Improvements in and relating to Infants' Chairs.
Year: 1893

page_text: Date of Application, 20th Mar., 1893
Complete Specification Left, 19th Dec., 1893-Accepted, 20th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Infants' Chairs.
I, JOHN REID, of 5 Madiera Court, Glasgow, Lanarkshire, Cabinet Maker, do
hereby declare the nature of my invention to be as follows:-
This invention has reference to and comprises improvements in the construction
or arrangement and combination of the parts of mechanism or appliances for
actuating and locking infants chairs in their various positions, such as a rocking
frame chair, a lower carriage chair, an upper carriage chair, and an extreme upper
chair with table frame in front, and which will be more simple and efficient than
the hand operating and locking mechanism heretofore in use in such chairs.
One arrangement of my improvements consists in fitting two vertical or slightly
angled arms or levers, one on each side within the fixed side frames of the chair,
and in jointing or connecting the lower end of each of these levers to the usual
horizontal locking pin passing through an eye in each of the side frames and made
to enter any one of a series of holes formed on one set of the segmental wheels
secured to the upper part of the oscillating legs of the chair according to the
position in which the chain is desired to be locked. These vertical levers are each
fulcrumed near their lower end on a transverse bar or rail extending between the
two fixed side frames; and are jointed or connected at their upper end each to the
outer end of a horizontal or slightly angled link. These links are jointed or
connected at their inner ends to the upper and lower parts respectively of a turning
or oscillating vertical plate or disc. This disc is mounted on the one end of a hand
turning spindle passed through and carried by a kneed bracket bolted to the centre
back part of the upper seat frame of chair. A helical spring is mounted round this
spindle, having its one end attached to the oscillating disc and the other end
secured to the fixed bracket, so that when the spindle is turned by a hand knob at
its outer end against the power of the spring the oscillating disc will act through
the horizontal arms on the vertical levers and swivel these to bring the locking
pins at their lower ends out of the holes in the segmental wheels on legs of chair,
and free the chair for being brought to any of the desired four positions, in any of
which it would, by simply releasing the hand knob, be automatically locked by the
recoil of the spring. Instead of a spring or springs being connected to the disc
plate which operates the levers, a spring or springs may be connected between the
apper arms of the levers to draw them together.
By a modified arrangement instead of operating the locking mechanism by a hand
spindle behind the chair, this can be done by the free ends of pulling cords or
chains from either side of the chair. In this arrangement the kneed bracket would
extend transversely across the under surface of the seat frame, and the upper ends
of the swivelling vertical levers would pass through slots in the borizontal pro-
ecting plate of this bracket, and be connected to each other by movable cords or
hains passing through eye hooks at the ends of the brackets and through slots in
he opposite levers. A helical spring or springs would also be connected between
he upper ends of the vertical levers; and short loose cords or chains would be
ttached to eyes on the levers, so that when one of the cords was pulled by hand
rom either side of the chair against the power of the spring the levers would
e swivolled to bring the locking pins out of their holes in the legs of the chair;

