JPH0531758U - Hand part of vacuum cleaner - Google Patents

Abstract

(57) [Abstract] [Purpose] At the base of an electric vacuum cleaner that incorporates an electronic circuit board and its supporting plate, the electronic components are externalized by a side wall integrally formed on the supporting plate without using a separate component. It is an object of the present invention to provide an inexpensive, high-productivity, and small-sized hand portion which is protected from static electricity from the. [Structure] Case bottom 7 integrated with suction passage 6
A support plate 19 that holds the display printed circuit board 17 on the upper surface and the control printed circuit board 18 on the lower surface and is housed in a housing 9 formed by the upper case 8 and the lower case 7 of the case. The side wall 32 covers the entire area of the printed circuit board facing the mating portion and shields the mating portion 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric vacuum cleaner in which a display portion and an operation switch are arranged at a hand portion provided on a suction side of a hose, and these control circuit boards are held by a support plate and incorporated therein.

[0002]

[Prior Art]

 In recent years, vacuum cleaners in which an operating part is provided at the proximal portion of a hose connected between the main body of the vacuum cleaner and the floor nozzle have become the mainstream.

Conventionally, in this type of vacuum cleaner, as shown in Japanese Patent Laid-Open No. 3-29631, a sensor detects the amount of dust passing through an air passage, and the amount is displayed on a hand part. There is one that controls the input of the motor, and the configuration is as shown in FIGS. 6 to 7. That is, in FIG. 6, the hand portion 41 is composed of a lower case 43 integrally formed with the suction passage 42 and an upper case 44 provided with a display section and operation switch section, and a storage section 45 has a display printed circuit board 46 and a control unit. The printed circuit board 47 is held by the support plate 48, and the power supply printed circuit board 49 is directly attached to the lower case 43. Then, with the dust detection sensor 52 including a combination of the light emitting element 50 and the light receiving element 51 provided opposite to each other, the light that reaches the light receiving element 51 from the light emitting element 50 according to the amount of dust passing through the suction passage 42 is detected. The output of the light receiving element 51 changes and the output is input to the control section of the control printed circuit board 47 to control the display element of the display printed circuit board 46 and the rotation control of the fan motor. It was

In addition, as shown in FIG. 7, an insulating plate 54 is provided at a joint portion 53 between the upper case 44 and the lower case 43 in order to protect control components such as a microcomputer from external static electricity. It was inserted by assembling between the printed circuit board and the printed circuit board.

[0005]

However, in the conventional vacuum cleaner, the insulating plate 54 is required to increase the cost, and the insertion work is complicated, which significantly deteriorates the assemblability. It had a poor productivity. If a new function is added, the space occupied by the electronic components becomes even larger, the case and the printed circuit board become closer, and the layout relationship between the mating portion 53 and the electronic components that are sensitive to static electricity is improved, and the mating portion 5 is added. It was not possible to secure sufficient creepage distances and clearances with the structure of the spigot wall in Case 3 above.

The present invention solves the above problems, and an object of the present invention is to provide a handheld portion of an electric vacuum cleaner that is inexpensive, compact, and resistant to external static electricity damage.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the hand part of the vacuum cleaner of the present invention has a case lower part and a case upper part formed integrally with a suction passage, and a storage part formed by the case upper part and the case lower part, and this storage part. The upper surface of the case is provided with a display printed circuit board, and the lower surface is provided with a support plate for holding the control printed circuit board.The supporting plate shields the mating portion above and below the case, and covers the entire area facing the mating portion of the printed circuit board. It is constructed by forming a side wall to cover it.

Further, the mating portion of the case is provided with a spigot wall portion overlapping each other, the side wall covers the inner mating surface of the spigot wall portion, and the side wall end surface and the outer mating surface of the spigot wall portion are aligned with the inner mating surface. The surfaces are arranged in the same direction.

