JP5151147B2 - Electronic keyboard instrument housing structure - Google Patents

Description

  The present invention relates to a casing structure of an electronic keyboard instrument in which a casing is completed by rotating an upper case relative to a lower case and opening and closing and fixing the casing to the lower case in a closed state.

  2. Description of the Related Art Conventionally, in a case structure of an electronic keyboard instrument, an upper case and a lower case are configured separately, and both are fastened and fixed by fastening means. However, if the upper case and the lower case are completely separated until they are fastened, the upper and lower cases must be placed in separate locations when assembling at the manufacturing stage or during maintenance in service. The space is not efficient.

On the other hand, a housing structure is also known in which an upper case and a lower case are configured separately and are rotatably connected. For example, in Patent Document 1 below, the upper case can be opened and closed by rotating around the hinge at the rear portion with respect to the lower case, and the upper case is fixed to the lower case with a screw or the like in the closed state. The housing is complete.
Japanese Utility Model Publication No. 62-103382

  However, in the above-mentioned Patent Document 1, the upper case and the lower case are connected by a hinge. Therefore, after being connected once, it is not easy to release the connection and separate the two cases.

  For this reason, for example, it is difficult to dispose the parts disposed in the housing after the upper case is connected to the lower case with a hinge. Alternatively, there are cases where restrictions are imposed on the order of operations, such as the need to arrange parts before connection to the lower case.

  In addition, once the upper case and the lower case are connected with a hinge, for example, when it is desired to look inside the housing for maintenance, it is not easy to release the hinge connection. There is a problem of being bad.

  On the other hand, for example, when adopting a rotating part that rotatably connects the upper case and the lower case instead of a hinge, if the rotating part is unintentionally removed in the open state of the upper case, it is safe. Not. Moreover, if the said rotation part remove | deviates unintentionally in the closed state of an upper case, the position of both cases will shift | deviate and it will become difficult to perform work, such as subsequent fastening.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is to make the upper case that can be rotated easily detachable from the lower case only in a half-open state, during assembly and maintenance. An object of the present invention is to provide a casing structure for an electronic keyboard instrument that can improve work efficiency and safety.

In order to achieve the above object, the casing structure of the electronic keyboard instrument according to claim 1 of the present invention has a casing (10) composed of a separate lower case (40) and upper case (20). And a case structure of an electronic keyboard instrument in which the case is completed by rotating the upper case relative to the lower case so that the upper case can be opened and closed, and the upper case is fixed to the lower case in a closed state. a is fixedly projecting from the projecting rear end portion of the lower case from (41) to the rear end portion so as to be tilted upward obliquely rearward and (61), after the previous SL upper case and a engaging hole (28) provided on the end portion, the projecting portion in a state where the engaged through engagement with the engagement hole, the rotation center portion (C1) to which it is engaged The upper case is rotatable in the opening / closing direction with respect to the lower case, and the rotation stroke when the upper case is opened / closed At a predetermined rotation angle in the medium alone, relatively inserted and removed capable constructed by translating the projected portion in the protruding direction of the projecting portion relative to the engagement hole, the said upper case The rear end portion is formed in a bowl shape in a side view, and in the closed state of the upper case, the projecting portion is housed in the hook-shaped portion of the rear end portion of the upper case and is externally It is characterized by not being exposed to .

  Preferably, the projecting portion includes a narrow portion (61a) and a wide portion (61b) longer in the key arrangement direction than the narrow portion on the tip side of the narrow portion, and the engagement hole A wide corresponding part (28b) having a width through which the wide part of the projecting part can be inserted, and a narrow corresponding part (28a) having a width through which the wide part cannot be inserted and the narrow part can be inserted. ) And the upper case is in a posture corresponding to the predetermined rotation angle, and the upper case is relatively moved in the projecting direction of the projecting portion. The wide portion can be inserted into and removed from the corresponding portion, and in the opened state of the upper case, the protrusion portion with respect to the engagement hole is engaged by the engagement between the wide portion and the narrow corresponding portion. It is configured so that relative insertion and removal in the projecting direction of the projecting portion is prevented ( Motomeko 2).

Preferably, in the closed state before SL on case, the engagement between the rear portion of the upper case and the rear end portion of the lower case, on the side that is tilted out of the front and rear of the projecting portion Due to the cooperation of the engagement between the surface (61x) and the engagement hole, relative insertion / removal of the projecting portion with respect to the engagement hole in the projecting direction of the projecting portion is prevented. (Claim 4).

Preferably, in the open state before Symbol upper case, and engagement (P1) of the narrow corresponding portion of the engaging hole and the narrow portion of the projecting portion, the rear end portion of the upper case The upper case is configured to be maintained in the open state by the cooperation of both the direct and indirect engagement (P2) of the lower case with the rear surface of the rear end portion of the lower case ( Claim 5).

  In addition, the code | symbol in the said parenthesis is an illustration.

  According to the first aspect of the present invention, the rotatable upper case can be easily detached from the lower case only in the half-open state, and the efficiency and safety of work during assembly and maintenance can be improved.

  According to claim 2, it is possible to avoid the upper case from being unintentionally detached in the open state.

According to claim 4 , it is possible to prevent the upper case from being unintentionally detached in the closed state.

According to claim 5 , workability and safety can be improved by allowing the upper case to be stably supported in the open state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1A is a plan view of an electronic keyboard instrument to which a housing structure according to an embodiment of the present invention is applied, and FIG. 1B is a rear view of the electronic keyboard instrument. In this electronic keyboard instrument, the side on which the keyboard part KB is located is the “front side” where the player is located, and hereinafter, the left and right direction will be referred to the player. The casing 10 of the electronic keyboard instrument is configured by assembling an upper case 20 to a lower case 40, and arms 70 (70L, 70R) are attached to the left and right sides of the casing 10.

  FIG. 2A is a right side view of the electronic keyboard instrument showing a state in the middle of assembling the upper case 20 to the lower case 40. FIG. 2B is a perspective view of the right half of the electronic keyboard instrument showing a state before the upper case 20 is temporarily assembled and fastened to the lower case 40. 2A and 2B, the arm 70 is still in a state before being assembled.

  3A is a plan view of the right part of the electronic keyboard instrument in a state before the upper case 20 is temporarily assembled and the arm 70 is assembled, and FIG. 3B is a right side view of the electronic keyboard instrument in the same state. is there. FIG. 3C is a plan view of the right part of the electronic keyboard instrument in a state after the upper case 20 and the arm 70 are assembled, and FIG. 3D is a right side view of the electronic keyboard instrument in the same state.

  The upper case 20 and the lower case 40 are made of metal, but may be made of resin. The upper case 20 is configured separately from the lower case 40. When the upper case 20 is attached to the lower case 40, the upper case 20 is mainly rotated at two places on the left and right sides of the upper portion of the back plate 41 that is the rear end portion of the lower case 40 and the rear end portion 20 a of the upper case 20. A moving part C1 is configured (see FIG. 1B, FIG. 2A, and FIG. 3B). The front end of the upper case 20 is rotatable in the opening / closing direction with respect to the lower case 40 around the rotating portion C1, and the upper case 20 is in the second half of the lower case 40 in the mounted state. Located above the section. Here, the clockwise direction in FIG. 2A is the opening direction of the upper case 20. The configuration of the rotation unit C1 will be described later with reference to FIGS.

  4A is a plan view of the left part of the electronic keyboard instrument in a state before the upper case 20 and the arm 70 are assembled, and FIG. 4B is a state after the upper case 20 is assembled and before the arm 70 is assembled. FIG. 4C is a plan view of the left part of the electronic keyboard instrument in a state after the upper case 20 and the arm 70 are assembled.

  As shown in FIGS. 1 and 2B, the keyboard part KB is provided in the lower case 40, and the timepieces 44 and 45 are fixedly disposed on the left and right sides of the keyboard part KB in the lower case 40. . A plurality of screw holes 46 for attaching the arm 70R are provided in the right side surface 42R of the lower case 40 along the left-right direction (see FIG. 2B). A plate-like lower flange 47R extends from the right side surface 42R (see FIGS. 2, 3A and 3B). The lower flange 47R is preferably made of metal and fixedly provided to the right side surface 42R. However, when the lower case 40 is made of metal, it is preferably formed integrally with the lower case 40.

  As shown in FIGS. 4A and 4B, a lower flange 47 </ b> L extends on the left side surface 42 </ b> L of the lower case 40. The left side surface 42L and the lower flange 47L are similarly configured symmetrically with the right side surface 42R and the lower flange 47R. Each lower flange 47 is formed with a plurality of screw holes 48 penetrating in the vertical direction (see FIG. 4A).

  On the left and right sides of the upper case 20, a left side portion 25L / right side portion 25R parallel to the front and rear direction and the vertical direction are provided (see FIGS. 2, 3B, and 4B). As shown in FIGS. 2 and 3B, the right side portion 25R is provided with a plurality of screw holes 26 for attaching the arm 70R along the left-right direction. The right side portion 25R is preferably made of metal, and is fixedly provided to the upper plate portion 21 of the upper case 20. However, when the upper plate portion 21 is made of metal, it is formed integrally with the upper plate portion 21. Is preferred.

  A lower portion of the right side portion 25R in the assembled state of the upper case 20 is an upper flange 27R that is bent rightward and extends rightward. The lower portion of the left side portion 25L is an upper flange 27L that is bent leftward and extends leftward. The left side portion 25L and the upper side flange 27L are configured similarly to the right side portion 25R and the upper side flange 27R symmetrically. Each upper flange 27 is formed with a fastening hole 30 corresponding to the screw hole 48 of the lower flange 47 (see FIGS. 2B and 3A).

  When the upper case 20 is assembled and fixed to the lower case 40, the upper flange 27L / 27R is brought into an abutting contact state with the lower flange 47L / 47R (see FIGS. 2B and 3B). Then, the upper case 20 is fixed to the lower case 40 from above by screwing the screws 49 into the screw holes 48 through the fastening holes 30 (see FIG. 4B). Since the screw 49 can be screwed in with the upper case 20 facing up, the screw can be screwed in with an appropriate horizontal position of the upper case 20 visually.

