Patent US4897960A successfully refreshed from Google Patents.
US4897960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railroad crossing gate
Assignee: General Signals Inc
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Filing: 1989-01-03
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Granted: 1990-02-06
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Expires: 2009-01-03
Abstract
Abstract An improved crossing gate for railroad grade crossings. The gate is constructed of an impact-resistant material, and the crossing arm is mounted so that it will swing out of the way and return to its original position if struck by a moving vehicle from either direction. The crossing arm also contains protected lighting that will withstand impact, and provision is made to permit easy replacement of burned-out light bulbs.
Inventors
- 👤 Todd A. Barvinek
- 👤 James W. Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:18
CPC Classifications
E; E01; E01F; E01F13/00; E01F13/04; E01F13/06; B; B61; B61L; B61L29/00; B61L29/02; B61L29/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
A crossing gate for selectively blocking vehicular traffic across a railroad grade crossing, said crossing gate comprising: means for mounting said crossing gate for movement in a generally vertical plane from an upright position not blocking the crossing to a lowered position blocking the crossing, an arm extending outwardly from the mounting means in a direction generally perpendicular to the direction of movement of the vehicular traffic, means combined with said arm and said mounting means and providing for swingable movement of said arm from a position blocking the crossing when force is applied to the arm and providing for return of the arm to its original position blocking the crossing when the force is removed, said arm having at least one translucent portion, means for providing light located inside of the arm behind the translucent portion, and a cushion support for the light providing means.
Claim 2
Dependent Claim
146 words
A crossing gate for selectively blocking vehicular traffic across a railroad grade crossing, said crossing gate comprising: means for mounting said crossing gate for movement in a generally vertical plane from an upright position not blocking the crossing to a lowered position blocking the crossing, an arm extending outwardly from the mounting means in a direction generally perpendicular to the direction of movement of the vehicular traffic, means combined with said arm and said mounting means and providing for swingable movement of said arm from a position blocking the crossing when force is applied to the arm and providing for return of the arm to its original position blocking the crossing when the force is removed, said arm having at least one translucent portion, means for providing light located inside of the arm behind the translucent portion, and a cushion support for the light providing means.
Claim 3
Dependent Claim
26 words
The crossing gate of claim 1 in which the cushion support is suspended inside of the arm so as to freely float inside of the arm.
Claim 4
Dependent Claim
237 words
A crossing gate for selectively blocking vehicular traffic across a railroad grade crossing, said crossing gate comprising: means for mounting said crossing gate for movement in a generally vertical plane from an upright position not blocking a crossing to a lowered position blocking the crossing, an arm extending outwardly from the mounting means in a direction generally perpendicular to the direction of movement of the vehicular traffic, the outer potion of said arm being made of an impact-resistant and somewhat flexible material, a supporting base having surfaces inclined upwardly and outwardly from a groove aligned with the arm and supporting the inner end of the arm with the inner end normally resting in the groove, a vertical pivot extending through the inner end of the arm and the supporting base to provide for swingable movement of the arm from a position blocking the crossing when force is applied to the arm, means normally biasing the inner end of the arm into the groove of the supporting base with the inclined surfaces providing resistance to swingable movement of said arm from its normal position blocking the crossing, and friction reducing means between the arm and the inclined surfaces of the supporting base to facilitate movement of the inner end of the arm up and down the inclined surfaces when force is applied to the arm in a direction generally perpendicular to the vertical plane of the arm's movement.
Claim 5
Dependent Claim
237 words
A crossing gate for selectively blocking vehicular traffic across a railroad grade crossing, said crossing gate comprising: means for mounting said crossing gate for movement in a generally vertical plane from an upright position not blocking a crossing to a lowered position blocking the crossing, an arm extending outwardly from the mounting means in a direction generally perpendicular to the direction of movement of the vehicular traffic, the outer potion of said arm being made of an impact-resistant and somewhat flexible material, a supporting base having surfaces inclined upwardly and outwardly from a groove aligned with the arm and supporting the inner end of the arm with the inner end normally resting in the groove, a vertical pivot extending through the inner end of the arm and the supporting base to provide for swingable movement of the arm from a position blocking the crossing when force is applied to the arm, means normally biasing the inner end of the arm into the groove of the supporting base with the inclined surfaces providing resistance to swingable movement of said arm from its normal position blocking the crossing, and friction reducing means between the arm and the inclined surfaces of the supporting base to facilitate movement of the inner end of the arm up and down the inclined surfaces when force is applied to the arm in a direction generally perpendicular to the vertical plane of the arm's movement.
Claim 6
Dependent Claim
40 words
The crossing gate of claim 3 in which the means normally biasing the inner end of the arm into the groove includes a spring around the vertical pivot and engaging the upper surface of the inner end of the arm.
Claim 7
Dependent Claim
38 words
The crossing gate of claim 4 in which the friction reducing means includes a pair of ball bearings, one on each side of the vertical pivot, the ball bearings normally resting in the groove in the supporting base.
References Cited (Backward Citations)
US1665043A
Cited
US1996196A
Cited
US2352310A
Cited
US2401275A
Cited
US2874493A
Cited
US3024550A
Cited
US4124955A
Cited
US4364200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |