JPH07250978A - Reciprocating electric razor - Google Patents

Abstract

PURPOSE:To provide the electric razor which can be made thin while keeping the large effective cutting area of a blade head for coarse shaving arranged between a pair of blade heads for finish shaving and while smoothly operating the blade head for coarse shaving. CONSTITUTION:This razor is provided with blade heads 1 for finish shaving comprising outer blades 10 composed of bent thin plates, where a lot of blade holes are formed, and inner blades 12 to be reciprocatively slid inside these outer blades and a blade head 2 for coarse shaving arranged between two blade heads, 1 and 1 for finish shaving arranged parallelly to a head frame 3. The blade head 2 for coarse shaving is composed of a fixed blade 20 for which a cross-section is inversely U-shaped and in which a slit provided on an upper wall is also opened in the side direction and both the end parts in the lengthwise direction are supported at the head frame, and a movable blade 22 to be reciprocatively slid on the inner face of the upper wall of the fixed blade while being arranged inside this fixed blade. Then, a linking and engaging part with a driving element for reciprocative drive at the movable blade is positioned lower than the lower end edges of both side walls of the fixed blade in the reciprocative moving area of the linking and engaging part.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a reciprocating electric shaver, and more particularly to a reciprocating electric shaver having a plurality of blade heads.

[0002]

2. Description of the Prior Art Various types of reciprocating electric razors having a plurality of blade heads have been conventionally provided, in which a finishing shaving blade head is provided on each side of a rough shaving blade head. Those disclosed are disclosed in JP-B-45-16992 and JP-A-49-8368. In those shown in these, the rough shaving blade head is arranged between a pair of finishing shaving blade heads arranged in parallel and in parallel,
Further, as a blade head for rough shaving, a type having a comb-teeth-shaped fixed blade and a movable blade is used, and as a blade head for finishing shaving, an outer blade having a large number of blade holes is slidably contacted with an inner surface of the outer blade. A net blade consisting of an inner blade is used. Further, when the blade head is used by moving it in a direction orthogonal to the blade reciprocating direction, the rough shaving blade head has a comb-teeth shape so that the blade head for shaving functions in any direction. A blade is used that protrudes toward the finishing shaving blade head side.

[0003]

The blade heads of different types thus arranged so that both types of blade heads can be shaved at the same time can reduce the amount of unshaved portion and can be quickly shaved. However, there is a problem in the case of achieving the required thinning in consideration of cutting whiskers in a region such as a submandibular region. That is, in the rough shaving blade head of the above-described embodiment, since the pair of comb-teeth-shaped fixed blade supporting members are present in the center in the width direction, the cutting effective area in the width direction (protruding length of the comb-teeth-shaped blade Is smaller than the entire width, and the effective cutting area also becomes smaller when the thickness is reduced. Although the effective cutting area can be increased by covering the finishing shaving blade with a large amount, the effective whisker cutting surface of the finishing shaving blade head becomes small at this time. Therefore, it is not possible to reliably cut long hair while reducing the width.

The present invention has been made in view of the above circumstances, and an object thereof is to maintain a large cutting effective area of a rough shaving blade head arranged between a pair of finishing shaving blade heads and to smoothly perform the cutting. (EN) Provided is a reciprocating electric razor which can be made thin while being operated.

[0005]

SUMMARY OF THE INVENTION The present invention, however, has a blade head for finishing shaving comprising an outer blade made of a curved thin plate having a large number of blade holes and an inner blade reciprocally sliding on the inner surface of the outer blade. And a rough shaving blade head disposed between two finishing shaving blade heads arranged in parallel and parallel to the head frame, wherein the rough shaving blade head has a top wall and both side walls. A fixed blade having an inverted U-shaped cross-section and having a slit provided on the upper surface wall at the side and both ends in the longitudinal direction supported by the head frame, and inside the fixed blade. It consists of a movable blade that is arranged and slides back and forth on the inner surface of the upper wall of the fixed blade,
The movable blade is provided with a connecting engagement portion with a reciprocating drive element at a lower portion in the center in the longitudinal direction, and the connecting engagement portion is lower than lower end edges of both side walls of the fixed blade in a reciprocating region thereof. It is characterized by being located in.

The rough shaving blade head herein is not limited to being supported by the head frame so as to be movable up and down and spring-biased upward, that is, it is floatable.

[0007]

According to the present invention, the rough shaving blade head has substantially the entire width of its upper surface as the effective cutting area. Therefore, even if the width of the rough shaving blade head is reduced in order to reduce the thickness, A large effective cutting area can be secured in the shaving blade head. Moreover, the coupling engagement portion with the reciprocating drive element provided in the lower part of the center of the movable blade in the longitudinal direction of the rough shaving blade head is lower than the lower end edges of both side walls of the fixed blade in the reciprocating region. Since the connecting engagement portion is not located in a narrow space between both side walls of the fixed blade having an inverted U-shaped cross section, the connecting engagement portion is not moved when the movable blade is reciprocated at high speed. The fixed blade does not collide with or come into contact with the inner surface of the side wall of the fixed blade, and the operation can be performed smoothly even if the width of the rough shaving blade head is small.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiments. As shown in FIGS. 2 and 3, this reciprocating electric shaver has a pair of blade heads 1, 1 at the upper end of a main body 5, A blade head 2 arranged between both blade heads 1 is arranged in parallel and in parallel, and these three blade heads 1, 1, 2 are simultaneously driven by a motor 4. In the figure, 6 is a trimmer block, and 7 is a switch unit.

Of the blade heads 1 and 2, the blade head 1,
As shown in FIG. 5, reference numeral 1 denotes an outer blade 10 formed of a thin metal plate and having a large number of blade holes, a mounting frame 11 holding the outer blade 10, and an inner surface of the outer blade slidable. The inner frame 12 shown in FIG. 4 is in contact with the mounting frame 11. The mounting frame 11 has a plurality of heat-sealing projections 13 for mounting the outer blades, connecting bosses 14, and engaging projections 15 on both outer surfaces thereof. E-shaped elastic arms 16 are integrally provided on both end surfaces, and engaging protrusions 17 are provided at the tip end portions of the central pieces of the elastic arms 16. Note that it is preferable to make a large cutout around the elastic arm 16 because cleaning of the attached beard scraps is facilitated.

As shown in FIGS. 8 and 9, the blade head 2 has a fixed blade 20 having an inverted U-shaped cross section composed of an upper wall and both side walls and having a large number of slits in the upper wall, and the fixed blade 2.
0, a pair of plates 21 and 21 fixed to both ends in the longitudinal direction by heat sealing, a movable blade 22 slidably contacting the inner surface of the upper wall of the fixed blade 20, and a joint 2 fixed to the movable blade 22.
The push-up springs 24, 24 are respectively arranged between the upper surface of the lower piece of the plate 21 and the lower surfaces of the spring receiving members 27, 27 at both ends of the movable blade 22. The plate 21 here is provided with engaging holes 25 and 26 arranged vertically on the outer end surface thereof. As shown in FIG. 9 (b), the heat-sealing portion is provided with a countersunk hole in the fixed blade 20 so that the heat-sealing portion does not protrude to the outer surface of the fixed blade 20. The fixed blade 20 and the movable blade 22 are contained within the maximum thickness of the plate 21 and the joint 23 except the upper portion of the fixed blade 20, so that the overall thickness is suppressed. Openings 20a, 20a are formed in portions of the side walls of the fixed blade 20 corresponding to the portions where the push-up springs 24 are arranged.
Is formed by increasing the outer diameter of the coil spring used as the push-up spring 24 and reducing the spring constant of the push-up spring 24 while avoiding the interference between the push-up spring 24 and other components. This is to reduce the variation of the spring pushing-up force due to the mounting accuracy, and to improve the whiskers dischargeability as described later. Furthermore, movable blade 2
The joint 23 arranged in the central part of 2 and the spring receiving members 27, 27 arranged at both ends are formed as separate bodies in order to improve the discharging performance of the beard scraps.

The blade heads 1, 1 and 2 are attached to the upper end of the main body 5 via the head frame 3 and the outer blade frame 56. As shown in FIG. 6, the head frame 3 is formed in a rectangular frame shape by molding a synthetic resin, and the engaging holes 3 are formed on both sides of both longitudinal end faces thereof.
1, 31, an E-shaped elastic arm 32 is provided at the center, and the tip of the elastic arm 32 is provided with a pair of upper and lower engaging projections 33, 34. Further, each of the above-mentioned engaging holes 31
On the inner surface side of the head frame 3, the upper end of the guide groove 35 whose lower end reaches the bottom surface of the head frame 3 is connected. Further, the head frame 3 is provided with hook portions 36, 36 provided with decorative buttons 39 on the outer surfaces of both ends thereof.
These hook portions 36, 36 are for detachably attaching the head frame 3 to the outer blade frame 56.

