keyboard instruments

Abstract

A keyboard musical instrument (10) includes an instrument case (20) comprising an upper case (21) and a lower case (22). The lower case (22) is provided with a recess (25) on its lower surface (22a) with its outer peripheral surface side open. A strap pin fixing portion (250) is arranged in the recess (25). In addition, at least one connecting bolt (260) of a plurality of connecting bolts connecting the upper case (21) and the lower case (22) is arranged in the recess (25).

Description

Technical Field

[0001] The present invention relates to keyboard musical instruments. Background Art

[0002] Keyboard instruments have been disclosed that include strap pins for attaching a strap. These straps can be hung from a shoulder to carry the keyboard instrument, for example. These strap pins are sometimes located on the side or bottom of the keyboard instrument. For example, Japanese Patent Application Publication No. 2003-528385 discloses a keyboard instrument with strap pins on the side of the instrument.

[0003] If a sling pin is provided on the side of the keyboard instrument, the width of the sling may abut against the upper surface of the table when the keyboard instrument is placed on a table, making the keyboard unstable. Furthermore, if the sling pin is provided on the bottom surface of the keyboard instrument, the sling may be caught between the mounting member on the bottom surface of the keyboard instrument abutting against the upper surface of the table and the upper surface of the table. Consequently, the sling may have to be removed when placing the keyboard instrument on the table. Summary of the Invention

[0004] A keyboard musical instrument according to one aspect of the present invention includes an instrument case including an upper case and a lower case. The lower case has a recessed portion whose outer peripheral surface is open. A strap pin fixing portion is disposed in the recessed portion.

[0005] According to the present invention, the portable computer can be stably installed on a table or the like even in a state where the strap is attached. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a perspective view of a keyboard instrument according to an embodiment of the present invention as viewed from the front.

[0007] Figure 2 It is a bottom view of the keyboard instrument according to the embodiment of the present invention.

[0008] Figure 3 It is an exploded perspective view of the periphery of the recessed portion of the keyboard instrument according to the embodiment of the present invention.

[0009] Figure 4 This is a plan view of the lower case of the keyboard instrument according to the embodiment of the present invention as viewed from above.

[0010] Figure 5 The keyboard instrument of the embodiment of the present invention is Figure 4 A cross-sectional view when observing the V-V cross section.

[0011] Figures 6A to 6C 1 is a bottom view showing a state where a strap is attached to the keyboard instrument according to the embodiment of the present invention. Figure 6AIndicates the situation where the sling is located at the front side. Figure 6B Indicates that the sling is located sideways. Figure 6C Indicates the situation where the sling is at the rear side.

[0012] Figure 7 This is a front view showing a state in which a strap is attached to the keyboard instrument according to the embodiment of the present invention and the keyboard instrument is placed on a table.

[0013] Figure 8 It is a plan view showing a modification of the keyboard musical instrument according to the embodiment of the present invention, when the lower case is viewed from above. DETAILED DESCRIPTION

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 The illustrated keyboard instrument 10 includes a 61-key keyboard 11 and an instrument case 20. In the following description, the front of the keyboard 11 in the key front-to-back direction FB is referred to as the front side F, the rear of the keyboard 11 in the key front-to-back direction FB is referred to as the rear side B, the left side of the keyboard 11 is referred to as the left side L, and the right side is referred to as the right side R. The keys of the keyboard 11 are arranged in the left-right direction LR. Furthermore, in the up-down direction UL of the keyboard instrument 10, the upper side is referred to as the upper side Up, and the lower side is referred to as the lower side Lo.

[0015] The instrument case 20 is a substantially long rectangular plate with its longitudinal direction being the left-right direction, and is divided into an upper case 21 and a lower case 22. The upper case 21 and the lower case 22 are each formed of a resin material. Inside the instrument case 20, a substrate and a battery serving as a power source are housed.

[0016] The keyboard instrument 10 includes an operation unit 12 on the rear upper surface of an instrument case 20, which allows for various settings and the like. Speaker units 13a and 13b are provided on the left side L and right side R of the operation unit 12, respectively. Although not shown, the speaker units 13a and 13b have multiple holes formed in the upper surface of the instrument case 20, and speakers are provided inside the instrument case 20 corresponding to these holes. Furthermore, fabric is attached to the speaker units 13a and 13b.

