An Improvement in Joints for Sheet Metal Boxes or Cans, and Apparatus for Making the same.
Year: 1898

page_text: Date of Application, 25th Mar., 1898-Accepted, 9th July, 1898
COMPLETE SPECIFICATION.
An Improvement in Joints for Sheet Metal Boxes or Cans, and
Apparatus for Making the same.
We, ERNEST FEATHERSTONE GRIFFIN, of "Westleigh," Woodside Park, North
Finchley, Middlesex, Factory Manager, and WALTER EDWARD HIGGS, of 27,
Crowndale Road, Camden Town, N.W., Engineer, do hereby declare the nature
of this invention and in what manner the same is to be performed to be particu-
larly described and ascertained in and by the following statement:—
Our invention relates to means of effecting the sound and fluid tight jointing
of the bottom and the top or internal lip of a sheet metal box or can to the side,
and to apparatus for closing and completing the joint as we shall describe
referring to the accompanying drawings.
Fig. is a part section to an enlarged scale of a joint of known form connecting
the lid to the wall of the box or can.
Fig. 2 is a section of the tool with elevation of the roller which we employ
for closing the joint and forming the bead and Fig. 3 is a part section to the
enlarged scale of the joint with bead completed according to our invention.
The known joint shewn in Fig. 1 which is not soldered, is not so fluid tight
as is required, especially when the box or can so jointed is employed for holding
preserved substances to which no air should have access. This want of the
desired tightness probably results from the closing of the joint by rolling which
tends to elongate the outer thicknesses of the metal, and so to enlarge to a
certain extent the space between these and the inner thicknesses. We have
found that by pressing the metal outwards from the inside so as to form a bead b
just under the joint that complete fluid tightness is obtained without requiring
soldering.
We may form this bead by an internal roller or otherwise but we prefer to
form it and at the same time close the joint by employing a tool of the kind
shewn in Fig. 2. It consists of a revolving chuck made in two parts A and B
secured together and a ring R which is free to move radially within certain
limits.
The part A has a projecting rounded nose a for forming the bead.
The joint made in the usual way as shewn in Fig. 1, but it may be before
being quite closed, is introduced between the edge a of the part A and the face r
of the ring R, and while the chuck revolves a roller C is pressed against the
ring causing it to take an eccentric position relatively to A. Thus the joint is
squeezed between the parts and a becoming tightly closed and having the
metal just under the joint pressed outwards by the nose a so as to form a bead b
as shewn in Fig. 3 which effects the closure of the joint in a fluid tight manner.
Having now particularly described and ascertained the nature of this in-
vention and in what manner the same is to be performed, we declare that what
we claim is:-
-
1. A joint for a sheet metal box or can having a bead 6 formed by pressing
outwards the metal iust under the joint. substantially as described.

page_text: 2. For closing and beading the joint a tool constructed and operating sub-
stantially as described.
DJ
1. 1000
ABEL & IMRAY,
Agents for the Applicants.