Long hinge of piano

Abstract

The utility model discloses a piano long hinge which comprises a first hinge group (1) connected with a piano top fixing plate (4), a second hinge group (2) connected with a piano top cover (5) and a hinge shaft (3) connected with the first hinge group (1) and the second hinge group (2), the first hinge group (1) and the second hinge group (2) are formed by splicing a plurality of single hinge pieces (6) end to end to form a long strip shape, a buckling structure is arranged at the joint of every two adjacent hinge pieces (6), the two adjacent hinge pieces (6) are pressed downwards at the same time, a hinge shaft sleeve (7) is arranged on the side edge of each hinge piece (6), the whole hinge pieces are divided into multiple sections by the hinge, and the splicing structure is adopted, so that the hinge is convenient to assemble and disassemble. And meanwhile, a hinge sleeve is arranged on each block, so that the installation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of piano accessories technology, specifically a long piano hinge. Background Technology

[0002] The applicant's prior application for a piano long hinge includes a first hinge plate installed on the front top cover, a second hinge plate installed on the rear top cover, and a hinge shaft. The first hinge plate has a plurality of spaced-apart first hinge sleeves along one side of its length, with a gap between adjacent first hinge sleeves. The second hinge plate has a plurality of spaced-apart second hinge sleeves along one side of its length, with a gap between adjacent second hinge sleeves. The side of the first hinge plate with the first hinge sleeves interlocks with the side of the second hinge plate with the second hinge sleeves, and the first and second hinge sleeves are spaced apart sequentially. The hinge shaft passes sequentially through the first hinge sleeves and the second hinge plate from one end. The key feature is that the other side of the first hinge plate has a first flange along its length, which is embedded in a first groove on the side of the front top cover. This structure provides a positioning mechanism between the two hinge plates of the piano long hinge and the front and rear top covers, making the assembly of the front and rear top covers more convenient, efficient, and precise. However, this hinge structure has disadvantages compared to most existing hinges: both hinge pieces are integral structures, which are convenient to process, but in the actual manufacturing process, the process is relatively complex in order to achieve the flatness of the product and the rolling of the hinge sleeve. Moreover, in order to achieve the best straightness and flatness, the processing precision is high, resulting in high manufacturing costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a long piano hinge that divides a whole hinge piece into multiple segments and adopts a splicing structure, and sets a hinge sleeve on each segment, thereby facilitating installation.

[0004] The technical solution of this utility model is to provide a long piano hinge with the following structure: a first hinge group connected to the top fixed plate of the piano, a second hinge group connected to the top cover of the piano, and a hinge shaft connecting the first hinge group and the second hinge group; characterized in that: the first hinge group and the second hinge group are formed by splicing several single hinge pieces end to end into a long strip shape, the connection between two adjacent hinge pieces is provided with a fastening structure and is pressed downwards simultaneously, each hinge piece is provided with a hinge shaft sleeve on its side, the length of the hinge shaft sleeve is half the length of the hinge piece, the hinge shaft sleeve of one of the hinge pieces in the first hinge group and the hinge shaft sleeve of one of the hinge pieces in the second hinge group are sleeved on the hinge shaft, and the two hinge shafts are spliced ​​end to end to form the length of one hinge piece.

[0005] The connection between two adjacent hinge pieces is provided with a snap-fit ​​structure, meaning that each hinge piece has a first connecting piece at one end and a second connecting piece at the other end. The thickness of the first and second connecting pieces is less than the thickness of the hinge piece. The first connecting piece has an upward-facing first groove, and the second connecting piece has a downward-facing second groove. A first positioning groove is provided on the inner side of the first groove, and a first positioning protrusion is provided on the outer side. A second positioning groove is provided on the inner side of the second groove, and a second positioning protrusion is provided on the outer side. When two adjacent hinge pieces are snapped together, the first and second connecting pieces overlap and fit together.

[0006] When two adjacent hinge pieces are engaged, the bottom surface of the first groove is in contact with the bottom surface of the second groove, the first positioning protrusion is embedded in the second positioning groove, and the second positioning protrusion is embedded in the first positioning groove.

[0007] The ends of the first hinge group and the second hinge group are flat.

[0008] The hinge shaft includes a shaft body, several connecting sleeves, and washers. The hinge shaft sleeve of each hinge piece is fitted outside the connecting sleeve, each connecting sleeve is fitted outside the shaft body, and each washer is located between adjacent hinge shaft sleeves and fitted outside the shaft body.

[0009] The shaft body has threaded holes at both ends, and the hinge bushing on the shaft body is axially pressed by bolts.

[0010] With the above structure, this utility model has the following advantages: 1. By setting a unique interlocking structure between two adjacent hinge pieces and applying downward pressing force, the tightness and stability of the connection are ensured, effectively preventing loosening or separation that may occur during long-term use, and enhancing the service life and reliability of the entire hinge. 2. The elongated structure formed by the hinge pieces being connected end to end, and the design that the length of the hinge bushing is half the length of the hinge piece, ensures the functionality of the hinge while maximizing space saving. 3. The segmented hinge piece design ensures that damage to individual parts will not affect the normal operation of the entire hinge. Users can easily replace damaged hinge pieces without replacing the entire hinge, reducing maintenance costs. 4. While improving the performance of the piano lid opening and closing mechanism, it also reduces machining precision and manufacturing costs.

