US3858461A - Shaver inner cutter - Google Patents

Shaver inner cutter Download PDF

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Publication number
US3858461A
US3858461A US414175A US41417573A US3858461A US 3858461 A US3858461 A US 3858461A US 414175 A US414175 A US 414175A US 41417573 A US41417573 A US 41417573A US 3858461 A US3858461 A US 3858461A
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US
United States
Prior art keywords
strip
archlike
edge
plane
blade sections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US414175A
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English (en)
Inventor
Robert J Tolmie
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Remington Products Inc
Sperry Corp
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Sperry Rand Corp
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Filing date
Publication date
Application filed by Sperry Rand Corp filed Critical Sperry Rand Corp
Priority to US414175A priority Critical patent/US3858461A/en
Priority to CA209,863A priority patent/CA1016735A/en
Priority to AT773474A priority patent/AT333620B/de
Priority to GB4313574A priority patent/GB1451728A/en
Priority to AU74029/74A priority patent/AU482754B2/en
Priority to FR7436561A priority patent/FR2250587B1/fr
Priority to NLAANVRAGE7414423,A priority patent/NL184460C/xx
Priority to DE19742452859 priority patent/DE2452859A1/de
Priority to CH1488374A priority patent/CH578920A5/xx
Priority to US05/521,724 priority patent/US3945118A/en
Priority to JP49129485A priority patent/JPS5741266B2/ja
Publication of US3858461A publication Critical patent/US3858461A/en
Application granted granted Critical
Priority to CA255,234A priority patent/CA1016736A/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 TEACHERS INSURANCE & ANNUITE ASSOCIATION OF AMERICA,, MUTUAL TRUST LIFE INSURANCE COMPANY, C/O MIMLIC ASSET MANAGEMENT COMPANY, SUN LIFE ASSURANCE COMPANY, reassignment TEACHERS INSURANCE & ANNUITE ASSOCIATION OF AMERICA, LIEN (SEE DOCUMENT FOR DETAILS). Assignors: REMINGTON PRODUCTS, INC., A CORP OFF DE
Assigned to TEACHERS INSURANCE & ANNUITY ASSOCIATION OF AMERICA, MINISTERS LIFE - A MUTUAL LIFE INSURANCE COMPANY, MINNESOTA MUTUAL LIFE INSURANCE COMPANY OF AMERICA, THE, NORTH ATLANTIC LIFE INSURANCE COMPANY OF AMERICA, THE, AMERICAN INVESTORS LIFE INSURANCE COMPANY, MUTUAL SERVICE LIFE INSURANCE COMPANY, C/O MIMLIC ASSET MANAGEMENT COMPANY, CONNECTICUT BANK AND TRUST COMPANY, NATIONAL ASSOCIATION, AS AGENT, COMMERCIAL UNION LIFE INSURANCE COMPANY OF AMERICA, C/O COMMERICAL UNION INVESTMENT MANAGEMENT CORP. reassignment TEACHERS INSURANCE & ANNUITY ASSOCIATION OF AMERICA SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REMINGTON PRODUCTS, INC., A DE CORP.
Assigned to STATE STREET BANK AND TRUST COMPANY OF CONNECTICUT, NATIONAL ASSOCIATION reassignment STATE STREET BANK AND TRUST COMPANY OF CONNECTICUT, NATIONAL ASSOCIATION LIEN (SEE DOCUMENT FOR DETAILS). Assignors: REMINGTON PRODUCTS, INC., A DE CORPORATION
Anticipated expiration legal-status Critical
Assigned to REMINGTON PRODUCTS, INC. reassignment REMINGTON PRODUCTS, INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: STATE STREET BANK AND TRUST COMPANY OF CONNECTICUT, NATIONAL ASSOCIATION
Assigned to PROVIDENT BANK, THE reassignment PROVIDENT BANK, THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REMINGTON PRODUCTS COMPANY
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
Assigned to REMINGTON PRODUCTS COMPANY reassignment REMINGTON PRODUCTS COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: REMINGTON PRODUCTS, INC., A CORP. OF DE
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
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/60—Making other particular articles cutlery wares; garden tools or the like
    • B21D53/64—Making other particular articles cutlery wares; garden tools or the like knives; scissors; cutting blades
    • B21D53/645—Making other particular articles cutlery wares; garden tools or the like knives; scissors; cutting blades safety razor blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/60—Making other particular articles cutlery wares; garden tools or the like
    • B21D53/64—Making other particular articles cutlery wares; garden tools or the like knives; scissors; cutting blades
    • 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
    • B26B19/044—Manufacture and assembly of cutter blocks

