JP2001042858A - Damper structure of slide type fallboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to slowly lower the front end part of a fallboard in the final stage at the time of closing of the fallboard and to easily lift and open the fallboard in a closed state. SOLUTION: A damper unit 9 is arranged near the lateral front side on the rear side of the fallboard 4. When the front end plate 4a descends in the final stage of the closing of the fallboard 4, a crank shat 10 of the damper unit 9 rotates in the reverse direction (a direction where the fallboard rotates while receiving the brake by the viscosity of damper grease) accompanying the descending action. Then, the front end plate 4a descends slowly while having a buffer property. Also, when the front end plate 4a is lifted upward in order to open the fallboard 4, the turning of the crank shaft 10 is not limited and, therefore, the front end plate may be easily lifted without requiring large force. At this time, the crank shaft 10 is rotated in a forward direction by the energizing force of a spring for resetting and is promptly reset to a home position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a sliding type lid mounted on a keyboard instrument, and more particularly to a damper structure for providing a buffering property when closing the lid.

[0002]

2. Description of the Related Art Keyboard instruments, such as electronic pianos and electronic organs, which are widely used in general households and the like, have an opening / closing lid that can be opened and closed on the upper surface side of the keyboard to close the upper side of the keyboard when not in use. Have. The opening / closing lid of a keyboard instrument has been used in many cases, such as an upright-type piano, in which the lid is turned by approximately 90 °. Recently, however, the lid is slid in the front-rear direction to open and close. The slide type which performs is often adopted.

[0003] A sliding keyboard cover has sliding pieces that slide on sliding surfaces provided on both the left and right sides of the keyboard.
To change from the closed state to the open state, the front end plate in front of the keyboard cover is slightly lifted upward, and then the keyboard cover is pressed rearward. As a result, the sliding piece of the keyboard lid slides on the sliding surface, and the keyboard lid slides, is stored in the swallowing opening of the keyboard lid, and is opened.

Further, when closing the open keyboard cover, if the front end plate of the keyboard cover is pulled out and slid, the front end plate reaches the front end of the keyboard.
The front end plate falls slightly downward to close the upper surface of the keyboard.

However, in the slide-type keyboard lid configured as described above, when the front end of the keyboard lid falls downward at the time of closing, the player places his or her finger between the front end and the keyboard instrument body. Problems such as loud noises caused by pinching and sudden dropping occur.

Therefore, in order to solve such a problem, a sliding keyboard cover having a buffer structure using an air damper has been conventionally proposed. The air damper obtains a buffer structure by using air pressure. In a conventional slide-type keyboard lid, the front end plate is slowly dropped downward while being braked by utilizing the buffer property.

[0007]

However, in the damper structure using the above-described air damper, in the final stage of closing the keyboard cover, it is possible to reduce the impact when the front end of the keyboard cover falls downward. Although it can solve problems such as the player pinching a finger and generating a loud noise, the simple air damper has a buffering effect only in the linear direction along the cylinder, so the linear motion is Required mechanical parts to convert to Furthermore, since it takes some time before the buffering operation is performed, an attempt was made to open the keyboard cover, but for some reason the opening of the cover was abandoned and the cover was closed halfway, for example,
When the operation is performed with a small opening and closing amount, braking is not reliably performed, and problems such as pinching of a finger and generating a loud noise have occurred.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to reliably close a slide-type keyboard cover with a cushioning property regardless of the opening / closing amount. Another object of the present invention is to provide a damper structure for a slide-type keyboard lid capable of opening a closed keyboard lid without requiring a large force.

