TWI895058B - A spring tension adjustment device for a pedal mechanism and a drum set treading mechanism thereof - Google Patents

Abstract

The present invention relates to a spring tension adjustment device for a pedal mechanism and a drum set treading mechanism thereof for assembling with a pedal. The pedal is trodden to beat a drum surface of a jazz drum. The spring tension adjustment device comprises a base, an adjustment member, a spring assembly, and an operating handle. A rotating shaft is pivoted with the base; the adjusting member is movably assembled in the base and is provided with a rotating rod portion and a spring assembling portion. One end of the spring assembly is connected to the rotating shaft; the other opposite end of the spring assembly is connected to the spring assembling portion. An inserting rod portion of the operating handle is connected between the rotating rod potion and a handle portion of the operating handle. Therefore, when the operating handle is rotated, the rotating rod portion will be rotated synchronously by the inserting rod portion, so that the spring assembling portion can move along an axis direction of the rotating rod portion to perform linear movement. When the spring assembling portion moves linearly relative to the rotating rod portion, the spring assembly will be changed from an original length to an adjustment length to adjust a spring tension of the spring assembly.

Description

Pedal spring tension adjustment device and drum pedal mechanism thereof

The present invention relates to a spring tension adjustment device for a pedal, particularly a pedal assembled to a jazz drum. The spring tension adjustment device not only drives the pedal to strike the drumhead of the jazz drum, but also has an operating handle for quickly adjusting the spring assembly to produce different spring tensions.

Jazz drums are an important percussion instrument in a band. Most jazz drums have a bass drum, a snare drum, a tom-tom, a floor tom, a hi-hat cymbal, a drum pedal, and cymbals. Cymbals can be divided into crash cymbals, ride cymbals, China cymbals, and splash cymbals.

Among them, the drum head of a jazz drum can be struck by stepping on the pedal of the hammer mechanism. When playing songs of different styles continuously, different striking forces are needed to strike the drum head to produce different timbres.

In addition, the swing amplitude of the drumstick can be controlled by adjusting different pedaling amplitudes. Different swing amplitudes will produce different striking forces. Among them, the striking force must be the same each time to ensure that the drumstick can only produce a single tone when hitting the drumhead.

However, the elastic member connected between the pedal and the drumstick can be stretched to produce different elastic tensions, and the elastic tension can control the swing amplitude of the drumstick, thereby producing a single swing tone by simply pressing the pedal.

Furthermore, common pedal mechanisms have an adjustment member assembled to a spring assembly, allowing the user to adjust the spring tension by rotating the adjustment member. However, the adjustment member is often located at the bottom of the pedal mechanism, close to the ground, forcing the user to bend or squat to reach the adjustment member for rotation, which is troublesome and time-consuming.

The main purpose of the present invention is to improve the structure of the spring tension adjustment device of the pedal so that the operating handle of the spring tension adjustment device is set above the pedal, so that the user can rotate the operating handle conveniently and quickly.

A secondary purpose of the present invention is to provide a positioning bracket for a spring tension adjustment device with a slotted hole and a graduated pattern, and to limit the spring tension to a length that matches the slotted hole, thereby enabling the spring tension to be directly read from the graduated pattern.

Another object of the present invention is to provide a spring assembly of the spring tension adjustment device with a quick-release portion. The user simply pulls the quick-release portion toward the base plate and then away from the spring. This allows the quick-release portion to be quickly removed from the positioning bracket, thereby providing the spring tension adjustment device with the technical feature of rapid disassembly and assembly.

Another object of the present invention is to configure the operating portion as a butterfly nut so that the butterfly nut forms a T-shaped structure. As a result, the butterfly nut can not only be quickly found by the user, but also increase the rotational force arm to reduce the force required by the user to rotate the operating handle.

Another object of the present invention is to enable the pulley to rotate as the spring positioning portion moves, thereby reducing friction loss generated when the pedal is stepped on.

To achieve the aforementioned objectives, the present invention provides a spring tension adjustment device for a pedal, which can be used in conjunction with a jazz drum, so that the spring tension adjustment device can be assembled with a footrest and a drumstick to form a jazz drum pedal mechanism. The spring tension adjustment device includes a positioning bracket, an adjustment member, a spring assembly, and an operating handle. The positioning bracket is connected to a rotating shaft, and the positioning bracket has an internal receiving channel.

The footrest has a pedal, a pivot and a transmission member connected between the pedal and the pivot, and the drumstick has a hammer head and a drumstick rod. The two opposite ends of the drumstick rod are respectively connected to the hammer head and the pivot of the footrest, so that the drumstick can be swung to move away from or closer to a drumhead of the jazz drum.

