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Buckling Spring Mounting Configuration Without Coil Entrapment of Same

IP.com Disclosure Number: IPCOM000120426D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 28K

Publishing Venue

IBM

Related People

Bellamy, RL: AUTHOR

Abstract

The buckling spring described in U.S. Patent 4,118,611 utilizes an interference fit on the attached end of the mating pivot plate actuator. The most common and inexpensive process to accomplish this is by compressing the spring to its minimum compressed length and attaching it to the pivot plate actuator post. The two inactive coils of the spring become trapped and fixedly anchored to the actuator post causing desired results. On occasions some of the active coils, or portions thereof, become undesirably trapped to the actuator post, changing the assembled height of the spring and consequently the desired "make" and "break" specifications of the spring.

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Buckling Spring Mounting Configuration Without Coil Entrapment of Same

      The buckling spring described in U.S. Patent 4,118,611
utilizes an interference fit on the attached end of the mating pivot
plate actuator.  The most common and inexpensive process to
accomplish this is by compressing the spring to its minimum
compressed length and attaching it to the pivot plate actuator post.
The two inactive coils of the spring become trapped and fixedly
anchored to the actuator post causing desired results.  On occasions
some of the active coils, or portions thereof, become undesirably
trapped to the actuator post, changing the assembled height of the
spring and consequently the desired "make" and "break" specifications
of the spring.

      This concept is improved by the use of a spring with a reduced
diameter for the inactive coils for the pivot plate actuator assembly
used in the buckling spring keyboard. This type of spring would
eliminate the possibility of coil entrapment and its negative impact
on the keyboard performance as the larger diameter active coils have
adequate clearance with the actuator post.