Definitions

  • ABSTRACT A landless inner cutter having a body portion which is 1 1 Jan.7, 1975 made from a single piece of metallic material such as a strip of sheet metal.
  • the inner cutter has a body portion including a pair of longitudinal flanges provided with ledges which support a plurality of parallel, archshaped, cutter tooth blade sections. The blade sections span the space between the flanges and are disposed normal to the same.
  • the inner cutter includes a support which is also made of a single piece of sheet metal, to which the blade: sections are individually secured so as to rigidly maintain the same parallel to one another.
  • the method of forming the blade sections in a strip of sheet metal in order to form a landless inner cutter includes the steps of removing material from the strip to provide the same with a first archlike edge which has a rise and a span; cutting a second archlike edge in the strip which is longitudinally displaced from the first edge such that the span of the second edge intersects the rise of the first edge; bending the resulting arch-shaped strip material or blade section, between the archlike edges out of and normal to theplane of the strip, so as to provide a normally disposed, arch-shaped blade section and to expose another first archlike edge in the plane of the strip; and, repeating the cutting and'bending steps, as necessary, to provide a plurality of equidistantlyspaced, normally disposed, arch-slnaped blade sections in the strip.
  • Prior art inner cutters are sometimes made of lightweight sheet metal parts so as to reduce the mass of the inner cutter, which results in lessening the vibration engendered by the inner cutter as it is reciprocated relative to an outer cutter for shearing hair.
  • the various prior art methods of fabricating such lightweight inner cutters have included the steps of forming a plurality of generally C-shaped, equidistantly longitudinally spaced cuts in a strip of sheet metal material, and bending the. material within the perimeters of the respective cuts out of the plane of the strip, so as to form a plurality of parallel, upstanding tabs and thus blade sections.
  • a given blade section is separated from an adjacent blade section by a transversely-extending portion of strip material remaining in the plane of the strip, i.e., a supporting land, andby a space equivalent to the height of the blade section bent out of the plane of the strip.
  • the number of blade sections of a particular height which can be formed, in a given length of strip material depends on the width of the space occupied by the supporting lands between the various blade sections.
  • the blade sections have been more closely spaced adjacent to one another by eliminating the supporting lands between the blade sections, the prior art processes for doing so areexpensive and time consuming due to the necessity of reverting to processes which include the steps of cutting of the blade sections completely out of the strip of sheet metal, aligning them with one another and individually separately securing them to a supporting member or mount.
  • the mount has consisted of a plurality of parallel rods which are passed through openings provided in the aligned blade sections and then secured to the blade sections, for example, as by welding.
  • the mount has consisted of an elongated bar having equidistantly longitudinally-spaced, transverse cuts, within which the blade sections are individually mounted and secured in place by means of a suitable adhesive.
  • An object of this invention is to provide a novel landless inner cutter
  • Another object is to provide a method of forming blade sections in a strip of metallic material for forming an inner cutter for a shaver, without forming lands between the blade sections;
  • a further object is to provide an inexpensive process for forming closely spaced blade sections in a strip of sheet metal material for forming a landless inner cutter for a shaver;
  • a still furtherobject is to provide an improved inner cutter having a sheet metal body, including cutter tooth blade sections which are formed in a single piece of sheet metal material in a manner allowing for more closely spacing the blade sections than has heretofore been possible.
  • the body portion made from a strip of metallic material such as a piece of sheet metal.
  • the body portion includes a pair of longitudinally-extending side sections and a plurality of transversely-extending, archshaped blade sections.
  • the side sections each include a plurality of equidistantly longitudinally spaced ledges, each of which is disposed opposite to a ledge of the other side section and forms therewith a pair of ledges.
  • the side sections taken together, include a plurality of equidistantly longitudinally spaced pairs of ledges.
  • the blade sections which are each supported by a given pair of ledges, span the space between the side sections and extend normal to the same.
  • each of the blade sections has inner and outer arch-shaped edges, and the opposite extremities of each blade section in conjunction with the side sections define spaced bends in the span of the outer archshaped edge of the respective blade sections.
  • the inner cutter also includes means for securing the normally disposed blade sections parallel to one another.
