JP2017173438A - Pin assembly for instrument housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for more facilitating position adjustment of a pin for positioning a lid and a body in an instrument housing.SOLUTION: A pin assembly 7 used for positioning a lid and a body of an instrument housing comprises: a pin 10 which has a trunk 11 inserted into a pin insertion hole provided on the body; a fixing member 40 fixed to the lid; and a movable member 50 which can move along a plate face of the lid. In the pin assembly 7, a part of the movable member 50 is arranged between the fixing member 40 and the lid. The pin assembly 7 is configured so that, when the pin 10 is attached to the movable member 50, a load in a direction from the lid to the fixing member 40 is applied to the movable member 50.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pin assembly used for positioning a lid and a main body in a housing of a musical instrument.

  Generally, the large roof and the main body of the grand piano are attached using a hinge on the low sound side so that the large roof can be opened and closed. In addition, transportation of the grand piano and the like is performed in a state where the main body of the grand piano is set up with the bass side down. At this time, the load of the entire large roof was applied to the hinge, and the hinge could be damaged during transportation. In order to suppress such damage to the hinge, a member provided with a pin insertion hole is attached to the side plate constituting the main body, and the pin member provided with the pin inserted into the pin insertion hole is attached to the large roof using a screw. The load applied to the hinges is reduced by attaching them to the hinges.

JP2013-250402A

  However, the side plates constituting the main body may be deformed due to changes over time or changes in temperature and humidity. If the side plate is deformed, the pin provided on the pin member may not be inserted into the pin insertion hole. If it becomes impossible to insert the pin into the pin insertion hole, the large roof cannot be completely closed. Therefore, it is required to remove the pin member. In addition, when transportation or the like is performed in a state where the pin provided on the pin member can no longer be inserted into the pin insertion hole, it is required to reattach the pin member. In this way, if the pin member is removed or reattached, unnecessary screw holes remain in the large roof, and the aesthetic appearance of the large roof itself is impaired. Therefore, the screw holes are filled to maintain the aesthetic appearance of the large roof. May be required. Further, when the pin member is reattached, an operation such as formation of a pilot hole at an appropriate position is required, and it is not always easy to reattach the pin member. These problems are common to musical instruments having a housing structure such as a harpsichord or a forte piano in addition to a grand piano, but no means for solving them has been known yet.

  In addition, as a method of preventing the hinge used in the keyboard instrument from being damaged by a load, the angle adjuster of the music stand has a thickness of a folded hinge that is folded, and a pair of thicknesses arranged in parallel. And an intermediate portion that is disposed between these thick portions and is recessed with respect to the upper surface perpendicular to the thickness direction of these thick portions, and hooks one end of a support bar that supports the music stand on the intermediate portion. It has been proposed that a plurality of hooking portions that can be arranged side by side along the longitudinal direction of the thick portion (Patent Document 1). However, the above problem cannot be solved by the method disclosed in Patent Document 1.

  The present invention has been made to solve the above-described conventional problems, and in a musical instrument having a casing structure, it is easier to adjust the position of a pin for positioning the casing lid and the main body. The purpose is to provide technology.

  In order to achieve at least a part of the above problems, a pin assembly of the present invention is a pin assembly for positioning a lid of a musical instrument housing and a main body, and includes a pin insertion hole provided in the main body. A pin having a body portion inserted into the lid, a fixed member fixed to the lid, and a movable member movable along the plate surface of the lid, wherein a part of the movable member includes the fixed member The pin assembly is arranged between the lid and the pin assembly so that a load in a direction from the lid toward the fixed member is applied to the movable member by attaching the pin to the movable member. It is characterized by being.

  In this configuration, the fixing member is fixed to the lid, and a part of the movable member movable along the plate surface of the lid is arranged between the fixing member and the lid. In this configuration, by attaching the pin to the movable member, a load in a direction from the lid toward the fixed member is applied to the movable member. Therefore, by attaching the pin to the movable member, a part of the movable member positioned between the fixed member and the lid is pressed against the fixed member, and a drag is generated at a contact portion between the part of the movable member and the fixed member. . The generated drag force generates a frictional force against the force that moves the movable member along the plate surface of the lid at the contact portion between the movable member and the fixed member. The pin is fixed to the lid. On the other hand, when the pin is not attached to the movable member, the movable member to which the pin is attached is movable along the plate surface of the lid, so that the position of the pin can be adjusted. Therefore, after adjusting the position of the pin, by attaching the pin to the movable member, the pin can be moved as necessary, so that the body provided on the pin can be reliably inserted into the pin insertion hole. It becomes easier to adjust the position of the pin.

  The pin has a pin attachment mechanism for attaching the pin to the movable member, and the pin attachment mechanism is provided at an end portion of the trunk portion on the movable member side, and the pin is attached to the pin. It is good also as what has the attachment operation part for performing operation which attaches to a movable member. Generally, in a musical instrument casing, a gap is formed between a lid and a main body. Therefore, in the pin attachment mechanism for attaching the pin to the movable member, the lid is closed by providing an attachment operation portion for performing an operation of attaching the pin to the movable member at the end of the trunk portion on the movable member side. The pin can be fixed to the lid in a state where the pin is inserted into the pin insertion hole. For this reason, it is possible to omit adjusting the position of the pin in a state where the lid is opened, so that it becomes easier to adjust the position of the pin so that the body portion can be reliably inserted into the pin insertion hole.

  The pin has a pin attachment mechanism for attaching the pin to the movable member, and the pin attachment mechanism is provided at an end portion of the trunk portion on the movable member side, and the pin is attached to the pin. It is good also as what has the tool action part on which the attachment tool for attaching to a movable member acts. Also in this configuration, since the tool action part on which the attachment tool for attaching the pin to the movable member acts is provided at the end of the trunk part on the movable member side, the lid is closed and the trunk part is inserted into the pin insertion hole. In this state, the pin can be fixed to the lid. Therefore, it becomes easier to adjust the position of the pin so that the body portion can be reliably inserted into the pin insertion hole.

  The pin assembly further includes a cover that is disposed between the body portion and the fixed member and configured to cover the movable member and the fixed member within a range in which the movable member can move. It is good as a thing. By placing a cover configured to cover the movable member and the fixed member within a range in which the movable member can move between the trunk and the fixed member, the fixed member is sandwiched between the cover and the movable member and is movable. The member can be fixed with respect to the fixing member. Further, since the cover is configured to cover the movable member and the fixed member within a range in which the movable member can move, the contact area between the cover and the fixed member can be increased. For this reason, even when a load is applied to the pin, for example, when the pin is fixed to the lid, the pin can be prevented from moving. Moreover, since the movable member and the fixed member are covered by the cover, it is possible to suppress a decrease in aesthetics due to the exposure of the fixed member and the movable member.

  The pin assembly further includes a drop prevention member that is disposed between the movable member and the lid, and is fixed to an end portion of the pin on the lid side when the pin assembly is assembled. It is also good. By providing the drop-off prevention member, it is possible to prevent the pin from falling into the main body when the pin is not attached. For this reason, it is possible to reduce the possibility of the function of the action mechanism and the resonance mechanism assembled to the main body being hindered by the dropped pin.

  The movable member may be formed such that the distance between the outer edge of the movable member and the center of the movable member is unequal in the circumferential direction. By making the distance between the outer edge and the center of the movable member unequal in the circumferential direction, a portion where the distance between the outer edge and the center is longer in the movable member, and a portion where the fixing member is fixed to the lid Can be controlled to regulate the rotation of the movable member. Therefore, when the pin and the movable member are configured to be attached by rotating the pin with respect to the movable member, the movable member rotates with the rotation of the pin when the pin is attached to the movable member. Therefore, the pin can be attached to the movable member more easily.

  Note that the present invention can be realized in various modes. For example, a pin assembly for positioning the lid of the musical instrument housing and the main body, a musical instrument housing using the pin assembly, a musical instrument having the musical instrument housing, and the lid and the main body are positioned by the pin assembly It can be realized in a manner such as a transport method for transporting a musical instrument casing or a musical instrument in a state of being used, or a dedicated tool for attaching a pin to a movable member in the pin assembly.

The perspective view which shows the whole structure of the grand piano in 1st Embodiment of this invention. The disassembled perspective view which shows the structure of the pin assembly in 1st Embodiment. Explanatory drawing which shows a mode that a movable member moves with respect to a fixed member in the state which fixed the fixed member to the large roof with the set screw. The disassembled perspective view which shows the structure of the pin assembly in 2nd Embodiment. The disassembled perspective view which shows the structure of the pin assembly in 3rd Embodiment. Explanatory drawing which shows the modification of a fixed member and a movable member.

A1. The overall structure of the grand piano:
FIG. 1 is a perspective view showing the overall configuration of the grand piano GP in the first embodiment of the present invention. FIG. 1A shows the entire grand piano GP in a use state such as performance, and FIGS. 1B and 1C are respectively a region A and a region A surrounded by a dotted line in FIG. Region B is shown enlarged. The grand piano GP has a main body 1 assembled with an action mechanism, a resonance mechanism, and the like, and a large roof 2 configured to cover the upper end of the main body 1. In other words, the grand piano GP has a structure in which an action mechanism, a resonance mechanism, and the like are assembled to a casing (instrument casing) including a main body 1 and a large roof 2 (lid). The large roof 2 is attached to a side plate 3 constituting the main body 1 by two hinges 4 and 5 on the low sound side. By attaching the large roof 2 and the side plate 3 using the hinges 4 and 5 as described above, the large roof 2 can be opened so as to lift the treble side upward as shown in FIG. ing. Since the action mechanism and the resonance mechanism assembled to the main body 1, the support mechanism for the large roof 2 such as a protruding rod, or other configurations of the grand piano GP such as the legs supporting the main body are not directly related to the present invention. The description is omitted here.

  As shown in FIG. 1, in the grand piano GP of the first embodiment, a pin assembly 7 having a pin 10 extending to the main body 1 side is provided on the main body 1 side surface (lower surface) of the large roof 2. . Further, a pin receiving member 8 is provided at the upper end portion of the side plate 3 at a position facing the pin assembly 7 when the large roof 2 is closed. The pin receiving member 8 is provided with a pin insertion hole 9 into which the pin 10 is inserted when the large roof 2 is closed. In this way, when the pin 10 is inserted into the pin insertion hole 9 and the pin 10 is fitted into the pin insertion hole 9, the large roof 2 and the main body 1 have a pin insertion hole in addition to the two hinges 4 and 5. It is fixed (positioned) by the pin 10 fitted in the pin 9. As a result, even when the main body 1 is set up with the bass side of the grand piano GP down as in transportation, the load applied to the hinges 4 and 5 is reduced. It becomes possible to suppress damage.

