IMPROVEMENTS IN JOINTS FOR THE PLATES OF SAFES AND STRONG ROOMS
Year: 1884

page_text: I, ARCHIBALD DOUGLAS BRYCE-DOUGLAS of Seafield, Ardrossan in the County
of Ayrshire, Engineer, do heroby declare the nature of my Invention for
"IMPROVEMENTS IN JOINTS FOR THE PLATES OF SAFES AND STRONG ROOMS" to
be as follows:-
According to my Invention, I effect the jointing of plates for safes and strong
rooms by rebating the overlapping edges of the plates so that they form a flush
surface, the outer edge of each rebate being bevilled and made to fit against the
correspondingly undercut shoulder of the other rebato, so that the plates are thus
effectually keyed into oach other.
For the corners, the one plate is made with a dovetail rebated edge which fits
into a correspondingly dovetail or undercut groove in the other plate. For fitting
such plates together it is necessary to slide them longitudinally upon each other,
and in order to prevent having thus to slide them the whole length of the plate,
I prefer to cut away the bevil of the outer edge or of the shoulder at intervals so
that the plates can be dropped into each other and then be slid only a small
distance upon each other in order to make the bevils or dovetails engage with each
other.
Fig. 1 of the Drawings shews a section of one arrangement of the above
described mode of jointing the plates.
A A' are the plates having rebated ends a a¹ each fitting with a bevilled edge
against the undercut shoulder of the other plate. The joint may be secured either
by outer and inner straps B B' or only by an outer tee bar C, as shewn at Figs. 2
and 3, screwed and rivetted thereto, the overlapping edges of the joint being also
secured together by rivets D. Figs. 4, 5 and 6 shew two modifications of the mode
of forming the dovetail joint at the corners. At Figs. 4 and 5 the edge of the
one plate is rebated and formed with a dovetail surface e, and fits into the
correspondingly dovetailed or undercut groove f of the other plate F.
The bevils of the edge and groove are cut away at intervals from x to y, as
shewn at Fig. 5, for the purpose above stated. At Fig. 6, the edge e of is
bevilled in both directions and fits into a corresponding angular groove f of the
plate F.

page_text: In the above arrangements, in order to enable the last or closing plates to be got
into place and yet retain the safety joint, the overlapping parts or tongues are made
as shewn at Figs. 7 and 8, so that they can be dropped into position, after which
the spaces between the bevilled surfaces are filled with slips G G of hardened steel..
In the arrangement shewn at Figs. 4 and 5 for forming the dovetail joint, instead
of forming the dovetail as part of the plate, it may be formed as a separate piece
keyed in as shewn at H Fig. 9.
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 =
1. Constructing the joints of plates with rebated and bevilled or undercut edges
so as to lock into each other substantially_as herein described.
2. Constructing the angular joints of plates with a rebated and bevilled edge or
dovetail tongue on the one plate fitting into a correspondingly shaped groove in the
other plate substantially as herein described.
3. u combination with the construction of joints referred to in the preceding
claims, the use of steel slips, such as G Figs. 7 and 8 for securing the closing plates,
substantially as herein described.
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