EP0322490A1 - A tool for removing a threaded fastener - Google Patents
A tool for removing a threaded fastener Download PDFInfo
- Publication number
- EP0322490A1 EP0322490A1 EP87311548A EP87311548A EP0322490A1 EP 0322490 A1 EP0322490 A1 EP 0322490A1 EP 87311548 A EP87311548 A EP 87311548A EP 87311548 A EP87311548 A EP 87311548A EP 0322490 A1 EP0322490 A1 EP 0322490A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sleeve
- tool
- broach
- fastener
- bore
- 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.)
- Granted
Links
- 230000002093 peripheral effect Effects 0.000 claims 2
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000001815 facial effect Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
-
- 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
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/005—Screw guiding means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
- Gripping On Spindles (AREA)
- Milling, Broaching, Filing, Reaming, And Others (AREA)
- Drilling And Boring (AREA)
Abstract
Description
- This invention relates to a tool utilised to assist in the removal of fasteners of the type having a head with a recessed socket from a threaded bore when the recessed socket has become so damaged that a normal tool is incapable of insertion and engagement during the attempt to remove the same.
- According to the present invention, a tool for removing a threaded fastener of the type having a head with a recessed socket therein from a threaded bore comprises a sleeve having a bore therethrough; an elongate broach extending through the bore in the sleeve; the cross-section of the broach being polygonal and slightly larger than the recessed socket in the fastener whereby end portions of the broach can be forcefully projected into the recessed socket; the cross-section of the bore in the sleeve being such as to permit relative axial movement between the sleeve and the broach but to prevent relative angular rotation therebetween when a turning force is applied to the sleeve; said sleeve having a projection at one end which is adapted to abut against the countersunk head of a fastener and a recess at the other end which is arranged to fit over the exposed head of a fastener, both the projection and the recess serving to align the broach with the recessed socket of a threaded fastener.
- In utilising the tool of this invention, it is vital that the broach before its forcible insertion into the recessed socket of the fastener head be in longitudinal alignment with the shank of the fastener. To assure this alignment, the sleeve is slidably moved along the broach so that it may either receive in its receptable end the head of the fastener or, alternatively, in the case of a countersunk fastener, be projected into the countersunk bore for flat facial abutment with the exposed complementary flat surface of the head of the fastener. In either of these engagements, the sleeve will function to position and maintain the broach in proper longitudinal alignment during the period of its forceful insertion into the stripped socket of the head of the fastener.
- It should also be noted that, once the broach has operatively been placed in fixed engagement with the socket, the sleeve, by reason of its hexagonal cross-section, is adapted to be readily gripped by a tool, such as a wrench, for imparting rotation to the fastener through the broach.
- In order that the invention may be more readily understood, it will now be described, by way of example only, with reference to the accompanying drawings, in which:-
- Figure 1 is a perspective view of the tool assembly of this invention;
- Figure 2 is a side elevational detailed sectional view of the sleeve of the tool;
- Figure 3 is a perspective view of the elongated broach of the tool;
- Figure 4 is a fragmentary partially sectional detailed view of the tool in use on a countersunk head of a fastener; and
- Figure 5 is a fragmentary partially sectional detailed view of the tool as used on an exposed head of a fastener.
- As illustrated in Figure 1, the
tool 10 of this invention includes an elongatedpolygonal broach 11 and apolygonal sleeve 12. Thesleeve 12 is provided with acentre bore 13, the cross-section of which resembles the polygonal cross-section of thebroach 11 so thatsuch sleeve 12 is freely slidable longitudinally on thebroach 11. - As viewed in Figure 2, the
sleeve 12 has oneend 14 recessed as at 15, with therecess 15 having open communication with theinternal bore 13 of thesleeve 12. It should be noted that the end recess 15 of thesleeve 12 is normally circular in cross-section and of a diameter greater than that of the centre bore 13. - The
opposite end 16 ofsleeve 12 is formed to provide a longitudinally circular projection forming an insert head 17. It should again be noted that thecounter bore 13 extends throughout the length of the insert end 17 by reason of the fact that the diameter of the insert 17 is greater than that of thebore 13. - When the tool is used to extract a countersunk
hex head fastener 18, as illustrated in Figure 4, thesleeve 12 is positioned such that its insert end 17 projects into thecounter bore 19 and sits in facial contact upon the exposed flat head 20 of thefastener 18. In this position, thebroach 11 will be in substantial longitudinal alignment with theshank 21 as well as thehex socket 22 formed in the head 20 of thefastener 18. As thesleeve 12 holds the broach in such alignment, the broach can be forcibly inserted into the strippedhex socket 22 formed in the flat head 20 of thefastener 18. This forceful insertion of thebroach 11 may be accomplished by striking the free standing exposed opposite end with a tool, such as a hammer and the like. When the broach has been forcibly inserted in thehex socket 22, a suitable tool, such as an adjustable wrench, may be clamped upon thesleeve 12 for rotating it, as well as the broach, in an unthreading rotational direction which will be imparted to thefastener 18 so as to effect removal of the same. - In Figure 5, the
tool 10 of this invention is shown in application upon the exposedhead 23 of ahex head fastener 24. In this circumstance the opposite end of thesleeve 12 is aligned with thefastener 24 so that thehead 23 of the fastener is received within therecess 15 formed in theend 14 of thesleeve 12. In such a position, the purpose, function and operation of theco-operating broach 11 andsleeve 12 are similar to that previously described. - From the foregoing it is apparent that an efficient tool for effecting removal of exposed or countersunk stripped head fasteners is provided. The tool may be made in sizes to correspond to the commercially available head fasteners such that the
broach 11 will always possess a configurated diameter slightly larger than the recessed socket in the head of the fastener.
