JP3557068B2 - Electric razor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric shaver having an elongated shape as a whole and having a comb blade at a tip.
[0002]
[Prior art]
FIG. 1 is an exploded perspective view of a conventional electric shaver. The electric shaver shown in this figure is provided with a comb blade 14 at the tip of the elongated case 1. The comb blade 14 is provided in a state where a fixed blade 14A that does not reciprocate and a movable blade 14B that reciprocates are stacked, and the movable blade 14A reciprocates to cut hair. If there is a gap between the movable blade 14B and the fixed blade 14A, the hair cannot be cut efficiently, so the electric razor shown in the figure slides by elastically pressing the movable blade 14B against the fixed blade 14A with the leaf spring 17. I can do it. Since the leaf spring 17 presses the movable blade 14B against the fixed blade 14A, the illustrated electric razor clamps the leaf spring 17 between the blade base 1S and the movable blade 14B. Three blade springs 17, a movable blade 14B, and a fixed blade 14A are laminated on the blade base 1S, and an E-ring 27 is inserted into the tip of a rod 26 penetrating these, and the blade base 1S is mounted on the blade base 1S.
[0003]
The movable blade 14 </ b> A has a rear end connected to the connecting rod 13, connects the connecting rod 13 to the eccentric gear 12, and reciprocates via the connecting rod 13. The connecting rod 13 has a connection protrusion 13A at the tip, and the connection protrusion 13A is fitted into the connection hole 22 of the movable blade 14B and connected.
[0004]
[Problems to be solved by the invention]
In the electric razor having the above structure, the movable blade is elastically pressed against the fixed blade by the leaf spring, so that the gap between the movable blade and the fixed blade can be reduced. However, in the electric razor of this structure, it is extremely difficult to make the movable blade and the fixed blade have no gap, in other words, make the movable blade lightly slide and reciprocate in a well-cut state. This is because it is necessary to strongly press the movable blade against the fixed blade with a leaf spring in order to keep the movable blade in close contact with the fixed blade and slide the movable blade so that there is no gap between them. If the movable blade and the connecting rod are linearly connected in an ideal state, and the leaf spring, the movable blade and the fixed blade are laminated in an ideal state, the gap between the movable blade and the fixed blade can be reduced. However, in an actual shaver, this is very difficult to achieve. For example, if the connecting rod and the movable blade are not accurately connected in a straight line, or if the tip of the connecting rod vibrates in a direction perpendicular to the surface of the movable blade, a gap is formed between the movable blade and the fixed blade that reciprocate. As described above, a leaf spring is provided to reduce a gap between the movable blade and the fixed blade.
[0005]
Therefore, the gap between the movable blade and the fixed blade can be reduced by increasing the pressing force of the leaf spring. However, the frictional resistance between the movable blade, the fixed blade, and the leaf spring increases, and the movable blade cannot be reciprocated lightly and smoothly. This is because the frictional resistance of the movable blade against the fixed blade and the leaf spring increases in proportion to the pressing force of the leaf spring. If the pressing force of the leaf spring is weakened to lightly press the movable blade, a gap is easily formed between the movable blade and the fixed blade, resulting in poor sharpness. For this reason, the light sliding of the movable blade and the reduction of the gap between the movable blade and the fixed blade are mutually contradictory characteristics, and both cannot be satisfied.
[0006]
In particular, in order to drive a small motor with a thin battery, it is extremely important that the movable blade is lightly slid so that the electric shaver can be smoothly reciprocated.
[0007]
The present invention has been developed for the purpose of realizing this, and an important object of the present invention is to limit the gap between the movable blade and the fixed blade that reciprocate, to lighten the movable blade, An object of the present invention is to provide an electric razor that can smoothly reciprocate.
[0008]
[Means for Solving the Problems]
The electric razor of the present invention includes a fixed blade 14A provided at the tip of the elongated case 1 and a plate-shaped movable blade 14B laminated so as to be able to reciprocate slidably with respect to the fixed blade 14A. A leaf spring 17 for pressing the movable blade 14B so as to be elastically pressed by the fixed blade 14A, a connecting rod 13 for reciprocating the rear end of the movable blade 14B, and a driving mechanism for reciprocating the connecting rod 13. . The driving mechanism is configured to reciprocate the connecting rod 13, and the connecting rod 13 reciprocates the movable blade 14B.
