US927181A - Rock-drill making and sharpening machine. - Google Patents

Description

Patented July 6, 1909. 4 SHEETS-SHBBT 1.

ATTORNEYS ramZi l J1 G. W. SMITH. ROCK DRILL MAKING AND SHARPBNING MACHINE.

APPLICATION FILED JUNE 17, 1905.

WITNESSES.

Auousw, a. mum m. mow-umuomrnsns. WASHINGTON D c.

G W. SMITH. ROCK DRILL MAKING AND SHARPENING MACHINE. I

APPLIOATION FILED JUNE 17, 1905.

urns, wwnmgn. n. c.

F I m.

mw G I ANDREW. a. mum! on, mm-urwunw G. w. SMITH. ROCK DRILL MAKING AND SHABPENING MACHINE. 927,181

APPLICATION FILED JUNE 17, 1905.

' WITNESSES. INVENTOH G'rarnZ 7405792 6572 By w ATTORNEY;

, c. mwzw. a. GRAHAM co, mw-umoemmins fnsumerou. n

G. W. SMITH.

ROCK DRILL MAKING AND SHABPBNING MACHINE.

APPLICATION FILED JUNE 17, 1905.

927, 1 81,. Patented July 6, 1909.

4 SHEETS-BHEHT 4.

.93 7d 3 24 24 .9aZ

In Mi a Hil 1 I I 1! r i /6 I I6 I I i I I u (5 ANDREW. B ovum (20., www.momnuus. wnsmnmon. D. c.

GRANT W. SMITH, OF OTTUMWA, IOWA.

ROCK-DRILL MAKING AND SHARPENING MACHINE.

Specification of Letters Patent.

Application filed June 17, 1905.

Patented July 6, 1909.

Serial No. 265,777.

To all whom it may concern:

lie it kimwn that l, GRANT V1 SMITH, residing at (lttumwa, in the county of VVzLIWllO and State of lowa, have invented a new and. Improved Hock-Drill Making and. Sharpening Machine, of which the following is a speci lication.

The object 01. my present invention is to provide a new and improved means for accurately fashioning andsharpening rock drills and other drills, cl :1. simple, compact and durable construction, in which the drill mai ing and sharpening mechanism is especially adapted to be actuated under pneumatic power and in. which. the several parts are designed. to be easily manipulated, quick in action and elliective for the intended purposes.

Generically, my invention comprehends a suitable support or bed casting on which is mounted die holders, automatically movable within their seats or supports, in such manner, whereby to separate or open up in one direction of their movement to permit of a quick and accurate insertion of the drill or bit stock, and to close together when the dolly is put into operation, whereby to pinch the drill stock in such manner, that the harder the dolly hits the drill, the tighter the dies pinch it to firmly secure it to the desired position.

My invention also comprehends an improved correlation of parts, particularly designed. for effecting a rapid fashioning and sharpening of the bit or drill stock and in such manner that the drills come out of the machine finished red hot and about the right heat to receive the temper.

111 its more subordinate features, my inven tion consists in certain details of construction and peculiar combination of )arts, all of which will be hereinafter 'lul y described, pointed out in the appended claims, and illustrated in the accompanying drawings, in which Figure 1, is a perspective View which illustrates the general arrangement of my inven tion. Fig. 2, is a top plan view thereof, the parts being adjusted to hold the die carriers and dies separated to permit of the insertion of the bit or drill stock. Fig. 3, is a similar view showing the die carriers and dies positioned. to pinch the drill, the dolly being at its rearmost position in full lines and to its ham- Inering or die engaging position in dotted lines. Fig. l, is a longitudinal section taken on the line r e of Fig. 3, the dolly being shown to its foremost or hammering position. F ig. 5, is an inverted plan vicwof a portion of the parts shown in Fig. 4., the dolly actuating means being at their rearmost position. F 6, is a perspective view of the dolly. Fig. 7, is a detail horizontal section taken substantially on the line 7- 7 of Fig. 4:. Fig. 8, is a longitudinal. section of one of the adjustable crank link members on the line 88 of F 3. Fig. 9, is a transverse section taken on the line 9-9 of Fig. 4. Fig. 10, is a cross section. on the line 10-10 on Fig. 3, looking in the direction of the arrow. Fig. 11, is a similar view on the line 1111 of Fig. Fig. 12, is a cross section on the line 13-43 on Fig. 3. Fig. 1.3, is a transverse section on the line 14-44 of Fig. 2. Fig. 14, is a detail view of the two die holders. Fig. 15, is a similar view of the two die members.

