JP4424800B2 - Grand piano front mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for a forehead of a grand piano provided to be passed between left and right arms.
[0002]
[Prior art]
The forehead is provided so as to be passed between the left and right arms formed at the front end of the pile, constitutes part of the case of the grand piano, and is connected to the pile, the frame, etc. It constitutes a part of the back mechanism that supports the tension. 6 and 7 show a conventional general mounting structure of a forehead. The front rod 51 is composed of a single lauan plywood or the like extending in the left-right direction. As shown in both figures, the left and right ends of the front rod 51 are placed on the pile 52, and the upper corners thereof are rearward. Are attached to the back of each arm 53 with screws 54 (only one is shown). In this case, in order to position the lower part of the front wing 51 with respect to the pile 52, dowel holes 51a and 52a formed at predetermined positions of the both 51 and 52, respectively, and dowels 55 engaged therewith are used. .
[0003]
In addition, on the rear side of the front rod 51, a pin plate 56 that is passed between the left and right front portions of the loading 52 and fixed to the frame 57 fixed on the pin plate 56 has a predetermined interval. The front collar 51 is provided with screws 59 passed from the rear through the holes 57a of the frame 57 in a state in which the intermediary 58 is interposed between the front collar 51 and the frame 57 at several places, for example, three places. Thus, the frame 57 is fixed.
[0004]
[Problems to be solved by the invention]
As described above, the forehead 51 is made of a wood material such as lauan plywood and extends long in the left-right direction, so that its own rigidity is not so large. On the other hand, the above-described conventional mounting structure is basically one in which the left and right ends of the front heel 51 are screwed to the arm 53, and in addition to this, there are several spaces between them. It is only screwed to the separated frame 57 via the insert 58. For this reason, since the connection strength with the arm 53 and the frame 57 is small, and the rigidity of the forehead 51 cannot be ensured sufficiently, there is a drawback that the forehead 51 is likely to warp and bend in the vertical direction.
[0005]
Further, as described above, the forehead 51 is connected to the frame 57 and the like, and constitutes a part of the back mechanism that supports the tension of the string. Since the space between the pin plate 53 and the shelf plate is wide, the rigidity tends to be insufficient. For this reason, if the connection strength with the frame 57 or the like is low, the forehead 51 becomes a weak point of the back mechanism, and due to the large deflection of the forehead 51 due to the great tension of the strings and changes in temperature and humidity, Problems such as unstable tuning will occur.
[0006]
Furthermore, in the conventional mounting structure, it is necessary to use the dowel 55 and the intermediary 58 to mount the front bar 51, so that there is a disadvantage that the number of parts and the number of assembly steps increase.
[0007]
The present invention has been made in order to solve such a problem, and can reduce the number of parts and can attach a forehead firmly, thereby increasing the rigidity of the back mechanism. The purpose is to provide a mounting structure for the bag.
[0008]
[Means for Solving the Problems]
In order to achieve this object, the present invention provides a front piano mounting structure for a grand piano for mounting a front shaft provided to be passed between left and right arms respectively formed on the left and right front ends of the pile. A pin plate with both ends fixed to the left and right front parts of the pile is provided on the rear side of the left and right arms so as to extend in the left-right direction. In addition, a notch that opens rearward and downward is formed so as to extend continuously in the length direction, and the front wing is adhered and / or mounted on the front end portion of the pin plate fitted in the notch. It is fixed to the front end portion of the pin plate by screwing from below, and both end portions are screwed to the back surfaces of the left and right arms.
[0009]
In this grand piano forehead mounting structure, both the left and right ends of the forehead are screwed to the backs of the left and right arms, as in the prior art. In addition, a notch opening rearward and downward is formed in the lower part of the front ridge so as to continuously extend in the length direction, and the front end portion of the pin plate is fitted into this notch, The front rod is mounted and supported on the front end portion of the pin plate, and is fixed thereto by adhesion and / or screwing from below. That is, the front wing is fixed to the pin plate in a state in which the pin plate is fitted in the notch and is continuously mounted and supported on the pin plate in the entire length direction. Therefore, the front wing can be firmly attached to the pin plate, and as a result, the stacking via the pin plate and the connection strength and unity with the frame are greatly improved compared to the conventional case, so that the back mechanism The rigidity of can be increased.
