Rack mechanism capable of guiding keyboard cover to be opened or closed autonomously
By incorporating a bend and guide groove at one-third of the rack of the electric piano, the problem of poor keyboard cover user experience was solved, enabling automatic opening or closing, improving stability and smoothness, and reducing noise.
Patent Information
- Application Number
- CN202423299420.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The existing keyboard cover structure of electric pianos has a poor user experience due to the design of the rack tilt direction. If the rack tilts forward, the key cover closes smoothly but requires additional locking to open. If the rack tilts backward, it opens smoothly but requires manual pulling to close.
A bend is set at 1/3 of the rack to create a downward slope. The gear at the rear of the key cover can slide freely after passing the bend, using gravity to maintain the open or closed state. Combined with guide grooves and buffer pads, noise is reduced and stable movement is ensured.
It enables the keyboard cover to open or close automatically, improving the user experience, avoiding extra operations, improving operational stability and smoothness, and reducing noise.
Smart Images
Figure CN223770818U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of piano parts technology, and in particular to a rack and pinion mechanism that can guide the keyboard cover to open or close autonomously. Background Technology
[0002] Many digital pianos on the market use a pull-out key cover. Its structural feature is that two gears on either side of the rear of the key cover mesh with a rack on the inner side arm. The two gears are connected by a long shaft and rotate synchronously to achieve forward and backward movement. Currently, all racks with similar structures are straight racks. The drawback of this structure lies in determining the direction of the rack's tilt: if the rack tilts forward, the key cover closes smoothly, but an additional locking mechanism is needed to keep the key cover stable after opening; if the rack tilts backward, the key cover remains stable after opening, but the entire closing process requires manual pulling, resulting in a less than ideal user experience. Summary of the Invention
[0003] The technical problem to be solved by this utility model is to provide a rack and pinion mechanism that can guide the keyboard cover to open or close autonomously. A bend is set at about 1 / 3 of the rack and the bend extends downhill to both ends of the rack. After the rear gear of the keyboard cover passes through the bend, it can slide freely forward or backward. After sliding to the end point, it can stably maintain the open or closed state due to gravity. The opening or closing process only requires manual pushing / pulling of the keyboard cover past the highest point of the rack. The rest of the operation can be completed by the keyboard cover under gravity.
[0004] The technical solution adopted by this utility model to solve its technical problem is: to provide a rack mechanism that can guide the keyboard cover to open or close autonomously, including a rack base plate, a rack and a guide groove. The rack is installed in the middle of one side of the rack base plate. The tooth surface of the rack faces upward and the tooth surface protrudes upward near the middle. The upper part of the side of the rack base plate where the rack is installed is provided with a guide groove parallel to the tooth surface of the rack.
[0005] In this technical solution, a rack and pinion base is provided to facilitate docking with both sides of the piano key mounting base. The rack also facilitates the movement of the piano key cover. Furthermore, upward-protruding toothed nodes create two inclined toothed structures on the rack. One inclined surface moves the key cover backward, and the other moves it forward. When the key cover needs to be opened, the user pushes it past the protruding node, and the key cover, under its own weight, moves along the inclined toothed surface, allowing it to open automatically. This inclined surface also ensures that the key cover will not slip forward due to external force. Conversely, when the key cover needs to be closed, the user pulls it forward; once past the protruding node, the key cover, under its own weight, slowly and automatically closes.
[0006] Meanwhile, this technical solution includes a guide groove, which is formed in the same way as the rack and pinion, and the two are in a parallel state to guide the key cover to move stably.
[0007] As a supplement to this technical solution, buffer pads are embedded in both ends of the guide groove. In this technical solution, buffer pads are used to reduce the noise generated during the operation of the key cover and to avoid excessive impact.
[0008] As a supplement to this technical solution, the upper protrusion of the rack is located at one-third of the rack, thus forming two inclined rack surfaces of different lengths. By designing the protrusion at one-third of the rack, the operating characteristics of the key cover can be controlled. The shorter inclined rack surface is mainly used to facilitate the opening of the keys. At the same time, the slope of this inclined rack surface is relatively steep, which can prevent the key cover from slipping due to external impact. The longer inclined rack surface, as a gentle slope, is mainly used to facilitate the closing of the keys and prevent excessive impact force when the key cover closes.
