JPH07124345A - Electric razor - Google Patents

Abstract

PURPOSE:To keep a cutting quality of an electric razor high by methods that inner cutters are continuously pressed toward the top of an outer edge even when a cutter holder oscillates as well as vibrates and that the maximum touching pressure is always applied at the top of the outer edge. CONSTITUTION:An electric razor comprises an outer edge 1, forming many beard inducing holes, fixed in a cutter holder, the cutter holder fixed pivotably to a body case 75 and plural inner cutters 40, 40 put side by side to be pressed against the outer edge 1 so that the said inner cutters are moved rubbably with the outer edge 1 by a driving unit 55 reciprocatively driven by a motor 70. The inner cutters are pressed against the outer edge by springs 52, 52 which oscillate unitedly with the inner cutters, so that a pressing direction of the inner cutters is always pointed toward the top of the outer edge without being changed even when the outer edge holder oscillates as well as vibrates and a high touching pressure is always applied at the top of the outer edge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible for a plurality of inner blades to be reciprocatingly driven and slidably contact an outer blade, and for the inner blades and the outer blades to swing in a direction intersecting the reciprocating direction. Regarding electric shaving equipment.

[0002]

2. Description of the Related Art Generally, an electric shaving machine of an inner blade reciprocating type has an inner blade in which a large number of inner blades are arranged along the longitudinal direction and a large number of whiskers introducing holes to be slidably contacted with the inner blade. Have an outer blade and an outer blade holder that supports this outer blade,
This outer blade holder is attached to the body case. A motor is housed in the main body case, and the motor causes the inner blade to reciprocate in the longitudinal direction (left-right direction), whereby the blade of the inner blade is brought into sliding contact with the inner surface of the outer blade, and from the whisker introduction hole. The beard introduced is cut.

Recently, for example, Japanese Patent Application Laid-Open No. 5-1924
As described in No. 53, it has two or three inner blades, an outer blade holder is attached to the main body case so as to be swingable in a direction intersecting the longitudinal direction of the inner blades, and reciprocated by a motor. There is provided a so-called swinging head type electric shaver in which a plurality of inner blades are attached to a driven member so as to be swingable along the swing direction of the outer blade holder.

In this case, the outer blade is formed with a plurality of arcuate ridges, and when the outer blade holder oscillates, the inner blade also oscillates. Since the tops of the shavings come into contact with the skin at the same time, when the shaving device is moved in one direction along the skin, multiple shavings touch the same skin surface, that is, multiple shavings are made, which improves cutting efficiency. Are better.

Further, the swing type electric shaving apparatus described in the above publication is a block type swing type in which the inner blade and the outer blade are made into a block and the cutter block is swingably supported with respect to the main body case. However, there is an advantage that the bottom plate and the like required for the cutter block type are not necessary.

[0006]

By the way, in this type of razor, the inner blade is pressed against the outer blade by the coil spring, whereby the inner blade applies a predetermined contact pressure to the outer blade. I am supposed to keep it.

However, in the conventional case, as disclosed in the above publication, a plurality of inner blades are pressed against the outer blade by a single coil spring, and the inner blade and the outer blade swing. However, the coil spring does not swing. In such a structure, the inner blade is always pushed in the axial direction of the body case by the coil spring, and when the outer blade and the inner blade swing and swing, the inner blade is pushed in the axial direction of the body case. . Therefore, the inner blade is not pushed toward the top of the outer blade, and the contact pressure at the top is reduced. In other words, when the outer blade holder swings, the direction in which the inner blade presses the outer blade deviates from the top direction of the outer blade, and therefore the contact pressure of the outer blade top that constantly touches the skin decreases, Is easily separated from the outer blade, so-called escape of the inner blade occurs, and there is a problem that sharpness is reduced.

Therefore, it is an object of the present invention to allow the inner cutter to always press the inner cutter toward the top of the outer cutter even when the outer cutter holder swings and swings, so that the top of the outer cutter is always in contact with the skin. The present invention aims to provide an electric shaving device capable of generating maximum contact pressure at a high level and maintaining high sharpness.

