JP6020788B2 - Keyboard lid opening and closing device and keyboard instrument - Google Patents

Description

The present invention relates to a keyboard lid opening / closing device and a keyboard instrument used for a keyboard instrument such as a piano or an organ.

  For example, as described in Patent Document 1, a keyboard instrument such as a piano is known which is configured to cover a keyboard portion provided in a musical instrument case so as to be opened and closed with a keyboard lid. Such a keyboard lid opening / closing device is constructed such that an arm member attached to the keyboard lid is rotatably attached to a support shaft provided in the musical instrument case, and when the keyboard lid is opened and closed, the arm is interlocked with the keyboard lid opening / closing operation. The member is configured to rotate about the support shaft.

JP 2011-13250 A

  In order to open and close the keyboard lid safely, this type of keyboard lid opening and closing device includes a first damper member that constantly applies a constant load to the arm member to brake the keyboard lid opening and closing operation, and the keyboard lid closing and closing device. A second damper member that applies a load to the arm member according to the operation and brakes the closing operation of the keyboard lid, while applying a load to the arm member according to the opening operation of the keyboard lid and brakes the opening operation of the keyboard lid; I have.

  In such a keyboard lid opening and closing device, the first damper member always applies a constant load to the arm member to brake the keyboard lid opening and closing operation, and the second damper member responds to the keyboard lid closing operation. Further, a load is further applied to the arm member to brake the keyboard lid closing operation, and a load is further applied to the arm member in response to the keyboard lid opening operation to brake the keyboard lid opening operation.

  However, in such a keyboard lid opening / closing device, since the arm member is loaded by the first damper member and the second damper member, the keyboard lid opening / closing operation becomes heavy, and the keyboard lid can be opened / closed satisfactorily. In addition, when the keyboard lid is opened and closed by the second damper member, a load in the opposite direction must be applied to the arm member, so that the structure of the second damper member is complicated and the number of parts is reduced. There are many problems such as complicated production and high production costs.

The problem to be solved by the present invention is to provide a keyboard lid opening / closing device and a keyboard instrument that can open and close the keyboard lid safely and satisfactorily with a simple structure, low cost.

The present invention relates to an arm member that is rotatably attached to a musical instrument case and rotates together with an opening / closing operation of a keyboard lid that covers the keyboard portion so as to be freely opened and closed, and when the keyboard lid is opened to expose the keyboard lid, A first braking member that applies a load to the arm member and brakes the opening operation of the keyboard lid from the time when the rear portion moves rearward of the keyboard portion; and when the keyboard lid covers and closes the keyboard portion A second braking member that applies a load to the arm member from the time when the front portion of the keyboard lid moves to the front side of the keyboard portion and brakes the closing operation of the keyboard lid, The member is provided on the projection case provided on the arm member and the instrument case located at a position corresponding to the movement locus of the projection, and is directed from the open state side of the keyboard cover toward the closed state side of the keyboard cover. contact for the previous Ki突 raised portion in accordance with And a slope portion which pressure is gradually increased, a switchgear of the fallboard.
Further, the present invention provides an arm member that is rotatably attached to a musical instrument case and rotates together with an opening / closing operation of a keyboard lid that covers the keyboard portion so as to be opened and closed, and when the keyboard lid is opened to expose the keyboard portion, A first braking member that applies a load to the arm member and brakes the opening operation of the keyboard lid from the time when the rear portion of the keyboard lid moves to the rear of the keyboard portion, and the keyboard lid covers and closes the keyboard portion A second braking member for braking the closing operation of the keyboard lid by reducing the rotational speed of the arm member from the time when the front portion of the keyboard lid moves to the front side of the keyboard portion, A plurality of second braking members are provided on the elastic projections provided on the arm member and the instrument case located at a position corresponding to the movement locus of the elastic projections, and the elastic projections are elastically sequentially moved over. The braking protrusion A switchgear fallboard that.
Further, the present invention provides an arm member that is rotatably attached to a musical instrument case and rotates together with an opening / closing operation of a keyboard lid that covers the keyboard portion so that the keyboard portion can be opened and closed, and when the keyboard lid is opened to expose the keyboard portion A first braking member that applies a load to the arm member from the time when the rear portion of the lid moves to the rear of the keyboard portion and brakes the opening operation of the keyboard lid; and when the keyboard lid covers and closes the keyboard portion And a second braking member that applies a load to the arm member from the time when the front portion of the keyboard lid moves to the front side of the keyboard portion and brakes the closing operation of the keyboard lid, The brake member is a keyboard that is an elastic member that elastically biases the arm member in a direction to open the keyboard lid when the front portion of the keyboard lid is moved to the front side of the keyboard portion. It is a lid opening and closing device.

  According to the present invention, when the keyboard cover is opened to expose the keyboard part, a load is applied to the arm member by the first braking member so that the keyboard cover can be reliably and satisfactorily braked. When covering and closing the keyboard part, a load is applied to the arm member by the second braking member, and the keyboard lid can be reliably and satisfactorily braked. For this reason, when the keyboard cover is opened and when the keyboard cover is closed, the keyboard cover can be reliably and optimally braked by the individual braking members. Thereby, the structure of each of the first and second braking members is simple, the cost of the entire apparatus can be reduced, and the keyboard lid can be opened and closed safely and satisfactorily.

In 1st Embodiment which applied this invention to the keyboard musical instrument, it is sectional drawing of the principal part which showed the state which closed the keyboard cover and covered the keyboard part. FIG. 2 is a cross-sectional view of a main part of the keyboard instrument shown in FIG. 1 showing a state where a keyboard cover is opened and stored in a musical instrument case to expose a keyboard part. It is sectional drawing of the principal part which showed the state which opened the keyboard cover to the middle in the keyboard musical instrument shown in FIG. FIG. 4 is an enlarged front view of a main part showing a keyboard lid opening and closing device in the keyboard instrument shown in FIG. 3. FIG. 5 is an enlarged front view of a main part illustrating a state in which the keyboard lid is opened and stored in a musical instrument case in the keyboard musical instrument illustrated in FIG. 4. FIG. 5 is an enlarged plan view of a main part showing the keyboard lid opening and closing device shown in FIG. 4. It is an expanded sectional view of the principal part in the AA arrow of the keyboard lid opening / closing device shown in FIG. FIG. 8 is an enlarged cross-sectional view of a main part showing a state in which the keyboard lid is closed and the elastic protrusion is most strongly in elastic contact with the inclined groove in the keyboard lid opening and closing device shown in FIG. 7. FIG. 4 shows the arm member shown in FIG. 4, (a) is an enlarged plan view, (b) is an enlarged front view, (c) is an enlarged left side view, and (d) is an enlarged right side view. . In 2nd Embodiment which applied this invention to the keyboard musical instrument, it is the enlarged front view of the principal part which showed the opening / closing apparatus of the keyboard cover. It is an expanded sectional view of the principal part in the BB arrow view of the keyboard cover opening / closing device shown in FIG. FIG. 12 is an enlarged cross-sectional view of a main part showing a state in which the elastic protrusion sequentially climbs over a plurality of braking protrusions when the keyboard cover is closed in the keyboard cover opening and closing device shown in FIG. 11. It is the enlarged plan view of the principal part which showed the modification of the elastic protrusion part in each 1st, 2nd embodiment of this invention. In 3rd Embodiment which applied this invention to the keyboard musical instrument, it is the enlarged front view of the principal part which showed the opening / closing apparatus of the keyboard cover. It is an enlarged plan view of the principal part which showed the opening / closing apparatus of the keyboard cover shown by FIG. In 4th Embodiment which applied this invention to the keyboard musical instrument, it is the enlarged front view of the principal part which showed the opening / closing apparatus of the keyboard cover. FIG. 17 is an enlarged plan view of a main part showing the keyboard lid opening and closing device shown in FIG. 16.