[0009] As a supplement to this technical solution, an insertion notch is provided at the highest point of the upper side wall of the guide groove to facilitate the insertion of the key cover.
[0010] As a supplement to this technical solution, an arc-shaped transition section is provided at the highest point of the lower side wall of the guide groove, which makes the key cover run more smoothly.
[0011] As a supplement to this technical solution, the rack is equipped with a gear that meshes with it, and the gear is provided with a rolling bushing that is inserted into a guide groove. By setting the rolling bushing to match the guide groove, the running accuracy and running stability between the two are ensured.
[0012] Beneficial effects: This utility model relates to a rack and pinion mechanism that can guide the keyboard cover to open or close autonomously, and has the following advantages:
[0013] (1) The key cover will automatically slide to the open position after being opened to a certain extent, improving the user experience;
[0014] (2) After the key cover is opened, the gear on the key cover is located at the bottom of the rack slope, which can keep the key cover open stably and will not fall back due to vibration or tilt.
[0015] (3) When the key cover is closed, you only need to control the key cover to move forward a certain distance and it will slide to the closed position automatically without manual intervention, thus improving the user experience;
[0016] (4) Facilitates the opening and closing of the key cover, improves the stability and smoothness of the key cover operation, and facilitates the installation of the key cover. Attached Figure Description
[0017] Figure 1 This is a structural view of the present invention in use;
[0018] Figure 2 This is a structural view of the present invention;
[0019] Figure 3 This is a structural view of the gear described in this utility model.
[0020] Illustration: 1. Rack base plate, 2. Rack, 3. Guide groove, 4. Insertion notch, 5. Key cover, 6. Shaft mounting base, 7. Shaft, 8. Gear, 9. Buffer pad, 10. Arc transition section, 11. Rolling bushing. Detailed Implementation
[0021] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.
[0022] The embodiments of this utility model relate to a rack and pinion mechanism that can guide the keyboard cover to open or close autonomously, such as... Figure 1 As shown in Figure 3, the device includes a rack base plate 1, a rack 2, and a guide groove 3. The rack 2 is mounted on the middle of one side of the rack base plate 1. The tooth surface of the rack 2 faces upward and protrudes upward near the middle of the tooth surface. A guide groove 3 parallel to the tooth surface of the rack 2 is provided on the upper part of the side of the rack base plate 1 on which the rack 2 is mounted.
[0023] In this technical solution, a rack base plate 1 is provided to facilitate docking with both sides of the piano key mounting base. A rack 2 is also provided to facilitate the movement of the piano key cover. An upwardly protruding toothed surface node is provided to create two inclined toothed surface structures on the rack 2. One inclined surface acts as a ramp that moves the key cover 5 backward, and the other as a ramp that moves the key cover 5 forward. When the key cover 5 needs to be opened, the user pushes the key cover 5 past the protruding node, and the key cover 5 will move along the inclined toothed surface by its own weight, allowing the key cover 5 to open automatically. This inclined surface also ensures that the key cover 5 will not slip forward due to external force. When the key cover 5 needs to be closed, the user pulls the key cover 5 forward; once it passes the protruding node, the key cover 5 will slowly and automatically close by its own weight.
[0024] Meanwhile, this technical solution includes a guide groove 3, which is formed in the same way as the rack 2, and the two are in a parallel state to guide the key cover 5 to move stably.
[0025] As a supplement to this technical solution, buffer pads 9 are embedded in both ends of the guide groove 3. In this technical solution, buffer pads 9 are used to reduce the noise generated during the operation of the key cover 5 and to avoid excessive impact.
[0026] As a supplement to this technical solution, the upper protrusion of the rack 2 is located at one-third of the rack 2, thus forming two inclined rack surfaces of different lengths. By designing the protrusion at one-third of the rack surface, the operating characteristics of the key cover 5 can be controlled. The shorter inclined rack surface is mainly used to facilitate the opening of the piano keys. At the same time, the slope of the inclined rack surface is relatively steep, which can prevent the key cover 5 from slipping due to external impact. The longer inclined rack surface, as a gentle slope, is mainly used to facilitate the closing of the piano keys and prevent excessive impact force when the key cover 5 is closed.
