Improvements in Apparatus for Opening, Closing, and Fastening Windows and Ventilators.
Year: 1897

page_text: Date of Application, 26th Aug., 1897
Complete Specification Left, 14th May, 1898-Accepted, 2nd July, 1898
Improvements in Apparatus for Opening, Closing, and Fastening
Windows and Ventilators.
I, WILLIAM MCLAREN, of Moorgate Works, Moorfields, in the City of London,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in apparatus for opening and closing
windows and ventilators of the kind wherein the window sash or ventilator is
hinged along one side to the frame, and for fastening the same when closed.
According to my invention I pivot to the window or ventilator frame a lever
having a stud which engages in a slot in a plate fixed to the window sash or
ventilator so that by turning the lever on its pivot the projecting stud by its
movement in the slot in the plate opens and closes the window or ventilator
according to the direction in which the lever is moved.
With this construction of device I am enabled to tightly press the sash against
the frame and in order that the window or ventilator may be fastened when closed
one end of the slot is curved so as to provide a cam surface against which the
stud can be pressed by the lever.
It will be obvious that the stud may be fixed to the sash and the slotted plate
to the pivoted lever instead of as above described.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Apparatus for Opening, Closing, and Fastening
Windows and Ventilators.
I, WILLIAM MCLAREN, of Moorgate Works, Moorfields, in the City of London,
Manufacturer, 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 improvements in apparatus for opening and closing
and for fastening windows and ventilators of the kind wherein the window sash
or ventilator shutter is hinged along one side to the frame.
According to my invention I pivot to the window or ventilator frame a lever
having a stud which engages in a slot in a plate fixed to the window sash or
ventilator shutter so that by turning the lever on its pivot the projecting stud

page_text: by its movement in the slot in the plate opens and closes the window or ventilator
according to the direction in which the lever is moved.
With this construction of device I am enabled to tightly press the sash against
the frame and in order that the window or ventilator may be fastened when closed
one end of the slot is curved or inclined so as to provide a cam surface against
which the stud can be pressed by the lever.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which:-
Figure 1 is an elevation shewing the application of my improved device to a
ventilator of the kind such as is used in the roof of a railway carriage:
Figure 2 is a vertical section of the same:
Figure 3 is a section similar to Figure 2 but shewing the parts in a different
position.
a is the shutter of the ventilator and b is the frame in which the said shutter
is fitted the shutter being hinged to the ventilator frame in any suitable manner,
for instance as indicated at c in Figures 2 and 3.
d is the lever of my device which lever is formed as a bell-cranked lever and
is provided at one end with the finger piece or handle c and at the other end with
the pin the said lever being shown as pivoted upon a plate 9 which is secured to
the frame b.
is the plate in which the slot i is formed and which is secured to the
shutter a the said slot i having projecting into it the pin f on the lever d. The
said slot is arranged in such relation to the pin f of the lever d that when the said
lever is in the position shewn in Figure 2 and the ventilator is closed the said
pin bears against a curved or inclined surface j at the bottom of the slot i
and holds the shutter in tight contact with the frame; when, however, the lever
is moved round from the position shewn in Figure 2 to that shewn in Figure 3
the shutter is opened.
It will be obvious that my improved device is applicable not only to window
sashes and ventilator shutters working on a horizontal hinge as shewn but also to
those which are hinged vertically.
It will be obvious that the arrangement herein before described may be slightly
modified by attaching the pin to the hinged sash or shutter and forming the
slotted plate upon one arm of the pivoted lever.
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:
―:
In apparatus for opening, closing and fastening windows and ventilators the
combination of a pivoted bell-cranked lever designed to be attached to the window
frame, a slotted plate designed to be fixed upon the window sash or ventilator
shutter and a pin fixed upon the bell-cranked lever and entering the said slot, tho
latter at that part against which the pin bears when the device is in the locking
position, being provided with a curved or inclined surface, substantially as
described.
TY
1 1
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.