US2742439A

US2742439A - Drill head or bit

Info

Publication number: US2742439A
Application number: US370547A
Authority: US
Inventors: Thomas S Hallett
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-07-27
Filing date: 1953-07-27
Publication date: 1956-04-17
Anticipated expiration: 1973-04-17

Description

April 1%, 1956 T. s. HALLETT 2,742,439

DRILL HEAD OR BIT Filed July 27 1953 THOMAS S. HALLETT INVENTOR BY $08M ATTORNEY United States Patent DRILL HEAD OR BIT Thomas S. Hallett, Calgary, Alberta, Canada Application July 27, 1953, Serial No. 370,547 Claims. (Cl. 255-312) The present invention relates to a drill head or bit and it consists in the combinations, constructions and arrangements of parts herein described and claimed.

Generally the invention relates to a drill head or bit which is particularly adaptable for the drilling of rock, coal and other minerals and which includes a pair of cutter wheels which are so positioned and shaped that they are caused to revolve upon their axes when the drill head or bit is rotating, thus presenting a plurality of cutting surfaces to the walls and base of the hole being drilled. One of the features of the invention is the provision of means whereby the various parts of the device may be removed and/ or replaced.

An object of the invention is the provision, in a device of the character set forth, of a pair of novel centering or positioning cones forming a ,partof the invention.

Another object of the invention is to provide a device of the characterset forth in which the various parts are easily removed and replaced as desired.

Another object of the invention is to provide, in a device of the character set forth, a pair of interlocked cutting wheels of novel construction and forming a part of the invention.

A further object of the invention is to provide, in a device of the character set forth, novel retaining pins forming a part of the invention.

Another object of the invention is to provide, in a device of the character set forth, a novel pull washer and associated spring both forming parts of the invention.

Other and further objects of the invention will become apparent from a reading of the following specification taken in conjunction with the drawing, in which:

Figure l is a side elevational view of an embodiment of the invention,

Figure 2 is a view taken at right angles to Figure 1 and showing the device in a hole being drilled thereby and attached to a conventional drill rod,

Figure 3 is an exploded elevational view certain elements of the invention,

Figure 4 is a plan view of a part of the invention,

Figure Sis an exploded elevational view illustrating a cone and spindle both forming parts of the invention,

Figure 6 is an enlarged longitudinal sectional view of a cutter wheel forming a part of the invention, and

Figure 7 is a plan view ilustrating certain elements of the invention and their corelation as viewed, for example, along line 7--7 of Figure 1.

Referring more particularly to the drawing, there is shown therein the lower end of a conventional drill rod 10 which is rotatable at the surface by conventional means (not shown). A frame is generally designated at 11 and is provided with a horizontally extending flat upper surface 12 from which extends upwardly and cen-. trally a cylindrical member 13 which, in turn, has extending upwardly therefrom an externally threaded projection 14 which is adapted to be threaded into the lower end of the rod 10, as indicated at 15 in Figure 2.

illustrating pull washer forming a 2,742,439 Patented Apr. 17, 1956 and 18 is substantially centrally bifurcated as indicated at 19 and 20, respectively, to provide therein legs 21 and 21a in the leg portion 17 and

legs

22 and 23 in the leg portion 18. The outer face of the leg 21a and the outer face of the leg 22 are both machined so that they incline inwardly and downwardly as clearly shown, for example, in Figure 1 of the drawing and the

openings

19 and 20 are provided with sides which lie parallel to their respective inclined faces, the latter being shown at 24 and 25.

A pair of spindles each of which is generally designated at 26 is provided and one of such spindles extends through the lower portions of the

legs

20 and 21 while the other spindle 26 extends in an opposite direction through the

legs

22 and 23 and it'will be seen that each of the spindles is positioned at right angles to one of the faces 24 and 25.

Each of the spindles 26 is provided with an elongated cylindrical body portion 27 one end portion 28 of which is enlarged and provided at its outer end with a conical termination 29. The conical termination 29 provides, with the enlarged portion 28, a shoulder 30.

A frusto-conical member 31 is revolubly mounted upon the enlarged portion 28 and may, if desired, be provided with a ball race 32 to lessen the frictional contact thereand encircling the 34which are adaptedto extend vertically downwardly through the

legs

21, 21a, 22 and 23. Each of the body portions 27 of the spindles 26 is provided upon its upper 'side with a pair of longitudinally spaced recesses 36.

Revolubly mounted upon each of the spindles 26 between the legs 21 and 21a and the

legs

22 and 23, respectively, and extending in opposite directions as clearly shown in Figure 7, is a cutter wheel which is generally designated at 37. Each cutter Wheel 37 is provided with a hub 38 and a plurality of curvular teeth 39 having sharpened outer edges 40. A compression spring 41 surrounds the cylindrical portion 13 and bears against the upper face of the washer 32' at one of its ends and against the underside of the rod 10 at its other end.

