JP6341404B2 - Fall prevention device and keyboard instrument - Google Patents

Description

  The present invention relates to a tipping prevention device for preventing tipping of a keyboard instrument or furniture, and a keyboard instrument provided with the tipping prevention device.

  For example, in furniture such as a bag, as described in Patent Document 1, an anti-tip tool is disposed between the lower front end of the furniture and a mounting surface such as a floor so that the furniture leans against a wall. What is configured to prevent the furniture from falling forward due to an earthquake is known.

Japanese Patent Laid-Open No. 08-332131

  In such a fall prevention device, since it is arranged to protrude from the lower front end of the furniture to the front side, there is a risk of being injured and hitting the toes. In addition, when this fall prevention tool is used for a keyboard instrument, there is a problem that it is difficult to play because the keyboard part is tilted forward.

  The problem to be solved by the present invention is to provide an overturn prevention device capable of preventing the casing from overturning due to vibrations such as an earthquake without disturbing it, and a keyboard instrument provided therewith.

One aspect of the invention, the rear side of the housing, and the guide portion the shaft is to guide and locking shaft provided laterally in front Symbol lock shaft in the vertical direction, the vertical direction while being guided by the front Symbol guide portion A support protrusion that protrudes on the movement locus of the lock shaft that moves to support the lock shaft, and a biasing member that urges the support protrusion toward the movement locus of the lock shaft. When the support protrusion supports the lock shaft, and when a vibration of a set value or more is applied to the housing, the support protrusion is separated from the movement locus of the lock shaft, An overturn prevention device comprising: a lock support mechanism portion that is arranged below the support projection portion when the lock shaft is guided downward by the guide portion. is there.

  According to the present invention, when the housing is subjected to vibration such as an earthquake, the lock support mechanism that locks the lock shaft provided at the rear end of the housing can be unlocked. The rear end of the housing can be lowered to tilt the housing backward. As a result, it is possible to prevent the casing from falling down due to vibrations such as an earthquake, and it is not necessary to install it at the front end of the casing, so that it does not get in the way.

It is the front view which showed one Embodiment which applied this invention to the keyboard musical instrument. It is sectional drawing in the AA arrow of the keyboard musical instrument shown by FIG. FIG. 3 is an enlarged cross-sectional view showing a fall prevention device installed at a lower end of the rear end of the keyboard instrument shown in FIG. 2. FIG. 4 is an enlarged cross-sectional view of a main part showing a mounting bracket and a lock shaft provided at the lower rear end of the keyboard instrument in the fall prevention device shown in FIG. 3. FIG. 4 is an enlarged cross-sectional view of a main part showing a support member and a lock support mechanism in the fall prevention device shown in FIG. 3. 3 shows a cross-section of the overturn prevention device shown in FIG. 3, (a) is an enlarged cross-sectional view taken along line BB in FIG. 3, and (b) is an enlarged cross-sectional view taken along line CC in FIG. 3. FIG. 3 is a cross-sectional view showing a state in which the keyboard instrument shown in FIG. 2 is tilted backward. FIG. 8 is an enlarged cross-sectional view showing a fall prevention device for a keyboard instrument in the state shown in FIG. 7.

Hereinafter, an embodiment in which the present invention is applied to a keyboard instrument will be described with reference to FIGS.
The keyboard instrument includes a musical instrument case 1 as shown in FIGS. The musical instrument case 1 includes a case main body 3 that houses a keyboard portion 2, a pair of leg portions 4 that support the case main body 3, and reinforcements that are beamed to an intermediate portion at the rear end portions of the pair of leg portions 4. And a plate 5.

  As shown in FIGS. 1 and 2, the case body 3 is formed in a box shape that is long in the lateral direction. That is, the case body 3 includes a shelf plate 6 that is beamed to the upper lower side of the pair of leg portions 4 that also serve as side plates, a front plate 7 provided at the front end portion of the shelf plate 6, and the shelf plate 6. A rear plate 8 provided at the rear end portion, and a top plate 9 bridged between the upper end portion of the rear plate 8 and the upper end portions of the pair of leg portions 4 serving as side plates are provided.

