Abstract:
A fastener (200) having a head (202) comprising a recess (206) for receiving the driving portion (12) of a driver (10), the driving portion and the recess being shaped such that rotation of the driving portion within the recess engages the driving portion with the head, such that further rotation of the driver causes the fastener to rotate, wherein the recess in the head of the fastener is tapered in the longitudinal axis of the fastener, such that the recess is widest at its furthest point from the surface of the head of the fastener, and wherein the recess further comprises one or more lateral tapers extending in a direction transverse to the longitudinal axis of the fastener.
Abstract:
A drive system for a surgical fastener is composed of a drive tool with a drive tip that mates closely with the recess formed in the head of a threaded fastener. The surgical fastener has a head with a quadrilobe fitting therein which closely mates with the quardilobe tip of the tool. The cooperating drive surfaces align the fastener and tool coaxially and produce four point contact equidistant about the circumference of said fastener significantly reducing angular excursions of the fastener during placement in the bone.
Abstract:
A fastener (13) is described having a head (15) formed with a recess (30) which accommodates a square head driver, symmetrical drivers, such as PHILLIPS TM STYLE DRIVER, asymmetrical style cross head drivers, such as POZIDRIV TM style drivers, and combination square and cross drivers without compromising performance of the drivers.
Abstract:
A combination of a screw with a screwdriver bit capable of effectively preventing the cam-out event of the screwdriver bit by improving the formation of a groove part in the cross groove of the screw so as to prevent the screw from being damaged and capable of remarkably increasing a working efficiency by always achieving an appropriate and rapid screw tightening operation even if the cross groove portion of the screw is damaged, and a header punch for manufacturing the screw, the header punch comprising the screw 30 having cutout step parts 36 of generally right triangle shape in cross section provided at the center parts of the tilted groove parts 32a of a bit fitted groove 32 formed in a cross groove at a screw head part 30a and a screwdriver bit 50 having projected parts 56 of generally triangle in cross section matching the cutout step parts formed at the center part of the tilted groove parts of the screw provided at the center part of the tilted end edge parts 52a of a flat-shaped blade part 52 and having the tip faces of the blade part 52 formed as conical projected parts 54.
Abstract:
A combination of a screw and a screw driver bit and a header punch for its manufacture capable of effectively preventing a come-out phenomenon of the screw driver bit by improving the structure of a groove part in a cross groove of a screw to prevent a conventional damage to the screw and remarkably increasing a working efficiency by always achieving a proper and rapid screw tightening operation even if the cross groove portion of the screw is damaged, wherein the screw is formed so that a bit fitted groove formed of the cross groove is provided in a screw head part, a specified tilted groove part is formed in the direction from the end edge part of the bit fitted groove to the center part of a screw neck part, a roughly conical bottom face is formed at a cross center part, the end edge part of the bit fitted groove is formed as a generally vertical end wall part of a specified depth, a groove part with an inclination angle of beta is formed in the direction from the lower edge part of the end wall part to the conical bottom face at the center part of the screw neck part, and the conical bottom face is formed with a gentle inclination angle alpha of approx. 28 DEG .
Abstract:
The invention relates to a screw holder, comprising a longitudinal shaft (1) with a central axis, a back end (2) and a front end (21); and a peg (4) adjoining the front end (21). Said peg (4) also has a front end (6) and a back end (12) and has a polygon-shaped cross-section (8). An elastic element (24) is admitted into the peg (4) in such a way that said elastic element (24) projects over the cross-section (8). This arrangement enables a screw (15) whose screw head (16) has means (14) for accommodating the peg (4), to be clamped tight.
Abstract:
Assembly of screw and screwdriver which are mutually self-gripping and comprising a screw head having slits separated by means of four similar teeth so that the point of a screwdriver in conformity with said slits can be introduced therein. Each slitted section is formed essentially by a base and the two side walls which also form the side walls of the teeth so that the orientation of said side walls in each tooth form an angle therebetween; the centre of said angle is located towards the inside of the screw head so that said angle has a configuration which widens away from the centre of the screw head; the side walls have a slightly oblique configuration which forms a larger width at the lower portion of the tooth in comparison with the upper portion of said tooth. The assembly is also characterized in that the screwdriver has a point which matches the slits of the screw head in order to facilitate the nesting and gripping between said point and said screw head.
Abstract:
A screwdriver blade construction has a tip (20). The tip (20) has a vertical wall (42-45) that is parallel to the blade's longitudinal axis and consequently parallel to the face of a screw groove. The opposite wall (32-35) of the tip (20) is tapered or angled to the vertical wall (42-45) to create a taper. When one inserts the tip (20) into a surgical screw, the tip (20) and screw groove create an interference fit. The vertical face is the driving face, and it lies flat against the face of the screw groove that is driven. This prevents cam-out of the tip (20) from the screw.