JP2002366139A - Clamping frame for drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamping frame for a drum by which attaching/detaching work of a drum head can be performed with ease, sufficient strength toward tuning of high-tension can be secured and the drum head can be disposed spreadingly in a stable state. SOLUTION: A fixing hole 22 for a bolt disposed in a disk part 20B of the clamping frame 20 is constituted of a long hole with double blocked ends composed of a long hole part 22A in which a bolt main body of a clamping bolt is inserted and a hole part 22B which is successively disposed at one end side of the long hole part 22A and has size with which a head part of the clamping bolt can be inserted therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a drum frame used for a bass drum, a snare drum, a marting drum and the like.

[0002]

2. Description of the Related Art In a drum such as a bass drum, a snare drum, and a marting drum, a drum head is supported and tensioned by a plurality of head support tensioning means to apply a predetermined tension to the drum head.

FIG. 3 is an external perspective view showing a conventional snare drum inverted upside down, and FIG. 4 is a cross-sectional view showing a part of the main part of the drum, in which a part of the drum is open. The torso main body 2 is composed of a drum head 2 (2a, 2a).
b) Reference numeral 3 denotes a head supporting and tensioning means for the drum head 2. The head supporting and tensioning means 3 normally holds the outer peripheral edge of the drum head 2, and has an annular head frame 5 fitted on the outer periphery of the body 1, and an annular tightening member also fitted on the outer periphery of the body 1. A frame (rim) 6, a plurality of lugs 7 fixed to the outer periphery of the body 1, a tightening bolt 8 for connecting each lug 7 and the tightening frame 6, and the like. The tension of the drum head 2, in other words, the tone of the snare drum 10, is adjusted by pressing the tightening frame 6 against the head frame 5 and moving the head frame 5 in the axial direction. 2a is a front side drum head, 2b is a back side drum head,
9 is a snappy (sound line) provided on the back side drum head 2b.

The tightening frame 6 is made of a metal such as aluminum and has a L-shaped cross section, so that it is larger than the outer diameter of the body 1 and smaller than the outer diameter of the head frame 5. 6A, and a ring-shaped disk portion 6B integrally provided at an end of the cylindrical portion 6A on the body 1 side. A plurality of bolt mounting holes 11 are provided in the disk portion 6B for each tightening bolt 8. It is formed correspondingly. Bolt mounting hole 1
Reference numeral 1 denotes a round hole having a hole diameter slightly larger than the outer diameter of the bolt body 8A in which the male screw 12 of the normal tightening bolt 8 is formed, and smaller than the head 8B. There is also known a frame 6 'formed by a long hole 13 whose long end is open along the outer periphery of the frame 6'.

[0005]

However, the conventional drum tightening frames 6, 6 'have the following problems. That is, in the tightening frame 6 shown in FIG. 4, the head 8B of the tightening bolt 8 cannot be penetrated through the bolt mounting hole 11 formed of a round hole (the hole diameter is small), so that the drum head 2 is replaced. At this time, it is necessary to remove the fastening bolt 8 from the lug 7 and remove the fastening frame 6 and the head frame 5 from the body 1. When the drum head 2 is mounted, the head frame 5 and the tightening frame 6 are fitted to the body 1 and then the tightening bolts 8 are inserted into the bolt mounting holes 11.
To be screwed into a lug nut incorporated in the lug 7 to connect the tightening frame 6 to the lug 7. The installation and removal work of such tightening bolts 8 is troublesome due to the large number of the bolts, and it takes a long time to install and replace the drum head 2.

On the other hand, in the tightening frame 6 ′ shown in FIG. 5, when the tightening frame 6 ′ is rotated by a required angle, when all the tightening bolts 8 are positioned outside the elongated holes 13, the tightening frame 6 ′ is Since it can be removed from the tightening bolt 8, there is no need to remove the tightening bolt 8 from the lug 7, and the mounting and replacement work of the drum head 2 is easy and the handleability of the drum is excellent. Since the J-shaped bolt supporting piece 14 forming a rim forms a cantilevered support structure, when the tightening bolt 8 is tightened, the drum head 2 is bent and cannot be set to a desired tension. There is a problem in strength due to bending or breakage when performing tension tuning.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to make it possible to easily perform the work of attaching and detaching a drum head,
Another object of the present invention is to provide a drum tightening frame capable of securing sufficient strength for high-tension tuning and extending the drum head in a stable state.

