13574results about "Bolts" patented technology

A biodegradable interference screw for directly affixing a transplant to a bone, the interference screw being provided with at least one longitudinal groove designed to co-act with a tool for insertion of and if necessary, removal of the interference screw from an opening provided in the bone to receive both the transplant and the interference screw.

A Bone screw for anchoring a marrow nail with transverse bores in a tubular bone. The bone screw had a thread with a pitch S, a core diameter D1 and outer diameter D3. The screw supports the marrow nail with a middle part and is fixed in the bone with a distal part. The thread has a flat cylindrical thread base with a length l>0.3 S. In addition, a second thread with the same pitch S and with the core diameter D1 is present in a proximal head part, but has a greater outer diameter D2>D3 in order to proximally achieve a fixing with a greater thread profile.

A spinal fixation device combines an open-headed anchor member, such as a bone screw or a hook, with a closure member to thereby clamp a spinal fixation rod to the anchor member. The anchor member has spaced apart arms forming a rod receiving channel. The arms have arm extensions or tabs connected to main portions of the arms by weakened regions to enable the tabs to be broken-off or separated after the rod is clamped. The closure member and inner surfaces of the arms and tabs have helical anti-splay guide and advancement interlocking flanges formed thereon which cooperate to prevent splaying the arms and extensions as the closure member is advanced into the rod receiving channel. The flanges have anti-splay contours which can be formed on load flanks or stab flanks of the flanges. The load flanks can be oriented in such a manner as to aid in the anti-splay characteristics of the flanges or to control the proportioning of axial stresses between the flanges.

The invention provides an electro-optical device that stabilizes display quality by performing correction processing corresponding to a plurality of disturbance factors. Specifically, a grayscale characteristic generating unit can generate conversion data having grayscale characteristics obtained by changing the grayscale characteristics of display data that defines the grayscales of pixels with reference to a conversion table whose description contents include correction factors. A data line driving circuit can drive the pixels after correcting the grayscale characteristics of the conversion data by the correction factors using other processing different from the that performed by the grayscale characteristic generating unit.

A fastener (1) includes a screw (2) and a supporting element (3). The screw (2) includes a head (4), a shank (8) and a threaded portion (12). The threaded portion (12) is located on the shank (8). The threaded portion (12) includes a thread having an outer diameter (14). The threaded portion (12) includes a thread runout (25) facing the head (4) of the screw (2). The shank (8) includes a shank portion (10) having a diameter (11) which is smaller than the outer diameter (14) of the thread. The supporting element (3) is captively connected to the screw (2), and it includes at least one narrow location (27). The narrow location (27) has a diameter (28) which is smaller than the outer diameter (14) of the thread. The narrow location (27) includes at least one surface element (30, 35) facing the thread runout (25) and forming an enveloping cone (31) enveloping the thread runout (25) to prevent the supporting element (3) from getting clamped at the thread runout (25) of the screw (2).

A double shouldered high torque resistance threaded connection for drill stem components having enhanced resistance to torque forces, tensile loads and material stress and fatigue is disclosed. The tool joint is provided with threads having a 75 DEG included angle between the thread flanks thereof and with generally elliptical root surfaces to minimize material stress and fatigue during operation under high torque and high tensile loads. When made up, the double intrerengaging shoulders of the threaded tool joint are in firm face to face engagement permitting torque forces and tensile loads to propagate through the tool joint in a manner that minimizes bending forces and minimizes high stress concentration so that the resulting service life of the tool joint is significantly enhanced.

An externally threaded fastener having an externally threaded shank, a concave head connected to the shank and axially aligned with the shank, and a drive stud connected to the head and axially aligned therein.

A mixture of crosslinkable liquid-crystalline substances having a chiral phase (LC mixture), containing polymerizable groups, where at least 90% of the polymerizable groups are part of molecules containing at least two polymerizable groups (crosslinker molecules), wherein from 3.2 to 15 mmol of polymerizable groups are present per g of LC mixture. The crosslinked pigments show little color shift in the presence of solvents or upon application to substrate different temperatures.

A fastener includes a round, blind hole or pocket in its head. Installation and removal of the fastener is accomplished with a tool containing an eccentric segment on the end of a shaft. When rotated within the pocket, the eccentric segment displaces laterally relative to the shaft to provide a friction grip to the lateral wall of the pocket. The strength of the grip is proportional to the applied torque. Eccentric displacement allows rotation but prevents the tool from spinning out of the fastener thereby eliminating cam-out and surface damage resulting from contact with a spinning tool tip. The eccentric head of the tool can be made disposable and to shear off when a predetermined torque is reached. The smooth-sided round hole offers no purchase for commonly available tools; making the fastener tamper-resistance. In another embodiment, the fastener includes a raised portion in the pocket. A tool having a complementary opening shears off the raised portion at a predetermined torque.

The invention relates to a coated dental screw for retaining and securing components of a dental prosthetic implant stack. The screw is coated with a hard carbon coating / film to provide a low friction surface finish which advantageously results in improved preloading of the screw, and hence a high clamping force between the components of the dental prosthetic implant stack. The coating can comprise diamond-like carbon (DLC), amorphous diamond, crystalline diamond, or a combination thereof. The dental screw can include abutment retaining screws and prosthesis retaining screws. Other advantages provided by the hard carbon coating include high mechanical surface hardness, biocompatibilty, corrosion resistance, chemical inertness and low cost.

