JPH05146562A - Reciprocating electric razor - Google Patents

Abstract

PURPOSE:To provide a reciprocating electric razor free from the unnecessary motion of the outer cutter body and rotor of a shaving head, unless subjected to an external force, and free from the improper transmission of a drive force and the improper motion of the rotor due to the ingress of a foreign material. CONSTITUTION:A shaving head comprises an inner cutter body 30, a head frame 7 with a pair of end walls 12 on a skirt section 11 continuous to a body case, and a base section 18 built into the skirt section 11 for reciprocal motion. Furthermore, the shaving head comprises a driver 16 having an inner cutter body mounting axis 21 projected from the base section 18 and wound with a spring to support and press the inner cutter body to an outer cutter 34, and a rotating arm 27 pivotally fitted to the end walls 12 and connected to the driver 16. Also, there are provided a rotor 8 so supported as to be capable of free turn in the frame 7, an outer cutter holder 35 to retain the outer cutter 34, and an outer cutter case 36 to support the holder 35 with a freely deformable support arm 41. In this case, a freely detachable outer cutter body 10 is provided between the end walls 12 of the frame 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating electric shaver in which an outer cutter and an inner cutter which reciprocates in contact with an inner surface of the outer cutter can change its direction according to the skin surface.

[0002]

2. Description of the Related Art A reciprocating electric shaver in which an outer blade and an inner blade can change their directions according to the skin surface is known from Japanese Patent Laid-Open No. 227395/1987.
In this device, a pair of supporting portions are provided on an upper portion of a main body case having a built-in motor, and a shaving head, which is entirely exposed between the supporting portions, is rotatably supported via a pivot shaft. Therefore, by rotating the shaving head having the inner blade body built in about the pivot axis, the outer blade of the head can always contact the skin surface. A drive plate for driving the inner blade is slidably attached to the bottom member of the shaving head, and a groove is formed in the slide plate in a curved shape. A drive shaft protruding from the main body case is engaged with the groove between the support portions. The drive shaft is operated by the motor. Therefore, when the motor is operated, the inner blade body reciprocates in the width direction of the main body case while contacting the inner surface of the outer blade via the drive plate as the drive shaft and the groove are engaged, thereby shaving the beard. be able to.

[0003]

However, in the case of Japanese Patent Laid-Open No. 62-227395 in which the entire shaving head can freely rotate, even if no external force is applied to the shaving head, this head is liable to move due to its own weight. There is a problem of turning unnecessarily. Moreover, even when shaving a narrow portion, the shaving head easily rotates and moves, so that shaving of the portion is difficult. Then, in order to improve this point, it is necessary to previously provide a lock mechanism for arbitrarily stopping the rotation of the shaving head, but this causes a problem that the structure becomes complicated. further,
In the one disclosed in the above publication, since the entire shaving head is exposed and there is a gap exposed between the bottom surface portion and the main body case to the outside, foreign matter enters from this gap to transmit the driving force and There is a problem that the rotation of the shaving head is likely to be hindered.

An object of the present invention is to prevent unnecessary movement of the outer blade body and the rotating body of the shaving head unless an external force is applied, without requiring a locking mechanism in the shaving head, and to prevent foreign matter from entering. The object is to obtain a reciprocating electric shaver that is free from the problem of poor transmission of driving force due to invasion and malfunction of the rotating body.

[0005]

According to the present invention, a shaving head is provided in a main body case, and the head extends in the width direction of the main body case and has a circular arc-shaped cross section along the front-rear direction of the main body case. An outer blade having a plurality of blade portions, and an inner blade body that is in contact with the inner surface of each blade portion, and the inner blade body is moved to the width of the body case by a drive shaft that is driven by the power of a motor built in the body case. Applied to a reciprocating electric razor for shaving by reciprocating in the direction

In order to achieve the above object, the shaving head has a head frame in which a pair of end walls are provided in a skirt portion connected to the main body case, and a rotating body rotatably supported in the head frame. And an inner blade body supported by the rotating body, a spring for pressing the inner blade body against the inner surface of the outer blade, and an outer blade body detachably attached between both end walls of the head frame. The rotating body is built in the skirt portion and reciprocates in the width direction of the main body case by the drive shaft; and the rotating body projects from the base portion to support the inner blade body. A driving element having an inner blade mounting shaft around which the spring is wound; and a rotating arm having one end pivotally attached to an end wall of the head frame and the other end connected to the driving element. The outer blade body, An outer blade, an outer blade holder that holds the outer blade, and an outer blade case that accommodates and supports the outer blade holder via a supporting means, and the supporting means includes the outer blade holder and the outer blade case. Of the end plates facing each other, and an elastically deformable support arm provided on the other end and supporting the shaft.

