JP2002366140A - Clamping frame attaching structure of drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide clamping frame attaching structure of a drum with which a washer does not fall off from a clamping bolt or a clamping frame even when the clamping bolt is detached from the clamping frame. SOLUTION: The clamping frame 6 is formed of a magnetic material such as iron or a nonmagnetic material such as aluminum. The clamping bolt 8 is formed of the magnetic material such as iron and then is magnetized to a permanent magnet. The washer 12 is formed of the magnetic material such as iron and is sucked to the clamping bolt 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum fastening frame mounting structure 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 a perspective view showing the appearance of a conventional snare drum inverted upside down, and FIG. 4 is a cross-sectional view showing a fastening frame mounting structure of the drum. Main body 2, drum head 2 (2a, 2b), 3
Is a head support tensioning means for the drum head 2.

[0004] The head supporting and tensioning means 3 normally holds the outer peripheral edge of the drum head 2 and is fitted around the outer periphery of the trunk body 1, and is also fitted around the outer periphery of the trunk body 1. An annular tightening frame (rim) 6, a plurality of lugs 7 fixed to the outer periphery of the body 1, tightening bolts 8 provided on each lug 7, and the like. The tension of the drum head 2, that is, 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. The tightening bolt 8 is inserted through a bolt mounting hole 11 of the tightening frame 6 through a washer 12 and screwed to a lug 13 of the lug 7 to connect the tightening frame 6 to the lug 7. 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,
Reference numeral 14 denotes a compression coil spring.

[0005]

When the drum head 2 is replaced in the conventional snare drum 10 described above,
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 trunk 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 1
1 is screwed into the lug 13 through the washer 12 through the washer 12, and the tightening frame 6 needs to be pressed against the head frame 5.
However, the tightening frame 6 with such tightening bolts 8 is used.
When the drum head 2 is mounted or replaced, the tightening bolt 8 is removed from the lug 13 and the tightening frame 6 is mounted.
Washer 1 when pulled out from the bolt mounting hole 11
If the bolt 2 comes off from the bolt 8 and falls off, it may roll on the floor and enter a narrow gap and be lost. there were.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to prevent a washer from dropping off from a tightening bolt or a tightening frame even when the tightening bolt is removed from the tightening frame. Accordingly, an object of the present invention is to provide a drum fastening frame mounting structure in which a washer is prevented from being lost.

[0007]

According to a first aspect of the present invention, a fastening frame is fitted into an opening of a trunk body having a plurality of lugs on an outer periphery, and a bolt is attached to the fastening frame. In a drum tightening frame mounting structure for pressing the tightening frame against a head frame by inserting a tightening bolt into a hole via a washer and screwing the lug into a lug nut of the lug, the washer and the tightening frame or the tightening bolt Are magnetically attracted. In the present invention, since the washer and the tightening frame or the tightening bolt are magnetically attracted, the washer does not fall off even if the tightening bolt is removed from the tightening frame.

[0008] The second invention is the first invention, wherein
The washer is made of a magnetized magnetic material, and one of the tightening frame and the tightening bolt is formed of a magnetic material. In the present invention, the washer forms a permanent magnet, and magnetically attracts a tightening frame or a tightening bolt made of a magnetic material. Therefore, even if the fastening bolt is removed from the fastening frame, the washer does not fall off the fastening frame or the fastening bolt.

[0009] In a third aspect based on the first aspect,
The washer is made of a magnetic material, and one of the tightening frame and the tightening bolt is formed of a magnetized magnetic material.
In the present invention, the tightening frame or the tightening bolt forms a permanent magnet, and magnetically attracts a washer made of a magnetic material. Therefore, even if the fastening bolt is removed from the fastening frame, the washer does not fall off the fastening frame or the fastening bolt.

In a fourth aspect based on the first aspect,
The washer is made of a magnetized magnetic material, and one of the tightening frame and the tightening bolt is made of a magnetized magnetic material, and the other is made of a non-magnetic material. In the present invention, since the washer and the tightening frame or the tightening bolt constitute a permanent magnet, they are magnetically attracted to each other. Therefore, even if the fastening bolt is removed from the fastening frame, the washer does not fall off the fastening frame or the fastening bolt.

[0011]

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 cross-sectional view showing an embodiment of a fastening frame mounting structure for a drum according to the present invention. Note that the same components as those shown in the prior art are denoted by the same reference numerals. The tightening frame mounting structure according to the present invention has a washer 12 to prevent the washer 12 from falling off from the tightening frame 6 or the tightening bolt 8 when the tightening bolt 8 is pulled out from the bolt mounting hole 11.
And the tightening frame 6 or the tightening bolt 8 are magnetically attracted. For this reason, the head supporting and tensioning mechanism 3 of the drum 10 is the same as the above-described conventional structure, and includes a head frame 5, a tightening frame 6, a lug 7, a tightening bolt 8, a washer 12, a lug nut 13, and the like. 6 through a washer 12 through a bolt mounting hole 11 provided in
A predetermined tension is applied to the drum head 2 by pressing the tightening frame 6 against the head frame 5.

