JPH0427670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electric shavers, flashlights, and other small electric appliances, and particularly to improvements in the connection structure of a rechargeable battery to a wiring board housed in a main body case.

[Conventional technology]

In this type of small rechargeable electric device, the rechargeable battery is connected to a circuit on a wiring board by soldering, spot welding, or the like.

[Problem to be solved by the invention]

The size (length) of the rechargeable battery used may change depending on the model, but in this case, the wiring board also needs to be changed to one of a different size depending on the length of the rechargeable battery. However, it is not economical to prepare multiple types of wiring boards corresponding to the lengths of rechargeable batteries.

Therefore, an object of the present invention is to improve economic efficiency by preparing only one type of wiring board and allowing rechargeable batteries of different lengths to be mounted and connected to the wiring board.

[Means to solve the problem]

In the small electric device of the present invention, as shown in FIGS. 11 and 12, for example, a bendable and deformable connection plate 68 is provided on a part of the wiring board 51, and the connection plate 68 is filled with A plurality of holes 69, 70, 71 into which the conductive plate 67 provided at one end of the battery 54 is inserted are provided in the extending direction of the connecting plate 68, corresponding to the length of the rechargeable battery 54.

[Effect]

In such cases, when connecting rechargeable batteries 54 of different lengths to the wiring board 51,
The conductive plate 67 is inserted into the holes 69, 70, 7 closest to it.
All you have to do is select 1 and insert it into this.

In addition, when the conductive plate 67 is inserted into the hole of the connection plate 68 and then soldered or caulked, the stress generated during soldering or caulking is absorbed by the holes 69, 70, 71 of the connection plate 68.
This can prevent excessive force from being applied to the wiring board 51. Therefore, it is possible to prevent the pattern on the wiring board 51 from peeling off, which is likely to occur when excessive force is applied to the wiring board 51.

〔Effect of the invention〕

According to the small electric device of the present invention configured as described above, the rechargeable batteries 54 have different lengths on the wiring board 51.
In the case of mounting and connecting the rechargeable battery 54, it is sufficient to simply change the positions of the holes 69, 70, 71 into which the conductive plate 67 of the rechargeable battery 54 is inserted. This is convenient because it can accommodate cases where the values are different. Furthermore, when soldering or caulking the conductive plate 67 and the connecting plate 68, it is possible to effectively suppress the application of excessive force to the wiring board 51, resulting in peeling of the pattern formed on the board 51 and warping of the board itself. This makes it possible to prevent shape deformation and the like, and to make it easy to assemble into the main body case.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a synthetic resin main body case with electrical insulation properties, which is composed of two parts, a front case 2 and a back case 3, which are brought into contact with each other at their side faces, and has a flat box shape as a whole. Also, at the bottom, a boat-shaped bottom case 4 made of synthetic resin such as ABS is sandwiched between front and back cases 2 and 3. An outer cutter holder 5 is removably attached to the upper part of the main body case 1, and an outer cutter 6 made of nickel-cobalt electroforming or pressed thin stainless steel plate is stretched in an arch shape on this outer cutter holder 5. has been done. 7
numeral 8 is a sharp edge block that protrudes rotatably from the main body case 1; 8 is a switch button for operating the protruding edge block 7 when opening/closing the power supply; 9 is a switch button to prevent the switch button 8 from moving inadvertently. There is a lock button to prevent this. Further, numeral 10 is a light emitting diode for displaying power on to indicate that charging is in progress. The main body constructed in this way has tended to become thinner in recent years, and has a flat shape with the abutting surfaces of the two-part case located on the side surfaces, and absorbs the force applied to the front and back surfaces. There is an urgent need to improve mechanical strength and eliminate squeaks from the case.

Therefore, in the above embodiment, shock-absorbing elastic plates 11a, 11b, 12a, and 12b are attached to both side surfaces of the main body case 1, that is, the abutting surfaces of the front and back cases 2 and 3, and both side surfaces of the outer blade holder 5. . These elastic plates 11a, 11b, 12a,
12b is made of high pressure polyethylene and has a Shore hardness of 70.
It is preferable that the hardness is around 80, but since the hardness is somewhat high, by forming it in a thin shape (0.6 mm to 1.8 mm thick) and arched, the inner surface is recessed and local elasticity is improved. However, it is of course possible to use a neoprene rubber or silicone rubber plate with a Shore hardness of about 45 to 60.

