Chapter LVI: 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.

=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.

=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.