Abstract: A femur fixation device includes an intramedullary nail having along its longitudinal axis a proximal portion, a distal portion and a lateral through hole extending through the proximal portion; and a hip screw capable of passing through the lateral through hole. An axis of the lateral through hole intersects the longitudinal axis at a first inclination angle. The proximal portion includes a first through hole. The first through hole is provided with a detachable positioning bracket therein. A positioning protrusion is defined at a lower end of one side of the positioning bracket. A line connecting the positioning protrusion and corresponding end points on a sidewall of the positioning bracket intersects the longitudinal axis at a second inclination angle. An outer surface of the hip screw is provided with a positioning groove. A tail nail is disposed in the first through hole.

Abstract: A screw includes a shank, a head connected thereto, a drilling portion opposite to the head, a first threaded section spirally formed on the shank, and a leading threaded section spirally extending upwards from the drilling portion. The two threaded section are disconnected so that a valley is formed between them. At least one cutting unit protrudes from the valley and has two ends connected to the first threaded section and the leading threaded section respectively. The leading threaded section assists the drilling portion in cutting and drilling into an object while screwing, and the cutting unit protruding from the valley severs fibers which are not cut by the leading threaded section completely to prevent the entanglement of the fibers. The valley helps accommodate and evacuate cut chips. Therefore, the drilling resistance is reduced effectively to increase the screwing efficiency.

Abstract: A flexible bone screw for insertion into the intramedullary cavity of a fractured bone facilitates enduring fixation of the fracture. The flexible bone screw includes a substantially smooth shaft and a threaded portion positioned at one end of the shaft, wherein the outer diameter of the threaded portion is greater than the shaft diameter and the length of the threaded portion is about 20% of the overall length of the flexible bone screw or less.

Abstract: A flexible bone screw for insertion into the intramedullary cavity of a fractured bone facilitates enduring fixation of the fracture. The flexible bone screw includes a substantially smooth shaft and a threaded portion positioned at one end of the shaft, wherein the outer diameter of the threaded portion is greater than the shaft diameter and the length of the threaded portion is about 20% of the overall length of the flexible bone screw or less.

Abstract: The present invention is directed to a foot beam insert. The beam is a cannulated beam having a chamber defined by the hollow space inside the beam. The beam includes holes along the length of the beam that communicate between the hollow chamber inside and the outside of the beam. The beam further includes a groove or grooves in the outside surface of the beam.

Abstract: A multi-thread screw includes a head end, a shank and a tapered end. Both a high thread and a low thread begin on the tapered end and extend onto the shank. A set of intermediate threads are located on the shank portion only and overlap with and intersect at least part of the high thread.

Abstract: A drilling screw contains on its front end facing away from the screw head a drill bit having two drilling cutters. At an axial distance from the drilling cutters the screw shank has a constriction, within which the diameter of the screw shank is smaller than the diameter of the hole produced by the drill bit. The constriction is configured such that it has a shoulder running almost transversely to the longitudinal axis and facing the screw head and from which the diameter gradually approaches again the core diameter of the shank. Within this constriction begins the thread, wherein the thread edge initially has a distance from the longitudinal axis of the screw which corresponds roughly to the radius of the hole. The thread edge then runs along a spiral up to the final outer diameter of the thread on the shank.

Abstract: A fastener including a chisel point that pre-bores a hole in a work piece to prevent damage to the work piece as the fastener advances. The fastener can include a head, a shaft and a chisel brake point formed at an end of the shaft. The chisel brake point can include first and second opposing inclined surfaces disposed at an angle of about 80° to about 150° relative to one another. A thread can begin adjacent the chisel brake point and form an extension of an inclined surface and/or a chisel edge. The chisel brake point can scrape material from a work piece while pre-boring a hole. The material can be transferred to the thread, and subsequently fed up the thread, out of the pre-bored hole. The chisel brake point can also selectively retard advancement of the fastener into the work piece. Methods of installing the fastener also are provided.

Abstract: A fastener includes a shank having a pilot section and a threaded section. The pilot section includes a cutting tip and a drill section; the threaded section includes a first thread region having the same twist as the drill section and a reverse thread region. A helical ridge may be provided in the reverse thread region. A head at the second end includes a top portion such as a disk and an undercut region.

Abstract: A screw with double notches includes a head portion, a shank portion extended outward from the head portion, a threaded section spirally surrounded on the shank portion. Wherein, a raw section on the shank portion is provided with a cambered surface formed integral with the shank portion in cross-section, and a notched section relative to the raw section has two cutting notches separately depressed into the shank portion and disposed near an end of the shank portion, thereby forming a protrudent part between the two cutting notches. By means of the cooperation of the cutting notches and the raw section, the cutting capability and the removal of debris are increased so that a fastened object is prevented from split. Thereby, the drilling speed is promoted, and the effort to rotate the screw is lessened. While the supporting strength of the screw is improved, the screw does not break easily while screwing.

Abstract: A fastener including a chisel point that pre-bores a hole in a work piece to prevent damage to the work piece as the fastener advances. The fastener can include a head, a shaft and a chisel brake point formed at an end of the shaft. The chisel brake point can include first and second opposing inclined surfaces disposed at an angle of about 80° to about 150° relative to one another. A thread can begin adjacent the chisel brake point and form an extension of an inclined surface and/or a chisel edge. The chisel brake point can scrape material from a work piece while pre-boring a hole. The material can be transferred to the thread, and subsequently fed up the thread, out of the pre-bored hole. The chisel brake point can also selectively retard advancement of the fastener into the work piece. Methods of installing the fastener also are provided.