[0009]

In order to achieve the above object, the present invention attaches an outer cutter having a large number of whisker introducing holes to an outer cutter holder, and the outer cutter holder is mounted in a longitudinal direction with respect to a main body case. It is swingably supported in a direction intersecting with, and a plurality of inner blades are arranged and pressed against this outer blade, and these inner blades are reciprocally driven by a motor housed in the main body case, and in the same direction as the outer blade swinging direction. In an electric shaving device that is reciprocally driven by a swingable drive member, the inner blade is pressed against the outer blade by a spring member that swings integrally with the inner blade.

[0010]

According to the present invention, since the inner blade is pressed against the outer blade by the spring member that swings integrally with the inner blade, the pressing direction of the inner blade is always kept even if the outer blade holder swings. The pressing direction does not change toward the top of the outer cutter. Therefore, a high contact pressure always acts on the top of the outer blade, and problems such as the inner blade moving away from the outer blade due to swinging are prevented,
It is possible to prevent deterioration of sharpness.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. In the figure, reference numerals 1 and 1 denote a pair of outer blades, and these outer blades 1 and 1 are each formed of a flexible thin plate having a mesh-shaped whisker introduction hole 2. Each of the outer blades 1 and 1 is curved in an arcuate cross section, and has mounting holes 3 ... One ends of the outer blades 1 and 1 are fixed to the pair of outer blade mounting plates 4 and 4, and the other ends are fixed to the middle frame 5. Locking bosses 6 are formed on the outer blade mounting plates 4 and 4 and the inner frame 5, and the outer blade mounting holes 3 of the outer blades 1 and 1 are formed on the outer blade mounting plates 4 and 4.
And the locking bosses 6 of the inner frame 5 are engaged with each other, whereby the pair of outer blades 1, 1 are integrally connected to the outer blade mounting plates 4, 4 and the inner frame 5, and these are joined to the outer blade body 7. Are configured.

The outer blade body 7 is attached to an outer blade holder 8. The outer cutter holder 8 has a frame shape, and as shown in FIG. 1, holding grooves 9, 9 into which the outer cutter mounting plates 4, 4 of the outer cutter body 7 are fitted are formed on the inner surface of the outer cutter holder 8. . When the outer blade mounting plates 4 and 4 of the outer blade body 7 are fitted into the holding grooves 9 and 9, the outer blade mounting plates 4 and 4 can slide up and down in the holding grooves 9 and 9. The inner frame 5 has engaging holes 10 formed at both ends fitted into a fitting boss 11 formed on the lower surface of the end of the outer blade holder 8, and the outer boss holder is caulked to squeeze the fitting boss 11. It is fixed at 8.

On the outer surface of the end portion of the outer blade holder 8, as shown in FIGS.
2 is formed. These shaft holes 12 and 12 are rotatably attached to the rotation support bases 13 and 13, respectively.
Supporting shafts 14 and 14 that fit into the shaft holes 12 and 12 are provided in a projecting manner on the surfaces of the rotating support bases 13 and 13 that face each other, and the outer blade holder 8 is mounted by these supporting shafts 14 and 14.
Is rotatably supported. Therefore, the outer blade holder 8 and the outer blade body 7 attached to the outer blade holder 8 are
It is rotatable about 14 as a center O. That is, this rotation is to rotate in a direction intersecting the longitudinal direction of the inner blade, which will be described later, and is so-called swinging.

In this case, at least one rotation support base 1
A neutral biasing spring 15 is attached to 3. The neutral biasing spring 15 is formed by bending a wire into an arc shape and bending and extending both ends thereof so as to be substantially parallel to each other.
Both ends thereof are attached so as to penetrate through an arc hole 16 formed in the rotation support base 13. Both ends of the neutral urging spring 15 are in contact with the lower end surface of the outer blade holder 8. When the outer blade holder 8 swings and swings, one lower end of the outer blade holder 8 pushes one end of the neutral biasing spring 15, which elastically deforms and releases the outer swinging force of the outer blade holder 8. In addition, the elastic return force of the neutral biasing spring 15 acts on the outer blade holder 8 to automatically return the outer blade holder 8 to the neutral position, so that the outer blade body 7 is always held at the neutral position. There is.

