Arrangement for and a method of anchoring a mounting element in a hole of masonry and the like

A device comprises a sleeve-shaped mounting element receivable in a hole of a structure which has a transverse dimension less than the transverse direction of the hole so as to form a circumferential recess between the mounting element and the hole. The mounting element has a central bore and a transverse bore communicating the central bore with the circumferential recess. An adapter element is inserted in the central bore of the mounting element and has a further bore adapted to communicate with a source of a hardenable binding material and the transverse bore of the mounting element so as to establish a path for passage of the binding material from the source into the circumferential recess to be hardened in the latter and to thereby anchor the mounting element in the hole of the structure. Various means are provided for holding the mounting element in a predetermined position relative to the hole, for preventing backflow of the binding material out of the hole, for establishing the path for passage of the bonding material and for interrupting this path for indicating a position in which the path is established, for preventing axial displacement of the mounting element relative to the hole after anchoring therein by the binding material.

BACKGROUND OF THE INVENTION 
The present invention relates to an arrangement for and a method of 
anchoring of a mounting element in a hole of masonry or other structure 
and, more particularly to anchoring a mounting element with 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 
interior hollow cavities separated by partition walls, it has been 
proposed to utilize an extra-long dowels whose length is selected so that 
it can engage and grip several of the partition walls in the interior of 
the support 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 further proposed particularly for anchoring mounting elements 
in porous supporting structures to use adhesives to improve the holding 
strength or retention of mounting elements. However, the adhesive 
technique cannot be effectively used for block-type walls having interior 
cavities, and in the porous structures the retention properties of the 
dowel are essentially limited by lowbreaking strength of the masonry 
material. 
It is also known in the prior art to mortar dowels into a hole provided in 
a masonry, which hole has a cross-section considerably larger than the 
cross-sectional measurement of the dowel. The hole is filled with a cement 
mixture and then the dowel is inserted into said mixture. Such method 
possesses the disadvantage that it is acceptable only for anchoring the 
dowels in a floor, when a binding material does not flow out of the hole. 
Another disadvantage of this method consists in that the dowel inserted in 
the hole which hole is filled with the binding material sinks into the 
binding material, displaces from a required position relative to the hole 
and is fixed in an incorrect position. In order to ensure that the dowels 
are correctly positioned in the hole, it is necessary to support and to 
hold the dowel therein until the mixture sets which is evidently 
time-consuming. 
For all of the above considerations, the only time that dowels are 
generally cemented into walls is in mass-production of pre-fabricated 
concrete parts. In this mode of production, the dowels are positioned in 
place by means of pins which are pre-arranged on slabs. The pins are 
positioned into the respective inner passages of the dowels and thereby 
hold the dowels in place until the cement has hardened. This apporach, as 
the others described above, has the disadvantage of requiring additional 
holding elements. 
SUMMARY OF THE INVENTION 
Accordingly, it is a general object of the present invention to overcome 
the disadvantages of the prior art. 
More particularly, it is an object of the present invention to provide an 
arrangement for and a method of fixedly anchoring a mounting element in a 
hole of a masonry or other structure. 
An additional object of the present invention is to provide an arrangement 
for and a method of anchoring a mounting element which does not require 
the mounting element to be held in place after insertion of the same into 
the hole. 
Still another object of the present invention is to provide an arrangement 
for and a method of anchoring a mounting element which is utilizable for 
sealing the anchoring hole of a masonry or other structure against outflow 
of a binding material. 
Yet another object of the present invention is to provide an anchoring 
arrangement which is simple in operation and economical to manufacture. 
In keeping with these objects and others which will become apparent 
hereinafter, one feature of the present invention, resides in an 
arrangement for anchoring a mounting element in a hole of a masonry or 
other structure by the use of a binding material which, briefly stated, 
comprises a sleeve-shaped mounting element having a cross-sectional 
dimension less than the cross-section of the hole so as to form a 
circumferential recess between an outer surface of the mounting element 
and the hole, the mounting element has a central bore adapted to receive 
therein a threaded element and is provided with at least one substantially 
transverse bore communicating the central bore with the circumferential 
recess; ribs provided on a trailing end portion of the mounting element 
and projecting therefrom for holding the mounting element in a 
predetermined position relative to the hole, the ribs extend in an axial 
direction of the mounting element and are circumferentially spaced from 
one another, the ribs are bevelled towards a leading end of the mounting 
element and are circumferentially spaced from one another, the ribs are 
bevelled towards a leading end of the mounting element and have a maximum 
transverse dimension exceeding the cross-section of the hole; flange 
member provided on the trailing end portion of the mounting element and 
transversely projecting from the latter, the flange member has a 
transverse dimension exceeding the cross-section of the hole so as to 
prevent backflow of the binding material out of the hole; and adapter 
element insertable in the central hole of the mounting element of the 
binding material and the transverse bore of the mounting element so as to 
establish a path for passage therethrough of the binding material from the 
source into the circumferential recess to thereby anchor the mounting 
element in the hole. 
