JPH0682936B2 - Small electrical equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric razor, a flashlight, and other small electric devices, and more particularly, to an improvement in a mounting structure of a wiring board housed in a main body case.

[Conventional technology]

Conventionally, in order to eliminate the hassle of fixing the wiring board in the main body case with screws in this type of small electrical equipment, and to alleviate the vibration and shock, between the wiring board and the main body case. There is one that holds and fixes the wiring board to the main body case with an elastic body such as rubber interposed (for example, Japanese Utility Model Publication No. 49-5638 and Japanese Patent Publication No. 53-86360).

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional example, it is necessary to specially prepare an elastic body such as rubber which is separate from the wiring board, and therefore it is not only necessary to manage the inventory until the elastic body is assembled. It takes time and effort to attach the elastic body to the wiring board or the main body case side.
There is still room for improvement.

Therefore, an object of the present invention is to use a part of the conductive piece integrally covered and embedded in the wiring board as a positioning member with respect to the main body case of the wiring board, thereby facilitating the handling and assembly thereof.

[Means for Solving the Problems]

According to the present invention, as in the illustrated example, the wiring board 51 formed by covering and embedding the patterned conductive piece 73 having elasticity in a synthetic resin is housed in the main body case 1, and the conductive material A part of the piece 73 is projected to the outside of the wiring board 51 to form a protruding piece K ₃ , and the wiring board 51 is housed in the main body case 1, and the protruding piece K ₃ is elastically contacted with the inner wall of the main body case 1. The wiring board 51 is positioned by this elastic contact action.

[Action]

When mounting the wiring board 51 inside the main body case 1, the wiring board 51 is simply resisted against the elastic force of the projecting piece K _3.
You just have to push it in.

Since the base of the protruding piece K ₃ is embedded and integrated with the wiring board 51, it does not come off or come off from the wiring board 51 at the time of the above-mentioned pushing, and exhibits a stable and reliable positioning function.

〔The invention's effect〕

According to the present invention, the positioning protruding piece K ₃ can be obtained simultaneously with the manufacturing of the wiring board 51 in which the wiring-patterned conductive piece 73 is embedded, and also as the wiring material thereof. It is advantageous in terms of material cost.

Moreover, when the wiring board 51 is attached to the main body case 1, it is necessary to simply push the wiring board 51 into the main body case 1 against the elastic force of the projecting piece K ₃ , requiring special mounting brackets and assembling steps. Easy and quick positioning is possible.

Further, when the wiring board 51 is pushed in, the protruding piece K ₃
It does not come off or fall off and can be positioned reliably and reliably, and is highly reliable.

〔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 having an electric insulation property, which is composed of two divided bodies in which a front case 2 and a back case 3 are butted against each other at a side surface thereof, and has a flat box shape as a whole. In addition, a ship-shaped bottom case 4 made of synthetic resin such as ABS is held between the front and back cases 2 and 3 at the bottom. An outer blade holder 5 is detachably mounted on the upper part of the main body case 1, and an outer blade 6 made of nickel-cobalt electroformed or pressed stainless steel sheet is stretched in an arch shape on the outer blade holder 5. Has been done. 7 is a knurled blade block that rotatably projects with respect to the main body case 1, 8
Is a projecting operation switch button of the shaving blade block 7 when the power source is opened and closed, and 9 is a lock button for preventing the switch button 8 from being inadvertently moved. Further, 10 is a light emitting diode for displaying electricity, which indicates that the battery is being charged. The main body configured in this way has tended to become thinner in recent years, and moreover, it has a flat box shape in which the abutment surface of the two-divided case is located on the side surface, and the abutment surface of the abutment surface is absorbed while absorbing the force applied to the front and back surfaces. It is necessary to improve the mechanical strength and eliminate the squeak noise of the case.

Therefore, in the above embodiment, the shock absorbing elastic plates 11a, 11b, 12a, 12b are provided on both side surfaces of the main body case 1, that is, the abutting surfaces of the front and back cases 2, 3 and both side surfaces of the outer blade holder 5.
Is installed. The elastic plates 11a, 11b, 12a, 12b are preferably made of high-pressure polyethylene and have a Shore hardness of about 70 to 80, but they have a slightly high hardness (thickness 0.6 m).
m ~ 1.8 mm), and by forming an arch shape,
The inner surface is recessed so as to exert surface elasticity instead of local elasticity, but of course it is also possible to form it with neoprene rubber or silicone rubber plate having a Shore hardness of about 45 to 60.

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

A lock button 9 and a switch button 8 that partially covers the lock button 9 are slidably mounted on the outer surface of the front case 2. The specific structure of the lock button 9 is the inner boss of the switch button 8. 8a and 8b are inserted through the guide holes 13a and 13b of the front case 2, and the mounting hole 14 of the switch accelerative plate 14 made of polyacetal resin is inserted.
The front case 2 is sandwiched between the switch button 8 and the switch moderating plate 14 by inserting into the a and 14b and heat-welding the protruding tips. At this time, as shown in FIG. 3, the lock button 9 made of polyacetal resin is the window 8C of the switch button 8.
Switch button 8 and front case 2 so that part of it protrudes from
The lock button 9 is housed between the lock button 9 and the lock button 9, and the lock button 9 is provided at both ends in the longitudinal direction thereof with elastic push-up tongues 9a and 9b which are inclined slightly downward and extend outward. As shown in FIG. 4, by pressing the protruding portion, the tongues 9a and 9b of the lock button 9 are slightly expanded as shown by the broken line and elastically descended. This tongue 9a, 9
b may extend inward. Two pins 9c and 9d are provided on the central portion of the lock button 9 so as to project.
One of the pins 9c, which are respectively inserted into the long holes 15a and 15b of the lock pin 14c and which penetrate the long hole 15a, are formed on the side edge of the switch moderation plate 14 with the arm portion of the lock piece 14c (see FIG. 3). (Shown by), and the lock button 9 moves up and down according to the up and down movement. A triangular hooking protrusion 16 is formed on the inner edge of the elongated hole 15a, and the bulging portion of the lock piece 14c engages with the protrusion 16 when the switch button 8 is normally closed, and the pin 9c When pressed by, the bulging portion descends and comes out of the protrusion 16, and the locked state is released. The other pin 9d penetrating the elongated hole 15b is for sliding guide of the lock button 9 and regulates sliding along the elongated hole 15b.

The lock button 9 needs to have high operability regardless of the dominant hand of the user. For example, as shown in FIG. 5, even when only one side of the lock button 9 is touched with the finger H, the lock button 9 itself is long and soft, and the push-up tongues 9a on both ends in the longitudinal direction are provided. 9b is provided, whereas the pin 9c that presses the lock piece 14c that causes the locked state is located in the center of the lock button 9, so if you press only the left end side, the left end tongue piece 9a expands. In addition to the elastic deformation, the left half of the lock button 9 is also significantly elastically deformed, and the pin 9c descends and the lock piece 14c is pressed and the locked state is released regardless of the elastic deformation of the right half, especially the right end side tongue piece 9b. On the other hand, if the user with a right-handed hand presses the right side, it works in reverse and the locked state is 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 which position of the lock button 9 is pressed with a finger, the lock piece 14c is pressed down by the pin 9c, and the bulged portion at the tip is disengaged from the vertical surface of the triangular hooking protrusion 16 of the long hole 15a and is locked. When the switch button 8 is slid as it is, the switch moderation plate 14 slides.
Elastic arms 14d and 14e are integrally formed at both lower ends of the switch moderation plate 14, and the moderation pins 17 on the inner surface of the front case 2 are engaged in three steps to generate an elastic force. Further, a circular hole 14f is provided in the central portion of the switch moderating plate 14 which slides in this manner, and an operation pin 18 of a switch portion 18 (shown by a broken line in FIG. 1) described later is provided.
When a is fitted, the switch section 18 is slid. Along with this, the hook-shaped portion 14 is provided on the upper side of the switch moderation plate 14.
g is integrally formed. This hook-shaped portion 14g is provided with a switch moderating plate 14 that is positioned in a three-step upward sliding state.
In the two stages, that is, when the power switch unit 18 is turned on for the first time, it engages with the right end cutout 19a of the seesaw plate 19, and in three stages, that is, the switch unit 18 keeps the ON state The notch 19a is formed so that the block 7 is rotated and projected.
Is for pushing up.

