US157133A - Improvement in rock-drills - Google Patents

Description

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Rock-Drills.

Patentedv Nov. 24, 1874'.

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UNITED STATES vPATENT OFFICE.

CHARLES S. PATTISON, OF ASTORIA, NEW YORK.

IMPROVEMENT IN ROCK-DRILLS.

Specification forming part of Letters Patent No. 157,133, dated November 24, 1874; application filed September 8, 1874.

To all whom it may concern:

Beit known that I, CHARLES S. PATTIsoN, of Astoria, in the county of Queens and State of New York, have invented an Improvement in Rock-Drills; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

This improvement is designed to avoid lost motion usually consequent upon the wear ot the thread ofthe feed-nut and screw, or, in other words, to use the motion that would otherwise be lost; and it consists in making the feed-nut in two parts, and with threads of different pitch, such that when its larger or main thread, or the thread upon the screw, becomes in any degree worn away by use, it may be turned and tightened by means of its liner thread, thus drawing the two parts-of the nut together, or separating them wider apart, and meeting the loss by wear. y

In the drawing, A is the main screw, and B D my improved feed-nut, formed in two parts, as shown, each part having a thread, b, corresponding to that of the screw A, this thread b of the part B extending through a portion of its length, and the remainder of this part B having a bore ofV larger diameter, in which is made a finer thread, c, corresponding with the 'thread d on the exterior of the part D, which extends through the head of the cylinder, the cylinder and nut being shown in longitudinal section, the better to display the construction of the parts constituting my improvement. e f are lock-nuts, serving to hold D firmly to place.

This construction of the nut B D, with its coarser and finer threads, the coarser thread engaging with A, and the finer thread serving to adj ust the parts B D to each other, enables the nut, when the larger threads have been worn away so as to work loosely, to be tightened up by screwing nearer to or farther from each other, by means of the thread 0, until the lost motion is taken up.

A space, h, is purposely left between the portion B of the nut and the lock-nut g sufficient to allow for all the lost motion that is possible from this wear; and this lock-nut g, when the lost motion has been taken up, may be screwed up against B to hold it firmly to place; and my construction permits the satisfactory use of my improved divided nut, with its capacity for taking up and using the lost motion, until the thread upon it or upon screwA is entirely gone.

Instead of the threads of different pitch, the same result may be accomplished by putting in threads of the same pitch, the one being a right-hand and the other a left-hand thread.

-It is found from experience that nuts made as above described are far more durable than when made as heretofore, lasting more than twice as long.

I claim- The feed-nut made in two parts, B D, each engaging with the thread ofthe screw A, and also engaging with each other by means of a finer thread, c d, and operating in the man'- ner and for the purpose described.

Executed this 8th day of August, A. D. 1874.

CHARLES S. PATTISON.

Witnesses:

EDWD. M. WHITNEY, THEO. V. AYEEs.

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