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7290972 |
Screw anchor for friable material
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...
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7140825 |
Self tapping bolt
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...
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7070376 |
Self-drilling, self-anchoring fastener for concrete
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...
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6669396 |
Connecting element for connecting at least two wooden construction parts and a joint plate
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...
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6308483 |
Roofing fastener assembly
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....
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6164887 |
Screw for joining thin workpieces
A screw comprises a shank (2) and a head provided with a tool drive (6). The shank is provided with a thread (4), and at its free end has a boring part (5). The head (3), measured in axial...
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6109851 |
Screws having selected heat treatment and hardening
A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one embodiment, an upper portion of the screw head is selectively...
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5944295 |
Combination wall anchor fastener and fixture
An outwardly threaded, hollow cylindrical wall anchor with a flange at its proximal end and a cutter at its distal end and a workpiece having an aperture through which the anchor is threaded while...
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5882161 |
Self-drilling and thread-forming screw having a flow-forming section
A self-drilling and thread-forming screw comprises a threaded shank, a drilling section arranged in front of the shank and having a uniform diameter, and a thread-free flow-forming section widening...
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5662673 |
Surgical trocar and method for placing a trocar sleeve in a body wall
A safety incising instrument for helically incising a pathway through a body wall at a controlled rate without exerting longitudinal forces on the instrument. The instrument incorporates a helix...
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5046905 |
Winged drill screw
A self-drilling and thread forming fastener for fasting a first softer workpiece, such as wood, to a second harder workpiece, such as metal, is described. The fastener features wings of improved...
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4978350 |
Transcutaneous pin for fixation of a bone part or fragment
A transcutaneous fixation pin includes a threaded portion with flutes evenly spaced over the circumference of the pin at the anterior end of the threaded portion so as to perform a tapping...
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4793756 |
Tapping screw
A tapping screw includes a screw head, a self-tapping thread portion and a drilling point. The drilling point has a pair of approximately axially extending flutes which are located diametrically...
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4787792 |
Drill screw
A drilling and thread forming fastener is provided having a pilot end with a cutting tip and a pair of flutes formed thereon. The flutes define the length of the pilot end, which is tapered in one...
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4697969 |
Wood screw
An improved wood screw which is self drilling. The wood screw has a first spiral flute that extends essentially the full length of the screw. The screw also has a second spiral flute which begins...
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4583898 |
Drill screw and cutters for making same
A self-drilling and self-tapping screw with a compound flute configuration having a straight portion including at least part of the cutting edge and a curved portion defining the drag surface....
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4407620 |
Drill screw
A drill screw comprises an elongated threaded stem having a driving head at one end and a drill bit at the opposite end, the drill bit having a pair of axially extending flutes located oppositely...
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4395173 |
Drill screw with protective burrs
A drill screw having protective burrs on the cutting edges. These burrs preserve the sharpness of the cutting edges against heavy plating buildup which can have detrimental effects on performance....
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4114507 |
Drill screw
A drill and thread forming threaded fastener having a roll threaded shank constructed at one end for selective engagement with a driving tool, a forged drill point at the other end of the shank...
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4034641 |
Self-drilling and tapping masonry anchor
A self-drilling and tapping anchor for use in masonry structures which includes an upper, tapping thread portion and a lower, stabilizing and dust receiving shank portion intermediate the tapping...
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3937120 |
Drill screw
A thread forming screw is disclosed having a pilot-drilling tip in which two longitudinal flutes are provided with generally flat and substantially coplanar radial walls defining side cutting...
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3933075 |
Self-drilling fastener and method of making same
A self-drilling fastener includes a shank having a drill tip integrally formed on one end thereof and a head on the other end. The drill tip is defined by two concave grooves formed one on each...
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3789725 |
SELF-DRILLING AND SELF-TAPPING FASTENER AND METHOD OF MANUFACTURE THEREOF
This improved non-walking, non-skittering self-drilling and self-tapping screw fastener is manufactured by a simplified, versatile method comprising pointing and fluting steps involving axial...
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3786713 |
CHIP BREAKER DRILL SCREW
A drilling and thread cutting screw having a drill point including generally concave surfaces forming flutes therein with discrete obstructions formed on the concave surfaces to effectively break...
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3738218 |
DRILLING AND THREAD FORMING FASTENER
This improved non-walking, non-skittering drilling and thread forming fastening screw, which may be manufactured by simplified, versatile techniques, features a pair of oppositely disposed,...
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3710676 |
SELF-DRILLING AND THREAD-FORMING SCREW
A fastener of the type having a drilling end followed by a thread forming part to form threads in the drilled hole, and secure itself into the threads thus formed. The drilling portion is of unique...
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3665801 |
DRILL SCREW
The drill screw comprises a drill tip, a threaded shank and a head. The drill tip is in two sections, the first of which is a pyramidal shaped entry section, and the second of which is a trailing...
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3136205 |
Self-tapping wood screw
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