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| Number | Title | Issue Date |
| 7494311 | Undercut screw and matching bit A threaded fastener, such as a screw or a bolt, has a central longitudinal axis in a z-axis direction. The fastener has a head and a threaded shaft. The head has an overhanging periphery in an x-y plane and at least two slots, evenly-spaced apart, that extend comple... | 02/24/2009 |
| 7311026 | Strip resistant screw head and screwdriver tip in combination A screw head and screwdriver for use in combination are provided to reduce the occurrence of stripping a screw head during tightening or removing the screw. The head slot employs slot walls that indent in some portion of the wall, the indent portion forming a ledge ... | 12/25/2007 |
| 7293949 | Spiral drive fastener with friction engageable surface Interference surfaces are constructed on inner transition surfaces between wings of a fastener having a spiral recess. A portion of the transition surface is tapered to provide the interference. A standard driver for a spiral recess will engage the interference surf... | 11/13/2007 |
| 7255522 | Spiral drive fastener with engagement ramp The fastener of this application is designed to facilitate the insertion of rotating power driven tools into the fastener recess. The recess of this fastener generally uses spirally configured driving surfaces and is formed in a counterbore in the upper surface of t... | 08/14/2007 |
| 7198306 | Spring-biased locking bolt A spring-biased locking bolt with an operating button and a bolt connected with the operating button is described, wherein the bolt is spring-biased and movable in a sleeve. The sleeve is screwed into a corresponding opening in a machine part or an item of furniture... | 04/03/2007 |
| 7165482 | Fastener and driving tool with retaining blade A combination fastener driver and fastener, the fastener driver including a generally hourglass-shaped tip which flares from the shank to the tip and the fastener includes a generally hourglass-shaped slot in the fastener head with under cut side walls. The flared w... | 01/23/2007 |
| 7137768 | Fastener assembly A fastener assembly including a stud and plate combination is disclosed for fastening a first member to a second member. The assembly comprises a stud which includes a shank having a first and a second end. A head extends from the first end of the shank, the head de... | 11/21/2006 |
| 7013767 | Screwdriver/screw unit A screwdriver element includes two bits, each with a sinuous distal tip end and a screw element includes a head having an X-shaped slot that has sinuous side walls. The bit distal tips have a left-handed shape and a right-handed shape and the side walls of the screw... | 03/21/2006 |
| 6988432 | Multi-tiered-recess screws A screw and driver system includes a range of screws and a driver. Each screw has a head having a driving recess in its surface for engagement by the driver. The recess of larger screws in the range have a plurality of superimposed recess tiers of decreasing size wi... | 01/24/2006 |
| 6620167 | Orthopedic screw having driver-locking head According to this invention an orthopedic screw having a first portion and a second portion is disclosed, wherein said first portion comprises a head having a substantially smooth exterior surface and further comprising a recessed portion, wherein said re... | 09/16/2003 |
| 6526851 | Undercut screw and matching bit A screw has a head portion and a threaded portion. The head portion has an undercut slot extending across it. The slot has a flat floor and sloping sides and the width of the floor of the slot is greater than the width at the top opening of the slot. A ma... | 03/04/2003 |
| 6361258 | Permanently placeable fasteners, inserter head for fastener placement and related methods Fasteners and devices and methods for placing fasteners in a workpiece are disclosed. More particularly, non-removable permanently-placeable fasteners for placement in a workpiece to hold elements thereof together, permanently-placeable but removable fast... | 03/26/2002 |
| 6345472 | Apparatus and method for anchoring and erecting concrete or similar materials An apparatus for use in concrete construction is characterized by a body having a first portion configured to be set into concrete during the casting of that concrete, and which can be removed from the concrete after the concrete has set, and thereby may ... | 02/12/2002 |
| 6148699 | Screwdriver and screw A screwdriver has a shaft with a bit on one end for engaging a bit receptacle formed on a head of a screw and a screw engaging device coupled to and in surrounding relation to the shaft. The screw engaging device defines a cylindrical void configured to r... | 11/21/2000 |
| 5851096 | Racheted nut assembly A ratcheted nut assembly is provided to enable a nut to be tightened onto a bolt in a limited area. The ratcheted nut assembly includes an internally threaded nut that has radially extending teeth on its outer surface. The nut is held rotatably captive wi... | 12/22/1998 |
| 5722838 | Fastener system and method of manufacture thereof A fastener system includes a fastener and a driver tool in which the fastener includes a cavity for insertion of the driver tool and in which the driver tool and the fastener form an interlocking relationship between the driver tool and the fastener is fo... | 03/03/1998 |
| 5697743 | Tamper proof threaded fastener A tamper proof threaded fastener construction (10) comprising a conventional elongated threaded fastener body member (20) having an enlarged head member (30) provided with a contoured and tapered frangible member (40) which is used to drive the fastener c... | 12/16/1997 |
| 5647253 | Method and apparatus for a theft resistant fastener This invention relates to a method and apparatus for fastening two members together with a theft resistant screw having a head with a top surface which is free of any engageable indentations or protrusions, with an independent means to drive the screw.... | 07/15/1997 |
| 5582548 | Method of manufacture of anti-slip fastener A fastener system includes a fastener and a driver tool in which the fastener includes a cavity for insertion of the driver tool and in which the driver tool and the fastener form an interlocking relationship between the driver tool and the fastener is fo... | 12/10/1996 |
| 5562547 | Self-attachment screw The present invention relates to a burred fastener for forming a friction fit between the fastener and a driver. The friction fit retains the fastener in contact with the driver during insertion, tightening and loosening of the fastener into a work surfac... | 10/08/1996 |
