An Improved Chair Bedstead.
Year: 1896

page_text: Date of Application, 9th Mar., 1896--Accepted, 1st Aug., 1896
An Improved Chair Bedstead.
I, GUSTAV STOERMER, of 6 Sophienstrasse, Erfurt, in the Empire of Germany,
Inventor, 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 a chair or a bed in which on pressure being exerted
against the back p till the lying position is reached, and on pressure being exerted
upon the point a of the seat k till the sitting position is reached, the back and the
leg supports m will automatically pass to any desired position and remain therein
directly on the cessation of the pressure. In this case the front legs r of the chair
move forwards and backwards on their rollers. The device has the following
arrangment: The two supports p' of the back are adapted to turn at about the
two back legs g of the chair, and are connected by a joint e with the front legs r
of the chair. The back and front legs of the chair are furnished with rollers at
the ends i and h. These chair legs are united with each other at the pivots c and d
by the bars s, and the seat k pivoted at the point b to the rear legs of the chair.
The frame of the back extending from point à to g is pivoted at these two points.
In the form of a chair the leg supports m are adapted to turn about the point n,
which said supports are jointed to turn on the points o and support to follow the
movements of the back (see Figs. 1 and 2).
9.
In the form of a bed the before-mentioned movable leg supports m form part of
the bed as in Figs. 2, and 4, with the seat k. If now a person takes his place
upon the seat k of the chair or the bed the load from a to b c d has the tendency
to press the front leg r of the chair downwards at the point e. Here however a
balancing counter-action takes place. The supports p of the back take up the
pressure by means of the lever arm fe, the distribution of the load upon the back
and seat being now regulated by the lever arm f g in such a manner that the
pressure and counter pressure will be equal in all positions. For when the back is
inoved to the rear the seat will be relieved as much as the back has to support.
In this case the lever arm fb raises the front leg at the point e. The front leg
now turns about the pivot d and the point approaches the point i. At the same
time the points dc ba are raised (Fig. 2). Accordingly the device is raised under
the load by reason of the arrangement of the levers f, g and f, e, which again are
supported by reason of the other positions and proportions of the levers which
continually change, as already explained. On interrupting the movement all the
levers will therefore be held in their positions solely by the load, and thus adjust
themselves automatically under the weight of the body. Inversely, by relieving
the back and thus increasing the load on the seat the pressure of a b c d upon e
will compel the lever fg (back) to follow the movement of the body, the points
raised in the back movement being lowered again (Fig. 1). The change in the
position of the points and the friction on the horizontal surface, which the front
legs have to overcome at the points under the load at the movement, regulate
the following of all the pivots during the transition from one position to the other,
and at the same time ensure the position of repose.
my said
Having now particularly described and ascertained the nature of
invention, and in what manner the same is to be performed, I declare that what
I claim is :-
1. In a chair bedstead, the combination of the various parts described in the above
specification and illustrated in the accompanying drawing.
°

page_text: 2. In a chair bedstead the combination of the back legs q seat k supports p front
legs bars back p and rollers with the pivots, and supports m, substantially as
herein described and according to the accompanying drawing.
Dated this 9th day of March 1896.
J. P. BAYLY,
18 Fulham Place, London, W., Agent for the Applicant.