[0017] The lower case 22 is provided with a recessed portion 25 recessed from the lower surface 22a of the lower case 22 at the right front corner 23 and the left front corner 24 of the instrument case 20. Figure 2 As shown in FIG. 1 , each recess 25 is formed so that the outer peripheral surface side of the instrument case 20 close to each recess 25 is open. Specifically, as shown in FIG. Figure 2As shown in the portion P of FIG. 2 , the outer peripheral surfaces of the instrument case 20 proximate to the recess 25, namely, the right side 20b and the front surface 20c, are open. Furthermore, the recess 25 at the right front corner 23 is provided with walls 25b and 25c extending vertically from the bottom surface 25a of the recess 25. The wall 25b is provided on the left side 20a of the recess 25 at the corner 23. The wall 25c is provided on the rear surface 20d.

[0018] The recess 25 of the left front corner 24 is formed symmetrically with the recess 25 of the right front corner 23. Therefore, in the following description, the recess 25 of the right front corner 23 is described in detail, and the detailed description of the recess 25 of the left front corner 24 is omitted.

[0019] The wall portion 25b, which is longer in the front-to-back direction FB, is arranged approximately perpendicular to the front surface 20c of the instrument case 20 in a plan view (in other words, parallel to the left and right sides 20a and 20b). The wall portion 25c, which is longer in the left-to-right direction (key arrangement direction LR), is inclined toward the rear surface 20d relative to the perpendicular direction of the wall portion 25b (in other words, the front and rear surfaces 20c and 20d) in a plan view. In other words, the outer side (right side 20b side) of the bottom surface 25a of the recess 25 is longer in the front-to-back direction FB than the inner side (wall portion 25b side). In this embodiment, the inclination angle of the wall portion 25c relative to the front surface 20c is approximately 64 degrees. The intersection 25d of the wall portions 25b and 25c is R-shaped in a plan view.

[0020] In other words, the front side 20c of the recess 25 in the key front-back direction is open, and the outer side 20b in the key arrangement direction is open. Furthermore, the recess 25 has a wall portion 25c on the rear side in the key front-back direction, and a wall portion 25b on the inner side in the key arrangement direction.

[0021] A mounting portion 28 is provided near the recess 25, or in other words, near the wall portion 25b, on the lower surface 22a of the lower case 22. The mounting portion 28 is formed of an elastic material such as rubber and is the portion that contacts the upper surface of the table when the keyboard instrument 10 is placed on the table. Furthermore, the mounting portion 28 is provided not only near the recess 25 but also near the front-to-back center, corner 26 of the rear side B on the right side R, and corner 27 of the rear side B on the left side L. Furthermore, a recessed grip portion 29 is provided approximately in the left-right center of the lower surface 22a of the lower case 22, near the rear surface 20d.

[0022] The bottom surface 25a of the recessed portion 25 is provided with a strap pin fixing portion 250 for securing the strap pin 251, and a connecting bolt 260. The connecting bolt 260 disposed in the recessed portion 25 is one of the multiple connecting members that connect the upper case 21 to the lower case 22. Specifically, in addition to the connecting bolt 260 in the recessed portion 25, five connecting bolts 270 are disposed along the front surface 20c on the front side F of the instrument case 20, and four connecting bolts 280 are disposed along the rear surface 20d on the rear side B. Two connecting bolts 260 and 290 are disposed along the left side 20a and right side 20b, respectively, on the left side L and right side R. The connecting bolts 290 are disposed near the corners 26 and 27 of the rear side B. The arrangement direction of the two fastening bolts 260 and 290 arranged on the front side F and the rear side B of the left side L and the right side R is orthogonal to the arrangement direction of the plurality of fastening bolts 270 and 280 arranged on the front side F and the rear side B in the left-right direction.

[0023] The fastening bolt 260 provided in the recess 25 is provided near the intersection 25d where the wall portions 25b and 25c of the recess 25 intersect. Figure 2 P part and Figure 5 As shown in FIG, a connecting bolt 260 is provided in a boss-shaped connecting bolt counterbore portion 261 extending deep from the bottom surface 25a of the recessed portion 25 toward the interior of the instrument case 20. The connecting bolt 260 is screwed into a female thread portion 262 provided in a boss-shaped manner on the inner surface of the upper case 21, corresponding to the connecting bolt counterbore portion 261. A bowl-shaped annular guide portion 261a is provided on the boss-shaped upper surface of the connecting bolt counterbore portion 261 to guide the female thread portion 262 when engaging with the boss-shaped female thread portion 262.

