US PATENT SUBCLASS 254 / 231
.~ Including screw drive

Current as of: June, 1999
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254 /   HD   IMPLEMENTS OR APPARATUS FOR APPLYING PUSHING OR PULLING FORCE

199  DF  PORTABLE IMPLEMENTS OR APPARATUS FOR TENSIONING FLEXIBLE MATERIAL OR FOR EXTRACTING STUMPS OR POLES {12}
231.~ Including screw drive {4}
232  DF  .~.~> Plural screws {1}
234  DF  .~.~> Having plural, oppositely shifting, threaded riders
235  DF  .~.~> Having ratchet wheel and pawl for driving screw
236  DF  .~.~> Having intermeshing gears for driving screw

DEFINITION

Classification: 254/231

Including screw drive:

(under subclass 199) Implements or apparatus wherein the portion of the implement or apparatus adapted to contact the

flexible member or article is moved by driving structure including a threaded, cylindrical rod which either (a) rotates to move a cooperating threaded rider along its longitudinal axis or (b) is axially shifted by, and relative to, a cooperating, rotating, force transmitting threaded element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

20, 85, 92, 98+, and 204, for implements or apparatus including a screw drive.