Note: Descriptions are shown in the official language in which they were submitted.
This invention relates to a form table. Such form tables are known,
and as a rule, the legs are jointcd. Construction is correspondingly expensive
in the region of these joints which, on the one hand, must be so pressure-
resistant that they can support the form and absorb the weight of concrete and,
on the other hand, must allow easy movement. These leg joints are situated
underneath the reinforcing of the form skin, so that when the legs are pivoted
inwardly, the form table still takes up a relatively large height and consequent-
ly require significant storage space. Ilandling of the forms is also awkward
and hence expensive since each leg must be actuated individually.
The present invention provides a form table comprising a form skin
supported by a plurality of elongated members, bearers arranged transversely
to the elongated members and legs mounted on the bearers which legs are pivotable
against the underside of the table, the bearers simultaneously form the pivot
for the legs mounted thereon.
The pivot for the legs is higher than in the prior art devices, so
that when the legs are pivoted inwards the form table takes up a smaller height.
Furthermore, separate joints for the individual legs are avoided. Also the
necessary loading capacity of the swivel connection thus provided is produced
automatically, since the pivot is simultansously designed as a beam.
It is desirable for the bearers to have a circular cross-section, at
least in their fastening region, the bearers preferably being tubular.
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The desired pivotability of the legs may thereby be obtained especially easily
owing to the mounting of the bearers in tube sleeves or tube pieces. In so
doing, the bearing sleeves or the like for the bearers may be mounted on the
elongate members, for example reinforcing beams.
The legs may be connected either releasably or fixedly, preferably
welded to the bearers. When one leg is pivoted, all the other legs mounted
on the same bearer are then also pivoted.
The supporting structure of the form table according to the invention
allows an especially advantageous development which consists in that the
bearers are telescopically extensible. The width of the form table may thereby
be adjusted in a desirable way. In this case, the bearers have a threefold
function in that they serve for reinforcing, for width adjustment and, finally,
as pivots for the legs.
The adjustability may be realised in a way known per se if the tube
parts engaging in one another are provided with rows of hole5 through which
passes at least one securing member such as a crossbolt.
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The legs may also be provided in their upper region with at least
one inclined reinforcing strut, the reinforcing struts engaging on the same
bearer, for example support tube or tube member, as the legs.
On the whole, a simple and easily operated construction of a form
table with legs pivotable on both sides is obtained, whereby in an advantageous
way due to the operation of one leg also at least one further leg may be
pivoted simultaneously and as small an overall height as possible may be
achieved for storage purposes. Correspondingly high parapets may be arranged
in front of rooms in which work is carried out with such a form table.
Sleeves serving as bearing points for the support tube may rest
between guide stops which pro~ect from the support tube, for example are welded
on the outsides of the tubes, so as to prevent axial movement of the support
tubes relative to the sleeves.
The invention is further described in detail hereinafter with reference
to the accompanying drawings wherein, shown partly schematically:
Figure 1 is a side view and
Figure 2 is a underneath perspective view of an exemplary embodiment
of a form table according to the invention with legs situated in the functional
position, and
Figure 3 is a side view of a wider form table according to the
invention.
- A form table 1 comprises a form skin 2 horizontal in the functional
position, a plurality of elongate members in the form of beams 3 supporting
said form skin and extending parallel to one another, two parallel bearers
4 arranged transversely to the beams 3 and four legs 5 mounted on the
bearers 4.
The bearers 4 provided for the mounting of the legs 5 also form the
pivot for the legs 5 mounted thereon, so that the legs 5 are pivotable about
the axis of the bearers 4 in the direction of the double arrows Pf 1, provided
that this pivotability is not prevented in a way yet to be described.
In the exemplary embodiment the bearers 4 are in the form of
support tubes having a circular cross-section, due to which the double
function of being able to serve, on the one hand, as rigid a bearer as
possible and, on the other hand, as a pivot may be achieved in a particularly
simple way. Provided as a bearing for the support tubes forming the bearers
4 are tube sleeves or bearing sleeves 6 which are fastened to the reinforcing
beams 3. Figure 2 shows clearly how this leads to a very simple construction.
It will be seen primarily in Figure 1 and by comparison with
Figure 3 that the support tubes forming the individual bearers 4 are each
telescopically extensible. For this purpose, each bearer 4 consists in the
exemplary embodiment of three tube members 7 and 8. The middle tube member
7 enters the two outer tube members 8 and the legs 5 are mounted on the outer
tube members 8. If one or more of the middle beams 3 together with a piece
of form skin is removed, the entire form may be made narrower in comparison
with the illustration of Figure 1 and may be made wider with a reverse
operation. The bearers 4 thereby acquire a third function.
In the exemplary embodiment the legs 5 are each welded to a
respective tube piece 8. However, a releasable connection would also be
conceivable, if dismantling w~re desired in individual cases.
Figure 2 shows that two parallel bearers are each provided with two
legs. This results in a stable form table with which the pivoting inwards of
one leg 5 simultaneously moves the other leg fastened to the same bearer 4.
Handling is consequently simplified.
In their upper region the legs 5 each have at least one, in the
embodiment of Figure 3 two, inclined stiffening struts 5a which each engage
on the same tube member 8 as the leg itself. In so doing, they lie
substantially in the same plane as the legs of a bearer 4.
For the purpose of width adjustment the tube members 8 each have
rows of holes 8a through which a securing member such as a crossbolt (not
shown~ may also pass through the tube piece 7.
Provided in the exemplary embodiment as a lock for each leg 5 is a
locking strut 9 which may engage with one end releasably on one of the beams
3 supporting the form skin 2. In this way, there is obtained with a
relatively large lever arm a good fixing which with corresponding bracing
allows precise mounting and additional stiffening. As shown in Figure 2,
the locking struts 9 are arranged in a plane lying substantially at right
angles to the form skin and to the plane occupied by the legs 5 of a bearer 4,
and project upwardly from the legs 5 diagonally to the inside of the form
table. The struts 9 are connected to a respective leg 5 at a joint 10 and to
a beam 3 at a joint 11. Furthermore, each strut 9 may be rotatable about its
longitudinal axis in relation to its swivel joint 10 situated on the leg 5
and/or to a hinged connection 12 to the beam. Adaptation to different
fastening conditions is thereby possible. Normally, however, the arrangement
of the leg fastening and of the fastening of the strut relative to the form
skin will be constant.
In a way not shown in detail, it is provided as a safeguard against
axial displacement of the tubes forming the bearers 4 that they each have
guide stops for the bearing sleeves 6 which project on the outsides of the
tube pieces and may be welded thereon.
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The form table 1 according to the invention requires relatively few
individual parts due to the fact that the profiles used as bearers are also
utilised as pivots for the pivotable legs, so that manufacture is simple,
whilst subsequent operation, also, is simple due to the fact that by the
pivoting of one leg the adjacent leg, also, is pivoted. Moreover, there is
obtained the noteworthy advantage that the pivot for the legs lies as near
as possible to the form skin, so that when the legs are pivoted inwards the
entire form table 1 occupies a correspondingly small height. Nevertheless,
width adjustment of the form table is also possible in a simple way.
