US3810306A - Shaver cutter head - Google Patents

Shaver cutter head Download PDF

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Publication number
US3810306A
US3810306A US00322760A US32276073A US3810306A US 3810306 A US3810306 A US 3810306A US 00322760 A US00322760 A US 00322760A US 32276073 A US32276073 A US 32276073A US 3810306 A US3810306 A US 3810306A
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United States
Prior art keywords
spring
recess
cutter
walls
inner cutter
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Expired - Lifetime
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US00322760A
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English (en)
Inventor
D Locke
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Sperry Corp
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Sperry Rand Corp
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Publication date
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Priority to US00322760A priority Critical patent/US3810306A/en
Priority to GB4072373A priority patent/GB1405553A/en
Priority to AU59947/73A priority patent/AU481509B2/en
Priority to CA180,765A priority patent/CA984598A/en
Priority to AT838873A priority patent/AT325992B/de
Priority to IT31562/73A priority patent/IT1001869B/it
Priority to FR7341976A priority patent/FR2229217A5/fr
Priority to NL7400306A priority patent/NL7400306A/xx
Priority to BE139689A priority patent/BE809599A/xx
Priority to DE2402006A priority patent/DE2402006A1/de
Priority to JP49006952A priority patent/JPS49103752A/ja
Application granted granted Critical
Publication of US3810306A publication Critical patent/US3810306A/en
Assigned to MELLON BANK (EAST) NATIONAL ASSOCIATION, A NATIONAL BANKING ASSOCIATION reassignment MELLON BANK (EAST) NATIONAL ASSOCIATION, A NATIONAL BANKING ASSOCIATION LIEN (SEE DOCUMENT FOR DETAILS). Assignors: REMINGTON PRODUCTS, INC.
Assigned to SUN LIFE ASSURANCE COMPANY,, MUTUAL TRUST LIFE INSURANCE COMPANY, C/O MIMLIC ASSET MANAGEMENT COMPANY, TEACHERS INSURANCE & ANNUITE ASSOCIATION OF AMERICA, reassignment SUN LIFE ASSURANCE COMPANY, LIEN (SEE DOCUMENT FOR DETAILS). Assignors: REMINGTON PRODUCTS, INC., A CORP OFF DE
Assigned to MUTUAL SERVICE LIFE INSURANCE COMPANY, C/O MIMLIC ASSET MANAGEMENT COMPANY, CONNECTICUT BANK AND TRUST COMPANY, NATIONAL ASSOCIATION, AS AGENT, NORTH ATLANTIC LIFE INSURANCE COMPANY OF AMERICA, THE, MINISTERS LIFE - A MUTUAL LIFE INSURANCE COMPANY, AMERICAN INVESTORS LIFE INSURANCE COMPANY, MINNESOTA MUTUAL LIFE INSURANCE COMPANY OF AMERICA, THE, TEACHERS INSURANCE & ANNUITY ASSOCIATION OF AMERICA, COMMERCIAL UNION LIFE INSURANCE COMPANY OF AMERICA, C/O COMMERICAL UNION INVESTMENT MANAGEMENT CORP. reassignment MUTUAL SERVICE LIFE INSURANCE COMPANY, C/O MIMLIC ASSET MANAGEMENT COMPANY, CONNECTICUT BANK AND TRUST COMPANY, NATIONAL ASSOCIATION, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REMINGTON PRODUCTS, INC., A DE CORP.
Anticipated expiration legal-status Critical
Assigned to REMINGTON PRODUCTS, INC., A DE CORP. reassignment REMINGTON PRODUCTS, INC., A DE CORP. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: MELLON BANK, N.A.
Assigned to REMINGTON PRODUCTS, INC., A CORP. OF DE reassignment REMINGTON PRODUCTS, INC., A CORP. OF DE RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: MUTUAL TRUST LIFE INSURANCE COMPANY, SUN LIFE ASSURANCE COMPANY OF CANADA, TEACHERS INSURANCE AND ANNUITY ASSOCIATION OF AMERICA
Assigned to REMINGTONS PRODUCTS, INC., A CORP. OF DE reassignment REMINGTONS PRODUCTS, INC., A CORP. OF DE RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: TEACHER INSURANCE AND ANNUITY ASSOCIATION OF AMERICAN, AMERICAN INVESTORS LIFE INSURANCE COMPANY, COMMERCIAL UNION LIFE INSURANCE COMPANY OF AMERICA C/O COMMERICAL UNION INVESTMENT MANAGEMENT CORP., MINISTERS LIFE - A MUTUAL LIFE INSURANCE COMPANY, MINNESOTA MUTUAL LIFE INSURANCE COMPANY OF AMERICA, THE, MUTUAL SERVICE LIFE INSURANCE COMPANY, C/O MIMLIC ASSET MANA GEMENT COMPANY, NORTH ATLANTIC LIFE INSURANCE COMPANY OF AMERICA, THE
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/02—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the reciprocating-cutter type
    • B26B19/04—Cutting heads therefor; Cutters therefor; Securing equipment thereof
    • B26B19/042—Long hair cutters or older types comprising a cutting grid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32606—Pivoted
    • Y10T403/32622—Rocking or rolling contact

