IMPROVEMENTS IN THE CONSTRUCTION OF BOW OR PROJECTING WINDOWS
Year: 1870

page_text: LETTERS PATENT to Joseph Perrett, the younger, of Clifton, in the
County of Gloucester, Engineer, for the Invention of "IMPROVEMENTS
IN THE CONSTRUCTION OF BOW OR PROJECTING WINDOWS."
Sealed the 16th May 1871, and dated the 25th November 1870.
PROVISIONAL SPECIFICATION left by the said Joseph Perrett at the
Office of the Commissioners of Patents, with his Petition, on the
25th November 1870.
I, JOSEPH PERRETT, the younger, of Clifton, in the County of Glou-
cester, Engineer, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF BOW OR PROJECTING WINDOWS," to
be as follows :—
This Invention relates to a novel construction of bow window suitable
for ground floors and for verandahs, which window will admit of being
opened centrally or of being pushed back into the room and closing
inwards. The window may be made either of one frame or of two or
more segment frames fitted together. The bow window will in general

page_text: take a semicircular form, and in constructing it, say for a balcony,
I provide two circular guides or rails, one for the top and the other for
the bottom of the window. The window will, in general, be composed
of detached segment frames of metal or wood extending each from the
lower guide ring to the upper guide ring, and the sides of these frames 5
I form with rebates and tongues, so that they may interlock and mako
tight joints. The guide rings may be semicircular in cross section, or
of any other desired form, and the frames may be provided with anti-
friction rollers to run upon the guide rings. In opening a window of
this construction to the full one half will be drawn inwards to the right, 1
and the other to the left, and thus free space will be opened to the
balcony nearly equal to the width of the wall aperture.
When forming a bow window with a dome top, instead of having an
upper guide ring I provide a centre pin around which the frame or
frames of the window may turn. The semicircular frame in this case 1
may be a single structure or composed of segments as described above,
and it may be provided with antifriction rollers to run round the centre
pin. Or the converging bars of the frame when made of segments may
be forked to fit one into the other and receive the centre pin.
The advantage of my improved bow window is that the segments can 2
be all thrown back, leaving a circular space for a party to sit in the
open air, the adjacent room being at the samo time closed against the
external atmosphere and free from all draught; or, the window may be
partially opened on each side leaving a central passage for the air, or
it may be opened on one side only, thereby effectually cutting off the 2
rough wind and at the same time letting air into the room, or in mild
weather catching the whole of the breeze, according as the window is
turned.
MI
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Joseph Perrett in the Great Seal Patent Office on
the 25th May 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOSEPH¨
PERRETT, the younger, of Clifton, in the County of Gloucester, Engincer, 3
send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fifth day of November, in the
year of our Lord One thousand eight hundred and seventy, in the thirty-
fourth year of Her reign, did, for Herself, Her heirs and successors, givo
and grant unto I, the said Joseph Perrett, the younger, Her special
licence that I, the said Joseph Perrett, the younger, my executors,
administrators, and assigns, or such others as I, the said Joseph Perrett,
the younger, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN THE CONSTRUCTION OF BOW OR PROJECTING WINDOWS,"
upon the condition (amongst others) that I, the said Joseph Perrett,
the younger, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the samo to
be filed in the Great Seal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Joseph Perrett, the younger, do
hereby declare the nature of my said Invention, and in what manner
the same is to be performed, to be particularly described and ascertained
in and by the following statement, reference being had to the Drawing
hereunto annexed and to the letters and figures marked thereon (that is
to say) :-
This Invention relates to a novel construction of bow window suitable
for ground floors and for verandahs, which window will admit of being
opened centrally or of being pushed back into the room and closing
inwards. The window may be made either of one, frame, or of two or
moro segment frames fitted together.
.
In the accompanying Drawing I have shewn my Invention under
several forms to suit varying requirements. The bow window will, in
general, take a semicircular form, and in constructing it, say for a
balcony, I provide two circular guides or rails, one for the top, and the
other for the bottom of the window. The windows will, in general, be
composed of detached segment frames of metal or wood extending cach
:
'

