Anti-deformation new energy electronic piano

By combining a mounting plate, anti-slip pads, an L-shaped protective plate, and a positioning mechanism, the problems of unstable positioning and inconvenient height adjustment in electronic pianos are solved, achieving stable support and sound quality protection for the piano.

CN223461995UActive Publication Date: 2025-10-21CHONGQING SIWEITE PIANO
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Patent Information

Application Number
CN202422069501.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-26
Publication Date
2025-10-21
Estimated Expiration
2034-08-26

AI Technical Summary

Technical Problem

Existing electronic pianos lack positioning and protection mechanisms, making them prone to tilting, falling, and deformation due to impacts. Furthermore, the operating height is inconvenient to adjust, and the center plate is susceptible to moisture, bending, and deformation, affecting sound quality.

Method used

The system employs a combination of mounting plate, anti-slip pad, L-shaped protective plate, fixing box, and positioning mechanism. The piano is fixed by the positioning mechanism, and combined with height adjustment and reinforcement components, it achieves stable support and height adjustment for the piano.

Benefits of technology

It effectively prevents the piano from tilting, falling, or deforming, improves the convenience of height adjustment, prevents the middle plate from bending or deforming, and ensures stable sound quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses an anti-deformation new energy electronic piano, which relates to the technical field of new energy electronic pianos and comprises a new energy electronic piano and a mounting plate. The bottom of the new energy electronic piano is arranged at the top of an anti-skid pad, an L-shaped protection plate is fixedly connected to the rear side of the top of the mounting plate, a music score support is fixedly connected to the middle side of the top of the L-shaped protection plate, a positioning mechanism is arranged at the left end of the fixing box, and the right end of the outer wall of the positioning mechanism penetrates to the right end of the fixing box. Height adjusting assemblies are arranged at the positions, close to the four corners, of the bottom of the mounting plate correspondingly, and reinforcing assemblies are arranged at the positions, close to the front side and the rear side of the fixing box, of the bottom of the mounting plate correspondingly. The new energy electronic piano is placed on the non-slip mat, and then the left side and the right side of the new energy electronic piano are positioned and fixed by operating the positioning mechanism, so that the new energy electronic piano is fixed on the mounting plate.
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Description

TECHNICAL FIELD

[0001] The utility model relates to new energy electronic piano technical field, concretely relates to a kind of anti-deformation new energy electronic piano. BACKGROUND

[0002] New energy, also known as unconventional energy, refers to various forms of energy other than traditional energy. It refers to energy that is just beginning to be developed and utilized or is being actively researched and needs to be promoted, such as solar energy, geothermal energy, wind energy, ocean energy, biomass energy, and nuclear fusion energy. The electric piano is an electronic musical instrument. The principle of sound production of the electric piano is to use the keyboard as a on-off switch to form an electric pulse. Once the piano key is pressed, the internal crystal oscillator starts to work, forming a pulse to generate a certain frequency waveform. Then, after amplification by the frequency divider, it is sent to the loudspeaker to produce sound. The entire sound production process relies on a simple frequency division analog circuit, so the keyboard has no dynamics and chord striking feeling, and the sound is relatively mechanical and monotonous. The new energy electronic piano mainly uses solar photovoltaic power generation as the power supply for the electronic piano. The existing technology has the following problems:

[0003] The existing electronic piano can be used by simply placing it on a table. However, the traditional table lacks a positioning and protection mechanism for the electronic piano, making it vulnerable to impact and causing the electronic piano to tilt and fall, leading to deformation. In addition, the operating height of the electronic piano is not easy to adjust during use, and the middle plate body of the piano lacks a fixing structure. The piano middle plate body is easily bent and deformed due to moisture and other external factors, which seriously affects the piano's pitch and sound quality. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of anti-deformation new energy electronic piano to solve the problems existing in the above background technology.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A kind of anti-deformation new energy electronic piano, including new energy electronic piano and mounting plate, the top of the new energy electronic piano is fixedly connected with non-slip pad, the bottom of the new energy electronic piano is arranged at the top of non-slip pad, the top rear side of the mounting plate is fixedly connected with L-shaped protection plate, the top middle side of the L-shaped protection plate is fixedly connected with music stand support, the bottom middle side of the mounting plate is fixedly connected with fixed box, the left end of the fixed box is provided with positioning mechanism, and the outer wall right end of the positioning mechanism penetrates to the right end of the fixed box, the bottom of the mounting plate is close to four corners and is provided with height adjusting assembly respectively, the front and back sides of the mounting plate bottom close to fixed box are provided with reinforcing assembly respectively.

