(19)
(11) EP 0 328 799 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.01.1990 Bulletin 1990/02

(43) Date of publication A2:
23.08.1989 Bulletin 1989/34

(21) Application number: 88300825.2

(22) Date of filing: 01.02.1988
(51) International Patent Classification (IPC)4: B25B 15/06
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(71) Applicant: WORKTOOLS, INC.,
Los Angeles California 90024 (US)

(72) Inventor:
  • Marks, Joel S.
    Los Angeles California 90024 (US)

(74) Representative: Jackson, Peter Arthur et al
GILL JENNINGS & EVERY Broadgate House 7 Eldon Street
London EC2M 7LH
London EC2M 7LH (GB)


(56) References cited: : 
   
       


    (54) Variable torque driver tool


    (57) A hand-squeeze driver tool which serves to convert squeezing motion into rotary motion on a variable torque basis, with the torque being inversely related to the driving speed. The torque versus driving speed relationship is determined by the position of a squeeze lever (41) as it is displaced from its most extended position. Two distinct zones are provided as the squeeze lever is so displaced, namely a high torque low speed zone, and a low torque high speed zone. The provision of the high torque low speed initial zone, followed by the low torque high speed zone permits the operator intuitively to take advantage of the variable torque feature of the invention, which is provided by a traveling fulcrum which dwells at position F1 and F2 defined by sharp angles in levers (41,53).







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