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Method of automatically preventing slippage of driver on a screw or bolt Disclosure Number: IPCOM000246495D
Publication Date: 2016-Jun-13
Document File: 1 page(s) / 33K

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The Prior Art Database


Here we outline a method by which a user can undo screws of varying tension without damaging the tool and without slipping the tool from the screw.

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Method of automatically preventing slippage of driver on a screw or bolt

Often when attempting to undo a really tight screw the screwdriver will slip in the screw. This causes the screw and the screwdriver to be damaged.

    A screwdriver which prevents the turning force to be applied unless enough pressure is being asserted towards the screw.

    A screwdriver with: 1. One or more cameras 2. Pressure sensor 3. Rotation sensor or motor 4. Accelerometer or tilt sensor

1. Take a number of pictures of the screw head in question.

2. Make the pictures up into a 3D model of the screw head.

    3. Do likewise (or load a predefined model) for the screwdriver head or bit 4. Intersect the two models to calculate the friction at a number of possible angles (see Related Work for a possible method)

    5. Estimate the pressure required at the perfect angle as well as 5 degrees off in each direction

    6. Using the information above decide whether to allow the rotation requested (by turning the screwdriver or pulling the trigger for the motor) to be applied based on the current pressure being applied towards the screw head and the angle of the driver to the screw. The rotation could also be limited rather than disallowed.

    Option for calculation of friction: