JPH0316618Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a washable electric shaver.

[Conventional technology]

Washable electric shavers have been introduced in recent years, and their main case is formed into a cylindrical shape for waterproofing, and the opening at the axial end of the case is closed with a bottom cover with a waterproof gasket in between. It's summery. However, in such a cylindrical main body case,
It is extremely troublesome to incorporate built-in components such as motors, switches, and storage batteries into the interior.

Therefore, the inventor of the present invention formed the main body case into a pair of front and rear split cases like a normal dry electric shaver that cannot be washed with water, connected them with screws, and inserted waterproof gaskets between the annular mating parts of the split cases. After wearing it, I came up with the idea of using it as a case.

By the way, in the main body case of a conventional dry-type electric shaver, a screw is inserted from one of the front split case and the rear split case, and this screw is screwed into the screw receiving boss provided integrally in the other case. It is formed by connecting both divided cases. Conventionally, when the divided cases are put together, their mating parts touch each other, and the area around the through hole through which the screw passes, that is, between the seat part where the head of the screw comes into contact and the facing surface of the screw receiving boss, is A gap of considerable size is formed as a tightening margin,
The screw is tightened within the range of this gap, and this tightening brings the mating parts into close contact with each other.

[Problem that the invention attempts to solve]

Therefore, when retaining the connecting structure of the split cases of conventional dry-type electric shavers and inserting waterproof gaskets between the mating parts of these split cases, the tightening allowance of the screws based on the above-mentioned gap must be adjusted. It has been found that as a result, the waterproof packing is abnormally compressed, and the repulsive force of each part of the waterproof packing becomes large and tends to become uneven in each part. For this reason, a gap is created between the mating parts of the divided case, which impairs the appearance and waterproofness, making it unsuitable as a washable main body case. Further, since a large repulsive force acts on the screw receiving boss, the wall thickness must be increased in order to increase the strength of this boss, which becomes a cause of increased cost and weight.

An object of the present invention is to provide an electric shaver that can improve the waterproofness of the main body case and is easy to assemble.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a main body case formed by connecting a pair of front and rear vertically divided cases with screws, and forms an annular shape between the annular mating parts of each of the above divided cases. One of the mating parts has an inner fitting ridge located facing the inside of the main body case, and the waterproof packing is attached to the outer peripheral surface of the ridge by its own elastic force. The other mating part has an outer fitting protrusion located facing the outside of the main body case, and the inner circumferential surface of this protrusion in contact with the outer surface of the waterproof packing is connected to the inner fitting protrusion. The waterproof packing has an inclined outer surface and a cross section that tapers toward the mating part having the outer fitting protrusion. A seat portion having a screw hole through which the screw passes through is provided protrudingly on the inner surface of one of the split cases, and a screw receiving boss is protrusively provided on the inner surface of the other split case, and these seats and the screw receiving boss are formed in such a size that when the pair of front and rear divided cases are brought together without providing the waterproof gasket between these mating parts, their tips come into contact with each other, and the waterproof gasket is When this packing is placed between the mating parts of the pair of front and rear split cases and the screws are not tightened, the mating parts are spaced apart from each other, and the seat part and the screw receiving boss are separated from each other. The size is such that a slight gap is formed between the tips of each of the screws, which is eliminated by tightening the screw.

[Effect]