[0007]

In the above structure, the support means provided between the outer blade case and the outer blade holder elastically supports the outer blade holder, so that the elastic force of the supporting arm and the inner blade of the outer blade holder. With a posture that balances the pressing force of the spring that presses the body,
Hold the outer blade holder stationary. When the outer blade is pushed from the outer surface, the outer blade holder floats with the elastic deformation of the supporting arm. At the same time, since the inner blade is pushed through the outer blade, the rotating body that supports the inner blade rotates about the pivot point of the rotating arm to displace the inner blade together with the outer blade. Further, since the base portion of the driver provided in the rotating body is reciprocated by the drive shaft driven by the power of the motor built into the main body case, the inner blade body supported by the inner blade body mounting shaft reciprocates accordingly. To be done. Therefore, shaving can be performed while preventing the blade portions of the outer blade from separating from the skin surface. The head frame of the shaving head is connected to the main body case, accommodates the rotating body therein, supports the outer cutter between both end walls, and has a driver of the rotating body at its skirt portion. Since the base is covered, the rotating body is not exposed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 2, reference numeral 1 is a main body case made of synthetic resin, in which a motor 2 is housed, and a storage battery (not shown) serving as a power source of the motor 2 is provided.
A printed wiring board (not shown) on which the charging circuit components for the storage battery are mounted and the like are housed.
Note that reference numeral 3 in FIG. 2 denotes a motor fixing plate integrally provided on the body case 1. Upward output shaft 2a of the motor 2
An eccentric cam 4 is fixed to the shaft 4, and the cam 4 has an upward eccentric shaft 5 at a position eccentric from the output shaft 2a. The eccentric shaft 5 is used as a drive shaft.

A shaving head 6 is provided on the upper portion of the main body case 1.
Is installed. This head 6 is shown in FIGS.
As shown in FIG. 3, the head frame 7, the rotating body 8, the spring 9, the outer blade body 10, and the inner blade body 30 are formed.

The head frame 7 is a synthetic resin molded product, and is formed by projecting upward end walls 12 at both longitudinal ends of a skirt portion 11 having an open lower surface. The head frame 7 is connected and fixed to the upper end of the main body case 1. It may be attached so that it can be removed if necessary without fixing. The upper wall of the skirt portion 11 is provided with a hole 13 located in the central portion thereof and having a size allowing the movement of an inner blade mounting shaft described later, and at the both end portions in the longitudinal direction of the through hole 14. Are provided respectively. The through hole 14 is formed of a long hole extending in the front-rear direction. In addition, pivot projections 15 are integrally provided on the inner surfaces of the distal end portions of the pair of end walls 12, respectively.

The rotating body 8 is composed of a driver 16 made of synthetic resin having elasticity and a rotating frame 17 made of synthetic resin. The driver element 16 includes a thick base portion 18 that is reciprocally moved in the width direction of the main body case 1, flexible deformable portions 19 provided at both ends in the longitudinal direction of the base portion 18, and tip ends of these deformable portions 19, respectively. It is formed of a thick connecting end portion 20 provided, an inner blade mounting shaft 21 protruding upward from the central portion of the base portion 18, and a driven portion 22. Driven part 22
Has an engaging groove 23 which is connected to the base portion 18 and which is an elongated hole extending in the front-rear direction. The eccentric shaft 5 is inserted into the groove 23.

Therefore, when the motor 2 is operated under the condition that the connecting end portion 20 is fixed so as not to move in the left-right direction in FIG. 2, the eccentric shaft (drive) which is eccentrically rotated via its output shaft 2a. Through the engagement between the shaft 5 and the engagement groove 23, the base portion 18 is linearly reciprocated in the left-right direction (the width direction of the main body case 1) while the flexible deformation portion 19 is flexibly deformed. ..

The connection of the driven part 23 to the base part 18 is
The projections 25 provided in the driven portion 23 are respectively passed through the small holes 24 provided in the base portion 18, and the projections 25 are respectively heat-crimped. The driven portion 23 is the base portion 18.
It may be molded integrally with. Moreover, the lower surface of the driven portion 23 is formed as a curved surface in the front-rear direction in order to reduce the gap between this and the upper surface of the eccentric cam 4.

