US1827870A - Fine edged blade - Google Patents

Fine edged blade Download PDF

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Publication number
US1827870A
US1827870A US455366A US45536630A US1827870A US 1827870 A US1827870 A US 1827870A US 455366 A US455366 A US 455366A US 45536630 A US45536630 A US 45536630A US 1827870 A US1827870 A US 1827870A
Authority
US
United States
Prior art keywords
blade
nitrided
edge
nitriding
nitralloy
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
US455366A
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English (en)
Inventor
Thomas H Frost
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US455366A priority Critical patent/US1827870A/en
Priority to US494591A priority patent/US1827871A/en
Priority to US495657A priority patent/US1827872A/en
Priority to GB14628/31A priority patent/GB378543A/en
Priority to FR717425D priority patent/FR717425A/fr
Priority to GB1597931D priority patent/GB379392A/en
Application granted granted Critical
Publication of US1827870A publication Critical patent/US1827870A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/04—Treatment of selected surface areas, e.g. using masks
    • 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
    • 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
    • B26B21/58—Razor-blades characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S76/00—Metal tools and implements, making
    • Y10S76/08—Razor blade manufacturing

Definitions

  • the material I em loy in the construction We of the novel blade 0 my invention is an al- If? of steel containing a substantial amount 0 aluminum, usually combined with chromium or molybdenum or tungsten and which may be hardened by a process of nitriding, that is to say, by introducing nitrogen into, or causin it to combine with the alloy.
  • a oy of this type is known under the name nitrallo by which it is commonly designated.
  • Fig. 1 is a plan view-of the blade upon an enlarged scale, showing certain end areas protected for-nitriding the process
  • Fig. 2 is a similar View of the finished blade 7 I
  • the material employedin producing blades in accordance with m invention may be any nitridable ferrous al oy having the characteristics best suited for the particular type 0 edged tool required; Nitralloy of either of the following analyses has been found satis- 1fisicicalory for the manufacture of razor Element AnalysisA ...2*2... sggassss either case the sheet nitralloy is in "suchcondition that it'may be readily blanked out.
  • the blank thus produced is of the thickness and outline desired in the finished blade and,
  • the blank is paste of stannic oxide 8 in water or-glycerine,
  • each area is generally fanshaped and includes one end of the slot 4 and an elongated end portion of the blade.
  • nitriding operation may be satisfactorily carried out at a temperature of 950 F. in an interval of two hours or somewhat less, while at a temperature of 1150 F. the operation may be complete in as short an interval as five minutes.
  • the temperature and time used for the nitriding of razor blades may be considered as determining the shaving characteristics of the finished blade. For example, a blade nitrided for two hours at 950 F. when finish sharpened in the ordinary manner gives a sharp but fairly rough'edge. If the nitriding operation be carried out at 1150 F. for twenty minutes, the penetration into, or addition of nitrogen to the exposed metal at the higher temperature being more re id and also resulting. in a softer finished prod blade when finish sharpened in the same mana sharp but smooth edge. edged blades and some prefer rou h edged blades and these different types of e ges may be procured inaccordance with my invention by variation of thenitriding temperature to suit the conditions desired.
  • the length of time of nitriding at any given temperature determines the depth of the nitrided case. This case must be deep enough to allow for any material which may betaken ofi duringfinish sharpening operation. The two specified temperatures and .times have been found to be satisfactory. It
  • the two side portlons of the blade are converted into an extremely hard material having edge holding properties of a degree heretofore unattainable.
  • the blade may be then completed by finish grinding its opposite longitudithe usual manner to form the sharpened nitrided cutting edges 12.
  • a safety razor blade comprising a thin flexible wafer of nitralloy internally apertured. and nitrided in, areas adjacent to'its cutting edge.
  • a safety razor blade comprising a thin flexible wafer of nitralloy having a mtrided area including its cutting edge and an unnitrided area merging into the same and permitting expansion of the nitrided area without deformation of the cutting edge.
  • a safety razor blade comprismg a thin I flexible wafer of nitralloy with its opposite longitudinal edges sharpened for cutting and a central longitudinal slot, and being 'nitrided in areas coextensive withsaid slot.
  • a safety razor blade comprising a thin flexible wafer of nitralloy, the blade being nitrided and sharpened at opposite edges and having a central slot of substantially the same length as said edges and unnitrided end I areas beyond said cutting edges.
  • a safety razor blade comprising a thin flexible wafer of nitralloy with opposite cutting edges and a central internal slot, the
  • edge areas of the wafer being nitrided and being connected b unnitrided end portions
  • A. safety razor blade made of a nitridable alloy and comprising a flat body portion' of substantially uniform thickness and an acutely tapered cutting edge portion integral therewith, said blade being nitrided in an areaadjacent to and including its cutting edge and having an area with an unnitrided surface merging'into the same.
  • a safety razor blade made of a nitridable alloy and comprising a thin flat body portion of substantially uniformfthickness and an acutely tapered cuttin edge portion integral therewith, said blade eing nitrided in an area adjacent to and including its cutting edge.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Forests & Forestry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Scissors And Nippers (AREA)
  • Emergency Lowering Means (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Knives (AREA)
US455366A 1930-05-24 1930-05-24 Fine edged blade Expired - Lifetime US1827870A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US455366A US1827870A (en) 1930-05-24 1930-05-24 Fine edged blade
US494591A US1827871A (en) 1930-05-24 1930-11-10 Fine edged blade
US495657A US1827872A (en) 1930-05-24 1930-11-14 Fine edged blade
GB14628/31A GB378543A (en) 1930-05-24 1931-05-18 Improvements in or relating to fine-edged blades, tools and the like
FR717425D FR717425A (fr) 1930-05-24 1931-05-21 Perfectionnements aux lames finement affilées et à leur procédé de fabrication
GB1597931D GB379392A (en) 1930-05-24 1931-06-01 Improvements in or relating to fine edged blades and method of making the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US455366A US1827870A (en) 1930-05-24 1930-05-24 Fine edged blade

Publications (1)

Publication Number Publication Date
US1827870A true US1827870A (en) 1931-10-20

Family

ID=23808496

Family Applications (1)

Application Number Title Priority Date Filing Date
US455366A Expired - Lifetime US1827870A (en) 1930-05-24 1930-05-24 Fine edged blade

Country Status (3)

Country Link
US (1) US1827870A (fr)
FR (1) FR717425A (fr)
GB (1) GB378543A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2623311A1 (de) * 1976-05-25 1977-12-08 Werkzeug Union Gmbh Dwu 5600 W Werkzeug mit galvanisierter klinge und verfahren zur herstellung desselben
FR2436282A1 (fr) * 1978-09-18 1980-04-11 Glaenzer Spicer Sa Tulipe perfectionnee pour joint a tripode et procede pour sa fabrication

Also Published As

Publication number Publication date
FR717425A (fr) 1932-01-08
GB378543A (en) 1932-08-18

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