JP2006218218A - Rotary type electric razor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve sharp cutting feel when an electric razor is used with an outer blade lightly touching the skin while preventing excessively deep cutting. <P>SOLUTION: The electric razor comprises an outer blade frame 18 mounted on a body 10, the outer blade 14 supported to the outer blade frame 18, having hair insertion holes 30a and 30b on annular thin layers 28a and 28b whose upper surfaces are shaving faces, and an inner blade 16 with a blade body rotating while sliding in contact with the lower surfaces of the thin layers for cutting hair inserted into the hair insertion holes. The hair insertion holes 30a and 30b are slit-shaped crossing the thin layers 28a and 28b almost in the radial direction, and the width of the slits are narrow at both ends of the crossing width in the radial direction of the thin layers 28a and 28b and wide at least in part of the intermediate area in the radial direction of the thin layers. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In this invention, the upper surface of the annular thin layer formed on the outer blade is used as a shaving surface, and the inner blade is rotated from below to rotate on the lower surface of the thin layer so as to enter the wrinkle introduction hole formed in the thin layer. It relates to a rotary electric razor that cuts a ridge with an inner blade.

  In this type of electric razor, the wrinkle introduction hole formed in the thin layer of the outer blade is made into a slit shape, and when the skin is strongly pressed into this wrinkle introduction hole (hereinafter also referred to as slit), the skin enters from the slit and is cut by the inner blade. The skin may become excessively deeply shaved or irritated after shaving. Obviously, the outer blade should be thicker to prevent such inconvenience. Here, increasing the thickness of the outer cutter means increasing the dimension in the thickness direction of the rib sandwiching the slit (dimension in the direction parallel to the rotation axis of the inner cutter). However, if this is done, the distance between the skin and the inner blade increases, which causes a problem that the heel cannot be appropriately shaved.

JP-A-11-4980

  In order to prevent such inconvenience, in Patent Document 1, as shown in FIG. 5, a plurality of concentric circular shapes centering on the central axis A are formed on the lower surface of the annular thin layers 1 </ b> A and 1 </ b> B formed on the outer cutter 1. The inner blade travel groove 2 (2a, 2b) is made thicker, and the slit blade 3a (rib) provided in the innermost blade running groove 2a on the outermost peripheral side is thickened, and the slit shape provided in the innermost blade running groove 2b on the innermost peripheral side. It has been proposed to make the blade 3b thinner. In FIG. 5, reference numeral 4 denotes an inner blade, and 4a and 4b denote small blades that run while sliding in contact with the inner blade running grooves 2a and 2b from below. The thin layers 1A and 1B are actually very thin, but in FIG. 5, the thickness is exaggerated for easy understanding.

  FIG. 6 is a plan view of the outer blade 1. Two annular thin layers 1A and 1B centering on the central axis A are formed on the upper surface of the outer blade 1, the upper surface is a shaved surface 5 (5a, 5b), and the lower surface is an inner blade running groove 2a, 2b. It becomes. An annular groove 6 that opens to the upper surface is formed between the two shaving surfaces 5a and 5b.

  In the thin layers 1A and 1B, slit-like long wrinkle introduction holes 7a cross substantially in the radial direction. In the outer thin layer 1A, a short wrinkle introduction hole 7b is formed between the adjacent long wrinkle introduction holes 7a and 7b in a substantially radial direction. The slit blade 3a of the outer thin layer 1A is formed between the long ridge introduction hole 7a and the short ridge introduction hole 7b. The slit-like blade 3b of the inner thin layer 1B is formed between the long flange introduction holes 7a and 7a.

  In the case of the electric razor shown in Patent Document 1, when the shaving surfaces 5a and 5b, which are the upper surfaces of the thin layers 1A and 1B, are moved against the shaving portion of the face and moved, the skin hits the outer periphery of the outer blade. As a result, the pressing force increases on the outer peripheral side of the outer blade, so that the thickness on the outer peripheral side of the outer blade is increased to prevent excessive shaving. Further, paying attention to the fact that the pressing force is reduced on the inner peripheral side, by reducing the thickness on the inner peripheral side of the outer cutter, an appropriate shave is made possible on the inner peripheral side.