Next, the driving portion housed in the main body case 1 will be explained with reference to FIG.

A lock button 9 and a switch button 8 that partially covers the lock button 9 are attached to the outer surface of the front case 2 so as to be able to slide freely on the outer surface. 8a and 8b through the guide holes 13a and 13b of the front case 2, and the mounting hole 1 of the polyacetal resin switch moderation plate 14.
4a and 14b, respectively, and heat welding the protruding tips, so that the front case 2 is sandwiched between the switch button 8 and the switch moderation plate 14.
At this time, as shown in FIG. 3, the lock button 9 made of polyacetal resin is housed between the switch button 8 and the front case 2 so that a part of it protrudes from the window 8c of the switch button 8, and the lock button 9 is Both ends of the longitudinal direction are provided with resilient push-up tongues 9a and 9b that are inclined slightly downward and extend outward, so that the protruding portion is pressed as shown in FIG. As a result, the tongues 9a and 9b of the lock button 9 are deformed so as to spread out slightly, as shown by broken lines, and descend with elasticity. This tongue piece 9a, 9
b may extend inward. Two pins 9c and 9d protrude from the center of the lock button 9, and are inserted into elongated holes 15a and 15b of the front case 2, respectively.One pin 9c, which passes through the elongated hole 15a, is a switch. The arm portion of the lock piece 14c integrally formed on the side edge of the moderation plate 14 (indicated by 〓 in Fig. 3)
The lock button 9 is in contact with the lock button 9 and moves up and down as the lock button 9 moves up and down. A triangular hooking protrusion 16 is formed on the inner side edge of the long hole 15a, and the locking piece 1
When the switch button 8 is normally closed, the bulge portion 4c engages with the protrusion 16, and when pressed by the pin 9c, the bulge portion descends and comes off from the protrusion 16, thereby locking the button. The condition is canceled. The other pin 9d inserted into the elongated hole 15b is for guiding the sliding movement of the lock button 9 and restricting its sliding along the elongated hole 15b.

This lock button 9 needs to be easy to operate regardless of the user's dominant hand. For example, as shown in FIG. 5, even if the finger H is placed on only one end of the lock button 9, the lock button 9 itself is long and soft, and there are push-up tongues 9 at both longitudinal ends.
9a and 9b, the pin 9c that presses the locking piece 14c that creates the locked state is located in the center of the locking button 9, so if you press it only on the left end side, the left end side tongue piece 9a expands and undergoes elastic deformation, and the left half of the lock button 9 is also significantly elastically deformed, and despite the elastic deformation of the right half, especially the right end tongue piece 9b, the pin 9c descends and the lock piece 14c is pressed, releasing the locked state. Ru. Conversely, if a right-handed user presses the right side, the opposite effect will occur and the locked state will be released.

The optimum protruding position of the pin 9c for this purpose is preferably an intermediate position of the entire length of the lock button 9.

Therefore, no matter where you press the lock button 9 with your finger, the lock piece 14c will be pushed down by the pin 9c, and the bulge at the tip will come off the vertical surface of the triangular hook projection 16 of the elongated hole 15a. If the locked state is released and the switch button 8 is slid, the switch moderation plate 14 will slide. Elastic arms 14 are integrally attached to both lower ends of the switch moderation plate 14.
d and 14e are formed to engage the moderation pin 17 on the inner surface of the front case 2 in three stages to generate an elastic force.
In addition, a round hole 14f is provided in the center of the switch moderation plate 14 that slides in this manner, and an operating pin 1 of the switch portion 18 (indicated by a broken line in FIG. 2), which will be described later.
8a is fitted, and the switch portion 18 is slid. Along with this, the switch moderation plate 14
A hook-shaped portion 14g is integrally formed on the upper side of the holder.
This hook-shaped portion 14g is located at the right-hand end notch 19 of the seesaw plate 19 when the switch moderation plate 14 is positioned in the two-stage upward sliding state in three stages, that is, in the state in which the power switch part 18 is turned on for the first time.
a, the three stages, that is, the switch part 18
This is for pushing up the notch 19a so that the edge cutting blade block 7 can be rotated and protruded while maintaining the ON state.

