JP3527372B2 - Opening / closing control device for keyboard lid - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard lid opening / closing control device for controlling the opening / closing of a pivotable keyboard lid of an upright piano or an upright electronic piano. . 2. Description of the Related Art Generally, a keyboard cover of this type has a rear end pivotally connected to a back roof via a hinge, and is opened and closed about the hinge. When closing the keyboard cover, it is pulled toward the user and rotated to bring the lower surface of the front end of the keyboard cover into contact with the upper surface of the mouthpiece. In such an opening / closing method, when the closing operation is not appropriate, for example, the keyboard lid may be vigorously rotated by its own weight, and may strongly collide with the mouthpiece and damage the keyboard lid or the mouthpiece. A keyboard cover opening / closing control device is provided to solve such a problem. One of the devices is a shock absorber including a one-way torque type hydraulic damper fixed to a brace or a shelf board, and a shock absorber. 2. Description of the Related Art A link mechanism connected between a keyboard and a keyboard cover is conventionally known.
According to this configuration, when the keyboard cover rotates in the closing direction, the braking force of the shock absorber acts on the keyboard cover via the link mechanism, whereby the keyboard cover is slowly closed. [0004] However, the above-described conventional opening / closing control device has a drawback that the manufacturing cost is high because a hydraulic damper is used. In addition, this opening / closing control device has a problem that it is difficult to comply with the JIS regulations for attaching and detaching the keyboard cover. That is, the JIS specifies that the keyboard cover of an upright piano must be removable without using a tool or the like in order to perform tuning or the like. On the other hand, in the conventional switching control device,
Since the shock absorber is fixed to a brace or shelf plate integral with the piano body and further connected to the keyboard lid via a link mechanism, parts from the keyboard lid to the shock absorber when removing the keyboard lid The parts must be separated from each other at at least one point in the connection between them. For this reason, in order to satisfy the JIS regulations, the connecting portion to be separated must have a structure that can be easily attached and detached without using a tool or the like. In such a case, the portion tends to come off when opening and closing the keyboard cover, It is difficult to stably open and close the lid. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a keyboard cover can be easily attached and detached without using a tool and the like, and can be constructed relatively inexpensively. It is an object of the present invention to provide a keyboard cover opening / closing control device which can be smoothly opened and closed and can be opened slowly and surely. [0006] In order to achieve this object, the invention according to claim 1 of the present invention is rotatably mounted on a back roof and is opened and closed between an open position and a closed position. A lid opening / closing control device for controlling opening / closing of a lid,
The back roof is detachably attached to the piano body, and one end is rotatably connected to the keyboard lid.The connection bar is attached to the back roof and engages with the connection bar to close the keyboard lid. and a pressure loading means for applying a load to fallboard via the connecting bar when rotated to the position, communication
A guide pin extending laterally is provided at the other end of the binding bar.
The loading means is a leaf spring fixed to the back roof.
This leaf spring is provided with a guide pin of the engaged connecting bar.
Guides slidably in the front-rear direction.
And a pair of wall portions,
Corresponds to the position just before the open position when the cover turns to the open position
Lock the guide pin in the open position of the keyboard cover
It is characterized by having a constricted portion for making. In this keyboard cover opening / closing control device, when the keyboard cover is turned to the closed position, the load means engaging with the connecting bar rotatable with respect to the keyboard cover is provided via the connecting bar. Since the load is applied to the cover to brake the cover, the cover is decelerated and closed slowly and reliably. In addition, since the loading means is attached to the detachable back roof with respect to the piano body, the attachment / detachment of the keyboard lid can be performed together with the back roof, the loading means and the connecting bar. Therefore, the keyboard lid can be easily attached and detached without using tools, etc.
