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Патент USA US3092040

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June 4, 1963
H. E. Movn-TIE
3,091,990
HoLLow TUBULAR SPIRALLY woUNn COVERED METALLIC ANCHOR
Filed March 24. 1960
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Patented June 4, 1963
2
custom-ary opening `12 is drilled or otherwise formed in
member 14 prior to application of the anchor.
Anchor 10 is «clearly shown in FIGURES 4 and 6. It
is made of a group 16 of spirally wound wires providing a
ì.tubular core. The wires are metal, Iand it has been found
3,091,990
HOLLOW TUBULAR SPRALLY WOUND COVERED
METALLIC ANCHOR
Harland E. McVittie, Chicago, Ill.
(RG. Box 986, Maitland, Fia.)
Filed Mar. 24, 1960, Ser. No. 17,326
4 Claims. (Cl. 85-2.8)
that aluminum wires or wires of an aluminum alloy are
ideally suited for anchor 10. The envelope conñgura
tion of the group «of wires is approximately cylindrical
This invention relates to anchors and more particu
larly to expansion type anchors which may be used in a
and therefore cover or pocket 18 is also cylindrical. The
wide variety of building materials.
cover encases the wires and is made of a flexible, resilient
There are numerous anchors which are commercially
available at the present time. Many anchors are Iof the
expansion type, `and they are sold under various trade
or wall 20 is adhered to or formed integral with one end
of cover 18, and it has a central aperture 22 therein. The
opposite end of the cover 118 is open.
marks and trade names.
substance, for example plastic or rubber. An end cap
15
An object of the invention is to provide structural and
functional improvements in the expansion type of anchor.
Another object .of the invention is to provide an expan
sion anchor which may be produced at an exceedingly low
unit cost. This has the realistic advantage of making 20
available anchors at a low unit cost so that they may be
used in places where there is a temptation to use impro
Face plate '24 »is connected to the otherwise open end
of cover y18, for example by being cemented to the cover
or welded or otherwise joined to one or more of the wires
in the group of spirally wound wires .16. 4By attaching
to only `one wire of the group, the others are free to spread
in the manner `described subsequently. There is an en
larged -central opening 26 in face plate .24, and a plurality
of prongs 28 are struck from the face plate to grip into
vised anchors such as ywooden plugs or in some cases, no
the material of member Y14. Light hammer blows are all
anchors at all.
that is necessary to engage the prongs 28 in the member
A still further object of the invention -is to provide an 25 14, depending, of course, on the nature of the Substance
expansion type anchor which may be made available in
of member .14. If plasterboard or plaster are the ma
a variety of sizes to suit widely divergent needs. For
terials of construction of member 14, the prongs 2S are
example, the anchors may be made very small such as
inserted by light hammer blows. On the other hand if
would be required for hanging curtain rod brackets on a
member 14 is concrete, either the prongs 28 may bev
plaster or plasterboard wall. The various gradations of 30 omitted or the entire «face plate 24 omitted.
sizes may be increased to the extent that heavy industrial
There are two tubular expansion members .or cones -30
equipment may be anchored with the aid of large size
and 32 in the bore 36 delined by the spirally wound group
anchors in accordance with the invention. Yet, the same
of wires. -Cone 32 is rheld captive in the bore by means of
principles of the invention are preserved throughout the
wall 2-0, and it has a smooth outer surface 38 and an in
size range of anchors.
35 ternally threaded bore 40 along the central axis thereof.,
Briefly, an anchor in accordance with the invention is
The embodiment of FIGURE 7 differs from the modiñca
made of a group of spirally wound wires covered with a
resilient substance such as a resilient plastic or rubber.
' tion of FIGURE 4 by having cone 32a made sectional to
facilitate spreading of the wires y16. Cone 30 has a
This is the main body of the anchor. To make the main
smooth bore or passage 44 coaxial with bore 36 and
body functional, means may be supplied at both ends of 40 threaded bore 40. The outer surface 48 has serrations 50
the spirally wound group of wires to spread the wires
thereon to enhance »the gripping action between the outer
both from the front and rear ends thereot` so that an
surface and the side wall of bore 36. The serrations 50
exceedingly firm anchorage is obtained, after which a
may assume a number of configurations, one of which is
screw or bolt may be threaded into and removed from the
shown in FIGURES 2 and 3 and consists of a coarse screw
anchor any number of times while the anchor remains
`thread. Although cone 32. is held captive in bore 35,
.cone 30 is merely set into bore 36 (FIGURES 1 and 2)
and is adapted to be t-apped into the bore by light ham
firmly in place in an opening .of the wall, floor, etc. within
which the anchor is fastened.
These together with other objects and advantages which
will become subsequently apparent reside in the details of
mer blows to cause a spreading of one end of the anchor.
The spreading of the opposite end of the anchor is
construction and operation as more fully hereinafter de
50 achieved by propulsion of the cone 32 inwardly of the
scribed and claimed, reference being had to the accom
anchor.
panying drawings forming a part hereof, wherein like nu
A bolt or screw 54 constitutes a part fof the anchor. It
merals refer to like parts throughout, and in which:
is threaded into the threaded bore 40‘, after passing
FIGURE 1 is a perspective view of an anchor exempli
through the smooth bore 44 and passing comparatively
fying the invention.
