Browse Prior Art Database

Torque Verification System

IP.com Disclosure Number: IPCOM000109567D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 2 page(s) / 81K

Publishing Venue

IBM

Related People

Sawyerr, JA: AUTHOR

Abstract

The article relates to a control system for ensuring that all screws tightened by torque drivers in an assembly operation are torqued correctly and in the correct order. The control system includes means for registering which is the next screw in a sequence of screws to be tightened and only permits operation of the torque driver on the correct screw.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 70% of the total text.

Torque Verification System

       The article relates to a control system for ensuring that
all screws tightened by torque drivers in an assembly operation are
torqued correctly and in the correct order.  The control system
includes means for registering which is the next screw in a sequence
of screws to be tightened and only permits operation of the torque
driver on the correct screw.

      The described system was developed as a solution to loose
end-cover screws on a disk file.  It is also applicable in the
manufacture of other products where quality and reliability of
screwing operations is important.

      Referring to the block diagram, the physical position of the
torque-driver bit is detected (A) and fed to the control system (B).
The torque driver equipment (C) has an output signal pulse to
indicate when each screw has been torqued correctly.  This signal is
also fed to the control system (B).  The control system has a means
of registering which is the next or 'target' screw to be tightened,
i.e., a counter.  This counter is only incremented when all of the
following conditions are met simultaneously:
  1.  The torque driver bit is located on the target screw.
  2.  The torque driver (D) operates and applies its specified torque
to the screw.

      To prevent screws being tightened out of sequence, the torque
driver(s) can only operate when located to the target screw.

      When all screws have been tightened, the system resets it...