[0009]
Further, the electric razor according to claim 1 of the present invention is provided with an elastic arm portion 14d protruding from the comb-shaped blade portion 14b of the movable blade 14B pressed by the leaf spring 17, and the connecting rod 13 is provided via the elastic arm portion 14d. Connected. The elastic arm portion 14d is provided so as to protrude rearward from the comb-shaped blade portion 14b, and connects a rear end of the elastic arm portion 14d to the connecting rod 13. The connecting rod 13 is connected to the comb-like blade 14b of the movable blade 14B via the elastic arm 14d. The elastic arm portion 14d absorbs a shift in the connection state between the connecting rod 13 and the movable blade 14B, and reciprocates the comb-shaped blade portion 14b of the movable blade 14B in close contact with the fixed blade 14A without any gap.
[0010]
The elastic arm portion 14d is provided such that a portion of the movable blade 14B protruding rearward from the comb-shaped blade portion 14b is made thinner or narrower, or a through hole 23 is provided so as to reduce the width.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following examples illustrate an electric shaver for embodying the technical idea of the present invention, and the present invention does not specify the electric shaver as follows.
[0012]
Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. Are added to the members indicated by "." However, the members described in the claims are not limited to the members of the embodiments.
[0013]
In the electric shaver shown in FIGS. 2 to 5, the entire shape of the case is an elongated cylindrical shape. The case 1 has a slightly thinner tip, and a comb blade 14 is attached to the tip. Further, as shown in an exploded perspective view of FIG. 6, the case 1 is provided at the rear end thereof with a battery chamber 3 for detachably storing a battery. A drive mechanism for reciprocating the comb blade 14 is incorporated adjacent to the battery chamber 3.
[0014]
The case 1 includes an inner case 1U, a blade base 1S on which a tip of the inner case 1U is closed, and a comb blade 14 is mounted, an intermediate lid 1C for closing a drive chamber 6 containing a drive mechanism, and an inner cover 1C. And an outer case 1T into which the case 1U is inserted. A cap 15 is detachably attached to a tip of the outer case 1T. The inner case 1U, the blade base 1S, and the intermediate lid 1C are made of plastic, and the outer case 1T and the cap 15 are thin metal cylinders, such as aluminum and stainless steel, whose bottoms are closed.
[0015]
As shown in the exploded perspective view of FIG. 7, the blade base 1S is provided with a comb blade 14 including a movable blade 14B and a fixed blade 14A. The movable blade 14B is mounted on the blade base 1S so as not to reciprocate, and the movable blade 14B is reciprocated with its rear end connected to the connecting rod 13. The blade base 1S in this figure has a leaf spring 17, a movable blade 14B, and a fixed blade 14A stacked and mounted.
[0016]
The leaf spring 17 is sandwiched between the blade base 1S and the movable blade 14B, and elastically presses the movable blade 14B against the fixed blade 14A. The leaf spring 17 shown in the figure is manufactured by cutting a thin metal spring plate with a mold and pressing. This leaf spring 17 is provided with elastic pressing pieces 17A that bend both sides upward to press both sides of the back surface of the movable blade 14B. In the figure, the upper elastic pressing piece 17A is provided at the center, and the lower elastic pressing piece 17A is provided at both ends in a U-shape. The U-shaped elastic pressing piece 17A presses the side edge of the movable blade 14B provided with the comb-shaped blade 14a at the tip thereof. The leaf spring 17 having this structure is fitted in a recess provided in the blade base 1S and is disposed at a fixed position.
[0017]
The movable blade 14B has a comb-shaped blade portion 14b provided with a comb-shaped blade 14a on a side edge, a rear-end connecting portion 14c connected to the connecting rod 13, and a movable blade 14B between the comb-shaped blade portion 14b and the connecting portion 14c. The elastic arm 14d is provided. The comb-shaped blade portion 14b is a portion that is elastically pressed by the fixed blade 14A via the leaf spring 17, and is slid in a state where this portion is in close contact with the fixed blade 14A to cut hair. Therefore, the comb-shaped blade portion 14b is provided with the comb-shaped blade 14a on the side edge, and cuts the hair between the comb-shaped blade 14a provided on the side edge of the fixed blade 14A.
