Arrangement for use in joining together two plate-shaped elements

An arrangement for use in joining together two plate-shaped elements (10a, 10b, 18a, 18b), especially boarding members, which form an angle (a) usually 90.degree., with each other, comprises an angled means (11), one leg (12) of which extends substantially at right angles to the main plane of the one plate-shaped element (10b, 18b) and projects away from the second plate-shaped element (10a, 18a), and the other leg (13) of which extends substantially at right angles to the main plane of the second plate-shaped element (10a, 18a) and projects away from the first plate-shaped element (10b, 18b), legs (12, 13) of the angled means (11) forming abutments against a surface (14a, 14b) which is rigidly connected to the respective plate-shaped element and is detachably fastened to the latter.

The present invention relates to an arrangement for use in joining together 
two plate-shaped elements, which form an angle, usually 90.degree., with 
each other. 
In the boarding of posts, girders and the like there are employed according 
to known engineering practice, which has changed little the last 10-20 
years, boarding elements which are held together by means of various 
collars or the like which are fastened with relatively short intermediate 
spaces around the boarding and thereby hold the individual boarding 
elements in position. This solution is very demanding on labour and time 
in that the collars have to be nailed to the boarding elements and have to 
be removed after use. 
By the very fact that the boarding work in many casting operations 
constitutes a substantial portion of the costs, improvements are 
constantly being sought after, but as mentioned above without significant 
changes having been made in engineering in recent years. 
The need for improvements is thus apparent, and the object of the present 
invention is to effect boarding of corners more rapidly and simpler and 
hence cheaper. 
This is achieved by means of an arrangement which is designed as an angled 
means, one leg of which extends substantially at right angles to the main 
plane of the one plate-shaped element and projects away from a second 
plate-shaped element, and the other leg of which extends substantially at 
right angles to the main plane of the second plate-shaped element and 
projects away from the first plate-shaped element. The legs of the angled 
means forming abutments against a surface, which is rigidly connected to 
the respective plate-shaped element and is detachably fastened to the 
latter.

FIG. 1 shows a horizontal section of an arrangement according to the 
invention for use in boarding of a corner in for example a post by means 
of boarding cassettes where the angle a between the boarding cassettes is 
90.degree.. 
Each boarding cassette consists of two plates 10a, 10a' and 10b, 10b' 
respectively, which are usually made of plywood and which have a certain 
spacing, for example 10 cm. from each other. Each of these plates can 
alternately face towards the concrete. Between the surfaces there is 
arranged along their edges a U-shaped element, legs of which, such as the 
leg 16a, project outwardly as an extension of the plates i.e. in alignment 
with the plates. In addition the element is designed with an inwardly 
projecting flange which the plywood plates form an abutment against and 
which they are detachably fastened to by means of for example rivets (not 
shown). 
On boarding a corner, two boarding cassettes 10a, 10b are mounted at an 
angle a to each other as illustrated in FIG. 1. In the illustrated 
embodiment, the angle is as mentioned 90.degree., something which moreover 
is the most customary. An angled means 11 having legs 12, 13 which form an 
angle which is as large as, but opposite relative to the angle a between 
the cassettes 10a, 10b, is arranged between the outwardly projecting legs 
of the boarding cassettes. The angled means 11 forms thereby an abutment 
against the bottom 14a, 14b of the U-shaped element of the boarding 
cassette and forms with its free end 15a, 15b an abutment against the 
outwardly projecting leg 16a, 16b of the U-shaped element. At the top part 
the angled means 11 is as illustrated, angled in the form of steps, so that 
it forms an abutment against each U-shaped element, which is an extension 
of the inner plate 10a, 10b. In this way the angled means 11 will be 
arranged safely in position between the outwardly projecting members 16a, 
16b and is fixed to the bottom 14a, 14b of the U-shaped element by such 
means as detachable bolts 17 or clamps. As a result, the unit which 
consists of the two boarding cassettes 10a, 10b and the angled means 11 
will be held rigidly together with minimal possibilities for displacement 
relative to each other. Also the angled means 11 is usually made of 
aluminum, but can also be made of other materials, for example galvanised 
steel. The breadth of the means 11 can be varied, from a relatively narrow 
strip to the whole length or breadth of the boarding cassette, and the 
length of each leg corresponds to the distance between the plates of the 
cassette. 
FIG. 2 shows a corresponding section to FIG. 1, where there are employed 
boarding members 18a, 18b instead of boarding cassettes. In this 
embodiment, an element 19a, 19b projects substantially at right angles 
outwardly from a respective boarding element 18a, 18b with projections 
20a, 20b which the boarding member are detachably fixed to, for example by 
means of rivets not shown. The elements 19a, 19b extend over the whole 
respective length and breadth of the boarding member. A certain section 
which is not critical projects outwardly from the boarding member, but 
which is adapted to the length of legs 12, 13 of the angled means 11. At 
its free end, each of the elements 19a, 19b is angled, so that the free 
end of the means 11 forms an abutment against angled portion 21a, 21b of 
the respective element 19a, 19b, which extends in an opposite direction 
relative to projection 20a, 20b of the element. In a corresponding manner 
as in the embodiment of FIG. 1 the angled means 11 is fixed to the element 
19a, 19b by means of bolts 22 or rivets, so that the means 11 can be 
detached in a simple manner from the element 19a, 19b after use. Also in 
this embodiment there is provided a reliable and good bracing and locking. 
FIG. 3 shows a perspective view of means 11 is disposed relative to the 
elements 19a, 19b. As indicated, a second angled portion 23a, 23b, 
projects in the opposite direction relative to the angled portion 21a, 21b 
and functions as a support for rivets, so that the rivets are not able to 
become displaced outside and thereby no longer lock together legs of the 
angled means 11 and the elements 19a, 19b. 
The invention is described in connection with boarding, either by means of 
boarding cassettes or boarding members, but it can be applied in the 
production of dismountable containers or boxes of many different types. 
Such an application can prove to be very interesting because of the great 
flexibility which the arrangement of the invention makes possible.