Improvements in Collapsible Gates, Shutters, and Gangways.
Year: 1896

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Comptroller General of the 28th day of July 1897.
We, JOHN ROBERTSON of 93 Hope Street, Glasgow, Engineer and JOHN
WATT of 93 Hope Street, Glasgow, Agent, do hereby declare the nature of this
invention to be as follows:-
This invention relates to certain improvements in collapsible gates, shutters, and
gangways working on the "lazy tongs" principle.
In our invention each vertical bar or picket is (instead of being built up as
usual) made of a single solid bar of. iron or steel of I or double channel section.
The pickets are preferably rolled out to the desired section.
Slots are cut or made, at intervals, in the web of each picket for the lattice bars
or cross levers to pass through.
The lattice bars are, or may be, bent or curved at or about the centre of their
length where they cross each other and are secured to the pickets.
If desired the I pickets can be made of two channel irons secured together.
Dated this 1st day of May 1896.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow, Agent.
COMPLETE SPECIFICATION (AMENDED).
Improvements in Collapsible Gates, Shutters, and Gangways.
We, JOHN ROBERTSON of 93 Hope Street, Glasgow, Engineer and JOHN
WATT, of 93, Hope Street, Glasgow, Agent, representatives of the Solid Bar
Folding Gate Company, Limited, of 22, Bishop Street, Glasgow, duly registered
at the Office of Joint Stock Companies, Edinburgh, do hereby declare the nature
of this invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement, that is
to say:-
This invention relates to certain improvements in collapsible gates, shutters,
and gangways, working on the "lazy-tongs" principle." According to this

page_text: invention each vertical bar or picket (instead of being built up as usual of two or
more pieces) is made of a single solid bar of iron or steel of I section or double
channel section. The pickets are preferably rolled to the desired section, and
slots are cut or made at intervals in the web of each pickėt for the lattice bars or
cross levers to pass through, the lattice bars being centered on or jointed to the
pickets.
And in order that the said invention and the manner of performing the same
may be properly understood we hereunto append a sheet of explanatory drawings,
to be hereinafter referred to, and showing by way of example, a collapsible gate
and a collapsible gangway as made according to the invention.
Figure, 1, of the drawings is a front elevation of the improved collapsible gate
with the parts extended.
Figure, 2, is a front elevation (drawn to a larger scale than Figure, 1) of part
of the improved collapsible gate with the parts extended, Figures, 3, and 4, being
respectively a horizontal, and a vertical cross section of the same.
Figure, 5, is a front elevation of part of the improved collapsible gate with the
parts collapsed.
Figure, 6, is a vertical cross section of a part showing a second modification of
a detail.
Figure, 8, is a horizontal section showing a second modification of another
detail.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
In carrying out the invention according to the example of gate shown in
Figures, 1, 2, 3, 4, and 5, of the drawings we have each vertical bar or picket, A,
made in a single piece, instead of being built up as usual of two or more pieces.
Each picket, A, is of I-section to which it is preferably rolled, but it might be
of I-section as shown in Figure, 8; and it might be cast instead of being rolled.
Slots, B, are cut or made in the web, C, of each picket, A, for the lattice bars or
cross levers, I to pass through. The lattice bars, D, are in two (or it might be
more) separate sets an upper and a lower one, and they are curved at or about
the middles of their lengths, where they intersect and pass in opposite directions
Ahrough the slots, B, in the pickets, A. The lattice bars, D, are centered on
pins, E, fixed in the pickets, A, at the middle parts of the slots, B. The top end
of one lattice bar, D, and the bottom end of another outer lattice bar at the inner
and outer ends of the gate are connected to their respective outer pickets, A,
these ends being passed through slots, J, in the pickets, and made each with a
hook or catch piece, G, which holds them to the picket, while allowing them to
slide up and down the slots as the gate collapses or expands. The upper and
lower inner ends, H, of the lattice bars, D, are rounded where they come in
contact with the webs, C, of the pickets, A, so that they may move easily along
the webs as the gate expands or collapses. Parts of the intermediate flanges, K,
of the pickets, A, are cut away to leave spaces, L, for the intersection joints, M,
of the lattice bars, D, to bed into when the gate is collapsed.
The upper and lower ends, H, of the inner lattice bars, D, may be jointed
together and made so as to be able to slide up and down slots, N, in the pickets, A,
as shown in Figure, 6, the joints (M) at the points of intersection being in this
case retained or dispensed with.
Instead of making each vertical bar or picket of a single piece having a double-
channel section it may consist of two pieces of single-channel section riveted or
otherwise fixed back to back.
In the collapsible gangway shown as applied to railway carriages in Figure 7,
the bottom ends, H, of the lattice bars, D, are centered on pins, E, in the
pickets, A, while the upper ends, H, pass through slots (J) in the pickets and
are made with hooks or catch pieces (G) which hold them to the pickets while
allowing them to slide up and down in the slots as the gangway expauds or
collapses.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we are aware of the Patent
No. 2189 A.D. 1885, granted to A. W. L. Reddie and we claim nothing described
or claimed in the spcification thereof and we declare that what we claim is:-
The improved construction of a collapsible gate, shutter, or gangway on the
lazy-tongs principle in which each vertical bar or picket is made of a single metal
piece having a double-channel section or of a built-up metal piece having a like
section and has the lattice bars or levers passing through slots in its web and
jointed to it at the slots substantially as hereinbefore described.
Dated this Twenty-ninth day of January 1897.
EDMUND HUNT,
Applicants' Agent.