In other words, the seesaw plate 19 is the rotation pin 20 on the inner surface of the front case 2.
A pin 19b is provided at the left end by fitting a turning hole 19b into the turning hole 19b, and the pin 19b is inserted into the horizontal slide hole 21a of the turning operation lever 21. At the same time, the tip of the turning pin 20 further projects from the seesaw plate 19 in a state where the seesaw plate 19 is fitted to the turning pin 20, so that the tip of the turning pin 20 slides vertically in the vertical slide groove 21b. Is engaged with.

Therefore, when the seesaw plate 19 rotates counterclockwise, the pin 19b moves in the horizontal slide hole 2 of the rotation operation lever body 21.
While sliding in 1a, it acts to push down this lever body 21, while this lever body 21 is
Since the rotation is restricted by the vertical slide groove 21b engaged with the rotation operation lever body 21, the rotation operation lever body 21 slides downward.

An inverted L-shaped elastic lever 21c is provided on the upper part of the rotation operation lever body 21.
Are integrally formed, and the tip thereof engages with a right-angled cutout portion 7b provided slightly rearward of the rotation pin 7a of the knurled blade block 7, and the rotation pin 7a of the front case 2 is formed. It engages with rotation recesses 23 provided on both sides of the protruding window 22 of the shaving blade block 7.

Therefore, when the rotation operation lever body 21 slides downward, the elastic lever 21c engaged with the right-angled cutout portion 7b moves to the cutout portion 7.
Although it acts so as to press b downward, since the knurled blade block 7 is rotatably supported by the rotating pin 7a, the blade block 7 rotates to form a right angle from the protruding window 22. Will be projected. At this time, the elastic lever 21c moves downward, whereas the cutout portion 7b rotates, so that the elastic lever 21 elastically deforms inward in a slightly arcuate shape, and after the blade block 7 projects, The state is restored to the state described above, and a click feeling is generated at this time, and the protruding state can be maintained.

24 is a motor, an eccentric base with an eccentric pin 26 on the rotating shaft 25.
27 is mounted, and projected from the through hole 29 of the drive base 28 to the upper surface,
In that state, the screws 30 and 31 are screwed into the screw holes 32 and 33 of the motor 24 to be fixed.

34 is a drive converter made of polyacetal resin, and four deformed S-shaped thin elastic legs 35 are integrally provided at the side end in the reciprocating direction, and each leg 35 is connected to the mounting base 36, two on each side. Then, four round pins 37 are projected on the lower surface of the mounting base 36, inserted into the mounting holes 38 of the drive base 28, and the drive converter 34 and the drive base 28 are temporarily fixed. In the attached state, the eccentric pin 26 is fitted in the long hole 39 (shown by a broken line) on the rear surface of the drive converter 34.
Further, a drive rod 40 is integrally formed on the upper surface of the drive converter 34, and a bristle tray 41, an inner blade pushing-up spring 42,
Inner blade mounts 43 are sequentially mounted, and are secured by mounting brackets 44. Reference numeral 45 denotes a semi-circular inner blade body that is detachably attached to the inner blade mounting base 43. The one in which the drive base 28 and the drive conversion body 34 are temporarily fixed and bonded to each other is the sum (T ₂ ) of the thickness of the drive base 28 (T ₁ ) and the thickness of the mounting base 36 of the drive conversion body 34 (T ₂ ). ₃ ) Groove 46
Is formed on the inner side wall of the front case 2 and is slid into the groove 46 for positioning. At this time, the press-fitting locking force required is made of a soft or elastic synthetic resin such as nylon or polyacetal resin as the material of the drive converter 34.

In this state, the projecting window 22 of the shaving blade block 7 is closed by the shielding plate 47 formed on the front surface of the drive base 28 to prevent the entry of dust. Further, the elastic arms 48 extending from both sides of the drive base 28 are exposed from the openings 49 opened on the mating surfaces of the front and back cases 2 and 3, and as shown in FIG. The tip projection 48a in the hooking recess 50 on the inner surface of the
Are engaged. Therefore, in order to remove the outer blade holder 5, the left and right walls thereof are pinched as shown in FIG. 6 and then pulled up, the elastic arm 48 bends inward as shown by a 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, due to the inward bending of the elastic arm 48, a clearance a is generated in the base portion. Generally, debris tries to enter the main body case 1 through this gap, but in this case, the shock absorbing elastic plate is used.
Since the upper surfaces of 11a and 11b are elastically butted against the base of the elastic arm 48, it is possible to prevent the occurrence of the above-mentioned gap, and it is not necessary to attach a filling material such as a sponge body to the conventional gap. .

When removing the outer blade holder 5, use the elastic arm 48
A sufficient pulling force is required to deform the inward. Generally, for this purpose, a finger hooking recess is provided at the finger contact position of the outer blade holder 5, but this is not preferable because it gives discomfort or pain to the fingertip.
However, in this case, the elastic plates 12a and 12b are attached to the finger contact positions on the side surface of the outer blade holder 5, and the meat escape recesses 12c and 12d are provided on the inner surface at the position where the finger is most strongly hit.
As shown in the figure, the elastic plates 12a, 12b are recessed in accordance with the fingertip force to form a finger-holding surface and can be prevented from slipping.
The fine irregularities 12e and 12f on the lower side in FIG. 6 effectively prevent slipping when the outer blade holder 5 is mounted.

Next, the power source portion will be specifically described with reference to FIGS. 8 and 9.

In FIGS. 8 and 9, 51 is a wiring board, and the transformer 52 with the temperature fuse 57, the rectifier 53, the rechargeable battery 54, the display light emitting diode 55, and the display current limiting resistor 56 are located at the positions shown by the alternate long and short dash line in FIG. Are soldered and attached to
The terminals of the motor 24 are directly soldered or spot-welded to the output terminals 58 and 59. The connection state is as shown in FIG.

As shown in FIG. 11, the switch section 18 mounts the H-shaped movable contact plate 60 on the contacts 65 and 66 exposed on the lower surface of the wiring board 51, mounts the operation plate 61 on this, and further mounts the mounting frame 62 from above. 8 pins 63 projecting from the mounting frame 62 are inserted into the positioning holes 64 provided on the periphery of the switch portion 18 of the wiring board 51, and only the pins 63 at the four corners are thermally deformed and used as the fixing means. The four pins 63 near the center are projected as they are and used as positioning pins for the rechargeable battery 54. A conductive plate 67 having a U-shaped tip is spot-welded to one end of the rechargeable battery 54, and a connecting plate projecting from the tip of the switch portion 18 is connected.
A plurality of long holes 69, 70, 71 are provided in the 68, and the long holes 69, 70, 71 are bent from the respective positions of the long holes 69, 70, 71 according to the total length of the rechargeable battery 54, and the long holes 69 generated when the bending is performed. If the U-shaped conductive plate 67 is inserted from below in the open state of 70, 71, and pulled up, provisional positioning can be performed, and soldering can be performed as it is. In addition, the provision of the elongated holes 69, 70, 71 also serves to prevent the deformation stress at the time of bending from affecting the inside of the wiring board 51. A large number of holes 72 are provided on the rear surface (upper surface in FIG. 12) of the switch portion 18 to partially expose the contacts 65 and 66 to provide a heat radiation effect when the contacts are opened and closed.

Next, a method of manufacturing the wiring board 51 will be described.

In FIG. 13, first, the conductive pieces 73 patterned based on the wiring diagram shown in FIG. 10 are formed by being connected to each other so as not to become individual. The base material of the conductive piece 73 is a thin plate made of tin-containing white copper alloy and having a thickness of 0.12 to 0.2 mm, which is patterned by pressing or etching. First
The pattern shown in FIG. 13 is for one unit, but it is convenient for post-processing to continuously form a hoop-shaped thin plate.

Next, the patterned conductive piece 73 is loaded into a synthetic resin injection molding die, and a substrate 51 having a thickness of 2 mm shown in FIG. 9 is molded from ABS resin containing glass fiber. In this state, the conductive pieces 73 are connected to each other and are not configured in a circuit manner. The point indicated by is cut by a press. At this time, the stress due to the press working easily promotes partial deformation of the wiring board 51,
In this one, the cut portion is the outer peripheral portion of the substrate 51, for example, 74, 75,
By arranging as shown by 76, cracks, chips, and deformation due to the above stress can be suppressed.

In particular, by diverting the conductive piece 73 to the outside of the substrate, the portion indicated by reference numeral 74 can positively avoid the cut portion from being away from the substrate 51, and can improve the degree of freedom in pattern formation.

Further, although the portion indicated by reference numeral 76 is detoured to connect the conductive piece 73, the broken line portion is cut while leaving a certain length.

By cutting outside the board in this way, the wiring board 51
Partial protruding pieces K ₁ , K ₂ and K ₃ are formed from the wiring board 51.
When the is assembled into the main body case 1, the press edge is caught on the inner wall surface of the main body case 1, and the elastic positioning action is obtained. When assembling, the wiring board 51 is simply pushed into the main body case 1. It will be good.

The power source section is a rechargeable power source having a transformer 52 itself, but it has a so-called two-type system including a direct drive power source by an external power source and a rechargeable power source charged by the external power source, which have been favored in recent years. Explaining the case of the 2-way type, it is inconvenient to manufacture a wiring board separately because of its versatility and economy. Therefore, a method of manufacturing a wiring board satisfying both of them will be described below.

The rechargeable power source is as described in FIGS. 10 and 13, but the circuit of the 2-way type is shown in FIG.
P ₁ is the so-called adapter side that converts commercial power to the required DC low voltage, fuse TF ₂ , transformer T ₄ , transformer
Diodes D ₁ , D that rectify the AC low voltage of T ₄ to DC low voltage
₂ and its output is supplied to the main body side power supply P ₂ by a plug P ₃ shown by a broken line in FIG. The power supply P ₂ on the main body side is composed of a charging current limiting resistor R ₁ , a rechargeable battery 54, 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 terminal. This main unit power supply P ₂
FIG. 17 shows a state in which the pattern is formed. The pattern itself is the same as in Fig. 13 of the rechargeable power supply described above, and the shape after injection molding is also the same, but the part cut by press working ( (Indicated by) are slightly different.

The major differences are as follows. To those of the 17 views' power supply connection plate 77 the bottom of the 'wiring board 51, hull shaped bottom case 4 plug P ₃ is inserted and connected as shown in FIG. 16'
While the conductive pieces 80, 81 for connecting the connection pins 78, 79 of No. 1 are not cut and left, the one shown in FIG. 13 is such that the conductive pieces 80, 81 are pressed on the power supply connection plate 77. The point is that the leaf springs 82 and 83 are left while being cut and removed, and the leaf springs 82 and 83 are slidably contacted with a plug blade 84 to be inserted into a commercial power outlet.

Therefore, a dedicated wiring board 51,51 'with a rechargeable power source and 2way
It is not necessary to mold each of them, and it suffices to slightly change the cutting position by press working. For example, the punch position of the press die is simply replaced, which is economically excellent.

The point to be noted in the method of manufacturing a wiring board in which the pre-patterned conductive piece is injection-molded with synthetic resin as a mechanical strength structural material and embedded wiring is that the embedded conductive piece is curved by injection molding pressure. The substrate itself is warped due to the distortion or the difference in shrinkage between the conductive piece and the synthetic resin. Therefore, when components such as a wide transformer or a straight rod-shaped rechargeable battery are mounted and mounted, a gap is generated between the substrate and these components, which causes rattling of the components and incompleteness of the soldered portion, which is preferable. Absent.

