JPS6445580A - Air screw driver - Google Patents

Abstract

PURPOSE: To mechanically remove a screw from a band while utilizing the driving force of an air motor so as to thread into a work material by arranging a motor portion of an air motor in a cylinder freely to be moved in the vertical direction. CONSTITUTION: A trigger 11 is pulled so that a valve 16 takes the compressed air inside of an air reservoir chamber 14 through an intake hole 38 provided over a motor portion 20 of an air motor 18, and the air motor 18 is driven so as to rotate a bit 1 through a reduction gear 19, and the air is discharged to the atmospheric air through an air discharge hole 39. At the same time, an intake passage 13 is connected to a discharge passage 15, and the air inside of a valve chamber 47 is opened to the atmospheric air, and a head valve 42 is pushed upward by the compressed air pressure inside of the air reservoir chamber 46. Communication of the inside of a cylinder 26 provided with a built-in motor portion 20 with the atmospheric air is shut off, and the compressed air inside of each air reservoir chamber 46, 14 is supplied into the cylinder 26, and the motor portion 20 is pushed down through a steel ball 41. As a result, the bit is lowered while it is rotated, and a tip thereof is engaged with a cross hole provided in a head of a screw 3 so as to remove the screw 3 from the band 9, and the screw 3 is threaded into an wood material 7 and a steel plate 10.