According to this water-washable electric shaver, the main body case is formed by connecting a pair of front and rear split cases, so the built-in parts can be assembled into the main body case with the main body case open. After that, the divided cases can be connected to each other using waterproof gaskets. Furthermore, the waterproof packing can be attached by wrapping it around the outer circumferential surface of the inner fitting protrusion of the mating part of one of the divided cases by utilizing its elastic force, so that when connecting the front and rear pair of divided cases, these parts can be attached. An annular waterproof gasket formed to correspond to the shape of the annular mating portion can be temporarily fixed. Furthermore, the inner circumferential surface of the outer fitting protrusion of the mating part of the other split case is inclined so as to open outward with respect to the inner fitting protrusion, and the outer surface of the waterproof packing is also inclined. Since the cross-sectional shape of this gasket is tapered toward the mating portion having the outer fitting protrusion, the waterproof gasket is wrapped around the inner fitting protrusion when the split cases are brought together. However, it can be prevented from being rolled up outward by the outer fitting protrusion, and therefore the two divided cases can be easily fitted together. Therefore, assembly is easy. and,
When assembling, when the waterproof packing is set between the split cases and the split cases are aligned, the seats and screw receiving bosses of the split cases will face each other with a slight gap, but when the screws are tightened, the screw heads will As soon as it hits the seat, the gap disappears and the split cases are connected. In other words, the tightening allowance for conventional screws is virtually non-existent, and the waterproof packing can be compressed with the necessary and sufficient force at the same time as the split cases are connected. Since the two divided cases are not brought close to each other, it is possible to prevent excessive clamping force from being applied to the waterproof packing. As a result, the waterproof packing is compressed with moderate force, so the waterproof packing does not escape to the outside.
Due to the above-mentioned compression between the mating parts of the split case, the waterproof packing is pressed against each inner surface of the square hollow part formed by the mating part and its inner and outer fitting protrusions, and furthermore, due to the above-mentioned roll-up prevention effect, the waterproof packing Since there is no gap between the mating parts due to being sandwiched in the rolled-up state, the main body case is ensured to be waterproof, and the strength of the screw receiving boss can be reduced.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, 1 is a main body case formed by connecting a pair of front and rear split cases 2 and 3 made of synthetic resin. As illustrated in FIG. 1, this main body case 1 is formed of a horizontally oriented shaving section 4 at the top and a grip section 5 at the bottom.

Each mating part 2a, 3a of the divided cases 2, 3 is annular, and as shown in FIGS. The other mating portion 3a has a protruding edge 2b, and the other mating portion 3a has an inner fitting protrusion 3b positioned facing the inside of the main body case 1, facing the inner surface of the protruding edge 2b. The inner circumferential surface of the outer fitting protrusion 2b is inclined so as to open outward relative to the inner fitting protrusion 3b, as shown in FIGS. 2 and 3. A ring-shaped waterproof packing 6 made of synthetic rubber is sandwiched between the mating parts 2a and 3a. This packing 6 has a cross section that tapers toward the mating portion 2a having the outer fitting protrusion 2b, and therefore the outer surface of the packing 6 is sloped.

The vertically divided divided cases 2 and 3 are connected to each other by upper and lower screw receiving bosses 7 and 8 integrally protruding from the inner surface of one of the divided cases, for example, the divided case 2.
This is accomplished by screwing screws 9 and 10 through the split case 3, respectively. The inner surface of the split case 3 has screw holes 11, 1 corresponding to the bosses 7, 8.
Seat portions 13 and 14 having a diameter of 2 are integrally provided in a protruding manner. Both of these seats 13 and 14 have screws 9 and 1
In this embodiment, the screw head is formed of the bottom wall of a recess provided to support the head of the screw 0 and to prevent the screw head from protruding from the outer surface of the split case 3. Further, as shown in FIG. 3, these screw receiving bosses 7 and seats 13, and screw receiving bosses 8 and seats 14 are connected to each other when the split cases 2 and 3 are put together without sandwiching the waterproof gasket 6. It is formed in a size that allows it to be brought into contact. Further, the waterproof gasket 6 is attached to the mating portion 2 of the pair of front and rear divided cases 2 and 3.
a, 3a, and when the screws 9, 10 are not tightened, there is a slight gap G between the respective tips of the seats 13, 14 and the screw receiving bosses 7, 8, which is eliminated by tightening the screws 9, 10. , and has a thickness that allows the mating portions 2a, 3a to be separated from each other by, for example, the gap G mentioned above. In FIG. 1, reference numeral 15 indicates a locking pawl, and reference numeral 16 indicates waterproof gaskets for the screw portions, which are clamped onto the tightening portions of the screws 9 and 10, respectively.

