Improvements in Adjustable Footboards for Dental and other Chairs.
Year: 1895

page_text: Date of Application, 22nd June, 1895
Complete Specification Left, 21st Mar., 1896-Accepted, 25th Apr., 1898
PROVISIONAL SPECIFICATION.
Improvements in Adjustable Footboards for Dental and other
Chairs.
We, THOMAS HARRY GARDNER, and EDWARD GARDNER, both of Cornbrook,
Manchester, Engineers, do hereby declare the nature of this invention to be as
follows:-
According to this invention a swinging frame is pivotted to the upper part of the
front portion of the two sides of the frame of a chair. The swinging frame hangs
downwards and to its lower end two side arms are pivotted to which are fixed the
footboards-one footboard that nearest to the seat a horizontal one the other at
the extremity of the side arms inclining upwards.
On the underside of each side arm are a series of notches ranged in the arc of a
circle corresponding to the arc described by the lower end of the swinging frame
but inverted that is it inclines downwards as the arc described by the swinging
frame inclines upwards.
A rigidly fixed bar is made to extend from the lower part of the front of one
side of the chair frame to the other. This portion of the chair frame extends
forwards beyond the other parts of the frame so that the fixed bar which passes
across from one side of the frame to the other is some distance in front of the
pivots upon which the swinging frame swings.
The side arms jointed to the swinging frame rest on the bar and the bar enters
one or other of the notches on their under sides. The form of the notches is such
that when the bar lies in them the arms and footboards carried by the arms cannot
move forwards away from the seat. The notches are all made parallel with one
another so that in whatever position the footboards are placed the notches in the
side arms which carry them always engage with the bar in the same way.
raised until the
If the front end of the side arms carrying the footboards
notches in their under side are disengaged from the bar the arms and footboards
can be drawn forwards or pushed back as required and be then again lowered so
that other notches in the arms then engage with the bar.
The inclined footboard can thus be set nearer to or further away from the seat
and as the inclined footboard is brought nearer to the seat the horizontal footboard
is simultaneously raised.
P
1005
T. H. GARDNER.
EDWARD GARDNER.
Improvements in Adjustable Footboards for Dental and other
Chairs.
We, THOMAS HARRY GARDNER, and EDWARD GARDNER, both of Cornbrook,
Manchester, Engineers, 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:-
According to this invention a swinging frame is pivotted to the upper part of the

page_text: front portion of the two sides of the frame of a chair. The swinging frame hangs
downwards and to its lower end two side arms are pivotted to which are fixed the
footboards-one footboard, that nearest to the seat a horizontal one the other at the
extremity of the side arms inclining upwards.
On the underside of each side arm is a series of notches ranged in the arc of a
circle corresponding to the are described by the lower end of the swinging frame,
but inverted that is, it inclines downwards as the arc described by the swinging
frame inclines upwards.
A rigidly fixed bar is made to extend
side of the chair frame to the other.
forwards beyond the other parts of the
across from one side of the frame to the
upon which the swinging frame swings.
The side arms jointed to the swinging frame rest on the bar and the bar enters
one or other of the notches on their under sides. The form of the notches is such
that when the bar lies in them the arms and footboard carried by the arms cannot
move forwards away from the seat. The notches are all made parallel with one
another so that in whatever position the footboards are placed the notches in the
side arms which carry them always engage with the bar in the same way.
from the lower part of the front of one
This portion of the chair frame extends
frame so that the fixed bar which passes
other is some distance in front of the pivots
If the front end of the side arms carrying the footboards is raised until the
notches in their under side are disengaged from the har the arms and footboards
can be drawn forwards or pushed back as required and be then again lowered so
that other notches in the arms then engage with the bar.
The inclined footboard can thus be set nearer to or further away from the seat
and as the inclined footboard is brought nearer to the seat the horizontal footboard
is simultaneously raised.
Figure 1 is a side elevation of the chair with the footboard in its most extended
position.
Figure 2 is a similar side elevation with the footboard drawn in and raised.
Figure 3 is a section taken through the line a b Figure 2.
The two portions J and K of the footboard are secured to side arms F-one
footboard Ja horizontal one, the other K inclining upwards. The side arms Fat
one end are pivotted to a swinging frame D which is pivotted at C to the front
portion of the two sides of the frame A of the chair.
GG are a series of approximately vertical notches in the under side of the
arms F-the notches are ranged in the arc of a circle corresponding approximately
to the are described by the lower end of the swinging frame D but inverted, that
is, it inclines downwards as the arc described by the swinging frame inclines
upwards. His a fixed bar extending across from the lower part of the front of
one side of the chair frame to the other. This portion of the chair extends
forwards to some distance in front of the seat B so that the bar H is some distance
in front of the pivots upon which the frame D swings. The side arms F rest on
the bar H and the bar enters one or other of the notches G on their under sides.
The form of the notches is such that when the bar H lies in them the arms and
footboards carried by the arms cannot move forwards away from or backwards
towards the seat. The notches are all made parallel with one another so that in
whatever position the footboards are placed the notches always engage with the
bar H in the same way.
If the front end of the arins F is raised until the notches G are disengaged from
the bar H the arms and footboards can be drawn forwards or pushed back as
required and be then again lowered so that other notches in the arms then again
engage with the bar but so long as the bar H is in one or other of the notches all
the parts are securely locked. The inclined footboard K cau thus be set nearer to
or farther away from the seat and as the inclined footboard is brought nearer to
the seat the horizontal footboard is simultaneously raised and whether raised of
lowered is always held approximately in a horizontal position and held securely.

page_text: 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. The combination with a chair frame of a swinging frame D jointed to the
upper part of the front portion of its two sides-the bars F carrying footboards
jointed to the lower end of the swinging frame and having upright notches on their
underside ranged in the arc of a circle corresponding approximately to the arc
described by the lower end of the swinging frame but inverted, that is, inclining
downwards, as the other inclines upwards and the bar H fixed across the lower
part of the front portion of the chair frame to engage with one or other of the
notches in each bar F and lock the footboards in any position into which they may
be placed.
'
2. The construction of adjustable foot boards for dental and other chairs
substantially as herein before described and illustrated in the drawing annexed.
Dated this 10th day of March 1896.
T. H. GARDNER.
EDWARD GARDNER.