[0009]

In order to achieve the above object, the invention according to claim 1 of the present application is arranged on the side of a keyboard of a keyboard musical instrument, and is formed on an inclined portion that is gently inclined, and is formed on a front side. In a damper structure of a slide-type keyboard lid capable of sliding on a sliding surface composed of a vertical portion and an upper surface side of the keyboard, the sliding surface is disposed below front ends of both side portions of the keyboard lid. A sliding member slidable on the upper side, and a damper unit disposed on a side front side of the back side of the keyboard cover, wherein the damper unit has a rotation center portion and a rotation arm portion. A crank member having a crank shape has a configuration in which the rotation center portion of the crank member rotates smoothly when rotating in the forward direction, and rotates with a constant frictional force when rotating in the reverse direction, In addition, the rotation center is rotated in the forward direction. The rotating arm portion slides on the sliding surface when the keyboard cover is opened and closed, and when the sliding member descends the vertical portion of the sliding surface, The keyboard cover is lowered in a buffered manner by rotating the rotation center portion in the opposite direction while a rotating arm portion is locked on the sliding surface.

[0010] According to a second aspect of the present invention, there is provided a sliding instrument having a sloping portion which is disposed on a side of a keyboard of a keyboard instrument and which is gently inclined, and which has a vertical portion formed on the front side. In a damper structure for a slide-type keyboard lid that can be moved to open and close the upper surface side of the keyboard, a sliding member that is disposed below a front end of both sides of the keyboard lid and that can slide on the sliding surface, A back surface side of the keyboard cover, a damper unit arranged on a side front side, the damper unit having a crank shape having a rotation center portion and a rotation arm portion, and a crank member; and A rotating sleeve that pivotally supports a rotation center, a one-way clutch that couples the rotation center of the crank member to the rotation sleeve so as to be rotatable only in a forward direction and prevents rotation in a reverse direction, Times A sleeve case that supports the sleeve with a slight gap from the outer peripheral surface of the rotary sleeve, a viscous friction material filled in a gap between the rotary sleeve and the sleeve case, and the crank member. An elastic body that urges rotation in the direction,
The rotating arm slides on the sliding surface when the keyboard cover is opened and closed, and when the sliding member descends a vertical portion of the sliding surface, the rotating arm moves on the sliding surface. The keyboard cover is lowered in a buffered manner by being locked and rotating the rotation center portion in the opposite direction.

According to a third aspect of the present invention, a concave portion for engaging a rotary arm of the crank member is formed on a front side of the inclined portion of the sliding surface, and the sliding member is formed by the vertical portion. When descending, the rotation arm portion engages with the concave portion to rotate the rotation center portion in the opposite direction.

The invention according to claim 4 is characterized in that the viscous friction material is a damper grease. The invention according to claim 5 is characterized in that the elastic body is a torsion spring.

According to the present invention constructed as described above, when closing the open lid, when the player pulls the lid forward, the sliding members formed on both sides of the lid are provided. Slides on the sliding surface, whereby the keyboard cover slides forward. Then, the sliding member reaches the front end of the inclined portion,
When descending the vertical portion, the rotating arm of the crank member mounted on the damper unit is locked on the sliding surface, and the rotation center of the crank member is in the opposite direction, that is, by viscous friction material (damper grease). As it rotates in the direction in which the braking is applied, the lid slowly descends, closing the upper opening of the keyboard.

On the other hand, when opening the closed cover, if the player lifts the front end of the cover, the lift can be easily lifted without the braking by the damper unit. When the front end of the keyboard lid is lifted, the center of rotation of the crank member rotates in the forward direction, that is, the direction in which the one-way clutch can rotate, by the urging force of the elastic body (torsion spring). Will return to the original position.

Therefore, even when the player once lifts the front end of the keyboard lid and immediately lowers it, braking of the damper unit is applied, so that the keyboard lid can be lowered slowly.

Further, if a concave portion is formed in front of the inclined portion of the sliding surface, the front end of the keyboard lid is lowered with the rotating arm of the crank member engaged with the concave portion, and Since the rotation center portion of the crank member rotates, an operation with a sense of moderation becomes possible.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a configuration of a keyboard instrument 1 to which a keyboard lid damper structure according to an embodiment of the present invention is applied. FIG. 2 shows a state in which the keyboard cover 4 is closed.

