Improvements in and relating to Infants' Chairs.
Year: 1891

page_text: Date of Application, 27th Jan., 1891 -
Complete Specification Left, 24th Oct., 1891-Accepted, 28th Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in and relating to Infants' Chairs.
We, JOHN WALKER, WILLIAM SEATON MCLENNAN, and JOHN 'BOWMAN
LINDSAY, all of the firm of John Walker and Company; Chair Manufacturers, of
372 Scotland 'Street, Glasgow, Lanarkshire, do hereby declare the nature of our
invention to be as follows:-
:-
This invention has reference to improvements in and relating to the construction
and action of the chair known as the "American or adjustable baby chair," in
which the chair and its frame are mounted on the upper end of two swivelling double
feet on opposite sides fulcrumed to the saddle or lower part of the frame of the chair
proper, and geared together by segmental wheels to oscillate simultaneously, so as
to be locked and unlocked at different heights or positions. Heretofore these chairs
have been locked and retained in their different heights and positions of the
expanding legs by the toothed segments on the fulcrum end of the legs, which have
travelling wheels mounted on their lower ends. But by the present improvements
the chair is retained or locked in two positions a' high position as a stationary chair
and a lower position as a carriage chair by the upper cross stay rails between the
legs at a further distance from their fulcrum by a more simple construction of chair
and arrangement of mechanism, and which will at the same time give greater
stability to the chair than heretofore.
One arrangement of mechanism for locking the chair in its highest position,
consists in fulcruming a light lever to the upper transverse stay rail of the front
feet and leading it back, with a deep knee catch projecting down over a knee metal
projection secured in the centre and front upper part of the upper cross stay rail of
the front legs; and in jointing to the front of this lever the lower end of a vertical
pulling disengaging rod mounted in a guide at its upper end screwed to the back
seat part of the chair, with a hand pulling handle above and having a helical or
other spring mounted on it under said guide, for pressing the rod and catch end of
the lever down to automatically take into the knee catch on the cross rail, and so
lock the two rails and feet at a fixed distance apart when the chair is raised to its
highest position, the spring pressing the catch into action. For disengaging the
chair and lowering it to its rolling position on its wheels, the person with one hand
catches the back rail of the chair and handle of the draw rod, so as to pull this up
against the power of the spring and disengage the catch lever and at the same time
lower the chair to its fixed lower position, determined by projections formed on the
lower front and back parts of the saddle, which rest on the ends or shoulders of the
said cross stay rails in their expanded position; thus supporting the chair on the said
rails of the legs, which form stops to the further descent of the chair or the legs,
when the wheels on both sets of legs are then in a position for rolling the chair on
the floor. Then to draw and retain the chair up to its highest position again, it is
only necessary to pull the chair up, when the weight of the legs will cause them to
fall and engage the rails under and within the catch lever automatically by the
action of the spring rod.
Instead of engaging and disengaging the said catch lever by a pulling spring rod
at the centre of the back of the chair direct, a link rod may be attached to it under
the chair, and connected at the top to a transverse lever under the seat fulerumed
to the inside of one back arm of the saddle, having the other end of this lever
connected to the lower end of a pulling spring rod passed up through a guide or
guides in the seat on the opposite side or arm of the chair, with a cross handle on
it, so that the person in taking hold of the arms of the chair from behind would pull
up this vertical spring rod and transverse lever and so by the link under the chair

