Large diameter tapcon with debris reservoir end or tip

Details Large diameter tapcon with debris reservoir end or tip Large diameter tapcon with debris reservoir end or tip

2000-09-05

2001-10-02

Dayoan, B. (Department: 3627)

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

C411S387200, C411S412000

Reexamination Certificate

active

06296433

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to fasteners, and more particularly to a masonry anchor which is provided with a uniquely structured debris reservoir end whereby installation of the anchor fasteners within, for example, pre-drilled bores defined within masonry materials is rendered easier and faster as a result of a significant reduction in the installation torque due to the proper sizing of the bore and the accumulation and efficient discharge of masonry or concrete dust or debris generated during a self-tapping or reaming operation.
BACKGROUND OF THE INVENTION
Anchor type fasteners for attaching, mounting, or securing various objects or devices to masonry structures are of course well known in the art. Prior art fasteners of the aforenoted type usually, for example, comprised one of two types, that is, anchors having expansion structure incorporated therein for expansibly engaging the interior peripheral sidewall of a bore pre-drilled into the masonry structure, or anchors utilizing bonding materials for adhesively bonding to the interior peripheral sidewall of the pre-drilled bore. While both of these types of anchors have of course been operationally satisfactory from the viewpoint of being able to mount, attach, or secure various objects or devices to the masonry structure once such fasteners have themselves been mounted or secured within the bores pre-drilled within the masonry structure, both of such types of anchors are somewhat difficult and time-consuming to install, as well as to remove from the masonry structure if so desired.
In order to overcome the aforenoted operational drawbacks, disadvantages, and deficiencies characteristic of such known PRIOR ART masonry anchors, an improved, one-piece masonry anchor of the type disclosed within U.S. Pat. No. 3,937,119, which issued to Ernst on Feb. 10, 1976, was developed. More particularly, as disclosed within the noted patent, such PRIOR ART anchor, as illustrated in
FIGS. 1 and 2
of the present patent application drawings, which respectively correspond to
FIGS. 5 and 3
of the noted patent, comprises an anchor
10
having a head portion
12
, an elongated shank portion
16
, and a pointed tip or extremity
18
. A tapered helical thread
20
is provided upon the elongated shank portion
16
, and a constant diameter helical protuberance or secondary thread
22
is also provided upon the elongated shank portion
16
such that the convolutions of the protuberance or secondary thread
22
are interposed between the convolutions of the helical thread
20
, both sets of threads having the same pitch with root portions
24
defined between adjacent convolutions. The helical protuberance or secondary thread
22
is provided so as to radially center the anchor
10
within a bore
30
pre-drilled within masonry structure
28
. When the anchor
10
is secured within the bore
30
, it serves to attach or mount a workpiece or the like
32
upon the masonry structure
28
.
As shown in connection with the embodiment of
FIG. 1
, which corresponds to
FIG. 5
of the noted patent, a reaming or sizing section
40
may be provided upon the anchor
10
so as to accurately prepare or size the diameter of the bore
30
so as to effectively conform with the diametrical dimension of the centering or guide means as defined by the protuberance or secondary thread
22
. A unique feature of this anchor also comprises the provision of notched regions
26
within the primary helical thread
20
of the anchor
10
so as to permit dust or aggregate particles gradually removed from the sidewall portions of the masonry structure
28
to migrate and accumulate within reservoirs
34
, defined between adjacent convolutions of the primary and secondary threads
20
,
22
, in order to effectively reduce torsional friction whereby the anchor device can be inserted into the masonry structure at relatively low torque levels. It is noted, however, that the reaming or sizing section
40
is not provided with any migratory or reservoir structure. It has therefore been experienced that when utilizing a reaming or sizing section or member upon a masonry anchor, of a type similar to that disclosed within U.S. Pat. No. 3,937,119, such dust or aggregate particles dislodged from the sidewall portions of the masonry structure during such reaming or sizing operation cannot, or are not able to, migrate to a suitable reservoir because they are in effect trapped within the plurality of spaces defined between adjacent ones of the axially extending or longitudinal splines defined upon the reaming or sizing section
40
, as well as between the plurality of splines and the sidewall of the masonry bore
30
. Accordingly, a considerable amount of torsional friction is developed during the insertion of such anchor into the masonry structure which results in the facts that the anchors can only be inserted into the masonry structure with relatively high torque levels, that the anchors sometimes cannot be fully inserted at all, or that the required application torque is so high that the fastener head becomes separated from the fastener shank.
A need therefore exists in the art for the development of a self-tapping masonry anchor, which may also utilize a reaming or sizing member or section, wherein dust or aggregate particles generated during the self-tapping, reaming, or sizing operations are accommodated so as to effectively reduce the torsional friction whereby the anchor device can be easily inserted into the masonry structure at relatively low torque levels.
OBJECTS OF THE INVENTION
Accordingly, it is an object of the present invention to provide a new and improved masonry anchor.
Another object of the present invention is to provide a new and improved masonry anchor which effectively overcomes the various operational disadvantages, drawbacks, or deficiencies characteristic of the PRIOR ART masonry anchors.
An additional object of the present invention is to provide a new and improved masonry anchor of the self-tapping type which may also be provided with a reaming or sizing section, and which permits the migration of dust or aggregate particles generated during the self-tapping, reaming, or sizing operations and the accommodation of the same within reservoir structure such that the torsional friction generated during the self-tapping, reaming, or sizing operations is effectively reduced.
A further object of the present invention is to provide a new and improved masonry anchor of the self-tapping type which may also be provided with a reaming or sizing section, and which permits the migration of dust or aggregate particles generated during the self-tapping, reaming, or sizing operations and the accommodation of the same within reservoir structure such that the masonry anchor can be rapidly installed, within a bore pre-drilled within the masonry structure, in accordance with substantially reduced or relatively low torque levels.
SUMMARY OF THE INVENTION
The foregoing and other objectives are achieved in accordance with the teachings and principles of the present invention through the provision of a new and improved masonry anchor which comprises a headed shank having a first set of large diameter threads formed thereon, and a second set of smaller diameter threads formed thereon, wherein the two sets of threads have the same pitch with, for example, adjacent ones of the smaller diameter threads being interposed between adjacents ones of the large diameter threads. In accordance with unique structure characteristic of the present invention, wherein the masonry anchor includes a reamer section, the end portion of the anchor is provided with a reaming tip which has a substantially rectangular configuration, when viewed from an endwise vantage point, wherein the small ends or sides have an arcuate or segmental configuration corresponding substantially to the circular dimensions or configuration of the anchor shank while the large sides are linear or planar and are disposed parallel to each other. Cutting edges are thus formed at the intersections or co

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