The shaving unit 4 has a built-in motor 17 sandwiched between the split cases 2 and 3, and
An inner cutter body 19 is detachably attached to the rotating shaft 18 of the motor 17, and an outer cutter body 20 is detachably attached to the upper part of the split case 2. Incidentally, reference numeral 21 in FIG. 1 is a motor section waterproof gasket provided in the penetrating portion of the rotating shaft 18.

In addition, the upper part of the split case 2 is provided with a discharge port 23 that connects to the space 22 formed between the case 2 and the outer cutter body 20, and a discharge port lid that can open and close the discharge port 23. 24 are provided. Therefore, to wash with water, open the discharge port cover 24 and place the outer cutter body 20 in a position such that the outer cutter faces upward, and then pour water from the direction of the arrow in FIG. 1 through the space 22. What is necessary is to discharge it from the discharge port 23 along with the hair scraps.

Further, a PC board 25 is housed in the grip portion 5. This PC board 25 contains a storage battery 26 and a main part 27 of, for example, a push-button switch, as well as a normally open switch 2 that opens the motor drive circuit during charging.
8 etc. is installed. Furthermore, the grip portion 5 has a convex portion 29a that sandwiches the storage battery 26, and
A PC board support 29 made of synthetic resin that supports the PC board 25 is built in between these convex portions 29a. This support 29 is positioned by engagement with a locking portion (not shown) provided on the inner surface of the split case 2, and the assembly of the PC board 25 and the PC board support 29 is assembled with the screws 9 , 10, it is sandwiched between the split cases 2 and 3. Further, numeral 30 in FIG. 1 is an operating section of the switch attached to the divided case 2 opposite to the main section 27 of the switch. The knob 30a of the operating section 30 is moved slightly upward in FIG.
- It can be turned off, and its return is done by a spring 31. In addition, 30c is a flexible deformable part of the operator 30b, and the knob part 30a is always connected to the divided case 2.
is biased in the direction of engagement with the surface of the Also,
32 is a gas vent valve biased by a spring 31; 33 is a switch part waterproof gasket that allows movement of the operating part 30 and waterproofs this part;
This is clamped to the inner surface of the divided case 2 by the extending portion 29b of the PC board support 29 mentioned above.

Further, reference numeral 34 in FIG. 1 is a charging terminal pin, which is set and integrally inserted into the molding die when the split case 2 is molded. This has the advantage of omitting troublesome assembly operations such as gluing and screwing, and eliminating the possibility of waterproofing failure due to poor adhesion or screwing. Also, 35 in Figure 1
is an operating pin that is movable in the axial direction and operates the movable contact piece of the switch 28; 36 is an O-ring for waterproofing;
37 is an operating pin pressing spring.

To assemble the rotary electric shaver with the above configuration, first, attach the outlet cover 24 to the split case 2.
is attached, and the waterproof gasket 21 and operating pin 35 with O-ring 36 are respectively fitted in predetermined positions, and the operation part 30 of the switch is
is attached, and the waterproof gasket 33 is positioned on the inner surface of the split case 2 so as to cover the operator 30b. Next, the gas vent valve 32 and the spring 31 are fitted into the central concave portion of the waterproof gasket 21.

On the other hand, the PC board 25, on which the storage battery 26 and the main part 27 of the switch are attached in advance, is placed on the PC board support 29.
Prepare a unit installed between the convex portions 29a of
This is assembled inside the split case 2 in the above state with the PC board support 29 facing downward. At the same time, the rotation shaft 18 of the motor 17 is connected to the waterproof gasket 21.
It is assembled into the divided case 2 so as to pass through the casing.
After that, the waterproof gasket 6 is attached to the inner fitting edge 3b at the mating portion 3a of the split case 3 using its own elastic force.
After temporarily fixing the waterproof gasket 6, attach this split case 3 to the split case 2.
and fit the mating parts 2a and 3a of each case 2 and 3 together. At this time, the inner circumferential surface of the outer fitting protrusion 2b is inclined so as to open outward with respect to the inner fitting protrusion 3b, and the outer surface of the waterproof packing 6 is also inclined. Since the cross-sectional shape of the packing 6 is tapered toward the mating portion 2 having the outer fitting protrusion 2b, the split case 2,
When the three comrades are brought together, the waterproof packing 6 wrapped around the inner fitting protrusion 3b is attached to the outer fitting protrusion 2.
b can prevent it from being rolled up outward. Therefore, both the divided cases 2 and 3 can be easily combined.