A2. Pin assembly configuration:
FIG. 2 is an exploded perspective view showing the configuration of the pin assembly 7 in the first embodiment. In FIG. 2, for convenience of illustration, a partial cross section of some members is shown. Although not shown in FIG. 2, in FIG. 2, the lower surface (plate surface) of the large roof 2 (FIG. 1) is located on the lower side of the drawing in a state orthogonal to the alternate long and short dash line drawn in FIG. Therefore, in the following, the lower side of the drawing in FIG. 2 is the tip side when the pin 10 is inserted into the pin insertion hole 9, and hereinafter, the upper side of the drawing in FIG.

  As shown in FIG. 2, the pin assembly 7 includes a pin 10, a cover 20, three set screws 30, a fixing member 40, a movable member 50, and three spacers 60. These members 10, 20, 30, 40, 50, 60 are preferably formed of a metal such as brass or stainless steel in order to sufficiently increase the strength of the pin assembly 7. In particular, the set screw 30, the fixing member 40, the movable member 50, and the spacer 60 are more preferably formed of a highly rigid metal such as stainless steel in order to increase the strength of the pin assembly 7.

  The pin 10 extends from the plate side to the front side, and is provided with a cylindrical body portion 11 inserted into the pin insertion hole 9 (FIG. 1) and a front surface side of the body portion 11, and has a curved surface shape convex toward the front side. It has the front-end | tip part 12 and the external thread part 13 which extended in the board side from the board | plate side edge of the trunk | drum 11 and in which the screw | thread was formed in the outer peripheral surface. A cross-shaped tool hole 19 for rotating the pin 10 is provided at the front end portion of the distal end portion 12. In addition, in the example of FIG. 2, the trunk | drum 11 is made into the column shape, However, The shape of a trunk | drum can be changed variously. For example, it is good also as a taper shape from which an outer diameter reduces at least one part of a trunk | drum toward the front side. In this case, the front end portion 12 may be omitted, and a tool hole may be provided on the end surface on the front side of the body portion 11. As will be described later, the length of the male screw portion 13 is determined when the male screw portion 13 is screwed into the female screw portion 51 of the movable member 50 and the pin 10 and the movable member 50 are fixed to the plate surface (when the pin is fixed). ) Is set so that the external thread 13 does not protrude from the end of the female thread 51 on the plate side.

  The cover 20 includes a disk portion 21 located on the front side, and a cylindrical tubular portion 22 extending from the peripheral portion of the disk portion 21 to the plate side. In the center of the disk portion 21, a through hole 29 having an inner diameter larger than the outer diameter of the male screw portion 13 of the pin 10 and through which the male screw portion 13 passes is provided. The length of the cylindrical portion 22 is set so that the cylindrical portion 22 does not contact the plate surface when the pin is fixed. The outer diameter of the cover 20 is preferably set so as to cover the fixed member 40 and the movable member 50 within a range in which the movable member 50 is movable. In this way, even when the movable member 50 is moved, the contact area between the disk portion 21 and the fixed member 40 can be increased. Therefore, when the grand piano GP (FIG. 1) is transported or the like, even when a load is applied to the large roof 2 and a load is applied to the pin 10 fixed to the large roof 2, it is more certain that the pin 10 moves. Can be suppressed. Further, by covering the fixed member 40 and the movable member 50 with the cover 20, the set screw 30, the fixed member 40, and the movable member 50 are not exposed, and it is possible to suppress a decrease in aesthetics due to the provision of the pin assembly 7. it can. Although the cylindrical portion 22 can be omitted, the cylindrical portion 22 is provided in that the fixed member 40, the movable member 50, and the spacer 60 are not exposed, and the deterioration of aesthetics can be suppressed. Is preferred.

  The set screw 30 is a wood screw having a cylindrical portion 31 and a head portion 32 having a countersunk shape (that is, a shape having a frustoconical seat surface and a flat screw upper surface). In addition, the shape of the head can be changed to various shapes such as a pan shape and a flat shape in addition to the dish shape. Moreover, it is also possible to use a screw that meshes with a female screw instead of the wood screw. In this case, a female screw is driven into the lower surface of the large roof 2 (FIG. 1), and since it is driven, a set screw may be engaged with the screw.

  The fixing member 40 is an annular member provided with an opening 49 in the center, and has three screw holes 47 and counterbore 48 formed coaxially, and is equiangular with the central axis of the fixing member 40 as an axis. In the position. In the following, in such a specific member, an equiangular position with the central axis as an axis is also simply referred to as an “equal angular position”. The screw hole 47 passes through the cylindrical portion 31 of the set screw 30, and the counterbore 48 accommodates the head portion 32 of the set screw 30.

