US PATENT SUBCLASS 212 / 280
.~ Boom movement stops responsive to overtravel or proximity to powerline

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


212 /   HD   TRAVERSING HOISTS

276  DF  HAVING RANDOM CONDITION SENSOR COMBINED WITH AN INDICATOR OR ALARM OR CONTROLLING MEANS OR DISABLING MEANS {5}
280.~ Boom movement stops responsive to overtravel or proximity to powerline

DEFINITION

Classification: 212/280

Boom movement stops responsive to overtravel or proximity to powerline:

(under subclass 276) Subject matter wherein stopping or disabling occurs in response to either (a) the pivotal movement or telescopic extension of a boom* beyond a predetermined limit or (b) the electromagnetic field of an adjacent electrical power transmission wire.

SEE OR SEARCH CLASS

192, Clutches and Power-Stop Control,

139+, for a stop mechanism (residual or of general application) in which the drive of a machine is discontinued at the limit of travel.

324, Electricity: Measuring and Testing, appropriate subclasses for a magnetic or electric field sensor, per se.