Definitions

  • An improved inner cutter for a shaver of the type which includes a cutter head having an outer cutter, an inner cutter, and a spring having opposite end portions which are adapted to be detachably connected to the inner cutter for reciprocating the inner cutter within the outer cutter.
  • the spring is adapted to be urged from a relaxed state to a compressed state.
  • the inner and outer cutters each include a hair shearing edge, the hair shearing edge of the inner cutter being urged, by means of the compressed spring, to cooperate with the hair shearing edge of the outer cutter for shearing hair as the inner cutter is reciprocated within the outer cutter.
  • a wall of the improved inner cutter is provided with spaced apertures, each of which is dimensioned to loosely receive therein one of the end portions of the spring.
  • a surface of the inner cutter wall is provided with a recess having convergent walls. The recess is dimensioned to wedge one of the spring end portions within the recess when the spring is in its compressed state. The spring is thus firmly connected to the inner cutter when reciprocating the inner cutter within the outer cutter.
  • the invention is concerned with an inner cutter of the aforesaid type which is adapted to loosely carry said spring when the spring is in its relaxed state, and which includes a surface provided with a recess having a wall configuration adapted for wedging said end of the spring within the recess when the spring is in its compressed state.
  • the invention is generally adaptable to shavers of the type which include one or more outer cutters and a corresponding number of inner cutters, wherein each of the cutters is provided with a hair shearing edge and the inner cutters are mounted for reciprocation within the outer cutters for shearing hair.
  • a typical cutter head of the aforesaid type includes one or more hollow, elongated, outer cutters, which are rectangular in transverse cross-section, and a corresponding number of elongated inner cutters mounted for reciprocation within the outer cutters.
  • Each of the outer cutters includes an upper wall, depending skirt walls and a base spacer.
  • the upper walls are each provided with plural hair reception slots which form a plurality of parallel hair shearing teeth, having hair shearing edges, in the upper wall.
  • Each of the inner cutters includes an upper wall, depending side walls and a lower wall.
  • the upper walls of the respective inner cutters are provided with hair shearing teeth forming hair shearing edges therein.
  • the hair shearing edges of the inner cutter are disposed tocooperate with the hair shearing edges of the outer cutter for shearing hairs which enter the hair reception slots, as the inner cutter is reciprocated within the outer cutter.
  • the inner cutters are reciprocated within the respective outer cutters by means of a that spring having opposite end portions and a mid-portion, the opposite end portions of each spring being connected to an inner cutter and the midportion being driven by a motor mounted within the shaver. 7
  • a typical cutter head as hereinbefore described is disclosed in US. Pat. No. 2,793,430 issued to Carissimi, Jan. 26, 1955.
  • a flat spring having an end portions rigidly connected to the inner cutter, is provided for driving each of the inner cutters.
  • the springs each include a partial loop formed therein, midway between the end portions of the spring, to engage a motor arm oscillated by the motor of the shaver.
  • the motor arms, and thus the springs and inner cutters are reciprocated by the motor several hundred times per minute.
  • the inner cutters are preferably constructed to allow for loosely connecting a randomly chosen spring thereto.
  • a loose connection between an inner cutter and spring allows for movement between the spring and inner cutter when the shaver is operated. Since such movement causes noise to be emitted by the cutter head, and causes the inner cutters, springs, and other parts of the cutter head, to wear too rapidly, it is preferred that the inner cutter and spring be firmly connected to one another .when the shaver is operated.
  • an object of this invention is to provide an improved inner cutter for a cutter head of an electric shaver.
  • Another object is to provide an inner cutter including means for loosely connecting a spring thereto when the spring is in its relaxed state, and means for firmly connecting the spring thereto when the spring is in its compressed state.
  • another object is to provide an improved cutter head including an inner cutter for an electric shaver, wherein the inner cutter is adapted to have a spring loosely connected thereto when the spring is in its relaxed state, and wherein the inner cutter is provided with means for wedging an end of the spring thereagainst when the spring is in its compressed state.
