JPH022045Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention is applicable to electric knife sharpeners, electric razors,
Concerning the improvement of various small electric devices such as electric toys.

[Conventional technology]

Conventionally, an electric motor installed in this type of small electrical equipment is generally fixed to a mounting base with screws.

[The problem that the idea attempts to solve]

However, in the above-mentioned small electric devices, many parts are often arranged close together in order to use the internal space of the main body case as effectively as possible, so the space for installing the motor is narrow and it is difficult to install or remove the motor using screws. It had the disadvantage of being troublesome and requiring a lot of work.

This invention focuses on this fact and aims to provide a small electric device with a motor mounting structure that allows the electric motor to be easily installed or removed without using any tools, and that can be reliably positioned and fixed in the installed state. .

[Means to solve the problem]

The present invention is based on a small electric device having a main body case 1, a motor mounting base 10 disposed inside the main body case 1, and an electric motor 4, as shown in FIGS. 5 and 6, for example. do. Furthermore, the electric motor 4 has bearing bosses 16 and 17 protruding from both end faces in the axial direction. The motor mounting base 10 is
A pair of support arms 12, 13 facing each other with an interval corresponding to the length in the axial direction of the electric motor 4, and a retaining piece 15 disposed on one side between both the support arms 12, 13. have The support arms 12, 13
Recessed notches 18 and 19 corresponding to the bearing bosses 16 and 17 are provided on the same side edge facing the retaining piece 15, respectively. The retaining piece 15 has elasticity that acts in the direction of the support arms 12 and 13. Thus, the bearing bosses 16, 17 of the electric motor 4 are fitted into the recessed portions 18, 19 of the support arms 12, 13.
In the locked state, the support arms 12 and 13 sandwich both end surfaces of the electric motor 4 in the axial direction, and the retaining piece 15 elastically contacts the outer periphery of the electric motor 4 to prevent the bearing boss 16, 15 is a concave notch 18,
19.

[Effect]

In such a case, the electric motor 4 should be
The bearing bosses 16 and 17 are attached to the recessed notches 18 and 19 by strongly pushing them between the retaining presser piece 15 and the support arms 12 and 13 while elastically deforming the bearing bosses 16 and 17. In this installed state, the electric motor 4 is held between the support arms 12 and 13, so that it does not wobble in the axial direction, and is pressed by the retaining piece 15, so that it can move in the radial direction. There will be no more rattling.

Moreover, the electric motor 4 resists the elasticity of the retaining retaining piece 15 to connect the retaining retaining piece 15 and the support arm 1.
It can be extracted from between 2 and 13.

[Effect of idea]

According to the small electric device of the present invention, the main body case 1
A recessed part 18 into which the bearing bosses 16 and 17 of the electric motor 4 engage,
a pair of support arms 12 and 13 having 19, and a retaining piece 1 that elastically contacts the outer peripheral surface of the motor 4;
5, it is extremely easy to install the electric motor 4 in a narrow motor installation location in the main body case 1 or remove it for replacement or repair with one touch without using any special tools such as a screwdriver. The motor can be installed in a stable and reliable state without rattling. Furthermore, the bearing bosses 1 with extremely high center positioning accuracy of the electric motor 4 are provided in the recessed portions 18 and 19 of the support arms 12 and 13.
6 and 17, it is possible to easily mount the electric motor 4 with good center position accuracy without modifying the electric motor 4 by providing a special engaging portion or the like.

〔Example〕

Hereinafter, a case where an embodiment of the present invention is applied to an electric knife sharpener will be described based on the drawings.

In Figures 1 to 3, reference numeral 1 denotes a main case formed by screwing together upper and lower plastic cases 1a and 1b, and the left side into which the blade of a cutlery A such as a kitchen knife or knife is inserted into the upper right side. Alternatively, a set of two slits 2 for right side polishing is provided, and a rotary grindstone 3 for rough polishing, a rotary whetstone 3 for finishing, and an electric motor 4 for driving them are arranged on the left and right sides of the slits 2, and the main body case Four dry batteries 5 are housed in the left internal space of 1. A push button switch 6 for starting the motor 4 is provided on the front surface of the upper case 1a, and a tray 7 for abrasive powder and a lid 8 for inserting and removing batteries are each removably attached to the lower case 1b.

The electric motor 4 has bearing bosses 16 and 17 protruding from the center portions of both end faces thereof.
A double-shaft protruding type is used in which a rotating shaft 9 is projected through the rotating shaft 7, and rotary grindstones 3, 3 are inserted and fixed to the shaft ends of the rotating shaft 9. The electric motor 4 is fixed to a motor mount 10, and the motor mount 10 is supported on the upper wall inside the main body case 1 so as to be movable left and right.