Claims (5)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/060,958 US4716793A (en) | 1985-12-20 | 1987-06-10 | Polygonal tool for removal of stripped hex head fasteners |
AT87311548T ATE92829T1 (en) | 1987-12-31 | 1987-12-31 | TOOL FOR REMOVING THREADED FASTENERS. |
DE87311548T DE3787025T2 (en) | 1987-12-31 | 1987-12-31 | Tool for removing threaded fasteners. |
EP87311548A EP0322490B1 (en) | 1987-12-31 | 1987-12-31 | A tool for removing a threaded fastener |
ES87311548T ES2044961T3 (en) | 1987-12-31 | 1987-12-31 | A TOOL TO DELETE A THREADED FIXING MEDIA. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP87311548A EP0322490B1 (en) | 1987-12-31 | 1987-12-31 | A tool for removing a threaded fastener |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0322490A1 true EP0322490A1 (en) | 1989-07-05 |
EP0322490B1 EP0322490B1 (en) | 1993-08-11 |
Family
ID=8198170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87311548A Expired - Lifetime EP0322490B1 (en) | 1985-12-20 | 1987-12-31 | A tool for removing a threaded fastener |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0322490B1 (en) |
AT (1) | ATE92829T1 (en) |
DE (1) | DE3787025T2 (en) |
ES (1) | ES2044961T3 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4212180A1 (en) * | 1992-03-26 | 1993-09-30 | Audi Ag | Arrangement with screw for fastening of chassis section - has threaded bush with internal and external threads, with polygonal end for tool engagement |
FR2954917A1 (en) * | 2010-01-07 | 2011-07-08 | Peugeot Citroen Automobiles Sa | Screwing/unscrewing device for use in electric tool for screwing/unscrewing screw above hole in recess of equipment of seats of automobile, has base plate including central cavity for housing part of head arranged at fingerprint of screw |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2121197A (en) * | 1936-07-01 | 1938-06-21 | Ridge Tool Company Of Elyria | Screw extractor |
GB1029357A (en) * | 1963-11-12 | 1966-05-11 | Robert Mankovitz | A key spanner and socket combination |
US3587363A (en) * | 1968-10-14 | 1971-06-28 | Monsanto Co | Ball plunger installing and removal tool |
DE2437142B1 (en) * | 1974-05-30 | 1975-09-04 | George Fresno Calif. Brase (V.St.A.) | Tool for loosening broken or worn connecting screws or the like |
CH593116A5 (en) * | 1975-07-08 | 1977-11-30 | Stoba Ag | Tool for releasing defective socket head screws - has conical end guide sleeve for impact socket spanner |
DE3123112A1 (en) * | 1981-06-11 | 1982-12-30 | Joachim 6581 Schauren Laudes | Device for screwing in and unscrewing a socket head cap screw |
US4503737A (en) * | 1983-04-11 | 1985-03-12 | Digiovanni Donald | Threaded fastener removing tool |
US4604917A (en) * | 1985-03-12 | 1986-08-12 | Eli Polonsky | Easy-out threaded fastener extractor |
-
1987
- 1987-12-31 DE DE87311548T patent/DE3787025T2/en not_active Expired - Fee Related
- 1987-12-31 EP EP87311548A patent/EP0322490B1/en not_active Expired - Lifetime
- 1987-12-31 AT AT87311548T patent/ATE92829T1/en not_active IP Right Cessation
- 1987-12-31 ES ES87311548T patent/ES2044961T3/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2121197A (en) * | 1936-07-01 | 1938-06-21 | Ridge Tool Company Of Elyria | Screw extractor |
GB1029357A (en) * | 1963-11-12 | 1966-05-11 | Robert Mankovitz | A key spanner and socket combination |
US3587363A (en) * | 1968-10-14 | 1971-06-28 | Monsanto Co | Ball plunger installing and removal tool |
DE2437142B1 (en) * | 1974-05-30 | 1975-09-04 | George Fresno Calif. Brase (V.St.A.) | Tool for loosening broken or worn connecting screws or the like |
CH593116A5 (en) * | 1975-07-08 | 1977-11-30 | Stoba Ag | Tool for releasing defective socket head screws - has conical end guide sleeve for impact socket spanner |
DE3123112A1 (en) * | 1981-06-11 | 1982-12-30 | Joachim 6581 Schauren Laudes | Device for screwing in and unscrewing a socket head cap screw |
US4503737A (en) * | 1983-04-11 | 1985-03-12 | Digiovanni Donald | Threaded fastener removing tool |
US4604917A (en) * | 1985-03-12 | 1986-08-12 | Eli Polonsky | Easy-out threaded fastener extractor |
Non-Patent Citations (1)
Title |
---|
METALWORKING PRODUCTION, vol. 110, no. 16, 20th April 1966, page 89, London, GB; O. HILLIG: "Key gets at hidden screws" * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4212180A1 (en) * | 1992-03-26 | 1993-09-30 | Audi Ag | Arrangement with screw for fastening of chassis section - has threaded bush with internal and external threads, with polygonal end for tool engagement |
DE4212180C2 (en) * | 1992-03-26 | 1998-05-07 | Audi Ag | Arrangement for fastening a chassis part |
FR2954917A1 (en) * | 2010-01-07 | 2011-07-08 | Peugeot Citroen Automobiles Sa | Screwing/unscrewing device for use in electric tool for screwing/unscrewing screw above hole in recess of equipment of seats of automobile, has base plate including central cavity for housing part of head arranged at fingerprint of screw |
Also Published As
Publication number | Publication date |
---|---|
ATE92829T1 (en) | 1993-08-15 |
ES2044961T3 (en) | 1994-01-16 |
DE3787025T2 (en) | 1994-02-17 |
DE3787025D1 (en) | 1993-09-16 |
EP0322490B1 (en) | 1993-08-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0930132B1 (en) | A tool for removing one-way fasteners | |
US5123310A (en) | Socket for turning fastener heads having deformed head surfaces | |
US7066062B2 (en) | Torque-setting, tamper-resistant fastener and method and tool for use with same | |
US5951554A (en) | Screw removal system | |
US5058465A (en) | Key holding tool for impressioning | |
EP3814060B1 (en) | Fastener extractor device | |
EP0110978B1 (en) | Tool to capture, control and manipulate threaded fasteners | |
US5664467A (en) | Adjustable socket | |
EP0842742A2 (en) | Fastener removing tool | |
EP0205147A3 (en) | Combination firefighter's tool | |
JP2664052B2 (en) | Tightening pin for tool holder | |
EP4094892A1 (en) | Advanced holding apparatus | |
EP0737122B1 (en) | Expandable jaw broken bolt extractor | |
US4350064A (en) | Auxiliary tool kit for a socket wrench set | |
US20160044876A1 (en) | Extractable fastener | |
US4296656A (en) | Driver bit attachment | |
US4716793A (en) | Polygonal tool for removal of stripped hex head fasteners | |
US4713990A (en) | Bolt extracting tool | |
US4572035A (en) | Tool constructions for removing frozen nuts | |
EP0322490A1 (en) | A tool for removing a threaded fastener | |
US4553455A (en) | Nut starter with special blades | |
US4939959A (en) | Fastener holding tool | |
US4434687A (en) | Damaged screw remover | |
US20010004858A1 (en) | Fastener extractor | |
US4106178A (en) | Threaded stud driving tool |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19900103 |
|
17Q | First examination report despatched |
Effective date: 19910212 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19930811 |
|
REF | Corresponds to: |
Ref document number: 92829 Country of ref document: AT Date of ref document: 19930815 Kind code of ref document: T |
|
ET | Fr: translation filed | ||
REF | Corresponds to: |
Ref document number: 3787025 Country of ref document: DE Date of ref document: 19930916 |
|
ITF | It: translation for a ep patent filed |
Owner name: STUDIO CONS. BREVETTUAL |
|
REG | Reference to a national code |
Ref country code: GR Ref legal event code: FG4A Free format text: 3008942 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19931208 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19931221 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19931230 Year of fee payment: 7 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19931231 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19931231 Year of fee payment: 7 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2044961 Country of ref document: ES Kind code of ref document: T3 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 19940127 Year of fee payment: 7 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19940701 |
|
26N | No opposition filed | ||
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19941220 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 19941223 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19941228 Year of fee payment: 8 |
|
REG | Reference to a national code |
Ref country code: GR Ref legal event code: MM2A Free format text: 3008942 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19941231 Ref country code: CH Effective date: 19941231 Ref country code: BE Effective date: 19941231 Ref country code: AT Effective date: 19941231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19950101 |
|
EAL | Se: european patent in force in sweden |
Ref document number: 87311548.9 |
|
BERE | Be: lapsed |
Owner name: SAFETY SOCKET SCREW CORP. Effective date: 19941231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19950831 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
EUG | Se: european patent has lapsed |
Ref document number: 87311548.9 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19951231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19960101 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19951231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19960903 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 19970113 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20051231 |