MXPA98004823A - Electric shave machine - Google Patents

Abstract

The present invention relates to an electric shaving machine comprising an outer blade unit provided with a plurality of grooves forming slit-shaped blades in a plurality of separate annular sheet forming regions and an inner blades unit provided with a plurality of inner leaf elements disposed in an annular configuration with pointed ends in contact with inner surfaces of the slit-shaped blades in the plurality of separate sheet forming regions and rotated in relation to the outer blades unit , wherein the plurality of separate sheet forming regions is configured in the form of at least two separate concentric circles in the outer blade unit, the at least two separate concentric circles comprise an outermost sheet forming region, at least one interior sheet forming region coaxial with the re For more exterior leaf formation, a thickness of the slit-shaped leaves in the inner sheet forming region is formed less than a thickness of the sheet-like sheets in the outermost sheet-forming region and each of the plurality of inner leaf elements is bifurcated and disposed in at least two separate concentric annular configurations corresponding to the at least two concentric separate circles of the outer knife unit.

Description

- i - ELECTRICAL SHAVING MACHINE BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric shaver of the rotating type. 2. Previous technique A conventional rotary type electric razor will be described first. As shown in Figures 10 and 11, an electric razor is equipped with at least one shaving unit 54 consisting of a circular outer cutting unit 50 and a circular inner cutting unit 52 which is rotated in relation to the unit 50 outside cutter. The outer cutting unit 50 is provided with two annular blade forming regions 56a and 56b, and a plurality of hair entry slots 62a and 62b of the same width that are formed so that they are side by side in the circumferential direction and they extend substantially in radial configuration, whereby they form slotted blades 58a and 58b in the annular blade forming regions 56a and 56b. For the slot-like outer blades 58a, the side walls of the edge 64a which is formed by two adjacent slots 62a of the outer blade forming region 56a act as blade surfaces to cut the hairs from the beard; and likewise, for the inner slotted blades 58b, the side walls of the shoulders 64b which are formed by two adjacent slots 62b of the inner blade forming region 56b, which act as cutting surfaces for cutting the hair of the beard. Here, the term "substantially radial configuration" described above refers to the fact that the respective grooves 62a and 62b are formed in a straight line so that the grooves extend from the inner circumferences of the respective regions of formation 56a and 56b. blade towards the outer circumferences of the blade forming regions with the slots inclined at a prescribed angle with respect to the radial direction extending from the center of each of the outer cutting units 50. In addition, the "prescribed angle" refers to an angle in the range from 0 degrees to 90 degrees (for example, approximately grades) . The same is valid in the following. The respective grooves 62a and 62b are formed in the respective blade forming regions 56a and 56b at equal angular intervals (angle OÍ).

