Dual motor torque delivering tool

Details Dual motor torque delivering tool Dual motor torque delivering tool

1982-11-18

1985-06-11

Schran, Donald R.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

60424, 81470, 173 1, B23Q 506

Patent

active

045222690

ABSTRACT:
A pneumatic power tool for tightening screw joints includes a primary motor 11 for a high speed running down sequence, a secondary motor 12 for a high torque final tightening sequence, a coupling gearing 18 providing a high ratio gearing for the secondary motor 12, a gearing of a substantially lower ratio for the primary motor 11 and a one-way clutch 30 by which the secondary motor 12 is automatically engaged at decreasing tightening speed. An air supply valve 33 substantially reduces the air consumption of the tool by keeping the air supply to the secondary motor 12 shut off until a certain degree of tightness in the joint is obtained, after which the valve 33 is opened and the secondary motor 12 is energized.

REFERENCES:
patent: 3073123 (1963-01-01), Hodgson et al.
patent: 3507173 (1970-04-01), Wallace
patent: 3529513 (1970-09-01), Amtsberg
patent: 3686983 (1972-08-01), Flagge
patent: 3791458 (1974-02-01), Wallace
patent: 4113080 (1978-09-01), Thackston et al.

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