US531043A - Rock-drill - Google Patents

Description

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H'. P. & G. B. JONES. ROCK DRILL.

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' H. P. & B. JONES.

' ROCK. DRILL,

No, 531,043,. Patented Dec. 18, 1894.

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PATENT rrice.

HARVEY P. JONES AND GEORGEB. JONES, OF DENVER, COLORADO.

ROCK- DRILLL/ SPECIFICATION forming part of Letters Patent No. 531,043, dated December 18, 1894.

Application filed A plil 10, 1894.

To aZZ whom it may concern:

Be it known that we, HARVEY P. JONES and GEORGE B. JONES, both of Denver, in the county of Arapahoe and State of Colorado, have invented a new and Improved Rock- Drill, of which the following is a full, clear, and exact description.

Our invention relates to improvements in rock drills; and the object of our invention 1s to produce acomparatively simple machine which may be adjusted at any angle, which has a vertically adjustable support capable of holding the drill in almost any kind of a place where it would be desirable to work it, which is provided with a spring-propelled hammer adapted to strike with great force on the drill, which may be easily operated by means of a crank handle, which has a very simple mechanism for turning the drill after each blow of the hammer, which has a sliding frame or carriage adapted to move easily on its support, and which is constructed in such a manner that the recoil of the drill serves to feed it forward so as to hold it always in position for rapid drilling. v

To these ends our invention consists of certain features of construction and combinations of parts, which will be hereinafter "described and claimed.

Reference is to be had to theaccompanying drawings, forming apart of this specification, in which similar figures of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the machine embodying our invention. Fig. 2 is an end view of the same. Fig. 3 is a detail sectional plan, showing the arrangement of the extensible track and the means for supporting and adjusting the frame. Fig. 4 is an enlarged detail longitudinal section of the drill frame and its support. Fig. 5 is a detail plan view of the drill frame and its mechanism with the upper half of the frame removed. Fig. 6 is a vertical cross section on the line 66 of Fig. 4. Fig. 7 is a detail perspective view of the lever for releasing the pawls of the drill frame and track. Fig. 8 is an enlarged sectional plan on the line 8-8 of Fig. 1, show- Serial No. 507,003. (No model.)

drill frame 10, which is preferably cylindri- Y cal and is composed of upper and lower half sectionslland 12, which have meeting flanges 13 adapted to be'bolted together, and onthe under side of the lower section 12 is a way 14 which receives the track 15, this being of a generally rectangular shape and provided with flanges at top and bottom, as shown clearly in Fig. 6, to enableit to be dovetailed into the way 14 and also into the bed 16 which serves as a support for the drill frame and which swings on a vertical axis, so that the angle of the drill maybe readily adjusted, the bed having thereon a transverse sleeve 17 which at one edge is provided with serra 'tions 18 adapted to engage thesimilarly serrated part of the boss 19 on the clamp 20 by which the drill frame and the mechanism above'described are secured to the supporting'sta'ndard of the machine.

The clamp 20 has projecting from the boss 19 a spindle or arm 21, which extends through the sleeve 17 and a bolt 22 enters the end of this spindle, the bolt being provided with a handle 23, to enable it to be tightened, and in this way the sleeve 17 may be forced into close contact with the boss 19 so as to fasten the bed rigidly to the boss, and by loosening the bolt and tilting the bed and again tightening the bolt the bed may be fixed at any desired angle. The spindle 21 and boss 19 project from one jaw 24 of the clamp 20, this jaw being hinged to a corresponding jaw 25 and the two jaws have meeting flanges 26 which are held together by a bolt 27, this being preferably provided with' a handle 28.

The clamp 20 is adapted to clasp the standard 29 whichis hollow and has, at its lower end, a screw 30 adjustable up and down,and seated in a claw 31 which is adapted to form the bearing for the lower end of the standard.

The upper end of the standard has an extensible rod 32 which terminates in a rigid claw 33 adapted to fit against an upper wall, so that in case the drill is used in a mine or equivalent place the standard may be fastened between two opposite walls and it may be fastened in either a vertical, horizontal or any other convenient position.

The upper'end of the standard 29 has a T 34 attached to it, and in this T is held a follower 35 shaped to fit the rod and this is forced into close contact with the rod 32 by a bolt 36 which is threaded in the outer end of the T, see Fig. 8, and has a handle 37 by which it may be turned. It will thus be seen that the standard may be readily adjusted as to length, that the clamp 20 may be fastened to it so as to hold the bed 16 in a desired position, and that the bed may be adjusted vertically as specified, so as to set the drill at the correct angle.

