Note: Descriptions are shown in the official language in which they were submitted.
1100794
1 The present invention relates to an arrangement for
anchoring a mounting element in a hole of a masonry or other struc-
tures and, more ~articularly, to anchoring a mounting element with
the use of a hardenable binding material.
The prior art has encountered very serious difficulties
when it is desired to mount an object by means of a mounting element
anchoring on a low-strength support structure which are typically
porous and usually have large vacant cavity areas. In such porous
supporting structures having internal hollow cavities separated by
partition walls, it has heen proposed to utilize an extra-long dowel
whose length is selected so that they can engage and grip several
of the partition walls in the interior of the sup~ort structure.
Thus, as a result of distributing the expansion pressure force over
several partition walls, a large extraction force is required to
remove an object from the support. However, even with this prior
art approach, one still subjects the interior of the structure to
some crumbling. Moreover, the higher anchoring value frequently
necessary to mount an object on a support cannot always be achieved.
It has been also proposed particularly for anchoring
mounting elements in porous supporting structures to use hardenahle
binding material. A hole having a considerably larger cross-section
than the cross-sectional dimension of the mounting element is formed
in the masonry. Then the mounting element is inserted into the hole
and binding material is injected through an opening provided in a
flange thereof. The binding material fills a cavity formed between
the mounting element and a wall of the hole. The mounting element
anchored in the hole has a sleeve-shaped body provided with a curved
portion at a leading end thereof, and with an annular portion at a
trailing end for fixing the mounting element in the hole. T~hen the
mounting element is anchorecl in the hole of the masonry, a threaded
~k
110~794
1 element may be ~hreaded into the mounting element so as to
support a structure to he mounted to the masonry.
It has been found that the above arrangements for
anchoring mounting elements in holes of masonry are not satisfac-
tory in some respects.
Accordingly, it is an object of the present invention
to provide an arrangement for anchoring a mounting element in a
hole of a masonry or the like with the use of binding material,
such as wood screws, on the one hand, and can be manufactured simply
and inexpensively with sufficient holding strength.
In keeping with these objects, and with others which
will become apparent hereinafter, one feature of the present in-
vention resides, briefly stated, in a sleeve-shaped mounting ele-
ment provided with a plurality of retaining members which extend
transversely to an axis of the mounting element and fix the latter
in a hole of a masonry, which retaining members have through-going
apertures and tapers towards a wall of the hole.
In order to anchor the above mounting element a hole
is drilled in the masonry, which hole has a diameter corresponding
to an outer diameter of the retaining members of the mounting ele-
ment so that when the mounting element is inserted in the hole, it
is fixed in the hole by the retaining members.
Preferably, the retaining members are formed on an
outer surface of the mounting element, they are flange-like and
spaced from one another in an axial direction, and they are of one
piece with the mounting element.
Means for closing the hole is also provided,including
a flange member arranged at a trailing end of the mounting element
as considered in the direction of insertion of the latter into the
hole. The flange member has a through-going opening for feeding
1~0()794
1 binding material into the hole of the masonry. The flange member
serves simultaneously for closing the hole so as to prevent back-
flow of the binding material therefrom, and also as a stop member
for limiting the depth of insertion of the mounting element into
the hole. A ventilating opening may be provided in the flange for
additionally ventilating the hole, particularly for the cases
when the masonry does not have inner cavities.
The retaining members preferably taper towards the
wall of the hole so that they have a wedge-shaped configuration.
In this case, a core of the binding material is formed by a plu-
rality of segments which are connected by a section extending
through the apertures of the retaining members and have a wedge-
shaped configuration which widens towards the wall of the hole.
Such segments offer high resistance to extraction owing to intimate
connection with the wall of the hole. Since the retaining members
are reinforced in regions adjacent to the body portion of the mount-
ing element, the shearing strength of the retaining members is addi-
tionally increased, on the one hand, and the rigidity thereof
prevents the mounting element from slipping when it is subjected to
extraction force, on the other hand.
In addition, the extraction force acting in the axial
direction is changed by the wedge-shaped retaining members into a
force which acts normally to the faces of the retaining members and
therefore is directed towards the wall of the hole. The friction
of the core of the binding material against the wall of the hole
is thereby additionally increased by an expansion force which presses
the core of binding material against the wall of the hole so that a
very high holding strength is obtained.
