Device for enlarging a chimney
Patent 5096262 Issued on March 17, 1992. Estimated Expiration Date: 
January 12, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 12, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorApplicationNo. 457804 filed on 01/12/1990US Classes:299/55, Rotary cutter head with advance direction coincident or parallel to rotary axis15/104.069, Suspended by a taut member (e.g., wire, rope, chain, etc.)29/81.05, With rotary head241/277, Rotating comminuting surface299/80.1Adjustable headExaminersPrimary: Bagnell, DavidAttorney, Agent or FirmForeign Patent References
International ClassesB08B 009/02B28D 001/18 F23J 003/02 Foreign Application Priority Data1988-03-12 DEAbstractAn apparatus for cross-sectionally enlarging a chimney flue includes a fluid motor; a milling cutter mounted on the fluid motor and being driven thereby for removing constructional wall material from walls defining the flue; a suspension device for supporting the fluid motor and the milling cutter as a unit and for raising and lowering the fluid motor and the milling cutter in the chimney flue; a fluid pressure source; a hose connecting the fluid pressure source with the fluid motor for supplying the fluid motor with pressurized fluid from the fluid pressure source; a guiding device arranged about and travelling with the fluid motor for engaging the flue walls to guide the fluid motor in the flue; and a device for varying a radial position of the guiding device relative to the motor axis.Field of SearchPROCESSESRotary cutter head with advance direction coincident or parallel to rotary axis With percussive-type cutter Hollow-ware cleaners Interior surface With rotary head Combined with non-comminuting means Rotating comminuting surface Elongated edged member Detachably secured to a rotary element | |
