A vertical piano lock

Abstract

The present invention discloses an upright piano lock, comprising a lock cylinder (1), a lock seat (2), a key (3) and a lock plate (4); the lock seat (2) is embedded in a keyboard cover (5); in an unlocked state, the lock tongue (7) is retracted in the lock seat (2) and positioned in an unlocked position by a spring sheet (8); in a locked state, the front end of the key (3) is turned a second time and the lock cylinder (1) is pushed to move laterally so that the lock tongue (7) is engaged with a lock door stop (6) and positioned in a locked position by a spring sheet (8). The piano lock adds a lock plate to replace a fixing frame, a cover plate, a latch, a torsion spring and an elastic block, adds a locking structure in the lock seat and directly adds a spring sheet to the lock seat, so that the spring sheet always provides an outward elastic force to the lock tongue to position the lock tongue, and the structure is simpler and can be installed in a lock door stop with a smaller height.

Description

Technical Field

[0001] The invention relates to the technical field of piano parts, in particular to a piano lock for an upright piano. Background Art

[0002] Currently, a piano lock mechanism is disclosed, comprising a lock cylinder structure embedded in a front top cover, a lock base structure provided on a lock door stop, and a key assembly. The lock hole provided on the lock cylinder structure is located on the front face of the front top cover, the lock tongue provided on the lock cylinder structure is located on the bottom face of the front top cover, and the positioning hole provided on the lock base structure is located on the top face of the lock door stop. The positioning hole on the lock base structure corresponds to the position of the lock hole on the lock cylinder structure. In a locked state, the lock tongue of the lock cylinder structure extends out and is inserted into the positioning hole of the lock base structure and positioned vertically. The latch pin of the lock base structure extends downward from the bottom face of the lock door stop and abuts against the back face of the key cover, which is positioned along a rotation axis. In an unlocked state, the lock tongue of the lock cylinder structure retracts away from the lock hole of the lock base structure into the lock cylinder structure, the latch pin of the lock base structure retracts upward into the lock door stop, and the key cover swings along the rotation axis. The key assembly is used to be inserted into the lock hole of the lock cylinder structure and drive the lock cylinder structure to extend or retract. The key assembly includes a key and a drive rod, the drive rod being located at the front end of a straight rod of the key and perpendicular to the straight rod of the key. The lock seat structure includes a fixing frame, a cover plate, a latch, a torsion spring and an elastic block. The fixing frame is arranged in a vertical direction and is provided with a top plate. The top plate is perpendicular to the fixing frame. The top plate is provided with a first through hole. The elastic block is movably embedded in the first through hole of the top plate. The top end of the latch is fixed to the bottom of the elastic block. The latch movably passes through the guide holes of two or more guide blocks provided on the side of the fixing frame. The outer wall of the latch is provided with a limiting rod. The guide block is wrapped with a cover plate. The cover plate is fixed to the fixing frame. The cover plate is provided with a first notch. The limiting rod on the latch passes through the first notch. The locking cam is engaged with the locking cam of the locking cam and the spring, and the locking cam is engaged with the locking cam of the locking cam and the spring, when the locking cam is engaged, ...

[0003] The piano lock mechanism of the above structure is installed between the front top cover and the lock door block. Currently, there is a need for a piano lock that can be installed between the keyboard cover and the lock door block below. If the piano lock between the front top cover and the lock door block is installed on the keyboard cover, then there are the following disadvantages: 1. Due to the small height of the lock door block, there is no space to install the lock seat structure, especially the bolt, its own height and the required upward sliding space. 2. The downward extension of the lock tongue of the lock head structure is driven by the key, and the positioning requires the bolt and elastic block below to provide an upward elastic force to locate the position of the lock tongue. In other words, the lock tongue does not have an elastic and positioning structure in the lock head, and needs to rely on the lock seat structure below to provide it, which makes the structure complicated. Moreover, during installation, it is necessary to adjust the elastic force and locking strength of the lock head structure and the lock seat structure, which also brings inconvenience to the installation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a lock plate to replace the fixing frame, cover plate, latch, torsion spring and elastic block, add a locking structure in the lock seat and directly add a spring sheet to the lock seat, so that the spring sheet always provides an outward elastic force to the lock tongue to position the lock tongue. The structure is simpler and can be installed in an upright piano lock with a lock door block of a smaller height.