(First embodiment)
A first embodiment in which the present invention is applied to a keyboard instrument will be described below with reference to FIGS.
This keyboard instrument includes a musical instrument case 1 as shown in FIGS. The musical instrument case 1 includes a pair of side plates 2 that also serve as legs, a bottom plate 3 that is a shelf plate provided at an upper position between the pair of side plates 2, and a front end portion of the bottom plate 3 (FIG. 1). In FIG. 1, the front plate 4 provided on the left end portion, the rear plate 5 provided on the rear end portion (right end portion in FIG. 1), the upper portion of the rear plate 5 and the rear side of the pair of side plates 2 And a top plate 6 provided over the top of the head.

  Thereby, the musical instrument case 1 is formed in a substantially box shape with the front side (left side in FIG. 1) of the top plate 6 opened as shown in FIGS. Inside the musical instrument case 1, a keyboard portion 7 is provided so as to be exposed upward. The keyboard section 7 includes a white key 7a and a black key 7b, and the white key 7a and the black key 7b are mounted on a keyboard chassis (not shown) provided on the bottom plate 3 so as to be rotatable in the vertical direction. In such a state, a large number are arranged.

  Further, as shown in FIGS. 1 to 3, a keyboard lid 8 that covers the keyboard portion 7 is provided at the upper portion of the musical instrument case 1 so as to be opened and closed by an opening / closing device 10. The keyboard lid 8 includes a front lid 8a and a rear lid 8b. The front lid 8a and the rear lid 8b are connected to each other by a hinge 9 so as to be bent. Further, as shown in FIG. 1, when the keyboard lid 8 is disposed above the keyboard portion 7 so as to cover and close the keyboard portion 7, the front lid 8a and the rear lid 8b are lowered forward (see FIG. 1). 1 is arranged so as to be inclined in a flat plate shape.

  Further, as shown in FIG. 3, when the front lid 8a and the rear lid 8b are moved above the keyboard portion 7 and opened, the keyboard lid 8 is bent by rotating the rear lid 8b around the hinge 9. However, it is configured to move to the lower side of the top plate 6. Further, as shown in FIG. 2, when the front lid 8a and the rear lid 8b are moved into the rear portion of the musical instrument case 1 and the keyboard portion 7 is opened as shown in FIG. The rear cover 8b is folded in a substantially right angle with respect to the front cover 8a with the hinge 9 as the center, and is stowed close to the inner surface of the rear plate 5 and stored in the instrument case 1 It is configured to be.

  In this case, the handle 11 is attached to the front end of the front lid 8a as shown in FIGS. A guide shaft portion 13 guided along a guide groove portion 12 provided on the inner surface of the side plate 2 of the musical instrument case 1 is provided at the lower end portion of the handle portion 11 so as to protrude toward the side plates 2 on both sides. . As shown in FIGS. 1 to 5, the guide groove portion 12 rises from the front side of the keyboard portion 7, extends rearward in a state inclined obliquely upward along the upper side of the keyboard portion 7, and a portion extending rearward Is provided on the inner surface of the side plate 2 of the musical instrument case 1 so as to be positioned below the front end of the top plate 6.

  Further, as shown in FIGS. 1 to 5, a guide support portion 15 that supports the keyboard lid 8 is provided on the inner surface of the side plate 2 of the musical instrument case 1. The guide support portion 15 is provided on the upper side of the portion located on the rear side of the guide groove portion 12. Thereby, as shown in FIG. 1, the guide support portion 15 supports the rear lid 8b and lowers the front lid 8a and the rear lid 8b forward when the keyboard lid 8 covers and closes the keyboard portion 7. It is configured to be supported in a flat plate shape in a state of being inclined (lower left in FIG. 1). Further, as shown in FIGS. 3 and 4, the guide support portion 15 corresponds to the hinge 9 so that the front lid 8a and the rear lid 8b bend at the hinge 9 when the keyboard lid 8 is partially opened. It is comprised so that the location to do may be supported.

  By the way, as shown in FIGS. 4 to 6, the opening / closing device 10 for opening and closing the keyboard lid is rotatably attached to the side plate 2 of the musical instrument case 1 and rotates with the opening / closing operation of the keyboard lid 8. When the keyboard lid 8 is opened to expose the keyboard portion 7, the arm member 16 is loaded to open the keyboard lid 8 when the rear portion of the rear lid 8 b of the keyboard lid 8 moves to the rear of the keyboard portion 7. The first braking member 17 that brakes the operation and the arm member from the time when the front portion of the front lid 8a of the keyboard lid 8 moves to the front side of the keyboard portion 7 when the keyboard lid 8 covers and closes the keyboard portion 7. And a second braking member 18 that applies a load to 16 and brakes the closing operation of the keyboard lid 8.

  As shown in FIGS. 4 to 6, the arm member 16 is rotatably attached at one end to a support shaft 20 provided on the side plate 2 of the musical instrument case 1, and a connecting shaft 21 at the other end by a presser plate 20 a. It is configured to be rotatably mounted. In this case, as shown in FIGS. 9 (a) to 9 (d), the arm member 16 bends the belt-shaped metal plate into a U-shaped cross section along its longitudinal direction, and the shaft mounting groove 16a at the tip. Is provided. The support shaft 20 is covered with a cover member 19.

  As shown in FIGS. 4 and 5, the cover member 19 is attached to the side plate 2 of the musical instrument case 1 by mounting screws 19 a in a configuration in which a metal plate is bent into a U-shaped cross section. The connecting shaft 21 is rotatably attached to an attachment plate 14 attached to the rear part of the rear cover 8b of the keyboard cover 8 while being attached to the other end of the arm member 16. Accordingly, as shown in FIGS. 1 to 3, the arm member 16 is connected to the rear cover 8 a of the keyboard cover 8 by the connecting shaft 21 in a rotatable state, thereby accompanying the opening / closing operation of the keyboard cover 8. Thus, it is configured to rotate around the support shaft 20.

  Therefore, as shown in FIG. 1, when the keyboard cover 8 covers and closes the keyboard portion 7, the arm member 16 rotates counterclockwise around the support shaft 20 and stands substantially vertically. When the keyboard lid 8 is opened, as shown in FIG. 3, the keyboard lid 8 is gradually tilted toward the rear (right side in FIG. 3) while rotating clockwise around the support shaft 20, and the keyboard lid 8 is further opened to open the instrument case. As shown in FIG. 2, when stored in 1, it rotates clockwise around the support shaft 20 and tilts downward (lower right in FIG. 2).

  In this case, the side plate 2 of the musical instrument case 1 is provided with a guide rail portion 22 for guiding the connecting shaft 21 of the arm member 16 as shown in FIGS. The guide rail portion 22 is formed in an arc shape centered on the support shaft 20 of the arm member 16, and the upper end portion thereof is above the rear end portion of the keyboard portion 7 and approaches the rear end portion of the guide support portion 15. The lower end portion is located above the rear portion of the bottom plate 3. In the guide rail portion 22, a guide groove 22 a into which the end portion 21 a of the connecting shaft 21 of the arm member 16 is movably inserted is provided in an arc shape with the support shaft 20 as the center, like the guide rail portion 22. .

  Further, as shown in FIGS. 4 to 6, a rack gear 23 is provided in the guide rail portion 22 along the guide groove 22 a. A pinion gear 24 that meshes with the rack gear 23 and rotates is attached to the connecting shaft 21 that connects the arm member 16 and the keyboard lid 8. As a result, when the arm member 16 rotates about the support shaft 20 in conjunction with the opening / closing operation of the keyboard cover 8, the pinion gear 24 meshes with the rack gear 23 and rotates to guide the keyboard cover 8. It is configured to open and close while.

