A-A-50539
June 22, 1992
COMMERCIAL ITEM DESCRIPTION
VIBRATORS, CONCRETE, ELECTRIC-MOTOR-DRIVEN
The General Services Administration has authorized the use of this
Commercial Item Description as a replacement for Military Specification
MIL-V-21731D, which is cancelled.
Abstract. This document covers commercial, lightweight, portable, double
insulated, electric-motor-driven concrete vibrators. The vibrators covered by
this commercial item description are intended for use in consolidating low
slump, portland cement concrete. This commercial item description covers two
types and two classes of vibrators as follows:
Type I - Flexible shaft connected
Style A - Swivel based motor
Style B - Hand-carried motor
Type II - Motor in head
Salient Characteristics. The vibrator shall consist essentially of a sealed
vibrating head connected to a double-insulated electric motor by a flexible
shaft. Type I vibrator shall be comprised of a sealed vibrating head with an
integral double-insulated electric motor and a watertight hose encasing
electrical cables. Type I, style A and B vibrators shall be furnished with
quick disconnect type couplings to disconnect the flexible shaft from the
electric motor. Type I vibrators shall be equipped with double-insulated
electric motors designed for intermittent duty and to operate in an ambient
temperature of 40 degrees Centigrade. Style B vibrator shall be furnished with
an open, fan cooled splash proof, series wound, double insulated motor. A
flexible, steel wire shaft shall be used to transfer mechanical power from the
motor drive shaft to the eccentric rotor in the vibrating head. Type II
vibrator shall have the electric motor incorporated within the vibrating head.
Source: https://assist.dla.mil
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