Percussion musical instrument (DRUM) and drumhead tensioning device (variants)

Abstract

The invention relates to musical instruments and can be used in percussion musical instruments. The technical result consists in providing reliability and maintainability through optimization of the design of a percussion musical instrument and drumhead tensioning devices designed to expand the expressive possibilities of musical instruments. This result is achieved by means of a shell configured in the form of interconnected layers of slats, the slats of each layer being connected along their edges and angled 10° to 45° in relation to the vertical axis, wherein the angle of inclination of a subsequent layer is opposite to that of the previous layer, and a drumhead tensioning device, configured in the form of an outer hoop (3) which provides the possibility of securing the drumhead hoop (4) and possibilities for tensioning the drumhead (5) by means of a screw connection with spiral guides (7) disposed about the diameter of the shell, wherein mounted at the top of the outer hoop (3) via a connection (11) is a roller (10) for securing the drumhead hoop (4) and transferring vertical movement thereto, thereby adjusting the tension on the drumhead (5), and mounted at the bottom of the outer hoop (3) is a toothed member (12) which is engageable with a worm gear (23), the rotation of which worm gear makes it possible to move the outer hoop (3) along the aforementioned spiral guides (7).

Description

[0001] PERCUSSION MUSICAL INSTRUMENT (DRUM) AND MEMBRANE TENSIONING DEVICES (OPTIONS)

[0002] DESCRIPTION

[0003] The invention relates to musical instruments and can be used in percussion musical instruments [G10D 13 / 00, G10D 13 / 01, G10D 13 / 02, G10D 13 / 10].

[0004] A METHOD AND DEVICE FOR TUNING A MUSICAL DRUM are known from the prior art [US 2009064844 A1, published: 12.03.2009], comprising a drum body including a drum shell, wherein the drum shell has an opening at least at one end; a drum ring, having a size that allows it to be placed on the body from one end in order to hold the drum skin between the drum body and the drum ring, wherein the drum skin is stretched over one of the openings of the drum body; an outer annular element attached to the drum body; an inner annular element in contact with the outer annular element, the drum shell and the drum ring; and means for rotating the inner ring relative to the outer ring in order to increase or decrease the tension of the drum skin.

[0005] A DRUM TENSIONING SYSTEM is known from the prior art [US 4218952 A, published 08 / 26 / 1980], where the drum comprises a cylindrical drum shell and a drum head protruding above the open end of the drum shell and limited by a circumferential hoop lying outside the drum shell; a counter hoop resting on the hoop of the drum head for tensioning the drum head, wherein the drum shell and the counter hoop form an annular channel between themselves; interacting low-friction cam means and tension means extending into the annular channel, one from the drum shell and the other from the counter hoop, the cam means comprising a number of individual cam sliders spaced around the annular channel, each cam slider extending in the direction of its length only over a portion of the circumference of the annular channel, and all cam sliders forming the same angle in the direction of their length with a plane perpendicular to the axis of the drum,the cam and tension means are arranged in such a way that one of them, which extends from the drum shell, overlaps the other and contacts the other only through the lower surface of the overlying and the upper surface of the underlying along an area that does not increase or decrease during rotation of the counter hoop about the axis of the drum, so that rotation of the counter hoop about the axis of the drum is not unduly impeded by friction and moves the counter hoop in the axial direction of the drum; the cam and tension means are also designed and connected to each other in such a way that said counter hoop can be lifted from said drum shell when said counter hoop and the drum shell are in predetermined relative rotated positions; means for rotating the counter hoop about the axis of the drum relative to the drum shell and, by means of the cam means and tension means,thereby simultaneously moving the counter hoop in the axial direction to change the tension of the drum membrane; an additional ring between the counter hoop and the drum membrane hoop, through which the counter hoop rests on the drum membrane hoop; and means for adjusting the inclination of the counter hoop relative to the additional ring.

[0006] Also known from the prior art is a DRUM TUNING APPARATUS [US 8404957 B2, published March 26, 2013], wherein the tuning unit of an acoustic drum includes a single adjustment function that allows for uniform variation of the tension of the drumhead around the periphery of the drumhead. The tuning mechanism includes several rings located between the end of the drum shell (or support ring) and the "underside" of the drumhead, which is otherwise held relative to the drum shell by a hoop or rim secured in place by threaded tension rods and lugs or other hoop locking mechanism. The single adjustment function varies the circumference of a wedge ring, which creates an axial force that "expands" or "retracts" the tuning unit along the central axis of the drum. As the tuning unit "expands" axially, it is pressed "up" ever more strongly against the drum head, changing its tension and the musical pitch of the drum.When the tuning assembly is "pulled" in the axial direction, it reduces the "upward" force, differently reducing the tension on the drum head and lowering the musical pitch of the drum. The prior art also discloses a DEVICE FOR TUNING A HOOP AND COUNTER-HOOP FOR A DRUM [US 6043419 A, published 03 / 28 / 2000], which includes a drum shell, a drum head, a counter-hoop, and a shell hoop; the drum skin extends over the open end of the drum shell and has an annular flange; the counter-hoop has a flange projecting downwards and outwards, which rests on the edge; the shell hoop has an edge that extends upwards and outwards; an adjustable clamping ring engages the flange of the counter-hoop and the edge of the shell hoop through corresponding inclined portions; the clamping ring has an opening and a tightening mechanism so that when the clamping ring is tightened, the counter-hoop is lowered downwards, thereby tensioning the membrane.

[0007] The closest in technical essence is the DEVICE FOR TIGHTENING AND ADJUSTING THE MEMBRANE OF A DRUM [US 7138574 B1, published: 21.11.2006], having a rim and a casing mounted on a part of the drum body; the device uses an annular element having a guide; a fastener is also used to hold the annular element relative to the drum body; a retainer is provided that includes a surface for engaging with the rim of the drum head, with at least one projection that engages with the guide of the annular element; the retainer is configured to rotate, moving the projection along the guide in order to loosen or tighten the drum plastic lining upon contact with the drum body.

