EP1074350A1 - Dispositif extracteur - Google Patents

Dispositif extracteur Download PDF

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Publication number
EP1074350A1
EP1074350A1 EP99306067A EP99306067A EP1074350A1 EP 1074350 A1 EP1074350 A1 EP 1074350A1 EP 99306067 A EP99306067 A EP 99306067A EP 99306067 A EP99306067 A EP 99306067A EP 1074350 A1 EP1074350 A1 EP 1074350A1
Authority
EP
European Patent Office
Prior art keywords
extractor
fixing
driver
tool
extractor device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99306067A
Other languages
German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems PLC
Original Assignee
British Aerospace PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Aerospace PLC filed Critical British Aerospace PLC
Priority to EP99306067A priority Critical patent/EP1074350A1/fr
Publication of EP1074350A1 publication Critical patent/EP1074350A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C11/00—Nail, spike, and staple extractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same

Definitions

  • the present invention relates to a device for extracting fixings, such as bolts and the like, from a workpiece.
  • An extractor device generally designated 2
  • the extractor rod 6 has a threaded stem 8 which projects through a hole in the top of the housing 4.
  • a nut 10 is carried by the stem 8 and abuts the exterior of the housing 4.
  • the extractor rod 6 has a head 12 in which there is provided a slot 14 adapted to receive the head of a bolt 16.
  • the bolt 16 is tapped out a short way so that its head stands proud of the wing skin 18.
  • the extractor device 2 is positioned over the bolt 16 such that the head is received in the slot 14.
  • the stem 8 is then drawn out through the housing 4 by turning the nut 10 on the thread.
  • Drawbacks with this present system include the fact that a differently sized and configured rod head is required for differently sized bolts and hence a stock of different extractors therefore needs to be kept to enable the withdrawal of any size of bolt. It has been found that the high tensile forces often experienced in withdrawing bolts from their holes has led to damage to the extractor rod thread, with the result that the whole extractor rod has to be scrapped often after only a very short life. Additionally, the use of the extractor device described above is awkward and slow, in particular when work is being done to an in-service aircraft and the bolt being extracted from a wing is located above the operator's head. A combination of the high torque required to be applied to the nut 10 when removing a stubborn bolt, and the often awkward location of the bolt can often lead to movement of the housing, during an extraction operation, which in turn can lead to damage to the wing skin surface.
  • an extractor device for extracting a fixing from a work piece, the extractor device including an extractor tool adapted to receive the fixing, and a driver connected to the extractor tool, the driver being adapted to exert an extraction force on the fixing via the extractor tool.
  • the extraction force is preferably a vibratory extraction force.
  • the driver may include a driver housing and a mandrel moveable relative to the housing. Movement of the mandrel relative to the housing so as to provide, in use, the extraction force may be effected for example electrically, mechanically, hydraulically and/or pneumatically.
  • the extractor device includes an abutment member adapted to abut the workpiece.
  • the extractor tool may be provided in the housing.
  • the abutment member engages the driver housing, preferably in abutting relationships thereto, and the mandrel is connectable to the extractor tool.
  • a tool for extracting a fixing from a workpiece comprising a carrier member and a engagement member adapted to receive the fixing, the carrier member and engagement member being retainable in association with one another such that, in use, an extraction force applied to the carrier member is transmitted through the engagement member to the fixing.
  • the carrier member and engagement member are retainable in association with one another by a form locking arrangement.
  • the engagement member may be carried in a recess of the carrier member, and the engagement member may correspond to the shape of the recess.
  • the engagement member is adapted to receive a head of the fixing at an engagement location.
  • the engagement location may be at least partially shaped so as to correspond to the head of the fixing.
  • an extractor device for extracting a fixing from a workpiece
  • the extractor device including an extractor tool adapted to receive a fixing, and a driver connected to the extractor tool, the driver being adapted to exert a preferably vibratory extraction force on the fixing via the extractor tool, and the tool comprising a carrier member and a engagement member adapted to receive the fixing, the carrier member and engagement member being retainable in association with one another such that, in use, the extraction force applied to the carrier member is transmitted through the engagement member to the fixing.
  • a fourth aspect of the present invention there is provided a method of extracting a fixing from a workpiece such as an aircraft component, the method comprising the steps of:
  • the rod 20 comprises a stem 24 having a head 26 at one end and a threaded portion 28 at the other.
  • the threaded portion 28 is adapted to fit a fluid operated hand-tool, the use of which is described in greater detail below.
  • the head 26 has a substantially cubic form with the stem 24 extending from an upper face 30 thereof.
  • a rounded blind aperture 32 is provided in the head 26.
  • the aperture 32 extends in a direction perpendicular to the longitudinal axis of the rod 20 between opposing side faces 34,36 of the head 26.
  • a slot 38 communicating with the aperture 32 is provided in the lower face 40 of the head 26. As can be seen from figure 2a the slot 38 extends from an edge of the head 26 to the middle of the lower face 40.
  • Figures 3a to 3b show an insert 22 adapted to fit into the aperture 32 of an extractor rod 20.
  • the insert 22 is a corresponding cross-sectional shape to that of the aperture 32 and is sized so as to be a sliding fit within the aperture 32.
  • a blind hole 42 is provided in one end face 44 of the insert 22.
  • a slot 46 narrower than the slot 38 in the head 40, is provided in the insert 22. The interior surface of the hole 42 on either side of the slot 46 is chamfered so as to provide an engagement surface.
  • an insert 22 having a slot 46 which is sized and a chamfer which is angled to cooperate with a particular size of fixing 82 to be removed, is placed in the aperture 32 of the head 40 and the respective slots 36,46 of the two components align with one another.
  • the rod and insert 20,22 can then be positioned relative to a screw, bolt or like fastener such that the head of the fastener is received within the insert 22.
  • the chamfered portions of the insert 22 correspond to the shape of a countersunk screw head, and thus ensure that there exists line, as opposed to point, contact between the screw head and the insert 22.
  • the above described insert 22 and rod 20 arrangement has the advantage that a single rod 20 can be supplied with a plurality of interchangeable inserts 22 configured so as to accommodate the head size and countersink angle of a range of fasteners.
  • the time taken in removing and replacing an insert 22 is less than that taken changing a conventional single piece extractor rod. Additionally if an insert 22 is worn or damaged then only it, and not the entire rod 20, usually needs to be replaced.
  • the device 50 comprises an extractor rod 52, a cylindrical body 54 and a driver 56.
  • the extractor rod 52 is of a conventional single piece construction having a head 58 and a stem 60 extending therefrom.
  • the head 58 of the rod 52 is provided with an aperture 78 and slot 80 adapted to receive the head and shank of a fixing 82 as described above.
  • the driver 56 is in the form of a fluid operable hand tool or gun.
  • the gun has a barrel 62 within which is housed an elongate adapter rod 64.
  • the free end 66 of the adapter rod 64 is threaded.
  • the gun When connected to a supply of pressurised fluid, the gun can be operated to draw the adapter rod 64 through the barrel 62 with a vibratory motion.
  • the cylindrical body 54 is substantially hollow and is adapted to, in use, accommodate the head 58 of the extractor rod 52.
  • a hole 68 through which the stem 60 of the extractor rod 52 can project is provided in the top 70 of the body 54.
  • a peripheral flange 72 provided around the bottom 74 of the body 54 defines a seat which rests against a work piece 76, in use.
  • a cutaway portion 84 of the cylindrical body 54 allows fixings 82 to be fitted to and removed from the head 58 of the extractor rod 52.
  • a runner 86 made from, for example, brass is provided within the cylindrical body 54 opposite the cutaway portion 84 to maintain orientation of the extractor rod 52 with respect to the body 54.
  • the cylindrical body 54 is connected to the barrel 62 by an adjustable adapter 88, and the extractor rod 52 is threaded to the adapter rod 62 such that the aperture 78 of the head 58 is aligned with cutaway portion 84 of the cylindrical body 54.
  • the extractor device 50 is then positioned such that a fixing 82 is received in the aperture 78 as shown in figure 4.
  • the adaptor 88 can be adjusted to take up any slack between the head 58 of the extractor rod and a head 90 of the fixing 82, the driver 56 is then operated so as to draw the adapter rod 64 and extractor rod 52 through the barrel 62 with a vibratory motion and thereby extract the fixing 82.
  • the flange 72 of the cylindrical body bears against the workpiece 76 during extraction of the fixing 82 and spreads the reactive load experienced during extraction so as not to distort or damage the surface of the workpiece 76. It will be appreciated that the act of extracting the fixing imparts no relative torque between the flange 72 and workpiece and so greatly cuts down the risk of damage to either the tool or the workpiece. In addition, the likelihood of any fretting between the tool and workpiece is also reduced by the speed and precision with which a fixing can be removed, according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
EP99306067A 1999-07-30 1999-07-30 Dispositif extracteur Withdrawn EP1074350A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99306067A EP1074350A1 (fr) 1999-07-30 1999-07-30 Dispositif extracteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99306067A EP1074350A1 (fr) 1999-07-30 1999-07-30 Dispositif extracteur

