 Stand, particularly for an umbrella table |
| OF THE PREFERRED EMBODIMENT Referring now to the drawings, and more particularly to FIG. 1, an ... |
|
| Frame assembly using master rib with positionable cleats |
| I claim: 1. A frame assembly, comprising: (a) a master rib extending a given length in a ... |
|
| Stand for removably mounting pole supproted furniture to a deck |
| Referring now to the drawing figures there is seen in FIG. 1 an umbrella pole stand 10 mounted to ... |
|
| Pipe support apparatus |
| Generally speaking, this invention fulfills the above-described needs in the art by providing: a ... |
|
| Foldable stand |
| It is, therefore, an object of the invention to provide a foldable stand that my be easily opened ... |
|
| Interior rear view mirror mounting system utilizing one-package structural adhesive |
| The embodiments of the invention in which an exclusive property or privilege is claimed are defined ... |
|
| Apparatus for use in mounting a tubular structure on a vehicle fender |
| The present invention provides an apparatus for use in mounting a tubular structure, such as a ... |
|
| Automatic electrochromic control of light level of vacuum fluorescent display |
| The objects and purposes of the invention are met by providing, in a vehicle having instrumentation ... |
|
| Manufacture method for micromechanical devices |
| The described embodiments of the invention is a method for manufacturing micromechanical devices. T... |
|
| High numerical aperture ring field projection system for extreme ultraviolet lithography |
| It is recognized in the present invention that multilayer coatings are formed to optimally reflect ... |
|
|
Screw fastener
| Details |
Inventors: Henriksen, Arne;
Assignee:
Primary Examiner: Green; Brian K.
Assistant Examiner: Santos; Robert G.
Attorney, Agent or Firm: Hill & Simpson
A threaded fastener for securing a first material to a support member is provided comprising a tapping or tap screw point at a first end, a threaded shank with three separate leads, a first portion of the shank, adjacent to the tap screw point, being of a trilobular thread design, a second portion of the shank, distal from the tap screw point, being unthreaded, and a head at an end opposite the tap screw point having an enlarged diameter and a countersunk shape to reduce the likelihood of pull through of the fastener through said first material, yet to allow the head to be introduced flush with a surface of the first material. |
|
DETAILED DESCRIPTION The present invention provides an improved fastener which has particular utility in securing two items together, such as a wood, plastic material, aluminum or metal wall or other first material to a ferrous metal or aluminum support such as a ferrous metal or non-ferrous channel or frame.
The improved fastener has a tapping point tip to make the screw self-tapping in order to form its own thread in both of the materials it is securing together by displacement of surrounding material rather than cutting of the surrounding material.
A shank of the screw has a first trilobular thread area which rolls threads rather than cutting threads for a tighter fit.
The thread has flats provided at the tip and three threads formed on the shank have beginnings at the tapping point, with one lead starting at each lobe.
Preferably the screw has 18 threads per inch when the shank has a diameter of 5/16 inches and 20 threads per inch when the shank has a diameter of 1/4", thus resulting in a thread angle (when viewed from the side of the fastener) of about 11 degrees to provide a thread which will cause the fastener to be drawn into the material quickly, however, not so fast as to prevent the fastener from being able to cut into metal and to pull itself into the metal.
The threads continue along the shank from the tip, but stop short of the head at an unthreaded portion of the shank.
Above the threaded portion of the shank and the unthreaded portion is the screw head which has an enlarged diameter to prevent the head from pulling through the first material.
Preferably the head is a countersunk style head which will allow the head to be drawn down into the first material until it is flush with the surface of the first material.
Also, the head has a drive recess which preferably is a 6 lobe recess to give the fastener ease of driving without cam out and prevent unauthorized tampering with the fastener once it has been threaded into place.
Once the fastener is driven into place, the angle of the thread offers higher break loose torque to prevent the part from coming out under vibration
|
| Related patents |
|
|
Tamper reistant fastener
In a preferred embodiment, the present invention provides a tamper resistant fastener which can only be rotated with a specific key. The fastener includes a head for ...
|
|
|
Lock for preventing inadvertent removal of a first frame component of an adjustable storage system from a second frame component of the adjustable storage system and the adjustable storage system
OF THE PREFERRED EMBODIMENT Referring now to the figures, in which like numerals indicate like parts, and particularly to FIGS. 1 and 2, which are, respectively, a ...
|
|
|
Anti-tamper nut
To address these and other drawbacks, the present invention provides a device for securing a first element to a second element that uses a nut. The nut has the large ...
|
|
|
Subgrade vault
OF THE INVENTION As best shown in FIG. 8, a vault 20 according to this invention comprises a body 21, a lid 22, a clip 23 and a fastener 24. When the lid is brought ...
|
|
|
Formwork system for forming transitions of reinforcement between concrete components and/or as termination of concrete formworks
I claim: 1. A formwork system for forming a transition of reinforcement between a concrete component and an adjacent concrete component in a connecting direction or to a ...
|
|
|
Carton with pour spout
In the subject invention, the carton blank has a generally half-circular line of perforation extending in the outer top panel and an end panel joined to the outer top ...
|
|
|
Aircraft ground floodlight
OF THE INVENTION Referring now to FIG. 1, a plan view of an aircraft 10 having a ground floodlight according to the present invention is shown. Aircraft 10 includes a ...
|
|
|
Stand for clamping rod-shaped parts
What is claimed is: 1. A stand for clamping a rod-shaped part comprising a foot part having a seating region for an end of the rod-shaped part, the seating region being ...
|
|
|
Windscreen sensing and wiper control system
A system for detecting moisture on the windscreen of a motor vehicle has an illumination source and a light sensor mounted within the motor vehicle. The light sensor ...
|
|
|
Glassmastering photoresist read after write method and system
The object of the invention is to provide a glassmastering photoresist read-after-write method and system that, while keeping all the advantages of the prior art methods ...
|
|
|
Lighting 