In addition, inner cutting unit 50 is provided with inner blade bodies 60 which are placed circumferentially. The tip ends of the respective inner blade bodies 60 are bifurcated, as shown in Figure 11, thus forming the inner blade elements 60a and 60b which respectively contact the inner surfaces of the blades 58a and 58b in the form of a groove. These inner blade elements 60a and 60b are placed in concentric annular configurations so as to correspond with the annular blade forming regions 56a and 56b of the outer cutting unit 50. With the structure described above, the slotted blade 58a and the inner blade elements 60a form an annular cutting blade assembly located around the outer circumference of the shaving unit 54 and the slotted blade 58b and the elements 60b of inner blade form another cutter blade assembly located around the inner circumference of shaving unit 54. As shown in Figure 11, in the prior art razor not only the thickness a and b of the respective slit-shaped blades 58a and 58b of the respective blade forming regions 56a and 56b of the outer cutter unit 50. they are formed to be equal (a = b), but also that the inner surfaces of the slotted blades 58a and 58b are placed in the same X plane. Due to this configuration of the outer cutter unit 50, the tip ends of the respective inner blade elements 60a and 60b of the inner cutting unit 52, which rotate while making contact with the inner surfaces of the slotted blade knives 58a and 58b are also formed so that they are placed in the same X plane. However, the conventional electric shaver described above has problems. The slots 62a and 62b of the respective slit-shaped blades 58a and 58b of the outer cutting unit 50 extend from the inner circumferences to the outer circumferences of the respective blade forming regions 56a and 56b, in a substantially radial configuration. In addition, the respective widths of the inner and outer blade forming regions 56a and 56b must be at a certain predetermined size or be larger, in order to obtain the maximum possible effective shaving area generated by the inner blade elements 60a and 60b. corresponding. Consequently, the grooves 62a and 62b are generally of a greater length than the holes formed in a blade of reciprocating or reciprocating electric shavers. In addition, the widths d of the slots 62a and 62b must also have a prescribed size or be larger in order to effectively introduce the hairs of the beard therein. Consequently, the respective slots 62a and 62b are inevitably large, and this results in the skin tending to enter these slots during shaving. Accordingly, it is necessary to form the blade-shaped blades 58a and 58b with a certain thickness so that the skin entering the slots 62a and 62b does not reach the inner cutting unit 52 and causes cutting damage. Generally, shaving is performed by holding the electric razor in one hand and pressing against the surface of the skin, by moving the shaving unit 54 around the skin.; consequently, the skin in contact with the area of the opening of the lateral surface on the outer circumferential side of the slotted blade 58a of the blade forming region 56a located on the outermost circumference of the outer cutting unit 50 it tends to undulate upwards and easily enters the slots as indicated by the arrows A. Accordingly, the thickness a of the slot-like blades 58a of the outermost blade forming region 56a must have a predetermined thickness with the order to ensure security to the user; and as a result, the thickness b of the slotted blades 58b of the inner blade forming region 56b correspondingly has a certain thickness so as to conform to the thickness a.

Therefore, it is difficult to carry out a deep shaving of the hairs of the beard in comparison with that performed by thin blades used in reciprocating electric shavers.