However, the adjusting piece is movably arranged on the positioning bracket and has a rotating shaft portion in the receiving channel and a spring positioning portion movably connected to the rotating shaft portion. The spring positioning portion includes a displacement end hidden in the positioning bracket and a connecting end extending to the outside of the positioning bracket. The adjusting piece further has a limiting pin connected to the spring positioning portion, and the positioning bracket further has a long slot hole connected to the receiving channel. The limiting pin can be movably accommodated in the long slot hole, so that the magnitude of the spring tension is limited to the length matching the long slot hole.

In addition, one end of the spring assembly is connected to the rotating shaft, and the other opposite end of the spring assembly is connected to the connecting end of the spring positioning portion. The spring assembly includes a rotating shaft connecting portion, a quick-release portion that can be quickly assembled and disassembled from the connecting end, and a spring connected between the rotating shaft connecting portion and the quick-release portion. The rotating shaft connecting portion includes a rotating block and a side-clamping rotating block assembled between the rotating block and the positioning bracket. The rotating block has an opening to provide a first end hook of the spring, so that the spring assembly is assembled to the rotating shaft.

The connecting end of the spring positioning portion has a freely rotatable pulley, so that a set hole of the quick release portion can cooperate and contact a rotating ring surface of the pulley, and the quick release portion includes an opening arranged above the set hole, which provides a hook for a second end of the spring, and a nut of the adjusting member is screwed to the connecting end of the spring positioning portion, so that the quick release portion is positioned between the nut and the pulley, and the spring assembly is assembled to the adjusting member.

However, the operating handle has a plug-in shaft inserted into the receiving channel and an operating portion at the top end of the outer side of the positioning bracket, and the plug-in shaft is connected between the rotating shaft and the operating portion, and the operating portion is configured as a butterfly nut, which has a gripping block that gradually expands from the spring assembly portion toward the plug-in shaft, so that the gripping block and the plug-in shaft form a T-shaped structure.

Furthermore, when the operating handle is rotated, the rotating shaft portion will be rotated synchronously with the plug-in shaft portion, so that the spring positioning portion can move linearly along an axial direction of the rotating shaft portion. When the spring positioning portion generates the linear movement relative to the rotating shaft portion, the spring assembly will be changed from an original length to an adjusted length, thereby adjusting the spring tension of the spring assembly. In addition, a scale pattern is provided around the long slot hole to indicate the size of the spring tension.

In addition, the rotating shaft is located at an extended position in the axial direction, so that the rotating shaft is perpendicular to the rotating shaft portion, and the plug-in shaft portion enters the receiving channel along a shaft direction, and the shaft direction is oblique to the axial direction.

The invention is characterized in that the spring tension adjustment device of the pedal is mainly composed of a positioning bracket, an adjustment member, a spring assembly and an operating handle, and the spring tension adjustment device can be assembled with a footrest and a drumstick to form a drumstick mechanism, so that the drumstick can be swung away from or close to the drumhead of the drum, wherein the positioning bracket is connected to a rotating shaft, and the positioning bracket has a receiving channel inside, and the adjustment member can be movably set on the positioning bracket. The adjusting member has a rotating shaft located in the receiving channel and a spring positioning portion movably connected to the rotating shaft. One end of the spring assembly is connected to the rotating shaft, and the other opposite end is connected to the connecting end of the spring positioning portion. The operating handle has a plug-in shaft inserted into the receiving channel and an operating portion located at the top end of the outer side of the positioning bracket. The plug-in shaft is connected between the rotating shaft and the operating portion. The connecting end of the spring positioning portion has a freely rotatable The rotating hanger allows the sleeve hole of the quick release part to cooperate with the rotating ring surface of the hanger. As a result, when the operating handle is rotated, the rotating shaft will be rotated synchronously with the plug-in shaft, so that the spring positioning part can move linearly along the axial direction of the rotating shaft. When the spring positioning part moves linearly relative to the rotating shaft, the spring assembly will be changed from the original length to the adjusted length, thereby adjusting the spring tension of the spring assembly. At the same time, the hanger can be The spring assembly rotates with the movement of the spring positioning portion, thereby reducing frictional wear and tear when the pedal is stepped on. Furthermore, the rotating shaft is positioned in an axially extended position, perpendicular to the rotating shaft. Furthermore, the plug-in shaft enters the receiving channel along the direction of the shaft, making the shaft direction oblique to the axial direction. Furthermore, the quick-release portion of the spring assembly can be quickly assembled and disassembled from the connection end, allowing the user to easily remove the spring assembly when storing the pedal.

