Improvements in Hot Journal-box Detectors.
Year: 1893

page_text: COMPLETE SPECIFICATION.
[Communicated from abroad by THE KERR THREAD COMPANY, a corporation
organized under the laws of the State of New Jersey, and having its office
at Newark, in the said State of New Jersey, United States of America.]
Improvements in Hot Journal-box Detectors.
I ALFRED VINCENT NEWTON of the Office for Patents, 6 Bream's Buildings,
Chancery Lane in the County of London, Patent Agent, do hereby declare
the nature of this invention and in what manner the same is to be performed
to be particularly described and ascertained in and by the following statement:-
This invention relates to improvements in hot-box detectors, in which an alarm
is operated by the expansion of a part subjected to the heat developed by a journal
operating in its bearing.
The accompanying drawings represent a journal and journal box with the
detector in operative position relative thereto.
This invention is illustrated by an electric alarm circuit adapted to be closed by
the expansion of the mercury confined in a tube seated within a journal box, in
position to render it sensitive to the heat which may be generated by the journal
rotating therein.
upon
The half sections of the journal box are denoted by A and A'. The journal,
which may be the journal of line shafting, a car wheel journal, or other well known
type of journal, is denoted by B. Within a recess a formed in the section A of
the journal box, close beneath the journal, where it hears with greatest force
the box, there is located a tube C, provided with a bulb c, and containing
mercury D. The tube C may be of glass, and sealed after the manner of an
ordinary thermometer tube. I have shown the tube, in the present instance, as
curved to conform to the bearing face of the half section.
Contact pieces E and E are located at intervals along the tube, and extend
through its wall into position to make contact with the mercury therein, when the
latter travels along up the tube. One of the contact pieces, E, for example, may
be permanently in contact with the mercury, if so desired.
Electric conductors F and F¹ extend from the contact pieces E and E¹ to a
signal G and battery H, the circuit being complete through the battery and signal,
whenever the contact pieces E and E' are electrically connected. The signal G
and battery H may be located wherever it is found most desirable.
The contact piece E¹ is so located with respect to the top of the column of
mercury within the tube C, that the said column of mercury will reach the contact
piece E', whenever the temperature of the journal box shall have reached a degree
so high as to threaten danger. The moment the mercury reaches the contact
piece E', the circuit will be completed through the signal, and the signal will
operate to warn the person in charge, of the existence of a "hot box."
It is obvious that numerous slight changes may be made in the form and
arrangement of the several parts, without departing from the spirit and scope of
this invention; hence it is not desired to limit it strictly to the construction herein
set forth.
Having now particularly described and ascertained the nature of the said inven-
tion, as communicated to me by my foreign correspondents, and in what manner the
same is to be performed, I declare that what I claim is :-
The combination with a journal box and a signal, of a part free to expand under

page_text: the influence of heat generated in the box, and a connection between the expansible
part and the signal, when the said part expands, substantially as set forth.
Dated this 19th day of April 1893.
NEWTON & SON,
Agents for the Applicant.