  • the invention resides in providing an improved inner cutter for a shaver of the type which includes a spring, having opposite end portions which are detachably connectable to the inner cutter.
  • the shaver includes an outer cutter within which the inner cutter is normally mounted for reciprocation and wherein the inner cutter is reciprocated by means of the spring.
  • the outer cutter includes a hair shearing edge
  • the inner cutter includes a hair shearing edge which is urged, due to the spring being urged from a relaxed state to a compressed state, to cooperate with the hair shearing edge of the outer cutter for shearing hair as the inner cutter is reciprocated within the outer cutter.
  • the improved inner cutter includes an aperture which is dimensioned to loosely receive therein one of the end portions of the relaxed spring, when connecting the inner cutter and spring, and a recess having a wall configuration adapted to wedge the spring end portion within the re cess when the spring is-in its compressed state.
  • the relaxed spring is thus loosely connectable to the inner cutter, but when compressed, is firmly connected to the inner cutter, but when compressed, is firmly connected to the inner cutter for reciprocating the inner cutter within the outer cutter.
  • FIG. 4 is a partial cross-sectional view, in elevation, of the lower wall of an inner cutter, showing a relaxed spring connected to the lower wall;
  • FIG. 5 is a partial cross-sectional view, in elevation, of an inner cutter and spring mounted within an outer cutter to form an assembled cutter head.
  • FIG. 6 is a partial cross-sectional view, in elevation, of the lower wall of an inner cutter, showing a compressed spring connected to the lower wall;
  • FIG. 7 is an exploded, partial, perspective view of an inner cutter and spring, showing the lower wall of an inner cutter in accordance with the invention
  • FIG. 8 is a partial bottom plan view of the lower wall of the inner cutter of FIG. 7;
  • FIG. 9 is a cross-sectional view, in elevation, of the inner cutter of FIG. 8, taken substantially along the line 9-9 of FIG. 8;
  • FIG. 10 is a cross-sectional view, in elevation, of the inner cutter of FIG. 8, taken substantially along the line 1010 of FIG. 8;
  • FIG. 11 is a cross-sectional end view of the inner cutter and spring of FIG. 7, taken substantially along the line 1l-11 of FIG. 7;
  • FIG. 12 is a partial cross-sectional view in elevation of the inner cutter and spring of FIG. 7, connected in accordance with the invention.
  • FIG. 13 is an exploded perspective view of the upper end of another type of electric shaver, including a cutter head having an inner cutter which may be modified to include the invention, the inner cutter being shown removed from the cutter head; and
  • FIG. 14 is an enlarged, exploded, perspective view of a type of inner cutter, and spring therefor, adapted to be included in the cutter head of FIG. 13, wherein the inner cutter is constructed in accordance with the invention.
  • an upper end of an electric dry shaver 10 (FIG. 1), of the type in which the invention may be included, generally includes an upper portion of a casing 11.
  • the casing 11 includes spaced front and rear walls, respectively numbered 12 and 13, and spaced side walls 14.
  • the walls 12, 13 and 14 define a rectangularly-shaped receptacle 15 within which a cutter head 16 is located.
  • the cutter head 16 includes a plurality of hollow, elongated, stationary, outer cutters 17, which are rectangular in transverse cross-section.
  • Each of the outer cutters 17 has an upper wall 18, spaced depending skirt walls 19, and an elongated base spacer 20 having a U- shaped appearance in transverse cross-section.
  • the outer cutters 17 each have hair shearing means including two rows of a plurality of spaced, parallel, transversely extending, hair shearing teeth 21 formed by two rows of hair reception slots 22 spaced from one another by a substantially U-shaped channel 23 in the upper wall portion 18 of the outer cutter 17.
  • the hair shearing teeth 21 respectively include opposed hair shearing edges 24.
  • Each of the base spacers 20 has opposed ends 25 and a rectangularly-shaped aperture 26 formed therein.
  • the apertures 26 are located approximately midway between the opposed ends 25 of the respective base spacers 20.
  • the base spacers 20 are positioned between the lower ends of the skirt portions 19 of the respective outer cutters l7, and fixedly connected to the skirt portions 19 by means well-known in the art, for example, as by welding.
  • the outer cutters 17 are mounted alongside and parallel to one another on a cutter head mounting frame 28.
