Pit′man–head.
The block or enlargement at the end of a pitman, at which point its connection is made to the object by which it is driven or which it drives.
The means are usually a strap, gib, and key, but in certain machinery, as in harvesters, another arrangement is preferred, as in
Fig. 3770, or in the example, in which the wrist revolves in the divided box, which is supported on a screw at the end of the pitman, and a pivot from the opposite side of the oil-cup; a determinate freedom of motion is allowed in a plane coincident with its points of suspension and also transverse thereto.
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Pitman-head. |
Fig. 3772 is another form in which the head of the pitman is connected by swivel-pieces to the parts holding the boxes of the wrist to secure freedom of motion.
In
Fig. 3773, the chilled-box pitman-head has an internal screw to receive the threaded end of the pitman, which is secured by a jam-nut.
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Harvester pitman-head. |
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Wrist-wheel, wrist, and pitman-head. |
