JPH0632056Y2 - Electric razor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In this invention, in an electric razor, an outer blade holder is detachably attached to a main body case, and this attachment posture is maintained by a lock member. Regarding things.

[Conventional technology]

In a general reciprocating electric shaver, the outer blade holder is detachable from the main body case so that the dust accumulated inside and the inner blade can be cleaned.
In this type of electric shaver, there is one in which an outer blade holder attached to a main body case is held by a lock member so as to prevent the outer blade holder from accidentally falling off (Japanese Utility Model Laid-Open No. 62-78868). As shown in FIG. 10, the lock portion 35 is constantly urged by the spring 36 to the lock posture, and unless the lock member 35 is set in the unlock posture against the spring 36, the outer blade holder 37 is not moved to the main body. Case 38
It cannot be removed from.

[Problems to be solved by the device]

In the above lock mechanism, in order to facilitate the removal operation of the outer blade holder 37, the engagement surface 41 between the lock claw 39 and the engagement protrusion 40 on the outer blade holder 37 side is gently inclined in the removal direction. I am letting you. Therefore, when the outer blade holder 37 is intentionally pulled out with a strong force, the lock claw 39 may be retracted by the component force acting on the engagement surface 41, and the outer blade holder 37 may be pulled out. In particular, when the claw arm of the lock claw 39 is long in the vertical direction, the claw arm is easily bent and deformed, so that the lock claw 39 is likely to come off.

Forcing the outer blade holder 37 to be removed does not pose a problem as much as the left. However, since the lock member 35 is not designed in consideration of excessive pulling, the lock claw 39 and the engaging projection 40 are abnormally worn due to repeated forced pulling, and the outer blade holder 37 is loosened during use. Or, there is a possibility that a problem such as a decrease in the adhesion pressure of the outer blade to the inner blade and the sharpness thereof is extremely lowered may occur. Further, since the lock claw 39 and the engagement protrusion 40 are disengaged abruptly at the time of forcible removal, the dust accumulated inside is scattered around by the impact at the time of removal, and the outer blade holder 37 is There was also a problem that the inner blade was deformed by hitting it strongly.

If the engaging surface 41 can be formed substantially horizontally and the inclination in the pulling direction is eliminated, forced pulling becomes almost impossible. However, in this case, a slight variation in the position dimension of the engagement surface 41 causes backlash in the outer blade holder 37, and the lock claw 39 and the engagement protrusion 40 cannot be engaged with each other. . Furthermore, the outer blade holder 37 cannot be removed until the lock member 35 is completely unlocked, which makes the removal operation difficult.

The present invention has been proposed in view of the above, and an object thereof is to reliably prevent the outer blade holder from being forcibly pulled out by improving the engagement structure of the lock claw and the engagement projection.

[Means for Solving the Problems]

In this invention, as shown in FIG. 1, an auxiliary protrusion 22 and an auxiliary engaging portion 23 are added to each of the engaging surfaces 16a and 21a of the lock claw 16 and the engaging protrusion 21 to form the outer blade holder 7
It has been made possible to reliably prevent the forced removal of. Specifically, the outer blade holder 7 detachably attached to the main body case 1.
And an engagement protrusion 21 provided on the inner surface of the outer blade holder 7,
The main body case 1 has a lock claw 16 that is movably mounted in a lock posture in which the engagement protrusion 21 is in abutting engagement with the main body case 1 and a lock release posture that is disengaged from the engagement protrusion 21. The engaging surface 16a and the engaging surface 16
In the electric shaver in which the engaging surface 21a of the engaging projection 21 with which a is in abutting engagement is formed in a shape that is gently inclined toward the removal direction of the outer blade holder 7, the pair of engaging surfaces One engaging surface 16a of 16a and 21a
An auxiliary projection 22 is partially provided on the auxiliary projection 22. The auxiliary projection 22 has a substantially horizontal retaining engagement surface 24 that is orthogonal to the removal direction of the outer blade holder 7. An auxiliary engaging portion 23 is formed in a recess on the mating surface 21a, and the auxiliary engaging portion 23 is formed in a substantially horizontal shape orthogonal to the removing direction of the outer blade holder 7, and the auxiliary protrusion 2
2 has a retaining engagement surface 25 with which the retaining engagement surface 24 engages in abutting engagement, and the auxiliary protrusion 22 with respect to both the engaging surfaces 16a and 21a.
When the lock claw 16 is moved and operated toward the unlocked posture, the auxiliary protrusion 22 and the auxiliary engagement portion 23
The engagement engagement between the retaining engagement surfaces 24 and 25 between the auxiliary engagement portion 23 and the auxiliary engagement portion 23 is set so as to be disengaged before the engagement engagement between the engagement surfaces 16a and 21a. Is characterized by.

[Action]

The outer blade holder 7 is attached to the main body case 1, and the lock claw 1
When 6 is in the locked position, the engagement surface 16 of the lock claw 16
a and the engaging surface 21a of the engaging protrusion 21 are in abutting engagement with each other, and the auxiliary protrusion 22 and the auxiliary engaging portion 23 are abutting simultaneously through the substantially horizontal retaining engagement surfaces 24 and 25. I am fit. Therefore, even if a removal operation force is applied to the outer blade holder 7, no lateral component force is applied to the retaining engagement surfaces 24 and 25, and component force is not generated on the engagement surfaces 16a and 21a. Since the indispensable movement of the outer blade holder 7 in the detaching direction is prevented by both the retaining engagement surfaces 24 and 25, it is possible to prevent the detachment against the detaching force. Then lock claw 1
When 6 is moved toward the unlocked posture in which it disengages from the engaging projection 21, first, the abutting engagement between the two retaining engagement surfaces 24 and 25 of the auxiliary projection 22 and the auxiliary engaging portion 23 is released. The locking claw 16 and the engagement projection 21 are still in abutting engagement only with the inclined engagement surfaces 16a and 21a. When this state is reached, the outer blade holder 7 is moved from the main body case 1 to both the engaging surfaces 16a and 21a during the moving operation without moving the lock claw 16 to the completely unlocked posture.
It becomes possible to remove smoothly against the engagement of.

〔Example〕

 1 to 6 show an embodiment of the present invention.

In FIG. 3, the electric shaver has a rectangular tube-shaped body case 1
It has a motor 2, a rechargeable battery 3, and a vibrator 4 for changing the rotation of the motor 2 into a reciprocating motion, inside the drive shaft 5 of the vibrator 4 protruding from the upper end surface of the main body case 1. A blade 6 is connected, and a sheet-shaped outer blade 8 mounted on an outer blade holder 7 is brought into close contact with the outer surface of the blade 6. On the front surface of the head portion 1a of the main body case 1 in which the vibrator 4 is incorporated, a knurled blade 9 is supported so as to be capable of undulating. Further, a switch lever 10 for starting the motor 2 and a switching lever 11 for switching the knurling blade 9 up and down are arranged on the outer surface of the main body case 1 below the head portion 1a.

The outer blade holder 7 is fitted onto the head portion 1a, and is retained and held by lock members 13 provided on both left and right sides of the main body case 1. The lock member 13 includes a release button 14, a claw arm 15 standing upward from the release button 14, and a lock claw 1 projecting from an outer surface of an upper end of the claw arm 15.
A compression coil type lock spring 17 which is made of a plastic molded product integrally formed with 6 and is installed inside the release button 14 is always biased to the locked posture.
In the locked position, the release button 14 projects outward from the button hole 18 on the peripheral side of the main body case 1, and the lock claw 16 projects outward from the claw hole 19 on the peripheral side of the head portion 1a. There is.

Corresponding to the above-mentioned lock claw 16, engaging projections 21, 21 are provided so as to face each other on the inner surfaces of the left and right side walls of the outer blade holder 7. The lock claw 16 and the engagement protrusion 21 are formed in a trapezoidal cross section, respectively.
The engaging surfaces 16a and 21a of the are gently inclined toward the direction of removing the outer blade holder 7.

