EP0487957B1 - Vorrichtung zur Halterung von Schrauben beim Eindrehen - Google Patents

Vorrichtung zur Halterung von Schrauben beim Eindrehen Download PDF

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Publication number
EP0487957B1
EP0487957B1 EP91119050A EP91119050A EP0487957B1 EP 0487957 B1 EP0487957 B1 EP 0487957B1 EP 91119050 A EP91119050 A EP 91119050A EP 91119050 A EP91119050 A EP 91119050A EP 0487957 B1 EP0487957 B1 EP 0487957B1
Authority
EP
European Patent Office
Prior art keywords
screw
screwing
axis
support jaws
rest position
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.)
Expired - Lifetime
Application number
EP91119050A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0487957A1 (de
Inventor
Erich Palm
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.)
SFS Industrie Holding AG
Original Assignee
SFS Industrie Holding AG
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 SFS Industrie Holding AG filed Critical SFS Industrie Holding AG
Publication of EP0487957A1 publication Critical patent/EP0487957A1/de
Application granted granted Critical
Publication of EP0487957B1 publication Critical patent/EP0487957B1/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
    • B25B23/02—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

Definitions

  • the invention relates to a device for holding screws, in particular self-tapping and self-tapping screws, when screwing in, consisting of a component which can be fixed on the housing of a drive unit, a screw nut which can be coupled to the drive and which is designed to receive at least a portion of the drive end, and at least Two support jaws pivotable about pivot bearings oriented transversely to the screw-in axis, in their rest position leaving a passage opening for the shaft of a screw, the support jaws in their rest position being approximately transverse to the screw-in axis and projecting freely from their pivot bearing in the direction of the screw-in axis.
  • a device for holding screws when screwing in which is known from DD 228 769 A1
  • the ends of these support jaws which grip the screw shank are offset by a substantial amount in the direction of the screw-in axis with respect to their rotary bearing. If a lateral load is exerted on the screw tip, the support jaws are pivoted outwards and the screw is no longer held and securely supported.
  • a secure mounting and support of long screws is not possible with this known device.
  • the screws can only be inserted from the back of the three-jaw chuck in the screw-in direction. This is also the reason why in this known device the use of screws is only possible up to a certain length and usually only of short screws.
  • a device known from DE 25 49 601 A1 for holding screws when screwing in has a similar structure.
  • a lock is provided which only allows the support jaws to be pivoted out when the fastening process of the fastener is already in a corresponding stage.
  • Relatively complicated locking elements which are displaceable in the screwing-in direction and which can be withdrawn again are therefore required, which only release the support jaws for a pivoting operation at a specific time.
  • the screws can only be inserted from the back of the support jaws in the screw-in direction.
  • the device is provided with a filling tube protruding at an acute angle. In this device too, therefore, only screws up to a certain length and generally only short screws can be used.
  • These support jaws are held in their position by a spring-loaded sleeve and swivel downwards when the head of the screw to be screwed hits.
  • the object of the invention is to design a device of the type mentioned in the introduction in such a way that simple and secure support and mounting of long screws is also possible.
  • the support jaws of the above-mentioned device rest against a stop in a spring-loaded manner in the rest position in the direction opposite to the screw-in direction are designed to be pivotable from the rest position in the screw-in direction and include an acute angle with the screw-in axis in their rest position facing the screw-in axis , are slightly inclined towards the screw nut.
  • Such an arrangement of the support jaws enables a screw, in particular a relatively long screw, to be held securely, since the screw can be inserted into the screw nut with its drive end on the one hand and can be held in the region of the shaft at a corresponding distance from the screw nut from the support jaws becomes.
  • An approximately rigid alignment of the shaft of the screw is therefore possible exactly in the screw-in axis.
  • This inventive design of the device has created the possibility of preventing the support jaws from swiveling out to the side even without additional locking elements which can be actuated as a function of the axial displacement of any parts in the screwing direction. It has namely been recognized that when the support jaws in their rest position are oriented approximately transversely to the screw-in axis and project freely from their pivot bearing in the direction of the screw-in axis, lateral loads on the screw used have no effect on the support jaws, as a result of the practically perpendicular to the Forces acting on the pivot bearing no torque is exerted on the support jaws. The support jaws remain in position and provide proper support and support even long screws without the need for additional locking elements.
  • the support jaws bear against a stop in a spring-loaded manner in the direction opposite to the screw-in direction and are designed to be pivotable in the screw-in direction, they are pivoted back again and again spring-loaded into the same position after being pivoted out, this position being defined by corresponding stops.
  • a very safe lock against unwanted pivoting of the support jaws is achieved in that the support jaws form an acute angle with the screw-in axis in their rest position directed towards the screw-in axis, that is to say are slightly inclined towards the screw-nut. This also means that the conical indentation by lever action cannot unintentionally cause the support jaws to pivot.
