Piano trundle
The piano caster design addresses the issue of stability and shock absorption by incorporating a pivoting wheel assembly with a horizontal spring mechanism, ensuring both effective shock absorption and rigid connection, thereby enhancing the stability and shock absorption of the piano.
Patent Information
- Application Number
- CN202422434699.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-08
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-10-08
AI Technical Summary
The existing piano casters reduce the stability of the piano while damping, and cannot provide hard connections, resulting in insufficient stability of the piano.
Using a transversely mounted elastic device, the roller is connected to the support rod through a movable bracket, which uses the lever principle to provide cushioning when moving, and achieves a hard connection when stopping. The preloading force is adjusted in combination with the cushioning pad and the spring mechanism to ensure the stability of the piano and the caster.
Provides effective cushioning and shock absorption during movement, ensuring hard connections when stopped, improving the stability and safety of the piano.
Smart Images
Figure CN223100367U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of piano accessories, and particularly relates to a piano caster. Background Art
[0002] Currently, a piano moving caster with a shock-absorbing function is disclosed, which includes a device body. A roller is movably sleeved on the surface of the device body. A fixed block is fixedly installed at the top end of the device body. A movable shaft rod is movably sleeved on the surface of the device body. A telescopic damping rod is detachably installed at the top end of the fixed block. A telescopic spring is inlaid on the top surface of the fixed block. The top end of the telescopic damping rod is fixedly installed with a connecting block. A threaded hole is opened on the top surface of the connecting block. A limiting plate is detachably installed on the surface of the connecting block. A locking bolt is threadedly installed on the surface of the limiting plate. In the above solution, by setting the telescopic damping rod, the telescopic spring and the limiting plate, and using the mutual cooperation of the three, when the device is in use, the vibration is transmitted to the inside of the telescopic spring through the roller and the fixed block. At the same time, the vibration is also transmitted to the inside of the telescopic damping rod, thereby driving the telescopic damping rod and the telescopic spring to be compressed and subsequently stretched, so as to shock-absorb the whole piano. Although this caster can achieve the shock-absorbing effect, there are the following problems. Since the telescopic spring and the telescopic damping rod are connected to the bottom of the piano in a vertically arranged manner, while achieving shock absorption, the rigidity is reduced, the stability of the piano is reduced, and a stable placement environment cannot be provided for the internal movement and other components.
[0003] There is also a disclosed piano moving caster with a shock-absorbing function, which includes a mounting bottom tube. A limiting ring is rotatably connected to the outside of the mounting bottom tube. A mounting sleeve is fixedly connected to the outside of the limiting ring. A limiting block is slidably connected to the inside of the mounting sleeve. The other end of the limiting block is fixedly connected with a threaded sleeve. A threaded rod is spirally connected to the inside of the threaded sleeve. The top end of the threaded rod is fixedly connected with a piano bottom plate. The bottom end of the threaded rod is fixedly connected with a buffer block. A spring is fixedly connected to the bottom end of the buffer block. This structure also uses a vertically distributed spring to achieve buffering, resulting in the connection between the roller of the caster and the piano through the spring. Although buffering can be achieved, the stability of the piano is insufficient. Summary of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide a piano caster that laterally installs an elastic device, enables the roller to have a certain amplitude of swing during movement, and can achieve a rigid connection after stopping, and can ensure that both the piano and the caster have buffering and rigid connection.
[0005] The technical solution of the utility model is to provide a piano caster with the following structure, including a roller, a caster bracket, and a connecting shaft assembly, wherein the connecting shaft assembly is installed on the top of the caster bracket and is perpendicular to the top plate of the caster bracket; the bottom of the connecting shaft assembly is rotatably connected to the top plate of the caster bracket, and is characterized in that: it also includes a movable bracket, the roller is installed at the bottom of the movable bracket, the middle part of the movable bracket is rotatably connected to the caster bracket, the top of the movable bracket is embedded between the two side plates of the caster bracket, the two side plates of the caster bracket are provided with support rods, one side of the caster bracket protrudes outward and is provided with a positioning plate, the positioning plate is provided with a spring mechanism in the horizontal direction, one end of the spring mechanism is connected to the positioning plate, and the other end is against the top of the movable bracket, and the side wall of the movable bracket is pushed to always be against the support rod.