As shown in FIG. 1, the keyboard instrument 1 has a plurality of keyboards 2 (white keys 2a and black keys 2b), and guide surfaces 3 (sliders) on both sides of the keyboard 2. Moving surface) is formed. The guide surface 3 has a top 3a at an appropriate position on the rear side of the keyboard instrument 1 (the side indicated by reference numeral "Y1" in the figure), and further forward from the top 3a (reference numeral "Y2" in the figure).
Front inclined surface 3b gently inclined toward
And, it has a rear inclined surface 3c gently inclined from the top 3a toward the rear side.

In the foremost part of the guide surface 3, a vertical surface 3
d is formed, and the front inclined surface 3 near the vertical surface 3d is further formed.
On b, a concave portion 3e slightly recessed downward is formed. The concave portion 3e is not always necessary. If the concave portion 3e is not formed, a gap longer than the diameter of the rotating arm 10a (described later) is required between the keyboard cover 4 and the sliding surface 3.

On the other hand, a keyboard cover 4 is provided so as to cover the upper surface of the keyboard 2 of the keyboard instrument 1. The keyboard cover 4 has a flat plate shape as a whole.
A front end plate 4a whose lower surface is formed at an acute angle is arranged so that a player can easily put the hand in and lift it.
Further, sliding pieces (sliding members) 4b that slide on the guide surface 3 are formed on both sides of the front end plate 4a.
A pinion 6 is rotatably attached to the rear end of the keyboard cover 4 via a connecting member 5.

The keyboard instrument 1 is located behind the keyboard 2,
A swallow opening 7 for accommodating the keyboard cover 4 is formed, and a rack 8 having a length substantially equal to the length of the keyboard cover 4 in the depth direction is installed inside the swallow opening 7. The rack 8 and the pinion 6 attached to the keyboard cover 4 are engaged with each other, and when the keyboard cover 4 is slid in the front-rear direction (in the figure, toward the reference signs “Y1” and “Y2”), the rack The pinion 6 slides on the upper surface 8, and the keyboard cover 4 can be moved forward or backward with a certain click feeling to close or open the upper surface side of the keyboard 2.

Also, one side of the keyboard cover 4 (or
At the front side of both sides), a damper unit 9 for reducing an impact when the front end plate 4a descends at the final stage of closing the lid 4 is attached.

FIGS. 4 to 6 are explanatory views showing the detailed configuration of the damper unit 9. FIG. 4 is a plan view showing the internal configuration of the damper unit 9, and FIG. 5 is a side view showing the internal configuration. 6 is a front view.

As shown in each figure, the damper unit 9
Has a configuration in which the whole is molded inside the sleeve case 13, and the crankshaft (crank member) 1
0 is rotated without applying braking in one direction (forward direction), and is rotated while applying constant braking in the other direction (reverse direction). Note that rotation in the direction of arrow “A1” shown in FIG. 6 is referred to as forward rotation, and rotation in the direction of arrow “A2” is referred to as reverse rotation.

The crankshaft 10 is formed by bending a round bar into a crank shape, and has a short rotating arm 10.
a and an elongated rotation center portion 10b. The rotation center portion 10b is inserted into and supported by the rotation sleeve 11 having a bottomed cylindrical shape, and the opening portion of the rotation sleeve 11 can rotate the rotation center portion 10b of the crankshaft 10 only in the forward direction. A one-way clutch 12 is provided.

The rotating sleeve 11 includes a sleeve case 13
Is coaxially housed in a hollow portion 13a having a circular cross section formed therein, and a certain gap exists between the outer peripheral surface of the rotating sleeve 11 and the inner peripheral surface of the hollow portion 13a. .
The gap is filled with a damper grease (viscous friction material) 14. An O-ring 15 is provided between the rotating sleeve 11 and the sleeve case 13 so that the damper grease 14 does not leak outside after the damper grease 14 is filled.

