US Patent: 793,620
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| Limit Gage
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Patentee:
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| Albert A. Bailey (exact or similar names) - Cohoes, Albany County, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 29, 1904 |
| Granted: |
Jun. 27, 1905 |
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Joel Havens
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Description: |
| Alexander & Dowell, patent attorneys
This invention is an improvement in measuring instruments or limit-gages for use in the manufacture or selection of interchangeable parts of machines. The ordinary limit-gage is simply a piece of metal with two openings in it, or two diameters, one slightly larger than the size of the piece to be gauged and the other slightly smaller. If a finished piece will enter or fit the larger part of the gage, but will not enter or fit the smaller part, it is considered acceptable, although different pieces of like form and intended to be used interchangeably may not be exactly alike measured by a micrometer. The object of the present invention is to simplify the gages by requiring but one opening or diameter or length of gage and to provide such a gage with a yielding adjustable part which can be fixedly set to a predetermined measurement, such as the exterior or interior length or diameter of a certain object, and also without altering its adjustment will allow a limited variation in the size of such objects, such as will not affect their practical interchangeability, so that the workman using the gage will not lose time in measuring to an absolute scale, and yet cannot make such variations in measurement as will affect the practical interchangeability of the parts. For this purpose the device has a "size-adjusting" 4° means and a "limit-adjusting "means, the latter being an automatically-adjustable contact point which can slightly yield to pressure, and anything which will fit closely between the contact-points of the size and limit indicators will be serviceable and interchangeable with other similar parts of like dimensions, although one may and the other may not cause the limit-gage to yield. In my limit-gage no absolute measurements and gradations for the allowable-variation regulator are required. This device moves between two fixed limits—that is, its possible extent of movement is definitely limited in both directions, and the distance between these fixed limits determines the extent of possible practical variation of similar objects, although these may differ in size if measured by a micrometer. The workman, however, does not have to note any scale or index, as necessary in using a micrometer-gage. |
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