Another feature of the present invention is that the
flange member may be formed with an extension extending in a direc-
1:10(J794
1 tion transverse to the axis of the mounting element, in whichextension the feeding opening may be at least partially formed.
Such a construction is suitable for the cases when the mounting
element has a relative small transverse dimension so that a gap
between the mounting element is not sufficient for forming a feed-
ing opening, such as when the mounting element is anchored in edge
regions. Since the feeding opening should not have a dimension
below a certain size due to the viscosity of the binding material,
the feeding opening which is at least partially formed in the above
extension of the flange member may have a required comparatively
greater dimension. The extension may be formed as a radial ex-
tension.
In this construction the feeding opening must not be
located in alignment with the gap between a boay of the mounting
element and the wall of the hole, and for this reason an outer di-
mension of the mounting element as measured over the retaining mem-
bers can closely correspond to the outer dimension of the body
thereof so that the hole may be only slightly larger than the outer
dimension of the body of the mounting element. The thus-constructed
mounting element can he anchored in edge regions, and, for example,
in the end faces of thin-walled parts. One should care in this case
that the mounting element must be so inserted in the hole that its
extension is positioned in the region where the thickness of the
material is relatively great.
Prior to introduction of the binding material into
the hole, a passage must be formed in the masonry so as to communi-
cate the feeding opening in the extension of the flange member with
the hole. Since masonry material is porous and soft, this can be
easily done by piercing thereof with a screwdriver, a nail and the
like. After this, the binding material ls injected thxough the
1~00794
1 feeding opening in the flange and through the thus-formed passage
into the hole of the masonry. Thus, such an opening is available
for feeding the binding material into the hole which is considerably
larger than the gap hetween the body of the mounting element and
the wall of the hole.
Still another feature of the present invention is that
the inner bore of the mountinq element is separated by a destructable
partition wall into two sections located adjacent to the leading end
and the trailing end of the mounting element, respectively. At
least one feeding opening is formed in the wall of the trailing end
section of the mounting element and may be located immediately behind
the flange member. In this case it is possible to use the inner bore
of the mounting element for injecting the binding material so that
the mounting element may be of a considerably small size. ~ portion
of the feeding device may be inserted into the trailing end section
of the inner bore of the mounting element, and the binding material
will be injected through the trailing end section into the feeding
opening and thereafter into the hole.
The leading end section, that is, the major section of
the inner bore is protected from entering oE the binding material by
the partition wall so that a threaded element can be subsequently
threaded thereinto. In spite oE the fact that for manufacturing
reasons the leading end of the mounting element is open, the hinding
material is prevented from penetrating into the leading end portion
of the inner bore by a cushion of air formed in the latter, at least
to the extent sufficient for threading the threaded element therein.
A tip of the threaded element which is threaded into the inner bore
of the mounting element can crush and dislodge the binding material
which is hardened between longitudinally extending ribs provided in
the inner bore. Prior to this, the partition wall which may he
ll~)V79~
1 formed as an injection-molded membrane, has to be pierced by a
screwdriver, a nail or the like.
In accordance with a further feature of the present
invention, an open leading end of the mounting element may be closed
for example by a cap, which prevents the binding material from pe-
netrating into the inner bore of the mountlng element through the
open leading end thereof.
A still further feature of the present invention is that
an additional nozzle member may be provided, having one portion in-
sertable into the inner bore of the mounting element, and anotherportion provided with an opening for insertion of a portion of the
feeding device therein. It is especially preferable when the moun-
ting element has very small dimensions and the feeding opening is
correspondingly small so that the feeding device cannot he efectively
positioned against the latter. Since the nozzle member is fixed
relative to the feeding opening, the feeding device is effectively
prevented from slipping off relative to the latter. ~he nozzle also
effectively prevents the binding material from being squeezed during
injecting into the hole. The nozzle and the wall of the inner bore
of the mounting element may he provided with interengaging projections
and recesses so as to assure that the nozzle member is aligned with
the feeding opening of the flange member of the mounting element.
An additional feature of the present invention is that
the arrangement may be provided with a sheath extending from the
flange member over a portion of the length of the mounting element.