  As shown in FIG. 2, the keyboard unit 2 has a large number of keys 2 b arranged in parallel on a keyboard chassis 2 a, and is arranged in the case body 3. Further, the pair of leg portions 4 are configured such that each lower end portion thereof is slightly inclined upward from the front end portion (left end portion in FIG. 2) toward the rear end portion (right end portion in FIG. 2). ing.

  As shown in FIGS. 2 and 3, a fall prevention device 10 is provided at each of the rear end lower portions of the pair of legs 4 located on both sides of the musical instrument case 1. As shown in FIGS. 3 to 6, the overturn prevention device 10 is disposed on a mounting surface T such as a floor on which a lock shaft 11 provided at a lower rear end of the leg portion 4 and the musical instrument case 1 are disposed. And a lock support mechanism portion 13 that removably supports the lock shaft 11 in a state in which the rear end portion of the instrument case 1 is pushed up.

  In this case, as shown in FIGS. 3 and 4, a notch portion 4 a is formed in a reverse step shape at the rear end lower portion of the pair of leg portions 4. That is, the notch 4a is formed in a shape having a wide lower side and a narrow upper side. A mounting bracket 14 is attached to the lower rear end of the notch 4a with a screw 15.

  As shown in FIGS. 3, 4 and 6A, the mounting bracket 14 includes a fixing portion 14a attached to the lower rear end portion of the notch portion 4a of the leg portion 4 with a screw 15, and the fixing portion 14a. And a pair of mounting pieces 14b extending from the both sides (the front and back sides of the paper surface in FIG. 4) to the rear of the leg portion 4 (the right side in FIG. 4).

  As shown in FIGS. 3, 4 and 6A, the lock shaft 11 is formed in a round bar shape and is inserted into each mounting hole 14c provided in the pair of mounting pieces 14b of the mounting bracket 14 so as to be on both sides. It is attached in a protruding state. As a result, the lock shaft 11 is attached to the lower part of the rear end of the leg portion 4 via the attachment fitting 14.

  As shown in FIGS. 3, 5, and 6, the support member 12 is disposed on a placement surface T such as a floor on which the musical instrument case 1 is disposed, and first support for guiding the lock shaft 11 in the vertical direction. A body 16 and a second support 17 that is disposed so as to protrude from the rear end of the first support 16 to the rear of the instrument case 1 and to which the lock support mechanism 13 is attached.

  As shown in FIGS. 3, 5, and 6, the first support 16 includes a bottom plate portion 16 a disposed on the mounting surface T and a pair of supports provided upright on both sides of the bottom plate portion 16 a. And a piece 16b. The bottom plate portion 16a of the first support body 16 has a width corresponding to the lower surface of the leg portion 4 and has a strip plate shape that is long in the front-rear direction of the musical instrument case 1, and the leg portion 4 from the portion with respect to the notch portion 4a of the leg portion 4 It is formed to extend rearward. A plurality of rubber feet 16c are provided on the lower surface of the bottom plate portion 16a.

  As shown in FIGS. 3, 5 and 6, the pair of support pieces 16b are provided on both sides of the bottom plate portion 16a in correspondence with the cutout portions 4a of the leg portions 4, and the lower ends of the rear portions of the leg portions 4 are arranged on both sides. It is comprised so that the notch part 4a may be plugged up. The pair of support pieces 16b are provided with a pair of guide holes 18 that guide both end portions of the lock shaft 11 along the vertical direction. The pair of guide holes 18 are formed with a length that is substantially the same as or slightly shorter than the length of the rear end of the musical instrument case 1 moving in the vertical direction.

  Further, as shown in FIGS. 5 and 6B, the second support member 17 includes a fixed plate portion 17a fixed on the rear portion of the bottom plate portion 16a of the first support member 16, and the fixed plate portion 17a. A support plate portion 17b provided upright on one side (the left side in FIG. 6B), and a mounting plate portion 17c bent in parallel with the lock shaft 11 at the upper portion of the support plate portion 17b. Have. An attachment plate 19 for attaching the lock support mechanism portion 13 is provided on the attachment plate portion 17c.