[0007] The further improvement of the utility model technical scheme lies in: the positioning mechanism includes two -way screw rod, the left end fixedly connected with knob one of two -way screw rod, the outer wall right end of two -way screw rod is connected with bearing and rotates to the right -hand end of fixed box and reaches, the right -hand end of fixed box is fixedly connected with the one end of bearing, the outer wall left and right sides of two -way screw rod are screw -threaded with the moving block of equal spacing respectively, the top middle side of two moving blocks is fixedly connected with the connecting plate, the top of two connecting plates is fixedly connected with the clamping plate, the front and back sides of two clamping plate top are fixedly connected with the anti -drop claw of preventing respectively, the inner wall of four anti -drop claw is all provided with rubber pad.

[0008] The further improvement of the utility model technical scheme lies in: the positioning mechanism includes two -way screw rod, the left end fixedly connected with knob one of two -way screw rod, the outer wall right end of two -way screw rod is connected with bearing and rotates to the right -hand end of fixed box and reaches, the right -hand end of fixed box is fixedly connected with the one end of bearing, the outer wall left and right sides of two -way screw rod are screw -threaded with the moving block of equal spacing respectively, the top middle side of two moving blocks is fixedly connected with the connecting plate, the top of two connecting plates is fixedly connected with the clamping plate, the front and back sides of two clamping plate top are fixedly connected with the anti -drop claw of preventing respectively, the inner wall of four anti -drop claw is all provided with rubber pad.

[0009] The further improvement of the utility model technical scheme lies in: the positioning mechanism includes two -way screw rod, the left end fixedly connected with knob one of two -way screw rod, the outer wall right end of two -way screw rod is connected with bearing and rotates to the right -hand end of fixed box and reaches, the right -hand end of fixed box is fixedly connected with the one end of bearing, the outer wall left and right sides of two -way screw rod are screw -threaded with the moving block of equal spacing respectively, the top middle side of two moving blocks is fixedly connected with the connecting plate, the top of two connecting plates is fixedly connected with the clamping plate, the front and back sides of two clamping plate top are fixedly connected with the anti -drop claw of preventing respectively, the inner wall of four anti -drop claw is all provided with rubber pad.

[0010] The further improvement of the utility model technical scheme lies in: the positioning mechanism includes two -way screw rod, the left end fixedly connected with knob one of two -way screw rod, the outer wall right end of two -way screw rod is connected with bearing and rotates to the right -hand end of fixed box and reaches, the right -hand end of fixed box is fixedly connected with the one end of bearing, the outer wall left and right sides of two -way screw rod are screw -threaded with the moving block of equal spacing respectively, the top middle side of two moving blocks is fixedly connected with the connecting plate, the top of two connecting plates is fixedly connected with the clamping plate, the front and back sides of two clamping plate top are fixedly connected with the anti -drop claw of preventing respectively, the inner wall of four anti -drop claw is all provided with rubber pad.

[0011] The further improvement of the utility model technical scheme lies in: the positioning mechanism includes two -way screw rod, the left end fixedly connected with knob one of two -way screw rod, the outer wall right end of two -way screw rod is connected with bearing and rotates to the right -hand end of fixed box and reaches, the right -hand end of fixed box is fixedly connected with the one end of bearing, the outer wall left and right sides of two -way screw rod are screw -threaded with the moving block of equal spacing respectively, the top middle side of two moving blocks is fixedly connected with the connecting plate, the top of two connecting plates is fixedly connected with the clamping plate, the front and back sides of two clamping plate top are fixedly connected with the anti -drop claw of preventing respectively, the inner wall of four anti -drop claw is all provided with rubber pad.

[0012] The further improvement of the utility model technical scheme lies in: the positioning mechanism includes two -way screw rod, the left end fixedly connected with knob one of two -way screw rod, the outer wall right end of two -way screw rod is connected with bearing and rotates to the right -hand end of fixed box and reaches, the right -hand end of fixed box is fixedly connected with the one end of bearing, the outer wall left and right sides of two -way screw rod are screw -threaded with the moving block of equal spacing respectively, the top middle side of two moving blocks is fixedly connected with the connecting plate, the top of two connecting plates is fixedly connected with the clamping plate, the front and back sides of two clamping plate top are fixedly connected with the anti -drop claw of preventing respectively, the inner wall of four anti -drop claw is all provided with rubber pad.

[0013] The further improvement in the technical scheme of the utility model lies in that: the inner wall of the fixed groove is provided with a sliding groove on the left side and the right side respectively, sliding blocks are fixedly connected to the top of the outer wall of the left end and the right end of the moving column respectively, the outer wall of the sliding block is in sliding connection with the inner wall of the fixed groove, and the outer wall of the supporting column close to the upper side of the fixed groove is fixedly connected with the inner wall of the fixed ring.

[0014] Due to the adoption of the above technical scheme, the utility model has the following technical progress compared with the prior art:

[0015] 1. The anti-deformation new energy electronic piano is fixed on the mounting plate by placing the new energy electronic piano on the anti-skid pad and then positioning and fixing the left and right sides of the new energy electronic piano by operating the positioning mechanism, so that the problem of deformation caused by the inclination of the electronic piano due to impact is solved, and the beneficial effects of limiting and fixing the new energy electronic piano and avoiding the inclination of the electronic piano due to impact are achieved.

[0016] 2. The anti-deformation new energy electronic piano is fixed on the mounting plate by placing the new energy electronic piano on the anti-skid pad and then positioning and fixing the left and right sides of the new energy electronic piano by operating the positioning mechanism, so that the problem of deformation caused by the inclination of the electronic piano due to impact is solved, and the beneficial effects of limiting and fixing the new energy electronic piano and avoiding the inclination of the electronic piano due to impact are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional structure schematic diagram of the anti-deformation new energy electronic piano of the utility model;

[0018] Figure 2 It is a three-dimensional structure schematic diagram of the positioning mechanism of the utility model;

[0019] Figure 3 It is a three-dimensional structure schematic diagram of the positioning mechanism of the utility model;

[0020] Figure 4 It is a three-dimensional structure schematic diagram of the positioning mechanism of the utility model;

[0021] Figure 5 The utility model discloses a height adjusting assembly three-dimensional structure schematic diagram.

[0022] In the drawing: 1, new energy electronic piano, 2, mounting plate, 3, non-slip pad, 4, L-shaped protection plate, 5, music stand, 6, fixed box, 7, positioning mechanism, 71, bidirectional screw rod, 710, locating block, 72, knob one, 73, bearing, 74, moving block, 75, connecting plate, 751, limit block, 76, clamping plate, 77, anti-dropping claw, 78, rubber pad, 8, height adjusting assembly, 81, support column, 810, fixed groove, 811, jack, 812, sliding slot, 82, moving column, 820, screw groove, 821, sliding block, 83, fixed foot pad, 84, screw rod, 85, knob two, 851, rubber ring, 9, reinforcing assembly, 91, reinforcing steel plate, 92, support bracket, 93, fixed ring, 10, moving slot, 1001, limit slot. DETAILED DESCRIPTION

[0023] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments:

[0024] As Figure 1 shown, the utility model provides a kind of anti-deformation new energy electronic piano, including new energy electronic piano 1 and mounting plate 2, the top of new energy electronic piano 1 is fixedly connected with non-slip pad 3, and the bottom of new energy electronic piano 1 is arranged at the top of non-slip pad 3, and the top rear side of mounting plate 2 is fixedly connected with L-shaped protection plate 4, and the top middle side of L-shaped protection plate 4 is fixedly connected with music stand 5, and the bottom middle side of mounting plate 2 is fixedly connected with fixed box 6, and the left end of fixed box 6 is provided with positioning mechanism 7, and the outer wall right end of positioning mechanism 7 is penetrated to the right end of fixed box 6, and the bottom of mounting plate 2 is close to four corners and is respectively provided with height adjusting assembly 8, and the front and rear sides of mounting plate 2 bottom close to fixed box 6 are respectively provided with reinforcing assembly 9;

