Chapter XV: Section 17: Connecting Rods and Links

=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.

=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.

=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.