JP3707485B2 - Drum lug mounting structure - Google Patents

Description

  The present invention relates to a drum lug mounting structure used for bass drums, snare drums, marting drums and the like.

In drums such as a bass drum, a snare drum, and a marting drum, the drum head is supported and tensioned by a plurality of head support tensioning means, and a predetermined tension is applied to the drum head (for example, see Patent Document 1).
Japanese Patent Application No. 2001-176367

  FIG. 13 is an external perspective view showing a conventional snare drum upside down, FIG. 14 is a cross-sectional view showing a lug mounting structure of the drum, and reference numeral 1 denotes a drum cylinder body composed of a cylindrical body with open ends, 2 Is a drum head, 2a is a front surface side drum head, 2b is a back surface side drum head, and 3 is a head support tension means of the drum head 2.

  The head support tension means 3 is configured to detachably connect a fastening frame (rim) 6 to the drum body 1 by a connection means, and to variably set the tension of the drum head 2. And an annular head frame 5 fitted to the outer periphery of the opening end of the drum body 1, the fastening frame 6 fitted to the outer periphery of the opening end of the drum body 1, and the drum body 1. A plurality of fasteners (hereinafter referred to as lugs) 8 fixed to the outer periphery of the drum by a plurality of bolts 7 and nuts, a plurality of fastening bolts 9 for connecting the fastening frame 6 to the drum body 1 and the like It consists of The fastening bolt 9 is inserted into the bolt mounting hole 11 of the fastening frame 6 via a washer 12 and is screwed to a lug nut 13 provided on the lug 8 side. The lug nut 13 is incorporated in the lug 8 and pressed against the inner surface of the lug 8 by being urged in the direction of the tightening bolt 9 by the compression coil spring 14 in order to prevent looseness.

  In such a structure, when the fastening bolt 9 is tightened with a tuning key (not shown) and the fastening frame 6 is pressed against the head frame 5, the head frame 5 moves to the lug 8 side, so that the drum head 2 expands in the radial direction. The tension increases and the tone and pitch of the drum are adjusted. Reference numeral 15 denotes a snappy (sound ray) provided on the back-side drum head 2b.

In the conventional snare drum 16 described above, the lug 8 is fixed to the outer periphery of the drum body 1 with the bolts 7 and the lug nut 13 is housed so as not to come out into the lug 8. When replacing the head, it was necessary to loosen the fastening bolt 9 and remove it from the lug nut 13 and to remove the fastening frame 6 and the head frame 5 from the drum body 1. Therefore, there is a problem that the work of removing the fastening bolt 9 from the lug nut 13 is troublesome and takes time.
When a new drum head 2 is mounted, the head frame 5 and the fastening frame 6 are fitted into the drum body 1, and then the fastening bolt 9 is screwed into the lug nut 13 so that the fastening frame 6 is attached to the head frame 5. The operation of screwing the tightening bolt 9 into the lug nut 13 is complicated.

  Therefore, in order to solve such a problem, for example, a lug nut locking structure as shown in FIG. 15 has been proposed. In this lug nut locking structure, the clamp member 21 having the main body 21A, the claw portion 21B and the groove 21C is screwed and fixed to the outer periphery of the drum cylinder main body 1 instead of the lug 8 described above, and the lug nut 13 is formed in a rod shape to form a longitudinal shape. A screw hole 22 penetrating in the radial direction is formed at the center in the direction, and a tightening bolt 9 is screwed into the screw hole 22, the lug nut 13 is engaged with the claw portion 21B of the clamp member 20, and the tightening bolt 9 is inserted into the groove. Inserted into 21C.

  In such a structure, when the fastening bolt 9 is rotated in the loosening direction and the lug nut 13 is moved within a range that does not come off the distal end side of the fastening bolt 9, the lug nut 13 can be detached from the claw portion 21B. The drum head can be replaced without removing the fastening bolt 9 from the lug nut 13.

