US3274686A - Laminated razor blade for injector razor - Google Patents

Laminated razor blade for injector razor Download PDF

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Publication number
US3274686A
US3274686A US436438A US43643865A US3274686A US 3274686 A US3274686 A US 3274686A US 436438 A US436438 A US 436438A US 43643865 A US43643865 A US 43643865A US 3274686 A US3274686 A US 3274686A
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US
United States
Prior art keywords
blade
razor
edge
reinforcing strip
injector
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
US436438A
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English (en)
Inventor
Dawidowicz Jan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eversharp Inc
Original Assignee
Eversharp Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eversharp Inc filed Critical Eversharp Inc
Priority to US436438A priority Critical patent/US3274686A/en
Priority to SE1906/66A priority patent/SE314610B/xx
Priority to GB7500/66A priority patent/GB1065933A/en
Priority to DEE31111A priority patent/DE1286430B/de
Priority to NL6602712A priority patent/NL6602712A/xx
Application granted granted Critical
Publication of US3274686A publication Critical patent/US3274686A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B21/00—Razors of the open or knife type; Safety razors or other shaving implements of the planing type; Hair-trimming devices involving a razor-blade; Equipment therefor
    • B26B21/54—Razor-blades

Definitions

  • Safety injector razors are constructed with spring biased compression means for holding a single-edge razor blade in the razor head with the cutting edge of the blade extending out from a guard bar in its safety cutting position. These razors are designed to receive a single-edge blade as it is injected laterally into the head from an injector device that holds a surplus of the razor blades.
  • the injector razor is specifically designed so that upon insertion of the blade into the razor head the leading end edge of the blade will come into abutting contact with the end edge of the used blade already positioned in the razor and will push the used blade out of one side of the razor head while the new blade is being inserted.
  • my invention is for use in combination with a safety injector razor having spring compression means for holding a razor blade in a safety cutting position, in which a new razor blade is loaded into the razor head in the safety cutting position relative to safety guard by laterally forcing the blade into the head and 3,274,686 Patented Sept. 27, 1966 abutting one end edge of the new blade against a corresponding end edge of a used blade positioned within the head, and laterally pushing the used blade out of one side of the razor head while forcing the new blade into the other side.
  • the improvement comprises a thin flat metal blade with a cutting edge formed along one elongated edge of the blade, and a thin flat reinforcing strip attached to at least one elongated edge of the blade with their respective broad faces in faceto-face adhesive bond to define a composite blade having a substantially flat and uniform thickness with the end edge of the blade and reinforcing strip defining with their combined thickness an edge surface area sufiicient for abutting contact with a corresponding edge surface area on the end edge of a similar blade.
  • One side edge of the reinforcing strip extends parallel to but is spaced from the cutting edge so that the cutting edge extends from the side edge of the reinforcing strip an extent sufiicient to extend the cutting edge out of the head of the razor in safety cutting position relative to the safety guard on the razor head.
  • the invention also relates to the laminated razor blade per se with a reinforcing strip attached to either one or both broad surfaces of the blade.
  • a method of forming the single-edge laminated injector razor blade from standard double-edge razor blades is also presented.
  • This method consists of successively positioning double-edge razor blades at a first station and positioning a thin flat reinforcing strip against at least one of the fiat surfaces of the blade at the first station with their respective faces in face-to-face contact with an adhesive bond therebetween.
  • the blade and strip are then successively fed to a sealing station at which the blade and strip are adhesively bonded together as positioned to define a composite blade having a combined substantially flat and uniform thickness.
  • the laminated blade and strip are then separated to form two identical singleedge laminated injector razor blades.
  • the reinforcing strip can be applied to one or both surfaces of the blade.
  • FIG. 1 is a step-wise illustration of the method of forming the laminated single-edge razor blades from doubleedge blades;
  • FIG. 2 is a side view of single-edge laminated injector razor blade
  • FIG. 3 is a section of the single-edge laminated injector razor blade taken along lines 33 of FIG. 2;
  • FIG. 4 is a section of a second embodiment of a singleedge laminated razor blade having only one reinforcing strip laminated thereto;
  • FIG. 5 is a section of a safety injector razor head with a laminated razor blade positioned therein in its safety cutting position.
  • a continuous thin fiat reinforcing strip 10 of aluminum of a thickness of from about .003 to about .005 inch is successively fed to a feeding station 11, preferably by a Ferguson indexing mechanism.
