CN211604654U

CN211604654U - String tightness adjusting device

Info

Publication number: CN211604654U
Application number: CN201921576527.3U
Authority: CN
Inventors: 陆子天
Original assignee: Guangzhou Lava Information Technology Co ltd
Current assignee: Guangzhou Lava Information Technology Co ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-09-29
Anticipated expiration: 2029-09-20

Abstract

A string tightness adjusting device comprises a base, a rotating part, a winding part and a limiting part. The rotating piece comprises a worm and a rotating handle fixedly connected with the worm, the rolling piece comprises a rolling shaft and a worm wheel fixedly connected with the rolling shaft, the worm wheel is meshed with the worm, the base body forms a first hole and a second hole which are communicated, an internal thread is formed at one end, close to the outer surface of the base body, of the first hole, the worm is arranged in the first hole, the worm wheel is arranged in the second hole, the limiting piece forms an external thread, the limiting piece is sleeved on the worm and is screwed with the base body through the external thread and the internal thread to limit the displacement of the worm in the axial direction, and the rotating handle rotates to enable the worm to drive the worm wheel to rotate, so that the rolling shaft rotates to wind or loosen a string connected to the rolling shaft.

Description

String tightness adjusting device

Technical Field

The utility model relates to a stringed instrument, in particular to a string tightness adjusting device.

Background

Dazzling musical instruments such as guitar all include the device of adjusting string of a musical instrument elasticity, and the device includes swing handle, worm gear and scroll strip, and the worm is connected with the swing handle, and the worm gear is connected with the scroll strip, makes the worm rotate forward and reverse through rotatory swing handle to drive the worm gear positive direction and rotate, drive the scroll strip positive direction simultaneously and rotate, with the string of a musical instrument of coiling or relaxing, thereby the elasticity of adjustment string of a musical instrument. Although the device can position the rotating handle through the meshing of the worm and the gear, the worm and the gear cannot be completely attached during meshing, so that the rotating handle has a moving space in the axial direction of the worm, and the accuracy of string adjustment is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a string tightness adjusting device that improves the accuracy of string adjustment.

A string tightness adjusting device comprises a base body, a rotating piece and a coiling piece, wherein the rotating piece comprises a worm and a rotating handle fixedly connected with the worm, the coiling piece comprises a coiling shaft and a worm wheel fixedly connected with the coiling shaft, the worm wheel is meshed with the worm, the seat body forms a first hole and a second hole which are communicated with each other, an internal thread is formed at one end of the first hole close to the outer surface of the seat body, the worm is arranged in the first hole, the worm wheel is arranged in the second hole, the string tightness adjusting device further comprises a limiting piece, the limiting piece forms an external thread, is sleeved on the worm and is screwed with the base body through the external thread and the internal thread to limit the displacement of the worm in the axial direction, rotation of the handle causes the worm to drive rotation of the worm gear, thereby rotating the take-up shaft to wind or unwind a string attached to the take-up shaft.

The string tightness adjusting device limits the displacement of the worm in the axial direction by positioning the worm in the axial direction through the worm wheel and the limiting piece, and prevents the situation that the displacement is generated in the axial direction of the worm due to incomplete joint of the worm part and the worm wheel part to influence the string releasing of the coiling shaft, thereby improving the accuracy of string adjustment.

Drawings

Fig. 1 is a perspective view of an embodiment of a string tightness adjustment device.

Fig. 2 is an exploded view of the string tightness adjustment device of fig. 1.

Fig. 3 is an exploded view of the string tension adjustment apparatus of fig. 1 in another orientation.

Fig. 4 is a sectional view taken along the direction IV-IV in fig. 1.

Fig. 5 is a cross-sectional view taken in the direction V-V in fig. 1.

Description of the main elements

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

Referring to fig. 1 to 5, a string tightness adjusting device 100 includes a limiting member 10, a base 20, a rotating member 40, a winding member 60 and a positioning member 80. The positioning member 80 is fixed to the base body 20 and connected to the winding member 60 for fixing to the string head of the stringed musical instrument. The rotating member 40 and the reeling member 60 are installed on the base 20, and the rotating member 40 rotates to drive the reeling member 60 to rotate, so as to wind or unwind the string connected to the reeling member 60.

The base 20 has a first hole 21 and a second hole 22. The central axis of the first hole 21 is located on one side of the central axis of the second hole 22 and perpendicular to the central axis of the second hole 22. The base 20 includes a first side 23, a second side 24, a third side 25 and a fourth side 26 connected in sequence, the first side 23 is opposite to the third side 25, and the second side 24 is opposite to the fourth side 26. The first hole 21 extends from the first side 23 towards the third side 25 and ends before the third side 25. The second hole 22 extends from the second side 24 toward the fourth side 26 and terminates before the fourth side 26. The holder body 20 is formed with an internal thread 27 at an end of the first hole 21 adjacent to an outer surface of the holder body 20.