[0024] The strap pin fixing portion 250 is as follows Figure 2 P part and Figure 3 As shown, it is arranged outside the connecting bolt 260 relative to the instrument case 20. Specifically, it is provided near the edge of the bottom surface 25a of the recessed portion 25, near the intersection of the right side 20b and the front surface 20c (i.e., near the edge of the corner 23).

[0025] like Figure 3 As shown, a suspender pin 251 is secured to the suspender pin fixing portion 250 by a mounting bolt 252. The suspender pin 251 comprises a conical portion 251a with its conical top facing the instrument case 20, a substantially cylindrical connecting portion 251b connected to the top of the conical portion 251a, and a disc-shaped seat portion 251c having a predetermined thickness and connected to the connecting portion 251b. The suspender pin 251 is provided with a through-hole 251d extending axially therethrough.

[0026] The bottom surface 25a of the recessed portion 25 is provided with a sling pin countersunk portion 253 having a circular planar shape for arranging the seat portion 251c of the sling pin 251. Figure 5 As shown, a female thread portion 254 is provided coaxially with the sling pin countersunk portion 253 within the lower housing 22, corresponding to the sling pin countersunk portion 253. The female thread portion 254 is provided in a boss-like manner within the lower housing 22, as will be described later. A bolt 252 for attaching the pin member 251 is inserted through the through-hole 251d of the pin member 251 and screwed into the female thread portion 254.

[0027] like Figure 4 As shown and part of Figure 5 As shown, inside the lower housing 22, the boss-shaped female thread portion 254 has a plurality of first ribs 255. In this embodiment, eight first ribs 255-1 to 255-8 are radially arranged around the female thread portion 254. Of the plurality of first ribs 255, first ribs 255-1 to 255-4 are connected to the outer peripheral wall portion 22b extending vertically along the outer periphery of the lower housing 22. In other words, the first ribs 255-1 to 255-4 closest to the outer peripheral wall portion 22b are directly connected to the outer peripheral wall portion 22b.

[0028] Of the first ribs 255-5 to 255-8 located farther from the outer peripheral wall 22b, the first ribs 255-5 and 255-7 are not connected to any upright structure (ribs, etc.) within the lower case 22. Of the first ribs 255-5 to 255-8 located farther from the outer peripheral wall 22b, the first rib 255-6 extending toward the left side L, which is the inside of the lower case 22, is connected to the cylindrical portion 220, described later. Of the first ribs 255-5 to 255-8 located farther from the outer peripheral wall 22b, the first rib 255-8 extending toward the rear side B, which is the inside of the lower case 22, is connected to the rib 221 extending from the right side 20b toward the left side L, which is the inside of the lower case 22, and curving toward the front side F. None of the first ribs 255 - 5 to 255 - 8 that are distant from the outer peripheral wall portion 22 b is directly connected to the countersunk hole portion 261 for fastening bolts.

[0029] The fastening bolt countersunk portion 261 also includes a second rib 263. The second rib 263 is located on the front side F of the fastening bolt countersunk portion 261. The second rib 263 includes an arcuate rib 263a connected to the fastening bolt countersunk portion 261 at both ends, and a linear rib 263b connected to the arcuate rib 263a. The linear rib 263b is connected to the cylindrical portion 220.

[0030] In addition, the cylindrical portion 220 may also be Figure 8 In this case, the first rib 255 - 6 connected to the cylindrical portion 220 is not connected to any upright structure (ribs, etc.) inside the lower case 22 .

[0031] To the suspender pin 251 of the suspender pin fixing portion 250 of the keyboard instrument 10, as shown Figures 6A to 6C and Figure 7 As shown, the sling 100 can be attached. A known sling 100 can be used. The known sling 100 has a slit formed at its end, through which the sling pin 251 can be inserted. The slit of the sling 100 attached to the sling pin 251 is rotatably engaged with the connecting portion 251b of the sling pin 251.

[0032] Reference Figures 6A to 6C For example, when the keyboard instrument 10 is carried by hanging the strap 100 on the shoulder, Figure 6A As shown, the strap 100 extends forward. When the keyboard instrument 10 is placed on a table, as shown in FIG. Figure 6B As shown, the sling 100 can be moved to one side (in Figure 6B To the left side L), the sling 100 is extended to the left or right, or as Figure 6C The harness 100 can be looped around to the rear as shown.