[0008] The main technical problem of the analogs and prototypes is the complexity of the system for connecting the components of the devices, which does not ensure operational efficiency, reliability and ergonomics of use, and the lack of expressive capabilities of musical instruments.

[0009] The main objective of the invention is to eliminate the shortcomings of analogues and the prototype.

[0010] The technical result consists in ensuring reliability and operational manufacturability due to the optimization of the design of a percussion musical instrument and membrane tension devices, made to expand the expressive capabilities of musical instruments. The specified technical result is achieved due to the fact that a percussion musical instrument (drum), comprising a body, a membrane tension device with the ability to transfer an axial load to the rim of the membrane 4, providing tension of the membrane 5 on the body, characterized in that the body is made in the form of interconnected layers of slats, the slats of each layer are connected along the edge and directed at an angle of 10 ° to 45 ° relative to the vertical axis, and the angle of inclination of the next layer is oppositely directed relative to the previous one,the membrane tensioning device is made in the form of an outer rim 3 providing the possibility of fixing the membrane rim 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, and in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the membrane rim 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the possibility of movement of the outer rim 3 along the mentioned spiral guides 7.

[0011] In particular, the interconnected layers of slats are made in the form of two interconnected layers of slats, internal 1 and external 2.

[0012] In particular, the interconnected layers of slats are made in the form of four inner 1 and outer 2 layers of slats connected in pairs.

[0013] In particular, to reduce the weight of the structure, the inner pair of layers of slats is made in the form of two separate rings connected by an outer pair of layers of slats.

[0014] In particular, the inner pair of layers of slats is extended relative to the outer pair of layers of slats.

[0015] In particular, the slats of each layer, connected along the edge to each other, are connected to each other with an adhesive base.

[0016] In particular, the layers of slats are connected to each other using an adhesive base.

[0017] In particular, the thickness of each of the layers of the slats, inner 1 and outer 2, ranges from 2 mm to 4 mm.

[0018] In particular, the thickness of the adhesive base ranges from 0.05 mm to 0.4 mm. In particular, the edge of the case has an additional bevel directed towards the central axis.

[0019] A membrane tensioning device made in the form of an outer rim 3 providing the possibility of fixing the rim of the membrane 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the possibility of movement of the outer rim 3 along the mentioned spiral guides 7, wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in a recess of the outer rim 3, the other end of the pin 9 is located in one of the spiral guides 7.

[0020] A membrane tensioning device made in the form of an outer rim 3 providing the possibility of fixing the rim of the membrane 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the possibility of movement of the outer rim 3 along the mentioned spiral guides 7, wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in a recess of the outer rim 3, the other end of the pin 9 is located in one of the spiral guides 7, the roller 10 is mounted through a through connection in the upper part of the U-shaped outer rim 3,tooth 12 is connected to the outer rim 3 through rack 13.,

[0021] A membrane tensioning device made in the form of an outer rim 3 providing the ability to fix the rim of the membrane 4 and the ability to tension the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the ability to move the outer rim 3 along the said spiral guides 7, wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a curved lower part of the outer rim 3, the size of which corresponds to providing the ability to move along the spiral guides 7, the tooth 12 is connected to the outer rim 3 through a rack 13. A membrane tensioning device,made in the form of an outer rim 3 providing the possibility of fixing the rim of the membrane 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the possibility of movement of the outer rim 3 along the mentioned spiral guides 7, wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other at the end parts of the U-shaped rod 17 by a rigid connection, the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9,one end of which is rigidly installed in the recess of the large ring 16, the other end of the pin 9 is located in one of the spiral guides 7.,

[0022] A membrane tensioning device made in the form of an outer rim 3 providing the possibility of fixing the rim of the membrane 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the possibility of movement of the outer rim 3 along the mentioned spiral guides 7, wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other at the end parts of the L-shaped rod 17 by detachable sixth 21 and fourth 19 connections, respectively,the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in the recess of the large ring 16, the other end of the pin 9 is located in one of the spiral guides 7.

[0023] A membrane tensioning device made in the form of an outer rim 3 providing the possibility of fixing the rim of the membrane 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the possibility of movement of the outer rim 3 along the mentioned spiral guides 7, wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other on the plate of an L-shaped rod 17 by detachable sixth 21 and fourth 19 connections, respectively,the screw connection of the spiral guides 7 with the outer rim 3 is made by means of a detachable connection 22 of the pin 9 with the lower end edge of the large ring 16, wherein the protruding end of the pin 9 is located in one of the spiral guides 7. In particular, the spiral guides 7 are made according to the diameter of the housing (Fig. 8). In particular, the spiral guides 7 are made according to the diameter of the inner rim 6, rigidly fixed to the housing.,

[0024] In particular, the spiral guides 7 are made in the form of continuous threaded longitudinal holes located parallel to each other. In particular, the spiral guides 7 are made of continuous profiled grooves.

[0025] Brief description of the drawings.

[0026] Fig. 1 shows a top view of the claimed device, in particular a cylindrical drum.

[0027] Fig. 2 shows a front view of the claimed device, in particular a cylindrical drum, and a sectional view AA.

[0028] Fig. 3 shows a top view of the claimed device, in particular a drum of convex cylindrical shape with an expansion along the central horizontal axis.

[0029] Fig. 4 shows the front view of the claimed device, in particular the drum of a convex cylindrical shape with an expansion along the central horizontal axis, as well as its sectional view of the explosive.

[0030] Fig. 5 shows a front view of the claimed device, in particular a cylindrical drum in partial section, with two internal rims 6 of the membrane tensioning device located on the body.

[0031] Fig. 6 shows a front view of the claimed device, in particular a drum of convex cylindrical shape with an expansion along the central horizontal axis, with one internal rim 6 of the device for tensioning the membrane, located on the body.

[0032] Fig. 7 shows a front view of the inner rim 6 of the membrane tensioning device.

[0033] Fig. 8 shows a front view of the claimed percussion musical instrument, in particular an example of implementation with two paired internal 1 and external 2 layers of longitudinal slats and guides made in the form of a thread on the outermost layer of longitudinal slats 2.