  As shown in FIGS. 3, 5, and 6, the lock support mechanism portion 13 protrudes on the movement locus of the lock shaft 11 that moves in the vertical direction along the guide hole 18 so that the lock shaft 11 can be projected and retracted. 1 a support protrusion 20 that is supported on the upper portion of the guide hole 18 of the support 16, a spring member 21 that is an urging member that urges the support protrusion 20 toward the movement locus of the lock shaft 11, and a support protrusion The adjustment member 22 which adjusts the supporting force which the part 20 supports and locks the lock shaft 11 is provided.

  In this case, the mounting plate 19 is fixed to the mounting plate portion 17c of the second support 17 by welding as shown in FIGS. At the center of the mounting plate 19, a holding projection 19 a for holding one end (the right end in FIG. 5) of the spring member 21 is directed on the movement locus of the lock shaft 11 moving along the guide hole 18. Projecting.

  The spring member 21 is a coil spring as shown in FIGS. 3, 5 and 6, and the holding projection 19a of the mounting plate 19 is inserted into one end (the right end in FIG. 5). It is held by the holding projection 19a. The spring member 21 has a support projection 20 attached to the other end (left end in FIG. 5), and is configured to urge the support projection 20 toward the movement locus of the lock shaft 11. ing.

  As shown in FIGS. 3, 5, and 6, the support protrusion 20 is provided on a disc 20 a that is attached to the other end (the left end in FIG. 5) of the spring member 21, and the disc 20 a. And a protruding portion 20b. As a result, the support protrusion 20 is pushed by the spring force of the spring member 21 so that the tip of the protrusion 20b is pushed onto the movement locus of the lock shaft 11, and the lock shaft 11 is moved to the first support body by the protruded protrusion 20b. It is configured so as to be supported on top of the 16 guide holes 18.

  In this case, as shown in FIGS. 3 and 5, the protrusion 20b has a hemispherical tip. For this reason, when the protrusion 20b is pushed out on the movement locus of the lock shaft 11 by the spring member 21, the hemispherical tip abuts on the lower side of the outer peripheral surface of the round bar-shaped lock shaft 11, The lock shaft 11 is configured to be supported on the upper portion of the guide hole 18 with the arcs in contact with each other.

  Thereby, as shown in FIG. 3, the lock support mechanism 13 pushes up the rear end of the instrument case 1 in a normal state so that the lock shaft 11 is disposed above the guide hole 18 of the first support 16. In this state, the support protrusion 20 is configured to support the lock shaft 11. Further, as shown in FIG. 8, when the lock support mechanism portion 13 receives a certain level of vibration due to an earthquake or the like, that is, vibration with a load greater than the spring force of the spring member 21, the lock shaft 11 by the support projection 20. It is comprised so that support of may be removed.

  Further, as shown in FIGS. 3, 5, and 6, the adjustment member 22 of the lock support mechanism portion 13 is attached to the presser plate 23 that presses the spring member 21 and the presser plate 23 to the second support body 17. And a pair of adjusting screws 24 attached to the mounting plate 19. The presser plate 23 includes a presser portion 23a that presses the disc portion 20a of the support projection 20 toward the mounting plate 19, a pair of arm portions 23b that extend from the upper and lower ends of the presser portion 23a toward the mounting plate 19, and these The pair of arm portions 23 b has a pair of movable pieces 23 c provided in parallel to the mounting plate 19.

  In this case, as shown in FIGS. 3 and 5, a through hole 25 into which the protrusion 20 b of the support protrusion 20 is inserted is provided at the center of the presser 23 a. Each of the pair of movable pieces 23c is provided with a screw hole 26 into which the adjustment screw 24 is screwed. The mounting plate 19 is provided with a pair of insertion holes 27 into which the adjustment screws 24 are inserted, corresponding to the screw holes 26 of the pair of movable pieces 23c. The pair of adjustment screws 24 are configured to be inserted into the respective insertion holes 27 of the mounting plate 19 from the rear side thereof and screwed into the respective screw holes 26 of the pair of movable pieces 23c.