The rule of S can be easily cleared, and the lid can be opened and closed stably without detachment. [0008] [0009] [0010] [0011] [0012] [0013] In this configuration, with the opening and closing of the fallboard, the connecting bar of the guide pin is guided between a pair of wall portions of the leaf spring, It slides smoothly along this. Also, when the lid is turned to the open position, the guide pin pushes out the constricted portion against the spring force of the leaf spring immediately before the lid reaches the open position, and then the guide pin The position corresponding to the open position is reached. In this state, the narrow neck portion prevents the guide pin from sliding toward the closed position, thereby locking the keyboard cover at the open position. As a result, the cover can be stably held at the open position, and the cover can be closed only when a relatively large closing force is applied. Therefore, even when an unexpected force acts while the cover is open, it is possible to reliably prevent the cover from suddenly closing and being damaged by its own weight, and to stably open and close the cover. it can. Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 to 3 show a configuration of a keyboard lid of an upright piano incorporating a switching control device according to a first embodiment of the present invention, and a peripheral configuration thereof. The keyboard cover 1 is made of plywood or the like, and has a horizontally-long rectangular planar shape and an inverted L-shaped cross-sectional shape. The rear end of the keyboard cover 1 is rotatably attached to the front end of the back roof 3 via the hinge 2, and the open position shown in FIG. 1 and the closed position shown in FIG. It is opened and closed by rotating between. The back roof 3 is made of plywood or the like, and, like the upper front plate 4 erected thereon, is detachably attached to a piano body (not shown). Specifically, a back-roofed tree 5 is attached to the rear end of the lower surface of the back-roof 3, and the back-roofed wood 5 is located between three back roof receivers 6 projecting inward from arms (not shown). , The back roof 3 is detachably attached to the arm bar. In the drawing, reference numeral 7 denotes a shelf board, 8 denotes a clapboard, 9 denotes a mouth stick attached to the front surface of the shelf board 7, and the keyboard cover 1 contacts the mouth stick 9 in the closed position. An opening / closing control device 10 according to the present invention comprises a connecting bar 11 rotatably attached to the keyboard lid 1;
A casing 12 for guiding the connection bar 11 and a coil spring 13 for urging the connection bar 11 are provided. The connecting bar 11 has a fixed bar 1 at its front end.
4, and is fixed to the fixed bar 14
It is screwed flush to the outer surface of the keyboard cover 1. Also,
A guide pin 15 is rotatably attached to the inner surface of the rear end of the connection bar 11. As shown in FIG. 3, the casing 12 has a cylindrical shape, and is fixed to the lower surface of the back roof 3 in a state facing in the front-rear direction. The casing 12 is formed with a pair of left and right guide grooves 12a, 12a extending in the front-rear direction, and the guide pins 15 of the connecting bar 11 are engaged with the guide grooves 12a, 12a in a retaining state. The coil spring 13 is housed in the casing 12 and has a front end fixed to the inner wall of the casing 12 and a rear end connected to the guide pin 1 of the connecting bar 11.
It is wound around 5. Next, the operation of the opening / closing control device 10 having the above configuration will be described. FIG. 1 shows a state where the keyboard cover 1 is in an open position. In this open position, the keyboard cover 1 is pivoted to the maximum in the counterclockwise direction in the figure, and its front corner is in contact with the upper front plate 4. Further, the connecting bar 11 is moved forward to the maximum, and the coil spring 13 is in a contracted state in which the spring force is almost zero. When the keyboard 1 is pulled down from this open position, the keyboard 1 rotates clockwise in the drawing. With the rotation of the keyboard cover 1, a fixing bar 1 is attached to the keyboard cover 1.
The connecting bar 11 connected via the guide pin 4
Is guided by the guide groove 12a and slides backward along the guide groove 12a. As the connecting bar 11 slides, the coil spring 13 wound around the guide pin 15
The connecting bar 11 is urged in the right direction in the drawing, that is, in a direction in which the keyboard cover 1 is turned to the open position side, by a spring force corresponding to the amount of expansion, and the keyboard cover 1 is connected via the connecting bar 11. Brakes 1 As shown in FIG. 2, the rotation of the keyboard cover 1 ends when the lower surface of the front portion thereof comes into contact with the mouthpiece 9.
This position is the closed position of the keyboard cover 1. In this state,
The guide pin 15 of the connecting bar 11 is located near the rear edge of the guide groove 12a, so that the spring force of the extended coil spring 13 and the torque acting on the keyboard cover 1 are balanced. As described above, in the opening / closing control device 10 of the present embodiment, when the keyboard cover 1 rotates to the closed position, the spring force of the coil spring 13 acts on the keyboard cover 1 as a braking force. The spring force is zero at the start of closing, and gradually increases as the rotation proceeds, and reaches a maximum at the end of the closing, where the rotation speed tends to increase, so that the keyboard 1 can be closed smoothly and surely slowly. it can. When the keyboard cover 1 is opened from the closed position to the open position, the spring force of the coil spring 13 acts as a force to assist in opening the keyboard cover 1, so that the keyboard cover 1 can be easily opened. it can. Further, in the opening / closing control device 10 of the present embodiment, the back roof 3 detachably attached to the piano body.
