US923513A - Drill. - Google Patents

Description

M. HARDSOCG.

DRILL. APPLICATION FILEDMAY 5, 1908.

923,513. Patented June 1, 1909. v

Wi 85,5 e5:

MARTIN HARDSOCG, OF OTTUMWA, IWA.

DRILL.

Specification of Letters Patent,

Patented June 1, 1909.

Application filed may 5, 1908. Serial No. 430,962.

To all whom it may concern:

Be it known that I, MARTIN HARDsooG, a citizen of the United States, residing at Ottumwa, in the county of Wapello and State of Iowa, have inventedv certain new and useful Improvements in Drills, of which the following is a spepiiication.

It is desirable', in theo eration of drills, for rock and other similar oring, to furnish a medium under'pressure for keeping the bits or cutters clear of the cuttings, dust and dirt, so that the cutters or bits can do the work more eiectu ally; and it is also desirable, in the operation of such drills, to give a lead or bearing point by which the drill proper can be made to operate so as to produce overlapping holes by which a clean cut or separation is made in the material being acted upon and it is further desirable, in such drills, to have the cutters or bits detachable, so that, as the outer corner or edge becomes worn the cutter or bit can be turned or reversed and present a full' corner or edge for'use.

The object of the present invention isto construct a drill head carrying cutters and a center or lead bit by Which the results, above pointed out asdesirable, can be attained in a practical and successful manner.

The invention consists in the features of construction and combinations of parts hereinafter described and pointed out in the claims as new.

In the drawings Figure 1 is a side elevation of the drill, withthe several elements entering into its construction assembled ready for use; Fig. 2 a sectional elevation of the drill shown in Fig. 1; Fi 3 an end elevation of the drill shown in Fgig. 1; Fig. 4 a sectional elevation broken ofi', and taken crosswise to the elevation of Fig. 2 g and Fig. 5 a det ail in pers ective of a detachable cutter orbit.

Tllie head of the drill is made Ofsteel or other suitable material, and consists of a center 1, and Wings 2 opposite each other and separated, one from the other, by grooves or passages 8, so as to furnish a clearance on opposite sides of the drill head for the re- Inoval of the cuttings, dust and dirt produced in' the drilling o eration.

The base or rear enf of the drill head has a threaded hole 4 continuing from which is a chamber; and from the chamber 5 a assage 6 leads forward. The passage 6 has cading therefrom opposite lateral passages 7, each passage 7 opening through the outer face or' the respective wings; and the outer end of each passage is closed by a plug 8, which construction enables the lateral passages to be bored transversely through the wings of the head. Each lateral passage 7 has, forwardly leading therefrom, va passage 9, and each passage 9, at the acting end of the drill head, terminates in an enlarged opening or mouth 10, so as to permit the free discharge of a medium under pressure at the acting end of the drill for removing the cuttings, dust and dirt to maintain the cutters or bits clear, the removed cuttings, dust and dirt passingrearwardly, through the grooves or channels 3, with the medium under pressure.

lach Wing 2, at the acting end, between the side edge or face of the Wing and the opening 10, has formed thereon a cross head or lip lug 11, extending inwardly 'from the periphery of the wing, and at the center of the body 1 of the drill head is formed ak hole 12, leading rearwardly from which is a hole 13 joining the hole or assage 6, as clearly shown in Fig. 2. The wall of the hole or passage 13, at its bottom or rear end, is provlded with a screw thread 14 to receive the threaded end 15 of a bit or drill stem or stock 16 3 and the drill stem or 4stock has its body reduced in size so as to furnish a neck 17,` with a clearance between the neck and the wall of the hole or passage 13, when the drill stem or stock is entered into position. The forward or acting end of the drill stem or stock has a head 18 of a greaterl diameter in cross section than the neck, so as to furnish a shoulder or abutment 19 between the neck 17 and the head 18, as shown in Figs. 1 and 2. The head or acting end 0I" the center or lead drill is cut away on one side,.so as to form a flat face 20; and the terminal end of the drill, at the end of the flat face 20, is cut on a diagonal line, so as to form an inclined face l21, by which a cutting edge 22 is furnished in conjunction with a curved face 23 on the side of the drill head opposite the flat face 20, as shown in Figs. 2 and 3. A hole or passage 24 extends longitudinally through the drill stemor stoelgand this hole or passage 24 is in communication with the hole or passage 6, so as to discharge a medium under pressure to clear away the cuttings, dust and dirt at the acting end of the center or lead drill. The medium under pressure is supplied to thc passage 6 bjr means ol a suitable supply pi ie, not shown, leading from a source or" supp y, as usual in operating drills in conjunction with amedium under pressure.

