An ultrathin electric piano hammer keyboard

Abstract

The application discloses an ultrathin electric piano heavy hammer keyboard, which comprises a bottom plate, a corresponding piano key assembly and a heavy hammer assembly, the piano key assembly comprises a piano key rod movably connected to the bottom plate, the heavy hammer assembly comprises a heavy hammer rod hinged to the bottom plate and swingingly connected with the piano key rod, the heavy hammer rod and the piano key rod are spatially staggered in a vertical direction, the swing track of the heavy hammer rod and the swing track of the piano key rod are staggered and overlapped, and an X-shaped staggered structure is formed. The spatial structure is novel, and the ultrathin advantage is remarkable. The stacking layout mode of the traditional heavy hammer keyboard is broken, the X-shaped spatial staggered structure is adopted, the vertical redundant assembly space is eliminated, the height of the white key in the static state of the keyboard can be controlled to be less than 35 mm, the overall thickness after the key is pressed and stored can be further controlled to be less than 30 mm, and the light and thin assembly and portable use requirements of the ultrathin desktop electric piano and the folding electric piano can be fully met.

Description

Technical Field

[0001] This invention relates to an ultra-thin electric piano hammer-on keyboard. Background Technology

[0002] Traditional weighted digital piano keyboards typically employ a layered layout: the weight mechanism is positioned either above or below the key levers. To achieve the angular acceleration required for optimal playing experience, the weight needs to maintain a sufficiently long lever arm and counterweight mass, resulting in a white key edge height of 70-80 mm, making it unsuitable for ultra-thin, folding portable digital pianos.

[0003] Both of the two conventional improvement approaches in the industry have obvious flaws: 1) Directly eliminate the hammer, use springs or springs to provide all the load, and rely solely on the rotational inertia of the key lever to provide acceleration feedback. There is no secondary lever. Although the damping of light key strikes is retained, the acceleration of heavy key strikes is extremely large, resulting in a floating feel and an inability to obtain the tactile feedback of a hammer keyboard. 2) Reduce the length of the key levers and the weight levers, and increase the weight of the weight laterally. Although this shortens the front-to-back dimensions of the keyboard, the moment of inertia of the weight will be greatly reduced due to the reduction in lever length, and the keys will still not reach the angular acceleration required for normal playing.

[0004] Therefore, an ultra-thin electric piano hammer-on keyboard is proposed to address the above problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the existing defects and provide an ultra-thin electric piano hammer-action keyboard with a novel spatial structure and significant advantages in ultra-thinness.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ultra-thin electric piano weighted keyboard, comprising a chassis, and corresponding key assemblies and weighted hammer assemblies, wherein the key assembly includes a key lever movably connected to the chassis; The counterweight assembly includes a counterweight rod hinged to the chassis and swinging in conjunction with the piano key lever; The weight rod and the key rod are arranged in a spatially staggered manner along the vertical direction, and the swing trajectory of the weight rod and the swing trajectory of the key rod interweave and overlap to form an X-shaped staggered structure.

[0007] Preferably, a hollowed-out groove is formed at the base of the piano key bar, and part of the weight bar passes through the hollowed-out groove and extends below the piano key bar.

[0008] Preferably, the base of the key bar narrows laterally to form an avoidance notch, and the counterweight bar is arranged on the side of the key bar and partially extends below the key bar.

[0009] Preferably, the key levers are white key levers or black key levers, and the plurality of white key levers and black key levers are arranged alternately according to the standard piano keyboard.

[0010] Preferably, the counterweight rod is a slender rod, comprising: The hammer tail is located on the second soft pad connected to the rear end of the top surface of the chassis; the front end of the hammer tail is connected to a metal connecting rod, the front end of the metal connecting rod is connected to a piano key pressing rod, and the front end of the piano key pressing rod is connected to a rubber head; The piano key bar includes: The piano key body has a rear end connected to a piano key connecting piece that forms the pivot point of the piano key rod. The piano key connecting piece is fixedly connected to the front side wall of the first fixed seat. The first fixed seat is installed on the rear end of the top surface of the chassis and is located in front of the second soft pad. The rubber head connected to the front end of the key pressing rod contacts the inside of the key body.

[0011] Preferably, a second fixed seat is fixedly connected to the center of the top surface of the chassis, and a fixed shaft is mounted on the second fixed seat. A latch is opened at the bottom end of the key pressing rod, and the latch is engaged with the fixed shaft.

[0012] Preferably, the height of the front edge of the white keys is no more than 35 mm when the keyboard is stationary after assembly.

[0013] Preferably, the key connecting piece is an elastic plastic sheet.