However, the lug nut mounting structure shown in FIG. 15 has a large area in contact with the drum body 1 of the clamp member 21 similarly to the lug 8 shown in FIGS. 13 and 14, and prevents vibration of the drum body 1 itself. There was a problem.
Moreover, even if the lug nut 13 is detached from the claw portion 21B by rotating in the direction of arrow A in FIG. When the rotation is restored, the lug nut 13 may enter under the claw portion 21B and be caught again. For this reason, when replacing the drum head 2, it is necessary to remove the fastening frame from the drum body while holding the fastening bolt 9 loosened and removed from the clamping member 21 so as not to return to the original position by hand. It is difficult to manually hold all the fastening bolts 9 provided at equal intervals on the outer periphery of the drum body 1. Therefore, as with the lug mounting structure shown in FIGS. 13 and 14, the replacement work of the drum head 2 is troublesome and there is still room for improvement.

The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a drum lug mounting structure capable of quickly performing a drum head replacement operation. is there.
Another object of the present invention is to provide a drum lug mounting structure in which the lug does not hinder the vibration of the drum body.

According to a first aspect of the present invention, there is provided a drum in which a drum head is stretched at an opening end portion of a drum cylinder body by a head support tensioning means, which is formed in a pin shape and has an engagement portion at a tip portion thereof. A lug fixing member that is attached through the surface and a lug that holds one end of the fastening bolt, and the lug is provided with an engaging portion corresponding to the engaging portion of the lug fixing member, at least this sandwich engagement portion and the position where the clamping bolt penetrates the wall secured to the opposite position, that the lug by the engagement of each other the engaging portions mounted detachably against the lug fixing member It is.

According to a second invention, in the first invention, the engaging portion of the lug is a mountain-shaped protrusion, and a V-shaped engaging groove that engages with the protrusion is formed on the outer peripheral surface of the front end portion of the lug fixing member. Is formed .

  In a third aspect of the present invention, the nut according to the first or second aspect is integrally provided with a nut into which the fastening bolt is screwed.

According to a fourth aspect of the present invention, in the first or second aspect of the invention, the lug is provided with a detent plate that prevents the lug nut from rotating.

In the first invention, the lug can be fixed to the outer periphery of the drum body main body by engaging the engaging portion or the engaging member with the lug fixing member. When the engagement is released, the lug is removed from the drum body main body. Since it can be made to detach | leave, it is not necessary to remove a fastening bolt from a lug at the time of replacement | exchange of a drum head, and the replacement | exchange operation | work of a drum head can be performed easily and rapidly.
If the lug fixing member and the engaging portion are disengaged and the lug is removed from the drum body, and the lug is turned upside down, the tightening bolt returns to its original position and the lug Even if it hits the lug fixing member, the lug fixing member and the engaging part will not re-engage because there is a wall surface, so hold the tightening bolt by hand so that it does not return to its original position. Therefore, the drum head can be replaced more easily.
Moreover, since the lug fixing member is formed in a pin shape, it can be made sufficiently smaller than the lug.

In the second aspect of the invention, the lug is fixed to the outer periphery of the drum body main body by the engagement of the mountain-shaped protrusion provided on the lug on the lug fixing member and the V-shaped engagement groove provided on the lug fixing member. Can do.

In 3rd invention, since the nut which consists of another parts is not required, the number of parts can be reduced. Also, it will not fall off and be lost .

In the fourth invention, the rotation stop plate prevents the lug nut from rotating.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is a cross-sectional view showing a first embodiment of a drum lug mounting structure according to the present invention, FIG. 2 is a perspective view of the lug mounting structure, and FIG. 3 is a cross-sectional view showing a state when a tightening bolt is loosened. 4 is a sectional view showing a state in which the lug is removed from the drum body, and FIG. 5 is a sectional view showing a state in which the lug is turned upside down. The same components as those shown in the prior art are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In the lug mounting structure according to the present invention, the lug 8 is attached to the outer periphery of the drum body main body 1 by the engagement between the lug fixing member 30 protruding from the outer periphery of the drum body 1 and the engaging portion 31 provided on the lug 8 side. It is configured to be detachably fixed.

  The lug fixing member 30 includes a main body 30A formed in a pin shape having a circular cross section, and two flange portions 30B and 30C integrally projecting from the outer peripheral surface of the front end portion of the main body 30A at a predetermined interval. The screw hole 32 is formed in the base end surface of the main body 30A. The two flange portions 32A and 32B restrict the movement of the lug 8 in the front-rear direction, and have a gap slightly larger than the thickness of the back plate 8D of the lug 8. Further, the flange portion 30B in contact with the outer peripheral surface of the drum body main body 1 has a slightly larger outer diameter than the flange portion 30C located on the front end side, and the interval setting portion for separating the lug 8 from the outer peripheral surface of the drum body main body 1 It also has the function as On the other hand, the flange portion 30 </ b> C on the distal end side forms a drop prevention portion that prevents the lug fixing member 30 from coming off from the engagement portion 31.