[0008]

In order to achieve the above object, the present invention is directed to a method of fitting a lug in an opening of a body having a plurality of lugs on an outer periphery thereof and connecting the lugs to the lugs by tightening bolts. In the drum tightening frame for pressing the head frame, a bolt mounting hole provided in the disk portion of the tightening frame, a long hole in the circumferential direction of the tightening frame in which the bolt body of the tightening bolt is inserted, A hole having a size that allows the head of the tightening bolt connected to one end of the long hole to be inserted therein is formed by a long hole with both ends closed. In the present invention, when the head of the fastening bolt is moved to the hole by rotating the fastening frame by a predetermined angle, the fastening frame can be removed from the fastening bolt without removing the fastening bolt from the lug. The bolt mounting portion of the tightening frame in which the bolt mounting holes are formed has sufficient strength and can withstand high tension tuning because the bolt mounting holes are oblong holes closed at both ends.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a plan view of a drum tightening frame according to the present invention, and FIG. 2 is a view showing a mounting hole for a bolt. In these figures, the drum tightening frame 20 is
Similar to the conventional tightening frame 6 shown in FIG. 4, it is made of a metal such as aluminum and has an L-shaped cross-section, so that the outer side of the trunk body 1 (see FIGS. 3 and 4) is formed. A cylindrical portion 20A larger than the diameter and smaller than the outer diameter of the head frame 5
And a ring-shaped disk portion 20B integrally provided at the end of the cylindrical portion 20A on the body 1 side. Eight bolt mounting portions 21 having bolt mounting holes 22 in the disk portion 20B are circumferentially formed. They are provided at equal intervals in the direction.

The bolt mounting portion 21 has an arc-shaped protruding portion 21A protruding from the outer periphery of the disk portion 20B. The bolt mounting hole 22 is formed at the boundary between the protruding portion 21A and the disk portion 20B. Are formed. The reason why the projecting portion 21A is provided on the bolt attaching portion 21 is that the outer diameter of the disk portion 20B is not increased, and the bolt attaching hole 22 is formed to be separated from the cylindrical portion 20A. This is for enabling the rotation operation of No. 8.

The bolt mounting hole 22 is formed in an arc shape about the center O of the tightening frame 20 so as to be elongated in the circumferential direction of the tightening frame 20.
A at both ends constitutes an elongated hole composed of a hole 22B connected to one end of A. The width W of the elongated hole portion 22A is slightly larger than the outer diameter of the bolt body 8A of the fastening bolt 8,
And it is set smaller than the outer diameter of the head 8B. Hole 2
2B is formed in a round hole having a hole diameter D larger than the outer diameter of the head 8B of the tightening bolt 8, thereby enabling the head 8B to be inserted. For this reason, the bolt mounting holes 22
Has a substantially keyhole shape, and a desired tension is applied to the drum head 2 by pressing the tightening frame 20 against the head frame 5 with the normal tightening bolt 8 positioned in the long hole 22A.

In the tightening frame 20 provided with the bolt mounting holes 22 formed by the elongated holes closed at both ends, the tightening frame 2
When the tightening bolt 8 is positioned in the hole 22B by rotating the tightening bolt 20 to the hole 22B by a required angle, the tightening frame 20 is tightened.
Can be easily removed from. Therefore, the tightening bolt 8 is attached to the lug 7 when the drum head 2 is mounted or replaced.
The drum head 2 can be quickly mounted and replaced without having to be removed from the device or to be mounted again. Further, since the projecting portion 21A of the bolt attaching portion 21 is connected at both ends to the disc portion 20B, it has sufficient strength and does not bend or break when performing high tension tuning. The drum head 2 can be stretched with a desired tension.

[0013]

As described above, according to the drum tightening frame of the present invention, it is not necessary to remove the tightening bolt from the lug, so that the mounting and replacement of the drum head can be carried out quickly, and the drum can be fastened. Handleability can be improved. In addition, since the bolt head has sufficient strength, the bolt mounting portion is not damaged even when high tension tuning is performed, and the drum head can be securely extended.

[Brief description of the drawings]

FIG. 1 is a plan view of a drum tightening frame according to the present invention.

FIG. 2 is a view showing a mounting hole for a bolt.

FIG. 3 is an external perspective view showing a conventional snare drum upside down.

FIG. 4 is a cross-sectional view showing a part of a main part of the drum in a cutaway manner.

FIG. 5 is a plan view of a main part of another conventional fastening frame.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... drum main body, 2 ... drum head, 3 ... head support tension means, 5 ... head frame, 6 ... fastening frame, 7 ... lug, 8 ... fastening bolt, 8A ... bolt body, 8B ... head, 20 ... fastening frame ,
20A: cylindrical portion, 20B: disk portion, 21: bolt mounting portion, 21A: projecting portion, 22: mounting hole for bolt, 22A:
Long hole, 22B ... hole.

Claims (1)

[Claims] 1. A drum tightening frame which is fitted in an opening of a trunk body having a plurality of lugs on its outer periphery and is connected to each of the lugs by tightening bolts to press a head frame, wherein: The bolt mounting hole provided in the disk portion is formed by inserting a bolt body of the tightening bolt into a long hole extending in the circumferential direction of the tightening frame, and the tightening bolt connected to one end of the long hole. And a hole having a size that allows the head to be inserted.