US2119021A - Shaving apparatus - Google Patents

Shaving apparatus Download PDF

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US2119021A
US2119021A US185108A US18510838A US2119021A US 2119021 A US2119021 A US 2119021A US 185108 A US185108 A US 185108A US 18510838 A US18510838 A US 18510838A US 2119021 A US2119021 A US 2119021A
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shear plate
cutter
shaving
plate
shearing
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US185108A
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Frederick E Moskovies
Victor B Abrams
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Frederick E Moskovies
Victor B Abrams
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B26HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26BHAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/14Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the rotary-cutter type; Cutting heads therefor; Cutters therefor

Description

y 3 938. F. E. MosK ovlcs ET AL 2, 9,021
SHAVING APPARATUS .Filed Jan. 15, 1938 .111 Ill Tittle/14f E 140.? (ll/12's BY alorfif flkrams very small effective shearing zone.
Patented May 31, 1938 PATENT ()FFICE 2,119,021 SHAVING APPARATUS Frederick E. Moskovics, Greenwich, Court, and Victor B. Abrams, Maplewood, J.
Application January 15, 1938, Serial No. 185,108
7- Claims.
This invention relates to shaving devices and has, particular reference to the class of shaving devices kno 'n as latherless or dry shaving devices.
Dry shaving devices generally are provided with an apertured outer skin-engaging shear plate of comparatively small size and have a This small shearing zone enables the severance of only a small amount of hair during a movement over the skin and consequently an extended length of time is required to obtain a complete and smooth shave. Also, the teeth of the cooperating inner cutter are of such relatively large size compared to the outer shear plate hair receiving apertures that the latter are blocked by the inner cutter during a large proportion of the shaving time so that the shaving time is further "increased.
Also, those hairs that are engaged by the outer shear plate when the corresponding apertures are so blocked are not sheared, which necessi-v tates repeated applicationoi the device to the same area of the skin to. shear all of the hairs. Furthermore, since the movement of the inner cutter is relatively slow, particularly with the reciprocating cutter. type, the blades or teeth must be maintained sharp in order to provide a smooth shave without pullingr An objectof this invention is toF'EiprQ'Yide -a dry shaving device-which hasa greatly-increased efiective shaving area, whereby the total shaving time is'materially decreased.
Another object oithe invention is "to provide fadryj, shaving device inwhich the, inner cutter lades are of a small area as compared to the total efl'ectivearea of the outer shear plate wherebyitlie tendency of the inner cutter blades to block entry of the hair into the shaving zone is materially reduced.
Another object of the invention is to provide a dry shaving device in which the severance of the hairs is efiectedby impact between the shearing edges of the shear plate and the inner cutter, whereby effective shaving is obtained without the necessity of especially sharp shearing edges and withoutcausing pulling for that reason.
vAnother object of the invention is to provide a rotary type or dry shaving device in which the inner cutter is applied into intimate shearing I engagement with the shear plate at least partially by centrifugal force, whereby a clean severance of the hairs is insured.
Another object of the invention is to provide a dry shaving device which is instantaneously self-clearing of severedhairs by reason of the construction and mode of operation of the inner cutter, whereby shaking, tapping, or blowing of the device to dislodge the severed hairs.becomes unnecessary.
Another object of the invention is to provide a dry shaving device in which the skin contacting shear plate and inner cutter are bodily relatively movable, whereby the hairs between the shear plate apertures are sought and severed and an improved shearing action due to their relative movement is effected.
