Improvements in Chain Ladders.
Year: 1895

page_text: Date of Application, 10th July. 1895
Complete Specification Left, 13th Aug., 1895-Accepted, 14th Sept., 1895
PROVISIONAL SPECIFICATION.
Improvements in Chain Ladders.
I, JOHN MAW, of the City of Hamilton, in the County of Wentworth, in the
Province of Ontario, Dominion of Canada, Manufacturer, do hereby declare the
nature of said invention for Improvements in chain ladders to be as follows:-
My invention relates to au improved chain ladder, especially adapted to buildings
in case of fire, the sides of the ladder consisting of chain connected by a number of
metallic cross staves for the foot, or runds.
The objects of my invention are, first, to provide a safe and durable metallic
ladder, suitable for the highest buildings, second, to afford facilities for the rolling
up of the same into a comparative small compass, also its portability on account of
its flexibility.
I attain these objects by the mechanism illustrated in the accompanying drawing
in which :-
Figure 1, is a front elevation of a portion of a chain ladder, the same may be
continued to any length, and the upper end secured to a convenient place in or on
a building.
Figure 2, is a side elevation of the same.
Figure 3, is an enlarged front elevation of one of the many metallic runds of the
ladder, this view is broken near the middle, and the same shown in section.
Figure 4, is an end elevation of the said rund, with its end malleable jaws open,
previous to connection with, and closing on the chain.
Similar letters refer to similar parts throughout the several views.
The chain which may be endless or otherwise, and capable of being suspended
from the upper part, or from any window or opening of a building, is indicated by
the letter A. The runds B, which connect the sides of said chain, are composed of
metal of a malleable nature, on account of their ends forming two deeply set side
jaws, C, that when the ladder is in course of construction, the face sides of a link
of chain is inserted between these jaws, and when in position the jaws are pressed
and closed against each face of the link, and around the outer part thereof and
below until the lower ends of the jaws touch or almost touch each other.
This simple and inexpensive method of securing the runds to the chain is the
principal element in the construction thereof.
It will be perceived that the rund is deeper in the middle than at each end, and
also rounded for the foot, and of a proper curved shape and section to ensure
the maximum of strength with the minimum of weight, this is important as regards
its portability.
The ends of the runds are recessed out, or deeply concaved, as at D, to allow
the same to fit and rest upon the upper end of the adjoining link of chain,
should the jaws possibly open, slightly, then the lower sides of openings, D, form
end stops 2, which would certainly prevent any possible end wise movement of the
rund from position.
This device of securing the runds to the chain dispenses with rivets, bolts, screws
or other mechanical contrivances, other than the two principal members which
compose the device.
Dated thie 19th day of June 1895.
JOHN H. HENDRY,
Agent.

page_text: Improvements in Chain Ladders.
JOHN MAW, of the City of Hamilton, in the County of Wentworth, in the
Province of Ontario, Dominion of Canada, Manufacturer, 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 :-
My invention relates to an improved chain ladder, especially adapted to buildings
in case of fire, the sides of the ladder consisting of chain connected by a number of
metallic cross staves, or rundles for the foot.
The objects of my invention are, first, to provide a safe and durable metallic
ladder, suitable for the highest buildings, second, to afford facilities for the rolling
up of the same into a comparative small compass, also its portability, on account of
its flexibility.
I attain these objects by the mechanism illustrated in the drawings left with the
Provisional Specification.
Figure 1, is a front elevation of a portion of a chain ladder, the same may be
continued to any length, and the upper end secured to a convenient place in, or on
a building.
Figure 2, is a side elevation of the same.
Figure 3, is an enlarged front elevation of one of the many metallic rundles of
the ladder, this view is broken near the middle, and the same shown in section.
Figure 4, is an end elevation of the said rundle with its end malleable jaws open,
previous to connection with and closing on the chain.
Similar letters refer to similar parts throughout the several views.
The chain which may be endless or otherwise, and capable of being suspended
from the upper part, or from any window or opening of a building, is indicated by
the letter A. The rundles, B, which connect the sides of said chain, are composed
of metal of a malleable nature, on account of their ends forming two deeply set
side jaws, C, that when the ladder is in course of construction, the face sides of a
link of chain is inserted between these jaws, and when in position, the jaws are
pressed and closed against each face of the link, and partially around the outer
part thereof and below until the lower ends of the jaws touch, or almost touch each
other.
This simple and inexpensive method of securing the rundles to the chain, is the
principal element in the construction thereof.
It will be perceived that the rundle is deeper in the middle than at each end, and
also rounded for the foot, and of a proper curved shape and section to ensure the
maximum of strength with the minimum of weight, this being important as regards
its portability.
The ends of the rundles are recessed out, or deeply concaved, as at D, to allow
the same to fit and rest upon the upper part of the adjoining link of chain, should
the jaws possibly open, slightly, then the lower sides of openings, D, forms end
stops 2, which would certainly prevent any possible endwise movement of the
rundle from position.
This device of securing the rundles to the chain, dispenses with rivets, bolts,
screws or other mechanical contrivances, other than the two principal members
which compose the device.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is,
"In combination, a chain ladder, composed of side chains, and metallic rundles of a

page_text: malleable nature, having end jaws to close against and fasten to the face sides of
a chain link, and resting upon the upper turn or bend of the link, substantially as
described."
JOHN H. HENDRY,
Agent.