Air driver device

Abstract

Provide an air driver device which is simple in construction and easily realizable in compact size, and has excellent durability. In an air driver device designed to shut off the supply of compressed air to the air motor 3, by means of a tightening torque control mechanism 6 and a shut-off valve mechanism 7, in case the tightening torque reached the set torque value, and tighten screw members at prescribed tightening force, the tightening torque control mechanism 6 is composed of a clutch unit 61, a driving piston 62 on the back face of which is formed one clutch plate 61a so that the clutch plates 61a, 61b of the clutch unit 61 may move by making rotational differential motions relatively in case the tightening torque reached the set torque value, a cylinder 63 for storing this driving piston 62, a check valve 64 for operating the shut-off valve mechanism 7, in linkage with the driving piston 62 through an oil charged in the cylinder 63, and a torque control member 65 for regulating the set torque value.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front elevation showing an embodiment of the air driver device according to the present invention.

FIG. 2 is a sectional view of above.

FIG. 3 is a partial expanded sectional view of above.

FIG. 4 is a partial expanded sectional view of above.

FIG. 5 (a) is a plan view of the spindle, FIG. 5 (b) is a front elevation, and FIG. 5 (c) is a right side view.

FIG. 6 (a) is a plan view of the driving piston, FIG. 6 (b) is a front elevation, FIG. 6 (c) is a left side view, and FIG. 6 (d) is a right side view.

FIG. 7 (a) is a plan view of the cylinder, FIG. 7 (b) is a front sectional view, FIG. 7 (c) is a left side view, and FIG. 7 (d) is a right side view.

FIG. 8 is an explanatory drawing of the constituent members.

FIG. 9 (a) is a front sectional view of the grip, FIG. 9 (b) is a left side view, and FIG. 9 (c) is a right side view.

FIG. 10 is a sectional view before starting of the air driver device.

FIG. 11 is a sectional view during tightening of the air driver device.

FIG. 12 is a sectional view during a shut-off of the air driver device.

FIG. 13 (a) is a sectional view before starting of a conventional air driver device, and FIG. 13 (b) is a sectional view during a shut-off.

FIG. 14 (a1) and FIG. 14 (a2) are cross-sectional views of FIG. 13 (a), and FIG. 14 (b1) and FIG. 14 (b2) are cross-sectional views of FIG. 13 (b).

Claims

1. An air driver device comprising an air driver, and designed to shut off the supply of compressed air to the air motor, by means of a tightening torque control mechanism and a shut-off valve mechanism, in case the tightening torque reached the set torque value, and tighten screw members at prescribed tightening force, characterized in that the tightening torque control mechanism is composed of:a clutch unit,a driving piston on the back face of which is formed one clutch plate so that the clutch plates of said clutch unit may move by making rotational differential motions relatively in case the tightening torque reached the set torque value,a cylinder for storing the driving piston,a check valve for operating said shut-off valve mechanism, in linkage with said driving piston through an oil charged in the cylinder, anda torque control member for regulating the set torque value.

2. An air driver device as defined in claim 1, on said check valve is disposed an inertial force absorbing piston movably in the axial direction of the check valve, so that the urging force of the spring constituting the torque control member may act, through the inertial force absorbing piston, on the check valve, and enable to temporarily store an oil in the auxiliary cylinder storing the inertial force absorbing piston.