JPS584120Y2 - Opening/closing mechanism of the keyboard lid in an organ - Google Patents

Description

[Detailed description of the invention] This invention relates to an opening/closing mechanism for the keyboard lid of an organ.

In a desk-type organ, generally, as shown in Figures 1 and 2, the keyboard lid a is hinged to the front end of the back roof so that it can be opened and closed, and support rods d are provided on both sides of the keyboard lid. A coil spring S is stretched between the hook f at the lower end and the metal fitting e on the side plate C, making it easy to open the keyboard lid a, and when closing it as shown by the dotted line, the coil spring S stretches and the lid closes. It is designed to reduce weight and provide soft operation.

By the way, in this conventional opening/closing mechanism, a coil spring is connected to the support rod, so when it is closed, the spring stretches considerably and there is a risk of damage due to repeated use. The keyboard does not close sufficiently and tends to float up, and during assembly, the coil spring must be stretched between the keyboard lid and the side plate with the interior components already assembled, which is cumbersome. Also, when removing the back roof for adjustment of electrical components (in the case of electronic organs, there are many printed circuit boards etc. located under the back roof), it is necessary to remove the coil springs one by one. There are drawbacks.

This idea was made to solve the above-mentioned drawbacks, and it separates the support rod of the keyboard lid from the coil spring to prevent stress from being applied to the coil spring, and also makes it easier to attach and detach the keyboard lid and rear roof. This provides an opening/closing mechanism that has a soft-touch opening/closing function for the keyboard lid.

Figures 3 and 4 show an embodiment of this invention, in which a long leg 1a, a short leg 1b, and a shaft 1c are attached to both sides of the front end of the back side of the back roof (only one side is shown in the figure). U consisting of
The glyph rod 1 is rotatably attached to the restraining member 2, and the locking member 3 is fixed at a position near the inside of the restraining member 2,
A coil spring 4 of a required strength is stretched between this locking member 3 and the tip of the short leg 1b of the U-shaped rod 1, and the U-shaped rod 1 is always urged to rotate clockwise. be.

On the other hand, the tip of the long leg 1a of the U-shaped rod 1 is fixed to both sides of the back surface of the keyboard lid a by the spring force of the coil spring 4, and the short shaft-shaped receiver provided at the tip of the support rod d is in contact with the tool 5. .

In FIG. 3, the keyboard cover a is fully opened and the coil spring 4 is in a shortened state.

If the keyboard lid a is closed in this state, the tip of the support rod d will rotate the U-shaped rod 1 counterclockwise via the long leg 1a, and the tip of the short leg 1b will be connected to the top of the back roof. The coil spring 4, which is stretched between the locking member 3 of The keyboard lid a is closed as shown in FIG.

At this time, the gravity of the keyboard lid a is reduced by the expansion of the coil spring 4 as described above, and the keyboard lid a gradually closes.

When opening, the contracting action of the coil spring 4 helps the keyboard lid a to easily pivot upward.

As mentioned above, in this invention, the keyboard lid is attached to the front end of the back roof so that it can be opened and closed, and support rods are provided on both sides of the back of the keyboard lid to keep it upright. A U-shaped frame is rotatably attached to the U-shaped frame, a coil spring is stretched between the tip of one leg of the U-shaped frame and the back of the back roof, and the tip of the other leg is always connected to the support rod of the keyboard lid. Since the tip is brought into contact with the direction in which the keyboard lid is opened, the expansion and contraction range of the coil spring is significantly smaller than that of conventional ones when opening and closing the keyboard lid, so there is no risk of damage even with repeated use, and the U-shaped Since the rods and coil springs can be attached to the back of the back roof in advance, there is no need to worry about latching the coil springs each time at the final stage of assembly, making the assembly process easier. As shown by the dotted line in Figure 4, the keyboard cover and the back roof can be assembled to the instrument body so that they can be opened and closed freely, and the keyboard cover can be opened and closed with a soft and light touch just like before.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of the organ with the keyboard lid open, Fig. 2 is a partially cutaway side view showing the conventional opening/closing mechanism of the keyboard lid, and Fig. 3 is a partial cutaway side view showing the opening/closing mechanism according to this invention. FIG. 4 is a partially cutaway side view with the keyboard lid closed. In the figure, 1 is a U-shaped rod, 1a is its long leg, 1b is its short leg, 1
c is the shaft, 2 is the restraining member, 3 is the locking member, 4 is the coil spring, 5 is the receiver A, a is the keyboard lid, b is the back roof, and d is the support rod.

Claims (1)

[Scope of utility model registration request] A keyboard lid a is attached to the front end of a back roof installed above the left and right side panels c, c so that it can be opened and closed freely, and a support rod d is attached to the keyboard lid a to open and hold the keyboard lid a at a predetermined angle. In this organ, a U-shaped frame 1 having two legs la and lb is rotatably attached to both sides of the front end of the back side of the back roof, and one leg 1b of the U-shaped frame 1 is attached to the back side of the organ. A coil spring 4 of the required strength is stretched between the tip and the back surface of the back roof, and the tip of the other leg 1a is constantly applied to the tip of the support rod d of the keyboard cover a in the direction of opening the keyboard cover a. When the keyboard lid a is brought into contact with the keyboard lid a, the U-shaped frame 1 is rotated by the support rod d, and the coil spring 4 is expanded.