Cir

The construction shown, at the acting end of the ldrill head proper, has four cutters -or bits. Each cutter or bit has a body 25 with a cutting edge 26, and at each end of the body, on tliebottom, is a lug 27 with a recess 28 between the Jugs, as clearly shown in Fig. 5. Each bit or cutter has its body entered into a recess 29 formed in the lip i1, with the outer lug engaging the exterior of the lip:l and the innerlug entered into the central ope ning 12and lying against the wall of the body 1 around such opening, so that, when inserted, each bit or cutter will be held iirmly in its rceess 29 by the engagementof the body 25, with the side walls oil the recess and the engagement of the lugs as linst described. .The bits ori cutters are held against forward movement by the engagement of the shoulder 19 of the stein or stock ol' the centeror lead drill with the inner end of each cutter, as shown in Figs. 1, 2 and 4. The center or lead drill is entered partly into the hole or passage 13 therforin the drill head, so that he shoulder 19 will be sutileientlyv above the .end face ol the drill head to allow the main cutters or bits to be entered, into place, and

when the main cutters or bits are entered the stein or stock ol the center or lead drill is threaded into position, thus firmly holding the main cutters or bits in place.

rlhe main cutters or bits, when the outer ends or sides have become worn down so as not to be eilective in performing the cutting operation, can be reversed, bringing the inner end or side te occupy the outer position, and to do this all that is necessary is to partially withdraw the center or lead drill a sufiicient (.listance to disengagc the shoulder 19 from contact with the inain cutters or bits, so that each main cutter or bit can be removed and reversed; and when reversed the main cutters oi' bits can be again secured in place by threading or advancing t'ne center or lead drill, for the shoulder 19 to engage the edge oi` cach main critter or bit. It will thus be seen that the center or lead drill Afurnishes an effective and reliable means for securing the main cutters oi' bits in place on'the end of the drill head, and this without interfering with the operation of the center or lead drill as a drill.

ln use, as the drill head, with the center or lead drill in position, is advanced the center or lead drill will 'Iirst act and l'orin a hole, so that the center or lead drill furnishes a guide and bearing by which the main drill head, with the main cut-ters or bits thereon, will be held eilect-ively in position to operate, and willvbe guided by the advance oi' the center or lead drill in a direct line. The center or lead drill acts as a bearing and retaining point i'or the main drill head, and its cutters or bits, by which the main drill head with its cutters or bits can be operated to drill overlapping holes, thus removing the material in acontinuous line andJ enabling the drill to make 'a clear cut by which a block or section of material can be removed, without the use of any other tool than the drill itself.

It will be understood head can be of other shape than one having two opposite wings, s0 long as the shape is of a nature to furnish an acting end carrying a main cutter or bit; and that, instead of having the main cutters or bits removable, such cutters or bits-could be formed integral or permanent with the acting end of the main drill head, and this without departing from the feature oi`construction in which a center or lead bit acts' in advance ofthe main cutter or bit, so as to furnish a bearing for setting and holding the main drill head and its bits or cutters in position to drill ovcrla ping holes or otherwise. The use of detac iable blades or cutters enables a worn out blade or cutter to be removed to be thrown away and replaced by a new blade or) cutter; and also enables a dull blade or cutter to be taken out and resharpened, either operation being easily performed by sim ly withdrawing the center or lead drill a su cient distance to remove and replace the cutters or blades,and after re lacing again advancing the center or lead dril into locking position. lThe center or lead drill can also be removed for resharpening or replacing a worn out drill or bit.`

What I claim as new and desire to secure by Letters `Patient is:

1. In a drill, the combination of a drill head having opposite wings of segmental ormation extending longitudinally of the head and opposite longitudinal channels between the wings, each wing having therein a longitudinal passage for a medium under pressure,

,said passage having a discharge mouth at theacting end of the wing, the drill head further having in its center a hole or passage, a plurality ot detachable cutters, each provided withA an inner lug entered into the central hole or passage, and acentral or vlead Idrill provided with a shoulder or abutment and entered into the central passage in position to bring the shoulder or Vabutment into engagcment-with the inner ends of the detachable cutters ior clamping the same 1n place, substantially as described.

