Year: 1886

page_text: [Communicated from abroad by John Arthur Murray, M.D., and George Winslow
Murray, School Teacher, Citizens of the United States, residing at Ansonville,
in the County of Clearfield and State of Pennsylvania, United States of
America.]
I, ALEXANDER MELVILLE CLARK, of the firm. of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this. Invention a communication to me
from abroad by John Arthur Murray M.D. and George Winslow Murray School
Teacher citizens of the United States residing at Ansonville in the county of
Clearfield and State of Pennsylvania United States of America, to be as follows:-
This Invention relates to a springless, burglar-proof lock and latch which will
not be affected by the jarring or slamming of the door to which it is applied, and
which will be inexpensive in its construction and not liable to derangement.
The Invention consists in a reversible latch bolt operated by the spindle and
follower in the usual way, and pressed forward by means of a weighted lever bearing
against its inner end; the Invention also consists in a dead bolt, provided with
gravitating tumblers for holding it in the locked position, and with an auxiliary
tumbler for holding it in the unlocked position; it also consists in the combination
with the weighted latch-operating lever of a button for holding the lever over the
key-hole of the lock, and in engagement with the dead bolt also through the
medium of the lever holding the latch bolt in the projected position.
The weighted lever is bent, its shorter arm projecting upward behind the inner
end of the latch bolt and its longer and heavier end projecting toward the front or
outer end of the lock. This end of the lever is provided with a notch in the
upper surface thereof for engagement with the end of a button whereby the longer
arm of the lever may be locked in its lowest position. The dead bolt is engaged
by tumblers working in recesses on the side of the bolt, and engaging with
shoulders on the bolt at the ends of the recesses. These tumblers are pivoted on
pins fixed to the casing and passing through longitudinal slots in the bolt. A pair
Prive 81

page_text: of tumblers are used to retain the bolt in the shot position, and a single tumbler
is used to retain it in the retracted position, the tail ends of both sets of tumblers
extending across the notch in the bolt in which the key-bit works for operating
the tumblers and the bolt. The bolt has a second notch with which a nib on the
weighted lever engages when the latch and bolt are both shot. In this position
the weighted lever covers the key-hole, and it may be locked in this position by
turning the button above mentioned. To unlock the lock, the button is disengaged
from the lever, the follower turned so as to retract the latch bolt, raise the longer
arm of the lever, and uncover the key-hole. The key can then be inserted and
turned to withdraw the bolt; it first disengages the tumblers from the bolt which
hold it in the shot position and then withdraws the bolt. The other tumbler then
again engages the bolt and the key may be withdrawn and the knob may be
released permitting the weighted end of the lever to drop, pushing the latch bolt
forward into its normal position.

page_text: I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agenta, do hereby declare the nature of this Invention (a communication to me
from abroad by John Arthur Murray M.D. and George Winslow Murray School
Teacher citizens of the United States residing at Ansonville in the County of
Clearfield and State of Pennsylvania United States of America), and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement -
This Invention relates to a springless, burglar-proof, lock and latch, which will
not be affected by the jarring or slamming of the door to which it is applied and
which will be inexpensive in its construction and not liable to derangement.
The Invention consists in a reversible latch bolt operated by the spindle and
follower in the usual way and pressed forward by means of a weighted lever bearing
against its inner end..
The Invention also consists in a dead-bolt provided with gravitating tumblers for
holding it in the locked position and with an auxiliary tumbler for holding it in
the unlocked position it also consists in the combination with the weighted latch
operating lever of a button for holding the lever over the key-hole of the lock and
in engagement with the dead-bolt, also through the medium of the lever holding.
the latch bolt in the projected position...
Reference is to be had to the accompanying drawings forming part of this
Specification in which figure 1 is a front elevation of the lock with the cover
removed. Figure 2 is a rear elevation with the back of the casing removed;
figure 3, is a transverse section taken on line xx in figure 2. Similar letters of
reference indicate corresponding parts in the different figures of the drawings.
A is the casing, B the follower, and C the knob spindle, all as usual; and D is a
reversible latch bolt having the frame E surrounding the cylindrical part of the
follower B; its bevelled end a projects through the end of the casing as usual, and
its shoulder b is in position to be acted on by the arms of the follower B. It has
shoulders b on opposite sides to admit of its being reversed to suit right and left,
hand doors. In the casing A is pivoted a bent weighted lever F upon a stud' c
projecting from the back of the casing. The shorter arm d of the lever F projects
upward behind the inner-end of the latch bolt D and the longer and heavier end e of
the lever F projects toward the front or outer end of the lock and is provided with a:
notch fin the upper surface thereof near the end for engagement with the end: of
the button g when it is turned to lock the longer arm e of the lever F. in its lowest
position as indicated in figure 1. At the lower part of the lock casing A is placed
the lock-bolt G with its end h projecting through the face of the lock. The bolt G,
is provided with a longitudinal alot i traversed by the pin.j fixed in the lock