Therefore, in this product, the surface of the wiring board 51 on which the parts are mounted, that is, the surface 51a shown in FIG. 9 is almost entirely covered with synthetic resin, whereas the surface to which the lead wires of the parts are soldered,
In other words, most of the surface 51b appearing in FIG. 19 is opened, and pressing ribs 87, 88, 89, 90 are provided to prevent the conductive piece 73 from rising, and these pressing ribs 87, 88, 89, 90 are made linear. By extending and intersecting, the warp on the surface 51a side is pulled and absorbed in the opposite direction. Of course, this kind of shrinkage strain can be absorbed by mixing an insulating reinforcing material such as glass fiber into synthetic resin, but since it is insufficient, it has a linear shape with strong mechanical strength,
Further, by using a lattice-shaped arrangement having a large area inside the frame in this manner, it is possible not only to improve the holding performance of the conductive piece 73 at the time of molding but also to prevent displacement due to injection pressure,
Since the conductive piece 73 exposed in the frame is wide, it is possible to prevent thermal deformation of the synthetic resin due to a soldering iron tip when soldering components and partial lifting of the conductive piece 73 due to this thermal deformation. The structure of the power source portion and the method of manufacturing the wiring board described above can be applied to not only electric razors but also rechargeable flashlights and other small electric devices to obtain effects.

In addition, the power supply connection plates 77, 77 'have both end projections 85, 85',
It is temporarily assembled by elastically fitting into the recesses 86, 86 'provided on the inner walls on both sides of the boat-shaped bottom case 4, 4'. 18th example
Shown in the figure.

In FIG. 14, 91 and 92 are sponges and rubber tape-like cushioning materials that elastically press the rechargeable battery 54 and the motor 24, and 93 and 94.
Is a hook-shaped hooking projection for easily attaching the elastic plates 11a and 11b to the main body case 1 for elastically deforming and hooking the notch holes 95 formed in the mating surfaces of the two-divided cases 2 and 3. When the elastic plates 11a, 11b having a circular-arc cross section are deformed by an external force, the hooking protrusions 93, 94 are expanded and deformed so as to be more strongly held, and the deformation amount of the elastic plates 11a, 11b can be compensated. . For this purpose, a gap S is provided between the mating surfaces of the front and back cases 2 and 3 and the elastic plates 11a and 11b as shown in FIG.

[Brief description of drawings]

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 sectional view of a switch portion of the same embodiment, and FIG. 4 is the same switch portion. Operating state explanatory diagram of
FIG. 5 is an explanatory view of an operating state in the case where the switch part is used irregularly, FIG. 6 is a vertical sectional view of a head of the same embodiment, and FIG. 7 is an outer blade holder mounting structure diagram of the same embodiment, 8 is a perspective view of the drive and power source assembly of the embodiment, FIG. 9 is an exploded perspective view of the power source portion of the embodiment, and FIG. 10 is a circuit diagram of the power source portion.
11 is a cross-sectional view of the switch portion of the power supply unit, FIG. 12 is an exploded view of the switch unit, FIG. 13 is a plan view of a wiring board of the power supply unit, FIG. 14 is a cross-sectional view of the main body of the same embodiment, FIG. 15 is a circuit diagram of another embodiment of the power supply portion of the present invention, FIG. 16 is a perspective view of the power supply assembly of the embodiment, FIG. 17 is a plan view of the wiring board of the embodiment, and FIG. FIG. 19 is a bottom vertical sectional view of the same embodiment, and FIG. 19 is a rear side perspective view of the drive power source assembly shown in FIG. 8 of the embodiment of the present invention. 1… Main body case 51 …… Wiring board 73 …… Conductive piece K ₃ …… Projecting piece

Claims (1)

[Claims] 1. A conductive piece (7) having a patterned elasticity.
Wiring board (51) formed by covering and embedding 3) with synthetic resin
In a small electric device which is housed in a main body case (1), a part of the conductive piece (73) is projected to the outside of the wiring board (51) to form a protruding piece (K ₃ ), and the wiring board ( A small electric machine in which the projecting piece (K ₃ ) is elastically contacted with the inner wall of the main body case (1) with the main body case (1) housed in the main body case (1), and the wiring board (51) is positioned by this elastic contact action. machine.