  On the surface side of the upper plate portion 21 of the upper case 20, the display screen portion 12 and a large number of operation element groups 11 are disposed (see FIG. 2B). A substrate (not shown) is disposed on the back side of the upper plate portion 21 of the upper case 20, and the operator group 11 is disposed on the substrate and exposed to the surface side of the upper plate portion 21. (See FIG. 1). In addition, a part of the operator group 11 is configured such that a fader operator 14 is attached from the surface side of the upper plate portion 21 to a fader attachment portion 13 disposed on the substrate (FIG. 4B). (See (c)).

  5A is a right side view showing the front side of the arm 70R, FIG. 5B is a left side view showing the back side of the arm 70R, and FIG. 5C is AA of FIG. 5A. It is sectional drawing which follows a line. The arm 70 </ b> R and the arm 70 </ b> L are similarly configured symmetrically, and are configured separately from the housing 10.

  The brace 70R has a notch 70b formed in the lower part of the central portion in the longitudinal direction, and the notch 70b becomes a gripping part to be put on when holding the electronic keyboard instrument after being mounted on the casing 10. The arm 70R is integrally formed of resin with a mold. A plurality of fastening holes 71 are formed in the arm 70R so as to correspond to the screw holes 26 of the right side portion 25R of the upper case 20 and the screw holes 46 of the right side surface 42R of the lower case 40 shown in FIG. (See FIGS. 5A and 5B).

As shown in FIG. 5C, the arm 70R is formed with a concave relief 70a along the longitudinal direction in the upper half. When the brace 70R is attached to the housing 10,
The upper flange 27R and the lower flange 47R are fitted into the escape portion 70a without interference. Further, as shown in FIG. 5B, a plurality of ribs 72 and 73 for securing rigidity are formed on the left side (back side) of the arm 70R.

  FIG. 6 is a longitudinal sectional view showing a configuration of one rotating portion C1 (see FIG. 1B, etc.) when the upper case 20 is in an open state. Here, the state shown in FIG. 6 is a fully open state in which the upper case 20 is rotated most in the opening direction around the rotation part C1, and this is referred to as an “open state”. On the other hand, the state shown in FIG. 2B is a fully closed state in which the upper case 20 is most rotated in the closing direction, and this is referred to as a “closed state”.

  FIG. 7A is a plan view of a portion provided in the lower case 40 in one rotating portion C1, FIG. 7B is a cross-sectional view taken along line BB in FIG. 7A, and FIG. c) is a rear view of the portion provided in the lower case 40. FIG. FIG. 6 corresponds to a cross-sectional view taken along the line BB in FIG. Although the rotation part C1 is provided in two places spaced apart in the left-right direction, you may provide three or more. The two rotating parts C1 have the same configuration, but may be symmetrical.

  As shown in FIG. 6, the rotating portion C <b> 1 is configured by the upper portion of the back plate portion 41 of the lower case 40, the horizontal portion 50, the rear end portion 20 a of the upper case 20, and the plate 60. The rear end portion 20a of the upper case 20 is composed of a first bent portion 22, a second bent portion 23, and a third bent portion 24, and is integrally bent into a bowl shape as a whole. The first bent portion 22 is connected to the upper plate portion 21 of the upper case 20, and the second bent portion 23 and the third bent portion 24 are connected to the first bent portion 22 in this order. In a side view, the first bent portion 22 forms an obtuse angle on the inner side (front side in the open state) with respect to the upper plate portion 21, the second bent portion 23 is substantially perpendicular to the upper plate portion 21, and the third The bent portion 24 has an angle of about several tens of degrees with respect to the upper plate portion 21 so as to approach the upper plate portion 21 toward the tip.

  As shown in FIG. 4A, FIG. 6, and FIG. 7, a horizontal plate-like horizontal portion 50 is provided from the upper end portion of the back plate portion 41 of the lower case 40 toward the front. As long as the horizontal part 50 is fixed to the back plate part 41, the horizontal part 50 may be integrated with the back plate part 41 or may be separate. In the horizontal portion 50, rectangular holes 52 that are long in the key arrangement direction are formed in portions corresponding to the respective rotating portions C1. In addition to the rectangular holes 52, rectangular holes 51 are formed in the horizontal portion 50 at a plurality of locations including the left and right end portions (see FIG. 4A).

  The plate 60 is attached to the rear surface of the back plate 41 with two screws 62 at positions corresponding to the rectangular holes 52 (see FIGS. 1B, 4A, 6, and 7). As shown in FIG. 7 (b), the upper portion of the plate 60 is bent obliquely (about 45 °) on the rear side to form an engagement projecting portion 61. The portion including the bent position (bending position 61x) in the engagement projecting portion 61 is a narrow portion 61a having a "<" shape when viewed from the side, and the tip portion is inclined from the narrow portion 61a. However, the wide portion 61b is straight in a side view.

  As shown in FIGS. 7A and 7C, the narrow portion 61a extends from the right half of the plate 60, and the wide portion 61b is formed longer on the left side in the key arrangement direction than the narrow portion 61a. Has been. The plate 60 is preferably made of metal and may be fixed to the back plate 41 and may be formed integrally with the back plate 41.

  8A, FIG. 9A, and FIG. 10A are plan views of the rotating portion C1, and FIG. 8B, FIG. 9B, and FIG. It is sectional drawing which follows the CC line of FIG. 9 (a), FIG. 9 (a), and FIG. 10 (a), DD line, and EE line. 8 and 10 show the open state and the closed state of the upper case 20, respectively, and FIG. 9 shows the state (half-open state) at the start of assembly of the upper case 20 or during the turning stroke for opening and closing. Yes. The upper case 20 is assembled and fixed to the lower case 40 in the closed state.

  The third bent portion 24 of the upper case 20 is formed over the entire width of the upper case 20 along the key arrangement direction, and a portion corresponding to the rotating portion C1 is substantially on the opposite side of the upper plate portion 21. The bent piece 29 is bent at a right angle (see FIGS. 6, 8B, 9B, and 10B). As shown in FIG. 9A, the bent piece 29 in the open state of the upper case 20 is formed in a shape corresponding to the rectangular hole 52, and the extension length and the length in the key arrangement direction are as follows. The length of the rectangular hole 52 in the front-rear direction and the length in the key arrangement direction are slightly shorter.

  Further, although not shown, a bent piece that is bent in the same manner as the bent piece 29 is formed in a portion of the third bent portion 24 corresponding to the rectangular hole 51 (see FIG. 4A). .

  As shown in FIGS. 6 and 8 to 10, the engagement hole extends from the root portion 24 a of the third bent portion 24, which is closer to the second bent portion 23 than the bent piece 29, to the root of the bent piece 29. 28 is formed. In other words, the wide corresponding portion 28b is formed at the root portion 24a of the third bent portion 24, the narrow corresponding portion 28a is formed at the root of the bent piece 29, and the wide corresponding portion 28b and the narrow corresponding portion 28a are connectedly formed. One engagement hole 28 is formed.

  The wide corresponding portion 28b is longer to the left than the narrow corresponding portion 28a in the key arrangement direction. That is, in the key arrangement direction, the wide corresponding portion 28b is slightly longer than the wide portion 61b of the engaging protrusion 61, and the wide portion 61b can be inserted therethrough. In addition, the narrow corresponding part 28a is sufficiently shorter than the wide corresponding part 28b to the wide part 61b, the wide part 61b cannot be inserted, and is slightly longer than the narrow part 61a so that the narrow part 61a can be inserted. is there.

  The bent piece 29 is formed with a screw hole 29a (see FIGS. 8A and 9A). On the other hand, a fastening hole 53 is formed in the back plate portion 41 of the lower case 40 corresponding to the screw hole 29a (see FIG. 7A). When the upper case 20 is in the closed state, the bent piece 29 comes into abutment with the front surface of the back plate portion 41 (see FIG. 10). In this state, the bent piece 29 is fixed to the back plate portion 41 by the screw 54 through the fastening hole 53 and the screw hole 29a (FIGS. 1B, 7C, and 10A). )reference). Similarly, a screw hole and a fastening hole are also formed in the bent piece (not shown) corresponding to the rectangular hole 51 (see FIG. 4A) of the third bent portion 24 and the back plate portion 41, respectively. It is provided and fastened with screws 15 (see FIG. 1B). Therefore, the upper case 20 is closed and fixed to the lower case 40 from the rear side by the two screws 54 and the plurality of screws 15.

  When the upper case 20 is disposed, components such as a substrate (not shown) described above are mounted in the upper case 20 in advance, and various components are disposed in the lower case 40. The upper case 20 is assembled to the lower case 40 as follows.

  First, as shown in FIG. 9 (b), an acute angle surface formed by the bent piece 29 of the upper case 20 and the root portion 24 a of the third bent portion 24 protrudes from the engaging protrusion 61. Approaching along the direction, the wide portions 61b of the corresponding engagement protrusions 61 are inserted and engaged together with the wide corresponding portions 28b of the engagement holes 28 of the two left and right bent pieces 29. At this time, the acute angle side surface formed by the bent piece 29 and the root portion 24a has a “<” shape when viewed from the side, and performs an engagement guide function.

  When the upper case 20 is displaced until the wide portion 61b passes through the wide corresponding portion 28b and the third bent portion 24 contacts the back plate portion 41, the engaging hole 28 engages with the narrow portion 61a. 9B, the upper case 20 engages with the engagement hole 28 if the upper case 20 is moved forward and backward along the protruding direction of the wide portion 61b of the engagement protrusion 61 in the posture or the rotation angle shown in FIG. It is possible to freely engage and disengage the projecting portion 61.

  There is an allowable range of about 20 ° in the rotation angle of the upper case 20 that can be freely inserted / released as described above, and the range includes the bent piece 29 and the wide portion 61b in the right side view. Is a rotation angle range from an angular position in parallel to about 20 ° clockwise in FIG. 9B. Hereinafter, this is referred to as a “detachable angle range”. Therefore, the upper case 20 is attached to and detached from the lower case 40 in a posture corresponding to this detachable angle range during product assembly and maintenance.