55
freely through the intermediate part of bore 36». Opening
FIGURE 2 is a sectional view showing the anchor
22 is to allow the innermost end of the screw or bolt to
when it is first placed in an opening.
pass therethrough.
‘FIGURE 3 is a sectional view similar to FIGURE 2
Installation of -the anchor 10 is accomplished in this
but showing the anchor after it has been partially in
way: it is assumed that aperture 12 is drilled or otherwise
stalled.
formed in member 14. The anchor is inserted in the
FIGURE 4 is an enlarged sectional view of the anchor 60 opening 12, and the face plate, when used, is also anchored
when it is partially fastened in place.
to member 12 by tapping the face plate in a direction to
FIGURE 5 is a sectional view showing the anchor
insert prongs 28 into member 14 (FIGURE 2). Then
fully installed.
spreader 30 is tapped inwardly of bore 36 by hammer
FIGURE 6 is a sectional view taken on the line 6_6 of
65 blows of sutlicient force. When the larger diameter end
FIGURE 3.
of the spreader 30 is flush with the outer surface of face
FIGURE 7 is a sectional view showing a modification.
plate 24, one end of the spreader will have expanded
In the accompanying drawings there is an illustration
(FIGURE 3) spreading the strands or wires of group
of an anchor 10 which exemplifies the invention. FIG
16, and the resilient cover 18.
URES 2-5 disclose an opening -12 in a support or mem
Then the screw 54 is inserted and threaded through the
ber 14 that diagrammatically represents any material 70 threaded bore 40 of spreader 3‘2. By tightening the screw
with which an expansion type anchor may be used. As is
(FIGURE 5) the spreaders 30 and 32 will be drawn
acores@
3
deeper into bore 36, causing a further spreading action at
the opposite end of the anchor. Consequently, the anchor,
when installed, is spread at both ends as shown in FIG
URE 5, and the screw 54 may be removed with the
anchor tirmly heid in place. After removal of the screw,
any article to be fastened in place may be applied and
the screw returned with the threads of the screw engaging
threaded bore 40.
The foregoing is considered as illustrative only of the
principles of the invention. Further, since numerous
modifications and changes will readily occur to those
4
at its ends and including a plurality of spirally wound
resilient metallic Wires, a tubular jacket of resilient ma
terial and open at its ends enclosing the core, an end
plate on the core amxed to one of the wires and free of
the other wires, said end plate abutting one end of the
core and the jacket, ltubular conical expansion members
in the end portions of the core, one of said expansion
members being segmental and internally threaded, the
other of said expansion members being externally threaded
and having a smooth bore, a retaining cap on the other
end of the jacket for said one expansion member, said
end plate having an opening therein aligned with the core
skilled in the art, it is not desired to limit the invention
for
the insertion of said other expansion member, and a
to the exact construction and operation shown and de
bolt rotatably mounted in said other expansion member
scribed, and accordingly all suitable modifications and
equivalents may be resorted to, falling within the scope 15 and threaded through said one expansion member for
drawing the members toward each other for expanding
of the invention as claimed.
the core and the jacket.
What is claimed as new is as follows:
3. An expansible anchor in accordance with claim 2,
1. In an expansible anchor, the combination of a sub
said retaining cap having an opening therein aligned with
stantially tubular core comprising a set of spirally wound
Wires, a tubular jacket of resilient material enclosing said 20 the expansion members and the core and receiving said
bolt.
core, a pair of frusto-conical expanding members posi
4. An expansion anchor in accordance with claim 3,
tioned in the respective end portions of the core and pro
said end plate being engageable with a support for anchor
vided with axial bores, the bore of one of said expand
ing the core in an opening therein, said end plate com
ing members being screw-threaded, an expanding screw
rotatably extending through the bore of the other expand 25 prising a plurality of prongs struck therefrom and adapted
to be driven into the support.
ing member and through the intermediate portion of the
core and threadedly engaging the member with the thread
References Cited in the file of this patent
ed bore, whereby when said screw is tightened said ex
UNITED STATES PATENTS
panding members may be drawn together to radially ex
pand the end portions of said core and the end portions of 30 1,120,409
Rohmer et al ___________ __ Dec. 8, 1914
said jacket enclosing the same, an end plate disposed at
1,307,418
Raeger _______________ __ June 24, 1919
one end of said core and projecting radially outwardly
2,326,453
Gelpcke _____________ _- Aug. 10, 1943
beyond the outer surface of said sleeve, one of the Wires
2,553,614
Valluzzi _____________ __ May 22, 1951
of said core being secured to said end plate, the other
Wires of the core being detached from the end plate, and 35
anchor means on the end plate for preventing rotation
thereof when said screw is tightened.
2. An expansible anchor for mounting in an opening
in a support, said anchor comprising a tubular core open
2,559,281
Croessant _____________ __ July 3, 1951
403,113
544,885
577,218
Great Britain _________ __ Dec. 14, 1933
Great Britain __________ __ May 1, 1942
‘Italy ________________ __ Mar. 27, 1958
FOREIGN PATENTS
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