  • a standard double-edge razor blade 12 which has previously been ground to form the finished cutting edges 13 and 14 is located above the reinforcing strip 10 and is positioned on the strip against one of the flat broad surfaces thereof with their respective broad faces in face-to-face contact with an adhesive layer 15 therebetween.
  • the adhesive layer is preferably a thermal setting adhesive which is pre-coated on the surface of the reinforcing strip that will be placed in contact with the broad surface of the razor blade so that the adhesive layer will be positioned at the interface therebetween.
  • blade can be stainless steel and can be coated with a silicone or polytetrafiuorethylene as is known in the art.
  • the aluminum reinforcing strip is coated with an ad-.
  • the adhesive coated aluminum strip is prepared by coating it with a liquid adhesive which consists essentially of a combination of a butadieneacrylonitrile copolymer and curing phenol-aldehyde resins in a volatile ketone solvent. About 1 dry mil of this adhesive is coated on the strip and then the solvent is substantially completely evaporated at a temperature range progressing from about 140 F. through 260 F. in 5 to minutes.
  • the dried adhesive-coated aluminum is wound up continuously with a polyethylene interleaf so as to permit easy unwinding.
  • Hycar 1042 100 CKR 2620 150 Methyl ethyl ketone 350
  • This adhesive is prepared by first milling the Hycar for approximately 5 minutes on a standard two roll rubber mill at a mill temperature of about 150 F. All of the ingredients are then charged into a Struthers-Wells internally agitated mixer; complete solution takes place in about 8-12 hours.
  • the final liquid adhesive has a viscosity range of about 500-2000 cps. as measured on a Brookfield RVF viscosimeter at 25 C.
  • Hycar 1042 (trade name of B. F. Goodrich, Chemical Division) is a butadiene-acrylonitrile copolymer; it contains about 65% by weight butadiene and 35% by weight acrylonitrile. It is a rubbery solid having a specific gravity of 0.98 and a Mooney viscosity of '70-95.
  • CKR 2620 (trade name of Union Carbide Company) is a phenol-aldehyde resin, which is an alkaline catalyzed resin which is the reaction product of mixed phenols and an excess of formaldehyde.
  • the resin exists as an amber colored lump; it is thermosetting; and its specific gravity is about 1.24 with a melt point of about 200 F.
  • the second adhesive was used to bond the reinforcing strip to a stainless steel razor blade in a flat platen press.
  • the platen on the aluminum side was heated to a temperature range of 325350 F., and the bond was effected in a 5 second cycle at 25-50 p.s'.i.
  • the bonded reinforcing strip and blade were tested by peeling the reinforcing strip from the razor blade at a rate of 3 inches/minute and at a peel angle of 180.
  • the bond made and tested this way had a peel strength of 10-12 lbs/inch and this was satisfactory to resist separation in normal use.
  • the blade has a width of about 0.736 to about 0.738 inch from cutting edge to cutting edge, and the width of the strip from edge to edge is about 0.625 inch.
  • Elongated bayonet slots 20 and 21 of about .085 inch in width are cut out of the center portion of both the blade and reinforcing strip and are used for insertion of a bayonet member of the indexing mechanism for guiding the strip and blade from station to station.
  • Pairs of longitudinally spaced holes 22 and 23 are provided between the bayonet slots 20 and 21 and the edges of the strip and blade which are positioned in alignment with each other when the blade and strip are placed in faceto-face position at the first station. As will be seen these holes are positioned to receive pins of an indexing mechanism for moving the blade once the blades have been cut into single-edge blades and the bayonet slot has been destroyed.
  • the reinforcing strip and blades are tack welded at portions 25 and 26, which are portions that will be cut off subsequently in the formation of the blade and will not form a part of either of the single-edge blades being prepared.
  • the blade and reinforcing strip joined together by tack welding are then moved intermittently by the indexing mechanism to a second station 27 where a reinforcing strip 28 of the same thickness as the first reinforcing strip is placed over the broad surface 29 of the blade so that second strips bayonet slot 30 and pairs of holes 31 align with those of the blade and reinforcing strip as described.
  • the reinforcing strip 28 is precoated with an adhesive on its broad face as described above.
  • the blade with the reinforcing strips tacked to its broad surfaces is then fed to a first sealing station 40 where heat and pressure is applied to the assembly causing the reinforcing strips to become adhesively bonded at the interface between the broad surfaces.
  • a second sealing station 41 may also be provided to heat and pressure seal a second time to insure formation of a good adhesive bond therebetween. It is contemplated that a typical output from the continuous formation will be about 200250 units per minute and the two station sealing time will be /3 second at 350 F.
  • the assembly moves to a first blanking station 42 which removes the center portions of the laminated assembly so as to create two continuous fabricated strips of injector blade assemblies.
  • the severed blades are then fed to a second blanking station 43 by an indexing mechanism which has pins which are insertable into the pairs of holes for moving the blades intermittently along, where they are severed into individual laminated blade assemblies.