  In a state where the engagement projecting portion 61 is inserted and engaged in the engagement hole 28 (FIGS. 9A and 9B), the rotation operation in the opening / closing direction with respect to the lower case 40 of the upper case 20 is performed by the narrow portion. This is done in a state in which the positions in the key arrangement direction of 61a and the narrow corresponding portion 28a are associated with each other. That is, it is made in a state where the right end of the engagement protrusion 61 is brought close to or in contact with the right end of the engagement hole 28. Since the engaging hole 28 and the engaging projecting portion 61 are engaged in the inserted state to constitute the rotating portion C1, the upper case 20 does not fall off, and the tip of the upper case 20 is It can be opened and closed with light force.

  In order to close the upper case 20, the upper case 20 is rotated counterclockwise in FIG. 9B. Then, as shown in FIGS. 10A and 10B, the tip side half 24b of the third bent portion 24, which is the opposite side of the root portion 24a with respect to the bent piece 29, eventually becomes the lower case 40. The bent piece 29 comes into contact with and abuts against the front surface of the back plate 41. In addition, the lower flange 47L / 47R and the upper flange 27L / 27R also face each other (see FIGS. 2B and 3B).

  In this closed state, as shown in FIG. 10, the wide corresponding portion 28 b of the engagement hole 28 is engaged with the narrow portion 61 a of the engagement projecting portion 61. However, in addition to the above-described contact between the bent piece 29 and the front surface of the back plate portion 41, the bent position of the edge corresponding to the root portion 24 a and the rear surface of the engaging protrusion 61 of the wide corresponding portion 28 b 61x is in contact. As a result, even if the upper case 20 is moved away in the protruding direction of the wide portion 61b in this posture, the upper case 20 cannot be displaced, and the closed state of the upper case 20 is stably maintained.

  That is, the upper case 20 cannot be displaced rearward due to the contact between the bent piece 29 and the back plate portion 41. Further, the end portion of the base portion 24a on the wide-corresponding portion 28b side is in contact with the bending position 61x, and the portion above the bending position 61x of the engaging protrusion 61 is bent obliquely rearward. Therefore, the upper case 20 cannot be displaced forward or straight upward. It goes without saying that the third bent portion 24 abuts on the upper end of the back plate portion 41 and the upper case 20 cannot be displaced downward. As a result, it can be said that the rear end portion 20a of the upper case 20 is locked so as not to be displaceable in the front-rear direction and the vertical direction in the rotation portion C1, and the upper case 20 is not intended to be unintentionally removed from the lower case 40 in the rotation portion C1. Never come off. Thus, since the upper case 20 is in a temporarily fixed state, the subsequent fastening operation is easy to do.

  In this closed state, screws 54 and 15 (see FIG. 1B and FIG. 7C) are screwed together from the rear side in the back plate portion 41. Further, the lower flange 47 and the upper flange 27 are screwed and fixed from above with screws 49 (see FIG. 4B). Thus, the upper case 20 is fixed to the lower case 40 from the rear side and the upper side. Further, work such as attaching the fader operation element 14 to the fader attaching portion 13 is performed (see FIGS. 4B and 4C).

  When the upper case 20 is fixed to the lower case 40 and the housing 10 is configured, the brace 70 is attached. First, the arms 70L and 70R are brought close to the housing 10 from both the left and right sides, and the escape portions 70a are positioned so as to cover the corresponding upper flange 27 and lower flange 47. Then, from both the left and right sides, through the fastening holes 71 (see FIGS. 5A and 5B), the screws 74 in the upper case 20 and the screw holes 46 in the lower case 40 (see FIG. 2B). The arms 70L and 70R are fixed by screwing to (see FIG. 3 (b)) (see FIGS. 3 (d) and 4 (c)).

  By the way, after the product is completed, it may be necessary to remove the upper case 20 for maintenance or the like. In that case, first, the arm 70 is removed, and the screws 54 and 15 (see FIG. 1B and FIG. 7C) are removed. Then, the upper case 20 is rotated in the opening direction, and is rotated until the root portion 24a of the third bent portion 24 comes into contact with the plate 60 at the contact portion P2, as shown in FIG.

  At this time, the narrow-corresponding portion 28a of the engagement hole 28 is engaged with the narrow-width portion 61a of the engagement projecting portion 61, and the edge of the folded piece 29 (folded piece) of the narrow-width portion 61a. 29, the end portion on the narrow portion 61a side) abuts the front surface of the narrow portion 61a at the abutment portion P1. This state is an open state of the upper case 20, and the third bent portion 24 and the upper plate portion 21 are inclined slightly rearward from the vertical direction.

  When the upper case 20 is in the open state, the narrow corresponding portion 28a is engaged with the narrow portion 61a. Therefore, even if the upper case 20 is to be moved upward, the narrow corresponding portion 28a becomes the wide portion 61b. The upper case 20 cannot be moved any more by interfering with the lower end of the upper case. Further, the upper case 20 cannot be displaced backward due to the contact at the contact portion P1, and cannot be displaced forward due to the contact at the contact portion P2. Furthermore, it goes without saying that the third bent portion 24 contacts the upper end of the back plate portion 41 and the upper case 20 cannot be displaced downward. As a result, it can be said that the rear end portion 20a of the upper case 20 is substantially locked so as not to be displaceable in the front-rear and vertical directions in the rotating portion C1, and the upper case 20 is separated from the lower case 40 in the rotating portion C1. It will not come off unintentionally.