[0006] A supporting structure is provided on the top of the movable bracket, and the supporting structure includes a fixed block and a buffer pad. The top of the movable bracket is higher than the support rod, the fixed block is fixed on the top of the movable bracket, and the buffer pad is detachably installed on the fixed block, and the side of the buffer pad contacts the outer wall of the support rod.
[0007] The support rod movable sleeve has a shaft sleeve, and when subjected to force, the shaft sleeve is stationary or rotates around the support rod.
[0008] A groove is arranged on the side of the buffer pad, and the shaft sleeve is embedded in the groove.
[0009] The spring mechanism includes a spring, a positioning plate, a screw, and a lever. The positioning plate is located on the inner side of the positioning plate. The screw passes through the threaded hole of the positioning plate. The positioning plate is fixed to the inner end of the screw. One end of the spring is connected to the side wall of the movable bracket, and the other end is connected to the positioning plate. The lever passes horizontally through the screw extending out of the positioning plate. The lever is perpendicular to the screw. Rotating the lever causes the screw to rotate and adjust the distance extended into the positioning plate, which is used to adjust the preload force of the spring.
[0010] The buffer pad protrudes from the beveled edge of the side of the movable bracket, so that the buffer pad abuts against the shaft sleeve.
[0011] The connecting shaft assembly comprises a connecting shaft and a bearing. The bearing is fixed to the top plate of the caster bracket, and the bottom of the connecting shaft is fixed to the top of the bearing. After installation, the caster bracket rotates freely around the connecting shaft.
[0012] After adopting the above structure, the utility model has the following advantages: adding a movable bracket, installing the roller at the bottom of the movable bracket, the middle part of the movable bracket is rotatably connected to the caster bracket, the top of the movable bracket is embedded between the two side plates of the caster bracket, the movable bracket actually uses the lever principle, and one end connected to the roller is a power arm. The two side plates of the caster bracket are provided with support rods, one side of the caster bracket protrudes outward and is provided with a positioning plate, and the positioning plate is provided with a spring mechanism along the horizontal direction, one end of the spring mechanism is connected to the positioning plate, and the other end is against the top of the movable bracket, and the side wall of the movable bracket is pushed to always be against the support rod, and this side of the movable bracket is the resistance arm of the lever. After being supported by the spring, in the process of the roller moving, once encountering a large fluctuation, the roller connected to the movable bracket can squeeze the spring and swing up, thereby reducing the impact force, increasing the buffering effect of the caster, and can achieve a hard connection after stopping, which can ensure that the piano and the caster have both buffering and hard connection.
[0013] As an improvement, a supporting structure is provided on the top of the movable bracket, and the supporting structure includes a fixed block and a buffer pad. The top of the movable bracket is higher than the support rod, and the fixed block is fixed on the top of the movable bracket. The buffer pad is detachably installed on the fixed block, and the side of the buffer pad is in contact with the outer wall of the support rod, so that the supporting structure has a protective and shock-absorbing effect and reduces the impact force.
[0014] As an improvement, the support rod movable sleeve has a shaft sleeve. When subjected to force, the shaft sleeve is stationary or rotates around the support rod, and the shaft sleeve can protect the shaft.
[0015] As an improvement, a groove is provided on the side of the buffer pad, and the shaft sleeve is embedded in the groove, so that the buffer pad can increase the positioning performance of the shaft.
[0016] As an improvement, the spring mechanism includes a spring, a positioning plate, a screw, and a lever. The positioning plate is located on the inner side of the positioning plate. The screw passes through the threaded hole of the positioning plate. The positioning plate is fixed to the inner end of the screw. One end of the spring is connected to the side wall of the movable bracket, and the other end is connected to the positioning plate. The lever passes horizontally through the screw extending out of the positioning plate. The lever is perpendicular to the screw. Rotating the lever causes the screw to rotate and adjust the distance extended into the positioning plate. It is used to adjust the preload force of the spring. It has good reliability and is adjustable.