4 and 5, in order to prevent the outer blade holder 7 from being forcibly pulled out, the auxiliary projection 22 is provided on the engagement surface 16a on the lock claw 16 side, and the engagement surface 2 on the engagement projection 21 side is provided.
An auxiliary engaging portion 23 that engages with the auxiliary protrusion 22 is formed in a recess in 1a. The auxiliary projection 22 is formed locally near the lower end of the engaging surface 16a in the inclination direction, and locally protrudes only in the center of the engaging surface 16a in the front-rear width direction. It has a face 24. Further, the auxiliary engaging portion 23 is formed by recessing the engaging surface 21a in a triangular shape in cross section, leaving both ends in the front-rear direction, and a substantially horizontal retaining engagement surface 25 on the inner bottom thereof.
Is provided.

As shown in FIG. 1, in a state where the outer blade holder 7 is mounted on the main body case 1, the locking claw 16 and the engaging projection 21 are in contact with each other at their engaging surfaces 16a, 21a, and at the same time. The retaining projections 24 and 25 of the auxiliary protrusion 22 and the auxiliary engaging portion 23 are in contact with each other. In this state, when the removal force acts on the outer blade holder 7, the engaging surfaces 16a and 21
At a, a component force in the direction of immersing the lock claw 16 tends to act. However, the auxiliary protrusion 22 and the auxiliary engaging portion 2
Since it is in contact with 3 via the substantially horizontal retaining engagement surfaces 24 and 25, it prevents movement of the outer blade holder 7 in the removal direction, which is essential for generating the component force, and actually The lock claw 16 does not sink. In addition, the retaining engagement surface 24
In No. 25, no component force is generated in the direction in which the lock claw 16 is retracted. Therefore, the lock claw 16 and the engagement protrusion 2
As long as 1 is not destroyed, the outer blade holder 7 is attached to the head 1a.
It becomes impossible to remove from, and it is possible to reliably prevent the excessive removal.

When the release button 14 is pushed in, as shown in FIG. 6, the retaining engagement surface 24 of the auxiliary protrusion 22 extends from the protrusion end of the auxiliary engagement portion 23.
When the lock is released, the locking claw 16 and the engagement projection 21 are brought into contact with each other only between the engagement surfaces 16a and 21a formed of inclined walls, so that a lateral component force acts on the engagement surface 16a. The outer blade holder 7 can be easily removed. That is, it is possible to remove the outer blade holder 7 without having to make the entire lock pawl 16 completely retract into the pawl hole 19.

[Another embodiment example]

Contrary to the above embodiment, even if the auxiliary protrusion 22 is provided on the engaging surface 21a of the engaging protrusion 21 and the auxiliary engaging portion 23 is provided on the engaging surface 16a of the lock claw 16, the same function can be achieved. .

As shown in FIG. 7, auxiliary protrusions 22 are provided on both ends of the engagement surface 16a in the width direction, and the auxiliary engagement portion 23 is similarly provided on the engagement surface 21a.
You may form a recess in the width direction both ends of a.

Further, as shown in FIG.
It can also be formed partially on the upper end side of the slope of 6a. In this case, as shown in FIG. 9, if the notch 27 corresponding to the protrusion 22 is provided in the auxiliary engaging portion 23, the entire lock pawl 16 is completely inserted in the pawl hole 19 as in the above embodiment. The outer blade holder 7 can be easily removed even if the outer blade holder 7 is not immersed.

The lock members 13 may be provided on only one of the left and right peripheral walls of the main body case 1, and the pair of right and left locks need not necessarily be provided.

[Effect of device]

As described above, in the present invention, in addition to the lock claw 16 and the engagement protrusion 21, these engagement surfaces 16a and 21a are provided.
The auxiliary protrusion 22 and the auxiliary engaging portion 23 are provided on the auxiliary protrusion 22.
And the auxiliary engaging portion 23 are substantially horizontal retaining engagement surfaces 24, 25
Since it is possible to reliably prevent the outer blade holder 7 from moving in the removal direction by abutting through it, it is possible to eliminate the component force in the unlocking direction acting on the lock claw 16 due to the removal force. However, it is possible to reliably prevent the outer blade holder 7 from being forcibly removed. As a result, it is possible to prevent abnormal wear of the lock claw 16 and the engagement protrusion 21 due to excessive removal, and to eliminate problems such as rattling of the outer blade holder 7 and deterioration of sharpness.