[0014] Preferably, a vertical positioning plate is connected to the front end of the top of the chassis, and guide plates are connected to both sides of the lower end of the piano key body. The two guide plates are slidably connected to both sides of the positioning plate.

[0015] Preferably, a first soft pad is connected to the top surface of the chassis, and the first soft pad is located below the piano key body.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The ultra-thin electric piano weighted keyboard has a novel spatial structure and a significant advantage in ultra-thinness. It breaks the traditional stacked layout of weighted keyboards with upper and lower layers. Through the X-shaped spatial interlacing structure, redundant assembly space in the vertical direction is eliminated. The height of the white keys in the static state of the keyboard can be controlled within 35 mm. After the keys are pressed down and stored, the overall thickness can be further controlled within 30 mm. It can fully meet the requirements of ultra-thin desktop electric pianos and folding electric pianos for lightweight assembly and portable use.

[0017] The core X-shaped staggered layout can be used to generate two implementation solutions: through slot insertion and side avoidance. The selection can be flexibly made according to the mold development cost, assembly process difficulty and mass production yield, and it can be adapted to the production of products of different grades and different process systems, greatly expanding the product implementation scenarios. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is an isometric view of the ultra-thin electric piano hammer-action keyboard of the present invention; Figure 2 This is a detailed view of the location of the hollowed-out through groove in the present invention; Figure 3 This is a detailed view of the counterweight rod of the present invention; Figure 4 This is a detailed view of the second fixing base of the present invention; Figure 5 This is a detailed view of the location of the gap to be avoided in this invention; Figure 6 This is a schematic diagram of pressing the piano key lever of the present invention.

[0019] In the diagram: 1. Chassis; 2. Key assembly; 3. Weight assembly; 4. Hollowed-out slot; 5. Clearance notch; 6. Hammer tail; 7. Metal connecting rod; 8. Key pressing rod; 9. Key body; 10. Key connecting piece; 11. First fixing seat; 12. Second fixing seat; 13. Fixing shaft; 14. Bayonet; 16. Positioning plate; 17. Guide plate; 18. First soft pad; 19. Rubber head; 20. Second soft pad. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0021] like Figures 1-4 As shown, an ultra-thin electric piano weighted keyboard includes a base 1, and corresponding key assemblies 2 and weight assemblies 3. Key assembly 2 includes key rods movably connected to the base 1; weight assembly 3 includes a weight rod hinged to the base 1 and swinging in conjunction with the key rods. The weight rods and key rods are arranged in a spatially staggered manner along the vertical direction, with the swing trajectories of the weight rods and key rods overlapping to form an X-shaped staggered structure. The weight rods extend into the height range of the key rods, eliminating the redundant vertical space generated by the layered structure of traditional designs. It no longer occupies double the height, resulting in extremely high space utilization.

[0022] After the equipment is assembled, the key rod of the key assembly 2 can swing up and down with the support of the elastic connection structure, and the hammer rod of the hammer assembly 3 swings synchronously with the key rod with the hinge point as the reference. Relying on the X-shaped structure in which the hammer rod and the key rod intersect in the vertical direction, the swing trajectory of the hammer rod and the swing trajectory of the key rod intersect and overlap, breaking the layout limitation of the traditional hammer keyboard keys and hammers being layered vertically, so that the hammer structure is completely integrated into the height range of the key rod.

[0023] A perforated slot 4 is provided at the base of the key bar, through which part of the weight bar passes and extends below the key bar. By providing a perforated slot 4 at the base of the key bar, a through-passage space is provided for the weight bar, allowing part of the weight bar to smoothly pass through the perforated slot 4 and extend into the area below the key bar during swinging. This achieves vertical interlacing between the weight bar and the key bar, ensuring no structural interference during their swinging process and smoothly completing the linkage action.

[0024] The key levers are either white or black key levers, and multiple white and black key levers are arranged alternately according to the standard piano keyboard layout. The following example uses white key levers; the white and black key levers have the same structure. The weight lever is a slender rod, including a hammer tail 6, which is located on a second soft pad 20 connected to the rear end of the top surface of the base 1. The front end of the hammer tail 6 is connected to a metal connecting rod 7, and the front end of the metal connecting rod 7 is connected to a key pressing lever 8. A rubber head 19 is connected to the front end of the key pressing lever 8.

[0025] The piano key lever includes a key body 9, and a key connecting piece 10 is connected to the rear end of the key body 9 to form a pivot point for the key lever's swing. The key connecting piece 10 is fixedly connected to the front side wall of the first fixing seat 11 and is made of elastic plastic. The first fixing seat 11 is installed on the rear end of the top surface of the chassis 1 and is located in front of the second soft pad 20; the rubber head 19 connected to the front end of the key pressing rod 8 contacts the inner side of the key body 9.