[0034] Fig. 9 shows a front sectional view of the first modification of the claimed membrane tensioning device and an example of a connection with a worm gear 23 for tension control.

[0035] Fig. 10 shows a front sectional view of the first modification of the claimed membrane tensioning device and the worm gear 23 in the folded position. Fig. 11 shows a top view of the worm gear 23. Fig. 12 shows a front sectional view of the second modification of the claimed membrane tensioning device (the worm gear 23 is not shown).

[0036] Fig. 13 shows a front sectional view of the third modification of the claimed membrane tensioning device (worm gear 23 is not shown).

[0037] Fig. 14 shows a front sectional view of the fourth modification of the claimed membrane tensioning device (worm gear 23 is not shown).

[0038] Fig. 15 shows a front view in section of the fifth modification of the claimed membrane tensioning device (worm gear 23 is not shown).

[0039] Fig. 16 shows a front sectional view of the sixth modification of the claimed membrane tensioning device (worm gear 23 is not shown).

[0040] The following are indicated on the figures: 1 - inner layer of racks, 2 - outer layer of racks, 3 - outer rim, 4 - membrane rim, 5 - membrane, 6 - inner rim, 7 - spiral guides, 8 - fastening, 9 - pin, 10 - roller, 11 - first connection, 12 - tooth, 13 - rack, 14 - second connection, 15 - third connection, 16 - large ring, 17 - rod, 18 - small ring, 19 - fourth connection, 20 - fifth connection, 21 - sixth connection, 22 - seventh connection, 23 - worm gear, 24 - axis, 25 - control element, 26 - folding base, 27 - static base, 28 - rotation axis, 29 - jumper.

[0041] Implementation of the invention.

[0042] In the present invention, operational manufacturability is understood to mean the manufacturability of a design during its preparation for use as intended, technical maintenance and repair of the design, as well as adjustment of the tool during operation.

[0043] In the present invention (Fig. 1-Fig. 16), a percussion musical instrument (drum) and membrane tensioning devices (variants) are intended for use in the music industry.

[0044] A percussion musical instrument (drum) at least contains a body, a membrane tensioning device with the ability to transmit an axial load to the membrane rim 4, which ensures the tension of the membrane 5 on the body.

[0045] The body is made in the form of interconnected layers of slats, at least one inner layer of slats 1 and one outer layer of slats 2 (see Figs. 1-6). Moreover, the shape of the structure of the percussion musical instrument (drum) can be made either cylindrical, or a convex cylindrical shape, or another shape.

[0046] The slats of each layer, the inner layer of slats 1 and the outer layer of slats 2, are connected along the edge and directed at an angle of 10° to 45° relative to the vertical axis of the body to ensure the necessary rigidity of the body during operation and, accordingly, the reliability of the body with a small thickness of the said slats.

[0047] Moreover, the angle of inclination of the next layer is oppositely directed relative to the previous one, that is, the angle of inclination of the inner layer of slats 1 is oppositely directed to the angle of inclination of the outer layer of slats 2 to ensure the integrity and rigidity of the structure as a whole.

[0048] Moreover, an inclination angle of 10°-45° between the aforementioned slats and the vertical axis was determined experimentally and determined to maximize the adhesion between the slat layers. An angle of less than 10° does not allow the proposed device to be implemented, while an angle greater than 45° reduces the adhesion between the slat layers, which negatively impacts manufacturing processability and complicates the operation process.

[0049] Moreover, as has been experimentally revealed, the angle of inclination of the inner layer of slats 1 and the angle of inclination of the outer layer of slats 2 may differ, but remain within the range of 10°-45°.

[0050] Moreover, the layers of slats connected to each other are made in the form of at least two layers of slats connected to each other, internal 1 and external 2 (Fig. 1-Fig. 6).

[0051] Moreover, the connection of oppositely directed layers (crosswise) - the inner layer of slats 1 and the outer layer of slats 2 - provides the necessary rigidity and, accordingly, the reliability of the body with a sufficiently small thickness of the slats, which directly affects the expressive abilities of the percussion musical instrument, in particular, the rigidity of the body affects the attack, the sharpness of which is achieved by achieving the maximum amplitude of the sound in response to the percussion action.

[0052] Moreover, the interconnected layers of slats can be made in the form of four inner 1 and outer 2 layers of slats connected in pairs (see Fig. 8). To reduce the weight of the structure, the inner pair of slat layers can be made in the form of two separate rings connected by an outer pair of slat layers (see Fig. 8). Moreover, the inner pair of slat layers can be extended relative to the outer pair of slat layers (see Fig. 8).

[0053] Moreover, the slats of each layer, connected along the edge to each other, can be connected to each other using an adhesive base.

[0054] Moreover, the four inner 1 and outer 2 layers of slats connected in pairs can be connected to each other additionally by a detachable fifth connection 20.

[0055] Moreover, the layers of slats can be connected to each other using an adhesive base.

[0056] Moreover, it has been experimentally established that the thickness of the adhesive base ranges from 0.05 mm to 0.4 mm; this range does not increase the thickness of the product, while maintaining the necessary reliability of the body due to the adhesion of the mentioned slats to each other.

[0057] Moreover, the mentioned adhesive base can be made as wood glue, two-component epoxy glue, Titebond or other glue used for wood or composite materials.

[0058] Moreover, the mentioned slats of the inner 1 and outer 2 layers of slats can be made of wood, carbon fiber, and also other composite materials similar in their physical characteristics.

[0059] Moreover, the slats of the inner 1 and outer 2 layers of slats can be made predominantly of the same width, however, different widths of the mentioned slats are also permissible.

[0060] Moreover, the slats of the inner 1 and outer 2 layers of slats can be made longitudinal, for example, rectangular, preferably diamond-shaped (taking into account the inclination of the said slats (Fig. 1, Fig. 2, Fig. 5, Fig. 8) and an additional bevel on the edges of the body (Fig. 5, Fig. 8, not designated by a number)) for cylindrical drums, an ellipse cut off from the edges for drums of a convex cylindrical shape (taking into account the inclination of the said slats (Fig. 3, Fig. 4) and an additional bevel on the edges of the body (Fig. 6, not designated by a number)) etc.