BRIEF DESCRIPTION OF THE INVENTION Accordingly, the present invention seeks to solve the problems described above, and the object of the present invention is to provide an electric razor which avoids deep shaving of the hairs of the beard without damaging the user's skin even with the use of a exterior cutting unit that has a slot-shaped blade. The object described before the present invention is achieved by a unique structure of an electric razor which includes external cutting units, each of which is provided with a knife-forming region of an annular shape with blades in the shape of grooves formed therein, and interior cutter units, each comprising a plurality of inner blade elements placed in an annular configuration with tip ends in contact with the inner surface of the slotted blades of the outer cutting units while rotating in relation to the outdoor cutting units; and an electric razor which is characterized in that a plurality of blade forming regions are formed in the form of concentric circles in each of the outer cutting units, and the slot-shaped blades of the blade forming regions other than the outermost blade forming region are formed thinner compared to that of the outermost blade forming region. In the structure described above, the slot-like blades in the outermost blade forming region of the outer cutting unit, where the skin is more likely to enter, are thicker than those of other blade forming regions. , and therefore, the safety of the user is established when the outer cutting units are moved while being pressed against the skin during shaving; and at the same time, since the slot-like blades of the blade-forming regions other than the outermost blade-forming region are thinner than those of the outermost blade-forming region, it can be carried out. a deep shave of the hairs of the beard. Further, when the slots, which comprise the slit-shaped blades, in the blade-forming regions other than the outermost blade-forming region are formed in a smaller amount than in the outermost blade-forming region. , each of the edges, which are formed by two adjacent slots in the blade forming regions other than the outermost blade forming region, may have a larger circumferential width when compared to the edges formed by slots therein. amount in each blade formation region; as a result, the edges have a larger cross-sectional area, and the strength of the outer cutting units can be ensured. Further, by forming the radial width of the blade forming regions other than the outermost blade forming region to be smaller than the outermost blade forming region, the slots and flanges of the blade forming regions different to the outer blade forming region may be shorter than those of the blade forming region. As a result, the amount of bending of the edges in the radial direction in such regions decreases, and the deformation of the outer cutting units during shaving can be reduced. Therefore, the resistance of the external cutting units can be ensured. In addition, by forming the interior surfaces of the plurality of blade forming regions so that they are in the same plane, the slot-shaped blades formed by the outermost blade-forming region have a greater amount of protrusion, while the slot-shaped blades formed in the blade-forming regions other than the outermost blade-forming region. They are in a slightly lowered form. As a result, close contact with the skin of the face, which is a curved surface, can be ensured.; and furthermore, since the height of the tip end of the plurality of inner blade elements of the interior cutting units need not be different, the interior cutting units can be manufactured without any complexity. Further, by adjusting the thicknesses of the slit-shaped blades formed in at least one of the blade forming regions other than the outermost blade forming region to be in the range of 0.04 mm to 0.07 mm, such a thickness is substantially the same as that of a foil blade used in a reciprocating electric shaver, and a deep shaving of the hairs of the beard can be carried out in a favorable manner. In addition, the objective is met by a unique structure of an electric razor which includes outer cutting units, each of which is provided with an annular blade-forming region with slot-shaped blades formed in the same, and interior cutting units, each comprising a plurality of inner blade elements placed in an annular configuration with their tip ends contacting the inner surface of the slotted blades of the outer cutting units while rotating in relation to the outer cutting units, and wherein the plurality of blade forming regions are formed in a form of concentric circles in each of the outer cutting units, and the grooves constituting the slot-shaped blade of the forming regions of blades different to the outermost blade formation regions t They have widths in the circumferential direction greater than the grooves formed in the innermost blade formation region.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a partially cross-sectional view of essential portions of a general construction of an electric razor, in accordance with the present invention; Figure 2 is a sectional view of the essential portion of the internal structure of the head of the electric razor shown in Figure 1; Figure 3 is a top view of one of the outer cutting units of the present invention; Figure 4 is a sectional view of the outer cutting unit shown in Figure 3, wherein the internal surfaces of the slit-shaped blades are adjusted to be in the same plane; Figure 5 is a sectional view of an outer cutting unit according to another embodiment of the present invention, wherein the outer surfaces of the slot-shaped blades are adjusted to be in the same plane, - Figure 6 is a top view of the cutting unit according to another embodiment of the present invention, wherein the grooves in the blade forming region of the inner side is an amount smaller than that of the outermost blade forming region; Figure 7 is a top view of an outer cutting unit according to a further embodiment of the present invention, wherein the width of the blade forming region of the inner side is narrower than that of the blade forming region more Exterior; Figure 8 is a sectional view of Figure 7; Figure 9 is a top view of an outer cutting unit according to another embodiment of the present invention, wherein the width of the grooves formed in the blade forming region of the inner side is greater than that of the forming region. of outermost blade, - Figure 10 is a top view of a conventional outer cutting unit; and Figure 11 is a sectional view thereof.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Next, a preferred embodiment of an electric razor in accordance with the present invention will be described in detail, with reference to the accompanying drawings. The constituent elements which are the same as in a conventional razor are marked with the same reference number, and the detailed description thereof is omitted. First, the general construction of an electric razor 10 should be delineated. In the embodiment shown, an electric razor has three shaving units, each constituted of a circular outer cutting unit 14 and a circular inner cutting unit 18; however, the same description is applicable to an electric razor having one or two shaving units, or an electric razor which has four or more shaving units, - The upper portion of the electric razor 10 in figure 1 is a shaving head 12; and three shaving units 16 are provided therein (only two are clearly shown) so that the outer cutting units 14 thereof are exposed outside the head 12 of the razor. The electric razor 10 further includes a housing 22 which is made of synthetic resin. The housing 22 contains therein a drive mechanism 20 for the interior cutting units 18, an electric motor 24 located below the head of the razor 12, so as to drive the drive mechanism 20, a battery 26 which supplies electric current to the electric motor 24, a connector 28 installed in the lower end of the housing 22 so as to supply a charging current to the battery 26 from the outside, and a slidable switch 30 provided in the front of the housing 22 so that it is used to turn on and off the power supply from battery 26 to electric motor 24. It will be described with reference to figure 2, the internal construction of the head of the head 12 shaver of the electric razor r.O. The upper end of the head 12 of the razor is open and covered by a removable head frame 32 which is snapped into the housing 22. A cutter retainer frame 36 removably attaches to the interior surface of the frame 32 of the razor. the head by means of a connecting screw 34 so that the outer cutting units 14 and inner cutting units 18 are maintained between the cutter retainer frame 36 and the head frame 32, thus preventing these cutting units from detaching from the head 12 of the head. razor. In addition, coupling elements 40 are attached to the central portions of the interior cutting units 18. The coupling elements 40, made of a synthetic resin, are coupled with the tip ends of the drive shafts 38 (which constitute a part of the drive mechanism 20), so that the inner cutting units 18 are rotated by the drive shafts 38. The tip ends (upper ends in FIG. 2) of these coupling elements 40 are inserted loosely into the tubular portions 42a formed on the lower surfaces of the disc members 42 securely attached to the central portions of the units. 14 external cutters, and in this way the centers of the interior and exterior cutters 18 and 14 are aligned axially. The drive shafts 38 constantly drive up the cutting units 18 (or towards the outer cutting units 14) by springs (not shown). The rotational force of the electric motor 24 is transmitted to the drive shafts 38 by a transmission mechanism (not shown) which comprises a gear mechanism, etc. and they constitute a part of the drive mechanism 20. The structures of the outer cutting units 14 and the interior cutting units 18, which characterize the present invention, will be described with reference to Figures 3 and 4. As in the prior art razors, in each of the outer cutting units 14 concentrically form two annular shaped blade forming regions 56a and 56b, and a plurality of grooves 62a and 62b of the same width are formed in the circumferential direction so as to extend substantially in one direction radially in the respective blade forming regions 56a and 56b, so that the slotted blades 58a and 58b are formed in the blade forming regions 56a and 56b. For slotted blades 58a, the side walls of each of the edges 64a formed by two adjacent slots 62a in the outermost blade forming region 56a act as blade surfaces to cut hairs from the beard; and similarly, for the slotted blades 58b, the side walls of each of the edges 64b formed by two adjacent slots 62b of the inner blade forming region 56b act as blade surfaces to cut hairs from the beard, as it is observed in figure 3. Furthermore, the inner cutting unit 18 has a plurality of inner blade bodies 60 (only two are shown in figure 4) which are placed circumferentially. The tip ends of the respective inner blade bodies 60 are bifurcated so as to form the inner blade elements 60a and 60b which contact the inner surfaces of the slotted blades 58a and 58b, respectively. The respective inner blade elements 60a and 60b are placed in concentric annular configurations so as to correspond to the blade forming regions 56a and 56b which are also in concentric annular configurations. Slot-shaped blades 58a and inner blade elements 60a form an outer annular cutting blade assembly 5 which is located around the outer circumference of each circular shaving unit 16, and slot-shaped blades 58b the inner blade elements 60b form an inner cutting blade assembly which is located around the circumference of each circular shaving unit 16, as shown in Figure 4. As seen from Figure 4, unlike the prior art razors, in each of the outer cutting units 14 the present invention, The thickness b of the slotted blades 58b that is formed in the inner blade forming region 56b is designed to be as small as the thickness a of the slotted blades 58a formed in the forming region 56a of outermost blade (a > b). By considering both the resistance As the proper shaving depth of the whisker hairs, a thickness of 0.04 mm to 0.07 mm, which is approximately the same thickness as that of the blade blade, is preferable for the thickness b of the blades 58b in the form of Slot of the inner blade forming region 56b.

