US3707808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rail grinder
Assignee: Mannix Construction Inc
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Filing: 1970-10-05
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Granted: 1973-01-02
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Expires: 1990-10-05
Abstract
Abstract Grinding stones of a mobile railroad rail grinder are arranged in pairs in grinding units that are themselves mounted in pairs in grinding modules pivotally mounted at both ends and on both sides of a central cab unit of the vehicle. The modules are pivotable between raised and operative positions in which the stones contact the upper rail head surfaces. The vehicle is selfpropelled and an underspeed detector raises the modules part way, enough to move the stones out of contact with the rails, if the vehicle speed diminishes below a minimum. The grinding stones move up and down in pairs, the downward movement being restricted by dash pots to a very slow travel. These features enable the stones to span a trough in the rail head surface and to grind metal only from the higher points thus helping to eliminate rail depressions.
Inventors
- 👤 R Danko
- 👤 D Minge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
E; E01; E01B; E01B31/00; E01B31/02; E01B31/12; E01B31/17
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
189 words
A rail grinder comprising a. a vehicle having wheels for travel along a railroad track, b. at least one grinding unit mounted on said vehicle, said unit having power driven grinding means for removing metal from an upper rail surface, c. said grinding means comprising a pair of bearings supporting respective grinding stones for rotation about vertical axes, said grinding stones being disposed side-by-side in the direction of extent of a track rail, d. first frame means including means fixedly mounting both said bearings on said first frame means in respect of vertical movement to ensure that vertical movement imparted to one of said grinding stones is transmitted to said first frame means and hence to the the other grinding stone, e. second frame means, f. means mounting said first frame means vertically movably on said second frame means, and g. dash pot means extending between said first and second frame means enabling substantially unrestricted upward movement of said second frame means relative to said first frame means while preventing downward movement of said second frame means relative to said first frame means except at a very slow speed.
Claim 2
Dependent Claim
189 words
A rail grinder comprising a. a vehicle having wheels for travel along a railroad track, b. at least one grinding unit mounted on said vehicle, said unit having power driven grinding means for removing metal from an upper rail surface, c. said grinding means comprising a pair of bearings supporting respective grinding stones for rotation about vertical axes, said grinding stones being disposed side-by-side in the direction of extent of a track rail, d. first frame means including means fixedly mounting both said bearings on said first frame means in respect of vertical movement to ensure that vertical movement imparted to one of said grinding stones is transmitted to said first frame means and hence to the the other grinding stone, e. second frame means, f. means mounting said first frame means vertically movably on said second frame means, and g. dash pot means extending between said first and second frame means enabling substantially unrestricted upward movement of said second frame means relative to said first frame means while preventing downward movement of said second frame means relative to said first frame means except at a very slow speed.
Claim 3
Dependent Claim
247 words
A rail grinder comprising a. a vehicle having wheels for travel along a railroad track, b. a plurality of grinding modules movably mounted on said vehicle, c. each said module comprising rail engaging wheel means for supporting the module on a track rail and at least one grinding unit including power driven grinding means for engaging the upper surface of the rail to remove metal therefrom, d. means for moving each said module between a raised position disengaged from the rail and an operative position in which said wheel means and said grinding means engage said rail, e. each of said grinding means comprising a pair of bearings supporting reSpective grind stones for rotation about vertical axes, said grinding stones being disposed side-by-side in the direction of extent of a track rail, f. first frame means including means fixedly mounting both said bearings on said first frame means in respect of vertical movement to ensure that vertical movement imparted to one of said grinding stones is transmitted to said first frame means, and hence to the other grinding stone, g. second frame means, h. means mounting said first frame means vertically movable on said second frame means, and i. dash pot means extending between said first and second frame means enabling substantially unrestricted upward movement of said second frame means relative to said first frame means while preventing downward movement of said second frame means relative to said first frame means except at a very slow speed.
Claim 4
Dependent Claim
247 words
A rail grinder comprising a. a vehicle having wheels for travel along a railroad track, b. a plurality of grinding modules movably mounted on said vehicle, c. each said module comprising rail engaging wheel means for supporting the module on a track rail and at least one grinding unit including power driven grinding means for engaging the upper surface of the rail to remove metal therefrom, d. means for moving each said module between a raised position disengaged from the rail and an operative position in which said wheel means and said grinding means engage said rail, e. each of said grinding means comprising a pair of bearings supporting reSpective grind stones for rotation about vertical axes, said grinding stones being disposed side-by-side in the direction of extent of a track rail, f. first frame means including means fixedly mounting both said bearings on said first frame means in respect of vertical movement to ensure that vertical movement imparted to one of said grinding stones is transmitted to said first frame means, and hence to the other grinding stone, g. second frame means, h. means mounting said first frame means vertically movable on said second frame means, and i. dash pot means extending between said first and second frame means enabling substantially unrestricted upward movement of said second frame means relative to said first frame means while preventing downward movement of said second frame means relative to said first frame means except at a very slow speed.
Claim 5
Dependent Claim
56 words
A rail grinder according to claim 2, including f. means on said vehicle for detecting travel thereof along the track slower than at a predetermined rate, and g. means actuated by said detecting means for energizing said module moving means to raise each module from its operative position to disengage said grinding means from the rail.
Claim 6
Dependent Claim
44 words
A rail grinder according to claim 3, including h. means mounted on each module for detecting raising of the same sufficient to disengage said grinding means from the rail, and i. means actuated by said means (h) for arresting further raising of the module.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |