US3015240A - Drill attachment - Google Patents

Drill attachment Download PDF

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Publication number
US3015240A
US3015240A US848347A US84834759A US3015240A US 3015240 A US3015240 A US 3015240A US 848347 A US848347 A US 848347A US 84834759 A US84834759 A US 84834759A US 3015240 A US3015240 A US 3015240A
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Prior art keywords
barrel
section
drill
barrel section
ring
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Expired - Lifetime
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US848347A
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Carl D Hodnett
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B47/00Constructional features of components specially designed for boring or drilling machines; Accessories therefor
    • B23B47/28Drill jigs for workpieces
    • B23B47/284Jigs for drilling rivets or bolts
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/55Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
    • Y10T408/559Funnel like work-engaging surface cooperating with protuberance on work
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/55Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
    • Y10T408/564Movable relative to Tool along tool-axis
    • Y10T408/5653Movable relative to Tool along tool-axis with means to bias Tool away from work

Definitions

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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

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
US848347A 1959-10-23 1959-10-23 Drill attachment Expired - Lifetime US3015240A (en)

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3180183A (en) * 1962-10-12 1965-04-27 Royal Mcbee Corp Drilling machine with laterally indexable head
US4012161A (en) * 1974-05-15 1977-03-15 Shultz William E Rotary cutting device
JPS546699U (en) * 1977-06-16 1979-01-17
US4544307A (en) * 1983-05-31 1985-10-01 Miller Aaron B Drilling jig for flathead screw pilot holes
US4588334A (en) * 1984-09-07 1986-05-13 Lockheed Corporation Adjustable clocking nose piece
US4759666A (en) * 1986-11-12 1988-07-26 Grab Joseph A Drill guides and apparatus for holding same
US4961674A (en) * 1989-07-21 1990-10-09 Wang Edward A Drill guide for precise drilling
US4986702A (en) * 1990-04-20 1991-01-22 The Boeing Company Fastener collar remover
US5318390A (en) * 1993-01-22 1994-06-07 Dalbianco Mario Tool for removing rivets
US5692286A (en) * 1995-10-02 1997-12-02 Posulax S.A. Method for shaping parts in one or more stacked board shaped elements and machine tool for implementing this method
US5893684A (en) * 1996-07-01 1999-04-13 Raytheon Company Removal tool for flush rivets
US6092964A (en) * 1998-05-20 2000-07-25 Textron Inc. Rivet removal tool and method
WO2004082878A1 (en) * 2003-03-20 2004-09-30 Nishida, Hiromi Power tool head and power tool
US20070071562A1 (en) * 2005-09-23 2007-03-29 Spitznagel Max W Drill motor assembly for drilling out rivets
US20080112768A1 (en) * 2006-10-05 2008-05-15 The Boeing Company Method and Device for Clamping and Machining
US20080260484A1 (en) * 2007-04-20 2008-10-23 Benito Grille Sacaluga Milling headstock for rivet stems
US20090088886A1 (en) * 2007-09-28 2009-04-02 Benito Grille Sacaluga Milling head in tricepts with electro-mechanical depth control
US20120011908A1 (en) * 2010-07-16 2012-01-19 Inner-Tite Corp. Key mechanism
US20130134206A1 (en) * 2011-11-25 2013-05-30 Helmholtz-Zentrum Geesthacht Zentrum für Material - und Küstenforschung GmbH Self-clamping friction welding tool
WO2014056678A1 (en) * 2012-10-11 2014-04-17 Bayerische Motoren Werke Aktiengesellschaft Attachment device for a boring system and boring system for boring a connection element
US20150258601A1 (en) * 2014-03-12 2015-09-17 Airbus Operations Gmbh Drilling-out aid device for assisting in drilling out a rivet
US20170056982A1 (en) * 2015-08-25 2017-03-02 Jay L. Sussman Nail head removal tool
FR3041277A1 (en) * 2015-09-18 2017-03-24 Etablissements Dubourgel Grange FIXING BREAKING DEVICE
CN106984764A (en) * 2017-05-05 2017-07-28 浙江亿洋智能装备科技股份有限公司 A kind of automatic rivet removal frock
CN109894566A (en) * 2019-04-12 2019-06-18 江铃汽车股份有限公司 A kind of automobile rivet, which bores, removes equipment
FR3114985A1 (en) * 2020-10-12 2022-04-15 Alex Grojean Equipment, device and method for dismantling an upper part and a lower part assembled by a welded insert.
US20220395913A1 (en) * 2021-06-14 2022-12-15 Gregory T. Melartin Drill bit guide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510482A (en) * 1938-05-30 1939-08-02 Roe A V & Co Ltd Improvements in rivets and tools for removing rivets
US2375112A (en) * 1943-11-13 1945-05-01 William J Kanihan Rivet remover
FR916987A (en) * 1945-07-05 1946-12-20 Drill accessory

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510482A (en) * 1938-05-30 1939-08-02 Roe A V & Co Ltd Improvements in rivets and tools for removing rivets
US2375112A (en) * 1943-11-13 1945-05-01 William J Kanihan Rivet remover
FR916987A (en) * 1945-07-05 1946-12-20 Drill accessory

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3180183A (en) * 1962-10-12 1965-04-27 Royal Mcbee Corp Drilling machine with laterally indexable head
US4012161A (en) * 1974-05-15 1977-03-15 Shultz William E Rotary cutting device
JPS546699U (en) * 1977-06-16 1979-01-17
US4544307A (en) * 1983-05-31 1985-10-01 Miller Aaron B Drilling jig for flathead screw pilot holes
US4588334A (en) * 1984-09-07 1986-05-13 Lockheed Corporation Adjustable clocking nose piece
US4759666A (en) * 1986-11-12 1988-07-26 Grab Joseph A Drill guides and apparatus for holding same
US4961674A (en) * 1989-07-21 1990-10-09 Wang Edward A Drill guide for precise drilling
US4986702A (en) * 1990-04-20 1991-01-22 The Boeing Company Fastener collar remover
US5318390A (en) * 1993-01-22 1994-06-07 Dalbianco Mario Tool for removing rivets
US5692286A (en) * 1995-10-02 1997-12-02 Posulax S.A. Method for shaping parts in one or more stacked board shaped elements and machine tool for implementing this method
US5893684A (en) * 1996-07-01 1999-04-13 Raytheon Company Removal tool for flush rivets
US6092964A (en) * 1998-05-20 2000-07-25 Textron Inc. Rivet removal tool and method
WO2004082878A1 (en) * 2003-03-20 2004-09-30 Nishida, Hiromi Power tool head and power tool
US20070071562A1 (en) * 2005-09-23 2007-03-29 Spitznagel Max W Drill motor assembly for drilling out rivets
US20080112768A1 (en) * 2006-10-05 2008-05-15 The Boeing Company Method and Device for Clamping and Machining
US8210778B2 (en) * 2006-10-05 2012-07-03 The Boeing Comapny Method and device for clamping and machining
US20080260484A1 (en) * 2007-04-20 2008-10-23 Benito Grille Sacaluga Milling headstock for rivet stems
US20090088886A1 (en) * 2007-09-28 2009-04-02 Benito Grille Sacaluga Milling head in tricepts with electro-mechanical depth control
US20120011908A1 (en) * 2010-07-16 2012-01-19 Inner-Tite Corp. Key mechanism
US8365559B2 (en) * 2010-07-16 2013-02-05 Inner-Tite Corp. Key mechanism
US20130134206A1 (en) * 2011-11-25 2013-05-30 Helmholtz-Zentrum Geesthacht Zentrum für Material - und Küstenforschung GmbH Self-clamping friction welding tool
US8714431B2 (en) * 2011-11-25 2014-05-06 Helmholtz-Zentrum Geesthacht Zentrum für Material—und Küstenforschung GmbH Friction stir welding tool
WO2014056678A1 (en) * 2012-10-11 2014-04-17 Bayerische Motoren Werke Aktiengesellschaft Attachment device for a boring system and boring system for boring a connection element
US20150258601A1 (en) * 2014-03-12 2015-09-17 Airbus Operations Gmbh Drilling-out aid device for assisting in drilling out a rivet
US20170056982A1 (en) * 2015-08-25 2017-03-02 Jay L. Sussman Nail head removal tool
US10058931B2 (en) * 2015-08-25 2018-08-28 Jay L Sussman Nail head removal tool
FR3041277A1 (en) * 2015-09-18 2017-03-24 Etablissements Dubourgel Grange FIXING BREAKING DEVICE
CN106984764A (en) * 2017-05-05 2017-07-28 浙江亿洋智能装备科技股份有限公司 A kind of automatic rivet removal frock
CN109894566A (en) * 2019-04-12 2019-06-18 江铃汽车股份有限公司 A kind of automobile rivet, which bores, removes equipment
FR3114985A1 (en) * 2020-10-12 2022-04-15 Alex Grojean Equipment, device and method for dismantling an upper part and a lower part assembled by a welded insert.
US20220395913A1 (en) * 2021-06-14 2022-12-15 Gregory T. Melartin Drill bit guide

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