In addition, the inner surfaces of the slot-shaped blades 58a and 58b of the respective blade forming regions 56a and 56b are formed so that these inner surfaces are all placed on the same X plane. Due to the structure described in the foregoing, since the slot-like blades 58a formed in the blade forming region 56a, placed on the outermost circumference of each outer cutting unit 14 (where the skin's entrance is most likely) remain so thick as in conventional electric razors, user safety is ensured when the outer cutting units 14 move around, while being pressed against the surface of the skin during shaving. At the same time, since the slotted blades 58b in the inner blade forming region 56b are formed as thin as a blade blade, the deep shaving of the beard hairs can be carried out by these blades 58b in the form of a groove. Therefore, a deep shaving of the beard hairs can be carried out using the electric razor 10 in its entirety. In the outer cutter unit 14 shown in FIG. 4, the slot-like blades 58a of the outermost blade forming region 56a have the greatest amount of protrusion, while the slotted blades 58b located on the inner side of it are slightly lower compared to the groove-shaped blades 58a. Accordingly, a close contact of the skin 44 of the user's face is improved, which is a curved surface and therefore efficient shaving is ensured. Furthermore, since there is no need to differentiate the height of the tip ends from the plurality of inner blade elements 60a and 60b of each inner cutting unit 18, the manufacture of the interior cutting units 18 is not complicated. In the above embodiment, the inner surfaces of the respective slot-shaped blades 58a and 58b of each outer carrier unit 14 are formed so that they are all placed in the same X plane. However, it is also possible, as shown in FIG. Figure 5, forming the outer surfaces of the respective blade forming regions 56a and 56b of each outer cutting unit 14, ie, the outer surfaces of the slotted blades 58a and 58b, so that they are placed on the same plane Y. In this case, the height of the tip ends of the plurality of inner blade elements 60a and 60b of the inner carrier unit 18 varies so as to make contact with the inner surfaces of the blades 58a and 58b in shape of slot, and the inner blade elements 60b have a greater amount of height compared to the outer blade elements 60a.