The damper grease 14 has a desired viscosity, and a certain amount of braking is applied when the rotating sleeve 11 rotates with respect to the sleeve case 13. Also,
A return spring 16 (elastic body) formed of a torsion spring is attached between the crankshaft 10 and the sleeve case 13, and the crankshaft 10 rotates with respect to the sleeve case 13 (reverse rotation). rear,
The urging force of the return spring 16 causes the crankshaft 10
Are rotated in the opposite direction (forward rotation) to return to the original position. The sleeve case 1
The through-hole 17 formed in 3 is a fixing hole for fixing the damper unit 9 to the back side of the keyboard cover 4 shown in FIG. 1 by bolting.

Further, as shown in FIG. 5, a stopper 1 for regulating the rotation angle of the crankshaft 10 is provided on the side of the sleeve case 13 where the crankshaft 10 protrudes.
The stopper 18 prevents the crankshaft 10 from rotating beyond the angle θ shown in FIG. Then, the above-described crankshaft 10
The rotary arm 10a slides on the guide surface 3 of the keyboard instrument 1 together with the sliding piece 4b shown in FIG.

FIG. 2 is an explanatory view showing a state in which the keyboard cover 4 is stored in the swallowing opening 7 and the upper surface side of the keyboard 2 is opened.
FIG. 3 is an explanatory view showing a state in which the front end plate 4a at the tip of the keyboard cover 4 is approaching the vertical surface 3d of the guide surface 3,
The operation of the present embodiment will be described with reference to these drawings.

When the keyboard cover 4 is opened, as shown in FIG. 2, the entire keyboard cover 4 is housed inside the swallowing opening 7, and at this time, the pinion 6 is located at the rear end of the rack 8. When the player grasps the front end plate 4a of the keyboard cover 4 and pulls the keyboard cover 4 forward, the pinion 6 slides on the rack 8 and the sliding piece 4b slides on the guide surface 3. The keyboard cover 4 slides forward.

In the initial stage of the drawing operation, the sliding piece 4b slightly rises along the rear inclined surface 3c of the guide surface 3.
Until the sliding piece 4b reaches the top 3a of the guide surface 3, the player needs to pull out the keyboard cover 4 with a slight force.
Thereafter, when the sliding piece 4b exceeds the top 3a, the sliding piece 4b
Since b slides on the front inclined surface 3b, the keyboard cover 4 slowly slides forward due to its own weight.

When the sliding piece 4b reaches the front end of the guide surface 3, as shown in FIG. 3, the rotating arm 10a of the crankshaft 10 of the damper unit 9 attached to the back side of the keyboard cover 4 guides the guide. It is located slightly closer to the front (that is, rearward) than the recess 3e formed on the surface 3.

When the keyboard cover 4 is further pulled forward, the sliding piece 4b descends at a substantially right angle along the vertical portion 3d of the guide surface 3, as shown in FIG. Immediately before the sliding piece 4b descends, the rotary arm portion 10a of the crankshaft 10 falls into the concave portion 3e, and the rotary arm portion 10a of the crankshaft 10 is locked at this position. 4b, the rotating arm portion 10a of the crankshaft 10 moves in the direction of the arrow "B" in FIG.
1 ".

Here, the rotation in the direction of arrow "B1" in FIG. 1 corresponds to the rotation in the direction of arrow "A2" in FIG. 6 (reverse rotation). Therefore, a rotating force acts on the one-way clutch 12 shown in FIG. 4 in the reverse direction, and the rotation center portion 10b of the crankshaft 10 does not rotate with respect to the rotating sleeve 11, so that the rotating sleeve 1
1 rotates with respect to the sleeve case 13.

As described above, since the damper grease 14 is filled between the rotary sleeve 11 and the hollow portion 13a of the sleeve case 13, the crankshaft 10
Is stopped by the frictional force of the damper grease 14, and as a result, the front end plate 4a of the keyboard cover 4 shown in FIG. In this way, a buffering effect when closing the keyboard cover 4 can be obtained.