The winding member 60 includes a winding shaft 61, a worm wheel 62, a connecting member 65, and a stopper 66. The worm gear 62 is fixed in the second hole 22. The worm wheel 62 is formed with a non-circular fixing hole 63 such as a hexagonal hole. The winding shaft 61 includes a winding end 64 and a fixed end 67. The string winding end 64 is arranged outside the seat body 20 and used for winding the string. The fixed end 67 is disposed in the holder body 20. The fixing end 67 has a shape matching the shape of the fixing hole 63 and forms a coupling hole 70. The fixing end 67 is placed in the fixing hole 63, thereby restricting the displacement of the winding member 60 on the end surface of the worm wheel 62, so that the winding shaft 61 can rotate with the worm wheel 62.

The connecting member 65 includes a connecting portion 68 and a restricting portion 69 fixed to the connecting portion 68. The connecting portion 68 is fixed in the connecting hole 70, and the limiting portion 69 extends out of the fixed end 67 and abuts against the end surface of the worm wheel 62 away from the winding end 64, so as to limit the movement of the winding shaft 61 in the axial direction of the worm wheel 62. In one embodiment, the connecting member 65 is a screw, and the connecting hole 70 is a threaded hole. The outer surface of the fixed end 67 forms a step 71, and the limiting piece 66 is abutted between the step 71 and the worm wheel 62 to limit the position of the worm wheel 62 in the axial direction.

When the worm wheel 62 rotates, the winding shaft 61 fixed to the worm wheel 62 rotates with the worm wheel 62, and the connecting member 65 fixed to the winding shaft 61 rotates with the winding shaft 61, so that the worm wheel 62, the winding shaft 61, and the connecting member 65 rotate together.

The positioning member 80 includes a first sleeve 81 and a second sleeve 82. The first sleeve 81 is fitted over the winding shaft 61. An annular abutting portion 83 is disposed around an end of the first sleeve 81 away from the base 20. The holding portion 83 is for opposing a surface of a string head of the stringed musical instrument. A fixing pad 84 is sleeved on the first sleeve 81 and contacts with the abutting portion 83. The first sleeve 81 is threaded adjacent to the outer surface of the housing 20. The inner surface of the second sleeve 82 is formed with threads, and the second sleeve 82 is sleeved on the first sleeve 81 and fixed with the first sleeve 81 by screwing with each other. The second sleeve 82 includes a sleeve 85 and a shielding portion 86 protruding around one end of the sleeve 85. The shielding portion 86 shields the gap between the winding shaft 61 and the base 20 of the second hole 22 and is fixed to the base 20. In one embodiment, a plurality of through holes 87 are formed at the edge of the shielding portion 86, and a plurality of rivets are disposed in the plurality of through holes 87 and connected with the housing 20 to fix the second sleeve 82 on the housing 20. The end of the second sleeve 82 remote from the base 20 and the fixing pad 84 are used to hold the upper and lower surfaces of the string head of the stringed instrument to fix the winding member 60 to the string head.

The rotating member 40 includes a rotating handle 41, a worm 42, a first spacer 43 and a second spacer 44. The worm 42 includes a worm part 45, a connecting shaft 46 and a limiting shaft 47 at two ends of the worm part 45. The worm part 45 is disposed in the first hole 21 and engaged with the worm wheel 62, and the worm 42 rotates to drive the worm wheel 62 to rotate so as to wind or unwind the string connected to the take-up shaft 61. The end of the connecting shaft 46 remote from the worm part 45 is non-circular.

The first gasket 43 is sleeved on the limiting shaft 47 and located between the worm part 45 and the inner side of the seat body 20. The second spacer 44 is fitted over the connecting shaft 46 and contacts the worm part 45.

The limiting member 10 is annular, and is sleeved on the connecting shaft 46 and located between the worm part 45 and the rotating handle 41. An external thread 11 is formed on the outer surface of the limiting member 10, and the external thread 11 of the limiting member 10 is screwed with the internal thread 27 on the seat body 20, so that the first gasket 43 is abutted between the inner side of the seat body 20 and the worm part 45, and the second gasket 44 is abutted between the worm part 45 and the limiting member 10, thereby limiting the movement of the worm part 45 in the axial direction. In this way, when the worm wheel 62 is driven to rotate by the rotation of the rotary handle 41 via the worm rod part 45, the worm rod part 45 and the worm wheel 62 are not completely attached to each other, and displacement in the axial direction of the worm 42 is prevented, which affects the take-up shaft 61 to take up or release the string. Two opposite notches 12 are formed on the opposite end surfaces of the limiting member 10 and the rotating handle 41, and the two notches 12 are used for facilitating the screwing of the limiting member 10 in the seat body 20.

