MENTS IN THE CONSTRUCTION OF LOCKS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said Walter Shelverton Frost at
the Office of the Commissioners of Patents on the 19th April 1882.
WALTER SHELVERTON FROST of Peckham in the County of Surrey. IMPROVE-
MENTS IN THE CONSTRUCTION OF LOCKS."
"
This Invention consists in a simple construction of lock. In the box of the lock
I fit a pin or tube on which I place loosely one one or more discs, the bolt is guided in
the box by any suitable means and is formed with a curve or curves thereon, into
one of which curves a part of the circumference of the disc or discs take, in order
that the bolt cannot be pushed back without the key.
The disc or discs have each a slot therein extending to their periphery and the
bolt has also a slot, so that when the key is inserted and turned it turns the disc,
or dises, round and the ward of the key takes into the slot in bolt and pushes it
backward or forward as the case may be, either to lock or unlock; the other curve
now fitting over the disc or discs (in the event of there being two curves) on the
bolt.
In order to complicate the lock so as to make it more secure against picking, I
propose to form the bolt of a series of plates with the key slots cut, different lengths
in each, to correspond with wards on the key, or a projection may be formed on
the disc or discs so as to perform the office of the ward or wards of a key.
In order to construct locks with radial bolts such as are employed to lock
railway carriage doors, for example, the bolt is mounted on a pin so that when the
disc or discs are turned by the key, the ward of same takes into the slot in the
bolt and causes it partly to revolve on the aforesaid pin, the bolt being formed with
suitable curves coming over the circumference of the disc so as to lock it in position
as in the former case.
For railway locks as at present in use, actuated with square or other shaped
keys without wards, I form a projection on the disc or dises to perform the office of
the ward or wards of the key.
The above is applicable for locking purposes generally and may be made with a
knob so as to be turned without a key, thus forming a locking fastener.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Walter Shelverton Frost in the Great Seal Patent Office on the
2nd August 1882.
WALTER SHELVERTON FROST, of Peckham, in the County of Surrey. "IMPROVE-
MENTS IN THE CONSTRUCTION OF LOCKS."
This Invention consists in a simple construction of lock.
In the box of the lock I fix a pin or tube on which I place loosely one or more
discs; the bolt is guided in the box by any suitable means and is formed with a
curve or curves thereon, into one of which curves a part of the circumference of the
disc or discs take, in order that the bolt cannot be pushed back without the key.
The disc or discs have each a slot therein extending to their periphery and the
bolt has also a slot, so that when the key is inserted and turned it turns the disc
or discs round and the ward of the key takes into the slot in bolt and pushes it
backward or forward as the case may be either to lock or unlock; one or other of
the curves on the bolt (in the event of there being two curves) fitting over the
disc or discs.
In order to complicate the lock, so as to make it more secure against picking I
may form the bolt of a series of plates with the key slots cut different lengths in
each, to correspond with wards on the key; or a projection may be formed on the
disc or discs so as to perform the office of the ward or wards of a key.
In order to construct locks with radial bolts, such as are employed to lock
railway carriage doors for example, the bolt is mounted on a pin so that when the
disc or discs are turned by the key the ward of same takes into the slot in the bolt
and causes it partly to revolve on the aforesaid pin; the bolt being formed with
suitable curves over the circumference of the disc so as to lock it in position as in
the former case.
For railway locks as at present in use, actuated with square or other shaped
keys without wards, I form a projection on the disc or discs to perform the office of
the ward or wards of the keys.
The above is applicable for locking purposes generally and may be made with a
knob so as to be turned without a key, thus forming a locking fastener.
On the accompanying Sheet of Drawing
Figure 1, illustrates the application of this Invention to a railway carriage latch,
the bolt being shown in a locked position.
Figure 2, is a similar view but with bolt withdrawn,
Figure 3, represents the application of this Invention to a railway carriage lock,
the bolt being shown in its locked position.
Figure 4, shows the same with bolt raised.
Figure 5, is a modification of the arrangement shown in Fig. 3.
Figure 6, being a corresponding view to that shown in Fig. 4.
Figure 7, illustrates an adaptation of this Invention to a sash fastener; being a
plan of the arrangement as it appears when open.
Figure 8, is a front view or elevation of the above, and
Figure 9, shows the same when in position for locking the sashes.
Figure 10, is an interior view of ordinary lock constructed according to this
Invention.
Figure 11, being a similar view but with the bolt drawn back, and
Figure 12, is a cross section through the centre of this lock.

page_text: Similar letters of reference indicate similar parts where such parts appear in
each of the Figures respectively.
A hain the hol
N slot in disc.
In Figures 1 to 9 it will be seen that the bolt is actuated by means of the
projection or tooth E of the disc taking into the slot F of the bolt, and that when
the bolt is moved either to its locked or unlocked position it is securely held in
such position by the part of the circumference of the disc C which is in one or
other of the curves G of the bolt, which can only be moved by turning the disc by
means of the key or handle I.
In the ordinary lock shown Figures 10 and 11, it will be seen that a slot N is made
in the disc C to receive the key O, which, turning the disc enters the slot F in the
bolt actuating it in the same way as is done by the projection E in the other
arrangements. As before stated this lock may be complicated by forming the bolt
of a series of plates with key slots of different lengths in each to correspond with
wards on the key.
Amongst the advantages of this Invention are solidity of parts with great
simplicity and total absence of springs.
Having now described and ascertained the nature of my said Invention and in
what manner the same is or may be performed, I would have it distinctly under-
stood that I do not limit myself to the precise details of construction hereinbefore
described and illustrated on the accompanying Sheet of Drawings, as such may be
varied to suit different kinds of locks without departing from the essential features
of my Invention, and that what
I claim as secured to me by the hereinbefore in part recited Letters Patent is :-
Firstly. In a lock, the bolt A having the locking curve (or curves G, and the
slot (or slots) F substantially as and for the purposes set forth.
Secondly. In a lock, the bolt A having a locking curve (or curves) G and a slot
(or slots) F, in combination with the disc (or discs) C, having the projection or
projections E, and arranged to operate substantially as hereinbefore described.
Thirdly. In a lock, the bolt (A) having a curve or curves (G) and slot or slots (F)
in combination with a disc or discs having a slot or slots (N) arranged to be
operated by a key (0) substantially as hereinbefore described.
In witness whereof I the said Walter Shelverton Frost, have hereunto set my
hand and seal, this Thirty first day of July in the year of our Lord
One thousand eight hundred and eighty two.
YTMOD
WALTER S.
S. FROST.
(L.S.)