  Accordingly, as shown in FIGS. 3 and 5, the adjustment member 22 moves the presser plate 23 along the biasing direction of the spring member 21 by tightening or loosening the pair of adjustment screws 24. The protrusion length of the support protrusion 20 that protrudes within the movement locus of the lock shaft 11 is adjusted, and the support force of the lock shaft 11 by the support protrusion 20, that is, the resistance force against vibration caused by an earthquake or the like is adjusted. Yes.

  That is, as shown in FIGS. 3 and 5, when the adjustment member 22 is tightened with a pair of adjustment screws 24, the presser plate 23 moves toward the mounting plate 19 against the spring force of the spring member 21. By moving the support protrusion 20 in a direction away from the lock shaft 11, the support length of the support protrusion 20 with respect to the lock shaft 11 is shortened, and the resistance to vibration due to an earthquake or the like is reduced. .

  3 and 5, when the pair of adjusting screws 24 is loosened, the adjusting member 22 moves to the lock shaft 11 side by the spring force of the spring member 21, and the supporting protrusion By moving 20 to the lock shaft 11 side, the support length of the support protrusion 20 with respect to the lock shaft 11 is lengthened, and the resistance to vibration due to an earthquake or the like is increased.

Next, the operation of the keyboard instrument overturn prevention device 10 will be described.
When the fall prevention device 10 is installed on this keyboard instrument, first, the mounting bracket 14 is attached to the lower rear end portion of the notch portion 4a provided at the lower rear end portion of the leg portion 4 with the screws 15. In this state, the support member 12 is disposed below the rear end of the leg portion 4.

  At this time, the second support 17 is attached to the rear end portion of the bottom plate portion 16 a of the first support 16 in advance, and the lock support mechanism 13 is attached to the second support 17. That is, when the lock support mechanism portion 13 is attached to the second support member 17, one end portion of the spring member 21 is held by the holding protrusion 19 a provided on the attachment plate portion 17 c of the second support member 17. The support protrusion 20 is disposed at the other end of the member 21.

  In this state, the spring member 21 and the support protrusion 20 are pressed against the mounting plate 19 by the pressing plate 23 of the adjustment member 22. That is, the protrusion 20b of the support protrusion 20 is inserted into the through hole 25 provided in the retainer 23a of the retainer plate 23, and the retainer 23a is brought into contact with the disc 20a of the support protrusion 20, and this circle The plate portion 20 a and the spring member 21 are pressed against the mounting plate 19. In this state, the adjusting screw 24 is inserted into each insertion hole 27 of the mounting plate 19 from the rear side, and is screwed into each screw hole 26 of the pair of movable pieces 23 c of the presser plate 23.

  Then, the holding plate 23 is attached to the mounting plate 19 in a state where the disk portion 20 a and the spring member 21 are pressed against the mounting plate 19. Thereby, the lock support mechanism 13 is attached to the second support 17. When the second support 17 is mounted on the rear end portion of the bottom plate portion 16 a of the first support 16, the lock support mechanism portion 13 is arranged in a state of being inserted between the pair of support pieces 16 b of the first support 16. Is done.

  In this way, when the second support body 17 is attached to the first support body 16, the support member 12 is configured. The support member 12 is movable in the vertical direction to the lower rear end of the leg 4 while the lower rear end of the leg 4 is inserted between the pair of support pieces 16b of the first support 16. Be placed. In this state, the mounting holes 14c of the pair of mounting pieces 14b of the mounting bracket 14 attached to the leg 4 and the pair of guide holes 18 provided in the pair of support pieces 16b of the first support 16 Make it correspond.

