Improvements in Syringes.
Year: 1889

page_text: Date of Application, 7th Feb., 1889
Complete Specification Left, 26th Oct., 1889-Accepted, 30th Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Syringes.
I, Dr. MARTIN OVERLACH, of Frankfort-on-the-Main in the Empire of Germany
Physician do hereby declare the nature of this invention to be as follows:-
--
This invention relates to injection and other syringes and comprises improved means
for making a tight joint on the one hand between the syringe cylinder and the injection
nozzle at the front end of the same, and on the other hand between the said cylinder
and the part by which the roar end of the latter is closed and which forms a guide
for the piston-rod.
Owing to the great difficulty in the wholesale manufacture of syringes, of making
the glass cylinders of exactly equal diameters and lengths and forming straight edges
at right angles to the sides of the same, the means heretofore used for forming the
joints between the cylinder fittings and the body of the syringe have the following
serious defects.
The putty or cement for securing the fittings or ends to the glass cylinder will last
only a short time by reason of its contact with the liquids used, and will moreover
prevent the syringe from being completely dismounted for cleaning purposes.
The cutting of a screw thread upon the ends of the glass cylinder renders the latter
very liable to break and the substitution of a broken cylinder by another becomes
very difficult or impossible if there is the slightest inequality in the glass cylinder.
The joint at the nozzle end which is mostly made by means of an impregnated leather
washer or disc usually commences to leak very quickly.
The body of the syringe cannot he hermetically closed by clamping the same
between two end caps or plates connected by metal rods and caused to approach each
other by means of nuts unless the edges or end surfaces of the glass cylinder are
quite straight and at right angles to the sides of the same. This requires accurate
work which is not usually carried on in the wholesale manufacture of syringes.
The syringe constructed according to my invention is designed to obviate the
aforesaid defects which are extremely serious considering the importance of a reliable
and absolutely clean instrument.
By its improved arrangement it enables putty or other binding material to be dis-
pensed with and the end surfaces of the cylinder do not require to be formed straight
and at right angles to the sides of the cylinder. It permits the use of glass tubes
having absolutely flat walls and no threads and obviates the necessity for accurate
equality in the inside width of the cylinder and in the thickness of the wall of the
latter. Furthermore it enables all the parts to be kept thoroughly clean because they
are all exposed to view, and advantageously differs from the syringes hitherto employed
by its great simplicity.
A socket arranged at the rear end of the syringe cylinder serves as a guide for the
piston rod. This socket has at its end extending into the said cylinder a disc and is
provided with a screw thread over which a packing ring and a disc are slid, and with
which engages a cap provided with a female thread. By screwing this can more or
less tightly against the aforesaid disc the packing ring between the latter and the disc
formed on the socket is more or less powerfully compressed. In consequence of
this compression the circumference of the packing ring becomes larger and is
pressed more or less firmly against the inner wall of the cylinder, thereby pro-
ducing a more reliable and tight joint between the guide for the piston rod and
the body of the syringe. In order to further increase the tightness of this joint
the inner wall of the glass cylinder, where it coines in contact with the packing
ring is provided with a groove into which the circumference of the packing ring

page_text: is forced as the latter is compressed. When serewing the cap upon the socket the
smooth glass cylinder is liable to turn in the hand. In order to obviate this
inconvenience the said socket is flattened and the disc which is adapted to slide
upon the same is provided with a bore corresponding in transverse section to the
shape of the socket. By this means the said dise which must be firmly held when
screwing the caps upon the socket is prevented from being carried away with the
latter so that the glass cylinder will not turn in the hand.
The joint at the front end of the syringe cylinder between the latter and the
mozzin is formed in a similar manner as that between rear end of the aforesaid
cylinder and the guide for the piston rod. The nozzle comprises a discharged tube
provided at its end which is inserted into the syringe cylinder with a disc. A serew
thread is formed upon the discharge tube over which an elastic packing ring and a
collar are slid, both these latter part being of a somewhat smaller diameter than the
inside width of the glass eylinder. With the screw thread upon the tubes engages
a female thread provided in a dise which is firmly screwed against the above
mentioned collar so as to compress the packing ring placed between the latter an|
the end dise formed upon the end of the discharge tube. According as the parking
ring is compresso more or less by these means the nuzzle is connected more or less
firmly with the syringe cylinder.
For cleaning the syringe all the parts of the latter can be easily separatal or dis
mounted by simply slackening the aforesaid cap and dise and then removing the
fittings from the extremities of the cylinder.
Datel this 7th day of February 1889.
ILASELTINE, LAKE & Co.,
45, Sonthampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Syringes.
1, MARTIN OVERLACH, of Frankfort. on-the-Main, in the Empire of Germany,
Physician, 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 :—
This invention relates to injection and other syringes and comprises improved
means for making a tight joint on the one hand between the syringe cylinder and the
injection nozzle at the front end of the same, and on the other hand between the said
cylinder and the part by which the rear end of the latter is closed and which forms
a guide for the piston rod.
Owing to the great difficulty, in the wholesale manufacture of syringes, of making
the glass cylinders of exactly equal diameters and lengths and forming straight edges
at right angles to the sides of the same the means heretofore used for forming the
joints between the cylinder fittings and the body of the syringe have the following
serious defoels.
The putty or cement for securing the fittings or ends to the glass cylinder will last
only a short time by reason of its contact with the liquids used and will moreover
prevent the syringe from being completely dismounted for cleaning purposes.
The cutting of a scrow thread upon the ends of the glass cylinder renders the latter
very liable to break and the substitution of a broken cylinder by another becomes
very difficult or impossible if there is the slightest inequality in the glass cylinder.
The joint at the nozzlo end, which is mostly made by means of an impregnated leather
washer or disc usually cominences to leak very quickly.
The body of the syringe cannot be hermetically closed by clamping the saine
between two end caps or plates connected by metal rods and caused to approach each
other by means of nuts, unless the edges or end surfaces of the glass cylinder are
quite straight and at right angles to the sides of the same. This requires accurate
work which is not usually carried on in the wholesale manufacture of syringes.

