JPS6241559Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to improving the motor mounting structure of small electric appliances such as electric shavers and electric toothbrushes. To provide a structure that can always fix a motor in a constant posture with good balance regardless of variations.

Conventionally, when attaching a motor to this type of small electrical equipment, a structure has been provided in which the motor is clamped and held between a partition wall below the motor housing chamber and a top cover attached above the case body. However, if no measures are taken against variations in the length of the installed motor, and the motor is too long or too short than the standard, the motor cannot be fixed in a constant position, for example, the output shaft at the top of the motor There was also a risk that the motor would be fixed in an eccentric state, or that the motor could not be fixed completely, causing it to wobble and making the device unable to perform its functions.

Therefore, as shown in Japanese Utility Model Application Publication No. 53-45407, there is an attempt to obtain a vibration-proofing effect by separately disposing an elastic vibration-proof plate such as rubber between the motor and the case, but the number of parts is large. This has the disadvantage of increasing costs.

Therefore, in the present invention, the lower end of the electric motor is supported by a support part that is integrally formed from the case body and extends toward the inside of the case body, and the upper end of the motor is fixed at the outer periphery above the case body. In the structure in which the motor is supported by a top cover and is clamped and fixed between the support part and the top cover,
The upper cover has a motor contacting part protruding from the surface facing the top surface of the motor, and the top surface of the motor is brought into contact only with the corresponding contacting part, and the periphery of the corresponding contacting part is connected to the top surface of the motor. This invention attempts to eliminate the above-mentioned drawbacks by forming a void in the thin-walled portion to give it elasticity, and by integrally forming the outer peripheral portion of the top cover as an enlarged portion with a large wall thickness relative to the thin-walled portion. be.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The drawings illustrate a battery-powered electric shaver. A rotating shaft 2 that is driven by a built-in electric motor is protruded from the upper end of the case body 1, and a rotary shaving blade block 3 that is interlocked and connected to the rotating shaft 2 is mounted on the case body. It has become fixed.

Figures 1 and 2 are longitudinal cross-sectional views of the rotary shaving blade block 3 installed on the case body.The case body has an electric motor 5 built in at the top, and an opening at the bottom with a battery on the bottom. It has a battery storage chamber 7 which is closed with a lid 6, and two AA type dry batteries 8, 8' are stored in this storage chamber 7 in a left-right parallel arrangement.

The built-in electric motor 5 has a positioning protrusion 10 protruding from the center of its lower end, and the protrusion 10 is engaged with a recess 9 provided in a partition wall-like support 11 between the motor housing chamber and the battery housing chamber 7. Enter. This support portion 11 does not have to be in the shape of a partition wall, but may have any shape as long as it projects integrally from the inner surface of the main body case 1 and supports the lower surface of the motor 5. Then, the output shaft 12 is protruded from the upper end of the motor 5, and the shaft support boss portion 13 of the output shaft 12 is fixed to the upper lid 1 by the screw fixing portion P on the case body.
4, and supports the upper surface of the motor 5 with the motor contact portion 4 that protrudes along the periphery of the boss portion through hole 19 on the lower surface of the upper lid 14;
Furthermore, the peripheral edge of the motor contact portion 4 is made thin so as to have appropriate elasticity, and the thin portion 33 is used to hold the motor 5 in a constant posture and elastically between the partition wall-like support portion 11. Hold. At this time, the top surface of the motor 5 is pressed only by the motor contact portion 4 of the top cover 14, and therefore a slight gap 18 is formed between the periphery of the motor contact portion of the top cover 14 and the top surface of the motor 5. Ru. Further, the position of the screw fixing portion P is at the outer periphery of the upper lid 14, and the outer periphery is integrally formed with the thin wall portion 33 as an enlarged portion 32 having a large wall thickness. The motor 5 has a partially chamfered exterior and is prevented from rotating between the motor 5 and the main body case 1. A cylindrical shaft 15 is fixed to the motor output shaft 12, and the rotating shaft 2 is attached to the cylindrical shaft 15 so that it cannot rotate relatively but can slide up and down, so that the rotating shaft 2 can be removed upwardly. It has a structure in which a blocking guide member 17 is attached to the case body 1 together with the upper cover 14.

The rotary shaving blade block 3 has an inner blade accommodating chamber 24 at the upper part of the inside of the casing 23, and the inner blade 2 is housed here.
A rotor 26 supporting a rotor 5 is housed therein, and a holder 28 supporting a porous screen-like outer cutter 27 is screwed to the upper end of the outer wall 29 of the inner cutter storage chamber 24, and the outer cutter 27 is attached to the inner cutter 25. There is a sliding contact.

This shaving blade block 3 is tightened and fixed to the upper end of the case body 1 via a bayonet type coupling mechanism 30, and in this state, the lower end of the shaft 31 of the rotor 26 is inserted into the upper end of the rotation shaft 2, and the rotor shaft 31 The protruding pin 21 engages with the engagement groove 22 of the rotating shaft 2, and power is transmitted from the rotating shaft 2 to the rotor shaft 31. Note that even if the pin 21 of the rotor shaft 31 and the engagement groove 22 of the rotation shaft 2 are out of phase when the shaving blade block 3 is installed, the rotation shaft 2 will resist the spring 16 and escape downward. When the rotation of the rotation shaft 2 matches the phases, the rotation shaft 2 is lifted up and properly engaged with the rotor shaft 31.

According to the above configuration, even if the length l of the attached motor (solid line) is slightly different from the length L of the standard motor (dotted chain line) as shown in FIG. Since the periphery of the contact portion 4 has appropriate elasticity, when the motor contact portion 4 is in contact with the upper surface of the motor 5, the periphery of the motor contact portion 4 of the upper cover 14 is elastic with the screw fixing portion P as a fulcrum. The air gap 18 serves to prevent contact with the upper surface of the motor 5, so that the motor can always be fixed in a constant position regardless of variations in the length of the attached motor. Furthermore, since the screw fixing part P is an enlarged part 32 that is thicker than the thin wall part 33, the strength of the screw fixation with the case body 1 is improved, so that only the top cover 14 can be used.
The motor 5 can be supported elastically well.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention, FIG. 2 is a longitudinal sectional side view of the embodiment, and FIG. 3 is a sectional view of a main part of the embodiment. 1...Case body, 4...Motor contact part, 5...
...Motor, 11...Support, 14...Top lid, 18
...Gap between the top surface of the motor and the top cover, 32... Enlarged portion, 33... Thin wall portion.

Claims (1)

[Scope of utility model registration request] The lower end of the electric motor 5 is supported by a support portion 11 formed integrally extending inward from the case body 1, and the upper end of the motor 5 is fixed at its outer peripheral portion above the case body 1. In the structure in which the motor 5 is supported by a top cover 14 and is clamped and fixed between the support portion 11 and the top cover 14, the top cover 14 has a motor contact portion 4 on a surface facing the top surface of the motor 5. The upper surface of the motor is brought into contact only with the corresponding contact portion 4, and the peripheral edge of the corresponding contact portion 4 forms a gap 18 with the upper surface of the motor 5 and is made into a thin wall portion 33 to provide elasticity. A motor mounting structure for a small electric device, characterized in that the outer peripheral portion of the upper cover 14 is integrally formed with the thin wall portion 33 as an enlarged portion 32 having a large wall thickness.