  On the other hand, as shown in FIGS. 4 to 6, the first braking member 17 of the opening / closing device 10 starts when the rear part of the rear cover 8 b of the keyboard cover 8 moves to the rear of the keyboard part 7 when opening the keyboard cover 8. A torsion coil spring that biases the arm member 16 toward the direction in which the keyboard lid 8 is closed. That is, in the first braking member 17, the coil portion 17a of the torsion coil spring is wound around the support shaft 20 of the arm member 16, one end portion 17b of the coil portion 17a is elastically contacted with the arm member 16, and the other end portion 17c. Is configured to contact and be fixed to the lower mounting screw 19a of the cover member 19.

  Thus, as shown in FIGS. 3 and 4, when the first brake member 17 opens the keyboard cover 8 and exposes the keyboard part 7, the rear part of the rear cover 8 b of the keyboard cover 8 is located behind the keyboard part 7. When the arm member 16 is rotated by approximately half and positioned in the vicinity of the intermediate portion, the one end portion 17b of the coil portion 17a of the torsion coil spring is pressed against the arm member 16 in an elastic manner. The arm member 16 is configured to apply a load due to the spring force of the coil portion 17a to start braking against the opening operation of the keyboard lid 8.

  In addition, when the keyboard lid 8 is further opened and the arm member 16 is further rotated clockwise, the opening angle between the one end portion 17b and the other end portion 17c of the first brake member 17 is gradually increased. Accordingly, the coil portion 17a is gradually twisted and compressed along with this, whereby the load of the spring force on the arm member 16 is gradually increased.

  Further, as shown in FIGS. 2 and 5, the first braking member 17 is such that the front lid 8a of the keyboard lid 8 is positioned below the top plate 6 and the rear lid 8b stands up almost vertically. When the keyboard cover 8 is housed in the musical instrument case 1, the opening angle between the one end 17b and the other end 17c of the coil portion 17a is the narrowest, and accordingly, the coil portion 17a is most twisted and the arm member 16 is configured to apply the strongest spring force load and to apply the spring force load in the direction in which the keyboard cover 8 is closed, that is, in the direction in which the rear cover 8b of the keyboard cover 8 is pushed up.

  Further, as shown in FIGS. 4 to 6, the second braking member 18 of the opening / closing device 10 has a front portion of the front lid 8 a of the keyboard lid 8 when the keyboard lid 8 covers and closes the keyboard portion 7. It is a resistance member for decelerating the rotational speed of the arm member 16 from the time when it moves to the front side of the portion 7. The second braking member 18 includes an elastic projection 25 made of an elastic material such as rubber provided substantially in the middle in the longitudinal direction of the arm member 16, and a musical instrument case at a location corresponding to the movement locus of the elastic projection 25. 1 and an inclined groove portion 26 provided on the inner surface of the side plate 2.

  In this case, as shown in FIGS. 4 and 5, the inclined groove portion 26 is formed in an arc shape centered on the support shaft 20 of the arm member 16, and the keyboard lid 8 is opened and stored in the instrument case 1. 7, when the contact pressure with which the elastic projection 25 of the arm member 16 contacts is the lowest and the keyboard lid 8 covers the keyboard 7 and is closed as shown in FIG. In addition, the arm member 16 is formed so as to be gently inclined so that the contact pressure with which the elastic projection portion 25 contacts is highest.

  That is, as shown in FIGS. 2 and 5, the inclined groove 26 is formed from the position where the elastic protrusion 25 is located when the keyboard cover 8 is opened and the arm member 16 is located at the lowest position. As shown in FIG. 5, the semi-circular arc is formed over the portion where the elastic projection 25 is located when the keyboard lid 8 is closed and the arm member 16 is located on the uppermost side.

  Further, as shown in FIG. 1, the inclined groove portion 26 is formed from the location where the elastic projection portion 25 is located when the keyboard cover 8 is closed and the arm member 16 is located on the uppermost side, as shown in FIGS. As shown, the elastic projection 25 is located when the front lid 8a of the keyboard lid 8 is opened and the rear lid 8b is moved into the musical instrument case 1 and the arm member 16 is rotated approximately halfway. A region up to this point (a region indicated by a dotted oblique line in FIG. 4) is formed on the inclined surface 26a.

  As shown in FIGS. 7 and 8, the inclined surface 26a has a deep portion where the elastic projection 25 is located when the arm member 16 is in the vicinity of the intermediate position where the arm member 16 is rotated approximately half, and the keyboard lid 8 is closed and the arm is closed. When the member 16 is located on the uppermost side, the portion where the elastic protrusion 25 is located is inclined so as to be shallowest.

  In addition, as shown in FIGS. 4 and 5, the inclined groove portion 26 has the arm member 16 at the lowest position from the position where the elastic protrusion portion 25 is located in the vicinity of the intermediate position where the arm member 16 has rotated approximately half. A region up to a position where the elastic protrusion 25 is located in the state of being located on the side is formed on a deep flat surface.

  Thereby, as shown in FIG. 3, when the keyboard lid 8 covers and closes the keyboard portion 7, the second braking member 18 is configured so that the front portion of the front lid 8 a of the keyboard lid 8 is substantially in the middle of the keyboard portion 7. When the elastic protrusion 25 comes into contact with the inclined surface 26a of the inclined groove 26 and the contact pressure is generated from when the arm member 16 is moved upward, that is, when the arm member 16 is rotated approximately halfway and positioned near the intermediate portion, the arm pressure is generated. The member 16 is configured to apply a load due to frictional resistance to start braking against the closing operation of the keyboard lid 8.

  Further, the second brake member 18 has the elastic protrusion 25 along the inclined surface 26 a of the inclined groove 26 when the keyboard cover 8 further moves in the closing direction and the arm member 16 further rotates counterclockwise. By moving, the contact pressure of the elastic protrusion 25 with respect to the inclined surface 26a gradually increases, whereby the frictional resistance gradually increases, and a load due to this gradually increasing frictional resistance is applied to the arm member 16. It is configured.

  Further, as shown in FIG. 1, the second brake member 18 has the front lid 8a of the keyboard lid 8 positioned at the front end portion of the keyboard portion 7, and the front lid 8a and the rear lid 8b completely connect the keyboard portion 7. As shown in FIG. 8, the contact pressure of the elastic protrusion 25 with respect to the inclined surface 26a is the highest, and the frictional resistance is the highest, thereby increasing the load due to the highest frictional resistance. It is configured to be applied to the arm member 16.

Next, the operation of the opening / closing device 10 for the keyboard lid 8 will be described.
When the keyboard cover 8 covers the keyboard part 7 and opens from a closed state, the handle part 11 provided on the front cover 8a of the keyboard cover 8 is lifted and moved toward the rear side of the musical instrument case 1. At this time, as shown in FIG. 1, the first braking member 17 applies almost no load to the keyboard lid 8, but as shown in FIG. 8, the elastic protrusion 25 of the second braking member 18 is connected to the instrument case 1. Since the contact pressure that contacts the inclined surface 26a of the inclined groove portion 26 is high, the moving force when moving the keyboard lid 8 is heavy.

  Thus, when the keyboard lid 8 moves in the opening direction, as shown in FIGS. 1 and 3, the guide shaft portion 13 provided on the handle portion 11 of the front lid 8 a serves as the side plate 2 of the instrument case 1. The guide plate 12 moves while being guided along the guide groove 12 provided on the keyboard cover 8, and the end 21 a of the connecting shaft 21 provided on the mounting plate 14 of the rear cover 8 b of the keyboard cover 8 is provided on the side plate 2 of the instrument case 1. It moves while being guided along the guide groove 22a of the guide rail portion 22. At this time, the pinion gear 24 rotatably attached to the connecting shaft 21 meshes with the rack gear 23 provided on the guide rail portion 22 and rotates.