In this combined state, the waterproof gasket 6 is in a natural state and is not compressed, so the divided case 3 is separated by a dimension equal to the planned compression amount of the waterproof gasket 6 from the divided case 2, as shown by the two-dot chain line in FIG. A slight distance from the split case 2, between the mating parts 2a and 3a of both the split cases 2 and 3, and between the screw receiving bosses 7 and 8 and the seats 13 and 14, respectively, by a slight amount corresponding to the above compression distance. A gap G is formed.

Finally, a waterproof gasket 16 is provided on the outer surface of the seat portions 13 and 14, and the screws 9 and 10 are respectively inserted through the gasket 16 and the screw through holes 11 and 12, and the screw receiving bosses 6 and 7 are inserted. Screw them together. By this tightening, each mating part 2a, 3a is brought into contact and the waterproof gasket 6 is clamped with a predetermined force, and at the same time, the screw receiving bosses 7, 8 and seats 13, 14 are also brought into contact, so from this point onwards. Regardless of the tightening, no tightening force is applied to the waterproof gasket 6, and the divided cases 2 and 3 are connected to form the main body case 1. In this way, waterproof packing 6
is clamped with sufficient compression necessary for waterproofing over the entire area between the mating portions 2a and 3a without applying excessive force unnecessarily. By this compression, the waterproof gasket 6 is brought into pressure contact with each inner surface of the quadrangular hollow portion formed by the mating portions 2a, 3a and their inner and outer fitting protrusions 2b, 3b. Waterproof performance can be improved by pressure welding.

Although the assembly is completed in this way, there is no excessive compression of the waterproof gasket 6, and there is no imbalance in the compression of each part of the waterproof gasket 6.
It is possible to prevent the waterproof gasket 6 from seeking a compression escape outside between the mating portions 2a and 3a. For this reason,
As shown in FIG. 2, the mating portions 2a and 3a are mated together over the entire circumference without any gaps, providing a good appearance and providing a reliable waterproof effect. Moreover, it is possible to prevent a large force from acting on the screw receiving bosses 7, 8 through the screws 9, 10, and the strength of these bosses 9, 10 can be reduced, so the wall thickness of the screw receiving bosses 11, 10 can be reduced. obtain. Thereby, it is possible to reduce the amount of resin and the weight of the main body case 1, thereby reducing costs.

Further, the present invention can also be implemented in the reciprocating electric shaver shown in FIGS. 4 to 8. The parts of this embodiment that are different from the above embodiment will be explained below, and the same structural parts will be given the same reference numerals as those of the above embodiment, and the explanation thereof will be omitted.

In this embodiment, the motor 17 has its rotating shaft 1
It is built into the grip part 5 in the vertical direction with 8 facing upward. Therefore, the motor 17, the push-button switch (the main part 27, the operating part 30, etc.), and the storage battery 26 are installed in the grip part 5 of the main body case 1 along its axial direction. They are arranged from top to bottom in the order listed above. Therefore, the switch, motor 17 and storage battery 2 are connected to each other in the grip portion 5.
6 are no longer arranged so that they are overlapped in the front and back, and the grip part 5 is made thinner in the front and rear direction.
The entire body can be made thinner, and the length can be made to be just the right length to hold firmly in the palm of the hand, making it easy to grip.
In addition, the switch is a push-button type and may be pressed inadvertently when using the electric shaver, but this switch is connected to the motor 17 and the storage battery 26.
By disposing the switch between the grip section 5 and the grip section 5, the operating section 30 of the switch can be provided at approximately the center of the length of the grip section 5. Therefore, since the user grips the grip portion 5 with the crotch portion between the thumb and index finger facing the operating portion 30, careless and erroneous operation of the operating portion 30 can be prevented. Incidentally, in the conventional water-washable electric shaver shown in FIGS. 9 and 10, the storage battery a and the slide switch b are arranged one on top of the other in the front-rear direction, so the cylindrical main body case c The width of the grip portion d in the front-rear direction is large, and the length of the grip portion d is short. Therefore, it is difficult to grip the grip part d, and it is easy to accidentally operate the switch b. In addition, in Figures 9 and 10, e is the PC board, f is the motor, g is the bottom plate,
h is the outer blade body, and i is the switch part seal. Note that the above arrangement structure can also be applied to a normal dry-type electric shaver (regardless of whether it is a rotary type or a reciprocating type) that is not a washable type.

