Pulverizing and grinding hammer
Patent 5465912 Issued on November 14, 1995. Estimated Expiration Date: 
March 11, 2014. 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.
March 11, 2014. 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 ReferencesInventorsAssigneeApplicationNo. 212590 filed on 03/11/1994US Classes:241/27, Subjecting material to impact by moving comminuting surface241/194, Striking member pivoted to rotor241/197, With attached wear member241/291Comminuting elementsExaminersPrimary: Husar, John M.Attorney, Agent or FirmForeign Patent References
International ClassesB02C 013/04B02C 013/28 AbstractAn improved pulverizing and grinding hammer and methods of making and using such a hammer in a hammer mill are disclosed. The improved hammer has a substantially trapezoidal insert made of a hard metal such as STELLITE 12 that is brazed onto a groove in a conventional hammer to form a contact face having an approximately ten degree layback angle with the vertical. The improved hammer provides a clear visible boundary between the insert material and base metal of the hammer, which acts as a wear indicator when the layback angle wears to approximately 40 to 50 degrees, the critical angle at which the size reduction efficiency of the mill decreases. | |
