EP0672505A1 - Outil de vissage - Google Patents

Outil de vissage Download PDF

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Publication number
EP0672505A1
EP0672505A1 EP95102862A EP95102862A EP0672505A1 EP 0672505 A1 EP0672505 A1 EP 0672505A1 EP 95102862 A EP95102862 A EP 95102862A EP 95102862 A EP95102862 A EP 95102862A EP 0672505 A1 EP0672505 A1 EP 0672505A1
Authority
EP
European Patent Office
Prior art keywords
shaft
hub
screwdriver
projections
flywheel
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Withdrawn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
EP95102862A
Other languages
German (de)
English (en)
Inventor
Hermann Hatzfeld
Helmut Hagemann
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
Priority claimed from DE19944409494 external-priority patent/DE4409494A1/de
Priority claimed from DE9417052U external-priority patent/DE9417052U1/de
Application filed by Individual filed Critical Individual
Publication of EP0672505A1 publication Critical patent/EP0672505A1/fr
Withdrawn legal-status Critical Current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
    • B25B19/00—Impact wrenches or screwdrivers

Definitions

  • the invention relates to a screwdriver for tightening and loosening screws, which has a shaft with a screwdriver head to be coupled with a screw and in which a flywheel with a hub is rotatably mounted on the shaft over less than a full circle, which limits the rotary movement of the Flywheel body has an inward cam which is movable against an outward projection of the shaft.
  • a screwdriver of the above type is the subject of FR-A-22 42 200.
  • a hub is rotatably mounted on the shaft to a limited extent, which has a tangentially outwardly directed rod with a centrifugal weight as a flywheel on its outer surface.
  • the hub has an inward cam that comes against a corresponding outward cam of the shaft when the centrifugal weight hub is rotated relative to the shaft.
  • centrifugal weight in screwdrivers of this type is to exert a suddenly effective impact force on the screw to be rotated when the hub rotates with the centrifugal weight so that it can be loosened without the user of the screwdriver having to generate a high torque with his physical strength .
  • a disadvantage of the known screwdriver is that it is difficult to handle since the unilaterally effective centrifugal weight tends to move the screwdriver out of its position aligned with the screw. Especially at the moment when the hub through the Momentum of the centrifugal weight against the shaft, there is a sudden tilting moment, which can lead to the screwdriver slipping off the screw to be loosened.
  • the invention is based on the problem of improving a screwdriver of the type mentioned at the outset so that it can be handled as conveniently as possible and without the risk of slipping off the screw or nut to be loosened.
  • the flywheel has flywheels evenly distributed on two opposite sides of the hub, that the hub has two radial, inwardly directed cams diametrically opposite and that the shaft diametrically opposite two radially outwards in the flight circle of the two other cam has protruding projections.
  • the flywheel could be a flywheel.
  • the screwdriver is particularly compact and can therefore be easily accommodated in a motor vehicle if, according to a further development of the invention, the flywheel on its hub has two radially outwardly directed rods, each with a centrifugal weight, facing one another.
  • the cams of the hub for guiding the hub on the outer surface of the shaft and / or the projections of the shaft for guiding the inner outer surface of the hub are formed on the shaft.
  • the shaft is rotatably connected to a cam disk, which has two radial cams diametrically opposite and that the flywheel with two side disks engages over this cam disk and also diametrically opposite two radially inward into the flight circle of the protruding projections on both cams.
  • High torques can be achieved without the screwdriver becoming undesirably heavy due to the weight of the flywheel if the two radially outwardly extending rods are fastened to the two side windows, each with one of the flyweights.
  • the main mass of the flywheel is shifted to the outside by the rods, so that large moments of swing arise.
  • the cam disk is provided on an insert body which has a continuous square hole with a square cross section for pushing through a corresponding square shaft and a short cylindrical shaft on both sides of the cam disk for rotatably supporting the flywheel body.
  • the screwdriver can be held particularly conveniently with one hand in a position plugged onto a screw and the flywheel can then be pushed when a rotatable handle is arranged on the shaft at the end of the shaft opposite the screw head.
  • FIG. 1 shows a flywheel 1, which has a hub 2, from which two rods 3, 4 lead radially outward on opposite sides, each of which carries a centrifugal weight 5, 6 of the same weight at its outer end.
  • the hub 2 has a bore 7 into which two radial cams 8, 9 protrude.
  • Figures 2 and 3 show a shaft 10 which is formed at its lower end as a square 11, so that it can be attached to a screwdriver head, not shown.
  • the shaft 10 has a handle 12.
  • the shaft 10 is circular in cross section, but there has two projections 13, 14 running opposite it over a longer region.
  • the shaft 10 with the handle 12 has been omitted.
  • This shaft 10 which must have a square cross section for this embodiment, is to be inserted through a square hole 15 of an insert body 16 when the screwdriver is used.
  • the insert body 16 is held between two side disks 17, 18 of the flywheel 1 in such a way that a cam disk 19 is located between these side disks 17, 18 and the side disks 17, 18 are rotatably supported on a shaft 20, 21. From the side windows 17, 18 each rod 3, 4 leads radially outwards, which carries the flyweight 5, 6 at its free end.
  • FIG. 6 shows as a single part the insert body 16 with the cam disk 19, which has the two diametrically opposite radial projections 22, 23.
  • the short, cylindrical shaft 20, 21 is provided on each side of the cam disk 19.
  • the square hole 15 with a square cross section leads axially through the insert body 16.
  • This square hole 15 can be seen from the side in FIG.
  • the two projections 22, 23 in the cam disk 19 and the shaft 10 can also be seen in FIG. 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
EP95102862A 1994-03-19 1995-03-01 Outil de vissage Withdrawn EP0672505A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4409494 1994-03-19
DE19944409494 DE4409494A1 (de) 1994-03-19 1994-03-19 Schrauber
DE9417052U 1994-10-22
DE9417052U DE9417052U1 (de) 1994-10-22 1994-10-22 Schrauber

Publications (1)

Publication Number Publication Date
EP0672505A1 true EP0672505A1 (fr) 1995-09-20

Family

ID=25934884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95102862A Withdrawn EP0672505A1 (fr) 1994-03-19 1995-03-01 Outil de vissage

Country Status (1)

Country Link
EP (1) EP0672505A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9878839B2 (en) 2012-05-15 2018-01-30 Mantrose-Haeuser Co., Inc. Seaweed-based food packaging coating

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313398A (en) * 1939-06-29 1943-03-09 Jacob A Ronning Wrench-acting tool
GB837892A (en) * 1955-07-25 1960-06-15 British Thomson Houston Co Ltd Improvements in devices for tightening and loosening screws, nuts and bolts
DE2538473A1 (de) * 1975-08-29 1977-03-03 Johann Hochreuter Schlagschluessel
US4628776A (en) * 1985-10-07 1986-12-16 Witbeck Melverton R Rotary impact lug tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313398A (en) * 1939-06-29 1943-03-09 Jacob A Ronning Wrench-acting tool
GB837892A (en) * 1955-07-25 1960-06-15 British Thomson Houston Co Ltd Improvements in devices for tightening and loosening screws, nuts and bolts
DE2538473A1 (de) * 1975-08-29 1977-03-03 Johann Hochreuter Schlagschluessel
US4628776A (en) * 1985-10-07 1986-12-16 Witbeck Melverton R Rotary impact lug tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9878839B2 (en) 2012-05-15 2018-01-30 Mantrose-Haeuser Co., Inc. Seaweed-based food packaging coating

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Effective date: 19960321