JPS6245557B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightening device for fixing in any adjustment position a retaining member coaxially and slidably guided on a rod or the like in a percussion instrument, in particular for cymbals, cymbals, etc. A clamping device for height-adjustably holding a percussion instrument such as a percussion instrument, a drum, etc., wherein the holding member surrounds a rod or the like and has a chamber tapered in the loading direction. This invention relates to a rod having a shape in which rolling elements are provided to produce a tightening action between the indoor wall and the rod.

Clamping devices in percussion instruments, whether for fixing legs of variable length or for height-adjustable holding of musical instrument parts, e.g. movable cymbal disks of cymbal devices, are subject to significant impact loads. exposed to Furthermore, the natural vibrations of the musical instrument still influence the clamping position in response to the percussion for a relatively long time.

What is required in this case is that the two parts connected by the tightening device are securely fixed to each other in their respective positions, so that no positional changes occur during performance that would require subsequent adjustment. That's true. Various conventional configurations do not fully meet the above requirements.

In the case of a tightening device of the type mentioned at the outset, the chamber has a circular cross section. A conically shaped chamber section is connected to the cylindrical chamber section. A steel ball is inserted as a rolling element between the cylindrical rod and the interior wall, and the steel ball is pressed into the tapered annular gap by gravity or by a pressure spring, and in this way The two parts are secured together. The clamping force is increased by increasing the axial force on the rod in the direction towards the tapered chamber end. The ball is released from its clamped position by means of an axially movable ring.

Even with such a tightening device, it is impossible to avoid loosening of the steel ball and, therefore, axial movement of the rod and the holding member during vigorous playing. This is probably due to the fact that only point contact is made between the ball and the rod surface or inner wall of the retaining member. The spherical shape allows movement of the clamping body in all directions, so that the ball rolls over the rod surface in a helical pattern (with very small pitches) due to the vibrations produced during playing.

SUMMARY OF THE INVENTION It is therefore an object of the invention to provide a tightening device of the type mentioned at the outset, in which relative movement of the rod or the like and the holding element is avoided even under excessive loads.

In order to solve this problem, the invention provides that the chamber has two opposite, oppositely inclined walls, and that the rolling elements consist of rollers with at least a cylindrical cross section, and that the rolling elements consist of rollers with at least a cylindrical cross section. The central region is adapted to the cross-sectional shape of a rod or similar. The rolling elements of the tightening device according to the invention can only be moved in the axial direction of the chamber or rod. Spiral movements, which would lead to dissociation, as would occur with spherical rolling elements, are avoided. Furthermore, a linear contact is created between the roller and the rod or holding member, which is more effective in tightening than the point contact that occurs when spherical rolling elements are used.

The rod or the like can have a rectangular, preferably square, cross-section, in which case the roller has a cylindrical shape.

However, it is also possible for the rods or the like to have other cross-sectional shapes, for example circular, hexagonal or octagonal cross-sections, in which case the rollers are provided with cutouts of a shape corresponding to the rod cross-section. You need to be prepared.

Advantageously, an actuating device for the rollers acting towards the tapered end of the chamber and a roller disengaging device acting towards the widening end of the chamber are provided. In this case, the actuating device consists of a plate that engages above the roller and an adjusting screw or the like that displaces the plate against the action of at least one spring serving as a roller disengagement device. It is advantageous if the plate and the adjusting screw each have a central opening for guiding a rod or the like therethrough. In this way, a perfect actuation force is obtained which guarantees a reliable fixation of the roller in the tapered gap.

The invention will now be explained with reference to the illustrated embodiment.

The cymbal device shown in FIG. 1 has a pedestal leg 1 on which a support tube 2 for a lower cymbal disc 3 is fixed. Inside the support tube 2 is a rod 4 supported by a spring (not shown).
is longitudinally slidably guided, and the rod 4 projects from the support tube 2 at the top and bottom. A holding member 5 is attached to the upper end of the rod 4.
The upper cymbal disk 6 is fixed by the rod 4, while a pedal 7 is engaged with the lower end of the rod 4.

As is clear from FIG. 2, the holding member 5 is
It is composed of a casing 9 equipped with. room 8
has a rectangular cross section (Figs. 3 to 5)
figure). The two opposing chamber walls 10, 11 are slightly sloped in opposite directions, so that the chamber 8 tapers somewhat downwards. A roller 12 is provided between the chamber walls 10, 11 and the rod 4, and plates 13, 14 that engage with the roller are arranged above and below the roller 12. The lower plate 14 is supported by a pressure spring 15, while on the upper plate 13 an adjusting screw 16, which can be screwed into the housing 9, acts. The adjusting screw 16 is provided with a notched head 17.

The upper cymbal disk 16 is clamped and fixed between a flange 18 fixed to the casing and a flange 19 of a threaded bushing 20, while the lower cymbal disk 13 is mounted on a flange 21 fixed to the support tube. It is installed.

