US PATENT SUBCLASS 172 / 645
.~ Tools relatively adjustable horizontally without causing vertical displacement

Current as of: June, 1999
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172 /   HD   EARTH WORKING

613  DF  PLURAL RELATIVELY MOVABLE TOOLS {14}
645.~ Tools relatively adjustable horizontally without causing vertical displacement {7}
646  DF  .~.~> Laterally adjustable tools, independently free to move vertically
647  DF  .~.~> Tools simultaneously adjustable about their individual, spaced vertical axes
648  DF  .~.~> Collapsible lazy tong group
649  DF  .~.~> Tool groups relatively horizontally adjustable {2}
654  DF  .~.~> Main central beam, tools laterally adjustable relative thereto
655  DF  .~.~> Tool adjustable vertically and laterally
656  DF  .~.~> Tool laterally adjustable

DEFINITION

Classification: 172/645

(under subclass 613) Apparatus comprising earth working elements mounted on a support or frame which are capable of being adjustable relative to each other in a horizontal sense, without simultaneously disturbing their position in a vertical sense relative to said support or frame.

(1) Note. For the meaning of "adjustable" see the class definition.

(2) Note. There may be a positive means provided for precluding relative vertical movement of the elements while they are moved horizontally or the elements may simpy be so mounted that they can be relatively moved horizontally without simultaneously causing veritcal displacement of said elements. For example, this definition would include those devices in which loosening of an element securing means permits both a relative vertical and horizontal displacement, since an operator could manually preclude vertical displacement of said elements while moving the same horizontally, relative one to the other. Also, this definition includes tools which are removed from one position and remounted in a horizontally spaced position so long as the tool in its new position can retain the same relative

vertical position. (Also see (2) Note under subclass 613).