An additional .object of the invention is to provide a dry shaving device having an improved type of skin contacting shear plate which is characterized by extreme thinness and which is so shaped and so supported as to provide great rigidity,
'lfhese objects of the invention have been attained by the provision of a dry shaving device having a generally dome-shaped or convex skincontacting shear plate pierced by a plurality of apertures of selected shape disposed in relatively closely-spaced relation over substantially its entire area, the under surface of this shear plate being intimately engaged by an inner cutter having one or more shearing edges thereon which are rotated about an axis perpendicular to or axially disposed with respect to the dome-shaped shear plate. A dome-shaped and substantially circular shear plate has the material advantage that it can be of substantially any desired thinness and area within practical limits and, because of its curvature is far more rigid, even p when extremely thin, than a shear plate of flat or cylindrical form and of the same thickness, as well as having the property of stretching the skin and conforming to the contours of the face because of its curvature.
In the preferred form of the device the domeshaped shear plate is provided with a great number of hair-receiving apertures which may be distributed uniformly or non-uniformly throughout its area and have any desired shape, said apertures being of suiiicient size to allow passage of hairs and the edges of the apertures act as individual shearing edges cooperating with the rotary inner cutter shearing edges to sever the hairs close to the-skin.
The rotary inner cutter may have, as indicated above, one or more shearing edges, preferably provided by two or four blades which are disposed normally to the inner surface of the dome-shaped shear plate. The blades may be spring-pressed as a group against the underside of the dome-shaped shear plate, and/or they may -.required to cut the hair. operating characteristics will become. apparent upon examination of the accompanying drawing-. 1
be individually supported in inclined grooves so arranged in a rotary supporting structure that the centrifugal force of rotation will force themintimately against the under surface of the shear plate. The blades are preferably individually narrow, whereby they will only block a comparatively small proportion of the total area of the shear plate apertures. a
The inner cutter is preferably rotated at a relatively high speed and provided with substantial mass so that it acts as a flywheelin operation. and has considerable momentum and consequently its edges cooperate with the outer cutter to sever the hairs by an impact shear action which insures clean severance of the hairs without requiring especially sharp shearing edges. This flywheel effect also smoothes the operation of the driving motor. Preferably, the body of the inner cutter at points between its blades is spaced closely to the underside of the shear plate, so that in the event of flexing of an extremely thin shear plate, the inner cutter body supports it against deformation.
The rotation of the inner cutter also immediately ejects the severed hairs outwardly and away from between the shear plate and the inner cutter body by centrifugal action, thereby rendering the device self-clearing. The rotation of the inner cutter also may be utilized, through suitable eccentric connections, to cause the skin-contacting shear plate to gyrate, thereby working the plate over the face mechanically inaddition to themane ual manipulation of the device and facilitatingen try of the hairs into the apertures. The gyratory motion of the shear plate and the rotary movement of the inner cutter also produce'an im-'-- in which:
Figure 1 is an elevation of a I ment of a dry shaving device of the present invention;
Fig. 2 is an end view thereof;
' Fig. 3 is an enlarged end view of the razor with the skin contacting shear plate removed showing thearrangement of the inner cutter;
Fig. 4 is an enlarged view in vertical section of the head of the device of Fig. 1;
Fig. 5 is an end view, shown partly in section and partly broken away, of a modified form of a dry shaving device embodying the present invention;
Fig. 6 is an axial section, as seen along the line 6-6 of Fig. 5; I
Fig. 7 is a perspective view of one form of rotary inner-cutter; I
Fig. 8 is an axialsection through a modified form of shear plate and rotary inner cutter assembly; and 1 Fig. 9 is an axial section through another form of shear plate and rotary inner cutter assembly.
A dry shaving razor illustrated in Figure 1 consists of a handle Ill containing an electric motor of known type and having mounted at one end thereof a shearing orshaving head I2, which consists of a tubular shell ll attached by means of a screw IE or other suitable means, to the end of the handle l0. As best shown in Fig. 4, the shell I4 is provided with a threaded portion 48 at its upper end upon which may be screwed an Other structural preferred embodiannular cap member or ring 20 having a thi inwardly-projecting flange 22 at its upper end.
