US524993A

US524993A - Man and frank a

Info

Publication number: US524993A
Authority: US
Publication date: 1894-08-21
Anticipated expiration: 1911-08-21

Description

2 Sheets-Sheet 1.

ATTORNEY Patented Aug. 21, 1894.

W. H, DIXON. ROCK DRILL.

(No Model.

UNITED S To all whom it may concerns; Be it known that I, WILLIAM H. D IXON,"a citizen of the United States of America, residing at Denver, in the county of Arapahoe and State of Oolorado,have invented'certain new and useful Improvements in Rock-Drills; and I do declare the following to be a full, clear,

and exact description of the invention, such as will enable others skilled in the art towhich it appertains to make and use the same, reference being had to the accompanying draw-' ings, and to the figures of reference marked :hereon, which form a part of thisspecifica- My invention relates to improvements in rock drills specially designed for operation by hand power; and the same consists'of the features, arrangements and combinationsfheral inafter described and claimed, all of which will be fully understood by reference to the accompanying drawings in which is" illustrated an embodiment thereof.

. In the drawings, Figure 1 is a top or plan view of the drill. Fig. 2 is a sideelevation partly in section. Fig. 3 is an end elevation of the drill, shown on a reduced scale, and in position for use. Fig. 4 is a fragmentary view of the drill shown partly in section, and partly in side elevation. Fig.5 is a cross-seco tionof the frame, the ratchet made fast on the feed screw, and its operating mechanism, l being shown in elevation. Fig.6 is a rear, end elevation of the machine. Fig. 7 is a cross-section taken through the framework, the ram and the feed screw, on the line :1;-a:,

Figs. 1 and 2.

Similar reference characters indicate corresponding parts or elements of the mechanism in the several views.

Let the numeral 5 designate the stationary PATENT QFFIGE.

WILLIAM HJDIVXON, oF unrivnacoLonnno, ASSIGNOR, B DIRECT AND MESNE ASSIGNMENTS,OF ELEVEN-SIXTEENTHS TO CHARLES E. GART- MAN ANDFRANK A. JOSLIN, or SAME PLACE.

ROCK-DLRILL.

srncrrrcA'rioiv forming part pe gram No. 624,993, dated August 21, 1894.

A Application filed February 27, 1894. Serial No. 501,744. (No model.)

groove of corresponding shape formed in the base or stationary frame 5. Upon the frame '6 is mounted the ram 12 which is journaled in boxes 13. This ram is surrounded by a coil-spring 14 which bears against a collar 12 i at one extremity and a journal box 13 at the opposite extremity. One extremity of the ram carries a chuck 12 in which the drilling t'oolor bit 15 is inserted; while theopposite end of ,the ram carries a ratchet head 16 en gaged by a forked frame 17 through which thereduced extremity of the ram passes. The. arms 17 of the fork engage grooves formed in the sides of the frame 6 in which tojform bearing surfaces for the cams 18 mounted on the shaft 19 which is journaled in boxes 20 on frame 6.

shaft 19. As this shaft is rotated, the frame 17 is engaged by the cams 18, whereby the ram is alternately forced backward and released. As the ram is carried backward by der tension, while the recoil of the spring, as soon as the ram is released, carries the latter forcibly backward, and delivers the blow against the rock through the medium of the drill bit 15.

The necessary partial rotation of the drill bit between strokes is obtained through the instrumentality of actuating mechanism connected with the ratchet 16 of the ram; This fulcrumed on the frame 17; an actuating pawl 23 engaging the ratchet head, and to which the lever is pivoted; and a locking pawl 24 also engaging said head. The lever widest at its rear extremity; hence, every time the frame 17 moves backward (the cam being relatively stationary) the ram, together with the drill bit, is given a partial rotation preparatory to delivering the blow. The forward longitudinal movement of the frame 6 tongue 6 centrally located and engaging a they are adapted to slide. The extremities ofthe arms are turned inward as shown at 17 Suitable hand cranks 21 are attached to the the forked frame, the spring 14 is placed unactuating mechanism consists of a lever 22 22 is in turn actuated by a cam 25 made fast on the frame 6, and provided withan inclined face 25 engaging the lever. The cam 25 is" naled in the ends of the frame 6 below the ram and engaging a divided nut 27 attached.

to the stationary frame 5. This screw shaft carries a ratchet disk 28 which is engaged by a pawl 29 pivoted on alever 3O fulcrumed'on the frame 6 and having its free extremity located in the path of a cam 31 made fast on [0 one arm of the frame 17. It will be observed that as the'screw shaft 26 is actuated, the frame 6 is carried forward. This forward movement of the frame, however, doesnot determine the feed of the ram and drill bit; in other words, the frame 6 may get ahead of the ram, since the forward movement of the latter is determined. by the structure of the rock engaged by the bit. Now, if by reason of the hardness of the rock, the frame gets in advance, or toofar ahead of the ram, the cam 31 will cease to engage the lever 30,.since the forward movement of the frame 17, at each stroke of the ram, islimited by the movement of the latter; hence the frame 6 will wait for the ram, so to speak, until the latter has reached the proper position relatively to the frame, when the cam 31 will again engage the lever 30, depress the pawl 29, impart a partial rotation to the screw shaft and move the frame Hence the for- I ward movement of the frame 6 is automati- 0 6 forward a certain distance.

cally regulated to harmonize with the progress of the ram and drill bit, which will, of

' course, depend upon thecondition of the rock.

5 Mounted on the cam shaft 19, is a gear 32 From the foregoing description, the opera- .tion of my improved rock drillwillbereadily understood. The cam shaft is rotated by the use of. the cranks 21. The cams 18 are thus made to engage the extremities 17 of the forked frame 17, whereby said-frame, and the ram, or reciprocating shaft 12,'are alternately carriedbackward and suddenly released. As .soon as the ram is released, the recoil-of the spring 1 L carries it forcibly forward. As the frame-17 reeiprocates, the feed mechanism,

' and the mechanism for imparting the partial rotation to the ram and drill bit, are operated. Having thus described my invention, what I claim is In a rock drill, the combination with the movable and stationary frames, of the springactuated ram slidingly mounted on the movable frame, a frame 17 sliding-1y attached to the movable frame and re'ciprocati'ng with the ram to which it is attached, and feed mechanism consisting of a screw shaft journaled in the movableframe and carrying a ratchet disk, a nut made fastlin the stationary frame and through which said s'haf-t passes, a lever fulcrumed on the movable frame, apa'wl pivoted on the lever and engaging the ratchet disk, and a cam consisting of a plate attached WILLIAM H; DIXON.

Witnesses:

G. J. ROLLANDET, CHAS. E. DAWsoN.