In addition, the casing 12 containing the coil spring 13 is fixed, and furthermore, the casing 12 and the keyboard cover 1 are connected via the connecting bar 11 and the fixing bar 14, so that the keyboard cover 1 can be attached and detached. Back roof 3, casing 12,
Together with the connecting bar 11 and the fixed bar 14, it can be carried out collectively. Therefore, the keyboard lid 1 can be easily attached and detached without using a tool or the like, so that the JIS regulations can be easily cleared, and the keyboard lid 1 can be opened and closed stably without detachment. Further, when the cover 1 is opened, most of the casing 12 is hidden under the back roof 3, and as shown in FIG. It has almost no adverse effect on the appearance of the piano. Next, a keyboard cover opening / closing control device according to a second embodiment of the present invention will be described with reference to FIGS. This opening / closing control device 20 uses a leaf spring as a means for loading the keyboard cover 1 instead of the coil spring 13 of the opening / closing control device 10 of the first embodiment. The leaf spring 23 is formed by bending a thin iron plate or the like so that the rear end is closed, and has a pair of upper and lower wall portions 23a, 23a facing each other, between the upper and lower wall portions 23a, 23a. Guide groove 24 extending in the front-rear direction
Is defined. The leaf spring 23 has an upper wall portion 23 a screwed to the back roof 3 via a fixing plate 25. The guide pin 15 of the connection bar 11 similar to the first embodiment is slidably engaged with the guide groove 24 of the leaf spring 23 (see FIG. 6). The width of the guide groove 24 before the engagement of the guide pin 15, that is, the interval between the upper and lower walls 23a and 23b is set to a value slightly smaller than the diameter of the guide pin 15. Also, guide groove 2
Reference numeral 4 denotes a narrow constricted portion 26 immediately behind the position corresponding to the open position of the keyboard cover 1 and a closed portion 27 substantially closed on the front side, and the constricted portion 26 and the closed portion 27 are closed. A lock portion 28 is formed therebetween. According to the above configuration, as the keyboard cover 1 is opened from the closed position shown in FIG. 5 to the open position shown in FIG.
The connection bar 11 smoothly slides forward along the guide groove 24 in a state where the guide pin 15 is guided by the guide groove 24 of the leaf spring 23 so that a light spring force is applied from the wall portions 23a. Is done. And the connecting bar 11
Immediately before the cover 1 reaches the open position, the constricted portion 26 is pushed out against its spring force and then reaches the lock portion 28. This position is the open position of the keyboard cover 1, and in this state, the guide pin 15 causes the fore-
And locked by the lock portion 28 while being restricted by the closing portion 27. On the other hand, when the keyboard cover 1 is closed from this open position, a relatively large closing force is applied at the beginning of the closing, so that the guide pin 15 pushes the constricted portion 26 to spread out against the spring force. After that, the connecting bar 11 is smoothly slid rearward along the guide groove 24 with a light spring force applied from the walls 23a, 23a. As described above, in the opening / closing control device 20 of this embodiment, when the keyboard cover 1 is in the open position, the connecting bar 1
Since the first guide pin 15 is locked by the lock portion 28, the keyboard cover 1 can be stably held at the open position, and can be closed only when a relatively large closing force is applied. Therefore, even when an unexpected force acts while the cover 1 is open, it is possible to reliably avoid a situation in which the cover 1 is suddenly closed by its own weight and is damaged, and the cover 1 is stably opened and closed. can do. The leaf spring 23 is fixed to the back roof 3 so that the keyboard cover 1 can be attached and detached together with the back roof 3 and the leaf spring 23 without using any tools. It is the same as the opening / closing control device 10 of the first embodiment described above in that the spring 23 is hidden under the back roof 3 and has almost no adverse effect on the appearance of the piano. Next, a keyboard cover opening / closing control device according to a third embodiment of the present invention will be described with reference to FIGS. This opening / closing control device 30 uses a one-way clutch as a means for loading the keyboard cover 1. As shown in these drawings, the one-way clutch 31 includes a gear 32 attached to the back roof 3 and a rack 33 formed on the connection bar 11. The gear 32 is rotatably mounted on an outer surface of a base 34 screwed to the lower surface of the back roof 3 so that a predetermined rotational load is applied by the frictional resistance with the base 34 during the rotation. It has become. Rack 3
3 is formed over substantially the entire lower surface of the connection bar 11. In addition, the peak of the teeth of the rack 33 is formed in a state of lying down rearward, whereby the connecting bar 1
When the cover 1 is moved rearward, that is, when the keyboard lid 1 is rotated to the closed position side, it meshes with the gear 32 and drives it to rotate, while when the connecting bar 11 goes forward, that is, when the keyboard lid 1 is opened. When it turns to the side, it slips on the gear 32 and does not rotate it. Further, the base 34 is provided with a spring-loaded pusher 35 having a weak spring force in order to maintain a state in which the connecting bar 11 is pressed against the gear 32. According to the above configuration, when closing the keyboard cover 1 from the open position shown in FIG.
