Year: 1887

page_text: 1, JOAQUIN TORRES CANOSA of Barcelona, in the Kingdom of Spain, 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
This invention relates to adjustable seats such as music stools and the like, the
upper surface or seat of which is capable of vertical movement and of being retained
at any desired height. The improvements consist principally in the means for
supporting the upper surface or seat at the height required.
For this purpose, the said seat is supported from the lower framework of the chair
or stool upon the upper end or ends of one or more rack bars or ratchet bars which
may be fixed at suitable height with regard to the lower frame by means of pawls or
rods or levers acting as pawls which may be released and returned into engagement
by hand assisted by suitable springs weights or otherwise.
Referring to the accompanying drawings
Fig. 1 represents in front sectional elevation a chair fitted with the improved
adjustable seat.
Figs. 2, 3 and 4 are cross sections on line y Fig. 1 showing various modifications
in the means and method of operating the fixing of the racks.
Fig. 5 detail views of a convenient form of rack.
Fig. 6 on an enlarged scale the device for determining the upward movement of
the seat.
Fig. 7 a detail view showing a modified form of rack.
The chair seat A is supported by the upper ends of the racks sliding in vertical
grooves or pits preferably in the corners of the under framework B. The racks may
be of any shape but are preferably T shaped as shown in Fig. 5 and provided with
ratchet teeth the lower faces of which are horizontal as illustrated. The racks may
also be circular as indicated in Fig. 7. On raising or lowering the seat of the chair,
the said racks will move up or down in the frame and are secured in the desired
position by suitable devices.

page_text: Fig. 2 illustrates a convenient mode as applied to four legged seats for simultaneously
engaging or disengaging the four racks. D D are rods pivoted to the bar F and
crossing each other so as to engage with their opposite ends diametrically opposite
racks CE is a spring tending to retain the ends of the rods D in engagement with
the teeth of the racks. H is a plate or rod guided on the bar F by pins fixed in said
bar and passing through slots in the said plate or by other means. To this plate H
are pivoted rods R R connected as shown to the cross rods D D. The plate H is
provided with a suitable handle Z, by which it may be drawn so as to disengage the
rods D from the teeth of the racks. Fig. 3 illustrates a second mode of performing
the same engagement or disengagement of the racks. a a are sliding bolts one for
each rack, the same being held in engagement with the teeth of the racks by suitable
springs gg-The plate His connected with ends of the bolts by chains cords or the
like in any suitable manner so that drawing-of-the-plate H causes a simultaneous
withdrawal of all the bolts a. This arrangement is also suitable for chairs or stools
with more or less than four legs or four racks. Instead of guiding a rack in each leg
of the chair or at other suitable places around the frame, a single rack may be
arranged in the centre as shown in Fig. 3. In this case the place of the outer or
corner racks may be conveniently taken by guide rods C as illustrated, by which
greater steadiness is given to the seat. Here also the plate H gears direct with the
teeth of the central rack J, against which it is pressed by the spring R¹.
If the racks are provided with ratchet teeth, the seat can be raised by upward.
pressure thereon, the rods or bolts being momentarily pressed out of action by the
inclined teeth of the racks.-The plate M serves to previously fix the height to which
tho sout shall be raised.-It may be provided with a vertical row of holes the distance
between which is equal to that between-the-faces-of-the rack teeth, and be fixed to
the lower frame or to the seat; a peg inserted-through-the corresponding hole serves
as a stop for the upward movemont of the seat at the desired point.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is:
In stools or chairs:
(1) The combination with vertically movable seat of racks supporting the same and
adapted to be secured by rods engaging the teeth of said racks.
2) The combination with a vertically movable seat of four racks guided in the
corners or other part of the lower frame pivoted cross-rods engaging the teeth of said
racks, a sliding plate or equivalent H serving to deiach them from the racks and a
spring E substantially as and for the purpose set forth.
3) The combination of a vertically movable seat with racks guided in the lower
frame, spring-bolts a, cords or equivalents L and sliding plate or equivalent H
substantially as and for the purpose set forth.
4) The combination of a vertically movable seat, of guides c' and central rack, and
spring bolt H substantially as and for the purpose set forth.
5) The combination with a movable seat and rack-work as set forth, of a plate M
provided with holes or grooves corresponding to the teeth of the racks, and into
which may be lodged or fixed a button or peg for determining the movement of the
seat substantially as set forth.
Dated this 28th day of April 1887.