IMPROVEMENTS IN
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said Bruno Wesselmann at the
Office of the Commissioners of Patents on the 22nd September 1883.
BRUNO WESSELMANN of Hamburg Germany Engineer
LOCKS
"
"IMPROVEMENTS IN
This Invention has for its object improvements in locks and relates more
especially to indoor-locks but is applicable to any others.
My improvements consist firstly in the use of only one spring for arresting all
bolts of the lock and simultaneously for moving the spring-bolt. Secondly to keep
the latch immovable when the door is locked by throwing.
The spring is advantageously a spiral one, which influences the whole mechanism
of the lock and the said spring may be enclosed within a barrel or other guiding
device the lower end of which is conically shaped and rests in a conical hole or
recess in the tumbler. The lower end of the pin at the opposite end may be
tubular or have a recess to receive the upper or opposite end of the spring and the
said pin forms the head of such spring and slides partly inside the barrel or other
equivalent guiding device allowing of compression between the tumbler and the
hook-shaped prolongation attached to or forming part of the latch-nut.
The said spring also serves to arrest the safety bolt.
The tumbler arresting the key-bolt is provided with a prolongation the shoulder
of which engages into the notches of such safety-bolts. When two or more of such
bolts are arranged in a lock, the prolongation of the tumbler may be extended and
provided with a corresponding number of projections engaging into the bolt
notches.
The nut of the latch is composed of two parts, the inner one of which is
perforated for receiving the latch pin; the outer one is provided with the before
mentioned hook-shaped projection. A finger sliding in a slit of the outer-nut is
fixed to the inner nut and serves to communicate the motion of the latch to the
outer-nut. A short spiral spring is drawn over the latch-pin and compressed
between the shoulder of the latch, and the inner nut keeps the latter immovable
when the spring-bolt is pushed backwards without the application of the latch,
when the door is closed sharply.

page_text: --
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Bruno Wesselmann in the Patent Office on the 21st March 1884.
"IMPROVEMENTS IN
BRUNO WESSELMANN of Hamburg Germany Engineer
LOCKS"
This Invention relates to certain improvements in locks by which the construction
of the same is considerably simplified and the invention consists of the combination
with the spring-bolt, main-bolt, and latch, of a spiral spring that is interposed
between the spring-bolt, main-bolt, and the tumbler of the main-bolt, said tumbler
having a downwardly extending arm that engages the latch, so that thereby the
bolts and latch are acted upon by one spring only.
In the accompanying drawing Figure 1 represents a side elevation of my
improved door lock with the cover removed; Figure 2 is a vertical transverse
section, and Figures 3, 4 and 5 illustrate details.
A in the drawing represents the casing of my improved door-lock, in which is
arranged one below the other, the spring-bolt E, the main-bolt H, and a latch-
bolt F. The spring-bolt E projects with its bevelled end- through an aperture of
the face-plate of the casing, and is provided at its hind end with a rectangular
frame E, wherein the double-armed nut is actuated by means of the door-knob-
spindle. A spiral spring, which is interposed between the head of the spring-
bolt E and the tumbler G, pushes the bolt E in such a direction as to close the
lock.
The spiral spring may either be of shape as illustrated by Figure 5, or of the
construction shown in Figure 4. In the latter a slide-bolt C¹ is guided in a socket C²
and cushioned by a strong spiral spring C, which is interposed between the slide-
bolt C¹ and the bottom of the socket. The lower end of the socket C' is made of a
conically-tapering shape, and seated in a conical depression of the tumbler G of the
.main-bolt H.
From the tumbler G extends in a downward direction an arm G¹, that is
provided at its lower end with a shoulder G³, which shoulder engages into notches
of the latch F. In case two or more latches are arranged in a lock, the rod G is
extended downwardly and provided with a corresponding number of shoulders G.
It will be seen that by the arrangement of the spring C, slide-bolt C', and its
socket C³ between the spring bolt E and the tumbler G of the main-bolt the
spring C acts on all the three bolts E, H and F of the lock, according as either one
of them is thrown into use. It acts on the spring bolt E by the pressure of the
alide-bolt C, and on the main-bolt H and latch F by the pressure of the socket C
on the tumbler G. Also the double spiral spring as illustrated in Figure 5 will
produce the same effect, when replacing the construction Figure 4. The construction
of the lock is thereby considerably simplified, as the different springs, which have
heretofore been required in connection with the different bolts, are replaced by a
single spring.
Figure 6 is a side elevation, and Figure 7 a vertical section of a modification of
the above-described lock, of which Figure 8 shows the tumbler.
The spiral spring C, which acts upon the tumbler G of the main-bolt H and the
spring-bolt E is placed around the rod E' connecting the bevelled part of the
spring-bolt with its rectangular frame E'.
Having thus fully described my Invention, what I desire to claim and secure by
Letters Patent, is-
First. In door-locks the combination of the spring-bolt, and the tumbler of the
main-bolt with a single spiral spring which either may be placed into a socket and

page_text: acting upon a slide-bolt as shown at Figure 4, or which may be shaped as shown
in Figure 5, substantially as set forth.
Second. In door-locks the combination of the spring-bolt E, main-bolt H,
tumbler G, arm G₁, shoulder G2 and latch F with the spiral spring either in combi-
nation with the socket C² and slide-bolt C¹, or shaped as a double spring,
substantially as and for the purpose specified.
Third. In door-locks the combination of the spring-bolt E, frame E¹, connecting-
rod E2, and spiral spring C with the tumbler G and main-bolt H, substantially as
and for the purpose specified.
In witness whereof I the said Bruno Wesselmann have hereunto set my hand
and seal this Seventeenth day of March in the year of our Lord One thousand eight
hundred and eighty four.