Carl William Graf

US Patent:

39319377, Jan 13, 1976

Filed:

Nov 19, 1973

Appl. No.:

5/417335

Inventors:

William F. Hahn - Devon PA
Carl R. Graf - Whitehall PA
George H. Hart - Newcastle ME

Assignee:

Pennsylvania Crusher Corporation - Broomall PA

International Classification:

B02C 1306

US Classification:

241 74

Abstract:

A rotor-equipped breaker/crusher drum for coal and other material in which means are provided for rotating the drum at close to critical speed, and in which lifter shelves in the drum are adjusted for dropping material into the path of the rotor at a point where the rotor not only fragments the material, but also emphasizes the flinging of the material against the downwardly moving perforated wall of the drum. Apparatus of this character enable a relatively small breaker/crusher to effectively duplicate the performance of much larger existing units, while successfully controlling the production of fines.

US Patent:

50626019, Nov 5, 1991

Filed:

Aug 28, 1990

Appl. No.:

7/573696

Inventors:

Carl R. Graf - King of Prussia PA

Assignee:

Pennsylvania Crusher Corporation - Broomall PA

International Classification:

B02C 1718

US Classification:

241 793

Abstract:

Apparatus for reducing and sizing particle material that is readily susceptible to efficiency enhancement with vibratory exciters. The apparatus includes a rotary drum particle size reductino device having a substantially imperforate drum, and a rotary screen having a perforate screening member with upstream and downstream portions, said upstream portion of the screen surrounding at least a portion of the periphery of the drum. A screen supporting member including a vibratory exciter engages an upstream portion of the screen for vibrating said upstream portion substantially independently of the drum.

US Patent:

50765078, Dec 31, 1991

Filed:

Dec 21, 1989

Appl. No.:

7/452825

Inventors:

Carl R. Graf - King of Prussia PA

Assignee:

Pennsylvania Crusher Corporation - Broomall PA

International Classification:

B02C 1720

US Classification:

241184

Abstract:

A grinding mill having a rotatable grinding chamber within which is a body of elongate grinding members that have a longitudinal axis substantially longer than the maximum transverse dimension thereof. The mill is arranged in such a way as to retaining the grinding member axes substantially parallel to the grinding chamber rotational axis. The grinding members have a cross-sectional shape and a sufficient exterior surface smoothness for enabling a body of such members to tumble over and against one another in a rotating grinding chamber and to grind particulate material within the body, as well as a ratio of mass per unit of length which varies from one position to another along the length of the longitudinal axis.

US Patent:

40098346, Mar 1, 1977

Filed:

Oct 28, 1975

Appl. No.:

5/626600

Inventors:

William F. Hahn - Devon PA
Carl R. Graf - Whitehall PA
George H. Hart - New Castle ME

Assignee:

Pennsylvania Crusher Corporation - Broomall PA

International Classification:

B02C 1306

US Classification:

241 27

Abstract:

A method of operating a rotor-equipped breaker/crusher for coal and other material in which the drum is rotated at close to critical speed, and in which lifter shelves in the drum are adjusted for dropping material into the path of the rotor at a point where the rotor not only fragments the material, but also emphasizes the flinging of the material against the downwardly moving perforated wall of the drum. Methods of this character enable a relatively small breaker/crusher to effectively duplicate the performance of much larger existing units, while successfully controlling the production of fines.