  Then, the lock shaft 11 is inserted into the pair of guide holes 18 of the first support body 16 and the mounting holes 14c of the mounting bracket 14 attached to the leg portion 4, and both ends of the lock shaft 11 are connected to the pair of the mounting holes 14c. Projecting from the guide holes 18, the retaining member 11 a is attached to the end of the projecting lock shaft 11. As a result, the support member 12 is coupled to the lower rear end portion of the leg portion 4 by the lock shaft 11 so as to be movable in the vertical direction.

  In this state, when the lock shaft 11 is supported by the support protrusion 20 of the lock support mechanism 13, first, the adjustment screw 24 is tightened to compress the spring member 21, and the presser plate 23 is moved to the second support 17. To the mounting plate 19. As a result, the tip of the support protrusion 20 moves away from the movement locus of the lock shaft 11 that moves in the vertical direction along the guide hole 18.

  Then, the rear end portion of the musical instrument case 1 is lifted in a state where the support member 12 is disposed on the placement surface T such as a floor. Then, the rear end portion of the leg portion 4 is lifted, and the lock shaft 11 moves upward along the guide hole 18 of the first support body 16 so that the tip of the support projection portion 20 of the lock support mechanism portion 13 is moved. Move over it after passing.

  In this state, the adjustment screw 24 is loosened and the presser plate 23 is moved toward the lock shaft 11, and the tip of the support projection 20 protrudes on the movement locus of the lock shaft 11. The lock shaft 11 is supported by the protrusion 20b. Accordingly, the lower end of the leg portion 4 is supported by the support member 12 in a state where it floats above the placement surface T.

  In this state, by tightening or loosening the pair of adjusting screws 24, the holding plate 23 is moved along the urging direction of the spring member 21, and the support protrusion 20 protruding into the movement locus of the lock shaft 11. Is adjusted, and the support force of the lock shaft 11 by the support protrusion 20, that is, the support force against vibration caused by an earthquake or the like is finely adjusted, for example, adjusted to about 3 seismic intensity. Thereby, the fall prevention device 10 is installed at the lower end of the rear end of the leg portion 4 of the musical instrument case 1.

  At this time, each lower end portion of the pair of leg portions 4 is slightly inclined upward from the front end portion toward the rear end portion, so that the rear end lower portion of the leg portion 4 is floated above the placement surface T. Thus, when supported by the support member 12, the case main body 3 of the musical instrument case 1 is in a horizontal state, and accordingly, the keyboard portion 2 in the case main body 3 is in a horizontal state.

  In this way, the musical instrument case 1 with the fall prevention device 10 is placed near the wall, and the fall prevention device 10 is placed close to the wall. In this state, it is possible to perform by operating the keyboard unit 2 as a normal keyboard instrument. Further, in this state, when the instrument case 1 receives a vibration having a seismic intensity of about 3 due to an earthquake or the like, the lock shaft 11 provided at the lower end of the rear end of the leg 4 is detached from the support protrusion 20 of the lock support mechanism 13. The instrument case 1 tilts backward.

  That is, when the instrument case 1 receives a vibration having a seismic intensity of about 3, the support protrusion 20 of the lock support mechanism 13 that locks the lock shaft 11 and the lock shaft 11 vibrate, and the lock shaft 11 is caused by this mutual vibration. Moves the support protrusion 20 in the direction away from the movement locus of the lock shaft 11 against the spring force of the spring member 21, and the lock shaft 11 is disengaged from the protrusion 20 b of the support protrusion 20.

  Then, the lock shaft 11 moves from the upper part to the lower part along the guide hole 18 of the first support 16. Along with this, the rear end lower part of the leg 4 that has been lifted moves downward, and the instrument case 1 tilts backward. At this time, the lock shaft 11 comes into contact with the lower end portion of the guide hole 18 of the first support body 16, and the lower rear end portion of the leg portion 4 is supported with a slight gap between the mounting surface T such as the floor, The lower rear end portion of the leg portion 4 does not abut on the placement surface T.

  Further, at this time, since the second support body 17 is disposed behind the leg portion 4, the lower part of the rear end of the leg portion 4 does not abut against the placement surface T, and is slightly between the placement surface T and the second support body 17. Even if the first support 16 supports the lower rear end of the leg 4 with a small gap, the rear end of the leg 4 is pressed by the second support 17. Thereby, the instrument case 1 can be tilted rearward in a stable state, and the instrument case 1 can be prevented from falling in the front-rear direction.