Secured to the ring 20 beneathits flange 22 is a dome-shaped shear plate 24, preferably of spherical curvature having a radius on the order of about two inches. This shear plate 24 is provided with a plurality of apertures 28 which may vary in size and shape, depending upon re-'- quirementa'but principally such that a hair may enter and assume an erect position without allowing the skin to enter sufllciently to be abraded by the inner cutter. For example, in-an extremely thin plate, on the order of a few thousandths of an inch, the diameter or greatest width of the apertures 26' may be about .025 of an inch, and are preferably-wound, as shown, although they may be square holes, straight or curved slots radially or otherwise arranged, and the like, as illustrated in Fig.5. Apertures as much as .035 of an inch in greatest width or diameter have been found effective. Despite the extreme thinness of the plate 24, which allows a close shave to be had, the plate is very rigid, the curvature of the plate 24 causing it to resist distortion and maintain its normal dome-shape.
Positioned beneath the shear plate 24 is an inner cutter 21 which preferably consists of a relatively massive body 28 secured on the. upper end of the motor shaft 28, so as to act as a; flywheel when the motor is rotating. As best shown in Fig. 3, the outer face of the inner cutter body '28 is provided with spaced radial slots 20. Although four such slots are shown, a greater or fewer number may be provided, if so desired. The slots 30 are preferably'saw-cut or milled diametrically with outwardly-tapering bottoms. Mounted in the slots 30 of the inner cutter body are generally wedge-shaped shearing blades 34 which are best shown in Fig. 4. The blades 34 are made of relatively thin hardened steel and are each provided with a curved upper edge 38. preferably ground flat so as to have sharp edges, and conformlngto the interior curvature of the shear plate 24. The shape of the lower edge 38 of the blade is such as to provide a fulcrum point at 38', so that the blade may" tilt about that point as welias'slide up the incline at the outer end of the corresponding slot 30.
As shown' in Fig.3, the inner cutter body 28 is preferably provided with bores or recesses lll beneath and intersecting the slots 30 and in these bores 40 are light coil-J springs 42 which bear against the lower edges '38 of the blades 3| and normally urge their upper edges 36 into intimate engagement with the under surface of thesh'ear plate 24. During operation of the device, the centrifugal force of rotation of the inner cutter 21 tends to urge the blades 34 radially outwardly, and because of the curvature of the bottom of the slots 10 this centrifugal urge tends to force the blades 34 more intimately into shearing engagement with theunder surface of the shear plate 24. Thus, if desired the springs 40 may be omitted or retained merely to perform a holding function to prevent looseness or rattling when the device is not in use.
The blades 3| are maintained in spaced relationship to each other by engagement at their inner ends with a disc 44 which is removably disposed in a depression or recess 46 in the upper center of the inner cutter body 28. The
point is at the center, it is supported during material flexing, in case of abnormal shaving pressure, by the disc and thus deformation or' distortion of the shear plate is prevented. Likewise, in order; to provide support tor the remainder of the shear plate 24 during abnormal shaving pressure, radial ribs 45 may be provided on the 'inner cutter body 28 between the blades 34, the upper surfaces of these ribs being spaced only a few thousandths of an inch from the undersurface of the shear plate 24, so as to be normally disengaged therefrom.
The inner cutter body 28 is of somewhat small- ,er diameter than the internal diameter of the pletely out of the device because of the space 48 between shell I4 and the flat opposite walls oi the handle II, as shown in Fig. 4.
In operation of the shaving device shown in Figs. 1 to 4 inclusive, the motor is set into operation and rotates the inner cutter 21 with its blades 34 wiping the under surface of the shear plate.24, this wiping action being insured not 45. Also, by reason oi the flywheel actipn-gfith only by the springs 40, but also and principally by the centrifugal effect of the blades, which are cammed upwardly against the shearplate by the curved bottom slots 30 in which they rest. The flywheel effect oi the relatively massive body 28 causes the hairs projected through the shear plate aperture 26 to be cleanly and quickly severed by the impact shear action of the blades 34 coacting with the edges of the shear plate apertures 26.
