JPS6339754Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a beater amplitude adjusting device for a drum pedal.

[Technical background of the invention]

A drum pedal used to play a bass drum consists of a footboard, a beater that is rotated by pressing down on the footboard to strike the drum head, and a beater return spring that rotates the beater to return to its original position.

Figures 5 and 6 show a conventional drum pedal. In the figure, 1 is a base placed on the floor, and a pair of pillars 2, 2 are erected on both sides of the base 1. . A bearing bearing 3 is provided at the upper end of the pillars 2,2.

Reference numeral 4 denotes a rotation shaft provided horizontally with both ends supported by bearings 3 at the upper ends of the pair of pillars 2, 2;
A beater support member is fixed to the intermediate portion of the rotating shaft 4, and the beater support member 5 is composed of a circular belt-wrapping drum 5a and a beater mounting portion 5b provided on the side surface thereof.

6 is a beater attached to the beater support member 5. This beater 6 consists of a beater rod 6a and a beater main body 6b made of felt.The base of the beater rod 6a is inserted into a beater rod insertion hole 7 provided in the beater mounting portion 5b, and is secured by a set screw 8. Fixed.

9 is a footboard base connected to the frame 1 via a connecting rod 10; 11 is a footboard whose base end is pivotally supported by the footboard base; one end of a non-stretchable belt 12 is attached to the tip of the footboard 11; is fixed by a set screw 13. The other end of the belt 12 is wound around the belt mounting drum 5a over approximately half its circumference, and its tip is secured to a set screw 14. The belt is fixedly attached to the belt-wrapped drum 5a.

This belt 12 suspends and supports the tip of the footboard 11, and also suspends and supports the tip of the footboard 11.
The beater support member 5 is rotated by being pulled downward when the beater 6 is depressed.
When the footboard 11 is depressed, the beater support member 5 is rotated in the direction shown by the arrow in FIG. 1, thereby striking the drum head (not shown) of the bass drum.

Reference numeral 15 denotes a cam plate that is attached to the end of the rotating shaft 4 and rotates integrally with the rotating shaft 4. The cam plate 15 is fitted onto the rotating shaft 4 so that it does not rotate, and is secured to the set screw 16. Fixed by

Further, reference numeral 17 denotes a spring-loaded roller attached at a position eccentric from the tip of the cam plate 15, that is, the rotation center of the cam plate 15 (the axis of the rotation shaft 4);
Reference numeral 18 denotes a beater return spring, and the upper end of this spring 18 is hooked to a hanging ring 19, and is hooked to the spring-loaded roller 17 via this hanging ring 19.

Reference numeral 20 denotes a spring receiving plate fixed to the lower end side of the support column 2 by a set screw 21, and a spring retaining bolt 22 is inserted into the spring receiving plate 20 so as to be movable up and down. The lower end of the spring retaining bolt 2
It is hooked into a spring hook hole 23 provided at the upper end of 2.

A bolt nut 24 is screwed onto the lower end of the spring retaining bolt 22 , and this bolt nut 24 abuts against the lower surface of the spring receiving plate 20 to retain the spring retaining bolt 22 to the spring receiving plate 20 .

Note that the spring retaining bolt 22 is pulled upward by the tensile force of the beater return spring 18, so that the spring retaining bolt 22
is the bolt fixing nut 24 and the spring receiving plate 2.
It is locked without rattling just by contact with 0.

Further, the bolt locking nut 24 also serves as a spring force adjustment bolt for the beater return spring 18, and when the bolt locking nut 24 is turned in the tightening direction, the spring locking bolt 22 moves downward to return the beater. By stretching the spring 18, the spring force becomes stronger, and by turning the bolt locking nut 24 in the opposite direction, the spring force becomes weaker.

In the figure, 25 is a hoop clamp member that clamps the head holding hoop of the bass drum, and 26 is a clamp bolt that presses this hoop clamp member 24 against the head holding hoop.

This drum pedal performs drum performance by pressing down on the footboard 11.
1, the beater 6 rotates and hits the drum head, and in conjunction with this operation, the cam plate 15 rotates while stretching the beater return spring 18. Further, when the foot is removed from the footboard 11, the cam plate 15, which is pulled in one direction by the beater return spring 18, is rotated back by the tensile force of the beater return spring 18.
Along with this, the beater 6 returns to its original position.

By the way, when playing the bass drum using this foot pedal, the volume of the playing sound and the speed at which the drum head is struck are adjusted depending on the song title and the player's preference.