  • the frame 28 includes an elongated, rectangular, base plate 29 having a plurality of spaced, parallel, apertures 30 formed therein, and a plurality depending leg portions 31.
  • the outer cutter base spacer apertures 26 are respectively aligned in registry with one of the frames base plate apertures 30, and the base spacers 20 are fixedly connected to the base plate 29 of the frame 28, by means well-known in the art.
  • the base plate 29 may be provided with tabs 32, which are folded over the ends 25 of the outer cutter base spacers 20.
  • the leg portions 31 may be removably fastened, by well-known means (not shown), to a motor housing 33 within the casing 11.
  • the cutter head 16 also includes a plurality of hollow, elongated, movable inner cutters 35 (FIGS. 1 and 2), which are rectangular in transverse cross-section.
  • the cutter head 16 may include a plurality of inner cutters 35 having a substantially U-shaped appearance in transverse crosssection.
  • each of the inner cutters 35 (FIGS. 2 and 3) has an upper wall 36 spaced depending side walls 37, and an elongated lower wall 38.
  • the inner cutters 35 each have hair shearing means including two rows of a plurality of spaced, parallel, transversely oriented, hair shearing teeth 39, formed by two rows ofslots 40 separated from one another by a U- shaped channel 41.
  • the hair shearing teeth 39 respectively include opposed hair shearing edges 42.
  • the inner cutter lower walls 38 are elongated, flat, substantially rectangularlyshaped portions of the inner cutter 35.
  • the lower walls 38 respectively have opposed ends 47 and opposed inner and outer surfaces, respectively designated 48 and 49.
  • Each of the lower walls 38 has a substantially rectangularly-shaped aperture 51 formed therein. The apertures 51 are located approximately midway between the opposed ends 47 of the respective lower walls 38.
  • each of the lower walls 38 includes a keyhole-shaped aperture 52, located near one of the ends 47 of the wall 38.
  • the keyhole-shaped aperture 52 includes a wide portion 54 and a narrow portion 55, the narrow portion 55 communicating with the wide portion 54.
  • Each of the lower walls 38 also includes a substantially rectangularly-shaped aperture 56, located near the other end 47 of wall 38. Apertures 52 and 56 are spaced apart from one another and located on either side of aperture 51.
  • Each of the inner cutters 35 is reciprocated within one of the outer cutters 17 (FIG. 1), by means of a spring 57.
  • the springs 57 are respectively driven by a motor arm 58 (FIGS. 1 and 5) of a shaver motor (not shown) mounted within the shaver motor housing 33.
  • each of the springs 57 is a flat spring made of, for example, a flat strip of metal, metallic material of alloy.
  • Each of the springs 57 is rectangularly-shaped in transverse cross-section, and has a body portion 60 and spaced end portions 61.
  • the body portions 60 are'each provided with a partial loop 62, formed therein approximately midway between the spring end portions 61.
  • Each of the body portions 60 has opposed upper and lower surfaces, respectively designated 63 and 64.
  • the respective end portions 61 extend upwardly of, and approximately perpendicular to, the upper surfaces 63.
  • One of the end portions 61 of each spring 57 is reduced in width and bent, to form a bent tang 65 and spaced shoulders 66.
  • the opposite end portion 61 is reduced in width and notched, to form a T-shaped head 67 having opposed notches 68.
  • the notches 68 each include opposed upper edges 69 and opposed lower edges 70.
  • the spring end portions 61 act as legs for connecting the springs 57 to the inner cutters 35 (FIGS. 2 and 3).
  • apertures 56 and 52 are respectively dimensioned to loosely receive and contain a springs tang 67 and T-shaped head 67.
  • a given spring 57 is connected to an inner cutters lower wall 38 by first inserting the tang 65 into the rectangular-shaped aperture 56. The spring 57 is then bowed, thereby moving the loop 62 (FIGS. 2 and 3) away from the lower wall 38, to move the T-shaped head 67 slightly towards the tang 65.
  • the T-shaped head 67 is then inserted into the keyhole apertures wide portion 54, as shown in dot-dash lines in FIG. 4. Upon releasing the spring 57, the T-shaped head 67 moves into the keyhole apertures narrow portion 55, as indicated by the arrow 71 in FIG. 4.
  • the spring 57 When the spring 57 is thus received within apertures 56 and 52, the spring 57 is in its relaxed state and is loosely, rather than rigidly, connected to the inner cutter 35.
  • the spring end portions 61 extend through the apertures 56 and 52 and loosely rest on the lower wall 38.
  • the spring 57 is normally loosely carried by the inner cutter 35 beneath the lower wall surface 49.
