-GESELLSCHAFT FÜR FEINMECHANIK, vormals JETTER AND SCHEERER
Year: 1897

page_text: A communication by THE ACTIEN-GESELLSCHAFT FÜR FEINMECHANIK, vormals
JETTER AND SCHEERER, of Tuttlingen, Wurtemberg, in the Empire of Germany
Surgical Instrument Makers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool and 6, Bank Street, Manchester, both in
the County of Lancaster, 118, New Street, Birmingham in the County of Warwick,
and 322, High Holborn in the County of Middlesex, Civil Engineer, do hereby declare
the nature of this invention to be as follows:-
This invention relates to an improved syringe which may be taken to pieces and
which is provided with a closed bottomless protective casing, having side apertures.
In this protective casing the glass body or tube is inserted and retained tightly
washered to the former by caps placed over both ends of the protective casing, which
caps are held by means of bevelled or step shaped fastening projections adapted to
engage in hooks on the protective casing forming a kind of bayonet joint. In order
to take the syringe to pieces, it requires at the most a half revolution of the two caps
whereupon all the parts can be conveniently taken apart.
This improved syringe is shown in the accompanying drawings,
Figure 1 being an elevation, and
Figure 2 a longitudinal section ;
Figures 3-12 show various elevations and sections of the metal casing A, and the
two caps or ends D, B, adapted to be removably fixed on the same.
On each end of the closed metal casing A there is formed or fixed a pair of hook
shaped projections a¹ a² adapted to engage over bevelled or step shaped projections.
or ridges and d on the two caps B, D, these projections or ridges running only half
round the casing. Recesses formed at diametrical places between the two bevelled
ridges bb or d d allow the covers or caps B and D to be placed over the
hooks a² and a'. By turning the caps, one cap is pressed against the lower, and the
other against the upper end of the cylinder E. The lower cap B is washered by
means of washer discs, or it may bear directly on the cylinder. In order to cause
the upper cap to fit tightly on to the cylinder, a washer disc e is always employed,
which disc simultaneously also fulfils the object of washering the piston or plunger C,
Figure 2.
The cap
B on the discharge end is tapered towards bottom and slightly bevelled
internally, so that a needle holder L for instance may fit tightly into the cap by being
simply inserted, and be automatically held sufficiently firmly.
When it is not desired to make the syringe capable of being taken to pieces at
the bottom end of the metal casing A, the cap B may be omitted, and the metal
casing A tapered at the bottom and inade somewhat conical in shape, as in the case
of the cap B, to allow of the direct insertion of a needle holder L.
"

page_text: Instead of the caps B and D engaging over the holder or casing A, the former may
also lie in the latter, or even be arranged as flat discs.
The hook shaped projections a¹ and a² may also if preferred be formed on the
caps B and D instead of on the holder or casing A, in which case the ridges b and d
are formed on the holder A.
A
communication by THE ACTIEN-GESELLSCHAFT FÜR FEINMECHANIK, vormals
JETTER AND SCHEERER, of Tuttlingen, Wurtemberg, in the Empire of Germany,
Surgical Instrument Makers.]
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for Foreign
Patent Solicitors, 6 Lord Street, Liverpool, and 6, Bank Street, Manchester both in
the County of Lancaster, 118 New Street, Birmingham in the County of Warwick
and 322 High Holborn in the County of Middlesex, Civil Engineer, 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 an improved syringe which may be taken to pieces and
which is provided with a closed bottomless protective casing, having side apertures.
In this protective casing the glass body or tube is inserted and retained tightly
washered to the former by caps placed over both ends of the protective casing, which
caps are held by means of bevelled or step shaped fastening projections adapted to
engage in hooks on the protective casing forming a kind of bayonet joint. In order
to take the syringe to pieces, it requires at the most a half revolution of the two
caps, whereupon all the parts can be conveniently taken apart.
This improved syringe is shown in the drawings accompanying the provisional
specification,
Figure 1 being an elevation; and
Figure 2, a longitudinal section;
Figures 3-12 show various elevations and sections of the metal casing A, and
the two caps or ends D, B, adapted to be removably fixed on the same.
On each end of the closed metal casing A there is formed or fixed a pair of
hook shaped projections a¹ a² adapted to engage over bevelled or step shaped
projections or ridges b and d on the two caps B, D, these projections or ridges
running only half round the casing. Recesses are left. between the two bevelled
ridges bb or d d to allow the covers or caps B and D to be engaged in the
hooks a² and a¹. By turning the caps, one cap is pressed against the lower and the
other against the upper end of the cylinder E. The lower cap B is washered by 4
means of washer discs, or it may bear directly on the cylinder. In order to cause the
upper cap to fit tightly on to the cylinder, a washer disc e is always employed, which
disc simultaneously also fulfils the object of washering the piston or plunger C,
Figure 2.
The cap B on the discharge end is tapered towards the bottom and slightly 4
bevelled internally, so that a needle holder L for instance may fit tightly into the
cap by being simply inserted, and be automatically held sufficiently firmly.

page_text: When it is not desired to make the syringe capable of being taken to pieces at the
bottom end of the metal casing A, the cap B may be omitted, and the metal casing A
tapered at the bottom and made somewhat conical in shape, as in the case of the
cap B, to allow of the direct insertion of a needle holder L.
Instead of the caps B and D engaging over the holder or casing A, the former may
also lie in the latter, or even be arranged as flat discs.
The hooked shaped projections a¹ and a² may also if preferred be formed on the
caps B and D instead of on the holder or casing A, in which case the ridges b and d
are formed on the holder A.
Another modification is shown in Figures 13 to 15 of the sheet of drawings
accompanying this complete specification, in which in place of the piston or
plunger C (Figure 2) a disc piston may be employed and preferably the one shown
in Figures 13 to 15 which is characterised by a thoroughly tight washering with
slight wear and easy replacement of the washer. In this piston the part c, as
shown on a larger scale in the vertical section of the piston, has the form of a
dish and is screwed on the piston rod C together with a suitably shaped nut c¹. As
the nut c' fits into the disc c, a disc c² of suitable washer material inserted between
these two parts is also bent into dish form when c and c¹ are screwed one against the
other so that its outer edge which effects the washering in the tube E is bent
downwards and naturally gains thereby in power of resistance and stiffness.
screwing up the nut c' more or less tightly the edge of the disc c² may evidently be
forced more or less further downwards and thus the outer diameter of the piston may
be somewhat regulated. Instead of one disc c² several such may be arranged one
over the other.
By
The piston body c may also assume the double dish form shown in Figure 15 so
that two washer discs c² may be employed.
Two nuts c¹ must of course be used in this case as is evident without further
explanation from Figure 15.
In the use of such a disc piston the cap D must have a somewhat altered form.
It is provided with a neck d¹, Figure 13, in which the piston rod C is guided.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to me
by ny foreign correspondent, I declare that what I claim is :-
1. A syringe which may be easily taken to pieces, characterised by the syringe
cylinder (E) being inserted in a protective casing of metal or the like having side
apertures and being held fast and washered in the casing by means of two
caps (B and D) fitted one at each end of the casing, said caps having bevelled or step
shaped projections or ridges (b and d) running round and adapted to engage in hook
shaped projections (a' a²) provided on the casing, whilst in case a needle point is
employed one cap (B) which is outwardly tapering is slightly bevelled in its thinner
internal part so that a needle holder (L) may be tightly fitted by being merely
inserted in the inner tapered end of the cap (B), substantially as herein before
described.
2. A further form of construction of the herein described syringe which may be
taken to pieces, consisting in the lower removable cap (B) being omitted and the
metal casing (A) being instead prolonged downwards, tapered and bevelled internally
in the tapering part for the insertion of a needle substantially as described.
3. In the herein described syringe which may be taken to pieces, the employment
of a disc piston in place of the plunger piston (C), the body of said disc piston being
formed of a dish shaped part (c) and a nut (c¹) fitting in the same between which
parts (c and c¹) a washer disc (c) is inserted in such a way that by screwing together
the two parts of the piston (c and c¹) the washer dise (c²) is given a dish shaped
form, that is to say its outer edge is bent downwards whereby the said edge which
produces the tight joint or washering receives a greater stiffness and capability of
resistance substantially as described.
4. A form of construction of the herein described syringe, in which the one

page_text: part (c) of the disc piston (C) has a double dished form so that it can receive a
washer disc (c2) both on its upper and its under surface, which washer discs can be
pressed into the piston body by two nuts c¹ arranged one over each of said washer
discs, substantially as described.