[0011] As an improvement, the connection between two adjacent hinge pieces is provided with a snap-fit ​​structure, meaning that each hinge piece has a first connecting piece at one end and a second connecting piece at the other end. The thickness of the first and second connecting pieces is less than the thickness of the hinge piece. The first connecting piece has an upward-facing first groove, and the second connecting piece has a downward-facing second groove. A first positioning groove is provided on the inner side of the first groove, and a first positioning protrusion is provided on the outer side. A second positioning groove is provided on the inner side of the second groove, and a second positioning protrusion is provided on the outer side. When two adjacent hinge pieces are snapped together, the first and second connecting pieces overlap and fit together. This connection has high strength and good inherent positioning.

[0012] As an improvement, when two adjacent hinge pieces are in the latching state, the bottom surface of the first groove is in contact with the bottom surface of the second groove, the first positioning protrusion is embedded in the second positioning groove, and the second positioning protrusion is embedded in the first positioning groove, further increasing the connection strength.

[0013] As an improvement, the hinge shaft includes a shaft body, several connecting sleeves, and washers. The hinge shaft sleeve of each hinge piece is sleeved outside the connecting sleeve, each connecting sleeve is sleeved outside the shaft body, and each washer is located between adjacent hinge shaft sleeves and sleeved outside the shaft body, so that rotation can be guaranteed while not affecting each other.

[0014] As an improvement, threaded holes are provided at both ends of the shaft body, and the hinge bushing on the shaft body is axially pressed by bolts, which facilitates disassembly and installation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the piano long hinge of this utility model.

[0016] Figure 2 This is a schematic diagram of the split components of the piano long hinge of this utility model.

[0017] Figure 3 An exploded diagram of two adjacent hinge pieces.

[0018] Figure 4 This is a schematic diagram of the hinge piece of this utility model.

[0019] Figure 5 This is a schematic diagram of the split components of the piano long hinge of this utility model.

[0020] Figure 6 This is a schematic diagram showing the connection between two hinge pieces.

[0021] Figure 7 This is a cross-sectional view of the hinge shaft of this utility model.

[0022] As shown in the figure:

[0023] 1. First hinge assembly; 2. Second hinge assembly; 3. Hinge shaft; 4. Top mounting plate of piano; 5. Top cover of piano; 6. Hinge piece; 7. Hinge bushing; 8. First connecting piece; 9. Second connecting piece; 10. First groove; 11. Second groove; 12. First positioning groove; 13. First positioning protrusion; 14. Second positioning groove; 15. Second positioning protrusion; 16. Shaft body; 17. Connecting sleeve; 18. Washer; 19. Bolt. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1-7 As shown, the piano long hinge of this utility model includes a first hinge group 1 connected to the piano top fixing plate 4, a second hinge group 2 connected to the piano top cover 5, and a hinge shaft 3 connecting the first hinge group 1 and the second hinge group 2.

[0026] like Figure 1 and Figure 2 As shown, the first hinge group 1 and the second hinge group 2 are formed by splicing several single hinge pieces 6 end to end into a long strip shape. The connection between two adjacent hinge pieces 6 is provided with a snap-fit ​​structure and is pressed down simultaneously. Each hinge piece 6 has a hinge bushing 7 on its side. The length of the hinge bushing 7 is half the length of the hinge piece 6. The hinge bushing 7 of one of the hinge pieces 6 in the first hinge group 1 and the hinge bushing 7 of one of the hinge pieces 6 in the second hinge group 2 are fitted onto the hinge shaft 3, and the two hinge shafts 3 are spliced ​​end to end to form the length of one hinge piece 6. That is, the length of the hinge bushing 7 is half the length of one hinge piece 6. When two facing hinge pieces 6 are combined into a group, the two hinge bushings 7 are spliced ​​left and right.

[0027] like Figure 2 , Figure 3 As shown, the snap-fit ​​structure at the connection between two adjacent hinge pieces 6 means that each hinge piece 6 has a first connecting piece 8 at one end and a second connecting piece 9 at the other end. The thickness of the first connecting piece 8 and the second connecting piece 9 is less than the thickness of the hinge piece 6. The first connecting piece 8 has an upward-facing first groove 10 located at the top of the first connecting piece 8, with an upward opening, for accommodating the second connecting piece 9 from the adjacent hinge piece 6. This groove design ensures the stability of the connection. The second connecting piece 9 has a downward-facing second groove 11 located at the bottom of the second connecting piece 9, with a downward opening, for insertion into the first connecting piece 8 of the adjacent hinge piece 6. This groove design matches the first groove 10, forming a complete snap-fit ​​unit, ensuring a tight connection.

[0028] A first positioning groove 12 is provided on the inner side of the first groove 10, and a first positioning protrusion 13 is provided on the outer side. The first positioning groove 12 is located on the inner side of the first groove 10 and serves as a positioning feature to ensure that adjacent hinge pieces can be accurately aligned when fastened. The first positioning protrusion 13 is located on the outer side of the first groove 10 and cooperates with the second positioning groove 14 on the second connecting piece 9 of the adjacent hinge piece 6 to form a snap-fit ​​structure.

