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US 9,302,377 B2Granted
Screw driving device
OwnerJacques Rajotteinventor
Life of this patent
Estimating the term…
Abstract
A screw driving device is provided which can counter-sink a screw at angles off of normal from a workpiece. The device includes a shank held in contact with a screw bit to drive the tip when a plurality of balls are held in contact between a screw bit head and a sleeve surrounding the shank and to disengage the shank from the bit when the screw is at a desired counter-sunk depth. The disengagement of the shank from the screw bit is provided by permitting the plurality of balls to slide out of contact between the rotating shank and bit to thus disengage the shank from the screw bit.
Claims11
A device for driving screws comprising:
- a shank having an end portion defined by a wall of annular cross-section defining a seat, said end portion terminating at an end surface, a plurality of radial bores formed in said wall;
- a screw bit having a head end received in said seat and a driver end adapted to drive a screw;
- a sleeve surrounding at least part of said end portion of said shank and axially movable, relative to said shank, said sleeve having a side surface facing said shank and having a recessed portion, said sleeve having an inward extending bottom surface with an aperture through which said screwdriver bit is disposed;
- a spring disposed between said end portion of said shank and said bottom surface to provide a biasing force between said shank and said sleeve, wherein said spring is disposed between said end surface of said shank and said bottom surface;
- and
- a plurality of balls disposed in respective bores in said end portion of said shank, said balls, in a driving configuration, being held in engagement with said screw bit head, said balls, in a non-driving configuration, being movable in a radial direction away from said screwdriver bit head into said recessed portion, thereby disengaging contact with said screw bit head.
3 more elements
A device for driving screws comprising:
- a shank having an end portion defined by a wall of annular cross-section defining a seat, said end portion terminating at an end surface, a plurality of radial bores formed in said wall;
- a screw bit having a head end received in said seat and a driver end adapted to drive a screw;
- a sleeve surrounding at least part of said end portion of said shank and axially movable, relative to said shank, said sleeve having a side surface facing said shank and having a recessed portion, said sleeve having an inward extending bottom surface with an aperture through which said screwdriver bit is disposed;
- a spring disposed between said end portion of said shank and said bottom surface to provide a biasing force between said shank and said sleeve, wherein the spring is disposed between said end surface of said shank and said bottom surface;
- and
- a plurality of balls disposed in respective bores in said end portion of said shank, said balls, in a driving configuration, being held in engagement with said screw bit head, said balls, in a non-driving configuration, being movable in a radial direction away from said screwdriver bit head into said recessed portion, thereby disengaging contact with said screw bit head.
3 more elements
A device for driving screws comprising:
- a shank having an end portion defined by a wall of annular cross-section defining a seat, said end portion terminating at an end surface, a plurality of radial bores formed in said wall;
- a screw bit having a head end received in said seat and a driver end adapted to drive a screw;
- a sleeve surrounding at least part of said end portion of said shank and axially movable, relative to said shank, said sleeve having a side surface facing said shank with a recessed portion, said sleeve having an inward extending bottom surface with an aperture through which said screwdriver bit is disposed;
- a spring disposed between said end portion of said shank and said bottom surface to provide a biasing force between said shank and said bottom surface, wherein the spring has an outside radius no greater than an outside radius of the shank;
- and
- a plurality of balls disposed in respective bores in said end portion of said shank, said balls, in a driving configuration, being held in engagement with said screw bit head, said balls, in a non-driving configuration, being movable in a radial direction away from said screwdriver bit head into said recessed portion, thereby disengaging contact with said screw bit head.
3 more elements
Dependencies are inferred from the claim text.