JPH0727511Y2 - Waterproof music box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a waterproof music box in which a music box is housed in an airtight case.

[Prior art]

As shown in FIG. 6, a conventional waterproof music box has a recess 16a in a plate 16 that overlaps the frame 10 of the music box 1, and an O-ring 17 is inserted in the recess 16a. The O-ring covers the outer circumference of the hoisting shaft 4. It was waterproof by tightening it.

In the above structure, since the hoisting shaft is tightened by the O-ring, when the whole dance is unwound and the unwinding torque becomes weaker, the sliding contact resistance with the O-ring reduces the number of times of rewinding or variation, and shortens the ringing time. There are drawbacks such as being done.

If the center of the hoisting shaft shifts when the music box is attached to the case or when the hoisting shaft is wound up,
There is a drawback in that the tightening force for tightening the ring becomes uneven and the sealing performance deteriorates.

Also, if the sealing performance deteriorates, children can use it in the bath,
When it is used for water play in summer etc., there are many opportunities for temperature change, and there is a drawback that the water suction effect occurs in the case due to increase and decrease in air volume due to temperature change, and the waterproof function deteriorates.

[Purpose of device]

In view of the above drawbacks, the present invention uses a packing having a shape different from that of the O-ring so that the rewinding torque of the hoisting shaft is not reduced by the packing and secures the number of rewinding times and the ringing time.
It is to propose a waterproof music box with reduced variation in sealing performance.

[Constitution of device]

The present invention provides a waterproof music box in which a music box is surrounded by a fixing plate for supporting a frame and a case, and the frame and a hoisting shaft protruding from the plate are sealed between the plate and the frame. The through-hole of the hoisting shaft has a larger diameter than the through-hole of the hoisting shaft provided in the frame, and an annular step is formed in this large-diameter through hole so that the frame side has a larger diameter, and the outer circumference is formed on this step. This is because a flat plate ring-shaped packing, which is attached to the outer circumference of the hoisting shaft and the inner circumference of the through hole, is fitted between the music box and the plate and sealed with this packing.

〔Example〕

The present invention will be described below with reference to the illustrated embodiments. The waterproof music box is a plate 2 that supports the frame 10 of the music box 1 in FIG.
The case 3 is welded and fixed on the above by ultrasonic welding or the like.
The plate 2 has a through hole 2a having a larger diameter than the through hole provided in the frame through which the hoisting shaft 4 of the music box 1 passes.
Has been drilled. An annular stepped portion 2b is formed on the frame 10 side of the through hole 2a, and a flat plate annular packing 5 made of an elastic material such as rubber is fitted in the through hole 2a, so that the music box 1 is supported between the plates 2 supporting the frame 10. It is fitted and sealed.

As shown in FIGS. 1 and 2, the flat plate ring-shaped packing 5 has a center portion and an outer circumference portion each having an outer portion 5a and an inner portion 5b formed by a curved portion, an intermediate portion 5c formed by a flat plate, and an outer portion at the intermediate portion 5c. The part 5a and the inner part 5b are connected.

An outer side portion 5a of the flat plate annular packing 5 fitted in the through hole 2a is closely attached to the inner circumference of the through hole 2a. The middle part 5c is the frame 10
Is applied to.

A cord winding pulley 6 around which a cord 11 is wound is screwed onto the male screw 4a at the lower end of the winding shaft 4. A cover 7 is welded to the lower side of the plate 2.

The case 3 has a concave upper side and a curved portion 3a on the upper side of the drum 12 of the music box 1 and a vibration plate 13 of the music box on the lower side of the music box 1 as long as the sounding function of the music box 1 is not hindered.
3b is formed so that the volume inside the case 3 is small.

The hoisting shaft 4 in the barrel 14 fixed on the frame 10 is wound with a complete dance (not shown).

In the operation of the music box 1, when the string 11 is pulled out, the string winding pulley 6 is rotated and the whole dance is wound up.