  As described above, according to the fall prevention device 10 for a keyboard instrument, the lock shaft 11 provided at the lower end of the rear end of the musical instrument case 1 and the placement surface T on which the musical instrument case 1 is arranged are arranged and locked. A support member 12 having a guide hole 18 that guides the shaft 11 in the vertical direction, and attached to the support member 12, the lock shaft 11 is supported on the upper portion of the guide hole 18 with the rear end lower portion of the instrument case 1 pushed up. And a lock support mechanism portion 13 configured to disengage the supported lock shaft from the upper portion of the guide portion when a vibration of a set value or more is applied to the housing. As a result, the instrument case 1 can be prevented from falling due to vibration such as an earthquake, and the tipping prevention device 10 can be prevented from getting in the way.

  That is, in the keyboard instrument overturn prevention device 10, when the instrument case 1 is subjected to vibration such as an earthquake, the lock support mechanism portion 13 that locks the lock shaft 11 provided at the lower rear end of the instrument case 1. Thus, the lock on the lock shaft 11 can be released, so that the lower end of the rear end of the instrument case 1 can be lowered to tilt the instrument case 1 backward. Thereby, the fall of the instrument case 1 due to vibrations such as an earthquake can be prevented, and the fall prevention device 10 is not disturbed by installing the fall prevention device 10 at the lower rear end of the instrument case 1. can do.

  In this case, the support member 12 includes a first support 16 having a guide hole 18 and corresponding to the lower rear end of the musical instrument case 1, and a lock support mechanism 13, and a lower rear end of the first support 16. And a second support 17 that protrudes rearward from the musical instrument case 1, so that the lock support mechanism 13 attached to the second support 17 can lower the rear end of the musical instrument case 1. The provided lock shaft 11 can be supported on the upper part of the guide hole 18 of the first support 16, and thereby the instrument case 1 is reliably and satisfactorily supported while the rear end lower part of the instrument case 1 is pushed up. can do.

  Further, the support member 12 is configured so that the lock shaft 11 is lowered along the guide hole 18 of the first support body 16 when the lock support mechanism portion 13 is unlocked with respect to the lock shaft 11 due to vibration such as an earthquake. Since the lock shaft 11 contacts the lower end of the guide hole 18 of the first support 16, the lower end of the rear end of the musical instrument case 1 does not contact the mounting surface T such as the floor. The lower end of the musical instrument case 1 can be supported with a slight gap therebetween.

  At this time, since the second support member 17 is disposed so as to protrude rearward from the leg portion 4 of the musical instrument case 1, the lower end of the rear end of the musical instrument case 1 does not contact the placement surface T, and the first support member 17 has a slight gap. Even if the first support 16 supports the lower rear end portion of the musical instrument case 1, the second support 17 can hold the rear end of the musical instrument case 1, thereby tilting the musical instrument case 1 backward in a stable state. be able to.

  Further, in this overturn prevention device 10, the lock support mechanism portion 13 protrudes so as to be able to project and retract on the vertical movement trajectory of the lock shaft 11 and supports the lock shaft 11 on the upper portion of the guide hole 18, and By including the spring member 21 that urges the support protrusion 20 toward the movement locus of the lock shaft 11, the support protrusion 20 is brought onto the movement locus of the lock shaft 11 by the spring force of the spring member 21. The lock shaft 11 can be reliably supported on the upper portion of the guide hole 18 of the first support 16 by the extruded support protrusion 20.

  In this case, the lock support mechanism unit 13 includes the adjustment member 22 that adjusts the support force for supporting and locking the lock shaft 11, so that the adjustment member 22 can support the lock shaft 11 by the support protrusion 20. In other words, it is possible to adjust the resistance against vibration caused by an earthquake or the like to an optimum state.

