vibrating grizzlies

vibrating grizzlies

[′vī‚brād·iŋ ′griz·lēz]
(mechanical engineering)
Bar grizzlies mounted on eccentrics so that the entire assembly is given a forward and backward movement at a speed of some 100 strokes a minute.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.