US2010070A

US2010070A - Replaceable bit rock drill

Info

Publication number: US2010070A
Application number: US696509A
Authority: US
Inventors: Erickson Charles
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-11-03
Filing date: 1933-11-03
Publication date: 1935-08-06
Anticipated expiration: 1952-08-06

Description

Aug.a 6, 1935.v

c. ER'lcKsoN REPLACEABLE BIT ROCK DRILL Filed Nov. 3, 1955 .a7 Il z QW, z5

2 Sheets-Sheet 2 Patented Aug. e, 193s UNITED STATES PATENT OFFICE i Application November 3, 1933, Serial No. 696,509 6 Claims. (Cl. Z55-44) y tive shapes of stockv and bit whereby a loose iit is assured for the bit beyond the base and facilities for cooling provided within and about the socket and bit as pointed out in the claims following a description'in detail of the shape preferred in carrying out this invention.y

'I'he objects of the invention are to eliminate the breakages of the 'jaws of the stock .-lof the drill following the sharp blows incident -to the operations of drilling holes .and the consequent impacts of the bits with the rock, thereby avoiding troubleand delay in the replacement of the drills and materially increasing the speed and eiiiciency in carrying on the work in mining and contracting and at the same time economizing in so far as the consumption of steel is concerned through the expenditures of money in labor and power in transporting quantities `oi' ymetal sometimes to almost inaccessible places; to construct a stock and bit which will contain provisions for a constant ow of water and consequently keep the bit cool throughout the drilling operation;

and generally to overcome the difliculties incident to the use of a drill of this classication and hitherto found to be troublesome in the matter of fractured jaws.

In the drawings, Figure 1 is an end elevation view of the bit and drill assembled showing the stock broken away. Y

Figure 2 is a side elevational view of the assembled bit and drill showing the stock broken away.

Figure 3 is a longitudinal sectional view of the stock broken away and of the bit within the socket and taken on the lines 2-3 in Figure 2.

Figure 4 is a longitudinal sectional view of the stock taken on the lines 5 4 in Figure 1 with the bit removed.

Figure 5 is a cross sectional view through the complete drill taken on the lines 5 5 in Figure l.

Figure 6 is a cross sectional view through the complete drill taken on the lines 6--0 in Figure 1.

Figure 'Z is a cross sectional view through the complete drill taken on the lines 1-1 in Fig7 ure 1.

Figure 8 is a cross sectional view of the b inserted in the socket of the stock and taken on the lines l in Figure 1.

t Figure 9 is a plan view` of the upset head of the s oc Figure 10 is a plan view of the underside of the bit.

Like numerals of reference indicate corre- 5 sponding parts in the various ilgures.

Referring to the drawings, the bit is indicated by the numeral I5 and the shape of this bit is all important in relation to its holder for in its impacts with the rock following the blows on l0 the holder, the results from these impacts must `not aiect the holder in s uch a way as to cause a fracture, therefore the base I6 on the bit should be flat and its head I1, a form of spear-shape in cross section omitting any barbs, while the thick- 15 ness through the bit at the extremities of the head, much the same as through the extremities of the bit at the base. V

The bevels IIA form the sides of the head I1 and terminate in the cutting edge I 8 of the head. 'I'he 20 neck I9 is formed by the inwardly curving surfaces 20 on either side, extended into the surfaces on either side of the shank portion 2|, so that the bit in cross section is obtapering shape from the base to the neck, or in other words, the bit has 25 a `tapered shank Yfor the side walls and extends outwardly on the convergentlines as far as the neck.

Along the base of the bit, the water groove 22 extends from end to end, while the corners be- 30 tween the fiatr base and theshank surfaces are 'bevelled at both sides and ends as shown at 23.

The stock indicated by the numeral 24 is preferably a bar of steel upset at one end and slotted at the upset end to form the

jaws

26 and 2i, 35 comprising a socket 21 for the bit and the inner wall surfaces of these jaws extend outwardly in convergentV lines of direction from the flat base 28 which is between the illlets 22 and 3l roughly corresponding to the bevels 22 of the bit.