In a drill, the conibinationof a 'drillhead having opposite wings of segmental formation extending longitudinally ot thc head and opposite longitudinal channels between l the wings, each wing having therein a longitudinal passage ior a medium under pressure, said passage having a discharge mouth at the acting end oi the wing, the drill head further having in its center a hole or passage, a plurality oi detachable cutters, each provided with an inner lugl entered into the central hole or passage, and an outer lug engaging the outer face ot the ldrill head, anda center or lead drill enteredy into the central hele or that'the main drill passage and provided with a shoulder or abutment adapted to enga e the inner ends of the -detachable cutters lor clamping the same in place, substantially as described.

3. In a drill, the combination of a drill head having oppositel disposed Wings 'of se mental formation andy between the wings, the drill head being rovided W'ith a central hole or passage, radially arranged cross heads formed on the acting face of the drill head, each of the cross heads being provided with a groove or channel, removable cutters set Within the channels and provided with inner lugs for engagement with the drill head, and a lead bit provided with a shoulder or abutment adapted to engage the inner ends of the removable cutters for clamping the same in place, substantially as descrlbed.-

4. In a drill, the vcombination of a drill head lhaving oppositely ldisposed AWings of segmental formation and lintermediate channels between the Wings, each of the Wings having formed therein a'V longitudinally extending passage opening through the acting face of the Wing, the drill head being provided With a central hole or passage, radially arranged cross heads formed on the acting face of the drill head, each of the cross heads being provided With a groove or channel, removable cutters set Within the channels and provided with inner lugs for engagement with the drill head, and a lead bit provided with a shoulderor abutment adapted to engage the inner ends of the removable cuttersffor clamping described. y

5.- In a dril1,' the combination of a drill head having oppositely disposed Wings of segmental formation and intermediate' channels between the wings, each of the wings having formed therein a longitudinally extending passage opening through the acting face of the Wing, ,the drill head being provided with a central hole or passage, radially arranged cross heads formed on the act' face of the drill head, each of the cross heads being provided With-a groove or channel, re-

intermediate channe s vsubstantially as the same in place, substantially as With the drill head, outer lugs on the cutters for engaging the outer ends of the cross heads, and a central lead bit provided with an abutment adapted to engage the inner ends of the cutters for 4clam ing the same in position,

described.

6. In a drill, Athe combination of a drill head having opposite wings extending longitudinally of the head, longitudinal channels between-the wings, each Wing having a longitudinal passage formed therein, and the drill head being provided With a central passage, radially extending cross heads formed on the acting fac-e ofthe bit, each of the heads being provided vwith a channel, removable cutters set edgewise Within the channels and each provided with an inner lug entered into the central passage, and provided with an outer lug engaging the outer end of the cross head, and a lead bit entered into the central assage and provided with a shoulder or a ut- 'ment for engaging the inner ends of the cutters, substantially as described.

7. In a drill', the combination of a drill head having opposite Wings extending longitudinally of the head, longitudinal channels between the Wings, each Wing having a longitudinal passage formed therein, and the drill head being provided with a central passage, radially extendin cross heads formed on the acting face of the'flait, each of the heads being provided with a channel, removable cutters. 'set edgewise within the channels and each provided with an inner lug entered into the central passage, Vand provided With an outer lug engaging the outer end of the cross head,

and a lead bit entered into the central passage and provided with a shoulderor abutment for engaging the inner ends of the cutters, the lead bit, being provided with a longitudinal as* sag'e in its center, substantially asdescril ed.

MARTIN HARDsooG. I Witnesses:

W. A. WORK, ALTA GRAY.

Images