The drum 12 is speed-controlled by the speed governor and rotated by this all-drive source, and the pin of the drum 12 plays the vibrating plate 13 to play the music box 1.

When the waterproof music box is constructed as described above, the hoisting shaft 4
Rotate to wind up the whole dance, unwind the whole dance, and wind the hoisting shaft 4
When the coil is rewound, the flat ring packing 5 has an inner portion 5b and an outer portion.
Since the inner part 5b and the outer part 5a are separated by connecting the middle part 5c to each other, the force applied to the hoisting shaft 4 is only the force generated in the inner part 5b, unlike the O-ring. The influence on the number of times the shaft 4 is rewound is very small, and the ringing time is not shortened.

Further, even when the music box 1 is attached to the plate 2 or the center of the flat plate annular packing 5 is deviated when the hoisting shaft 4 is wound up, the waterproof performance is little affected.

In addition, a flat ring packing 5 is used from the outside by a child to use in a bath etc.
When water pressure is applied to the inner circumference of the through hole 2a and the outer portion 5a and the outer circumference of the hoisting shaft 4 and the inner portion 5b, the sealing effect does not change because the deformation and the close contact are made according to the water pressure. The function is improved, the waterproof is surely secured, and the quality is stabilized. Furthermore, since the flat plate annular packing 5 is used, it is possible to reduce variations in waterproof performance in mass production and improve reliability.

When the temperature further changes from a low temperature to a high temperature, the air in the case 3 expands, and a force is generated in the flat ring packing 5 from the inside of the case 3 to the outside. Therefore, a force in the direction A is applied to the outer side portion 5a to push the flat plate annular packing 5 outward, but since the lower end outer periphery 5d of the outer portion 5a is placed on the annular stepped portion 2b, the outer peripheral portion 5a is held there and comes off. There is no. Further, due to the action of the annular step portion 2b, the air in the case 3 does not leak to the outside at a pressure within a certain fixed limit, so that the pressure when returning to the original condition is maintained at a constant 1 atmospheric pressure.

Further, if the volume in the case 3 is small, the increase or decrease in the air volume due to temperature change is small, so that the suction effect of water does not occur, and the deterioration of the waterproof function due to the expansion and contraction of air due to the temperature change is prevented,
Water does not enter the case 3 even if the child uses it in the bath or in the water in summer.

3 to 5, since the inner portion 5b and the outer portion 5a of the flat annular packing 5 are separated from each other, a space is provided around the hoisting shaft 4, and therefore the stopper member 8 is provided by utilizing this space. This is an application example in which the winding key 9 is prevented from coming off and used as a safety key.

In FIG. 3 and FIG. 4, a retaining portion consisting of an inward flange portion on the lower side of an annular step portion 2b formed with a diameter larger than the diameter of the through hole of the frame of the plate 2 supporting the frame 10 of the music box 1 An outer peripheral flange portion 8a of the stopper member 8 is placed on 2c.

The stopper member 8 has a cylindrical portion 8b and a recessed portion 8c on the upper portion of the collar portion 8a.
And a hollow portion 8d into which the cylindrical portion 9a of the winding key 9 is fitted, a plurality of elastic arm portions 8e on the lower side, and inwardly directed claws 8f on the lower ends of the elastic arm portions.
Are formed respectively.

The winding key 9 has a tubular portion 9a and an outer peripheral groove 9b having a diameter smaller than the outer diameter of the tubular portion.
A hollow portion 9c into which the large diameter portion of the hoisting shaft 4 fits and a female screw 9d screwed into the male screw 4a are formed inside the cylindrical portion 9a.

A flat plate annular packing is fitted around the outer periphery of the hoisting shaft 4 as in FIG. 1, and a washer 15 is fitted on the hoisting shaft 4 in the recess 8c of the stopper member 8.

When the winding key 9 is screwed onto the winding shaft 4 in the above application example, the tubular portion 9a of the winding key 9 is inserted so as to widen the claw 8f of the stopper member 8 in the outer peripheral direction, and the claw 8f is inserted into the outer peripheral groove 9b. Are fitted as shown in FIG.

When the winding key 9 is rotated in the screwing direction, the male screw 4a and the female screw 9d are screwed into each other, and the state shown in FIG. 3 is obtained.

When the claw 8f is fitted in the outer peripheral groove 9b as shown in FIG. 5 above, even if the infant tries to remove the winding key 9 from the state shown in FIG. When the winding key 9 comes off, it becomes a safety key that prevents the risk of an infant putting the winding key in his mouth.

Further, when the winding key is impacted by dropping the waterproof music box in the state shown in FIG. 3, the winding key 9 and the hoisting shaft 4 are moved upward, but the washer 15 and the flat plate annular packing are placed above the cylindrical portion 9a. 5 has an intermediate portion 5c, and the intermediate portion 5c is applied to the frame 10. Therefore, since the shock is received by the frame 10 and the hoisting shaft 4 has a small movement amount, the barrel barrel 14 is slightly deformed and damaged. Is prevented.

[Effect of device]

Since the present invention is configured as described above, the influence on the number of times the winding shaft is rewound is very small, and the ringing time is not shortened. Furthermore, even if the center of the flat ring packing is displaced when the music box is attached to the plate or when the hoisting shaft is wound up, the waterproof performance is not significantly affected. Also, even if a child uses it in a bath or the like and water pressure is applied to the flat ring packing from the outside, pressure is applied to the outer and inner parts of the flat ring packing, resulting in deformation according to the water pressure and close contact with the through hole and the hoisting shaft. Therefore, the sealing effect does not change, and the waterproof function is improved to ensure waterproofing, and the quality can be stabilized. Furthermore, since the flat packing is used, it is possible to improve the reliability by reducing the variation in waterproof performance in mass production. Further, when the temperature changes from a low temperature to a high temperature, the air in the case expands and tries to push out the flat plate annular packing to the outside, but it is held by the annular step portion and does not come off. Furthermore, since the air inside the case does not leak to the outside due to the action of the annular step at a pressure within a certain fixed limit, the pressure when returning to the original condition is kept at a constant 1 atmospheric pressure, and the child can take a bath. It is possible to provide a waterproof music box which is excellent in practical use such that water does not enter the case even if it is used or played in the water in summer and the like.

[Brief description of drawings]

An embodiment of the present invention is shown in the drawings, FIG. 1 is a sectional side view of a main part of a waterproof music box, FIG. 2 is a perspective view of a flat ring packing, and FIGS. 3 to 5 are application examples, and FIG. Is a cross-sectional side view of an essential part of an application example, FIG. 4 is a cross-sectional side view of an essential part of FIG.
FIG. 5 is a sectional side view of an essential part of an application example in which a winding key is prevented from coming off, and FIG. 6 is a sectional side view of an essential part of a conventional waterproof music box. 1 ... Music box, 2 ... Plate that supports the frame, 2a ...
… Through hole, 2b… Case, 4… Winding shaft, 5… Flat ring packing, 5d… Outer circumference, 10… Frame

Claims (1)

[Scope of utility model registration request] 1. A music plate (1) is surrounded by a fixing plate (2) for supporting a frame and a case (3), and a hoisting shaft (4) projecting from the frame and the plate (2) is attached to the plate (1). In the waterproof music box sealed between 2) and the frame (10), the through hole of the hoisting shaft provided in the plate (2) has a larger diameter than the through hole of the hoisting shaft provided in the frame. An annular step is formed in the through hole with a large diameter so that the frame side becomes larger, and the outer circumference is applied to this step and a flat plate annular packing that is in close contact with the outer circumference of the hoisting shaft and the inner circumference of the through hole is provided between the music box and the plate. A water-tight music box that was fitted to the and sealed with this packing.