In the practical. assembling of the parts, that constitute my complete machine, they are suitably mounted upon a pair of strong bed timbers or beams, (t ct, supported on piers 71-4) to bring the mechanism to the proper height for convenient manipulation thereof. In all its details, the mechanism comprises a main casting or base 9 which extends lengthwise of and is bolted. to the timbers ac and its inner or head end 9 is widened to accommodate the die holding devices presently referred to.

At the outer end and on the top of the casting 9, is horizontally disposed an air cyl inder 10 which is utilized for actuating the dolly and in it operates the piston 10 whose rod extends through the gland 10 and terminates in a forked head 10 to receive the flattened shank 12 of the dolly carrier 1.2 mounted to reciprocate in a bearing 9 projected up from the casting 9, on which bearing the carrier is slidably held by the box or cap piece 13 bolted on the hearing as shown and the said carrier is arranged to be reciprocated under air pressure, fed into the opposite ends of the cylinder 10 in the manner hereinafter explained.

The inner end of the carrier 12 has a socket 1.2 to detachably receive the dolly 5 shown in detail in Fig. 6 which is secured to the carrier by the cross pin 5 as clearly shown in the drawing, the said connection being provided to permit of readily changing the dolly by removing pin 5.

l l ld designate a pair of crank shafts that extend down through vertical bearings in the base casting 9 disposed in transverse alinement, one to each side of the dolly head and held. to their bearings by the detachable boxes 1.4L 14 as best shown in Figs. 2 and 3. The shafts 1 1 1 1 are provided for imparting a reciprocating motion to the die holders or carriers 7 7 of soft steel and which are held to slide in the wedge shaped opening 9 formed in a housing section 9 an integral part of the base 9 and projected upwardly in alinement with the dolly and its actuating devices.

The carriers 7 are constructed alike and mounted so their opposing faces form a central opening X to receive the drill bit or stock, indicated by Y, and said carriers 77 are tapered to fit the wedge shaped opening in the housing 9 and have their opposing faces parallel with each other and with the longitudinal axis of the machine, so that, when they are pushed inwardly, through the action of the crank shafts their opposing faces close together toward the drill or stock piece Y, it being understood, that when the said members 77 are pulled forward they separate and give ample room for the insertion of the drill or stock Y, and to further permit of freely placing the bit or stock pieceY in position, the opposing straight faces of said members 77 have notches 7 to allow for the tongs by which the stock Y is placed in position.

8-8 designate the die blocks that are held in sockets 7 7 c in the outer ends of the carriers 7 7 and in which they are firmly held by the straps 21 whose ends are so formed that they can be easily slipped into an interlocked engagement with the headed studs or bolts 21-21'", see Figs. 2 and 3.

In practice the carriers 7-7 are reciprocated about four inches and the wedge of the opening in the housing 9, is such, that when the dolly is put into operation and hits the drill, the dies firmly pinch the drill and the harder the dolly hits the drill, the more the dies pinch, and the wedge shape of the die opening and the corresponding shape of the coincident part of the dies, serve to crowd the dies and the carrier inwardly at each stroke of the dolly.

Each shaft 1414 has a horizontal crank member l4"14 at the upper end which pivotally connect with the ends 18 of the ink connections, each consisting of the members 18-1E and the adjustable union nut 19 that engages the adjacent threaded ends of the members 18 and 18 202O designate check nuts that also engage the threaded ends of the members 1S -18 The members IS -18 are connected to the members 77 by the pins 21 The lower ends of the shafts 1 114 carry forwardly projected crank arms 14 the free ends of which are fulcrumed on a cross head 17 which slides in a longitudinal groove 9 in the bottom of the casting 9 and the said head is held to the groove by the flange plates 17] 7, as clearly shown in Figs. 4 and 5.

The cross head is actuated by a piston 15 that works in the cylinder bolted upon the lower side of the casting 9 at that end on which the cylinder 10 is mounted.

