A drive system including a bit with a bit end configured to provide targeted frictional engagement with a fastener. The bit end has an outer leading wall tapered with respect to the bit end longitudinal axis at a leading wall angle selected from leading wall angle values ranging within a leading wall angle tolerance band and the fastener has an inner recess wall tapered with respect to the fastener longitudinal axis at a recess wall angle selected from recess wall angle values ranging within a recess wall angle tolerance band, wherein the leading wall angle values within the leading wall angle tolerance band and the recess wall angles values within the recess wall angle tolerance band do not overlap when the outer leading wall contacts the inner pilot recess wall at a targeted focal area to achieve a desired level of frictional engagement between the pilot end and the fastener.

A driver tool for insertion and removal of a first part configured for threaded engagement in a corresponding threaded bore in a second part has a driving end portion of polygonal shape with multiple flats configured for engagement in a recess in the first part having a corresponding polygonal shape. Some or all of the flats have a respective grabbing feature or edge designed to grab or grip into the opposing surface of the recess to allow a greater amount of torque to be applied to the first part when the tool is rotated in the unthreading direction than when it is rotated in the opposite threading or insertion direction.

A retainer removal tool for a carpet retainer of a vehicle includes a shaft portion and a handle portion. The shaft portion has a cylindrical shape and includes an engagement tip has a hollow cylindrical shape and is configured to depress a tab of the retainer in a radially inward direction to decouple an upper retainer from a lower retainer. Further, a method for removing a carpet retainer of a vehicle includes centering a retainer removal tool over the retainer, depressing the retainer removal tool onto the retainer, disengaging a tab of the retainer with the retainer removal tool, and removing the retainer from the carpet.

The invention provides a screw in which the screw head (1) has a slot (2) in the upper surface of the screw head, an upper peripheral wall (9) of regular planform extending down from the rim of the slot into the screwhead, the upper peripheral wall (9) being generally aligned with the axis of the screw to form a recess (3), a sloping transition surface (15), extending downwardly and inwardly with respect to the lower edge of the upper peripheral wall (9), and a further recess (11) extending downwardly from the lower edge of the sloping transition surface (15), in which the dimensions of the screw head are such that when the screwhead is engaged by a tool (6) having upper (16) and lower (17) engagement sections, and in which the upper engagement section (16) extends downwardly with respect to the axis of the screw to which the tool is to engage and the lower engagement section (17) extends further downwardly, and in which there is at least one protrusion (or rib) (21) on the inside wall (12) of the further recess (11), so that there is a stick fit between the protrusion (21) on the inside wall (12) of the further recess (11) and the lower engagement section (17) of the tool (6).

A drive system with full surface drive contact. The drive system tends to maximize the surface contact pattern or area at typical bit-recess reaction (drive) torque values, thereby tending to minimize bit-recess surface contact stresses, coating damage, recess ream and premature bit fatigue failure.

Methods and apparatus for a fastener head having a dual zone socket area and a mating driver bit according to aspects of the present technology include a fastener configured with driving surfaces adapted to provide enhanced engagement between each other during use. The fastener includes a recessed socket area with a sidewall that has an upper inwardly tapering section and a lower vertical section that extends to the bottom of the recessed socket area. The upper inwardly tapering section of the sidewall may also include an offset relative to the lower vertical section to create asymmetrical driving and removal surfaces. The technology also includes a corresponding mating driver bit configured with mating surfaces to the fastener to provide enhanced engagement between the fastener and mating driver bit. The technology also allows either the fastener or the driving bit to be used with preexisting fasteners and driver bits.

An optical axis adjustment device that adjusts an optical axis of a headlamp includes an aiming screw that is provided extending from inside to outside the headlamp and that has an operation portion outside the headlamp, and an aiming guide. The aiming guide is disposed outside the headlamp and includes: a cover portion that covers the operation portion of the aiming screw; a guide portion that has a tool insertion space inside and that is provided extending linearly from the cover portion; and a locking cap portion that is provided on an end portion of the guide portion away from the cover portion and that is configured to cover an opening of the tool insertion space.

A screw head adapter, including a surrounding shaped envelope, being hex, square, etc., being adaptable to a standard key, ring, box wrench, including at its center, a bit, a flat-blade screwdriver, a Phillips screwdriver, hex, Allen wrench, having an adjustable or constant height, for connecting thereof to a standard key, box wrench, dedicated key, etc., adapted thereto and supported by a dedicated protrusion, being fastened to the box wrench by a mechanical, magnetic, etc. attaching means, for allowing, due to its short height, to easily open or close screw heads in narrow hidden regions, and to those having difficult or non-available access by other tools.

A socket structure contains: a hollow body, a fitting member, an operation bar, a first spring, and a second spring. The hollow body includes a first accommodation groove, a connection groove, a first guide groove, and a second guide groove. The fitting member includes a first section, a second section, a second accommodation groove, a polygonal hole, and a peripheral trough. The hollow body further includes at least one fixing element, the first spring abuts against a stepped connection portion of the first guide groove and the second guide groove and the second section of the fitting member. The operation bar includes a polygonal extension and a peripheral rib. The second spring abuts against a bottom of the second guide groove, and a second end of the second spring pushes the polygonal extension of the operation bar to extend out of the second accommodation groove.

Various embodiments of a curved-tip screwdriver bit are presented. The bit may include a shank, a body connected with the shank, and a tip disposed at an end of the body. The tip may include curved blades that project from the end of the shaft. A first curved blade may have a first arc shaped cross section. A second curved blade may have a second arc shaped cross section. A radius of the second arc-shaped cross section may be greater than a radius of the first arc-shaped cross section of the first curved blade.