  Since the movable member 50 is cylindrical and has a female thread formed on the inner peripheral surface 59, it is outward from the threaded portion 51 and the end of the female threaded portion 51 at the equiangular position (that is, the central portion of the movable member 50). It has three plate-like outer extension parts 52 extended in the direction. The distance from the front end face of the extension part 52 to the front end face of the female thread part 51 (the length of the protruding part of the female thread part 51) is determined by screwing the male thread part 13 of the pin 10 into the female thread part 51. Is set so that the front end surface of the female screw portion 51 does not come into contact with the plate side end surface of the disk portion 21 of the cover 20. Therefore, the length of the protruding portion of the female screw portion 51 may be zero, that is, the female screw portion 51 may not protrude from the front end surface of the outer extension portion 52. However, in order to increase the tightening strength between the external thread portion 13 and the internal thread portion 51, it is preferable to make the internal thread portion 51 longer. Therefore, the length of the protruding portion of the female screw portion 51 is preferably set to be slightly shorter than the thickness of the fixing member 40. Moreover, in order to suppress the interference with the extension part 52 and the spacer 60, the width of the extension part 52 is preferably set to be equal to or smaller than the outer diameter of the female thread part 51 as shown in FIG. In addition, when the internal thread part 51 does not protrude from the front side end surface of the external extension part 52, it is difficult to distinguish the internal thread part 51 and the external extension part 52. Therefore, in this case, it is appropriate to regard both the female screw portion 51 and the outer extension portion 52 as the movable member 50 as a whole for the part that distinguishes the female screw portion 51 and the outer extension portion 52 in the following description. It is.

  The spacer 60 is a cylindrical member provided with a through hole 69 through which the cylindrical portion 31 of the set screw 30 passes. The thickness of the spacer 60 is larger than the thickness of the extended portion 52 so that the movable member 50 can move relative to the large roof 2 even when the fixed member 40 is fixed to the large roof 2 (FIG. 1). . Instead of the spacer 60, a protrusion may be provided on the plate side of the fixing member. In this case, the protrusion may be disposed at a position corresponding to the screw hole, and a through hole in which the screw hole is extended to the plate side may be provided in the protrusion. In this way, positioning of the spacer is not necessary, and the assembly of the pin assembly becomes easier. On the other hand, it is preferable that the movable member 50 is movable with respect to the large roof 2 by the spacer 60 in that the manufacture of the fixed member becomes easier.

  When the pin assembly 7 is assembled, first, the movable member 50, the spacer 60, and the fixed member 40 are arranged in this order on the plate surface (the lower surface of the large roof 2 (FIG. 1)). Thereby, the extension part 52 which is a part of the movable member 50 is disposed between the fixed member 40 and the large roof 2. Next, as shown by a two-dot chain line, the set screw 30 is inserted from the front side to the plate side through the screw hole 47 of the fixing member 40 and the through hole 69 of the spacer 60, and the fixing member 40 is enlarged by the set screw 30. Secure to the roof 2. After fixing the fixing member 40 to the large roof 2, the cover 20 is disposed on the front side of the fixing member 40.

  After disposing the cover 20 on the front side of the fixed member 40, the male screw portion 13 of the pin 10 is screwed into the female screw portion 51 of the movable member 50 through the through-hole 29 of the cover 20, as shown by a one-dot chain line. 10 and the movable member 50 are tightened. Thereby, a load in a direction from the front side toward the fixed member 40 is applied to the cover 20, and a load in a direction from the plate side (large roof 2) to the fixed member 40 is applied to the movable member 50. When the load in the direction toward the fixed member 40 is applied to the cover 20 and the movable member 50, the plate-side end surface of the disk portion 21 included in the cover 20 is pressed against the front-side end surface of the fixed member 40, and the movable member 50 has. The front end surface of the extended portion 52 is pressed against the plate side end surface of the fixing member 40. In this way, a drag force is generated at the contact portions pressed against each other, and this drag force generates a frictional force that opposes the force that moves the movable member 50 along the plate surface. Therefore, the cover 20, the movable member 50, and the pin 10 Is fixed to the large roof 2. When the position of the pin 10 with respect to the large roof 2 is changed, the pin 10 and the movable member 50 may be loosened, the position of the pin 10 may be changed, and then the pin 10 and the movable member 50 may be tightened again. The state where the pin 10 and the movable member 50 are loosened is not a state where the pin 10 is completely attached to the movable member 50, so that the state where the pin 10 is not attached to the movable member 50 is so-called. Can do. On the other hand, the state in which the pin 10 and the movable member 50 are tightened is a state in which the pin 10 is completely attached to the movable member 50. Therefore, this state is called a state in which the pin 10 is attached to the movable member 50. Can do.

  In the first embodiment, the pin 10 is attached to the movable member 50 by providing the pin 10 with the screw portion 13 and screwing the male screw portion 13 into the female screw portion 51. Further, a tool hole 19 is provided on the front side of the pin 10 in order to perform an operation of rotating the pin 10 in order to attach the pin 10 to the movable member 50. As described above, since both the male screw portion 13 and the tool hole 19 provided on the pin 10 are used for attaching the pin 10 to the movable member 50, it can also be called a pin attachment mechanism. Further, when the pin 10 is attached to the movable member 50, an operation (attachment operation) of rotating the pin 10 by applying a tool (attachment tool) to the tool hole 19 is performed. Therefore, the tool hole 19 can be referred to as a tool action portion on which the attachment tool acts, and can also be referred to as an attachment operation portion that performs an attachment operation.

