PISTON-ROD GUIDES.
=672. Two bars and crosshead;= these must be far enough apart to allow
for the angle of the connecting rod.
=673. Four bars, crosshead, and slide blocks;= the connecting rod
working between the two pairs of guides. The bottom guides are often
cast solid with the bedplate.
=674. Bar and slipper.=
=675. Adjustable slipper;= there are other adjustments for wear by wedge
pieces, similar to No. 19. See also No. 21.
A plain guide bush is sometimes used as No. 682, and a forked
connecting rod with long fork coupled to the gudgeon or crosshead.
=676. Section of No. 673 and alternative crosshead= for two round bar
guides.
=677. Slide bed and slipper.=
=678. Section of trunk guide,= cast with engine bed and bored out.
=679. Oscillating cylinder piston head guides.=
=680. Oscillating fulcrum= in lieu of guides.
=681. Diagonal crosshead and guide bars,= to allow the crank and
connecting rod end to pass the guide bars.
VALVE ROD GUIDES.
=682, 683, 684, & 685.=
GUIDE ROLLERS.
=686 & 687. Guide rollers= for ropes, &c.
=688 & 689. Guide rollers= for bars of various sections.
LIFT AND HOIST GUIDES.
=690. Cage guided by four corner posts.=
=691 & 692. Cage runs on two vertical rails,= and is steadied by a third
guide. For large cages. Small cages only require guides on one side, as
692.
[Illustration: 671.-692.]
=693. Iron wire or rod guides,= strained tight, are sometimes used,
especially in mines, as guides for the cage; two are used to guide the
cage and two for the balance weight.
=694. Planished round iron guides,= with half round fixing brackets and
runners attached to cage; these guides are equal to planed bars and much
less costly; two are usually sufficient for any cage.
=695. ~T~ ~L~ or ⊔ iron guides,= for goods lifts.
=696. Wire rope guides,= with separate pair of wood guides for balance
weight.
=697. Intermediate guides= for double cage lifts; for large cages extra
guides at each side should be used.
=698. Sloping carriage guides.=
=699. Vertical bracket cage guides.=
MACHINE GUIDE BEDS.
=700. Double ~V~ bed,= with set screw adjustments.
=701. Guide bed= for planing machine, or any machine where the bed is
not liable to lift in working.
=702. Round bar and flat guide bed.=
=703. Deep ~V~ guide;= much used for crossheads, tool boxes, &c.,
requiring accurate movement.
=704. Lathe bed= with square guides and adjustments for wear.
=705. Planing machine,= double ~V~ bed.
=706. Crosshead= for two single bar guides, with renewable wearing
strips and square guide surfaces.
=707. Radial slide= for tool box, usually of same section as No. 700.
ROPE GUIDES.
708, 709, & 710; in 709 the rope can be threaded without passing the
end through.