Year: 1889

page_text: I, THOMAS HENRY RADFORD of the firm of Wootton Brothers & Radford of
11 and 12 Newton Street, Birmingham, in the County of Warwick Manufacturer,
do hereby declare the nature of my said invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the following
statement:
My invention has for its object improvements in combination night latches, which
according to my invention may also be locked so as to afford a. great amount of
extra security which we accomplish without causing any great amount of complication
in the parts.
In order that my invention may be clearly understood and easily carried into
practical effect I have appended hereunto a double sized sheet of drawings upon
which I have illustrated the internal parts of the lock and case by four views which
show the position of the parts under various circumstances as will be hereafter more
fully explained.
Figure 1, is an internal view of the lock after the inner plate has been removed.
Figure 2 is a similar view of the same lock but with the key E applied to the
key hole C and partly turned so as to partly lift the latch, the latch being in this
partly lifted position.
Figure 3, shows the same lock case D but with the parts forming the compound
or lever latch B entirely removed so as to clearly illustrate the hollow locking bolt K
as it appears when unlocked.
Figure 4 shows the same view as the previous Figure 3, but with the bolt K
as it appears when the Key E has been applied so as to throw the bolt into its
locked position.
Figure 5 is a view of the front end of the hollow bolt K showing the space M
through which the latch levers B pass and in which they operate.
Figure 6 is a view shewing the key used in this lock the wards e¹, e², e³, et, being
for the purpose of lifting of the various plates B which constitute the latch B and
of which these may be any desired number but only the outer one is seen in this
.

page_text: case the others being behind-but to this part I lay no claim-and the part es, e of
the key operate the hollow bolt K which in combination with the latch B form the
essential portion of my invention.
It will be seen from the drawings that the casing D of the combination night
latch M of the ordinary kind with the first plate extending at D¹ in the usual manner
and the latch B is composed of several plates held normally in the position shewn
at Figure 1 by a number of springs S in the usual manner. Now besides the com-
bination latch mechanism I introduce a hollow bolt K which extends back to K¹
where it is guided by the stud N over which the slot of the bolt K slides thus
guiding the bolt in its sliding action when operated by the key, for it does not move
when the latch is used in the ordinary manner by the handle H which is shown by
dotted lines only the handle H being connected to the lifter A as in locks now made.
When the bolt K is shot as seen at Figure 4 it must be done by the Key E and bolt
can only be returned by the said key. It will thus be seen that the latch can be
operated in the ordinary way as a latch simply by the handle H inside the door and
the Key E outside the door without any interference with the hollow bolt K whatever,
whereas if it is desired as at night to more thoroughly secure the latch after passing
outside, the key is applied and the bolt is shot into its position as seen at Figure 4
when it is practically impossible to move the latch until the bolt K is unlocked.
lock may thus be fitted with wards e¹, e³, e³, & e* only so as to simply operate the
latch itself such for instance as needed by a servant in the day time whereas another
key such as a master would use may have the extra wards e, and e, so as to operate
the bolt also. Figure 2 shows the key E lifting the latch B which is seen about
half way up, the key being turned from right to left, but to shoot the bolt K the
key is turned right round from left to right for this right band lock but in the
reverse direction in the left hand locks that is to completely shoot the bolt.
A
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is
The improvement in combination night latches of the hollow bolt K in combination
with the latch B mounted and operated substantially as and for the purpose herein
set forth and as shewn upon the drawings.
Dated 25th January 1889
GEORGE BARKER,
77, Colmore Row, Birmingham,
Agent for Applicant.