When additional structur~ such as plaster-board panels and the like
are mounted against th~e masonry, the binding material injected into
the hole of the masonry may escape through a gap between the additional
structure and the masonry. This results not only in the loss of the
binding material but also leads to dirtying of an outer surface of
110~)794
1the masonry. T~hen the sheath is provided having a length exceed-
ing the thickness of the additional structure so that its portion
extends into the hole o~ the masonry, the above gap is bridged
by the sheath an~ therefore the binding material cannot escape
through the gap. The sheath located against the wall of the hole
prevents the back-flow of the binding material and guides the latter
when it flows in a cavity formed between the sheath and the mounting
element. The sheath can be axially fixed by firmly clamping the
same either in the bore or against the retaining members o~ the
10mounting element. The sheath may also be of one piece with the
mounting element.
The novel features which are considered as character-
istic for the invention are set forth in particular in the appended
claims. The invention itself, however, both as to its construction
and its method of operation, together with additional objects and
advantages thereof, will be hest understood from the following de-
scripticn of specific em~odiments when read in connection with the ?
accompanying drawings.
~IG. 1 is a view showing a mounting element in accor-
20dance with the present invention, inserted in a hole of a masonry
or the like and surrounded by binding material injected into the
hole;
FIG. 2 is a view showing a section of the mounting
element taken along the line II-II in FIG. l;
FIG. 3 is a view showing a mounting element inserted
in a hole, in accordance with another embodiment of the present in-
vention;
FIG. 4 is a view showing a section of the mounting
element taken along the line IV-IV of FIG. 3;
FIG. 5 is a view showing a mounting element inserted
1101J794
1 in a hole, in accordance with still another embodiment of the
present invention;
FIG. 6 is a view showing a mounting element in accor-
dance with a further embodiment of the present invention; and
FIG. 7 is a view showing a mounting element inserted
in a hole, in accordance with a still further embodiment of the
present invention.
In FIG. 1 of the drawing reference numeral 1 identifies
a masonry in which a hole ~ is formed ~y horing or a similar drilling
operation. A mounting element 4 is inserted in the hole 2 of the
masonry 1 and provided with a plurality of retaining members 3. As
can be seen from this Figure, an outer dimension of the mounting ele-
ment 3 in the direction transverse to an axis thereof, as measured
over the retaining members 3, corresponds to the respective dimension
of the hole 2. The mounting element 4 has an inner bore 9 provided
with ribs 10 and adapted to receive therein a threaded element, such
as a wood screw.
The retaining members 3 are formed as f~ ange-like mem-
hers arranged at an outer surface of the mounting element 4 and ex-
tending in a direction transverse to the axis of the latter. Theyare spaced from one another in an axial direction. ~he reiaining
members 3 have a wedge-shaped configuration and taper towards a wall
of the hole 2~ ~s mentioned above, they extent in the transverse
direction up to the wall of the hole 2. Each of the retaining members
3 has a through-going aperture 8 which may extend in the axial direc-
tion.
Means is provided for closing the hole 2 when the
mounting element 1 is inserted in the latter. This means includes a
flange-like member 5 mounted at a trailing end of the mounting element
4 as considered in the direction of insertion of the mounting element 4
110~)794
1 into the hole 2. The closing flange 5 has a throuqh-going opening
7 in which a porti.on of a feeding device 6 may he received.
The mounting element 4 may be inserted into the hole 2
of the masonry 1 for a depth limited by the flange 5 which, at the
same time, closes an inlet of the hole 2. The feeding device is
connected to the flange 5 and binding material is injected from the
latter through the opening 7 into the hole 2. The binding material
flows through the apertures 8 of the retaining members 3 and fills
the entire hole 2. In order to ventilate the hole 2, the flange 5
may he provided with a needle-shaped ventilating hole which is not
shown in this Figure. When the binding material is hardened, the
mounting element 4 will be firmly retained in the hole 2. After
this, an article may be mounted to the masonry by means of a wood
screw which may be threaded into the inner bore ~ of the mounting
element 4.
FIGS. 3 and 4 show the mounting element which prefer-
ably may be used in the case when a gap between the wall of the hole
2 and an outer face of a body portion of the mounting element 4 is
not sufficient for forming a feeding opening 7 in the flange 5. In
the above case, the flange 5 of the mounting element 4 has an ex-
tension 11 extending in a direction transverse to the axis of the
mounting element 4. This extension may be formed as a radial exten-
sion of the flange 5. The opening 7 is at least partially formed in
the above extension 11. It is to be understood that the opening 11
may be formed in the extension 11. ~ passage 12 may be provided in .-
the masonry, communicating the opening 7 in the flange 5 with the
hole 2 of the masonry 1. This passage may be made by piercing of a
respective portion of the masonry 1 by a suitable sharp object. The
flange 5 may be additionally provided with a needle-shaped ventilat-
ing opening 13. A portion of the feeding device 6 is received in
--10--
U794
1 the opening 7 formed in the extension 11 of the flange 5.