It will be seen that the device may be quickly and easily assembled or disassembled by first placing the frustoconical member 31 upon the enlarged portion 28 of its respective cylinder and thereafter inserting the spindles 27 through the legs 21 and 21a and through the

legs

22 and 23 in opposite directions while at the same time mounting the cutting wheels in opposite directions upon such spindles between the aforesaid pairs of legs. When the cutting wheels are thus assembled, it will be apparent that the outer faces of the teeth 39 will interengage. The pins 34 may then be inserted through the openings 33 until the heads 35 thereof lie within such openings and the lower ends of such pins engage within the recesses 36 in the spindles 26. The spring 41 may then be mounted over the cylindrical member 13 and the threaded member 14 engaged in the lower end of the rod 19 whereupon the spring 41 will be compressed and will bear against not only the upper face of the washer 32 but also against the heads 35 of the pins 34 to thus ensure the positive engagement of the pins 34 with the spindles 26 whereby to prevent the accidental removal of such spindles and their attached devices.

Inoperation, it will be apparent that the thus assem-' action upon the bottom 43 of a hole 44 in which the device is mounted and that, due to the inclination and dishing of the two cutter wheels 37 together with the interlocking relationship one with the other, that the wheels revolve upon their respective spindles as the device is rotated. It will be also apparent that the

members

29 and 31 together forming cones (which are externally serrated as illustrated, for example, in Figures 1 and 7) will follow their respective cutter wheels as the bit revolves, absorbing the back thrust of the wheels and holding them in their proper cutting position and at the same time acting as reamers to true the inner circumference of the drill role to thereby keep the drill bit centrally located in the drill hole.

Reference to Figure 2 of the drawing will show a relatively small core 45 formed centrally upon the bottom 43 of the hole 44' which core 45 will build up to the point of engagement between the two cutter wheels 37 and also at that time act as a centering device for the location of the drill head or bit within the hole 44.

While but one form of the invention has been shown and described herein, it will be readily apparent to those skilled in the art that many minor modifications may be made without departing from the spirit of the invention or the scope of the appended claims.

What is claimed is:

1. A device of the character described comprising a frame bifurcated to provide a pair of dependent portions, said portions each being bifurcated to provide a pair of dependent legs, a spindle extending through each pair of legs, a toothed cutter wheel revolubly mounted upon each spindle between its respective pair of legs, said toothed cutter wheels being enmeshed with each other, a conical terminal member formed integrally with an outer end of each of said spindles, and a frusto-conical 4 member revolubly mounted on each spindle adjacent its respective terminal and forming a substantial continuation of said terminal, said spindles each extending in an inclined direction with respect to the vertical axis of the frame.

2. A device as defined in claim 1 wherein said cutter wheels each comprise a dished disc, and wherein a plurality of spaced cutting teeth are formed on the peripheral portion of each disc, said teeth acting as cutting members and as engaging teeth for said meshing of one cutter Wheel with the other.

3. A device as defined in claim 1 wherein the effective cutting diameter of said wheels is at least as great as the effective operating diameter of said cones.

4. A device as defined in claim 1 wherein said spindles are removably mounted in said frame, and wherein means is provided for locking said spindles against rotation.

5. A device as defined in claim 4 wherein said means includes a drill rod, an upwardly extending portion for said frame threadably affixed in the lower end of said rod, a pair of recesses in the upper side of each spindle, pins each extending vertically through said frame and each receivable in one of said recesses, a shoulder formed in the upper end of said frame, a washer mounted on said frame and bearing against the upper face of said shoulder, and a compression spring surrounding said upwardly extending portion of the frame and bearing against the upper face of said washer and the lower end of said rod.

References Cited in the file of this patent UNITED STATES PATENTS 1,867,545 Akeyson July 19, 1932 1,939,131 Montgomery et al Dec. 12, 1933 2,068,327 Howard et a1. Jan. 19, 1937

Claims

1. A DEVICE OF THE CHARACTER DESCRIBED COMPRISING A FRAME BIFURCATED TO PROVIDE A PAIR OF DEPENDENT PORTIONS, SAID PORTIONS EACH BEING BIFURCATED TO PROVIDE A PAIR OF DEPENDENT LEGS, A SPINDLE EXTENDING THROUGH EACH PAIR OF LEGS, A TOOTHED CUTTER WHEEL REVOLUBLY MOUNTED UPON EACH SPINDLE BETWEEN ITS RESPECTIVE PAIR OF LEGS, SAID TOOTHED CUTTER WHEELS BEING ENMESHED WITH EACH OTHER A CONICAL TERMINAL MEMBER FORMED INTEGRALLY WITH AN OUTER END OF EACH OF SAID SPINDLES, AND A FRUSTO-CONICAL MEMBER REVOLUBLY MOUNTED ON EACH SPINDLE ADJACENT ITS RESPECTIVE TERMINAL AND FORMING A SUBSTANTIAL CONTINUATION OF SAID TERMINAL, SAID SPINDLES EACH EXTENDINNG IN AN INCLINED DIRECTION WITH RESPECT TO THE VERTICAL AXIS OF THE FRAME.