An Improved Adjusting Device for Adjusting the Height of Seats.
Year: 1890

page_text: Date of Application, 7th June, 1890-Accepted, 12th July, 1890
COMPLETE SPECIFICATION.
An Improved Adjusting Device for Adjusting the Height of Seats.
We JOSEF HAUSS and JOHANNES HINKLEIN of Frankenthal in the Kingdom of
Bavaria and German Empire Manufacturers 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:-
The invention hereinafter described relates to a vertically acting adjusting device
operating by means of a spring and therefore rapidly varying the height of the seat
in chairs or stools.
The invention presents the advantage that any convenient height of seat can be
very rapidly obtained without requiring the person sitting on the chair or stool
to rise.
In the turning seats hitherto known such adjustment could only be effected by
laboriously tlrning round the seat connected with a screw spindle.
Other constructions only allow the adjustment of the seat very slowly & with
difficulty some requiring numerous rotations of a crank others again require much
power.
In seats with chain mechanism acting on three spindles the same laborious turning
is required for adjusting the seat moreover when the wood portions warp owing to
wear and tear, or to changes of temperature the spindles are no longer accurately
guided and the action of the apparatus is inexact and difficult to manipulate.
"Lazy-tongs" arrangements that have been used for raising or lowering a seat
are faulty in operation and fail to give the requisite stability to the seat.
All these defects are obviated by this invention. The drawings represent in
Figure 1 side view. Figure 2 front elevation with the working parts partly in
section.
Figure 3 shews a vertical section.
Into the plate underneath the seat a guide box b. is inserted and by suitable means
secured against rotation. The scat a. of the chair is supported upon a carrier c. in
which the screw spindle d is free to rotate and can be actuated by crank e. axlé f. and
the toothed wheels g. g. A coiled spring h. extends between the guide box b. and the
carrier c. being guided on the spindle d.
This spring tends to raise the seat which is checked by a special stop mechanism.
The said stop mechanism consists of a nut-like piece i. capable of being moved out
of engagement by spindle k. This spindle k is acted upon by a small coiled spring p.
When the seat supports
so as to make piece i. engage with the thread of the screw.
the weight of the person sitting upon it the piece i cannot be moved out of gear,
thus ensuring the greatest possible security for the seat whatever position it may be
in. A small upright spindle n. secured on the casing of the mechanism prevents
rotation of the seat.
It will readily be seen that by withdrawing the piece i. (which fits any part of the
screw thread) the spring seat can very quickly and readily be adjusted the gearing g. 9
serving only for regulating the height. The screw thread engages only with the
piece i.
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.
1. An adiusting device for chairs or stools having movable seats characterized by

page_text: the spring box b with a spindle d. that is fitted with a spring h carrying the seat, the
spring in conjunction with the piece i. permitting ready and rapid adjustment of the
heighth of the seat, in combination with the gearing e.y. g. g. all substantially as set
forth.
Dated this 7th day of June 1800
BROWNE & Co.,
60, Chancery Lane, Agents for Applicants.