  • the method of forming blade sections for the landless inner cutter includes the step of removing material from the strip so as to provide the same with a first transversely-extending archlike edge in the plane of the strip and between its side edges.
  • the first archlike edge has a rise extending longitudinally of the strip and a span extending transversely of the strip.
  • the strip is then provided with an archlike cut to form a second archlike edge in the strip which has a span that intersects the rise of the first archlike edge.
  • the first and second edges form an arch-shaped blade section in the plane of the strip which is bent out of the plane of the strip and normal to the same. In doing so, another first archlike edge is exposed in the plane of the strip, i.e., the other edge formed by the archlike cut.
  • FIG. 1 is a perspective view of a landless inner cutter for a shaver, the inner cutter including an elongated body portion having a pair of longitudinal side sections and a plurality of transverse blade sections, and includ ing a member for securing the blade sections parallel to one another;
  • FIG. 2 is a perspective view of the underside of a typical strip of sheet metal material prior to forming the blade sections in the strip so as to form the body portion of the inner cutter of FIG. 1;
  • FIG. 3 is a fragmentary cross-sectional view, in elevation, of the strip of material of FIG. 2, seated on a die beneath a lancing tool which is adaptedto cut and bend the strip material for the purpose of forming blade secshown in FIG. 3;
  • FIG. 5 is an enlarged, fragmentary plan view of the underside of the strip of material as it is shown in FIG. 3, with a dot-dashed area superimposed on the Figure for representing the area cut and bent out of the plane of the strip by the lancing tool of FIG. 3 during its first working cycle;
  • FIG. 6 is a section of the strip of material of FIG. 5, taken substantially along the line 6-6 of FIG. 5;
  • FIG. 7 is a view of the strip of material as it is shown in FIG. 5, after being cut and bent a second time, with a dot-dash area superimposed on the Figure for representing the area cut and bent out of the plane of the strip by the lancing tool of FIG. 3 during its second and subsequent working cycles;
  • FIG. 8 is a section of the strip of material of FIGS. 7 and/or 9, taken substantially along the line 88 of FIGS. 7 and/or 9;
  • FIG. 9 is a fragmentary bottom plan view of the strip of material of FIG. 7, after being repeatedly cut and bent by means of the lancing tool of FIG. 3;
  • FIG. 10 is an enlarged bottom plan view of the strip of material of FIG. 5, after being transversely severed at spaced intervals so as to provide a discrete length of strip material including a plurality blade sections;
  • FIG. 11 is a side view, in elevation, of the strip of material shown in FIG. 10;
  • FIG. 12 is a side view, in elevation, of two alternative types of blade sections which may be formed in the strip of material of FIG. 8.
  • a shaver inner cutter 10 generally includes a body portion 12 and a body supporting portion 14.
  • the body portion 12 is an elongated part of the inner cutter 10 which includes a pair of straight, longitudinally-extending side sections 16 and a plurality of arch-shaped, transverselyextending blade sections 18.
  • the side sections 16 are preferably elongated flanges having an inverted L- shaped, transverse cross-section.
  • Each of the flanges 16 has a horizontally-extending base portion 20 and a vertically-extending leg portion 22, the latter including a longitudinally-extending edge 23.
  • the base portions 20 respectively include a plurality of generally V- shaped ledges 24 located at equidistantly spaced longitudinal intervals.
  • Each of the ledges 24 extends inwardly of the body portion 12 and towards a like ledge 24 of the opposite base portion 20 so as to define with the same a transversely spaced pair of ledges 24.
  • the side sections 16, considered together, include a plurality of equidistantly longitudinally spaced pairs of I ledges 24.
  • Each pair of ledges 24 merges with and supports the extremities of a given arch-shaped blade section 18 and in conjunction with the same defines a pair of intersections in the form of spaced bends 25 in the plane of the base portions 20.
  • the blade sections 18 each have outer and inner arch-shaped peripheral edges, respectively designated 26 and 28.
  • the outer peripheral edges 26 are suitably configured for slidably cooperating with a shaver outer cutter of the foil type (not shown).
  • each of the outer peripheral edges 26 has a rise 30 and a span 32, and includes an arcuatelyshaped mid-portion 34 and a pair of straight portions 36.
  • the straight portions 36 extend parallel to one another, from the extremities of the mid-portions 34 to the ledges 24, and extend parallel to the rise 30 of the blades outer edge 26.
  • arcuate-ly-shaped midportions 34 are particularly conformed to a radius of curvature corresponding to'that of are arcuately-shaped, longitudinally-extending segment of a cylinder (not shown).
  • the outer and inner peripheral edges 26 and 28 are nonconcentric, although the inner edges 28 are substantially arcuately-shaped throughout their respective lengths.
