US 4,334,217 AGranted

Electronic control indicator for cable hoist equipment

AssigneeRig Electronics Ltd.

InventorsBarry J. Nield, Roy R. Earnshaw

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Abstract

A magnetic pick-up device or other electrical output type sensor is operatively situated adjacent to a rotary part of the cable hoist assembly and produces impulses as the part rotates. These are conveyed to electronic equipment which, by use of the necessary calculator networks and the like, displays information such as upper and lower limits or positions of the cable hook and may include automatic cut-off devices for the hoist equipment. Also available is a display showing the total distance travelled by the cable both upwardly and downwardly and means to indicate when a predetermined distance has been travelled. Electronic equipment can also indicate the distance the load travels so that the operator can determine the location of the load relative to a reference point. Furthermore, the rate of travel of the cable as it applies to the penetration of a drill bit can be indicated.

Claims13

Dependent claims

Indicating means for cable hoist equipment which includes a cable with load carrying means on the free end thereof movable between an uppermost position and a lowermost position and vice versa and at least one rotating member which rotates in relation to the vertical movement of the load carrying means;

comprising in combination a pair of sensors secured in spaced angular relationship with one another adjacent said rotating member, sensor actuating means co-axially mounted on said rotating member and being sensed by said sensors and producing electromagnetic pulses therein, and electronic means operatively connected to said sensors to receive the pulses therefrom, said electronic means including means to receive said pulses, first means to translate said pulses and display same to indicate the total distance up and down travelled by the cable and second means to translate said pulses to indicate the position of the load carrying means relative to a reference point such as the uppermost and lowermost positions.

Dependencies are inferred from the claim text.