[0026] The first soft pad 18 is connected to the top surface of the chassis 1, and the first soft pad 18 is located below the piano key body 9.

[0027] A second fixed seat 12 is fixedly connected to the middle of the top surface of the chassis 1. A fixed shaft 13 is mounted on the second fixed seat 12. A bayonet 14 is opened at the bottom of the piano key pressing rod 8, and the bayonet 14 is engaged with the fixed shaft 13.

[0028] In another embodiment, the swing fulcrum at the rear end of the key body 9 may not use the aforementioned key connecting piece 10, but instead be replaced by a hinge mechanism of pin and bushing: the first fixed seat 11 is provided with a pair of hinged ear seats, the rear end of the key body 9 is provided with a hinged lug, the pin passes through the ear seat and the lug, and the key body 9 swings around the pin to form a rigid rotary swing fulcrum.

[0029] In another embodiment, the key connecting piece 10 is replaced with a metal spring. One end of the metal spring is screwed to the front sidewall of the first fixing seat 11, and the other end is screwed to the rear end of the key body 9. The key swing is achieved by the bending deformation of the metal spring itself, and the deformation of the spring provides the restoring force, which can achieve a fatigue life potential superior to that of plastic sheets.

[0030] Multiple white and black key rods are arranged in an alternating pattern according to the standard piano keyboard, forming a complete keyboard key structure. The rear end of the key body 9 forms an elastic swing fulcrum through the elastic plastic key connecting piece 10. The key connecting piece 10 is fixed on the first fixed base 11, so that the entire key rod can swing up and down elastically around the rear end fulcrum.

[0031] When the key is at rest, the hammer tail 6 rests naturally against the second soft pad 20 at the rear end of the chassis 1, achieving stable positioning and silent support for the hammer structure. During the pressing of the key, the inner side of the key body 9 presses against the rubber head 19, thereby driving the key pressing rod 8, the metal connecting rod 7, and the hammer tail 6 to rotate synchronously around the fixed axis 13, generating rotational inertia due to the counterweight of the distal hammer tail 6. When the key reaches its maximum travel, the bottom of the key body 9 contacts the first soft pad 18 on the chassis 1, achieving downward buffering, positioning, and noise reduction. When the key is released, the elastic restoring force of the elastic key connecting piece 10 and the rotational action of the hammer rod's own gravity drive the key body 9 and the hammer rod to return to their initial resting state, thus completing a complete key pressing and rebound action, achieving a stable, smooth playing effect with a standard hammer feel.

[0032] When the keyboard is assembled and stationary, the height of the front edge of the white keys should not exceed 35 mm. The main counterweight of the hammer mechanism is located at the far end of the lever, relying on a relatively long lever arm to obtain sufficient rotational inertia. This maintains the same key feel as an entry-level digital piano while achieving lightweight parts and a thinner overall design. The height of the white keys after assembly is within 35 mm.

[0033] A vertical positioning plate 16 is connected to the front top of the chassis 1, and guide plates 17 are connected to both sides of the lower end of the key body 9. The two guide plates 17 are slidably connected to both sides of the positioning plate 16. During the up-and-down swinging of the key body 9, the guide plates 17 on both sides of the lower end slide against the sides of the vertical positioning plate 16 to limit the swinging trajectory of the key body 9 in both directions, restricting the left-right offset and lateral wobbling of the key, and ensuring that the key only completes the swinging stroke in the vertical direction. This eliminates the problems of left-right wobbling, offset and jamming during the playing process, improves the stability and accuracy of the key swinging, ensures that each key works independently and does not interfere with each other, and is less prone to misalignment faults during long-term playing. Example

[0034] like Figure 5As shown, the base of the key bar narrows laterally to form an avoidance notch 5, and the counterweight bar is positioned on the side of the key bar and partially extends below it. The counterweight bar's placement on the side of the key bar, without a through-hole, reduces the difficulty of key processing and avoids interference issues during perforation assembly. It also simplifies the key mold and avoids assembly jamming caused by the bar passing through the slot, making it more suitable for mass production.

[0035] This embodiment abandons the through-slot structure and instead creates a clearance notch 5 by narrowing laterally at the root of the key bar, providing lateral clearance space for the counterweight bar. The counterweight bar is positioned on the side of the key bar, with part of its body extending below the key bar, thus achieving a vertically staggered layout of the counterweight bar and the key bar. This ensures that their swing trajectories overlap, completing the linkage counterweight operation. There is no need to create a through-slot in the key bar, significantly simplifying the injection mold structure and processing steps, reducing production costs. It completely avoids potential problems such as assembly jamming, gap noise, and assembly interference caused by through-slotted components, resulting in better structural tolerance and greater suitability for mass production.