A plurality of fixed bosses 18 are formed on the rotary supports 13 and 13, respectively. The rotary support bases 13 and 13 are fixed to the outer blade case 20 by using the fixed bosses 18 ... The outer blade case 20 has a frame shape made of die-cast or plated on the surface, and fixing holes 21 ... Are formed in the end wall in the longitudinal direction. These fixing holes 21 ...
The fixing holes bosses 18 of the rotation supporting bases 13 and 13 are fitted into the fixing holes bosses 18 and the fixing holes 21. 13 is fixed to the outer blade case 20.

Elastic tongues 22 and 22 are formed on the rotation support bases 13 and 13, respectively.
Locking claws 23, 23 are formed at the tip of 2. These locking claws 23, 23 are locked to the lower end of the end wall of the outer blade case 20.

The outer blade case 16 includes a support frame 30.
It is detachably attached to. The support frame 30 is fixed to the case cover 32 via fixing screws 31 ..., The case cover 32 is fixed to the main body case 75 via other fixing screws 33. Support frame 30
Standing walls 34, 34 are formed on both ends of the outer cutter case 20, and the outer blade case 20 is detachably fitted between the standing walls 34, 34. Further, mounting holes 35, 35 that open to the left and right are formed in these rising walls 34, 34, and the outer blade case 20 is fixed to the rising walls 3 and 34.
4 and 34, the locking claws 23 of the rotation support bases 13 and 13 fixed to the outer blade case 20, respectively.
23 is adapted to be hooked on the upper side of the mounting holes 35, 35. As a result, the outer blade case 20 is attached to the support frame 30.

Pressers 36, 36 are attached to the attachment holes 35, 35 of the support frame 30.
These pressers 36, 36 close the outer openings of the mounting holes 35, 35, and oppose the locking claws 23, 23 hooked on the upper sides of the mounting holes 35, 35 with pressing projections 37, 37. Have These pushers 36, 36
When pushing in, the pressing protrusions 37, 37
The elastic tongues 22 and 22 are elastically deformed by pushing, whereby the locking claws 23 and 23 are disengaged from the upper sides of the mounting holes 35 and 35, and the engagement is released. Therefore, the outer blade case 20 can be removed from the support frame 30.

The pushers 36, 36 are coil springs 3.
It is pushed outward by 8, 38 and the hook 3
The attachment holes 35 and 35 are kept closed by the hooking of the support frame 30 by the support holes 9 and 39.

Reference numerals 40 and 40 denote a pair of inner blades. As shown in FIG. 9, the inner blades 40 and 40 are constructed by providing a large number of inner blade blades 42 along the longitudinal direction of the blade base 41. . These inner blades 40, 40 slidably contact the inner surfaces of the outer blades 1, 1, and the inner blades 42 ...
The whiskers introduced from the whiskers introducing holes 2 of the outer blades 1, 1 are cut by sliding on the inner surface of the whiskers 1.

A plurality of round bosses 4 are provided on the lower surface of the blade base 41.
3 are formed, and these round bosses 43 ...
Are fitted in the fitting holes 46 formed in the upper surfaces of the inner blade mounting bases 45, 45 shown in FIG. And these round bosses 43
The inner blades 40, 40 are fixed to the inner blade mounting bases 45, 45 by caulking.

Pivotal support holes 47 are formed on the respective side surfaces of the inner blade mounts 45, 45, and these pivot support holes 4 are formed.
7 are fitted with pivot shafts 49 ... Formed on the mounting base supports 48, 48 shown in FIG. Therefore, the inner blades 40, 40 are movably supported by the mount supports 48, 48 in a seesaw motion.

The mounting bases 48, 48 are shown in FIG.
It is attached to the inner blade stand 50 shown in FIG. A pair of guide pins 51, 51 are erected on the inner blade base 50. The guide bases 51, 51 are mounted on the mounting base supports 48, 4 respectively.
8 is slidably fitted vertically. Coil springs 52, 52 corresponding to the spring members of the present invention are mounted on these guide pins 51, 51.
Reference numerals 2, 52 press the mounting base supports 48, 48 upward. Therefore, the inner blades 40, 40 are pressed against the outer blades 1, 1 by receiving the biasing force of these coil springs 52, 52. In this case, the inner blades 40, 40 are pushed toward the top of the outer blades 1, 1 by the independent coil springs 52, 52.

The inner cutter base 50 is provided with fulcrum shafts 53, 53 at end portions along the longitudinal direction of the inner cutters 40, 40, and arc-shaped slide surfaces 54, 54. The arcuate slide surfaces 54, 54 are provided on the inner blade base 5.
When the outer blade holder 8 is installed at a predetermined assembly position, the outer blade holder 8 is formed on the circumference of a predetermined radius circle centered on the swing center O when the outer blade holder 8 swings and swings.

The inner blade base 50 is swingably attached to an inner blade base receiver 55 shown in FIG. Inner blade holder 5
Reference numeral 5 corresponds to the driving member of the present invention, in which concave grooves 56, 56 for receiving the fulcrum shafts 53, 53 are formed at both ends, and from the circular arc surface with which the slide surfaces 54, 54 are in sliding contact. Guide surfaces 57, 57 are formed.

A holding boss 58 is formed on the lower surface of the inner blade base 50. A shaft portion 61 formed on the reciprocating driving body 60 is fitted into the holding boss 58.

The reciprocating driving body 60 corresponds to the support frame 30.
It is sandwiched between the case cover 32 and the case cover 32, and integrally has the shaft portion 61 in the center portion, and has fixed flange portions 63, at both ends in the longitudinal direction through flexible thin portions 62, 62.
63 is formed. These fixed flange parts 63, 6
3 is sandwiched between a support frame 30 and a case cover 32, and fastened together with the fixing screw 31.

The shaft portion 61 formed in the central portion loosely penetrates a large opening through hole 64 formed in the support frame 30 and engages with a holding boss 58 formed on the lower surface of the inner blade base 50. . A packing 65 made of rubber or the like is fitted into the through hole 64 to prevent whiskers from entering the case body.

A sliding groove 66 is formed on the lower surface of the reciprocating driving body 60. The sliding groove 66 extends orthogonally to the longitudinal direction of the reciprocating driving body 60. An eccentric shaft 67 is engaged with the sliding groove 66. The eccentric shaft 67 is eccentrically formed on an eccentric top 68, and the eccentric top 68 is attached to a motor shaft 71 of a drive motor 70. Drive motor 7
0 is contained in the main body case 75, and the main body case 75
By operating the switch 76 provided in, a battery (not shown) is used as a power source.

The eccentric top 68 penetrates an insertion hole 69 formed in the case cover 32 and engages with the sliding groove 66.

Therefore, when the motor 70 is rotated by operating the switch 76, the rotation of the motor shaft 71 causes the eccentric shaft 67 of the eccentric top 68 to eccentrically rotate (turn). The rotation of the eccentric shaft 67 is transmitted to the reciprocating driving body 60, but since the eccentric shaft 67 is engaged with the sliding groove 66, the eccentric rotation motion of the eccentric shaft 67 is the forward and backward movement by the sliding groove 66. By absorbing the components, the reciprocating driving body 60 is caused to reciprocate in the longitudinal direction (left-right direction = blade width direction). Since the reciprocating driving body 60 has flexible thin-walled portions 62, 62 at both ends in the longitudinal direction, when the reciprocating driving force is applied, the flexible thin-walled portions 62, 62 are flexibly deformed, and only the central portion is long. Reciprocates in the direction (left and right). Therefore, the shaft portion 61 formed in the central portion reciprocates in the longitudinal direction. This reciprocating motion is
The inner blade holder 55 is reciprocally driven, so that the inner blades 40, 40 are reciprocally driven in the longitudinal direction via the inner blade holder 50 and the mounting base supports 48, 48.

Therefore, the whiskers introduced from the whisker introducing holes 2 of the outer blades 1, 1 are cut by the shearing action of the blades 42 of the inner blades 40, 40 and the whisker introducing holes 2.