Publications (1)

Publication Number Publication Date
EP1074350A1 true EP1074350A1 (fr) 2001-02-07

Family

ID=8241555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99306067A Withdrawn EP1074350A1 (fr) 1999-07-30 1999-07-30 Dispositif extracteur

Country Status (1)

Country Link
EP (1) EP1074350A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007091883A1 (fr) * 2006-02-07 2007-08-16 Van Baal & Partners Dispositif et procede pour liberer une liaison bloquee

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB127673A (en) * 1917-05-22 1919-06-12 Sopwith Aviat Company Ltd An Improved Toof for Extracting the Fixing Bolts of the Propellers of Aeroplanes and other Aircraft.
US2452457A (en) * 1945-09-18 1948-10-26 Griffin W Gray Bolt puller
WO1988002246A2 (fr) * 1986-09-26 1988-04-07 Dicecca Charles A Procede et dispositif d'extraction et d'introduction d'articles noyes, y compris des dispositifs pour protheses et implants osseux
DE8803981U1 (de) * 1987-04-10 1988-06-01 Sankyo Oilless Industry GmbH, 4010 Hilden Stiftzieher
WO1997016281A1 (fr) * 1995-10-31 1997-05-09 Perin Nolan A Extracteur de boulons et de chevilles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB127673A (en) * 1917-05-22 1919-06-12 Sopwith Aviat Company Ltd An Improved Toof for Extracting the Fixing Bolts of the Propellers of Aeroplanes and other Aircraft.
US2452457A (en) * 1945-09-18 1948-10-26 Griffin W Gray Bolt puller
WO1988002246A2 (fr) * 1986-09-26 1988-04-07 Dicecca Charles A Procede et dispositif d'extraction et d'introduction d'articles noyes, y compris des dispositifs pour protheses et implants osseux
DE8803981U1 (de) * 1987-04-10 1988-06-01 Sankyo Oilless Industry GmbH, 4010 Hilden Stiftzieher
WO1997016281A1 (fr) * 1995-10-31 1997-05-09 Perin Nolan A Extracteur de boulons et de chevilles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007091883A1 (fr) * 2006-02-07 2007-08-16 Van Baal & Partners Dispositif et procede pour liberer une liaison bloquee

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