[0033] like Figure 6C As shown in FIG. 1 , when the strap 100 is wound around the rear, the wall portion 25c of the recess 25 is inclined, so the strap 100 can be wound around the rear without interfering with the instrument case 20. In addition, the lower edges of the left side L and the right side R of the lower case 22 are provided with chamfered portions 22c that are chamfered into a concave arc shape in a front view (see also FIG. 1 ). Figure 7 ), so interference between the strap 100 and the instrument housing 20 (lower housing 22) is avoided.

[0034] In addition, if Figure 7 As shown, the strap pin 251 of the strap pin fixing portion 250 is arranged so that the height H1 from the bottom surface 25a of the recessed portion 25 to the front end of the strap pin 251 is smaller than the height from the bottom surface 25a to the upper surface D1 of the table, that is, the height H2 from the bottom surface 25a to the lowest surface of the instrument case 20, which serves as the contact surface of the setting portion 28. Therefore, even when the keyboard instrument 10 is set on a table, the strap 100 can be used without being sandwiched between the lower surface of the keyboard instrument 10 (the lower surface 22a of the lower case 22) and the upper surface D1 of the table, thereby preventing the keyboard instrument 10 from shaking or requiring the strap 100 to be removed to prevent such shaking. Furthermore, the strap pin 251 protrudes beyond the lower surface 22a of the lower case 22 to facilitate the attachment of the strap 100.

[0035] Furthermore, when the keyboard instrument 10 is carried by hanging the strap 100 on the shoulder, the load of the keyboard instrument 10 acts on the strap pin 251. Figure 5A shear load acts on the female thread portion 254 of the strap pin fixing portion 250 that is screwed with the bolt 252. Figure 4 The first ribs 255-1 to 255-4 connected to the outer peripheral wall portion 22b of the lower case 22 support the boss-shaped female screw portion 254. Figure 3 The outer peripheral wall portion 253 a of the illustrated sling pin counterbore portion 253 abuts against the side surface 251 c 1 of the seat portion 251 c of the sling pin 251 , thereby alleviating the shear load acting on the bolt 252 and the female thread portion 254 .

[0036] Furthermore, when the keyboard instrument 10 is dropped and an impact force is applied to the strap pin 251, Figure 4 The first ribs 255-5 to 255-8 shown support the female thread portion 254. At this time, since the first ribs 255-5 to 255-8 are not connected to other upright structures of the lower case 22, especially not connected to the countersunk portions 261 for connecting bolts provided in the same recess 25, the impact force applied to the sling pin 251 is reduced from being transmitted to the countersunk portions 261 for connecting bolts.

[0037] In addition, when the keyboard instrument 10 falls and an impact force is applied to the strap pin 251, even if the impact force is transmitted along the structure of the lower shell 22 to the countersunk portion 261 for the connecting bolt, the stress concentration at the connection portion between the second rib 263 (arc-shaped rib 263a) and the countersunk portion 261 for the connecting bolt is alleviated because the second rib 263 is connected to the countersunk portion 261 for the connecting bolt in two strands.

[0038] As described above, according to an embodiment of the present invention, the keyboard instrument 10 has an instrument case 20 including an upper case 21 and a lower case 22, the lower case 22 is provided with a recess 25 formed by opening the outer peripheral surface side of the left side 20a (or the right side 20b) and the front surface 20c, and a strap pin fixing portion 250 is arranged in the recess 25.

[0039] Therefore, even when the keyboard instrument 10 is placed on a table or the like with the strap pin 251 attached to the strap pin fixing portion 250 and the strap 100 attached to the strap pin 251 , the strap 100 is not pinched by the keyboard instrument 10 , and the keyboard instrument 10 can be placed stably.

[0040] Furthermore, a mounting portion 28 is provided near the recess 25 of the lower surface 22a of the lower case 22. This ensures a secure distance between the tip of the strap pin 251 attached to the strap fixing portion 250 and the ground contact surface.

[0041] The keyboard instrument 10 also includes fastening bolts 260, 270, 280, and 290 as fastening members for fixing the upper case 21 and the lower case 22. The fastening bolts 260 are arranged in the recess 25. This allows the fastening bolts 260, 270, 280, and 290 to be evenly arranged front-to-back and left-to-right.