  Such a lug fixing member 30 is inserted into the mounting hole 33 formed in the peripheral surface of the drum body 1 from the outside of the drum body 1, and the interval setting portion 30 </ b> B is brought into close contact with the outer surface of the drum body 1. The bolt 7 is fixed to the drum body 1 by being screwed into the screw holes 32 from the inside of the drum body 1.

  The lug 8 is formed into a hollow body with a top plate 8A, an inclined bottom plate 8B, a semi-cylindrical (or U-shaped) front and side plate 8C, and the back plate 8D, and a fastening bolt 9 is screwed therein. A lug nut 13 and a compression coil spring 14 that biases the lug nut 13 upward are housed. The lug nut 13 is stored in a rotationally stopped state, and the tip end portion projects outward from a nut hole 34 formed in the upper surface plate 8A. The back plate 8D is curved in an arc shape with substantially the same curvature as the outer peripheral surface of the drum body 1, and the engaging portion 31 is formed at the center. The top plate 8A, the bottom plate 8B, and the front / side plate 8C are integrally formed, and the back plate 8D is joined thereto by welding or the like. Further, the front and side plate 8 </ b> C forms a wall surface provided in a position opposite to the wall surface in claim 1, i.e., a position where the engagement portion 31 of the lug 8 and the fastening bolt 9 pass through.

  The engaging portion 31 is formed in a keyhole shape, and thus includes a large-diameter hole portion 31A and a long hole portion 31B whose upper end communicates with the lower end of the large-diameter hole portion 31A. The large-diameter hole portion 31A has a hole diameter slightly larger than the outer diameter of the flange portion 30C and smaller than the outer diameter of the inner flange portion 30B in order to allow insertion of the flange portion 30C on the distal end side of the lug fixing member 30. Have. The long hole portion 31B has a groove width narrower than that of the large diameter hole portion 31A and slightly larger than the outer diameter of the main body 30A of the lug fixing member 30, and below the large diameter hole portion 31A. It is extended.

  When attaching the lug 8 to the drum body 1, the flange portion 30C is inserted into the large-diameter hole portion 31A, and the portion 30a between the flange portions 30B and 30C of the main body 30A is inserted into the elongated hole portion 31B. . Further, the head frame 5 and the fastening frame 6 are fitted on the outer periphery of the opening end of the drum body 1. Then, when the fastening bolt 9 is inserted into the bolt mounting hole 11 of the fastening frame 6 via the washer 12, the tip is screwed into the lug nut 13 and tightened with the tuning key, the fastening frame 6 and the lug 8 approach each other. Therefore, the fastening frame 6 presses the head frame 5 to increase the tension of the drum head 2, and the end wall 36 of the long hole portion 31B is pressed against the main body portion 30a. Is attached to the drum body 1. Since the lug 8 is attached to the drum body 1, a gap setting portion 30 </ b> B provided on the lug fixing member 30 is interposed between the drum body 1 and the back plate 8 </ b> D. There is no contact.

  When the drum head 2 is replaced with another drum head, the tightening bolt 9 is loosened within the range where it cannot be removed from the lug nut 13 with the tuning key, and the lug 8 and lug nut 13 are moved downward along the tightening bolt 9 as shown in FIG. The large diameter hole portion 31A of the engaging portion 31 and the flange portions 30B, 30C are made to coincide with each other. Next, as shown in FIG. 4, the fastening bolt 9 is rotated in a direction in which the lug 8 is separated from the drum body 1, and the lug fixing member 30 is extracted from the engaging portion 31. Then, as shown in FIG. 5, the lug 8 is rotated 180 ° and turned upside down. The reason why the lug 8 is turned upside down is that when the fastening bolt 9 is returned to its original position, the flanges 30B and 30C of the lug fixing member 30 are re-engaged into the large-diameter hole 31A of the engaging portion 31. This is to prevent this.