  • each of the blade sections 18 is wider at its mid-portion, as measured along the rise 30 of the outer peripheral edge 26, than it is at its extremities, as measured along the span 32 of the outer peripheral edge 26.
  • the bends 25 at the-extremities of a given blade section 18 are disposed in the span 32 of the outer peripheral edge 26 of the given blade section 18 and support the same normal to the plane of the base portions 20.
  • the vertically-extending leg portions 22 of the side sections 16 also extend normal to the plane of the base portions 20, they do so in a direction which is opposite to that of the respective blade sections 18.
  • the body supporting portion 14 is principally provided for rigidly maintaining the otherwise relatively weakly supported blade sections 18 parallel to one another. Although the body supporting portion 14 may take other suitable forms, it is shown in FIG. 1 as an elongated strip of metallic material which is substantially U-shaped in transverse cross-section.
  • the body supporting portion 14 is disposed within the rise (not numbered) of the arch-shaped blade sections 18 and includes a pair of diverging side walls 38 joined to one another by a base wall 39.
  • the side walls 38 respectively include a plurality of equidistantly longitudinally spaced slots 40 dimensioned to receive the blade sections 18. Each of the slots 40 is aligned with a slot 40 in the opposite side wall 38 so as to define with the same a pair of aligned slots 40.
  • the adjacent pairs of slots 40 are spaced from one another a distance corresponding to the equidistant spacing between adjacent blade sections 18, so as to position the connected blade sections 18 parallel to one another.
  • the body portion 12 is fixedly secured to the body supporting portion 14, for example, as by individually welding each of the blade sections 18 to the diverging side walls 38, so as to rigidly maintain the blade section 18 parallel to one another.
  • the body supporting portion 14 is also provided with a pair of suitably longitudinally spaced depending tabs 42, one of which is shown in FIG. 1, which adapt the'body supporting portion 14, and thus the inner cutter 10, to be driven in a reciprocating path of travel by an electric shaver motor (not shown).
  • the above described body portion 12 (FIG. 1), and particularly the blade sections 18 of the same may be formed from a strip of sheet metal material 44 as shown in FIG. 2.
  • Leg portions 22 (FIG. 2) corresponding to those shown in FIG. 1 may be formed in the strip 44 (FIG. 2) as by longitudinally bending marginal portions 22 of the strip 44 out of the plane of the strip 44 and normal to the same. Since the leg portions 22 are shown extending upwardly in FIG. 2, rather than downwardly as in FIG; 1, the upper side of the strip 44 of 7 FIG. 2 corresponds to the underside of the inner cutter body portion 12 of FIG. 1, before forming the blade sections 18.
  • the method of forming blade sections 118 (FIG. 1) in the strip 44 includes the steps of cutting and bending the strip 44. This may be done, as shown in FIG. 3, by means of a tool 45 and die 46.
  • the die 46 acts as a platform upon which the strip 44 is disposed for incremental movement in the direction of its length, and has a pair of intersecting horizontally and vertically extending channels, respectively designated 47 and 48.
  • the die 46 also includes a reciprocating die insert 49 which is adapted to move into and out of the die channel 47,.at the intersection of the two channels 47 and 48, in a path of travel perpendicular to the plane of the paper. In FIG. 3, the die insert 49 is shown retracted from channel 47.
  • the tool 45 which is a suitably dimensioned reciprocating lancing tool, is adapted by well-known means to be moved into and out of the die channel 48 for repeatedly lancing the strip 44.
  • the tool 45 (FIGS. 3 and 4) has an upper, horizontally-' extending surface 50; a vertically-extending, archshaped surface 51; a vertically-extending, flat surface 52; and a lower, horizontally-extending, rearwardly slanted, cutting and bending surface 54. Due to surface 54 being slanted, surfaceSl and 52 respectively form, in conjunction with the slanted surface 54, a leading arch-shaped edge 56 and a trailing straight edge 57. As shown in FIG.
  • leading and trailing edges 56 and 57 are disposed in the plane of the slanted surface 54.
  • the leading arch-shaped edge 56 has a rise 58 and a span 59, the latter being coincident with the trailing edge 57.
  • the leading edge 56 includes an arcuately-shaped mid-portion 60 and spaced, parallel extremities 63, the latter extending parallel to the rise 58 of the leading edge 56.
  • a typical repeatable operating cycle may include, for example in the sequence set forth, the steps of incrementally advancing the strip 44 to the left, in the direction of the arrow (not numbered); moving the die insert 49 into the die channel 47; lowering the lancing tool 45 against and through the strip 44, so as to cut and bend out of the plane of the strip 44 a depending tab 64; further lowering the lancing tool 45, into the die channel 48, so as to bend the tab 64 against the die insert 49; moving the die insert 49 out of channel 47; and raising the lancing tool 45.
  • the tools leading arch-shaped edge 56 gradually forms, as is shown in FIG. 5, an archlike cut 68 and then an intersection 69 in strip 44.
