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A still further object of the invention is to provide a generally new mode of mounting and of actuating the commutator brushes. In other words, the vibrator shown herein "becomes in a sense a pendulum swinging about a center approximately at the area occupied by the commutator and the brush ring. Trade catalogs Catalogs Document Type: The bearing plates 32 and 35, spacer sleeve 34 and field assembly 24 occupy an interconnected relatively stationary relation to one another by virtue of longitudinal bolts 37 which extend from the bearing plate 25 downward through the sleeve 34 and field assembly 24 to the bearing plate Brushes 'ldand 47 are in respective holders 44 and 45 and are urged by respective springs 48 and 49 toward the center-area of the disc where they engage and ride on the surface of the commutator The ability to use the present vibrator unit connected to either a standard 60 cycle single phase A.

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Add a review and share your thoughts with other readers. Brushes 'ldand 47 are in respective holders 44 and 45 and are urged by respective springs 48 and 49 toward the center-area of the disc where they engage and ride on the surface of the commutator While there have been vibrators heretofore used which produce high frequency vibration of the concrete, such vibrators required special power supply units which produced high frequency A. Projecting upwardly from the body of part 54 is a tubular projection 56, to which is connected one end of the cable 11 and over which a strain relief spring 57 is fitted. The upper end of the device 10, or that end receiving the cable 11, is closed by a member 54 welded to'the top of housing 15, as at " By this is meant the frequency of the A.