US685299A - Method of sharpening worn-out files. - Google Patents

Method of sharpening worn-out files. Download PDF

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Publication number
US685299A
US685299A US5146401A US1901051464A US685299A US 685299 A US685299 A US 685299A US 5146401 A US5146401 A US 5146401A US 1901051464 A US1901051464 A US 1901051464A US 685299 A US685299 A US 685299A
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Prior art keywords
files
sharpening
worn
out files
nitric acid
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US5146401A
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Frank Rowley
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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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/06—Sharpening files

Definitions

  • the object of my improvement is to render the action of the nitric acid more certain and regular. For this purpose after washing and brushing the files with soap and soda and rinsing them in water I immerse and pickle them for about half an hour in diluted sulfuric acid, one part of commercial acid being mixed with about four parts of water.
  • the sulfuric acid slightly corrodes or attacks the surface of the file and prepares it for the subsequent action of the nitric acid, imparting a surface to the file which enables the subsequent process to operate more certainly and efficiently and to produce a greater and more uniform sharpness of the tooth than when such pre* 5 liminary pickling is not applied
  • I claim as my invention- The method of sharpening worn-out files by 5 5 first cleansing them with soap and soda and rinsing them in water, then immersing them in diluted sulfuric acid and drawing a needie-point through the grooves of the file, cleaning and drying them, coating the worn -6o tops with 'a varnish capable of resisting the corrosive action of acids and immersing them in diluted nitric acid.

Description

UNITED STATES PATENT OFFIGE.
FRANK ROWLEY, OF WHALEY BRIDGE, ENGLAND.
METHOD OF SHARPENING WQRN-OUT FILES.
SPECIFICATION forming part of Letters Patent No. 685,299, dated October 29, 1901.
Application filed March 16, 1901. Serial No. 51,464. (No specimens.)
To all whom it may concern.-
Be it known that I, FRANK ROWLEY, a sub get of the Queen of Great Britain, residing at ock Cottage, Whaley Bridge, in the county of Chester, England, have invented new and useful Improvements in the Process of Sharpening Worn-Out Files, of which the following is a specificationt This invention relates to the method of sharpening files described in the British patent specification, No. 19,326, A. D. 1893; and it consists in the hereinafter-described improvements therein. In carrying out the said method it has been found that notwithstand- I 5 ing a thorough cleansing of the files in soap and soda and rinsing in water the nitric acid in many cases was acting slowly and irregularly in attacking and biting away the bottom and sides of the teeth.
The object of my improvement is to render the action of the nitric acid more certain and regular. For this purpose after washing and brushing the files with soap and soda and rinsing them in water I immerse and pickle them for about half an hour in diluted sulfuric acid, one part of commercial acid being mixed with about four parts of water. The sulfuric acid slightly corrodes or attacks the surface of the file and prepares it for the subsequent action of the nitric acid, imparting a surface to the file which enables the subsequent process to operate more certainly and efficiently and to produce a greater and more uniform sharpness of the tooth than when such pre* 5 liminary pickling is not applied With the same object after pickling the files in sulfuric acid, as aforesaid, I also draw the point of a needle through all the grooves of the file, slightly scraping or scratching the surface of the bottom of the grooves, in consequence of which the nitric acid is enabled to act more certainly at this point and bite away the sides of the teeth from the bottom toward the top. After cleaning and drying the files I coat the worn or fiat tops of the teeth with varnish, such as Brunswick black, capable of resisting the corrosive action of acids, and immerse them in a mixture of nitric acid and water in the manner described in the aforesaid specification till the bottom and sides of the teeth are bitten away sufficiently to throw off the fiat tops, leaving the newly-formed teeth Very sharp.
I claim as my invention- The method of sharpening worn-out files by 5 5 first cleansing them with soap and soda and rinsing them in water, then immersing them in diluted sulfuric acid and drawing a needie-point through the grooves of the file, cleaning and drying them, coating the worn -6o tops with 'a varnish capable of resisting the corrosive action of acids and immersing them in diluted nitric acid.
In testimony whereof I have hereunto set my hand in the presence of two witnesses FRANK ROWLEY.
Witnesses:
R. J. URQUHART, O. BoLLn.
US5146401A 1901-03-16 1901-03-16 Method of sharpening worn-out files. Expired - Lifetime US685299A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750345C (en) * 1936-11-28 1945-01-09 Method for sharpening files, rasps and the like like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750345C (en) * 1936-11-28 1945-01-09 Method for sharpening files, rasps and the like like

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