. Air brake text for engineers and firemen; . brake cylinder airflows through pipe h into slack adjuster cylinder 2, where thesmall piston 19 (Fig. 2) is forced outward, compressing spring21. Attached to piston stem 23 is a pawl extending into casing24, which engages ratchet wheel 2y, mounted within casing 24,upon screw 4 (Fig. i). When the brake is released, and the brakecylinder piston returns to its normal position, the air pressure incylinder 2 escapes to the atmosphere through pipe h, port a andthe non-pressure head of the brake cylinder, thus permittingspring 21 (Fig. 2) to force the sma
. Air brake text for engineers and firemen; . brake cylinder airflows through pipe h into slack adjuster cylinder 2, where thesmall piston 19 (Fig. 2) is forced outward, compressing spring21. Attached to piston stem 23 is a pawl extending into casing24, which engages ratchet wheel 2y, mounted within casing 24,upon screw 4 (Fig. i). When the brake is released, and the brakecylinder piston returns to its normal position, the air pressure incylinder 2 escapes to the atmosphere through pipe h, port a andthe non-pressure head of the brake cylinder, thus permittingspring 21 (Fig. 2) to force the small piston to its normal po-sition. In so doing, the pawl turns the ratchet wheel upon screw 4and thereby draws lever 5 slightly in the direction of the slackadjuster cylinder, thus shortening the piston travel and forcingthe brake shoe nearer the wheels. the pawl is drawn backto its normal position a lug on the lower side strikes projectiona (Fig. 3) on the cylinder, thus raising the outer end of the pawl. AUTOMATIC SLACK ADJUSTER. 109. PLATE 45—FIGURE 1. no AUTOMATIC SLACK ADJUSTER. disengaging it from the ratchet wheel, and permitting thescrew to be turned by hand if desired. The screw mechanismis so proportioned that the piston travel is reduced only abouti/32-inch by each operation, which removes the danger of undulytaking up false travel.
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookidairbraketextfore00nati