  • the finished blade assemblies are then fed to a loading station at which they are loaded into injector blade feeding devices.
  • a substantially hexagonal portion 44 is removed from between the strips, which removes the portions of the laminated assembly at the ends of the bayonet slots and this serves to separate the assembly longitudinally.
  • the single-edge laminated injector razor blade 50 resulting from the practice of the method is shown. It comprises a thin flat metal razor blade 51 of about 0.327 inch in width with a cutting edge 52 formed along one elongated edge of the blade.
  • a first thin flat reinforcing strip 53 of about 0.271 inch in width is adhesively bonded to one flat broad surface 54 of the blade, and a second thin flat reinforcing strip 55 is adhesively bonded to the other flat broad surface 56 of the blade with said respective broad faces of the reinforcing strips and blade in a face-to-face adhesive bond with adhesive layers 57 and 58 at the interfaces therebetween.
  • the interfacial adhesive bond between the reinforcing strips and the blade must be sufiicient to prevent separation therebetween at this interface from the combined compressive and shearing forces on the blade as it is advanced laterally into the spring compression means of the razor head.
  • side edges 61 and 62 of the first and second reinforcing strips extend parallel to but are spaced from the cutting edge by about 0.056 inch so that the cutting edge extends from the side edge of the reinforcing strip an extent sufficient to extend the cutting edge out of the head of the razor in safety cutting position relative to the safety guard of a razor head, as will be seen.
  • the opposite elongated side edges 63 and 64 of the first and second reinforcing strips are coextensive with the elongated edge 65 of the blade.
  • FIG. 4 a second embodiment of a laminated razor blade is shown.
  • This razor blade 66 consists of a thin flat metal razor blade 67 with a cutting edge 68 along one side thereof and a single thin flat reinforcing strip 69 adhesively bonded thereto in the same manner as described in relation to the first double laminated embodiment with an adhesive layer 70 therebetween. It also has the same dimensional characteristics except that the reinforcing strip is from about .004 to about .008 inch thick and preferably nearer the upper range.
  • the razor blade assembly with the single reinforcing strip will be formed according to the same method described in relation to FIG. 1, the only exception being that the lamination of the second reinforcing strip to the blade will be omitted.
  • FIG. 5 a standard injector safety razor head 71 and a portion of the handle 72 are shown.
  • the head assembly consists of a main frame member 73 which is spring biased toward a blade seat member 74 to provide a compressive force on a laminated blade 75 positioned therebetween to hold it in position.
  • a pair of marginal portions, only one of which is indicated as 76, of the blade seat are positioned to abut against the 45 angle portions at the ends of the cutting edge to hold the blade from extending out of the head too far.
  • a guard bar 77 is provided to prevent the cutting edge from being exposed out of its safety cutting position.
  • a laminated razor blade for use in an injector razor comprising a thin flat metal razor blade of resiliently flexible material having a thickness of no greater than about .005 inch, a cutting edge formed along at least one elongated edge of said blade, a thin fiat reinforcing strip having a thickness from about .003 to about .008 inch attached to at least one of the flat surfaces of the blade with their respective broad faces in a face-to-face adhesive bond to define a composite blade having a combined flat and uniform thickness with the end edge of the blade and reinforcing strip defining with their combined thickness an edge surface area suflicient for abut-ting contact with a corresponding edge surface area on the edge of a similar blade, one side edge of the reinforcing strip extending parallel to but spaced from the cutting edge, whereby the cutting edge extends from the side edge of the reinforcing strip an extent sufficient to extend the cutting edge out of the head of the razor in safety cutting position relative to the safety guard of an injector razor.
  • a laminated razor blade according to claim 1 comprising two reinforcing strips, each reinforcing strip adhesively bonded to one of the two broad faces of the blade, said blade having a thickness from about .004 to about .005 inch and each of the reinforcing strips having a thickness of from about .003 to about .005 inch, with the combined thickness of the blade and reinforcing strips being not greater than about .012 inch.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Dry Shavers And Clippers (AREA)
  • Knives (AREA)
US436438A 1965-03-02 1965-03-02 Laminated razor blade for injector razor Expired - Lifetime US3274686A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US436438A US3274686A (en) 1965-03-02 1965-03-02 Laminated razor blade for injector razor
SE1906/66A SE314610B (de) 1965-03-02 1966-02-15
GB7500/66A GB1065933A (en) 1965-03-02 1966-02-21 Laminated razor blade for injector razor
DEE31111A DE1286430B (de) 1965-03-02 1966-02-25 Lamellierte Einschneiden-Rasierklinge und Verfahren zu deren Herstellung
NL6602712A NL6602712A (de) 1965-03-02 1966-03-02

