JPH02936Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to small electric appliances such as electric shavers and electric toothbrushes, and is an improvement in the structure for attaching and detaching the cap to the head case on the main body.

For example, in an electric shaver as shown in FIG. 1, when the cap 4 is placed on the head case 3 on the main body 1, the protrusions 8, 8 provided on the lower inner surfaces of the left and right side walls 7, 7 of the cap 4 are exposed. The cap 4 is fitted into the left and right recesses 6, 6 of the head case 3, respectively, to prevent the cap 4 from accidentally coming off from the head case 3.

However, conventionally, as shown in FIG. 6, when dimensions are set so that the lower end opening periphery of the cap 41 tightly fits into the vertical surface 32 of the lower outer periphery of the head case 31, it is difficult to attach the cap 41. In addition to this, the fit between the protrusion 81 and the recess 61 is so tight that even if the cap 41 is pressed and deformed from the direction indicated by the symbol F in FIG.
Since the vertical surface 32 indicated by the symbol P comes into contact with the cap 41 at a position slightly above the lower opening periphery, the pressing force F does not act as a force pushing up the cap 41, and therefore it actively moves upward while pressing. Cap 41 unless the two actions of pulling it up are given.
cannot be easily removed from the head case 31.
Therefore, when the cap 41 is completely covered with the head case 31, a slight gap is provided almost all around the circumference between the outer peripheral surface of the head case 31 and the lower end opening periphery of the cap 41.
The shape of the periphery of the lower end opening is deformable during attachment and detachment, and the dimensions are set so that the protrusion 81 and the depression 61 can be appropriately engaged. Therefore, the cap 41 placed over the head case 31 tends to wobble and is not securely fixed. Also head case 3
From 1 onwards, there was a tendency for cap 41 to become easily detached unexpectedly.

Focusing on this fact, this invention aims to make it possible to firmly fit the cap onto the head case without shaking it, and to also make it easy to remove the cap. do.

The details will be explained below based on the drawings.

FIG. 1 shows an example of an electric razor, and on the razor body 1 there are reciprocating razor blades 2 at the upper end.
This head case 3 has a
A cap 4 can be detachably attached to the cap.

The head case 3 is constricted in the middle between the top and bottom,
The shape of the outer circumferential surface of the lower half is such that the front and rear surfaces are formed into upwardly tapered inclined surfaces 5, 5 that gently slope upward from the lower end, and there are recesses 6, 6 at the left and right lower ends.
It has come to have a

The cap 4 is an elastically deformable plastic molded product with an open bottom only, and has an irregular elliptical shape with the lower end opening periphery protruding from the front and back to match the shape of the head case 3, and having an arcuate shape and straight sides on the left and right sides. The left and right side walls 7, 7 have protrusions 8, 8 on the inner surfaces of the lower ends thereof.

In Figures 2 to 4, when the cap 4 is completely covered with the head case 3, the head case 3
The lower end opening periphery of the cap 4 is tightly fitted to the lower end outer peripheral surface of the cap 4, and the protrusions 8, 8 are fitted into the opposing recesses 6, 6, respectively.
is held so that it does not accidentally come off from the head case 3. In this state where the cap is attached, the central part of the front and rear side walls 9, 9 of the cap 4 and the head case 3 are connected to each other.
A certain gap g is formed between the two.

When removing the cap 4 from the head case 3, as shown in FIG. 5, the center portions of the front and rear side walls 9, 9 of the cap 4 are pushed inward with a force F to dent them. Then, since the front and rear inclined surfaces 5, 5 of the outer peripheral surface of the head case 3 are gently inclined with respect to the cap 4, this force F is applied to the front and rear side walls 9, 9.
Component forces F ₁ and F ₂ act on the lower end of the cap, especially at its inner edge, depending on the degree of inclination of the inclined surfaces 5 and 5, and this component force F ₁ , that is, the force in the direction of pushing up the cap 4, pushes the cap 4 toward the inclined surface 5. , 5. At the same time, the lower edges of the front and rear side walls 9, 9 are moved inward by an amount indicated by t in the figure, and at this time, the front and rear walls of the head case 3 are formed into a protruding arcuate and gently sloped upper edge. Because it is an inclined surface of the basin, the most protruding position of the arc is in contact, but even if it is moved inward by the amount indicated by t in the figure, both sides of the most protruding position of the arc are in contact with each other. In this case, a gap occurs between the lower end opening periphery of the cap 4 and the gap increases as the dimensions are brought closer together.
For this reason, the deformation of the cap 4 becomes easier, and this deformation extends to the lower edges of the left and right side walls 7, 7, causing the lower edges of the left and right side walls 7, 7 to bulge laterally outward, causing the engagement between the protrusion 8 and the recess 6. becomes loose. Therefore, if you increase your force in the gripping direction while gripping the front and rear side walls 9, 9, the cap 4 will automatically move upward along the narrow slopes 5, 5 that are gently sloped with respect to the cap 4. With this movement, the recess 6 and the protrusion 8 are easily disengaged, and the cap 4 can be automatically removed.

