Improvements in Apparatus for Ensuring Safety of Traffic on Single Lines of Railway.
Year: 1893

page_text: Date of Application, 20th June, 1893
Complete Specification Left, 14th Mar., 1894-Accepted, 14th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Ensuring Safety of Traffic on Single
Lines of Railway.
I, EDWARD TYER, of Ashwin Street, Dalston, in the County of London,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
In my previous Specifications No. 5928 of 1890, No. 1904 of 1891 and No. 2798
of 1892 I have described apparatus for ensuring safety of traffic on single railway
lines by electrically controlling the issue from a station of a tablet or staff to be
carried by a train to a station beyond, thus providing against the admission of
more than that train to the section of the line extending between the connected
stations.
It sometimes happens that, on Sundays or holidays or throughout the night, a
signal cabin or station such as B, intermediate to two more important stations
such as A and C, is to be passed without stopping, in which case the control of the
tablet or staff issue has to be effected by communications between A and C, all
communication with B being cut off.
My present invention relates to modifications of the apparatus described in my
Specification No. 1904 of 1891 whereby I am enabled to provide for safety of
traffic under the circumstances above mentioned, without confusing the tablets
which should pass between A and B with those which should pass between B and C.
For this purpose, I provide the A and C stations with a set of tablets, differing in
form or dimensions or both, from those usually employed, and at each station I
provide, in addition, a separate apparatus somewhat similar to that described in the
Specification No. 1904 of 1891, but destitute of the electrical signalling and
controlling apparatus. It is provided with two apertures for putting in and taking
out tablets, the one of these apertures suited to the ordinary tablet, the other to
the special tablet for use between A and C. When the intermediate station B is
not to be used, the electrical lines which usually connect it with A and with C are
connected together so as to bring A's usual tablet apparatus into direct communi-
cation with C's.
If now C signals to A, as he would usually do to B, that the line is clear and
gives permission for A to issue a tablet, then A, taking one of the ordinary tablets
out from his ordinary apparatus, passes it through one of the apertures into the
special apparatus, and thus releases the disc of that apparatus one segment of
which carries a number of the special tablets; he can then partly turn the disc so
as to bring one of the special tablets to the other aperture; he takes out this
tablet and gives it to the train to be carried to C. By the partial turn given to
the disc after inserting the ordinary tablet, that tablet is removed from the aperture,
and thus it is impossible for two tablets to be out from the apparatus at the same
time. When C receives the special tablet, he places it in his special apparatus,
releasing its disc so that he can partly turn it and take out one of the usual tablets,
a number of which are carried on a segment of the disc, and by placing this in his
usual apparatus, he puts the electrical connections in condition for again com-
municating with A as before.
In like manner C can issue special tablets to be received by A and dealt with
In a similar manner. By suitable modifications of the discs and apertures, the
pparatus is adapted for the issue and reception of a staff instead of a tablet.
Dated this 20th day of June 1893.
ABEL & IMRAY,
Agents for the Applicant.

page_text: Improvements in Apparatus for Ensuring Safety of Traffic on Single
Lines of Railway.
I, EDWARD TYER, of Ashwin Street, Dalston, in the County of London,
Electrical Engineer, 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 :-
In my previous Specifications No. 5928 of 1890, No. 1904 of 1891 and No. 2798
of 1892 I have described apparatus for ensuring safety of traffic on single
railway lines by electrically controlling the issue from a station of a tablet or staff
to be carried by a train to a station beyond, thus providing against the admission
of more than that train to the section of the line extending between the connected
stations.
It sometimes happens that, on Sundays or holidays or throughout the night, a
signal cabin or station such as B intermediate to two more important stations such
as A and C is to be passed without stopping, in which case the control of the tablet
or staff issue has to be effected by communications between A and C, all commu-
nication with B being cut off.
My present invention relates to modifications of the apparatus described in my
Specification No. 1904 of 1891 whereby I am enabled to provide for safety of
traffic under the circumstances above mentioned, without confusing the tablets
which should pass between A and B with those which should pass between
B and C.
For this purpose I provide the A and C stations with a set of tablets, differing
in form or dimensions or both, from those usually employed, and at each of those
stations provide in addition a separate apparatus somewhat similar to that
described in the Specification No. 1904 of 1891, but destitute of the electrical
signalling and controlling apparatus.
Fig. 1 of the accompanying drawings is a perspective view of this apparatus
suited for tablets of two forms, round R, and square S, as shewn by Figs. 2 and 3.
A plan with cover removed is shewn in Fig. 4 and a vertical sectional elevation
in Fig. 5.
The casing has two apertures for putting in and taking out tablets, the one of
these apertures suited to the ordinary round tablet R the other to the special
tablet, such as the square tablet S, for use between A and C. Each of these
apertures has a hinged lid L which, as in the previous apparatus, when it is opened,
prevents the axis H from being turned. When the intermediate station B is not
to be used, the electrical lines which usually connect it with A and with C are
connected together by any suitable switch so as to bring the usual tablet apparatus
of A into direct communication with that of C.
If now C signals to A, as he would usually do to B, that the line is clear and
gives permission for A. to issue a tablet, then A, taking one of the ordinary
tablets R out from his ordinary apparatus, passes it through the round aperture
into the special apparatus and thus releases the disc D of that apparatus one
segment of which carries a number of the special tablets S. The release is effected
by introducing the round tablet at R¹ Fig. 4 thereby pushing away a spring pawl P
which engages with ratchet teeth r. The operator can then partly turn the disc D
in the direction of the arrow so as to bring one of the special tablets S to the
other aperture; he takes out this tablet and gives it to the train to be carried
to C.
By the partial turn thus given to the disc after inserting the ordinary tablet,
that tablet is removed from the aperture to the position Ŕ Fig. 4, and thus it

page_text: is impossible for two round tablets to be out from the apparatus at the same
time.
When C receives the special tablet S, he places it in his special apparatus at S
Fig. 4 pushing away a pawl P which engages with ratchet teeth s and releasing
its disc so that he can partly turn it in the direction opposite to the arrow and
take out one of the usual tablets R a number of which are carried on a segment
of the disc D and by placing this tablet R in his usual apparatus he puts the
electrical connections in condition for again communicating with A as before.
In like manner C can issue special tablets to be received by A and dealt with in
a similar manner. The shape of the disc D and of the apertures of the casing
might be varied to suit tablets of forms other than those shewn, or the apparatus
might be adapted for the issue and reception of a staff instead of a tablet, each
staff being so shaped that it can enter only one of the apertures.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
In combination with two sets of differently shaped tablets or their equivalents,
apparatus consisting of a disc with two sets of ratchet teeth and a pair of spring
pawls arranged within a casing, having apertures for the tablets, to operate as
herein described.
Dated this 14th day of March 1804
ABEL & IMRAY,
Agents for the Applicant.