In this way, when the lock claw 16 is in the locked posture, the outer projection holder 22 and the auxiliary engagement portion 23 are engaged with each other to surely prevent the outer blade holder 7 from being forcibly pulled out. During the moving operation toward the releasing posture, both the retaining engagement surfaces 24.2 of the auxiliary protrusion 22 and the auxiliary engaging portion 23.
The abutting engagement between the five is released first. In this case, only the remaining engagement surfaces 16a and 21a come into contact engagement with each other, and the outer cutter holder 7 can be operated without further moving the lock claw 16 toward the unlocked posture.
Can be easily removed. That is, both the retaining engagement surfaces 24 and 25 of the auxiliary protrusion 22 and the auxiliary engaging portion 23 are formed in a part of the both engagement surfaces 16a and 21a, and the both engagement surfaces 16 are formed.
Since a and 21a are slanted, lock hand 1 with one hand
Even when the outer blade holder 7 is picked up with the other hand while the lock 6 is being unlocked, the outer blade holder 7 is not forced to be removed as in the conventional case, and the various drawbacks associated with the conventional forced removal are completely eliminated. It can be resolved.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is an enlarged sectional view of a portion A in FIG. 3, FIG. 2 is a sectional view taken along the line BB in FIG. 1, and FIG. FIG. 4 is a perspective view of a lock claw, FIG. 5 is a perspective view of an engaging projection, and FIG. 6 is a cross-sectional view corresponding to FIG. 1 showing a detached state of an outer blade holder. It is a figure. FIG. 7 is a sectional view corresponding to FIG. 2 showing another embodiment. 8 and 9 show still another embodiment example, FIG. 8 is a perspective view of a lock claw, and FIG. 9 is a perspective view of an engaging protrusion. FIG. 10 is a sectional view of an essential part of an electric shaver showing a conventional example. 1 ... Main body case, 7 ... Outer blade holder, 13 ... Lock member, 16 ... Lock claw, 16a ... Engaging surface, 21 ... Engaging protrusion, 21a ... Engaging surface, 22 ... Auxiliary Protrusions, 23 ... Auxiliary engaging portion, 24/25 ... Retaining engagement surface.

Claims (1)

[Scope of utility model registration request] 1. An outer blade holder (7) detachably attached to a body case (1), an engagement protrusion (21) provided on an inner surface of the outer blade holder (7), and a body case (1). A locking claw (16) mounted so as to be movable in an engaging and engaging manner with respect to the engaging projection (21) and a unlocking attitude that is disengaged from the engaging projection (21). The engaging surface (16a) of the claw (16) and the engaging surface (21a) of the engaging projection (21) with which the engaging surface (16a) is in abutting engagement with each other make it possible to remove the outer blade holder (7). In the electric shaver that is formed so as to be gently inclined toward the disengagement direction, an auxiliary protrusion (22) is partially formed on one engagement surface (16a) of the pair of engagement surfaces (16a ・ 21a). This auxiliary protrusion (22)
Has a substantially horizontal retaining engagement surface (24) orthogonal to the removal direction of the outer blade holder (7), and the other engagement surface (21a) is formed with a recessed auxiliary engagement portion (23). This auxiliary engaging portion (23) is formed in a substantially horizontal shape orthogonal to the removing direction of the outer blade holder (7), and the auxiliary protrusion
The retaining engagement surface (24) of (22) has a retaining engagement surface (25) for abutting engagement, and the auxiliary protrusion (22) with respect to the both engaging surfaces (16a, 21a). The auxiliary engagement portion (23) is a retaining engagement between the auxiliary protrusion (22) and the auxiliary engagement portion (23) when the lock claw (16) is moved toward the unlocked posture. An electric razor characterized in that the abutting engagement between the surfaces (24, 25) is positioned so as to be disengaged before the abutting engagement between the two engaging surfaces (16a, 21a).