[0018]
The elastic arm portion 14d is provided to protrude from the comb-shaped blade portion 14b to the rear end, and is more easily deformed than the comb-shaped blade portion 14b so as to be able to bend in a direction orthogonal to the surface of the plate-shaped movable blade 14B. . The movable blade 14B shown in FIG. 7 is provided with a rectangular through-hole 23 in the elastic arm portion 14d, and the through-hole 23 makes the width narrower than that of the comb-like blade portion 14b to facilitate deformation. However, as shown in FIG. 8, the width of the movable blade 14B can be reduced by providing a notch 25 on the side of the elastic arm portion 14d. Further, the movable blade may be configured such that the elastic arm portion is thinner than the comb-shaped blade portion so as to be an elastic arm portion that is easily deformed.
[0019]
The connecting portion 14c is provided at the rear end of the elastic arm portion 14d, and has a connecting hole 22 provided therein. The connecting portion 14c is provided with a connecting member 18 made of plastic, and the connecting protrusion 13A of the connecting rod 13 is inserted into a through hole of the connecting member 18 to connect the connecting rod 13 to the movable blade 14B. The connecting tool 18 has side walls integrally formed on both sides so as to be connected while sandwiching both sides of the connecting portion 14c, and a locking groove is provided inside the side wall. The connecting portion 14c is inserted into the locking groove, and the connecting member 18 is connected to the connecting portion 14c of the movable blade 14B.
[0020]
The fixed blade 14A has a comb-shaped blade 14a on a side edge. The tip of the fixed blade 14A is locked and fixed to a column 24 which is a hook provided on the blade base 1S. The fixed blade 14A has a connecting hole 22 at the rear end, and a support 24 is inserted through the connecting hole 22 to be fixed to the blade base 1S via the support 24. The support column 24 is formed in a hook shape with plastic so that the fixed blade 14A can be hooked and fixed.
[0021]
In the comb blade 14 shown in FIG. 7, the support post 24 is inserted into the through hole 23 of the movable blade 14B and the connecting hole 22 of the fixed blade 14A, and the movable blade 14B is mounted on the blade base 1S. The movable blade 14B has a slit shape extending in a reciprocating direction through the through hole 23 constituting the elastic arm portion 14d so that the movable blade 14B can reciprocate with the support column 24 inserted. The through-hole 23 provided in the elastic arm portion 14d of the movable blade 14B narrows the width of the elastic arm portion 14d to make it easy to bend, and is also used as a connection hole for fixing the movable blade 14B.
[0022]
As shown in FIG. 9, the blade base 1S is detachably attached to the inner case 1U. The blade base 1S is inserted and connected to the inner case 1U at the front end, and is fitted in a fixed position by inserting a stopper projection 19B protruding from the intermediate lid 1C into the stopper recess 20 at the rear end. When the blade base 1S is mounted on the tip of the inner case 1U, the connecting rod 13 is connected to the connecting portion 14c of the movable blade 14B. In order to connect the blade base 1S to the inner case 1U detachably, an elastic hook 19 having a stopper convex portion 19B is built in the distal end portion of the intermediate lid 1C as shown in FIG. The elastic hook 19 is made of plastic and integrally molded in an elliptical shape so that it can be elastically deformed. A detachable knob 19A is projected on the upper surface in FIG. 9, and a stopper convex portion 19B is provided which is projected rightward in the figure. I have. The stopper projection 19B projects from the tip of the intermediate lid 1C and is guided by the stopper recess 20 of the blade base 1S. When the blade base 1S of this structure is mounted at a fixed position of the inner case 1U in a state where the tip is inserted into and connected to the inner case 1U, the stopper projection 19B is inserted into the stopper recess 20 and mounted at the fixed position. . When removing the blade base 1S, the detachable knob 19A is moved toward the rear end, and the stopper protrusion 19B is drawn into the intermediate cover 1C. In this state, the stopper projection 19B is pulled out of the stopper recess 20, and the blade base 1S is detached from the inner case 1U.
