IMPROVEMENTS IN WINDOW FASTENERS
Year: 1879

page_text: LETTERS PATENT to Claude Edward Gibson, of Birmingham, in the County
of Warwick, for the Invention of "IMPROVEMENTS IN WINDOW FASTENERS."
Sealed the 4th June 1880, and dated the 9th December 1879.
PROVISIONAL SPECIFICATION left by the said Claude Edward Gibson at
the Office of the Commissioners of Patents on the 9th December 1879.
CLAUDE EDWARD GIBSON, of Birmingham, in the County of Warwick.
"IMPROVEMENTS IN WINDOW FASTENERS.'
My Invention relates to window fasteners having a radial arm working upon a
pin or pivot on the outer or upper sash which, when drawn over the inner sash,
prevents either the outer sash being drawn down or the inner one from being
lifted up. These ordinary window fasteners do not however either draw the sashes
together or prevent the withdrawal of the radial arm by passing a knife or other
thin instrument between the sashes from the outside, and thus they neither secure
the sashes from shaking nor are they safe fasteners.
By my Invention the two sashes are pressed together sufficiently to prevent
the entrance of dust or draft, and the fastener cannot be withdrawn from the
outside.
In the simplest form of my fastener I divide the radial arm near the pivot.
The hand end of the arm I cast in thin brass with five sides which are afterwards
bent over into the form of a hollow rectangle or oblong shape. In the pivot end
of the arm I cast a square or oblong iron rod which is securely fastened in the
metal by contraction. I then place on this square rod a washer followed by a
spiral spring and another washer, over which I bring the hollow handle portion of
the arm securing the first named washer at its outer end, thus encasing the spring
which has a constant tendency to pull the knob towards the pivot.
The quadrant
staple on the inner sash has a notch into which the arm springs when turned into
position, and the spiral spring is sufficiently strong and has sufficient range in length
to keep the sashes well together. The pivot end of the arm is provided with pro-
jections to cover the joint of the arm, and to keep any instrument from opening the
fastening from the outside.
A very cheap and effective form would also be to cast a round piece of iron in
the pivot to receive a circular spring and a corresponding round hole in the arm,
in which case I should make the outside of the arm, whether square, flat, or other
suitable form, to slide into a suitable socket formed at the pivot boss outside the
round iron arm; this socket would be an effective guide to the arm to keep it
from turning round, and an effective preventive against being opened from the
outside.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Claude Edward Gibson in the Great Seal Patent Office on the 7th
June 1880.
CLAUDE EDWARD GIBSON, of Birmingham, in the County of Warwick.
"IMPROVEMENTS IN WINDOW FASTENERS."
In the simplest form of my fastener, as illustrated by Figures 1 and 2, I divide
the radial arm A near the pivot, which will be best seen by the section Figure 3.
The hand end of the arm A. I cast in brass with five sides as shown in section,
Figure 4, and which are afterwards bent over into the form of a hollow rectangle
or oblong shape, as shown by Figure 5 in section. In the pivot end of the arm b,
Figures 10 and 3, I cast a square or oblong iron rod c, which is securely fastened in
the metal by contraction. I then place on this square rod a washer & followed by
the springe and another washer f, which is secured by rivetting over the end of
the rod d. I then bring over the hollow handle portion of the arm g, Figure 3, or as
shewn also by Figure 5, to which I secure the first named washer & by turning the
two projection pieces h, Figure 6, behind the back of the said washer d, and thus
the spring is increased.
This spring being in tension has a constant tendency to pull the knob across
towards the pivot. The quadrant staple J on the inner sash is provided with a
notch K into which the arm springs, takes when turned into the position of Figure 1 ;
indeed when the arm has passed the joint 7 on the quadrant the incline from the
point towards the notch K combined with the action of the spiral spring in the
arm and the straight spring m acting upon the little pulley n has the effect of
bringing the arm over into the notch k, which makes it nearly impossible for the
window to be partly fastened only. The strength of the spiral spring in the
leg is also quite sufficient to draw the two sashes together and to hold them close.
The pivot end b of the arin A is provided with projections 0, 0, to cover the joint
of the arm, and to prevent any instrument from opening the fastening from the
outside.
A very good modification would be to cast a round piece of iron in the pivot end
b, Figures 7 and 8, to receive a round spring, and a corresponding round hole in the
arm, in which case the outside end of the arm whatever shape it may be desired to
make it would slide into the socket p formed at the pivot boss; the boss would be
an effective guide to keep the arm from twisting round, and an effective preventative
against being opened from the outside. The block sliding in the slot has the
effect of keeping the arm in Figures 1 and 2 from turning round.
Sometimes I make the arm from a three sided piece of metal shewn by Figure 9,
which is afterwards bent into the shape of Figure 6. The projections 8, 8, are for
the purpose of strengthening that part of the leg when the ends h, h, are bent behind
the washer d.
Having now described my Invention I would have it understood that I claim as
my Invention the window fasteners herein described and illustrated on the accom-
panying Sheet of Drawings.
In witness whereof, I, the said Claude Edward Gibson, have hereunto set my
hand and seal, this Fifth day of June, in the year of our Lord One thousand
eight hundred.
Witness,
GEORGE BARKER.
CLAUDE EDWARD GIBSON. (L.S.)