[0042] The length of the recess 25 in the front-back direction FB is longer on the outside than on the inside. This allows the recess 25 to tilt its left-right wall 25c relative to the wall 25b, thereby increasing the rotation range of the strap 100.

[0043] Furthermore, the suspender pin fixing portion 250 includes a suspender pin countersunk portion 253. This allows the outer peripheral wall portion 253a of the suspender pin countersunk portion 253 to abut against the side surface 251c1 of the seat portion 251c of the suspender pin 251 attached to the suspender pin fixing portion 250. This allows the static load acting on the suspender pin fixing portion 250 (the load generated when the keyboard instrument 10 is hung on the shoulder via the suspender strap 100) to be more reliably supported.

[0044] Furthermore, a female threaded portion 254 for tightening the suspender pin 251 is provided in a boss-like manner within the lower case 22. The female threaded portion 254 has a plurality of first ribs 255-1 to 255-8. A countersunk portion 261 for a fastening bolt is provided in a boss-like manner within the lower case 22. None of the first ribs 255-1 to 255-8 is directly connected to the countersunk portion 261 for the fastening bolt. Consequently, even if the suspender pin 251 strikes the ground when the keyboard instrument 10 is dropped, the impact of the impact on the countersunk portion 261 for the fastening bolt is reduced.

[0045] Furthermore, the fastening bolt countersunk portion 261 includes a second rib 263 within the lower housing 22. The second rib 263 includes an arcuate rib 263a and a linear rib 263b, both ends of which are connected to the fastening bolt countersunk portion 261. This reduces stress concentration in the portion where the second rib directly connects to the fastening bolt countersunk portion 261.

[0046] Furthermore, recesses 25 are provided at two corners 23 and 24 on the keyboard 11 side (i.e., the front side F) of the instrument case 20. Thus, when the strap 100 is hung on the shoulder, the keyboard instrument 10 can be carried with the keyboard 11 side, which is easily damaged when dropped, facing upward.

[0047] While several embodiments of the present invention have been described, these embodiments are provided as examples and are not intended to limit the scope of the invention. These novel embodiments may be implemented in various other forms and may be omitted, replaced, or modified in various ways without departing from the spirit of the invention. These embodiments and their variations are intended to be included within the scope and spirit of the invention and within the scope of the invention set forth in the claims and their equivalents.

Claims

1. A keyboard musical instrument, characterized in that A musical instrument housing including an upper housing and a lower housing having a strap pin fixing portion, The lower shell has a recessed portion with an open outer peripheral surface side; The sling pin fixing portion is arranged in the recess; Inside the lower shell, a female threaded portion for tightening the sling pin is provided in a boss shape; The female thread portion has a plurality of first ribs; A countersunk hole portion for a connecting bolt of a connecting member for fixing the upper shell and the lower shell is provided in a boss shape inside the lower shell; The plurality of first ribs include first ribs that are not directly connected to the countersunk hole portions for the fastening bolts and first ribs that are connected to the outer peripheral wall portion of the lower case.

2. The keyboard musical instrument according to claim 1, wherein A setting portion is provided near the recessed portion of the lower case, and the setting portion is a portion on which the keyboard instrument abuts against a setting surface.

3. The keyboard musical instrument according to claim 1 or 2, wherein: A connecting member for fixing the upper shell and the lower shell; The connecting member is arranged in the recessed portion.

4. The keyboard musical instrument according to claim 1 or 2, wherein: The length of the key of the recessed portion in the front-rear direction is longer on the outer side than on the inner side.

5. The keyboard musical instrument according to claim 1 or 2, wherein: The sling pin fixing portion includes a countersunk portion for the sling pin.

6. The keyboard musical instrument according to claim 1, wherein The countersunk hole portion for the connecting bolt has a second rib inside the lower shell; The second rib includes an arcuate rib whose both ends are connected to the countersunk holes for the fastening bolts, and a linear rib extending from the arcuate rib.

7. The keyboard musical instrument according to claim 1 or 2, wherein: The recessed portions are provided at two corners on the keyboard side of the musical instrument case formed in the shape of a long rectangular plate.

8. The keyboard musical instrument according to claim 1 or 2, wherein: The recessed portion is open at the front side in the key front-rear direction and at the outer side in the key arrangement direction, and has a wall portion at the rear side in the key front-rear direction and at the inner side in the key arrangement direction.

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