Browse Prior Art Database

Hardwired Jumper Key/Keylock

IP.com Disclosure Number: IPCOM000114439D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Allen, SD: AUTHOR [+3]

Abstract

Disclosed is a hardwired jumper key/keylock containing multiple encoded combinations to limit access to data processing equipment. Use of this invention is less expensive than mechanical keylocks, and eliminates rotary motions that are inappropriate for operators with limited mobility or reduced dexterity.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 64% of the total text.

Hardwired Jumper Key/Keylock

      Disclosed is a hardwired jumper key/keylock containing multiple
encoded combinations to limit access to data processing equipment.
Use of this invention is less expensive than mechanical keylocks, and
eliminates rotary motions that are inappropriate for operators with
limited mobility or reduced dexterity.

      The key is comprised of the key housing itself with a hardwired
jumper code in it and the mating lock receptacle (socket and
hardware) which reads the key for the proper code.  There would be
three or more pins or contact points depending on the level of
security desired.  The more pins available the greater the number of
distinct codes possible.  The minimum number of codes possible with N
number of pins would be 2**(N-1) - 1.

      The key codes are created by connecting a combination of pins
together or connecting them to a common pin.  Pull-up or Pull-down
resistors are used on the keylock receptacle to pull the lines to an
inactive logic state.  When a key is inserted the pins which have
continuity will cause the lines to change logic state.  The
controlling device will read the binary inputs and determine if a
valid key had been inserted.

      Any combination or number of pins may be tied together and not
just in pairs as shown in the example.  The value of the pull-up and
pull-down resistors are selected based on the number of pins which
will be tied together.

      Another implementation is t...