US440978A - Case-hardened bar or plate - Google Patents
Case-hardened bar or plate Download PDFInfo
- Publication number
- US440978A US440978A US440978DA US440978A US 440978 A US440978 A US 440978A US 440978D A US440978D A US 440978DA US 440978 A US440978 A US 440978A
- Authority
- US
- United States
- Prior art keywords
- case
- bar
- plate
- hardened
- shell
- 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
Links
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010622 cold drawing Methods 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000007906 compression Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000149 penetrating Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
NITED STATES JAMES II. VAN DORN,
OF CLEVELAND, OHIO.
CASE-HARDENED BAR OR PLATE.
SPECIFICATION forming part of Letters Patent No. 440,978, dated November 18, 1890. Application filed November 26, 1889. Serial No. 331,688. (No model.)
To all whom it may concern:
Be it known that I, JAMES H. VAN DORN, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improved CaseJ-Iardened lWIetal Bar or Plate as an Article of Manufacture; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.
My invention relates to an improved casehardened metal bar or plate, the same being adapted more especially for prison work, such bar being compressed by rolling or drawing cold, or by other means, whereby a hard dense shell is formed as a preparatory step for the case-hardening. Soft steel or iron bars are preferable for prison work on account of their tensile strength, and to me vent such bars from being readily sawed or out they are usually case-hardened. 1f the case-hardening is deep, it renders the bar brittle and easily broken, and consequently worthless for such purpose. On the other hand, if the case-hardening is of little depth, such case-hardened shell is easily broken by reason of its having insufficient backing. It is not therefore a diificult matter to break the thin case-hardened shell of a softmetal bar by means of a sharp blow delivered with a hammer or other blunt tool, whereby such shell is driven into the soft metal beneath. Under such conditions by means of a few well-directed blows and by exercising a little of the patience and perseverance for which prisonersunder such circumstances are noted, in picking out the broken fragments of the case=hardened shell the soft metal of the bar may be exposed, after which the bar can be sawed or out without much difficulty.
In carrying out my invention I select tough strong bars, usually of soft steel or iron and a trifle larger in size than is required for the finished bar. These bars I compress, usually by means of cold-rolling or cold-drawing, to form ahard dense shell, after which the bars are case-hardened in the usual manner. The compression of the metal into such hard shell does not reduce the strength of the bar, and the shell so formed serves two purposes first, it prevents the case-hardening from penetrating too far into the metal, and, second, this compressed shell constitutes such a firm backing for the case-hardening that it is difficult, if not impossible, with any means that a prisoner is likely to have at hand to indent such bar or break the case-hardened shell.
What I claim is- An improved bar or plate compressed by .cold rolling or drawing and subsequently case-hardened.
In testimony whereof I sign this specification,in the presence of two witnesses, this 5th day of November, 1889.
JAMES H. VAN DORN.
Witnesses:
C. H. DORER, ALBERT E. LYNCH.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US440978A true US440978A (en) | 1890-11-18 |
Family
ID=2509874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US440978D Expired - Lifetime US440978A (en) | Case-hardened bar or plate |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US440978A (en) |
-
0
- US US440978D patent/US440978A/en not_active Expired - Lifetime
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