The track 15 is provided, on its under side, with recesses 38 which are adapted to engage a slide pin 39 which is normally pressed upward by a spring and which is arranged in the bed 16 so as to move vertically, as shown in Figs. 4 and .6. The lower end of the pin 39 is pivoted to a cam lever 40 on the under side ofthe bed 16, and by turning down the lever the pin is drawn down so as to permit the track 15 to be moved freely on the bed and adjusted as desired. The lever 40 is just below the longitudinal strengthening rib 41 of the bed.

On the upper side of the track 15 is a 1ongitudinal row of ratchet teeth 42, the inclined sides of which are toward the rear end of the drill frame, and these teeth are adapted to engage a series of pawls 43 which move vertically in the lower portion of the tubular frame 10 of the drill, the pawls being pressed downward by springs and beveled so as to nicely fit the teeth. The shanks 44 of the pawls 43 are held in a plate 45 which is arranged in the frame 10 and which is just above the bent crank 46 of the lever 47, see Fig. 7, which is journaled transversely in the drill frame and has bent ends 48 which serve as handles so that, by grasping one of these and tilting the lever, the crank 46 may be thrown against the plate 45 so as to lift the plate and pawls and permit the sliding of the drill frame on the track 15. The object of this arrangement of pawls and ratchet teeth is to enable the drill frame to be fed forward by the recoil, as the pawls, being suddenly checked by theteeth, cause the rebound to throw the drill frame forward, and to enable the pawls to always quickly engage the teeth they are arranged so that when one is in close engagement with a tooth another will be a third of the way up a tooth and the other will be two-thirds of the way up a tooth.

On the side edges of the bed 16 are teeth 49, the teeth on the opposite sides being of opposite pitch, and these teeth are adapted to engage rigid pawls or arms 50 on the slides 51 which are mounted on rods 52 held in lugs 53 on the sides of the frame 10, and the slidesare pressed by springs 54 so as to hold the arms 50 in close contact with the teeth 49. When the arms are not to engage "the teeth, they may be turned up and held in catches 55 on the side of the frame 10. The object of this arrangement is to supplement the feed, that is, the ratchet teeth 42 and pawls 43, as when drilling overhead the arm 50 on one side may be made to engage the teeth 49 so as to assist in holding up the drill frame and take the strain off the feed, while in drilling down the opposite arm will be thrown in engagement with the teeth so as to prevent the drill from being fed too rapidly. For horizontal work both arms may be thrown out of engagement with the teeth.

In the front end of the tubular drill frame is a ratchet wheel 56, the teeth of which are on one side, as shown in Fig. 4, and this ratchet wheel has an elongated hub which serves as thedrill holder 57, and the hub projects outward through a reduced end 58 of the drill frame and inward into a suitable bearing 57. See Fig. 5. The drill holder receives the re dnced end or shank 59 of the drill shaft 60 which has a rigid shoulder or collar 61 thereon adapted to abut with the outer end of the drill holder. The outer end of the shaft 60 is adapted to receive the reduced threaded end 62 of the drill bit 63, and this arrangement enables many difierent sizes of bits to be used with a common shaft and enables a sharp bit to be easily substituted for a dull one.

The inner end of the drill shank projects slightly beyond the drill holder, so that it may be effectively struck by the sliding hammer 64 which moves in guides 65 consisting of transverse ribs in the tubular drill frame, and the hammer has a reduced shank 66 which is preferably circular in cross section, this projecting into a spring barrel 67 which is held in the inner end of the frame 10, the barrel being held in suit-able ribs or supports 68 and it has a collar 70 abutting withone of therihs so as to prevent the displacement of the barrel. The rear end of the spring barrel 67 is closed by a cap 71, which is provided with slots 72, like those of the ordinary bayonet joint, adapted to receive a pin 73 on the spring barrel, and this arrangement enables the cap to be adjusted longitudinally and held securely so as to give the desired tension to the spring 69 which is a powerful spring capable of throwing the hammer 64 forward with the desired force.

On the top of the hammer 64 is formed a rack 74 which engages the mutilated gear wheel 75, this having teeth on its opposite edges so that it actuates the hammer twice at every revolution. The gear wheel is hung on the shaft 76 which is supported in lugs 77 on the sides of the drill frame, and the shaft has squared ends to receive the crank 78 by which it is turned, both ends of the shaft being squared so that the crank handle may be applied to either end, as desired. The gear wheel turns in aslot in the top of the frame 10, and to prevent any dirt or other debris from falling into the frame the slot and gear wheel are covered by a hood 79. On one side of the gear wheel is cam 80 which is adapted to engage the bent end 81, see Fig. 5, of the horizontally oscillating lever 82 which is arranged above the hammer 64 and is fulcrumed IIO on the bolt 83 which holds in place a saddle 84 serving as a guide for the lever. In the front end of the lever 82 is held a pawl 85 which is adapted to engage the teeth of the ratchet wheel 56 and which is pressed into engagement'with said ,teeth by a spring 86.