Abstract: A fabricating method for the self-drilling screw has acts of forming a main section and a secondary section by punching, forming a flat drilling blade with a tapered end at a bottom end of the small diameter portion by punching, and forming a thread portion on an outer surface of the main section and a chip removal thread portion with a spiral chip removal groove on an outer surface of the secondary section by rolling. The self-drilling screw utilizes the flat drilling blade with the tapered end and the chip removal section having chip removal function to reduce the size of the drilling blade. Therefore, the self-drilling screw reduces the size of the punching die, lowers the punching force, lowers both the load of the punching die and the load of the punching machine, and lowers both the die cost and the manufacturing cost.

Abstract: A screw has a screw head and a shank. The screw head has a square cavity, a hexagonal cavity or a hexagonal boss to be wedged by a screw driver for wrenching. The shank has a first asymmetrical thread at the taper to facilitate drilling holes, asymmetrical saw-type threads behind the first asymmetrical thread, and a second asymmetrical thread behind the asymmetrical saw-type threads. The shank further has a carved V-shaped tail between the first asymmetrical thread and the asymmetrical saw-type threads to facilitate cutting and debris dispelling. The screw thus formed can rapidly perform thread tapping and debris dispelling, and reduce friction and expand drilling holes and achieve fast fastening.

Abstract: A fabricating method for the self-drilling screw has acts of forming a main section and a secondary section by punching, forming a flat drilling blade with a tapered end at a bottom end of the small diameter portion by punching, and forming a thread portion on an outer surface of the main section and a chip removal thread portion with a spiral chip removal groove on an outer surface of the secondary section by rolling. The self-drilling screw utilizes the flat drilling blade with the tapered end and the chip removal section having chip removal function to reduce the size of the drilling blade. Therefore, the self-drilling screw reduces the size of the punching die, lowers the punching force, lowers both the load of the punching die and the load of the punching machine, and lowers both the die cost and the manufacturing cost.

Abstract: A screw is provided that includes a head from which a shank extends. The shank has an end section at a distal end that includes a drilling portion. A conically-shaped tip potion is disposed at the distal end of the drilling portion and at least one guiding thread is spirally formed on the conically-shaped tip portion. A cutting edge is defined in the drilling portion by at least one groove formed therein.

Abstract: A screw anchor includes a roughly cylindrical body (1) with a drilling portion (3) provided, at its free end, with drilling teeth (14-16), at the other end of the body, a bearing flange (5) and an external screw thread (7). The drilling portion (3) is configured as a portion of a drill bit.

Abstract: A self tapping bolt which fastens a mounting member and a receiving member while the bolt cuts internal threads on an inner surface of a tap drill hole prepared in the receiving member. The bolt includes at least one groove formed near an end of a threaded portion of the bolt and a blade for cutting the internal threads. The bolt includes the feature of the blade being formed only on a rear end surface of the groove relative to a rotational direction of the bolt which is screwed into the tap drill hole.

Abstract: A fastener adapted for anchoring into a masonry structure, such as a concrete block, employs an epoxy resin system so that the fastener is both mechanically engaged and bonded to the structure. In one preferred configuration, the bead is composed of a hardener, a resin and a nylon powder and has a cardioid-shaped configuration which subtends substantially 360° around the shank at an intermediate position of a threaded portion of the fastener. Various configurations are disclosed, including a fastener wherein adhesive in microencapsulated form is also applied to a lower intermediate portion. In addition, wings may extend from the shank.

Abstract: In a joint between two wooden structural members (2 and 3) there is inserted a joint plate (4), whose foot part (5) is joined abuttingly to the wooden structural member (2) by screws (7). The joint plate (4) is pushed into a slot (8) of the wooden structural member (3), whereupon connecting elements (1) are inserted in appropriate number through the wooden structural member (3) and the joint plate (4). Such a connecting element is provided at one of its ends with a boring part (11) and at its other end with a tool drive (12). The worked-off material is received by a portion (14) of smaller cross section and appropriate flutes (13). In addition, an axially secure relationship after setting is achieved with a thread (15) at one end of the connecting element. After it has been finally set, the connecting element (1) is seated in an exact fit as the fixation between the joint plate (4) and the wooden structural member (3) in its self-drilled hole.

Abstract: A screw with a pointed end includes a head, a shank, and a conical end portion formed in a lower portion of the shank. The conical end portion has a drill thread and an incomplete securing thread. The drill thread extends upward from a pointed end of the conical end portion to an upper end of the conical end portion. The incomplete securing thread has its lower end connected to the drill thread so that cut waste may not be hampered by the incomplete securing thread when the screw begins to move into a wooden object and cut and drill a hole therein. Then cut waste may smoothly move out of the wooden object so as not to let it split or tear, with operating twisting force diminished and securing force enhanced.

Abstract: The present invention is a roofing fastener assembly. The assembly includes a fastener, a barbed washer, and a screw. The screw projects through the fastener and exits the free end of the fastener. Upon installation of the screw and fastener, the barbs of the washer penetrate into the roof membrane and insulation layer. An extending rim on the washer receives the head of the fastener to resist the relative lateral movement of the washer and fastener. Stabilizing fingers project from a free end of the fastener and hold the screw in place during assembly.