It will be noticed by reference to 5, the cross head connection with the crank shafts let-14 is such, that as the said cross head comes to the position shown. in Fig. 5 it gives great strength in shutting the dies and holding them firmly shut, and the union nuts 19 on the top connections can be readily ad justed so the position of the inner ends of the links 16, when as shown, will be practically on a central line and ill thereby produce great power in holding the dies shut. it will also be noticed by reference to Fig. 5, that the rounded ends of the cranks or link members 1616 are so fulcrumed that they roll against each other, to relieve the fulcrum pins ]6"16 of unnecessary strain.

The piston 15 is actuated at predetermined times to move the die carriers to their inner or outer adjustments by a valved controlled air supply to each end of the cylinder 15 which will hereinafter be again referred to.

To properly guide the carriers or holders during movement, the upper side of said carriers 7 7 have longitudinal grooves 7 -7 that extend the full length of the carriers as best shown in Fig. 1 1 and which receive the pendent flanges 2 1 2 t formed upon the under side of the cap plates 2 l24 bolted on the housing casting 9 and which lap over the opening therein as shown.

26 designates a rectangular frame that is bolted to and extends reaiwardly from the casting 9 and which is provided with paral lel horizontal guideways, see Fig. 13, upon which is slidably held the cast metal frame or carriage 27 also of rectangular shape and which has at its opposite ends pendent portions 27 as best shown in Fig. 1.

Upon the frame 27 is slidably mounted a third air cylinder 31 which is utilized for effecting a hold back action, since it acts to hold the drills or bit stock members being shaped and sharpened from slipping through the dies, and forms, as it were, the cushion or abutment to take up the impact shock against the end of the drill head imparted by the dolly. The sliding frame 27 is connected to the die holders or carriers 77 by a pair of link rods or arms 2828, the connection of said arms with the frame and carriers 7 7 being such, that when pneumatic or other force is applied to reciprocate the members 7 7 the for reasons presently explained and for such purpose the said cylinder 31 has lateral flanges 13 -13" that ride upon guide ways 27 -27 formed in the frame 27 as best shown in Fig. 13. It should. be stated, however, that the cylinder casing 31, when. properly adjusted upon the frame 27, is fixedly held on the said frame to move with it and to provide for effecting the slidable adjustment of the cylinder 31 on the frame 27, a long feed. screw 30 is mounted under the cylinder 31 which has its ends supported in the pendent members 27 -27 on the frame 27 and which engages the pendent threaded portion of the cylinder 31. At its forward end the screw 30 carries the bevel pinion 30 which meshes with a pinion 30 on a short crank shaft 30 journaled in the frame 27 (see Fig. 12) to move therewith. The purpose of adjusting the cylinder 31 on the frame 27 is to provide for setting the said cylinder 31 on the frame to accommodate different lengths of drills. The frame 27 is held to slide on the supporting frame26bycap plates 26 26 see Fig. 13.

designates a soft steel bar that takes through the guide aperture 1O in the body of the cylinder 31 at a point between the air chamber and its screw aperture, see Fig. 13 and to maintain the said bar in its proper position it has a vertical rib 33 that engages with the groove 33 a in the said cylinder body.

It will be observed by now referring to Fig. 4 that the bar 33 extends inwardly to a point near the dies 8 and it has its rear end connected to the frame 26. This bar is firmly held and forms a central guide for the frame 27 and at the inner end it has a vertical eX- tension which forms guide rest for the forward end of the piston rod 31, and the latter has a socket 35, the outer end of which is slotted at the top (see Figs. 2, 3 and 4) to permit of drop 'iingthe rear end of the drill therein, and slipping it back. within the socket formed in the end of the piston rod 31 to provide for a quick connection of the drill with the plunger or piston rod 31.

In the complete machine air is led to and. exhausted from the three cylinders 10, 15 and 31 by suitably arranged valved feed pipes controlledv by lever mechanism arranged to be actuated by the operator.

For the cylinder that controls the operation of the dolly, a throttle valve T is placed in the back of the air pipe that leads to the air chest, and the said valve is controlled by a rod 25 actuated. by a lever if.