[0061] Moreover, the thickness of each of the slat layers, the inner 1 and outer 2, ranges from 2 mm to 4 mm. Moreover, the thickness of these slats should preferably be as uniform as possible to ensure a better fit and a streamlined shape for the percussion instrument, in particular the drum, as well as to ensure uniformity of the structure's weight and sound.

[0062] Experiments have shown that the thickness of these slats, and consequently of each layer—inner 1 and outer 2—can be selected within a range of 2 mm to 4 mm. This range is determined by the fact that a thickness of less than 2 mm does not provide the necessary cabinet rigidity, making the cabinet susceptible to cracking under impact. A thickness greater than 4 mm complicates the cabinet design during operation, specifically, complicating assembly. Slats thicker than 4 mm are difficult to bend, thus preventing high manufacturing efficiency, and also adds weight to the percussion instrument, which compromises the overall design's manufacturability.

[0063] It should be noted that the presence of at least two layers, the inner 1 and outer 2, with a thickness from 2 mm to 4 mm ensures the reliability of the structure required during operation by achieving the required rigidity of the structure, and also, as is known, drums with a small wall thickness, for example, within the range described above, are more “responsive” (the body responds more quickly to percussion actions), therefore, their sustain is shorter and their expressive capabilities are broader.

[0064] Moreover, the ends (not indicated in the figures, but shown in Fig. 1, Fig. 2) of the mentioned slats are aligned with each other, forming an edge to ensure a tight fit of the membrane 5 to the edge.

[0065] Moreover, the alignment of the ends of the longitudinal slats can be performed both before and after the assembly of the structure.

[0066] Moreover, the inner 1 and outer 2 layers of the slats can be made with an additional bevel on the edges of the body (not designated by a number in Fig. 5, Fig. 6, Fig. 8), directed towards the central axis, to expand the expressive properties of the musical instrument by ensuring a minimum contact distance between the lump and the membrane. Moreover, the formation of the said slats and their alignment, as well as the alignment of the ends and the execution of additional bevels, can be performed with a grinder, a plane, sandpaper of various grain sizes, or in another way.

[0067] Moreover, the membrane 5 can be made of a synthetic material (polyester) or other composite materials of sufficient strength and fixed to the rim of the membrane 4 using methods known from the prior art.

[0068] Moreover, the rim of the membrane 4 is a ring whose diameter exceeds the diameter of the body of the percussion musical instrument, to ensure the possibility of translational movement along the axis of the drum body and, accordingly, the tension of the membrane 5.

[0069] Moreover, the rim of the membrane 4 can be made of metal or other composite materials of sufficient rigidity.

[0070] The membrane tensioning device (Fig. 9-Fig. 16) is made in the form of an outer rim 3 providing the possibility of fixing the membrane rim 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing.

[0071] It's worth noting that the aforementioned screw connection (screw-type mechanical transmission) is achieved by screwing the outer rim 3 onto the aforementioned spiral guides 7, thereby setting the membrane rim 4 in translational motion by transmitting an axial load, ensuring uniform tension of the membrane 5 and the ability to adjust the expressive color of the sound. Furthermore, a roller 10 is mounted at the top of the outer rim 3 via a first connection 11 to secure and transmit vertical movement to the membrane rim 4, thereby adjusting the tension of the membrane 5.

[0072] Moreover, the outer rim 3 is a ring (Fig. 9, Fig. 10, Fig. 13), the diameter of which exceeds the diameter of the housing and the inner rim 6 so that between the spiral guides 7 and the outer rim 3 there is a sufficient distance for the free movement of the pin 9 along the spiral guides 7.

[0073] Moreover, the shape of the roller 10 can be made in the form of a volumetric rectangular parallelepiped, have a rounded shape, or any other shape that ensures contact with the rim of the membrane 4 and the transfer of uniform pressure to the rim of the membrane 4. Moreover, the roller 10 can be made of metal or other composite materials of sufficient rigidity.

[0074] Moreover, the roller 10 has a through hole to provide a detachable connection (bolt, stud, screw, etc.) with the outer rim 3 to ensure quick assembly and disassembly of the structure, as well as to perform repairs of individual parts in the event of their deformation.

[0075] In the lower part of the outer rim 3, a tooth 12 is mounted, connected to a worm gear 23, the rotation of which enables the movement of the outer rim 3 along the mentioned spiral guides 7.

[0076] In the first embodiment (Fig. 9, Fig. 10) of the membrane tensioning device, the screw connection of the spiral guides 7 with the outer rim 3 is made using a pin 9, one end of which is installed in a recess in the outer rim 3, the other end of the pin 9 is located in one of the spiral guides 7.

[0077] In the second embodiment (Fig. 12) the membrane tensioning device has the same principle of screw connection as in the first embodiment - the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in the recess of the outer rim 3, the other end of the pin 9 is located in one of the spiral guides 7,

[0078] However, roller 10 is mounted through a through joint in the upper part of the U-shaped outer rim 3 to provide additional rigidity to the structure by strengthening the pressure lever on the rim of the membrane 4.

[0079] The tooth 12 is connected to the outer rim 3 through the rack 13 (Fig. 12, Fig. 13).

[0080] This embodiment is implemented to provide additional rigidity and reliability of the membrane tensioning device, in the event that the ring of the outer rim 3 is thin and does not provide the possibility of embedding the tooth 12 into the recess of the said rim.

[0081] Moreover, the rail 13 can be made of wood or other composite materials of sufficient rigidity.

[0082] Moreover, the rail 13 may have the shape of a three-dimensional parallelepiped or other form. Moreover, the rail 13 may be connected to the outer rim 3 by a detachable connection, for example, a bolt, stud, screw, etc., in at least two places (see Fig. 12 - second connection 14), with the possibility of complete disassembly of the structure, or be rigidly fastened to the outer rim 3 using an adhesive base, etc.

