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Publication numberUS254199 A
Publication typeGrant
Publication dateFeb 28, 1882
Filing dateNov 2, 1881
Publication numberUS 254199 A, US 254199A, US-A-254199, US254199 A, US254199A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Process of preparing the surfaces of grinding-rolls
US 254199 A
Abstract  available in
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Description  (OCR text may contain errors)

(No Model,l



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the accompanying drawing, forming a part of .manner as to be pressed into the surface of the UNITED STATES PATENT OFFICE@ WILLIAM N. COSGROVE, OF FARIBAULT, MINNESOTA.


SPECIFICATION forming part of Letters Patent No. 254,199, dated February 28, 1882. Application filed November 2, 1881. (No model.)

To all whom it may concern:

Be it known that I, WTLLIAM N. CosGRovE, of Faribault, in the county of Rice and State of Minnesota, have invented a certain new and Improved Process of Preparing the Surfaces of Grinding-Rolls; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to this specification, in which the figure represents a pair of rolls prepared in accordance with my invention.

My invention consists, first, in an improved mode or process of preparing grinding-rolls for flouring-mills, consisting in pressing sand, emery, corundum, or other analogous or equivalent material into the surfaces of smooth metal rolls, whereby a peculiar indented surface is given to the rolls, which renders them very effect-ive in grinding line middlings to flour or in sizing coarse middlings; and, secondly, in'a process of indenting smooth metal rolls, consisting in passing sand, corundum, or other like or equivalent material between a pair of such yrolls closely adjusted together.

In carrying out my invention a pair ot'smooth metal rolls are adjusted very close together and rotated so that their proximate surfaces run in the same direction, and a quantity-otL sand, emery, corundum, or other like material is then run through between the rolls in s uch4 rolls and form very even indentations therein. This simple process forms a dress on lthe rolls that especially adapts them to the grinding of line middliugs into liour and to the sizing of coarse middlings, the granulation being made very even, and the material not being fiattened so much as by smooth rolls.

From practical test I have found that a pair of rolls can he perfectly dressed in a few mnutes by running twenty or thirty pounds of sand between them.

I do not desire to be limited to the use. of sand, emery, or corundum, or any combination of these materials in carrying out myprocess, as other materials and combinations of materialsmay be effectively employed. Nor do I desire to be limited to the pressing of the material into the surfaces ofthe rolls by passing it between them, as the rolls to be dressed mayV be pressed against any kind or shape of surface covered with the indenting material with the same effect.

I claim as my invention- 1. The herein-described mode or process ofl dressingsmooth metal rolls, eonsistingin pressing sand, emery, corundum, and other analogous or equivalent material into the surfaces of said rolls to form an indented dress, as set forth.

2. The process of indenting smooth metal rolls, consisting in passing sand, emery, corundum, or other like equivalent material between a pair of such rolls closely adjusted together, substantially as described.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2685315 *Jan 31, 1952Aug 3, 1954Toledo Scale CoSlicing machine having a sand blasted gauge plate
US3029155 *Aug 21, 1959Apr 10, 1962Continental Can CoEnamel-powder resist systems
US6086003 *May 26, 1998Jul 11, 2000Maschinenfabrik Koppern Gmbh & Co. KgRoll press for crushing abrasive materials
Cooperative ClassificationB21D3/10