Piano trundle adopting quick release structure

Abstract

The utility model discloses a piano trundle adopting a quick release structure. The piano trundle comprises a roller (1), a trundle bracket (2), a connecting shaft (3) and a supporting leg (4), the connecting shaft (3) comprises a first shaft body (5) and a second shaft body (6), a support shaft sleeve (12) is sleeved outside the second shaft body (6) located at the top of the trundle support (2), a swing arm (7) and a quick disassembly shaft (8) are further arranged outside the trundle support (2), the swing arm (7) is rotatably connected with the trundle support (2), the idler wheel (1) is installed on the swing arm (3) through the quick disassembly shaft (8), and the swing arm (7) and the trundle support (2) are provided with locking structures. According to the piano trundle, the swing arm is additionally arranged, and the idler wheel is detachably mounted on the swing arm, so that the stability of the idler wheel can be improved while the idler wheel is quickly disassembled, and a piano can move more stably.

Description

Technical Field

[0001] The utility model relates to the technical field of piano accessories, in particular to a piano caster with a quick-disassembly structure. Background Art

[0002] A piano caster is currently disclosed, comprising a connecting shaft, a bracket, and two rollers. The connecting shaft is disposed at the top of the bracket, and a boss is provided on the connecting shaft. The boss is connected to the bottom of the piano leg, and a through hole for a mounting bolt is provided on the boss. A spacing is provided between the boss and the top of the bracket. The bracket is provided with two mounting arms at the bottom, and the two rollers are disposed between the two mounting arms via a connecting shaft. A partition is provided between the two rollers, and the outer end surfaces of the rollers are provided with an annular groove. The bracket is connected to a support device, which extends and retracts below the bracket in a direction parallel to the connecting shaft, with the lowest point of the support device being flush with the lowest point of the rollers. The support device comprises a base and an adjustment screw. The bracket is provided with a first threaded hole, and the adjustment screw is threaded through the threaded hole. The center of the base is provided with a second threaded hole, and the bottom of the adjustment screw is screwed into the second threaded hole of the base. The caster adds a support device so that the support device contacts the ground, avoiding direct contact between the roller and the installation of the roller. However, in actual use, there are still some shortcomings: since the roller is installed on the base, and the base is fixed, there are great difficulties in disassembling and assembling the roller later.

[0003] Also disclosed is a piano caster comprising a connecting shaft, a mounting bracket, a set of rollers, and a pin. The bottom of the connecting shaft is connected to the top of the mounting bracket. The mounting bracket has two side walls. The pin passes through the center hole of the roller and the two are rotatably connected. The two ends of the pin extend from the ends of the roller. The two side walls of the mounting bracket have symmetrical arcuate grooves. The two ends of the pin extending from the roller are respectively embedded in the arcuate grooves of the two side walls. Both side walls are provided with locking structures, and the locking structures on each side lock the pin embedded in the arcuate grooves. The locking structure includes a locking block and a locking bolt. The locking block matches the shape of the arcuate groove, and the bottoms of the two sides form a circular hole for the pin to be inserted. The locking bolt passes through the first threaded hole of the locking block and is screwed into the second threaded hole of the mounting bracket. The locking force of the locking structure of the above structure is still weak, and the roller shakes when the piano is moved, resulting in unstable movement of the piano. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a piano caster with a quick-release structure, which adds a swing arm and detachably installs a roller on the swing arm, thereby realizing quick-release of the roller and increasing the stability of the roller, making the movement of the piano more stable.

[0005] The technical solution of the utility model is to provide a piano caster with the following structure and a quick-release structure, including a roller, a caster bracket, a connecting shaft and a supporting foot; the connecting shaft includes a first shaft body and a second shaft body, the outer diameter of the first shaft body is larger than the outer diameter of the second shaft body, the first shaft body is located at the bottom of the caster bracket, the second shaft body passes through the caster bracket body and extends out of the top of the caster bracket, the second shaft body located at the top of the caster bracket is outerly provided with a bracket shaft sleeve, the supporting foot is located next to the roller and is arranged along the height direction, the top of the supporting foot passes through the threaded hole of the caster bracket and is tightened with the nut on the top for height positioning; it is characterized in that: a swing arm and a quick-release shaft are also provided outside the caster bracket, the swing arm is rotatably connected to the caster bracket, the roller is mounted on the swing arm through a quick-release shaft, and the swing arm and the caster bracket are provided with a locking structure.

[0006] The locking structure is one or more locking screws, which pass through the through holes of the top plate and are screwed into the threaded holes of the caster bracket.

[0007] The center hole of the roller passes through the quick-release shaft and swings around the caster bracket synchronously with the swing arm.

