IMPROVEMENTS IN SECURING AND ADJUSTING WINDOWS, BLINDS, AND SHADES, DOORS, AND SHUTTERS, AND IN THE APPARATUS EMPLOYED THEREFOR
Year: 1867

page_text: LETTERS PATENT to Robert Logan, of Glasgow, in the County of Lanark,
North Britain, for the Invention of "IMPROVEMENTS IN SECURING AND
ADJUSTING WINDOWS, BLINDS, AND SHADES, DOORS, AND SHUTTERS, AND IN THE
APPARATUS EMPLOYED THEREFOR."
Scaled the 3rd December 1867, and dated the 10th June 1867.
PROVISIONAL SPECIFICATION left by the said Robert Logan at the
Office of the Commissioners of Patents, with his Petition, on the
10th June 1867.
I, ROBERT LOGAN, of Glasgow, in the County of Lanark, North Britain,
do hereby declare the nature of the said Invention of "IMPROVEMENTS IN
SECURING AND ADJUSTING WINDOWS, BLINDS, AND SHADES, DOORS, AND SHUTTERS,
AND IN THE APPARATUS EMPLOYED THEREFOR," to be as follows, that is to
say-
This Invention relates to an arrangement or combination of mechanism
which is applied for the purpose of regulating the amount of opening of and
adjusting or fixing at a desired extent of opening sliding windows, Venetian
[Price 8d.]

page_text: blinds, or shades, and window shades, as well as doors and shutters, and it
consists in employing one or more racks having ratchet teeth on them, which
racks are attached to some convenient part of the framing. The moveable
part of the window blind, shade, shutter, or door has one or more ratchet
palls fixed to it, and which is or are acted upon by a spring, and by it forced
into the recesses of the teeth; the pall is connected by a link to one end of a
bell crank, the other end of the bell crank being attached to a lever which is
fastened into the framing, this lever being so formed that it serves for with-
drawing the pall or palls from the ratchet teeth, so that the part to which it
is fixed may be lowered; it also in combination with a fixed projection serves
the purpose of a thumb and finger piece, by which the window, blind, shade,
door, or shutter may be held for the purpose of raising or lowering. On
releasing the pressure of the thumb and finger from the lever the pall or palls
fall into one or more ratchet teeth, and the window, blind, shade, door, or
shutter becomes at once fixed in any position of opening desired. It may be
observed that this Invention is peculiarly applicable to the sliding windows of
railway carriages and steam vessels.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Robert Logan in the Great Seal Patent Office on the
9th December 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
LOGAN, of Glasgow, in the County of Lanark, North Britain, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Tenth day of June, in the year of our Lord One
thousand eight hundred and sixty-seven, in the thirtieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the
said Robert Logan, Her special license that I, the said Robert Logan, my
executors, administrators, and assigns, or such others as I, the said Robert
Logan, my executors, administrators, or 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
SECURING AND ADJUSTING WINDOWS. BLINDS, AND SHADES, DOORS, AND SHUTTERS,
AND IN THE APPARATUS EMPLOYED THEREFOR," upon the condition (amongst

page_text: others) that I, the said Robert Logan, by an instrument in writing under
my hand and seal, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be performed,
and cause the same 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 Robert Logan, 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 accompanying Drawings, and to the
letters and figures marked thereon, that is to say:-
My said Invention relates to an arrangement or combination of mechanism
which is applied for the purpose of regulating the amount of opening of and
adjusting or fixing at any desired extent of openingsliding windows, Venetian
blinds, or shades, and window shades, as well as doors and shutters, and it
consists in employing one or more racks having ratchet teeth on them, which
racks are attached to some convenient part of the framing. The moveable
part of the window, blind, shade, shutter or door, have one or more ratchet
palls fixed to it, and which is or are acted upon by a spring, and by it forced
into the recesses of the teeth; the pali is connected by a link to one end of a
bell crank, the other end of the bell crank being attached to a lever which is
fastened into the framing, this lever being so formed that it serves for with-
drawing the pall or palls from the ratchet teeth, so that the part to which it is
fixed may be lowered; it also in combination with a fixed projection serves the
purpose of a thumb and finger piece, by which the window, blind, shade, door,
or shutter may be held for the purpose of raising or lowering. On releasing
the pressure of the thumb and finger from the lever the pall or palls fall into
ore or more ratchet teeth, and the window, blind, shade, door, or shutter
becomes at once fixed in any position of opening desired. It may be observed
that this Invention is particularly applicable to the sliding windows of railway
carriages and steam vessels.
And in order that my said Invention may be properly understood I now
proceed more particularly to set forth the system, mode, or manner in or
under which the same is or may be used or practically carried into effect,
reference being had to the explanatory Sheet of Drawings, and to the letters
and figures marked thereon, which I have hereunto appended, that is
to say
Figure 1 is a sectional elevation, Figure 2 a sectional plan, and Figure 3 a

page_text: vertical transverse section showing the arrangement of mechanism applied to
a railway carriage window.
A is a toothed rack fixed by screws to door frames B; C is a bolt or pall
carried in the brackets D. The bolt or pall is forced into the rack by the
spiral spring E; Fis a bell crank worked by a lever L attached to the thumb
plate M, details of which are represented in Figures 4, 5, 8, 9, 10, and 11,
the same letters of reference indicating corresponding parts; G is a bracket
screwed to the inside of the window having a finger plate H on one side of the
window, and on the other side a pin I, which serves as a fulcrum to the bell
crank F.
Figure 6 is another mode of arranging the mechanism. A is a rack
screwed to the door frame; C, a pall hinged to the plate B, which is screwed
to the edge of the window frame; D, a spring placed behind the pall B to
force it into the teeth of the rack A; E is a wire connecting the pall Bto the
crank F.
Another construction is shown in Figures 7 and S. In Figure 7 the rack A
is fixed to the door frame. C is a pall hinged on a frame B; to the top end
of the pall a rod E is fixed for releiving the toe of the pall from the rack,
and D is a spring for returning the pall into the rack. Figure 8 is a front
elevation of the frame B and the pall C.
The mode of working the arrangement is as follows:-When it is desired
to lower the window the thumb plate M is pressed down to the finger
plate H, the pin or lever L turns the bell crank F, and the bolt or pall C is
withdrawn from the rack A; the window is then lowered to the desired
distance and the thumb plate M is relieved; the bolt C is immediately pushed
out into the teeth of the rack by the spiral spring E, and the window is
secure. In Figure 6 the mode of operating is the same, the pall C being
pushed into the rack by the spring D. In Figure 7 the pall C is disengaged
from the rack A by being pushed forward at the top end by the rod E, the
spring D returning the toc of the pall C into the rack A when the thumb
plate is released.
Having now described the nature of my said Invention, and the manner
in or under which the same is or may be used or practically carried into
effect, I would observe, in conclusion, that what I consider novel and original,
and therefore claim as the Invention secured to me by the herein-before in
part recited Letters Patent is,-
First, the general arrangement and combination of parts constituting the
apparatus, as herein-before described, or any inere modification thereof,

page_text: Second, the application of ratchets and palls for securing the windows of
railway carriages and other similar structures, as well as to blinds,shades,and
ordinary windows.
In witness whereof, I, the said Robert Logan, have hereunto set my
hand and seal, this Sixth day of December, One thousand eight
hundred and sixty-seven.
Witness,
ST. JOHN VINCENT DAY, C.E.,
166, Buchanan Street,
Glasgow.
ROBT. LOGAN. (L.S.)