Section 62.—PAWL AND RATCHET MOTIONS.
INTERMITTENT MOTION.
[1132]. The common ratchet-wheel and pawl, or detent.
[1133]. Ditto, with compound pawls to check angular motion less than the pitch of the teeth.
[1134]. Locking pawl.
[1135]. Strut-action pawl.
[1136]. Indiarubber ball pawl; sometimes a solid roller is substituted for the indiarubber ball.
[1137]. Reverse ratchets, for continuous feed from an oscillating arm.
[1138]. Ball and socket ratchet, will work at an angle.
[1139]. Pawl, used with ordinary spur teeth, and sometimes made reversible (see dotted lines), to drive the opposite way.
[1140]. Ratchet bosses.
[1141]. Silent pawl; the pawl is lifted out of gear while reversing by the motion of the toggle joint and lever.
[1142]. Crown ratchet and pawl.
[1143]. Application of [No. 1136] as a silent feed motion.
[1144]. Click and detent continuous feed motion.
[1145]. Hare’s foot ratchet motion with detent.
[1146]. Silent feed. The jaw grips the rim of wheel when moving in one direction and runs loose the other way.
[1147]. Reciprocating into intermittent rotary motion.
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[1148]. Reciprocating circular motion into intermittent circular ditto, Kaiser’s patent.
[1149]. Continuous circular motion into intermittent ditto, Kaiser’s patent. The wheel A is locked by the ring C while the finger B is out of gear, the ring then passing between the teeth of A.
[1150]. Cam-ring intermittent feed motion.
[1151]. Modification of the last named; in both the wheel is locked during the dead movement of the cam by the flange passing between the teeth.
[1152]. Slot wheel and pin gear.
[1153]. Segment-wheel intermittent feed motion; locked during the dead movement of driving wheel.
[1154]. The pawl is lifted out of gear at each revolution of the pin wheel A and the ratchet moved one or more teeth.
[1155]. Double pawls and links for continuous feed motion.
[1156]. The cam A is eccentric to the wheel B, and slips out of gear at any required point while the driving wheel makes a partial revolution.
[1157]. Spring-pawl feed motion; the large wheel with pawl attached drives the ratchet wheel.
[1158]. Rocking lever and double pawls for raising a rack.
[1159]. Internal pawls, dropping into gear by gravitation.
[1160]. The pawl is lifted out of gear by the act of putting the handle on the square end of shaft, the handle having a boss shaped so as to lift the pawl.
[1161]. Star wheel and fixed pawl for conveying intermittent motion to screw on revolving disc; used for boring-bars, slide rests, &c.
[1162]. Pendulum and ratchet escapement.
[1163]. Cylinder escapement.
[1164]. Pendulum and double ratchet wheel escapement.
[1165]. Enlarged plan of cylinder escapement.
[1166]. Lever escapement.
[1167]. Double pawl and pin wheel escapement.
[1168]. Three-leg pendulum escapement.
[1169]. Self-sustaining ratchet motion. Pulling the cord A throws the pawl out of gear by the straightening of the cord forcing back the bent pawl lever.
[1170]. Verge escapement.
[1171]. Intermittent circular motion by revolving pawl and detent.
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[1172]. Spanner ratchet; a simple spanner having a pin near one end of one of the jaws which slips into the teeth of the ratchet wheel.
[1173]. V pawl; operates by wedging itself between the V flanges.
[1174]. Gravity pawls and ratchet wheel.
[1175]. Ratchet wheel, used to govern the striking gear of a clock.
[1176]. The pawl is hinged to the jointed end of the lever, and is pulled out of gear by the return movement of the rod—silent feed.
[1177]. Pawl and rack.
[1178]. Roller and inclined segmental recess for silent feed motion.
[1179]. Gripping pawls and ring for silent feed motion.
Snail ratchet, [No. 725].