[0010]
Further, in this mounting structure, since the pin plate is fitted into the notch in the lower part of the front wing, there is a gap between the conventional dowel 55 and the dowel holes 51a and 52a for positioning the lower part of the front heel, and the frame 57. Therefore, the conventional intermediary 58 for filling the space is not necessary, and accordingly, the number of parts, the number of assembly steps, and the number of processing steps can be reduced. Furthermore, since the front notch is open rearward and downward, it can be formed relatively easily.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a mounting structure of a front piano for a grand piano to which the present invention is applied. In this mounting structure 1, the pile 2 and the arm 3 are configured in the same manner as in the prior art, and the left and right arms 3, 3 (only one is shown) are integrally formed at the left and right front ends of the pile 2. . Specifically, after adhering side left and right plates (not shown) to the upper surface of each front end of the unloading 2, the front and back surfaces thereof are cut with an NC cutting machine (not shown) to obtain a predetermined A brace 3 having a shape and size is formed.
[0012]
The forehead 4 is made of Lauan plywood, etc., as in the past, and extends in the left-right direction, with both ends abutting against the cut flat back surfaces of the left and right arms 3, 3. The corners are fixed by screws 5 and 5 (only one is shown). Further, a notch 6 is formed in the lower part of the front collar 4 so as to extend continuously over the entire length direction. This notch 6 opens to the rear and lower side of the front wing 4 and has a rectangular cross section with a predetermined height and width, and a portion other than the notch 6 at the lower portion of the front ridge 4 becomes a protruding portion 7. Yes. As shown in FIG. 3A, the notch 6 is formed by cutting the material 4a of the forehead 4 having a rectangular cross section, or two different predetermined sizes as shown in FIG. This is done by combining and bonding the materials 4b and 4c.
[0013]
The pin plate 8 has a plywood structure in which a plurality of hard solid plates made of maple or the like are bonded together as in the prior art, and is arranged so as to extend in the left-right direction on the rear side of the arm 3, and both end portions thereof are stacked. It is bonded and fixed to the upper surfaces of the left and right front parts of the lift 2. A frame 9 is placed on and fixed to the pin plate 8. Further, the pin plate 8 extends to the front side as compared with the prior art, and the front end portion thereof is fitted to the notch 6 of the front collar 4 exactly. Specifically, the front end surface of the pin plate 8 abuts on the back surface of the protruding portion 7 of the front collar 4 and the upper surface of the front end section abuts on the top surface of the notch 6 so that the front collar 4 is placed.・ We support. The front wing 4 is placed and supported on the pin plate 8 as described above, and a contact surface with the pin plate 8 is adhered, and a plurality of screws 10 (from the lower side of the pin 8 ( Only one is shown) and is fixed to the pin plate 8.
[0014]
The front wing 4 by the mounting structure 1 having the above-described configuration is mounted by the following procedure, for example. That is, first, the arm 3 is formed and the front surface of the pin plate 8 is cut using the NC cutting machine with the side left and right plates and the pin plate 8 attached to the pile 2. In this case, the cutting width of the back surface of the arm 3 is set by appropriately setting the width of the blade of the NC cutting machine in accordance with the size of the gap to be formed between the back surface of the arm 3 and the front surface of the pin plate 8. And the front face of the pin plate 8 can be cut simultaneously, and the front face of the pin plate 8 can be properly positioned.
[0015]
Next, after applying an adhesive to the inner wall surface of the notch 6 of the forehead 4 produced as described above, the left and right ends of the projecting portion 7 are inserted into the gaps between the arms 3 and the pin plate 8. At the same time, by fitting the notch 6 to the pin plate 8, the front rod 4 is placed and supported on the pin plate 8. In this state, both ends of the forehead 4 are fixed to the back surface of the arm 3 with screws 5. Next, according to a normal assembly process, when the pile 2 or the like is turned upside down to attach a shelf board (not shown), the front wing 4 is fixed to the pin plate 8 with a plurality of screws 10. Thereby, the tightening operation | work of the screw 10 can be performed easily. Next, after the stacking 2 and the like are turned upside down again, the frame 9 is mounted on the pin plate 8 and fixed, and the mounting of the front wing 4 is completed.
[0016]
As described above, according to the mounting structure 1 for the front collar 4 of the present embodiment, the front collar 4 has the pin plate 8 fitted in the notch 6 so that the entire length direction is continuously provided. It is mounted and supported on the pin plate 8, and in this state, it is bonded to the pin plate 8 and screwed. Therefore, the forehead 4 can be firmly attached to the pin plate 8, and as a result, the connection strength and the integrity with the pile 2 and the frame 9 via the pin plate 8 are greatly improved as compared with the conventional case. As a result, the rigidity of the back mechanism can be increased. Thereby, for example, the deflection of the forehead 4 due to the influence of a large string tension or a change in temperature and humidity can be suppressed, and tuning and the like can be performed stably.
[0017]
Further, in this mounting structure 1, since the pin plate 8 is fitted into the notch 6 in the lower part of the front wing 4, the conventional dowel 55 and dowel holes 51a, 52a for positioning the lower part of the front heel, The conventional intermediary 58 for filling the gaps between them is not necessary, and accordingly, the number of parts, the number of assembly steps, and the number of processing steps can be reduced. Further, the notch 6 of the front wing 4 has a rectangular cross section and is simply opened rearward and downward, so that it can be formed relatively easily.
[0018]
4 and 5 show an example of attachment in the attachment structure 1 of the present embodiment when the front collar 4 has a lock mechanism. The lock mechanism includes a lock washer 11 fixed to the upper surface of the front wing 4, a play piece 12 provided on the front ledge 4 so as to be movable in the vertical direction, and a lock provided on the upper end bar (both not shown). Etc. The play piece 12 urges the play piece round bar 12a extending in the vertical direction, the play piece square bar 12b fixed to the upper end portion thereof, the play piece attachment 12c screwed to the lower end portion, and the play piece square rod 12b upward. It is composed of a lock spring 12d and the like. Although not shown in the drawings, in the conventional mounting structure of the forehead, the round bar 12a penetrates only the forward side, and the lug 12c is accommodated in a hole formed in the forward side. On the other hand, in the example shown in both drawings, a hole 8a penetrating in the vertical direction is formed in the pin plate 8 due to the fact that the forehead 4 is placed on the pin plate 8 in the present embodiment. In addition, the lower end portion of the round ball 12a is passed through, and the placket 12c is accommodated.
[0019]
Therefore, the play element 12 of the lock mechanism can be attached as in the conventional case. The operation of this locking mechanism is generally as follows. That is, in the unlocked state, the play piece 12 is held at a predetermined position on the upper side by the spring force of the lock spring 12d, and the play piece square bar 12b is fitted into the square hole 11a of the lock washer 11, and the upper surface thereof is While being in a state of being flush with each other, the play piece attachment 12c is retracted into the hole 8a of the pin plate 8 (state of FIG. 5). From this state, when the key is inserted into the lock of the upper end bar and operated, the lock knob (not shown) protrudes downward, presses the square slider bar 12b, and opposes the spring force of the lock spring 12d. By pushing down 12, the yoke is fitted into the square hole 11a of the lock washer 11. As a result, the upper mouth bar is locked with respect to the front rod 4, and the large roof (not shown) to which the upper mouth bar is integrally attached is held in a closed state. At the same time, the playholder 12c protrudes downward from the pin plate 8 and comes close to the back surface of the lid lid attached to the keyboard lid in a closed state (both not shown), so that the keyboard lid is closed. Locked. As described above, the operation of the lock mechanism can be performed in the same manner as in the prior art. [0020]
In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the embodiment, the front bar 4 is fixed to the pin plate 8 by using both adhesion and screwing from below, but may be performed by only one of them. As described above, since the front plate 4 is continuously mounted and supported on the pin plate 8 in the entire length direction by fitting the pin plate 8 into the notch 6, it can be bonded or Even when only one of the screws is fixed, the front collar 4 can be attached to the pin plate 8 sufficiently firmly. Moreover, the specific attachment procedure of the front heel 4 shown by embodiment is an illustration to the last, and of course is not restricted to this. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.
[0021]
【The invention's effect】
As described above, the front piano mounting structure of the grand piano of the present invention can reduce the number of parts and can firmly mount the front fan, thereby increasing the rigidity of the back mechanism. Have.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side view showing a front piano mounting structure of a grand piano according to an embodiment of the present invention.
FIG. 2 is a front view of the mounting structure of FIG.
FIGS. 3A and 3B are diagrams showing two examples of a method for producing a forehead. FIGS.
FIG. 4 is an exploded perspective view showing an example of attachment when the front wing has a lock mechanism.
FIG. 5 is a side sectional view corresponding to FIG. 4;
FIG. 6 is a side view showing a mounting structure of a front gutter of a conventional grand piano.
7 is a front view of the mounting structure of FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mounting structure of forehead 2 Loading 3 Arm 4 Front end 5 Screw 6 Notch 8 Pin plate 9 Frame 10 Screw

Claims (1)

A mounting structure of the front piano for mounting a grand piano for attaching a front to be provided between the left and right arms formed on the left and right front ends of the pile,
On the rear side of the left and right arms, a pin plate having both ends fixed to the left and right front portions of the pile is provided to extend in the left-right direction, and a frame is fixed to the pin plate,
A notch opening rearwardly and downwardly is formed in the lower part of the front saddle so as to extend continuously in the length direction, and the front saddle is placed on the front end of the pin plate fitted in the notch. The ground piano is fixed to the front end of the pin plate by bonding and / or screwing from below, and both ends are screwed to the back of the left and right arms. Mounting structure on the front.

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