IMPROVEMENTS IN WINDOW SASH FASTENINGS
Year: 1853

page_text: LETTERS PATENT to Christopher Garman Rosenkilde, of Christian-
sand, Norway, Merchant, for the Invention of "IMPROVEMENTS IN
WINDOW SASH FASTENINGS."
Sealed the 29th September 1853, and dated the 2nd April 1853.
PROVISIONAL SPECIFICATION left by the said Christopher Garman
Rosenkilde at the Office of the Commissioners of Patents, with
his Petition, on the 2nd April 1853.
I, CHRISTOPHER GARMAN ROSENKILDE, of Christiansand, Norway,
Merchant, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN WINDOW SASH FASTENINGS" to be as follows: -
My Invention consists of a spring which is fitted into a recess made
in the edge of the style of the sash; the free end of the spring takes
into a catch formed in the window frame, by which the sash is in-
moveably fixed until the projecting piece is pressed or lifted out of the
catch, for which purpose the end of the spring projects a small distance.
beyond the surface of the sash frame, so that, by applying the finger to .
that projection, the sash frame is thereby moved either up or down, as
the case may be.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Christopher Garman Rosenkilde, in the Great
Seal Patent Office, on the 1st October 1853.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
CHRISTOPHER GARMAN ROSENKILDE, of Christiansand, Norway, Merchant,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of April, in the year
of our Lord One thousand eight hundred and fifty-three, in the
sixteenth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Christopher Garman Rosenkilde,
Her special licence that I, the said Christopher Garman Rosenkilde,
my executors, administrators, and assigns, or such others as I, the said
Christopher Garman Rosenkilde, 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 WINDOW SASH
FASTENINGS," upon the condition (amongst others) that I, the said
Christopher Garman Rosenkilde, 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 Christopher Garman Rosenkilde,
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 thereof, reference being
had to the drawings hereunto annexed, that is to say:
"
My Invention consists of an improved spring fastening for window
sashes, whereby the use of the weights, lines, and pulleys ordinarily
employed for raising the same, and the fastenings for securing the same
when closed, may be dispensed with. My improved fastening consists

page_text: of a spring which is fitted into and fixed at one end in a recess made in
the edge of the style of the sash, or in the window frame against which
the sash slides; the free end of the spring is furnished with a projecting
piece or knob, and takes into a notch formed in the window frame or
in the style of the sash, by which the sash is immoveably fixed until the
projecting piece is pressed or lifted out of the notch, when the sash may
be moved up or down as may be required.
Figure 1, of the drawings annexed is an elevation, partly in section,
of a window sash and frame fitted with my improved spring fastening;
and Figure 2, a plan of the fastening detached. A, is the window
frame; B, the style of the sash; C, the spring fastening, which is fixed
at one end by screws to the window frame in the recess D; E, is the
projecting piece or knob at the free end of the spring; and F, a notch
formed in the style of the sash, into which the free end of the spring C,
takes; G, is a friction roller mounted at this end of the spring to
facilitate the movement of the sash past it. There may be several
notches, similar to F, formed in the style of the sash, in order to hold it
at different heights as required. Instead of the spring fastening being
fixed to the window frame, as before described, it may be attached to
the sash, and the notches would then be formed in the window frame.
The drawing shews the fastening as applied only to the lower sash, but
where the upper sash of a window is also required to open, a similar
spring may be attached to that sash.
And having now described the nature of my said Invention, and
in what manner the same is to be performed, I declare that what 1
claim is,
The spring fastening for window sashes represented in the drawings
and herein-before described.
In witness whereof, I, the said Christopher Garman Rosenkilde,
have hereunto set my hand and seal, this First day of October,
One thousand eight hundred and fifty-three
CHRISTOPHER G. ROSENKILDE. (L.S.)