Furthermore, on the inner surface of each of the divided cases 2 and 3 of the main body case 1, at least one sheet is provided on the inner surface of each of the divided cases 2 and 3 so as to cross the divided cases 2 and 3 across the opposing walls and the wall that connects these two walls. Partition plate 38,
39 are integrally formed. Upper partition plate 3
The tips of the eight partition plates 39 are in contact with each other as shown in FIG. 6, and the tips of the lower partition plates 39 are also in contact with each other as shown in FIG. These partition plates 38 and 39 divide the inside of the main body case 1 into a plurality of compartments, for example compartment A on the outer blade 20 side, and a motor 17.
It is divided into a compartment B that stores the storage battery 26 and a compartment C that stores the push-button switch and the like. The partition plate 38 has a semicircular recess as shown in FIG. 6, and the upper end convex portion 17a of the motor 17 is inserted into this recess. The partition plate 39 also has a recess as shown in FIG. 7, and the lower end convex portion 17b of the motor 17 and the protruding terminal 40 are inserted into this recess, respectively. And motor 17
The end planes of are in surface contact with the partition plates 38 and 39. Such a structure improves the support strength of the motor 17 and also improves electrical safety. In other words, the main body case 1 is the waterproof gasket 6.
However, if the air sealed inside condenses, or if water intrudes from the outside, the surface contact between the partition plates 38 and 39 and these and the motor 17 will cause water to leak out. It is possible to prevent electrical hazards such as short circuits from moving along the inner surface of the main body case 1 and around the entire inner surface between the compartments A, B, and C. Furthermore, not only can the partition plates 38 and 39 reinforce the divided cases 2 and 3 themselves, but also the inner and outer fitting edges along the direction transverse to these cases 2 and 3.
This is particularly effective in suppressing deformation of b and 3b. Therefore, the waterproof gasket 6 can be more securely clamped, and the generation of gaps between the mating parts 2a and 3a can be more reliably prevented. In this embodiment, the outer fitting protrusion 3b is provided on the mating portion 3a of the split case 3, and the inner fitting protrusion 2b is provided on the mating portion 2a of the split case 2.

In addition, 41 in FIGS. 4 and 8 indicates a shaving portion 4.
This is an inner blade drive mechanism built into the motor 17, which has an eccentric drive shaft 43 protruding from an eccentric drive body 42 fixed to the rotation shaft 18 of the motor 17 at a position eccentric to the rotation shaft 18, and this shaft 43 is It is formed so as to be engaged with an elongated engagement groove (not shown) of the resin-made drive body 44. The drive body 44 has a thin flexible deformable portion 44 a and supports a reciprocating inner blade body 19 that is biased by a push spring 45 . Further, 46 is a waterproof gasket for the driving portion, and 47 is a gasket holder. Furthermore, 48 is a fixed locking convex portion of the outer blade body 20;
49 is a movable locking body that is pushed from the outside and moved by elastic deformation, and when engaged with these, the outer blade body 20
is about to be installed. A seat 13 is formed in the upper part of the front divided case 2 and serves as a receiving part for the waterproof gasket 46, and the long hole 44b of the driver 44 is formed in the upper part of the rear divided case 3. A pair of screw receiving bosses 7 are provided, and the screws 9 screwed into the bosses 7 also serve to attach the waterproof gasket 46. Reference numeral 50 designates a pivot of the discharge port cover 24, and the discharge port cover 24 is opened and closed by rotating around the pivot shaft 50, and the opening and closing is performed by reciprocating movement of the cover operating body 51.

