American Practice in Block Signaling With Descriptions And Drawings of the Dif
American Practice in Block Signaling With Descriptions And Drawings of the Dif
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3, D) secured to the roller by a- set screw, and having cut through it above the roller a radial slot through which projects horizontally a peculiarly shaped locking lever, provided with a small latch or tongue pivoted near its centre, and capable of a horizontal movement right and left on its pivot, but held in a central position, parallel with the lever on which it is pivoted, by a flat spring on each side. This latch, like the lever, extends through the slot in the quadrant and ends flush wi...th the end of the lever. The lever with the latch thus arranged is pivoted in a suitable bracket fast to the machine, and connected at its far end with the armature of an electro-magnet (fig. 3, _E r ), the circuit to which is controlled directly by the lock pin of the switch movement. This circuit is normally open, i. E. , when the switch is locked, and closed during its operation. The armature of the magnet, there- fore, normally hangs by gravity away from the magnet and keeps the end of the lever, projecting through the quadrant, elevated, so that a small steel pin in the centre of the upper inside slot of this quadrant, when the switch lever is thrown beyond the vertical position, strikes the latch or tongue and carries its free end with it as far as its con- struction will permit ; the lever then will have been moved sufficiently far to have oper- ated the valve, and consequently moved the switch, but not far enough to have made the contact between the strips controlling the signal.
What to read after American Practice in Block Signaling With Descriptions And Drawings of the Dif?
You can find similar books in the "Read Also" column, or choose other free books by Robert Bickerstaffe Holt to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
3, D) secured to the roller by a- set screw, and having cut through it above the roller a radial slot through which projects horizontally a peculiarly shaped locking lever, provided with a small latch or tongue pivoted near its centre, and capable of a horizontal movement right and left on its pivot, but held in a central position, parallel with the lever on which it is pivoted, by a flat spring on each side. This latch, like the lever, extends through the slot in the quadrant and ends flush wi...th the end of the lever. The lever with the latch thus arranged is pivoted in a suitable bracket fast to the machine, and connected at its far end with the armature of an electro-magnet (fig. 3, _E r ), the circuit to which is controlled directly by the lock pin of the switch movement. This circuit is normally open, i. E. , when the switch is locked, and closed during its operation. The armature of the magnet, there- fore, normally hangs by gravity away from the magnet and keeps the end of the lever, projecting through the quadrant, elevated, so that a small steel pin in the centre of the upper inside slot of this quadrant, when the switch lever is thrown beyond the vertical position, strikes the latch or tongue and carries its free end with it as far as its con- struction will permit ; the lever then will have been moved sufficiently far to have oper- ated the valve, and consequently moved the switch, but not far enough to have made the contact between the strips controlling the signal.
What to read after American Practice in Block Signaling With Descriptions And Drawings of the Dif?
You can find similar books in the "Read Also" column, or choose other free books by Robert Bickerstaffe Holt to read onlineMoreLess
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