  Here, the center of gravity of the upper case 20 in the open state is located on an extension line of the vertical line L2 shown in FIG. 6, and is rearward of the plate 60 in the front-rear direction (the third bent portion 24 and the upper plate part 21 in the front-rear direction). Between). Therefore, a rotating moment in the clockwise direction is applied to the rotating portion C1 due to the weight of the upper case 20. In the contact portions P1 and P2, a reaction force is generated that balances this rotational moment.

  Therefore, the upper case 20 has a structure that maintains a stable posture even if the hand is released in the open state. Therefore, in the open state, the upper case 20 does not rotate unintentionally in the closing direction. Therefore, during maintenance or the like, the upper case 20 can be kept open, and operations such as inspection and replacement of parts disposed in the lower case 40 can be performed safely. From the viewpoint of stably supporting the upper case 20 in the open state, it is preferable that the vertical distance L1 between the contact portions P1 and P2 is longer.

  In the present embodiment, in the open state of the upper case 20, the root portion 24a of the third bent portion 24 of the rear end portion 20a contacts the plate 60 at the contact portion P2 (see FIG. 6). The root portion 24 a indirectly contacts the rear surface of the back plate portion 41 of the lower case 40 via the plate 60. However, when the plate 60 is formed integrally with the back plate portion 41, the root portion 24 a comes into direct contact with the back plate portion 41.

  Even in the product assembly process, the parts are not arranged in the lower case 40 in a state where the upper case 20 is completely separated from the lower case 40 but the upper case 20 is engaged by the rotating portion C1. You may make it carry out in the state maintained by making it open. Thus, there is a degree of freedom in the organization of work processes.

  By the way, the angle at which the plate 60 is bent rearward at the engaging protrusion 61, that is, the angle of the wide portion 61b with respect to the vertical direction is about 45 °, but is larger than 0 ° and smaller than 90 °. It can be set within the range of angles.

  That is, when the upper case 20 is translated in the projecting direction of the wide portion 61b with respect to the engaging projecting portion 61 only at a predetermined pivot angle during the pivoting stroke when the upper case 20 is opened / closed, It suffices if the wide portion 61b can be inserted into and removed from the joint hole 28. The predetermined rotation angle is the “removable angle range” described above. Particularly in the state close to the closed state (see FIG. 10), in addition to the contact between the wide corresponding portion 28b of the engagement hole 28 and the bending position 61x of the engagement protrusion 61, the bent piece 29 and the back plate Since the contact with the portion 41 functions to prevent the engagement between the engagement projecting portion 61 and the engagement hole 28, the “removable angle range” is set in consideration of these as well. What is necessary is just to design so that it may be ensured.

  According to the present embodiment, by moving the upper case 20 along the projecting direction of the wide portion 61b only in a posture corresponding to the attachable / detachable angle range, the wide corresponding portion 28b is provided with respect to the wide portion 61b. Since it can be relatively inserted and removed (see FIG. 9), the upper case 20 can be easily detached from the lower case 40 only in a half-open state, thereby improving the efficiency and safety of work during assembly and maintenance. it can.

  In particular, in the open state of the upper case 20 (see FIG. 8), the engagement between the wide portion 61b and the narrow corresponding portion 28a causes relative insertion and removal in the projecting direction of the wide portion 61b with respect to the engagement hole 28. Therefore, it is possible to avoid the upper case 20 from being unintentionally detached from the lower case 40 in the open state.

  In the closed state of the upper case 20 (see FIG. 10), the contact between the bent piece 29 and the front surface of the back plate portion 41 and the contact between the wide corresponding portion 28b and the bent position 61x are both balanced. By cooperation of contact engagement, relative insertion / removal of the wide portion 61b in the projecting direction with respect to the engagement hole 28 is prevented, so that the upper case 20 is unintentionally detached from the lower case 40 in the closed state. It can be avoided.

  Furthermore, in the open state of the upper case 20, the upper case 20 is stably maintained in the open state by the cooperation of both contact engagements at the contact portions P1 and P2 (see FIG. 6). Safety can be improved.

  Also according to the present embodiment, the lower flange 47 of the lower case 40 and the upper flange 27 of the upper case 20 are screwed and fixed from above with screws 49 (see FIG. 4B), covering them. As described above, since the arm 70 is fixed from both the left and right sides, the upper case 20 can be fixed to the lower case 40 while being face up, and the screws 49 are not visible in the natural shape by the arm 70, thereby improving the appearance. it can. In particular, the escape portion 70a provided on the arm 70 covers the entire corresponding upper flange 27 and lower flange 47, so that the appearance can be further improved. Moreover, it is a structure which is easy to ensure electrical conduction compared with the structure which fixes an upper case and a lower case only with a hinge.

  The lower flange 47 and the upper flange 27 (see FIG. 2B) may be opposed to each other so that they can be fastened and fixed to each other in the closed state of the upper case 20, and take a plate-like form like a flange. That is not essential.