The rod 4 can have a square cross section (FIG. 3). In this case, the roller 12 has a cylindrical shape.

However, it is also possible for the rod 4 to have other cross-sectional shapes, for example hexagonal (FIG. 4) or circular (FIG. 5). In this case, the roller 12 is provided with recesses 22, 23 whose shape corresponds to the cross section of the rod, so that linear contact of the roller 12 on the rod 4 is also guaranteed in the illustrated embodiment. .

The adjusting screw 16, the plates 13, 14 and the screw-in bush 20 each have a central opening through which the rod 4 is guided. In the case of a rod 4 of circular cross-section (FIG. 5), all openings are again of circular design and matched to the rod diameter. On the other hand, if the rod 4 has a rectangular cross section (FIGS. 3 and 4), the inner diameter of the central opening in the adjusting screw 16 and the threaded bushing 20 is at least as large as the cross section of the rod 4. corresponds to the diagonal, while plates 13 and 14
Advantageously, the opening in has the shape of a rod cross-section.

It is possible to provide a viewing window in at least one of the walls extending at right angles to the inclined chamber walls 10, 11, ie in the front chamber wall and/or in the rear chamber wall.

Instead of the pressure spring 15, it is also possible to provide a manually adjustable mechanical roller release device.

Next, the mode of operation of the tightening device according to the present invention will be described.

When the adjusting screw 16 is unscrewed in the direction of the arrow 24, the roller 12 is moved upwards by means of the pressure spring 15 via the plate 14, ie in the direction of movement of the adjusting screw 16. The outer surface of the rod 4 and the chamber wall 10,
The width of the gap formed between the roller 12 and the roller 11 is
As soon as the roller 12 is located in a horizontal plane such that the diameter of the roller 12 is greater than the diameter of the retaining member 5 can easily slide on the rod 4.

When the adjusting screw 16 is screwed into the casing 9, i.e. slid in the direction of the arrow 25,
The roller 12 is connected to the pressure spring 15 via the plate 13.
Against this force, the roller 12 is pressed downward until it abuts the chamber walls 10, 11 and the outer surface of the rod 4. In this way, the holding member 5 is securely fixed in position on the rod 4.

When an axial force is applied to the rod 4 by the pedal 7 in the direction of the arrow 25, the roller 12 moves into the gap, thereby increasing the clamping force perpendicular to the rod 4.

The holding member 5 is released by unscrewing the adjusting screw 6. The push spring 15 is connected to the roller 1
2 upward to eliminate the tightening action. The holding member 5 is slidable on the rod 4 in both directions.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of the cymbal device, Fig. 2 is a sectional view showing the tightening device for holding the cymbal disk above the cymbal device, and Fig. 3 is the same as in Fig. 2.
4 is the same sectional view as in FIG. 3 showing a tightening device with a rod of hexagonal cross section, and FIG. 5 is a cross section of a tightening device with a rod of circular cross section. It is the same sectional view as FIG. 3. DESCRIPTION OF SYMBOLS 1... Frame leg, 2... Support tube, 3... Lower cymbal disk, 4... Rod, 5... Holding member, 6... Upper cymbal disk, 7... Pedal, 8... Chamber, 9... Casing, 10, 11... Chamber wall, 12...roller, 13,
14... Plate, 15... Pressing spring, 16... Adjusting screw, 17... Notched head, 18, 19, 21... Flange, 20... Threaded bush, 22, 23...
Notch, 24, 25...arrow.

Claims (1)

[Scope of Claims] 1. A tightening device for fixing a holding member coaxially and slidably guided on a rod of a percussion instrument at an arbitrary adjustment position, the holding member surrounding the rod. In the case of the type in which the chamber 8 has a tapered chamber in the load direction and is provided with rolling elements that produce a clamping action between the chamber wall and the rod, the chamber 8 is formed by two opposite and opposite chambers. It has walls 10, 11 inclined in the direction, and the rolling element consists of a roller 12 with at least a cylindrical cross section, the central area of which is adapted to the cross-sectional shape of the rod 4. A tightening device characterized by: 2. Tightening device according to claim 1, wherein the rod (4) has a rectangular cross section, and the roller (12) is of cylindrical design. 3. Tightening according to claim 1, wherein the rod 4 has a circular, hexagonal or octagonal cross section, and the roller 12 is provided with notches 22, 23 having a shape corresponding to the rod cross section. Device. 4 Direction toward the tapered end of the chamber 8 (arrow 2
5) A tightening device according to claim 1, further comprising an actuating device for the rollers 12 acting at 5). 5. Tightening device according to claim 4, characterized in that a roller release device is provided which acts in the direction (arrow 24) towards the widening end of the chamber 8. 6. said actuating device consists of a plate 13 engaging above the roller 12 and an adjusting screw 16 displacing said plate 13 against the action of at least one spring 15 serving as a roller disengagement device; 6. A tightening device as claimed in claim 5, in which the case plate 13 as well as the adjusting screw 16 each have a central opening for guiding the rod 4 through it.