Back to results
US 4,541,309 AGranted
Torque wrench
OwnerJerome N. Herrickinventor
Life of this patent
Estimating the term…
Abstract
A power torque wrench operated by pulling a flexible tension element tangentially from a drum which is connected through ratchet means to a coaxial driver and having a second tension element wrapped around the drum in the opposite direction so that the work stroke of the motor winds the second tension element around the drum and the return stroke of the motor winds the first tension element around the drum.
Claims7
A torque wrench comprising:
- a cylindrical spool mounted to rotate on its long axis and including one portion of a ratchet means,
- a ratchet element including a second portion of said ratchet means, mounted in an axial cavity within said cylindrical spool and engaged with said first portion of a ratchet means,
- a driver connected to said ratchet element to be coaxial with said cylindrical spool,
- a handle including a motor capable of reciprocal motion including a work stroke which provides a predetermined force and a return stroke,
- a first flexible tension element wrapped around the cylindrical surface of said spool in a first direction, having one end fixed to said cylindrical surface and the other end fixed to be put in tension by said work stroke,
- a second flexible tension element wrapped around the cylindrical surface of said spool in the direction opposite said first direction, said second tension element having one end fixed to said cylindrical surface and the other end fixed to be put in tension by a return stroke of said motor, and
- the length of said work stroke being limited so that said first tension element is wrapped around said cylindrical spool less than 360.degree..
4 more elements
Dependencies are inferred from the claim text.