The mounting element is inserted in the hole of the masonry so as to form 
the circumferential recess between the outer surface of the mounting 
element and the hole and is firmly held in a predetermined position by 
means of the ribs penetrating into the masonry. At the same time the hole 
is reliably closed by the flange member which prevents backflow of the 
binding material. The adapter element is inserted into the central bore of 
the mounting element and the blind hole of the former communicates with 
the transverse bore of the latter so as to establish the composite path. 
The binding material is fed into the blind hole of the adapter element, 
travels through the same and through the transverse bore of the mounting 
element, fills the circumferential recess between the outer surface of the 
mounting element and the hole, and anchors the mounting element in the 
hole. 
The use of the ribs holding the mounting element in a predetermined 
position relative to the hole, and of the flange preventing backflow of 
the binding material out of the hole permits to anchor the mounting 
elements not only in a floor, but also on walls and even on a ceiling and, 
at the same time does not require holding of the mounting element until 
the binding material has hardened. 
Another feature of the present invention is that after filling the 
circumferential recess with the binding material, the adapter element is 
moved to a position in which the blind bore does not communicate with the 
transverse bore of the mounting element and prevents backflow of the 
binding material through the transverse bore and the blind hole. After 
hardening of the binding material in the circumferential recess the 
adapter element is extracted from the central bore of the mounting element 
and a threaded element is inserted into the thus emptied central bore of 
the mounting element. 
Still another feature of the present invention is that the central bore of 
the mounting element is provided with elongation projections extending in 
an axial direction of said central bore. In this case, the threaded 
element during screwing thereof into the central bore of the thus 
constructed mounting element encounters lesser resistance of plastic 
material of the mounting element, and thereby the screwing of the threaded 
element into the mounting element is essentially facilitated. 
An additional feature of the present invention is to provide means for 
indicating when the blind bore of the adapter element communicates with a 
central bore of the mounting element, which means may be formed as two 
indicia, one of which indicia is provided on a trailing end section of the 
adapter element and the other indicia is provided on the flange member of 
the mounting element. These indicia may be made as two indentations 
located in the respective parts of the arrangement. The one of these 
indicia is alignable with the other indicia when the blind hole of the 
adapter element communicates with the transverse bore of the mounting 
element. Additional indicating means may be provided for indicating a 
position of the adapter element when the latter is withdrawn after filling 
the binding material into the circumferential recess and the blind bore of 
the adapter element does not communicate with the central bore of the 
mounting element. 
Still additional feature of the present invention is that means are 
provided for fixing the adapter element in the position when the blind 
hole communicates with the transverse bore of the mounting element, which 
means may be formed, for instance, as interengaging key and key groove. 
This prevents undesirable rotation of the adapter element and the mounting 
element relative to one another. 
Yet another feature of the present invention consists in that the adapter 
element has a leading section, which leading section is of a dimension in 
an axial direction at least equal to the respective dimension of the 
transverse bore of the mounting element. After injecting binding material 
into the circumferential recess the adapter element is slightly displaced 
in a direction opposite to the direction of insertion of the same so that 
the thus constructed leading end section becomes positioned across the 
transverse bore of the mounting element and closes this bore thereby 
preventing backflow of the binding material out of the circumferential 
recess. 
Finally, still one further object of the present invention is embodied in 
providing transverse ribs on the outer surface of the mounting element, 
which transverse ribs are spaced from one another in the axial direction. 
After hardening of the binding material and anchoring the mounting element 
in the hole the transverse ribs prevent axial displacement of the mounting 
element relative to the hole. With these ribs extraction values for the 
mounting element after the binding material has hardened is vastly 
superior to the withdrawal values of the prior art mounting elements used 
until now. The problem of slippage of the mounting element of the prior 
art has been eliminated. 
The novel features which are considered as characteristic 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 best understood 
from the following description of specific embodiments when read in 
connection with the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring jointly to the arrangement for and the method of anchoring a 
mounting element in a hole of a masonry or other structure, it will be 
seen that reference numeral 1 identifies a masonry in which a hole 2 is 
provided by boring or a similar drilling operation. A mounting element 4 
is insertable into the hole 2 and has a cross-sectional dimension lesser 
than the cross-section of hole 2 so that a circumferential recess is 
formed between an outer surface of the mounting element 4 and the hole 2. 
The mounting element 4 has a central bore 9 extending in an axial direction 
of the mounting element 4 from its leading end portion to its trailing end 
portion, which central bore 9 is adapted to receive therein a threaded 
element, such as, for instance, a screw for mounting an object such as a 
panel. An inner surface of the mounting element 4 is formed with 
projections 16 extending in the axial direction and facilitating screwing 
of the threaded element into a central bore of the mounting element 4. The 
central bore 9 communicates with a circumferential recess between the 
outer surface of the mounting element 4 and the holes by means of a 
transverse bore 12. It is understood that several transverse bores may be 
provided for communication of the central bore with the circumferential 
recess. A flange 5 is connected to the trailing end portion of the 
mounting element 4 and projects transversely from the same at a distance 
exceeding the cross-section of the hole 2. The flange 5 serves for 
covering the hole 2 and sealing the same against outflow of any of the 
binding material in the fluid state. At the same time it acts as an 
abutment surface for the mounting element 4. A needle hole 19 is made in 
the flange 5 for ventilating the hole 2 during injecting the bonding 
material into the latter. 