The rotating frame 17 has a flat plate-shaped base portion 2.
6 are formed by bending upward turning arms 27 at both ends in the length direction. The base portion 26 overlaps between the connecting end portions 20 of the driver element 16, and both longitudinal end portions thereof are connected to the connecting protrusion portion 20 via thermal caulking protrusion portions 20 a protruding from the connecting protrusion portion 20. Therefore, the driver element 16 is integrally supported on the lower surface of the base portion 26. Further, a clearance hole 28 that allows the inner blade mounting shaft 21 to reciprocate is provided in the central portion of the base portion 26 in the longitudinal direction.

Both rotating arms 27 are tapered so that the width thereof in the front-rear direction becomes gradually narrower toward the upper end thereof. The rotating arms 27 pass through the through holes 14 of the skirt 11 separately, and the holes 29 provided at the tips thereof are fitted into the pivot projections 15, respectively. Therefore, the rotating body 8 is mounted in the head frame 7 so as to be rotatable in the front-rear direction about the pivot protrusion 15, and the driver 16 excluding the inner blade mounting shaft 21 thereof.
The respective parts and the base portion 26 of the rotating frame 17 are covered with the skirt portion 11.

An inner blade body 30 is supported on the upper end of the inner blade body mounting shaft 21 which is inserted through the escape holes 28 and the holes 13. As shown in FIGS. 4 and 5, the inner blade body 30 includes a pair of inner blades 31 and 32 and an inner blade base 3 that connects them.
3 and 3. Each of the inner blades 31 and 32 is formed by arranging a large number of inner blade plates on the inner blade base side by side at predetermined intervals along the width direction of the body case 1, and these inner blade bases are arranged by the inner blade base 33. They are connected together. Inner blade base 33
Has a cylindrical portion 33a on the lower surface of the central portion thereof.
Is fitted to the upper end of the inner blade mounting shaft 21.

The spring 9 is wound between the cylindrical portion 33a and the base portion 18. The spring 9 presses the inner blade body 30 against the blade portion of the outer blade body 10 by its spring force. The hole 13 is closed by a rubber packing or the like (not shown) provided by fitting the lower end portion to the hole edge and fitting the upper end portion to the cylindrical portion 33a.
It is designed so that it does not enter the main body case 1 through 3. Further, the motor 2, the rotating body 8, and the spring 9 are
It has an inner blade drive mechanism.

The outer blade body 10 covers the inner blade body 30 and the rotating arm 27 and is detachably mounted between the both end walls 12 of the head frame 7. As shown in FIGS. 1 and 3, the outer blade body 10 includes an outer blade 34 and an outer blade holder 35.
And an outer blade case 36 and a supporting means 37.

The outer blade 34 is formed by bending a thin metal plate, and has a pair of blade portions 38, 39 extending in the width direction of the main body case 1 on the upper portion thereof and parallel to each other. The cross-sections of the blade portions 38 and 39 arranged in parallel along the front-rear direction of the main body case 1 are arcuate shapes that are convex upward. Of course, each of the blade portions 38 and 39 is provided with innumerable small holes. The inner blade 31 is pressed against the inner surface of the blade portion 38, and the inner blade 32 is pressed against the inner surface of the blade portion 39.

The outer blade holder 35 is made of synthetic resin,
The outer blade 34 is held on the upper part thereof while maintaining the shape described above (see FIG. 3). The outer blade case 36 is also made of synthetic resin,
It has a substantially saddle shape as shown in FIG. This case 3
An outer blade holder 35 is housed between the left and right end plates 36a of the member 6 and is elastically supported by a supporting means 37. The outer blade case 36 is detachably attached between the end walls 12 of the head frame 7, and the holding means for the attached state is provided between the skirt portion 11 and the not shown.

As shown in FIG. 3, the support means 37 includes a plurality of shafts 40 integrally projecting outward from both end plates 35a of the outer blade holder 35 and the ends facing the end plates 35a. It is formed of a plurality of support arms 41 provided on the plate 36a. Each support arm 41 is elastically deformable and has a support hole 41a. These support holes 41a
The shafts 40 are inserted into the respective shafts, and thereby the outer blade holder 35 is elastically supported so as to be able to float in the vertical direction with the elastic deformation of the support arm 41. Further, the lower end of the end plate 35a of the outer blade holder 35 is in contact with the upper surface of the skirt portion 11, and an outer cover edge 42 is bent at the peripheral edge excluding this lower end. The cover edge 42 covers the rotating arm 27 by bringing its tip into proximity with or in contact with the inner surface of the end wall 12 of the head frame 7.

