(under the class definition) Apparatus comprising positioning means attached to and projecting laterally beyond (1) a tool; (2) a fluid moving structure; or (3) a fluid conveying means (i.e., tubing) to centralize within the well the tool, fluid moving structure, or fluid conveying means.
(1) Note. Included are centralizing means that press against the inner wall of the conduit to form a stationary point of reference for manipulation of the well device, but may be moved longitudinally with respect to the well if enough force is applied.
(2) Note. Included in this subclass are devices for centrally positioning a casing during a cementing operation.
(3) Note. Included in this subclass are discreet guides for either connecting (1) two spaced well devices or fluid conveying portions, or (2) terminating either the device or fluid conveying means, and which require the well device or fluid conveying means to be fabricated for the purpose of holding the guide.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138+, for a friction drag combined with a packer or plug and an expansible anchor.
153+, for pistons propelled by fluid in a well conduit.
166, for receptacles with centering devices engaging the wall of a well conduit to operate a valve. 170+, especially 172, for centering devices combined with scraping or brushing means.
179+, for packers or plugs.
206+, for an anchoring device which is jammed against the wall of a surrounding conduit or interlock therewith, especially subclasses 210 and 216 for anchoring devices with wedges and friction drags and subclass 213 for anchors similar to centering devices, but jammed against the surrounding conduit wall.
332.1+, for valves in combination with friction devices engaging a well conduit.
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth,
325.1+, for earth boring apparatus having bore wall engaging means carried on the tool or tool shaft, particularly subclass 325.3 for bearings.
384, Bearings,
29+, for a cylindrical linear bearing of general use; if bore hole contacting structure is disclosed or claimed, placement is in Class 175, subclasses 325.1+.