  • the support jaws only pivot downwards when a load is exerted on them in the screwing direction.
  • the support jaws So that the rest of the support jaws firmly resting against each other at their two ends can always pivot well against one another, the support jaws have inclined end faces, so that the end faces include an open angle towards the screw nut and / or away from it, with the screw-in axis.
  • a yoke-like supporting part is provided for the storage and mounting of the support jaws, the legs of which protrude freely parallel to one another at a distance have the pivot bearings and stops for the support jaws.
  • the support jaws are thus in two mutually opposite sides from freely accessible areas, so that just long screws can be used by hand in a very simple manner.
  • the free ends of the legs of the yoke-like supporting part be designed as supports and for support on the workpiece to be screwed.
  • the device 1 for holding screws 2 when screwing in essentially consists of a component 5 which can be fixed on the housing 3 of a drive unit 4, a screw nut 6 which is designed to receive at least a portion of the drive end 7 of a screw 2, and a support part 8, in which at least two support jaws 9, 10 are held.
  • the nut 6 can be coupled to a drive 11.
  • two spaced-apart guide disks 12 and 13 are provided to guide the screw nut 6 within the component 5.
  • the right support jaw 10 is shown in its rest position, which also represents the operating position.
  • the left support jaw 9 is shown in the pivoted-back position. In use, of course, both support jaws 9 and 10 are in the same position.
  • the support jaws 9, 10 are aligned approximately transversely to the screw-in axis 14 and project freely from their pivot bearing 15, 16 in the direction of the screw-in axis 14. In the direction opposite to the screwing-in direction E, the support jaws 9, 10 are spring-loaded against a stop 17, 18. In the screwing direction E, however, the support jaws 9, 10 are designed to be pivotable.
  • the support jaws 9, 10 are made plate-shaped and have central, approximately semicircular indentations 19 at their free ends.
  • the two indentations 19 form an approximately circular passage opening in which the shaft 20 of the screw 2 to be inserted is held. So that, if necessary, the support jaws 9, 10 can be pivoted without problems even when the screw 2 is inserted or when the same is inserted, the indentations 19 are designed to be approximately semi-conical in the direction of the screw nut 6.
  • the support jaws 9, 10 form an acute angle ⁇ with the screw-in axis 14 in their rest position directed towards the screw-in axis 14.
  • the support jaws 9, 10 are thus slightly inclined towards the screw nut 6. It is thus ensured that when the support jaws 9, 10 are loaded in the direction transverse to the screw-in axis 14, they cannot pivot downward, but, in contrast, are pressed even more firmly against the corresponding stop 17 or 18.
  • the support jaws 9, 10 have inclined end surfaces 21, these inclined end surfaces being able to originate only from one surface 22 or 23 or, as shown, from both surfaces 22, 23. These inclined end surfaces 21 form an acute angle with the screw-in axis 14, which is towards or away from the screw nut 6 or open on both sides.
  • One or two side surfaces 24, 25 merge into the oblique end surfaces 21 with an acute-angled bevel 26, 27, 28 or a corresponding rounding. This enables the shaft 20 to be pressed in from the side. With a corresponding pressure on the shaft 20, the support jaws 9, 10 move downward in the screwing-in direction through these acute-angled bevels and thus allow the shaft 20 of the screw 2 to penetrate into the through opening formed by the indentations 19.
  • the support jaws 9, 10 At the end facing away from the indentation 19, the support jaws 9, 10 have bearing eyes 29, 30 so that they can be supported in the supporting part 8 by means of corresponding bolts 31.
  • the supporting part 8 For supporting and holding the support jaws 9, 10, the supporting part 8 is designed in a yoke-like manner, its legs 32, 33, which project freely parallel to one another at a distance, have the pivot bearings 15, 16 and the stops 17, 18 for the support jaws 9, 10.
  • the support jaws 9, 10 are held so as to be pivotable through an angle of approximately 90 ° and are entirely opposed to the force of a spring 34 Legs 32, 33 can be swiveled in.
  • the support jaw 9 shown has not yet been completely pivoted into the leg 33, and could therefore be moved further. This pivoting movement can take place until the support jaw 9 comes into contact with a section 35 that is indented for this purpose at the stop 17.
  • the free ends of the legs 32, 33 are also suitable for serving as supports and for support on the workpiece to be screwed.
  • the supporting part 8 is telescopic on the structure 5 which can be fixed on the drive unit 4, i.e. on a tubular body 39 of the same, guided.
  • the supporting part 8 is held in a lower rest position by means of a helical spring 40.
  • the component 5 is pushed into the supporting part 8, namely until a stop ring 37 abuts a stop element 38.
  • the special arrangement and design of the support jaws 9 and 10 is particularly important for the device 1 described here, although further design variants are possible. Modifications would be conceivable here, both in terms of design and form. However, it is always special Meaning that the support jaws 9, 10 project approximately freely from their pivot bearing 15, 16 in the direction of the screw-in axis 14, oriented approximately transversely to the screw-in axis 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Jigs For Machine Tools (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Clamps And Clips (AREA)
  • Braking Systems And Boosters (AREA)
EP91119050A 1990-11-26 1991-11-08 Vorrichtung zur Halterung von Schrauben beim Eindrehen Expired - Lifetime EP0487957B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4037547 1990-11-26
DE4037547A DE4037547C1 (da) 1990-11-26 1990-11-26

