PURPOSE: To render water flow adjustment conformable by installing a manually- operable adjustment unit, and altering the cross-sectional surface of a nozzle at the just front of a water spout at a constant jetting velocity of the nozzle.
CONSTITUTION: During operation, water supply is carried out at a full open state with respect to an ordinary water supply angle nipple, a groove ring is put at a half-opened position, i.e., at a half-opened position of a water nozzle 28, and a position 50 of an adjustment device 40 is put a neutral position. Following this, by permitting a handle 41 of the adjustment device 40 to turn so that the water nozzle 28 is closed and the piston 50 is moved to the left, oil is force- fed from a cylinder chamber 56 to the chamber 72 of a gun part; thus allowing the groove ring moving along with a piston part 74 by liquid pressure of oil to close the water nozzle successively. This can create a suitable mixture of water and concrete.
RUDORUFU MATEISU
GERUTO KURAINATSUKE
