An Improved Device for Injecting Insect and other Powders.
Year: 1893

page_text: Date of Application, 6th Dec., 1893-Accepted, 6th Jan., 1894
An Improved Device for Injecting Insect and other Powders.
A communication by THEODOR NÄGELE, of Ziegelstrasse, Göppingen, in the
Empire of Germany.
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, and 323, 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 has for its object to produce an extremely cheap and handy
appliance for injecting insect and other powder, which may at the same time serve
as a small holder for keeping the powder, and the cost of which is so small that
such an injector may be procured and used by any one.
This device consists of a closed air-tight receptacle hereinafter called a bag, of
paper or the like, which runs to a point at the front and is filled with the powder
to be injected, and which has at its point, for the purpose of shooting out the
powder, a small opening, or, at this point, a'thin tube of straw, paper or the like
may be inserted. The ejection of the powder is brought about by means of a
curved domed spring arranged in the interior of the bag, which is fastened at one
end to a plate, whilst the other free end is directed towards the point of the bag.
In order to prevent the powder penetrating between the spring and plate, and thus
preventing the spring acting, the spring and plate are covered with paper, linen, or
other suitable material. If the curved spring be depressed by pressure applied
at a suitable point on the outside of the bag, the air inside the covering of the
spring is compressed, and is driven between spring plate and spring at the free end
of the latter towards the point of the bag, so that a portion of the air carrying
with it some of the powder is ejected through the opening in the point of
the bag.
On the accompanying drawing, this improved injecting device is shown in
Figures 1, 2, 3 and 4, the two former being elevations and the two latter longitudinal
and cross sections respectively.
The bag A is preferably triangular in form (its shape before being folded being
shown in dotted lines in Figure 2) and a small tube a is inserted at the point of the
bag. The spring B is fastened at one end to the spring plate C, and a covering d
of paper, linen or the like is placed round B and C, which covering leaves free
the loose end of the spring B, which (end) rests on the plate C, in such a way that
air can escape from between B and C, but no powder can penetrate into the
cover d.
If
With the object of producing a jerky ejection of the powder, the spring B is
made of a dome shape, that is to say, its cross section has the form of a bow.
the curved spring be pressed down until its centre touches the plate C before it
reaches this position, the outwardly curved spring will be curved inwardly. During
this reversal of the curve of the spring, a rapid compressing action takes place,
which causes a sudden and sharp ejection of powder to take place.
On the pressure being taken off, the spring returns to its normal position.
Both the curve of the spring, as well as the covering of the spring and spring
plate may, if desired, be dispensed with, but, in that case, the action of the ejection
is less effective.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
An improved device for injecting insect and other powder, consisting of an air-
tight receptacle of paper or the like containing the powder, the said receptacle
running to a point and having at the point a small discharge opening or tube, also
a curved spring and plate both of which have a covering of suitable material,
which are inserted in the receptacle, whereby, when pressed down, a jerky ejection
of the powder from the bag is caused, substantially as described and shown on the
accompanying drawing.
Dated this 5th day of December 1893.
WM. P. THOMPSON & Co.,
Agents for the Applicant.