An Improvement in Electrical Lock and Block Apparatus for Railway Points and Signals.
Year: 1894

page_text: Date of Application, 7th Sept., 1894
Complete Specification Left, 10th May, 1895-Accepted, 15th June, 1895
PROVISIONAL SPECIFICATION.
An Improvement in Electrical Lock and Block Apparatus for
Railway Points and Signals.
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 Specification No. 8331 of 1893 I described an electric lock for a railway
point or signal lever so arranged that the spring catch rod of the lever cannot be
raised except when an electromagnet, fixed beside the lever, on being excited by a
current from a distance, attracts a pawl armature obstructing a shoulder on the
catch rod. According to my present invention, I fix on the catch rod a projecting
tooth which, when the catch rod is down, is engaged in a gab of a vertical slide
projecting from a casing fixed on the lever frame. Within this casing there is an
electromagnet and pawl armature which, when not attracted, acts as a stop to
prevent the slide from rising. When, however, the magnet is excited by an
electric current from a distance, the pawl armature is attracted leaving the slide
free to rise, and the operator can then raise the catch rod, the slide and its gab
rising with it.
While the lever, thus released, is moved away, the slide is kept up
by a spring, presenting its gab ready to receive the tooth of the catch rod when the
lever is brought back, and the catch rod being then depressed, the slide becomes
again locked by the pawl armature.
Dated this 7th day of September 1894.
ABEL & IMRAY,
Agents for the Applicant.
An Improvement in Electrical Lock and Block Apparatus for
Railway Points and Signals.
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 Specification No. 8331 of 1893, 1 described an electric lock for a railway
point or signal lever so arranged that the spring catch rod of the lever cannot be raised
except when an electromagnet, fixed beside the lever, when excited by a current
from a distance, attracts a pawl armature obstructing a shoulder on the catch rod.
My present invention relates to an improved construction of this apparatus, as I
shall describe referring to the accompanying drawings which are sections partly in
elevation, Fig. 1 shewing the catch rod locked down and Fig. 2 shewing it free
and raised.
I fix on the catch rod R a projecting tooth T which, when the catch rod is down,
is engaged in the projecting gab G of a vertical slide S arranged in a casing C
fixed on the lever frame F. Within this casing there is an electromagnet E
having a pawl armature A which, when it is not attracted, acts as a stop against a
shoulder of the slide S and prevents it from rising.

page_text: When, however, the magnet E is excited by an electric current from a distance
the pawl armature A is attracted leaving the slide S free to rise, and the operator
can then raise the catch rod, the slide and its gab rising with it.
While the lever L,
thus released, is moved away, the slide S is kept up by a helical spring presenting
the gab G ready to receive the tooth T of the catch rod when the lever Lis
brought back, and the catch rod R being then depressed, the slide S becomes again
locked by the pawl armature A, which, being no longer attracted by the magnet E
is caused by a weight W on its crank arm to advance and engage again against the
shoulder of the slide S.
In order to prevent transmission of signals which might be inconsistent with the
unlocked condition of the catch rod R, the movement of the crank arm of the pawl
armature A when it is attracted may be arranged, as shewn, by bearing against the
incline I on a contact spring, to break a contact at B in a signalling circuit.
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 the catch rod of a railway point or signal lever, a tooth fixed
on the rod and engaging the gab of a vertical slide which is locked by a pawl
armature bearing against a shoulder of the slide, and an electromaguet which when
excited attracts the pawl armature releasing the slide, substantially as and for the
purpose set forth.
Dated this 10th dex of Mar 1905
ABEL & IMRAY,
Agents for the Applicant.