  • the bent end of the springs tang 65 overhangs the inner surface 48 of wall 38 to rest on an adjacent area of the inner surface 48.
  • the Springs shoulders 66 one of which is shown in FIG. 4, are spaced apart from the outer surface 49.
  • the springs T-shaped head 67 overhangs the inner surface 49 of the wall 38, to rest the springs upper notchedges 69, one of which is shown in FIG. 4, on adjacent areas of the inner surface 48; and the T-shaped heads lower notch edges 70 are spaced apart from the outer surface 49.
  • T-shaped heads lower notch edges 70 slidably moving against the lower walls outer surface 49, as the spring 57 is reciprocated.
  • this invention is directed to providing an inner cutter 35 including the aforesaid feature or dimensioning the aperture 56 to loosely contain an end portion of the spring 57, in combination with means for firmly connecting the-spring 57 and inner cutter 35 when the spring 57 is urged from its relaxed state to a compressed state. Normally this occurs when the inner cutter 35 and connected spring 57 are mounted within the outer cutter 17 for reciprocation therein, since the spring 57 is then urged toward the inner cutter 35 by means of the shaver motor arm 58.
  • the aforesaid relative movement between the tang 65 and inner cutter 35, as the shaver is operated is substantially if not completely prevented.
  • the recess 75 (FIG. 7) has a mid-portion 76 which communicates with the rectangularly-shaped aperture 56, and has a rectangularly-shaped entry opening 77.
  • the aperture 56 thus has an entry opening 77 which is elongated and set back within the wall 38 to form the recess 75.
  • the recess 75 thus extends across aperture 56, transversely of centerline 50 and from the outer surface 49 towards the inner surface 48.
  • the recess 75 has relatively convergent longitudinally extending, side walls, 80 and 81, opposed end walls 82 and a base wall 83.
  • Side wall 80 the recess wall located closest to the adjacent end 47 of lower wall 38, merges with one of the longitudinally extending side walls of the rectangularly-shaped aperture 56, and side wall 81, the recess wall farthest from the adjacent end 47, merges with the opposite longitudinally extending side wall of aperture 56.
  • recess walls 80 and 81 lie in opposed inclined planes forming acute angles a and 1; relative to the outer surface 49. Although acute angle a, the acute angle between the plane of recess wall 80 and surface 49, is smaller than acute angle b, the acute angle between the plane of recess wall 81 and surface 49, this feature is not essential to the invention.
  • the recess side walls, 80 and 81 approach one another more closely with increasing recess depth as measured from the recess entry opening 77.
  • the recess 75 has a wedgeshaped wall configuration in transverse cross-section.
  • the lower wall aperture 56 and communicating recess 75 are dimensioned to loosely receive and contain therein the tang end portion 61 of one of the relaxed springs 57.
  • the tang 65 is inserted through the recess entry opening 77 and into aperture 56.
  • the spring 57 is thereafter connected to inner cutter 35 as previously described in connection with FIG. 4.
  • the spring 57 is bowed to insert the T- shaped head 67 into the keyhole apertures wide portion 54, and released after insertion to allow the T- shaped head 67 to move into the keyhole apertures narrow portion 55.
  • the spring 57 When the spring 57 is in its relaxed state, the spring 57 is loosely carried by the inner cutter 35 beneath the inner cutters lower wall 38 as previously described in connection with FIG. 4.
  • the aperture 56 is dimensioned to permit the tang 65 to freely contact the opposed side walls of aperture 56 when the spring 57 is in its relaxed state.
  • inner cutter 35 and spring 57 as described in connection with FIGS. 712, are mounted within an outer cutter 17, as shown in FIG. 5, and the spring 57 is compressed towards the lower wall 38 for reciprocation by the shaver motor arm 58, the springs tang 65 is inserted further inwardly of the recess 75.
  • the tang 65 and the walls of aperture 56 cooperate with one another to align the spring shoulders 66, one of which is shown in FIG.
  • the shoulders 66 thus contact the recess side walls, 80 and 81, rather than the cutters outer surface 49 as shown in FIG. 6, and shoulder 66 are thus disposed within the inner cutter wall 38, rather than externally thereof. Also, as shown in FIG. 12, the shoulders 66 hold the tang 65 out of contact with the opposed side walls of aperture 56, and the shoulders 66 extend astride aperture 56. As previously described in connection with FIG. 6, the T-shaped heads lower notch edges 70 bear against the outer surface 49, when the spring 57 is in its compressed state.