[0083] Moreover, tooth 12 can be connected to rack 13 using a rigid connection, for example, using an adhesive base, etc.

[0084] In the third embodiment (Fig. 13) of the membrane tensioning device, the screw connection of the spiral guides 7 with the outer rim 3 is made using the curved lower part of the outer rim 3, the size of which is suitable to ensure the possibility of movement along the spiral guides 7.

[0085] Moreover, the curved lower part of the outer rim 3 can be made in the form of a protrusion in the shape and dimensions of the corresponding sized spiral guides 7 to ensure the possibility of movement along the spiral guides 7.

[0086] Here, the curved lower part of the outer rim 3 can be made in the form of spiral longitudinal protrusions in shape and size corresponding to the size of the spiral guides 7 to ensure the possibility of movement along the spiral guides 7.

[0087] In the fourth embodiment (Fig. 14) of the membrane tensioning device, the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other at the end parts of the U-shaped rod 17 by a rigid connection.

[0088] Moreover, the small ring 18 and the large ring 16 are rings (Fig. 14-Fig. 16) whose diameter exceeds the diameter of the housing and the inner rim 6 so that between the spiral guides 7 and the large ring 16 there is a sufficient distance for the free movement of the pin 9 along the spiral guides 7, and the diameter of the small ring 18 does not interfere with the transmission of vertical movement to the rim of the membrane 4 by the roller 10.

[0089] Moreover, the diameters of the small ring 18 and the large ring 16 may not be identical. Moreover, the small ring 18 and the large ring 16 can be made of wood, carbon fiber, or other composite materials.

[0090] Moreover, the said rigid, permanent connection can be achieved by making a solid structure out of wood, by welding, soldering if the said rings are made of metal, or by gluing if the said rings are made of wood or other composite materials.

[0091] The screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is rigidly installed in the recess of the large ring 16, the other end of the pin 9 is located in one of the spiral guides 7.

[0092] Moreover, the roller 10 is fixed on the small ring 18 by the first connection 11.

[0093] In the fifth embodiment (Fig. 15) of the membrane tensioning device, the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other at the end parts of the L-shaped rod 17 by detachable sixth 21 and fourth 19 connections, respectively.

[0094] The screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in the recess of the large ring 16, the other end of the pin 9 is located in one of the spiral guides 7.

[0095] Moreover, the small ring 18 is mounted on the upper part of the U-shaped rod 17 by the sixth connection 21.

[0096] Moreover, the fourth 19 connection can be made detachable, for example, stud, clamp, etc. to ensure quick assembly and disassembly of the structure, as well as to carry out repairs of individual parts in case of their deformation.

[0097] In the sixth embodiment (Fig. 16) of the membrane tensioning device, the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other on the plate of the L-shaped rod 17 by detachable sixth 21 and fourth 19 connections, respectively.

[0098] This embodiment of the above-mentioned connections can be made to provide additional rigidity to the structure by strengthening the pressure lever on the rim of the membrane 4.

[0099] The screw connection of the spiral guides 7 with the outer rim 3 is made by means of a detachable seventh connection 22 of the pin 9 with the lower end edge of the large ring 16, wherein the protruding end of the pin 9 is located in one of the spiral guides 7.

[0100] Moreover, the outer rim 3 in section can be made in an L-shape (see Fig. 15, Fig. 17), U-shape (see Fig. 12, Fig. 13, Fig. 14) or other shape (see Fig. 9, Fig. 10), allowing the placement of the above-mentioned elements on the outer rim 3.

[0101] Moreover, the outer rim 3 can be made of metal, wood, carbon fiber, as well as other composite materials that provide sufficient rigidity.

[0102] Moreover, pin 9 can be made of metal, wood, carbon fiber, as well as other composite materials that provide sufficient rigidity and the ability to move along the spiral guides 7.

[0103] Moreover, the shape of the pin 9 can be made in the form of a volumetric rectangular parallelepiped (Fig. 9, Fig. 10, Fig. 13, Fig. 14, Fig. 16), of various shapes, for example, in the form of a volumetric tetramino (Fig. 12, Fig. 15), etc. and having a cylindrical head to ensure sliding along the spiral guides 7.

[0104] Moreover, the connection of pin 9 in the recess of outer rim 3 (Fig. 9, Fig. 10, Fig. 12) or in the large ring 16 of outer rim 3 (Fig. 14, Fig. 15) can be made detachable by means of an insert, thus, the clamping force of worm gear 23 presses on outer rim 3 and does not allow pin 9 to fall out of spiral guides 7 and the recess of outer rim 3, respectively.

[0105] It should be noted that the size and shape of the said recess (Fig. 9, Fig. 10, Fig. 12, Fig. 14, Fig. 15) must correspond to the size and shape of the part of the pin 9 or the curved lower part of the outer rim 3 inserted into it, as shown in Fig. 13, so that the pin 9 or the curved lower part of the outer rim 3 is immovably and tightly seated in the said recess.

[0106] Moreover, the connection of pin 9 in the mentioned recess can be carried out by a detachable (Fig. 16) connection, namely bolted, clamp, etc.

[0107] Moreover, the connection of the pin 9 in the recess of the outer rim 3 can be carried out rigidly (Fig. 9, Fig. 10, Fig. 12, Fig. 14, Fig. 15), for example, due to the adhesive base, rigidly fixing the pin 9 in the recess of the outer rim 3 or on the outer rim. Moreover, the rod 17, U-shaped (Fig. 14) or L-shaped (Fig. 15, Fig. 16) can be made of metal, wood, carbon fiber, as well as other composite materials that provide sufficient rigidity.

[0108] Moreover, rod 17, U-shaped (Fig. 14) or L-shaped (Fig. 15, Fig. 16) can be made as a hollow tubular rod or have a solid structure.

