JPS588834Y2 - lock - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lock, and in particular to a lock that locks the blue keyboard lid of a musical instrument such as a piano or organ so that the blue keyboard cover cannot be opened.

FIG. 1 is a sectional view of a main part of a conventional musical instrument side lock attached to a keyboard instrument, and FIG. 2 is a perspective view for explaining the conventional musical instrument side lock.

A conventional musical instrument side lock will be described below with reference to FIGS. 1 and 2.

In a keyboard instrument 1 such as a piano or an organ, a mouth frame 11 is fixed to the lower front side of a keyboard 12 by a pair of main plates 14 (only one main plate 14 is shown in FIG. 1).

When such a keyboard instrument 1 is not in use, a keyboard lid 13 is provided to cover the keyboard 12 to prevent the keyboard 12 from getting stuck or from being undesirably pressed.

Further, a lock 2 is attached to the mouth frame 11 so that the keyboard lid 13 cannot be opened unnecessarily.

As shown in FIG. 2, such a lock 2 has a muzzle 22 provided in the center of a rectangular lock body 21.

When the key 23 is inserted into the muzzle and turned clockwise, the L fitting 24 protrudes from the top of the lock body 21 into the hole 27 of the receiving fitting 26 attached to the keyboard lid 13.

Further, when the key 23 is turned, the L fitting 24 moves in the direction shown by the arrow in FIG. 2, and is engaged with the receiving fitting 26, thereby locking the lock 2.

Since the lock body 21 of such a lock 2 has a square shape, when attaching it to the mouth frame 11, use a square hole (not shown).
must be drilled.

Further, when attaching the receiving metal fitting 26 to the keyboard lid 13, it is necessary to drill a shallow rectangular hole so that the receiving metal fitting 26 does not protrude from the surface of the keyboard lid 13 that contacts the mouth frame 11.

However, machining a rectangular hole is difficult and requires a large number of man-hours, resulting in high costs.

Therefore, the main purpose of this invention is to provide a lock with a simple structure that allows easy machining of mounting holes, thereby reducing the number of machining steps.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

FIG. 3 is a partially longitudinal cross-sectional side view showing a lock according to an embodiment of this invention.

An embodiment of this invention will be described in detail below with reference to FIG.

The multi-thread nut 31 has a cylindrical shape, and is formed to have a ring-shaped collar portion 311 as a locking member at one end thereof.

A multi-thread nut 31 is attached to the brim portion 311 of the keyboard lid 13.
Through hole 3 for mounting with wood screws (not shown) etc.
12 are drilled.

Furthermore, a multi-thread internal thread 313 is spirally formed on the inner circumferential surface of the multi-thread nut 31.

A multi-thread bolt 32 is provided to be screwed into the multi-thread nut 31.

The multi-thread bolt 32 has a cylindrical shape with an outer diameter slightly smaller than the outer diameter of the multi-thread nut 31, and is formed to have a ring-shaped collar portion 321 at one end thereof.

The outer peripheral surface of the multi-thread bolt 32 has a multi-thread male thread 322 that can be screwed into the female thread 313 of the multi-thread nut 31.
is formed.

Furthermore, a polygonal hole 323 is bored along the central axis of the multi-thread bolt 32.

A locking member 33 having a collar 331 is provided to lock the collar 321 of the multi-thread bolt 32 .

This locking member 33 has a hole 332 with an inner diameter slightly larger than the outer diameter of the multi-thread bolt 32.

The ring-shaped magnet 34 is for attracting the multi-thread bolt 32, and has a through hole 341 along its central axis through which a shaft 351 of a key 35 (described later) passes.

The key 35 is for rotating the multi-thread bolt 32, and the tip 352 of the shaft 351 is shaped to fit into a polygonal hole 323 drilled in the multi-thread bolt 32. be done.

Note that the magnet 34 can be used to attach the lock 3 horizontally,
Or, with the multi-thread bolt 32 on the upper side, tighten the multi-thread nut 31.
This can effectively prevent the multi-thread bolt 32 from moving undesirably and being screwed into the multi-thread nut 31 when the lock is opened.

FIG. 4 is a cross-sectional view of the main part showing the state in which the lock of one embodiment of this invention is attached to a keyboard instrument as a musical instrument lock. In particular, FIG. 4a shows the unlocked state, and FIG. indicates a locked state.

Hereinafter, with reference to FIGS. 3 and 4, a case will be described in which a musical instrument lock 3 according to an embodiment of the present invention is attached to a keyboard instrument and is unlocked and locked.

A multi-thread nut 3 is attached to the surface where the keyboard lid 13 contacts the mouth frame 11.
1, a hole 131 with an inner diameter slightly larger than the outer diameter of the multi-thread nut 31 is bored, and a relatively shallow hole 132 into which the collar 311 can fit is also bored.

Then, insert the multi-thread nut 31 into the hole 131,
The collar portion 311 is fitted into the hole 132.

Then, insert a wood screw into the through hole 312 of the collar portion 311, screw this wood screw together, and attach the multi-lead nut 31 to the keyboard lid 1.
Install it on 3.

On the other hand, from the upper surface of the mouth frame 11, the flange-shaped portion 33 of the locking member 33
A relatively shallow hole 111 into which the magnet 1 is fitted is bored, and the hole 1 has an inner diameter approximately equal to the diameter of the magnet 34 along its central axis.
12 is drilled.

Furthermore, a key 35 is inserted downward along the central axis of this hole 112.
The through hole 11 has an inner diameter slightly larger than the outer diameter of the shaft 351.
Drill 3.

Then, the magnet 34 is inserted into the hole 112 and fitted to the bottom thereof.

The multi-thread bolt 32 is inserted from above with the collar portion 321 facing downward.