The convergent lines of the inner wall surfaces of the socket 21 form a longer taper from substantially the same base as the bit or nearly so, consequently, there are formed on either side of the bit, the spaces II and I2 widening out from the bases of bit and stock in the direction of the outer endof the stock. naturally the result is that room is permitted in the socket for the slight upsetting of the bit due to its impacts on the rock.

The jaws 25 and 2l are chamfered at the outer ends 3l and 24 to facilitate a passage of chips on either side of the bit from the end surfaces 2l and 26 and on either side of these chamfered surfaces the corners are bevelled in each instance. as shown at 31 and 33.

The central water channel 39 within the stock empties into the socket 21 centrally and the central cross grooves 40 and 4I in the fiat base 28 of the socket 21 register with the feed water channel 39. The

slots

42 and 43 are respectively cut into the

jaws

25 and 26 midway of the length of these jaws and the 4inner corners of the walls forming the said jaws at the ends thereof are chamfered oi at 44 and 45 to reduce the contacting surface with the bit. v

The

slots

42 and 43 register with cross slots 46 and 41 communicating with the main water channel 39, therefor, there is an assurance of a continuous supply of water around the bit an in the hole drilled.

The shank of the bit I5 may be formed of softer texture than the head or blade portion which is rather an important feature for the very good reason that the metal of the shank necessarily becomes upset in its socket to a very slight extent but sufliciently to take the earlier eifects of the impact or in other words to sustain the ilrst shock, which is all important in any holding device.

In the use of this tool, the bit is inserted from one side and settles itself in the socket through the impact. 'I'he natural result of the original blows is to upset the shank of the bit a trifle so that it becomes thicker from the lower part of the neck inwardly and the result of this is that the spaces 3| and 32 are filled up, but not before the bit has settled in its own place and it will be noticed that the full force of the blow is taken on the at base, and as each shock occurs, the bit broadens out in so far as thickness is concerned upwardly from the base until it is well established in the socket, that is to say, until the spaces are completely filled up and any further upsetting may occur on the turned corners, consequently there is really no jar of any moment on the jaws at all, and by the .time the spaces 3l and 32 are well illled up, the metal of the bit is like a lling of a hole between harder surfaces, and any impact on that filling causes little or no eifect on the harder surfaces which are here represented by the jaws.

What I claim is:

1. In a replaceable rock drill stock and bit, a bit formed with a. head and base and an intervening shank and a longitudinal water groove across the base and a stock suitably formed to receive the bit.

2. In a replaceable rock drill stock and bit, a stock having a longitudinal Ywater channel therewithin and a socket at one end to receive a bit, said socket having a flat base and water grooves thereacross registering with said feed water channel, and a bit correspondingly formed to instantly iit in said. socket.

3. In a replaceable rock 'drill stock and bit, a stock having a longitudinal water channel therewithin and a socket formed of jaws slotted centrally forming Water outlets registering with cross slots in turn registering with the central water feed channel.

4. In a replaceable rock drill stock and bit, a stock having a longitudinal water channel therewithin, and a socket at one end to receive a bit, said socket having a flat base and a Water groove there across registering with the longitudinal water channel, and jaws projecting upwardly and forming a part of said socket slotted centrally and extending below the level of the socket base, and forming grooves therein at right angles to the water grooves and leading into the water channel, and a bit correspondingly formed to instantly ilt in said socket.

5. In a replaceable rock drill stock and bit, a stock having a longitudinal-water channel therewithin and forming a bit socket having upwardly tapering walls slotted centrally forming water outlets registering with the cross slots in turn registering with the central water feed channel, and a bit in cross sectional shape tapering in sharper converging lines than the socket walls and becominga looser ilt outwardlyv from the socket and terminating in a blade portion.

6. In a replaceable rock drill stock and bit, a slotted cylindrical stock forming a bit socket and having a longitudinal water channel therewithin, side walls converging upwardly and inwardly from the base of said socket to form jaws and slotted centrally and having shoulders at the top bevelled olf on the sides to form naps, the base of said socket having water grooves thereacross registering with the water channel, a bit having a fiat base and correspondingly formed to instantly i'lt in said socket and a 'longitudinal water groove across the base of the bit and corresponding with the water groove across the base of said socket.

CHARLES ERICKSON.