JP3506843B2 - Keyboard instrument opening and closing mechanism for keyboard instruments - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard cover opening and closing mechanism for a keyboard instrument such as a piano. 2. Description of the Related Art Conventionally, a keyboard cover which is opened and closed by the rotation of a keyboard instrument is configured such that when it is closed by its own weight, the impact force of the keyboard cover is not applied to a hand placed on the keyboard. Things are known. SUMMARY OF THE INVENTION The present invention relates to a keyboard cover opening and closing mechanism for a keyboard instrument of this kind, which has a simpler construction and is easier to manufacture than conventional ones, and does not impair the appearance. The task is to provide According to the present invention, in order to solve the above-mentioned problems, a keyboard cover is rotatably mounted on plate- like guide members provided on both sides inside a musical instrument case, respectively.
The front edge of the back roof is rotatably connected to the rear edge of the keyboard cover,
該奥roof slidably guided is on the upper surface of the guide member
Is fixed tree to the lower surface with the, and is inserted into the instrument case when opened is fallboard, post when closing edge is configured so as to approach the lower end of the front plate on the musical instrument case, the upper front plate
The lower end surface of the and the guide member located below the
And a movable member of a damper attached to the musical instrument case is connected to the attachment. The damper is composed of an oil-filled damper with a valve mechanism. It is characterized in that it produces an action and does not produce a damper action when opened. According to the configuration of the present invention, when the keyboard lid is closed by its own weight, the keyboard lid is connected to the damper via the inner roof, so that the keyboard lid is loosely closed with a damper action. When opening the lid,
Since the damper action of the damper does not occur on the keyboard lid, it can be opened with a light force. Embodiments of the present invention will be described with reference to the drawings. [0006] In FIGS. 1 and 2, 1 denotes a musical instrument case, the plate-like guide member 3 is attached to the inside of the bracket 2 on both sides, the fallboard 4, planting both sides in the recess 5 of the guide member 3 One end is fixed to the other end of a V-shaped arm 7 rotatably supported on a shaft 6 provided, and is openable and closable.
The rear end is connected to the front end of the back roof 9 by a hinge 8. Rear roof 9 is fixed urging tree 10 which slides an upper surface of the front Kiga id member 3 on its lower surface, this biasing tree 10, the oil-filled with mounted valve mechanism inside the side plate 11 of the musical instrument case 1 The movable part of the damper 12 is connected. As shown in FIG. 1A, the back roof 9 is pushed by the keyboard cover 4 and inserted into the inside of the musical instrument case 1 in a state where the keyboard cover 4 is opened, as shown in FIG. 1B. In the state where the keyboard cover 4 is closed, the rear end comes close to the lower end of the upper front plate 13 so that no gap is formed. Up
The lower end surface of the front plate 13 is inclined downward toward the front, and
The guide member 3 is located in the front-rear direction below the upper front plate 13.
Is inclined downward toward the front. The damper 1
As shown in FIG. 3, a case 15 is slidably housed in a case 15 filled with oil 14 and provided with a conduction hole 16 and a pair of valves 17, 17 for opening and closing the conduction hole. in the left side of the movable portion 19 connected to the piston 18 FIG. 3 (a), the words when moving in the direction of opening the fallboard 4, the oil 14 on the left side of the chamber passes through the through hole 16 a valve 17, 17 , And flows into the right chamber, so that the movement is facilitated and the damper action does not occur.
When the valve 9 moves to the right in FIG. 3B, that is, when the keyboard cover 4 moves in the closing direction, the valves 17, 17 close, so that the oil 14 in the right chamber passes through the small holes 20, 20 to the left. , The movement is suppressed, and a damper action occurs. As shown in FIG. 4, the damper 12 uses a ball 21 having a valve action for opening and closing the through hole 16 instead of the valve 17, and is disposed in a recess 22 connected to the through hole 16. Good. Next, the operation of the opening / closing mechanism of the keyboard lid will be described. When the keyboard lid 4 in the open state moves down and closes as shown in FIG. Since the tree 10 slides on the guide member 3 and moves forward to generate a damping action of the oil-filled damper 12 with the valve mechanism connected thereto, the keyboard cover 4 connected to the back roof 8 is loose. And closed as shown in FIG. 1 (B). Therefore, even if the hand rests on the mouth stick or the like, the impact force of the keyboard cover 4 is not applied to the hand. When the keyboard cover 4 is opened, the damper 12 does not act as a damper.
It can be opened with a light force. According to the present invention, when the keyboard cover is closed by its own weight, the impact force can be prevented from being applied to the hand placed on the keyboard, and the structure is simple and easy to manufacture. This has the effect of not impairing the appearance.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B are side views of a keyboard cover opening / closing mechanism according to the present invention in a state where a front arm is removed and when the cover is opened and closed. FIG. 2 is an exploded perspective view of the keyboard cover opening / closing mechanism shown in FIG. 1; FIGS. 3A and 3B are explanatory diagrams of the operation of an oil-filled damper with a valve mechanism when the keyboard cover is opened and closed. FIG. 4 is an explanatory view of another example of an oil-filled damper with a valve mechanism. [Description of Signs] 1 ... Musical instrument case 2 ... Brace 3 ... Guide member 4 ... Key cover 7 ... Arm 9 ... Back roof 10 ... Attached wood 11 ... Side plate 12: Oil-filled damper with valve mechanism 13: Upper front plate

Continuation of the front page (56) References Japanese Utility Model Sho 56-93783 (JP, U) Japanese Utility Model Sho 62-6796 (JP, U) Japanese Utility Model 7-38949 (JP, Y2) Japanese Utility Model 58-48712 (JP) , Y2) Jikgyo 49-14595 (JP, Y1) Jikgyo 7-13032 (JP, Y2) Utility model registration 2518043 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10C 3/02 G10C 3/12 G10B 3/00 G10H 1/32

Claims (1)

(57) [Claims 1] A keyboard cover is rotatably mounted on plate- like guide members provided on both sides inside the musical instrument case, and a rear edge of the keyboard cover is provided at a front edge of the back roof. edge is rotatably connected,該奥roof sliding is freely guided on the upper surface of the guide member
Is secured to the tree underside with that, and is inserted into the instrument case when opened is fallboard, post when closing edge is configured so as to approach the lower end of the front plate on the musical instrument case, the upper front plate of
The lower end face and the guide member located below the lower end face
Together are downwardly inclined towards, is the urging tree linked movable member of the damper attached to the musical instrument case, the damper is constructed from an oil-filled damper with a valve mechanism, damping action when closing the fallboard And a keyboard cover opening / closing mechanism for a keyboard instrument, wherein the keyboard cover opening / closing mechanism does not generate a damper function when opened.