Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-05-02
1982-06-08
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
33136, 175 45, 212153, 235 92MP, 340686, B66B 302, E21B 4500, G06B 302, G08B 1900
Patent
active
043342175
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.
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Earnshaw Roy R.
Nield Barry J.
Caldwell Sr. John W.
Nowicki Joseph E.
Rig Electronics Ltd.
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