Further, a slide handle 50 is provided on the outer side of one side surface of the head frame 3, and a slide plate 51 is provided on the inner side thereof. The slide handle 50 and the slide plate 51 are slidably attached to the head frame 3 by engaging a hook 52 of the slide handle 50 with the slide plate 51 through an elongated hole 37 provided in the head frame 3. The slide plate 51 is provided with cam portions 53, 53 whose upper edges are inclined edges at both longitudinal ends thereof.

Head frame 3 formed as described above
On the other hand, the mounting frame 11 of the blade head 1 is housed in the head frame 3 from the lower opening of the head frame 3, and the engaging projections 17 have the engaging holes 31 of the head frame 3.
It is attached to the head frame 3 by engaging with.
At the time of this attachment, the guide groove 35 whose upper end reaches the engagement hole 31.
Guides the engagement protrusion 17 to the engagement hole 31. Blade head 2
Is attached to the head frame 3 by engaging the engaging protrusions 33 and 34 of the head frame 3 with the engaging holes 25 and 26 provided on both end surfaces thereof.

The engaging projection 33 and the engaging hole 25 are made smaller than the engaging projection 34 and the engaging hole 26 and have a shorter projecting length on the projection side. This is because it is possible to improve the assemblability by preventing the lower engagement protrusion 34 from engaging with the upper engagement hole 25 and preventing further movement when the two are assembled. Further, as shown in FIG. 7, shoulder portions 28 that come into contact with the head frame 3 are provided at the upper ends of both ends of the blade head 2 to regulate the upward movement of the blade head 2.
Before the blade head 2 is attached, the elastic arm 32, which is in a horizontal state as shown in FIG. 10, causes the engaging protrusions 33 and 34 of the elastic arm 32 to engage with the blade head 2 so that the blade head 2
When the is attached to the head frame 3, as shown in FIG. 11, the elastic arm 32 bends downward to generate a force for urging the blade head 2 upward. This is blade head 2
This is to prevent a large noise due to seesaw vibration during driving. As shown in FIG. 12, push-up springs 38, which are wire springs attached to both ends of the head frame 3, may push up both ends of the blade head 2 in the longitudinal direction.

On the other hand, an eccentric shaft and a pair of driver elements 41 and 42 for converting the rotation of the eccentric shaft into reciprocating motion are connected to the output shaft of the motor 4 arranged in the main body 5 side. As shown in FIG. 4, the inner blades 12 and 12 of the blade heads 1 and 1 are connected to the driver elements 41 and 42 whose upper portions project from the upper surface of the blade 5. At this time, the driver elements 41, 42 and the inner blades 12, 1
Push-up springs 19 and 19 for urging the inner blade 12 upward are disposed between the two. Further, the sub driver 44 is attached to the one driver 41. This sub-driver 44
Engage the joint 23 in the blade head 2.

At this time, the connecting engagement portion between the joint 23 and the auxiliary driving element 44 is reciprocated by the connecting engagement portions on both side walls of the fixed blade 20 of the blade head 2 for rough shaving as shown in FIG. It is located below the lower edge of the region. This requires that the connecting engagement portion has a certain thickness for power transmission, and therefore when the connecting engagement portion is positioned between both side walls of the fixed blade 20 having an inverted U-shaped cross section, each component It is avoided that the auxiliary drive element 44 comes into contact with both side walls of the fixed blade 20 due to the relationship between the precision and the assembly precision, resulting in a power loss when the movable blade 22 is driven at high speed, and a noise caused by a collision. This is because. In order to reduce the overall thickness, the shaving blade head 3 also has a small width so that the width of the space between the side walls of the fixed blade 22 is very narrow, and the shaving blade head has a float relationship to be described later. Although there is some play at the position in the width direction of 2 and the positional relationship between the fixed blade 20 and the sub-driving element 44 in the width direction is not precisely determined, the movable blade 22 can be smoothly driven. It is possible.