[0029] A second positioning groove 14 is provided on the inner side of the second groove 11, and a second positioning protrusion 15 is provided on the outer side; located at the bottom of the second connecting piece 9, it opens downwards for insertion into the first connecting piece 8 of the adjacent hinge piece 6. The design of this groove matches the first groove 10, forming a complete fastening unit and ensuring a tight connection. Located on the inner side of the second groove 11, it cooperates with the first positioning protrusion 13 on the first connecting piece 8 to provide a precise positioning function. Located on the outer side of the second groove 11, it cooperates with the first positioning groove 12 on the first connecting piece 8 of the adjacent hinge piece 6 to form a double locking structure.

[0030] When two adjacent hinge pieces 6 are in the snap-fit ​​state, the first connecting piece 8 and the second connecting piece 9 overlap and fit together.

[0031] like Figure 2 , Figure 3 and Figure 6 As shown, in the latching state, the bottom surface of the first groove 10 of the two adjacent hinge pieces 6 is in contact with the bottom surface of the second groove 11, the first positioning protrusion 13 is embedded in the second positioning groove 14, and the second positioning protrusion 15 is embedded in the first positioning groove 12.

[0032] The ends of the first hinge group 1 and the second hinge group 2 are flat, because no additional first connecting piece 8 or second connecting piece 9 is needed at both ends. The ends of the first hinge group 1 and the second hinge group 2 directly adopt the same thickness and flat surface as the main body of the hinge piece 6, without any additional grooves or protrusions.

[0033] like Figure 5 and Figure 7 As shown, the hinge shaft 3 includes a shaft body 16, a plurality of connecting sleeves 17 and washers 18. The hinge shaft sleeve 7 of each hinge piece 6 is fitted outside the connecting sleeve 17, each connecting sleeve 17 is fitted outside the shaft body 16, and each washer 18 is located between adjacent hinge shaft sleeves 7 and is fitted outside the shaft body 16.

[0034] like Figure 5 As shown, threaded holes are provided at both ends of the shaft body 16, and the hinge bushing 7 on the shaft body 16 is axially pressed by bolts 19.

Claims

1. A long hinge for a piano, comprising a first hinge group (1) connected to a top plate (4) of the piano, a second hinge group (2) connected to a top cover (5) of the piano, and a hinge shaft (3) connecting the first hinge group (1) and the second hinge group (2); characterized in that: The first hinge group (1) and the second hinge group (2) are formed by splicing several single hinge pieces (6) end to end into a long strip. The connection between two adjacent hinge pieces (6) is provided with a snap-fit ​​structure and is pressed down at the same time. Each hinge piece (6) is provided with a hinge bushing (7) on its side. The length of the hinge bushing (7) is half the length of the hinge piece (6). The hinge bushing (7) of one of the hinge pieces (6) in the first hinge group (1) and the hinge bushing (7) of one of the hinge pieces (6) in the second hinge group (2) are fitted on the hinge shaft (3) and the hinge shafts (3) of the two are spliced ​​end to end to form the length of one hinge piece (6).

2. The piano long hinge according to claim 1, characterized in that: The connection between two adjacent hinge pieces (6) is provided with a snap-fit ​​structure, which means that each hinge piece (6) has a first connecting piece (8) at one end and a second connecting piece (9) at the other end. The thickness of the first connecting piece (8) and the second connecting piece (9) is less than the thickness of the hinge piece (6). The first connecting piece (8) has an upward-facing first groove (10), and the second connecting piece (9) has a downward-facing second groove (11). The first positioning groove (12) is provided on the inner side of the first groove (10), and the first positioning protrusion (13) is provided on the outer side. The second positioning groove (14) is provided on the inner side of the second groove (11), and the second positioning protrusion (15) is provided on the outer side. When the two adjacent hinge pieces (6) are snap-fitted, the first connecting piece (8) and the second connecting piece (9) overlap and fit together.

3. The piano long hinge according to claim 2, characterized in that: When two adjacent hinge pieces (6) are in the latching state, the bottom surface of the first groove (10) is in contact with the bottom surface of the second groove (11), the first positioning protrusion (13) is embedded in the second positioning groove (14), and the second positioning protrusion (15) is embedded in the first positioning groove (12).

4. The piano long hinge according to claim 2, characterized in that: The ends of the first hinge group (1) and the second hinge group (2) are flat.

5. The piano long hinge according to claim 1, characterized in that: The hinge shaft (3) includes a shaft body (16), several connecting sleeves (17) and washers (18). The hinge shaft sleeve (7) of each hinge piece (6) is fitted outside the connecting sleeve (17), each connecting sleeve (17) is fitted outside the shaft body (16), and each washer (18) is located between adjacent hinge shaft sleeves (7) and fitted outside the shaft body (16).

6. The piano long hinge according to claim 5, characterized in that: The shaft body (16) has threaded holes at both ends, and the hinge bushing (7) on the shaft body (16) is axially pressed by bolts (19).

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