JPH0245909Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is a vertical piano that has a simple structure, can securely fix the lower front plate, and can prevent rattling or accidental falling off. Regarding the lower front plate mounting structure.

[Conventional technology]

The lower front plate of a vertical piano is disposed between the front base and the shelf, and covers the lower front of the instrument housing, and is usually attached as shown in FIG. 4. That is,
1 is a vertical piano instrument case, and this instrument case 1 has an upper front plate 2, a lower front plate 3, and a pair of left and right side plates (main plate).
4, 5, a ridge plate 7, a bottom plate 8, a front base 9, etc., forming a vertically long box shape, and inside there are pillars 11 and a sounding body 1.
2, a frame 13, strings, an action mechanism (none of which are shown), a pedal mechanism 14, and the like are housed. Furthermore, on the front side of the instrument housing 1, between the upper front plate 2 and the lower front plate 3, a keyboard section 18 consisting of a shelf board 15, a pair of right and left arms 16, a keyboard lid 17, etc. protrudes forward and is integrated. A large number of keys 19 are arranged on this keyboard section 18.

The lower front plate 3 is detachably attached between the front base 9 and the shelf board 15, and its lower end is attached to the front base 9.
and a plurality of dowels, for example, three dowels 2
The position is fixed by 0. For this reason,
Three dowel holes are formed on the upper surface of the front base 9, corresponding to each dowel 20. On the other hand, the upper end of the lower front plate 3 is pressed and locked by a leaf spring 21 attached to the lower surface of the shelf board 15 in a cantilevered manner.

When removing the lower front plate 3, push up the free end of the leaf spring 21 and at the same time pull the knob 22 to tilt the lower front plate 3 forward to release the engagement with the leaf spring 21. The dowel 20 can then be pulled out from the dowel hole by pulling up the lower front plate 3 diagonally forward and upward.

[Problem that the invention attempts to solve]

However, in such a conventional lower front plate mounting structure, if the spring force of the leaf spring 21 is weak, or if the spring force becomes weak due to fatigue, the lower front plate 3 cannot be fixed stably and reliably, causing problems during performance. There was an inconvenience in that the lower front plate 3 rattled due to vibration or the like, or if the lower front plate 3 was accidentally kicked with a foot, it would come off.

Therefore, it is conceivable to fix the lower front plate 3 with setscrews, etc., as in the case of electric pianos, but in that case, during maintenance or inspection, multiple setscrews may be removed using an appropriate tool such as a screwdriver, or The problem was that the screws had to be reattached, which was troublesome, and screws were often lost.

Furthermore, since electric pianos have built-in electrical circuits, safety standards require that the lower front plate be fixed with appropriate fixing means and that it be removed using some kind of tool according to the Electrical Handling Act. Therefore, setscrews, brackets, etc. are used as fixing means, but in this case, it is required that the fixing can be done reliably with a minimum number of parts and that the removal operation can be easily performed.

[Means for solving problems]

The structure for attaching the lower front plate of a vertical piano according to this invention solves the above-mentioned problems and can be applied not only to general pianos but also to electric pianos. is removably placed and fixed on the front base, and the upper end is pressed by the tip of a leaf spring that is cantilevered and attached to the bottom surface of the shelf.
In the structure for attaching the lower front plate of a vertical piano, a spring pressure adjustment screw is screwed into the middle part of the leaf spring, the tip of which is brought into contact with the lower surface of the shelf plate, and this screw allows the This is designed to increase the pressing force of the leaf spring.

[Effect]

In this invention, the spring pressure adjustment screw deforms the leaf spring so that it can be brought into stronger pressure contact with the lower front plate, so the lower front plate is securely fixed and prevents rattling or falling off due to vibrations, etc.

〔Example〕

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of the lower front plate mounting structure according to this invention, and FIG. 2 is a perspective view of the lower front plate. In this embodiment, the lower end of the lower front plate 3 is placed on the front base 9, the three dowels 20 are fitted into the dowel holes 30 via punchings 31 made of felt, etc., and the lower front plate 3 is placed on the front base 9. The structure in which the upper end of the lower front plate 3 is pressed and locked with the free end of the leaf spring 21 attached to the lower surface 33 of the shelf board is the same as the above conventional structure, and the structure in which the upper end of the lower front plate 3 is pressed and locked is the same as the above conventional structure. The difference is that a spring pressure adjusting screw 35 is screwed through a locking nut 36, and its tip is brought into contact with the lower surface 33 of the shelf board.