In the reciprocating electric shaver of the above construction, when the outer blade body 10 is not subjected to an external force such as when it is not used, the assembly of the rotating body 8, the spring 9 and the inner blade body 30 has its own weight. As shown in FIG. 4, the inner blade body mounting shaft 21 is arranged so that the axis thereof is vertical, and the state is such that the spring 9 presses the inner blade body 30 against the inner surface of the outer blade 34 and the supporting means 37. It is held by the elastic force of the support arm 41.

That is, the outer blade holder 35, which can float in the vertical direction, can be held stationary in a posture in which the pressing force of the spring 9 and the elastic force of the support arm 41 are balanced. The force that deforms the spring 9 and the support arm 41 by breaking the balance does not occur when the body case 1 is tilted. Therefore, unless an external force is applied, the rotating body 8
Also, it is possible to prevent the outer blade body 10 from moving unnecessarily. Moreover, in order to enable the outer blade holder 35 and the like to be held stationary when no external force is applied as described above,
No special locking mechanism is required. for that reason,
It has a simple structure, does not increase the labor of operation, and has a large function of suppressing the free movement of the outer blade holder 35 even when shaving in a narrow space, so that it is easy to use.

In use, since the inner blade 30 is reciprocated by the power of the motor 2, the blade portion 3 of the outer blade 34 is reciprocated.
The beard introduced through the 8,39 stoma can be shaved. In this shaving operation, the pair of blades 38, 3
Since the tops of 9 contact the skin surface to shave, the shave can be shaved in a short time. In addition, the beard waste is the outer blade holder 35 whose lower surface opening is closed by the skirt portion 11.
Is stored inside.

In this use, since the outer blade 34 receives a reaction force (external force) from the skin surface, when an outer force in the direction of arrow E in FIG. 4 acts on the inner blade 31 together with the blade portion 38 of the outer blade 34. The support arm 41 corresponding to the blade portion 38 is elastically deformed downward so that the blade portion 38 side of the outer blade holder 35 is displaced and the outer blade 34 is tilted. At the same time, since the inner blade 31 is also pushed in the direction of arrow E in FIG. 4 via the blade portion 38, the assembly is rotated by θ ° in the clockwise direction in FIG. Therefore, the inner blade 32 is lifted, the support arm 41 corresponding to the blade portion 39 is elastically deformed upward, and the blade portion 39 side of the outer blade holder 35 is pushed up. This state is shown in Figure 5.
It is shown in (A). Therefore, each blade portion 3 of the outer blade 34
Shaving can be performed while preventing the tops of 8, 39 from separating from the skin surface G, respectively.

On the contrary, when an external force in the direction of arrow F in FIG. 4 acts on the inner blade 32 together with the blade portion 39 of the outer blade 34,
The support arm 41 corresponding to the blade portion 39 is elastically deformed downward and is displaced so that the blade portion 39 side of the outer blade holder 35 is sunk, and the outer blade 34 is inclined in the opposite direction to the case of FIG. 5A. At the same time, the inner blade 32 is also pushed in the direction of the arrow F in FIG. 4 via the blade portion 39, so that the assembly is centered on the pivot projection 15 in FIG.
(B) It is rotated by θ ° in the counterclockwise direction. Therefore, the inner blade 32 is lifted in the opposite direction to the case of FIG. 5A, the support arm 41 corresponding to the blade portion 38 is elastically deformed upward, and the blade portion 38 side of the outer blade holder 35 is pushed up. This state is shown in FIG. Therefore, shaving can be performed while preventing the tops of the blades 38, 39 of the outer blade 34 from leaving the skin surface G, respectively.

As the rotating body 8 supporting the inner blade body 30 is rotated about the main spindle projection 15 as described above, the inner blade body 30 is made to follow the displacement of the outer blade 34, and the mutual positional relationship is maintained. Can be held constant, and shaving can be performed while preventing the blade portions 38, 39 of the outer blade 34 that are parallel to each other from leaving the skin surface G. Therefore, the pair of blades 3
It is possible to shave the beard in a short time by bringing the tops of 8, 39 into contact with the skin surface, respectively.

Further, in the reciprocating electric shaver having the above construction, the head frame 7 of the shaving head 6 is connected to the upper end of the main body case 1, and the rotating body 8 and the outer blade body 10 are respectively supported therein. There is. Moreover, the head frame 7 is provided with the skirt portion 11, which covers the base portion 18 of the driving element 16 of the rotating body 8. Therefore, foreign matter is prevented from entering between the eccentric shaft 5 and the rotating body 8 from the outside, and thus the driver element 16 due to the foreign matter entering.
There is no risk of poor transmission of the driving force to the rotating body 8 because foreign matter is prevented from entering between the body case 1 and the head frame 7 and the rotating body 8 from the outside. There is no fear of poor rotation.

The present invention is not limited to the above embodiment. For example, instead of omitting the rotary frame 17 of the rotary body 8, the rotary arm 27 of the frame 17 is replaced by the driver element 1.
The pivoting body 8 may be simplified in structure by being integrally formed with the connecting end portions 20 of 6 respectively. Further, the support means 37 may also have a configuration opposite to that of the above-described embodiment, that is, the shaft 40 may be provided on the end plate 36a of the outer blade case 36 and the support arm 41 may be provided on the end plate 35a of the outer blade holder 35. .. Further, although the head frame 7 is separate from the main body case 1 in the above-described embodiment, the head frame 7 may be integrally formed with the main body case 1 instead. Furthermore, in the present invention, the outer blade 3
The number of blades of 4 and the number of inner blades of the inner blade body 30 may be three or more, respectively.

[0031]

As described in detail above, according to the present invention, the outer cutter holder is kept stationary in a posture in which the elastic force of the support arm and the pressing force of the spring for pressing the inner cutter against the outer cutter are balanced. Since it can be held, it is possible to prevent the outer blade body and the rotating body of the shaving head from moving unnecessarily unless an external force is applied, and a special locking mechanism is not required to enable this. When shaving, the outer blade holder is floated along with the elastic deformation of the support arm, and at the same time, the rotating body supporting the inner blade body rotates and the inner blade body follows the displacement of the outer blade. Since it is possible to prevent the blade portions of the outer blades from separating from the skin surface while maintaining a constant mutual positional relationship, shaving can be performed in a short time. Further, the head frame of the shaving head is connected to the main body case, accommodates the rotating body therein, supports the outer blade body between both end walls, and has the base portion of the driver of the rotating body as the head frame. Since it is covered with the skirt portion, there is no possibility of poor transmission of driving force due to entry of foreign matter and poor rotation of the rotating body.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a shaving head according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the entire reciprocating electric shaver according to the same embodiment.

FIG. 3 is an exploded perspective view of an outer blade body according to the same embodiment.

FIG. 4 is a vertical sectional view showing an inner blade driving mechanism according to the same embodiment.

5A and 5B are vertical sectional views showing the operation of the inner blade driving mechanism according to the same embodiment.

[Explanation of symbols]

1 ... Main body case, 2 ... Motor, 5 ... Eccentric shaft (driving shaft),
6 ... Shaving head, 7 ... Head frame, 8 ... Rotating body, 9 ... Spring, 10 ... Outer blade body, 11 ... Skirt portion, 12
... end wall, 15 ... pivot protrusion, 16 ... driver, 18 ... base,
21 ... Inner blade mounting shaft, 27 ... Rotating arm, 30 ... Inner blade, 31, 32 ... Inner blade, 34 ... Outer blade, 35 ... Outer blade holder, 36 ... Outer blade case, 35a, 36a ... End plate , 37 ...
Support means, 38, 39 ... Blade portion, 40 ... Shaft, 41 ... Support arm.

Claims (1)

[Claims] 1. A shaving head is provided on a main body case, and the head has an outer blade extending in the width direction of the main body case and having a plurality of blade portions whose cross section along the front-back direction of the main body case is arcuate. , An inner blade member contacting the inner surface of each of the blade portions, and reciprocating the inner blade member in the width direction of the main body case by a drive shaft driven by the power of a motor built in the main body case, In a reciprocating electric razor for shaving, the shaving head includes a head frame in which a pair of end walls is provided in a skirt portion connected to the body case, and a rotating body rotatably supported in the head frame. An inner blade body supported by the rotating body, a spring for pressing the inner blade body against an inner surface of the outer blade, and an outer blade body detachably mounted between both end walls of the head frame. do it The rotating body is built in the skirt portion and reciprocates in the width direction of the main body case by the drive shaft, and the rotating body supports the inner blade body by protruding from the base portion and the spring is The outer cutter includes a driver having an inner blade body mounting shaft to be wound, and a rotating arm having one end pivotally attached to an end wall of the head frame and the other end connected to the driver. The body includes the outer blade, an outer blade holder that holds the outer blade, and an outer blade case that accommodates and supports the outer blade holder via a supporting unit, and the supporting unit is provided outside the outer blade holder. A reciprocating electric shaver, characterized in that the reciprocating electric shaver is formed by a shaft protruding from one of the end plates opposed to the blade case and an elastically deformable support arm provided on the other end and supporting the shaft.