  In the attachment structure of the lug 8 having such a structure, the lug 8 is detachably attached to the drum body 1 by the engagement of the lug fixing member 30 and the engaging portion 31, and the fastening bolt 9 is fixed by a certain amount. By rotating in the loosening direction so that the flanges 30B, 30C of the lug fixing member 30 and the large-diameter hole portion 31A of the engaging portion 31 are aligned, the lug 8 is rotated in a direction away from the drum body main body 1, Since the engagement between the lug fixing member 30 and the engaging portion 31 is released, it is not necessary to completely remove the tightening bolt 9 from the lug nut 13 when replacing the drum head 2, and the drum head 2 can be replaced. Easy.

  The lug fixing member 30 is pin-shaped and sufficiently smaller than the lug 8, and the interval setting portion 30 </ b> B provided on the lug fixing member 30 is interposed between the drum body 1 and the lug 8. Therefore, the lug 8 does not come into direct contact with the drum body 1 and hinders vibration of the drum body 1 as compared with the conventional lug mounting structure and lug nut locking structure shown in FIGS. The volume can be increased less.

  Further, after releasing the engagement between the lug fixing member 30 and the engaging portion 31 and removing the lug 8 from the drum body 1, if the lug 8 is turned upside down, the fastening bolt 9 is rotated to the original position. Even if the lug hits the lug fixing member 30 after moving back, the lug fixing member 30 and the engaging portion 31 do not re-engage, so the fastening bolt 9 does not return to the original position. Thus, it is not necessary to hold it down by hand, and the drum head can be replaced more easily.

FIG. 6 is a perspective view of a lug showing a second embodiment of the present invention.
In this embodiment, the lug 40 is formed by bending a metal plate. The lug 40 is formed into a rectangular box shape in which the left and right side surfaces and the upper back surface are open by the upper surface plate 40A, the bottom surface plate 40B, the front surface plate 40C, and the rear surface plate 40D. A through hole for nut 41 is provided, a space 42 is provided between the top plate 40A and the back plate 40D, and a U-shaped groove (engagement portion) 43 is formed on the upper edge of the back plate 40D. 40 C of front plates form the wall surface of Claim 1, ie, the wall surface which opposes the U-shaped groove | channel 43 on both sides of the fastening bolt 9. As shown in FIG.

  Since the lug nut 13 is fixed to the lower surface side of the upper surface plate 40A by welding or the like, the compression coil spring 14 shown in FIG. 1 is not required. The space 42 and the U-shaped groove 43 correspond to the large-diameter hole portion 31 </ b> A and the long hole portion 31 </ b> B shown in FIG. 1, and the space 42 and the U-shaped groove 43 can be engaged with the lug fixing member 30. An engaging portion 44 is formed. The lug fixing member 30 has the same structure as that of the above-described embodiment.

  Since the lug 40 having such a structure is formed by bending a metal plate, the lug 40 can be easily manufactured and the manufacturing cost can be reduced.

7A and 7B are a cross-sectional view and a perspective view of a rotation stopper plate showing a third embodiment of the present invention.
In this embodiment, a locking plate 45 is used instead of the compression coil spring 14 shown in FIG. 1 to prevent the tightening bolt 9 from loosening. The anti-rotation plate 45 is formed of plastic or the like, has a screw hole 46 into which the fastening bolt 9 is screwed in the center of the distal end portion, and the bent piece 45A is bent substantially vertically toward the base end side, The bent piece 45 </ b> A is fixed to a mounting portion 47 provided at the upper back of the lug 8 with a screw 48. A partition plate 49 on which the detent plate 45 is placed is integrally provided above the lug 8. Other structures are substantially the same as those in the first embodiment. In such a structure, the compression coil spring 14 is unnecessary.

FIG. 8 is a cross-sectional view of a lug fixing member and an engaging member showing a fourth embodiment of the present invention.
In this embodiment, a lug fixing member 50 protrudes from the outer periphery of the drum body 1, and an insertion hole 51 is formed at the distal end surface of the lug fixing member 50, and an inner peripheral surface of the insertion hole 51 is formed. An annular engagement groove 52 is formed. On the other hand, an engaging member 54 is attached to an end 53 of the lug 8 opposite to the fastening bolt side in correspondence with the lug fixing member 50.