  As shown in FIGS. 3 and 4, when the keyboard cover 8 moves in the opening direction, the arm member 16 rotates clockwise around the support shaft 20, and the elastic protrusion 25 of the second braking member 18 is inclined. Since the groove 26 moves in a direction that gradually decreases along the inclined surface 26a, that is, in a deep direction, the contact pressure of the elastic protrusion 25 with respect to the inclined surface 26a of the inclined groove 26 gradually decreases, thereby moving the keyboard lid 8. The movement force is gradually lightened.

  When the keyboard lid 8 is opened in this way and the hinge 9 of the keyboard lid 8 is moved onto the guide support portion 15 as shown in FIGS. 3 and 4, the front lid 8a and the rear lid 8b of the keyboard lid 8 Is moved while being bent by the hinge 9, and the rear part of the rear cover 8 b is moved behind the keyboard part 7. As a result, the arm member 16 rotates about half of the clockwise direction around the support shaft 20, and a load due to the spring force of the first braking member 17 is applied to the arm member 16, so that the brake against the opening operation of the keyboard lid 8 is performed. Be started. At this time, as shown in FIG. 7, the elastic protrusion 25 of the second braking member 18 moves to a deep position of the inclined groove 26, so that the contact pressure of the elastic protrusion 25 with respect to the inclined groove 26 hardly occurs. .

  When the keyboard cover 8 is further moved in the opening direction and stored in the musical instrument case 1, the arm member 16 further rotates clockwise around the support shaft 20 as shown in FIGS. As the arm member 16 rotates, the spring force of the first braking member 17 gradually increases. That is, when the arm member 16 rotates clockwise, the one end portion 17b is pushed by the arm member 16 in a state where the other end portion 17c of the first braking member 17 is in contact with the mounting screw 19a of the cover member 19. The coil portion 17a of one braking member 17 is gradually twisted and compressed. Thereby, the spring force of the coil part 17a increases gradually, and the operation which opens the keyboard cover 8 is braked.

  In this state, the keyboard lid 8 is housed in the musical instrument case 1, and as shown in FIGS. 2 and 5, the front lid 8a of the keyboard lid 8 is positioned below the top plate 6, and the rear lid 8b is substantially the same. When standing upright, the load due to the spring force of the first braking member 17 is most strongly applied to the arm member 16. For this reason, the spring force of the first braking member 17 is biased in the direction of closing the keyboard lid 8, that is, in the direction of pushing up the rear lid 8 b of the keyboard lid 8, so that the keyboard lid 8 is vigorously stored in the instrument case 1. The keyboard lid 8 is housed in the musical instrument case 1 while moving slowly.

  On the other hand, when closing the keyboard lid 8, as shown in FIGS. 2 and 5, the keyboard lid 8 is closed by the spring force of the first braking member 17, that is, in the direction in which the rear lid 8b of the keyboard lid 8 is pushed up. Since it is biased, the front lid 8a of the keyboard lid 8 is pulled out with a light force. Also at this time, as shown in FIGS. 3 and 4, the guide shaft portion 13 of the handle portion 11 of the front lid 8 a moves while being guided along the guide groove portion 12 of the side plate 2 of the musical instrument case 1.

  Also, at this time, as shown in FIGS. 3 and 4, the end 21 a of the connecting shaft 21 of the mounting plate 14 of the rear cover 8 b of the keyboard cover 8 is provided on the guide rail portion 22 provided on the side plate 2 of the musical instrument case 1. While moving while being guided along the guide groove 22a, the pinion gear 24 rotatably attached to the connecting shaft 21 meshes with the rack gear 23 provided on the guide rail portion 22 and rotates. As a result, the arm member 16 rotates counterclockwise about the support shaft 20 as the rear cover 8b of the keyboard cover 8 moves.

  In this way, the keyboard lid 8 moves in the closing direction, and as shown in FIGS. 3 and 4, the front end portion of the front lid 8a is positioned almost above the middle portion of the keyboard portion 7, and the arm member 16 is substantially When it is rotated about halfway and located in the vicinity of the middle part, the biasing force due to the spring force of the first braking member 17 against the rear lid 8b of the keyboard lid 8 gradually decreases, and the biasing force due to almost the spring force is applied to the rear lid 8b. It will not be done. At this time, the rear lid 8b of the keyboard lid 8 is positioned on the upper side of the guide rail portion 22, and in this state, the guide shaft portion 13 of the front lid 8a of the keyboard lid 8 extends along the guide groove portion 12 inclined forward and downward. Since it moves, the keyboard cover 8 can be moved in a direction to close it with a light force.

  When the keyboard cover 8 is further moved in the closing direction, the rotation operation of the arm member 16 is braked by the second braking member 18 as shown in FIGS. That is, the elastic projection 25 of the second braking member 18 provided on the arm member 16 is deeper along the inclined surface 26 a in the inclined groove 26 of the second braking member 18 provided on the side plate 2 of the instrument case 1. Therefore, the contact pressure of the elastic protrusion 25 with respect to the inclined surface 26a of the inclined groove 26 gradually increases, and the closing operation of the keyboard lid 8 is braked.

  As a result, the closing speed of the keyboard lid 8 becomes slow, and the force for closing the keyboard lid 8 gradually increases. For this reason, as shown in FIG. 1, when the keyboard cover 8 completely covers and closes the keyboard portion 7, the elastic protrusion 25 of the second braking member 18 is formed on the inclined groove portion 26 as shown in FIG. 8. It makes the strongest elastic contact with the inclined surface 26a. Thereby, when the keyboard cover 8 is completely closed, the closing speed of the keyboard cover 8 is the slowest and the force for closing the keyboard cover 8 is the heaviest. As a result, the keyboard lid 8 can be safely and slowly closed without being suddenly closed.

  Thus, according to the opening / closing device 10 for the keyboard lid 8, the arm member 16 that is rotatably attached to the musical instrument case 1 and rotates together with the opening / closing operation of the keyboard lid 8, and the keyboard lid 8 is opened to open the keyboard portion 7. When exposing, the first brake member 17 that applies a load to the arm member 16 and brakes the opening operation of the keyboard lid 8 from the time when the rear portion of the keyboard lid 8 moves to the rear of the keyboard portion 7, and the keyboard lid 8 When the keyboard part 7 is covered and closed, the second brake is applied to apply a load to the arm member 16 from the time when the front part of the keyboard cover 8 moves to the front part side of the keyboard part 7 to brake the closing operation of the keyboard cover 8. Since the member 18 is provided, the overall cost of the apparatus can be reduced with a simple structure, and the keyboard lid 8 can be opened and closed safely and satisfactorily.

  That is, in the opening / closing device 10 for the keyboard lid 8, when the keyboard lid 8 is opened to expose the keyboard portion 7, a load is applied to the arm member 16 by the first braking member 17 so that the keyboard lid 8 is reliably and satisfactorily good. When the keyboard lid 8 covers and closes the keyboard portion 7, a load is applied to the arm member 16 by the second braking member 18 to reliably and satisfactorily brake the keyboard lid 8. it can.

  For this reason, in the opening / closing device 10 for the keyboard lid 8, when the keyboard lid 8 is opened and when the keyboard lid 8 is closed, the individual braking members by the first braking member 17 and the second braking member 18 are surely used. In addition, the opening / closing operation of the keyboard lid 8 can be optimally braked, whereby the structure of the first and second braking members 17 and 18 is simple, the overall cost of the apparatus can be reduced, and the keyboard lid can be achieved. 8 can be opened and closed safely and satisfactorily.

  In this case, when the first brake member 17 opens the keyboard lid 8, the first lid member 17 is moved by spring force to the arm member 16 from the time when the rear portion of the keyboard lid 8 moves to the rear of the keyboard portion 7 in the direction to close the keyboard lid 8. By being a torsion coil spring that urges a certain load, the keyboard lid 8 is not suddenly opened by the spring force of the first braking member 17 when the keyboard lid 8 is opened and stored in the musical instrument case 1. The keyboard cover 8 can be slowly housed in the musical instrument case 1, and when the keyboard cover 8 is closed, the keyboard cover 8 can be pulled out with a light force by the spring force of the first braking member 17. The opening / closing operability of the lid 8 can be improved.

