Browse Prior Art Database

Flex Cable Guide

IP.com Disclosure Number: IPCOM000100527D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Siverling, MM: AUTHOR

Abstract

A cable guide structure is designed to contain the flex cable between two cable guides which are concentric with the actuator's center of rotation. The flex cable which is of constant cross section is thus maintained in a constant bending radius over the total rotational travel of the actuator and so its potential energy is essentially held constant. The flex tape provides no rotational force unless a change in the potential energy of the spring force would be experienced by rotating one direction or the other. The fact that the flex tape's point of contact to the outer concentric has a greater angular velocity than the point of contact to the inner concentric during rotation does not diminish the structure's operation and merit.

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Flex Cable Guide

       A cable guide structure is designed to contain the flex
cable between two cable guides which are concentric with the
actuator's center of rotation.  The flex cable which is of constant
cross section is thus maintained in a constant bending radius over
the total rotational travel of the actuator and so its potential
energy is essentially held constant.  The flex tape provides no
rotational force unless a change in the potential energy of the
spring force would be experienced by rotating one direction or the
other.  The fact that the flex tape's point of contact to the outer
concentric has a greater angular velocity than the point of contact
to the inner concentric during rotation does not diminish the
structure's operation and merit.  A variation of the structure is to
design the flex cable with other than constant cross section so that
a prescribed rotational force as a function of actuator position may
be realized.  A second variation is to provide a sudden change in the
shape of the concentric cable guides so as to allow the radius of the
flex tape bending to increase at that actuator position and thus
provide for a detent in that actuator position.

      The dotted image shown in the figure is provided to depict
movement of the actuator.  Note that the loop of the flex tape in the
displaced position (dotted lines) has the same radius of bend
creating spring tension as it did in the undisplaced position (solid
lines).  The tension...