Improvements in Window Sash Fasteners.
Year: 1898

page_text: 7
Date of Application, 18th July, 1898
TOP
T
1000
OALL
4000
PROVISIONAL SPECIFICATION.
Improvements in Window Sash Fasteners.
We, ARTHUR GEORGE TONKS, of the Firm of J. & A. Tonks Limited, of Cam-
bridge Street, in the City of Birmingham, Director, and JOHN BURN, of
Mawdach, Showell Green Lane, Sparkhill, in the City of Birmingham, Tool
Maker, do hereby declare the nature of this invention to be as follows;-
-
This invention relates to improvements in window sash fasteners, and refers
more particularly to the construction and arrangement of the lever arm.
Broadly, this arm consists of two plates, the one surmounting and riveted to the
other. The lower plate is made of inferior metal, (such as iron or steel) while
its upper surface or plate may be of brass or other superior metal. At the pivot
end of the upper plate, the metal is raised, thus forming a gap between it and
the lower plate. If left thus however the one side of this gap is exposed to
view particularly when the fastening is in its open position. To avoid this we
carry the metal downwards from the upper plate at such part, which thus con-
ceals the gap and imparts a solid like appearance to the arm. Preferably we form
such upper part by the stamping process, and in some cases the underside of the
top plate is recessed so that the bottom plate may lie therein entirely concealed
from view. At the inner end of the said two plates forming a slight extension
(inclining to the one side) are lugs receiving a vertical pivot pin upon which is
carried a broad antifriction roller between the plates which act upon the usual
spring carried in the frame of the fastening. At the outer end of the arm is
secured the ordinary knob or similar fitting. Instead of using an upper plate of
superior metal we may of course make it of inferior metal and then coat it as
desired.
The usual pivot holes for the main pivot attachment to the frame together
with the pin are carried out much as usual.
CHARLES T. POWELL,
Applicants' Agent.

page_text: Maker, 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 window sash fasteners, and refers
more particularly to the construction and arrangement of the lever arm.
In order to more clearly explain this our invention we have appended here-
unto an illustrative drawing upon which are figures and numbers of reference
similar numbers referring throughout the several views to the same thing
or part.
Fig. 1, is a general side view of the sash fastener lever arm made according to
this our invention, and shown partly in section.
Fig. 2, is a plan view of the said lever arm.
Fig. 3, is a cross sectional view of the arm on line A-B (Fig. 1).
Fig. A, is a cross sectional view of the arm on line C-D (Fig. 1).
Fig. 5, is a plan view (approximately) of the blank from which the top plate
is made.
Fig. 6, is a plan view of the bottom plate.
The lever arm consists of twe plates 8 and 9, the one 8, surmounting. and
riveted to the other 9. A thickness washer 10, may be used, or instead of this
the lower plate 9, may be cranked upwards at its end to lie against the plate 8.
The lower plate 9, is made of inferior metal (such as iron or steel) while the upper
plate 8, may be of brass or other superior nietal. At the pivot end of the upper
plate, the metal is raised, thus forming a gap 11, between it and the lower plate.
We further carry the metal downwards at 12, 12, from the upper plate, which
thus conceals the gap 11, from view in the direction of arrows 13, and imparts a
solid like appearance to the arm. Preferably we form such upper part 8, by the
stamping process, and the underside of the said plate 8, is recessed so that the
bottom plate 9, may lie therein entirely concealed from view as shown in
Figs. 3 and 4. At the inner end of the said two plates and forming a slight
extension (inclining to the one side) are lugs 14, and 15, receiving a vertical pivot
pin 16, upon which is carried a broad antifriction roller 17, between the plates,
and preferably consisting of a number of thin rollers, which act upon the usual
spring carried in the frame of the fastening (not shown). At the outer end of
the arm is secured the ordinary knob 18 or similar fitting. Instead of using an
upper plate 8, of superior metal we may of course make it of inferior metal and
then coat it as may be desired.
The usual pivot holes 19, for the main pivot attachment to the frame together
with the pin are carried out much as usual.
Having now particularly described and ascertained the nature of this our said
invention, and in what manner the same is to be performed, we declare that
what we claim is :-
A sash fastener arm, comprising the hollow covering plate 8, attached to and
surmounting the plate 9, so as to cover it along its sides and at 13, together with
its other accessory parts, substantially as set forth and shown.
Dated this 17th day of Annil 1900
CHARLES T. POWELL,
Applicants' Agent,
International Exchange Buildings,
Edmund Street, Birmingham.
CHARLES T. POWELL,
Applicants' Agent,
International Exchange Buildings,
Edmund Street, Birmingham.