Chapter XXIX: Section 36: Expanding and Contracting Devices

Common expedients for these purposes are--jointed folding rods, as a carpenter’s rule; the telescope tube; net work; diagonally crossed and jointed bars; lattice work; springs (see Section 80); lazy tongs (No. 623).

=616. Telescopic ram hydraulic lift.= (See also No. 1217.) Consisting of two or more rams sliding within each other.

=617. Parallel bar expanding grille,= or gate.

=618. Parallel bar expanding grille,= with lazy tongs motion, each alternate bar has slotted holes as shown.

=619. Modification of 618.= The number of horizontal bars can be multiplied indefinitely.

=620. Venetian blind;= this method is used also for movable doors or partitions, sliding horizontally.

=621. Venetian blind,= but without revolving motion to the laths or slats.

=622. Perforated bar and hooked rod suspender.=

=623. Lazy tongs expanding connecting rod.=

=624. Four-guide expanding link device,= for varying motion.

=625. Thorburn’s tube expander,= operated by a central cone and ring of conical rollers.

=626. Gasometer.=

=627. Timms’ expanding boring tool.= Operated by a central cone and three or more diagonal feathers, sliding in dovetail grooves in the central cone.

Expanding Mandrel, No. 507.

Expanding Chucks, Nos. 489, 491, & 506.

=628. Expanding basket,= with chain corner suspenders.

=629. Expanding socket,= with sliding ring grip.

=630. Expanding grating,= formed of bent steel laths on edge.

=631. Bridge or flap= between cars, having buffers.

=632. Expanding core barrel,= in three parts, expanded by a wedge.

=633. Expanding mandril or chuck.= See also Section 28.

Expansion Joint, Nos. 1076, 1077.

Expanding Pipes, No. 1079.