  In the pin assembly 7 of the first embodiment, the movable member 50 is movable with respect to the fixed member 40 fixed to the large roof 2 (FIG. 1). Is in contact with the spacer 60, so that rotation about the center of the female thread portion 51 of the movable member 50 is regulated. For this reason, the rotation of the movable member 50 with the rotation of the pin 10 is suppressed without providing a separate means for suppressing the rotation of the movable member 50. Therefore, the pin 10 and the movable member 50 can be more easily operated. And can be tightened. Further, since a separate means for suppressing the rotation of the movable member 50 can be omitted as described above, even when the movable member is covered with the cover 20 as shown in FIG. 10 and the movable member 50 can be tightened. In order to restrict the rotation of the movable member, it is not necessary to divide the extension portion 52 into three as in the first embodiment, and the distance between the outer edge and the center of the extension portion is not equal in the circumferential direction. Just do it.

A3. Movement of movable member:
FIG. 3 is an explanatory diagram showing a state in which the movable member 50 moves relative to the fixed member 40 and the large roof 2 in a state where the fixed member 40 is fixed to the large roof 2 (FIG. 1) by the set screw 30. As described above, since the thickness of the spacer 60 is larger than the thickness of the outer extension portion 52, the movable member 50 is a plate surface (the lower surface of the large roof 2) even when the fixed member 40 is fixed to the large roof 2. It can move along. Therefore, the pin 10 fixed to the movable member 50 can be moved along the lower surface of the large roof 2, similarly to the movable member 50. Further, as shown in FIGS. 3A to 3C, in the pin assembly 7 of the first embodiment, the width of the outer extension portion 52 is made sufficiently narrow (less than the outer diameter of the female screw portion 51). Therefore, the outer peripheral surface of the internal thread portion 51 of the movable member 50 and the inner peripheral surface of the opening portion 49 provided in the fixed member 40 without interference between the outer extension portion 52 and the spacer 60 (FIG. 2). The movable member 50 can be moved to a position where the two come into contact with each other. Therefore, it is possible to make the moving amount of the movable member 50 and the pin 10 sufficiently large without excessively increasing the size of the pin assembly 7.

  By the way, there is a possibility that the side plate 3 constituting the main body 1 of the grand piano GP may be deformed due to a change over time or a change in temperature or humidity. When the present invention is not applied and the pin member on which the pin is formed is directly fixed to the large roof, if the side plate 3 is deformed, the pin provided on the pin member may not be inserted into the pin insertion hole 9. is there. If it becomes impossible to insert a pin into the pin insertion hole 9, the large roof 2 cannot be completely closed. Therefore, it is required to remove the pin member. Further, when the grand piano GP is transported in a state where the pins cannot be inserted into the pin insertion holes 9, it is required to reattach the pin members. When the pin member is removed or reattached in this way, unnecessary screw holes remain in the large roof 2 and the aesthetic appearance of the large roof 2 itself is impaired. May need to be filled. Furthermore, when the pin member is reinstalled, an operation such as formation of a pilot hole at an appropriate position is required, and it is not always easy to reinstall the pin member.

  On the other hand, according to the first embodiment, the pin 10 can be moved along the lower surface of the large roof 2 by loosening the tightening of the pin 10 and the movable member 50. Then, after changing the position of the pin 10, the pin 10 is fixed to the large roof 2 by retightening the pin 10 and the movable member 50. Therefore, even when the side plate 3 is deformed, the pin 10 can enter the pin insertion hole 9 only by the simple operation described above. Moreover, according to 1st Embodiment, since the pin 10 can be moved along the lower surface of the large roof 2 without removing the fixing member 40, it is suppressed that an unnecessary screw hole is formed in the large roof 2. can do.

B. Second embodiment:
FIG. 4 is an exploded perspective view showing the configuration of the pin assembly 7a in the second embodiment. The pin assembly 7a of the second embodiment is different from the first embodiment in that the shape of the pin 10a is changed. Other points are the same as in the first embodiment. Specifically, in the pin 10a in the second embodiment, the plate-side end portion (that is, the end portion on the movable member 50 side) of the body portion 11a is cut out, and two parallel flat portions 14a are provided.

  In general, in the grand piano GP, a gap is formed between the large roof 2 and the side plate 3 even when the large roof 2 is closed. And in the pin assembly 7a of 2nd Embodiment, since the two flat parts 14a of the pin 10a are provided in the board side edge part of the trunk | drum 11a, in the state which closed the large roof 2, The pin 10a can be rotated by inserting a spanner-like tool (rotating tool) that meshes with the two flat portions 14a from the gap between the side plate 3 and the side plate 3. When the large roof 2 is closed, the pin 10a is inserted into the pin insertion hole 9 of the pin receiving member 8 provided on the side plate 3, so that the position of the pin 10a is not adjusted separately. The pin 10a can be adjusted to a position where the pin 10a can be fitted into the pin insertion hole 9 more easily.

  In the example of FIG. 4, two flat portions 14 a are provided so that the flat portions 14 a mesh with a spanner-like rotary tool. However, in general, the end of the barrel on the movable member side rotates. What is necessary is just to be formed so that it may mesh with a tool. For example, an even number of four or more flat portions may be provided at the end of the barrel portion on the movable member side, and a spanner-shaped rotary tool may be engaged with two of the flat portions. A hole penetrating the body portion in the radial direction may be provided at the end on the side, and a rod-shaped rotary tool may be engaged with the hole. These flat portions and holes can also be called tool operation portions or mounting operation portions, like the tool holes 19 (FIG. 2) in the first embodiment, and these flat portions and holes and male screw portions. 13 can also be called a pin mounting mechanism.

C. Third embodiment:
FIG. 5 is an exploded perspective view showing the configuration of the pin assembly 7b in the third embodiment. In the pin assembly 7b of the third embodiment, in order to prevent the pin 10b from falling off, a dropout preventing member 70b is added, the shape of the pin 10b is changed, the addition of the dropout preventing member 70b, and the pin 10b The second embodiment is different from the first embodiment in that the shapes of the cover 20b, the set screw 30b, and the spacer 60b are changed according to the shape change. Other points are the same as in the first embodiment.

  The pin 10b has a fitting portion 15b having an outer diameter smaller than that of the male screw portion 13 and a fitting portion 15b having an outer diameter smaller than that of the male screw portion 13 from the plate-side end surface of the male screw portion 13 toward the plate side. The larger hook-shaped part 16b is provided in this order. The lengths of the male screw portion 13 and the fitting portion 15b are set such that at least the fitting portion 15b protrudes from the plate-side end of the female screw portion 51 when the pin is fixed.

  The drop-off prevention member 70b disposed on the plate side with respect to the movable member 50 includes an annular annular portion 71b provided with an opening 79b, and three inwardly extending portions 72b extending inwardly from the opening 79b at an equiangular position. And have. The inward extending portion 72b extends obliquely toward the front side (that is, the movable member 50 side) than the annular portion 71b. The inwardly extending portion 72b has a diameter of a circle inscribed in the three inwardly extending portions 72b that is larger than the outer diameter of the fitting portion 15b and smaller than the outer diameter of the flange-shaped portion 16b. Note that the drop-off preventing member 70b only needs to be able to prevent the pin 10b from dropping off, and can be formed of resin in addition to metal.

  As described above, the cover 10b and the set screw 30 are respectively provided with the cylindrical portion 22b and the cylindrical portion 31b along with the provision of the fitting portion 15b and the flange-shaped portion 16b on the pin 10b and the addition of the drop-off preventing member 70b. The spacer 60b has a large thickness.

  When the male screw portion 13 is screwed into the female screw portion 51 of the movable member 50 when assembling the pin assembly 7b, the hook-like portion 16b protrudes from the end of the female screw portion 51 on the plate side, It strikes against the extension 72b. When the external thread portion 13 is further screwed into the female thread portion 51 from this state, the inner extension portion 72b of the drop-off prevention member 70b is elastically deformed and exceeds the flange-shaped portion 16b, and then the distal end of the inner extension portion 72b is fitted. Fit into the part 15b. When the tip of the inward extending portion 72b is fitted into the insertion portion 15b, the inward extending portion 72b is hooked on the hook-shaped portion 16b, whereby the pin 10b and the drop-off preventing member 70b are fixed on the plate side of the pin 10b. Then, since the movement of the pin 10b toward the front side is restricted when the drop-off preventing member 70b comes into contact with the movable member 50, the pin 10b is dropped from the pin assembly 7b while the pin 10b remains in a rotatable state. Is suppressed.

  As described above, in the third embodiment, the pin 10b is prevented from falling off, so that when the pin 10b and the movable member 50 are loosened to move the pin 10b, the pin 10b falls off and the grand piano is removed. Entering the inside of the main body 1 of the GP is suppressed. For this reason, it is possible to reduce the possibility of the function of the action mechanism and the resonance mechanism assembled to the main body 1 being hindered by the dropped pin 10b.

  In general, the drop-off prevention member only needs to be provided on the plate side of the movable member, that is, between the movable member and the large roof 2 (FIG. 1). The shape of the pin and the drop-off prevention member Various changes can be made. For example, the drop-off prevention member can have a structure (snap-fit structure) in which a hook that fits into the fitting portion 15b is formed on a disk-shaped member arranged on the plate side. In addition, an insertion hole whose inner diameter increases toward the front side at least in part from the plate-side end surface of the male thread portion of the pin is provided, and the disk-shaped member disposed on the plate side is provided with the insertion hole. It is also possible to adopt a structure in which a pin having a large diameter part to be fitted is erected (press fit structure). Furthermore, the male screw portion may be extended to the plate side, and the internal extension portion of the drop-off preventing member may be hung on the male screw itself provided on the male screw portion.

D. Modified examples of the fixed member and the movable member:
FIG. 6 is an explanatory view showing a modification of the fixed member and the movable member. In each of the above embodiments, the pin is formed by using the annular fixing member 40 provided with the three screw holes 47 at the equiangular position and the movable member 50 having the three extending portions 52 extending outward from the equiangular position. Although the assemblies 7, 7a, and 7b are configured, the shapes of the fixed member and the movable member can be variously changed.