[0005] The technical solution of the upright piano lock of the present invention is to provide an upright piano lock with the following structure, comprising a lock cylinder, a lock seat, a key and a lock plate; the lock seat is embedded in the keyboard cover, the front panel of the keyboard cover is provided with a first lock hole, the front panel of the lock seat is provided with a second lock hole aligned with the first lock hole, the bottom plate of the lock seat is provided with a first through hole, the lock cylinder is located in the lock seat, the front end of the lock cylinder is a lock tongue, the center of the lock cylinder is provided with a notch, a spring piece is provided in the lock seat and always abuts against the lock cylinder, the lock plate is embedded in the lock door stop and has a second through hole on the top; the front end of the key passes through the first lock hole and the second lock hole and is embedded in the notch; in the unlocked state, the lock tongue is retracted in the lock seat and is positioned in the unlocked position by the spring piece; the front end of the key is turned for the first time and pushes the lock tongue to extend outward in a straight line from the first through hole and into the second through hole of the lock plate; in the locked state, the front end of the key is turned for the second time and pushes the lock cylinder to move laterally so that the lock tongue is engaged with the lock door stop and is positioned in the locked position by the spring piece.

[0006] The notch includes three smoothly connected arc surfaces, namely the first arc surface, the second arc surface and the third arc surface. When the front end of the key is located on the first arc surface, it corresponds to the unlocked state; when it is located on the second arc surface, the lock tongue extends outward; when it is located on the third arc surface, the lock tongue moves horizontally and is locked.

[0007] A first positioning groove and a second positioning groove are provided on the top of the lock core and on the edge of the notch. The first positioning groove is located between the notch and the first positioning groove. The openings of the first positioning groove and the second positioning groove are upward. The depth of the second positioning groove is greater than the depth of the first positioning groove. A positioning rod is provided on the lock seat; in the unlocked state, the positioning rod abuts against the bottom of the first positioning groove and the spring sheet pushes the lock core to retract with elastic force; in the locked state, the positioning rod abuts against the bottom of the second positioning groove and the spring sheet pushes the lock core to retract with elastic force.

[0008] The spring sheet is arc-shaped, with a first hook at one end and a second hook at the other end. The first hook is sleeved on the first fixed rod of the lock seat and the end portion extends outward to form a first extension section. The first extension section is against the second fixed rod on the lock seat, so that the middle part of the spring sheet has elasticity; the second hook is against or away from the positioning rod, and the end portion extends outward to form a second extension section; in the unlocked state, the second hook is away from the positioning rod and the second extension section is against the third fixed rod on the lock core, and the second extension section provides elastic force for the lock core to retract; in the locked state, the second hook is sleeved outside the positioning rod and provides elastic force for the lock core to retract.

[0009] The middle of the spring sheet is located on the edge of the notch, the front end of the key abuts against the spring sheet and the side wall of the notch, and the front end of the key is rotated to push the spring sheet and the side wall of the notch at the same time.

[0010] A step is provided on one side of the lock core, and in a locked state, the step abuts against the second fixing rod for positioning.

[0011] A positioning block is provided on the lock seat, the side wall of the lock core close to the second positioning groove is a first plane, and the side wall of the positioning block is a second plane. When the front end of the key is rotated to the first arc surface position, the lock core moves up and down based on the contact surface between the second plane and the first plane.

[0012] In the unlocked state, the second extension section of the second hook pushes the third fixing rod upward, so that the bottom of the first positioning groove is against the positioning rod, and the lock tongue is retracted in the lock seat to locate the unlocked position; from the unlocked state to the locked state: the front end of the key is turned for the first time and the second arc surface of the notch is pushed, so that the lock tongue extends outward in a straight line from the first through hole and extends into the second through hole of the lock plate, and the second positioning groove is separated from the positioning rod; in the locked state: the front end of the key is turned for the second time, and the third arc surface of the notch is driven to push the lock core to move horizontally so that the lock tongue is engaged with the lock door stop, and the second hook pushes the positioning rod and is against the bottom of the second positioning groove, positioning it in the locked position.