  The screw 49 (see FIG. 4B) is straight in the vertical direction, but may be slightly tilted as long as the screwing operation can be performed from above.

  Speaking only from the viewpoint of making the screw 49 invisible and improving the appearance, the arm 70 may be configured and arranged so as to cover at least the screw 49.

  The brace 70 is fastened to both the left side 25L / right side 25R of the upper case 20 and the left side 42L / right side 42R of the lower case 40. However, only the upper case 20 or the lower case 40 is used. The structure which is fastened and fixed to may be sufficient.

  The arm 70 may be made of, for example, wood other than resin, and in that case, a recess corresponding to the escape portion 70a (see FIG. 5) may be cut out by a countersink process or the like.

  In the present embodiment, the wide portion 61b of the engagement protrusion 61 of the plate 60 is formed longer on the left side than the narrow portion 61a. However, the present invention is not limited to this, as shown in FIG. , It may be formed longer on both the left and right sides.

  FIG. 11 is a plan view of the rotating portion C1 showing a modification in which the shapes of the plate 60 and the engagement hole 28 are changed, and corresponds to FIG. As shown in FIG. 11, the wide portion 61 b extends long on both the left and right sides with respect to the narrow portion 61 a, and exhibits a T shape in the entire engagement protrusion 61. Correspondingly, also in the engagement hole 28 of the rear end portion 20a of the upper case 20, the wide corresponding portion 28b is formed longer on the left and right sides than the narrow corresponding portion 28a. Even with this configuration, the same effects as those of the first embodiment can be obtained.

  In addition, the inclination direction in the engagement protrusion 61 of the plate 60 is not limited to the rear, but may be the front as shown in FIG.

  12 (a) to 12 (c) are diagrams showing modifications of the rotating portion C1, and FIGS. 12 (a) to (c) are shown in FIGS. 10 (b), 9 (b) and 8 (c). Corresponding to b), the closed state of the upper case 20, the state in the middle of the rotation stroke, and the open state are shown. As shown in FIGS. 12A to 12C, in the engaging protrusion 61, the wide portion 61b is inclined obliquely forward. The plate 60 is fixed to the front surface of the back plate portion 41 of the lower case 40, but may be fixed to the rear surface or may be formed integrally with the back plate portion 41. Except for the tilt direction, the configuration of the plate 60 is the same as that in the first embodiment.

  Moreover, although the 3rd bending part 24 of the rear-end part 20a of the upper case 20 has the root part 24a, it does not have a part corresponded to the front end side half part 24b. Other configurations are the same as those in the first embodiment.

  According to the configuration of this modified example, during the opening and closing, the wide corresponding portion 28b can be inserted and removed relative to the wide portion 61b, and the “detachable angle range” is secured (FIG. 12B). )reference).

  Further, in the closed state (FIG. 12A) and the open state (see FIG. 12C) of the upper case 20, the rear end portion 20a of the upper case 20 is similar to the state shown in FIGS. The upper case 20 is not unintentionally detached from the lower case 40 in the rotating part C1 even though it can be said that the rotating part C1 is locked so as not to be displaced in the front-rear and vertical directions.

  However, in the open state (FIG. 12C), it does not have a structure that prevents rotation in the closing direction. Therefore, in order to stably maintain the upper case 20 in the open state, it is necessary to devise, for example, to engage a separate support member between the lower case 40 and the front end of the upper case 20.

  According to the modification shown in FIG. 12, the same effects as those shown in FIGS. 1 to 10 can be obtained except for the effect of releasing the upper case 20 and maintaining it stably in the open state.

  In each of the examples described above, the engagement protrusion 61 is provided in the lower case 40 and the engagement hole 28 is provided in the upper case 20. The upper case 20 and the lower case 40 may be reversed.

  Note that either or both of the keyboard part KB and the time signatures 44 and 45 may be arranged in the upper case 20 instead of the lower case 40.

  Note that the upper case 20 can be fixed to the lower case 40 while being face up, and the upper case 20 can be compared to the lower case 40 in terms of improving the appearance by making the screws 49 invisible in a natural shape. Therefore, it is not necessary to have a configuration that allows the gears to freely rotate. For example, a structure in which the upper case 20 is covered and fixed from the upper side may be used. Or you may employ | adopt other structures, such as a rotation mechanism using the rotation pin which can be inserted / removed instead of rotation part C1. Alternatively, the upper case 20 may be connected to the lower case 40 so as to be freely rotatable by a hinge or the like.

