that is not easily molded. 4. Brief Description of the Drawings FIGS. 1, 2, and 3 are sectional views showing the manufacturing process of the drum head of the present invention. FIG. 4 is a plan view corresponding to FIG. 3, and FIG. 5 is a sectional view showing a conventional drum head. In the figure, 1...Ring 11 of original cross-sectional shape...Inner wall 12 of ring 1...Outer wall 2 of ring 1...Insertion ring 3...Leather 31...Tea edge Part 4...Molding mold 41...Peripheral curved surface part 42 of the molding mold...Central flat part 5 of the molding mold...Press ring 6...Ring press tool 21...Ring (Conventional product) 22... Molded leather (Conventional product) 23... Adhesive (Conventional product)

Claims (1)

[Claims] (1) In a method for manufacturing a drum head in which leather is stretched on a ring, a ring having a ■-shaped cross section is placed in contact with the outer edge of a trapezoidal leather molding mold with a curved peripheral edge with the opening facing upward;
Place a flat circular piece of leather on the mold and the mold ring,
Next, a fitting ring with a rectangular cross section that is in close contact with the inner surface of the inner wall of the ■-shaped ring is pressed and fitted into the ■-shaped ring from above the flat-circular leather, and the periphery of the flat-circular leather is inserted into the ■-shaped ring. A method for manufacturing a drum head, which comprises closing the ■-shaped ring by sandwiching and fixing the drum head between the inner surface and the fitting ring, and folding the high part of the outer wall of the ■-shaped ring inward.