Year: 1886

page_text: I CHARLES FERDINAND VEIT of Bartlett's Buildings in the City of London,
Commission Agent, 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:-
The object of this invention is to produce a cheap and effective lock for doors,
and the invention consists in the combination with a lock-case, of a knob latch, a
bolt constructed to engage with the latch, a spring plate acting on the bolt, two
holes formed in the spring plate, a projection formed on the bolt and constructed
to engage with said holes, and a key for moving said bolt, so that by turning the
key in the proper direction, the latch becomes locked, and it cannot be turned back
by means of the knob until the locking bolt has been moved back to its normal
position, and also that when the latch is in its backward position, it is retained in
that position, and it cannot be turned forward by means of the knob, until the bolt
has been moved to its normal position.
In the accompanying drawings, Fig. 1 represents my improved lock with the
front plate removed, and showing the latch in its unlocked position. Fig. 2 is a
vertical transverse section, in the plane y y of Fig. 1. Fig. 3 is a face view, with
part of the front plate removed, and showing the latch locked.
Similar letters indicate corresponding parts.
A designates the lock plate or case, and B is the latch, which is held in place by
the guide plate a, Fig. 1, and is moved back by means of the spring pressed cam b,
which is rocked by the door knobs, all these parts being of the ordinary con-
struction, and arranged in the usual manner, so that the latch is forward when in
its normal position. C is the locking bolt, placed at right angles to the latch, and
is held in position against the case by a lug c, which allows the bolt to move
vertically. D is a flat spring, which is secured to the lug c and to the case, and has
formed therein two holes d d' adapted to receive a stud or projection e, formed on
the bolt, when the same is in its locking or unlocking position, Figs. 1 and 3. If
desired, the back plate of the lock case may be made to take the place of this
spring plate, the plate being held down by the screw p. The locking bolt is pro-
vided on its face with two projections f, f¹, which are engaged by the web of the
key E, which is inserted through a suitable key hole g formed in the case.

page_text: In Fig. 1, the bolt C is drawn in its unlocking position, and the latch B can be
moved either forward or backward, as desired, by turning the door knob in the
proper direction. If, however, the bolt be thrown forward into its locking position,
as indicated by dotted lines in Fig. 1, it will pass behind the inner end of the latch,
and the latter will be locked, and cannot be thrown back until the bolt C has been
drawn down into its normal or unlocked position. The locking bolt itself is firmly
held in either its unlocked or locked position by the friction of the spring plate D
and the projection e on the bolt, which projection, when the bolt is locked, slips
into the hole d (Figs. 1 and 2), and when unlocked, into the hole d¹ in the spring
plate.
When it is desired to have the latch locked in its backward position, a recess h
is formed in the end of the latch, to receive the nose i of the bolt, whereby the
latch is held back, and cannot be thrown forward until the locking bolt is
withdrawn.
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
A lock for doors constructed and arranged substantially as described, and
consisting in the combination with a latch B, having a recess h, of a vertical
locking bolt C, provided with a stud or projection e, which engages with one of
two holes d, d, formed in a spring plate D, and a key for moving said bolt, as set
forth.
1000