The loudness of the performance sound and the speed at which the drum head is struck are determined by the amplitude of the beater 6, that is, the distance from the return position of the beater 6 to the drum head surface, and the force with which the footboard 11 is pressed down. Since this is determined by the physical strength of the performer, the volume of the performance sound and the speed at which the drum is struck are adjusted by adjusting the amplitude of the beater 6.

In order to adjust the beater amplitude, conventionally, the cam plate 15, which is pulled in one direction by the beater return spring 18, is shaped as shown in FIG.
This crank arm 15 has a rotation shaft fitting hole 15a.
A plurality of spring-loaded roller mounting holes 27a, 27b, and 27c are provided along an arc line centered at .

This beater width adjustment device is designed to change the return position of the beater 6 by selectively attaching spring-loaded rollers 17 to the mounting holes 27a, 27b, and 27c of the cam plate 15. If the beater 17 is attached to the attachment hole 27a on the left side of the figure as shown in FIG. 8, the return position of the beater 6 will be the a position. Furthermore, if the spring-loaded roller 17 is attached to the center attachment hole 27b, the return position of the beater 6 will be position b, and the right attachment hole 27b will return to the beater 6 position.
If it is attached to position c, the beater return position will be position c.

[Problems with background technology]

However, in the conventional beater amplitude adjusting device, the mounting hole 27 provided in the cam plate 15
Even if the intervals between a, 27b, and 27c are made as small as possible, each mounting hole 27a, 2 is centered around the center of the rotation shaft fitting hole 15a, that is, the axis of the rotation shaft 4.
Since the angle θ ₀ between 7b and 27c is 15° to 20° or more, the beater 6 will also be displaced by an angle θ of 15° to 20° or more. Therefore, the beater amplitude should be roughly adjusted. There is also the problem that adjusting the beater width requires a lot of effort because the roller 17 must be replaced with the spring hook on the cam plate 15 each time the beater width is adjusted. It was hot.

[Purpose of invention]

This idea was created in view of the above-mentioned circumstances, and its purpose was to make it possible to easily adjust the beater amplitude in small increments, and to adjust the loudness of the playing sound and the drum. To provide a beater amplitude adjusting device for a drum foot pedal, which allows fine adjustment of the speed of beating.

[Summary of the idea]

That is, this invention includes a cam member that is pulled in one direction by a beater return spring and rotates the rotation shaft by the tensile force of the spring to return the beater, and has a fitting hole with the rotation shaft. and a cylindrical cylinder having a diameter larger than the rotating shaft, which is provided with a slotted portion opening from the fitting hole to the outer surface of the cam member on one end side, and the cam member is fitted and fixed to the end of the rotating shaft. It is rotatably fitted to the outside of the shaped cam receiver, and by rotating the cam member about the rotation shaft, the beater amplitude can be adjusted in small increments without changing the connection position of the beater return spring to the cam member. At the same time, the cam member is tightened so as to reduce the slotted portion using a lock screw that is inserted from the outside into one of the side plate portions that sandwich the slotted portion and is screwed into the other side plate portion. The cam member is fixed to the cam receiver by means of the cam member, so that the cam member is rotated integrally with the rotation shaft.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 4. Components corresponding to those shown in FIGS. 5 and 6 are designated by the same reference numerals in the drawings, and their explanations will be omitted.

In FIGS. 1 to 4, reference numeral 30 denotes a cam member that is attached to the end of the rotating shaft 4 and rotates integrally with the rotating shaft 4, and this cam member 30 is made of metal.

The cam member 30 is a vertically elongated member having a rotary shaft fitting hole in the center thereof that fits into the end of the rotary shaft 4, and a cam member is inserted from the rotary shaft fitting hole into the upper end side. A slotted portion 31 that is open to the outer surface of the upper end is provided.

On the other hand, a cylindrical cam receiver 4a having a larger diameter than the rotating shaft 4 is fitted into the end of the rotating shaft 4 and is fixed to the rotating shaft 4 with a set screw 4b. is rotatably fitted on the outside of this cylindrical cam receiver 4b.

Further, 32 is a lock screw provided on the upper end side of the cam member 30, and this lock screw 32
is inserted from the outside into a screw insertion hole 33 provided in one of the side plate parts 31a of the both side plate parts sandwiching the slotted part 31 of the cam member 30, and
It is screwed into a screw hole 34 provided in 1b.

