US3015240A

US3015240A - Drill attachment

Info

Publication number: US3015240A
Application number: US848347A
Authority: US
Inventors: Carl D Hodnett
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-10-23
Filing date: 1959-10-23
Publication date: 1962-01-02
Anticipated expiration: 1979-01-02

Description

Jan. 2, 1962 c. D. HODNETT 3,015,240

DRILL. ATTACHMENT Filed oct. 25, 1959 IN VEN TOR.

United States Patent O 3,015,240 DRILL ATTACHMENT Carl D. Hodnett, Rte. 3, Box 252, Goldsboro, N.C. Filed Oct. 23, 1959, Ser. No. 848,347 2 Claims. (Cl. 77-55) This invention relates to a novel attachment for power drills for holding and centering such as the heads of bolts, relative to the drills while drilling the bolts for their removal from plates secured together by the bolts.

The primary object of the invention is to provide an eicient, easily installable attachment of the kind indicated, especially but not exclusively, for air operated drills used in aircraft construction and repair work, which facilitates and speeds the removal, without damage to plates, of Jo-bolts, thereby saving labor, time, and material.

Another object of the invention is to provide a simple and rugged device of the character indicated above, which is composed of only two relatively movable parts, other than a spring tensioning these parts away from each other, one of which serves as an adjustable holder `for a removable Io-bolt set.

Other important objects and advantageous features of the invention will be apparent from the following description and the accompanying drawings, wherein, for purposes of illustration only, a specific form of the invention is set forth in detail.

In the drawings:

FIGURE l is a vertical transverse section taken through a device of the invention, showing the same installed on an air-operated drill casing;

FIGURE 2 is a horizontal section taken on the line 2 2 of FIGURE l;

`FIGURE 3 is a side elevation, partly broken away in section, of the upper barrel of the device;

FIGURE 4 is a horizontal section taken on tbe line 4-4 of FIGURE 3;

FIGURE 5 is a side elevation of the expanding spring;

FIGURE 6 is a horizontal section taken on the line 6--6 of FIGURE 5;

FIGURE 7 is a side elevation of the Io-bolt set mounting ring;

FIGURE 8 is a top plan view of said ring;

FIGURE 9 is a side elevation of the lower barrel of the device, partly broken away and in section; and

FIGURE l0 is a horizontal section taken on the line 1li-1l) of FIGURE 9.

Referring in detail to the drawings, wherein like numerals designate like parts throughout the several views, the illustrated device, generally designated 10, comprises a barrel composed of an upper mounting barrel section 12, a lower slideway barrel section 14, a Jo-bolt set mounting and slide ring 16 working in the lower barrel section, an expanding spring 18 compressed between the ring 16 and the upper barrel section 12, and a Io-bolt set 2i) secured in the ring 16. i

The upper barrel section 12 comprises a tubular cylinder having an internally threaded upper end 22 to be threaded, as indicated at 24, on the lower end of the casing 26, of a drill, such as an air-operated drill as used in aircraft construction and repair; with the drill chuck 28 extending below the casing 26, out of contact with the upper barrel section 12, and having a drill bit 30 chucked therein. The upper barrel section 12 is open at its lower end and is yformed thereat with a reduced diameter inwardly offset terminal 32, which, at its inward side, provides an annular stop shoulder 34, spaced upwardly from the lower end 36 of the terminal, and external screw threads 3S below an external shoulder 40, spaced above the internal shoulder 34.

The lower or slideway barrel section 14 comprises a ice tubular cylinder having a partially closed lower end 42, provided with a central axial opening 44, and having a side wall 46 which is formed with a pair of diametrically opposed, closed vertical slots 48. The lower barrel section 14 is preferably of the same outside diameter as the upper barrel section 12, and has in its upper end a threaded socket 50 into which the upper barrel section terminal 32 is threaded, to connect the barrel sections together.

The slide ring 16 is a relatively large cross section annulus of an outside diameter to slide snugly in the bore 52 or' the lower barrel section 14, and has a central axial threaded opening S4. Diametrically opposed radial threaded sockets 56 opening to the peripheral edge 58 of the ring have threaded therein studs 60 which engage slidably through related ones of the slots 48 and have enlarged heads 62 on their outer ends to bear against the exterior of the lower barrel section 14.

