IMPROVEMENTS IN CAUSTIC HOLDERS OR CASES
Year: 1881

page_text: LETTERS PATENT to George Frederick Redfern, of the General Patent Office,
4, South Street, Finsbury, in the County of Middlesex, Patent Agent, for an
Invention of "IMPROVEMENTS IN CAUSTIC HOLDERS OR CASES." A commu-
nication from abroad by Monsieur A. Barthélémy Clarin, of Paris, in the
Republic of France.
PROVISIONAL SPECIFICATION left by the said George Frederick Redfern
at the Office of the Commissioners of Patents on the 6th July 1881.
GEORGE FREDERICK REDFERN, of the General Patent Office, 4, South Street,
Finsbury, in the County of Middlesex, Patent Agent. "IMPROVEMENTS IN
CAUSTIC HOLDERS OR CASES." [A communication from abroad by A. Barthélémy
Clarin, of Paris, in the Republic of France.]
The Invention communicated to me relates to improvements in the combination
and construction of caustic cases or holders of all kinds, the improvements having
for object to do away with the present cases or holders having metal pincers,
because these pincers are generally badly made and hold the caustic in an
inferior manner, in addition to which they are badly set in their holders and soon
become corroded from contact with the caustic. The improvements have also for
object to replace the wooden cases or holders now employed, which small instruments
are very defective; the caustic is fixed thereto by means of gum-lac, glue, or rosin,
which soon become deliquescent from the deliquescence of the caustic itself which
escapes directly it becomes moistened, thereby necessitating frequent and expensive
renewals.
The improved caustic cases or holders constructed according to this Invention
possess none of the disadvantages herein before described, but are simple, strong, and
cheap; the caustic is fixed without glue and without pincers by a simple method
of adjusting resulting from the conical shape employed, and from a peculiar
construction of head or cap preventing it coming out of its socket.
The improved caustic cases or holders possess further the advantage that they.

page_text: may be made of any size and of any material, such as wood, bone, horn, ivory, or
metal, the principle of construction remaining the same in all cases.
According to this Invention the improved caustic-case or holder is constructed of
a hollow cylinder having a screw on its outer surface so as to suit it for cases of
various kinds; the caustic is made in the form of a cone and is driven into the
cylinder and consolidated by means of a conical tubular holder forced into the
cylinder; the cylinder is then screwed into a tubular handle screwed internally,
and the cover (which with the handle form a case) is then screwed on the other
end of the cylinder.
In some cases the caustic is cast in a mould constructed so as to form it with a
flange or collar at one end, in which case the tubular holder is formed of a suitable
shape to receive the caustic and allow of it being driven into the cylinder
constructed to receive it, the cylinder being then screwed into the handle at one
end, the cover being screwed over the other end of the cylinder so as to form a
complete case or holder.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Frederick Redfern in the Great Seal Patent Office on the
17th December 1881.
•
GEORGE FREDERICK REDFERN, of the General Patent Office, 4, South Street,
Finsbury, in the County of Middlesex, Patent Agent. "IMPROVEMENTS IN
CAUSTIC HOLDERS OR CASES." (A communication from abroad by A. Barthélémy
Clarin, of Paris, in the Republic of France.)
The Invention communicated to me relates to improvements in the combination
and construction of caustic cases or holders of all kinds, the improvements having
for object to do away with the present cases or holders having metal pincers,
because these pincers are generally badly made and hold the caustic in an inferior
manner, in addition to which they are generally badly set in their holders and soon
become corroded from contact with the caustic. The improvements have also for
object to replace the wooden cases or holders now employed, which small instru-
ments are very defective; the caustic is fixed thereto by means of gum-lac, glue,
or rosin, which soon become deliquescent from the deliquescence of the caustic
itself which escapes directly it becomes moistened, thereby necessitating frequent
and expensive renewals.
The improved caustic cases or holders constructed according to this Invention
present none of the disadvantages hereinbefore described, but are simple, strong,
and cheap; the caustic is fixed without glue and without pincers by a simple
method of adjusting resulting from the conical shape employed, and from a peculiar
construction of head or cap preventing it coming out of its socket.
The improved caustic cases or holders possess further the advantage, that they
may be made of any size and of any material, such as wood, bone, horn, ivory, or
metal, the principle of construction remaining the same in all cases.
But to make the Invention communicated to me better understood, I will
proceed to describe the same by reference to the accompanying Drawing, in
the several Figures of which similar letters represent similar or corresponding
parts.
One arrangement for carrying out this Invention is shewn in Figures 1 to 6, and
in this arrangement the improved caustic cases or holders are constructed of a
hollow cylinder a, shewn in side elevation at Figure 1, having a screw thread on
its outer circumference, as shewn, so as to suit it for cases of various kinds; the
caustic b, shewn in detached view at Figure 2, is made in the form of a cone, as
shewn, and is driven into the cylinder a, and firmly held by means of a conical
plug c, shewn detached in Figure 3, which plug is forced into the cylinder a; the
cylinder is then screwed into a tubular handle d, shewn in elevation at Figure 4,
which is screw threaded internally to receive it, and the cover e, shewn in elevation
at Figure 5 (which with the handle & forms a case) is then screwed on the other
end of the cylinder a, the holder and caustic being then complete, as shewn in the
sectional elevation, Figure 6.
In the arrangement shewn in Figures 7 to 11 the caustic b is cast or formed in a
mould constructed so as to form it with a flange or collar b¹ at one end, as shewn
in detached side elevation at Figure 7, in which case the tubular holder a, shewn
in side elevation at Figure 8, is made of a form to receive the caustic, and has a
screw thread in its interior to allow of it being screwed on the screwed part ƒ of
the handle d, constructed as shewn in side elevation, Figure 9; the cover e repre-
sented in side elevation, Figure 10, is then screwed over the part g of the handle d
so as to form a complete case or holder, as seen in sectional side elevation at
Figure 11.

page_text: Having thus described the Invention communicated to me, and the best means I
am acquainted with for carrying the same into effect, I wish it to be understood
that the details as well as the form and dimensions herein laid down and shewn in
the Drawing may be varied without departing from the peculiar character of the
Invention, but what is claimed and intended to be protected by the herein in part
recited Letters Patent is,-
The manufacture and use of caustic holders or cases, constructed substantially
as hereinbefore described and represented in the accompanying Drawing, or any
mere modification thereof.
In witness whereof, I, the said George Frederick Redfern, have hereto set
my hand and seal, this Seventeenth day of December, in the year of our
Lord One thousand eight hundred and eighty one.