page_text: while by releasing said cords the recoil of the spring would automatically operate
the levers and pins to lock the chair in any of the four positions desired.
Dated the 18th March 1893.
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Infants' Chairs.
1, Jons REID, of 5 Madiera Court, Glasgow, Lanarkshire, Cabinet Maker, do
hereby declare the nature of my invention, and in what manner the same is to
bo performed to be particularly described and ascertained in and by the following
statement in writing that is to say :-
This invention has reference to and comprises improvements in the construction
or arrangement and combination of the parts of mechanism or appliances for
actuating and locking infants' chairs in their various positions such as a rocking
frame chair, a lower carriage chair, an upper carriage chair, and an extreme upper
chair with table frame in front, and which will be more simple and efficient than
the hand operating and locking mechanisin heretofore in use in such chairs.
And in order that my said invention and the manner of performing or carrying
the same into effect or practice may be properly understood, I have hereunto
appended an explanatory sheet of drawings in which the same reference letters are
used to indicate corresponding parts in all the figures where shown.
Figure 1 is a sectional elevation of part of an infant's chair looking from the
front towards the back, as fitted with one arrangement of my improvements, and
Figure 2 is a detached side section corresponding to Figure 1.
Figures 3 and 4 represent detached front and side view of the operating handle
and connecting lever fittings; while Figure 5 is a view corresponding to Figure 1
showing a slightly different modification of the spring fittings.
Figure 6 is a view corresponding to Figure a showing an arrangement of my
improvements in which drawing cords are used; and Figure 7 is a sectional plan
view corresponding to same.
Referring to these drawings:-Que arrangement of my improvements, as shown
in Figures 1 to 4, consists in fitting two vertical or slightly angled arms or
levers a a one on each side within the fixed side frames A, of the chair, and in
jointing or connecting the lower end of each of these levers a to the usual
horizontal locking pin passing through an eye at A' in each of the side frames A
and made to enter any one of a series of holes B', formed on one set of the
segmental wheels 13 secured to the upper part of the oscillating legs of the chair
according to the position in which the chair is desired to be locked. These vertical
levers a a are each fulcrumed at near their lower end on a transverse bar or
rail B extending between the two fixed side frames A; and are jointed or
connected at their upper end each to the outer end of a horizontal or slightly
angled link b. These links are jointed or connected at their inner ends to the
upper and lower parts respectively of a turning or oscillating vertical plate or
disc b. This disc is mounted on the one end of a band turning spindle passed
through and carried by a boss on a kneed bracket e bolted to the centre back part
of the upper seat frame 13 of chair. A helical spring is mounted round this
boss which carries the spindle c having its one end abutting against a stop pin b³
on the oscillating disc ', and the other end abutting against the stop pin on
the bracket so that when the spindle c, is turned by a hand knob c
at its outer end against the power of the spring the oscillating disc b
will act through the horizontal arms b on the vertical levers a and swivel
these to bring the locking pins a' at their lower ends out of the holes B¹ in the
segmental wheels B on legs of chair, and free the chair for being brought to any

page_text: of the desired four positions, in any of which it would, by simply releasing the hand
knob c, be automatically locked by the recoil of the spring c. Instead of.
spring
ci
or springs being connected to the disc plate 6' which operates the levers,:
spring e
or springs may be connected between the upper arms b, b, of the versa,
to draw them together, as shown in Figure 5.
By a modified arrangement, as shown in Figures 6 and 7, instead of operating the
locking mechanism by a hand spindle c, c, behind the chair, this can be done by
the free ends of pulling cords or chains from either side of the chair. In this
arrangement the kneed bracket c" would extend transversely across the under
surface of the seat frame, and the upper ends of the swivelling vertical levers a
would pass through slots in the horizontal projecting plate of this bracket cl, and
be connected to each other by movable cords or chains & passing through eye hooks
or over pulleys d' on the ends of the brackets c" and through cyc or slots in
the opposite levers. A helical spring e or springs would also be connected between
the upper ends of the vertical levers a; and short loose cords or chains e' would be
attached to eyes e on the levers a, so that when one of the cords was pulled by
hand from either side of the chair against the power of the spring e, the levers a
would be swivelled to bring the locking pins a out of their holes B₁ in the legs
of the chair; while by releasing said cords e the recoil of the spring e would
automatically operate the levers a and pins a¹ to lock the chair in any of the four
positions desired.
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 :-
First. In infants chairs, the arrangement and use of actuating and locking
mechanism, consisting of vertical or angled levers, connecting lever arms, and a
turning disc and spindle and recoil acting spring or springs, substantially as and for
the purposes herein described in reference to and shown in Figures 1 to 4 and 5 of
the accompanying drawings.
Second. In infants chairs, the arrangement and use of actuating and locking
mechanisin consisting of vertical or angled levers, and lever connecting and
actuating cords or chains, and a recoil spring or springs, substantially as and for
the purposes herein described in reference to and shown in Figures 6 and 7 of the
accompanying drawings.
Dated the 18th December 1893.
W. R. M. THOMSON & Co.,
06, Buchanan Street, Glasgow, Agents.