U.S. patent number 3,566,739 [Application Number 04/797,408] was granted by the patent office on 1971-03-02 for anchoring device.
Invention is credited to Charles S. Lebar.
United States Patent |
3,566,739 |
Lebar |
March 2, 1971 |
ANCHORING DEVICE
Abstract
An improved anchor is provided by a single piece that is
preshaped to define both an expander and sleeve positioned in
endwise relation to each other and interconnected through a
connection that is shearable upon bottoming the sleeve on the
bottom wall of an aperture and then sharply striking the distal end
of the expander to shear said connection and simultaneously
telescope the expander into the sleeve. The portion of the sleeve
adjacent the shearable connection may be thinned for easier rupture
and a portion of the sleeve may be slotted for ease in
expansion.
Inventors: |
Lebar; Charles S. (Barrington
Hills, IL) |
Family
ID: |
25170755 |
Appl.
No.: |
04/797,408 |
Filed: |
February 7, 1969 |
Current U.S.
Class: |
411/41 |
Current CPC
Class: |
F16B
13/0858 (20130101) |
Current International
Class: |
F16B
13/04 (20060101); F16B 13/08 (20060101); F16b
013/06 () |
Field of
Search: |
;85/73,74,72 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Allen; Edward C.
Claims
I claim:
1. In an elongated anchor device of the type including an expander
portion, having a circumferentially continuous and uninterrupted
frustoconical exterior for telescoping into an end of a sleeve and
secured at its reduced end by a shearable connection to an
expandable sleeve member; the improvement comprising the said
sleeve member having an inner cylindrical surface and being shaped
exteriorly to provide a cylindrical section spaced from the said
reduced end of the expander by an intervening frustoconical,
thinned, section, said frustoconical, thinned section having a
circumferentially continuous and uninterrupted inner cylindrical
periphery and a circumferentially continuous and uninterrupted
frustoconical outer periphery, and said cylindrical section of the
sleeve being slotted along its length through the thickness of the
sleeve wall to provide for ease of expansion of said cylindrical
portion of the sleeve member.
2. In an elongated anchor device of the type including an expander
portion, having a circumferentially continuous and uninterrupted
frustoconical exterior for telescoping into an end of a sleeve and
secured at its reduced end by a shearable connection to an
expandable sleeve member; the improvement comprising the said
sleeve member having an inner cylindrical surface and being shaped
exteriorly to provide a cylindrical section spaced from the said
reduced end of the expander by an intervening frustoconical,
thinned, section, said frustoconical, thinned section having a
circumferentially continuous and uninterrupted inner cylindrical
periphery and a circumferentially continuous and uninterrupted
frustoconical outer periphery, and said cylindrical section of the
sleeve being slotted along its length through the thickness of the
sleeve wall to provide for ease of expansion of said cylindrical
portion of the sleeve member, and the frustoconical exterior of the
expander portion providing two bands of circumferentially
continuous and uninterrupted surface spaced apart by a
circumferentially continuous band of knurling that is adapted for
increased gripping engagement with the inner surface of the sleeve
member, when the expander portion is telescoped into the sleeve, to
prevent relative rotation between the expander and the sleeve.
Description
BACKGROUND OF THE INVENTION
This invention relates to an improved anchor for blind holes.
An object of this invention is to provide in a single piece, and as
a convenience for storage and use, both the expander and sleeve
parts of an expander type anchor, and to interconnect those parts
through a shearable connection, so that upon positioning of the
device in a bottomed blind hold and by striking the exposed end of
the device, the two portions of the device telescope with the
expander positioned in the sleeve.
Another object of this invention is to provide an improved anchor,
and more particularly an improved sleeve for an anchor, for use in
blind holes.
A further object is to provide an improved anchor for blind holes
that is characterized by inexpensiveness and simplicity of
construction and by improved convenience in use.
Further objects and advantages of this invention will become
apparent as the following description proceeds and the features of
novelty which characterize this invention will be pointed out with
particularity in the claims annexed to and forming part of this
specification.
A preferred embodiment of the invention is shown in the
accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side elevation view of an anchor device embodying the
invention;
FIG. 2 is a longitudinal cross section of the device of FIG. 1;
FIG. 3 is a fragmentary longitudinal cross section view of a blind
hole in concrete showing the environment where the invention is to
be used;
FIG. 4 is similar to FIG. 3 but shows a modified from of the device
of FIG. 1 positioned in the blind hole;
FIG. 5 illustrates in cross section how the sections of the device
of FIG. 1 are telescoped after first being positioned as
illustrated in FIG. 4; and
FIG. 6 illustrates the anchor of FIG. 1 when its sleeve is fully
expanded in the environment seen in FIGS. 3--5.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawing, one form of the invention herein is
shown in FIGS. 1 and 2 as a combination device illustrated
generally at 10 and consisting of an elongated expander 12 and an
elongated sleeve 14 spaced longitudinally of each other at an
axially aligned attitude. As best seen in FIG. 2, the expander 12
is annular and has a frustoconical exterior 12a that tapers along
the length of expander 12 from a reduced entry tip 12b to an
enlarged end 12c located at one terminus of the device 10. The bore
of expander 12 is threaded at 12d to provide for the customary
connection thereto. The sleeve 14 has one end 14a at one terminus
of the device 10, a second end 14b intermediate the ends of device
10, and a cylindrical bore 14c longitudinally therethrough. The
bore 14c has a diameter that is intermediate in size between the
diameter dimensions of ends 12a and 12b of the expander.