In order to facilitate a deeper and more detailed understanding of the structure, use, and features of the present invention, a preferred embodiment is provided and described in detail with reference to the accompanying drawings as follows:

1, 2, 3 and 4, the spring tension adjustment device 1 of the pedal of the present invention is assembled on a drum pedal mechanism 2, and the drum pedal mechanism 2 also has a pedal seat 21, a rotating shaft 22 and a drumstick 30, wherein the pedal seat 21 has a pedal 211, a bottom plate 212, a heel plate 213, a pivot 214 and a transmission member 215 connected between the pedal 211 and the pivot 214, and the heel plate 213 is connected to the drum pedal 211. Between the pedal 211 and the base plate 212, the pedal 211 is arranged above the base plate 212, and the pivoting portion 214 has a through slot 216 and a rotating wheel 217 arranged on one side of the through slot 216. The through slot 216 provides the drumstick 30 for insertion, and the transmission member 215 is assembled between the rotating wheel 217 and the pedal 211. In addition, the component material of the transmission member 215 is not limited, and the transmission member 215 can be a chain or a belt.

1, 2, 3 and 6, the shaft 22 has a seat 221, a plurality of bearings 222, a pressure plate 223 and a first screw 224. In addition, the drumstick 30 has a hammer head 31 and a drumstick 32. A jazz drum has a drumhead. The hammer head 31 has a striking surface 33 that can contact the drumhead. The opposite ends of the drumstick 32 are respectively inserted into the through slot 216 of the pivot portion 214 and the through slot 217 of the pivot portion 214. A mounting space 34 of the hammer head 31 allows the two opposite ends of the drumstick 32 to be respectively assembled to the hammer head 31 and the pivot portion 214 of the footrest 21. Therefore, when a user steps on the pedal 211, the pedal 211 will be swung to approach the base plate 212. At the same time, the pedal 211 will drive the transmission member 215, so that the drumstick 30 assembled to the pivot portion 214 will be swung away from or closer to the drumhead of the jazz drum.

1, 2, 3, 4, 5 and 6, the spring tension adjustment device 1 includes a positioning bracket 40, an adjustment member 50, a spring assembly 60 and an operating handle 70. The positioning bracket 40 has a plug-in slot 41, a through-hole 42 adjacent to the plug-in slot 41, a receiving channel 43, a long slot 44, a long through-hole 45 and a scale pattern 46 adjacent to the long slot 44. The plug-in slot 41 and the through-hole 42 are jointly provided at the top of the positioning bracket 40, and the plug-in slot 41 provides the shaft 22 for insertion, and the positioning bracket 40 has a plurality of holes. The interior has the receiving channel 43, which has a first sliding section 431, a second sliding section 432 and a third sliding section 433 arranged between the first sliding section 431 and the second sliding section 432, and the diameter of the third sliding section 433 is not only larger than the diameter of the first sliding section 431, but also larger than the diameter of the second sliding section 432. In addition, the long slot 44 is connected to the receiving channel 43, and the long through hole 45 is also connected to the receiving channel 43. Moreover, the component material of the positioning bracket 40 is not limited, and the positioning bracket 40 can be an aluminum metal material.

Please continue to refer to Figures 1, 2, 3, 4, 5 and 6. The adjusting member 50 can be movably arranged on the positioning bracket 40. In this embodiment, the adjusting member 50 has a rotating shaft 51, a spring positioning portion 52, a universal joint 53 and a limiting pin 54. The rotating shaft 51 is arranged in the second sliding section 432 of the receiving channel 43 and has a recessed hole 511 and an external thread 512 adjacent to the recessed hole 511. The spring positioning portion 52 is movably connected to the rotating shaft 51. The spring positioning portion 52 includes a displacement end 521 hidden in the positioning bracket 40 and a connection end 522 connected to the displacement end 521. The positioning portion 52 and the universal joint 53 are both arranged in the third sliding section 433 of the receiving channel 43. The displacement end 521 has a plurality of circular holes 523, so that the rotating shaft portion 51 and the limiting pin 54 can be respectively inserted into the plurality of circular holes 523, so that the limiting pin 54 is connected to one side of the spring positioning portion 52, so that the rotating shaft portion 51 can be perpendicular to the limiting pin 54. At the same time, the connecting end 522 will pass through the outside of the positioning bracket 40, wherein the connecting end 522 of the spring positioning portion 52 has a freely rotatable hanging wheel 524 and a nut 525. In addition, the interior of the spring positioning portion 52 has an internal thread 526 that is screwed to the external thread 512 of the rotating shaft portion 51.

