Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2237901 A
Publication typeGrant
Publication dateApr 8, 1941
Filing dateOct 7, 1938
Priority dateOct 7, 1938
Publication numberUS 2237901 A, US 2237901A, US-A-2237901, US2237901 A, US2237901A
InventorsWilliam A Chun
Original AssigneeWilliam A Chun
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Drill
US 2237901 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

April 8, 1941, w A CHUN 2.237 901 DRILL Filed Oct. 7, 1958 Patented Apr. 8, 1941 UNITED STATES PATENT OFFICE DRILL William A. Chun, Houston, Tex.

Application October 7, 1938, Serial No. 233,752

Claims. (CI. 77-68) This invention relates to a drill and has particular relation to a novel type of twist drill particularly designed for use in drilling metal.

An object of the invention is to provide a drill of the stub, spiralled type having replaceable cutting blades which may be quickly changed, for renewal and having channels for cooling fluid through which the fluid may be cast on the front cutting edges of the blades.

Another object of the invention is to provide a drill of the character described having specially formed spiralled flutes for the delivery of the cuttings and wherein the cuttings will not congest and choke.

Another object of the invention is to provide a drill of the character described having adrive shaft, or shank, which may be formed integrally with, or detachable from the body of the tool and which is smaller in diameter than said body to provide space above the body to receive the cuttings and whereby the cuttings may be effectively lifted and removed from the bore upon removal of the drill.

It is another object of the invention to provide a drill of the character described having a relatively thick sturdy body whose bore engaging surfaces are coated with a substantially frictionless hard material.

It is another object of the invention to provide a drill having a spirally fluted body which is so formed as to provide a strong substantial core containing ample material to give unusual strength to this type of drill so that it will not be liable to be twisted ofi under heavy duty.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use, examples of which are given in this specification and illustrated in the accompanying drawing, wherein:

Figure 1 shows a side elevation of the drill having a detachable shank, or driving shaft, shown in section.

Figure 2 shows a forward end view.

Figure 3 shows a side elevation taken at right angles to the view shown in Figure 1 showing the driving shaft or shank integral with the body of the tool.

Figure 4 shows a cross-sectional view taken on i the line 4-4 of Figure 3.

Figure 5 shows a cross-sectional view taken on the line 5-5 of Figure 3.

Figure 6 shows a side view of a cutting blade employed.

Figure 7 shows an end view thereof.

Figures 8 and 9 show side and edge views of another form of cutting blade, and

Figures 10 and 11 show a forward end view and a side elevation, respectively, of still another form of cutter that may be employed.

Referring now more particularly to the drawing wherein like numerals of reference designate the same parts in each of the figures, the numeral l designates the body of the tool. This body is of a general cylindrical form having a tapering, or conical, forward end face 2.

The body is formed with oppositely disposed grooves or flutes 3, 3 leading from the conical forward end face 2 to the opposite, or upper end of the body. These flutes are provided to serve as passageways for the cuttings upwardly into the space above the body as the work progresses and they are gradually widened upwardly to prevent congestion of the cuttings. The numeral 4 designates a driving shaft, or shank. This shaft may be of any desired length depending on the type of work to be performed and, as shown in Figure 1, it is detachable from the body. To provide for this detachment the body has a reduced outwardly threaded pin on its upper end on to which the adjacent end of the shank is threaded. The pin 5, adjacent the body is enlarged forming a blank extension which is snugly received by the smooth bore 1 of the shank, when the shank is screwed home, thus conducing to strength.

In the form shown in Figure 3 the shank 4a is formed integrally with the body. The shank, pin 5 and body are provided with an axial water course 8 extending therethrough to the forward end of the body as shown in Figures 1 and 4.