A bone screw retaining system including an implant adapted to be applied the anterior human cervical spine for contacting anterior aspects of at least two cervical vertebral bodies, the implant having a plate that defines a plurality of transversely extending bores that extend along a longitudinal axis between an anterior surface and a posterior surface, each bore being configured to receive a bone screw for engaging the plate to the cervical spine. An elastically deformable spring member positioned therein a cavity of the plate such that portions of the spring member can extend into a portion of an upper region of each of the bores of a pair of opposing bores, the spring member being movable between a first relaxed, expanded position and a second, compressed position. In the first relaxed position, at least a portion of the spring member extends outwardly substantially transverse to the longitudinal axis of the bore and into the upper region of the bore and, in the second position, portions of the spring member are medially biased away from the longitudinal axis of the bore toward the outer wall of upper region of the bore, which increases the effective inner diameter of the upper region of the bore.

A fastening element capable of being attached to a panel by deforming the panel is disclosed. A barrel portion is tubular with an open free end and has an axis defining a circumference. A radial flange portion is integral with the tubular barrel portion opposite the free end and defines a circumferential surface. The radial flange portion includes a plurality of projections spaced apart and extending outwardly from the circumferential surface. Each of the projections defines at least one wall generally perpendicular to the circumference about the axis of the barrel portion.

A suture fixation apparatus having a first body portion having a bone engaging feature to fixedly engage a bony tissue and a second body portion defining an eyelet for receipt of a suture. The second body portion is rotatable with respect to the first body portion. Rotating the second body portion causes the suture to form a twist to frictionally secure the suture.

A clamping nut suitable for co-operating with a threaded shank of an osteosynthesis appliance, the nut including an annular body and a tapped bore for cooperating with the threaded shank. The annular body is provided with a structure which enables turning the body and with a transverse bearing face. The osteosynthesis nut further includes a ring mounted in a housing of the annular body which is provided internally with the tapped bore, and which cooperates externally with the annular body.

A nut assembly is disclosed that will ensure that the shank of a bolt that features a measurable grip length will pass through the contact plane of adjoining members. The nut assembly also allows the desired compressive force in the adjoining members to be attained by using a telescopic feature of the nut to allocate additional thread action for the bolt, enabling the bolt to be drawn into the nut further than what would be allowed by a standard nut. The adaptability of the nut assembly can eliminate the need for washers or shims to adjust the shank penetration of the bolt. The nut assembly is useful for application in which the specified thread length and the grip length of the bolt is incompatable with the abutment thickness of the adjoining members.

A positive locking fastener for inhibiting rotation of a nut located on a shaft of a threaded fastener, the positive locking fastener comprising: a first plate and a second plate receivable on the shaft, wherein at least one of said plates is rotationally fixed relative to the shaft; a locking assembly axially coupling said first plate to said second plate, said locking assembly including an opening formed in said second plate and a projection extending axially outward from said first plate, wherein said projection is adapted to extend through said opening and overlap a portion of said second plate; and a nut receiving aperture formed on one of said plates having a nut engaging member adapted to rotationally couple the nut to said plates, whereby the nut is rotationally fixed relative to the shaft to inhibit rotation of the nut.

A wildlife guard for electrical power distribution equipment has two hingedly mounted sections which close together to form a protective cover at the top of an insulator bushing on electrical equipment. The wildlife guard is adapted by its structure to fit a range of bushing sizes and yet provide structural integrity and reliable protection once in place. The wildlife guard also accommodates passage of conductive members such as electrical conductors and sparkgap bars through the cover at locations governed by actual field conditions. The wildlife guard has a cover locking mechanism allowing its easy removal when desired.

The present invention relates to a connection between a spindle and a bearing assembly to retain the bearing assembly on the spindle. A combination lock washer and spindle bearing assembly is provided to include a spindle, thrust washer, lock washer and nut in which the lock washer simultaneously locks the inner thrust washer and an outer spindle nut. According to the present invention, the thrust washer, lock washer and nut may be oriented at any angle relative to one another allowing for infinite bearing adjustment positions.

A fastener adapted to pass through aligned holes through workpieces is disclosed. The fastener includes a pin member having a transition portion wherein the diameter of the transition portion decreases radially as it extends from the smooth cylindrical shank portion to the threaded portion. The fastener may also comprise a sleeve member and a clamping means. The clamping means includes a collar, a nut, or any other possible clamping means. In exemplary embodiments, the workpieces can be formed with a plurality of materials, the materials including composite, metallic, or composite / metallic structures, any combination thereof. In particular embodiments, the fastener has interference capability of 0.0005 to 0.0100 inches in composite structures without risk of composite delamination or damage. As a result of the fastener interference, gaps between the fastener and the structure are eliminated thereby providing good electrical conductivity between components. As a result, the potential for electrical sparks is reduced, providing a safer fastener for use with aerospace applications.

A bonding washer for making electrical connection between two metal pieces that are to be mechanically fastened together. The washer, to be interposed between the two metal pieces, is constructed so as to fasten to one of the pieces before the two pieces are joined. Teeth on the washer, positioned at right angles to the plane of the washer, are forced into each of the two metal pieces when the fastener is tightened, making electrical connection between the two metal pieces.