[0008] The swing arm includes a top plate and two side plates. The top plate is rotatably connected to the caster bracket through a rotating shaft. The quick-release shaft is installed on the two side plates. A distance is set between the side plate on each side and the side wall of the caster bracket.

[0009] One side of the caster bracket is provided with two side walls, the side plate on each side is located outside the side wall of the caster bracket, and the side wall on each side is provided with a groove, and the quick-disassembly shaft is embedded in the groove.

[0010] After the locking screw is tightened with the threaded hole of the caster bracket, the quick-release shaft is abutted against the bottom surface of the groove.

[0011] The opening of the groove is inclined upward and is an arc-shaped groove, and the center of the arc is the axis of the connecting shaft of the swing arm and the caster bracket.

[0012] After adopting the above structure, the utility model has the following advantages:

[0013] 1. Add a swing arm to one side of the caster bracket so that the swing arm is rotatably connected to the caster bracket, and install the roller on the swing arm in a detachable manner, so that the roller is stably installed on the swing arm, which can ensure sufficient strength and avoid shaking of the roller when the piano is moved.

[0014] 2. The added swing arm can swing up and down. When installing the roller, the swing arm swings upward. The roller is installed by quickly disassembling the shaft. After installation, the swing arm swings downward to facilitate removal and installation.

[0015] 3. By quickly disassembling the shaft, the roller can be quickly installed on the swing arm, and the swing arm can be flipped up before disassembling the roller, achieving fast and convenient installation.

[0016] As an improvement, the locking structure is one or more locking screws, which pass through the through holes of the top plate and are screwed into the threaded holes of the caster bracket. The use of locking screws can achieve detachable fixation, and after fixation, the connection strength between the swing arm and the caster bracket can be guaranteed.

[0017] As an improvement, the center hole of the roller passes through the quick-release shaft and swings synchronously with the swing arm around the caster bracket, so that the roller can rotate freely under the swing arm.

[0018] As an improvement, the swing arm includes a top plate and two side plates. The top plate is rotatably connected to the caster bracket through a rotating shaft. The quick-release shaft is installed on the two side plates. There is a gap between the side plate on each side and the side wall of the caster bracket, so that the swing arm covers one side of the caster bracket to ensure the installation position of the roller on the swing arm.

[0019] As an improvement, one side of the caster bracket is provided with two side walls, the side plate on each side is located on the outside of the side wall of the caster bracket, and the side wall on each side is provided with a groove, and the quick-release shaft is embedded in the groove to prevent the roller from falling off.

[0020] As an improvement, after the locking screw is tightened with the threaded hole of the caster bracket, the quick-release shaft is abutted against the bottom surface of the groove, further supporting the quick-release shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the installation state of the piano casters adopting the quick-release structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the swing arm of the piano caster with a quick-release structure in the upward swing state of the present invention.

[0023] Figure 3 This is a top view of the piano caster with a quick-release structure of the present invention.

[0024] Figure 4 This is an exploded view of the piano caster with a quick-release structure of the present invention.

[0025] Figure 5 It is a schematic diagram of the swing arm of the present utility model.

[0026] Figure 6 This is a schematic diagram of the caster bracket of the present invention.

[0027] Figure 7 This is a schematic diagram of the connection between the quick-disassembly shaft and the roller of the present utility model.

[0028] As shown in the figure:

[0029] 1. Roller, 2. Caster bracket, 3. Connecting shaft, 4. Support foot, 5. First axis, 6. Second axis, 7. Swing arm, 8. Quick release shaft, 9. Top plate, 10. Side plate, 11. Locking screw, 12. Groove. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] like Figure 1-7 As shown, a piano caster with a quick-release structure of the present invention includes a roller 1, a caster bracket 2, a connecting shaft 3 and a supporting foot 4.

[0032] like Figure 4 As shown, the connecting shaft 3 includes a first shaft 5 and a second shaft 6. The outer diameter of the first shaft 5 is larger than that of the second shaft 6. The first shaft 5 is located at the bottom of the caster bracket 2, and the second shaft 6 extends from the main body of the caster bracket 2 to the top of the caster bracket 2. The second shaft 6 located at the top of the caster bracket 2 is covered with a bracket sleeve 12. The bracket sleeve 12 is designed to be embedded in the bottom of the piano. Generally, the bottom of a piano is equipped with four casters.

[0033] like Figure 1 and Figure 4 As shown, the support foot 4 is located next to the roller 1 and is set along the height direction. The top of the support foot 4 passes through the threaded hole of the caster bracket 2 and is tightened with the nut on the top to position the height. After moving or during maintenance, the support foot 4 can be raised to make the roller 1 leave the ground.

[0034] The caster bracket 2 is further provided with a swing arm 7 and a quick-release shaft 8. The swing arm 7 is rotatably connected to the caster bracket 2. The roller 1 is installed on the swing arm 3 through the quick-release shaft 8. The swing arm 7 and the caster bracket 2 are provided with a locking structure.