U designates a lever that controls the feed and exhaust of the air to the cylinder 15 that controls the opening and closing of the die holders, and. the said lever cooperates with a three-way valve 33 at each end of the said cylinder which are coupled by a rod w with which the lever U connects whereby a shift of the lever U in one direction, opens one end of the cylinder 15 to atmosphere while air is being fed into the other end.

V designates a third lever that controls the air feed to the hold on cylinder, the same operates a three way valve 4 located right at the lever and from which runs a one-half inch air hose 4: that connects with the end of the cylinder 31.. By moving the lever V back in the direction indicated by the arrow on Fig. 3, the air will be let out of the cylinder 31 so its piston can be moved. back by hand. any time the operator so desires.

The manner in which my machine operates, briefly stated, is as follows :-The drill or stock piece is dropped in the slot or opening between the carriers 7-7 and the dies 88 and the piston in cylinder 31 is pushed back until the drill stock extends enough beyond the dies to upset and fill the dies. The drill is now held by the tongs up against one die, and by then adjusting the lever that controls the cylinder 15 to feed air therein, the carriers 77 and the dies 88 are moved back into the wedge shape opening in the base 9 until the dies close and pinch the drill. The lever that controls the air to the hold on cylinder 31. is then adjusted to feed air in thecylinder 31 to hold the piston forward to exert a cushion pressure against the rear end of the drill, and when the latter adjustment has been made the operator steps on the foot lever, which sets in action, the cylinder that actuates the dolly, which is successively and in the practical application of my invention, caused to rapidly impact the drill head. As soon as the drill head has been upset enough to fill the dies, the air is released from the hold on cylinder which then allows the drill to be driven baclf into the dies, giving as it were, a push in motion to the drill stock, and this final operation on the drill gives its head or bit end the desired shape and diameter.

It will be observed that by reason of the peculiar construction and arrangement of parts shown and described, the operation of forming and sharpening the drill is effected entirely by pneumatic action and while three distinct air cylinders, each having an independent function, are provided, the means for controlling the said cylinders are under direct control of the operator and are such that a large number of drills can be sharpened in a very little time, in the practical use of my machine, the capacity being about one hundred and eighty per hour.

The sharpening is done so quickly as to leave the drill finished while red hot and in a proper heat for tempering.

My construction of drill fashioning and sharpening machine is adapted for any shape of steel drill stock, round, hexagon, or regular drill steel, but is more especially adapted for pound or hexagon bullets or drill stock memers.

By using an air held hold on for backing up the drill stock, I am enabled to positively hold the drill in position to be engaged by the dolly, since the dies alone are not sufficient under a severe impact of the dolly to hold the drill. The pneumatic pressure on the back end of the drill makes it possible to obtain an accurate forming and sharpening of the drill without the least danger of bending the drill stock which would occur were the hold back in the nature of a solid abutment, as the dolly has to strike so hard to put the teeth on, that the stock it held against a solid abutment will upset too much and bend between the dies and holders. Again the air in the cylinder 31, makes a cushion hold back which can be regulated to suit and compensate for any excessive hammering on the drill head. Again, since the air cylinder 31 is long enough to allow for a variation of piston adjustment from four to five inches, for different sizedrdrills, this avoids actuating the crank gears for shifting the frame 27.

From the foregoing taken in connection with the accompanying drawings, the complete operation, construction and advantages of my invention it is believed will be readily apparent to those skilled in the art to which it appertains.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is

1. In a machine of the class described, the

combination with an upsetting means having converging surfaces, dies for gripping the drill stock, and slidably mounted between said surfaces, said dies adapted to hold the drill stock in position to be engaged by the dolly and a hold-back for engaging the rear end of the drill stock which consists of a longitudinally movable frame and a fluid pressure controlled cylinder and piston arranged to be held up against the drill and means for adjusting the cylinder for different lengths of the drill stock.

2. The combination of the reciprocatingly mounted dolly or upsetting devices, of the wedge shaped chamber, the wedge shaped die holders mounted therein, the dies mountr ed in the holders, the air cylinder 15 and piston therein, the cross head connected to the piston, the crank shafts 1414 the link arms 16, connecting the said shafts and the cross head, and the link arm connections that join the shafts and the die holders as set forth.

GRANT I. SMlTH.

Witnesses:

E. R. MrroHELL, J. H. MITCHELL.

Images