4. Tools
  5. Wrench, screwdriver, or driver therefor
  6. Responsive to torque on work

Ewald Hald

Inventor

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Clutch for power screwdrivers

Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Patent

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Electric tool with source of power independent of the line

Tool driving or impacting – Drive control operable by hand engaging manipulating handle
Patent

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Machine with variable torque setting

192 clutches and power-stop control – Stop mechanism – Overload release
Patent

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Power-driven screwdriver with torque-dependent release clutch

Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1221158

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