[0017] As an improvement, the buffer pad protrudes from the beveled edge of the side of the movable bracket so that the buffer pad abuts against the shaft sleeve, thereby increasing reliability.
[0018] As an improvement, the connecting shaft assembly includes a connecting shaft and a bearing. The bearing is fixed to the top plate of the caster bracket, and the bottom of the connecting shaft is fixed to the top of the bearing. After installation, the caster bracket rotates freely around the connecting shaft, allowing the caster to rotate flexibly. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a three-dimensional schematic diagram of the piano caster of the present utility model.
[0020] Figure 2 This is an internal schematic diagram of the piano caster of the present utility model.
[0021] Figure 3 This is a sectional schematic diagram of the piano caster of the present utility model.
[0022] Figure 4 This is a cross-sectional schematic diagram of the piano caster of the present utility model.
[0023] Figure 5 This is an exploded schematic diagram of the piano caster of the present utility model.
[0024] Figure 6 This is a schematic diagram of the spring mechanism of the present utility model.
[0025] As shown in the figure:
[0026] 1. Roller, 2. Caster bracket, 3. Connecting shaft assembly, 4. Top plate, 5. Movable bracket, 6. Support rod, 7. Positioning plate, 8. Fixed block, 9. Buffer pad, 10. Groove, 11. Spring, 12. Positioning disc, 13. Screw, 14. Lever, 15. Connecting shaft, 16. Bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] The present utility model will be further described below with reference to the accompanying drawings.
[0028] As Figure 1-6 shown, a piano caster of the present utility model includes a roller 1, a caster bracket 2, and a connecting shaft assembly 3. The connecting shaft assembly 3 is installed on the top of the caster bracket 2 and is perpendicular to the top plate 4 of the caster bracket 2; the bottom of the connecting shaft assembly 3 is rotatably connected to the top plate 4 of the caster bracket 2.
[0029] A piano caster of the present utility model further includes a movable bracket 5. The roller 1 is installed at the bottom of the movable bracket 5. The bottom of the movable bracket 5 has two side walls, and the roller 1 is rotated by being embedded between the two side walls through a rotating shaft.
[0030] The middle part of the movable bracket 5 is rotatably connected to the caster bracket 2. The top of the movable bracket 5 is embedded between the two side plates of the caster bracket 2. The two side plates of the caster bracket 2 are provided with support rods 6. One side of the caster bracket 2 protrudes outward and is provided with a positioning plate 7. The positioning plate 7 is provided with a spring mechanism in the horizontal direction. One end of the spring mechanism is connected to the positioning plate 7, and the other end abuts against the top of the movable bracket 5 and pushes the side wall of the movable bracket 5 to always abut against the support rod 6.
[0031] As Figure 2 and Figure 3 shown, a support structure is provided at the top of the movable bracket 5. The support structure includes a fixing block 8 and a buffer pad 9. The top of the movable bracket 5 is higher than the support rod 6. The fixing block 8 is fixed to the top of the movable bracket 5. The buffer pad 9 is detachably mounted on the fixing block 8. The side surface of the buffer pad 9 contacts the outer wall of the support rod 6.
[0032] A bushing (not shown in the figure) is movably sleeved on the support rod 6. When a force is applied, the bushing remains stationary or rotates around the support rod 6, playing a role in protecting the support rod 6.
[0033] As Figure 3 shown, a groove 10 is provided on the side surface of the buffer pad 9. The bushing is embedded in the groove 10. The buffer pad 9 can be replaced.