[0013] After adopting the above structure, the present invention has the following advantages: 1. The fixing frame, cover plate, latch, torsion spring and elastic block are eliminated. Only one lock plate needs to be installed on the door lock block below the keyboard cover, so that the door lock block has enough installation space. Only one through hole is opened on the lock plate for the lock tongue to be engaged, which saves installation space and makes the structure simpler. 2. A spring sheet is added to the lock seat of this structure. The spring sheet always pushes the lock cylinder, so that the lock cylinder is positioned in the unlocking position and the locking position. In the unlocking state, the lock tongue is retracted in the lock seat and positioned in the unlocking position by the spring sheet. In the locking state, the front end of the key is turned for the first time and the lock tongue is pushed straight out of the first through hole and into the second through hole of the lock plate. The front end of the key is turned for the second time and the lock cylinder is pushed to move horizontally so that the lock tongue is engaged with the door lock block and positioned in the locking position by the spring sheet. This locking method makes the structure simpler.

[0014] As an improvement, the notch includes three smoothly connected arc surfaces, namely the first arc surface, the second arc surface and the third arc surface. When the front end of the key is located on the first arc surface, it corresponds to the unlocked state; when it is located on the second arc surface, the lock tongue extends outward; when it is located on the third arc surface, the lock tongue moves horizontally and is locked. The lock core is driven by the key, and the first arc surface, the second arc surface and the third arc surface of the lock core are utilized, so that the key can drive different arc surfaces to change the moving direction of the lock core. The driving reliability is good and the structure is simple.

[0015] As an improvement, a first positioning groove and a second positioning groove are provided at the top of the lock core and on the edge of the notch, the first positioning groove is located between the notch and the first positioning groove, the openings of the first positioning groove and the second positioning groove are facing upward, the depth of the second positioning groove is greater than the depth of the first positioning groove, and a positioning rod is provided on the lock seat; in the unlocked state, the positioning rod is against the bottom of the first positioning groove and the spring sheet pushes the lock core inward with an elastic force; in the locked state, the positioning rod is against the bottom of the second positioning groove and the spring sheet pushes the lock core inward with an elastic force, and the positioning of the unlocked position and the locked position is achieved through the cooperation of the first positioning groove and the second positioning groove with the positioning rod, which can ensure the locking strength.

[0016] As an improvement, the spring sheet is arc-shaped, with a first hook at one end and a second hook at the other end. The first hook is sleeved on the first fixed rod of the lock seat and the end extends outward to form a first extension section. The first extension section is against the second fixed rod on the lock seat, so that the middle part of the spring sheet has elasticity; the second hook is against or away from the positioning rod, and the end extends outward to form a second extension section; in the unlocked state, the second hook is away from the positioning rod and the second extension section is against the third fixed rod on the lock core, and the second extension section provides elastic force for the lock core to retract; in the locked state, the second hook is sleeved outside the positioning rod and provides elastic force for the lock core to retract. The spring sheet can always provide elastic force to the lock core, ensuring the positioning position of the lock core.

[0017] As an improvement, the middle of the spring sheet is located on the edge of the notch, and the front end of the key is against the spring sheet and the side wall of the notch. Turning the front end of the key pushes the spring sheet and the side wall of the notch at the same time. The front end of the key can drive not only the lock core but also the spring sheet, taking both into account at the same time, making the structure more compact.

[0018] As an improvement, a step is provided on one side of the lock core, and in the locked state, the step abuts against the second fixing rod for positioning, thereby increasing the positioning effect in the locked state.

[0019] As an improvement, a positioning block is provided on the lock seat, the side wall of the lock core close to the second positioning groove is a first plane, and the side wall of the positioning block is a second plane. When the front end of the key is rotated to the first arc surface position, the lock core moves up and down based on the contact surface between the second plane and the first plane, ensuring the moving direction of the lock core, so that the lock tongue can extend from the first through hole in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of an explosion of the upright piano lock of the present invention.

[0021] Figure 2 The figure is a three-dimensional schematic diagram of the upright piano lock of the present invention in the unlocked state.

[0022] Figure 3 The figure is a cross-sectional schematic diagram of the upright piano lock of the present invention in the unlocked state.

[0023] Figure 4 It is a three-dimensional schematic diagram of the upright piano lock of the present invention in the intermediate state.

[0024] Figure 5 Schematic cross-sectional view of the upright piano lock of the present invention in an intermediate state.

[0025] Figure 6 It is a three-dimensional schematic diagram of the upright piano lock of the present invention in the locked state.

[0026] Figure 7 It is a cross-sectional schematic diagram of the upright piano lock of the present invention in the locked state.

[0027] Figure 8 Schematic diagram of the spring sheet of the present invention.