  • the cut 68 and intersection 69 are respectively substantially coextensive in length with the tools archshaped, leading edge 56 (FIG. 4) and straight, trailing edge 57.
  • the strip area within the arch of the archlike cut 68 of FIG. 5, i.e., the area bounded by the cut 68 and intersection 69 is shown by means of a series of dot-dash lines and designated by the reference character A-l. As shown in FIGS.
  • a transverselyextending archlike edge 70 is gradually exposed in the plane of the strip 44, between the leg portions 22.
  • the archlike edge 70 has an arcuately-shaped mid-portion 28 and oppositely spaced, parallel side portions 74, the latter extending from the extremities of the mid-portion 28 and longitudinally of the strip 44.
  • the side portions 74 also extend parallel to the rise 30 of the archlike edge 70, the span 32 of which extends transversely of 1 the strip 44 and is substantially coincident and coextensive in length with the intersection 69.
  • the rise 30, span 32, midportion 28, and side portions 74 of the archlike edge 70 are substantially coextensive in length, respectively, with the rise 58 (FIG. 4), span 57, midportion 60 and side portions 63 of the lancing tools leading archshaped edge 56, since the lancing tools leading archshaped edge 56 forms the archlike edge 70.
  • the tab 64 includes an outer peripheral archlike edge 26, having a rise 30, span 32, mid-portion 34 and side portions 36, the lengthwise dimensions of which substantially correspond to those of the edge 70 of FIG. 5.
  • the strip 44 After initially cutting and bending the strip 44 (FIG. 5) and thus forming the first archlike edge 70 in the plane of the strip 44, the strip 44 is displaced a predetermined distance to the left as shown in FIG. 3, and thus advanced toward the lower edge of the paper as shown in FIG. 7. Thereafter, a second archlike cut 68A (FIG. 7) is gradually formed in the strip 44.-The archlike cut 68A is in all respects the same as the first archlike cut 68, but the predetermined distance through which the strip 44 is advanced is less than the length of the rise 30 of the first archlike cut 68. As a result, the aforesaid predetermined distance is less than the length of the rise 58 (FIG.
  • the strip area A-2 within the arch of the second archlike cut 68A is smaller than the area of the lancing tools slanted surface 54 (FIG. 4). Accordingly, as the second archlike cut 68A is being gradually formed, the tools slanted surface 54 (FIG. 4) gradually bends the smaller dotdashed area A-2 (FIG. 7) out of the plane of the strip 44. Further, when the tools trailing straight edge 57 bears against and bends the smaller dot-dashed area A-2 it forms a pair of spaced intersections 25 in the form of spaced bends in the plane of the strip 44, rather than the single intersection 69 of FIG.
  • the blade section 18 (FIGS. 7 and 8) is provided with an outer archlike peripheral edge 26 having a rise 30A and a span 32A; and, as shown in FIG. 7, another transversely-extending archlike edge 70A is gradually formed and exposed in the plane of the strip 44.
  • the span 32A of both of the newly formed archlike edges 26 and 70A are shown in FIG. 7 to be substantially coincident with one another and with the spaced intersections 25. Due to the strip 44 being advanced a distance which is less than the length of the rise 30 of the first archlike edge 70, the span 32A of the next adjacent or second archlike edge 26 intersects the rise 30 of the first archlike edge 70. It should be noted that although the archlike edge 26 is bent out of the strip 44, it is formed while it is in the plane of the strip 44. By the same token, although the dot-dash area A-2 of FIG. 7'is bent out of the plane of the strip 44, the first and second archlike edges, 70 and 26, form the blade section 18 in the plane of the strip 44.
  • the dot-dash area A-2 (FIG. 7) is bent out of and normal to the plane of the strip 44 along the span 32A of the second archlike edge 26.
  • the strip material remaining in the plane of the strip 44 (FIG.
  • edge portions 74, edge parts 76, and spaced intersections 25, define a pair of oppositely spaced ledges 24 in the plane of the strip 44.
  • the ledges 24 merge with the blade section 18 of FIG. 8 and support the same normal to the plane of the strip 44.
  • Subsequent blade sections 18 are formed in the strip 44 in the same manner as hereinbefore described.
  • the strip 44 is longitudinally displaced a distance of less than the length of the rise 30A of the previously formed archlike edge 70A so that the respective spans 32B of next formed archlike edges, 26 and 70B, intersect the rise 30A of the previously formed archlike edges, 26 and 70A; and, the strip 44 is cut and bent so as to provide another arch-shaped blade section 18 and a pair of spaced protrusions 25 which are in all respects the same as the previously formed blade sections 18 and protrusions 25.
  • a pair of oppositely disposed, longitudinally-extending base portions 20, respectively including a plurality of equi'distantly longitudinally spaced protrusions 25, 25 and so on to 25", are formed in the plane of the strip 44.
  • the opposed base portions 20 are respectively joined to the leg portion 22 adjacent to the same to form a pair of parallel, longitudinally-extending side sections or flanges 16, which are L-shaped in transverse cross-section.
  • the aforesaid cutting and bending steps are repeated until a sufficient number of blade sections 18" are provided to form one or more inner cutter body portions 12 as shown in FIG. 1. Since this entails removing the tab 64 of FIG. 6 and providing a discrete length of strip material having a predetermined number of blade sections 18'', for example, the 21 blade sections, 18 to 18 shown in FIG. the tab 64 of FIG. 6 may be removed at any time after it is formed, whereas the process of cutting and bending is continued until at least the aforesaid predetermined number of blade sections 18" is formed in the strip.
  • the inner cutter body portion 12 of FIG. 10 may be formed by transversely severing the strip 44 of FIG. 9 at longitudinally-spaced intervals, for example in a plane which is disposed parallel to and between the tab 64 and blade section 18 and which extends through the leg portions 22, and in a like plane disposed between the 21st sections 18 .and 22nd blade section (not shown).
  • first archlike edge may be formed in the plane of the strip 44 by removing material from the latter by wellknown means other than as by cutting and bending the strip 44 as hereinbefore described.
  • first archlike edge 70 may be formed in the strip 44 as by grinding the free end of the strip 44; in which case the tab 64 (FIG. 6) will not be formed in the strip 44.
  • the strip 44 of FIG. 9 need only be severed but once, i.e., between the blade sections 18 and 18 (not shown), to form the inner cutter body portions 12 (FIGS. 1 and 10).
  • the strip 44 is just long enough to form only a single inner cutter body portion 12 (FIG. 10), again, the strip 44 need only be severed but once, i.e., to remove the tab 64 (FIG. 6), in order to form the inner cutter body portion 12 (FIGS. 1 and 10). Still further, if both .of the foregoing events occur the strip 44 need not be transversely severed at all to form a suitable inner cutter body portion 12.
  • the blade sections 18 and 18 are aligned parallel to one another as shown in FIG. 11.
  • the blade sections 18 to 18 are normally individually fixedly secured to the body supporting portion 14 (FIG. 1), as by welding.
  • material is removed from theouter peripheral edges 26 to 26 of the respective blade sections 18 to 18 for example, as by grinding the same, so as to conform the respective edges, 26 to 26 to a desired contour, for example, that of an arcuately-shaped longitudinally extending segment of a cylinder (not shown).
  • the step of removing material from the outer peripheral edges 26 to 26 preceed the steps of connecting the body supporting portion 14 (FIG. 1) to the blade sections 18 to 18 (FIG. 11), and/or that the latter be secured parallel to one another by other well-known means during the removing step.
  • an improved light-weight, landless inner cutter including blade sections which are formed 9. from a single piece of sheet metal material; and an inexpensive process of forming the blade sections which allows for more closely spacing the blade sections than has heretofore been possible.
  • said removing step includes the step of cutting the strip so as to provide the strip with said first archlike edge and severing the strip along the span of said first archlike edge so as to remove a portion of the strip.
  • step of bending a given blade section includes the step of forming a pair of intersections in the strip which are disposed in the span of the second archlike edge of said given blade section, said intersections supporting the normally disposed given blade section at the extremities thereof.
  • each of said cutting steps includes forming archlike edges respectively having an arcuately-shaped mid-portion and parallel spaced side portions with the side portions extending from the extremities of the mid-portion and longitudinally of the strip, whereby the span of a given archlike edge in the plane of the strip extends between the extremities thereof and thus between the extremities of the spaced side portions of said given edge.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Dry Shavers And Clippers (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US414175A 1973-11-08 1973-11-08 Shaver inner cutter Expired - Lifetime US3858461A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US414175A US3858461A (en) 1973-11-08 1973-11-08 Shaver inner cutter
CA209,863A CA1016735A (en) 1973-11-08 1974-09-24 Shaver inner cutter
AT773474A AT333620B (de) 1973-11-08 1974-09-25 Innenmesser fur elektrische rasierapparate und verfahren zur herstellung derselben
GB4313574A GB1451728A (en) 1973-11-08 1974-10-04 Landless inner cutter for an electric shaver
AU74029/74A AU482754B2 (en) 1973-11-08 1974-10-04 Shaver inner cutter
FR7436561A FR2250587B1 (ja) 1973-11-08 1974-11-04
NLAANVRAGE7414423,A NL184460C (nl) 1973-11-08 1974-11-05 Binnenste snijorgaan voor een elektrisch droogscheerapparaat.
DE19742452859 DE2452859A1 (de) 1973-11-08 1974-11-05 Innenmesser fuer trockenrasiergeraete
CH1488374A CH578920A5 (ja) 1973-11-08 1974-11-07
US05/521,724 US3945118A (en) 1973-11-08 1974-11-07 Shaver inner cutter
JP49129485A JPS5741266B2 (ja) 1973-11-08 1974-11-08
CA255,234A CA1016736A (en) 1973-11-08 1976-06-18 Shaver inner cutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US414175A US3858461A (en) 1973-11-08 1973-11-08 Shaver inner cutter

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/521,724 Division US3945118A (en) 1973-11-08 1974-11-07 Shaver inner cutter

Publications (1)

Publication Number Publication Date
US3858461A true US3858461A (en) 1975-01-07

Family

ID=23640283

Family Applications (1)

Application Number Title Priority Date Filing Date
US414175A Expired - Lifetime US3858461A (en) 1973-11-08 1973-11-08 Shaver inner cutter

Country Status (9)

Country Link
US (1) US3858461A (ja)
JP (1) JPS5741266B2 (ja)
AT (1) AT333620B (ja)
CA (1) CA1016735A (ja)
CH (1) CH578920A5 (ja)
DE (1) DE2452859A1 (ja)
FR (1) FR2250587B1 (ja)
GB (1) GB1451728A (ja)
NL (1) NL184460C (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52132284U (ja) * 1976-03-30 1977-10-07
DE4223131A1 (de) * 1991-07-15 1993-01-21 Matsushita Electric Works Ltd Inneres schneidelement fuer einen trockenrasierer
EP1555093A1 (en) * 2004-01-15 2005-07-20 Izumi Products Company Method for manufacturing an inner cutter of a reciprocating electric shaver and an inner cutter of a reciprocating electric shaver
US20080016694A1 (en) * 2006-07-21 2008-01-24 Matsushita Electric Works, Ltd. Electric shaver
US20080047146A1 (en) * 2005-03-05 2008-02-28 Wolfgang Longerich Shaving System
US20090038166A1 (en) * 2004-07-23 2009-02-12 The Gillette Company Sharp undercutter and undercutter fabrication
US20100325893A1 (en) * 2007-07-12 2010-12-30 Panasonic Electric Works Co., Ltd. Inner edge of reciprocating electric shaver