Therefore, two kinds of three blade heads 1, 1, 2
Are arranged in parallel and in parallel, and a pair of blade heads 1 suitable for finish shaving are provided on both sides of the blade head 2 suitable for rough shaving.
In this reciprocating electric razor in which 1 is arranged, when the motor 4 is driven, the rotation of the motor 4 causes the driving elements 41, 4 to rotate.
The reciprocating motion of the blade heads 1 and 1 causes the inner blades 12 and 12 of the blade heads 1 and 1 and the movable blade 22 of the blade head 2 to reciprocate. , 2, when the blade head 1 is attached to its mounting frame 1
The elastic arm 16 in 1 flexes and the blade head 2 floats by flexing the elastic arm 32 in the head frame 3.

Regarding the vertical movement of the blade head 1, in addition to the elastic force of the elastic arm 16, the driver element 41,
Although the force of the push-up spring 19 that presses the inner blade 12 against the inner surface of the outer blade 10 is interposed between the inner blade 42 and the inner blades 12 and 12, the vertical movement of the blade head 2 causes the movable blade 22 to move to the fixed blade. Since the push-up spring 24 that is pressed against 20 also moves up and down at the same time, only the elastic force of the elastic arm 32 acts, and the push-up spring 19 is normally set with a load of 200 to 300 gr in order to satisfy the sharpness. (The load on the elastic arms 16 and 32 is 10 to 2)
When the blade heads 1 and 2 are pressed against the skin, the blade head 2 is most likely to sink. For this reason, the blade head 2 for rough shaving and having a corner portion does not impair the feel on the skin.
Further, since the blade head 1 is for finishing shaving, it is possible to shave the beard out of the skin and shave shortly if a high contact pressure is generated between the blade head 1 and this. The above difference in elastic force between Nos. 1 and 2 is preferable.

Furthermore, it is desirable that the upper surfaces of these blade heads 1, 1 and 2 are substantially on the same line. This is because, if the blade head 2 is located higher than the blade head 1, the corners of the blade head 2 will hit the skin, which will give a large sense of foreign matter to the convex portions of the skin. Is lower than the blade head 1, it is difficult to introduce a long beard into the blade head 2 without hitting the skin with the blade head 2 in a recess such as a submandibular region where unshaving is likely to occur. .

Similarly, the upper surface width of the fixed blade 20 of the blade head 2 is preferably larger than the lower width thereof as shown in FIG. By doing so, it is possible to reduce the depression α between the upper part of the blade head 1 and the upper part of the blade head 2 and to reduce the amount of skin that gets in between.
It is possible to prevent the skin from colliding with the corners of the fixed blade 20 of the blade head 2, and the beveled portion of the fixed blade 20 having a large width is provided on the upper wall of the fixed blade 20 with a beard. At the same time, the introduction into the fixed blade 20 is promoted through the slit which also opens in the side wall.

A fixed blade 20 having an inverted U-shaped cross section, which is provided on such an upper wall and has a slit which is opened laterally, and a movable blade 22 which reciprocally slides on the inner surface of the upper wall of the fixed blade 20. In the rough shaving blade head 2 consisting of, there is no member in the width direction that does not participate in the cutting of the beard, such as the supporting member of the fixed blade 20, and the entire width is almost the effective cutting region. Therefore, although the width of the rough shaving blade head 2 is reduced in order to reduce the thickness, compared to the case of using the above-described type having a comb-tooth-shaped fixed blade and a movable blade. Thus, the effective cutting area can be increased, and long hair (beard) can be reliably cut. Further, whiskers cut at both ends of the fixed blade 20 are likely to be accumulated here because the plate 21 serving as the support surface of the push-up spring 24 is located below the whiskers, but on both side walls of the fixed blade 20. The opening 20 formed
Therefore, the beard scraps thus cut are not accumulated in the operation space of the push-up spring 24 and the operation of the push-up spring 24 is not hindered.

In FIG. 1, the gap γ between the blade head 2 and the other blade head 1 is larger than the gap β between the one blade head 1 and the other blade head 2. In view of the fact that the elastic arm 32 holding the blade head 2 extends from the other blade head 1 side and the bending of the elastic arm 32 occurs as the blade arm moves up and down, The collision between the head 2 and the blade head 1 is prevented.

When shaving a narrow beard such as under the nose, the slide handle 50 provided on the head frame 3 may be slid. Cam portions 53, 5 of the slide plate 51 that slides in conjunction with the slide handle 50
One of the blade heads 1 engaging the engaging projections 15, 15 with 3 moves downward as the slide plate 51 slides. At this time, the connecting boss 14 of the blade head 1 is The blade head 2 inserted in the connecting hole 29
Also moves downward, and as shown in FIG. 13, only the other blade head 1 projects. It should be noted that only one blade head 1 may be lowered.

