US PATENT SUBCLASS 175 / 56 NATURAL VIBRATION CHARACTERISTIC OF AN ELEMENT OF BORING MEANS RELATED (1) TO NATURAL VIBRATION CHARACTERISTIC OF ANOTHER ELEMENT, OR (2) TO FREQUENCY OF AN IMPOSED MOTION
Current as of: June, 1999
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(under the class definition) Process or apparatus comprising a step or means relating to an element or part of the boring means which has a property affecting its natural period of vibration when it is impacted or elastically deformed which bears a relationship to (1) a similar property of another element or part of the boring means or (2) the frequency or period of vibration of the force causing the impacts or deformations of the first element.
(1) Note. The relationship of vibration characteristics must be specifically described but the claims need recite only some feature which has been described as relating to the vibration characteristics for classification in this subclass.
(2) Note. A mere shock absorber, such as a spring or rubber element, is excluded from this subclass unless it is described as having a particular relationship to the vibration characteristics of another part or the imposed motion.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1, for boring devices combined with means to generate or detect seismic shocks.
55, for boring tools actuated by the reaction of a rotating eccentric mass.
SEE OR SEARCH CLASS 166, Wells,
249, for processes for vibrating the earth to fracture the formation and subclasses 177.1+ for apparatus for causing vibrations to fracture the formation.
299, Mining or In Situ Disintegration of Hard Material,
14, for a process of recovering valuable material from the earth or breaking up hard material in situ, including a step of disintegrating by directly applying vibration.