Please continue to refer to Figures 1, 2, 3, 4, 5 and 6. The spring assembly 60 includes a shaft connection portion 61, a quick release portion 62 and a spring 63. In this embodiment, the shaft connection portion 61 includes a rotating block 611, a second screw 612, a side clamp rotating block 613, a square head screw 614 and a plurality of washers 615. The second screw 612 is assembled to one side of the rotating block 611 and the first screw 224 is assembled to the The pressure plate 223 allows the pressure plate 223, the multiple bearings 222, and the spacer 221 to be assembled in the insertion slot 41, so that the rotating shaft 22 can be connected to the positioning bracket 40. At the same time, the side clamp rotating block 613 is positioned between the positioning bracket 40 and the rotating block 611, and the square head screw 614 is screwed to the side clamp rotating block 613, so that the multiple gaskets 615 are positioned between the square head screw 614 and the side clamp rotating block 613.

Continuing to refer to Figures 1, 2, 3, 4, 5, and 6, the quick-release portion 62 has a sleeve hole 621 and an opening 622 disposed above the sleeve hole 621. The diameter of the sleeve hole 621 is larger than the diameter of the opening 622. The sleeve hole 621 can cooperate with a rotating annular surface 527 of the hanging wheel 524, and the outer periphery of the sleeve hole 621 is larger than the outer periphery of the rotating annular surface 527, so that the hanging wheel 524 is restricted from rotating within the sleeve hole 621.

Please continue to refer to Figures 2, 3, 4, 5, 6, 7 and 8. In this embodiment, the two opposite sides of the spring 63 have a first end 631 and a second end 632, and a deformation section 633 of the spring 63 is disposed between the first end 631 and the second end 632. The first end 631 is configured with a first hook 634 and the second end 632 is configured with a second hook 635. The first hook 634 can be hooked on an opening 616 of the rotating block 611, so that the spring 63 can be assembled with the shaft connecting portion 61. , and then the spring assembly 60 is assembled to the shaft 22, and the second hook 635 can be hooked into the opening 622 of the quick-release portion 62, and the nut 525 of the adjusting member 50 can be screwed to the connecting end 522 of the spring positioning portion 52, so that the quick-release portion 62 is positioned between the nut 525 and the hanging wheel 524, and then the spring assembly 60 is assembled to the adjusting member 50, thereby, one end of the spring assembly 60 is connected to the shaft 22, and the other opposite end of the spring assembly 60 is connected to the connecting end 522 of the spring positioning portion 52.

1, 2, 3, 4, 5 and 6, the operating handle 70 has a plug-in shaft 71 inserted into the receiving channel 43 and an operating portion 72 at the top end of the outer side of the positioning bracket 40, and the two opposite ends of the plug-in shaft 71 are respectively assembled with the universal joint 53 and the operating portion 72, so that the plug-in shaft 71 is connected between the rotating shaft 51 and the operating portion 72. In this embodiment, the The operating portion 72 is configured as a butterfly nut 73, which has a gripping block 74 that gradually expands from the spring assembly 60 toward the plug-in shaft portion 71, so that the gripping block 74 and the plug-in shaft portion 71 form a T-shaped structure 75. The T-shaped structure 75 of the butterfly nut 73 can not only be quickly found by the user, but also increase a rotational force arm of the operating portion 72 to reduce the force required to rotate the operating handle 70.

Please refer to Figures 2, 3, 4, 5, 6, 7 and 8. When the operating handle 70 is rotated, the plug-in shaft 71 rotates in the first sliding section 431 in the receiving channel 43. The plug-in shaft 71 can drive the rotating shaft 51 to rotate through the universal joint 53, so that the rotating shaft 51 will be rotated synchronously with the plug-in shaft 71, allowing the spring positioning portion 52 to rotate along the rotating shaft. 51 to perform a linear movement 80, and at the same time, the hanging wheel 524 and the quick release portion 62 will also perform the linear movement 80 along the axial direction D1, so that the spring 63 will perform the linear movement 80 along the axial direction D1, thereby the hanging wheel 524 and the quick release portion 62 can reduce the friction generated when the pedal 211 is swung, and when the spring positioning portion 52 is relative to the rotating shaft 51 When the linear movement 80 is generated, the spring assembly 60 is changed from an original length L1 to an adjusted length L2, thereby adjusting a spring tension of the spring assembly 60. The scale pattern 46 around the long slot 44 can match the spring tension, and the limit pin 54 can be movably received in the long slot 44, so that the size of the spring tension is limited to the length matching the long slot 44. Thus, the user only needs to adjust the length of the long slot 44. By comparing the position of the limiting pin 54 in the long slot 44 with the scale pattern 46, the spring tension can be quickly determined. Furthermore, the rotating shaft 22 is located at an extended position S1 in the axial direction D1, so that the rotating shaft 22 is perpendicular to the rotating shaft portion 51, and the plug-in shaft portion 71 enters the first sliding section 431 of the receiving channel 43 along an axial direction D2, and the axial direction D2 is oblique to the axial direction D1.