  • aperture 56 Although the dimensions of aperture 56 are larger than the corresponding dimensions of the tang 65, the tang 65 no longer contacts the opposed longitudinally extending side walls of the aperture 56 as the spring 57 is reciprocated. As shown in FIG. 12, reciprocating motion of the spring shoulders 66, rather than the tang 65, drives the inner cutter 35. Concurrently, the T-shaped head 67 (FIGS. 6 and 7) slidably moves within keyhole aperture 52, the T-shaped head's lower notch edges 70 slidably moving against outer surface 49 as the spring 57 is reciprocated. As a consequence of the lack of relative movement between the springs shoulders 66 and the inner cutter wall 38 when the spring 57 is reciprocated, the inner cutter 35 and spring 57 no longer emit noise as the inner cutter 35 is reciprocated within the outer cutter 17.
  • acute angle 12 is preferably formed at an angle in the range of from to For example, in the embodiment shown in FIGS. 7l2 angle a is about 60 and angle 12 is about 75.
  • the shaver generally includes a shaver motor (not shown) adapted to oscillate a shaver motor arm 58, and includes an upper portion of a casing 91.
  • the casing 91 includes spaced front and rear walls, respectively designated 92 and 93, and spaced side walls 94.
  • the walls 92, 93 and 94 support a removably mountable cutter head 95 thereon.
  • the cutter head 95 includes a hollow, rectangularshaped, cutter head body 96, having spaced front and rear walls, respectively designated 97 and 98, and spaced side walls 99.
  • the cutter head 95 also includes a curved stationary outer cutter 100 made of, for example, a thin rectangularly-shaped foil of metal, or of metallic or alloy material.
  • the outer cutter 100 has spaced longitudinally extending side portions 101 and opposed arcuately extending end edges 102, one of each of which is partially shown in FIG. 13.
  • the outer cutter 100 has an inner surface 103 and an outer surface 104 and has plurality spaced apertures 105 formed therein.
  • the apertures 105 provide the inner surface 103 with hair shearing means including a plurality of hair shearing edges 106.
  • the outer cutter 90 is connected to the cutter head body 96 by means well-known in the art.
  • an elongated connecting plate 107 may be provided to cooperate with protrusions 108 extending inwardly from the body 96 of the cutter head 95, to fixedly retain the outer cutter 100, by means of the side portions 101 thereof, in place on the cutter head body 96.
  • the cutter head 95 also includes a hollow, elongated, movable inner cutter 110 (FIGS. 13 and 14), having a substantially convex semi circuIar appearance in transverse cross-section.
  • the inner cutter 110 which may be made of, for example, a thin rectangularly shaped foil of metal, or of metallic or alloy material, has a semi-circularly curved upper wall 112 and a flat lower wall 38.
  • the upper wall 112 (FIG. 14) has hair shearing means including a plurality of spaced, parallel, transversely extending, hair shearing teeth 114, formed therein by a plurality of spaced parallel slots 115.
  • the hair shearing teeth 114 respectively include opposed hair shearing edges 116.
  • the parts of the inner cutter lower wall 38 of FIG. 14 bear the same numerical designations as the corresponding parts of the inner cutter wall 38 of FIGS. 2 and 3, and the lower wall 38 of FIG. 14 includes the recess 75 described in connection with FIGS. 7-12.
  • the spring 57 of FIG. 14 is in all respects the same as the spring 57 shown in FIGS. 2 and 3, and is connected to the lower wall 38 as previously described in connection with FIGS. 712.
  • the inner cutter 110 of FIG. 14 has a spring 57 connected thereto as hereinbefore described in connection with FIGS. 2 and 3, and the inner cutter 110 is mounted by well-known means within the outer cutter 100 of FIG. 13.
  • the cutter head body 96, and thus the cutter head 95, is connected to the shaver casing 91 by, for example, cam means (not shown), within the cutter head body 96, adapted to cooperate with a latch 125 resiliently connected to the shaver casing 11.
  • the shaver motor arm 58 then engages the spring loop 62 to compress the spring 57 towards the inner cutters lower wall 38, thus urging spring 57 from its relaxed state to its compressed state. Compression of the spring urges the inner cutter 110 toward the outer cutter 100 to urge the respective hair shearing edges 116 and 106 to cooperate with one another for shearing hair when the inner cutter 110 is reciprocated within the outer cutter 100.
  • an improved inner cutter for a cutter head of an electric dry shaver In a cutter head including an outer cutter and an inner cutter adapted to be reciprocated within the outer cutter by means of a spring, the inner cutter is provided with means for loosely connecting the spring thereto when the spring is in its relaxed state and means for firmly connecting the spring thereto when the spring is in its compressed state.