  In the thing shown by patent document 1, when the outer blade was applied to skin and moved, the use condition that the pressing force became large when the skin hits the outer peripheral edge of the outer blade and wrinkles was assumed. However, under actual usage conditions, the outer blade is often moved lightly against the skin. In this case, a large wrinkle cannot be formed on the outer peripheral edge of the outer blade, and the shaving taste is not sufficiently improved.

  The present invention has been made in view of such circumstances, and provides a rotary electric razor that can obtain a good shaving taste even when used with the outer blade lightly applied to the skin while preventing excessive deep shaving. The purpose is to do.

  According to the present invention, the object is to provide an outer blade frame mounted on the main body, an outer blade that is held by the outer blade frame and has a flange introduction hole in an annular thin layer whose upper surface is a shaving surface, and the thin layer In a rotary electric shaver provided with an inner blade having a blade body that rotates while sliding in contact with the lower surface and cuts the rod that has entered the rod introduction hole, the rod introduction hole substantially crosses the thin layer substantially in the radial direction. This is achieved by a rotary electric shaver that is slit-shaped and has a slit width that is narrow at both ends in the transverse width in the radial direction of the thin layer and wide at least at a part of the intermediate portion.

  The wrinkle introduction hole has a substantially slit shape that substantially traverses the thin layer in the radial direction, and this slit is formed within the transverse width of the shaving surface and the slit width is narrow at both ends in the longitudinal direction and wide at least at the middle portion. Therefore, when the outer blade is pressed against the skin and moved, the skin wrinkle formed on the outer peripheral edge of the outer blade hardly enters the wrinkle introduction hole from the narrow slit width portion (narrow width portion). For this reason, excessive shave is less likely to occur. In addition, when the outer blade is pressed lightly against the skin, there is a wide slit part (widened part) in the middle part of the crossed width of the shave surface, so that the skin can penetrate deeply into this wide slit part and moderate shave Is possible.

  In addition, the wrinkle introduction hole has a narrow slit width at both ends within the transverse width of the thin layer, and skin wrinkles formed on the outer peripheral edge of the outer blade are difficult to enter the wrinkle introduction hole when the outer blade is pressed against the skin and moved. The blade thickness can be reduced. For this reason, it becomes possible to shave appropriately.

  It is desirable that the wrinkle introduction hole is formed along a straight line inclined at a certain angle in the rotation direction of the inner blade on a certain radius with respect to the radial direction of the outer blade. That is, since the outer periphery side of the soot introduction hole is displaced in the rotational direction of the inner blade from the inner periphery side, the shavings cut by the cutting edge of the inner blade are easily blown to the outer periphery side. For this reason, it becomes difficult for dust to collect on the center side of the inner blade, and it becomes easier to clean the waste.

  The outer blade may be provided with a plurality of annular and concentric shaving surfaces. In this case, the wrinkle introduction hole can be made long so as to cross both shaved surfaces in a substantially radial direction. However, in this case, the interval between the adjacent wrinkle introduction holes on the outer shaving surface having a long circumference is excessive. Therefore, it is preferable to form a short wrinkle introduction hole between the long wrinkle introduction holes on the outer shaved surface (Claim 3).

  1 is an external perspective view of an embodiment of the present invention, FIG. 2 is a side sectional view of a blade unit that combines an outer blade and an inner blade, FIG. 3 is a plan view of one outer blade, and FIG. 4 is a partially enlarged view thereof. It is sectional drawing.

  In FIG. 1, reference numeral 10 denotes a main body, and 12 denotes a blade head part attached to the upper part of the main body so as to be openable and detachable. Three sets of blade units 17 formed of an outer blade 14 and an inner blade 16 to be described later are attached to the blade head portion 12. The center of the outer blade 14 corresponding to the three blade units 17 is located at the apex of an equilateral triangle.

  The blade head portion 12 has an outer blade frame 18 (FIG. 1) that can be opened and closed upward or detachable with respect to the main body 10. The outer blade 14 is mounted in three outer blade mounting holes formed in the outer blade frame 18. The blade unit 17 including the outer blade 14 is biased upward, that is, in a direction in which the outer blade 14 protrudes upward.

  The outer cutter 14 is made of a metal plate and has a substantially bowl shape that protrudes upward (FIGS. 2 and 3). The upper part of the outer blade 14 is circular, and a substantially circular opening 20 is formed at the center of the circular portion, and a cap 22 is fixed to the upper part from above. An engagement hole 24 is formed in the lower surface of the cap 22. The engagement hole 24 is engaged with a tip of an inner blade 16 described later to prevent the inner blade 16 from swinging.

