Patent US3708856A successfully refreshed from Google Patents.
US3708856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for repairing worn and deformed railway frogs
Assignee: INDIANA METAL TREATING Inc
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Filing: 1971-09-03
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Granted: 1973-01-09
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Expires: 1991-09-03
Abstract
Abstract Worn and deformed railway crossing frogs are repaired thus: (a) arc-gouge away cracks and battered and work-hardened metal, (b) weld-in gouged cavities while cooling the frog in a water bath, (c) build up new wear surfaces with rod or wire-fed welding while the frog is cooled in the water bath, (d) notch the base walls and flanges (or cut completely apart) to permit straightening, (e) clamp in straightened position, (f) weld in the notches (or reweld the cuts) and (g) machine or grind to shape and size.
Inventors
- 👤 J Keifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:29
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/04; Y; Y10; Y10S; Y10S29/00; Y10S29/048; Y10T; Y10T29/00; Y10T29/49; Y10T29/49718; Y10T29/49746; Y10T29/49748; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
The method of repairing a cast manganese steel railway frog or the like, comprising removing damaged metal at wear surfaces and cracks to expose sound metal for the deposit of new metal in molten state as by welding, submerging the frog in a liquid cooling bath to a level close below the point of metal deposit, filling any deep cavities with weld metal while the frog is so submerged in the cooling bath, and depositing molten weld metal over the exposed sound metal at the wear surfaces to build the same back to a desired level, while the frog is so submerged in the cooling bath, removing the frog from the cooling bath, and subsequently machining the deposited weld metal to provide finished new wear surfaces.
Claim 2
Independent Claim
126 words
The method of repairing a cast manganese steel railway frog or the like, comprising removing damaged metal at wear surfaces and cracks to expose sound metal for the deposit of new metal in molten state as by welding, submerging the frog in a liquid cooling bath to a level close below the point of metal deposit, filling any deep cavities with weld metal while the frog is so submerged in the cooling bath, and depositing molten weld metal over the exposed sound metal at the wear surfaces to build the same back to a desired level, while the frog is so submerged in the cooling bath, removing the frog from the cooling bath, and subsequently machining the deposited weld metal to provide finished new wear surfaces.
Claim 3
Dependent Claim
69 words
The repair method of claim 1 in which the frog after the deposit of new metal to the wear surfaces is warped or bowed, which further comprises, prior to machining, cutting the frog from the bottom to form one or more notches in the side walls and base flanges thereof, bending the notched frog to straighten the same, and welding-in the notches while the frog is in straight position.
Claim 4
Dependent Claim
60 words
The repair method of claim 1 in which the frog after the deposit of new metal to the wear surfaces is warped or bowed, which comprises, prior to machining, cutting the frog apart transversely at one or more locations, positioning the separated parts of the frog in substantially straight aligned position, and re-welding the parts together while in such position.
Claim 5
Dependent Claim
34 words
The repair method of claim 1 further comprising clamping the frog in the cooling bath, to a rigid support, and thereby holding the same against warping or bending during deposit of molten metal thereon.
Claim 6
Dependent Claim
28 words
The repair method of claim 1 in which molten metal is deposited at the wear surfaces in a plurality of substantially continuous beads extending lengthwise of the frog.
Claim 7
Dependent Claim
28 words
The repair method of claim 4 in which molten metal is deposited at the wear surfaces in a plurality of substantially continuous beads extending lengthwise of the frog.
Claim 8
Dependent Claim
23 words
The repair method of claim 2 with the addition that the notches are welded in while the frog is clamped in straight position.
Claim 9
Dependent Claim
29 words
The repair method of claim 2 with the addition that the notches are welded in while the frog is clamped straight and partially submerged in a liquid cooling bath.
Claim 10
Dependent Claim
15 words
The repair method of claim 8 in which the cooling bath is a water bath.
Claim 11
Independent Claim
204 words
The method of repairing a cast manganese-steel railway frog or the like, comprising cleaning the frog of foreign matter, removing damaged metal at wear surfaces and cracks to expose sound metal for the deposit of weld metal, submerging the frog in a liquid cooling bath to a level close below the point of weld-metal deposit, depositing weld metal to fill in the cavities formed during the removal of damaged metal and thereby to provide sound metal in said cavities at a level for deposit of resurfacing metal, while the frog is so submerged in the cooling bath, depositing weld metal in lengthwise beads on sound metal at the wear-surface areas of the frog to bring the same back to the desired level, while the frog is so submerged in the cooling bath, removing the frog from the cooling bath, removing warpage in the thus re-built frog by cutting notches in the side walls and base flanges thereof, from the bottom, at one or more points along the length of the frog, straightening the notched frog, filling the notches of the straightened frog by depositing weld metal therein, and subsequently machining the rebuilt and straightened frog to provide finished new wear surfaces on the frog.
Claim 12
Independent Claim
204 words
The method of repairing a cast manganese-steel railway frog or the like, comprising cleaning the frog of foreign matter, removing damaged metal at wear surfaces and cracks to expose sound metal for the deposit of weld metal, submerging the frog in a liquid cooling bath to a level close below the point of weld-metal deposit, depositing weld metal to fill in the cavities formed during the removal of damaged metal and thereby to provide sound metal in said cavities at a level for deposit of resurfacing metal, while the frog is so submerged in the cooling bath, depositing weld metal in lengthwise beads on sound metal at the wear-surface areas of the frog to bring the same back to the desired level, while the frog is so submerged in the cooling bath, removing the frog from the cooling bath, removing warpage in the thus re-built frog by cutting notches in the side walls and base flanges thereof, from the bottom, at one or more points along the length of the frog, straightening the notched frog, filling the notches of the straightened frog by depositing weld metal therein, and subsequently machining the rebuilt and straightened frog to provide finished new wear surfaces on the frog.
Claim 13
Dependent Claim
33 words
The repair method of claim 10 in which the frog is clamped against bending in the water bath during the deposit of weld metal in the cavities and at the wear surface areas.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |