Year: 1886

page_text: Date of Application, 28th Dec., 1886.
Specification Accepted, 28th Jan., 1887.
I, OLE FLAGSTAD, Manufacturer, resident of the town of Hamar in the Kingdom of
Norway Strandgaden 24, 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 :-
According to this invention I provide the window sashes with pivots which can slide
in grooves in the window frame, the sashes being hinged together in the middle of the
window all as hereinafter described.
In the accompanying drawings Figure 1 is a plan section of a window construction
according to my invention and Figure 2 a part plan section of another window con-
struction, the windows being shewn in partly open positions. Figure 3 is a vertical
section showing the windows in the closed position. Figures 4 and 5 are details of
appliances for closing the windows.
The sashes which may be of ordinary form are as shown in Figures 1, 2 and 3
movable in grooves which are provided in the top and bottom of the window frame.
For this purpose the sashes are at top and bottom provided with pivots h which are
fixed in sliding blocks g that can glide in the said grooves r. To prevent formation
of ice in these grooves or to remove same when formed the sashes are on each side
provided with noses or scrapers P, p¹. In order to enable the sashes to be removed
there are loose pieces a, a, dovetailed into the window frame, and when these pieces
are lifted out the blocks y are free and the window sashes loose.
The sashes are connected in the middle by some kind of hinges, and when these
latter are carried outward the window opens the other or outer sides of the sashes then
sliding in the window frame and approaching each other more or less as desired. The
hinges may be of any suitable construction and I do not bind myself to any one in
particular, wherefore the forms here shown are merely examples. In the form of
hinge shown in Figure 1 the hinges consist of several hinge brackets b which are
connected by a round through rod c or a rod in two lengths. This rod may further
in some known suitable manner be made to serve as means for fixing the window in
the closed position, being guided or moved by a handle c' which may have an appliance
such as a tumbler pinion or the like whereby the upper end of the two parted rod c is
shot into a hole in the top of the window frame and the lower end into a hole d in the

page_text: bottom of the window frame. Or the rod c when in one piece may be fixed to the
window frame by turning the handle c¹ whereby a hook fixed on the rod catches
against a peg d' on the window frame.
The hinge connection in the middle may also be by ordinary hinges or as shown in
Figures 2 and 3 by means of several small hinge brackets 6 with pins c and not with a
through rod. In both these latter cases the window may be made without or with
a middle post. In the latter case the fastening of the shut window is effected by a
hook of the shape shown in Figure 3 and which is hung on the sash frame by a
staple m; this hook k is squeezed in between the two pegs n fixed on the middle post;
see also Figure 2, where this hook is shown applied to hold the sashes in a slightly
open position for airing the room and with safety when there are small children in
same the hook is hooked onto the small holdfast o on the middle post and is kept
fixed by a spring 1, so that a child cannot easily open it. Figures 4 and 5 also shew
these details. The fixing may however if desired be done by ordinary hooks.
The hinge connections may also be detachable so that the sashes can turn indepen-
dently each on its pivots.
Obviously the window sashes may be so arranged that the sliding blocks g move
vertically the hinge or hinges then being horizontal. This arrangement has the
advantage of giving a whole clear window opening.
I shall now name some advantages of my invention.
1. The windows can be fixed securely in any position.
2. The panes can when the windows are open be cleaned on both sides from within
the room.
3. The window sashes may at will be set open in the middle or to one side in the
window opening.
4. The window sashes are firmer in their open position than ordinary hinged
windows and are not therefore so easily damaged by the wind.
5. The sashes may nevertheless with the greatest ease be opened and closed even
though they fit well in the window frame, so that these windows can be fitted quite
tight.
6. These windows when made with middle post- may be opened without danger to
children.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed I declare that what I claim is :-
First Connecting window sashes which turn on pivots that run in grooves in the
window frame by means of hinge appliances in the middle substantially as set forth.
Second-The constructions of centrally hinged window sashes with pivots running
in grooves in the window frame substantially as described with reference to the
accompanying drawings.
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