Because the shear plate 24 is large in area and its apertures are substantially always uncovered by the small. area inner cutter blades, the hair shearing action is continuous so that a rapid shave may be effected. Also, by reason of its shape, a very thin shear plate may be pro-- vided to effect a close shave and if there-is' a tendency to flex, the shear plateis'i'mmediate supported by the inner cutter disc 44 and rib motor operates more smoothly and high speed is obtainable without pulling of the hairs or injury to the skin.
Figs. and 6 disclose another form of the invention, which includes a tubular shell 50 similai-"to shell l4 and attached to the upper end of the motor-containing handle 52 of the device. The shell 50 is provided with an upper threaded portion 54 which receives a ring 56 having an inwardly directed flange iitthereon. Splined for axial movement on the upper end of the motor shaft 60 is a cutter 6| consisting of. a collar 02 from which project radially two thin shearing blades 64'as shown in Fig. '7. The number of blades carried by the collar may be varied as desired. A spring 66 encircles the'motor shaft 50 and bears against a washer 68 which. engages the lower end of the collar 62 and urges it axially of the shaft. The upper edges of the shearing blades 64 of the cutter 6| bear against the under side of a dome-shaped shear plate, which is slidably mounted beneath the flange 58 on the collar 55. The center oi. the shear plate III is provided with a downwardly projecting socket 12 which receives a pin 14 mounted eccentrically on the end of the motor shaft 60.
During operation of the device shown in Figs.
"and the apertures in the shear plate.
5, 8 and 7, the motor directly drives the shearing blades 54 about the axis of the shaft I0 and the eccentric pin 14 causes the outer shear plate to gyrate within the flange 58. The spring 80; maintains the blades 84 in proper shearing relation to and at proper shaving pressure against the under surface of the outer shear plate Ill, whereby efiective shearing action may be obtained.
Fig. 8 discloses another form of gyrating shear plate and rotary inner cutter assembly, in which A an outer shear plate at, similar to the plate disclosed in Figs. 5 and 6, cooperates with a flywheel type inner cutter 8| similar to that disclosed in Figs. 3 and 4. The shear plate 80 is provided with a hearing or socket "which receives a pin .4
mounted eccentrically ina depression in the center of, the flywheel 86 for efiecting the gyratory movement of the shear plate. The flywheel 86 is provided with a plurality of substantially'wedgeshaped blades 88 which are urged by centrifugal force and by springs 90 into intimate engagement with the under surface of the shear plate. The blades 88 may be maintained in proper spaced relation by a projecting lug 85 formed on the flywheel 85 and which engages the inner edges of each blade. 1
Fig. 9 discloses another arrangement for-gyrating the shear plate. In this form of the invention, the shear plate Hill is provided with a downwardly-projecting, rotatably mounted ball II! which is received in an eccentrically-located recess H14 in the rotary shearing blade I06.
In the forms of dry shaving devices illustrated in Figs. 5 to 9, inclusive, the gyratory action of the shear plate not only effects a draw out between the rotating inner cutter blades and the shear plate apertures, but it enables the apertures in the shear plate to hunt the short hairs and thus provides a smooth shave without requiring excessive manual scrubbing movement of the shaving head. Also, the constant movement of the shear plate prevents abrasion of the same skin area. by
. cases wherethe device is held too long in ,one place with undue pressure causing the skin to be ressed into the shear plate apertures. No cuting takes place between the edge of the flange 54 In other respects the operation of the gyratory shear plate form of the invention is like the flxed shear plate form illustrated in Figs. 1 to 4 inclusive.
It will be seen that the present invention pro- 2 vides a very effective, simple-and inexpensive dry 1 shaving device, which has many advantages over those in current use. While certain preferred embodiments of the invention have been illustrated and described herein, it is to be understood that the invention is not limited thereby, but is susceptible of changes in form and detail within the scope of the appended claims.