  The engaging member 54 has a pin-like main body 56 whose front end portion 56 a is inserted into the insertion hole 51 of the lug fixing member 50, and the base end side of the main body 56 is connected to the end portion 53 of the lug 8. A fixed portion 56b to be fixed is formed. The front end portion 56 a of the main body 56 has an outer diameter slightly smaller than the hole diameter of the insertion hole 51, and two balls 57 are incorporated in the outer periphery in the vicinity of the front end so as to be able to protrude and retract corresponding to the engagement groove 52. ing. For this reason, a through hole 58 in a direction perpendicular to the axis is formed at the tip 56 a of the main body 56, and the ball 57 is incorporated in the through hole 58. Both end openings of the through hole 58 are set slightly smaller than the outer diameter of the ball 57 to prevent the ball 57 from coming off.

  An engagement / disengagement pin 60 for engaging / disengaging the ball 57 with respect to the engagement groove 52 is incorporated in the main body 56. The engagement / disengagement pin 60 is slidably inserted into the through hole 61 formed in the main body 56 from the fixed portion 56 b side and is slidably inserted, and is urged by the compression coil spring 62 to the fixed portion 56 b side. A small hemispherical recess 63 is formed on the outer peripheral surface of the engagement / disengagement pin 60 corresponding to each of the balls 57.

  In such a structure, when the engagement member 54 is connected to the lug fixing member 50, the push-in ball 57 and the recess 63 are made to coincide with each other while the engagement / disengagement pin 60 is opposed to the compression coil spring 62. In this state, the distal end portion 56 a of the main body 56 is inserted into the insertion hole 51, and the ball 57 is aligned with the engagement groove 52. Next, when the pressing force of the engagement / disengagement pin 60 is released, the engagement / disengagement pin 60 is retracted by the force of the compression coil spring 62 to retract the ball 57 from the recess 63 and engage with the engagement groove 52. As a result, the engaging member 54 is locked to the lug fixing member 50.

  When the engaging member 54 is extracted from the lug fixing member 50, the engaging / disengaging pin 60 is pushed against the compression coil spring 62 so that the recess 63 is aligned with the ball 57, and the engaging member 54 is extracted in this state. .

FIG. 9 is a cross-sectional view showing a fifth embodiment of the present invention, and FIGS. 10A to 10E are a front view, a rear view, a cross-sectional view taken along line AA, a cross-sectional view taken along line BB, and C -C sectional view, FIGS. 11A to 11C are a plan view, a front view, and a bottom view of the rotation stopper plate.
In this embodiment, the lug 70 is locked to the lug fixing member 50 protruding from the outer periphery of the drum body 1, and the rotation of the lug nut 13 is prevented by the rotation stop plate 75. The lug fixing member 50 is attached so as to penetrate the drum body 1, and a V-shaped engagement groove 71 is formed on the outer peripheral surface of the tip portion. The lug 70 is integrally provided with a partition plate 49 that receives and supports the anti-rotation plate 75 at an upper portion inside. The partition plate 49 has a U-shaped groove 73 into which a fastening bolt is inserted at the center in the width direction. On the other hand, an opening 74 is provided below the lug 70 so that the front end of the lug fixing member 50 is inserted from the rear. The opening 74 is integrally provided with a mountain-shaped engaging protrusion 79 that engages with the engaging groove 71 of the lug fixing member 50 from below.

  The rotation stop plate 75 has a long hole 76 and an elastic engagement piece 77, and the lower end portion of the lug nut 13 is inserted into the long hole 76 to prevent the rotation of the lug nut 13. In this case, the rotation of the lug nut 13 is prevented by elastically deforming (compressing) the portion where the long hole 76 of the rotation stop plate 75 is formed by the inner shape of the lug 70 and pressing the left and right side walls of the long hole 76 against the lug nut 13. To do. The elastic engagement piece 77 is a reverse L-shaped elastic piece that is bent upward at the end of the rotation stop plate 75 opposite to the long hole 76 side. Is inserted into the space between the upper surface plate 70A and the partition plate 49, it is pressed against the lower surface of the upper surface plate 70A from below, thereby preventing the detent plate 75 from coming off the lug 70 and falling off. ing. In FIG. 9, reference numeral 78 denotes an O-ring fitted to the lug nut 13.

  Even with such a structure, it is obvious that the same effect as that of the embodiment shown in FIG. 7 can be obtained.