[0034] As Figure 1 , Figure 3 and Figure 6 shown, the spring mechanism includes a spring 11, a positioning disc 12, a screw 13, and a lever 14. Here, the spring 11 is a compression spring that provides a thrust force after being compressed. The positioning disc 12 is located inside the positioning plate 7. The screw 13 passes through the threaded hole of the positioning plate 7. The positioning disc 12 is fixed to the inner end of the screw 13. One end of the spring 11 is connected to the side wall of the movable bracket 5, and the other end is connected to the positioning disc 12. The lever 14 passes horizontally through the screw 13 protruding from the positioning plate 7. The lever 14 is perpendicular to the screw 13. By rotating the lever 14, the screw 13 rotates and the distance extending into the positioning plate 7 is adjusted to adjust the pre-tightening force of the spring 11. The conventional adjustment method: clockwise is for inward adjustment, and counterclockwise is for outward adjustment. When adjusting, rotate the lever 14.
[0035] The buffer pad 9 protrudes from the hypotenuse of the side surface of the movable bracket 5, so that the buffer pad 9 abuts against the bushing.
[0036] The connecting shaft assembly 3 includes a connecting shaft 15 and a bearing 16. The bearing 16 is fixed to the top plate of the caster bracket 2. The bottom of the connecting shaft 15 is fixed to the top of the bearing 16. After installation, the caster bracket 2 rotates freely around the connecting shaft 15. The connecting shaft 15 is embedded in the bottom mounting hole of the piano.
Claims
1. A piano caster, comprising a roller (1), a caster bracket (2), and a connecting shaft assembly (3). The connecting shaft assembly (3) is installed at the top of the caster bracket (2) and is perpendicular to the top plate (4) of the caster bracket (2). The bottom of the connecting shaft assembly (3) is rotatably connected to the top plate (4) of the caster bracket (2), and is characterized in that: It further includes a movable bracket (5), the roller (1) is installed at the bottom of the movable bracket (5), the middle part of the movable bracket (5) is rotatably connected to the caster bracket (2), the top of the movable bracket (5) is embedded between the side plates on both sides of the caster bracket (2), the side plates on both sides of the caster bracket (2) are provided with support rods (6), one side of the caster bracket (2) protrudes outward and is provided with a positioning plate (7), a spring mechanism is arranged on the positioning plate (7) along the horizontal direction, one end of the spring mechanism is connected to the positioning plate (7), and the other end abuts against the top of the movable bracket (5), and pushes the side wall of the movable bracket (5) to always abut against the support rod (6).
2. The piano caster according to claim 1, characterized in that: The top of the movable bracket (5) is provided with a support structure, the support structure includes a fixed block (8) and a buffer pad (9), the top of the movable bracket (5) is higher than the support rod (6), the fixed block (8) is fixed on the top of the movable bracket (5), the buffer pad (9) is detachably installed on the fixed block (8), and the side surface of the buffer pad (9) is in contact with the outer wall of the support rod (6).
3. A piano caster according to claim 1 or 2, characterized in that: The support rod (6) is movably sleeved with a bushing, and when stressed, the bushing is stationary or rotates around the support rod (6).
4. The piano caster according to claim 3, characterized in that: The spring mechanism includes a spring (11), a positioning disk (12), a screw rod (13), and a lever (14). The positioning disk (12) is located inside the positioning plate (7). The screw rod (13) penetrates through the threaded hole of the positioning plate (7). The positioning disk (12) is fixed to the inner end of the screw rod (13). One end of the spring (11) is connected to the side wall of the movable bracket (5), and the other end is connected to the positioning disk (12). The lever (14) horizontally passes through the screw rod (13) protruding out of the positioning plate (7). The lever (14) is perpendicular to the screw rod (13). Rotating the lever (14) makes the screw rod (13) rotate and adjusts the distance extending into the positioning plate (7) for adjusting the pre-tightening force of the spring (11).
5. The piano caster according to claim 2, characterized in that: The buffer pad (9) protrudes the hypotenuse of the side surface of the movable bracket (5), so that the buffer pad (9) abuts against the bushing.
6. The piano caster according to claim 1, characterized in that: The connecting shaft assembly (3) includes a connecting shaft (15) and a bearing (16). The bearing (16) is fixed to the top plate (4) of the caster bracket (2). The bottom of the connecting shaft (15) is fixed to the top of the bearing (16). After installation, the caster bracket (2) rotates freely around the connecting shaft (15).