IMPROVEMENTS IN LOCKING DEVICES FOR VESSELS CONTAINING MILK AND OTHER LIQUIDS."
Year: 1882

page_text: LETTERS PATENT to Carl Bolle, of Berlin, German Empire, for an invention
of "IMPROVEMENTS IN LOCKING DEVICES FOR VESSELS CONTAINING MILK AND
OTHER LIQUIDS."
PROVISIONAL SPECIFICATION left by the said Carl Bolle at the Once or
the Commissioners of Patents on the 1st March 1882.
CARL BOLLE of Berlin, German Empire
IMPROVEMENTS IN LOCKING DEVICES
FOR VESSELS CONTAINING MILK AND OTHER LIQUIDS."
My invention relates to a simple, safe, and easily manipulated fastening for the
lids of receptacles or vessels for liquids (especially milkcans).
A handle or bridgepiece is, by means of a bolt or equivalent jointed to a hinge-
piece on the upper part of the can or other vessel. The bridgepiece is rigidly attached
to the coneshaped lid of the can by soldering or otherwise so that when the bridge-
piece is rotated around the aforesaid bolt the lid will turn together therewith and
thus the can can be opened or closed.
Around the upper outwardly projecting rim of the lid an indiarubber ring is
placed. This ring closes upon the upper rim of the can and can be pressed
against the same (so as to be perfectly fast and tight) by means of the fastening
hereinafter described. The free end of the bridgepiece opposite to the hingepiece
of the can, is jointed to a latch by means of a bolt in the lower end of the latch a
pin is mounted and free to rotate. The external part of the pin is surrounded by a
barrel fixed upon the latch whilst the opposite part of the pin is firmly connected
with a cam.
The cam can therefore be brought into various positions by turning
the pin. This turning is effected by a special key exactly fitting that part of the
pin which is surrounded by the barrel herein before referred to. Opposite to the
hereinabove mentioned hinge piece a holder is fixed on the cam.
In the upper fork
of the same, the bridgepiece of the lid engages from above when the can is closed
so that its lateral displacement is prevented. Slightly below said fork the holder
has a book with a nose against which nose the cam is pressed when the pin
CD 31

page_text: rotates towards one side so that by the excentric action of the said cam the lid
is firmly drawn against the upper edge of the can and a perfectly tight closing
is produced by compression of a packing ring of indiarubber or the like on the
lid. Rotation of the latch around its bolt on the bridgepiece is prevented during
this operation by the nose on the hook. When however the pin is turned (in
the direction opposite to that above referred to) by means of the key, the latch
can be rotated around its bolt on the bridgepiece and the can can be opened.
A protecting wall projecting inward, surrounds the pin and cam whereby illicit
shifting of the cam when the can has been closed, (say by means of a pointed
instrument) is prevented so that the fastening can be opened only by means of a
suitable key.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Carl Bolle in the Great Seal Patent Office on the 31st August
1882.
CARL BOLLE of Berlin German Empire
IMPROVEMENTS IN LOCKING DEVICES
FOR VESSELS CONTAINING MILK AND OTHER LIQUIDS."
My invention relates to a simple, safe and easily manipulated fastening for the
lid of receptacles or vessels for liquids, especially milk-cans, and in the accompanying
drawings my fastening is represented in its application to the lid of a milk can.
a is a handle or bridgepiece one end whereof is by means of a bolt a' or
equivalent jointed to a hinge-piece on the upper part of the can or other vessel K.
The bridge piece a is rigidly attached to the cone shaped lid D of the can, by
soldering or otherwise, so that when the bridge-piece is rotated round the aforesaid
bolt a¹ the lid will turn together therewith as illustrated in Figure 3 and thus the
can can be opened or closed.
Round the upper outwardly projecting rim of the lid D an India rubber ring r is
placed, this ring closes upon the upper rim of the can and can be pressed against
the same so as to be perfectly fast and tight by means of the fastening hereinafter
described.
The free end of the bridge piece a, viz: that opposite to the hinge piece of the
can is jointed to a latch b by means of a bolt a¹¹; in the lower end of the latch a
';
pin is mounted and free to rotate. The external part of the pin i is surrounded
by a barrel g fixed upon the latch b whilst the opposite part of the pin is firmly
connected with a projection or cam c. The cam c can therefore be brought into
various positions as shewn in Figures 2 & 3 by turning the pin i. This turning
is effected by a special key 8 shewn in Figure 4 this key fitting that part of the
pin which is surrounded by the barrel g.
Opposite to the hereinabove mentioned hinge piece a holder d is fixed on the
can K: In the upper fork m of the same the bridge-piece a of the lid engages
froin above when the can is closed so that its lateral displacement is prevented.
Slightly below said fork the holder d has a hook h with a nose n (Figures 2 and 3)
against which the cam c is pressed when the pin 7 rotates towards one side so that
by the excentric action of said cam the lid D is firmly drawn against the upper edge
of the can and a perfectly tight closing is produced by compression of the India
rubber ring r in the lid. Rotation of the latch b around its bolt on the bridge
piece a is prevented during the operation by the nose n on the hook h. When
however the pin i is turned (in the direction opposite to that above referred to) by
means of the key S, the cam c assumes the position shown in Figure 3 and the
latch can be rotated around its bolt on the bridge piece a and the can opened.
The pin i has, as is indicated in dotted lines, a protecting wall, projecting inward
and surrounding the cam c whereby illicit shifting of the cam c when the can has
been closed (say by means of a pointed instrument) is prevented, so that the
fastening can be opened only by means of a suitable key.
Having now described the nature of my said invention and the manner of
performing the same, I wish it understood that what I claim and desire to protect
under the hereinbefore in part recited Letters Patent is ;
First The combination of the list of a receptacle with the bridgepiece a capable
of turning round a bolt a¹ and a fastening attached to the other end of the latter
and consisting of the latch b with the pin i and cam c substantially as set forth.
Second: The combination of the herein described lid and fastening with a vessel
for transporting milk and other liquids, on which is fixed a holder & into which
the cam c takes, substantially as set forth.

page_text: Third: A holder & with an upper fork m into which the bridge piece a can take
and provided with the hook h on which there is a nose n which prevents the
slipping back of b when the vessel is closed.
In witness whereof I the said Carl Bolle have hereunto set my hand and seal
this twenty-second day of August in the year of Our Lord One thousand
eight hundred and eighty two.