[0009]

[Action]

 With the above-described structure, the hand part of the electric vacuum cleaner of the present invention covers the entire area of the printed circuit board corresponding to the mating part by the side wall, so that electronic components are destroyed by static electricity that enters from the outside through the mating part. Can be prevented. Further, by constructing the spigot wall portion and the side wall provided on the case in combination, a large creepage distance can be obtained in a small space, so that the hand portion can be downsized.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 1 is a main body of an electric vacuum cleaner having a fan motor and a dust collection chamber which are not shown. A hose 4 having a hand portion 3 at its tip is connected to the main body 1 through a connecting portion 2. A floor nozzle 6 is attached to the hand portion 3 via an extension pipe 5.

The hand part 3 is composed of a case lower part 7 and a case upper part 8 which are formed integrally with the suction passage 6, and the case upper part 8 and the case lower part 7 form a storage part 9 and a handle part 10. ing. Further, an insertion portion 12 to which the extension pipe 5 is detachably attached by a buckle 11 is provided on the front end side to be airtight with a packing 13, and a hose 4 is adhesively fixed on the rear end side. Then, as shown by the alternate long and short dash line, a spigot wall portion 15 that overlaps each other is formed at the mating portion 14 between the upper case 8 and the lower case 7, and the front side is fastened with screws 15 and the rear side is hose retainer 15a. It is sandwiched and fixed together.

The housing 9 has a support plate 19 for holding a display printed circuit board 17 on an upper surface and a control printed circuit board 18 on a lower surface, a power supply printed circuit board 20, and a light emitting element 21 and a light receiving element provided opposite to each other. It contains a dust detection sensor 23 consisting of a combination of 22.

As shown in FIG. 2, a display element 24 and a tact switch 25 are mounted on the display printed circuit board 17, and a microcomputer 26 is mounted on the control printed circuit board 18, with their soldering surfaces facing each other. It is held by a claw 27 provided on the support plate 19 and electrically coupled to each other at a short distance by a cable 28.

Further, an opening 29 is formed on the case 8 at a position facing the display element 24, a push button portion 30 is formed at a position facing the tact switch 25, and a display sheet 31 covering them is attached. ..

Next, the structure of the side wall 32 provided on the support plate 19 and the spigot wall portion 15 provided at the joining portion 14 between the case upper portion 8 and the case lower portion 7 according to the present invention will be specifically described.

The side wall 32 is formed so that the electronic components mounted on the display printed circuit board 17 and the control printed circuit board 18 cover the entire area of the case upper part 8 and the case lower part 7 that face the mating part 14. It is also formed so as to cover the electronic components on the printed circuit board 20. As shown in FIG. 3, a leg portion 34 that engages with a holding rib 33 provided on the lower case 7 is integrally formed on a part of the lower portion of the side wall 32. As shown in, the wall thickness is reduced to about 0.3 mm.

Further, the inlay wall portion 15 is composed of a wall 35 formed inside the case lower portion 7 on the inner side and a wall 36 formed on the case upper portion 8 on the outer side, and the side wall 32 is fitted inside the inlay wall portion 15. The surface 37 is covered, and the end surface 38 is sized so that it is located about 5 mm below. The end surface 38 and the outer mating surface 39 are located in the same direction with respect to the inner mating surface 37.

Next, the operation and action of the above configuration will be described. When the fan motor is operated to start sucking dust, the light transmittance in the suction passage 6 changes according to the amount of dust passing therethrough, so that the amount of light reaching the light receiving element 22 from the light emitting element 21 changes, The output voltage of the light receiving element 22 changes. The output voltage from the light receiving element 22 is detected by the microcomputer 26 of the control printed circuit board 18, and the display level control of the display element 24 and the rotation control of the fan motor are performed according to the amount of dust.

The display printed circuit board 17 is arranged on the upper surface so that the display element 24 can be displayed easily by the user and the tact switch 25 is also located at a convenient position.

Further, the control printed circuit board 18 is arranged below the display printed circuit board 17 in a two-layer structure, and the power supply printed circuit board 20 is further provided under the control printed circuit board 17 to eliminate a wasteful space and to accommodate electronic circuit parts. Therefore, the hand portion 3 can be downsized and the operability is good.

Further, since the leg portion 34 provided integrally with the side wall 32 on the support plate 19 is engaged with the time keeping rib 33 provided on the lower portion 7 of the case, the operating force received by the tact switch 25 of the display printed circuit board 17 is received. Since the display printed circuit board 17 and the support plate 19 are not largely bent by being supported by the leg portions 34, sufficient strength can be obtained.

