EP0501883A1 - Schraubendreher mit flachem Blatt und zurückziehbarer Führung - Google Patents

Schraubendreher mit flachem Blatt und zurückziehbarer Führung Download PDF

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Publication number
EP0501883A1
EP0501883A1 EP92400497A EP92400497A EP0501883A1 EP 0501883 A1 EP0501883 A1 EP 0501883A1 EP 92400497 A EP92400497 A EP 92400497A EP 92400497 A EP92400497 A EP 92400497A EP 0501883 A1 EP0501883 A1 EP 0501883A1
Authority
EP
European Patent Office
Prior art keywords
blade
ring
screwdriver
guide
handle
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
Application number
EP92400497A
Other languages
English (en)
French (fr)
Other versions
EP0501883B1 (de
Inventor
Henri Bobillo
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0501883A1 publication Critical patent/EP0501883A1/de
Application granted granted Critical
Publication of EP0501883B1 publication Critical patent/EP0501883B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/10—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means
    • B25B23/101—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using mechanical gripping means for hand-driven screw-drivers

Definitions

  • the present invention relates to a flat head screwdriver.
  • a screwdriver for screwing or unscrewing
  • the risk of slipping of the flat head previously engaged in the screw is present. This will then require the reintroduction of the flat head into the slot, provided for this purpose on the top of the screw. Any slipping of the flat head could also cause injury to the user.
  • the object of the present invention is to prevent any possible sliding of the flat head and therefore any possibility of injury.
  • the screwdriver according to the invention having a handle 1, a blade 2 around which is mounted a tubular guide 6 having an internal shoulder 9 brought into pressure against a stop 5 of the blade by the effect of the thrust exerted by an elastic member 4 mounted in compression around the blade between said guide and a ring 3 mounted on the blade 2 is essentially characterized in that said ring 3 is slidably mounted with friction on the blade 2 and that the intensity of the friction forces between the ring 3 and the blade 2 is greater than the intensity of the thrust force exerted by the elastic member 4 on said ring 3.
  • the withdrawal of the retractable guide mechanism will convert the screwdriver according to the invention into the usual screwdriver.
  • the removable handle 1 of the screwdriver will be molded plastic which will facilitate its manufacture.
  • the screwing head may adopt a cruciform shape or any other shape.
  • the retractable guide mechanism consists of a guide tubular 6 slidably mounted on the blade, by a ring 3 mounted on the blade with spacing from the tubular guide and by an elastic member 4 such as a spring with non-contiguous turns mounted in low compression around the blade, between the tubular guide and the ring 3. This elastic member is supported both on the ring 3 and on the tubular guide 6. The ring 3 maintains the spring in position.
  • the tubular guide 6 is for example of cylindrical shape.
  • This tubular guide comprises a cylindrical envelope comprising in the upper part a transverse wall pierced right through according to its thickness of an orifice in which the blade 2 freely engages, the diameter of the blade being less than the diameter of the orifice.
  • This arrangement will give the retractable guide a certain freedom of movement between the stop 5 and the ring 3.
  • the diameter of the casing is greater than that of the stop 5 and the width of the screw head.
  • the diameter of the orifice made in the transverse wall of the envelope is less than that of the stop 5.
  • transverse wall forms in the envelope a shoulder 9 by which the tubular guide, under the effect of the thrust exerted by the spring 4, will come to bear against the stop 5.
  • the internal height of the casing is greater than the height of the screwing head measured between its lower end and the bearing face, of the guide, of the stopper 5.
  • the internal diameter of the casing is slightly greater than that of the head of the screw.
  • the guide when it is in abutment against the stop 5 comes around the screwing head and around the screw which axially maintains the screwdriver relative to the screw and prevents any lateral sliding of the screwing head 7 relative to the head of the screw.
  • the tubular guide may be made of light alloy but preferably it will be made of a material transparent to light which allows the vision of the screwing head for its engagement in the slot of the screw.
  • the ring 3 may be made of steel and be fixed by welding to the blade 2, but according to a preferred embodiment, the ring 3 is made of synthetic material and is pierced axially right through by an orifice through which it engages by sliding with friction on the blade 2.
  • the intensity of the friction forces between the ring 3 and the blade 2 are greater than the intensity of the thrust force exerted by the elastic member 4 on the said ring, whatever the degree of compression of this organ.
  • the intensity of the thrust forces exerted by the elastic member is sufficient to keep the tubular guide in abutment against the stop 5 but insufficient to move the ring 3 along the blade 2.
  • the ring 3 can be moved along the rod by the user to adjust the degree of compression of the elastic member 4.
  • the elastic member 4 is fixed by its two ends to the tubular guide 6 and to the ring 3.
  • the elastic member 4 By its corresponding end may be engaged in a radial drilling made in the said ring.
  • the elastic member can be engaged around a conical shape practiced axially at the end of said guide. This conical shape will flare ves the handle 1.
  • the manipulation of the screwdriver with retractable anti-detachment guide does not differ from that of a usual screwdriver but facilitates the screwing or unscrewing of the difficult to access screws and especially prevents the screwing head 7 from slipping off the screw.
  • the screwdriver can be made without handle, in this case, the blade can be taken in the chuck of a rotary or fixed drill.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Basic Packing Technique (AREA)
EP92400497A 1991-03-01 1992-02-26 Schraubendreher mit flachem Blatt und zurückziehbarer Führung Expired - Lifetime EP0501883B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9102773A FR2673392B1 (fr) 1991-03-01 1991-03-01 Tournevis a tete plate et a guide retractable.
FR9102773 1991-03-01