It is a top view (figure (a)) and back view (figure (b)) of an electronic keyboard musical instrument to which a case structure concerning a 1 embodiment of the present invention is applied. Right side view of the electronic keyboard instrument showing the state in the middle of assembling the upper case to the lower case (FIG. (A)), right half of the electronic keyboard instrument showing the state before the upper case is temporarily assembled and fastened to the lower case It is a perspective view (figure (b)) of a part. A plan view of the right part of the electronic keyboard instrument in a state before the upper case is temporarily assembled and the arms are assembled (FIG. (A)), a right side view of the electronic keyboard instrument in the same state (FIG. (B)), an upper case, FIG. 4 is a plan view (FIG. (C)) of the right part of the electronic keyboard instrument in a state after assembling the arms, and a right side view (FIG. (D)) of the electronic keyboard instrument in the same state. A plan view of the left part of the electronic keyboard instrument in the state before assembling the upper case and the arm (FIG. (A)), a plan view of the left part of the electronic keyboard instrument in the state after assembling the upper case and before assembling the arm It is a top view (figure (c)) of the left part of the electronic keyboard instrument in the state after attaching an upper case and a brace (figure (b)). A right side view (Fig. (A)) showing the front side of the arm tree, a left side view (Fig. (B)) showing the back side of the arm tree, and a cross-sectional view (Fig. (C)) along the AA line of Fig. (A) is there. It is a longitudinal cross-sectional view which shows the structure of one rotation part when an upper case is in an open state. The top view (FIG. (A)) of the part provided in a lower case among one rotation parts, Sectional drawing (FIG. (B)) which follows the BB line of FIG. (A), The said part provided in a lower case It is a rear view (figure (c)). It is a top view (figure (a)) of a rotation part in the open state of an upper case, and a sectional view (figure (b)) which meets a CC line of figure (a). A plan view (FIG. (A)) of the rotating part at the time of starting the assembly of the upper case or in the middle of the rotating process for opening and closing, and a sectional view taken along the line DD of FIG. (A) (FIG. (B)) It is. It is a top view (figure (a)) of the rotation part in the closed state of an upper case, and sectional drawing (figure (b)) which follows the EE line of figure (a). It is a top view of the rotation part which shows the modification which changed the shape of a plate and an engagement hole. In the modification of a rotation part, it is a figure which shows the closed state (figure (a)), upper halfway state (figure (b)), and open state (figure (c)) of an upper case.

Explanation of symbols

  10 housing, 20 upper case, 20a rear end, 28 engagement hole, 28a narrow corresponding portion, 28b wide corresponding portion, 40 lower case, 41 back plate portion (rear end portion), 60 plate, 61 engagement protrusion Contact part (projecting part), 61a Narrow part, 61b Wide part, 61x Bending position, C1 rotating part, P1, P2 Contact part

Claims (6)

Each has a housing composed of a separate lower case and upper case, and the upper case is pivotable with respect to the lower case so that the upper case can be opened and closed. The case structure of the electronic keyboard instrument that completes the case by being fixed,
A projecting portion fixedly projecting from the rear end of the lower case so as to be inclined obliquely upward and rearward from the rear end of the lower case;
And a engaging hole provided at the end after the previous SL upper case,
The upper case is rotatable in the opening / closing direction with respect to the lower case, with the projecting portion being inserted into and engaged with the engagement hole, with the engaged portion as a rotation center.
Only at a predetermined rotation angle in the middle of the rotation stroke when the upper case is opened and closed, the protruding portion is relatively inserted and removed by moving in parallel to the protruding direction of the protruding portion with respect to the engagement hole. to be able to be configured,
The rear end portion of the upper case is formed in a bowl shape in a side view, and in the closed state of the upper case, the projecting portion is a portion formed in the bowl shape of the rear end portion of the upper case. A housing structure for an electronic keyboard instrument, wherein the housing structure is not exposed to the outside .   The projecting portion includes a narrow portion and a wide portion that is longer in the key arrangement direction than the narrow portion on the tip side of the narrow portion, and the engagement hole includes the wide portion of the projecting portion. A wide corresponding portion having a width through which the portion can be inserted, and a narrow corresponding portion having a width through which the wide portion cannot be inserted and the narrow portion can be inserted, and the upper case is connected to the predetermined portion By moving the upper case relatively in the projecting direction of the projecting portion in a state corresponding to the rotation angle, the wide portion can be inserted into and removed from the wide corresponding portion, and In the open state of the upper case, due to the engagement between the wide portion and the narrow-corresponding portion, relative insertion and removal of the projecting portion with respect to the engagement hole in the projecting direction of the projecting portion is performed. 2. The casing structure of an electronic keyboard instrument according to claim 1, wherein the casing structure is configured to be blocked. Claims, characterized in that a substantially right angle with the rear end portion Oite the wide corresponding portion the width between the plate-like portion provided narrow corresponding portion is provided a plate-like portion of the front Stories upper case The housing structure of the electronic keyboard musical instrument according to 2. In the closed state before SL on cases, the said rear portion of the lower case and the engagement with the rear end portion of the upper case, the side surfaces being tilted out of the front and rear of the projecting portion and The engagement with the engagement hole is configured to prevent relative insertion and removal of the protrusion in the protrusion direction of the protrusion with respect to the engagement hole by cooperation of both engagements. The housing structure of an electronic keyboard instrument according to claim 2 or 3, In the open state of the front SL upper case, and engagement between the narrow corresponding portion of the engaging hole and the narrow portion of the projecting portion, the said lower case and said rear end portion of the upper case 5. The upper case is configured to be maintained in the open state by cooperation of both engagements of direct or indirect engagement with a rear surface of a rear end portion. The housing structure of the electronic keyboard musical instrument of any one of these.   6. The casing structure of an electronic keyboard instrument according to claim 1, wherein a plurality of sets of the projecting portion and the engagement hole are provided in the key arrangement direction.

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