[0025] setting mounting plate 2, non-slip pad 3, L-shaped protection plate 4, fixed box 6, positioning mechanism 7, height adjusting assembly 8 and reinforcing assembly 9, new energy electronic piano 1 is placed on non-slip pad 3, and positioning mechanism 7 is operated to position and clamp the two ends of new energy electronic piano 1, so that new energy electronic piano 1 is fixed on mounting plate 2, to avoid that new energy electronic piano 1 is inclined after being impacted, which can cause accidental falling and deformation, reinforcing assembly 9 is arranged to reinforce and support the middle disc of new energy electronic piano 1, to avoid that the middle disc body of piano is bent and deformed due to damp and other external factors.

[0026] As Figure 2The utility model provides a kind of anti-deformation new energy electronic piano technical scheme shown in the utility model: positioning mechanism 7 includes two-way screw rod 71, the left end of two-way screw rod 71 is fixedly connected with knob one 72, the outer wall right end of two-way screw rod 71 is fixed box 6 right end and rotationally connected with bearing 73, one end of bearing 73 is fixedly connected with the right end of fixed box 6, the outer wall left and right sides of two-way screw rod 71 are threadedly connected with the moving block 74 of equal spacing, the top middle side of two moving blocks 74 is fixedly connected with connecting plate 75, by rotating two-way screw rod 71, moving block 74 is moved along the thread on two-way screw rod 71, the two ends of new energy electronic piano 1 are clamped and positioned, the top of two connecting plates 75 is fixedly connected with clamping plate 76, the front and back sides of the top of two clamping plates 76 are fixedly connected with anti-drop claw 77, the inner wall of four anti-drop claws 77 is all provided with rubber pad 78, setting clamping plate 76, anti-drop claw 77 and rubber pad 78, the surface of the two ends of new energy electronic piano 1 is abutted by clamping plate 76, anti-drop claw 77 is clamped and fixed to the surface of new energy electronic piano 1 by rubber pad 78, the left and right sides of the top of mounting plate 2 and non-slip pad 3 are respectively provided with the moving groove 10 that passes through up and down, the outer wall top of two connecting plates 75 is penetrated to the upper end of moving groove 10, the lower surface of clamping plate 76 is overlapped with the upper surface of non-slip pad 3.

[0027] As Figure 3 The utility model provides a kind of anti-deformation new energy electronic piano technical scheme shown in the utility model: two-way screw rod 71 is fixedly connected with positioning block 710 on the opposite face of the thread of two sides, positioning block 710 positions the moving distance of moving block 74, the front and back ends of two moving grooves 10 close to connecting plate 75 are respectively provided with limit slot 1001, the left and right ends of two connecting plates 75 are respectively fixedly connected with limit block 751, the outer wall of limit block 751 is slidably connected with the inside of limit slot 1001, limit block 751 is slippage in limit slot 1001, and the movement track of clamping plate 76 is limited.

[0028] As Figure 4 The utility model provides a kind of anti-deformation new energy electronic piano technical scheme shown in the utility model: reinforcing assembly 9 includes reinforcing steel plate 91, two support brackets 92 and two fixed rings 93, one end of two support brackets 92 is respectively fixedly connected in the left and right ends of reinforcing steel plate 91 bottom, the other end of two support brackets 92 is respectively fixedly connected with the opposite face of the outer wall of two fixed rings 93, the top of reinforcing steel plate 91 is fixedly connected in mounting plate 2 bottom close to the side of fixed box 6, and is supported between reinforcing steel plate 91 bottom two sides and height adjusting assembly 8 by support bracket 92, and reinforcing steel plate 91 is fixedly supported to the middle disc of new energy electronic piano 1.