On the other hand, when opening the closed cover 4 in a closed state, the player grasps the front end plate 4a of the cover 4 and lifts it upward. At this time, since the crankshaft 10 of the damper unit 9 is not restricted at all, the player can easily lift the front end plate 4a with a small force against the own weight of the keyboard cover 4, and the sliding piece 4b
Can be put on the front inclined surface 3b of the guide surface 3 (that is, the state of FIG. 1 can be changed to the state of FIG. 3).

Thereafter, when the player presses the keyboard cover 4 toward the rear side of the keyboard instrument 1, the sliding piece 4b rises along the front inclined surface 3b of the guide surface 3, and after the top portion 3a, the rear inclined surface 4b. It slides while descending along its own weight along 3c, and is stored in the swallowing opening 7. Thus, the keyboard cover 4 can be opened.

Here, when the front end plate 4a of the keyboard cover 4 is lifted at the initial stage of the opening operation, the engagement between the rotating arm portion 10a of the crankshaft 10 and the concave portion 3e of the guide surface 3 is released. By the urging force of 16, the crankshaft 10 rotates in the forward direction of the one-way clutch 12 (the direction of the arrow "A1" shown in FIG. 6). That is, the crankshaft 10 rotates in the direction of the arrow "B2" shown in FIG. 1, and the rotating arm portion 10a of the crankshaft 10 immediately returns to the original position.

That is, the player grasps the front end 4a of the closed cover 4 and lifts the cover 4 once.
Even when the hand is immediately released from the front end 4a, the rotating arm 10a of the crankshaft 10 is immediately returned to the original position by the urging force of the return spring 16, so that the lowering operation of the keyboard cover 4 is braked. Is added, and the keyboard cover 4 is slowly lowered.

As described above, in the keyboard damper structure according to the present embodiment, the front end plate 4 a of the keyboard lid 4 is slowly braked by the damping action of the damper unit 9 in the final stage when the keyboard lid 4 is closed. As the player descends, it is possible to solve the problem that the player pinches his or her finger between the keyboard cover 4 and the keyboard instrument 1 or generates a loud sound due to the impact when the keyboard cover 4 is lowered.

When the front cover 4a of the keyboard cover 4 is lifted when the cover 4 is opened, the crankshaft 1
Since 0 is not regulated at all, it can be easily lifted. When the front end plate 4a of the keyboard cover 4 is lifted, the one-way clutch 12 rotates in the forward direction by the urging force of the return spring 16, and the crankshaft 10 returns to the original position. Even after being lifted and lowered again, the keyboard cover 4 can be lowered slowly due to the buffering action of the damper unit 9.

In the above-described embodiment, the return spring 16 constituted by a torsion spring is used as an elastic body for rotating the crankshaft 10 in the forward direction and returning the crankshaft 10 to the original position. Although an example of use has been described, the present invention is not limited to this, and can be replaced with an elastic body having an equivalent function.

Although the damper grease 14 has been described as an example of the viscous friction material filling the gap between the rotating sleeve 11 and the hollow portion 13a of the sleeve case 13, the present invention is not limited to this. It can be replaced with a material whose rotational braking can be applied due to viscosity.

[0044]

As described above, in the damper structure of the sliding-type keyboard lid according to the present invention, in the final stage of the operation of closing the keyboard lid, the front end of the keyboard lid is subjected to braking by the damping action of the damper unit. Because it descends slowly, it is possible to prevent a strong impact when the cover is closed, and to avoid problems such as pinching fingers between the cover and the keyboard instrument body and generating loud sounds. it can.

Further, when the closed cover is opened, when the front end of the cover is lifted upward, the crank member is not restricted at all. Therefore, the cover is easily applied with a small force enough to lift the dead weight of the cover. Can be lifted and has good operability.

Further, when the cover is closed, the crank member which has been rotated in the reverse direction with a constant frictional force (rotated in a direction to be braked by the viscous friction material), raises the front end side of the cover to an elastic body (torsion spring). ), The forward rotation (rotation in the direction in which the one-way clutch 12 can rotate) is immediately returned to the original position, so that the front end of the keyboard lid is once lifted, and then the front end is immediately lowered. Even in this case, the buffering action can be reliably obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a keyboard instrument to which a damper structure of a sliding keyboard lid according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing a state in which a keyboard cover is opened.