[0027] As a supplement to this technical solution, an insertion notch 4 is provided at the highest point of the upper side wall of the guide groove 3. The insertion notch 4 is provided to facilitate the insertion of the key cover 5.
[0028] As a supplement to this technical solution, an arc-shaped transition portion 10 is provided at the highest point of the lower side wall of the guide groove 3, which makes the key cover 5 run more smoothly.
[0029] As a supplement to this technical solution, the rack 2 is equipped with a gear 8 that meshes with it, and the gear 8 is provided with a rolling bushing 11 that is inserted into the guide groove 3. By setting the rolling bushing 11 to match the guide groove 3, the running accuracy and running stability between the two are ensured.
[0030] Example
[0031] During installation, the device consists of two symmetrically mounted pieces on the inner sides of the key base. The steeper bevel of the two tooth surfaces on the rack 2 is located at the rear. Several pivot mounting seats 6 are installed side-by-side at the rear end of the key cover 5. A pivot 7 is laterally mounted within each pivot mounting seat 6. Gears 8 are fixedly mounted on both ends of the pivot 7. The gears 8 and rolling bushings 11 are integral components, so that the ends of the pivot 7 are wrapped with the rolling bushings 11. During installation, the rolling bushings 11 are inserted into the guide groove 3 through the insertion notch 4. After installation, it is necessary to ensure that the teeth of the gears 8 and rack 2 are fully engaged. Lubricant is then applied to the gears 8 and guide groove 3 to ensure smoother operation of the key cover 5.
[0032] When the key cover 5 is open: manually lift it upwards and then push it backwards. When the gear 8 at the rear of the key cover 5 passes the highest point of the rack 2, the key cover 5 can slide down to the fully open position on its own. At this time, the gear 8 at the rear of the key cover 5 is at the lowest position behind the rack 2, which can keep the key cover 5 in a stable open state.
[0033] When the key cover 5 is closed: Manually pull the key cover 5 forward. When the rear gear 8 of the key cover 5 passes the highest point of the rack 2, the key cover 5 begins to slide down to the end point on its own. At this time, the rear gear 8 of the key cover 5 is located at the lowest position in front of the rack 2, which can keep the key cover 5 in the closed state.
Claims
1. A rack mechanism that can guide a keyboard cover to be opened or closed autonomously, characterized by: The utility model relates to a kind of rack and pinion gears, including rack base plate (1), rack (2) and guide slot (3), the rack (2) is installed in the middle part of one side of the rack base plate (1), the tooth surface of the rack (2) is upward, and tooth surface is upward protruding near middle part, the rack base plate (1) is provided with the guide slot (3) parallel with the tooth surface of rack (2) on the upper portion of the side of rack (2) installation.
2. The rack mechanism capable of guiding the keyboard cover to be opened or closed autonomously according to claim 1, characterized in that: The both ends of the guide slot (3) are embedded with buffer pad (9).
3. The rack mechanism capable of guiding the keyboard cover to be opened or closed autonomously according to claim 1, characterized in that: The upper protruding point of the rack (2) is located at one third position of the rack (2), thereby forming two inclined rack surfaces with long and short.
4. The rack mechanism capable of guiding the keyboard cover to be opened or closed autonomously according to claim 1, characterized in that: The upper side wall of the guide slot (3) is provided with loading notch (4) at the highest point position.
5. The rack mechanism capable of guiding the keyboard cover to be opened or closed autonomously according to claim 1, wherein: The lower side wall of the guide slot (3) is provided with arc transition part (10) at the highest point position.
6. The rack mechanism capable of guiding the keyboard cover to be opened or closed autonomously according to claim 1, characterized in that: The rack (2) is installed with gear (8) engaged therewith, and the gear (8) is provided with rolling shaft sleeve (11) inserted into the guide slot (3).