In addition, a recess 6 is made on the side of the cap 4, and a recess 6 is made on the side of the head case 3.
A protrusion 8 may be provided on each side.

Further, the cap 4 may be formed of a thin aluminum plate as long as it is made of an elastically deformable material.

Furthermore, when the cross-sectional shape of the head case 3 and the cap 4 are closely fitted, the most remarkable separation effect can be obtained when the cross-sectional shape is an irregular oval shape. Any shape may be used as long as the engaging portion is linear and the fitting position of the cap 4 and the inclined surfaces 5, 5 exists in a direction orthogonal to the fitting direction of the recesses 6, 6 and the protrusions 8, 8.

According to the present invention as described above, the cap 4
The dimensions are set so that the lower end opening periphery of the cap 4 tightly fits into the outer peripheral surface of the head case 3 when the cap 4 is placed over the head case 3 from above.
In particular, the front and back of the outer peripheral surface of the head case 3 are covered with caps 4.
When the cap 4 is attached, the lower ends of the front and rear side walls 9, 9 are guided by the inclined surfaces 5, 5 and fitted. The cap 4 can be inserted and installed smoothly. In addition, the front and rear side walls 9, 9 of the cap 4 bulge outward to ensure a close fit, and act to draw the left and right side walls 7, 7 of the cap 4 inward.
The recesses 6 and protrusions 8 provided at the lower ends of the left and right side walls 7, 7 and the left and right positions on the outer circumferential surface of the head case 3 are securely engaged, and the cap 4 is not loosely attached to the head case 3. It can be fixed securely to prevent it from coming off without sticking.

Moreover, when removing the cap 4 from the head case 3, if the center portions of the front and rear side walls 9, 9 of the cap 4 are pushed inward and concave, the front and rear side walls 9, 9 of the cap 4 will be retracted from the inclined surfaces 5, 9. The lower edges of the front and rear side walls 9, 9 move inward, and at the same time the lower edges of the left and right side walls 7, 7 of the cap 4 bulge laterally outwardly, forming the above-mentioned depressions 6 and protrusions 8.
automatically disengages. Therefore, by simply pinching and pressing the front and rear side walls 9, 9 of the cap 4, the cap 4 can be lifted up and removed, and the engagement of the protrusions and recesses is also automatically released, so the cap 4 can be easily removed from the head case 3. It has the advantage of being removable.

[Brief explanation of the drawing]

The drawings illustrate an electric shaver, which is one of the small electric devices according to the present invention. Fig. 1 is an external perspective view, Fig. 2 is a longitudinal sectional front view of the main part with the cap attached, and Fig. 3 is the main part. Sectional side view, No. 4
The drawings are a sectional view taken along the line A--A in FIG. 2, FIG. 5 is a longitudinal sectional side view of the main parts for explaining the operation when removing and removing the cap, and FIG. 6 is an explanatory view of the operation when removing and removing the conventional cap. 1... Main body, 2... Shaving blade, 3... Head case, 4... Cap, 5... Inclined surface, 6... Recess, 7... Left and right side walls of cap, 8... Protrusion, 9
...Front and rear walls of the cap, g... air gap.

Claims (1)

[Scope of utility model registration request] In order to removably cover the head case 3 on the main body 1 with an elastically deformable cap 4 having an open bottom surface, the bottom opening periphery of the cap 4 is shaped like an arc at the front and back and straight at the left and right sides. At the same time, the head case 3 side has the same shape as above so that the peripheral edge of the lower end opening tightly fits on the outer peripheral surface of the head case 3, and the left and right positions of the outer peripheral surface of the head case 3 and the cap 4 are A recess 6 and a protrusion 8 are provided on the inner surfaces of the lower ends of the left and right side walls 7, 7, respectively, to fit and engage with each other.
At the part where the lower end opening periphery of the cap 4 comes into contact, upwardly tapering slopes 5, 5 are formed that are gently inclined with respect to the cap 4, and the head case 3 and the cap 4 placed over it are formed with inclined surfaces 5, 5. A small electric device characterized in that a gap g is formed between the front and rear side walls 9, 9 so that the center portions of the front and rear side walls 9, 9 can be recessed inward.