US94266A - Improvement in clamp-screw for calipers - Google Patents

Description

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ya@ Y lm PKmLITHOGRAPMER, WASHINGTON. D. C.

DANIEL WRIGHT, JR., OF VVALTI-IAM', MASSACHUSETTS.

Letters Patent No. 94,266, dated August 31, 1869.

IMPROVEMENT IN CLAMP-SCREW FCR CALIPERS, 8cc.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, DANIEL WRIGHT, Jr., of Waltham, in the county of Middlesex, and State of Massachusettsfhave invented a new and useful Improvement on Screws; and I do hereby declare that the Vfollowing; is a full-and exact description thereof', reference being had to the annexed drawing, making a part of this specification, in which- Figure l shows the nut and screw, as applied to a common caliper;

Figure 2 is a side view of the clamp;

Figure 3 is a longitudinal section of same; and- Figure 4 is a bottom view of iig. 2.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

To give an idea of my invention, I will describe the same as used on a tool called calipers, for measuring outside diameters, and thicknesses of shafts, bars, plates, 85o., or as used on a pair of dividers, for laying out diierent sizes' of circles, curves, Sto.

In using the above-named tools, it frequently happens that the artisan has at one time to take a very small measure, say, for example, one-eighth to onefourth of an inch, and, immediately after, he may have occasion to take a pretty large measure, say, for example, ive to six inches, which difference necessitates the screwing out and in ofthe handle or nut (as commonly used) al great number of revolutions, as the screw o is, in suc-h a case, of a very tine pitch. This repeated turning ot the handle or nut is very annoy.- ing,'takes a long time, and is greatly complained of by artisans having occasion to use similar tools.

T01 obv'iate this diiiculty, l construct my nut or handle'D as being split in its lower or tapped end, D, where the screw plays, and yconnected together at its upper end by means of loops or springs, D' D', as shown in ligs. 1, 2, and 3, which make ahandle for the purpose of turning the same on the screw.

The handle or clamp D, when 1n its natural 'position, plays entirely free over the screw c, and the calipers or similar tool may therefore he open or shut; at

pleasiue, without turning the handle; but by simply pushing this clamp or handle into the conical recess, or conical ring E, is the tool securely locked by means of the pressure outward from the spring B, on the conical recess, which thereby crowds together the jaws D" D (fig. 3) over the screw, and makes the'handle similar to a solid nut. l

Should the tool again be required for a larger or smaller measure, the pressure together of the jaws D D may instantly be relieved by means of pressing together' of the legs of the tool over F, (fig. 1,) when the jaws, D D" open, allowing them to play entirely free over the screw o, till such a place that is convenient to the measure to beitaken, when, by only pushing the nut or handle into the conical ring or socket, the tool is instantly locked, and the handle changed into a solid nut, having all the advantages of a common nut, withnone of its disadvantages.

Havingthus described the nature and construction of my-invention,

I wish to secure by `Letters Patent, and

l. A handle or nut, made in two parts, connected with a spring, and tapped for the reception of a screw, for the purpose set forth. f

2. The conical end D of the divided nut D, in combination with the hollow conical washer E, or the conically-shaped recess in the part operated upon, substautially as shown and described.

DANIEL WRIGHT, JR.

Witnesses:

ALBAN G. ANDRS, A. LnSTEvENS.

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