The rotary handle 41 is fixedly connected with the connecting shaft 46. When the knob 41 is operated to rotate, the worm 42 rotates with the knob 41. In one embodiment, the handle 41 forms a mounting hole 48, the shape of the mounting hole 48 is consistent with the shape of the end of the connecting shaft 46 away from the worm part 45 to fix the connecting shaft 46, and the mounting hole 48 is formed by two parallel rectangular surfaces 49 and two arc-shaped arc surfaces 50 connecting the two rectangular surfaces. In one embodiment, the connecting shaft 46 is secured in the mounting hole 48 by an interference fit.

In the string tightness adjusting device 100, the worm wheel 62 and the stopper 10 position the worm 42 in the axial direction of the worm 42, so that displacement of the worm 42 in the axial direction is restricted, and the string is prevented from being wound by the winding shaft 61 and being released by displacement of the worm 42 in the axial direction due to incomplete contact between the worm part 45 and the worm wheel part, thereby improving the accuracy of string adjustment.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the present invention as disclosed.

Claims

1. The utility model provides a string of thread elasticity adjusting device, includes the pedestal, rotates the piece and rolls up, rotate the piece including the worm and with worm fixed connection's swing handle, roll up the piece including roll up the axle and with roll up axle fixed connection's worm wheel, the worm wheel with the worm meshing, its characterized in that: the base body forms communicating first hole and second hole, the base body is close to in the first hole the one end of the surface of base body forms the internal thread, the worm is arranged in the first hole, the worm wheel is arranged in the second hole, string of thread elasticity adjusting device still includes the locating part, the locating part forms the external screw thread, the locating part overlap on the worm and with the base body pass through the external screw closes with the internal thread spiral shell closes in order to restrict the displacement of worm on the axial direction, the swing stem rotates and makes the worm drive the worm wheel rotates, thereby makes the take-up shaft rotate in order to wind or relax the string of thread that is connected on the take-up shaft.

2. A string tension adjusting device as defined in claim 1, wherein the worm comprises a worm part, a connecting shaft and a limiting shaft at two ends of the worm part, the connecting shaft is fixedly connected to the rotating handle, the limiting member is sleeved on the connecting shaft, the rotating member further comprises a first spacer, the first spacer is sleeved on the limiting shaft, and the limiting member supports the first spacer between the worm part and the inner side of the base.

3. A string tension adjustment apparatus as defined in claim 2, wherein said rotary member further comprises a second spacer, said second spacer being sleeved on said connection shaft, and said retaining member holding said second spacer against said worm part and said retaining member.

4. A string tension adjustment apparatus as defined in claim 2, wherein the end of the attachment shaft remote from the worm portion is non-circular, and the knob defines an attachment hole having a shape that conforms to the shape of the end of the attachment shaft remote from the worm portion to secure the attachment shaft.

5. A string tightness adjustment device as defined in claim 1, wherein the end surfaces of said retainer opposite said knob define two opposing notches.

6. A string tension adjusting device as defined in claim 1, wherein the take-up member further comprises a connecting member, the worm wheel is formed with a non-circular fixing hole, the take-up shaft comprises a take-up end and a fixing end, the take-up end is disposed outside the housing, the fixing end is shaped to match the shape of the fixing hole, the fixing end is disposed in the fixing hole and forms a connecting hole, the connecting member comprises a connecting portion and a restricting portion fixed to the connecting portion, the connecting portion is fixed in the connecting hole, and the restricting portion extends out of the fixing end and abuts against an end face of the worm wheel away from the take-up end.

7. A string tension adjustment apparatus as defined in claim 6, wherein said attachment means is a screw and said attachment holes are threaded holes.

8. A string tension adjustment apparatus as defined in claim 6, wherein said take-up member further comprises a stop tab, the outer surface of said fixed end defining a step, said stop tab abutting between said step and said worm gear.

9. A string tightness adjustment device as defined in claim 1, wherein said body includes first, second, third and fourth sides connected in series, said first and third sides being opposite one another, said second side being opposite said fourth side, said first hole extending from said first side toward said third side and terminating forward of said third side, said second hole extending from said second side toward said fourth side and terminating forward of said fourth side.

10. A string tension adjusting device according to claim 1, further comprising a positioning element, wherein the positioning element comprises a first sleeve and a second sleeve, the first sleeve is sleeved on the reeling shaft, an annular abutting portion is wound around an end of the first sleeve, which is away from the base, the second sleeve is sleeved on the first sleeve and fixed to the first sleeve, the second sleeve comprises a sleeve body and a shielding portion protruding from an end of the sleeve body, and the shielding portion shields the second hole from a gap between the reeling shaft and the base and is fixed to the base.