[0023]
A part of the drive mechanism is built in the intermediate lid 1C so that the movable blade 14B is connected to the connecting rod 13 with the blade base 1S mounted on the inner case 1U. FIG. 10 shows an exploded perspective view of the intermediate lid 1C incorporating the driving mechanism. The intermediate lid 1C in this figure includes a gear that is rotated by meshing with a bevel gear of a motor 11, and an eccentric gear 12 that is rotated by the gear. A connecting rod 13 is connected to an eccentric cam of the eccentric gear 12. When the intermediate lid 1C is mounted on the inner case 1U, the gear is rotated by the motor 11 to reciprocate the connecting rod 13. The connecting rod 13 has a distal end connected to the movable blade 14 to reciprocate the movable blade 14B.
[0024]
The inner case 1U to which the intermediate lid 1C and the blade base 1S are attached has a substantially entire shape excluding a tip portion having an outer shape along the cylinder so that the inner case 1U can be inserted into the cylindrical outer case 1T without a gap. The inner case 1U inserts the entire battery chamber 3 and a part of the drive chamber 6 closed by the intermediate lid 1C into the outer case 1T, and closes the detachable opening 4 of the battery chamber 3. A part of the driving chamber 6 is double-closed by the intermediate lid 1C and the outer case 1T, but the detachable opening 4 of the battery chamber 3 is closed only by the outer case 1T.
[0025]
Since the battery chamber 3 of the inner case 1U is inserted into the outer case 1T to close the removable opening 4, the bottom surface has a double structure. Using this double structure, the extension lead plate 5 is fixed to the outside of the inner case 1U. The extension lead plate 5 is wired between the inner case 1U and the outer case 1T. As shown in FIG. 6, the extension lead plate 5 has a rear end bent upward, penetrates the inner case 1U from the outside to the inside, and makes contact with the rear end pole of the battery 2. The distal end of the extension lead plate 5 is cut in a U-shape, and penetrates the inner case 1U from the outside to the inside to project. The protrusion is used together with the contact of the slide switch 10 along the inner surface of the inner case 1U.
[0026]
A slide switch 10 connected between the battery 2 and the motor 11 to control the rotation of the motor 11 is connected to a switch knob 10B slidably mounted on the outside of the inner case 1U and connected to the switch knob 10B. And a switch plate 10C which reciprocates together and a slider 10A connected to the switch plate 10C. The switch knob 10B is connected to the switch plate 10C by passing a vertical rib through a slit of the inner case 1U. The switch plate 10C has a hook integrally formed at the tip so that it can reciprocate in a moderate state. The hook reciprocates over the protrusion integrally formed with the inner case 1U to perform a moderation. The slider 10A is connected to the switch plate 10C, reciprocates together with the switch plate, and has a bifurcated tip protruding downward. In the slider 10A, the protruding portion at the tip of each branch path comes into contact with both the extension lead plate 5 and the intermediate lead plate 9, and the slide switch 10 is turned on.
[0027]
The electrode plate 7 is mounted on the partition 8 of the inner case 1U. The electrode plate 7 connects the tip end of the battery 2 to the motor 11. In the electric shaver shown in the figure, the front end of the battery 2 is directly connected to the motor 11 by the electrode plate 7, and the rear end of the battery 2 is connected to the motor via the extension lead plate 5, the slide switch 10, and the intermediate lead plate 9. 11 is connected.
[0028]
In the drive chamber 6 of the inner case 1U, a motor 11 as a drive mechanism is mounted. In order to mount the motor 11 at a fixed position, a positioning rib 16 is integrally formed on the inner surface of the inner case 1U. In the motor 11, a bevel gear is fixed to a rotating shaft, and this bevel gear is connected to a gear built in the intermediate lid 1C.
[0029]
The outer case 1T is provided with a notch 21 for guiding the switch knob 10B at the opening. The inner case 1U guides the switch knob 10B to the bent portion 21 and is connected to a fixed position.
