GB367393A - Improvements relating to the operation of barriers at railroad crossings and the like - Google Patents
Improvements relating to the operation of barriers at railroad crossings and the likeInfo
- Publication number
- GB367393A GB367393A GB3482430A GB3482430A GB367393A GB 367393 A GB367393 A GB 367393A GB 3482430 A GB3482430 A GB 3482430A GB 3482430 A GB3482430 A GB 3482430A GB 367393 A GB367393 A GB 367393A
- Authority
- GB
- United Kingdom
- Prior art keywords
- barrier
- weight
- switch
- relay
- barriers
- Prior art date
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L29/00—Safety means for rail/road crossing traffic
- B61L29/24—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
- B61L29/243—Transmission mechanism or acoustical signals for gates
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
367,393. Operating crossing barriers. HADDAN, R., 31, Bedford Street, Strand, London.-(Belile, J. A.; Telegraph & Signal Department, Estacion Central, F. C. C. del U., Montevideo.) Nov. 19, 1930, No. 34824. [Class 65 (i).] In a level-crossing barrier of the lifting type operated by moving a weight carried on the barrier, the weight is arranged to move in an arc in the vertical plane of the barrier and is operated by an electric motor. In Fig. 3 the mechanism is carried entirely on the barrier, which is pivoted on an axle 7 ; the main part of the barrier extends to the right, and is attached to the mechanism casing shown by means of leaf springs. The balance weight comprises two heavy sectors 12 attached to the sides of a toothed wheel 10 on a spindle carried by the tail of the barrier. The wheel 10 is driven by gearing from an electric motor 17, and pins 21, 22 on either side of the wheel engage trip arms 19, 20 to operate a multiple switch 18 which reverses the circuits of the motor; the pins are so placed on the wheel that the weight is moved beyond the position it occupies when the barrier is in equilibrium at either end of its movement, so that a force is exerted tending to keep the barrier raised or lowered, but this force is insufficient to prevent the barrier from being raised by hand when necessary. The shaft 7 carries cranks connected to fluid check pistons 36, 37 which control the raising and lowering movements of the barrier respectively; the two ends of each cylinder are connected through two adjustable needle valves, the opening of one of which is covered when the piston approaches the inner end of the cylinder, so that the speed of the barrier is normally limited by both valves while it is checked at the end of the stroke by the smaller valve only. The barrier is controlled by a relay 68, Fig. 7, which when energized closes a circuit to certain contacts of the switch 18 for the motor to raise the barrier, and when de-energized closes the circuit to the other contacts of switch 18 for the lowering operation ; this relay may be controlled by treadles operated by passing trains. The initial motion of the weight in either direction does not move the barrier, but brings the weight to the position of equilibrium, and thereafter the barrier moves to remain in equilibrium with the weight ; after the barrier reaches its upper or lower stop, the motor continues to move the weight further, until the switch 18 is operated to reverse the connections. The barrier carries a switch 23, which closes a circuit to energize a relay 55 when the barrier is in its lowered position; the relay controls two lamps 61, 62 which indicate whether the barrier is lowered or raised. The contacts of the switches 23 of the several barriers at a crossing are connected in series, as shown in Fig. 7, so that the relay is only energized when all the barriers are fully lowered. The switch 23, shown in mid-stroke in Fig. 6, comprises a fixed contact 28 and a contact 27 carried by a tube 24, pivoted at its centre. The tube carries permanent bar magnets 41, under the poles of which are fixed pieces of soft iron 42, and a heavy ball 25 runs inside it. The tube is thus held by the magnets in either extreme position until the ball has moved considerably beyond the centre of the tube when the barrier tilts, and is then rapidly rocked over to the other position and held there.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3482430A GB367393A (en) | 1930-11-19 | 1930-11-19 | Improvements relating to the operation of barriers at railroad crossings and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3482430A GB367393A (en) | 1930-11-19 | 1930-11-19 | Improvements relating to the operation of barriers at railroad crossings and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
GB367393A true GB367393A (en) | 1932-02-19 |
Family
ID=10370351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3482430A Expired GB367393A (en) | 1930-11-19 | 1930-11-19 | Improvements relating to the operation of barriers at railroad crossings and the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB367393A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2419624A (en) * | 2004-10-27 | 2006-05-03 | Westinghouse Brake & Signal | Railway level crossings |
-
1930
- 1930-11-19 GB GB3482430A patent/GB367393A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2419624A (en) * | 2004-10-27 | 2006-05-03 | Westinghouse Brake & Signal | Railway level crossings |
GB2419624B (en) * | 2004-10-27 | 2009-02-25 | Westinghouse Brake & Signal | Railway level crossings |
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