The operation of the reciprocating electric shaving apparatus having such a structure will be described. In such a reciprocating drive type electric shaver, since the outer blades 1, 1 and the outer blade holder 8 are swingable with respect to the outer blade case 20, the tops of the pair of outer blades 1, 1 simultaneously touch the skin. Will be hit. That is, since the outer blade holder 8 is rotatably supported by the outer blade case 20 about the support shafts 14 and 14 as the center O, if one of the pair of outer blades 1 and 1 tries to hit the skin, an unbalanced load is applied. Acts, the outer blade holder 8 automatically tilts back and forth, and the pair of outer blades 1, 1 simultaneously contact the skin.
Therefore, the pair of front and rear outer blades 1, 1 can shave the beard with the pair of front and rear blades because the tops of the respective mountains contact the skin, and the shaving is performed twice, resulting in high shaving efficiency.

In this case, the inner blades 40, 40 slidably contacting the outer blades 1, 1 have inner blades 50 and mounting base supports 48, 4 respectively.
8 are pressed against the outer blades 1, 1 by the coil springs 52, 52 provided between the inner blade base 50, the coil springs 52, 52 and the mounting base supports 48, 48, respectively. Since the inner blades 40, 40 swing and swing together with the inner blades 40, 40, the inner blades 40, 40 are always pushed toward the top of the outer blades 1, 1.

That is, the above-mentioned JP-A-5-1924.
In the shaving device described in No. 53, the two inner blades are commonly pressed by a single coil spring, and the coil springs do not swing and swing.
5 is pressed in the axial direction, that is, in the directions of arrows B and B in FIG. However, in the case of a swinging type shaving device, the outer blades 1 and 1 come into contact with the skin S to be shaved at the surface connecting the ridge lines and hit the skin S at a right angle. Therefore, in the conventional case, the pressing directions C and C of the coil spring are different from the direction in which the coil spring is pressed against the skin.

On the other hand, in the case of the present invention, the coil spring 5
Since the inner blades 40 and 40 swing together with the inner blades 40 and 40, the inner blades 40 and 40 always move toward the top of the outer blades 1 and 1, that is, to the skin, as indicated by arrows D and D in FIG. It will be able to be pressed in a direction perpendicular to it. For this reason, the maximum contact pressure acts on the tops of the outer blades 1 and 1, and even if the reaction force from the skin is received, the inner blade 4
0 and 40 do not separate (escape) from the outer blades 1 and 1, and no gap is created between the blades 42 of the inner blades 40 and 40 and the inner surface of the outer blades 1 and 1. Therefore, good sharpness can be maintained and the cutting performance is improved.

In the case of the above embodiment, the outer blade holder 8
When the head swings and swings, the outer blade holder 8 is returned to the neutral position by the neutral biasing spring 15 attached to the rotation support base 13, so that the outer blades 1, 1 always move in the axial direction of the main body case 75. As a result, the operability of the shaver is improved.

The inner blades 40, 40 are also swung in accordance with the swing of the outer blade holder 8. The inner blades 50, 40 swing relative to the inner blade rest 55 with respect to the swinging of the inner blades 40, 40. Allowed by being slide-guided. That is, the fulcrum shafts 53, 53 are provided at the ends of the inner blade base 50, and the sliding surfaces 54, 54 having an arc shape are formed. On the other hand, the inner blade base receiver 55 has both end portions. To the fulcrum shafts 53, 53
Is formed with concave grooves 56, 56 for receiving
After forming the guide surfaces 57, 57 formed of circular arc surfaces with which the slide surfaces 54, 54 are in sliding contact, as shown in FIG. 14, the fulcrum shafts 53, 53 are guided by the concave grooves 56, 56 and the slide surfaces The inner blade base 50 can be swung by the sliding contact of the guides 54, 54 with the guide surfaces 57, 57. In this case, since the slide surfaces 54, 54 and the guide surfaces 57, 57 are in sliding contact with each other, the reaction force from the skin applied from the outer blades 1, 1 toward the inner blades 40, 40 is applied to the coil springs 52, 52.
It can be received via a wide sliding surface of this. In this case, since the fulcrum shafts 53, 53 are fitted in the recessed grooves 56, 56 with play, the reaction force is prevented from being concentrated on the fulcrum shafts 53, 53, and the fulcrum shafts 53, 53 are prevented from acting. Wear and breakage are prevented.

