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US 7,069,816 B1Granted
Motor-driven screw driver
AssigneeJohannes Luebbering AG
InventorsKonstanze Saathoff, Achim Lübbering
Life of this patent
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Abstract
The invention relates to a motor-driven screw driver comprising a drive motor to which a first torque limiter is assigned and a head (1) which presents the screw-driving tool or a recess for a screw-driving tool. A ratchet mechanism (6) and a torque limiter (5) assigned to said ratchet mechanism (6) are positioned in the head (1) in such a way that the screw driver forms a manually actuated torque wrench whose torque is defined by the torque limiter (5).
Claims20
Motor-driven manual wrench comprising:
- a driving motor;
- a head having an output tool shaft for coupling to a driving tool;
- a ratchet drive located in the head;
- a first torque limiter coupled to the ratchet drive;
- a second torque limiter coupled to the drive motor such that the wrench forms a manually operable torque wrench whose transmittable torque is determined by the first torque limiter;
- and
- a handle, coupled to said head, being structured and arranged to manually drive the ratchet drive and structured to house the driving motor.
4 more elements
A torque wrench comprising,
- a ratchet drive;
- a motor drive;
- a shaft arranged to be driven by said ratchet drive and said motor drive;
- a handle structured to house the motor drive;
- and
- a first torque limiter coupled to said ratchet drive and a second torque limiter coupled to said motor drive, wherein a torque limit of said first torque limiter is set to be greater than a torque limit of said second torque limiter.
3 more elements
Dependencies are inferred from the claim text.