page_text: The syringe constructed according to my invention is designed to obviate the afore-
said defects which are very serious considering the importance of a reliable and
absolutely clean instrument.
By the improved arrangement putty or other binding material may be dispensed
with, and the end surfaces of the cylinder do not require to be formed straight and at
right angles to the sides of the cylinder. It permits the use of glass tubes having
absolutely flat walls and no threads, and obviates the necessity for accurate equality
in the inside width of the cylinder and in the thickness of the wall of the latter.
Furthermore, it enables all the parts to be kept thoroughly clean because they are all
exposed to view and it has the advantage over the syringes hitherto employed, that it
is exceedingly simple.
In the accompanying drawings,
Figure 1 is a longitudinal section of the improved syringe, and
Figure 2 is a transverse section of the same on the line I Í of Figure 1.
A socket arranged at the rear end of the syringe cylinder serves as a guide for
the piston rod. This socket has at its end extending into the said cylinder a disc e,
and is provided with a screw thread g over which a packing ring d and a disc rare
slid, and with which engages a cap k provided with a female thread. By screwing
this cap more or less tightly against the aforesaid disc the packing ring d between
the latter and the disc e formed on the socket is more or less powerfully compressed.
In consequence of this compression the circumference of the packing ring becomes
larger and is pressed more or loss firmly against the inner wall of the cylinder,
thereby producing a more reliable and at the same time tighter joint between the
guide for the piston rod and the body of the syringe. In order to further increase
the tightness of this joint the inner wall of the glass cylinder, where it comes in
contact with the packing ring, is provided with a groove into which the circumference
of the packing ring is forcod as the latter is compressed. When screwing the cap k
upon the socket the smooth glass cylinder is liable to turn in the hand. In order to
obviate this inconvenience the said socket is flattened as shown in Figure 2 and the
disc which is adapted to slide upon the same is provided with a boro corresponding
in transverse section to the shape of the socket. By this means said disc which
must be firmly held when screwing the caps & upon the socket is prevented from
being carried away with the latter, so that the glass cylinder will not turn in the
hand.
The joint at the front end of the syringe cylinder between the latter and the nozzle
is formed in a similar manner as that between rear end of the aforesaid cvlinder and
the guide for the piston rod. The nozzle comprises a discharge tube" provided at
its end which is inserted into the syringe cylinder with a disc e. A screw thread gl
is formed upon the discharge tube, over which an elastic packing ring d and a collar
are slid, both these latter parts being of a somewhat smaller diameter than the inside
width of the glass cylinder. With the screw thread g' upon the tube engages a
female thread provided in a disc which is firmly screwed against the above-
mentioned collar so as to compress the packing ring d' placed between the latter
and the end disc e formed upon the end of the discharge tube.
According as the packing ring is compressed more or less by these means the nozzle
is connected more or less firmly with the syringe cylinder.
For cleaning the syringe all the parts of the latter can be easily separated or dis-
mounted by simply slackening the aforesaid cap k and disc ' and then removing the
fittings from the extremities of the cylinder.
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
First. In injection and other syringes the arrangement of the piston-rol guide
socket with the terminal disc e arranged within the syringe cylinder, and the screw
thread upon which is arranged the cap k with a suitable female thread whilst between

page_text: the cap and the fixed terminal disc e is arranged a ring adapted to be easily dis-
placed upon the serow-thread, and the packing ring d, so that when the cap is
serewed with more or less power against the ring by reason of the greater or smaller
compression of the ring d by which the latter is pressed against the inner periphery
and into the groove formed in the glass cylinder-the piston-rod guide socket fis
connected more firmly or more loosely with the syringe cylinder.
Second. The arrangement of the discharge tube serving for the injecting nozzle
with the terminal disc e placed within the syringe cylinder, and with the screw
thread g', upon which the disc provided with a suitable female thread is placod,
whilst between the said ise and the fixed terminal disc are placed the ring
adapted to be easily displaced upon the screw thread and the packing-ring d', so that
when the disc & is screwed more or less powerfully against the ring r' by reason of
the greater or smaller compression of the ring d-by which the latter is pressed
against the inner periphery and into the groove formed in the glass cylinder-the
discharge pipe is connected moro firmly or more loosely with the syringe-
cylinder.
B
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.