Browse Prior Art Database

Torque Reaction Arm

IP.com Disclosure Number: IPCOM000107456D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 1 page(s) / 50K

Publishing Venue

IBM

Related People

Kent, JW: AUTHOR [+2]

Abstract

Described here is a torque reaction arm comprising a series of telescoping rods which is used to retain and control an air driver which installs and torques screws in an assembly operation. In doing so, the arm eliminates the transfer of torque to the operator's wrist.

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Torque Reaction Arm

      Described here is a torque reaction arm comprising a series of
telescoping rods which is used to retain and control an air driver
which installs and torques screws in an assembly operation.  In doing
so, the arm eliminates the transfer of torque to the operator's
wrist.

      At some build stations where machines are assembled with
screws, the screws are driven with air drivers, turning at the rate
of 1750 RPMs, with torque up to 16 inch pounds. The number of screws
can vary from model to model, but, for example, average 10 per unit.
If operators build 10 to 12 per hour, the operator's wrist must
absorb a minimum of 800 shocks per day.  Accordingly, wrist injuries
can occur. This type of wrist injury is commonly known as carpal
tunnel syndrome.  The definition of carpal tunnel syndrome is:  "A
complex of symptoms resulting from compression of the median nerve in
the carpal tunnel with pain and burning or tingling (in fingers and
hand, sometimes to elbow)".  (See Dorland Illustrated Medical
Dictionary, twenty six Edition.)

      The torque reaction arm disclosed herein is shown in the
figure.  It will absorb from 0 to 100 inch pound of torque,
transferring none to the wrist.  The design can be modified for use
with higher torque hand tools as needed.

      Disclosed anonymously.