The forward end of the body is provided with a transverse, relatively deep, slot 9 to receive the transverse cutter blade ID. This cutter blade is seated snugly in said slot and its inner end is formed with a tenon I l which extends up into the water course 8, as shown in dotted lines in Figure 1. The opposite edges of the tenon l l are curved, as shown in Figure 7, to conform to the curvature of, and to fit snugly in, said water course of the head, and the tenon I l is of somewhat less transverse diameter than the inside diameter of the water course thus providing water passageways l2, as shown in Figures 2 and 4, along side the blade, one on each side, extending entirely to the forward end of the head. This is also indicated in dotted lines in Figure 1.

The cutter blade l0 terminates in the forwardly converging cutting edges 13, I3 and the flutes, or

channels 3, 3 have their forward ends located in front of the corresponding cutting edges l3 so that the cuttings will be delivered into said flutes. The cutter blade may be anchored to the body by means of suitable set screws H5, H1 therethrough which are screwed into the body as shown in Figure 4. The cooling fluid will be discharged through the pasageways 12 onto the point of the cutter I0.

Diverging downwardly from the water course 8, on opposite sides of the body are the upper and lower branches l5, IS the former of which are directed toward the side reaming edges ll of the cutter and the latter of which are directed toward the outer ends of the cutting edges l3. The cooling fluid will thus be delivered directly onto the cutting edges where the work is most severe so as to keep the same cool to the end that they will not be deteriorated by excessive heat.

The bore engaging surfaces (8, 18 of the head, that is, that portion of the head between the flutes are provided with a coating of hard frictionless material which will greatly reduce the friction between the body and the walls of the bore being formed.

While drilling the cuttings will be carried along the flutes 3 into the bore around the driving shaft, or shank 4, or id, which being reduced in diameter, are of a less diameter than that 9 of the body, to provide ample space for said cuttings and when the drill is withdrawn from the bore the major portion of the cuttings accumulating in the bore will be engaged by the adjacent end of the body and will be withdrawn from the bore made by the drill.

It is to be noted that the bottom of each flute is convex throughout the length of the flute as more clearly shown in Figure 5. This construction provides sufiicient material to form a very strong core for the body which will readily withstand any torsional strain to which the drill is likely to be subjected.

The blade used may be of any selected type, for example the blade Illa, is provided on its forward end with a spindle I9 surrounded by a bushing 20 retained in place by the circular retainer plate 2| which is fastened onto the outer end of the spindle by means of a set screw 22.

This type of blade may be inserted into the slot 9 and secured therein in the manner illustrated in Figure 4 and in use, the spindle is inserted into the outer end of a bore previously formed and upon operation of the tool, the cutting edges lllb of the blade, will form a smooth face around the outer end of the bore, as is necessary in certain types of work.

Another type of blade as lDc is illustrated in Figures 8 and 9. This type is similar to the blade I!) shown in Figures 1 and 2, with the exception that its cutting edges lllb are in stepped relation as clearly illustrated in Figure 8. This type of blade is secured in place in the same manner as the type shown in Figures 1 and 2.

The cutter illustrated in Figures 10 and 11 is shaped to form a bore which is annular in cross section. The shank or blade portion We is fitted into and secured in the slot 9 as illustrated in Figure 4. The forward portion of the cutter has a substantially tubular body 23 and its forward end terminates in the forwardly directed cutting edges 24 spaced apart therearound and arranged, when applied to the work, to form a bore which is annular in cross section.

The drawing is illustrative merely. Changes in the mechanical design of the tool may be made, as is obvious, the broad principle of the invention being defined by the appended claims.

What I claim is:

1. A drill comprising a body, a shank of less diameter than the body for driving the body, said shankand body having an axial water course therethrough and the forward end of the body having a transverse slot, a blade detachably secured in the slot, the diameter of the passageway through the body being greater than the minor diameter of the blade and said passageway forming outlets for a cooling fluid along opposite sides of the blade, said passageway having upper and lower, approximately parallel branches disposed to cast the cooling fluid in front of the blade on opposite sides of the body.

