Chapter XLII: Section 49: Locking Devices

=898. Common sliding bolt.=

=899. Common latch.=

=900. Cam locking bolt;= locks the bolt when either in or out, so that it can only be moved by the cam spindle.

=901. Crank movement locking bolt,= similar to the last.

=902. Bolt of common lock.=

=903. Disc and pin.=

=904. Side pawl.=

=905. Locking pawl.=

For Pawl and Ratchet Gear see Section 62.

=906. Spring catch,= with round end which slips past the socket if sufficient force is applied, used for swing doors, &c.

=907. Another form,= bevilled on one side.

=908. Hook latch.=

=909 & 910. Hasp and staple.=

=911. Crossbar and hooks.=

=912. Hand set screw.=

=913. Drop catch= for turntable, &c.

=914. Turning or twisting bolt.=

=915. Rope or rod stopper,= with cam lever grip. See No. 47.

=916. Chain stop.=

=917 & 918. Spindle grips,= to lock a sliding or revolving spindle in a bearing or bush.

=919. Clamp and screw.=

=920. Sliding shaft locking pin;= used for lathe headstock back-gear shafts, &c.

=921. Lever locking hook;= the lever is hinged so that it can be slipped over the hook.

=922. Bow catch= for ladles, skips, &c.

=923. Segment-slot and bolt fixing= for swivelling base.

=924. Pin lock= for turntable or disc.

=925. ~T~ catch.=

=926. Roller and incline slot= for locking a rod or rope.

=927. Revolving bush lock= for catch rod; the catch rod can only slip through the bush when the latter is in one position (see plan view).

=928. Wire fencing notches= in ~L~ or ⊔ iron.

=929. Trap door automatic catch.=

=930. Screw and bridle suspension,= for blast pipes, &c.

=931. Drop loop fastening= for a door.

=932. Spring stud lock.=

=933. Disc and radial slot;= the rod can be slipped out sideways when the disc is turned so as to bring the slots together.

=934. Radial hinged lever and crown ratchet.=

=935. Locking bar= to fix a lever in any position.

=936. Pawl for locking sliding shaft,= used for winches, &c., having double and single purchase gear or shifting clutches.

=937. Fastening eye bolt= for a hinged cover; the bolt is also hinged, and can be turned down out of the way. See also No. 1930.

=938. Crank arm device,= to lock a valve or lever in two positions. See also No. 16.

=939. Gun, breech-loading,= sliding cylindrical block locked by turning the arm into a notch.

=940. Door fastening staple and cotter.=

=941. Common cotter.=

=942. Half nut locking and unlocking device,= used for lathe leading screws; the half nuts are moved simultaneously in opposite directions by cams on the lever spindle.

=943. Swinging catch= to secure end of a drop bar.

=944. Tool post,= to swivel and lock in any position. See also No. 493.

=945. Locking screw,= to lock the hand wheel and spur pinion to the shaft when required to be driven by it.

See also Lock Nuts. The common varieties of lever locks with stepped
key-wards.

See No. 1723.