1 , 3 , and 8 , when the user wants to store the drumstick mechanism 2, the user must detach the spring assembly 60 from the positioning bracket 40 . To do this, the user only needs to first pull the quick-release portion 62 toward the base plate 212 to move the hole 621 of the quick-release portion 62 away from the pulley 524 . The user then moves the second hook 635 of the spring 63 out of the opening 622 of the quick-release portion 62 to move the opening 622 of the quick-release portion 62 away from the second end 632 of the spring 63 . This allows the quick-release portion 62 to be quickly assembled and detached from the connecting end 522 of the spring positioning portion 52 .

1: Spring Tension Adjustment Device 2: Hammer Mechanism 21: Footrest 211: Pedal 212: Base 213: Heel Plate 214: Pivot 215: Transmission 216: Through Slot 217: Rotating Wheel 22: Rotating Shaft 221: Intermediate Seat 222: Bearing 223: Pressure Plate 224: First Screw 30: Drumstick 31: Hammer Head 32: Drumstick Rod 33: Striking Surface 34: Mounting Space 40: Positioning Bracket 41: Socket 42: Through Hole 43: Receiving Channel 431: First Sliding Segment 432: Second Sliding Segment 433: Third Sliding Segment 44: Long Slot 45: Long through hole 46: Scale pattern 50: Adjustment element 51: Rotating shaft 511: Recessed hole 512: External thread 52: Spring retaining element 521: Displacement end 522: Connection end 523: Round hole 524: Pulley 525: Nut 526: Internal thread 527: Rotating ring 53: Universal joint 54: Stop pin 60: Spring assembly 61: Rotating shaft connection 611: Rotating block 612: Second screw 613: Side clamping rotating block 614: Square-head screw 615: Washer 616: Opening 62: Quick-release section 621: Hole 622: Opening 63: Spring 631: First end 632: Second end 633: Deformation section 634: First hook 635: Second hook 70: Operating handle 71: Connecting shaft 72: Operating section 73: Butterfly nut 74: Grip 75: T-shaped structure 80: Linear movement D1: Axial direction D2: Shaft direction L1: Initial length L2: Adjustable length S1: Extended position

Figure 1 is a perspective view of the spring tension adjustment device of the pedal of the present invention assembled on the hammer mechanism of a jazz drum; Figure 2 is a schematic diagram of the spring tension adjustment device of the pedal of the present invention; Figure 3 is a left-side view of the spring tension adjustment device of the pedal of the present invention; Figure 4 is a right-side view of the spring tension adjustment device of the pedal of the present invention; Figure 5 is a cross-sectional view of the spring tension adjustment device of the pedal of the present invention; Figure 6 is an exploded view of the spring tension adjustment device of the pedal of the present invention; Figure 7 is a schematic diagram of the spring positioning portion moving linearly to change the length of the spring assembly; and Figure 8 is a schematic diagram of the quick-release portion moving away from the spring positioning portion.

1: Spring tension adjustment device

22: Axis

40: Positioning bracket

44: Long slot hole

45: Long through hole

46: Scale pattern

50: Adjustment piece

52: Spring positioning part

525: Nut

54: Limit pin

60: Spring assembly

61: Shaft connection

611: Rotating Block

612: Second screw

613: Side clip pivot block

614: Square head screw

616: Opening

62: Quick Release

622: Opening

63: Spring

631: First End

632: Second End

633: Deformation segment

634: First Hook

635: Second Hook

70: Operating handle

72: Operation Department

S1: Extended position

Claims (10)

A pedal spring tension adjustment device comprises: A positioning bracket connected to a rotating shaft and having an internal receiving channel; An adjustment member movably mounted on the positioning bracket, comprising a rotating shaft portion positioned in the receiving channel and a spring positioning portion movably connected to the rotating shaft portion, the spring positioning portion including a displacement end concealed within the positioning bracket and a connection end extending outside the positioning bracket; A spring assembly having one end connected to the rotating shaft and an opposite end connected to the connection end of the spring positioning portion; An operating handle having a plug-in shaft portion inserted into the receiving channel and an operating portion located at the top end outside the positioning bracket, the plug-in shaft portion being connected between the rotating shaft portion and the operating portion; When the operating handle is rotated, the rotating shaft is rotated synchronously with the plug-in shaft, allowing the spring positioning portion to move linearly along the axial direction of the rotating shaft. Furthermore, when the spring positioning portion moves linearly relative to the rotating shaft, the spring assembly changes from an original length to an adjusted length, thereby adjusting the spring tension of the spring assembly. A spring tension adjustment device for a pedal as described in claim 1, wherein the rotating shaft is located at an extended position in the axial direction, so that the rotating shaft is perpendicular to the rotating shaft, and the plug-in shaft enters the receiving channel along an axis direction, and the axis direction is oblique to the axial direction. A spring tension adjustment device for a pedal as described in claim 1, wherein the adjustment member further has a limit pin connected to the spring positioning portion, and the positioning bracket further has a long slot hole connected to the receiving channel, and the limit pin can be movably accommodated in the long slot hole, so that the magnitude of the spring tension is limited to a length that matches the length of the long slot hole. A spring tension adjustment device for a pedal as described in claim 3, wherein a scale pattern is provided around the long slot hole to indicate the size of the spring tension. A spring tension adjustment device for a pedal as described in claim 1, wherein the spring assembly includes a rotating shaft connection portion, a quick-release portion that can be quickly assembled and disassembled at the connection end, and a spring connected between the rotating shaft connection portion and the quick-release portion. A spring tension adjustment device for a pedal as described in claim 5, wherein the shaft connection portion includes a rotating block and a side-clamping rotating block assembled between the rotating block and the positioning bracket, and the rotating block has an opening to provide a first end hook of the spring so that the spring assembly is assembled on the shaft. A spring tension adjustment device for a pedal as described in claim 5, wherein the connecting end of the spring positioning portion has a freely rotatable hanging wheel, so that a set of holes in the quick-release portion can cooperate with a rotating ring surface of the hanging wheel. A spring tension adjustment device for a pedal as described in claim 7, wherein the quick-release portion includes an opening arranged above the sleeve hole, the opening provides a second end hook of the spring, and a nut of the adjustment member is screwed to the connecting end of the spring positioning portion, so that the quick-release portion is positioned between the nut and the hanging wheel, and then the spring assembly is assembled to the adjustment member. A spring tension adjustment device for a pedal as described in claim 1, wherein the operating portion is configured as a butterfly nut, and the butterfly nut has a gripping block that gradually expands from the spring assembly portion toward the plug-in shaft portion, so that the gripping block and the plug-in shaft portion form a T-shaped structure. A drumstick mechanism comprises: A footrest having a pedal, a pivot, and a transmission member connected between the pedal and the pivot; A drumstick having a head and a stick, with opposite ends of the stick connected to the head and the pivot of the footrest, respectively, so that the drumstick can be swung away from or closer to a drumhead of a drum; and A spring tension adjustment device is assembled to the pivot portion of the pedal seat and includes a positioning bracket, an adjustment member, a spring assembly, and an operating handle. The positioning bracket is connected to a rotating shaft. The interior of the positioning bracket has a receiving channel. The adjustment member is movably arranged on the positioning bracket. The adjustment member has a rotating shaft located in the receiving channel and a spring positioning portion movably connected to the rotating shaft. The spring positioning The spring assembly includes a displacement end concealed within the positioning bracket and a connection end extending outside the positioning bracket. One end of the spring assembly is connected to the rotating shaft, and the other opposite end of the spring assembly is connected to the connection end of the spring positioning portion. The operating handle includes a plug-in shaft inserted into the receiving channel and an operating portion located at the top end of the outer side of the positioning bracket. The plug-in shaft is connected between the rotating shaft and the operating portion. When the operating handle is rotated, the rotating shaft is rotated synchronously with the plug-in shaft, allowing the spring positioning portion to move linearly along the axial direction of the rotating shaft. Furthermore, when the spring positioning portion moves linearly relative to the rotating shaft, the spring assembly changes from an original length to an adjusted length, thereby adjusting the spring tension of the spring assembly.