  That is, the first braking member 17 is wound around a support shaft 20 in which a coil portion 17a of a torsion coil spring rotatably supports the arm member 16, and one end portion 17b of the coil portion 17a is elastically contacted with the arm member 16. Since the other end portion 17c is fixed in contact with the mounting screw 19a of the cover member 19 attached to the instrument case 1, when the keyboard cover 8 is opened and stored in the instrument case 1, the coil portion The keyboard cover 8 can be reliably and satisfactorily braked by the spring force caused by the twist of 17a, and when the keyboard cover 8 is closed, the keyboard cover 8 is moved by the spring force caused by the spring return force accompanying the twist of the coil portion 17a. Since it is biased in the closing direction, the keyboard lid 8 can be closed with a light force.

  In the opening / closing device 10, the rotation speed of the arm member 16 is increased from the time when the second braking member 18 moves the front part of the keyboard cover 8 to the front side of the keyboard part 7 when closing the keyboard cover 8. Due to the resistance member to be decelerated, when the keyboard lid 8 covers and closes the keyboard portion 7, the closing force of the keyboard lid 8 is increased by the resistance force of the second braking member 18 to increase the closing speed of the keyboard lid 8. Since it is possible to prevent the keyboard cover 8 from closing suddenly, the keyboard cover 8 can be closed safely and satisfactorily.

  In this case, the second braking member 18 is provided on the elastic projection 25 provided on the arm member 16 and the side plate 2 of the musical instrument case 1 corresponding to the movement trajectory of the elastic projection 25 and the keyboard lid 8 is opened. By having the inclined groove portion 26 that gradually increases the contact pressure of the elastic projection portion 25 from the side toward the closed state side of the keyboard lid 8, it is possible to reliably and satisfactorily friction when closing the keyboard lid 8. Resistance can be imparted.

  That is, the second braking member 18 is configured such that when the keyboard cover 8 closes over the keyboard part 7, the contact pressure of the elastic protrusions 25 with respect to the inclined surface 26 a of the inclined groove part 26 gradually increases. The closing force can be gradually increased to slow down the closing speed of the keyboard lid 8, thereby preventing the keyboard lid 8 from being suddenly closed. Therefore, the keyboard lid 8 can be safely and satisfactorily improved. Can be closed.

  In the opening / closing device 10, the keyboard lid 8 includes a front lid 8 a and a rear lid 8 b, and the front lid 8 a and the rear lid 8 b are connected to each other by a hinge 9 so that the keyboard lid 8 can be bent. When the cover 8 is closed and the front cover 8a and the rear cover 8b are arranged in a flat plate shape, the rear cover 8b is moved forward by the hinge 9 when the keyboard cover 8 is moved above the keyboard part 7 and opened. Since it is housed in the musical instrument case 1 while being bent with respect to the lid 8a, the keyboard lid 8 can be efficiently and compactly accommodated in the musical instrument case 1, thereby reducing the overall size of the musical instrument.

  Further, in the opening / closing device 10, a connecting shaft 21 that rotatably connects the keyboard lid 8 and the arm member 16, and a guide that is provided in the musical instrument case 1 and guides the connecting shaft 21 according to the opening / closing operation of the keyboard lid 8. Since the rail portion 22 is provided, the keyboard lid 8 can be smoothly and satisfactorily guided without causing the keyboard lid 8 to sway when the opening / closing lid 8 is opened / closed. Since it can be opened and closed in a stable state, the opening and closing operability of the keyboard lid 8 can be improved.

  Further, in this opening / closing device 10, a pinion gear 24 rotatably attached to a connecting shaft 21 that connects the keyboard lid 8 and the arm member 16, and a pinion gear 24 provided on the guide rail portion 22 mesh with each other to rotate and move. Since the rack shaft 23 is provided, when the opening / closing lid 8 is opened and closed, the connecting shaft 21 does not slide with respect to the guide rail portion 22, and the pinion gear 24 is engaged with the rack gear 23 to rotate. Accordingly, the opening / closing lid 8 can be opened and closed smoothly and satisfactorily in a more stable state.

(Second Embodiment)
Next, a second embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS. The same parts as those in the first embodiment shown in FIG. 1 to FIG.
As shown in FIGS. 10 to 12, the opening / closing device 30 for the keyboard lid 8 in this keyboard instrument has a second brake member 31 having a configuration different from that of the first embodiment, and is otherwise substantially the same as that of the first embodiment. It has become.

  That is, the second braking member 31 is configured so that the front portion of the front lid 8a of the keyboard lid 8 faces the front side of the keyboard portion 7 when the keyboard lid 8 covers and closes the keyboard portion 7 as in the first embodiment. This is a resistance member that decelerates the rotation speed of the arm member 16 from the time of movement, that is, from the time when the arm member 16 rotates approximately half and is positioned near the intermediate portion. The second braking member 31, which is a resistance member, includes an elastic protrusion 32 made of an elastic material such as rubber provided on the arm member 16, and the musical instrument case 1 located at a location corresponding to the movement locus of the elastic protrusion 32. A plurality of braking projections 33 which are provided on the inner surface of the side plate 2 and over which the elastic projections 32 are elastically sequentially moved.

  In this case, on the inner surface of the side plate 2 of the musical instrument case 1, as shown in FIGS. 10 to 12, a groove 34 that is curved in an arc shape with the support shaft 20 of the arm member 16 as the center is formed. The groove 34 is formed so that the keyboard cover 8 is closed and the arm member 16 is located on the uppermost side from the position where the elastic protrusion 32 is located when the keyboard cover 8 is opened and the arm member 16 is located on the lowest side. In the state, it is formed in a semicircular arc shape up to the location where the elastic protrusion 32 is located.

  As shown in FIG. 10, the groove portion 34 has a front lid of the keyboard lid 8 from a position where the elastic projection 32 is located when the keyboard lid 8 is closed and the arm member 16 is located on the uppermost side. When the rear cover 8b is moved into the musical instrument case 1 and the arm member 16 is rotated about half, the plurality of brakes are provided in the region between the positions where the elastic protrusions 32 are located. The protrusion 33 is formed in a radial shape with the support shaft 20 as the center.

  In this case, from the area where the plurality of braking protrusions 33 are not provided in the groove 34, that is, from the position where the elastic protrusion 32 is located in the vicinity of the intermediate position where the arm member 16 in the groove 34 is rotated approximately half. As shown in FIG. 10, the region between the portion where the elastic protrusion 32 is located when the arm member 16 is located at the lowest position is formed on a flat surface. For this reason, the braking protrusion 33 is not provided in the region of the flat surface.

  As a result, as shown in FIGS. 10 to 12, the second braking member 31 moves the front portion of the front lid 8 a of the keyboard lid 8 above the substantially middle portion of the keyboard portion 7 when closing the keyboard lid 8. From the point of time, that is, from the point when the arm member 16 rotates approximately half and is positioned in the vicinity of the middle part, the elastic member 32 first applies a load due to the resistance force over the brake member 33 to the arm member 16, 8 is configured to start braking for the closing operation.

  As shown in FIG. 1, the second braking member 31 is in a state where the front lid 8 a of the keyboard lid 8 is positioned at the front end of the keyboard portion 7 when the keyboard lid 8 covers and closes the keyboard portion 7. In this case, the elastic protrusion 32 repeatedly applies the resistance load caused by overcoming the plurality of braking protrusions 33 to the arm member 16 repeatedly, thereby braking the closing operation of the keyboard lid 8. Has been.

