Improvements in Locks.
Year: 1891

page_text: Date of Application, 13th Apr., 1891
Complete Specification Left, 10th Oct., 1891-Accepted, 14th Nov., 1891
PROVISIONAL SPECIFICATION.
Improvements in Locks.
I, JOHN EBENEZER BOUSFIELD, of the firm of G. F. Redfern & Co., the
General Patent Office, No. 4, South Street, Finsbury, in the County of Middlesex,
Patent Agents, do hereby declare the nature of this invention, (a communication
to me by George Piddington, of Caversham, Otago, New Zealand) to be as
follows
This invention relates to rim locks.
In carrying out the invention the lock case is made of semi-circular form at its
rear end and with rounded corners at its front end, so as to avoid the possibility
of a person's dress catching onto the same.
The front end of the push back or handle-bolt is cranked or set back and carries
an anti-friction roller which serves to soften the blow upon the striking-plate; it
is also provided on its top edge with a notch in which engages a pivotted tooth
operated by a thumb-piece outside the lock-case in order to fix the said bolt
when required. This bolt is cut away on a portion of its under edge to receive
the upper edge of the locking-bolt which is also cranked and abuts against a
shoulder formed by the cut away portion of the handle-bolt, so that both bolts
are shot and fixed by the turning of the key.
A lever is provided on each side of the locking-bolt, through which levers is
passed a loose pin on which bears one end of a spring fixed between studs and
having its other end bearing against the handle-bolt, so that it acts on the loose pin
and causes the levers to operate independently of each other and also on the handle-
bolt, thus securing both the bolts. The cranked ends of the bolts work in a pocket
formed in the lock-case.
The striking-plate is formed with a channel for the handle-bolt situated between
two checks adapted to fit the architrave or facing and with openings to receive
the two bolts.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Locks.
I, JOHN EBENEZER BOUSFIELD, of the firm of G. F. Redfern & Co., the
General Patent Office, No. 4, South Street, Finsbury, in the County of Middlesex,
Patent Agents, do hereby declare the nature of this invention (a communication to
me by George Piddington, of Caversham, Otago, New Zealand) and in what
manner the same is to be perforined, to be particularly described and ascertained in
and by the following statement :-
This invention relates to rim-locks, the object being mainly to so construct
them that they can be used with a striking-plate similarly to mortice locks,
thereby rendering unnecessary the objectionable projecting box-staple of ordinary
rim locks.
In the accompanying drawings,
Figure 1 is a front elevation of a lock constructed according to this invention
and shewn applied to a door:

page_text: Figure 3 is a horizontal section of the striking-plate:
Figure 4 is a rear elevation of the lock with the covering-plate removed:
Figures 5 and 6 are horizontal sections on the lines A and B C respectively of
Figure 3.
Similar letters in all the figures indicate similar parts.
In carrying out the invention the lock case a is made of semi-circular form at its
rear end and with rounded corners at its front end, as shewn in Figures 1 and 4,
so as to avoid the possibility of a person's dress catching onto the same. The
front end of the push back or handle-bolt is cranked or set back at e, as shewn
most clearly in Figure 5, and carries anti-friction rollers d, d (or a single anti-
friction roller) located in a recess e therein, which rollers serve to soften the blow
upon the striking-plate; it is also provided on its top edge with a notch,
Figure 4, in which engages a pivotted tooth operated by a thumb-piece i outside
the lock-case in order to fix the bolt when required; is a slot moving over a
guide pink fixed in the ease a for guiding the rear end of the bolt b. The under
edge of the bolt is cut away at 1, Figure 4, to receive the upper edge of the
locking-bolt m which is cranked at n, as shewn most clearly in Figure 6, and abuts
against the shoulder o formed by the cut away portion of the handle-bolt b, so that
both bolts are fixed when the key, introduced into the key hole a', is turned to lock
the door , Figure 1.
c is a slot in the locking-bolt m moving over a guide-pin fixed in the case a
for guiding the rear end of the said bolt.
p is the boss for receiving the handle spindle (not shewn in the drawing) such
boss being provided with the usual arms, which, when the handle is turned in
either direction to open the door, move the bolt inwards by bearing against the
projection thereon.
Tumblers s, s are provided, (one on each side of the locking-bolt) working on
the guide-pin d', through which tumblers is passed a loose pin on which bears one
end of a spring u fixed between studs, e, e and having its other end bearing
against the rear end of the handle-bolt b, so that it acts on the loose pin t and
causes the tumblers s, sto operate independently of each other and also on the
handle-bolt b, thus securing both the bolts when the locking-bolt, m is shot. The
cranked ends of the bolts and m work in a pocket w formed in the lock-case a,
the said pocket being intended to be let into the edge of the door so that the noses
of the bolts shall be in the same position that they would occupy if the lock were
a mortice-lock.
The striking-plate f, Figures 1, 2 and 3, which I employ with my improved rim-
lock in place of the box-staple used with ordinary rim-locks is provided with an
inclined projection having two checks y, y forming a guide-channel for the
nose e of the handle-bolt. 6, the said striking-plate with its projection being adapted
to fit the architrave or facing f' of the door frame. The striking-plate is also
provided with openings g' and ' to receive the bolts band m respectively.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination of parts constituting my improved lock, substantially as
hereinbefore described and illustrated in the accompanying drawings.
2. The use for a lock such as that herein described, of a case made of semi-
circular form at its rear end and with rounded corners at its front end, for the
purpose described and as illustrated in the accompanying drawings.
3. In a rim-lock the use of handle and locking bolts having their front ends
cranked or set back in such a manner as to adapt the lock for use with a striking-
plate instead of a box-staple, substantially as hereinbefore described.
4. In a rim-lock the described means for simultaneously fixing both the handle
bolt and the locking bolt when the key is turned to lock the door, substantially as
hereinbefore described.

page_text: 5. In a rim-lock the combination with a handle-bolt and a locking-bolt
constructed as described of an anti-friction roller or rollers for the purpose
set forth.
6. The combination with a rim-lock having a bandle-bolt and a locking-bolt
provided with cranked ends as described, of a striking-plate of the construction
and shape set forth and illustrated in Figures 1, and 3 of the accompanying
drawings.
7. In a rim-lock having handle and locking-bolts provided with cranked front
ends for the purpose described, a pivotted tooth adapted to engage, by operating
a thumb-piece outside the lock case, in a notch in the top edge of the handle-bolt,
substantially as and for the purpose, herein before described and as illustrated in
Figures 1, 4 and 5 of the accompanying drawings.
8. In a rim-lock the combination with handle and locking-bolts provided with
cranked ends as described, of the spring u arranged and operating substantially in
the manner set forth.
Dated the 9th day of Sentember 1891
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.