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858461A (en) * 1973-11-08 1975-01-07 Sperry Rand Corp Shaver inner cutter
JPS581947B2 (ja) * 1977-03-19 1983-01-13 泉精密工業株式会社 電気かみそりの内刃製造法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1383047A (en) * 1919-04-21 1921-06-28 Boston Pencil Pointer Company Method of making cutters for pencil-sharpeners
US2223768A (en) * 1938-01-11 1940-12-03 Martin Brothers Electric Compa Method of making razor heads
US3016600A (en) * 1953-08-25 1962-01-16 Stanley Works Filing tool
US3166957A (en) * 1961-11-27 1965-01-26 Philips Corp Method of manufacturing cutting plates
US3216286A (en) * 1961-06-16 1965-11-09 Carinthia Elektrogerate Ges M Dry shavers
US3290917A (en) * 1963-07-24 1966-12-13 Stanley Works Method of producing a cutting tool

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT181527B (de) * 1953-12-17 1955-03-25 Gerhard Dipl Ing Heyek Untermesser für den Scherkopf von Trockenrasierapparaten
DE1728376A1 (de) * 1965-07-29 1971-12-30 Payer Lux Messerblock fuer Trockenrasierapparate
US3858461A (en) * 1973-11-08 1975-01-07 Sperry Rand Corp Shaver inner cutter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1383047A (en) * 1919-04-21 1921-06-28 Boston Pencil Pointer Company Method of making cutters for pencil-sharpeners
US2223768A (en) * 1938-01-11 1940-12-03 Martin Brothers Electric Compa Method of making razor heads
US3016600A (en) * 1953-08-25 1962-01-16 Stanley Works Filing tool
US3216286A (en) * 1961-06-16 1965-11-09 Carinthia Elektrogerate Ges M Dry shavers
US3166957A (en) * 1961-11-27 1965-01-26 Philips Corp Method of manufacturing cutting plates
US3290917A (en) * 1963-07-24 1966-12-13 Stanley Works Method of producing a cutting tool

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52132284U (ja) * 1976-03-30 1977-10-07
DE4223131A1 (de) * 1991-07-15 1993-01-21 Matsushita Electric Works Ltd Inneres schneidelement fuer einen trockenrasierer
US5214833A (en) * 1991-07-15 1993-06-01 Matsushita Electric Works, Ltd. Method of manufacturing an inner cutter for a dry shaver
US7243576B2 (en) 2004-01-15 2007-07-17 Izumi Products Company Method for manufacturing an inner cutter of a reciprocating electric shaver and an inner cutter of a reciprocating electric shaver
US20050155230A1 (en) * 2004-01-15 2005-07-21 Izumi Products Company Method for manufacturing an inner cutter of a reciprocating electric shaver and an inner cutter of a reciprocating electric shaver
US20070022609A1 (en) * 2004-01-15 2007-02-01 Izumi Products Company Inner cutter of a reciprocating electric shaver
EP1555093A1 (en) * 2004-01-15 2005-07-20 Izumi Products Company Method for manufacturing an inner cutter of a reciprocating electric shaver and an inner cutter of a reciprocating electric shaver
US7313867B2 (en) 2004-01-15 2008-01-01 Izumi Products Company Inner cutter of a reciprocating electric shaver
US20090038166A1 (en) * 2004-07-23 2009-02-12 The Gillette Company Sharp undercutter and undercutter fabrication
US20080047146A1 (en) * 2005-03-05 2008-02-28 Wolfgang Longerich Shaving System
US7895753B2 (en) * 2005-03-05 2011-03-01 Braun Gmbh Shaving system
US20080016694A1 (en) * 2006-07-21 2008-01-24 Matsushita Electric Works, Ltd. Electric shaver
US7996995B2 (en) * 2006-07-21 2011-08-16 Panasonic Electric Works Co., Ltd. Electric shaver
US20100325893A1 (en) * 2007-07-12 2010-12-30 Panasonic Electric Works Co., Ltd. Inner edge of reciprocating electric shaver

Also Published As

Publication number Publication date
AT333620B (de) 1976-12-10
CA1016735A (en) 1977-09-06
FR2250587B1 (ja) 1980-03-07
NL7414423A (nl) 1975-05-12
JPS5741266B2 (ja) 1982-09-02
ATA773474A (de) 1976-03-15
FR2250587A1 (ja) 1975-06-06
DE2452859C2 (ja) 1987-07-16
JPS5078464A (ja) 1975-06-26
NL184460B (nl) 1989-03-01
CH578920A5 (ja) 1976-08-31
AU7402974A (en) 1976-04-08
NL184460C (nl) 1989-08-01
DE2452859A1 (de) 1975-05-15
GB1451728A (en) 1976-10-06

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