Year: 1888

page_text: I VALENTIN LANDSBERG of No. 4 Bismarck Strasse in the Town of Posen. Germany,
Merchant, 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 an improved chair in which the seat is adjustable, so
that the same can be raised or lowered as may be desired, and will be securely held
in any position by means of appropriate clamping levers which can be released from
their grip with the vertical guide rods by means of a knob or handle arranged so as
to be readily operated on.
In the accompanying drawings Fig. 1 is a vertical section.of.the chair, and Fig. 2
is a partial top view of the same with the seat removed.
Vertical rods a are fixed in appropriate manner to the lower surface of the frame-
work of the seat h, or to the seat itself and arranged to glide up and down in
suitable tubes or guides 6 preferably either fixed to or located with the legs of the
said chair.
The upper ends of the tubes bare either slotted or are screwed or fixed to suitably
formed shells or sleeves c cut away at c¹ so that the case hardened ends d² of the
clamping levers & can firmly grip or gear with the rods a fixed to the seat frame h.
The clamping levers d turn on the bolts d', which run through the rail or rails e
of strong sheet or thin bar or single iron, the ends of which can be bent over to
form the sleeves c or the sleeves c can be made of a separate piece of metal and be
screwed or otherwise attached to the rail or rails e or the frame of the chair.
The opposite ends of the clamping levers d are carried by springs f of helical form
and hung in the eyes f¹, but flat springs can be used. I prefer, however, to employ
helical springs as the same are not so liable to be ruptured as flat or leaf springs.
The clamping levers d will allow the seat to be raised but will allow no down-
ward movement until the said levers are brought out of gear with the rods or by
operating the knob or handle i.

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As soon as the seat h has been raised to the desired height the hardened tips
the levers d will securely grip or gear with the rods a and thus prevent all downward
movement of the seat which is thus held in raised position so that the heavier the
weight is on the seat the firmer will be the grip of the ends of the clamping
levers & on the rods a.
In order to release the levers d from their grip on the rods a, and allow the seat h
to be lowered, 1 employ a formed bent rail k, the ends of which are arranged
to turn on suitable hinges 1. The forward end of the rail is carried by a helical
spring o hung in an eye o¹, said rail being furthermore provided with a knob or
handle i.
On each side of the rail k is a lug m carrying a bolt n or its equivalent which latter
lies immediately above the rear ends of the clamping levers d without in any way
preventing the lowering of the same.
If it is desired to lower the seat the knob or handle i, and consequently the lugs m
and rail are depressed until the bolts n or their equivalents come in contact with
the rear arms of the levers d, press the same downwards and release the tips d'
from their gear with the rods a so that the said seat can be readily lowered.
As soon as the knob or handle i is released, the lever will be immediately
raised by the spring o and the rear ends of the clamping levers by the springs f
so that the forward end d³ of the said clamping levers will be caused to immediately
grip or come into gear with the rods a.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved device for vertically adjusting the height of the seats of chairs
and the like, consisting of the clamping levers d, the tips d² of which gear with
the rods a guided in the tubes b, and sleeves c, c¹ so that the seat can be readily
raised, but can only be lowered by operating the rail k, substantially as set forth,
and shown on the drawings.
2. The construction and arrangement of the parts in my improved chair, substantially
as set forth and shown on the drawings, or any mere modification of the same.
Dated the 7th day of August 1888.
PHILIP M. JUSTICE,
Associate Agent.