In other words, the seesaw plate 19 has a rotation hole 19b fitted into a rotation pin 20 on the inner surface of the front case 2, and can rotate around this pin 20. A pin 19b is provided at the left end, and this pin 19b The seesaw plate 19 penetrates into the horizontal slide hole 21a of the rotation operation lever body 21, and the rotation pin 20
Since the tip of the rotation pin 20 further protrudes from the seesaw plate 19 when it is fitted into the
It is engaged with b.

Therefore, when the seesaw plate 19 rotates counterclockwise, the pin 19b is moved from the rotation operating lever body 21.
The lever body 21 acts to push down the lever body 21 while sliding in the horizontal slide hole 21a of the pivot pin 20.
Since the rotation is restricted by the vertical slide groove 21b that engages with the vertical slide groove 21b, the rotation operation lever body 21 ends up sliding downward.

An inverted L-shaped elastic lever 21c is integrally formed on the upper part of the rotation operation lever body 21, and the tip thereof is inserted into a right-angled notch 7b provided slightly behind the rotation pin 7a of the sharp edge block 7. The pivot pin 7a is engaged with the edge block 7 of the front case 2.
It engages with rotation recesses 23 provided on both sides of the protruding window 22.

Therefore, when the rotation operating lever body 21 slides downward, the elastic lever 21c engaged with the right-angled notch 7b acts to press the notch 7b downward, but the sharp edge block 7 Since the blade block 7 is rotatably supported by the rotation pin 7a, the blade block 7 rotates and projects from the projecting window 22 at a right angle. At this time, the elastic lever 21
c moves downward, while the notch 7b rotates, so the elastic lever 21c is elastically deformed inward in a slightly arched shape, and then, after the blade block 7 protrudes, it returns to its original state. However, at this time, a click feeling occurs, and the protruding state can be maintained.

24 is a motor, with an eccentric pin 26 on the rotating shaft 25.
Attach the eccentric stand 27 with
0 and 31 are screwed into the screw holes 32 and 33 of the motor 24 and fixed.

34 is a drive converter made of polyacetal, and has four deformed S-shaped thin elastic legs 3 at the side ends in the reciprocating direction.
5 are integrally provided, two of each leg 35 on each side are connected by a mounting base 36, and four round pins 37 are protruded from the lower surface of the mounting base 36, and are inserted into the mounting holes 38 of the drive base 28. inserted, the drive converter 34 and the drive base 28
are temporarily fastened, and in this fastened state, the eccentric pin 26 is fitted into the elongated hole 39 on the back surface of the drive converter 34. Further, a drive rod 40 is mounted on the upper surface of the drive converter 34.
are integrally molded, and a hair receiving tray 41, an inner blade push-up spring 42, and an inner blade mounting base 43 are sequentially attached to the drive rod 40, and are prevented from coming off with a mounting bracket 44. Reference numeral 45 denotes a semicircular arc-shaped inner cutter body that is detachably attached to the inner cutter mounting base 43. The drive base 28 and the drive converter 34 are temporarily connected to each other.
The wall thickness T ₁ and the wall thickness of the mounting base 36 of the drive converter 34
A groove 46 with a sum of T ₃ and T ₂ is formed on the inner wall of the front case 2, and the case is slid into the groove 46 for positioning. For the press-fitting locking force required at this time, it is appropriate for the material of the drive converter 34 to be made of a soft or elastic synthetic resin such as nylon or polyacetal.

