Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Patent
1994-09-01
1995-07-25
Smith, Scott A.
Tool driving or impacting
Automatic control of power operated means
Drive means responsive to torque or speed condition
173 935, 173 93, B23Q 500
Patent
active
054353980
ABSTRACT:
An electrical wrench includes a motor and a drive shaft driven by the motor. A transmission body is mounted on the drive shaft for rotating synchronously therewith and has an accommodating space. A wrench shaft has a follower member extending into the accommodating space. A swing member has an axial positioning protrusion and is pivoted within the accommodating space about an axis offset and parallel to the axis of rotation of the transmission body. The swing member can swing to an engaging position with the follower member to transmit rotation when the transmission body is rotated to a high speed. A shoe assembly is biased to clamp the swing member to disengage the swing member from the follower member and releases the swing member to the engaging position by virtue of the centrifugal force induced at the high speed of the transmission body. The shoe assembly includes a pair of shoes which extend circumferentially on two sides of the swing member and which respectively have one end pivoted within the accommodating space and the other opposite end that can clamp and immobilize the positioning protrusion.
REFERENCES:
patent: 2784819 (1957-03-01), Reynolds
patent: 3605914 (1971-09-01), Kramer
patent: 4583600 (1986-04-01), Smith, III
patent: 4947939 (1990-08-01), Hung
patent: 5379851 (1995-01-01), Huang
Smith Scott A.
Wang Cheng Chiu-Yu
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