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US Patent: 557,140
Proportional Weighing Apparatus
Edward A. Munson - Grand Rapids, Kent County, MI

USPTO Classifications:

Tool Categories:
specialty tools : scales and balances


Not known to have been produced

C. D. Harrington
Herbert M. Pierce
Walter Davidson
F. L. Middleton

Patent Dates:
Applied: May 31, 1895
Granted: Mar. 31, 1896

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It is the object of my invention to provide a weighing apparatus for use in obtaining the proportional weights of different parts of knives such as used in planers, and also for obtaining the total weights of said knives by one and the same machine and at one operation. Machines have been heretofore devised for obtaining by a succession of operations the relative or proportional weights between different parts of the knife and at another independent operation the total weight; but to work with such a machine requires much time and necessitates repeated handling of the knife before it can be balanced in its different parts and balanced in total weight in relation to the other knives designed to be attached to the same head. Planer-knives may be in perfect balance as regards total weight, but when fastened on the planer-head or cylinder the right end of one knife may be heavy, while the right end of the other knife may be light, and the ends on the left-hand side of the cylinder would be the reverse, resulting in a vibratory motion to the machine, which, besides being detrimental, interferes with good work and is generally objectionable.

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