Railroad switch snow deflecting air nozzle apparatus

• US 4,695,017 A
• Filed: 12/23/1986
• Issued: 09/22/1987
• Est. Priority Date: 08/19/1983
• Status: Expired due to Fees

• Current Assignee: National Research Council Canada
• Original Assignee: Canadian Patents and Development Limited
• Inventors: Ringer, Thomas R., Bramwell, Byrne E.
• Primary Examiner(s): Reese, Randolph A.
• Application Number:
  US07/004,210
• Time in Patent Office: 273 Days
• Field of Search: 246/428, 239/552, 239/568, 126/271.2 B
• US Class Current: 246/428
• CPC Class Codes: E01B 19/00 Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise snow fences E01F7/02, snow-ploughs E01H8/02, watering E01H11/00
• CPC Class Codes: E01B 7/00 Switches; Crossings operating mechanisms B61L
• CPC Class Codes: Y02A 30/30 in transportation, e.g. on roads, waterways or railways

Abstract

A railroad switch, snow deflecting apparatus is described in which air is fed through conduits to primary nozzles for directing air along the rails and towards the switch points to a position adjacent the apex of the switch. Secondary nozzles are spaced from the primary nozzles and behind the switch points so as to direct air along and between movable rails of the railway switch, and in the same direction as air from the primary nozzles to maintain the railway switch operationally free of snow.

Claims

1. A railroad switch snow deflecting air nozzle apparatus, comprising:

(a) a first elongate conduit for transporting air under and transversely of stationary rails of the switch to a location ahead of switch points thereof,

(b) at least one primary nozzle extending from the first conduit and having an open nozzle end for directing air along the rails and towards the switch points to a position adjacent the apex of the switch and in a direction from the apex towards the heel of the switch,

(c) a second elongate conduit for transporting air under and transversely of the stationary rails to a location spaced from the said at least one primary nozzle and behind the switch points,

(d) at least one secondary nozzle extending from the secondary conduit and having an open nozzle end for directing air along and between movable rails of the railway switch, and in the same direction as air from the said at least one primary nozzle, each said secondary nozzle being about halfway between the apex and the heel of the switch to effectively act in series with a respective said primary nozzle,

(e) air supply means, having a snow protected air inlet, for supplying air at ambient temperatures to the first and second conduits for air to exit from the said at least one primary nozzle at a velocity of the order of 100 mph and from the said at least one secondary nozzle at a velocity of the order of 100 mph to prevent the entry of any falling snow or rain into the switch, and

(f) automatic control means associated with remotely controlled sensors to activate the apparatus at the onset of snow or freezing rain, whereby

(g) in operation, the railroad switch is maintained operationally free of snow.

2. Apparatus according to claim 1, wherein two primary and two secondary nozzles are provided.

3. Apparatus according to claim 2 which includes at least one further elongate conduit, for receiving air from the air supply means, and for transporting air to a position between the secondary nozzles and a heel of the switch, and at least one tertiary nozzle extending from the said at least one further elongate conduit and having an open nozzle end for directing air along the rails, in the same direction as air from the primary and secondary nozzles, and towards the heel of the switch.

4. Apparatus according to claim 3, wherein the said at least one tertiary nozzle is bifurcated at the air outlet end to provide two, divergent air outlets.

5. Apparatus according to claim 2, wherein each primary nozzle is bifurcated at the air outlet end to provide two, divergent air outlets.

6. Apparatus according to claim 1 which includes at least one further elongate conduit for receiving air from the air supply means, and for transporting air to a position between the secondary nozzles and a heel of the switch, and at least one tertiary nozzle extending from the said at least one further elongate conduit and having an open nozzle end for directing air along the rails, in the same direction as air from the primary and secondary nozzles, and towards the heel of the switch.

7. Apparatus according to claim 6, wherein the said at least one tertiary nozzle is bifurcated at the air outlet end to provide two, divergent air outlets.

8. Apparatus according to claim 1, wherein each primary nozzle is bifurcated at the air outlet end to provide two, divergent air outlets.

9. A railroad switch snow deflecting air nozzle apparatus, comprising:

(a) a first elongate conduit for transporting air under and transversely of stationary rails of the switch to a location ahead of switch points thereof,

(b) a pair of primary nozzles extending from the first conduit and each having an open nozzle end for directing air along the rails and towards the switch points to a position adjacent the apex of the switch and in a direction from the apex towards the heel of the switch,

(c) a second elongate conduit for transporting air under and transversely of the stationary rails to a location spaced from said primary nozzles and behind the switch points,

(d) a pair of secondary nozzles extending from said second conduit and each having an open nozzle end for directing air along and between movable rails of the railway switch, and in the same direction as air from said primary nozzles, said pair of secondary nozzles being about one third the distance between the apex and the heel of the switch to effectively act in series with said pair of primary nozzles,

(e) a third elongate conduit for transporting air under and transversely of the stationary rails to a location spaced from said secondary nozzles on the side farthest from said primary nozzles,

(f) a pair of tertiary nozzles extending from said third conduit and each having an open nozzle end for directing air along and between movable rails of the railway switch, and in the same direction as air from said primary nozzles, said pair of tertiary nozzles being about two thirds the distance between the apex and the heel of the switch to effectively act in series with said pair of primary nozzles and said pair of secondary nozzles,

(g) said first, second and third conduits being of rectangular cross-section and said nozzles being bifurcated and of rectangular cross-section, each nozzle protruding from the top surface of the respective conduit, the nozzles being at least partially supported by the railroad ties with the nozzles located below the top level of the rails,

(h) said first, second and third conduits being connected together by a conduit of substantially circular cross-section,

(i) air supply means, having a snow protected air inlet, for supplying air at ambient temperatures to the first, second and third conduits for air to exit from said primary nozzles at a velocity of the order of 100 mph and from said secondary and tertiary nozzles at a velocity of the order of 100 mph to prevent the entry of any falling snow or rain into the switch,

(j) one of said rectangular conduits being continued and being connected to the outlet of said air supply means,

(k) automatic control means associated with remotely located sensors to activate the apparatus at the onset of snow or freezing rain,

whereby,

(l) in operation, the railroad switch is maintained operationally free of snow.