JPS5850363Y2 - keyboard instrument - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a keyboard instrument, and in particular to an attachment structure for a back circle located at the rear of the keyboard of an upright piano, etc., and supporting the keyboard lid so that it can be opened and closed.

The drawing shows this idea embodied in an upright piano, with 10 a keyboard, 11 a shelf that supports the keyboard, and 1
2 is a pair of arms (only one is shown) standing parallel to the left and right sides of the keyboard 10; 13 is an inner circle located above the rear of the keyboard 10 and bridged between the pair of arms 12; and 14 is the inner circle 13.
16 is a keyboard holder, and 17 is an upper front plate that covers the front of the instrument above the back circle 13.

Reference numeral 18 denotes a back round stopper for attaching the back round 13 to the armrest 12, and is integrally made of a synthetic resin material or a light metal material.

In other words, the back round stopper 18 has a first piece 18a that extends in the front-rear direction with respect to the instrument body, and a second piece 18b that extends upward from the top surface of the first piece.
form a letter shape.

Each piece 18a, 18b has a wall 18C extending vertically on the inner surface, and a peripheral wall 1 standing upright on the periphery of the wall in both the front and back directions.
8 d, and the center line of wall 18 C (AA in Figure 3)
It is made to be symmetrical with respect to the horizontal line), and it is possible to attach the same shape to either the left or right side arms 12 by turning them upside down.

The second piece 18b has its front and rear surfaces 18e and 18f sloped so that its front and rear width increases downward. one side is the first piece 18 a
(may be at right angles to).

Further, the second piece 18b has slots 18g cut open from the upper end on both left and right sides, and the slots 18g
Both legs 18h that hold the.

18k with an elastic force in the front-rear direction.

The lower end of the slot 18g has a conical tapered surface 18m that spreads on both the left and right sides. You can change the width of the front and back.

The first piece 18a has a pair of elongated holes 18n, 18n extending in the front-back direction in the central wall 18C, and can be attached to the arm 12 so as to be adjustable back and forth by means of screws 20 inserted therethrough.

The back circle 13 has a step-shaped cutout surface 13a placed on the first piece 18a at the lower edge of both left and right end surfaces, and a second cutout surface 13a is connected to the cutout surface 13a and extends upwardly. It has a groove 13b into which the piece 18b is inserted.

The groove 13b has a slope on its front and rear inner surfaces 13C and 13d so that it has almost the same shape as the second piece 18b.

The back round stopper 18 is attached to the opposing inner surfaces of the pair of arms 12, and with the upper front plate 17 removed, the back round 13 is inserted between the arms 12 and placed on the back round stop 18. Can be fixed.

This invention does not necessarily require the first piece 18a of the back round stopper 18, but rather the second piece 18a extending in the vertical direction.
The piece 18b alone can sufficiently perform its function.

(In this case, a slot of 18 g can also be provided from the bottom end.

)However, due to the presence of the first piece 18a, the weight acts on the front edge of the back circle 13 when the keyboard cover 14 is opened, but stability against the weight can be improved.

Furthermore, if the left and right back round stoppers 18 are misaligned with respect to each other, the end face of the back round 13 may hit the arm bar 12 and cannot be attached, or there may be an inclined gap between the end face of the back circle 13 and the arm bar 12. This causes the appearance of the product to deteriorate.

Since the back round stopper 18 can be adjusted in movement in the front and back direction along the elongated hole 18H, the above-mentioned drawbacks are not present.

The fitting tolerance between the second piece 18b and the groove 13b is
In addition, the 18k is loosely set so that it can be fitted with almost no resistance in its natural state.

For actual assembly, screw in the countersunk screw 19, and use the conical or wedge-shaped surface on the lower surface of the countersunk screw head to spread out the slot 18g to open the front and rear sloped surfaces 18e, 18.
The distance between the tops of the grooves f is made larger than that of the groove 13b.

When assembling, the legs 18h, 18k are sometimes tightened by the grooves 13b against their elastic action.

This makes it possible to accurately determine the position of the back circle 13 and maintain that position over a long period of time, resulting in the height of the upper front plate 17 resting on the back circle 13, and the locking of the keyboard lid 14 and its front end. This prevents any deviation from occurring in the positional relationship.

In addition, conventionally, the back round stopper 18 was constructed only from a piece of wood that extends in the vertical direction, which made it impossible to improve processing accuracy, and also caused dimensional deviations due to the influence of humidity, etc. Due to the weight of the front panel, keyboard lid, etc., the wood pieces may dig into the grooves, causing not only the upper front panel and keyboard lid to be misaligned, but also making it impossible to remove the back circle during repairs or tuning. However, as mentioned above, slot 1
By virtue of the elasticity of both leg portions 18h and 18 of 8g and by surrounding the countersunk screw 19, the drawbacks of the prior art can be overcome.

As described above, this invention makes the groove provided on the end face of the back circle and the back circle stopper have a shape with a slope that widens downward, and the back round stopper is provided with a slot, and the slot is inserted between the holes. By imparting longitudinal elasticity to both legs, the position of the back circle, and by extension the upper front plate and keyboard lid, can be accurately determined and maintained over a long period of time.

In addition, the elasticity of the legs that hold the slot in place presses against the inner surface of the groove, preventing the back round stopper from digging into the groove.
The back circle can be easily removed for repair or tuning.

[Brief explanation of the drawing]

The drawings show this idea embodied in an upright piano. Figure 1 is a longitudinal cross-sectional view of the keyboard and its surroundings, Figure 2 is an enlarged view of the main parts of Figure 1, and Figure 3 is Figure 2. FIG. 4 is a sectional view taken along the line 3-3 of FIG. Description of nature, 12: Arm wood, 13: Okumaru, 13b: Groove, 1
8: Back round stopper, 18g: Slotted, 18h, 18
k: leg.

Claims (1)

[Scope of utility model registration request] 1. In a keyboard instrument in which a back circle located at the back of the keyboard is attached between a pair of arms located on the left and right sides of the keyboard, bridging it, and a keyboard lid is attached to the front edge of the back circle so that it can be opened and closed, both the left and right ends of the back circle A groove with an open lower end and extending in the vertical direction is provided on the surface, and a back circle stopper that fits into the groove and supports the back circle is fixed to the opposing inner surfaces of the pair of armrests, and the groove and the back circle stopper are fixed. The shape has a slope where the front and rear width widens downward, and the back round stopper is provided with slots cut open from either the top or bottom end on both the left and right sides, and the legs are sandwiched between the slots. A keyboard instrument characterized by having elasticity in the front-rear direction. 2. A utility model in which the width of the slot can be adjusted by a member inserted into the slot, thereby making it possible to adjust the distance between the front and rear sloped surfaces located before and after the slot. A keyboard instrument according to claim 1. 3. The keyboard instrument according to claim 2, wherein the member is a countersunk screw that exerts a wedge effect on both legs that sandwich the slot.