  In the first modification example of the fixed member and the movable member shown in FIG. 6A, the movable member 50c having the four outer extending portions 52c extending from the equiangular position and the four screw holes 47c at the equiangular position are provided. An annular fixing member 40c is used. Even in this way, the internal thread 51 of the movable member 50c can move inside the opening 49 of the fixed member 40c. In the first modification, the contact area between the outer extension portion 52c of the movable member 50c and the fixed member 40c increases, so that the movement of the pin when a load is applied is suppressed, compared to the above embodiments. preferable. On the other hand, in the first modification, the movable range of the female screw portion 51 is limited by the interference between the outer extension portion 52 c and the spacer 60. In this respect, each of the above embodiments is more preferable than the first modification.

  The second modification shown in FIG. 6B is the first modification except that a square plate-like member is provided with a square opening 49d and a fixing member 40d provided with screw holes 47d at four corners. Same as example. In the second modification, the movement of the pin 10 when the contact area between the outer extension portion 52c of the movable member 50c and the fixed member 40d increases and a load is applied is suppressed, and the extension portion 52c and the spacer 60 are not moved. The movable range of the female screw portion 51 is not limited by interference, and the movable range of the female screw portion 51 can be made wider, which is preferable to the above embodiments and the first modification. However, in the second modified example, if the movable range in the side direction of the fixing member 40d is made equal to the above-described embodiments and the first modified example, the length of the fixing member 40d in the diagonal direction becomes longer. The pin assembly becomes larger. In this respect, the above-described embodiments and the first modification are more preferable than the second modification.

  In the third modified example shown in FIG. 6C, the outwardly extending portion 52e of the movable member 50e has an annular shape. And in order to avoid interference with the extension part 52e and the spacer 60, while increasing the outer diameter of the fixing member 40e, the screw hole 47e is arrange | positioned in the outer peripheral part vicinity of the fixing member 40e. Even in this way, the internal thread 51 of the movable member 50e can move inside the opening 49e of the fixed member 40e. The third modified example is more preferable than the above-described embodiments and the first and second modified examples in that the shape of the outer extending portion 52e is a simple annular shape and the manufacture of the movable member 50e is easier. On the other hand, in the third modified example, the rotation of the movable member 50e is not restricted, and it is not always easy to fasten the pin and the movable member 50e, and the movable range is described in each of the above embodiments, the first and second embodiments. If it is equivalent to the modified example, the fixing member 40e and the pin assembly are enlarged. In these respects, the above-described embodiments, the first and second modifications are more preferable than the third modification.

  In each of the above-described embodiments and modifications, the shape of the fixing members 40, 40c, 40d, and 40e is an annular member provided with openings 49, 49d, and 49e at the center. It does not have to be annular. Generally, the fixed member should just be comprised so that a part of movable member may be located between a fixed member and the big roof 2 (FIG. 1). For example, a plurality of fan-shaped members obtained by dividing the annular fixing members 40, 40c, and 40e can be used as the fixing members. Even in this case, the pin and the movable member are fastened and the load is applied to the movable member and the cover in the direction toward the stationary member by attaching the pin to the movable member. Can generate drag. And since this drag force generates a frictional force that opposes the force that moves the movable member along the plate surface, the movable member and the pin attached to the movable member can be fixed to the large roof 2.

E. Variations:
The present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

E1. Modification 1:
In each of the above-described embodiments, the pin 10, 10a, 10b is provided with the threaded portion 13, the movable member 50 is provided with the female threaded portion 51, and the male threaded portion 13 is screwed into the female threaded portion 51 to pin the pins 10, 10a, 10b. Although the movable member 50 is tightened, the pin and the movable member can be tightened by different means. For example, it is possible to provide a female screw at the plate-side end of the pin, and provide a screw at the front-side end of the fixing member, and tighten the pin and the movable member using these female and male screws. Alternatively, a plurality of claws may be provided on each of the pin and the movable member, and the pin and the movable member may be engaged with each other by rotating the pin with respect to the movable member to tighten the pin and the movable member.

  Further, the pin and the movable member can be tightened without rotating the pin itself. For example, the pin and the movable member may be tightened using a screw provided separately from at least one of the pin and the movable member. Moreover, it replaces with the external thread part 13 fixed to the pins 10, 10a, 10b, and provides the external thread part which can rotate with respect to a pin, The said external thread part is rotated with respect to a pin by operation from the side of a pin. It is also possible to make it. For example, by providing a rotation direction conversion mechanism such as a bevel gear between the front side of the male screw part and a rotatable operation member (attachment operation part) arranged on the side of the pin, and rotating the operation member The male screw part may be rotated with respect to the pin. Further, a member for tightening the pin and the movable member may be moved to the front side by operating an operation member disposed on the side of the pin using a mechanism such as a pantograph structure. Even if it does in this way, since a fixed member is pinched | interposed by the cover provided in the board side rather than the trunk | drum and the extending part of a movable member by pinching a pin and a movable member, a pin is fixed to the large roof 2. It can fix to the fixed member made. However, it is preferable that the pin and the movable member are tightened by rotating the pin itself in that the configuration of the pin assembly can be simplified. In addition, when providing the operation member (attachment operation part) which clamps a pin and a movable member in the side of a pin, it is preferable to provide an operation member in the edge part by the side of the movable member of a trunk | drum similarly to 2nd Embodiment. .