[0029] As Figure 5The utility model provides a kind of anti-deformation new energy electronic piano technical scheme shown: height adjusting assembly 8 includes support column 81, moving column 82, fixed foot pad 83 and screw rod 84, the top of support column 81 is fixedly connected in the bottom of mounting plate 2, the bottom of support column 81 is equipped with fixed groove 810, the outer wall of moving column 82 is connected with the inside of fixed groove 810, the bottom of moving column 82 is fixedly connected in the top of fixed foot pad 83, the front end of fixed groove 810 is equipped with several inside and outside through insertion hole 811 at equal intervals, the upper side of the outer wall of the front end of moving column 82 is equipped with screw groove 820, the front end of screw rod 84 is fixedly connected with knob two 85, the rear surface of knob two 85 is fixedly connected with rubber ring 851, the rear end of the outer wall of screw rod 84 is connected with the inside of screw groove 820 by insertion hole 811, screw rod 84 is screwed into the inside of screw groove 820 by fixed groove 810, so that it is convenient to adjust the height of mounting plate 2, the inner wall of fixed groove 810 is equipped with sliding groove 812 respectively on left and right sides, the top of the outer wall of moving column 82 left and right ends is fixedly connected with sliding block 821 respectively, the outer wall of sliding block 821 is connected with the inner wall of fixed groove 810 slidingly, sliding block 821 is slid in the inside of sliding groove 812, play the role of limiting the movement of moving column 82, the inner wall of fixed ring 93 is fixedly connected with the upper side of the outer wall of support column 81 close to fixed groove 810, fixed in support column 81 by fixed ring 93, play the role of supporting and connecting to reinforced steel plate 91.

[0030] The working principle of the anti-deformation new energy electronic piano will be described in detail below.

[0031] As Figures 1-5As shown, when the new energy electronic piano 1 of the prior art is installed and used, first, the knob two 85 drives the screw rod 84 to be separated from the inside of the moving column 82, then the moving column 82 is moved up or down along the inside of the fixed groove 810, so that the mounting plate 2 is adjusted to the appropriate height, the threaded groove 820 is aligned with the corresponding jack 811, then the screw rod 84 is inserted into the threaded groove 820 through the jack 811, and the screw rod 84 is screwed into the inside of the threaded groove 820 by rotating the knob two 85 to fix it, and the rubber ring 851 is attached to the outer wall of the support column 81 to improve the stability of the fixation, then the new energy electronic piano 1 is placed on the surface of the non-slip pad 3, the friction between the bottom of the new energy electronic piano 1 and the surface of the non-slip pad 3 is increased, and then the knob one 72 is rotated to drive the bidirectional screw rod 71 to rotate, so that the moving block 74 on both sides of the bidirectional screw rod 71 is synchronously moved close to each other, and the connecting plate 75 slides along the limiting groove 1001 in the moving groove 10 in the process, limiting the movement track of the clamping plate 76, so that the clamping plate 76 on both sides clamps the left and right ends of the new energy electronic piano 1, the anti-dropping claw 77 is clamped and positioned on the surface of the left and right ends of the new energy electronic piano 1 through the rubber pad 78, and the L-shaped protective plate 4 is combined to effectively protect the outside of the new energy electronic piano 1, avoid being hit, and make the electronic piano tilt to cause accidental falling and deformation. During use of the new energy electronic piano 1, two reinforcing steel plates 91 are arranged on the bottom of the mounting plate 2, and the reinforcing steel plates 91 are upwardly abutted by the supporting bracket 92, thereby improving the reinforcing effect of the reinforcing steel plates 91, supporting and fixing the middle disc of the new energy electronic piano 1 on the mounting plate 2, and avoiding bending and deformation of the middle disc of the new energy electronic piano 1.

[0032] The specific type and structure of the new energy electronic piano 1 used are existing products, and the specific circuit connection structure and control relationship of the new energy electronic piano 1 are prior art, which will not be described in detail here.

[0033] The above is a detailed description of the general application, but some modifications or improvements can be made on the basis of the application, which is obvious to those skilled in the art. Therefore, without departing from the spirit of the application, the modifications or improvements are within the scope of the application.

Claims

1. A deformation-resistant new energy electronic piano, comprising a new energy electronic piano (1) and a mounting plate (2), characterized in that: The top of the new energy electronic piano (1) is fixedly connected with a non-slip pad (3), the bottom of the new energy electronic piano (1) is arranged at the top of the non-slip pad (3), the top rear side of the mounting plate (2) is fixedly connected with an L-shaped protection plate (4), the top middle side of the L-shaped protection plate (4) is fixedly connected with a music stand (5), the bottom middle side of the mounting plate (2) is fixedly connected with a fixed box (6), the left end of the fixed box (6) is provided with a positioning mechanism (7), and the outer wall right end of the positioning mechanism (7) penetrates to the right end of the fixed box (6), and the bottom of the mounting plate (2) near the four corners is respectively provided with a height adjusting assembly (8), and the front and rear sides of the mounting plate (2) near the fixed box (6) are respectively provided with a reinforcing assembly (9).

