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US Patent: 235,133
Micrometer Gage for Wire & Sheet Metal
Samuel Darling - Providence, RI

USPTO Classifications:

Tool Categories:
metalworking tools : machinist tools : measuring tools : micrometers


Not known to have been produced

John E. Hall
Henry R. Davis

Patent Dates:
Applied: Jul. 22, 1880
Granted: Dec. 07, 1880

Patent Pictures:
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The object of my invention is to make an adjustable screw-gage containing devices for performing with great accuracy and facility the functions of a wire and sheet-metal gage, the sizes corresponding with the Birmingham, Stubs, or any standard gage that may be desired; also, that shall contain a graduated scale by which articles can be measured with in one-thousandth of an inch, more or less, and which will show how many thousandths of an inch each number of the wire-gage contains, and the difference in thousandths of an inch between any two numbers of the gage and also that will show when an article does not exactly agree with any number of the gage how many thousandths of an inch it varies from it; and also to so arrange the gage that the sizes of wire or sheet metal can be conveniently given in thousandths of an inch as well as by the wire-gage; and also to make a gage that will have the least tendency to wear in use, will show when it is worn out of true, and can be readily adjusted by any person of ordinary skill. It consists .in making a screw-gage having a screw of suitable pitch, preferably ten to the inch, a sleeve or cylinder of sufficient size and attached to the screw, an indicating-arm parallel with the sleeve and beveled and graduated on one edge and end, a scale on the sleeve graduated into one hundred parts, more or less, and also a scale graduated and numbered spirally on the sleeve, corresponding to the Birmingham or some other wire-gage, numbering from 0000 to No. 36, more or less, the figures and graduation-marks being put on the sleeve in a spiral form, corresponding with the pitch of the screw, whereby, when the gage is applied to measure wire or sheet metal, the indicating-mark on the beveled end of the arm will show what gage it is if it be an exact gage. or if it be not an exact gage the edge of the arm will show how many thousandths of an inch it is more or less than the gage, and whereby it may be known how many thousandths of an inch there are in any number of the gage, or between any two numbers, so that the merchant or consumer can order goods by thousandths of an inch by the wire-gage, or by the wire-gage minus or plus any number of thousandths of an inch desired. There are three objections to the wire and sheet-metal gages now in use: First, they cannot be made sufficiently accurate without too much expense; secondly, they soon wear out of true by the great friction they are subjected to; and, thirdly, they cannot be applied at a distance from the edge of a sheet of metal, which is necessary to get the full thickness and clear the barb on the edge of the sheet, while in my improved gage the tendency to wear is comparatively small, and when it is worn out of true it can be easily adjusted.

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