Year: 1899

page_text: I, CARL ARNOLD I'RAENKEL, of 97, Alexandrinenstrasse, Berlin, in the Empire
of Germany, Manufacturer, do hereby declare the nature of this invention
to be as follows:
The letter-files now in use comprise some very complicated mechanism for the
operation of their fastening levers; it almost invariably includes a spring which
becoming weak after prolonged use is apt to render the whole contrivance
unserviceable.
Inasmuch, however, as a letter-file has to be manipulated at frequent intervals,
it is essential that it should combine perfect reliability of operation with the
greatest possible simplicity of construction.
""
These conditions are fulfilled by the letter-file forming the subject of the
present invention, and to this end the rod connecting the two lever "tongues
or arms is cranked and adapted to slide over and rest upon a projection, whereby
the locking or fastening levers are retained in the position they are to occupy
at the time, until they are forced out of such position by the application of
power.
33
It will be seen that the essential features of my invention consists in so con-
necting the "tongues" or arms of the locking levers by means of a rod, in such
manner that the movement of one compels a simultaneous and corresponding
movement of the other; and in so forming a portion of the rod that in connection
with the projection it acts as a sliding spring, and ensures the retention of the
locking levers in either of two positions, viz.: open or closed. Another pro-
arms of the levers.
jection limits the movement of the "tongues" or
In addition, an improved fastener is employed in which a lever is hinged to a
plate in such manner that when depressed its ends come into contact with rods
whereby the lever is securely fastened in position.
This mechanism which is reliable in its operation, simple in construction, and
durable, has the additional advantage that it can be produced at a low prime
cost.
D
1 13
1000
WILLIAM J. MUNDEN,
75, Chancery Lane, Agent for the Applicant.

page_text: I, CARL ARNOLD FRAENKEL, of 97, Alexandrinenstrasse, Berlin, in the Empire
of Germany, Manufacturer, 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 letter-files now in use comprise some very complicated mechanism for the
operation of their fastening levers; it almost invariably includes a spring which
becoming weak after prolonged use, is apt to render the whole contrivance
unserviceable.
Inasmuch, however, as a letter-file has to be manipulated at frequent intervals,
it is essential that it should combine perfect reliability of operation with the
greatest possible simplicity of construction.
"
These conditions are fulfilled by the letter-file forming the subject of the
present invention, and to this end the rod connecting the two lever tongues"
or arms is cranked and adapted to slide over and rest upon a projection, whereby
the locking or fastening levers are retained in the position they are to occupy
at the time, until they are forced out of such position by the application of
power.
"
It will be seen that the essential feature of my invention consists in con-
necting the tongues' or arms of the locking levers by means of a rod, in such
manner that the movement of one compels a simultaneous and corresponding
movement of the other; and in so forming a portion of the rod that in connection
with the projection it acts as a sliding spring, and ensures the retention of the
locking levers in either of two positions, viz.: open or closed. Another pro-
jection limits the movement of the "tongues" ог arms of the levers.
This mechanism which is reliable in its operation, simple in construction, and
durable, has the additional advantage that it can be produced at a low prime
cost.
"
"
In order that my invention may be fully understood and ascertained, I append
drawings in which:
Fig. 1 is a longitudinal section of the improved letter-file, and
Fig. 2 a plan of the underside of same.
The lower ends of the fastening or locking levers n are formed integrally with
or rigidly attached to arms or tongues" b. These are connected by the rod d
which is cranked upwards at c. The cranked portion c is adapted to engage with
a projection e which retains it, the rod d, the arms 6 and the locking levers a
in either of two positions until the levers a are forced by the hand to the alter-
native position. According to the position of the levers, the crank will be placed
either on one or on the other side of the projection e. The stop n serves to limit
the extent of motion of the tongues.
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:
1. A letter-file the main feature of which is a cranked connecting rod such
as d acting as a spring, the cranked portion c of which is adapted to be drawn
with a certain amount of reliance over a stationary projection such as e, for the
purpose of retaining locking or fastening levers such as in the terminal position
they are occupying at the time substantially as described and shewn.
2. A letter-file consisting substantially of a stand projecting from the upper

page_text: side of which are two locking or fastening levers a capable of being turned
through a part of a circle, each having attached to it underneath the said stand
an arm or tongue 6, these being connected by a rod d, cranked at one portion c
so that it can be fixed in either one of two positions, substantially as described
and shewn.
3. In a letter-file the combination of a stand, two locking or fastening levers
each having an arm or tongue attached to its lower end, a bent rod d connecting
the two in such manner as to cause each to move simultaneously in opposite
directions, and a stop e, substantially as described and shewn.
Dated this 24th day of February 1900.
WILLIAM J. MUNDEN,
75, Chancery Lane, Agent for Applicant.