We claim:
1. In a shaving device, the combination of a thin, apertured, convex, skin-contacting shear plate, an inner cutter having at least one shearing edge engaging the concave under surface of the shear plate, means for rotating the cutter about an axis substantially normal to the surface of the shear plate, and means responsive to rotation of said cutter for urging the shearing edge thereof transversely and longitudinally of the axis into intimate wiping contact with the concave the skin to be shaved with the axisof the cutter directed endwisetoward the skin.
25111 a shaving. device, the combination of a supporting member a thin, apertured, skin-contacting shear plate engaging said supporting member at its periphery, an inner cutter memher having at least one shearing edge engaging the under surface of said shear plate, means for rotating said cutter member about an axis substantially normal to the surface of the shear plate to wipe the shearing edge overisaid under surface of the shear plate to sever the hairs projected therethrough', a dc esse'd' portion on the cutter memberv adjacent the shearing edge thereof providing a hair-receiving cavity under g sever hairs projected through the apertures in )said shear plate said means comprising a shaft the shear plate the periphery of the cutter member being spaced from the periphery of the supporting member to provide a space for receiving severed hair.
3'. In a shaving device, the combination of a supporting member a thin, apertured, skin-contacting shear plate engaging said supporting member at its periphery, an inner cutter member having at least one shearing edge engaging the under surface of said shear plate, means for rotating said cutter member aboutan axis substantially normal to the surface of the shear plate .to wipe the shearing edge over said under surface of the shear plateto sever the hairs projected therethrough, and a radially extending depression in the cutter member adjacent the shearing edge thereof for receiving the cut hairs for ejection radially by the centrifugal force of rotation of the cutter the periphery of the cutter member being spaced from the periphery of the supporting member to provide a space for receiving severed hair.
4. In a shaving device, the combination ofathin, flexible, apertured, convex skin-contacting shear plate, an inner cutter having at least one. shearing edge engaging the under surface of said shear plate, means for rotating said cutter about an axis substantially normal to the shear plate to wipe the shearing edge over said under surface of the shear plate to sever the hairs projected and means associated with said.
cutter inaxially fixed relation with respect to and engageable with said shear plate to afford support for the latter during flexing, said cutter having substantial mass in the form of a fly and means eccentric to the shaft for gyrating the I shear plate.
6. In a shaving device, the combination of a handle, a thin, apertured, convex skin-contacting shear plate mounted on said handle, a rotatable member adjacent the concave under surface of said plate, said member having at least one substantially radial slot having a. bottom inclined axially outwardly, an axially-tapered bla'de movably mounted in said slot, and means for rotating said'member, whereby the blade is moved radially in said slot by centrifugal force and is urged against said plate by the cam action of the inclined bottom of the blade slot.
' 7. In a shaving device, the combination of a handle, a thin, apertured, skin-contacting shear plate mounted on said handle, a member adjacent the under surface of said plate and rotatable about an axis substantially normal thereto, a substantially radial guide on said member, a blade movably mounted in said guide, means for rotatingsaidjmember, and cooperating means on the blade and member responsive to the rotation 1 of the member for moving the blade in the guide transversely and longitudinally of the axis against thesaid under surface of the plate.
FREDERICK E. MOSKOVICS. VICTOR R. ABRAMS.
.DlSCLA I ME R 2,119,021.Fredefick E. Moskovics, Greeniiviich, Conn, and Victor R. Abrams,
Maplewood, N. J. SHAVING APPARATUS.
Patent dated May 31,- 1938;
U. Andrews, and Victor R. Abrams, co-inventor.
enter this'disclaimerto claim 5 insaidLetters Patent.
Hereb ficial Gazette June 11, 1940.]
- the skin to be shaved with the axisof the cutter directed endwisetoward the skin.