[0028] Figure 9 Schematic diagram of the lock core of the present invention.

[0029] As shown in the figure:

[0030] 1. Lock cylinder, 1.1. Notch, 1.1.1. First arc surface, 1.1.2. Second arc surface, 1.1.3. Third arc surface, 1.2. First positioning groove, 1.3. Second positioning groove, 1.4. Step, 1.5. First plane;

[0031] 2. Lock seat, 2.1. Second lock hole, 2.2. First through hole,

[0032] 3. Key, 4. Lock plate, 4.1. Second through hole, 5. Keyboard cover, 5.1. First lock hole, 6. Door stop, 7. Lock tongue,

[0033] 8. Spring leaf, 8.1. First hook, 8.1.1. First extension, 8.2. Second hook, 8.2.1. Second extension,

[0034] 9. Positioning rod, 10. First fixing rod, 11. Second fixing rod, 12. Third fixing rod, 13. Positioning block, 13.1. Second plane. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] like Figure 1-9 As shown, an upright piano lock of the present invention includes a lock cylinder 1, a lock base 2, a key 3 and a lock plate 4; the lock base 2 is embedded in a keyboard cover 5, a first lock hole 5.1 is provided on the front panel of the keyboard cover 5, a second lock hole 2.1 aligned with the first lock hole 5.1 is provided on the front panel of the lock base 2, a first through hole 2.2 is provided on the bottom plate of the lock base 2, and the lock cylinder 1 is located in the lock base 2.

[0037] The front end of the lock core 1 is a lock tongue 7, and a notch 1.1 is provided in the center of the lock core 1. A spring sheet 8 is provided in the lock seat 2 and is always in contact with the lock core 1. The lock plate 4 is embedded in the lock door stop 6 and a second through hole 4.1 is provided on the top. The second through hole 4.1 is used for the lock tongue 7 to be embedded and moved laterally to engage, thereby locking the keyboard cover 5.

[0038] The front end of the key 3 passes through the first lock hole 5.1 and the second lock hole 2.1 and is embedded in the notch 1.1; in the unlocked state, the lock tongue 7 is retracted in the lock seat 2 and is positioned in the unlocked position by the spring sheet 8; in the locked state, the front end of the key 3 is turned for the first time and the lock tongue 7 is pushed to extend straight outward from the first through hole 2.2 and into the second through hole 4.1 of the lock plate 4. The front end of the key 3 is turned for the second time and the lock core 1 is pushed to move horizontally so that the lock tongue 7 is engaged with the door stop 6 and is positioned in the locked position by the spring sheet 8.

[0039] like Figure 2 、 Figure 3 and Figure 9As shown, the notch 1.1 is U-shaped and comprises three smoothly connected arcuate surfaces: a first arcuate surface 1.1.1, a second arcuate surface 1.1.2, and a third arcuate surface 1.1.3. The second arcuate surface 1.1.2 is located at the bottom, the first arcuate surface 1.1.1 is located on the left, and the third arcuate surface 1.1.3 is located on the right. When the front end of the key 3 is located on the first arcuate surface 1.1.1, it corresponds to the unlocked state; when it is located on the second arcuate surface 1.1.2, the lock tongue 7 extends outward; when it is located on the third arcuate surface 1.1.3, the lock tongue 7 moves laterally and is locked.

[0040] like Figure 9 As shown, a first positioning groove 1.2 and a second positioning groove 1.3 are provided at the top of the lock core 1, located on the edge of the notch 1.1. The first positioning groove 1.2 is located between the notch 1.1 and the first positioning groove 1.2. The openings of the first and second positioning grooves 1.2 and 1.3 face upward, and the depth of the second positioning groove 1.3 is greater than that of the first positioning groove 1.2. A positioning rod 9 is provided on the lock base 2. In the unlocked state, the positioning rod 9 abuts against the bottom of the first positioning groove 1.2, and a spring plate 8 pushes the lock core 1 inward. The bottom of the first positioning groove 1.2 can limit the positioning rod 9. In the locked state, the positioning rod 9 abuts against the bottom of the second positioning groove 1.3, and the spring plate 8 pushes the lock core 1 inward. The bottom of the second positioning groove 1.3 is V-shaped, which can position the positioning rod 9. The upward elastic force provided by the spring plate 8 can position the positioning rod 9 in the first or second positioning groove 1.2, 1.3, and once positioned, the lock core 1 cannot move.