[0024]

As described above, in the present invention, since the rough shaving blade head is arranged between the pair of finish shaving blade heads, the rough shaving and the subsequent finish shaving can be performed simultaneously. It is possible to perform quick shaving without leaving any shave, and moreover, as the above-mentioned rough shaving blade head, a fixed blade having an inverted U-shaped cross section and a slit provided on the upper surface wall which is also open to the side , A movable blade that is arranged inside the fixed blade and slides back and forth on the inner surface of the upper wall of the fixed blade is used, so that almost the entire width of the upper surface of the rough shaving blade head is the effective cutting area. Therefore, even if the width of the rough shaving blade head is reduced in order to reduce the thickness, the effective cutting area of the rough shaving blade head can be increased, and the rough shaving blade head can be used for finishing shaving. Small effective cutting surface of blade head No case that the results in, can be increased cutting efficiency of beard in each cutter head for this purpose.

Further, since the fixed blade of the rough shaving blade head is supported by supporting both ends in the longitudinal direction thereof with head frames, the rough shaving blade head and the finishing shaving blade head are brought close to each other. It can be arranged in a state, and can be easily thinned, and further, it is connected and engaged with a reciprocating drive element provided at a lower portion of the rough shaving blade head in the center in the longitudinal direction of the movable blade. Since the portion is located below the lower end edges of both side walls of the fixed blade in the reciprocating region, that is, the connecting engagement portion is provided in a narrow space between the both side walls of the fixed blade having an inverted U-shaped cross section. Since the movable blade is not positioned, the connecting engagement portion does not collide with or come into contact with the inner surface of the side wall of the fixed blade during the high speed reciprocating drive of the movable blade, and the width of the rough shaving blade head can be reduced. , Make its operation smooth It is possible.

In this respect, when the rough shaving blade head is supported so as to be movable up and down with respect to the head frame and is spring-biased upward so that it can be floated freely and the skin contact is good, This is particularly effective because the widthwise play that the fixed blade must have can be prevented from affecting the positional relationship between the fixed blade and the coupling engagement portion.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of an embodiment of the present invention.

FIG. 2 is a front view of the above.

FIG. 3 is a vertical sectional view of the above.

FIG. 4 is an exploded perspective view of the above.

FIG. 5 is an exploded perspective view of the above blade head.

FIG. 6 is a perspective view of the head frame and the outer blade frame of the above.

FIG. 7 is a cutaway front view showing a state in which a blade head is attached to the head frame of the above.

FIG. 8 is an exploded perspective view of the above rough shaving blade head.

9A and 9B show the above-described rough shaving blade head, in which FIG. 9A is a front view and FIG. 9B is an enlarged sectional view of a heat-sealing portion.

FIG. 10 is a side view showing a state during assembly.

FIG. 11 is a side view showing a state after assembly.

FIG. 12 is a partial cross-sectional view of another example.

FIG. 13 is a cross-sectional view showing a state in which one of the finishing shaving blade head and the rough shaving blade head is forcibly sunk.

[Explanation of symbols]

 1 Blade Head for Finishing Shaving 2 Blade Head for Rough Shaving 3 Head Frame 20 Fixed Blade 22 Movable Blade 23 Joint 44 Sub-driver

Claims (2)

[Claims] 1. A finishing shaving blade head comprising an outer blade made of a curved thin plate having a large number of blade holes and an inner blade reciprocally sliding on the inner surface of the outer blade, and arranged in parallel and parallel to a head frame. A reciprocating electric razor having a rough shaving blade head disposed between two finishing shaving blade heads, wherein the rough shaving blade head has an inverted U-shaped cross section including an upper wall and both side walls. A fixed blade having slits provided on the upper surface wall that are also opened laterally and both ends of the head frame in the longitudinal direction are supported; and an upper surface wall of the fixed blade that is disposed inside the fixed blade. Of the movable blade which slides back and forth on the inner surface of the movable blade, and the movable blade has a connecting engagement portion with a reciprocating drive element at the lower center of the longitudinal direction thereof, and the connecting engagement portion has a reciprocating region thereof. At the lower edge of both side walls of the fixed blade Reciprocating electric shaver, characterized in that located towards. 2. The reciprocating electric shaver according to claim 1, wherein the rough shaving blade head is supported so as to be vertically movable with respect to the head frame and is spring-biased upward. .