US153115A - Improvement in processes for tempering the blades of squares - Google Patents
Improvement in processes for tempering the blades of squares Download PDFInfo
- Publication number
- US153115A US153115A US153115DA US153115A US 153115 A US153115 A US 153115A US 153115D A US153115D A US 153115DA US 153115 A US153115 A US 153115A
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- US
- United States
- Prior art keywords
- blade
- blades
- tempering
- squares
- improvement
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- 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
- 238000000034 method Methods 0.000 title description 14
- 238000005496 tempering Methods 0.000 title description 14
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000875 corresponding Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
Definitions
- Figure 1 a perspective view of one part, Fig. 2, a perspective view of the other part, of the tempering device; and in Fig. 3, a transverse section of the two parts as set together upon the blade.
- This invention relates to an improvement in method of tempering the blades of squares.
- the object of this invention is to harden the blades only at the edges, and prevent the possibility of their twisting during the process; and it consists in placing the blade, when heated to the proper extent for tempering, between two cold metal clamps, which will closely clasp the blade at the two edges, and thereby chill and harden the edges, while the remainder of the blade is exposed to the atmosphere,
- A is one part, and 13 the other part, of the clamp. Through the center of these a channel, 13, is formed, deeper than the thickness of the blade, and a little less in width than the blade; and upon each edge of this channel a rabbet, a, is formed, corresponding to the thickness of the blade, or a very little less.. This may be all in one part, or half in each, as shown.
- the blade denoted in solid black, Fig. 3, is heated to the proper degree for hardening, and then laid into one of the clamps, and the other closed upon it, as seen in Fig. 3, grasping the edge of the blade, so as to prevent its twisting either transversely or longitudinally.
- These clamps are cold, and hence instantly chill the blade, so as to give to the blade the required temper.
- the channels B allow 'a freecirculation of air through the clamps above and below the blade, over the central portion, or between the two edges or chills; hence this portion will cool so slowly that it will be very much softer than the edges which have been chilled, and render it almost impossible to break the blade.
- Intermediate supports may be placed in the channels, as shown; but these are not essential. Such bearings or supports may be made to ornament the surface ot the blade, as the point touched by these bearings in the chill will be indicated on the polished surface of the blade, or the same browned with acid.
- This process is applicable not only to the tempering ot' the blades of squares, but to analogous uses, such as steel scales, straightcdges,
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Description
I. 1. ROB|NSON.. Processes for Tampering the Blades (If-Squares.
No.l53,ll5. PatentedJuIy14,1874.
THE GRAPNIO C0. PHOYO'LITHJSk 4'! PARK PLACE, NY.
UNITED STATES PATENT OFFICE.
ISAIAH J. ROBINSON, OF ST. J OHNSBURY, VERMONT, ASSIGNOR TO THE ST. JOHNSBURY TOOL COMPANY, OF SAME PLACE.
IMPROVEMENT lN PROCESSES FOR TEMPERlNG THE BLADES 0F SQUARES.
Specification forming part of Letters Patent No. 153,115, dated July 14, 1874; application filed May 11, 1874. P
To all 'whom it may concern:
Be it known that I, ISAIAH J. ROBINSON, of St. Johnsbury, in the county of Caledonia and State of Vermont, have invented a new Improvement in Process of Temperin g the Blades of Squares; and I do hereby declare the following, when taken in connection with the accompanyin g drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-
Figure 1, a perspective view of one part, Fig. 2, a perspective view of the other part, of the tempering device; and in Fig. 3, a transverse section of the two parts as set together upon the blade.
This invention relates to an improvement in method of tempering the blades of squares.
In the usual method of tempering by immersion it is impossible to prevent the blade from twisting or springing out of shape, 11eeessitating a subsequent operation to bring the blade back into proper shape. 13y such method the blade is hardened alike throughout, whereas the edges only require to be hardened; and if the blade be hardened only at the edges, then it is less liable to spring and break.
The object of this invention is to harden the blades only at the edges, and prevent the possibility of their twisting during the process; and it consists in placing the blade, when heated to the proper extent for tempering, between two cold metal clamps, which will closely clasp the blade at the two edges, and thereby chill and harden the edges, while the remainder of the blade is exposed to the atmosphere,
as more fully hereinafter described.
A is one part, and 13 the other part, of the clamp. Through the center of these a channel, 13, is formed, deeper than the thickness of the blade, and a little less in width than the blade; and upon each edge of this channel a rabbet, a, is formed, corresponding to the thickness of the blade, or a very little less.. This may be all in one part, or half in each, as shown. luide-pins d, or other suitable device, should be provided, that the two may be set together in a proper corresponding position.
The blade, denoted in solid black, Fig. 3, is heated to the proper degree for hardening, and then laid into one of the clamps, and the other closed upon it, as seen in Fig. 3, grasping the edge of the blade, so as to prevent its twisting either transversely or longitudinally. These clamps are cold, and hence instantly chill the blade, so as to give to the blade the required temper. The channels B allow 'a freecirculation of air through the clamps above and below the blade, over the central portion, or between the two edges or chills; hence this portion will cool so slowly that it will be very much softer than the edges which have been chilled, and render it almost impossible to break the blade.
This method of tempering leaves the effect apparent upon the blade, as the edges which are chilled will appear finer after polishing than the central portion, which is not equally hard.
Intermediate supports may be placed in the channels, as shown; but these are not essential. Such bearings or supports may be made to ornament the surface ot the blade, as the point touched by these bearings in the chill will be indicated on the polished surface of the blade, or the same browned with acid.
This process is applicable not only to the tempering ot' the blades of squares, but to analogous uses, such as steel scales, straightcdges,
I claim as my invention- The process herein described for hardening steel plates, the same consisting in grasping the plate between metal chills, constructed to bear only upon. that portion of the surface of the blade which is required to be hardened, and expose the remaining portion to the surrounding atmosphere.
[SATAH J. ROBINSOX.
Witnesses N. M. JoHNsoN, T. FAIRBANKS.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US153115A true US153115A (en) | 1874-07-14 |
Family
ID=2222526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US153115D Expired - Lifetime US153115A (en) | Improvement in processes for tempering the blades of squares |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US153115A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2433627A (en) * | 1943-05-21 | 1947-12-30 | Rca Corp | Treatment of metals |
| US2572201A (en) * | 1948-02-10 | 1951-10-23 | Air Reduction | Method of hardening the ends of railroad rails |
| US2765161A (en) * | 1952-06-03 | 1956-10-02 | William Mungall | Jig for selective hardening of steel rings |
| US4305272A (en) * | 1979-04-05 | 1981-12-15 | Ralph Mckay Limited | Agricultural discs |
-
0
- US US153115D patent/US153115A/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2433627A (en) * | 1943-05-21 | 1947-12-30 | Rca Corp | Treatment of metals |
| US2572201A (en) * | 1948-02-10 | 1951-10-23 | Air Reduction | Method of hardening the ends of railroad rails |
| US2765161A (en) * | 1952-06-03 | 1956-10-02 | William Mungall | Jig for selective hardening of steel rings |
| US4305272A (en) * | 1979-04-05 | 1981-12-15 | Ralph Mckay Limited | Agricultural discs |
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