  • thecompressed spring is firmly connected to the inner cutter to reciprocate the inner cutter within the outer cutter.
  • An improved inner cutter for a shaver of the type which includes an outer cutter and a spring, the cutters each including a first wall having a hair shearing edge and the inner cutter including a second wall, the spring being adapted to be urged from a relaxed state to a compressed state and having opposed end portions, said end portions adapted to be detachably connected to the second wall of the inner cutter, and wherein the connected spring in its compressed state normally urges the hair shearing edge of the inner cutter to cooperate with the hair shearing edge of the outer cutter for shearing hair as the inner cutter is reciprocated within the outer cutter by means of the spring, the improved inner cutter comprising:
  • said second wall has inner and outer surfaces, said aperture being dimensioned to permit a first part of said one spring end portion to be received through said second wall from the outer surface thereof and contact the inner surface when the spring is in its relaxed state, and said recess being dimensioned to seat a second part of said spring end portion within said recess and hold said first spring part out of contact withsaid inner surface when the spring is in its compressed state.
  • said aperture has an entry opening which is elongated and set back within said second wall to form said recess in communication with said aperture, said opposed recess walls extending longitudinally of the length of said recess, and one of said opposed recess walls being inclined towards the other of said opposed recess walls.
  • said opposed recess walls are elongated converging side walls, said recess including an elongated base wall and opposed end walls, said base and end walls merging with said converging side walls, and said aperture merging with said side and base walls approximately midway of the longitudinal length thereof.
  • said one spring end portion includes a tang extending from between spaced shoulders, and wherein said recess communicates with said aperture and extends thereacross, said tang extending into the aperture and overhanging a portion of the second wall, and said spring shoulders extending into the recess and alternately exerting driving forces on the opposed recess walls as the spring is reciprocated.
  • a shaver cutter head comprising:
  • a stationary outer cutter including a first wall having a hair shearing edge
  • an inner cutter removably mounted for reciprocation within the outer cutter and including first and second walls with the first wall having a hair shearing edge and the second wall having an aperture and a recess formed therein,
  • a spring having opposed end portions detachably connected to the second wall of the inner cutter and the spring adapted to be urged from a relaxed state to a compressed state
  • the aperture in the second wall of the inner cutter including opposed walls, said aperture being dimensioned to loosely contain one of said connected spring end portions and to permit said one spring end portion to freely contact said aperture walls when the spring is in its relaxed state, the recess in the second wall including opposed walls dimensioned to wedge said one spring end portion within said recess and hold said one spring end portion out of contact with said aperture walls when the spring is in its compressed state, and the spring under compression urging the inner cutter hair shearing edge to cooperate with the outer cutter hair shearing edge for shearing hair as the inner cutter is reciprocated within the outer cutter by means of the spring.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
US00322760A 1973-01-11 1973-01-11 Shaver cutter head Expired - Lifetime US3810306A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US00322760A US3810306A (en) 1973-01-11 1973-01-11 Shaver cutter head
GB4072373A GB1405553A (en) 1973-01-11 1973-08-29 Shaver cutter head
AU59947/73A AU481509B2 (en) 1973-01-11 1973-09-03 Shaver cutter head
CA180,765A CA984598A (en) 1973-01-11 1973-09-11 Shaver cutter head
AT838873A AT325992B (de) 1973-01-11 1973-10-01 Innenmesser für rasierapparate
IT31562/73A IT1001869B (it) 1973-01-11 1973-11-21 Testa di taglio per un rasoio elettrico
FR7341976A FR2229217A5 (xx) 1973-01-11 1973-11-26
NL7400306A NL7400306A (xx) 1973-01-11 1974-01-09
BE139689A BE809599A (fr) 1973-01-11 1974-01-10 Tete de coupe pour rasoir
DE2402006A DE2402006A1 (de) 1973-01-11 1974-01-11 Scherkopf fuer trockenrasiergeraete
JP49006952A JPS49103752A (xx) 1973-01-11 1974-01-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00322760A US3810306A (en) 1973-01-11 1973-01-11 Shaver cutter head

