An Improved Automatic Sash Fastener.
Year: 1889

page_text: Date of Application, 23rd Mar., 1889
Complete Specification Left, 14th Dec., 1889-Accented, 18th Jan.. 1890
PROVISIONAL, SPECIFICATION.
An Improved Automatic Sash Fastener.
1, ROBERT HENRY BLYTH, of High Street, Moffat, in the County of Dumfries,
North Britain, Gentleman, do hereby declare the nature of this invention to be as
follows:-
This invention relates to an improved automatic sash fastener, by the use of which
the window can be closed and locked by one operation, and can only be unlocked or
released from the interior.
On to the top bar of the lower sash of the window frame, a fixed horizontal bar is
secured by suitable means, and on the bottom bar of the upper sash two upright
pillars are similarly secured. These pillars are so situated that the beforementioned
horizontal bar on the lower sash can drop between them on the window being closed.
Each pillar is provided with a vertical slot extending throughout the length thereof,
These levers
in which slots two balanced levers are pivotted upon suitable centres.
are provided with hooked shape projections on the face thereof which projections are
caused to lock the fixed bar in position on the window being shut down.
The action of the apparatus is as follows:-To open the window from the interior,
the upper extremities of the two balanced levers are pressed towards the centre of the
space between the before mentioned pillars, which action releases the hooked shaped
projections and allows the fixed bar on the lower sash to pass in an upward direction
thereby allowing the window to be opened in an easy and convenient manner.
To close the same and lock the fastener, it is only necessary to shut the window.
This action causes the fixed bar to pass between the vertical pillars, and come into
contact with the balanced levers which are turned upon their pivots the upper part of each
balanced lever being curved or rounded so as to allow the horizontal bar to pass easily
thereover. When the horizontal bai has passed beneath the balanced levers they fall by
their own weight into their normal position, the hooked shaped projections firmly
locking the fixed bar in position.
To prevent house breakers and others from attempting to enter a window from
outside two plates are provided, to which plates the upright pillars and fixed bar may
be attached. One edge of each of these plates is rabbetted so that should there be
any space between the sash frames when the window is closed, the rabbetted edges
of the plates being lapped over one another effectually prevents the insertion of a
wire, knife or other article and thereby affords secure protection against the opening
of the window from the outside.
1000
"
CASTLE SMITH,
Per F. W. Golby,
Invention" Office, 54, Fleet Street, London, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improved Automatic Sash Fastener.
I, ROBERT HENRY BLYTH, of High Street, Moffat, in the County of Dumfries,
Gentleman, 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 :—
This invention relates to an improved automatic sash fastener by the use of which
the window frame to which it is fitted can be closed and locked by one operation and
can only be unlocked or released from the interior.
The invention and the means of carrying the same into practice will be well under-
stood by referring to the accompanying drawings which are furnished in illustration

page_text: thereof, similar letters of reference being used to indicate the same or corresponding
parts in all the Figures.
Figure 1 is a sectional elevation taken on the line A B Figure 2; Figure 2 is a plan
of part of the meeting rails of a window frame fitted with my invention and shewing
the positions of the various parts when the window is closed; Figure 3 is a side
elevation taken at right angles to the line A B Figure 2; and Figure 4 is a perspective
view of one of the vertical standards C.
On the top rail G of the lower sash is affixed a horizontal bar D. This bar may be
affixed to the said top rail directly, but it is preferably formed in one with, or soldered,
brazed, rivetted or otherwise rigidly affixed to a base plate E, which is itself firmly
secured to the rail by screws For by other suitable means. On the bottom rail H of
the upper sash two vertical standards Care affixed, or they may be firmly fixed to a
base plate secured to the rail H by screws or the like. If desired the front plate E
may be made to overlap the back plate J as shewn in Figures 2 and 3 to prevent
the insertion of a wire or the like through the meeting line of the two sashes, but
this forms no part of my invention. The standards are exact counterparts of
each other, so that the same description will answer for both. They are placed facing
each other as shewn in Figure 1, with just sufficient space between them to allow
the easy passage of the horizontal bar D. The standard C is provided with two
vertical cheeks K between which is a weighted lever L pivoted on a horizontal
pin P secured to the two cheeks K. Two other horizontal pins M and N are also
secured to the checks K and serve to limit the movement of the lever L. The said
lever Lis weighted in such a manner that normally its nose O projects in front of the
cheeks K as shewn by the full lines in Figure 1. It will be seen that any attempt to
open the window while the levers are in their normal position will cause the bar D
to bear against the flat under surface R of the lever. A shoulder S is formed on the
lever and this shoulder rests against the horizontal pin N, so that should any undue
force be applied, the pressure of the bar 1) on the lever I will be distributed between
the pin N and the pivot P, both of which are made very strong so as to resist great
pressure. The upper end Ŭ of the lever projects slightly above the cheeks K of the
standard C so that the projecting ends U of two levers L facing each other may be
taken between the finger and thumb and pressed together in the direction shewn by
the arrows in Figure 1, thus turning the levers on their pivots until they assume the
position indicated by dotted lines. Their noses O being now within the cheeks K, the
bar D is free to pass between the two standards ().
In closing the window frame the underside of the bar D which is curved or bevelled
at its edges as shewn in Figure 1, strikes against the upper curved parts of the
noses O, and continued pressure turns the levers on their pivots into the dotted
position shewn, the motion being limited by the stops M. The bar now having a
free passage passes down between the standards C and the weighted levers again by
the action of gravity resume their normal position.
It will be seen that the locking of the window frame is automatically effected by the
act of closing, and that the window frame is unlocked by simply pressing together
the upper ends U of the two levers L.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
An automatic sash fastener consisting of a horizontal bar D fixed on the lower sash
and passing between two weighted levers L carried in suitable bearings on standards C
fixed to the upper sash, constructed and operating substantially in the manner and for
the purpose hereinbefore described and illustrated in the accompanying drawings.
Dated this 14th day of December 1889.
«
CASTLE SMITH,
Per F. W. Golby,
Invention" Office, 54, Fleet Street, London, E.C., Agent for the Applicant.