US PATENT SUBCLASS 175 / 293
BELOW-GROUND (1) HAMMER, OR (2) IMPACT MEMBERS

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

293BELOW-GROUND (1) HAMMER, OR (2) IMPACT MEMBERS {7}
294  DF  .~> Combined with safety joint
295  DF  .~> With noncutting portion forwardly of sleeve impact member having a cutting portion (e.g., reamer)
296  DF  .~> Fluid-operated {1}
298  DF  .~> Continuous unidirectional rotary motion of one telescoping member effects consecutive impacts
299  DF  .~> Resiliently biased
300  DF  .~> With releasable means to detachably retain telescoping members against axial reciprocation {3}
305  DF  .~> Telescoping members relatively rotatable {1}

DEFINITION

Classification: 175/293

(under the class definition) Apparatus comprising (1) a reciprocable member positioned below ground adapted to cause a sudden jar shock or hammer below to the boring apparatus or (2) two telescoping members positioned below ground which members are capable of axial reciprocation with respect to each other and are provided with means to limit said reciprocation, the means for limiting reciprocation being for the purpose of causing an impact or hammer blow or jar to the boring apparatus or a portion thereof.

(1) Note. The jarring function must be specifically described for classification in this subclass and not left to inference; mere telescoping tool shaft sections which are not disclosed as for the purpose of impacting or jarring a portion of the apparatus below ground are classified below as indicated by the search notes.

(2) Note. For classification in this subclass the impact or blow must be delivered to a portion of the boring means and not directly to the formation. For example, a below ground device for impacting a bit is classified herein, but a bit which is reciprocated to deliver a blow to the formation is excluded.

(3) Note. Elements such as tubes, rods or balls which are freely dropped into a tool shaft from the surface to actuate a mechanism or close or otherwise modify a passage located in a portion of a tool or tool shaft located below ground are excluded even though such devices may incidentally cause an impact or jar to the apparatus. Such devices are classified on the basis of the individual functions performed.

(4) Note. As detailed in the class definition, C, and Lines With Other Classes and Within This Class, Relationship to Other Classes Which Include Subject Matter Closely Related to Class 175, B, subject matter under this definition includes a below ground lost motion connection, per se, or a below ground lost motion connection combined with a specific joint for connecting the shaft or cable to an art device forming the subject matter for another class. However, inclusion in a claim of specific structure of an art device classified in another class will cause classification in such other class.

SEE OR SEARCH THIS CLASS, SUBCLASS: 135, and the search there noted for above ground means to impact an earth penetrating means.

237, for means movable relative to a tool below ground to stop flow toward the bore bottom, and in which said means comprises a dropped element.

268, 270 and 271, for a cutter element which is shiftable laterally relative to a bit head below ground, and in which the expansion of the cutter element is dependent on a dropped element.

317+, for means movable relative to a tool or shaft to control a below ground passage means and in which the means includes a dropped element.

321+, for axially telescoping tool shaft sections.

414+, for an impact type bit.

SEE OR SEARCH CLASS

166, Wells,

178, for specific well structure classifiable, per se, in Class 166 combined with a jar. However, a jar combined with a packer or guide or a shaft being used in a boring operation is classifiable in Class 175.

173, Tool Driving or Impacting,

90+, and see the search notes therein for an impacting device of general utility for imparting blows to a tool. The mere location of an impacting device below ground in an earth bore does not prevent classification in Class 173 but an impacting

device which is described as located below ground and is described as (1) a lost motion connection in a tool shaft or cable or (2) is claimed in combination with a specific earth boring means such as specific work contacting tool structure, or a packer or guide on a shaft being used in a boring operation is classified in Class 175. 285, Pipe Joints or Couplings,

298+, and the search there noted for pipe joints or couplings having a telescopic or a relative motion connection.

294, Handling: Hand and Hoist-Line Implements,

86.18, for grapples adapted to function in a well combined with a jar or impact means to effect a release of the grapple from engagement with an object in a well bore, and subclass 86.23 for grapples adapted to function in a well bore combined with a jar or impact means of general utility within a well bore or similar earth opening. (Included herein are grapples combined with impact means that function to firmly set the grapple in engagement with an object in a well bore or with impact means that function to drive upwardly to release a grapple engaged object that is stuck within a well bore.)

464, Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts,

18+, for a flexible coupling between fluid conducting rotary shafts; and subclasses 162+ for a drive coupling facilitating relative axial motion between coupled members.