[0109] Moreover, the above-mentioned first 11, second 14, third 15, fifth 20, sixth 21, seventh 22 connections can be made detachable, for example, bolted, studded, screwed, etc. to ensure quick assembly and disassembly of the structure, as well as to perform repairs of individual parts in the event of their deformation.

[0110] Moreover, the spiral guides 7 can be made according to the diameter of the housing (Fig. 8).

[0111] Moreover, the spiral guides 7 are made according to the diameter of the inner rim 6, rigidly fixed to the body (Fig. 5, Fig. 6).

[0112] Moreover, the inner rim 6 is a ring whose diameter exceeds the diameter of the case so that the inner rim 6 can be tightly fixed to the outside of the case.

[0113] Moreover, the inner rim 6 (Fig. 9, Fig. 10, Fig. 12, Fig. 13, Fig. 16) can be secured to the body using detachable connections, namely bolted, clamp, etc., or rigid, using an adhesive base.

[0114] Moreover, the inner rim 6 (Fig. 9, Fig. 10, Fig. 12, Fig. 13, Fig. 16) can be made of wood, carbon fiber, or other composite materials similar in their physical characteristics.

[0115] Moreover, the spiral guides 7 can be made on the upper layer of the outer layer of the rails 2 of the housing or on the inner rim 6 by milling, casting, stamping, etc.

[0116] Moreover, the spiral guides 7 can be made in the form of continuous threaded longitudinal holes, grooves (Fig. 8), located parallel to each other.

[0117] Moreover, the continuous thread (of the upper layer of the mentioned slats) can be made as a groove or several grooves located at the same distance from each other and in number to ensure the maximum permissible connection and tension of the membrane on all edges along the diameter.

[0118] Moreover, the spiral guides 7 can be made from continuous profiled grooves (Fig. 7).

[0119] Moreover, the mentioned profiled grooves can be connected to the body or to the inner rim 6 using fasteners 8.

[0120] Moreover, the fasteners 8 can be made in the form of detachable connections, namely bolted, clamp, etc.

[0121] Moreover, the number of spiral guides 7 and, correspondingly, membrane tensioning devices 5 must correspond to each other. To ensure uniform pressure on the rim of membrane 4 and, consequently, uniform tension of membrane 5 at all edges along the edge diameter, there must be at least two, equally spaced, as determined experimentally. This ensures sufficient reliability (including fastening) during operation and the ability to optimally adjust the tension of membrane 5 (operational manufacturability) to expand the expressive capabilities of the musical instrument.It is worth noting that the maximum number of spiral guides 7 and the membrane tensioning device 5, respectively, depends on the thickness of the spiral guides 7, the shape of the turns of the spiral guides 7, the rigidity of the rim of the membrane 4 and the diameter of the percussion musical instrument; accordingly, it is possible to install four and eight spiral guides 7 and membrane tensioning devices 5, for example, for percussion musical instruments of a large diameter, where the installation of two spiral guides 7 and, accordingly, membrane tensioning devices 5 is insufficient; however, experimentally, the conditions under which it is necessary to increase the number of spiral guides 7 and membrane tensioning device 5 more than two have not been identified.

[0122] Moreover, it has been experimentally established that the maximum number of revolutions of the spiral guides 7 sufficient to ensure the reliability of the connection of the outer rim 3 and the spiral guides 7, as well as the possibility of adjusting the tension of the membrane 5 to expand the expressive capabilities of the musical instrument, is two, however, this number depends on the shape and angle of revolution of the spiral guides 7 and the diameter of the percussion musical instrument.

[0123] Moreover, tooth 12 and worm gear 23 represent a kinematic pair and are predominantly made of metal or other composite materials that provide a gear-screw transmission.

[0124] Moreover, the worm gear 23 is a screw with a thread cut on a cylinder, which is rigidly fixed on the axis 24.

[0125] Moreover, tooth 12 is a threaded shaft that is rigidly fixed to the outer rim 3 (Fig. 9, Fig. 10) or its structural elements (Fig. 12 - Fig. 16). Moreover, the ends of axis 24 are secured to a folding base 25 with the possibility of free rotational movement of axis 24.

[0126] At least one connection of the axis 24 and the folding base 26 is made through a through hole in the folding base 26, and the said end of the axis 24 is connected to the control elements 25 (see Fig. 11).

[0127] Moreover, the movement of the axis 24 and, accordingly, the worm gear 23 rigidly fixed on it occurs by means of the rotational movement of the control element 25.

[0128] Moreover, the control element 25 can be made with edges, diamond-shaped or other shape, have a rubber or other attachment, providing the ability to grip it with the hand and perform free rotational movement without slipping of the fingers.

[0129] Moreover, the folding base 26 has at least one axis of rotation 28 with a static base 27 for implementing free rotational movement of the folding base 26 relative to the said axis in order to ensure the possibility of connecting the worm gear 23 with the tooth 12 or disconnecting the worm gear 23 from the tooth 12.

[0130] Moreover, to ensure the fixation of the mentioned connection of the worm gear 23 with the tooth 12, a jumper 29 is provided.

[0131] Moreover, the jumper 29 can be made as a fixing element in the form of a fastener, for example, a bolt, screw, stud, etc. Moreover, the static base 27 is rigidly fixed to the body of the musical percussion instrument, for example, using an adhesive base, bolt, keyway or other type of connection.

[0132] Moreover, free rotational movements of the mentioned elements can be achieved using rotating joints or articulated joints, and the elements of these joints can be made of metal or other composite materials.

[0133] Moreover, the folding base 25 can be made U-shaped in the front view (see Fig. 11) and have an L-shaped form in the side view (see Fig. 9, Fig. 10), or have another form, subject to the condition of providing the described gear-screw transmission.

[0134] Moreover, the static base 26 can be made U-shaped (Fig. 11) or have another shape, for example, consisting of two parallel parts, separately fastened to the body.

[0135] Moreover, the worm gear 23, the axis 24, the control element 25, the folding base 26, the static base 27, the rotation axis 28, the jumper 29 can be made of metal or other composite materials.

[0136] Moreover, tooth 12 and worm gear 23 and its above-mentioned elements can be made of metal and other composite materials.

