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US 2012/0054985 A1Published application
Handle attachment for doorknobs
OwnerJohn Jacob Rothschildinventor
Life of this patent
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Abstract
A device for providing a lever attachment to round doorknobs having a flexible cylindrical part that adapts to the majority of doorknobs of different diameters, thicknesses and profiles. During the screw tightening the compressible elastomeric material sandwiched between doorknob and cylindrical part of the attachment increases the interface contact surface to take the shape of the doorknob profile. The elastomeric insert has a high coefficient of friction. It prevents slipping of the attachment after tightening.
Claims8
An attachment providing a handle to doorknobs of various shapes and diameters.
Dependencies are inferred from the claim text.