This lock screw 32 is used to tighten and fix the cam member 30 to the cam receiver 4a of the rotating shaft 4. When this lock screw 32 is tightened, the slotted portion 31 shrinks and the cam member 30 is tightened to the cam receiver 4a. The cam member 30 is fixed and rotates integrally with the rotation shaft 4.

A spring-loaded roller 17 is attached to the side surface of the lower end of the cam member 30, and the beater return spring 18 is hooked to the spring-loaded roller 17 via a hanging ring 19.

When the footboard 11 is stepped down, the cam member 30 rotates together with the rotation shaft 4 while stretching the beater return spring 18.
When the depressing force of step 1 is released, the beater return spring 18 rotates in the opposite direction by the tensile force of the beater return spring 18, and the rotating shaft 4 is rotated in the beater return direction, which adjusts the beater amplitude, that is, the return position of the beater 6. To adjust, loosen the lock screw 32 and move the cam member 30 against the rotation shaft 4.
This is done by rotating the

In other words, this beater amplitude adjustment device adjusts the beater amplitude by rotating the cam member 30 about the rotation shaft 4 instead of changing the connecting position of the beater return spring to the cam member. According to this beater amplitude adjustment device, all that is required is to loosen the lock screw 32 of the cam member 30 to adjust the return position of the beater 6, and then tighten the lock screw 32 again to fix the cam member 30 to the rotating shaft 4. The beater width can be easily adjusted by operation.

Moreover, in this beater width adjusting device, the cam member 30 is tightened and fixed to the rotating shaft by reducing the slotted portion 31 of the cam member 30.
can be fixed to the rotating shaft 4 at any rotation angle, and therefore the beater amplitude can be adjusted in infinitely small steps. This rotation shaft 4 is attached to the mating end.
A cylindrical cam receiver 4a having a larger diameter than that is fitted and fixed,
Since the cam member 30 is tightened and fixed on the outside of this large-diameter cam receiver 4a, the cam member 30
Since the contact area between the rotation shaft fitting hole 0 and the cam receiver 4a can be increased, the cam member 30 can be securely fixed to the rotation shaft 4 so as not to be unnecessarily shifted due to vibration or the like. I can do it.

[Effect of idea]

According to this invention, it is possible to easily adjust the beater amplitude in small increments, making it possible to finely adjust the volume of the performance sound and the speed at which the drum is struck. A cylindrical cam holder with a larger diameter than this rotating shaft is fitted and fixed to the end of the rotating shaft, and the diameter of the cam member fitting end of the rotating shaft is increased, and a cam member is attached to the outside of this large diameter cam holder. Since the cam member is tightened and fixed, the contact area between the rotation shaft fitting hole of the cam member and the cam receiver is increased, and the rotation shaft is securely fixed to prevent the cam member from shifting unnecessarily due to vibrations, etc. It can be kept fixed.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of this invention. Figures 1 and 2 are side and front views of the drum pedal, and Figure 3 is taken along line A-A in Figure 2. FIG. 4 is an enlarged sectional view taken along line BB in FIG. 3. Figures 5 to 8 show a conventional beater adjustment device. Figures 5 and 6 are side and front views of the drum pedal, Figure 7 is an enlarged view of the cam plate, and Figure 8 is an enlarged view of the cam plate. It is an explanatory view of beater width adjustment. 1...base, 2...pillar, 4...rotation axis, 6
... Beater, 18 ... Beater return spring,
30...Cam member, 31...Slit portion, 32...
...lock screw.

Claims (1)

[Scope of utility model registration request] A drum head is constructed of a base on which a support is erected, a rotation shaft supported horizontally on the upper end of the support, and a base attached to a beater support member fixed to the rotation shaft, which is rotated by stepping down on a footboard. a cam member attached to the end of the rotation shaft to rotate integrally with the rotation shaft; and a cam member connected to a position eccentric from the rotation center of the cam member to rotate the cam member in one direction. In the drum pedal, the cam member is provided with a beater return spring that is pulled by the cam member, and the cam member has a slot for opening the fitting hole to the outer surface of the cam member on one end side. The cam member is rotatably fitted to the outside of a cylindrical cam receiver having a larger diameter than the rotary shaft that is fitted and fixed to the end of the rotary shaft, and the cam member is The slotted portion is reduced by tightening a lock screw that is inserted from the outside into one of the side plate portions that sandwich the slotted portion and is screwed into the other side plate portion, and the slotted portion is tightened and fixed to the cam receiver. Features a beater width adjustment device for drum pedals.