page_text: draw up the catch lever to disengage it, in the act of lowering the chair, to its
lowest position to rest on the saddle and cross rails, or vice versa allow this spring
rod under the arm and lever to automatically engage the catch lever in the act of
lifting the chair to hold it in its highest position.
Or instead of a cross lever, a cross bar might be used with two such pulling
spring rods one under each arm, and two such catch levers might also be used at
distances apart to catch and retain the cross rails-ing theirenearest and highest
position.
The 1901
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Infants' Chairs.
We, JOHN WALKER, WILLIAM SEATON MCLENNAN, and JOHN BOWMAN
LINDSAY, all of the firm of John Walker and Company, Chair Manufacturers, of
372 Scotland Street, Glasgow, Lanarkshire, do hereby declare the nature of our
invention, and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement in writing, reference
being had to the accompanying drawings, that is to say :-
This invention has reference to improvements in and relating to the construction
and action of the chair known as the "American or adjustable baby chair" in
which the chair A and its frame A' are mounted on the upper end of two swivelling
double feet B, B¹, on opposite sides fulcrumed to the saddle A', or lower part of
the frame of the chair proper, and geared together by segmental wheels 132, B²,.
to oscillate simultaneously, so as to be locked and unlocked at different heights or
positions. Heretofore these chairs have been locked and retained in their different
heights and positions of the expanding legs B, B', by locking segments on the
toothed segments B2, B2, at the fulcrum end of the legs B, B', which have travelling
wheels mounted on their lower ends. But by the present improvements the chair
is retained or locked in two positions, a high position as a stationary chair, and a
lower position as a carriage chair by the upper cross stay rails C, C', secured
between the legs B, B, and B1, B1, at a further distance from their fulcrum by a
more simple construction of chair and arrangement of mechanism, and' which will at
the same time give greater stability to the chair than heretofore.
And in order that our said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, we have hereunto
appended an explanatory sheet of drawings, in which
Figure 1 represents a sectional side elevation of a baby chair in its high position
having our improved locking spring catch lever and fittings applied thereto. And
Figure 2 is a back elevation of our improved fittings showing the spring rod a², að,
and handle a³, detached and at right angles to that shown in Figure 1.
Referring to these drawings.-This arrangement of mechanism for locking the
chair in its highest position, consists in fulcruming a light lever a to a piece a
secured to the upper transverse stay rail C of the front feet B and leading it
back, with a deep knee catch at a projecting down over a knee metal projection C",
secured in the centre and front upper part of the upper cross stay rail C' of
the back legs B'; and in jointing at a to the free end of this lever a, a, the
lower end of a vertical pulling disengaging rod a mounted in a guide a', at its
upper end screwed to the back seat part A of the chair; with a hand pulling
handle a above, and having a helical or other spring a mounted on it under
said guide a for pressing the rod a³, and catch end a", of the lever a, a, always
down to automatically take on to the knee catch C", ou the cross rail C¹, and
so lock the two rails C C and feet B, B', at a fixed distance apart when the
chair is raised to its highest position, as shown in Figure 1, the spring a pressing

page_text: the catch a into action. For disengaging the chair and lowering it to its carriage
rolling position on its wheels, the person with one hand catches the back rail A
of the chair and handle a³, of the rod a² so as to pull this up against the power of
the spring and disengage the catch a" of the lever and at the same time lower
the cbair to its fixed lower position, determined by projections at A2, formed on the
lower front and back parts of the saddle frame A', A', which rests on the ends
or shoulders of the said cross stay rails C, C1, in their expanded position, as shown
dotted in in Figure 1, thus supporting the chair on the said rails C, C¹, of the
legs B, B', which form stops to the further descent of the chair or the legs B, B',
when the wheels on both sets of legs are then in a position for rolling the chair on
the floor as a carriage chair. Then to draw and retain the chair to its highest
position again it is only necessary to pull the chair up by the rail A", or its arms A,
when the weight of the legs B, B, will cause them to fall and engage the rails C, C,
under and within the catch lever a, a", automatically by the action of the spring
rod a², a³.
Instead of engaging and disengaging the said catch lever a, a, by a pulling
spring rod a, a, at the centre of the back of the chair direct, a link rod may be
attached to it under the chair, and connected at the top to a transverse lever under
the seat A fulcrumed to the inside of one back arm of the saddle A¹, having the
other end of this lever connected to the lower end of a pulling spring rod passed up
through a guide or guides in the seat A on the opposite side or arms of the chair,
with a cross handle on it so that the person in taking hold of the arms of the chair
from behind would pull up this vertical spring rod and transverse lever and so by
the link under the chair draw up the catch lever a all to disengage it, in the act of
lowering the chair, to its lowest position to rest on the saddle A' and cross
rails C, C, or vice versa allow this spring rod under the arm and lever to auto-
matically engage the catch lever a, a"; in the act of lifting the chair to hold it in its
highest position.
Or instead of a cross lever a cross bar might be used with two such pulling spring
rods one under each arm, and two such catch levers might also be used at distances
apart to catch and retain the cross rails C, C, in their nearest and highest
position.
.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
First. The construction or arrangement and combination of the parts of infants
chairs with a catch lever for automatically locking its legs in its highest position
and with stops on its saddle frame for retaining it in its lowest carriage position,
substantially as herein described in reference to and by way of application shown in
the accompanying drawings.
Second. In infants chairs the construction and use of an engaging and disengaging
catch lever fitted to engage with transverse rails or projections on the chair legs,
and actuated by a spring rod, substantially as and for the purposes herein described,
in reference to and by way of application shown in the accompanying drawings.
Third. In infants chairs, the securing of the chair and legs in their lowest position
as a carriage chair by stops on the saddle frame, substantially as herein described.
Dated the 23rd October 1891.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.