  In the circular upper portion of the outer cutter 14, one annular groove 26 is formed centering on the central axis A that is the center of rotation of the inner cutter 16 when viewed from above (FIG. 2). -The thin layer 28a, 28b (FIG. 3) used as an outer pair of cyclic | annular shaving surface is formed. The upper surfaces of the thin layers 28a and 28b become shaved surfaces, and the lower surfaces become inner blade running grooves 34a and 34b described later.

  The outer blade 14 traverses only the thin slit-like long holes 30a and the outer thin layer 28b in the radial direction from the central axis A (FIG. 2) across the thin layers 28a, 28b. A short wrinkle introduction hole 30b is formed. That is, the short wrinkle introduction holes 30b are alternately arranged with the long wrinkle introduction holes 30a. These wrinkle introduction holes 30a and 30b are along a straight line D inclined by a constant angle θ in the rotation direction R of the inner blade 16 on a circle C having a constant radius with respect to the straight line B in the radial direction passing through the central axis A in FIG. Is formed.

  These wrinkle introduction holes 30a and 30b have narrow portions E and F having narrow slit widths at both ends in the transverse width in the radial direction of the thin layers 28a and 28b, and one widened portion in which the slit width is widened in the middle portion. Hold G (FIG. 4). The narrow portions E and F and the wide portion G are formed separately for the thin layers 28a and 28b. In this embodiment, the widened portion G has a substantially barrel shape in plan view as shown in FIGS.

  The lower surfaces of the ribs 32a and 32b remaining between the adjacent wrinkle introduction holes 30a and 30a on the inner thin layer 28a and between the adjacent wrinkle introduction holes 30a and 30b on the outer thin layer 28b are It becomes a blade that cuts the ridges in cooperation.

  The upper surface of the outer cutter 14, that is, the upper surfaces of the ribs 32a and 32b is located on a plane perpendicular to the central axis A (the central axis A is a perpendicular) as shown in FIG. That is, the upper surfaces of the ribs 32a and 32b are flat.

  The lower surfaces of the thin layers 28a and 28b of the outer cutter 14 (that is, the lower surfaces of the ribs 32a and 32b) are inner cutter running grooves (annular tracks) 34a and 34b, respectively. These inner blade running grooves 34a and 34b are surfaces on which one inner surface (bottom surface) is mounted on one plane H perpendicular to the central axis A when viewed from below (from the inside). This plane H coincides with the lower surfaces of the ribs 32a and 32b. The lower surface is polished by a grindstone, and blades are formed on the lower edges of the ribs 32a and 32b.

  The inner blade 16 has a resin boss portion 36 that opens downward, and a large number of blade bodies 38 that surround the boss portion 36 and are fixed at equal intervals in the circumferential direction. Many blade bodies 38 may be connected in an annular shape. The upper portion of the blade body 38 is bifurcated, and the two small blades 40a and 40b which are the branched portions are in sliding contact with the inner blade traveling grooves (tracks) 34a and 34b from below. The upper edges of the small blades 40a and 40b become blades that are horizontally polished along the plane H, that is, blade edges 40A and 40B.

  The small blades 40a and 40b of the inner blade are located on a radial line I passing through the central axis A as shown in FIG. Strictly speaking, the inner blade 16 rotates in the clockwise direction R in FIG. 3, and the upper edges of the small blades 40a and 40b in the rotational direction R become the blade edges 40A and 40B and are positioned on the straight line I. Therefore, if the inner blade 16 rotates in the R direction, the angle between the cutting edges 40A, 40B of the small blades 40a, 40b and the scissors introducing holes 30a, 30b is an inclination angle on the circle C having a constant radius of the scissors introducing holes 30a, 30b. equal to θ. As the inner blade 16 rotates, the crossing position of the blade tips 40A, 40B and the scissors introducing holes 30a, 30b moves radially outward, so that the sandwich angle (= θ) changes with the rotation of the inner blade 16. Since the sandwiching angle θ is an acute angle that always opens outward in the radial direction, the sharpness of the ridge is good.