[0137] The claimed device (Fig. 1-Fig. 16) operates as follows.

[0138] First, a sketch of the proposed musical percussion instrument is created.

[0139] It should be taken into account that the diameter of the inner 1 and outer 2 layers of slats differ, accordingly, the calculation of the dimensions (in particular the width) of the slats for each layer is carried out separately.

[0140] The dimensions and quantity of the mentioned slats are calculated in accordance with the planned diameter of the declared musical percussion instrument.

[0141] For a convex cylindrical shape (or other shape) of a musical percussion instrument, the calculation of dimensions is made taking into account the most convex part and the narrowest parts.

[0142] To ensure ease of installation of the enclosure, for example, if the shape of the musical percussion instrument differs from a simple cylindrical one, a three-dimensional model can be created from paper, wood, or another material. The enclosure structure is then assembled, first the inner layer of slats 1, by joining the edges of adjacent slats with an adhesive base at a specified angle.

[0143] Next, an adhesive base is applied to the outer side of the inner layer of slats 1 and each slat of the outer layer of slats 2 is progressively mounted, also connecting them with an adhesive base at an angle opposite to the specified angle of inclination of the inner layer of slats 1.

[0144] It is worth noting that the alignment of the ends of the longitudinal slats can be performed either before assembling the structure according to the pre-planned layout mentioned above, or after the installation of the housing, by filing and / or cutting the end sides to ensure a tight fit of the membrane.

[0145] Moreover, the formation of additional bevels on the edges (not designated by a number in Fig. 5, Fig. 6, Fig. 8) on the end in the direction of the central axis is preferably carried out after the installation of the housing structure, due to the fact that this minimizes the risk of error in calculating the angle of inclination of additional bevels taking into account the thickness of the mentioned layers of the housing.

[0146] Next, calculate the permissible distance for adjusting membrane 5, the minimum permissible distance so that it is possible to tension membrane 5. It is also worth considering the calculation of the location of tooth 12 relative to worm gear 23, so that the worm gear moves freely along tooth 12 to adjust the tension of membrane 5.

[0147] After assembling the body of the percussion instrument, I mount the spiral guides using any of the options presented, either by creating continuous threaded longitudinal holes, or by mounting continuous profiled grooves on the outer layer of the slats 2 or along the diameter of the inner rim 6.

[0148] Moreover, the inner rim 6 should be secured to the outer layer of slats 2 (body).

[0149] Next, select any of the proposed methods for assembling the membrane tensioning device (Fig. 9, Fig. 10, Fig. 12-Fig. 16).

[0150] Most of the connections, as noted earlier, are detachable, which improves production and repair (operational) efficiency. The worm gear elements 23 are installed at a previously calculated distance from the outer rim 3 and from the spiral guides 7.

[0151] The tension of membrane 5 is adjusted as follows.

[0152] Worm gear 23 is lowered onto tooth 12 by means of folding base 26 and is fixed by jumper 29.

[0153] Next, using the control element 25, the worm gear 23 is moved around its axis 24, thereby producing a gear transmission to the tooth 12.

[0154] The outer rim 3 starts to move, the pin 9 slides along one of the spiral guides 7, thereby implementing a screw transmission.

[0155] In this case, roller 10 exerts an axial load on the rim of membrane 4 and membrane 5 is tensioned.

[0156] The inventor created working models of the claimed devices. Compared to the prototype and similar devices, these devices were optimized for the percussion instrument's design, aimed at increasing the reliability of the body while simultaneously expanding the expressive capabilities of the instrument and, as additionally revealed, improving repairability. Experiments revealed improved operational manufacturability, specifically, a broader range of expressive coloring—reduced sustain, increased attack sharpness, and the ability to adjust the fundamental pitch over a wide range. Thus, the necessary rigidity of the body and membrane tensioning devices to ensure structural reliability was achieved through:

[0157] 1) the housing is made in the form of interconnected layers of slats, the slats of each layer are connected along the edge and directed at an angle of 10° to 45° relative to the vertical axis, wherein the angle of inclination of the next layer is oppositely directed relative to the previous one, the membrane tensioning device is made in the form of an outer rim 3 providing the possibility of fixing the rim of the membrane 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the possibility of movement of the outer rim 3 along the mentioned spiral guides 7.

[0158] 2) the membrane tensioning device is cut in the form of an outer rim 3 providing the possibility of fixing the membrane rim 4 and the possibility of tensioning the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, and in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the membrane rim 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the possibility of movement of the outer rim 3 along the mentioned spiral guides 7,

[0159] - wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in the recess of the outer rim 3, the other end of the pin 9 is located in one of the spiral guides 7. - wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in the recess of the outer rim 3, the other end of the pin 9 is located in one of the spiral guides 7, the roller 10 is mounted through a through connection in the upper part of the U-shaped outer rim 3, the tooth 12 is connected to the outer rim 3 through the rack 13.

[0160] - wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of the curved lower part of the outer rim 3, the size of which corresponds to ensuring the possibility of movement along the spiral guides 7, the tooth 12 is connected to the outer rim 3 through the rack 13.

[0161] - wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other at the end parts of the U-shaped rod 17 by a rigid connection, the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is rigidly installed in the recess of the large ring 16, the other end of the pin 9 is located in one of the spiral guides 7.

[0162] - wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other at the end parts of the L-shaped rod 17 by detachable sixth 21 and fourth 19 connections, respectively, the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in the recess of the large ring 16, the other end of the pin 9 is located in one of the spiral guides 7.

[0163] - wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other on the plate of the L-shaped rod 17 by detachable sixth 21 and fourth 19 connections, respectively, the screw connection of the spiral guides 7 with the outer rim 3 is made due to the detachable connection 22 of the pin 9 with the lower end edge of the large ring 16, and protruding.

[0164] Thus, the technical result is achieved, which consists in ensuring reliability and operational manufacturability by optimizing the design of the percussion musical instrument and the membrane tension devices, designed to expand the expressive capabilities of musical instruments.