[0030]
【The invention's effect】
The electric razor according to the present invention has a feature that the gap between the reciprocating movable blade and the fixed blade can be minimized to improve sharpness, and the movable blade can be reciprocated lightly and smoothly. That is, the electric razor of the present invention is provided with an elastic arm protruding from the comb-shaped blade of the movable blade, connecting the movable blade to the connecting rod via this elastic arm, and further, the comb-shaped blade and the connecting portion This is because the elastic arm portion provided between them can be bent in a direction orthogonal to the surface of the plate-shaped movable blade. In a movable blade having an elastic arm portion that can be deformed in this direction, the elastic arm portion is deformed to absorb a displacement of the connected portion when the connecting rod is not accurately connected linearly. For this reason, it is possible to effectively prevent the comb-shaped blade portions of the movable blade and the fixed blade from separating due to a shift in the connection state or the like.
[0031]
As described above, the electric razor of the present invention deforms the elastic arm portion to reduce the gap between the movable blade and the fixed blade, so that it is not necessary to strongly press the movable blade against the fixed blade with a leaf spring. Can reciprocate lightly with little frictional resistance against the fixed blade. Therefore, the electric razor of the present invention has a feature that the movable blade and the fixed blade can slide in a state where the hair is cut well, and the movable blade is efficiently reciprocated to make a very sharp razor.
[Brief description of the drawings]
1 is an exploded perspective view of a conventional electric shaver; FIG. 2 is a front view of an electric shaver according to an embodiment of the present invention; FIG. 3 is a rear view of the electric shaver shown in FIG. 2; FIG. 4 is an electric shaver shown in FIG. FIG. 5 is a side view of the electric shaver shown in FIG. 2 with the outer case removed, FIG. 6 is an exploded perspective view of the electric shaver shown in FIG. 5, FIG. FIG. 8 is a plan view showing another example of a movable blade. FIG. 9 is a perspective view showing a state in which a tip cover is attached to the tip of an inner case. FIG. 10 is an intermediate cover incorporating a drive mechanism. Exploded perspective view [Description of reference numerals]
DESCRIPTION OF SYMBOLS 1 ... Case 1C ... Intermediate lid 1U ... Inner case 1T ... Outer case 1S ... Blade stand 2 ... Battery 3 ... Battery chamber 4 ... Removable opening 5 ... Extended lead plate 6 ... Drive room 7 ... Electrode plate 8 ... Partition wall 9 ... Intermediate lead Plate 10 Switch 10A Slider 10B Switch knob 10C Switch plate 11 Motor 12 Eccentric gear 13 Connecting rod 13A Connecting protrusion 14 Comb blade 14A Fixed blade 14B Movable blade 14a Comb blade 14b .. Comb-shaped blade 14c Connecting part 14d Elastic arm 15 Cap 16 Rib 17 Plate spring 17A Elastic pressing piece 18 Connecting tool 19 Elastic hook 19A Detachable knob 19B Stopper convex part 20 Stopper concave part 21 Notch 22 Connection hole 23 Through hole 24 Prop 25 Notch 26 Rod 27 E-ring

Claims (4)

A fixed blade (14A) provided at the tip of the elongated case (1), and a plate-shaped movable blade (14B) laminated so as to be able to reciprocate slidably with respect to the fixed blade (14A). A leaf spring (17) for pressing the movable blade (14B) elastically against the fixed blade (14A), and a connecting rod (13) for reciprocating the rear end of the movable blade (14B). A driving mechanism for reciprocating the connecting rod (13), wherein the driving mechanism reciprocates the connecting rod (13) and the connecting rod (13) reciprocates the movable blade (14B).
The movable blade (14B) is pressed by the leaf spring (17) and protrudes rearward from the comb-shaped blade portion (14b) provided with the comb-shaped blade (14a) on the side edge, and is moved. An electric shaver having an elastic arm portion (14d) that can bend in a direction perpendicular to the surface of (1), and a connecting rod (13) connected to the rear end of the elastic arm portion (14d). The electric shaver according to claim 1, wherein the movable blade (14B) is thinner at the rear than the comb-shaped blade (14b) to form an elastic arm (14d). The electric shaver according to claim 1, wherein the movable blade (14B) is narrower in width behind the comb-shaped blade portion (14b) to form an elastic arm portion (14d). The electric shaver according to claim 3, wherein the movable blade (14B) opens a through hole (23) behind the comb-shaped blade portion (14b) to reduce its width to form an elastic arm portion (14d).

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