Chapter XXXIX: Section 46: JOURNALS, BEARINGS, PIVOTS, &c

See also Section 70.

=808. Plain or solid pedestal.=

=809. Half bearing,= sometimes used without a cotter.

=810. Half bushed bearing,= having a half brass on the lower side only.

=811. Chambered long bearing.=

=812. The ordinary double brassed pedestal= or plummer block; sometimes made with the cap and joint of brasses at an angle of 45° when the shaft is subject to horizontal thrust. Numerous modifications of this bearing exist.

=813. Slot bearing= for rising and falling spindle.

=814 & 815. End thrust bearings.=

=816. Sliding bearing,= with vertical or horizontal traverse.

=817. Double ~V~ bearing= to accommodate different sizes of shafts.

=818. Vertical shaft footstep.=

=819. Vertical pivot.=

=820. Horizontal pivot= and set screw; the screw should have a lock nut to prevent it being worked back by the motion of the spindle.

=821. Conical neck,= usually with steel bush.

=822. Spherical footstep,= to allow the shaft to sway out of the perpendicular.

=823. Horizontal bearing,= allowing the shaft to run out of line.

=824. Balanced bearing,= to bear the weight of a light shaft, and placed between the fixed bearings.

=825. Self-adjusting bearing= for line shafts, with ball and socket movement.

=826. Ball and socket bearing= for vertical spindle, allowing considerable variation from a right line.

=827. Horizontal thrust bearing,= with multiple flanges and double brasses, each capable of separate adjustment; used for screw shafts in steam-ships.

=828. A form of pedestal,= with the cap provided with end joggles to prevent looseness.

=829. Trunnion bearing,= for oscillating cylinders, &c. The steam is conveyed through the bearing, which has a stuffing box and gland to prevent leakage.

=830 & 832. Swinging support= for a shaft, having a sliding bevil gear or other motion upon it which has to pass the swinging support; used for lathe sliding gear, overhead travellers, &c.

=831. Ball and socket centre= for car bogies, &c.

=833. Pedestal with side adjustment= for the brasses by taper keys and screw adjustments.

Bearings running under water are generally lined with strips of lignum
vitæ and require no lubricant.

So-called self-lubricator bearings are in use, lined with strips of
patent composition metal.

=834. Centre bearing,= with annular grip, for a heavy centre piece or car bogie.

=835. Centre bearing,= with allowance for some amount of oscillation.

=Coupled bearings.= No. 671.