(57) The invention is a building arch for use in constructing a frame for a building.
An arch comprises several rigid strut units (1,2,3,4) each having two spaced booms
(OB, IB) in pin-jointed connection with one another. One boom (OB or IB) of each unit
is pin jointed directly to one boom of a successive unit to form a chain, and the
other boom (IB or OB) of each same unit is connected to the other boom of the same
successive unit by way of a link (7) pin jointed to the said other booms to form another
chain.
Arches of different contours may be formed using strut units of the same dimensions
by varying the number of strut units employed and by employing links of different
lengths.
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