Publications (2)

Publication Number Publication Date
EP0487957A1 EP0487957A1 (de) 1992-06-03
EP0487957B1 true EP0487957B1 (de) 1995-10-18

Family

ID=6418925

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119050A Expired - Lifetime EP0487957B1 (de) 1990-11-26 1991-11-08 Vorrichtung zur Halterung von Schrauben beim Eindrehen

Country Status (3)

Country Link
EP (1) EP0487957B1 (da)
AT (1) ATE129177T1 (da)
DE (2) DE4037547C1 (da)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4422725A1 (de) * 1994-06-29 1996-01-04 Reich Maschf Gmbh Karl Eintreibgerät für Befestigungsmittel
DE19954699A1 (de) * 1999-11-13 2001-05-31 Eckold Vorrichtung Vorrichtung zum mechanischen Fügen von flächig aufeinanderliegenden Blechen unter Einsatz von Hilsfügeteilen
DE10242511A1 (de) * 2002-09-12 2004-04-08 Gedore-Werkzeugfabrik Otto Dowidat Kg Schraubwerkzeug insbesondere Schlag-Ringschlüssel
DE10348427A1 (de) * 2003-10-14 2005-05-19 Volkswagen Ag Verfahren und Vorrichtung zur Direktverschraubung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1573990A (da) * 1968-03-18 1969-07-11
US4003417A (en) * 1975-07-28 1977-01-18 Leroy Cornwell Self locking and unlocking clamp for automatic fastener driving tools
DE2549601A1 (de) * 1975-11-05 1977-05-12 Erich Klesatschke Schrauber zum einschrauben von schrauben o.dgl.
SE8008127L (sv) * 1980-11-20 1982-05-21 Automatik & Maskin Ab Apparat avsedd att anvendas vid motordrivna skruvindrivningsapparater for styrning av skruvmejsel och skruv
DD228769A1 (de) * 1984-11-16 1985-10-23 Karosseriewerk Halle Werk 2 Ve Vorsatzwerkzeug zur ausfuehrung unterschiedlicher schraubverbindungen
GB2206828B (en) * 1987-07-14 1990-10-31 Neville John Smith Screwdriving tool

Also Published As

Publication number Publication date
DE59106726D1 (de) 1995-11-23
DE4037547C1 (da) 1992-01-23
ATE129177T1 (de) 1995-11-15
EP0487957A1 (de) 1992-06-03

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