=295. Turned and finished link= without any adjustments; ends may be
solid, or forked as No. 297.
=296. Flat link= of similar description, with raised bosses for facing
and wear.
=297. Adjustable link,= with right and left hand screw coupling. Lock
nuts may be added to prevent the coupling working back.
=298. Strap link,= fitted with brasses, gibs and cotters, and distance
bar. In this link the wear of brasses is all taken up one way by the gib
and cotter; therefore, if great accuracy in the distance apart of
centres is necessary, gibs and cutters should be fitted at both sides of
one pair of brasses, or No. 299 adopted.
=299. Turned link= with adjustable end brasses. The forked end should be
used where there is the greatest amount of wear.
=300. Wood connecting- or pump-rod= with wrought-iron strap ends, fitted
with brasses, gibs, and cotters. Much used on mining pumps.
The shafts or rods are sometimes of cast iron of cross or ~T~ section,
but are usually of a circular or flat section and swelled in the
middle, similar to No. 299. See Struts and Ties, Section 102.
=301. The most usual form of shifting link= for link-reversing gear,
generally got up bright all over.
[Illustration: 288.-301.]
=302. Similar link,= but having the point of suspension on a side pin,
fixed by screws to the link, and raised from it sufficiently to allow
the sliding block and pin to pass under it.
=303. Reversed curve link.=
=304. Solid bar link,= sometimes adopted for cheapness and simplicity,
the valve rod and eccentric rods having of course forked ends.
=305. Double bar link.= This is also a simple and cheap construction;
the bars are plain, the rod ends single, and the block turned large
enough to have a recess on each side to fit the links.
=306. Strap head connecting rod end,= with square brasses, double gibs
and cotter.
=307. Strap head connecting rod end,= but with rounded end and set screw
fastening for cotter.
=308. Similar to the last,= but with screw cotter adjusting device for
the brasses.
=309. Solid end rod.= The brasses take out sideways.
=310. Forked end rod.=
=311. Strap end for heavy rods,= having cotter for tightening the strap
to the ~V~’s in the rod end. The oil cup is often forged and turned
solid on the strap, as shown.
=312. Rod end with side strap.= The brasses take out transversely by
taking off the side strap.
=313. Solid end= and double set screw fastening for cotter.
=314 & 315. Solid ends for small rods.= The brasses are usually secured
by a set screw.
=316. Solid end,= split with screw bolt tightening device; may be hinged
as shown by dotted line.
[Illustration: 302.-316.]
=317. Covered solid end= for crank pins, with screw adjustments for
brasses.
=318. Common forked rod end,= with cap.
=319. Hook bolt attachment= for gudgeon; sometimes useful where there is
thrust only on the gudgeon.
=320. Double connecting rod,= in which the rods form also distance rods
and bolts for the heads, which are in halves and fitted with brasses of
the ordinary type.
=321. Marine type= of rod end, having solid end, square brasses and cap.
=322. Marine head,= in which the brasses are extended to form the
central block in halves, the rod end being of ~T~ shape and bolted
through the brasses and cap.
=323 & 324. Plain links.=
There are innumerable varieties of the illustrated types of heads in
use, every engineer having his own design.