  According to the opening / closing device 30 for the keyboard lid 8 as described in the first embodiment, when the keyboard lid 8 is opened to expose the keyboard portion 7, a load is applied to the arm member 16 by the first braking member 17. The keyboard lid 8 can be reliably and satisfactorily braked, and when the keyboard lid 8 covers and closes the keyboard portion 7, a load is applied to the arm member 16 by the second braking member 31 so that the keyboard lid 8 is It is possible to reliably and satisfactorily brake.

  For this reason, also in the opening / closing device 30 of the keyboard lid 8, as in the first embodiment, when the keyboard lid 8 is opened and when the keyboard lid 8 is closed, the first braking member 17 and the second braking member 31 are used. The individual brake members can reliably and optimally brake the opening / closing operation of the keyboard lid 8, thereby simplifying the structure of the first and second brake members 17, 31 and reducing the overall cost of the apparatus. It is possible to open and close the keyboard lid 8 safely and satisfactorily.

  In this case, the second braking member 31 is configured so that the rotation speed of the arm member 16 starts when the front portion of the keyboard lid 8 moves to the front portion side of the keyboard portion 7 when the keyboard lid 8 covers and closes the keyboard portion 7. When the keyboard lid 8 covers and closes the keyboard portion 7 when the keyboard lid 8 is closed, the closing force of the keyboard lid 8 is increased by the resistance force of the second braking member 31 and the keyboard lid 8 is closed. Thus, it is possible to reliably prevent the keyboard lid 8 from closing suddenly, so that the keyboard lid 8 can be closed safely and satisfactorily.

  That is, the second braking member 31 is provided on the elastic projection 32 provided on the arm member 16 and on the side plate 2 of the musical instrument case 1 located at a location corresponding to the movement locus of the elastic projection 32. Since the part 32 has a plurality of braking protrusions 33 that sequentially and elastically move over, the elastic protrusion 32 displaces the plurality of braking protrusions 33 when the keyboard lid 8 covers and closes the keyboard part 7. By repeatedly applying the resistance force by sequentially moving over to the keyboard cover 8, the closing speed of the keyboard cover 8 can be slowed, so that it is possible to reliably prevent the keyboard cover 8 from closing suddenly. The keyboard lid 8 can be closed safely and satisfactorily.

  In each of the first and second embodiments described above, the case where the elastic protrusions 25 and 32 of the second braking members 18 and 31 are formed of an elastic material such as rubber has been described. For example, you may comprise the elastic protrusion part 36 like the modification shown in FIG. That is, the elastic protrusion 36 of this modification has a configuration including a spring member 37 provided on the arm member 16 and a cap portion 38 attached to the spring member 37.

  If the elastic protrusion 36 is configured in this way, the spring force of the spring member 37 is adjusted by adjusting the spring force of the spring member 37 when the cap portion 38 is elastically pressed against the inclined groove 26 or the brake protrusion 33 by the spring force of the spring member 37. Since the contact pressure of the cap portion 38 can be adjusted to an optimum state, the opening / closing operation of the keyboard lid 8 can be braked better than in the first and second embodiments described above.

  In the first and second embodiments described above and the modifications thereof, the second braking members 18, 31 are provided with the elastic protrusions 25, 32, 36 provided on the arm member 16, and the side plate of the musical instrument case 1. 2 has been described, but the present invention is not limited to this. For example, the arm member 16 is provided with a protrusion that does not elastically deform, and the protrusion of the protrusion A leaf spring is provided on the side plate 2 of the musical instrument case 1 located at a position corresponding to the movement locus, and the contact pressure with respect to the protruding portion of the arm member 16 is changed according to the rotation operation of the arm member 16 by the spring force of the leaf spring. You may comprise as follows.

(Third embodiment)
Next, a third embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS. Also in this case, the same parts as those in the first embodiment shown in FIGS.
As shown in FIGS. 14 and 15, the opening / closing device 40 of the keyboard lid 8 in this keyboard musical instrument has a second brake member 41 having a configuration different from that of the first embodiment, and the other configurations are substantially the same as those of the first embodiment. It has become.

  As shown in FIG. 14, the second braking member 41 opens the keyboard lid 8 when the front portion of the front lid 8 a is moved to the front side of the keyboard portion 7 when the keyboard lid 8 is closed. This is a biasing member that biases the arm member 16 toward. The second braking member 41, which is an urging member, is an arm member that faces the opening direction of the keyboard lid 8 when the front portion of the front lid 8 a of the keyboard lid 8 is moved to the front side of the keyboard portion 7. 16 is a coil spring that elastically biases the connecting shaft 21 provided at the distal end portion of the 16 and is disposed in the guide groove 22 a of the guide rail portion 22.

  That is, as shown in FIGS. 14 and 15, the second braking member 41 is disposed at a position located on the upper end side in the guide groove 22 a of the guide rail portion 22. Thereby, when the keyboard cover 8 covers and closes the keyboard portion 7, the second braking member 41 gradually compresses the coil spring by elastically contacting the connecting shaft 21 of the arm member 16, and the compressed coil spring. By applying a load due to the spring force to the arm member 16, the counterclockwise rotational force of the arm member 16 is gradually increased to slow the counterclockwise rotational speed of the arm member 16. ing.

  Further, as shown in FIGS. 14 and 15, the second braking member 41 has a spring force due to a spring restoring force of a compressed coil spring when the keyboard lid 8 is opened from a closed state covering the keyboard portion 7. Thus, the connecting shaft 21 of the arm member 16 is urged toward the opening direction of the keyboard lid 8, and the arm member 16 is urged clockwise about the support shaft 20, so that the keyboard lid 8 can be moved with a light force. It is configured to move in the opening direction.

  According to such an opening / closing device 40 of the keyboard lid 8, as in the first embodiment, when the keyboard lid 8 is opened to expose the keyboard portion 7, a load is applied to the arm member 16 by the first braking member 17. The keyboard lid 8 can be reliably and satisfactorily braked, and when the keyboard lid 8 covers and closes the keyboard portion 7, a load is applied to the arm member 16 by the second braking member 41 so that the keyboard lid 8 is It is possible to reliably and satisfactorily brake.

  For this reason, also in the opening / closing device 40 of the keyboard lid 8, as in the first embodiment, when the keyboard lid 8 is opened and when the keyboard lid 8 is closed, the first braking member 17 and the second braking member 41 are used. The individual brake members can reliably and optimally brake the opening / closing operation of the keyboard lid 8, thereby simplifying the structure of the first and second brake members 17 and 41 and reducing the overall cost of the apparatus. It is possible to open and close the keyboard lid 8 safely and satisfactorily.

  In this case, the second braking member 41 biases the arm member 16 toward the opening direction of the keyboard lid 8 when the front portion of the keyboard lid 8 is moved to the front side of the keyboard portion 7. By being a biasing member, when the keyboard lid 8 covers and closes the keyboard portion 7, the closing force of the keyboard lid 8 is increased by the biasing force of the second braking member 41, thereby slowing down the keyboard lid 8. As a result, it is possible to prevent the keyboard lid 8 from closing suddenly, so that the keyboard lid 8 can be closed safely and satisfactorily.

  That is, the second braking member 41 is configured such that the front end of the arm member 16 faces the opening direction of the keyboard lid 8 when the front portion of the front lid 8a of the keyboard lid 8 is moved to the front side of the keyboard portion 7. When the keyboard lid 8 covers and closes the keyboard portion 7, the coupling shaft 21 of the arm member 16 elastically contacts and gradually compresses the coil spring. Thus, the load due to the spring force of the coil spring to be compressed can be elastically applied to the arm member 16, thereby gradually increasing the rotational force of the arm member 16 and slowing down the rotational speed of the arm member 16. can do.

