JPH0134236Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drum support device that is attached to a bass drum or the like to set a small drum such as a tom-tom in a desired angular position.

For example, a device for adjusting and attaching a tom-tom to a desired angular posture on a bass drum includes a holder having a substantially hemispherical concave surface manufactured by die casting on a support that is erected and fixed to the bass drum. A pressing tool having a substantially hemispherical concave surface corresponding to the concave surface corresponding to the concave surface, also manufactured by die-casting, is attached to this holder with a screw so that the corresponding interval can be adjusted, and a support rod for supporting the tom-tom. When the screw is tightened, the synthetic resin sphere implanted with is pressed between the concave surfaces of the holder and the pressing tool, and the supporting rod is fixed at an arbitrary angle. Or, due to the vibrations received during playing, the sphere slides on both concave surfaces and rotates, causing the tom-tom's set posture to change during the performance. The thickness of the corners of the outer surface of tools and press tools is significantly thicker than that of the bottom and sides, and the wall thickness of each part is uneven, so they may deform due to differences in the cooling rate of each part during casting. There was a problem that caused a row of turtles to appear.

It is an object of the present invention to provide a drum support device that eliminates such problems, has good casting properties for the holding tool and the pressing tool, and is capable of firmly fixing the drum.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a drum support device adapted to support two tom-toms, with left and right circular bulges 2 attached to the upper end of a support 1 made of a metal pipe that is fixed to a bass drum (not shown). , 2 are each fixed with a holder 3 manufactured by die casting having a substantially hemispherical concave surface 2a.
On the lower surface of the press tool 6, which is manufactured by die-casting and has a substantially hemispherical concave surface 5a corresponding to the concave surface 2a on the back surface of the circular bulge 5, one end of each is rotated by a shaft 7. The concave surfaces 2a and 5 of the holding tool 3 and the pressing tool 6 are freely supported.
A synthetic resin ball 15 on which an L-shaped support rod 12 for supporting a tom-tom (not shown) is implanted is inserted between the two concave surfaces 2a and 5a, and the balls 15 are formed corresponding to each other on the sides of both concave surfaces 2a and 5a. The base of the support rod 12 protrudes from between the cut grooves 21 and 22, and the wing nut 20 is screwed onto the bolt 18 inserted into the through holes 16 and 17 of the holder 3 and the presser 6, as shown in FIG. The support rod 12 is fixed at a desired angle by clamping the ball 15 between the concave surfaces 2a and 5a and preventing its rotation.

As shown in FIGS. 2 to 4, the concave surface 5a of the pressing tool 6 is formed with a large number of spiral protrusions 8 whose direction gradually changes from the radial direction to the circumferential direction. The tip is rounded so as not to damage the surface of the ball 15, and has a deep relief groove 10 in the shape of a planar arc that reaches near the outer surface of the bulge between adjacent protrusions 8, 8 on the concave surface 5a. is formed on the concave surface 2a of the holder 3, and a large number of protrusions 9 are formed in a spiral shape in the opposite direction to the protrusions 8 on the concave surface 5a of the pressing tool 6, and each protrusion 9
A deep relief groove 13 is formed between them in the same manner as described above.

Since the central portions 8a and 9a of each of the protrusions 8 and 9 face in the radial direction, and the outer peripheral portions 8b and 9b face in the circumferential direction, the rotation of the ball 15 around the horizontal axis tightened by both concave surfaces 2a and 5a The movement is mainly prevented by the biting of the center portions 8a, 9a of each protrusion 8, 9, and the rotation around the vertical axis is mainly prevented by the bite of the center portions 8a, 9a of each protrusion 8, 9.
The ball 15 is reliably prevented from rotating in any direction, and the support rod 12 is firmly fixed at a desired angle.

In this embodiment, the protrusions 8 and 9 are spirally formed in opposite directions on the concave surfaces 2a and 5a of the holder 3 and the presser 6, but they may be formed in the same direction. 8, 9 and the relief grooves 10, 13 may be formed only on either the holding tool 3 or the pressing tool 6.

As specifically explained in the above embodiment,
In the drum support device of the present invention, a metal holder having a hemispherical concave surface is fixed to a support, and a metal pressing tool having a hemispherical concave surface corresponding to the concave surface is adjusted at a corresponding interval to the holder. Freely install it,
In the drum support device, the drum support rod is fixed at an arbitrary angle by pinching a synthetic resin sphere with a drum support rod implanted between the concave surfaces of the holder and the pressing tool, wherein the holder or the The gist is that a plurality of protrusions are formed in a spiral shape on at least one concave surface of the pressing tool, and a deep relief groove reaching near the outer surface of the holding tool or the pressing tool is formed between each of the protrusions. The rotation of the sphere around the horizontal and vertical axes is reliably prevented by the biting of the radially oriented central portion and the circumferentially oriented outer peripheral portion of the spirally formed protrusion,
The drum support rod is firmly fixed at an arbitrary angle, and there is no problem that the set posture of the drum supported by the drum support rod changes due to vibrations during performance.
Since relief grooves are formed in the concave surface and the thickness is made uniform, it is possible to prevent deformation and tortoise formation due to differences in the cooling rate of each part during casting.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a sectional view of its main parts, Fig. 3 is a plan view of the pressing tool, and Fig. 4 is a perspective view of an embodiment of the present invention.
The figure is a sectional view taken along the line A--A in FIG. 2. 1: Post, 3: Holder, 6: Pressing tool, 8, 9:
Projection, 10, 13: relief groove, 12: drum support rod, 15: ball, 2a, 5a: concave surface.

Claims (1)

[Scope of utility model registration request] A metal holder having a hemispherical concave surface is fixed to a support column, a metal pressing tool having a hemispherical concave surface corresponding to the concave surface is attached to the holder at freely adjustable intervals, and a drum support rod is installed. In the drum support device, the drum support rod is fixed at an arbitrary angle by clamping a synthetic resin sphere implanted with the concave surfaces of the holder and the pressing tool. A drum support device characterized in that a plurality of protrusions are formed in a spiral shape on at least one concave surface, and a deep escape groove reaching near the outer surface of the holding tool or the pressing tool is formed between each of the protrusions. .