Improvements in or relating to Roofing and other Parts of Buildings.
Year: 1891

page_text: Date of Application, 21st Feb., 1891
Complete Specification Left. 20:h Nov., 1891-Accepted, 24th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in or relating to Roofing and other Parts of
Buildings.
I, JAMES ALEXANDER MAIN of Clydesdale Iron Works, Possil Park, in the
City of Glasgow, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in or relating to roofing and other parts
of buildings and as regards the roofing it consists in improved methods of supporting
purlinebars on the rafters.
Under the invention the rafters which are preferably composed of T-iron bars
have at the parts where the purlines are to be attached a notch or recess cut out
on each side of the head of the T.
Against the part of the rafter where the said notches are made an angle iron is
laid and in the flange of the said iron bearing against the T-head slots are made at
points coincident with the recesses.
Through these slots ends of a bar or strap of steel or other metal are passed
the said ends entering the recesses and being bent upon the head of the T on
cach side of the mid-rib so as to hold the angle iron in position and by this means
the necessity of punching bolt or rivet holes in the head or cross flange of the T
is dispensed with.
The purline bars are secured to the cross angle irons or under a modification the
angle irons may be dispensed with and the purline bars secured direct to the
T-headed rafters by the bent metallic straps hereinbefore referred to.
The invention is also applicable to other parts of buildings for example the
T-headed bars may be arranged vertically in the sides of the buildings and the cross
angle bars secured to them as set forth may afford convenient soles or rests for the
support of plummer blocks or brackets carrying machinery shafting or for other
analogous purposes.
In some cases the T bars and cross angle bars connected to them may instead of
being composed of metal be made of wood or other material.
Dated this Twentieth day of February 1891.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in or relating to Roofing and other Parts of
Buildings.
I, JAMES ALEXANDER MAIN of Clydesdale Iron Works, Possil Park in the
City of Glasgow, Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
This invention has for its object improvements in or relating to roofing and
other parts of buildings and as regards the roofing it consists in improved methods
of supporting "purline" bars on the rafters.
On the accompanying drawings
Figure 1 is a side elevation, Figure 2 a plan and Figure 3 an end elevation
shewing one method of carrying the invention into effect and under which the rafters a
which are preferably composed of T-iron bars have at the parts where the purlines b

page_text: are to be attached a notch or recess e cut out on each side of the head of the T.
Against the part of the rafter where the said notches are made an angle iron
plate is laid and in the flange of the said iron bearing against the T-head
slots e are made at points coincident with the recesses c.
Through these slots ends of a strap of steel or other metal are passed the said
ends entering the recesses c and being bent upon the T-head of the rafter a on each
side of the mid-rib so as to hold the angle iron plate d in position. By this means
the necessity of punching bolt or rivet holes in the T-head or cross flange of the
rafter is dispensed with.
The purline bars are secured to the angle iron plates by bolts, rivets or other-
wise or under a modification illustrated by Figures 4 and 5 of the drawings the
angle iron plates may be dispensed with and the purline bars 6 secured direct to
the T-headed rafters by the bent metallic straps as hereinbefore described.
The invention is also applicable to other parts of buildings for example the
T-headed bars may be arranged vertically in the sides of the buildings and the
cross angle plates or bars secured to them as set forth may afford convenient soles
or rests for the support of plummer blocks or brackets carrying machinery shafting
or for other analogous purposes.
In some cases the T bars and cross angle plates connected to them may instead
of being composed of metal be made of wood or other material.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed declare that what I
claim is
The improved methods hereinbefore described with reference to the accompanying
drawings of securing purline bars brackets or angle irons to rafters and other parts
of buildings.
Dated this Nineteenth day of November 1801
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.