2. A drill comprising a body having an axial water course therethrough from end to end, the forward end of the body having a transverse slot, a blade secured in the slot and positioned to divide the passageway into separate channels one on each side of the blade.

3. A drill comprising a body having an axial water course therethrough from end to end, the forward end of the body having a transverse slot, a blade secured in the slot and positioned to divide the passageway into separate channels one on each side of the blade, said blade having forward end cutting edges and side cutting edges and said body having upper and lower branches leading from said passageway and disposed to cast a cooling fluid in front of the side cutting edges and at the outer ends of the end cutting edges.

4. A drill comprising an approximately cylindrical body having spiralled side flutes and an axial bore extending from end to end thereof and having a transverse slot at its forward end, a cutting blade having side and front cutting edges detachably secured in the slot by means of screws and a tenon on the inner end of the blade fitted in the passageway, said blade and tenon being shaped to allow a limited flow of fluid from the bore around the tenon and blade, the bottom of each flute being convex throughout the length of the body, said body having channels on opposite sides thereof connected to said core and disposed to cast fluid in front of the cutting edges of the blade at the side cutting edges and at the outer ends of the end cutting edges.

5. A drill comprising a short approximately cylindrical body having spiralled side flutes extending from end to end thereof, the body having a coating of hard facing material, a detachable blade on the forward end of the body having forward and side cutting edges, a portion of the body being relieved and. forming a. rim on the forward edges of the body between the flutes, the diameter of the body at the rims being equal to the width of the blade, said relief being very slight so that the body as Well as the rims will act as bearing faces 01' stabilizers to resist movement of the blade away from the metal cut.