[0041] like Figure 8 As shown, the middle portion of the spring piece 8 is arc-shaped and convex downward, thus providing an upward elastic force. The left end of the spring piece 8 is provided with a first hook 8.1, which is generally closed with only a small opening; the right end of the spring piece 8 is provided with a second hook 8.2, which provides an upward elastic force.

[0042] The first hook 8.1 is mounted on the first fixed rod 10 of the lock base 2 and its end extends outward to form a first extension section 8.1.1. This first extension section 8.1.1 abuts against the second fixed rod 11 on the lock base 2, thereby making the middle portion of the spring leaf 8 have upward elasticity, so that the spring leaf 8 always provides an upward elastic force for the lock cylinder 1. The second hook 8.2 abuts or moves away from the positioning rod 9 and its end extends outward to form a second extension section 8.2.1. In the unlocked state, the second hook 8.2 moves away from the positioning rod 9 and the second extension section 8.2.1 abuts against the third fixed rod 12 on the lock cylinder 1. The second extension section 8.2.1 provides an elastic force for the lock cylinder 1 to retract. In the locked state, the second hook 8.2 is mounted outside the positioning rod 9 and provides an elastic force for the lock cylinder 1 to retract. Since the second hook 8.2 is embedded in the positioning rod 9, the lock tongue 7 is now fully engaged in the second through hole 4.1 of the lock plate 4 and locked.

[0043] The middle of the spring leaf 8 is located on the edge of the notch 1.1. The front end of the key 3 abuts against the spring leaf 8 and the side wall of the notch 1.1. Turning the front end of the key 3 simultaneously pushes the spring leaf 8 and the side wall of the notch 1.1. The key 3 can separate the second extension 8.2.1 of the spring leaf 8 from the third fixing rod 12. The width of the front end of the key 3 is greater than the width of a single spring leaf 8 or the width of the side wall of the notch 1.1.

[0044] A step 1.4 is provided on one side of the lock core 1. In the locked state, the step 1.4 abuts against the second fixing rod 11 to position the lock tongue 7 so that the lock tongue 7 is completely embedded in the second through hole 4.1 of the lock plate 4 and cannot retract.

[0045] A positioning block 13 is provided on the lock seat 2, and the side wall of the lock core 1 close to the second positioning groove 1.3 is a first plane 1.5, and the side wall of the positioning block 13 is a second plane 13.1. When the front end of the key 3 is rotated to the position of the first arc surface 1.1.1, the lock core 1 moves up and down based on the contact surface between the second plane 13.1 and the first plane 1.5.

[0046] The upright piano lock of the present invention has three states: unlocked state, unlocked state to locked state, and locked state.

[0047] like Figure 2 and Figure 3 As shown, in the unlocked state, the lock tongue 7 is retracted into the lock seat 2, and the second extension section 8.2.1 of the second hook 8.2 pushes the third fixing rod 12 upward, so that the bottom of the first positioning groove 1.2 abuts against the positioning rod 9, and the lock tongue 7 is retracted into the lock seat 2.

[0048] like Figure 4 and Figure 5As shown, to change from the unlocked state to the locked state: insert the key 3, turn the front end of the key 3, and insert the driver block protruding from the key body 3 in the direction of the first lock hole 5.1. The first turn of the key 3 pushes the side wall of the first arc surface 1.1.1, which in turn pushes the second arc surface 1.1.2 of the notch 1.1, causing the lock cylinder 1 to move further, causing the lock tongue 7 to extend straight outward from the first through hole 2.2 and into the second through hole 4.1 of the lock plate 4. At the same time, the second positioning groove 1.3 separates from the positioning rod 9.

[0049] like Figure 6 and Figure 7 As shown, in the locked state: the front end of the key 3 is turned for the second time, and the third arc surface 1.1.3 of the notch 1.1 is driven to push the lock cylinder 1 to move laterally so that the lock tongue 7 is engaged with the lock door stop 6, and the second hook 8.2 pushes the positioning rod 9 and abuts against the bottom of the second positioning groove 1.3, positioning it in the locked position.

