US2025567A

US2025567A - Drill

Info

Publication number: US2025567A
Application number: US567162A
Authority: US
Inventors: Gouverneur G Brown
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-10-06
Filing date: 1931-10-06
Publication date: 1935-12-24
Anticipated expiration: 1952-12-24

Description

Dec. 24, 1935. G, G, BROWN 1' 2,025,5 7

DRILL Filed Oct. 6, 1951 INVENTOR 1/ t/amnamg law/z ATTORNEYS Patented Dec. 24, 1935 UNITED STATES PATENT OFFICE Application October 6,

10 Claims.

This invention relates to drills, and more particularly to rock drills comprising a sleeve carried by the bit within the open upper end of which a drill shank is inserted and secured by a keeper.

In such constructions, the forces operating to separate the drill parts are applied directly on the keeper in shear, resulting in rapid wear, gradual loosening of and play between the parts, and short life of the drill.

The main object of the present invention is to provide a drill construction in which these forces are borne directly by the more substantial drill parts and no force in shear is applied on the keeper, which merely operates to hold the drill parts in proper engagement for sustaining these forces.

With this object in View, the invention consists in certain features, combinations, details of construction and arrangements of parts which will first be described in connection with the accompanying drawing showing the invention in preferred forms and then more particularly pointed out in the claims.

In the drawing:

Figure 1 is an exploded perspective view of a drill embodying one form of the invention;

Figure 2 is a top plan view of this drill with the drill shank in section;

Figure 3 is a section taken on line 3--3 of Figure 2;

Figure 4 is a view similar to Figure 2 showing a modification; and

Figure 5 is a section on line 55 of Figure 4.

Referring to the drawing, the drill shown by way of illustration comprises, .generally, a drill bit I0 having on its lower face drilling teeth II and on its upper face an open ended sleeve I2, within which is inserted the lower end of a drill shank I3. For convenience of manufacture, the sleeve I2 is shown as a separate piece which will be welded onto the drill bit Ill, but may be formed integral therewith. The sleeve I2 is of angular form to substantially correspond to the angular drill shank I3 to provide a non-rotary connection between these parts, these parts being shown as of the preferred hexagonal form.

In accordance with the present invention, the drill bit sleeve and drill shank are so modified in shape as to provide cooperating engaging surfaces adapted to receive directly and sustain the separational forces of the drill, and means is provided for holding and maintaining the cooperating engaging surfaces of the drill bit sleeve and drill shank in rigid connection,

1931, Serial No. 567,162

For this purpose, the sleeve I2 is formed with all its sides normal to the bit IIJ, excepting only the inner side wall I, which is inclined inwardly and upwardly from the bottom to the top of the sleeve I2, and, because of this inclination of 5. side wall I, the sleeve I2 is made substantially larger than the shank I3. The lower end of drill shank I3 is provided with a similar, but oppositely inclined side for cooperative engagement with the inclined side wall I, by forming an undercut 2 and removing the metal from the inner end of undercut 2 to the lower edge of this side of the shank I3 to provide a downwardly enlarging taper 3. To permit assembly of the shank IE5 within sleeve I2 with taper 3 and inclined side Wall I in proper engagement, the opposite corners a and b of sleeve I2 are preferably squared slightly as shown. It will be understood that the shank is off center to the bit as introduced into the sleeve, but brought into central position when the walls I and 3 are in locked position.

Holding means is also provided for maintaining the cooperating engaging surfaces I and 3 of, respectively, sleeve I2 and shank I3 in tight interlocking engagement. As shown in Figures 1-3, this holding means comprises a suitable filler sleeve 4, a keeper 5 and a keyway or slot 6 formed partially in filler sleeve 4 and partially in the sleeve I2, the slot 6 being, preferably, slightly smaller than the keeper 5 to secure sufficient Wedging action to force the interlocking faces of sleeve I2 and shank I3 into tight engagement. After the coupling has been made, the ends of keeper 5 may be upset against the exterior of sleeve l2, as shown at I. The holding means may be of any other form suitable to hold the parts in proper position.

In assembling the drill parts, the end of drill shank I3 is inserted in the sleeve I2 with the interlocking walls 3 and I opposite each other and the shank moved sidewise to engage these walls. The filler sleeve 4 is then placed within sleeve I2 and keeper 5 forced through slot 6 to bind the parts tightly together and its ends are upset as shown at I. In order to separate the parts for removal of the bit or repairs, it is only necessary to reverse the above steps.

In the modification shown in Figures 4 and 5,

' the holding means comprises solely the slots 8, 8' formed in opposite sides of the sleeve I2, as shown, and the keeper 9, which in this case is of sufficient size to tightly fit between shank I3 and the inner wall of sleeve I2, and the keeper being of sufficient width to hold the parts firmly together.