| 5484440 | Bone screw and screwdriver A bone screw screwdriver and method for securely, positively locking a bone screw to the screwdriver. The screwdriver includes an extending handle through which a drive rod is slidingly disposed. A tongue at one end of the drive rod interlocks within a gr... | 01/16/1996 |
| 5438895 | Fastener and driving tool A fastening system comprises a driving tool formed with a rectangular-shaped bit at its driving end, and a fastener such as a screw whose head is formed with a recess defining a central slot and four spaced undercuts each having parallel upper and lower w... | 08/08/1995 |
| 5439339 | Externally threaded interference fit fastener with oppositely threaded puller An interference fit fastener and threaded puller attachment in combination. The fastener has a shank with an external thread and an axial recess with an internal thread, the threads being of opposite hands. The puller attachment is threadly engaged to the... | 08/08/1995 |
| 5366330 | Fastener head with internal recess having a radial slot configuration and installation tool therefor A fastener head having a pair of recesses formed therein, a ledge in each recess being located a short distance axially below the head surface and extending a predetermined angular length from the axial portion of the ledge. The dimension of the ledge is ... | 11/22/1994 |
| 5338142 | Rotating quick release mechanism for securing parts to bicycles A quick release mechanism for securing a part to the frame of a bicycle. The mechanism includes an axially elongated skewer element adapted to be mounted to the frame. A fastening element is rotatably mounted on the skewer element for securing the part to... | 08/16/1994 |
| 5269208 | Tamper-proof fastener and a driver tool therefor A tamper-proof fastener provided with a threaded shank and a low-profile drive head integral therewith. The drive head has a generally frusto-conical shape defining a circular flat top and a circular base of larger diameter, three short noses separated 12... | 12/14/1993 |
| 5203742 | Punch for making such screw heads with slant rib A punch is provided for making a screw head with ribs on some of the driver surfaces. The punch includes a slanted groove for providing a rib which is slanted from the screw axis by a small angle between 1° and 10°.... | 04/20/1993 |
| 5120173 | Screw head with slant rib A screw head is provided with ribs on some of the driver engageable surfaces. The rib is slanted outwardly from the screw axis by a small angle between 1° and 10°.... | 06/09/1992 |
| 5116337 | Fixation screw and method for ligament reconstruction A screw for fixation of a tendon/bone graft during an arthroscopic surgical procedure includes a smooth conical forward end having a rounded tip and a spiral thread running from a position behind the smooth rounded forward end to a rearward end of the scr... | 05/26/1992 |
| 5098238 | Fastener with internal threaded installation means A fastener for use in fatigue resistant structures such as aircraft wings. The fastener is installed into interference fit by tool engagement in a tapped hole coaxial with the threaded end of the pin, at the threaded end of the fastener pin. The tapped ho... | 03/24/1992 |
| 5079935 | Trapped key lock mechanism A lock operable by a key between a locked condition and an open condition, the lock having a fastener for releasably securing the lock to an object, the fastener being movable between a retracted position wherein the lock is in the open condition and an e... | 01/14/1992 |
| 5017069 | Sleeve bolt A sleeve bolt for coupling together workpieces including a cylindrical sleeve having a cylindrical outer surface and an axial bore with a radially interior surface of polygonal configuration at one end and internal threads at the other end. An inner slide... | 05/21/1991 |
| 4938108 | Theft-resistant fastener system A theft-resistant fastener system includes a rotatable wrench adapted to engage a head portion of a fastener and to rotate that fastener and head portion about a fastener axis. The wrench and fastener jointly have at least three ball-and-socket joints dis... | 07/03/1990 |
| 4936172 | Interlocking screw and screwdriver A screwdriver and mating screw are shown with interlocking features for coupling with one another to facilitate driving the screw into a workpiece. The screwdriver includes a handle and a blade with an engagement flange on the outer extremity of the blade... | 06/26/1990 |
| 4911593 | Ratchet driven threaded fasteners A threaded fastener organization is set forth wherein an axially threaded shank includes an enlarged overlying head wherein the head is provided with a square prismatic recess formed through an upper surface of the head and wherein the recess is formed wi... | 03/27/1990 |
| 4856953 | Hook-driven screw with replaceable hook A combination of a screw with a hook includes a screw fixed on a wall having a pair of longitudinal grooves formed in a cylindrical hole in the screw, and a hook having a cylindrical shank with a pair of longitudinal extensions engageable with the two lon... | 08/15/1989 |
| 4685848 | Gear headed fastener and drive tool structure A rotatable fastener has a head portion with an axially facing ring gear engageable with a complementary gear of a drive tool. In a preferred embodiment, the ring gear is a rearwardly facing beveled gear for use with a beveled drive gear and the head port... | 08/11/1987 |
| 4615554 | Screw-in fastener for a tubular anchor embedded in a concrete element A screw-in fastener for an anchor embedded in a precast concrete element includes a coupling member, to which a transport anchor is applied, a threaded pin insertable into the anchor positioned within the concrete element, and a supporting plate, from whi... | 10/07/1986 |
| 4572039 | Interlocking lock screw with screw driver An interlocking lock screw and screwdriver which prevents the specially designed screwdriver blade with guide dimples from slipping out of a specially designed screw head with a screwdriver guide channel and guide dimple entry apertures. The screwdriver m... | 02/25/1986 |
| 4539874 | Tool driver and fastener apparatus A tool driver and fastener that prevents the driver from lifting up off the fastener. The fastener has at least one undercut slot that matches with a blade on the driver to prevent uplift. The driving tool and fastener mate with one another and have respe... | 09/10/1985 |
