CONNECTING ROD AND CROSS-HEAD.
(J. I. Case Threshing Machine Co.)
The piston rod is of wrought iron or steel, and is fitted firmly and rigidly into the piston at one end. It runs from the piston through one head of the cylinder, passing through a steam-tight “stuffing box.” One end of the piston rod is attached to the cross-head.
The cross-head works between guides, and has shoes above and below. It is practically a joint, necessary in converting straight back and forth motion into rotary. The cross-head itself works straight back and forth, just as the piston does, which is fastened firmly to one end. At the other end is attached the connecting rod, which works on a bearing in the cross-head, called the wrist pin, or cross-head pin.
The connecting rod is wrought iron or steel, working at one end on the bearing known as the wrist pin, and on the other on a bearing called the crank pin.
The crank is a short lever which transmits the power from the connecting rod to the crank shaft. It may also be a disc, called the crank disc.
CROSS-HEAD.
(J. I. Case Threshing Machine Co.)
Let us now return to the steam cylinder itself.