In this state, the protruding window 2 of the sharp edge block 7
2 is a shielding plate 47 formed on the front surface of the drive base 28;
is closed to prevent hair from entering. Further, elastic arms 48 extending from both ends of the drive base 28 are exposed through openings 49 opened at the mating surfaces of the front and back cases 2 and 3, and as shown in FIG. Its tip projection 48a is engaged with a hooking recess 50 on the inner surface of. Therefore, in order to remove the outer cutter holder 5, the left and right walls are pinched as shown in FIG. 6, and then pulled up. As shown by the broken line in FIG. is removed from the hook recess 50, and the outer blade holder 5 can be removed. At this time, as shown in FIG. 7, a gap a is created at the base due to the inward deflection of the elastic arm 48. Generally, hair particles try to enter the main body case 1 through this gap, but in this case, the upper surfaces of the shock-absorbing elastic plates 11a and 11b have elasticity and abut against the base of the elastic arm 48. Therefore, the above-mentioned gap can be prevented from occurring, and there is no need to attach a filler such as a sponge body to the conventional gap.

Note that when removing the outer cutter holder 5, a pulling force sufficient to deform the elastic arm 48 inward is required. Generally, a finger rest recess is provided at the finger rest position of the outer cutter holder 5 for this purpose, but this is undesirable as it causes discomfort and pain to the fingertips. However, in this case, elastic plates 12a and 12b are attached to the side surface of the outer cutter holder 5 at the finger contact positions, and meat relief recesses 12c and 12d are provided on the inner surface at the position where the fingers are most strongly applied. As shown, the elastic plates 12a and 12b are recessed in response to fingertip force, forming a finger-resting surface and preventing slippage. The fine irregularities 12e and 12f in the lower part of FIG. 6 serve to effectively prevent slipping when the blade holder 5 is installed.

Next, the power supply section will be explained in detail with reference to FIGS. 8 and 9.

8 and 9, 51 is a wiring board, a transformer 52 with a temperature fuse 57, a rectifier 5
3. A rechargeable battery 54, a display light emitting diode 55, and a display current limiting resistor 56 are soldered and installed at the positions indicated by the dashed lines in FIG. Directly soldered or spot welded. The wiring state is as shown in FIG.

As shown in FIG. 11, the switch section 18 is constructed by placing an H-shaped movable contact plate 60 on contacts 65 and 66 exposed on the lower surface of a wiring board 51, attaching an operation plate 61 thereon, and then attaching a mounting frame 62 from above. At the same time, the eight pins 63 protruding from the mounting frame 62 are inserted into the positioning holes 64 provided at the periphery of the switch part 18 of the wiring board 51, and only the pins 63 at the four corners are thermally deformed to be used as fixing means, and the remaining The four pins 63 near the center of the rechargeable battery 54
Used as a positioning pin. A conductive plate 67 having a U-shaped tip is spot welded to one end of the rechargeable battery 54, and a connection plate 68 protruding from the tip of the switch portion 18 has a plurality of holes 69, 70, 7.
1 is provided, and is bent from each position of the holes 69, 70, 71 according to the total length of the rechargeable battery 54, and the U-shaped hole is inserted from below into the open state of the holes 69, 70, 71 created when the battery is bent. Temporary positioning can be achieved by inserting the conductive plate 67 and pulling it upward, and soldering can be carried out as is. In addition, the holes 69, 70,
By providing the holes 71, it is possible not only to prevent the deformation stress during bending from affecting the inside of the wiring board 51, but also to reduce the stress generated when the conductive plate 67 and the connection plate 68 are soldered or caulked.
9, 70, and 71, no excessive force is applied to the substrate 51, and peeling of the pattern on the substrate 51 can be prevented.

Of course, before bending the connecting plate 68, the conductive plate 67
By inserting and pulling up the connecting plate 68, the connecting plate 68 will be bent at the optimum position, and the troublesome pre-bending process can be omitted.

Note that a large number of holes 72 are provided on the back surface (upper surface in FIG. 12) of the switch portion 18 to partially expose the contacts 65 and 66 to provide a heat dissipation effect when the contacts are opened and closed.

Next, a method for manufacturing the wiring board 51 will be explained.

In FIG. 13, first, conductive pieces 73 patterned based on the wiring diagram shown in FIG. 10 are interconnected and molded so that they do not fall apart individually. The base material of the conductive piece 73 is a thin plate made of a tin-containing cupronickel alloy with a thickness of 0.12 to 0.2 mm, and is patterned by pressing or etching. 1st
Although the pattern shown in Figure 3 is for one machine, it is convenient for post-processing to continuously form it into a hoop-shaped thin plate.

Next, this patterned conductive piece 73 is loaded into a synthetic resin injection mold, and glass fiber is inserted into the mold.
A substrate 51 having a thickness of 2 mm is molded from ABS resin as shown in FIG. In this state, the conductive piece 73
are connected to each other and are not configured as a circuit, so they are cut by a press at the points indicated by ⓓ in FIG. At this time, stress due to press processing tends to promote partial deformation of the wiring board 51, but in this case, the cut portion is placed on the outer periphery of the board 51, for example, 74, 7
By arranging them as shown in numerals 5 and 76, cracks, chips, and deformations caused by the above stress can be suppressed.

Particularly, in the part indicated by the reference numeral 74, by detouring the conductive change 73 to the outside of the board, the cut part can be actively moved away from the board 51, and
The degree of freedom in pattern creation can be improved.

In addition, the portion indicated by reference numeral 76 is detoured so that the conductive piece 7
3 are connected, but the broken line part is cut leaving a certain length.

By cutting outside the board in this manner, partial protruding pieces K ₁ , K ₂ , K ₃ are formed from the wiring board 51, and when this wiring board 51 is assembled into the main body case 1, the parts of the main body case 1 are removed. The press edge catches on the inner wall surface, providing a resilient positioning action, and when assembling the wiring board 51, it is only necessary to push the wiring board 51 into the main body case 1 at the end.

The above-mentioned power supply part is a rechargeable power supply that is equipped with a transformer 52 itself, but it has two types of power supply that are popular in recent years: a direct drive power supply using an external power supply, and a rechargeable power supply that is charged by an external power supply. Regarding the 2-way type, it is inconvenient to manufacture a separate wiring board from the standpoint of versatility and economy. Therefore, a method for manufacturing a wiring board that satisfies both will be described below.

The rechargeable power source is as explained in FIGS. 10 and 13, but the circuit of the 2-way type is shown in FIG. 15. P ₁ is the so-called adapter side that converts commercial power to the necessary low DC voltage, and includes fuse TF ₂ , transformer T ₄ , transformer T ₄
A diode that rectifies AC low voltage to DC low voltage.
It consists of D ₁ and D ₂ , and its output is supplied to the main body side power supply P ₂ through a plug P ₃ shown by a broken line in FIG.
Main unit side power supply P ₂ is charging current limiting resistor R ₁ and rechargeable battery 5
4. It consists of a display light emitting diode 55, a display current limiting resistor 56, and a switch section 18', and the terminal of the motor 24 is connected to the output end. FIG. 17 shows a patterned state of this main body side power source _P2 . The pattern itself is the 13th one of the rechargeable power supply mentioned above.
It is the same as the figure and the shape after injection molding is also the same, but the part cut by press working (indicated by ⓓ) is slightly different.

The major differences are as follows. The one in FIG. 17 has a connecting pin 78 of a boat-shaped bottom case 4', into which a plug _P3 is inserted and connected to a power supply connection plate 77' at the bottom of a wiring board 51', as shown in FIG.
13, the conductive pieces 80, 81 that connect the power supply connecting plate 77 are left without being press-cut.
1 by press cutting and removing it, leaving the leaf springs 82, 83.
The point is that the plug blade 84 is configured to slide into contact with a plug blade 84 that is inserted into a commercial power outlet.

Therefore, there is no need to mold the dedicated wiring boards 51 and 51' for the rechargeable power supply and the 2-way, and it is only necessary to slightly change the cutting position by press processing, for example, by replacing the punch position of the press mold. It is economically superior.

In this method of manufacturing a wiring board, in which pre-patterned conductive pieces are injection-molded with synthetic resin as a mechanical strength structural material and embedded, it is important to note that the buried conductive pieces are bent into a curved shape due to the injection molding pressure. The substrate itself may warp due to distortion or a difference in shrinkage rate between the conductive piece and the synthetic resin. For this reason, when parts such as wide transformers or straight rod-shaped rechargeable batteries are mounted and mounted, gaps tend to be created between the board and these parts, causing parts to wobble and imperfections in the soldered parts. Undesirable.

