JPS644150Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a drum leg that allows easy storage of leg pins.

As shown in FIG. 1, for example, a bass drum 1 of this type is normally used lying on its side on the floor, and is therefore provided with a pair of left and right legs 2 to prevent it from rolling. This leg 2 is detachably attached to the outer peripheral surface of the trunk body 3, and has a leg arm 4 fixed to the trunk body 3 with bolts and nuts as shown in detail in FIG. One end of a leg pipe 5 is connected and fixed to the arm 4 with a set screw or the like. A leg pin 6 is slidably inserted into the leg pipe 5, and a pipe attachment screw 7 is fitted and fixed on the outer peripheral surface of the tip, and a tightening nut 8 is screwed onto this. A washer 9, a tightening rubber 10, and a guide washer 11 are housed inside the tightening nut 8, and the tip of the leg pin 6 projects to the outside through these. An auxiliary leg pipe 12 is fitted and fixed onto the outer peripheral surface of the protruding end of the leg pin 6, and a leg rubber 13 for preventing the leg 2 itself from slipping is crowned. In this case, the leg rubber 13 is configured to be moved downward as shown by the chain line due to the engagement relationship between the engagement pin 14 and the engagement groove 15, and thereby the floor surface on which the bass drum 1 is installed. By storing the conical end portion 6A of the leg pin 6 in the leg rubber 13 when the leg pin 6 is made of a member that is easily damaged, such as a plate surface, or when not in use or during transportation,
This prevents damage to the floor surface and ensures safety.

In addition, when the tightening nut 8 is tightened, the tightening rubber 10 is pressed against the washer 9 by the guide washer 11, so that the leg pin 6 is compressed in the axial direction.
The frictional force at this time fixes the leg pin 6. On the other hand, when the tightening nut 8 is loosened, the leg pin 6 is released from the tightening rubber 10, whereby the length of the leg pin 6, in other words the leg 2, can be adjusted.

However, in such a drum leg 2, when the conical end portion 6A of the leg pin 6 is taken out or retracted from the leg rubber 13, it is necessary to rotate the leg rubber 13 and simultaneously move it in the axial direction. Therefore, there were two operations, which caused problems in operability.
Further, the amount of protrusion of the conical end portion 6A of the leg pin 6 is determined by the width of the engagement groove 15, and there is also the disadvantage that it cannot be adjusted to an arbitrary amount of protrusion.

In addition, as disclosed in Japanese Utility Model Publication No. 47-3581, a screw ring fitted into the tube of the rubber cylinder bottom is screwed into a screw rod whose tip is formed at an acute angle, and the screw is operated to open the rubber cylinder bottom. Some models have a structure in which the tip of the screw rod can protrude outward, but even in such a structure,
Although the amount of protrusion of the tip of the screw rod can be adjusted, the rubber tube bottom etc. must be rotated many times, making it difficult to operate, and vibrations during playing are transmitted to the threaded portion, causing the tip of the screw rod to touch the rubber tube bottom. There was a problem of being immersed or standing out.

This idea was made in view of the above-mentioned points, and a leg stopper base made of leg rubber is provided at the tip of the leg shaft, and inside this leg stopper base, approximately A leg pin that has a conical tip and a base with an inclined surface formed on the side surface and can be freely extended and retracted, and a spring that constantly biases the leg pin in the projecting direction are provided, and the leg pin is screwed into the leg stopper base. By pressing and fixing the base inclined surface of the leg pin with the attached tightening bolt, the leg pin can be stored and pulled out only by rotating the tightening bolt, improving operability. The positional relationship between the leg pin and leg stopper base can be firmly maintained,
Furthermore, the present invention provides a drum leg in which the amount of protrusion of the leg pin from the leg stopper base can be arbitrarily set.

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 3 is a partially cutaway side view showing an embodiment of the drum leg according to this invention. Components in the drawings that are the same as those shown in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted. In the same figure, one end of an outer tube 20 into which a leg shaft 5 made of a hollow shaft is slidably inserted is connected and fixed to the leg arm 4, and the outer circumferential surface of the other end of the outer tube 20 is fastened. Fixing block 2 with attached bolt 21
2 is fixed. The tip of the tightening bolt 21 is inserted into a small hole (not shown) provided in the outer tube 20 and presses against the outer peripheral surface of the leg shaft 5.
This tightening bolt 21 is used to fix the leg shaft 5.
By loosening , the length of the leg shaft 5 is adjusted. In addition,
A hollow shaft (pipe) is lighter as the leg shaft 5,
Although it is convenient for transportation, if strength is required for tightening the tightening bolt 21, etc., a solid shaft may be used.