As a configuration in which the washer 12 and the tightening frame 6 or the tightening bolt 8 are magnetically attracted, the washer 12 is formed of a magnetic material, and either the tightening frame 6 or the tightening bolt 8 is made of a magnetic material. After being formed, it is magnetized to be a permanent magnet (magnetized magnetic material), and the other is made of a magnetic material or a non-magnetic material, or the washer 12 is made of a magnetic material and then magnetized to be a permanent magnet. And the fastening bolt 8 may be formed of a magnetic material and the other may be formed of a non-magnetic material. Further, the washer 12 is formed of a magnetic material and then magnetized to form a permanent magnet.
One of them may be formed of a magnetic material and then magnetized to form a permanent magnet, and the other may be formed of a non-magnetic material. As a magnetic material, a ferromagnetic material having a large relative permeability,
For example, iron, nickel, cobalt, manganese, or an alloy thereof may be used. Aluminum, stainless steel, or the like may be used as the non-magnetic material.

The tightening frame 6, the tightening bolt 8, and the washer 1
Table 1 below shows the patterns of the two materials.

[Table 1]

When the fastening frame 6 and the washer 12 are magnetized, a magnetic field is applied to magnetize them in the thickness direction, and the front and back surfaces are magnetized to the N pole and the S pole (or vice versa). When the fastening bolt 8 is magnetized, a magnetic field is also applied to magnetize the fastening bolt 8 in the axial direction, and the head and the tip of the male screw portion may be magnetized to the N pole and the S pole (or vice versa).

Here, in the embodiment shown in FIG. 1, an example is shown in which pattern 1 shown in Table 1 is adopted. That is, the tightening frame 6 is formed of a magnetic material such as iron or a non-magnetic material such as aluminum, the tightening bolt 8 is formed of a magnetic material such as iron, and then magnetized to form a permanent magnet, and the washer 12 is formed of a magnetic material such as iron. An example formed by a material is shown.

FIG. 2 shows an example employing the pattern 3 shown in Table 1. That is, an example in which the tightening frame 6 is formed of a magnetic material such as iron, the tightening bolt 8 is formed of a non-magnetic material such as stainless steel, the washer 12 is formed of a magnetic material such as iron, and then magnetized to form a permanent magnet. Is shown.

In the fastening frame mounting structure having such a structure, when the fastening bolt 8 is removed, the washer 1 is removed.
2 can be prevented from falling off. That is, in the embodiment shown in FIG. 1, the fastening bolt 8 forms a permanent magnet, and the washer 12 is attracted and held by the magnetic force. Since the washer 12 is also lifted up when it is pulled out of the bolt 11, the washer 12 does not fall off from the tightening bolt 8. In the patterns 2 and 5, as in the case of the pattern 1, the washer 12 and the tightening bolt 8 are magnetically attracted, so that they do not fall off from the tightening bolt 8.

In the embodiment shown in FIG. 2, the washer 12 forms a permanent magnet, and the magnetic force of the washer 12 causes the tightening frame 6 to rotate.
When the tightening bolt 8 is removed from the lug nut 13 and lifted up and pulled out from the bolt mounting hole 11, the washer 12 maintains the state of being magnetically attracted to the surface of the tightening frame 6, No loss from 6. Patterns 4 and 6 also have washers 12 similarly to pattern 3.
And the tightening frame 6 is magnetically attracted, so that it does not fall off the tightening frame 6.

When the pattern 6 is adopted, it should be noted that since the fastening frame 6 and the washer 12 together constitute a permanent magnet, the magnetic pole on the front side of the fastening frame 6 and the magnetic pole on the lower side of the washer 12 have different polarities. It is desirable to assemble so that

[0020]

As described above, according to the drum tightening frame mounting structure of the present invention, when the tightening bolt is removed from the lug and pulled out from the bolt mounting hole of the tightening frame, the washer is tightened by the tightening bolt or the tightening frame. The attachment and replacement of the drum head can be performed quickly without dropping from and losing the drum head.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a drum fastening frame mounting structure according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the present invention.

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

FIG. 4 is a sectional view of a fastening frame mounting structure of the drum.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... drum main body, 2 ... drum head, 3 ... head support tension means, 5 ... head frame, 6 ... tightening frame, 7 ... lug, 8 ... tightening bolt, 8A ... bolt main body, 8B ... head, 11 ... for bolt Mounting holes, 12: washers, 13: lug nuts.

Claims (4)

[Claims] 1. A tightening frame is fitted into an opening of a trunk body having a plurality of lugs on the outer periphery, and a tightening bolt is inserted through a bolt mounting hole of the tightening frame through a washer to a lug nut of the lug. A drum fastening frame mounting structure for pressing the fastening frame against a head frame by screwing, wherein the washer and the fastening frame or the fastening bolt are magnetically attracted. Tightening frame mounting structure. 2. The drum tightening frame mounting structure according to claim 1, wherein the washer is made of a magnetized magnetic material, and one of the tightening frame and the tightening bolt is made of a magnetic material. Frame mounting structure. 3. The drum tightening frame mounting structure according to claim 1, wherein the washer is made of a magnetic material, and one of the tightening frame and the tightening bolt is made of a magnetized magnetic material. Frame mounting structure. 4. The fastening frame mounting structure for a drum according to claim 1, wherein the washer is made of a magnetized magnetic material, one of the fastening frame and the fastening bolt is made of a magnetized magnetic material, and the other is non-magnetic. A drum fastening frame mounting structure comprising a material.