FIGS. 3 and 4 illustrate generally the environment in which a
combination device 10 of the type in FIGS. 1 and 2 is to be used.
There is shown a concrete body C with a blind hole 16 therein. FIG.
4 shows that the length and diameter of blind hole 16 are each
slightly greater than the corresponding dimensions of the sleeve
14, so that when the connector device of FIGS. 1 and 2 is inserted
in the blind hole 16 of FIG. 3, the parts will be generally in the
position as seen in FIG. 4, with the end 12c of the expander 12 in
contact with the innermost end of the hole 16 and with a portion of
sleeve 14 entering the outer end of hole 16, but with the greater
portion of sleeve 14 located generally outwardly of body C.
The expander 12 and the sleeve 14 are formed integrally as seen in
FIGS. 1 and are maintained in that condition, for convenience in
storage and for sale, by means of a shearable connection 20 at the
juxtaposed ends of the two sections. The shearable connection 20 is
a thin annular wall that is formed integrally with and extends
between the tip 12b of the expander and the end 14b of the sleeve,
i.e., radially outwardly of tip 12b and radially inwardly of end
14b with the wedging end of the expander immediately adjacent one
end of the sleeve so that the small diameter end 12b of the
expander is positioned immediately adjacent the larger diameter
bore 14c of the sleeve.
The shearable connection is a very thin piece of metal such that
when the combination device 10 is positioned as in FIG. 4, then by
simply striking end 14a of the sleeve sharply with a hammer, as
illustrated in FIG. 5, the connection 20 readily shears to permit
telescoping entry of the wedging tip 12b of the expander into the
sleeve 14. Further driving action by the hammer moves the sleeve 14
into the hole 16 causing the sleeve 14 to move over the expander
12, while simultaneously expanding the sleeve 14 outwardly into
tightly gripping engagement with the interior cylindrical periphery
of the bore 16.
To facilitate the ready expansion of the sleeve 14 into gripping
engagement, the portion of the sleeve immediately adjacent the
shearable connection 20 is formed with a frustoconical exterior
portion 14d, thereby thinning the annular wall of the sleeve
adjacent the end 14b. As the expander 12 moves relatively further
into the sleeve 14, the thinned wall portion, adjacent said end of
the sleeve, stretches and even ruptures as indicated at 24. The
telescoping movement of sleeve 14 relative to expander 12 continues
until the end 14a of the sleeve is located at a position
substantially coplanar with surface of the body C, as seen for
example in FIG. 6.
In a modified form of device as shown in FIG. 4, the cylindrical
portion of the sleeve 14', from whence the thinned or tapered
portion 22' extends and which is distal from the expander 12, is
provided with a longitudinal slot 26 therein completely through the
wall so that as further telescoping occurs between sleeve 14 and
expander 12, the said cylindrical portion 14' is more easily
expanded into gripping engagement with the cylindrical wall of the
bore 16.
In both forms of device, as in FIGS. 1 and 2 and in FIG. 4, the
expander 12, sleeve 14 and shearable connection 20 are formed
integrally of any appropriate material such as selected steels that
permits all of the actions demanded. The arrangement of parts
insures that there is always one sleeve for each expander and
telescoping is insured by the axial alignment of the parts.
It will be understood that a device such as at 10 in FIGS. 1 and 2
may be readily produced by automatic machines and that, too, is a
desirable feature. Where a slot is to be added as at 26 in the form
of device of FIG. 4, the device is first formed on automatic
machines without the slot, and the devices may then be fed
automatically by hopper so as to be aligned and slotted. As an
additional feature, a portion of the frustoconical wall 12a of
either form of device may be provided with a knurl as indicated in
the position of 28 in FIG. 4 which will engage the inner
cylindrical wall 14c of the sleeve for preventing relative rotation
of the expander 12 when a bolt is being rotated in the threads 12d
of the expander.
It will be obvious to those skilled in the art that other changes
and modifications may be made in the invention without departing
therefrom and, therefore, it is intended in the appended claims to
cover all such changes and modifications as fall within the true
spirit and scope of the invention.
* * * * *