The side walls 32 allow the electronic components such as the microcomputer 26 to have a spatial distance between the upper portion 8 of the case and the lower portion 7 of the case. Sufficient strength can be obtained against the electrostatic damage caused by. Furthermore, since the thickness of the side wall 32 other than the leg portions 34 is thinned to about 0.3 mm, it is difficult for the side wall 32 and the electronic parts to come into contact with each other to deform the electronic parts. Since it can be assembled even with a slight pressure contact when assembled, it can be made compact and can be forced into the shape of a reverse taper, so it is possible to secure a creepage distance by forming a wall in a part that cannot be formed by molding. ..

In addition, when the display printed circuit board 17 and the control printed circuit board 18 are unitized with the support plate 19 and transported, parts such as the light receiving element 22 and the microcomputer 26, which are important parts, have side walls 32, and Since it is hard to break and does not bend or bend, it is possible to provide products with stable quality.

Further, since the end surface 38 and the outer mating surface 39 are located in the same direction with respect to the inner mating surface 37 of the spigot wall portion 15 provided in the mating portion, the inner mating surface 37 to the outer mating surface 39 are Since the defense effect against static electricity can be exerted at a distance including the creepage distance and the space distance from the inner mating surface 37 to the end surface 38, it is possible to reduce the size of the hand portion 3 with a small space.

In the above embodiment, the side wall 32 is formed over the entire area of each printed circuit board, but it is also possible to exclude a place where the electronic component is recessed with a sufficient distance from the mating portion 14, and the point is to say. It suffices if it is formed over the entire area that covers the electronic component arranged at a position facing the mating portion 14.

[0027]

[Effect of the device]

 As is apparent from the above embodiments, according to the present invention, the supporting plate shields the mating portion of the case and forms the side wall covering the entire area facing the mating portion of the printed circuit board. Since it is possible to reliably obtain the strength against static electricity, it is possible to provide a handy portion of an electric vacuum cleaner that is inexpensive, has high productivity, and is excellent in quality.

Further, since the side wall end surface and the outer mating surface of the spigot wall portion are arranged in the same direction with respect to the inner mating surface of the spigot wall portion provided in the mating portion of the case, the hand portion can be made compact and easy to use. A good source of

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the entire structure of a hand portion according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing configurations of the support plate and the printed circuit board.

FIG. 3 is a cross-sectional view showing the relationship between the support plate at the base of the hand and the bottom of the case.

FIG. 4 is a cross-sectional view showing a state of a joint portion between a case upper portion and a case lower portion of the same hand portion.

FIG. 5 is a perspective view showing the overall structure of the electric vacuum cleaner provided with the base portion.

FIG. 6 is a partial cross-sectional view showing an overall configuration of a hand portion of a conventional electric vacuum cleaner.

FIG. 7 is a cross-sectional view showing a state of an insulating plate at the base of the same hand.

[Explanation of symbols]

 3 Hand part 6 Suction passage 7 Lower case 8 Upper case 9 Storage part 14 Fitting part 15 Inlay wall part 17 Display printed circuit board 18 Control printed circuit board 19 Support plate 32 Side wall 37 Inner matching surface 38 Side wall end face

Claims (2)

[Scope of utility model registration request] 1. A case lower part and a case upper part integrally formed with a suction passage, and a storage part formed by the case upper part and the case lower part, a display printed circuit board on the upper surface, and a control printed circuit board on the lower surface. A hand part of an electric vacuum cleaner, comprising: a support plate for holding the support plate; and a side wall that covers the entire area of the support plate facing the mating part of the printed circuit board and that shields the mating part above and below the case. 2. The mating portion of the case is provided with mutually overlapping spigot wall portions, the side wall covers the inner mating surface of the spigot wall portion, and the side wall end surface and the outer mating surface of the spigot wall portion are aligned with the inner mating surface. The hand part of the electric vacuum cleaner according to claim 1, wherein the surfaces are arranged in the same direction.