Case for Displaying Charts and other similar Objects, specially applicable for Displaying Charts on Board Ship.
Year: 1892

page_text: Date of Application, 4th May, 1892-Accepted, 25th June, 1892
COMPLETE SPECIFICATION.
Case for Displaying Charts and other similar Objects, specially
applicable for Displaying Charts on Board Ship.
I, PETER JENSEN of 77 Chancery Lane in the County of Middlesex, Chartered
Patent Agent do hereby declare the nature of this invention (a communication to
me from abroad by Thorvald Beyer of Bergen, Norway, Merchant) and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
At present charts used on board ship are generally kept in the cabin so that the
officer or pilot directing the course of the ship cannot inspect the charts without
leaving his post. This circumstance is of course a danger to the safety of the
navigation and chart cases to be placed on deck have therefore been constructed,
provided with a glass-plate under which the charts are displayed, which are laid
one on the top of the other in the case and when the chart nearest to the glass-
plate has been used, it is taken away and put underneath the other charts. This
changing of the charts is however difficult and in rough weather quite impossible
from which reason the said kind of chart cases or tables has not been generally
adopted.
To avoid these difficulties the present invention provides for a chart case in
which the charts may be kept in a safe manner and in which any required chart or
part of a chart may be displayed under the glass-plate forming the cover of the
case without being taken out of the case or without opening the case. According
to this invention the charts constituting the entire route of navigation are glued or
otherwise fastened together so as to form a continuous strip and the ends of this con-
tinuous chart are secured to two drums or rolls arranged in the case parallel to the
glass covering plate of the same and coiled upon or rolled around these rolls or drums;
by turning these drums one way or the other any one of the charts or parts of the
same may be displayed under the glass. In this manner the officer in charge of
the ship is able, while remaining at his post always to have any required chart or
part of a chart before his eyes and that even when the weather is stormy with
rain or snow.
A chart case or box constructed according to this invention is illustrated in the
annexed drawing, Figure 1 being a cross section of the same and Figure 2 a hori-
zontal section.
A and B are the rolls or drums to which the ends of the continuous chart are
secured and on which the chart is coiled. The rolls are journalled in the case K
that is provided with a glass cover L which fits water-tight. R and S are guide
rolls over which the chart runs and Q is a plate or table close up to the glass
cover serving as a rest for the chart. When the drum A is turned to the left the
chart will be wound off the right hand drum and vice versa. The shafts A & B are
provided with cranks or handles k and I and m and n are ratchet wheels in which the
pawls o and p gear. If the chart is to be moved to the left, the pawl p has to be
held up from the ratchet wheel; if the chart is to be moved the opposite way the
other pawl has to be lifted. u and v are stop levers for holding one or other of
the pawls out of gear. Of course these mechanical arrangements may be con-
structed in various ways without departing from this invention. The invention is
also applicable to the inspection and preservation of other articles such as rare
manuscripts prints or drawings.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
1 A ease
or box capable of being made watertight or airtight for displaying

page_text: charts and other objects such case being provided with a glass cover and with two
drums or rollers on which the chart is coiled and with a crank handle on each
roller for turning the drums round in one direction or the other whereby any part
of the chart may be made visible underneath the glass and that without opening
the case, substantially as set forth.
2. A case or box capable of being made watertight or airtight for displaying
charts or other objects such case being provided with a glass cover and with two
drums A and B on which the chart is coiled and on which crank handles k and l
are mounted for turning the drums round in one direction or the other, rollers R
and S and a plate Q being provided for guiding and supporting the chart, and
ratchet gear for retaining it in position.
1
1000
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.