Improvements in the Locks for Window Sashes and the like, and in Keys for same.
Year: 1893

page_text: Date of Application, 23rd Dec., 1893-Accepted, 27th Jan., 1894
COMPLETE SPECIFICATION.
Improvements in the Locks for Window Sashes and the like, and
in Keys for same.
I FRANCIS JOSEPH JAMES GIBBONS of St. John's Works, Church Lane,
Wolverhampton, in the County of Stafford, Lock 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, reference being had to the accompanying drawings and to the letters
marked thereon :—
My invention relates firstly, to improvements in locks for window sashes, and
consists in constructing them as follows:
A round cylinder bolt having an inner screw thread is propelled forward by a
screw bar working therein, and turned by means of a key or other appliance. This
portion is fixed on the top rail of the lower sash of the window. On the side rail
of the upper sash is fixed a plate having a slotted recess to receive the bolt, this
recess being made, by preference, sufficiently long to allow of the opening of the
window about five inches when locked by the bolt being forward. Three or more
holes are drilled in the back of the said plate, within the slot, to allow of the bolt
further advancing and effectually locking the window in a fixed position.
The invention relates secondly to the keys and mode of applying same.
At the end of the screw bar is cut a slot on the side of the recess which holds
the drill pin, the key having a corresponding hole and "bit." At the back of the
revolving screw bar is a fixed key-hole plate.
Another key termed the master key is also used having no "bit," but drilled
deeper to allow of it passing further onto the drill pin than the first named key
and having a cross slot at its end to allow of it engaging on a corresponding cross-
wire in the back of the lock recess.
The actions of these two keys are that the window having been locked by
inserting the master key and shooting the bolt forward, the first named or ordinary
key can unlock same but cannot be removed from the lock, excepting after relocking,
by reason of the bolt in its drawn back position preventing the screw bar being
revolved sufficiently to allow the key a sufficient revolution to bring the "bit" on
the key opposite to the slot in the fixed key-hole plate. But the master key having
no "bit'
can be withdrawn at any time leaving the window unlocked. And by
this arrangement of keys and lock the master key can be withdrawn, leaving the
lock in such a position that the other key cannot be inserted, by reason of the slot
in the screw bar not being brought opposite the key-hole slot.
Either key can further advance the bolt to the full extent into the holes in the
recessed plate.
This arrangement and combination of keys may be applied to any locks of a
similar character to the one described.
Referring to the drawings on which similar letters of reference on the various
figures relate to similar parts.
Fig. 1 shews one of my locks for sash windows.
Fig. 2 is a view of a slotted plate.
Fig. 3 is an end view shewing the key-hole plate of lock.
Fig. 4 is a sectional view of the lock.
Figs. 5 and 6 views of the keys.
(a) Fig. 4 is the round cylinder bolt with an inner screw thread (b) working over
the screw thread (c) of the bar (d) which bar (d) is held in position by the

page_text: (g) the holes or sinkings to allow of the further locking of the bolt. (h) is the slot
cut at the end of the screw bar (d) in the side of the recess (i), and () is the drill
pin. The key Fig. 5 has a corresponding hole (k) and "bit" (!). (m) Figs. 3
and 4 is the fixed key-hole plate. The master key Fig. 6 is drilled deeper, at (n),
and has a cross slot (o) to fit over the cross wire (p) at the back of the recess (i)
at the end of the screw bar (d).
The recessed plate with holes to further shoot the bolt into may be applied to
other locking arrangements.
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. In locks for window sashes and the like, the combination of a cylinder bolt
propelled by a screw, with a recess to receive the bolt and allow of the partial
opening of the window when the bolt is shot forward, such recess having holes or
sinkings therein, to allow of the further advance of the bolt.
2. In a recessed locking-plate the addition of holes or sinkings to allow of a
further advance of the bolt.
3. Constructing keys in combination with their locking arrangements substantially
as herein set forth.
Deted this 21st day of December 1893.
HENRY F. TALBOT,
7, Cherry Street, Birmingham, Agent for the Applicant.