Patent GB-191025300-A (GB)
Title: Improvements in Catch Stops for Railway or other Level Crossing Gates.
IPC: B61L29/02
Filed: 1910-10-31
Granted: 1911-03-02
Abstract: 25,300. McKenzie & Holland, and Burleigh, W. F. Oct. 31. Fastenings, operated mechanically from a distance. - Relates to apparatus for locking the gates of level-crossings in which the gate stops and catches situated in the roadway are not allowed to rise until the gates approach close to them. In casings in the roadway are slidably mounted rods 18, 24. The rod 24 carries a projection 24<a> secured to which is a pin 24<b> carrying two rollers 24<c>. The rod 18 has jaws 18<a>. A gatestop operating-lever 19, catches 25, 25<a>, and detectors 26, 26<a> are mounted on a pivot pin 11, which may be readily dropped into bearings in the casing. The lever 19 has a projection 19<a> engaged between the jaws 18<a> and two projections 19<b>, which engage projections 25<b> on the catches 25,25<a>. A projection 25<d> on each of the catches 25, 25<a> engages the weighted end 26<b>, Fig. 2<a>, of the detectors 26, 26<a>. The arrangement in the six-foot way consists, as shown in Fig. 8, of a rod 29 mounted slidably in a casing and provided with bearings carrying rollers 29<a>, 29<b>, 29<c> and a projection 29<d>. Weighted catches 32, 32<a> and a gate - stop operating-lever 30 are mounted on a pin which may be dropped into bearings in the casing. The catches have projections 32<b>, 32<c>, and the lever 30 carries a roller 30<a>. The sliding rods 24, 29 are each connected by rods 23, 28 to an operating-lever 22, Fig. 7, and the sliding rod 18 is connected, by the rod 17 and the mechanism shown in Fig. 5, to a rod 12 which operates the gate crab to open the gates. To move the gates from the position shown, wherein the gates are across the roadway, to across the permanent way, the signalman first moves the lever 22 from A to B. This moves the rod 24 to the right, bringing the rollers 24<c> beneath the weighted ends of the catches 25, 25<a>, thereby lowering them and, through the action of the projections 25<d>, the detectors 26, 26<a> also. The rod 29 is also moved to the right, thereby freeing the rollers 29<a>, 29<b>, 29<c> of the catches 32, 32<a> and lever 30, which is operated by the projection 29<d> and roller 30<a> to raise the gate stop 31. The gate-operating rod 12 is now moved in the direction shown by the arrow, and this movement is transmitted bv a link 13 and bell-cranks 14, 15 to the rod 17. The movement from E to F of the bell-crank 14 moves the bell-crank 15 from H to J, so that its surface 15<b> is concentric with the pivot pin of the bell-crank 14. This movement of the rod 17 during the first movement of the gate moves the rod 18 to the right and thereby lowers the gate stop 20 by means of its operating-lever 19. When the gates are moved over, the lever 22 is moved from B to C, thereby bringing the rollers 24<c> fully beneath the catches 25, 25<a>, the rollers 29<a>, 29<b> against the projections 32<b>, 32<c>, and the plate 29<d> beneath the roller 30<a>, thus securing all the catches. To reverse the gates from this position, the lever 22 is first moved from C to D, thus lowering the stops and catches in the six-foot way and freeing the catches 25, 25<a> and consequently the detectors 26, 26<a> in the roadway. The detectors are prevented from rising by the projections 19<b> of the gate-stop operating-lever 19, which, by the action of the bellcranks 14, 15, is not operated until the gates are nearly closed. When the movement of the gates is nearly completed, the stops, detectors. and catches are raised, but the completion of the stroke from D to A of the lever 22 is prevented until the gates depress the detectors 26, Fig. 2<a>. free of the pin 24<b> on the rod 24. When this has taken place, the stroke from D to A may be performed so as to move the rollers 29<a>, 29<b>, 29<c> beneath the weighted ends of the catches 32, 32<a> and lever 30, and the rollers 24<c> against the projections 25<b> of the levers 25, 25<a>, thus securing all the catches and stops in the position shown.