Publications (2)

Publication Number Publication Date
EP0501883A1 true EP0501883A1 (de) 1992-09-02
EP0501883B1 EP0501883B1 (de) 1996-07-10

Family

ID=9410477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92400497A Expired - Lifetime EP0501883B1 (de) 1991-03-01 1992-02-26 Schraubendreher mit flachem Blatt und zurückziehbarer Führung

Country Status (4)

Country Link
EP (1) EP0501883B1 (de)
AT (1) ATE140177T1 (de)
DE (1) DE69212018D1 (de)
FR (1) FR2673392B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5458030A (en) * 1992-11-04 1995-10-17 Betts; Geoffrey Screwdrivers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH243414A (de) * 1945-02-15 1946-07-15 Zimmerli Adolf Vorrichtung an Schraubenziehern.
DE1071007B (de) * 1959-12-10 Kassel Curt Starck Schraubenzieher mit federnder Greif-, Halte- und Führungshülse
US3288185A (en) * 1965-01-15 1966-11-29 Wade Stevenson Screwdriver construction
US3604488A (en) * 1969-11-19 1971-09-14 Vermont American Corp Screwdriver attachment
DE2020904A1 (de) * 1970-04-29 1971-11-18 Armin Ruettinger Fuehrungsvorrichtung fuer Schraubenzieher
DE3622199A1 (de) * 1986-07-02 1988-01-07 Georg Unger Spezialschraubenzieher

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB733857A (en) * 1951-11-17 1955-07-20 Cheney & Son Ltd C Improvements in screwdrivers
GB2073638A (en) * 1980-03-11 1981-10-21 Hughes G Screwdrivers
US4800788A (en) * 1987-04-04 1989-01-31 Innovative Computer Tools, Inc. Non-slip screwdriver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1071007B (de) * 1959-12-10 Kassel Curt Starck Schraubenzieher mit federnder Greif-, Halte- und Führungshülse
CH243414A (de) * 1945-02-15 1946-07-15 Zimmerli Adolf Vorrichtung an Schraubenziehern.
US3288185A (en) * 1965-01-15 1966-11-29 Wade Stevenson Screwdriver construction
US3604488A (en) * 1969-11-19 1971-09-14 Vermont American Corp Screwdriver attachment
DE2020904A1 (de) * 1970-04-29 1971-11-18 Armin Ruettinger Fuehrungsvorrichtung fuer Schraubenzieher
DE3622199A1 (de) * 1986-07-02 1988-01-07 Georg Unger Spezialschraubenzieher

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5458030A (en) * 1992-11-04 1995-10-17 Betts; Geoffrey Screwdrivers

Also Published As

Publication number Publication date
FR2673392A1 (fr) 1992-09-04
EP0501883B1 (de) 1996-07-10
DE69212018D1 (de) 1996-08-14
ATE140177T1 (de) 1996-07-15
FR2673392B1 (fr) 1995-06-02

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