In Figures 3 to 5, motor mounting base 1
0 is a plastic molded product, in which a pair of left and right support arms 12 and 13 that contact both end surfaces in the axial direction of the electric motor 4 are placed on the left and right ends of the lower surface of a substantially rectangular plate-shaped substrate 11, facing each other and facing downward. The supporting arms 12 and 13 are arranged in series with a connecting wall 14, and a tongue-like retaining presser piece is provided at a rear side position between the supporting arms 12 and 13 and is elastically deformable in the front-back direction. 15 are arranged in a downwardly protruding manner. An electric motor 4 is mounted on each rear edge of both support arms 12 and 13.
Semicircular recesses 18 and 19 are respectively formed to fit into the bearing bosses 16 and 17 from the rear side. Therefore, the electric motor 4 is supported by both support arms 12,
13 and forcefully push the retaining presser piece 15 backward while elastically deforming it, the support arm 1
Both bosses 16, 17 are in the recessed parts 18, 19 of 2, 13.
are respectively locked, and these support arms 12, 13
The electric motor 4 is mounted on the motor mount 10 while being positioned and fixed in the front, rear, left, right, and up and down directions by the retaining pieces 15. Further, in order to remove the electric motor 4 from the motor mount 10, the electric motor 4 may be strongly pulled out obliquely toward the tip side of the retaining presser piece 15.

When the electric motor 4 is mounted on the motor mount 10, the notch 20 formed at the periphery of one end of the electric motor 4 engages with the protrusion 21 provided at the base of one of the support arms 12. 4. Rotation of itself is prevented.

In FIG. 6, hanging locking projecting walls 22 are provided at the four corners of the lower surface of the motor mounting base 10, and these projecting walls 22 are connected to a pair of front and rear support plates screwed to the inner surface of the upper wall of the main body case 1. The mounting base 10 is supported on the upper surfaces of the projecting walls 22 and the support plates 23 and 24, with a ball 25 interposed between each projecting wall 22 and the support plates 23 and 24, and is suspended from the support plates 23 and 24 so as to be able to roll freely in the left and right direction. Lower and support. A guide pin 26 is provided upright on the upper surface of the motor mount 10, and a guide rib 27 is provided on the inner surface of the upper wall of the main body case 1, into which the pin 26 engages. Main case 1
A ball 28 is provided between the inner surface of the upper wall and the motor mount 10 to prevent the motor mount 10 from floating up and to smooth the left and right movement.

A pair of left and right leaf springs 2 are installed on the inner surface of the upper wall of the main body case 1.
9 and 29 are provided with initial deformation so that their free ends approach each other, and these leaf springs 29 and 2
A pin 30 protruding from the upper surface side of the motor mount 10 is engaged between the free ends of the motor mount 9, so that the motor mount 10 is held at the center position of the left and right movement range under normal conditions. 10 is movable left and right against springs 29, 29. Further, in the normal state, the grindstones 3, 3 are each largely exposed in the slit 2, and when the cutter A is inserted, the grindstones 3, 3 are elastically pressed together with the electric motor 4 and the motor mount 10 and retreat.

In the above embodiment, a movable motor mount 10 is used to move the motor 4, but in the case of a small electrical device such as an electric razor where the electric motor is fixed, the main body case of this is used. The support arms 12, 13 and retaining piece 15 can be directly protruded from the inner surface as the motor mounting surface.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of a knife sharpener showing an example of a small electric device according to this invention, and Fig. 2 is a front view.
3 is a sectional view taken along the line -- in FIG. 2, FIG. 4 is a longitudinal sectional front view of the polishing section, FIG. 5 is a longitudinal sectional side view of the polishing section, and FIG. 6 is an exploded perspective view of the motor mounting portion. 1... Main body case, 4... Electric motor, 10...
...Motor mounting base, 12, 13...Support arm, 1
5... Retaining piece, 16, 17... Bearing boss,
18, 19...Concave cutout.

Claims (1)

[Scope of Claim for Utility Model Registration] A small electric device comprising a main body case 1, a motor mount 10 disposed inside the main case 1, and an electric motor 4, wherein the electric motor 4 is oriented in the axial direction thereof. Bearing bosses 16 and 17 protrude from both end faces of the motor mount 10, and a pair of support arms 12 and 13 facing each other with an interval corresponding to the axial length of the electric motor 4; The bearing boss 16 is provided on the same side edge facing the retaining piece 15 of both the support arms 12 and 13. Recessed notches 18 and 19 corresponding to the support arms 17 and 17 are respectively provided, and the retaining presser piece 15 has elasticity that acts in the direction of the support arms 12 and 13. With the bearing bosses 16 and 17 of the electric motor 4 locked, the support arms 12 and 13 sandwich both end surfaces of the electric motor 4 in the axial direction, and the retaining piece 15 is elastically attached to the outer periphery of the electric motor 4. A small electric device characterized in that the bearing bosses 16 and 17 are pressed into the recessed notches 18 and 19 by abutting each other.