Screw tightening power tool

Details Screw tightening power tool Screw tightening power tool

1990-03-26

1992-07-14

Watts, Douglas D.

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

192150, 81470, 81474, B25B 2314

Patent

active

051294656

ABSTRACT:
A screw tightening power tool, comprising a rotation motor, a power supply (27) connected to the motor, an output shaft (13), a torque responsive release clutch (14) including a driving half (16) and a driven half (17) and coupling the motor to the output shaft (13), an activating rod (26) coupled to the power supply (27), a latch means (24) associated with one of the clutch halves (16) and cooperating with the activating rod (26), and a cam (30) associated with the other of the clutch halves (17) and operatively connected to the latch (24) for making the latch shift from an activating rod (26) supporting position to an activating rod (26) releasing position as the transferred torque has reached the actual preset release torque level of the clutch. The cam (30) comprises a spindle (30) which is rotatively supported relative to the driven clutch half (17) for a limited rotational movement relative thereto.

REFERENCES:
patent: 3195704 (1965-07-01), Linsker
patent: 3237742 (1966-03-01), Ulbing
patent: 3515251 (1970-06-01), Clapp
patent: 3766990 (1973-10-01), Eckman et al.
patent: 4071092 (1978-01-01), Wallace
patent: 4154308 (1979-05-01), Goldsberry et al.
patent: 4191282 (1980-03-01), Schoeps
patent: 4429775 (1984-02-01), Teramoto

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