The expansion spring 18 is a relatively heavy helical spring which is confined in the -lower barrel section 14, spacedly surrounds the drill bit 30, and is spaced close to the bore 52, and is compressed between the internal shoulder 34 of the upper barrel section 12, and the top of the slide ring 16, and serves to normally engage the ring 16, with the closed lower end 42 of the lower barrel section 14, as shown in lFIGURE 1, so as to fully extend the I o-bolt nut engager set 20.

The Jo-bolt set 20, for which substitutions can be made depending upon the work to be done, comprises a tubular shank 64 of an inside diameter to rotatably and slidably receive the drill bit. The shank 64 has a threaded upper end 66 which extends freely through the opening 44 in the lower end of the lower barrel section and is threaded into the opening 54 of the slide ring 16. The shank 64 has an enlarged diameter cup-shaped head 68 on its lower end, providing a nut receiving socket 70 of the shape of the nut 72 of a Io-bolt 74 extending through engaged

plates

76 and 78, from which the bolt is to be removed by drilling the same to the extent necessary to eect its easy removal. As shown in FIGURE 1, the socket 7i) is shallower than the nut 72, so that the lower end 8l) of the socket is kept out of contact with the work from which the bolt is to be drilled until the bolt has been drilled down.

It will be understood from the foregoing that the drill case 26 being held stationary and the socket 70 being engaged runder pressure with the nut 72, and the drill being put into operation, the set 20 is held against rotation, relative to the nut 72 and to the device 10, by reason of the engagement of the studs 6l) with the slots 48 in the side wall 46 of the lower barrel section 14, and the spring 18 enables cushioned application of the necessary pressure upon the nut 72, while the drill bit 30 is rotated in contact with the bolt 74, and that the bit 36 is kept eentered on the bolt.

Although there has been shown and described herein a preferred form of the invention, it is to be understood that the invention is not necessarily confined thereto, and thatany change or changes in the structure of and in the Y relative arrangements 'of components thereof are contemplated as being within the scope of the invention as defined by the claims appended hereto.

What is claimed is:

l. In combination, a drill having a casing, a rotary chuck mounted on the casing and depending below the lower end of the casing, a drill bit chucked in the chuck and extending downwardly therefrom, a tubular barrel secured on the lower end of the drill case and extending downwardly therefrom, said barrel having a lower end wall having an axial opening larger in diameter than the drill bit, a ring sliding within the barrel above said lower end wall, the barrel having a side wall formed with closed vertical slots, studs on the slide ring extending out through and sliding in related slots, a helical compression spring Within the barrel surrounding and out of contact with the drill bit, said spring being compressed between said ring and an upper part of the barrel, said ring having a central opening for attachment of an implement thereto, said barrel comprising an upper barrel section and a lower barrel section having an upper end removably and nonrotatably connected with the lower end of the upper bar rel section, the fupper barrel section being threaded on the drill casing and the lower barrel section being threaded on the upper barrel section.

2. In combination, a drill having a casing, a rotary chuck mounted on the casing and depending below the lower end of the casing, a drill bit chucked in the chuck vand extending downwardly therefrom, a tubular barrel secured on the lower end of the drill case Vand extending downwardly therefrom, said barrel having a lower end wall having an axial opening larger in diameter than the drill bit, a ring sliding within the barrel above said lower end wall, the barrel having a side wall formed with closed Vertical slots, studs on the slide ring extending out through and sliding in related slots, a helical compression spring, within the barrel surrounding and out of contact with the drill bit, said spring being compressed between said ring and an upper part of the barrel, said ring having a central opening for attachment of an implement thereto, said implement comprising a tubular stem having an upper end securably engaged in the opening of the ring and extending freely through the opening in the lower end wall of the barrel, said stem having a bore vrotatably and slidable receiving the drill bit, said stem having a lower end having an enlarged head iixed thereon and having a nut-receiving socket in itsllower end, said barrel comprising an upper barrel section and a lower barrel section, said lower section having an upper end removably and non-rotatably connected with the lower end of the upper barrel section, said upper barrel section having an internal shoulder against which the upper lend of the spring bears, the upper Vbarrel sectionrbeing threaded on the drill casing and the lower barrel section being threaded on the upper barrel section.

' References Cited in the lile of this patent UNITED STATES PATENTS 2,375,112 Kanihan May 1, 1945 FOREIGN PATENTS 510,482 Great Britain Aug. 2, 1939 916,987 France May 1, 1945