Improvement in the Method of Rivetting Water Ballast Tanks or other Structures Requiring Drain or Ventilation Holes.
Year: 1890

page_text: Date of Application, 27th Dec., 1890
Complete Specification Left, 14th Apr., 1891-4ccepted, 20th June, 1891
PROVISIONAL SPECIFICATION.
Improvement in the Method of Rivetting Water Ballast Tanks or
other Structures Requiring Drain or Ventilation Holes.
I FRANK CLEMENT GOODALL of Northwood House, Richmond, Surrey, Naval
Architect do hereby declare the nature of this invention to be as follows':—
As at present constructed, water ballast tanks have to be fitted with limber holes
in order to drain out the water, but where a comparatively thin layer of cement is
applied which does not reach up to the limber holes, spaces are left between the
frames, keelsons and wash plates to allow the water to drain out. To do this long
slots have to be cut into the root of the angle bars, causing considerable expense.
This method considerably reduces the strength of the vessel as no tie exists where
these holes are cut. In order to avoid this method, and at the same time to provide
a limber hole in the frames and angle bars allowing of the application of a thin
layer of cement, also with a view of applying this method to vessels built of flanged
plates I cut holes one to two inches in diameter into the frames, angle bars, floor
plates and keelsons or into the flanges, and rivet them with a large hollow rivet
which I call a coge as per Figure one.
This style of rivet may also be applied to any other iron or steel structure where
drain holes or ventilating or other small apertures are required, and where at the
same time it is not desirable to incur the local weakness resulting from unprotected
holes or apertures.
I combine with this method a specially adapted tool, one for the holder up, and
one for the rivetter of which I show on Figure two.
A is the part which enters and opens the coge. B B serves to turn over the
flange of the coge and securely rivet same. C serves to hold the tool, D is the part
which is struck by the rivetter, or on which with hydraulic rivetting the pressure
is exercised. A similar tool would be required by the holder up, and the same
could be constructed as the end of a heavy hammer, or both parts could be fitted to
a hydraulic rivetting machine.
Dated this 22nd day of December 1890.
FRANK C. GOODALL.
COMPLETE SPECIFICATION.
Improvement in the Method of Rivetting Water Ballast Tanks or
other Structures Requiring Drain or Ventilation Holes.
I, FRANK CLEMENT GOODALL of Northwood House, King's Road, Richmond,
Surrey, Naval Architect, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
As at present constructed water ballast tanks have to be fitted with limber holes
in order to drain out the water, but where a comparatively thin layer of cement is
applied which does not reach up to the limber holes, spaces are left between the
frames, keelsons and wash plates to allow the water to drain out. To do this, long
slots have to be cut into the root of the angle bars, causing considerable expense.
This method considerably reduces the strength of the vessel as no tie exists where
these holes are cut. In order to avoid this method, and at the same time to provide
a limber hole in the frames and angle bars allowing of the application of a thin
layer of cement, also with a view of applying this method to vessels built of flanged
plates I cut holes one to two inches in diameter into the frames, angle bars, floor
Price 27

page_text: plates and keelsons or into the flanges, and rivet them with a large hollow rivet see
Fig. No. 1 which I call a coge as per drawing.
This style of rivet may also be applied to any other iron or steel structure where
drain holes or ventilating or other small apertures are required, and where at the
same time it is not desirable to incur the local weakness resulting from unprotected
holes or apertures. I combine with this method a specially adapted tool, one for
the holder up, and one for the rivetter of which I show in drawing Fig. No. 2.
A is the part which enters and opens the coge. B B serves to turn over the
flange of the coge, and securely rivet same. C serves to hold the tool. D is the
part which is struck by the rivetter, or on which with hydraulic rivetting the pressure
is exercised. A.similar tool would be required by the holder up and the same could
b. constructed as the end of a heavy hammer, or both parts could be fitted to.a
hydraulic rivetting machine.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed declare that what I
claim is:
1. A. hollow rivet.
2. A. tool suitable for closing same as shown on drawing.
Dated this 10th day of April 1891.
FRANK C. GOODALL.