Year: 1894

page_text: I, WILLIAM BLAIR, of Portland Chambers, Longton, Staffordshire, Copper
Plate Engraver, do hereby declare the nature of this invention to be as follows:-
In the Specification accompanying my application for Letters Patent No. 2,911
of 1894 I describe a new or improved window catch presenting certain. advantages.
The shid window batch consists as specified of two pieces, one termed in the said
Specification the striking pieco and the other termed 'in 'the said Specification the
locking piece.
In my present invention I employ a striking piece similar to that described in
my above mentioned former Specification; but the locking piece employed in my
present invention differsyoobsiderably from that described in my former Specifi-
cation.
In proceeding to describe the looking piece of my present invention I shall first
refer to those parts of it which are similar to parts existing in the locking piece of
my above mentioned former invention; and thereafter I shall describe those parts
which differ from the parts of my said former invention.
The locking piece of my present invention has, like the locking piece of my
former invention, a flange or base plate or the like for attachment to the upper rail
of the lower window sash'; 'and it also has projections or fingers 'adapted to, grip
the striking piece and press it towards itself, that is to say, press the striking piece
and the looking piece olosely together. The bolt of my present invention is
somewhat similar in general form to the bolt employed in
but it differs therefrom in this respect, amongst others, former invention;
instead of being
reciprocated by a spring it is reciprocated by means of a device which I shall
hereinafter refer to as the weighted drop lever. The bolt of my present invention
further differs from that of my former invention in that it has a recess or depression
by means of which it is engaged, for the purpose of operation, by a part of the
weighted drop lever. The said weighted drop lever consists of an angular or bent
lever, one arm; which I shall hereinafter refer to as the "free" arm, being
weighted, and the other arm, which I shall hereinafter term the dipping” arm,
being designed to engage in the herein before mentioned recess or depression in the
bolt. The said weighted drop lever is hinged at its angle and the case of the
locking piece is slotted for outaway so that the 'dipping arm may pass therethrough
to the recess or depression in the bolt.
The dipping arm engaging in the recess or depression of the bolt, the said bolt
will be reciprocated by any motion of the weighted 'drop lever. "The weight on
the free arm of the lever, tending to take up its lowest position will cause the
dipping arm, pressing against the side of the recess in the bolt, to move the latter
into its normal position, and to maintain it there. By the normal position 1 mean
the position which the parts occupy when locked. Thus it will be seen that the
weighted free arm constantly tends to lock the sashes. When it is desired to
unlock the sashes all chat is necessary is to raise the 'free arm so as to withdraw the
bolt. To maintain the bolt in its withdrawn position the free arm may be raised
until it slightly passes the vertical line over the hinge where it may be retained in
position by a stop of any convenient kind; 'ns for example by resting against a fixed
part. When thue placed the free arm is in an unstable position so that a slight
movement of the sash, such as would take place in the act of closing the window,
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page_text: "
would cause the free arm to drop and the bolt to be moved into its normal or
locking position.
I have hereinbefore spoken of one arm of the lever dipping into a recess in the
bolt. I desire it to be understood that I may reverse this by putting a projection on
the bolt and a recess on the lever or I may fit either of these parts with a number
of projections or recesses or the like.
"
"
When it is desired to retain the bolt. in a withdrawn or partially withdrawn
position I may in some cases, instead of relying on such a stop as I have herein-
before referred to, employ a lover (hereinafter termed a stop-lever), hinged or
pivotted to the free arın. When the parts are in their normal position this
stop-lever may lie alongside or parallel to the free arm and when the said free arm is
raised the stop-lever may be moved angularly with respect to the free arm so that one
of its ends may engage or rest against any convenient part of the locking piece...
Dated this 11th day of October 1894.
7
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1, WILLIAM BLAIR, of Portland. Chambers, Longtou, Staffordshire, Copper
Plate Engraver, 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:-
1
In the Complete Specification accompanying, my Letters Patent No. 2911 'of
1894, '1'describe a new or improved window catch or sash fastener presenting certain
advantages and which I shall hereinafter refer to as my "spring form" of sash
fastener. The said " spring form of sash fastener consists of two pieces, one
termed in the said Specification the striking piece" and the other termed in the
said Specification the "locking piece."
In my present invention which I shall hereinafter refer to as my "gravity form"
of sash fastener employ a striking piece similar to that described in the
Specification accompanying my said Letters, Patent; but the locking piece
employed in my present invention, or gravity form of sash fastener, differs
considerably, from the locking piece of my spring, form described in the said
former Specification.
זי
,1
1
"
In proceeding to describe the locking piece of my gravity, form I shall first refer
to those parts of it which are similar to parts existing in the locking piece of my
spring form; and thereafter I shall describe those parts which differ from the parts
of my spring form.
For the purpose of such description I shall refer to the accompanying sheet of
drawings which illustrate by way of a type or example one form of my present
'invention the said form giving good results in practice..
"T
Figure 1'is a plan of a said form of my gravity sash fastener.
Figure 2 is a front elevation of the same.
} 1i
Figure 3 'is a longitudinal vertical section with the parts shown in their normal
or locking position.
"
171 Figure 4 is u longitudinal vertical section of the same showing the parts in their
unlocked position or in other words when the bolt is withdrawn.
h.
1
Figure 5 is an isometric projection showing the parts in their locked position.
Figure 6 is an illustration showing a modification of my invention.
The locking piece B of my gravity form, has like the locking piece of my spring
J...

page_text: form, a flange or base plate for attachment to the upper rail of the lower
window sash; and it bas also projections or fiugers CC similar to and fulfilling
the same functions as the projections or fingers CC of the spring form. The
bolt D is similar in general form to the bolt D of the spring form of my invention ;.
Jut it differs therefrom in this respect, amongst others, that instead of being
adapted for reciprocation by a spring it is adapted for reciprocation by means
of a device F which I shall hereinafter terin the "weighted drop lever."
The bolt D' of my gravity form differs also from the bolt D of my spring form
in that it has a recess or depression by means of which it is engaged, for the
purpose of operation, by a part of the weighted drop lever as I shall now describe.
The said weighted drop lever F consists of an angular or bent lever, one arm f',
hereinafter termed the "free arm," being weighted and the other arm, herein-
after termed the dipping arm, being designed to engago in the hereinbefore
mentioned recess or depression d in the bolt D'. The said weighted drop lever F
is hinged at its angle for example upon the pin f and the case of the locking
piece is slotted or cut away at 6 so that the dipping arm may pass there-
through to the recess or depression d' in the bolt D₁.
The dipping arm f' engaging in the recess or depression d' of the bolt D!, the
said bolt D will be reciprocated by any motion of the weighted drop lever F.
The weight on the free arm of the lever, tending to take up its lowest position,
will cause the dipping arm f, pressing against the side of the recess in the bolt,
to move the latter into its normal position as shown in Figure 3, and to maintain
it there. By the normal position I mean the position which the parts occupy wben
locked. Thus it will be seen that the weighted free arm constantly tends to
lock the sashes. When it is desired to unlock the sashes all that is necessary is.
to raise the free arm so as to withdraw the bolt D¹. To maintain the bolt in
its withdrawn position the free arm f' may be raised until it slightly passes the
vertical line over the hinge as shown in Figure 4 where it may be retained in
position by a stop of any convenient kind, as for example by the dipping arin resting
against a fixed part 4. When thus placed the free arm is in an unstable
position so that a slight movement of the sash, such as would take place in the act
of closing the window, would cause the said free arm f¹ to drop and the bolt D' to
be moved into its normal or locking position.
I have hereinbefore spoken of one arm of the lever dipping into a recess in
the bolt. I dosire it to be understood that I may reverse this by putting a
projection on the bolt and a recess on the lever: or, I may fit either of these parts
with a number of projections or recesses or the like. This form is illustrated in
Figure 6.
It will be seen that in the gravity form of my invention it is not necessary that
the nose of the bolt should be wedge shaped. It may be chisel shaped.
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
claiin is:-
1. The new or improved window catch or sash fastener substantially as set
forth.
2. In the locking piece of a window catch or sash fastener, the combination of a
weighted lever and a bolt substantially as and for the purpose set forth.
3. In a window catch or sash fastener the employment of a weighted lever
substantially as and for the purpose set forth.
4. The arrangement and combination of parts substantially as set forth with
reference to Figures 1 to 5 inclusive.
5. The modification set forth with reference to Figure 6.
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1005