Phillips Screw Company

Michael L Mowins

Barry J Hughes

Recessed head fasteners are provided with a configuration by which the force applied by the blades of the driver to the recessed wings is applied at the radially outer regions of the wings. The wings of the fastener recess may be provided with torque pads at the outer regions of the wings adapted to engage the outer portions of the driver blades. The torque pads may be defined by relieved regions on the drive walls of the recess wings. The relieved regions are formed to avoid contact with the driver blades. Stabilizing ribs also may be defined at the radially inward regions of the drive walls. A recess engageable driver may include a plurality of radially extending ribs configured to promote engagement of the ribs with the most radially outward regions of the recess drive walls. The driver and the recess are compatible with each other as well as with otherwise corresponding conventional recesses and drivers that do not incorporate the invention. Also disclosed are punches and methods for making the disclosed fasteners.

Punch and manufacturing method for recessed head fastener

A drill bit has a chuck engaging shank portion having a geometric cross-sectional shape; a plurality of projections formed on at least a part of at least one of said surfaces; said projections (a) varying in height across said surface, and (b) engaging an inner surface of a chuck to prevent slippage of said bit in said chuck.

Tool bit

Recessed head fastener and driver systems

A driver bit and a driving tool having a plurality of projections formed on at least one surface of the shank portion/driving portion of the bit/tool to retain the bit in a bit holder, or to retain a socket or the like on the driving tool. The projections are formed such that the geometric envelope of the bit is within the tolerance of the bit holder, so that the bit can be used with standardized holders. When torque is applied to the bit or driving tool, the projections engage the inner surface of a standardized holder/socket, thereby retaining the bit/socket.

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Gloucester, MA, United States of America

Michael L Mowins