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Masonry anchor device

a technology of anchor device and masonry, which is applied in the direction of threaded fasteners, screws, fastening means, etc., can solve the problems of brittle failure, premature failure, and failure of masonry tapping fasteners

Inactive Publication Date: 2011-03-08
ASIA FASTENING US
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention is a new fastening member designed for attachment of various fixtures and equipment to masonry, concrete, and other hard and / or friable substrates. The fastening member has several technical effects including higher torque differential, more reliable, and usable in a wider variety of substrates. It also has less overall axial movement and higher radial loads on the substrate, resulting in higher pullout values. The fastening member provides a more uniform stress distribution and higher resistance to dynamic loads, system impacts, and vibrations. Overall, the fastening member provides an improved and more ductile anchorage to the substrate."

Problems solved by technology

These masonry tapping fasteners have failed for a variety of reasons, such as stripping out during the installation process, brittle failure while resisting the applied loads, and premature failure due to embrittlement and stress corrosion.

Method used

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Embodiment Construction

[0016]While the invention may be susceptible to embodiment in different forms, there is shown in the drawings, and herein will be described in detail, a specific embodiment with the understanding that the present disclosure is to be considered an exemplification of the principles of the invention, and is not intended to limit the invention to that as illustrated and described herein.

[0017]The present invention provides a novel anchor device or fastening member 20 which is particularly suited for use in the attachment of various fixtures and equipment to masonry, concrete, and other hard and / or friable substrates (not shown). The fastening member 20 may be a screw.

[0018]The fastening member 20 includes a head 22 which has a shank 24 depending therefrom. The head 22 may take a variety of forms and is dependant on the application. As shown in FIG. 1, the shank 24 includes an unthreaded portion 26 which extends from the head 22, a first threaded portion 28 which extends from the unthrea...

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PUM

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Abstract

An improved anchor device or fastening member which is particularly suited for use in the attachment of various fixtures and equipment to masonry, concrete, and other hard and / or friable substrates includes a head and a shank depending therefrom. The shank has a first threaded portion having a predetermined thread angle and a predetermined hardness, and a second threaded portion having a predetermined thread angle and a predetermined hardness. The first threaded portion is proximate to the head and the second threaded portion extends from the first threaded portion. The thread angle of the first threaded portion is different than the thread angle of the second threaded portion. In addition, the hardness of the first threaded portion is softer than the hardness of the second threaded portion. This provides for a more ductile anchorage when the fastening member is engaged with the substrate.

Description

BACKGROUND OF THE INVENTION[0001]This invention is generally directed to a novel anchor device or fastening member which is particularly suited for use in the attachment of various fixtures and equipment to masonry, concrete, and other hard and / or friable substrates.[0002]The prior art in one-piece, masonry tapping fasteners have uniform thread forms throughout the entire length of the fastener. They are typically heat treated to a case hardened metallurgical structure. These masonry tapping fasteners have failed for a variety of reasons, such as stripping out during the installation process, brittle failure while resisting the applied loads, and premature failure due to embrittlement and stress corrosion. As a result, users of these fasteners have been required to use other styles of fasteners that have exhibited better load versus displacement characteristics than that of a masonry tapping fasteners. These fasteners also back out of the substrate with relative ease in applications...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16B35/04F16B25/00F16B33/02
CPCF16B25/00F16B25/0026F16B25/0078F16B25/0052F16B25/0047
Inventor JANUSZ, MICHAEL
Owner ASIA FASTENING US
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