Therefore, in this embodiment as well, the initial objective of the invention can be achieved as in the above-mentioned embodiment due to the relationship between the screw receiving bosses 7, 8 and the seats 13, 14.

Although each of the above embodiments is constructed as described above, in carrying out the present invention, the main body case, the divided case, the mating portion and its fitting protrusion, screws, It goes without saying that the specific structure, shape, position, material, etc. of the screw hole, seat, screw boss, waterproof packing, etc. are not limited to the above embodiments, and can be configured and implemented in various ways. be.

[Effect of idea]

According to the present invention, which has the gist of the structure described in the scope of the above-mentioned utility model registration claim, not only is it easy to assemble the built-in parts into the main body case, but also the waterproof packing can be temporarily fixed to the inner fitting protrusion. Since the waterproof gasket is prevented from being rolled up and the pair of front and rear split cases can be easily assembled, ease of assembly can be improved. This prevents the waterproof packing from escaping out of the mating parts of the pair of front and rear split cases, allowing the packing to be compressed with an appropriate amount of force. In addition to being able to be brought into pressure contact with the respective inner surfaces of the shaped hollow portions, the prevention of curling prevents the formation of gaps between the mating portions, which has the effect of improving the waterproof performance of the main body case.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention,
Figure 1 is a longitudinal side view, Figure 2 is a cross-sectional plan view of the main case with the waterproof gasket sandwiched in, and Figure 3 is a cross-sectional plan view of the main case with the split cases put together without the waterproof gasket. It is. Fourth
Figures 8 to 8 show other embodiments of the present invention;
The figure is a vertical side view, Figure 5 is a front view with the front split case and inner blade drive mechanism removed, Figure 6 is a cross-sectional view taken along the line - in Figure 4, and Figure 7 is - in Figure 4.
FIG. 8 is a cross-sectional view along the line, and FIG. 8 is a cross-sectional plan view of the shaving section. 9 and 10 show a conventional example of the other embodiment described above, in which FIG. 9 is a partially sectional side view, and FIG. 10 is a sectional view taken along the line - in FIG. 9. 1...Main case, 2, 3...Divided case, 2
a, 3a...Matching portion, 2b, 3b...Internal and external fitting protrusions, 6...Waterproof gasket, 7, 8...Screw receiving boss, 9, 10...Screw, 11, 12...Screw through hole, 13,14... Seat part.

Claims (1)

[Scope of Claim for Utility Model Registration] A main body case formed by connecting a pair of front and rear vertically split cases with screws, and an annular waterproof gasket between the annular mating parts of each of the split cases. one of the mating parts has an inner fitting ridge located facing the inside of the main body case, and the waterproof packing is wrapped around the outer peripheral surface of the ridge with its own elastic force, The other mating part has an outer fitting protrusion located facing the outside of the main body case, and the inner circumferential surface of this protrusion in contact with the outer surface of the waterproof packing is connected to the inner fitting protrusion. The waterproof packing has an inclined outer surface and a cross section that tapers toward the mating portion having the outer fitting protrusion. A seat with a screw hole through which the screw passes through is provided on the inner surface of one of the split cases, and a screw receiving boss is provided on the inner surface of the other split case, and these seats and the screw receiver are provided. The boss is formed to a size such that when the pair of front and rear divided cases are brought together without the waterproof gasket provided between these mating parts, the tips of the two come into contact with each other, and the thickness of the waterproof gasket is When this gasket is placed between the mating parts of the pair of front and rear split cases and the screws are not tightened, the two mating parts are spaced apart from each other, and the respective seats and screw receiving bosses are separated from each other. An electric shaver characterized in that it is sized to form a slight gap between the tips that is eliminated by tightening the screw.