In the foregoing, since the thickness b of the blade 58b in the form of an internal groove is reduced, the force of the inner blade forming region 56b of the outer carrier unit 14 can be decreased compared to the force obtained in a conventional electric shaver. So that, to compensate for this, as shown in the embodiment of Figure 6, the inner blade forming region 56b is formed with a smaller number of grooves 62b compared to the outermost blade forming region 56a. With this structure, the width of the edges 64b in the circumferential direction of the inner blade forming region 56b is consequently increased, as a result, a larger cross-sectional area is obtained for the edges 64b of the forming region 56b of inner blade in comparison with the case in which the same number of slots 62a and 62b are formed in blade forming regions 56a and 56b. Therefore, this increases the strength of the inner blade forming region 56b and the strength of the outer cutting unit 14 can be secured in its entirety. In Figure 6, the number of slots 62b of the inner blade forming region 56b is set to be, for example, half the number of slots 62a of the outermost blade forming region 56a. However, this ratio can be selected as desired, according to the radial width of the region 56b, of blade formation, the width d of the grooves 62b and the thickness of the outer cutting unit 14, etc. Similarly, as shown in Figures 7 and 8, the width e of the inner blade forming region 56b in the radial direction can be made smaller than the width f of the outermost blade forming region 56a with the In order to avoid a decrease in the strength of the outermost blade forming region 56b of each outer carrier unit 14. With this structure, since the lengths of the grooves 62b are shortened at edges 64b in the inner blade forming region 58b, the thickness b of the inner groove-like blades 58b is reduced, which does not cause the amount to increase. of bending the edges 64b in the radial direction, and therefore, deformation of the outer carrier unit 14 during shaving can be reduced. Accordingly, the strength of the outer cutting unit 14 can be ensured. In the embodiment shown in Figure 9, it states that the width d of the grooves 62b of the inner blade forming region 56b in the circumferential direction is greater than the width d of the grooves 62a of the forming region 56a. outermost blade. As a result of this formation, it is possible to carry out a deep shaving due to the wider slots 62b, and this effect can be obtained even if the slotted blades 58a of the outermost blade forming region 56a and the blades 58b in the form of a slot in the inner blade forming region 56b have the same thickness. In the embodiments described above, the blade forming regions of the outer cutting units 14 and the inner blade elements of the inner cutting units 18 are formed in a double annular configuration, - however, the same construction can be used even in in which slot-like blades and inner blade elements are formed in a multiple configuration such as triple, quadruple or even multiple annular greater configurations. In any construction in which a plurality of blade forming regions are formed in the outer cutting unit, it is sufficient if the slotted blades of the blade forming regions other than the outermost blade forming region, that is, the blade forming regions located near the center, are formed thinner than the slotted blades of the outermost blade forming region or have wider grooves in comparison with those of the blade forming region. outermost. Various descriptions are provided in the foregoing with reference to the preferred embodiments of the present invention. Nevertheless, the present invention is not limited to the embodiments described above, and it is not necessary to say that many modifications can be made without departing from the spirit of the present invention. According to the electric razor of the present invention, when the outer carrying units are moved while being pressed against the surface of the skin during shaving, the safety of the user is guaranteed, since the slot-shaped blades formed in the region of blade formation located on the outermost circumference of each outer cutting unit, where the entrance of the skin is more likely, it is formed thicker than other slotted blades, and at the same time, the thickness of the Slot-shaped blades in the outer blade forming regions are made smaller so that a deep shaving of the whisker hairs can be carried out. Furthermore, although the inner groove-shaped blades are formed thinner, since the opening area of such slot-shaped blades is small, the strength of the outer cutting units is guaranteed. In addition, the slotted blades of the outermost blade forming region of each outer cutting unit have the greatest amount of protrusion, the slotted blades in other blade forming regions located near the center of the cutting unit. outside are pressed lightly; consequently, close contact with the skin of the face, which has curved surfaces, is improved; and efficient shaving can be carried out. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, property is claimed as contained in the following:

Claims (9)

1. An electric razor, characterized in that it comprises an outer cutting unit provided with a plurality of grooves that form slot-shaped blades in a knife-forming region, of an annular shape, and an inner cutting unit provided with a plurality of elements of inner blades placed in an annular configuration with tip ends thereof in contact with inner surfaces of the slit-shaped blades and rotating relative to the outer cutting unit, wherein a plurality of blade forming regions are formed in the form of concentric circles in the outer cutting unit, and a thickness of slot-shaped blades is formed in a blade-forming region different from an outermost blade-forming region, which is smaller than the thickness of the blades. slot-shaped blades in the outermost blade formation region.

2. The electric razor according to claim 1, characterized in that the grooves of the slot-shaped blades in the blade-forming region different from the outermost blade-forming region are smaller in amount than the grooves of the blades. slot-shaped blades of the outermost blade formation region.

3. The electric razor according to claim 1 or 2, characterized in that the blade forming region other than the outermost blade forming region is smaller in width in the radial direction than the outermost blade forming region. .

4. The electric razor according to claim 1, 2 or 3, characterized in that the inner surfaces of the groove-shaped blades that are formed in the blade-forming regions are placed in the same plane.

5. The electric razor according to claim 1, 2, 3 or 4, characterized in that the thickness of the slot-shaped blades that are formed in the blade-forming region different from the outermost blade-forming region is in the range of 0.04 mm to 0.07 mm.

6. The electric razor according to claim 1, 2 or 3, characterized in that the outer surfaces of the slot-shaped blades that are formed in the blade-forming regions are placed in the same plane.

7. The electric razor according to claim 6, characterized in that the thickness of the slot-shaped blades that are formed in the blade-forming region other than the outermost blade-forming region is in the range of 0.04 mm to 0.07 mm.

8. The electric razor according to claim 1 or 2, characterized in that the grooves in the blade forming region other than the outermost blade forming region are greater in width in the circumferential direction, compared to the grooves in the outer groove. the outermost blade formation region.

9. An electric razor characterized in that it comprises at least one circular outer cutting unit provided with an outermost annular knife forming region and at least one inner annular knife forming region which is concentrically placed, each of the regions ring knife forming is formed with a plurality of slots extending in the radial direction of the circular outer cutting unit and at least one inner cutting unit is provided with a plurality of inner blade elements placed in an annular configuration with the ends tip of the same, in contact with inner surfaces of the slit-shaped blades of at least one outer cutting unit rotating in relation to at least one outer cutting unit, wherein each of the plurality of slots that are form in at least one of the inner blade forming regions has a width in circumferential direction greater than each of the plurality of grooves formed in the outermost blade forming region.