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US436438A US3274686A (en) 1965-03-02 1965-03-02 Laminated razor blade for injector razor

Publications (1)

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US3274686A true US3274686A (en) 1966-09-27

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US436438A Expired - Lifetime US3274686A (en) 1965-03-02 1965-03-02 Laminated razor blade for injector razor

Country Status (5)

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US (1) US3274686A (de)
DE (1) DE1286430B (de)
GB (1) GB1065933A (de)
NL (1) NL6602712A (de)
SE (1) SE314610B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416227A (en) * 1966-10-05 1968-12-17 Ideal Ind Precision laminated stripper blade
US5448035A (en) * 1993-04-28 1995-09-05 Advanced Surfaces And Processes, Inc. Method and apparatus for pulse fusion surfacing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR73601B (de) * 1978-11-10 1984-03-26 Gillette Co
GB2104430B (en) * 1981-08-24 1985-05-09 Gillette Co Securing a razor blade to a support
GB2130510B (en) * 1982-11-24 1986-02-12 Toolmasters Razor blade production

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE498465A (de) *
US794798A (en) * 1905-05-05 1905-07-18 Louis Heckel Safety-razor-blade holder.
US858701A (en) * 1904-10-22 1907-07-02 Heinrich Brokamp Process of manufacturing razor-blades.
US929059A (en) * 1909-01-14 1909-07-27 Edward Weck Razor-blade.
US1458192A (en) * 1919-01-09 1923-06-12 Gillette Safety Razor Co Reenforced blade
US1734554A (en) * 1928-01-28 1929-11-05 American Safety Razor Corp Method of making narrow-gauge razor blades
US1916416A (en) * 1932-01-08 1933-07-04 James E Connolly Method of manufacturing safety razor blades
US2335472A (en) * 1941-07-21 1943-11-30 Gillette Safety Razor Co Safety razor and safety razor blade
US2937976A (en) * 1958-11-25 1960-05-24 Gillette Co Organosiloxane gel coated razor blade
US2983045A (en) * 1958-05-29 1961-05-09 Jr Elroy Diatikar Razor blade adapter for razors
US3111756A (en) * 1961-09-15 1963-11-26 Philip Morris Inc Adjustable injector razor
US3128551A (en) * 1962-03-29 1964-04-14 Philip Morris Inc Adjustable injector razor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB357868A (en) * 1930-10-07 1931-10-01 August Kuhler Kommandit Ges Improvements in or relating to razors
GB428172A (en) * 1934-06-29 1935-05-08 Emma Jaeger Improvements in or relating to safety razor blades
US2113772A (en) * 1935-10-31 1938-04-12 Rothschild Sol Safety razor
US2362504A (en) * 1942-11-19 1944-11-14 Gillette Safety Razor Co Magazine for safety razor blades
GB555189A (en) * 1942-12-01 1943-08-09 Georges Monnet Improvements in razor blades
FR889444A (fr) * 1942-12-28 1944-01-10 Anciens Etablissements Somborn Perfectionnements aux lames tranchantes

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE498465A (de) *
US858701A (en) * 1904-10-22 1907-07-02 Heinrich Brokamp Process of manufacturing razor-blades.
US794798A (en) * 1905-05-05 1905-07-18 Louis Heckel Safety-razor-blade holder.
US929059A (en) * 1909-01-14 1909-07-27 Edward Weck Razor-blade.
US1458192A (en) * 1919-01-09 1923-06-12 Gillette Safety Razor Co Reenforced blade
US1734554A (en) * 1928-01-28 1929-11-05 American Safety Razor Corp Method of making narrow-gauge razor blades
US1916416A (en) * 1932-01-08 1933-07-04 James E Connolly Method of manufacturing safety razor blades
US2335472A (en) * 1941-07-21 1943-11-30 Gillette Safety Razor Co Safety razor and safety razor blade
US2983045A (en) * 1958-05-29 1961-05-09 Jr Elroy Diatikar Razor blade adapter for razors
US2937976A (en) * 1958-11-25 1960-05-24 Gillette Co Organosiloxane gel coated razor blade
US3111756A (en) * 1961-09-15 1963-11-26 Philip Morris Inc Adjustable injector razor
US3128551A (en) * 1962-03-29 1964-04-14 Philip Morris Inc Adjustable injector razor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416227A (en) * 1966-10-05 1968-12-17 Ideal Ind Precision laminated stripper blade
US5448035A (en) * 1993-04-28 1995-09-05 Advanced Surfaces And Processes, Inc. Method and apparatus for pulse fusion surfacing

Also Published As

Publication number Publication date
NL6602712A (de) 1966-09-05
DE1286430B (de) 1969-01-02
GB1065933A (en) 1967-04-19
SE314610B (de) 1969-09-08

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