A protrusion 37 that protrudes toward the upper surface of the spring 21 is integrally formed on the screw attachment portion of the leaf spring 21 by burring, and a screw into which the spring pressure adjustment screw 35 is screwed is inserted into the center of the protrusion 37. A hole (not shown) is formed. The free end portion of the leaf spring 21 is bent into a substantially hook shape to constitute a pressing portion 21A.

In the case of a vertical electric piano, the spring pressure adjustment screw 35 is a general round machine screw, and its head 3
5a is provided with a rotation operation portion 38 consisting of a plus or minus groove. Therefore, when tightening the screw 35, it is necessary to use an appropriate tool such as a screwdriver. On the other hand, in general vertical pianos, unlike electric pianos, the use of tools is not required, so the spring pressure adjustment screw 35 is a screw as shown in Figure 3, that is, the diameter of the head is the same as the diameter of the thread. In comparison, screws are used that are sufficiently large and can be easily tightened by hand.

Note that 40 is a dowel stopper.

In the lower front plate mounting structure having such a configuration, if the spring pressure adjusting screw 35 is not sufficiently loosened so that its tip is brought into contact with the lower surface 33 of the shelf plate, the leaf spring 21
As in the conventional structure described above, the spring force presses and locks the upper end surface of the lower front plate 3. When the screw 35 is tightened in this state, the screw 35 rises and its tip touches the lower surface of the shelf as shown in FIG.
Contact with 3. When the screw 35 is tightened again, the shelf plate 15 prevents the screw 35 from rising further, so the leaf spring 21 gradually elastically deforms downward, and the pressing part 21A pushes against the lower front plate 3. The leaf spring 21 is pressed against the upper surface and as a result the leaf spring 21 against the lower front plate 3
The pressing force increases. Therefore, even if the spring force of the leaf spring 21 is originally weak, the lower front plate 3
can be securely fixed, and can prevent rattling or falling off due to vibration, etc.

Also, tighten the locking nut 36 to release the leaf spring 21.
When pressed against the screw 21, the screw 21 will not loosen due to vibration or the like, and the elastic return of the leaf spring 21, in other words, a reduction in the pressing force can be prevented.

In this case, in the mounting structure shown in Fig. 1, when removing the lower front plate 3, it is necessary to loosen the spring pressure adjustment screw 35 with a tool such as a screwdriver, so that the vertical electric Suitable for attaching the lower front plate of a piano. Furthermore, the structure is simple and requires a minimum number of parts, making it inexpensive.

In addition, in the above embodiment, the lower front plate 3 is connected by the dowels 20.
In the above description, the invention is not limited to this, and the present invention is not limited to this, but may be a single continuous protrusion or a plurality of discontinuous protrusions on the lower surface of the lower front plate 3. Of course, the body may be integrally provided in a protruding manner, and this protruding strip body may be fitted into a long groove formed on the upper surface of the front base 9 to be positioned and fixed.

[Effect of idea]

As explained above, the structure for attaching the lower front plate of a vertical piano according to this invention has a spring pressure adjustment screw screwed into the leaf spring that presses and fixes the upper end of the lower front plate, and its tip is attached to the lower surface of the shelf board. Since the structure is configured so that they are in contact with each other, the pressing force of the leaf spring against the lower front plate is increased,
In addition, the screws increase the pressing force to prevent free deformation of the leaf spring, so the lower front plate can be more securely fixed, preventing the lower front plate from rattling or falling off due to vibration etc. Can be prevented. Further, it has the advantage that it has a simple structure, requires a minimum number of parts, can be provided at low cost, and can easily improve existing products.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of this invention, Fig. 2 is a perspective view of the lower front plate, Fig. 3 is a front view showing another embodiment of the spring pressure adjustment screw, and Fig. 4 is a conventional one. FIG. 2 is a partially cutaway side view of the vertical piano. 1... Instrument housing, 2... Upper front plate, 3... Lower front plate, 9... Front base, 15... Shelf board, 20... Dowel, 21... Leaf spring, 30... Dowel hole, 33...
Lower surface of shelf board, 35...Screw for adjusting spring pressure.

Claims (1)

[Claim for Utility Model Registration] The lower end of the lower front plate is removably placed and fixed on the front base, and the upper end is pressed and locked by the tip of a leaf spring that is cantilevered and attached to the lower surface of the shelf board. In the structure for attaching the lower front plate of a vertical piano, a spring pressure adjustment screw is screwed into the middle part of the leaf spring, the tip of which is brought into contact with the lower surface of the shelf plate, and the screw allows the leaf spring to A structure for attaching a lower front plate of a vertical piano, characterized in that the pressing force is increased.