and to other Purposes.
Year: 1885

page_text: and to other Purposes.
We, GEORGE HARRISON BOLTON of Widnes in the County of Lancaster,
Chemical Manufacturer and JOSEPH LEATHWOOD of Runcorn in the County of
Chester, Employé at Chemical Works respectively do hereby declare the nature
of this invention to be as follows:-
This invention has for its object an application of the screw principle for
securing lids of caustic drums and covers of other hand or filling holes in metallic
packages or structures, especially those which after being once closed are not
required to be re-opened, except perhaps once and finally.
•
The invention consists in forming the lid of a plate having an annular flange
projecting from it formed as a single turn of a screw, separated from the plate by
a circular groove into which the cut of the screw runs, the bottom of the groove
being just big enough to lie in the circular hole in the drum head or other package
or structure. A cut is made radially from the hole in the head, and one side of the
cut depressed, and the other elevated. In securing the lid in place the terminal
point of the screw thread is admitted at the cut and the thread screwed in till the
edges of the hole lie entirely in the aunular cut, when it will be found that the
edges of the cut have been brought together and lie level with the rest of, the head,
but exert a pressure against the sides of the circular groove tending to keep the lid
from coming off. In cases where the lid has to be taken off again,
arrange the
groove with a slight depression opposite the opening into the screw thread, so that
the cut shall be guided into the thread.
T
1
100K
WP. THOMPSON & Co.,
Agents for the Applicants.

page_text: and to other Purposes.
We, GEORGE HARRISON BOLTON of Widnes in the County of Lancaster,
Chemical Manufacturer and JOSEPH LEATHWOOD, of Runcorn in the County of
Chester, Employé at Chemical Works respectively do hereby declare the nature
of this invention and in what manner the same is to be performed, to be parti-
cularly described and ascertained in and by the following statement:--
This invention has for its object an application of the screw principle for
securing lids of caustic drums and covers of other hand or filling holes in metallic
packages or structures, especially those which after being once closed are not
required to be re-opened, except perhaps once and finally.
The invention consists in forming the lid of a plate having an annular flange
projecting from it formed as a single turn of a screw, separated from the plate by
a circular groove into which the cut of the screw runs, the bottom of the groove.
being just big enough to lie in the circular hole in the drum head or other package
or structure. A cut is made radially from the hole in the head, and one side of the
cut depressed and the other elevated. In securing the lid in place the terminal
point of the screw thread is admitted at the cut and the thread screwed in till
the edges of the hole lie entirely in the annular cut, when it will be found that the
edges of the cut have been brought together and lie level with the rest of the head,
but exert a pressure against the sides of the circular groove tending to keep the
lid from coming off. In cases where the lid has to be taken off again, I arrange
the grooves with a slight depression opposite the opening into the screw thread, so
that the cut shall be guided into the thread.
Referring to drawing,
Figure 1. shows a plan, and Figure 2 a side view of the lid made in accordance
with my invention, and in actual use at Chemical Works in South Lancashire.
Figure 3 plan and Figures 4 and 5 sectional views of drum head at the orifice
into which the lid fits.
This mode of attaching lids can be applied to other thin sheet iron and other thiu
flexible metallic drums, tanks or boxes.
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
The manufacture and use of lids applicable to caustic soda drum heads and to
other purposes, in which the lid is formed with a screw thread on the part
entering the head, and the head is cut and the edge turned up at one side of the
cut, so as to enable the point of the screw thread to enter the cut, substantially as
and for the purposes described.