[0036] This ultra-thin digital piano features a novel spatial structure and a significant advantage in ultra-thin design. Breaking away from the traditional stacked layout of weighted keyboards, it eliminates redundant vertical assembly space through an X-shaped interlaced structure. This allows the height of the white keys in the static state to be controlled within 35 mm, and the overall thickness can be further controlled within 30 mm after the keys are pressed down for storage. This fully meets the lightweight assembly and portable use requirements of ultra-thin desktop digital pianos and folding digital pianos.

[0037] It adopts a slender hammer rod with remote counterweight, which amplifies the rotational inertia by relying on the long lever arm. Under the premise of achieving lightweight parts and ultra-thin overall design, it can still provide a stable and standard hammer-playing feel, effectively overcoming the industry technical defects of existing ultra-thin keyboards, such as lightness, insufficient counterweight, and poor feel after thinning.

[0038] The core X-shaped staggered layout can be used to generate two implementation solutions: through slot insertion and side avoidance. The selection can be flexibly made according to the mold development cost, assembly process difficulty and mass production yield, and it can be adapted to the production of products of different grades and different process systems, greatly expanding the product implementation scenarios.

[0039] This structure can be directly applied to integrated ultra-thin digital pianos, or it can be adapted to folding piano body structures for matching. It is compatible with the development of multiple types of digital piano products and has broad market application and product extension space.

[0040] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thin electric piano weighted keyboard, comprising a chassis (1), and corresponding key assemblies (2) and weight assemblies (3), characterized in that, The key assembly (2) includes a key bar that is movably connected to the chassis (1); The weight assembly (3) includes a weight rod that is hinged to the chassis (1) and swings in conjunction with the piano key rod; The weight rod and the key rod are arranged in a spatially staggered manner along the vertical direction, and the swing trajectory of the weight rod and the swing trajectory of the key rod interweave and overlap to form an X-shaped staggered structure.

2. The ultra-thin electric piano weighted keypad according to claim 1, characterized in that, A hollowed-out groove (4) is opened at the root of the piano key rod, and part of the hammer rod passes through the hollowed-out groove (4) and extends into the bottom of the piano key rod.

3. The ultra-thin electric piano weighted keypad according to claim 1, characterized in that, The base of the key bar narrows laterally to form a clearance notch (5), and the counterweight bar is arranged on the side of the key bar and partially extends into the underside of the key bar.

4. The ultra-thin electric piano weighted keypad according to claim 1, characterized in that, The key levers are either white key levers or black key levers, and multiple white key levers and black key levers are arranged alternately according to the standard piano keyboard layout.

5. The ultra-thin electric piano weighted keypad according to claim 1, characterized in that, The counterweight rod is a slender rod, comprising: Hammer tail (6), the hammer tail (6) is located on the second soft pad (20) connected to the rear end of the top surface of the chassis (1); the front end of the hammer tail (6) is connected to a metal connecting rod (7), the front end of the metal connecting rod (7) is connected to a piano key pressing rod (8), and the front end of the piano key pressing rod (8) is connected to a rubber head (19). The piano key bar includes: The piano key body (9) is connected to the rear end of the piano key body (9) to form a piano key rod swing fulcrum. The piano key connecting piece (10) is fixedly connected to the front side wall of the first fixed seat (11). The first fixed seat (11) is installed on the rear end of the top surface of the chassis (1) and is located in front of the second soft pad (20). The rubber head (19) connected to the front end of the key pressing rod (8) contacts the inner side of the key body (9).

6. The ultra-thin electric piano weighted keypad according to claim 5, characterized in that, The chassis (1) is fixedly connected to the middle of the top surface of the second fixed seat (12), and a fixed shaft (13) is mounted on the second fixed seat (12). The bottom end of the key pressing rod (8) has a bayonet (14), which is engaged with the fixed shaft (13).

7. The ultra-thin electric piano weighted keypad according to claim 1, characterized in that, When the keyboard is assembled and stationary, the height of the front edge of the white keys should not exceed 35 mm.

8. The ultra-thin electric piano weighted keypad according to claim 5, characterized in that, The key connecting piece (10) is an elastic plastic sheet.

9. The ultra-thin electric piano weighted keypad according to claim 5, characterized in that, The top front end of the chassis (1) is connected to a vertical positioning plate (16), and the lower ends of the piano key body (9) are connected to guide plates (17) on both sides. The two guide plates (17) are slidably connected to the two sides of the positioning plate (16).

10. The ultra-thin electric piano weighted keypad according to claim 5, characterized in that, The first soft pad (18) is connected to the top surface of the chassis (1), and the first soft pad (18) is located below the piano key body (9).

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