[0035] The quick-release axle 8 has the following specific features: The axle is a metal rod that passes through the center of the wheel. The handle is located at one end of the axle, usually a widened handle that can be turned manually. A spring or tightening mechanism helps keep the axle in place and provides tension to prevent the wheel from moving loose. A pressure plate or shackle is located at the other end of the axle. When the quick-release axle is closed, these components press against the fork crown of the wheel.

[0036] like Figure 2 and Figure 3 As shown, the locking structure is one or more locking screws 11, two in this embodiment, arranged in parallel. The locking screws 11 pass through the through hole of the top plate 9 and are screwed into the threaded hole of the caster bracket 2, fixing the top plate 9 of the swing arm 7 and the caster bracket 2 together.

[0037] The center hole of the roller 1 passes through the quick-release shaft 8. In this embodiment, there are two rollers 1, which swing synchronously around the caster bracket 2 following the swing arm 3.

[0038] like Figure 4 As shown, the swing arm 3 includes a top plate 9 and side plates 10 on both sides, forming a cover-type structure. The top plate 9 is rotatably connected to the caster bracket 2 through a rotating shaft. The quick-release shaft 8 is installed on the side plates 10 on both sides. There is a distance between the side plate 10 on each side and the side wall of the caster bracket 2.

[0039] like Figure 6 As shown, one side of the caster bracket 2 is provided with two side walls, and the side plate 10 on each side is located outside the side wall of the caster bracket 2. The side wall on each side is provided with a groove 12, and the quick-release shaft 8 is embedded in the groove 12.

[0040] After the locking screw 11 is tightened with the threaded hole of the caster bracket 2, the quick-release shaft 8 is abutted against the bottom surface of the groove 12. The bottom of the locking screw 11 passes through the threaded hole, so that there is enough space to tighten it.

[0041] The opening of the groove 12 is tilted upward and is an arc-shaped groove, and the center of the arc is the axis of the connecting shaft between the swing arm 7 and the caster bracket 2.

Claims

1. A piano caster with a quick-release structure, comprising a roller (1), a caster bracket (2), a connecting shaft (3) and a supporting foot (4); the connecting shaft (3) comprises a first shaft body (5) and a second shaft body (6), the outer diameter of the first shaft body (5) is larger than the outer diameter of the second shaft body (6), the first shaft body (5) is located at the bottom of the caster bracket (2), the second shaft body (6) passes through the caster bracket (2) body and extends out of the top of the caster bracket (2), the second shaft body (6) located at the top of the caster bracket (2) is covered with a bracket sleeve (12), the supporting foot (4) is located next to the roller (1) and is arranged in the height direction, the top of the supporting foot (4) passes through the threaded hole of the caster bracket (2) and is screwed with the nut on the top to be positioned at the height; it is characterized in that: The caster bracket (2) is further provided with a swing arm (7) and a quick-release shaft (8); the swing arm (7) is rotatably connected to the caster bracket (2); the roller (1) is mounted on the swing arm (3) via the quick-release shaft (8); and a locking structure is provided between the swing arm (7) and the caster bracket (2).

2. The piano caster with a quick-release structure according to claim 1, characterized in that: The locking structure is one or more locking screws (11), and the locking screws (11) pass through the through holes of the top plate (9) and are screwed into the threaded holes of the caster bracket (2).

3. The piano caster with a quick-release structure according to claim 1, characterized in that: The center hole of the roller (1) passes through the quick-release shaft (8), and swings synchronously with the swing arm (3) around the caster bracket (2).

4. A piano caster with a quick-release structure according to claim 1: the swing arm (3) includes a top plate (9) and two side plates (10), the top plate (9) is rotatably connected to the caster bracket (2) through a rotating shaft, the quick-release shaft (8) is installed on the two side plates (10), and a distance is provided between the side plate (10) on each side and the side wall of the caster bracket (2).

5. The piano caster with a quick-release structure according to claim 1, characterized in that: One side of the caster bracket (2) is provided with two side walls, and the side plate (10) on each side is located outside the side wall of the caster bracket (2). The side wall on each side is provided with a groove (12), and the quick-detachable shaft (8) is embedded in the groove (12).

6. The piano caster with a quick-release structure according to claim 2, characterized in that: After the locking screw (11) is tightened with the threaded hole of the caster bracket (2), the quick-disassembly shaft (8) is abutted against the bottom surface of the groove (12).

7. The piano caster with a quick-release structure according to claim 5 or 6, characterized in that: The opening of the groove (12) is tilted upward and is an arc-shaped groove, the center of which is the axis of the connecting shaft between the swing arm (7) and the caster bracket (2).

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