page_text: 8
casing, and recesses k are formed in opposite sides of the bolt G to receive the
tumblers which are pivoted on pin j. Each tumbler has a long arm m and a
short arm n, the longer arm being provided with a shoulder o for engaging the
shoulder p formed on the bolt G when the bolt is shot; the shorter arm n of each
tumbler extends across a notch q formed in the bolt in which the key acts on the bolt
and tumblers as hereafter described. In one side of the bolt G towards the
inner end is formed a recess r for receiving the tumblers which is pivoted on the
stud t fixed in the lock casing. The tumbler a is provided with a long arm m¹ and
a short arm n', the long arm having a shoulder o¹ for engaging the shoulder p¹
formed on the bolt at the side of the recess r. Behind the key-notch q in the bolt
there is a V-shaped notch u for receiving a V-shaped tongue v projecting from the
lower edge of the arme of the lever F. When the bolt G is withdrawn the
shoulder o¹ of the tumbler 8 engages the shoulder p¹ on the bolt G and prevents the
bolt from being accidentally shot by jarring or otherwise, and when the bolt is in
this position the longer arms of the tumblers / rest upon the shoulders p. When
the latch bolt D is shot the longer arme of the weighted lever F rests on the
bolt. G and covers the. key-hole H and when it is desired to shoot the bolt G the
follower B is turned to withdraw the latch bolt D and cause it to raise the longer!
arm of the lever F and uncover the key-hole, so that the key may be inserted.
When the key is inserted and turned the bit of the key enters the notch q in the
bolt and acting on the shorter arm n¹ of the tumbler 8 disengages the longer arm
of the tumbler from the shoulder p¹ to permit the bolt to be shot by the key
whereupon the tumblers fall by their own gravity so that their shoulders o:
engage with the shoulders p on the bolt thus locking the bolt in the shot position:
so that it cannot be pushed back or unlocked without first disengaging the tumblers
by means of the key in the manner presently to be described.
As soon as the door is locked by shooting the bolt as described the key is with-
drawn and the longer arm of the lever F is allowed to drop so as to cover the
key-hole and prevent the insertion of the key into the lock; and if it is desired
to increase the security of the door by fastening the latch bolt D this may be done
by turning the button g by means of its handle g' which is outside of the lock.
casing so as to bring the end of the button into the notch f formed in the arm e of
the lever F. When the bolt G is shot and the lever F is in its lowest position the
tongue is received in the notch u of the bolt G thus furnishing an additional
protection against the forcing of the bolt. To unlock the lock, the button g is
disengaged from the lever F, the follower B turned so as to retract the latch
bolt D, raise the longer arm of the lever F and uncover the key hole and the key
can then be inserted and turned to withdraw the bolt; it first engages the shorter
arms n of the tumblers (which are now opposite the bottom of the notch q and in
the path of the bit of the key) thus disengaging the longer arms of the tumblers
from the bolt and then withdraws the bolt. The shoulder o¹ of the tumbler & then
again engages the shoulder p¹ of the bolt and the key may be withdrawn and the
knob may be released permitting the weighted end of the lever F to drop pushing
the latch bolt D forward into its normal position.
.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed declare that what
I claim is;-
1. The combination with the latch bolt D of the weighted lever F pivoted in
the lock casing and adapted to push the latch bolt forward substantially as herein
shown and described. .
2. The combination with the latch bolt D and knob nut B of the weighted
angled lever F substantially as and for the purpose herein specified.
3. The combination with the bolt G of pivoted gravity tumblers / adapted to
engage the shoulders of the bolt G when projected and arranged to be operated by
the lock key substantially as herein shown and described.

page_text: 4. The combination with the lock bolt G of the gravity tumbler s pivoted in the
lock casing and adapted to retain the bolt in an unlocked position substantially as
herein shown and described.
5. The combination with the bolt G having recesses kr formed in the sides
thereof, and provided with shoulders p p¹ of the pivoted gravity tumblers (8
adapted to engage the shoulders p p substantially as berein shown and described.
6. The combination with the bolt G provided with a V-shaped notch u of the
weighted lever F having the V-shaped tongue v adapted to engage the notch u of
the bolt substantially as herein shown and described.
7. The combination with the weighted lever F provided with the notch f of
the button g pivoted in the lock casing and adapted to engage the notch ƒ
substantially as herein shown and described.
8. The combination with the latch bolt and lock bolt of a lock of a weighted
lever pivoted in the lock casing and adapted to close the key hole of a lock
substantially as herein shown and described.
9. The combination in a latch and lock of the latch bolt D, the knob nut B, the
weighted pivoted lever F provided with a short arm d and a long arm e having
the notch f and V-shaped tongue v, the slotted bolt G having notches q u and
recesses kr and provided with shoulders p p¹, the gravity tumblers ? 8 provided
with shoulders o o¹, and the button g adapted to secure the lever F in its locked
position substantially as herein shown and described.
DOLL
A1 1000