WILLIAM A. CHUN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2555302 *Aug 25, 1947Jun 5, 1951Floyd F CogsdillTwist drill
US2817983 *Mar 2, 1956Dec 31, 1957Carl W MossbergCoolant type drilling tool
US3028772 *Jul 31, 1959Apr 10, 1962Carl W MossbergLiquid cooled counter-boring tool
US3037264 *Sep 8, 1959Jun 5, 1962Mossberg Carl WCoolant type milling cutter
US3054308 *Nov 15, 1960Sep 18, 1962Star Cutter CompanyDrill
US3085453 *May 27, 1960Apr 16, 1963Mossberg Carl WMethod of preforming a coolant type drill
US3096668 *Apr 25, 1962Jul 9, 1963Harlan J MaynardMist cooled cutting tool
US3293727 *Apr 12, 1961Dec 27, 1966Bilt Rite Tool & Machine CoCutting tool
US3436990 *Dec 27, 1965Apr 8, 1969Asher TourisonSpade drill
US3460410 *Aug 7, 1967Aug 12, 1969Briles Franklin SReamer
US3861011 *Aug 27, 1973Jan 21, 1975Sumitomo Electric IndustriesMilling cutter
US4047826 *May 17, 1976Sep 13, 1977Bennett John TDrill having indexable replaceable insert tip
US4189266 *Aug 5, 1977Feb 19, 1980George KoslowRotary drill bit for hand-held power drills
US4493596 *Dec 17, 1982Jan 15, 1985Stellram S.A.Rotary material removing tool
US4565473 *Feb 14, 1984Jan 21, 1986Toshiaki HosoiDrill
US4620822 *May 21, 1985Nov 4, 1986General Electric CompanyFlat bottom hole drill
US4621547 *Aug 5, 1985Nov 11, 1986Yankoff Gerald KMethod and apparatus for machining
US4684298 *May 16, 1986Aug 4, 1987Santrade LimitedDrill
US4695208 *Nov 14, 1985Sep 22, 1987Yankoff Gerald KTool holder
US4744704 *Jan 22, 1987May 17, 1988Santrade LimitedDrill
US5114286 *Aug 13, 1991May 19, 1992Calkins Donald WInterchangeable tool alignment system
US5174692 *Oct 22, 1991Dec 29, 1992Aerospatiale Societe Nationale IndustrielleDrilling tool and apparatus with improved swarf removal
US5338135 *Apr 9, 1992Aug 16, 1994Sumitomo Electric Industries, Ltd.Drill and lock screw employed for fastening the same
US5474407 *Jan 25, 1995Dec 12, 1995Stellram GmbhDrilling tool for metallic materials
US5725337 *Jun 16, 1995Mar 10, 1998Cochran; Donald PaulSelf centering spade drill
US5918105 *Nov 12, 1996Jun 29, 1999Black & Decker Inc.Cutting tools for drilling concrete, aggregate, masonry or the like materials
US5957635 *Aug 21, 1998Sep 28, 1999Allied Machine & Engineering Corp.Drill tool assembly
US5967711 *Mar 10, 1998Oct 19, 1999Cochran; Donald PaulSelf-centering spade drill
US6071045 *May 6, 1998Jun 6, 2000Janness; DanielCutting insert and tool
US6102634 *Jul 25, 1996Aug 15, 2000Black & Decker Inc.Masonry drill bit
US6174111Apr 22, 1997Jan 16, 2001Black & Decker Inc.Cutting tools for drilling concrete, aggregate, masonry or the like materials
US6406226 *Mar 27, 2001Jun 18, 2002Kyocera CorporationThrowaway tip and drill holder
US6481938 *Mar 19, 2001Nov 19, 2002Sandvik AbDrilling tool including a shank and a cutting body detachably secured thereto
US6514019 *Jul 21, 1999Feb 4, 2003Dr. Joerg GuehringBoring tool comprising a replaceable cutting insert which is secured against detaching
US7556458 *Mar 31, 2004Jul 7, 2009Komet Group Holding GmbhTool for machine tools
US7625160Mar 2, 2007Dec 1, 2009Milwaukee Electric Tool CorporationCutting tool
US7661911 *Mar 2, 2007Feb 16, 2010Milwaukee Electric Tool CorporationCutting tool
US8057135 *Nov 19, 2008Nov 15, 2011Greenlee Textron Inc.Auger bit with interlocking feed screw and cutting insert
US8066457 *May 26, 2006Nov 29, 2011Komet Group GmbhMachine tool
US8328477Nov 5, 2008Dec 11, 2012Milwaukee Electric Tool CorporationCutting tool
US8371777Aug 27, 2010Feb 12, 2013Milwaukee Electric Tool CorporationCutting tool
US20090311055 *Oct 4, 2007Dec 17, 2009Vincenzo GalotaMilling tool and method, in particular for milling composite materials
US20110116884 *Mar 19, 2008May 19, 2011Shiqing LiHelical bit tool
DE2523201A1 *May 26, 1975Dec 16, 1976Krupp GmbhBohrwerkzeug
DE3204210A1 *Feb 8, 1982Aug 18, 1983Stellram GmbhWerkzeug zur spangebenden formung
DE9005712U1 *May 19, 1990Jul 26, 1990Hef Technische Entwicklung Gmbh & Co Kg, 4000 Duesseldorf, DeTitle not available
EP0172148A2 *Jul 2, 1985Feb 19, 1986Santrade Ltd.Drill
EP0482982A1 *Oct 18, 1991Apr 29, 1992AEROSPATIALE Société Nationale IndustrielleDevice for drilling with improved chip removal
EP1747831A1 *Jul 27, 2005Jan 31, 2007Yih Troun Enterprise Co., Ltd.Drill bit with multiple stepped cutting edges
WO2000044518A1 *Jan 27, 2000Aug 3, 2000Guenter EberleCutting tool
Classifications
U.S. Classification408/59, 408/233, 407/40, 408/223, 408/227
International ClassificationB23B51/00, B23B51/10, B23B51/02
Cooperative ClassificationB23B51/107, B23B51/02, B23B51/0009, B23B2251/50, B23B51/009, B23B2250/12
European ClassificationB23B51/00C, B23B51/10K, B23B51/02, B23B51/00L