Ribs 3 are provided on the trailing end portion of the mounting element, 
which ribs 3 project from the outer surface of the same. The ribs 3 extend 
in the axial direction and are circumferentially spaced from one another. 
They are bevelled from the trailing end portion towards the leading end 
portion of the mounting element 4 and have a maximum transverse dimension 
exceeding the cross-section of the hole 2. The ribs 3 serve for holding 
the monting element in a predetermined position relative to the hole 2. 
Transverse ribs 17 are further provided on the outer surface of the 
mounting element 4, which transverse ribs 17 are spaced from one another 
in the axial direction. They prevent the axial displacement of the 
mounting element 4 relative to the hole 2 after anchoring the mounting 
element 4 by the hardened binding material. Each of the transverse ribs 17 
has longitudinal slots 18 circumferentially spaced from each other and 
adapted to permit passage of the binding material through the same when 
the binding material is being fed into the hole 2. 
An adapter element 10 is insertable into the central bore 9 of the mounting 
element 4 and has a blind hole consisting of a central hole and a 
transverse hole 11, which transverse hole 11 communicates with the central 
hole and is open at an outer surface of the adapter element 10. A leading 
end section of the adapter element 10 is of a length in the axial 
direction at least equal to the respective dimension of the transverse 
bore 12 of the mounting element 4 so that the leading end section 15 can 
close the transverse bore 12 while being positioned across the latter. The 
central hole has an inlet funnel-shaped part 8 adapted to receive therein 
an outlet portion of a device 7 for injecting the hardenable binding 
material. Interengaging key 13 and key groove 14 are provided in the 
mounting element 4 and the adapter element 10, respectively, for fixing 
the latter in a position in which the transverse hole 11 of the adapter 
element 10 is in alignment with the transverse bore 12 of the mounting 
element 4. 
An arrangement of the present invention may also comprise means for 
indicating the above mentioned alignment of the transverse hole 11 with 
the transverse bore 12. As shown in FIG. 3, such means may include at 
least two indicia, 20 and 21 one of which indicia 21 is provided on the 
adapter element 10 and the other indicia 20 is provided on the mounting 
element 4 so that the indicia 20 and 21 align with one another only in the 
position when the transverse hole 11 of the adapter element 10 aligns with 
the transverse bore 12 of the mounting element 4. Additional indicating 
means may also be provided for indicating a position in which the leading 
end section 15 of the adapter element 10 is positioned across the 
transverse bore 12 of the mounting element 4 and closes this bore after 
injecting the binding material into the circumferential recess. 
Inasmuch as the adapter element 10 in use is preferably supplied together 
with the mounting element 4 the former may be connected to the latter by 
means, for instance, a thin strip as illustrated in FIG. 1, which strip is 
torn out after extracting the adapter element 10 from the central hole 9 
of the mounting element 4. 
In operation the mounting element 4 is inserted into the hole 2 as far as 
the flange 5 permits. The ribs 3 penetrate into parts of the masonry 1 
surrounding the hole 2 and reliably hold the mounting element 4 in a 
predetermined position relative to the hole 2. The flange 5 covers the 
circumferential recess formed between the outer surface of the mounting 
element 4 and the hole 2. 
Next, the adapter element 10 is inserted into the central bore 9 of the 
mounting element 4 until a shoulder of the adapter element 10 abuts 
against the flange 5. The indicia provided on the adapter element 10 and 
the mounting element 4 is brought into alignment with one another, thereby 
indicating that the transverse hole 11 of the adapter element 10 is in 
alignment with the transverse bore 12 of the mounting element 4. The key 
13 is inserted into the key groove 14 for preventing undesirable rotation 
of the adapter element 10 relative to the mounting element 4. The 
injection device 7 is inserted into the inlet part 8 of the central hole 
of the adapter element 10 and the binding material injects into this hole. 
The binding material travels through the transverse hole 11 of the adapter 
element 10, the transverse bore 12 of the mounting element 4 and fills the 
circumferential recess between the latter and the hole 2. After 
termination of the injection of the binding material the adapted element 
10 is moved in a direction opposite to the direction of insertion so that 
the leading end section 15 of the same becomes positioned across the 
transverse bore 12 and closes the latter. This position is indicated by 
alignment of the additional indicating means. The binding material is 
hardened in the circumferential recess and anchors the mounting element 4 
in the hole 2. At this point the adapter element 10 is extracted from the 
central bore 9 and the threaded element is inserted into the latter for 
mounting the object thereon. 
It will be understood that each of the elements described above, or two or 
more together, may also find a useful application in other types of 
constructions differing from the types described above. 
While the invention has been illustrated and described as embodied in 
anchoring a mounting element in a hole of masonry, 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. 
Without further analysis, the foregoing will so fully reveal the gist of 
the present invention that others can, by applying current knowledge, 
readily adapt it for various applications without omitting features that, 
from the standpoint of prior art, fairly constitute essential 
characteristics of the generic or specific aspects of this invention.