Therefore, in this case, the surface of the wiring board 51 on which the components are mounted, that is, the surface 51a shown in FIG. 9, is almost completely covered with synthetic resin, while the surface on which the component lead wires are soldered In other words, the presser ribs 87, 88, 89 which open most of the surface 51b that appears in FIG. 19 and prevent the conductive piece 73 from lifting up.
90 are provided, and these presser ribs 87, 88,
By extending and intersecting 89 and 90 in a straight line, it is formed so that the warp caused by the surface 51a side is pulled in the opposite direction and absorbed. Of course, it is possible to absorb this type of shrinkage strain by mixing insulating reinforcing materials such as glass fibers into the synthetic resin, but this is insufficient, so a linear shape with strong mechanical strength is used. By arranging the conductive pieces 7 in a grid pattern with a large area within the frame, the conductive pieces 7 can be
In addition to improving the holding performance of 3 and making it easier to prevent positional displacement due to injection pressure, the conductive piece 73 exposed within the frame is wide, preventing thermal deformation of the synthetic resin by the tip of the soldering iron when soldering parts. Moreover, partial lifting of the conductive piece 73 due to this thermal deformation can be prevented. The structure of the power supply part and the manufacturing method of the wiring board described above can be effectively applied not only to electric shavers but also to rechargeable flash lights and other small electric devices.

The power supply connection plates 77, 77' are temporarily assembled by elastically fitting the projecting pieces 85, 85' at both ends into recesses 86, 86' provided in the inner walls on both sides of the boat-shaped bottom cases 4, 4'. Ru. An example is shown in FIG.

Further, in FIG. 14, 91 and 92 are sponge or rubber tape-like cushioning materials that elastically press the rechargeable battery 54 and the motor 54, respectively, and 93 and 94 are elastic plates 11a and 11b.
It is a hook-shaped hook-shaped hook protrusion for easily attaching to the main body case 1, and is designed to be elastically deformed and hooked to the notch hole 95 formed on the mating surfaces of the two-part case 2 and 3. Arc-shaped elastic plate 11a,
When 11b is deformed, the hooking protrusion 93,
94 expands and deforms to hold it even more strongly and can compensate for the amount of deformation of the elastic plates 11a and 11b. Also, for this purpose, the front and back cases 2 and 3
As shown in FIG. 14, a gap S is provided between the mating surfaces of the elastic plates 11a and 11b.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention;
Fig. 2 is an exploded view of the head of the same embodiment, Fig. 3 is a cutaway cross-sectional view of the switch part of the same embodiment, Fig. 4 is an explanatory diagram of the operating state of the switch part, and Fig. 5 is an irregularity of the switch part. Fig. 6 is a vertical sectional view of the head of the embodiment, Fig. 7 is a diagram of the outer blade holder mounting structure of the embodiment, and Fig. 8 is the drive of the embodiment. 9 is an exploded perspective view of the power supply section of the same embodiment; FIG. 10 is a circuit diagram of the power supply section; FIG. 11 is a sectional view of the switch section of the power supply section; The figure is an exploded view of the switch part, Figure 13 is a plan view of the wiring board of the power supply part, Figure 14 is a sectional view of the main body of the same embodiment, and Figure 15 is a circuit of another embodiment of the power supply part of the present invention. 16 is a perspective view of the power supply assembly of the same embodiment, FIG. 17 is a plan view of the wiring board of the same embodiment, FIG. 18 is a lower vertical sectional view of the same embodiment, and FIG. 19 is this FIG. 9 is a rear perspective view of the drive power supply assembly shown in FIG. 8 of the embodiment of the invention. 1... Main body case, 51... Wiring board, 54...
...Rechargeable battery, 67...Conductive plate, 68...Connection plate, 6
9, 70, 71... hole.

Claims (1)

[Claims] 1. A rechargeable battery 54 having a conductive plate 67 at one end thereof.
and a wiring board 51 from which a bendable and deformable connection plate 68 is extended, the connection plate 68 having a hole 69 into which the conductive plate 67 is inserted; A small electric device characterized in that a plurality of 70 and 71 are provided in the extending direction of the connecting plate 68 corresponding to the length of the rechargeable battery 54.