  That is, the adjustment member 22 includes a holding plate 23 that holds the spring member 21 and a pair of adjustment screws 24 that attach the holding plate 23 to the second support member 17. By loosening or loosening, the support length of the support protrusion 20 that supports the lock shaft 11 can be easily finely adjusted, and the support force against vibration caused by an earthquake or the like can be adjusted to an optimum state.

  In the above-described embodiment, the case where the spring member 21 is used as the urging member of the lock support mechanism portion 13 is described. However, the spring member 21 is not necessarily used, and an elastic member such as rubber or elastomer is used. May be.

  Moreover, although the case where it applied to a keyboard musical instrument was described in embodiment mentioned above, it does not necessarily need to be a keyboard musical instrument, For example, it can apply also to furniture, such as a bowl.

As mentioned above, although one Embodiment of this invention was described, this invention is not restricted to this, 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 support having a lock shaft provided at a rear end portion of the housing, and a guide portion which is disposed on a mounting surface on which the housing is disposed and guides the lock shaft in the vertical direction. When the member is attached to the supporting member, the rear end of the casing is pushed up, the lock shaft is supported on the upper portion of the guide section, and the casing is subjected to a vibration greater than a set value. And a lock support mechanism configured to disengage the supported lock shaft from the upper portion of the guide unit.

  According to a second aspect of the present invention, in the overturn prevention device according to the first aspect, the support member is provided with the guide portion, and the first support body disposed below the rear portion of the housing, and the lock A fall prevention device, comprising: a second support body to which a support mechanism portion is attached and which is disposed in a state of projecting rearward from the rear end portion of the first support body to the housing.

  According to a third aspect of the present invention, in the overturn prevention device according to the first or second aspect, the lock support mechanism portion is on a movement locus of the lock shaft that moves in the vertical direction along the guide portion. A support protrusion that protrudes so as to protrude and support the lock shaft on an upper portion of the guide portion; and a biasing member that biases the support protrusion toward the movement locus of the lock shaft. The fall prevention device characterized by the above.

  According to a fourth aspect of the present invention, in the overturn prevention device according to any one of the first to third aspects, the lock support mechanism portion adjusts a support force for supporting and locking the lock shaft. It is a fall prevention device characterized by comprising.

  The invention according to claim 5 is a keyboard instrument comprising the overturn prevention device according to any one of claims 1 to 4.

DESCRIPTION OF SYMBOLS 1 Musical instrument case 4 Leg part 10 Fall prevention apparatus 11 Lock shaft 12 Support member 13 Lock support mechanism part 14 Mounting bracket 16 1st support body 17 2nd support body 18 Guide hole 19 Mounting plate 20 Support protrusion part 21 Spring member 22 Adjustment member

Claims (5)

On the rear side of the housing, a lock shaft provided with a shaft in a lateral direction ;
And a guide portion for guiding the previous Symbol lock shaft in a vertical direction,
Before Symbol a supporting protrusion and retractable projects being guided on a moving locus of the lock shaft that moves in the vertical direction for supporting the lock shaft by the guide portion, the support projections of the movement locus of the lock shaft And when the support protrusion supports the lock shaft, when the vibration more than a set value is applied to the housing, the support protrusion is A lock support mechanism part that is separated from the movement locus of the lock shaft and the lock shaft is guided downward by the guide part, so that the lock shaft is disposed below the support protrusion ;
A fall prevention device characterized by comprising: 2. The overturn prevention device according to claim 1, wherein the housing is in a horizontal state when the lock shaft is disposed above the support protrusion, and the lock shaft is disposed below the support protrusion. 3. The fall-preventing device according to claim 1 , wherein the casing is in a state of being tilted rearward when being moved . The fall prevention device according to claim 1 or 2, wherein the guide portion includes a guide hole, and one end of the lock shaft protrudes from the guide hole .   4. The overturn prevention device according to claim 1, wherein the lock support mechanism includes an adjustment member that adjusts a support force for supporting and locking the lock shaft. 5. Fall prevention device.   A keyboard instrument comprising the fall prevention device according to any one of claims 1 to 4.

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