page_text: from the lower guide ring to the upper guide ring, and the sides of
these frames I form with rebates and tongues, so that they may interlock
and make tight joints. This arrangement is shewn in side elevation in
Fig. 1, and in front elevation in Fig. 2; and Figures 3 and 4 are
sectional plan views of the same, the one shewing the window closed |
and the other showing the window open. This window consists of two
glazed segment frames A, A, with rebated contact edges and supported
These segment
at top and bottom by means of annular guides B.
frames, it will be seen by reference to Fig. 3, form together a semi-
circular window. The lower ring guide B rests one half on the
balcony O, and the other half on the wall and floor D of the apartment
to which the window is applied. The upper ring guide is made fast to
the under side of a kind of canopy roof carried by the wall of the
building and extending one half beyond the wall face and the other half
within the building. The guide rings B, B, may be semicircular in
cross section, as shown in the enlarged view Fig. 5, -‹ or of any other
desired form, and the frames may be provided with anti-friction rollers a
to run upon the guide rings. Figs. 5ª shew the rebated edges of the
frames on an enlarged scale. In opening a window of this construction
to the full one half may be drawn inwards to the right and the other
to the left, as shewn at Fig. 4, and thus a free space will be opened to
the balcony nearly equal to the width of the wall aperture.
When forming a bow window with a dome top, instead of having an
upper guide ring, I provide a centre pin around which the frame or
frames of the window may turn. The semicircular frame in this case!
may be a single structure or composed of segments as described above,
and it may be provided with anti-friction rollers to turn round the
centre pin. This arrangement of window is shown in front view at Fig. 6,
in side view at Fig. 7, and in plan or top view at Fig. 8. In this case
the frames are shewn as glazed from the bottom to the top, and the
window is represented as composed of four rebated segment frames. At
bottom they are supported upon a guide ring, as illustrated at Fig. 5,
and with or without the aid of anti-friction rollers; and at top they are
supported by a central axle or pin, shewn best in the largo detached
views Figures 9 and 10, which represent the upper part of the segment
frames and their attachments in sectional elevation and in plan view.
E is a pendent axle or centre pin made fast to the front wall, and

page_text: around it are arranged the dome-shaped terminations of the segment
frames A, each frame carrying at its upper end one or more anti-friction
rollers a. Above these rollers is placed a metal cap piece F, which is
made fast to the centre pin E, and by overlapping the rollers serves to
retain the frames in position.
Figures 11 and 12 show a slight modification of this arrangement, in
which a cap piece F serves not only to retain the converging segment
frames in position, but acts also as the centre around which they move.
In this case an annular groove is formed in the cap piece to receive the
anti-friction rollers and the cap is made fast to the building.
Fig. 13 shows an arrangement in which the upper anti-friction rollers
are not required. In this case the converging bars of the segment
frames are forked to fit one into the other and receive the centre pin E,
around which they are free to turn either altogether or independently..
The advantage of my improved bow window is that the segments can
be all thrown back leaving a circular space for a party to sit in the
open air, the adjacent room being at the same time closed against the
external atmosphere and free from all draughts. This is illustrated in
Figures 14 and 15, Fig. 14 shewing in elevation and Fig. 15 in sectional
plan, the bow window of Figures 1 and 2 inverted in position (that is
to say), the window is closed inwards instead of outwards and a free
space is left externally of the window for a party to enjoy the open air.
Or, the window may be partially opened on each side leaving a central
passage for the air, as shewn at Fig. 4. Or, it may be opened on one
side only, as shewn at Fig. 8, thereby effectually cutting off the rough
wind and at the same time letting air into the room, or in mild weather
catching the whole of the breeze according as the window is turned.
.
The window instead of forming half a circle may be a quarter or any
other part of a circle, and it may be fastened by means of screws, as
shown at b, Fig. 16.
Having now set forth the nature of my "Improvements in the
Construction of Bow or Projecting Windows," and explained the manner
of carrying the same into effect, I wish it to be understood that under
the above in part recited Letters Patent I claim, constructing bow

page_text: windows of segment-shaped frames capable of moving upon or around a
central vertical axis in the manner and for the purpose above described.
In witness whereof, I, the said Joseph Perrett, the younger, have
hereunto set my hand and seal, the Twenty-fourth day of May,
in the year of our Lord One thousand eight hundred and seventy-
onc.