Claims

FORMULA 1. A percussion musical instrument (drum) comprising a housing, a membrane tensioning device capable of transmitting an axial load to a membrane rim 4, providing for the tension of the membrane 5 on the housing, characterized in that the housing is made in the form of interconnected layers of slats, the slats of each layer are connected along the edge and directed at an angle of 10° to 45° relative to the vertical axis, wherein the angle of inclination of the next layer is oppositely directed relative to the previous one, the membrane tensioning device is made in the form of an outer rim 3 providing the ability to fix the rim of the membrane 4 and the ability to tension the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, and in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for fixing and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, a tooth 12 is mounted in the lower part of the outer rim 3,connected to a worm gear 23, the rotation of which enables the movement of the outer rim 3 along the mentioned spiral guides 7.

2. A percussion musical instrument (drum) according to claim 1, characterized in that the interconnected layers of slats are made in the form of two interconnected layers of slats, inner 1 and outer 2.

3. A percussion musical instrument (drum) according to paragraph 1, characterized in that the interconnected layers of slats are made in the form of four inner 1 and outer 2 layers of slats connected in pairs.

4. A percussion musical instrument (drum) according to paragraph 3, characterized in that, in order to reduce the weight of the structure, the inner pair of layers of slats is made in the form of two separate rings connected by an outer pair of layers of slats.

5. A percussion musical instrument (drum) according to paragraph 3, characterized in that the inner pair of layers of slats is extended relative to the outer pair of layers of slats.

6. A percussion musical instrument (drum) according to paragraph 1 and paragraph 3, characterized in that the slats of each layer, connected along the edge to each other, are connected to each other with an adhesive base.

7. A percussion musical instrument (drum) according to paragraph 1, characterized in that the layers of slats are connected to each other with an adhesive base.

8. A percussion musical instrument (drum) according to paragraph 1 and paragraph 3, characterized in that the thickness of each of the layers of the slats, internal 1 and external 2, is from 2 mm to 4 mm.

9. A percussion musical instrument (drum) according to item 6, characterized in that the thickness of the adhesive base is from 0.05 mm to 0.4 mm.

10. A percussion musical instrument (drum) according to claim 1, characterized in that the edge of the body has an additional bevel directed toward the central axis.

11. A membrane tensioning device made in the form of an outer rim 3 providing the ability to fix the rim of the membrane 4 and the ability to tension the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the ability to move the outer rim 3 along the mentioned spiral guides 7, wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in a recess of the outer rim 3, the other end of the pin 9 is located in one of the spiral guides 7.

12. A membrane tensioning device made in the form of an outer rim 3 providing the ability to fix the rim of the membrane 4 and the ability to tension the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the ability to move the outer rim 3 along the said spiral guides 7, wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in a recess of the outer rim 3, the other end of the pin 9 is located in one of the spiral guides 7, the roller 10 is mounted through a through connection in the upper part of the U-shaped outer rim 3,tooth 12 is connected to the outer rim 3 through rack 13., 13. A membrane tensioning device made in the form of an outer rim 3 providing the ability to fix the rim of the membrane 4 and the ability to tension the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the ability to move the outer rim 3 along the mentioned spiral guides 7, wherein the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a curved lower part of the outer rim 3, the size of which corresponds to providing the ability to move along the spiral guides 7, the tooth 12 is connected to the outer rim 3 through a rack 13.

14. A membrane tensioning device made in the form of an outer rim 3 providing the ability to fix the rim of the membrane 4 and the ability to tension the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for fixing and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the ability to move the outer rim 3 along the said spiral guides 7, wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other at the end parts of the U-shaped rod 17 by a rigid connection, the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of pin 9,one end of which is rigidly installed in the recess of the large ring 16, the other end of the pin 9 is located in one of the spiral guides 7., 15. A membrane tensioning device made in the form of an outer rim 3 providing the ability to fix the rim of the membrane 4 and the ability to tension the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the ability to move the outer rim 3 along the said spiral guides 7, wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other at the end parts of the L-shaped rod 17 by detachable sixth 21 and fourth 19 connections, respectively,the screw connection of the spiral guides 7 with the outer rim 3 is made with the help of a pin 9, one end of which is installed in the recess of the large ring 16, the other end of the pin 9 is located in one of the spiral guides 7.

16. A membrane tensioning device made in the form of an outer rim 3 providing the ability to fix the rim of the membrane 4 and the ability to tension the membrane 5 due to a screw connection with spiral guides 7 made along the diameter of the housing, wherein in the upper part of the outer rim 3 a roller 10 is mounted through a connection 11 for implementing fixation and transmitting vertical movement to the rim of the membrane 4 and, accordingly, adjusting the tension of the membrane 5, in the lower part of the outer rim 3 a tooth 12 is mounted, connected to a worm gear 23, the rotation of which provides the ability to move the outer rim 3 along the said spiral guides 7, wherein the upper part of the outer rim 3 is made in the form of a small ring 18, and the lower part of the outer rim 3 is made in the form of a large ring 16, both rings are connected to each other on the plate of an L-shaped rod 17 by detachable sixth 21 and fourth 19 connections, respectively,the screw connection of the spiral guides 7 with the outer rim 3 is made by means of a detachable connection 22 of the pin 9 with the lower end edge of the large ring 16, wherein the protruding end of the pin 9 is located in one of the spiral guides 7.

17. The membrane tensioning device according to paragraph 1, paragraphs 11-16, characterized in that the spiral guides 7 are made according to the diameter of the housing (Fig. 8).

18. The membrane tensioning device according to paragraph 1, paragraphs 11-16, characterized in that the spiral guides 7 are made according to the diameter of the inner rim 6, rigidly fixed to the housing.

19. The membrane tensioning device according to paragraph 17 and paragraph 18, characterized in that the spiral guides 7 are made in the form of continuous threaded longitudinal holes located parallel to each other.

20. The membrane tensioning device according to paragraph 17 and paragraph 18, characterized in that the spiral guides 7 are made of continuous profiled grooves.

Images