E2. Modification 2:
In each of the above embodiments, the disk part 21 of the covers 20 and 20b provided between the body part and the fixing member 40 and the outer extension part 52 of the movable member 50 are pressed against the fixing member 40, and the pins 10 and 10a are pressed. , 10b is fixed to the fixed member 40 fixed to the large roof 2, the fixed member 40 is sandwiched between the disk portion 21 and the extended portion 52, but in general, by attaching a pin to the movable member It is sufficient that a load from the large roof 2 toward the fixed member is applied to the movable member. For example, the covers 20 and 20b are omitted and the length of the male thread portion of the pin is adjusted so that the male thread portion of the pin protrudes from the plate-side end surface of the female thread portion 51 of the movable member 50 when the pin is fixed. The outer extension 52 of the member 50 may be pressed against the fixing member 40. Even if it does in this way, the frictional force which opposes the force which moves the pin and the movable member 50 along the large roof 2 arises by the drag force which generate | occur | produces in the contact part of the outer extension part 52 and the fixed member 40 of the movable member 50. The pin and the movable member 50 can be fixed to the large roof 2. However, in this case, since the movable member 50 and the fixed member 40 are exposed, there is a possibility that the aesthetics may deteriorate. In this regard, the pin assembly is preferably configured as in the above embodiments.

E3. Modification 3:
In the first and second embodiments, the movable member 50 is arranged directly on the plate surface of the large roof 2. However, the plate-side end surface of the movable member 50 has high flexibility such as felt or rubber and is movable. It is also possible to attach a flexible member formed in accordance with the shape of the plate-side end surface of the member 50. If it does in this way, it will be suppressed that damage to the board surface of large roof 2 with the movement of movable member 50 occurs. Further, in the case where the extended portion 52e has an annular shape as in the third modified example of the fixed member and the movable member, friction is generated between the flexible member and the plate surface of the large roof 2, and the movable member 50e. Therefore, the rotation of the movable member 50e with the rotation of the pin can be suppressed, and the pin and the movable member 50e can be clamped more easily.

E4. Modification 4:
In each of the above-described embodiments, the present invention is applied to the grand piano GP. However, in the present invention, in addition to the grand piano GP, a sound generation mechanism such as an action mechanism such as a harpsichord, a Clavi chord or a forte piano is provided in a housing (instrument housing). It can also be applied to various musical instruments having a housing structure assembled to the body.

  DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Large roof, 3 ... Side plate, 4, 5 ... Hinge, 7, 7a, 7b ... Pin assembly, 8 ... Pin receiving member, 9 ... Pin insertion hole 10, 10a, 10b ... Pin, 11 , 11a ... trunk part, 12 ... tip part, 13 ... male thread part, 14a ... flat part, 15b ... insertion part, 16b ... bowl-like part, 19 ... tool hole, 20, 20b ... cover, 21 ... disk part, 22 , 22b ... cylindrical portion, 29 ... through hole, 31, 31b ... cylindrical portion, 32 ... head, 40, 40c, 40d, 40e ... fixing member, 47, 47c, 47d, 47e ... screw hole, 49, 49d, 49e ... opening, 50, 50c, 50e ... movable member, 51 ... female thread, 52, 52c, 52e ... external extension, 59 ... inner peripheral surface, 60, 60b ... spacer, 69 ... through hole, 70b ... drop-off prevention Member, 71b ... annular part, 72b ... inward extension part, 79b ... opening part, GP Grand piano

Claims (7)

A pin assembly for positioning the lid of the instrument housing and the main body,
A pin having a body portion inserted into a pin insertion hole provided in the main body;
A fixing member fixed to the lid;
A movable member movable along the plate surface of the lid;
With
A part of the movable member is disposed between the fixed member and the lid,
The pin assembly is configured such that a load in a direction from the lid toward the fixed member is applied to the movable member by attaching the pin to the movable member.
Pin assembly. The pin assembly according to claim 1, wherein
The pin has a pin attachment mechanism for attaching the pin to the movable member,
The pin attachment mechanism is provided at an end of the body portion on the movable member side, and has an attachment operation portion for performing an operation of attaching the pin to the movable member.
Pin assembly. The pin assembly according to claim 1, wherein
The pin has a pin attachment mechanism for attaching the pin to the movable member,
The pin attachment mechanism has a tool action portion that is provided at an end portion of the body portion on the movable member side and on which an attachment tool for attaching the pin to the movable member acts.
Pin assembly. The pin assembly according to any one of claims 1 to 3, further comprising:
A cover disposed between the barrel and the fixed member and configured to cover the movable member and the fixed member within a range in which the movable member is movable;
Pin assembly. The pin assembly according to any one of claims 1 to 4, further comprising:
A drop prevention member disposed between the movable member and the lid and fixed to the end of the pin on the lid side when the pin assembly is assembled;
Pin assembly. A pin assembly according to any one of claims 1 to 5,
The movable member is formed such that the distance between the outer edge of the movable member and the center of the movable member is unequal in the circumferential direction.
Pin assembly.   A musical instrument comprising the pin assembly according to any one of claims 1 to 6.

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