In the above described embodiments of the invention
the portion of the feeding device is inserted into the opening 7
of the flange 5, which opening is offset relative to the inner bore
9 of the mounting element 4 in a direction transverse to the axis
thereof.
FIG. 5 shows the mounting element ~ in which the
portion of the feeding device 6 may be directly inserted into the
inner bore 9 of the mounting element 4. The inner bore 9 of the
mounting element 4 is separated by a partition wall 14 into two
sections located adjacent to a trailing end and to a leading end of
the mounting element 4. The aperture 7 is formed in a wall of the
first-mentioned section of the inner bore 9. Two such apertures
may be provided, which are circumferentially spaced from one an-
other and preferably located diametrically opposite to one another.
The apertures are preferably located immediately adjacent to the
flange 5. In such construction the portion of the feeding device
6 is inserted directly into the first-mentioned section of the inner
bore and the binding material is injected through this section of
the inner bore 9 into the apertures 7 and thereafter into the hole
2 of the masonry 1.
The partition 13 prevents the binding material from
penetrating into the second section, that is into the main section
of the inner bore 9. At least during low pressure injection pro-
cesses the binding material is also prevented from penetrating into
an open leading end of the second section of the inner bore 9 by
a cushion of air formed within the second section. However, during
high pressure injection processes it is advisable to close the
leading end of the mounting element, such as by a cap 15. The
partition wall 14 may be made as an injection-molded membrane which
--11--
llOV79g
1 can be destroyed after hardening of the binding material in the
hole 2. The partition wall can be, for instance, pierced hy a
sharp object. After this, the entire inner bore 2 is unobstructed,
and an article can be mounted to the masonry 1 by means of a wood
screw which can be threaded into the inner bore 9 of the mounting
element 4.
In order to position the feeding device 6 against the^
feeding opening 7 in the case when the mounting element 4 has rela-
tively small dimensions, an additional nozzle 16 may he provided as
shown in FI~. 6. The nozzle 16 has a first pin-shaped portion 18
insertable into the inner bore 9 of the mounting element 4, and a
second portion having a funnel-shaped opening 17 which can communi-
cate with the aperture 7 in the flange 5 of the mounting element 4.
The portions are connected integrally with one another. The first
pin-shaped portion 18 of the nozzle 16 has at least one projection
20 engaging iII a complementary recess 19 on the mounting element 4.
When the nozzle 16 is connected to the mounting element 4, that is,
when the first portion 18 of the nozzle 16 is inserted into the
inner bore 9 of the mounting element 4, the portion of the feeding
device 6 is inserted into the opening 17 of the second portion of
the nozzle 16 and the binding material is injected through the
aperture 7 into the hole 2 of the masonry. In order to thread a
screw of an article to be mounted into the inner bore 9, the nozzle
16 is withdrawn therefrom.
The mounting element 4 shown in FIG. 7 is provided
with an additional sheath 21 which can be pulled over the retaining
members 3 of the mounting element 4. The sheath 21 has an outer
diameter corresponding to the diameter of the hole 2 in the masonry
1. In order to insert the mounting element 4 into the hole 2, the
sheath 21 is pulled over the retaining members 3 of the mounting
94
1 element and the thus-assembled structure is inserted into the
hole 2, until the flange 5 abuts against the masonry 1 and closes
the hole 2. In this position the sheath 21 extends lnto the hole 2
and bridges a gap which is formed between the masonry 1 and an ad-
ditional structure 22 mounted thereto. The feeding opening 7 is
so arranged in the flange 5 that it communicates with a cavity
formed between an outer surface of a body portion of the mounting
element 4 and an inner surface of the sheath 21.
It will be understood that each of the elements de-
scribed above, or two or more together, may also find a usefulapplication in other types of constructions differing from the types
described above.
While the invention has been illustrated and described
as embodied in an arrangement for anchoring a mounting element in
a hole of a masonry or the like, it is not intended to be limited to
the details shown, since various modifications and structural changes
may be made without departing in any way from the spirit of the
present invention.