It will be understood that the invention is applicable to types of drills other than that shown and that the invention is not to be limited to the constructional details shown and described as these may be varied within the invention as defined by the claims.

What I claim is:

l. A drill comprising a bit, an open ended sleeve carried by the bit and having a continuous side wall, a drill shank inserted within said sleeve, a non-rotary connection between the sleeve and shank, interlocking inclined surfaces on said sleeve and shank preventing withdrawal of the shank from the sleeve, and holding means comprising a filler member between the shank and sleeve, and a keeper and slot for holding said shank and sleeve in such interlocking and nonrotating engagement.

2. A drill comprising a bit, an angular open endedsleeve carried by said bit and having a continuous side wall with an inwardly upwardly inclined portion, an angular drill shank inserted within .said sleeve and having on one side a downward outward tapercooperating with the inclined portion of the side wall of said sleeve to secure an interlocking engagement therewith, and holding means for maintaining the interlocking inclined surfaces of said sleeve and shank in tight engagement.

3. A drill comprising a bit, an angular open ended sleeve carried by said bit and having a continu'ous side wall with an inwardly upwardly inclined portion, a drill shank inserted within said sleeve and having on one side a downward outward taper cooperating with the inclined side wall of said sleeve to secure an interlocking engagement therewith, and holding means comprising a keeper passing through the sleeve and maintaining the interlocking inclined surfaces of said sleeve and shank in tight engagement.

4. A drill comprising a bit, an angular open ended sleeve carried by said bit and having an inwardly upwardly inclined side wall, an angular drill shank inserted within said sleeve and having on one side a downward outward taper cooperating with the inclined side wall of said sleeve to secure an interlocking engagement therewith, and a filler member, said sleeve and filler having coacting slots, and a keeper in said slots maintaining said sleeve and shank in tight engagement.

5. .A drill having on the bit an angular sleeve with inclined wall I, and opposite parallel surfaces a, b, angular shank l3 having inclined side 3,'filler 4 between the sleeve and shank, said filler and sleeve being slotted to form keyway 6, and a keeper 5 in said keyway and passing through the sleeve walls for holding the shank and sleeve in position.

6. A drill comprising a bit, a drill shank, an

open ended sleeve connection betwen the bit and shank, said sleeve having a continuous side wall, inclined surfaces on the sleeve and shank coacting to prevent withdrawal of the shank from the sleeve, and holding means between the shank 5 and sleeve for maintaining the inclined surfaces in interlocking engagement.

'7. A drill comprising a bit, a drill shank, a sleeve connection between the bit and shank, said sleeve having a continuous side wall and an open 1 end, the open end of'said sleeve being formed to permit the passage of the shank oiT-center to the bit and to be centered by relative sidewise movement of the shank and bit, and a keeper center the shank and sleeve, two of said members being formed to provide oppositely inclined surfaces coacting to lock the shank and bit together in centered position.

8. A drill comprising a bit, a drill shank, a sleeve connection between the bit and shank, said sleeve having a continuous side wall and an open end, the open end of said sleeve being formed to permit the passage of the shank off-center to the bit and to be centered by relative sidewise movement of the shank and bit, and a keeper between the sides of the shank and sleeve actingto center the shank and sleeve, a portion of the sleeve being formed as an inwardly upwardly inclined'wall, a portion of the shank being formed as an outwardly downwardly inclined surface facingthe inclined wall of the sleeve, said inclined surfaces coacting to lock the sleeve and shank together in centered position.

9. A drill comprising a bit, a drill shank, an angular sleeve connection between the bit and shank, said angular sleeve having a. continuous side wall and an open end, the open end of said sleeve being formed to permit the passage of the shank off-center to the bit and to be centered by relative sidewise movement of the shank and bit, and a keeper between the sides of the shank and sleeve acting to center the shank and sleeve, two of said members being formed to provide 'opshank and bit together in centered position.

10. A drill having on the bit a sleeve "with vertically inclined wall I, Opposite parallel. surfaces a, 1), extending horizontally in a plane normal to between the sides of the shank and sleeve acting to 15 positely inclined surfaces coacting to lock the the wall I, and plane surfaces on the sleeve extending at anangle to and between eachpedge of the inclined wall and one of the'surfaces a, b, angular shank l3 having an inclined surface 3 and surfaces parallel with and coacting with the above-mentioned plane surface 0 on the sleeve,

and a keeper holding said inclined surfaces and said coacting parallel surfaces on the shank and sleeve together when moved into interlocking engagement by relative movement of the. sleeve and shank along said surfaces a, b.

' GOUVERNEUR G. BROWN.