See Fig. 5.

It will be observed that every time the gear wheel 75 is rotated the cam, 80 will tilt the lever 82 and thus turn the ratchet wheel, drill holder and drill, and the cams are arranged so that the drill will be turned just after it has been struck by the hammer. A springpressedpawl 56 held in a casing 56, see Fig.

4, prevents the ratchet wheel from turning back. The lever 82 is pushed back, after being actuated by a cam, by a spring 87 which presses against one side of it, as shown in Fig. 5. The hammer has on opposite sides, projecting arms 88, which are adapted to strike thecushions 89 when the hammer is thrown forward, these cushions being arranged on opposite sides of the hammer in suitable recesses in the frame, and any cush-, ion adapted for the purpose may be used, but each cushion is preferably of leather or rubber or both combined, the yielding part being held between clamping plates which may be adjusted so as to regulate the resiliency of the cushion.

It will be seen from the above description that the drill may be arranged at any necessary angle and when the gear wheel 75 is turned, the teeth of it push the hammer back against the tension of the spring 69, and when the teeth leave the rack on the hammer, the spring throws the hammer violently forward against the drill and, at the same time, the arms 88 strike the cushions 89 which absorb a portion of the shock and at the same time assist in the recoil which effects the feed, and the drillframe is thrown forward against the fixed collar 61 on the drill shaft which causes the frame to suddenly recoil, but its backward movement is prevented by the I pawls 4:3 catching against the teeth 42 and so that the drill frame is again thrown forward, thus carrying the drill into close proximity to the rock which is being drilled. As soon as the blow is struck on the drill the cam 80 and lever 82 turn the ratchet wheel and drill in the manner already described.

. It will be also understood from the above description that as the mechanism is all contained in the tubular frame, it iskept from getting clogged with dirt, and the whole mechanism is protected.

Having thus described our invention, we claim as new and desire to secure by Letters Patent 1. A rock. drill, comprising a supporting standard, a bed adjustably secured to thestandard, a longitudinally movable track on the bed, a fastening device to hold the track to the bed, a drill frame arranged to slide on the track, a ratchet connection between the drill frame and the track, and drill mechanism carried by the frame, substantially as. described.

2. The combinatiomwith the bed having ratchet teeth thereon, thetrack supported on the bed and provided with ratchet teeth, the \drillframe carrying drilling mechanism, the pawls in the drill frame to engage the teeth of the track, and the spring pressed slides on the sides of the drill frame having arms to engage the teeth of the bed, substantially as described.

3..In a rock drill, in combination, a supporting bed having ratchet teeth 49, and having a track way, a drill frame longitudinally 51 on the drill frame having arms 50 adapted to be moved into engagement with such teeth, substantially as shown and for the purposes described.

4. The combination with the bed having at opposite sides the ratchet portions, the teeth of which incline in reverse directions, the track supported on the bed and provided with ratchet teeth, the drill frame carrying drilling mechanism, the pawls in the drill frame to engage the teeth of the track, swinging slides secured on the opposite sides of the drill frame, spring pressed in opposite directions, said slides having arms adapted to be moved into engagement with the teeth on the bed, all arranged substantially as shown and for the purposes described.

5. The combination with the bed frame, the drill frame comprising a casing longitudinally movable on the bed, and the drill holder carried thereby having at a point within the casing a ratchet Wheel, of the spring pressed hammer held within the eastilated gear wheel held to engage such rack portion, said gear having a cam at one side, an oscillating lever pivoted in the casing, having one end held to engage the ratchet wheel, and the other in engagement with the cam on the. gear wheel, all arranged substantially as shown and described.

6. The combination with the drill frame casing, the revoluhle drill holder therein, having a ratchet wheel and the spring pressed hammer having a rack portion, of the mutilated gear journaled within the casing adapted to engage the said rack portion, said gear having cams at one side, the pivoted lever 82 held in the casing having one end held in engagement with the cam, a spring actuated ranged substantially as shown and described.

HARVEY P. JONES. GEORGE E. JONES. Witnesses:

A. P. J ONES, M. 0. Mom.

movable thereon, and spring pressed slides ing, having a rack portion, the revoluhle mu

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