2. The anti-deformation new energy electronic piano according to claim 1, characterized in that: The positioning mechanism (7) comprises a bidirectional screw rod (71), the left end of the bidirectional screw rod (71) is fixedly connected with a knob (72), the outer wall right end of the bidirectional screw rod (71) penetrates to the right end of the fixed box (6) and is rotatably connected with a bearing (73), one end of the bearing (73) is fixedly connected with the right end of the fixed box (6), the outer wall left and right sides of the bidirectional screw rod (71) are respectively threadedly connected with movable blocks (74) with equal spacing, the top middle side of the two movable blocks (74) is fixedly connected with a connecting plate (75), the top of the two connecting plates (75) is fixedly connected with a clamping plate (76), the front and rear sides of the top of the two clamping plates (76) are respectively fixedly connected with anti-dropping claws (77), and the inner wall of the four anti-dropping claws (77) is provided with a rubber pad (78).

3. The anti-deformation new energy electronic piano according to claim 2, characterized in that: The left and right sides of the top of the mounting plate (2) and the non-slip pad (3) are respectively provided with a moving groove (10) penetrating in the up-down direction, the outer wall top of the two connecting plates (75) penetrates to the upper end of the moving groove (10), and the lower surface of the clamping plate (76) is lapped with the upper surface of the non-slip pad (3).

4. The anti-deformation new energy electronic piano according to claim 3, characterized in that: The opposite faces of the bidirectional screw rod (71) near the two sides of the thread are fixedly connected with positioning blocks (710), the front and rear ends of the two moving grooves (10) near the connecting plates (75) are respectively provided with limiting grooves (1001), and the left and right ends of the two connecting plates (75) are respectively fixedly connected with limiting blocks (751).

5. The anti-deformation new energy electronic piano according to claim 1, characterized in that: The reinforcing assembly (9) comprises a reinforcing steel plate (91), two supporting brackets (92) and two fixing rings (93), one end of the two supporting brackets (92) is fixedly connected with the left and right ends of the bottom of the reinforcing steel plate (91), and the other end of the two supporting brackets (92) is fixedly connected with the opposite faces of the outer walls of the two fixing rings (93).

6. The anti-deformation new energy electronic piano according to claim 5, characterized in that: The top of the reinforcing steel plate (91) is fixedly connected with one side of the bottom of the mounting plate (2) near the fixed box (6).

7. The anti-deformation new energy electronic piano according to claim 1, characterized in that: The height adjusting component (8) comprises a support column (81), a moving column (82), a fixed foot pad (83) and a screw rod (84), the top of the support column (81) is fixedly connected to the bottom of the mounting plate (2), the bottom of the support column (81) is provided with a fixed groove (810), the outer wall of the moving column (82) is sleeved with the inner part of the fixed groove (810), the bottom of the moving column (82) is fixedly connected to the top of the fixed foot pad (83), the front end of the fixed groove (810) is provided with a plurality of plug holes (811) which are internally and externally through, the upper side of the front end outer wall of the moving column (82) is provided with a threaded groove (820), the front end of the screw rod (84) is fixedly connected with a knob two (85), the rear surface of the knob two (85) is fixedly connected with a rubber ring (851), and the outer wall rear end of the screw rod (84) is internally and threadedly connected with the plug hole (811) and the threaded groove (820).

8. The anti-deformation new energy electronic piano according to claim 7, characterized in that: The inner wall of the fixed groove (810) is provided with a sliding groove (812) on the left and right sides, respectively, the top of the outer wall of the moving column (82) is fixedly connected with a sliding block (821) on the left and right ends, respectively, the outer wall of the sliding block (821) is slidingly connected with the inner wall of the fixed groove (810), and the outer wall of the support column (81) is fixedly connected with the inner wall of the fixed ring (93) on the upper side close to the fixed groove (810).