Meshes with the gear 32 to rotate the gear 32 counterclockwise in FIG. At this time, the rotational load of the gear 32 acts as a reaction force on the keyboard lid 1 via the connecting bar 11 and the fixed bar 14 to brake the keyboard 1, so that the keyboard lid 1 can be surely closed slowly. On the other hand, when the cover 1 is opened from the closed position shown in FIG. 8, the rack 33 of the connecting bar 11 idles on the gear 32, so that the gear 32 does not rotate and the rotational load is reduced. 1 does not act on it, so that the keyboard cover 1 can be easily opened. In addition, the keyboard lid 1 and the back roof 3 can be easily attached and detached without using a tool, and the appearance of the piano is hardly affected, as in the above-described two embodiments. The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, in the first embodiment, the coil spring is configured as a tension spring, but may be configured as a compression spring. Although the embodiment is an example in which the present invention is applied to a keyboard lid of an upright piano, it is a matter of course that the present invention may be applied to a keyboard lid of an upright electronic piano.
In addition, within the scope of the present invention, the configuration of the details
It is possible to change. As described above, the keyboard cover opening / closing control device of the present invention can easily attach and detach the keyboard cover without using any tools, and can be constructed relatively inexpensively. It has effects such as being able to open and close stably and smoothly and opening slowly and surely.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a keyboard cover opening / closing control device for an upright piano according to a first embodiment of the present invention, with the keyboard cover opened.
It is a side view shown with the structure of the periphery. FIG. 2 is a side view similar to FIG. 1, with the keyboard cover closed. FIG. 3 is a front view in which an arrow portion of FIG. 1 is cut away. FIG. 4 is a side view showing a second embodiment of the present invention with a keyboard cover opened. FIG. 5 is a side view similar to FIG. 4, with the keyboard cover closed. FIG. 6 is a front view in which an arrow part of FIG. 4 is broken. FIG. 7 is a side view showing a third embodiment of the present invention with a keyboard cover opened. FIG. 8 is a side view similar to FIG. 7, with the keyboard cover closed. FIG. 9 is a front view corresponding to FIG. 7; DESCRIPTION OF SYMBOLS 1 Keyboard lid 3 Back roof 10 Opening / closing control device 11 Connecting bar 12 Casing 12a Guide groove 13 Coil spring 15 Guide pin 20 Opening / closing control device 23 Leaf spring 26 Constriction portion 28 Lock portion 23a Upper and lower wall portions 30 Opening / closing control Device 31 One-way clutch 32 Gear 33 Rack

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-159794 (JP, A) JP-A-6-74277 (JP, A) JP-A-10-105157 (JP, A) JP-A-9-99 281957 (JP, A) Japanese Utility Model 4-85494 (JP, U) Japanese Utility Model Application No. 54-32118 (JP, U) Japanese Utility Model Application No. 54-81720 (JP, U) Japanese Utility Model Application No. 58-121092 (JP, U) Jikken Sho 49-14595 (JP, Y1) Jikken Sho 59-13646 (JP, Y2) Jigoku 58-48712 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10C 3/02 G10C 3/12 G10B 3/00

Claims (1)

(57) [Claim 1] A key cover opening / closing control device which is rotatably mounted on an inner roof and controls opening / closing of a key cover which is opened / closed between an open position and a closed position. Wherein the back roof is removably attached to the piano body, one end of the connection bar is rotatably connected to the keyboard lid, and attached to the back roof, the connection bar engaged, and a pressure loading means for applying a load to the fallboard via the connecting bar when said fallboard is rotated to the closed position, the other end of the connecting bar, the side Guide pin extending to
And the load means is fixed to the back roof.
The leaf springs are engaged with each other.
The guide pin of the tie bar is slidable in the front and rear direction.
Having a pair of walls facing each other,
The pair of walls are such that the keyboard cover is pivoted toward the open position.
The key in a position immediately before the open position
The guide pin is locked in the open position of the lid.
Opening of the keyboard cover characterized by having a constriction
Close control device.