  Further, in the second braking member 41, when the keyboard lid 8 is opened from the closed state so as to cover the keyboard portion 7, the connecting shaft 21 of the arm member 16 is moved by the spring force due to the spring restoring force of the compressed coil spring. Since it can be urged toward the opening direction of the lid 8, the arm member 16 can be rotated clockwise with a light force around the support shaft 20, and the keyboard lid 8 can be opened with a light force. Since it can be moved, and the keyboard lid 8 can be moved smoothly and satisfactorily in the opening direction, the opening / closing operability of the keyboard lid 8 can be improved.

  In the third embodiment described above, the case where a coil spring is used as the second braking member 41 has been described. However, the present invention is not limited to this. For example, when the keyboard lid 8 covers and closes the keyboard portion 7, the arm member 16 is used. A configuration in which an elastic member such as rubber, elastomer, or sponge is disposed in the guide groove 22a of the guide rail portion 22 at the position where the connecting shaft 21 is located. Thus, even if the second braking member 41 is formed of an elastic member, there are substantially the same functions and effects as in the third embodiment described above.

(Fourth embodiment)
Next, a fourth embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS. Also in this case, the same parts as those in the first embodiment shown in FIGS.
As shown in FIGS. 16 and 17, the opening / closing device 50 of the keyboard lid 8 in this keyboard instrument has a second brake member 51 that is different from the first embodiment, and is otherwise substantially the same as the first embodiment. It has become.

  As shown in FIGS. 16 and 17, the second braking member 51 opens the keyboard lid 8 when the front portion of the front lid 8 a moves to the front side of the keyboard portion 7 when closing the keyboard lid 8. It is a biasing member that biases the arm member 16 in the direction. The second braking member 51, which is an urging member, is an arm member that faces the opening direction of the keyboard lid 8 when the front portion of the front lid 8 a of the keyboard lid 8 is moved to the front side of the keyboard portion 7. This is a torsion coil spring that elastically rotates 16.

  That is, as shown in FIGS. 16 and 17, the second braking member 51 includes a coil portion 53 wound around an attachment column 52 attached to the cover member 19 provided on the side plate 2 of the musical instrument case 1. One end portion 53 a of the coil portion 53 is elastically contacted with the arm member 16, and the other end portion 53 b of the coil portion 53 is fixed in contact with the cover member 19, whereby the arm member 16 is watched around the support shaft 20. It is comprised so that it may urge in the rotation direction.

  Accordingly, as shown in FIGS. 16 and 17, the second brake member 51 is gradually twisted with the rotation of the arm member 16 when the keyboard lid 8 covers and closes the keyboard portion 7. By applying a spring force load to the arm member 16 by twisting the coil portion 53, the rotational force of the arm member 16 in the counterclockwise direction (that is, the direction in which the keyboard cover 8 is closed) is gradually increased. Thus, the rotational speed of the arm member 16 in the counterclockwise direction is decreased.

  Further, as shown in FIGS. 16 and 17, the second braking member 51 has a spring return of the coil portion 53 that is twisted and compressed when the keyboard lid 8 is opened from a closed state covering the keyboard portion 7. The arm member 16 is urged toward the opening direction of the keyboard lid 8 by the spring force due to the force, and the arm member 16 is urged clockwise about the support shaft 20, so that the keyboard lid 8 is moved with a light force. It is configured to move in the opening direction.

  According to such an opening / closing device 50 for the keyboard lid 8, as in the first embodiment, when the keyboard lid 8 is opened to expose the keyboard portion 7, a load is applied to the arm member 16 by the first braking member 17. The keyboard lid 8 can be reliably and satisfactorily braked, and when the keyboard lid 8 covers and closes the keyboard portion 7, a load is applied to the arm member 16 by the second braking member 51 so that the keyboard lid 8 is It is possible to reliably and satisfactorily brake.

  For this reason, also in the opening / closing device 50 of the keyboard lid 8, the first braking member 17 and the second braking member 51 are used when the keyboard lid 8 is opened and when the keyboard lid 8 is closed, as in the first embodiment. The opening and closing operation of the keyboard lid 8 can be reliably and optimally braked by the individual braking member, thereby simplifying the structure of the first and second braking members 17 and 51 and reducing the overall cost of the apparatus. It is possible to open and close the keyboard lid 8 safely and satisfactorily.

  In this case, the second braking member 51 biases the arm member 16 toward the opening direction of the keyboard lid 8 when the front portion of the keyboard lid 8 is moved to the front portion side of the keyboard portion 7. By being a biasing member, when the keyboard lid 8 covers and closes the keyboard portion 7, the closing force of the keyboard lid 8 is increased by the biasing force of the second braking member 51, thereby slowing down the keyboard lid 8. As a result, it is possible to reliably prevent the keyboard lid 8 from closing suddenly, so that the keyboard lid 8 can be closed safely and satisfactorily.

  That is, the second braking member 51 elastically moves the arm member 16 toward the opening direction of the keyboard cover 8 when the front part of the front cover 8a of the keyboard cover 8 is moved to the front part side of the keyboard part 7. When the keyboard lid 8 covers and closes the keyboard portion 7, the coil portion 53 is gradually twisted and compressed as the arm member 16 is rotated. The load by the spring force of the coil portion 53 to be applied can be applied to the arm member 16, whereby the rotational force of the arm member 16 can be gradually increased to increase the closing operation of the keyboard lid 8, and the arm It is possible to slow down the closing operation of the keyboard lid 8 by slowing the rotation speed of the member 16.

  Further, in the second braking member 51, when the keyboard cover 8 covers the keyboard part 7 and is opened from the closed state, the arm member 16 is moved by the spring force generated by the spring restoring force of the coil part 53 that is twisted and compressed. Since it can be urged toward the opening direction of the keyboard cover 8, the keyboard cover 8 is opened with a light force when the arm member 16 rotates clockwise around the support shaft 20 to open the keyboard cover 8. Since the keyboard cover 8 can be smoothly and satisfactorily opened, the opening / closing operability of the keyboard cover 8 can be improved.

  In the above-described fourth embodiment, the case where a torsion coil spring is used as the second braking member 51 has been described. However, the present invention is not limited to this. For example, one end elastically contacts the arm member 16 and the other end covers the cover member 19. It may be a leaf spring that urges the arm member 16 in the clockwise direction when the keyboard lid 8 covers and closes the keyboard portion 7. Thus, even if a leaf spring is used as the second braking member, there are substantially the same functions and effects as in the fourth embodiment described above.

  In the first to fourth embodiments and the modifications thereof described above, the keyboard lid 8 includes the front lid 8a and the rear lid 8b, and the front lid 8a and the rear lid 8b can be bent by a hinge 9. Although the case where it is the structure which connected is described, it is not restricted to this, The keyboard cover of the structure divided | segmented into 3 or more cover parts and connected so that each can be bent by the hinge 9 may be sufficient, The structure which formed the keyboard cover with the board may be sufficient.

As mentioned above, although several embodiment of this invention was described, this invention is not restricted to these, The invention described in the claim and its equal range are included.
The invention described in the claims of the present application will be appended below.

(Appendix)
The invention according to claim 1 is a keyboard lid opening / closing device that is attached to a musical instrument case having a keyboard portion and covers the keyboard portion so as to be freely opened and closed, and is rotatably attached to the musical instrument case to open and close the keyboard lid. An arm member that rotates with operation, and when the keyboard cover is opened to expose the keyboard part, a load is applied to the arm member from a point in time when the rear part of the keyboard cover moves to the rear of the keyboard part. A first braking member that brakes the opening operation of the lid; and when the keyboard lid covers and closes the keyboard portion, the arm member from the time when the front portion of the keyboard lid moves to the front side of the keyboard portion. A keyboard lid opening and closing device comprising: a second braking member that applies a load to brake the closing operation of the keyboard lid.

  According to a second aspect of the present invention, in the keyboard lid opening and closing device according to the first aspect, the rear portion of the keyboard lid is moved rearward of the keyboard portion when the first lid is opened. The keyboard lid opening and closing device is a spring member that biases the arm member toward the closing direction of the keyboard lid from a point in time.