FIG. 3 is an explanatory view showing a state in which a front end of a keyboard cover is approaching a front end of a guide surface.

FIG. 4 is a plan view showing an internal configuration of a damper unit.

FIG. 5 is a side view showing the internal configuration of the damper unit.

FIG. 6 is a front view of the damper unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard musical instrument 2 Keyboard 2a White key 2b Black key 3 Guide surface (sliding surface) 3a Top 3b Front inclined surface 3c Rear inclined surface 3d Vertical surface 3e Depression 4 Keyboard cover 4a Front end plate 4b Sliding piece (sliding member) Reference Signs List 5 connecting member 6 pinion 7 swallowing opening 8 rack 9 damper unit 10 crankshaft (crank member) 10a rotating arm portion 10b rotation center portion 11 rotating sleeve 12 one-way clutch 13 sleeve case 13a hollow portion 14 damper grease (viscous friction material) 15 o Ring 16 Return spring (elastic body) 17 Through hole 18 Stopper

Claims (5)

[Claims] An open / closed upper surface side of a keyboard musical instrument is slid on a sliding surface including a gently inclined portion disposed on a side of a keyboard of a keyboard instrument and a vertical portion formed on a front side. In a possible damper structure for a slide-type keyboard lid, a sliding member disposed below a front end portion on both sides of the keyboard lid and slidable on the sliding surface; And a damper unit disposed on the side, the damper unit includes a crank member having a crank shape having a rotation center portion and a rotation arm portion, and the rotation center portion of the crank member rotates in a forward direction. When rotating, has a configuration that rotates with a constant frictional force when rotating in the reverse direction, and has an elastic body that urges the rotation center portion to rotate in the forward direction, The rotating arm part opens and closes the keyboard cover When the sliding member slides on the sliding surface and the sliding member descends the vertical portion of the sliding surface, the rotating arm portion is locked on the sliding surface and the rotation center portion moves in the opposite direction. A damper structure for a sliding-type keyboard lid, characterized in that the lid is lowered in a buffered manner by rotating the lid. 2. An upper surface of the keyboard is opened and closed by sliding on a sliding surface comprising a gently inclined portion disposed on the keyboard side of the keyboard instrument and a vertical portion formed on the front side. In a possible damper structure for a slide-type keyboard lid, a sliding member disposed below a front end portion on both sides of the keyboard lid and slidable on the sliding surface; A damper unit disposed on a side of the crankshaft, wherein the damper unit has a crank member having a rotation center portion and a rotation arm portion and having a crank shape; and a rotation sleeve for pivotally supporting the rotation center portion of the crank member. A one-way clutch that allows the rotation center of the crank member to rotate only in the forward direction and prevents rotation in the reverse direction with respect to the rotating sleeve; and A sleeve case that pivotally supports the outer peripheral surface of the sleeve with a slight gap; a viscous friction material filled in a gap between the rotary sleeve and the sleeve case; and a forward biasing of the crank member. The rotating arm portion slides on the sliding surface when the keyboard cover is opened and closed, and when the sliding member descends the vertical portion of the sliding surface, A damper structure for a slide-type keyboard cover, wherein a rotary arm portion is locked to the sliding surface and the center of rotation is rotated in a reverse direction to lower the keyboard cover in a buffered manner. 3. A concave portion for engaging a rotating arm portion of the crank member is formed in front of the inclined portion of the sliding surface, and when the sliding member descends the vertical portion, The damper structure for a slide-type keyboard cover according to claim 1, wherein the rotating arm portion engages with the concave portion to rotate the rotation center portion in a reverse direction. 4. The damper structure for a slide-type keyboard lid according to claim 2, wherein the viscous friction material is a damper grease. 5. The damper structure for a slide-type keyboard cover according to claim 2, wherein the elastic body is a torsion spring.