JPH0743756Y2 - Keyboard lid opening / closing mechanism - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a mechanism for opening and closing a keyboard lid of a keyboard instrument or the like, which operates lightly at the start and end of opening and closing of the lid, and when the lid is closed, it suddenly drops due to its own weight. This is to prevent the load from being applied to the lid from the state immediately before the lid is closed.

(Prior Art) Conventionally, in this opening / closing mechanism, for example, in an electronic organ, as shown in FIG. 4, a keyboard lid A is openably and closably screwed to a front end of an inner roof C which is fixedly mounted on the upper back of both side plates B. Is worn
When the lid is opened, mounting plates D having arms positioned behind the keyboard lid A are attached to both side ends, and a coil is provided between the tip of the arm of the mounting plate D and the locking metal fitting E provided on the side plate B. A spring F is stretched so that the natural fall of the keyboard lid A due to rotation when the lid is closed is regulated by the elastic action of the coil spring F to prevent the wrist or fingers from being pinched by the keyboard lid A. It has been known.

(Problems to be solved by the invention) However, in the opening / closing mechanism of this structure, since the elastic force of the coil spring F is proportionally changed in accordance with the rotation angle of the keyboard lid A, the keyboard is Only the effect of softening the free fall of the lid A due to its own weight is obtained, and the effect of feeling that the load is suddenly released by suddenly stopping the load by pushing the lid immediately before closing the lid and further dropping it is not expected.

Also, the coil spring F used is a mounting plate D when the lid is closed.
Since it is always pulled by the arm portion of the keyboard, it is easily stretched, and there is a risk that the coil spring F will be cut due to repeated rotation of the keyboard lid A. If the acting force of the coil spring F is excessive,
The keyboard lid A is not fully closed and is in a floating state, and it is necessary to keep the design of the coil spring F and the relative positions of the respective components accurate, which has a drawback that the assembly work is troublesome.

(Means for Solving the Problem) The present invention has been made in view of the above points and has been made to improve. A stay having one end attached to the back surface of the keyboard lid and the other end extending rearwardly and having a spring pressing metal fitting is provided. And a leaf spring formed by attaching a friction member to a surface of a free end of which one end is attached to a rear surface of the back roof or an inner surface of the case and is bent at an arbitrary angle behind the spring pressing metal fitting in a closed state, It is composed of a receiving metal fitting planted in the case close to the rear surface of the free end of the leaf spring, and the leaf spring is pressed by a spring pressing metal fitting accompanying the rotation of the stay during the opening / closing operation of the keyboard lid. Further, by pressing the leaf spring against the metal fitting, the reaction force of the leaf spring and the frictional force of the friction member are elastically applied to the keyboard lid to reduce the drop due to its own weight. The pressure on the spring was released to release the load on the keyboard lid.

(Operation) The pressing of the leaf spring by the spring pressing metal fitting due to the rotation of the stay shifts from the cantilever support to the two-point support to increase the reaction force, and this reaction force and the friction force of the friction member are applied to the keyboard lid. It imparts elasticity to reduce the drop due to its own weight, and immediately before closing the lid, it releases the load on the keyboard lid and gives the feeling that the lid falls down.

Embodiment An embodiment of the invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a main part of an embodiment of the present invention.

A back roof 2 is fixed to the upper rear surface of the case 1, and a keyboard lid 3 is rotatably screwed to the front end of the case 1. One end is attached to the rear rear end of the keyboard lid 3 and the other end is attached to the keyboard lid. A stay 4 extending rearward from the rear end face of the stay 3 is fixed, and a spring pressing fitting 5 projecting at a right angle to the stay 4 is provided at the other end.
Further, inside the case 1, there is provided a stopper 6 with which the tip of the stay 4 abuts when the keyboard cover 3 is fully opened.

On the other hand, one end is attached to the rear end portion of the inner roof 2, and the other end of the leaf spring 7 that bends at an arbitrary angle is attached in a cantilevered support state so that it flexes freely. A friction member 8 such as felt is attached to the. Below the tip of the leaf spring 7, a receiving fitting 9 is planted inside the case 1 at a position where it does not contact the leaf spring 7.

The leaf spring 7 may be attached to the inside of the side surface of the case 1 by bending one side surface.

Next, the operation of the present embodiment configured as described above will be described with reference to FIG.

When the keyboard lid 3 is fully opened, the tip of the stay 4 contacts the stopper 6 planted in the case 1 as shown by the broken line, and the lid is in the open state.

When the keyboard lid 3 is rotated forward from this and the vertical state is passed, the spring pressing metal member 5 of the stay 4 contacts the friction member 8 of the leaf spring 7 and presses the leaf spring 7 downward, and the upper surface of the friction member 8 is pushed. Since it moves while sliding, the reaction force of the leaf spring 7 and the frictional force of the friction member 8 have the effect of controlling the rotation of the keyboard lid 3 as shown by A in FIG.

Further, the spring pressing fitting 5 of the stay 4 is rotated by rotating the keyboard lid 3.
When moving on the friction member 8 while pressing the leaf spring 7,
The leaf spring 7 bends and its front end abuts against the receiving metal fitting 9, and the leaf spring 7 is in a two-point supporting state of the mounting portion and the receiving metal fitting 9, and the repulsive force is sharp as shown in part B in FIG. Increased to
The action of controlling the rotation of the keyboard lid 3 is increased.

In the state where the keyboard lid 3 is shown by the solid line in FIG. 2, the reaction force of the leaf spring 7 and the friction force of the friction member 8 act synergistically on the spring pressing fitting 5 of the stay 4 as shown in FIG. 3C. Such a load is generated, and as a result, the dropping operation of the keyboard lid 3 due to its own weight via the stay 4 is reduced.

Immediately before the keyboard lid 3 is closed as indicated by the alternate long and short dash line in FIG. 1, the rotation trajectory of the stay 4 tip deviates from the pressing position of the leaf spring 7, so that the spring pressing metal member 5 does not press the leaf spring 7, and
As shown in FIG. D, the load on the keyboard lid 3 is suddenly released,
It gives a feeling of falling down.

The opening of the keyboard lid 3 is performed in the reverse process of the above description, and when the lid is opened, the leaf spring 7 is in an open state with respect to the spring pressing metal fitting 5 of the stay 4, and any load acts on the keyboard lid. Without lifting lightly, as the opening angle increases, stay 4
The spring pressing metal piece 5 gradually presses the leaf spring 7 strongly, and the load for opening the keyboard lid 3 increases, but when the spring pressure metal piece 5 leaves the pressed state of the leaf spring 7, the load sharply decreases and the vertical state. When it exceeds, the front end of the stay 4 contacts the stopper of the case 1 by tilting backward due to its own weight, and the opened state is maintained.

For the convenience of explanation, the opening / closing mechanism described above has been described on one side.However, this opening / closing mechanism is generally provided on both sides of the keyboard lid. Of course, when is light, the opening and closing mechanism can be provided on only one side.

(Effect of the Invention) As described above, according to the opening / closing mechanism of the keyboard lid of the present invention, the spring pressing metal fitting at the tip of the stay 4 is accompanied by the rotation operation of the keyboard lid 3 from the open state to the closed state. The reaction force of the leaf spring 7 pressed by 5 shifts from the state of cantilever support to the state of two-point support, whereby the reaction force of the leaf spring rapidly increases, and this reaction force and the friction force of the friction member are applied to the keyboard. By acting synergistically on the lid 3, the falling action of the keyboard lid 3 due to its own weight is diminished, and the spring pressing fitting does not press the leaf spring immediately before the lid is closed, so the load on the keyboard lid suddenly disappears and the stone cover is closed. It has the effect of giving a feeling of falling and giving a feeling of opening and closing that is not possible with conventional opening and closing mechanisms.

In addition, the leaf spring is in a free state where no load is applied in the open and closed state, and compared with the conventional open / close mechanism in which the load is always applied in the open or closed state, There is no fear of stretching or breaking of the spring due to repetitive action, and it has an advantage that the same feeling as the initial opening and closing feeling can be obtained even after long-term use.

Furthermore, the leaf spring has a simple shape that is only bent,
The material cost is low, and the opening / closing mechanism of the present invention has an advantage that manufacturing costs can be reduced by attaching each part in advance at the time of assembly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an essential part of an embodiment of a keyboard lid opening / closing mechanism according to the present invention, FIG. 2 is a side view showing an operating state based on a pivot position of the keyboard lid, and FIG. 3 is FIG. And FIG. 4 is a side view showing a conventional keyboard lid opening / closing mechanism in the working state of FIG. In the figure, 1 ... Case, 2 ... Back roof, 3 ... Keyboard lid, 4 ... Stay, 5 ... Spring pressing metal, 6 ... Stopper, 7 ... Leaf spring, 8 ... Friction member, 9 ... Receiving metal is there.

Claims (1)

[Scope of utility model registration request] 1. A keyboard cover rotatably hinged to a rear roof secured to the rear of the upper surface of a case, one end of which is attached to the back surface of the keyboard cover and the other end of which is extended rearward to provide a spring pressing member. A plate having a stay and a friction member attached to the surface of the free end, which is attached to the rear surface of the inner roof or the inner surface of the case at one end and is bent at an arbitrary angle behind the spring pressing metal fitting in a closed state. It consists of a spring and a receiving metal fitting planted in the case close to the rear surface of the free end of the leaf spring. During the opening and closing operation of the keyboard cover, the leaf spring is fixed by the spring pressing metal fitting with the rotation of the stay. By pressing and pressing the leaf spring into contact with the metal fitting, the leaf spring shifts from cantilever support to two-point support to increase the reaction force, and the reaction force of the leaf spring and the friction force of the friction member are increased. Elasticity is given to the keyboard lid to reduce the drop due to its own weight. The opening and closing mechanism of the keyboard lid is characterized in that the pressure of the leaf spring is released to release the load on the keyboard lid.