Publications (1)

Publication Number Publication Date
US3810306A true US3810306A (en) 1974-05-14

Family

ID=23256287

Family Applications (1)

Application Number Title Priority Date Filing Date
US00322760A Expired - Lifetime US3810306A (en) 1973-01-11 1973-01-11 Shaver cutter head

Country Status (10)

Country Link
US (1) US3810306A (xx)
JP (1) JPS49103752A (xx)
AT (1) AT325992B (xx)
BE (1) BE809599A (xx)
CA (1) CA984598A (xx)
DE (1) DE2402006A1 (xx)
FR (1) FR2229217A5 (xx)
GB (1) GB1405553A (xx)
IT (1) IT1001869B (xx)
NL (1) NL7400306A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003131A (en) * 1974-04-05 1977-01-18 U.S. Philips Corporation Dry-shaving apparatus with reciprocatable cutting block
US5131148A (en) * 1990-11-23 1992-07-21 Wahl Clipper Corporation Electric shaver with flexible cutter holder
US20070245565A1 (en) * 2006-04-25 2007-10-25 Matsushita Electric Works, Ltd. Inner cutter of electric shaver and reciprocating electric shaver

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL181181C (nl) * 1980-03-15 1987-07-01 Matsushita Electric Works Ltd Scheerbladsamenstel voor een elektrisch scheerapparaat van het vibratietype.
DE4303426C2 (de) * 1992-02-07 2000-05-31 Remington Corp Elektrisches Trockenrasiergerät
AT401150B (de) * 1993-10-21 1996-06-25 Philips Electronics Nv Gerät zum schneiden von haaren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2793430A (en) * 1955-01-26 1957-05-28 Sperry Rand Corp Dry shaver cutter heads
US3067511A (en) * 1960-03-23 1962-12-11 Wahl Clipper Corp Drive connection for a shaver blade
US3191300A (en) * 1963-01-14 1965-06-29 Sperry Rand Corp Guide means for inner cutter of a dry shaver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2793430A (en) * 1955-01-26 1957-05-28 Sperry Rand Corp Dry shaver cutter heads
US3067511A (en) * 1960-03-23 1962-12-11 Wahl Clipper Corp Drive connection for a shaver blade
US3191300A (en) * 1963-01-14 1965-06-29 Sperry Rand Corp Guide means for inner cutter of a dry shaver

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003131A (en) * 1974-04-05 1977-01-18 U.S. Philips Corporation Dry-shaving apparatus with reciprocatable cutting block
US5131148A (en) * 1990-11-23 1992-07-21 Wahl Clipper Corporation Electric shaver with flexible cutter holder
US20070245565A1 (en) * 2006-04-25 2007-10-25 Matsushita Electric Works, Ltd. Inner cutter of electric shaver and reciprocating electric shaver
US8146253B2 (en) * 2006-04-25 2012-04-03 Panasonic Corporation Inner cutter of electric shaver and reciprocating electric shaver

Also Published As

Publication number Publication date
JPS49103752A (xx) 1974-10-01
DE2402006A1 (de) 1974-07-18
BE809599A (fr) 1974-05-02
GB1405553A (en) 1975-09-10
AT325992B (de) 1975-11-25
ATA838873A (de) 1975-01-15
FR2229217A5 (xx) 1974-12-06
IT1001869B (it) 1976-04-30
NL7400306A (xx) 1974-07-15
CA984598A (en) 1976-03-02
AU5994773A (en) 1975-03-06

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