12 (a) to 12 (f) are a front view, a plan view, a side view, a rear view, a DD line sectional view and a FF line sectional view of a lug showing a sixth embodiment of the present invention. .
In this embodiment, the upper surface plate 80A of the lug 80 is formed thick, a screw hole into which a fastening bolt is screwed is formed at the center, and the portion where the screw hole is formed is a lug nut 82. That is, in this embodiment, the lug 80 and the lug nut 82 are integrally formed. Further, a pair of left and right rotation-preventing claws 83 are integrally provided below the lug nut 82 inside the lug 80, and these claws 83 are engaged with male threads of the tightening bolt to prevent loosening of the tightening bolt. It was. The other structure of the lug 80 is substantially the same as that of the lug 70 shown in FIG. 9, and a mountain-shaped engaging protrusion 79 that engages with the engaging groove 71 of the lug fixing member 50 from below is integrally formed. Projected.

  In such a structure, since the nut 82 and the claw 83 for preventing rotation are integrally provided on the lug 80, a lug nut and a rotation stopper plate made of different members are not required, and the number of parts can be reduced.

  The present invention is not limited to the above-described embodiment, and various changes and modifications can be made. For example, the engagement portion 31 made of a keyhole-shaped hole shown in FIG. It is also possible to make a part.

It is sectional drawing which shows 1st Embodiment of the lug attachment structure of the drum which concerns on this invention. It is a perspective view of the lug attachment structure. It is sectional drawing which shows a state when a fastening bolt is loosened. It is sectional drawing which shows the state which removed the lug from the drum trunk | drum main body. It is sectional drawing which shows the state which turned the lug upside down. It is a perspective view of the lug which shows the 2nd Embodiment of this invention. (A), (b) is sectional drawing which shows the 3rd Embodiment of this invention, and a perspective view of a rotation stop plate. It is sectional drawing of the member for lug fixation which shows the 4th Embodiment of this invention, and an engaging member. It is sectional drawing which shows the 5th Embodiment of this invention. (A)-(e) is the front view of a lug, a rear view, AA sectional view, BB sectional drawing, and CC sectional drawing. (A)-(c) is the top view of a rotation prevention board, a front view, and a bottom view. (A)-(f) is the front view of the lug which shows the 6th Embodiment of this invention, a top view, a side view, a rear view, DD line sectional drawing, and FF line sectional drawing. It is an external appearance perspective view which shows the conventional snare drum upside down. It is sectional drawing which shows the attachment structure of the conventional lug. It is a perspective view which shows the latching structure of the conventional lug nut.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Drum cylinder body, 2, 2a, 2b ... Drum head, 3 ... Head support tension means, 5 ... Head frame, 6 ... Fastening frame, 8 ... Lug, 9 ... Fastening bolt, 30 ... Lug fixing member, 30A ... Main body, 30B ... spacing setting part, 31 ... engaging part, 31A ... large diameter hole part, 31B ... long hole part, 40 ... lug, 42 ... space, 43 ... U-shaped groove, 44 ... engaging part, 50 ... Lug fixing member, 51 ... insertion hole, 52 ... engagement groove, 54 ... engagement member, 56 ... main body, 57 ... ball, 60 ... engagement / removal pin, 70,80 lug, 75 ... rotation stop plate, 82 ... nut .

Claims (4)

In the drum in which the drum head is stretched by the head support tension means at the opening end of the drum body,
A lug fixing member that is formed in a pin shape and has an engaging portion at the tip, and is attached to penetrate the peripheral surface of the drum body main body;
A lug for holding one end of the fastening bolt,
Provided with an engaging portion corresponding to the engaging portion of the lug fixing member in the lug is provided with a wall surface at a position facing each other across a position at least as the engaging portion and the tightening bolt passes, the engagement lug mounting structure of the drum, characterized in that mounted detachably against the lug on the lug fixing member by the engagement of the engagement portion with each other. In the drum lug mounting structure according to claim 1,
The lug mounting of a drum, wherein the engaging portion of the lug is a chevron-shaped protrusion, and a V-shaped engaging groove that engages with the protrusion is formed on the outer peripheral surface of the tip of the lug fixing member. Construction. In the drum lug mounting structure according to claim 1 or 2,
A drum lug mounting structure , wherein a nut for screwing the fastening bolt onto the lug is provided integrally . In the drum lug mounting structure according to claim 1 or 2 ,
A drum lug mounting structure, wherein the lug is provided with a detent plate for preventing the lug nut from rotating .

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