US PATENT SUBCLASS 175 / 320
WITH TOOL SHAFT DETAIL

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

320WITH TOOL SHAFT DETAIL {4}
321  DF  .~> Axially telescoping shaft section {1}
323  DF  .~> Helix or helically arranged structure
324  DF  .~> Means other than tool structure to induce fluent flow
325.1  DF  .~> Shaft carried guide or protector {3}

DEFINITION

Classification: 175/320

(under the class definition) Apparatus including particulars of a tool shaft.

(1) Note. For the meaning of "tool shaft", see the class definition.

(2) Note. The term detail or particulars is meant to exclude mere nominal or broad recitations of a tool shaft. For example, a shaft having a detailed handle fixed thereto or merely stating "hollow tool shaft", "centrally located passage", "convolute tool shaft", etc, would be insufficient, but if said shaft is described as having a particular kind of passage or convolution or multiple passages, etc., the patent will be classified herein.

(3) Note. For purposes of this subclass, the tool shaft extends between above ground structure and the joint directly above the cutting element that is most closely located to the above ground structure; all structure from the joint above the said cutting element to the most remote bore engaging end of the boring means is considered as part of the tool structure. Likewise, details of the joint structure which are in the tool shaft, but function merely to connect the tool structure to the shaft are excluded as subject material for this subclass, and are classified with the particular tool structure in this class if tool structure is claimed, or in the appropriate joint class if tool structure is not claimed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

74, for sectional shaft having means to lock sections in angular relation in a means to constrain tool to bore along a curved path. 75, for normally curved shaft in a means to constrain tool to bore along a curved path.

101, for positive driving connection between tool and support shaft for rotary below ground prime mover.

173, with drive means including diversely actuated shafts extending into bore.

205, for means providing pressurized gas contact with drilling liquid which may be located in a tool shaft.

215, for tool shaft having plural passages for drilling fluid.

317+, and the search there noted for means movable relative to tool or tool shaft to control below ground passage.

SEE OR SEARCH CLASS

174, Electricity: Conductors and Insulators, appropriate subclasses for electrical conductors and particularly

47, for combined electrical and fluid conductors.