BIFURCATING DOWEL

DOUILLE BIFURQUEE

English Abstract

ABSTRACT OF THE INVENTION
The present invention is directed to a wall anchor
with longitudinal slits and a spreading cone that is provided
with an axial screw hole. The anchor has an external thread
that extends along its whole length and permits the installation
of an adjustable wall stop in the form of a knurled nut.

Claims

26636-14
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A wall anchor comprising a sleeve with longitudinal
slits extending along part of its length, a spreading cone
that is provided with an axial threaded hole, a screw for
tightening the cone and an external thread on the sleeve, wherein
the external thread extends along the entire length of the
sleeve so as to accommodate a wall stop in the form of a nut,
the external thread simultaneously serving to anchor the sleeve
in a hole in which it is inserted.
2. A wall anchor as defined in claim 1, wherein the nut
that serves as a wall stop is a knurled nut.
3. A wall anchor as defined in claim 1 or 2, further
comprising a shaped part molded in one piece on the outer end
of the sleeve for special attachment purposes.
-4-

Description

26636-14
An Anchor
The present invention relates to an anchor, specifi-
cally, a wall anchor.
~ lready known are anchors of this kind, which have
grooves or raised portions on the outside in order to ensure that
the anchor grips well in the wall when expanded.
However, with such anchors it is difficult, when secur-
ing items that should or must be set at a distance from the
wall, to set this distance precisely and then maintain :it when
tightening fasteners, for example, screws. This problem is
especially acute when the walls that are involved are in part or
totally of wallboard. When screws are tightened, the anchor can
very easily move further into the wall, or the plaster can break.
It is the object of the present invention to provide
an anchor of the kind described in the introduction hereto such
that it can be used with an adjustable wall stop.
According to the present invention there is provided
a wall anchor comprising a sleeve with longitudinal slits extend-
ing along part of its length, a spreading cone that is provided
with an axial threaded hole, a screw for tightening the cone
and an external thread on the sleeve, wherein the external
thread extends along the entire length of the sleeve so as to
accommodate a wall stop in the form of a nut, the external
thread simultaneously serving to anchor -the sleeve in a hole in
which it is inserted.
The anchor according to the present invention possesses
, ~

~ 26636-14
the advantage that it can not only be used in the same manner
as a conventional anchor but, in specific applications can ensure
a precise~ deliberate and easily adjustable - and if necessary
subsequently readjus-table - distance from the wall of an object
that is to be secured to the wall. The previously discussed
disadvantages encountered in the case of plaster walls are
avoided. In the case of large distances from the wall surface,
the use of a knurled nut makes it possible to avoid the fact that
the slotted portion of the dowel which protrudes from the wall
will itself separate.
Embodiments of the present inven-tion are shown in the
drawings appended hereto. In the drawings;
Figure 1 is an exploded view of the anchor with its
associated parts;
Figure 2 is a side elevation of further development
of the dowel with a molded addition; and
Figure 3 is a view similar -to Figure 2 but rotated 90.
The anchor 1 is formed from a suitable plastic and in
known manner has longitudinal slots 2, these extending along the
major portion of its length from the end that is to be disposed
in the interior of the wall. The longitudinal slots 2 are diamet-
rically opposite each other, and at the end that is inserted into
the wall, are closed off by thin break-out ribs 3. The anchor 1
has an external thread along the whole of its length and if needed
this can accommodate a knurled nut 5 that can be adjusted to the
specific distance from the wall that an object to be installed
must be adjusted to.

~ 26636-14
The anchor 1 also incorporates a spreading cone 6,
this being formed of plastic and having an axial threaded hole
7 that can either be a threaded drilled ho:Le or a hole for a
self-tapping screw such as the woodscrew or l~gbolt 8 that is
shown in the drawing. The anchor 1 itselE is naturally hollow.
~fter the screw 8 has been loosened it is also possible to
adjust the distance from the wal:l by turning the knurled nut 5.
In order to prevent the cone 6 from turning as well, the cone
has small projec-tions 10 that engage in the slots 2 and the
cone is retained in the anchor 1 after it has snapped in behind
the break-off ribs 3.
E~igures 2 and 3 show a special anchor 1' on which is
molded a part 9 on the wall ext~rior end; this part 9 is used
for special attachment application. The part 9 can be used, for
example, as a guide piece when ins-talling a mounting rail for
heaters or the like, as is described in DE-OS 33 06 634. However,
other molded portions can be incorporated in the dowel 1 as
required.