Improvements in the Means and Method of Actuating Dental and the like Chairs or Couches.
Year: 1888

page_text: Date of Application, 15th June, 1888
Complete Specification Left, 21st Jan., 1889
Complete Specification Accepted, 23rd Feb., 1889
PROVISIONAL SPECIFICATION.
Improvements in the Means and Method of Actuating Dental and
the like Chairs or Couches.
I JOHN ELLIS of "Keynsham" Sandown Isle of Wight Gentleman do hereby
declare the nature of this invention to be as follows:-
This invention relates to improvements in the means and method of actuating the
chairs used by dentists or other like surgical chairs or couches which periodically
require raising or lowering and has for its object the use and application of hydraulic
power for such purposes.
The frame of the chair or couch or the mechanism for tilting the said chairs
is attached to the end of the piston rod or to a crank arm actuated by the piston
rod from a hydraulic cylinder of suitable dimensions and construction.
On opening a valve water under pressure is admitted to the cylinder and so
the chair or couch is raised, and is lowered again by letting the water out of the
cylinder.
Dated thia 15th day of June. 1888.
TONGUE & BIRKBECK,
34, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: the like 'Chairs or Couches.
I, JOHN ELLIS of " 'Keynsham" Sandown Isle of Wight Gentleman 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 improvements in the means and method of actuating the
chairs used by dentists and the like surgical or other chairs or couches which from
time to time require raising lowering tilting or other movements and has for its object
the use and application of hydraulic power for such purposes.
The frame of the chair or couch or the mechanism for tilting or moving the
said chair is attached to the end of the piston rod or to a crank arm actuated by
the piston rod from a hydraulic cylinder or cylinders of suitable dimensions and
construction.
On opening a valve water or other like or suitable liquid or fluid under pressure is
admitted to the cylinder (or it may be cylinders) and so the chair or couch is raised
tilted or otherwise moved and is lowered or restored again to its normal position by
letting the water or other fluid out of the cylinder.
The water or the like fluid under pressure may be obtained from the main or other
source where sufficient pressure exists or in any other suitable or convenient manner
for instance this pressure may be obtained by a small force pump actuated by
the hand or foot of the dentist or other person requiring to thus actuate the chair
or couch.
And in order that my present invention may be easily understood and readily
carried into practice I will proceed to describe the same with reference to the
accompanying sheet of drawing which for the sake of example I have annexed to
show one method of carrying out my said invention.
DESCRIPTION OF THE DRAWING.
The Drawing shews a sectional side elevation of a hydraulic cylinder and its
connecting gear.
In this case I have shown what I have found to be a convenient arrangement of
such apparatus partly sunk below the level of the floor x-but it will be obvious that
the cylinder may be arranged in any other suitable manner.
The upper part of the piston rod or ram a is firmly secured to the frame 6 of the
chair or couch the operator opens the inlet valve c by turning or pressing the plate or
lever d with his foot and so the chair or couch is raised and can be lowered again by
pressing or turning another lever or plate such as d which opens an outlet valve of

page_text: Instead of being vertical as shown in the Drawing the cylinder may be mounted in
a sloping direction so that the line of travel of the chair or couch actuated will be an
inclined plane.
Further it will be obvious that the head of the piston rod or ram may be connected
to the seat or bottom only of the chair or couch or to any other part separately as
desired so as to actuate such separate part only.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is,
1. The use and application of hydraulic power (i.e. water and other fluids under
pressure) to actuate dentists' and the like chairs or couches.
2. The improved method of actuating dentists' and the like chairs or couches by
means of hydraulic power (i.e. water or other fluids under pressure) substantially
in the manner and for the purposes hereinbefore described and illustrated in the
drawing hereunto annexed.