Improvements in Excentric and Revolving Chairs for Ships' Saloons.
Year: 1891

page_text: Date of Application, 15th Jan., 1891
Complete Specification Left, 15th Oct., 1891-Accepted, 21st Nov., 1891.
PROVISIONAL SPECIFICATION.
Improvements in Excentric and Revolving Chairs for Ships'
Saloons.
I, ALEXANDER ROBERTSON of Danson Terrace, Carron in the County of
Stirling, Engineer, do hereby declare the nature of this invention to be as.
follows:-
This invention relates to chairs or seats of the kind placed around ships' saloon
tables and having their supports fixed to the floor and the object of the invention
is to provide a ship's saloon chair of stronger and at the same time lighter
construction than those at present in general use and possessing advantages not yet
introduced.
Under the invention the pedestal of the chair is made of sheet metal either in
one or more pieces stamped or drawn by means of dies or the like and fitted with a
top for fixing the chair proper. The top may either be a casting or made from
sheet, metal in the same manner as the pedestal and it is provided with apparatus
whereby the sitter can adjust the chair to and from the table as desired, the
mechanism having a simultaneous or independent and successive rotary and
reciprocating action.
The chair is locked in the desired position at any distance to or from the table
within the compass of the reciprocating traverse by means of a cam excentric or
incline plane, and for greater security against slip when the vessel is rolling.
heavily a rack or screw is or may be combined with the locking or rotating and
reciprocating mechanism.
Dated this Fourteenth day of January 1891.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Excentric and Revolving Chairs for Ships'
Saloons.
1, ALEXANDER ROBERTSON of Danson Terrace, Carron, in the County of
Stirling, Engineer, 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 chairs or seats of the kind placed around ships' saloon
tables and having their supports fixed to the floor and the object of the invention
is to provide a ship's saloon chair of stronger and at the same time lighter
construction than those at present in general use and possessing advantages not yet
introduced.
The invention is illustrated under several modifications on Sheets 1 and 2 of the
accompanying drawings, Figure 1 Sheet 1 being a vertical section on the line xx
Figure 2 which is a plan and Figure 3 a vertical section on the line - Figure 2
of one arrangement.
As seen by these figures the pedestal A of the chair is made of sheet metal
stamped or drawn by means of dies or the like to the required formation and it
may be made in one or in two or more pieces or sections secured or fastened.
together. The pedestal has fitted to its upper end a top B for carrying,
the chair. proper and which top may either be a casting as indicated_or

page_text: made from sheet metal in the same manner as the pedestal itself. The base C
of the chair seat is pivotted to the top B by a bolt D which has a T shaped
head passing through and resting upon the upper inclined surface of a wedge
piece E the latter being confined within a race or channel F made in the base C.
The hole in the wedge through which the bolt passes is slotted and the bottom of
the channel F is also open to permit the wedge piece E to rest upon the top B of
the pedestal in which a cam groove G is made a pin or stud H on the underside of
the wedge being entered into it. By this means the sitter is enabled to give to the
chair a simultaneous rotation and reciprocating action the chair being locked at the
desired distance to or from the table and within the limits of its reciprocating
traverse by the inclined top of the wedge E acting against the under side of the
head of the bolt D.
Figure 4 Sheet 1 illustrates in plan, Figure 5 in vertical section on the line st
and Figure 6 in vertical section on the line q-r an arrangement in which a rack I
and pawl J are substituted for the wedge or inclined plane.
The pawl which is confined between guides L is centred at its outer end on the
base C and at its inner end it gears with teeth made upon the piece M which is
carried in a slotted hole formed in the base C and confined in position by the
central pivot or bolt D the head of which has one side bevelled as shewn at D¹.
A pin H secured to the under side of the base C works in a slot or groove G
made in the top B of the pedestal and the contour of which is more particularly
seen in dotted lines at Figure 4. In the act of rotating the chair the inclined
part D' of the bolt raises the pawl free from the teeth of the piece M and further
rotative movement through the action of the pin F in the slot G causes the seat to
be reciprocated outwards or inwards from or to the table the pawl again locking
the chair in position when the adjustment has been effected.
Figure 1 Sheet 2 illustrates in plan and Figures 2 and 3 in cross section at right
angles to each other a modification of the last described arrangement and in which
upwardly projecting teeth N are formed upon each side of the cross bridge or
strap NI made in the base C of the seat. The bolt D is T-headed and has teeth
formed upon the ends of the T part to gear with the teeth N. The bolt or pivot D
passes through the gland which is maintained in permanent relative position with
the top B of the pedestal by the collar O screwed or otherwise secured to it and
bearing against the under side of the top.
To the underside of the top B there is secured by bolts P or otherwise a cam Q
and a relative cam face is made in the lower end of the bolt or pivot D which is
normally held downwards by a plate or other spring R carried by the gland K.
In turning the chair seat upon the bolt or pivot D the cam face of the bolt acting
upon the cam Q causes the bolt to rise and free the teeth on its T-head from the
teeth N whereafter the chair seat can be reciprocated away from or towards the
table, the slot in the base C enabling this to be done.
Figure 4 Sheet 2 shews in plan and Figure 5 in vertical section a locking
arrangement consisting of a series of teeth N made along one side of the gland K,
which is carried within a slotted hole made in the bridge or strap N' of the base C
and geared with similar teeth made upon a pawl J, which slides in guides upon the
upper side of the base C and is maintained in gear by the action of a coil spring R
one end of which abuts against a vertical heel made on the base and the other
against a shoulder S on the pawl. The head of the bolt D is excentric or cam
shaped so that in turning the seat of the chair the pawl J, is pushed back to free
its teeth from the teeth N after which the seat can be reciprocated as before
described.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The several combinations of parts constituting the revolving and reciprocating

page_text: chairs for ships' saloons substantially as described with reference to the drawings
hereunto annexed.
Dated this Fourteenth day of October 1891.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.