The opening on the distal end side of the leg shaft 5 is closed by a washer 23, and the washer 23 is fitted onto the outer circumferential surface of the distal end of the leg shaft 5 and fixed to the leg stopper base 2.
4 is pressed against the open end of the leg shaft 5. The leg stopper base 24 is formed in a hollow shape,
A leg pin 6 is provided inside the leg pin 6, which is movable in the axial direction of the leg shaft 5 and is freely retractable from the stopper base 24.
A conical coil spring 25 is housed therein, which constantly biases the leg pin 6 in the direction of protruding from the leg stopper base 24. Further, a leg rubber 13 is mounted on the outer peripheral surface of the tip end of the leg stopper base 24, and a tightening bolt 26 for fixing the leg pin 6 is provided.
is screwed on.

The leg pin 6 is long in the axial direction of the leg shaft 5,
It has a substantially columnar shape with a substantially conical tip portion 6A and a base portion 6B, and this portion is housed in a hollow portion within the leg stopper base 24 with the base portion 6B side facing upward. In the case of FIG. 3, the base 6B is a substantially hexagonal prism, and the side surface of the prism that is pressed by the tightening bolt 26 is formed obliquely, resembling one of the slopes of a truncated hexagonal pyramid. When a force in the retraction direction is applied to the leg pin 6, a wedge action is generated between the leg pin 6 and the tip of the tightening bolt 26.

Further, the distal end portion 6A faces downward and normally projects outward from a small hole 27 formed in the center of the lower surface of the leg rubber 13 by the force of a spring 25. In this case, the leg pin 6 is configured such that its maximum outer diameter, that is, the outer diameter of the boundary between the tip 6A and the base 6B, is set to be slightly larger than the outer diameter of the lower end opening of the leg stopper base 24. Falling out of the par base 24 is prevented.

The tightening bolt 26 is provided corresponding to the base 6B of the leg pin 6, and when tightened, its tip presses one surface of the base 6B to fix the leg pin 6 and prevent the leg pin 6 from rotating. prevent. Note that if the shape of the hollow part in the leg stopper base 24 is made into a square hole shape corresponding to the shape of the base 6B of the leg pin 6, the rotation of the leg pin 6 can be stopped more easily. In addition, by pushing up the leg pin 6 against the spring 25 and fixing the leg pin 6 at that position with the tightening bolt 26, the amount of protrusion of the tip 6A can be adjusted as desired, and the leg pin 6 can be tightened to the leg stop. It can be completely housed within the par base 24. Further, the leg pin 6 is attached to the base 6
Since the inclined side surface of B is pressed by the tightening bolt 26, the leg stopper will not accidentally sink into the leg stopper base 24 due to vibrations during performance. Furthermore, since the leg pin 6 is always urged in the protruding direction by the spring 25, even if the tightening bolt 26 is loosened, the leg pin 6 will not be retracted into the leg stopper base 24 unless a particular retraction force is applied to the leg pin 6. It is easy to position the leg pins 6 without having to do anything. When storing the leg pin 6, by loosening the tightening bolt 26 while pressing the leg pin 6 against the floor surface, the leg pin 6 can be stored against the spring 25, and then the tightening bolt 26 is released again.
All you have to do is tighten it to prevent it from protruding.

In the above embodiment, the upper end of the leg pin 6, that is, the base 6B, is formed into a substantially hexagonal prism, but the invention is not limited to this, and it goes without saying that it can be formed into various shapes. Tightening bolt 26
It may be of any shape as long as the side surface that comes into contact with it is inclined and a wedge effect can be obtained.

As explained above, according to the drum leg according to this invention, the leg pin is provided so as to be freely retractable and is constantly biased in the projecting direction by the spring, and the inclined surface provided on the side surface of the base of the leg pin is oriented laterally. Since it is configured to be fixed by pressing with a tightening bolt, the amount of protrusion of the leg pin can be adjusted as desired by adjusting the tightening level of the tightening bolt, and it also prevents the leg stopper base of the leg pin from sinking due to vibration etc. The positional relationship between the leg pin and the leg stopper base can be firmly maintained. In addition, the leg pins are biased in the protruding direction by springs, so even if the tightening bolt is loosened, the leg pins will not sink into the leg stopper base unless a particular force is applied to the leg pins. Positioning is easy and reliable, and handling can be improved.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a bass drum equipped with conventional drum legs, Fig. 2 is a partially cutaway side view of the same drum leg, and Fig. 3 is an embodiment of the drum leg according to this invention. It is a partially broken side view shown. 2... Drum leg, 5... Leg pipe (leg shaft),
6... Leg pin, 13... Leg rubber, 24... Leg stopper base, 25... Spring, 26... Tightening bolt.

Claims (1)

[Scope of utility model registration request] A leg stopper base made of leg rubber is provided at the tip of the leg shaft, and inside the leg stopper base there is a substantially conical tip and a base with an inclined surface formed on the side surface. A leg pin that can be freely extended and retracted and a spring that constantly biases the leg pin in the projecting direction is provided,
A drum leg, characterized in that the base inclined surface of the leg pin is pressed and fixed by a tightening bolt screwed onto the leg stopper base.