Claims

1. An upright piano lock, comprising a lock core (1), a lock base (2), a key (3) and a lock plate (4); the lock base (2) is embedded in a keyboard cover (5), a first lock hole (5.1) is provided on the front panel of the keyboard cover (5), a second lock hole (2.1) aligned with the first lock hole (5.1) is provided on the front panel of the lock base (2), a first through hole (2.2) is provided on the bottom plate of the lock base (2), the lock core (1) is located in the lock base (2), the front end of the lock core (1) is a lock tongue (7), a notch (1.1) is provided in the center of the lock core (1), a spring sheet (8) is provided in the lock base (2) and is always against the lock core (1), the lock plate (4) is embedded in the lock door stop (6) and a second through hole (4.1) is provided on the top; the front end of the key (3) passes through the first lock hole (5.1) and the second lock hole (2.1) are embedded in the notch (1.1); in the unlocked state, the lock tongue (7) is retracted in the lock seat (2) and is positioned in the unlocked position by the spring sheet (8); the front end of the key (3) is turned for the first time and the lock tongue (7) is pushed to extend straight out of the first through hole (2.2) and into the second through hole (4.1) of the lock plate (4); in the locked state, the front end of the key (3) is turned for the second time and the lock core (1) is pushed to move laterally so that the lock tongue (7) is engaged with the door stop (6) and is positioned in the locked position by the spring sheet (8); the notch (1.1) comprises three smoothly connected arc surfaces, namely the first arc surface (1.1.1), the second arc surface (1.1.2) and the third arc surface (1.1.3), the front end of the key (3) is located on the first arc surface ( When the spring sheet (8) is positioned on the second arc surface (1.1.1), it corresponds to an unlocked state; when the spring sheet (8) is positioned on the second arc surface (1.1.2), the lock tongue (7) extends outward; and when the spring sheet (8) is positioned on the third arc surface (1.1.3), the lock tongue (7) moves laterally and is locked; the spring sheet (8) is arc-shaped, and is provided with a first hook (8.1) at one end and a second hook (8.2) at the other end.

2. The upright piano lock according to claim 1, characterized in that: A first positioning groove (1.2) and a second positioning groove (1.3) are provided on the top of the lock core (1) and on the edge of the notch (1.1); the first positioning groove (1.2) is located between the notch (1.1) and the first positioning groove (1.2); the openings of the first positioning groove (1.2) and the second positioning groove (1.3) face upward; the depth of the second positioning groove (1.3) is greater than the depth of the first positioning groove (1.2); a positioning rod (9) is provided on the lock seat (2); in the unlocked state, the positioning rod (9) abuts against the bottom of the first positioning groove (1.2) and the spring sheet (8) pushes the lock core (1) inward with an elastic force; in the locked state, the positioning rod (9) abuts against the bottom of the second positioning groove (1.3) and the spring sheet (8) pushes the lock core (1) inward with an elastic force.

3. The upright piano lock according to claim 1, characterized in that: The first hook (8.1) is sleeved on the first fixing rod (10) of the lock seat (2) and the end portion extends outward to form a first extension section ( 8.1.1), the first extension section (8.1.1) abuts against the second fixed rod (11) on the lock seat (2), so that the middle part of the spring sheet (8) has elasticity; the second hook (8.2) abuts against or moves away from the positioning rod (9), and the end extends outward to form a second extension section (8.2.1); in the unlocked state, the second hook (8.2) moves away from the positioning rod (9) and the second extension section (8.2.1) abuts against the third fixed rod (12) on the lock core (1), and the second extension section (8.2.1) provides elastic force for the lock core (1) to retract; in the locked state, the second hook (8.2) is sleeved outside the positioning rod (9) and provides elastic force for the lock core (1) to retract.

4. The upright piano lock according to claim 1, characterized in that: The middle of the spring sheet (8) is located on the edge of the notch (1.1), and the front end of the key (3) abuts against the spring sheet (8) and the side wall of the notch (1.1). Turning the front end of the key (3) simultaneously pushes the spring sheet (8) and the side wall of the notch (1.1).

5. The upright piano lock according to claim 1, characterized in that: A step (1.4) is provided on one side of the lock core (1); in the locked state, the step (1.4) abuts against the second fixing rod (11) for positioning.

6. The upright piano lock according to claim 1, characterized in that: A positioning block (13) is provided on the lock seat (2), a side wall of the lock core (1) close to the second positioning groove (1.3) is a first plane (1.5), and a side wall of the positioning block (13) is a second plane (13.1). When the front end of the key (3) is rotated to the position of the first arc surface (1.1.1), the lock core (1) moves up and down based on the contact surface between the second plane (13.1) and the first plane (1.5).

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