  According to a third aspect of the present invention, in the keyboard lid opening and closing device according to the first or second aspect, the second brake member is configured such that the front portion of the keyboard lid is the keyboard portion when the keyboard lid is closed. An opening / closing device for a keyboard cover, which is a resistance member that decelerates the rotational speed of the arm member from the time when the arm member moves to the front side.

  According to a fourth aspect of the present invention, in the keyboard lid opening and closing device according to the third aspect, the second braking member as the resistance member includes an elastic protrusion provided on the arm member, and the elastic protrusion. An inclined portion that is provided in the instrument case located at a location corresponding to the movement locus of the keyboard and gradually increases the contact pressure with respect to the elastic protrusion from the open state side of the keyboard cover toward the closed state side of the keyboard cover. A keyboard lid opening and closing device characterized by comprising:

  According to a fifth aspect of the present invention, in the keyboard lid opening and closing device according to the third aspect, the second braking member as the resistance member includes an elastic protrusion provided on the arm member, and the elastic protrusion. An opening / closing device for a keyboard cover, comprising: a plurality of braking protrusions provided on the instrument case located at a position corresponding to a movement locus of .

  According to a sixth aspect of the present invention, in the keyboard lid opening and closing device according to the first or second aspect, the second brake member is configured such that the front portion of the keyboard lid is the keyboard portion when the keyboard lid is closed. An opening / closing device for a keyboard lid, which is an urging member that urges the arm member in a direction in which the keyboard lid is opened from the time when it has moved to the front side.

  According to a seventh aspect of the present invention, in the keyboard lid opening and closing device according to the sixth aspect, the second braking member, which is the biasing member, has a front portion of the keyboard lid on the front side of the keyboard portion. A keyboard lid opening and closing device characterized by being an elastic member that elastically biases the arm member toward a direction in which the keyboard lid is opened when moved.

  According to an eighth aspect of the present invention, in the keyboard lid opening and closing device according to the sixth aspect, the second braking member as the biasing member has one end fixed to the instrument case and the other end. Is a spring that elastically biases the arm member toward the direction of opening the keyboard lid when the arm member is in elastic contact with the arm member and the front portion of the keyboard lid is moved to the front side of the keyboard portion. A keyboard lid opening and closing device characterized by being a member.

  According to a ninth aspect of the present invention, in the keyboard lid opening and closing device according to any one of the first to eighth aspects, the keyboard lid is connected so that a plurality of lid portions can be bent, and covers the keyboard portion. The plurality of lids are arranged in a flat plate shape when closed, and the plurality of lids are stored in the instrument case while being bent when moving and opening above the keyboard part. And a keyboard lid opening and closing device.

  A tenth aspect of the present invention is the keyboard lid opening and closing device according to any one of the first to ninth aspects, wherein the keyboard lid and the arm member are rotatably coupled to each other, and the instrument case And a guide rail portion that guides the connecting shaft in accordance with the opening / closing operation of the keyboard lid.

  The invention according to claim 11 is the keyboard lid opening and closing device according to claim 10, wherein the pinion gear rotatably attached to the connecting shaft and the pinion gear provided on the guide rail portion mesh with each other. A keyboard lid opening and closing device comprising a rack gear that rotates and moves.

DESCRIPTION OF SYMBOLS 1 Musical instrument case 7 Keyboard part 8 Keyboard cover 8a Front cover 8b Rear cover 9 Hinge 10, 30, 40, 50 Opening and closing device 16 Arm member 17 First braking member 17a Coil part 17b One end part of the coil part 17c The other end part of the coil part 18, 31, 41, 51 Second braking member 20 Support shaft 21 Connecting shaft 22 Guide rail portion 22a Guide groove 23 Rack gear 24 Pinion gear 25, 32, 36 Elastic projection portion 26 Inclined groove portion 26a Inclined surface 33 Braking projection portion 53 Coil portion 53a One end of the coil part 53b The other end of the coil part

Claims (8)

An arm member that is rotatably attached to the musical instrument case and rotates together with an opening / closing operation of a keyboard lid that covers the keyboard portion so as to be freely opened and closed;
When the keyboard cover is opened to expose the keyboard part, a load is applied to the arm member from the time when the rear part of the keyboard cover moves to the rear of the keyboard part to brake the opening operation of the keyboard cover. 1 braking member;
When the keyboard cover covers and closes the keyboard part, a load is applied to the arm member from the time when the front part of the keyboard cover moves to the front part side of the keyboard part to brake the closing operation of the keyboard cover. A second braking member that
The second braking member is provided in a projection provided on the arm member and the instrument case located at a position corresponding to a movement locus of the projection, and the keyboard lid is closed from the opened state side of the keyboard lid. contact pressure against front Ki突 raised portion toward the state side and a progressively higher becomes the inclined portion, the opening and closing device of the fallboard.   2. The keyboard lid opening and closing device according to claim 1, wherein the first braking member is configured to close the keyboard lid from the point in time when the rear portion of the keyboard lid moves to the rear of the keyboard portion when the keyboard lid is opened. An opening / closing device for a keyboard lid, which is a spring member that biases the arm member toward the head. An arm member that is rotatably attached to the musical instrument case and rotates together with an opening / closing operation of a keyboard lid that covers the keyboard portion so as to be freely opened and closed;
When the keyboard cover is opened to expose the keyboard part, a load is applied to the arm member from the time when the rear part of the keyboard cover moves to the rear of the keyboard part to brake the opening operation of the keyboard cover. 1 braking member;
When the keyboard cover covers and closes the keyboard part, the rotation speed of the arm member is reduced from the time when the front part of the keyboard cover moves to the front part side of the keyboard part, and the keyboard cover is closed. A second braking member for braking,
The second braking member is provided in an elastic projection provided on the arm member and the instrument case located at a position corresponding to a movement locus of the elastic projection, and the elastic projection sequentially and elastically moves over. A keyboard lid opening and closing device having a plurality of braking protrusions. An arm member that is rotatably attached to the musical instrument case and rotates together with an opening / closing operation of a keyboard lid that covers the keyboard portion so as to be freely opened and closed;
When the keyboard cover is opened to expose the keyboard part, a load is applied to the arm member from the time when the rear part of the keyboard cover moves to the rear of the keyboard part to brake the opening operation of the keyboard cover. 1 braking member;
When the keyboard cover covers and closes the keyboard part, a load is applied to the arm member from the time when the front part of the keyboard cover moves to the front part side of the keyboard part to brake the closing operation of the keyboard cover. A second braking member that
The second braking member is an elastic member that elastically urges the arm member in a direction to open the keyboard lid when the front portion of the keyboard lid is moved to the front side of the keyboard portion. A keyboard lid opening and closing device.   The keyboard lid opening and closing device according to any one of claims 1 to 4, wherein the keyboard lid is configured such that a plurality of lid portions are connected so as to be able to be bent, and the plurality of lids are closed when covering the keyboard portion. And a lid opening / closing device for the keyboard lid that is housed in the musical instrument case while the lids are bent when the lid portion is arranged in a flat plate shape and is moved and opened above the keyboard portion.   The keyboard lid opening / closing device according to any one of claims 1 to 5, wherein a connecting shaft that rotatably connects the keyboard lid and the arm member, and an opening / closing of the keyboard lid provided on the instrument case. A keyboard lid opening and closing device comprising a guide rail portion for guiding the connecting shaft according to an operation.   7. A keyboard lid opening and closing device according to claim 6, comprising: a pinion gear rotatably attached to the connecting shaft; and a rack gear provided on the guide rail portion and meshed with the pinion gear to rotate. Opening and closing device for the lid. Keyboard part,
Instrument case,
A keyboard lid rotatably attached to the instrument case;
The keyboard lid opening and closing device according to any one of claims 1 to 7,
Keyboard instrument with

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