Further, the flange-shaped portion 331 of the locking member 33 is fitted into the hole 111.

Then, a wood screw is inserted into the through hole 333 and screwed together with a screwdriver to attach the locking member 33 to the mouth frame 11.

In this way, when locking the lock 3 attached to the keyboard lid 13 and the mouth frame, the hole 1 drilled in the lower part of the mouth frame 11
Insert the key 35 through the opening of 13 and press the tip 352
is passed through the through hole 341 of the magnet 34, and the multi-lead bolt 3
2 into the hole 323.

Then, push up the multi-thread bolt 32 and turn it clockwise.

Thereby, the multi-thread threaded bolt 32 has its male threaded portion 32
2 is screwed into the female threaded portion 313 of the multi-thread nut 31 and pushed upward.

As the key 35 continues to be turned, the collar 321 of the multi-thread bolt 32 is locked by the locking member 33, and the key 3 is no longer locked.
5 will no longer turn.

Therefore, the keyboard lid 13 cannot be opened because the multi-thread nut 31 is screwed onto the multi-thread bolt 32 and the collar portion 321 of the multi-thread bolt 32 is locked by the locking member 33. become unable to do so.

Also, when unlocking, fit the key 35 into the hole of the multi-thread bolt 32 in the same way as when locking, and turn the key 35 in the opposite direction to the direction in which it was turned when locking. .

As a result, the male threaded portion 322 of the multi-thread bolt 32 and the female threaded portion 313 of the multi-thread nut 31 are unscrewed, and the multi-thread bolt 32 is attracted to the magnet 34.

Therefore, the keyboard lid 13 can be opened and closed with respect to the mouth frame 11.

In this way, the lock according to this embodiment has a multi-thread screw nut 31.
．． Multi-thread threaded bolt 32. Since the outer shape of each of the magnets 34 is circular, the holes for attaching them to the keyboard lid 13 and the mouth frame 11 may be easily machined round holes.

Furthermore, since the locking member 33 also functions as a decorative eyelet for the hole on the upper surface of the mouth frame 11, the appearance is also favorable.

In the above embodiment, a hole is drilled in the mouth frame and the magnet and the multi-thread bolt are inserted directly into the hole, but the magnet and the multi-thread bolt can be inserted using a metal material or the like. A cylindrical member may be formed.

In this case, the cylindrical member is formed into a relatively long column extending from the upper surface to the lower part of the mouth frame, and a through hole into which the key is inserted is integrally formed.

Thereby, the number of man-hours required for forming holes in the mouth frame can be further reduced.

Furthermore, in the above-mentioned embodiment, the locking member was fixed to the mouth frame by providing a through hole in the brim-shaped part of the locking member, inserting a wood screw into the through-hole, and screwing it together with a screwdriver. A pawl may be provided along the outer periphery, and the locking member may be driven into place with a hammer or the like and fixed.

In this case, since no wood screws or the like are used, the appearance is more preferable.

As described above, according to this invention, since the lock is constituted by the multi-thread nut, the multi-thread bolt, the locking member, and the magnet, the multi-thread nut, the multi-thread bolt, , it is only necessary to process holes for accommodating the locking member and the magnet, and the number of processing steps can be reduced and a lock with a simple structure can be obtained.

In addition, since a magnet is provided on the collar side of the multi-thread bolt, when the key is turned to the other side and the multi-thread bolt is unscrewed from the multi-thread bolt, the multi-thread thread bolt is removed. The bolt is attracted by the magnet, the multi-thread bolt does not move undesirably, and the key can be easily inserted into the keyhole of the multi-thread bolt when the lock is to be locked again next time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a keyboard lid of a keyboard instrument to which a conventional instrument side lock is attached. FIG. 2 is a perspective view for explaining a conventional musical instrument side lock. FIG. 3 is a partially longitudinal cross-sectional side view showing a lock according to an embodiment of this invention. FIG. 4 is a cross-sectional view of the main part showing a state in which the lock of one embodiment of this invention is attached to a keyboard instrument as a musical instrument side lock, and FIG.
4 shows the unlocked state, and FIG. 4 shows the locked state. In the figure, 31 is a multi-thread nut, 32 is a multi-thread bolt, 33 is a locking member, 34 is a magnet, and 35 is a key.

Claims (2)

[Scope of utility model registration request] (1) A multi-thread nut having a multi-thread internal thread formed on the inner peripheral surface of the cylinder, a collar-shaped locking member formed at one end of the cylinder, and the multi-thread thread nut formed on the outer peripheral surface of the cylinder. A multi-thread screw bolt is formed with a multi-thread male thread that can be screwed into a screw nut, and further has a keyhole drilled in the bottom side of the flange-shaped portion, and at least the multi-thread screw bolt is formed from the bottom surface of the locking member side of the multi-thread screw bolt. a ring-shaped locking member that is arranged at a distance from the multi-thread bolt and engages with a collar of the locking member of the multi-thread bolt, and a collar-shaped side of the multi-thread bolt; is provided with a hole in the center thereof that can communicate with the multi-thread bolt, and includes a magnet that attracts the bottom surface of the locking member of the multi-thread bolt when the lock is unlocked; Insert the key into the keyhole of the multi-thread bolt through the screw and turn it to one side, thereby threading and locking the multi-thread bolt into the multi-thread nut, and lock the front/deployment to the other side. The lock is unlocked by unscrewing the multi-thread bolt and the multi-thread nut by turning it to the side, and by attracting the multi-thread bolt to the magnet. , tablets. (2) Utility model registration claim 1, characterized in that the multi-strip nut is fixed to a keyboard lid of a keyboard instrument, and the multi-strip bolt is fixed to a main body of the keyboard instrument. Lock as described in section.