The fulcrum shafts 53, 53 have the concave grooves 56, 5
6 is inserted with play, the vibration generated on the motor side can be absorbed by this play.

The present invention is not limited to the above-mentioned embodiment. For example, although the inner blades 40, 40 are pressed by the respective coil springs 52, 52, a plurality of inner blades may be used. You may make it press with one coil spring. However, also in this case, the coil spring needs to swing integrally with the inner blade.

The present invention can be variously modified or applied within the scope of the gist of the present invention.

[0042]

As described above, according to the present invention, since the inner blade is pressed against the outer blade by the spring member which is integrally rocked with the inner blade, even if the outer blade holder swings. The pressing direction of the inner blade is always toward the top of the outer blade, and this pressing direction does not change. Therefore, when a high contact pressure is constantly applied to the top of the outer blade and the head swings and swings, it is possible to prevent problems such as the inner blade separating from the outer blade even if a reaction force is received from the skin, and it is always good. The sharpness can be maintained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a head portion of an electric shaver according to an embodiment of the present invention, taken along line I-I of FIG.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1 in the embodiment.

FIG. 3 is an exploded perspective view of an outer blade and an inner blade in the embodiment.

FIG. 4 is a front view of the electric shaver according to the embodiment.

FIG. 5 is a sectional view showing an outer blade assembling structure of the embodiment.

FIG. 6 is an exploded perspective view showing the outer blade assembling structure of the embodiment.

FIG. 7 is a view of the same embodiment taken along line VII-VII in FIG.

8 is a view of the same embodiment taken along line VIII-VIII in FIG.

FIG. 9 shows a structure of an inner blade, (A) is a front view and (B) is a front view.
The figure is a cross-sectional view taken along the line BB of FIG.

FIG. 10 is a perspective view of an inner blade mounting base.

FIG. 11 is a perspective view showing a mount support, and FIGS. 11A and 11B are perspective views seen from different directions.

FIG. 12 is a perspective view showing an inner cutter base, and FIGS. 12A and 12B are perspective views seen from different directions.

FIG. 13 is a perspective view showing the inner blade holder, and FIGS. 13A and 13B are perspective views seen from different directions.

FIG. 14 is a cross-sectional view showing an assembled state of the inner blade rest and the inner blade rest.

[Explanation of symbols]

1 ... Outer blade 2 ... Whisker introduction hole
7 ... Outer blade body 8 ... Outer blade holder 12 ... Shaft hole
13 ... Rotating support base 14 ... Support shaft 15 ... Neutral bias spring
20 ... Outer blade case 30 ... Support frame 36 ... Pusher 40 ... Inner blade 42 ... Blade 45 ... Inner blade mounting base 48 ... Mounting base support
50 ... Inner blade 52 ... Coil spring 53 ... Support shaft
54 ... Sliding surface 55 ... Inner blade receiving member (driving member) 56 ... Recessed groove 57 ... Guide surface 60 ... Reciprocating driving body 61 ... Shaft part 67 ... Eccentric shaft 68 ... Eccentric top 70 ... Driving motor 71 ... Motor shaft 75 ... Main body Case 76 ... Switch

Claims (1)

[Claims] 1. A plurality of inner blades are provided along the longitudinal direction, a plurality of inner blades arranged side by side that are reciprocally driven along the longitudinal direction, and a plurality of whisker introducing holes are formed therein. An outer blade with which the blade is in sliding contact, an outer blade holder that supports the outer blade, a body case that swingably supports the outer blade holder in a direction intersecting the longitudinal direction of the inner blade, and the body case And a drive member that is reciprocally driven by a motor housed in the inner cutter and that swingably supports the inner blade in a direction intersecting the longitudinal direction, and swings integrally with the inner blade to press the inner blade against the outer blade. An electric shaver, comprising: a spring member.