25111 a shaving. device, the combination of a supporting member a thin, apertured, skin-contacting shear plate engaging said supporting member at its periphery, an inner cutter memher having at least one shearing edge engaging the under surface of said shear plate, means for rotating said cutter member about an axis substantially normal to the surface of the shear plate to wipe the shearing edge overisaid under surface of the shear plate to sever the hairs projected therethrough', a dc esse'd' portion on the cutter memberv adjacent the shearing edge thereof providing a hair-receiving cavity under g sever hairs projected through the apertures in )said shear plate said means comprising a shaft the shear plate the periphery of the cutter member being spaced from the periphery of the supporting member to provide a space for receiving severed hair.
3'. In a shaving device, the combination of a supporting member a thin, apertured, skin-contacting shear plate engaging said supporting member at its periphery, an inner cutter member having at least one shearing edge engaging the under surface of said shear plate, means for rotating said cutter member aboutan axis substantially normal to the surface of the shear plate .to wipe the shearing edge over said under surface of the shear plateto sever the hairs projected therethrough, and a radially extending depression in the cutter member adjacent the shearing edge thereof for receiving the cut hairs for ejection radially by the centrifugal force of rotation of the cutter the periphery of the cutter member being spaced from the periphery of the supporting member to provide a space for receiving severed hair.
4. In a shaving device, the combination ofathin, flexible, apertured, convex skin-contacting shear plate, an inner cutter having at least one. shearing edge engaging the under surface of said shear plate, means for rotating said cutter about an axis substantially normal to the shear plate to wipe the shearing edge over said under surface of the shear plate to sever the hairs projected and means associated with said.
cutter inaxially fixed relation with respect to and engageable with said shear plate to afford support for the latter during flexing, said cutter having substantial mass in the form of a fly and means eccentric to the shaft for gyrating the I shear plate.
6. In a shaving device, the combination of a handle, a thin, apertured, convex skin-contacting shear plate mounted on said handle, a rotatable member adjacent the concave under surface of said plate, said member having at least one substantially radial slot having a. bottom inclined axially outwardly, an axially-tapered bla'de movably mounted in said slot, and means for rotating said'member, whereby the blade is moved radially in said slot by centrifugal force and is urged against said plate by the cam action of the inclined bottom of the blade slot.
' 7. In a shaving device, the combination of a handle, a thin, apertured, skin-contacting shear plate mounted on said handle, a member adjacent the under surface of said plate and rotatable about an axis substantially normal thereto, a substantially radial guide on said member, a blade movably mounted in said guide, means for rotatingsaidjmember, and cooperating means on the blade and member responsive to the rotation 1 of the member for moving the blade in the guide transversely and longitudinally of the axis against thesaid under surface of the plate.
FREDERICK E. MOSKOVICS. VICTOR R. ABRAMS.
.DlSCLA I ME R 2,119,021.Fredefick E. Moskovics, Greeniiviich, Conn, and Victor R. Abrams,
Maplewood, N. J. SHAVING APPARATUS.
Patent dated May 31,- 1938;
U. Andrews, and Victor R. Abrams, co-inventor.
enter this'disclaimerto claim 5 insaidLetters Patent.
Hereb ficial Gazette June 11, 1940.]
