Improvements in or relating to Window Fasteners.
Year: 1889

page_text: GOBI IETE DI MUIFICATIA
Improvements in or relating to Window Fasteners.
I, JOHN TODHUNTER of Aglionby Street, Carlisle in the County of Cumberland,
Coal Agent 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 has reference to improvements in or relating to window fasteners
and has for its object the construction of a window lock or fastener which while
performing the usual functions of a strong and substantial window lock shall give
still further security to the inmates of the house or dwelling by acting as a secret
lock in such a manner that anyone unacquainted with its mode of action cannot unless
by chance unlock the same. I will now proceed to fully describe my invention
having reference to the accompanying drawings in which Fig. 1 represents a plan
and Fig. 2 a longitudinal sectional elevation of a window fastening apparatus con-
structed in accordance with my invention; Figs. 3. 4 and 5 are respectively
explanatory cross-sections on lines AA. BB. CC. in Fig. 1 and Fig. 6 is a sectional
plan more particularly hereinafter referred to and throughout the following description
like letters of reference in the specification and in the drawings designato like
parts.
Referring to the Figures a is the window bolt or fastener arranged and working
within suitably bored out or otherwise prepared bearings a¹ formed in the brass
The bolt a
casting a which may be arranged and shaped as shown in the drawings.
is further arranged with a finger knob a3 which is screwed thereinto as indicated in
a² 15 a
Fig. 2 and is for the purpose of giving reciprocatory motion to the bolt.
small knob or projection formed on or fixed to the bolt a and it will be observed that
the short cylinder a (which forms no part of the casting a but which is independent
theroof and separate therefrom as 15 most clearly shown in Fig. 4) is furnished with
one internal longitudinal slot or groove a and one internal terminal or circumferential
groove a' at right angles or transverse to the groove a. Further the end a" of that.
portion of that bearing in the casting a' which comes immediately opposite to tho
transverse groove or slot a' aforesaid may be likewise grooved and although this
latter groove may be a circumferential one it need not be so as a segmental groove
will answer the same purpose; when therefore the circumferential groove a' and the
circumferential or segmental groove as are arranged in respect of one another as
described a singlo groove will be formed the combination thus effected having a
section double that of either of them separately and this section or groove whether
arranged in the position shown in the drawings or otherwise relatively to the apparatus
must for the purposes hereinafter shown be somewhat larger than the size or section
of the aforesaid knob or projecting pieco a. a10 is the socket pieco into which one
end of the bolt a protrudes when the window is locked and as shown in the drawings
it is screwed down to the bottom rail R of an upper window sash the casting a²
being likewise screwed down to the top rail R¹ of a corresponding lower window
sash.
a is a longitudinal groove formed in the casting a³ as shown in the drawings
and a¹ is a slot within which the finger knob a³ works as being a lock tooth in the
side of this slot arranged in the usual way. It will be seen that my invention consists
substantially in three parts viz. the bolt a and its fittings the casting a² and the short
cylinder a and within the two latter parts the former is arranged and works.
place the bolt within the casting proceed as follows:
To
Firstly having withdrawn or unscrewed the finger knob a³ insert the finger knob
end C of the bolt into the end D of the casting. Having placed the short cylinder a³
in position in the casting and as shown in the drawings push the knob a' of the bolt <<
first through slot a" in the casting and then through slot as of the short cylinder a².

page_text: The latter will then be in allignment with and to all appearances part of the casting.
Lastly replace the finger knob a³ in its position in the bolt by passing it thereinto
through slot a. The operation of my invention is as follows:
Having screwed the castings a² and a¹º onto the corresponding top and bottom sash
rails of a window and in allignment with one another it is only necessary to push
the bolt a along in the ordinary way so that its end protrudes into the piece ao to
lock the window but-and here is where my invention comes into play-the knob a
will now have slid along until it is exactly opposite the transverso grooves a a³ in the
cylinder a and in the casting a² respectively; the operator then gives the cylinder a³
a turn and from the time when the groove as is thus put out of allignment with the
knob a and until the original allignment of 6 and a is rectified the bolt a cannot
be withdrawn and the window must remain locked.
To anyone unacquainted with this mechanism which being internally arranged is
thus out of sight the window is practically unopenable but the owner of this improved
fastener can at once correct the allignment aforesaid by revolving the cylinder a
until for example a known mark thereon comes in allignment with another known
mark or scratch on for example the casting. The owner then knowing that the
groove a and knob a' are alligned and in proper allignment or the equivalent thereof
with the finger knob slot a¹ can at onco withdraw the bolt and thus unlock the
window.
It will be observed that groove all is only for the purpose of arranging the bolt a
in its position within the casting and forms no further part of the locking mechanism
and should it be desired to make provision for locking and securing the window in
other positions than the closed position this can obviously be readily effected by simply
placing a socket or sockets such as S in Fig. 2 in any position or positions on the sash
bar S required.
In Fig. 6 the arrow shows the direction of withdrawal of bolt a to unlock the
window but it will be seen that a abutting against grooved end of a³ effectually
prevents such being done until the operations hereinabove described are performed.
I do not confine myself to the particular mode of construction herein described as it
is evident that other modes will and can effect similar results e.g. the bolt a may be
arranged to work within short tubes or cylinders rivetted to a base plate instead of
being cast thereon the central or turning cylinder a³ remaining loose and independent
as above described but as the one mode is merely the equivalent of the other further
description thereof is unnecessary and superfluous.
For general purposes I prefer to uso a wrought iron or brass bolt and brass
furnishings.
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 :-
(1) The improved window fastener consisting of the combination with the bolt a
having a projecting piece or knob a' of a locking piece as having an internal
longitudinal slot aº and an internal transverse slot a' the said locking piece being so
arranged upon the bolt as that when the knob a¹ and the transverse slot a are
opposite to one another the said locking piece a³ can be revolved about the bolt a the
several parts being arranged and operating substantially in the manner and for the
purposes hereinbofore described and illustrated.
(2) The improved window fastener consisting of tho combination of parts arranged
and operating substantially as herein before set forth.
Dated this 1st .. of
1000
A. CRAWHALL CHAPMAN,
2, St. Nicholas' Buildings, Newcastle on Tyne, Patent Agent for Applicant.