Double direction actuating type tool of loose forward and loose backward assisting style
First Claim
1. Apparatus, comprising:
- a bi-directional hand tool operable in a forward direction and a reverse direction, at high and low torques;
means including an auxiliary motor for providing a power assist during manual operation of said hand tool in both said forward and reverse directions, but only at low torques, said motor being arranged to shut-off during manual operation of the tool at high torques so that high torque operation of the hand tool is carried out without a power assist;
means including a battery for providing power to said motor;
forward/reverse switch means for switching between operation of said hand tool in said forward and reverse directions, and means for causing said motor to operate in said forward and reverse directions depending on a status of said forward/reverse switch means; and
torque detection means for detecting a torque on said motor and for automatically cutting-off said power to said motor when said torque exceeds a low torque limit.
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Accused Products
Abstract
A bi-directionally actuated hand tool provides a power assist during loose forward and loose backward (low torque) operation. The subject tool can be used in conventional mechanisms such as a sleeving spanner, gear wrench, mobile wrench, screwdriver, hoist, power puller, or crane, using only a light torque auxiliary motor drive, power cells, and relevant operation switches to provide a power assist for the purpose of speeding-up low torque operations while permitting manually application of high torques. The operation switches of the auxiliary drive may be synchronized with the switch that normally controls tool direction, and the value of the torque output by the auxiliary motor drive can be limited by either a mechanical or electrical torque detector to cut-off automatically whenever the torque is exceeded.
45 Citations
6 Claims
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1. Apparatus, comprising:
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a bi-directional hand tool operable in a forward direction and a reverse direction, at high and low torques; means including an auxiliary motor for providing a power assist during manual operation of said hand tool in both said forward and reverse directions, but only at low torques, said motor being arranged to shut-off during manual operation of the tool at high torques so that high torque operation of the hand tool is carried out without a power assist; means including a battery for providing power to said motor; forward/reverse switch means for switching between operation of said hand tool in said forward and reverse directions, and means for causing said motor to operate in said forward and reverse directions depending on a status of said forward/reverse switch means; and torque detection means for detecting a torque on said motor and for automatically cutting-off said power to said motor when said torque exceeds a low torque limit. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification