Note: Descriptions are shown in the official language in which they were submitted.
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The present inven$ion relates to an improvement of the
shutterings described in my copending application Serial
No. 226, 092.
As becomes clear from that specification panels are provided
with grooves extending near an edge of a panel and two panels laid
side by side with their grooves in parallel are firmly connected
by means of a rail of a specific profile which includes "tongue
poxtions~ engaging in the said groove. In the construction
according to the said pater.t application different means have
to be provided for panels to be connected co-planarly and for those
to be connected at an angular relation to one another. Co-planar
connections are employed for shutterings used in castingthe major
face of a wall or the like; the angular connection is required when
the corner of a building structure, or a pillar is to be cast.
A~ further improvement concern~ the following: As has been
explained in the description of the invention according to mSr said ~;
patent application the rails may be slid lengthwise into the
grooves provided in the panels. For certain purposes and in some
location such sliding in of the rails would at least be awkward, if
not impossible. Therefore it had been proposed to make the
tongues on the rails narrower across than the grooves into which
they are to be inserted" Thus a narrow tongue may enter a
groove of a panel sideways, eliminating thereby the need of sliding
in a long rail the length of which might make this operation diffi-~ult.
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In such a case clamping means are required to forcibly
urge together the rails in the grooves of two vicinal panels, The
present application relates to such an improved clamping means9
Incidentally, such clamps can fulfil a further, important task.
It is the object of the present invention to pxovide panels and
connecting rails which may be used as shutterings for concrete
structures to be cast therein, the panels being connectable by means
of the same rails, both co-planarly and in angular relation to one
another,
It is a further object of the invention to provide an improved
clamp for the purpose referxed to above,
According to the present improvement each panel is provided
along at least one edge thereof with two parallel grooves and the
rails for connecting the panels are provided with profiled portions
fitting into either of the grooves, means being provided on the said
rails for forcibly urging the panels towards one another whenever
the said profiled portions of the rails are engagingly inserted în
the grooves of the two panels.
The invention will now be described in detail with reference to
the accompanying dxawings, wherein the n~w construction is shown
schematically.
Figs. 1 and 2 are both cross sectional views of the improved
panel connections. Figo 1 shows the angular relative position and
Fig. 2 the co~planar position of connected panels.
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Figs, 3, 4 and 5 illustrate schematically the improved
c onne ction.
Fig. 6 is a perspective view9 on a larger scale of an improved
clamp.
Fig. 7, is a perspective view of a form of such a clamp for
special use.
Fig. 8 is a like view of another clamp destined for use in
cases where very wide panels are to be held to one another.
Fig. 9 illustrates schematically an incidental, additional
use of the new clamps.
Turning first to Figs, l and 2: Two panels l and 2 are each
provided near an edge thereof with two parallel grooves 3 and 4,
Groove 3 is undercut (but need not be so) while groove 4 is a
V-groove (but need not be so)~
A rail 5 having a profiled tongue 51 can engage with that portion
51 in either of grooves 3 or 4, A profiled tongue member 6 is of
same profile as portion 5s and thus can also engage in either of the
t~wo grooves. To member 5 is attached a bar 71 the end 7~ of
which is formed as a presser foot. To bar 7 is turnab~r - about
an axis 8 ,- affixed a cam 9 which can be turned by a handle lO,
In Fig. l "tongue" portion 51 engages in groove 4 of panel 2,
while member 6 engages in groove 3 of panel l" The panels l and
2 are positioned to define a right angle between them. Presser
foot 7t lies against the outside of portion 5~, The cam 9 lies against
the rear of member 6. By turning the cam 9 by means of handle
- 4,--
10 strong pressure is exerted on both, member 6 and portion 5~
(onto the latter by presser foot 7~), thereby firmly urging the two
panels 1 and Z against one another and rigidly connecting them.
In Fig, 2 the two panels are placed in a common plane and abut
against one another with their edges, In this case both portions 5
and member 6 engages in grooves 3 of panels 1 and 2, Again
pressure is exerted by means of cam 9 as has been described above.
It will be seen that identical panels with identical grooves can
now be connected with one another in different relative positionsO
There are possible certain variations of construction without
departing from the gist of the invention~ While the cam mechanism
shown and described permits a quick and secure connection, it
would be possible to use different means, So e, g. pressure might
be exerted by screw or by clamps urging the panels towards
one another,
Equally the profiles of portion St and member 6 may be
different, say square - in which case the grooves 3 and 4 will be
of corresponding cross sectional shape,
The rails 5 and 6 may be of whatever length,
As can be seen from Figs. 3 and 4, the rails are inserted
sideways into thc grooves~, Then by means of bar 7 and presser
foot 7~ which are actuated by cam 9~ the two panels are forcibly
pulled together (as indicated by the arrows in Figs, 3 and 4),
-- 5 --
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At the same time pressure is exerted on both panels in the
direction of the upwardly pointing arrows in Fig~, 4, As a result
the two panels become co_planarly aligned, as is required in a
shuttering.
Fig. 5 shows in the same manner the use of the improved
connecting means applied to angularly connected panels.
The perspective view of Fig. 6 does not require further
description, the clamping member having been described in full
ab ove .
As is well known, the two walls of a shuttering are connected
by ties which span the distance between the said two walls. It is
common practice to drill holes in the planks which form the
shuttering, to provide a hold for the ties. l~rilling holes into
planks or panels of the kind of this invention would be inconvenient,
the panels are destined for repeated use and should not be defaced
by drilled holes. It ;s suggested the3refore to interpose between
two panels an expendable narrow timber plank or fillet into which
holes may be drilled and which can be discarded after one or a
few uses. So that this can be done the implement according to
Fig. 7 is used. Here the bar 7 is of such a length that it is adapted
to span a distance between two panels. In that case a narrow timber
strip or fillet can be inserted between the panels and is held there-
between when the panels are forcibly urged towards one another
It will be understood that the new clamp may either be
permanently attached to the rails (as e. gO shown in Fig. 7~ or rnay
be a separate unit (as shown eO g. in Fig. 6),
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Turning now to Fig. 8, here a bar 70, the free end of which
is formed as a rack, serves instead of bars 7 described above.
C)ne of the rails, indicated by numeral 50 can be urged into
clamping position by cam 9. The second rail 60 is shiftable on
bar 70 and can be fixed in a desired position by a pawl 61 engaging
the rack portion of bar 70., Such devices are well known and
require no further elucidation.
Fig~ 9 illustrates the use of the devices of Figs. 7 and 8.
At the left hand end of the wall which is cast in a shuttering
comprising panels ,a at one and panels b at the opposite side, a
clamping device c is provided. This device is one identical with
that shown in Fig. ~,, Between the two outermost panels ,a and b
at that end of the shuttering is held a timber plank d constituting
the end closure of the shuttering, ~Lll panels ,a and all panels b
are clamped together by clamying devices ,e which are identical
with that shown in Figr 7, Between vicinal panels - both ~a and b
are inserted wooden fillets f and are clampingly held between
the edges of the respective panels. ~Ioles are drilled into these
fillets - as mentioned above and tie rods ,~ are passed there ,-
through and are secured at the outside of the shuttering by
screwed on nut, as is well known~ Onto rods ,~ are slipped short
pieces of tubes h which serve as distance pieces between opposite
pane 1 s,
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