US185108A 1938-01-15 1938-01-15 Shaving apparatus Expired - Lifetime US2119021A (en)

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GB2321538A GB517703A (en) 1938-01-15 1938-08-05 Improvements relating to dry shaving devices

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614321A (en) * 1950-12-23 1952-10-21 Ackerman Charles Safety razor
US2618851A (en) * 1950-03-21 1952-11-25 Oscar J Sundstrand Clipper
US2677885A (en) * 1950-09-08 1954-05-11 Kenneth W Chaun Shaving apparatus
US2700215A (en) * 1950-05-23 1955-01-25 Elsky Stanley Razor
US2742694A (en) * 1950-08-02 1956-04-24 Charles G Stone Mechanical shaver
US2933809A (en) * 1957-09-23 1960-04-26 Arthur C Mcwilliams Interchangeable cutter head dry shaver
US3261091A (en) * 1963-08-20 1966-07-19 Philips Corp Shaving head having concentric cutter elements
US3522678A (en) * 1967-07-12 1970-08-04 Unirazor Ltd Grinding methods
JPS5064069A (en) * 1973-10-15 1975-05-30
JPS5070162A (en) * 1973-10-23 1975-06-11
US3889372A (en) * 1972-08-30 1975-06-17 Matsushita Electric Works Ltd Electric dry shaver blade assembly
JPS50126491U (en) * 1974-03-26 1975-10-17
US3919770A (en) * 1972-09-13 1975-11-18 Matsushita Electric Works Ltd Outer cutting blade for electric dry shaver
JPS5246967A (en) * 1975-10-09 1977-04-14 Hamasawa Kogyo:Kk Cutting edge for electric razor
US5377699A (en) * 1993-04-02 1995-01-03 Varnum; Shirley Hair abrader
US20050257376A1 (en) * 2002-07-29 2005-11-24 Koninklijke Philips Electronics N. V. Shaving apparatus
US20080016690A1 (en) * 2004-06-21 2008-01-24 Koninklijke Philips Electronics N.V. Shaving Apparatus
US20080276459A1 (en) * 2004-06-21 2008-11-13 Koninklijke Philips Electronics N.V. A Corporation Shaving Apparatus
CN110640796A (en) * 2019-09-27 2020-01-03 王小亮 Wind-driven hair and clothes hair bulb trimmer

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618851A (en) * 1950-03-21 1952-11-25 Oscar J Sundstrand Clipper
US2700215A (en) * 1950-05-23 1955-01-25 Elsky Stanley Razor
US2742694A (en) * 1950-08-02 1956-04-24 Charles G Stone Mechanical shaver
US2677885A (en) * 1950-09-08 1954-05-11 Kenneth W Chaun Shaving apparatus
US2614321A (en) * 1950-12-23 1952-10-21 Ackerman Charles Safety razor
US2933809A (en) * 1957-09-23 1960-04-26 Arthur C Mcwilliams Interchangeable cutter head dry shaver
US3261091A (en) * 1963-08-20 1966-07-19 Philips Corp Shaving head having concentric cutter elements
US3522678A (en) * 1967-07-12 1970-08-04 Unirazor Ltd Grinding methods
US3889372A (en) * 1972-08-30 1975-06-17 Matsushita Electric Works Ltd Electric dry shaver blade assembly
US3919770A (en) * 1972-09-13 1975-11-18 Matsushita Electric Works Ltd Outer cutting blade for electric dry shaver
JPS5064069A (en) * 1973-10-15 1975-05-30
JPS5070162A (en) * 1973-10-23 1975-06-11
JPS50126491U (en) * 1974-03-26 1975-10-17
JPS5246967A (en) * 1975-10-09 1977-04-14 Hamasawa Kogyo:Kk Cutting edge for electric razor
US5377699A (en) * 1993-04-02 1995-01-03 Varnum; Shirley Hair abrader
US20050257376A1 (en) * 2002-07-29 2005-11-24 Koninklijke Philips Electronics N. V. Shaving apparatus
US7698819B2 (en) * 2002-07-29 2010-04-20 Koninklijke Philips Electronics N.V. Shaving apparatus
US20080016690A1 (en) * 2004-06-21 2008-01-24 Koninklijke Philips Electronics N.V. Shaving Apparatus
US20080276459A1 (en) * 2004-06-21 2008-11-13 Koninklijke Philips Electronics N.V. A Corporation Shaving Apparatus
US8336211B2 (en) * 2004-06-21 2012-12-25 Koninklijke Philips Electronics N.V Shaving apparatus
CN110640796A (en) * 2019-09-27 2020-01-03 王小亮 Wind-driven hair and clothes hair bulb trimmer

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