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7618327 |
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...
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7404769 |
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...
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6786827 |
Punch and manufacturing method for recessed head fastener
Recessed head fasteners are provided with a configuration by which the force applied by the blades of the driver to the recessed wings is applied at the radially outer regions of the wings. The...
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6755748 |
Screw head formation
The screw has two or three non-circular super-imposed recesses. The depth of each recess is less than 1.2 mm and there is a less than 1° of draw in each recess. The screw head recess is formed ...
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6648766 |
Cool-wrought pressing forming method for slotted headless screws
A cool-wrought pressing forming method for slotted headless screws includes five steps of using five different molds and five pressing heads for processing a unit of screw material cut from linear...
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6406376 |
Compound screw drive recesses mold
A screw drive recess mold for forming screw drive recesses which has a body and a mold base. The mold base consists of four symmetrical fan-shaped protrusions and a center square protrusion. Four...
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6390929 |
Method for making drive sockets
A method of making a recess in a drive socket and the like includes forming a groove to extend along a face of an elongated drive opening in a metal workpiece from one end of its drive opening,...
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6234914 |
Punch for forming threaded fasteners with spiral drive
A spiral drive system for threaded fasteners includes driver-engageable surfaces on the head end of the fastener in which at least some of the driver-engageable surfaces are defined by a spiral...
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5904623 |
Apparatus for forming a slot in a semi-product of a bolt prior to thread formation
An apparatus for forming a slot in a semi-product of a bolt prior to thread formation includes a punch and a die mechanism. The die mechanism includes a tubular member, and an elongated die member...
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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...
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4670927 |
Method and apparatus for forming the head of a high torque fastener
An improved high torque fastener is provided of the type having a screw head with a generally bow-tie shaped driving slot formed with undercut side walls and an arcuately concave bottom wall for...
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4160300 |
Hammer for forming an undercut fastener driving slot
An improved hammer used in the first step of a two-step method for forming an undercut fastener driving slot in the head of a fastener, such as a screw or bolt, that results in an arcuate, recessed...
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4151621 |
Tools for punching fastener heads
A punch for forming a screw head is provided with grooves which will form projections on selected of the driver-engageable surfaces of the head. The projections are arranged to interlock with...
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4126908 |
Threaded fastener recess forming punch
A screw having a head and a threaded shank and, in the head, a cruciform shaped recess comprising a central cavity and four grooves radiating from the central cavity at 90° angular spacings, the ...
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4033003 |
Head forming method
A method of providing an undercut "bowtie" slot in the head of a fastener such as a screw or bolt, and the resulting interim and final fastener products. The method consists of only two heading...
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4028918 |
Assembly for applying lubricant to the working area of a punching device
Device for applying lubricant to the workpiece and/or working surface of the punch of a multistage forging press. Channels are provided between the stepped holding pin of the punch and the wall of...
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3972083 |
Punch for making recessed screw
A tapered punch for producing a recessed screw, the punch having an axially extending recess forming portion of symmetrical cross section and presenting in cross section 8 symmetrically disposed...
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3945071 |
Apparatus for cold forming recesses in the heads of screw fasteners
A recess is formed in a screw head by a cold forming technique employing a two piece punch which includes an outer member having an axial bore formed therethrough which receives and carries an...
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3898706 |
Method of forming a recess in a fastening element head
A method of forming a centrally located axially outwardly directed cruciform recess comprising a plurality of intersecting flat-bottomed slots having their ends closed-off in the end face of a...
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3858261 |
PUNCHING TOOL FOR FORMING A CROSS-RECESS OF A SCREW
In a cross-recessed screw forming punching tool having four ridges substantially orthogonally intersected, each ridge is circumferentially inclined at a predetermined angle to a respective radial...
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3747142 |
BROKEN TOOL DETECTOR
A broken tool detector utilized to check for the presence of any protrusion on the face of a tool, such as the second blow punch on a two blow header or similar machine, where the detector includes...
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3611462 |
METHOD OF MAKING HEX HEADED BOLTS AND SCREWS
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3471878 |
PUNCH AND DIE DEVICES
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3453972 |
APPARATUS FOR FORMING UNDERCUT SCREW HEAD SLOTS
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3439413 |
METHOD FOR PRODUCING DRIVING TOOLS FOR RECESSED HEAD FASTENERS
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3388411 |
Method and apparatus for forming undercut screw head slots
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3310822 |
Method and apparatus for making socket head screws
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3304561 |
Apparatus for forming the head on a flat head screw
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3238540 |
Punch means for forming recesses in fastener heads and driving tools for said fasteners
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3182342 |
Method and die set for forming socket heads
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3177506 |
Punch and die for upsetting and socketing screw head
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3166769 |
Method and apparatus for heading a fastener
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3151519 |
Screw head recess, method of making the same, and punch for use therein
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3120012 |
Tools for punching recessed head fasteners
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3108623 |
Tools for recessed head fasteners
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3089159 |
Process for forming a fastener including the step of piercing an unworked head portion
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3088140 |
Method of forming blanks with internal and external torque engaging means
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3028781 |
Recessed head fastener with oblique recess
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2986752 |
Methods of forming by punching a cruciform recess in a headed fastener
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2977838 |
Square-recessed screws and punch means for making same
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