  In FIG. 2, the boss portion 36 is formed with a rectangular engagement hole 42 that opens downward, and the drive shaft 44 protruding from the main body 10 is engaged therewith. A square spherical engagement head 46 is formed at the upper end of the drive shaft 44, and engages the engagement hole 42 of the boss portion 36 from below. The drive shaft 44 is rotationally driven by a motor (not shown) housed in the main body 10 to rotate the inner blade 16.

  The drive shaft 44 has a returning behavior in a direction protruding upward, and presses the inner blade 16 upward. For this reason, the small blades 40a and 40b of the inner blade 16 elastically press the inner blade traveling grooves 34a and 34b of the outer blade 14 from below. The outer blade 14 is formed with a flange 48 projecting in the outer diameter direction on the outer periphery thereof, and the flange 48 is engaged with the inside of an outer blade mounting hole (not shown) of the outer blade frame 18 from below. For this reason, the blade unit 17 including the outer blade 14 and the inner blade 16 can sink downward with elasticity with respect to the outer blade frame 18.

  According to this embodiment, the narrow blades E and F having a narrow slit width are provided at both ends within the radial transverse width of the blade forming regions 28a and 28b in the flange introduction holes 30a and 30b of the outer blade. When 14 is pressed against the skin and moved, the skin hardly enters the wrinkle introduction holes 30a and 30b. For this reason, excessive shave can be prevented. For this reason, since the thickness of the outer cutter 14, that is, the dimension in the direction parallel to the central axis A of the ribs 32a and 32b can be reduced, the shaving taste can be improved.

  Further, since the widened portion G is provided in the intermediate portion within the transverse width in the radial direction of the thin layers 28a and 28b, when the outer blade 16 is pressed against the skin, the heel enters the widened portion G sufficiently deeply. For this reason, moderate shave is also possible.

  Of course, the present invention is not limited to this embodiment. For example, the shape of the widened portion G of the soot introduction holes 30a and 30b may be a long oval shape instead of a barrel shape, or a rectangular shape with smooth corners. However, in order to protect the skin, it is desirable to make the connecting portion between the narrow width portions E and F and the wide width portion G as smooth as possible. Such an outer cutter can be processed by etching, for example.

  The outer cutter is not limited to one having two thin layers 28a and 28b and inner cutter running grooves 34a and 34b. Further, the shaving surface on the upper surface of the outer blade is not limited to the one positioned on the plane, and may be a curved surface that protrudes upward or downward on a longitudinal section taken along a radial plane including the central axis A.

1 is an external perspective view of an embodiment of the present invention. Side sectional view of blade unit Front view of one outer blade Sectional view of the IV arrow Side sectional view showing the prior art A plan view of the outer blade

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body 12 Head part 14 Outer blade 16 Inner blade 17 Blade unit 18 Outer blade frame 26 Annular groove 28a, 28b Thin layer 30a, 30b 髭 Introducing hole 32a, 32b Rib 34a, 34b Inner blade traveling groove (track)
40a, 40b Small blades 40A, 40B Cutting edges B, I A straight line in the radial direction passing through the central axis A D A straight line along the longitudinal direction of the introduction hole A A central axis H A plane perpendicular to the central axis (a plane in which the central line is vertical)
R Rotation direction of inner blade E, F Narrow part G Wide part

Claims (3)

An outer blade frame mounted on the main body, an outer blade having a flange introduction hole in an annular thin layer held on the outer blade frame and having a shaved surface on the upper surface, and rotating while making sliding contact with the lower surface of the thin layer In a rotary electric razor provided with an inner blade having a blade body for cutting a rod entering the introduction hole,
The wrinkle introduction hole has a substantially slit shape that substantially traverses the thin layer in the radial direction, and the slit width is narrow at both ends within the radial transverse width of the thin layer and is formed wide at least at a part of the intermediate portion. A rotary electric razor characterized by   2. The rotary electric shaver according to claim 1, wherein the scissors introducing hole is formed along a straight line having a constant radius with respect to the radial direction of the outer blade and inclined by a predetermined angle in the rotation direction of the inner blade. The outer blade has a plurality of annular and concentric thin layers, and the heel introduction hole crosses only the outer thin layer between the long heel introduction hole that crosses both thin layers in a substantially radial direction and the adjacent long heel introduction hole. The rotary electric shaver according to claim 1 having a short scissor introduction hole.

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