Improvements in Railway Signal Lamps.
Year: 1893

page_text: Date of Application, 24th Apr., 1893
Complete Specification Left, 24th Jan., 1894-Accepted, 24th Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in Railway Signal Lamps.
I GEORGE WILLIAM HUTCHINSON, of 12 Cambridge Road, South Norwood,
in the County of Surrey, Engineer, do hereby declare the nature of this invention
to be as follows:-
This invention for improvements in railway signal lamps has for its object to
enable the lenses of railway signal lamps and the spectacle glasses of the signals to
be easily cleaned without lowering the signal arm and to enable broken or damaged
lenses to be immediately removed and replaced by new ones without skilled labour
and without affecting the body of the lamp; and consists essentially in securing
the lens of a railway signal lamp in a separate frame adapted to slide in and fit into
a corresponding frame secured to the lamp body. The lens can thus readily be
removed with its frame for cleaning and when applied to an ordinary semaphore
signal lamp it enables the inner side of the spectacles to be easily cleaned on
removing the lens and its frame. The back lens can be fitted similarly to the
front lens.
Dated this 22nd day of April 1893.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Railway Signal Lamps.
I, GEORGE WILLIAM HUTCHINSON of 12 Cambridge Road, South Norwood,
in the County of Surrey, 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 :-
This invention for improvements in railway signal lamps has for its object to
enable the lenses of railway signal lamps and the spectacle glasses of the signals
to be easily cleaned without lowering the signal arm and to enable broken or
damaged lenses to be immediately removed and replaced by new ones without
skilled labour and without affecting the body of the lamp; and consists essentially
in securing the lens of a railway signal lamp in a separate frame adapted to slide
in and fit into a corresponding frame connected to the lamp body. The lens can
thus readily be removed with its frame for cleaning, and when applied to an
ordinary semaphore signal lamp such removal facilitates the cleaning of the inner
side of the spectacle glasses. The back lens can be fitted similarly to the
front lens.
In the accompanying two sheets of drawings
Fig. 1 is a side elevation of a signal lamp constructed according to this invention
and Fig 2 is a front elevation of the same."
Figs. 3 and 4 are part side and front elevations respectively of a modified form
of fastening for securing the lens to the body of the lamp.
The lens a is secured in a frame comprising a hood b attached to the plate c
sliding in guides d secured to the curved plate e, itself free to rotate about the
vertical axis of the lamp in guides. By this means the plate c, and with it the
lens a, may be readily removed from the body of the lamp for cleaning and
repairs.

page_text: g
The back lens is shown as secured to the curved plate a sliding in guides h, but
it will be evident that it may be secured to a removable plate in a similar manner
to the front lens, for cleaning purposes.
In the modified arrangement shown in Figs. 3 and 4 the sliding plate c and
guides (Figs. 1 and 2) are replaced by the plate i having tubular eyes / into
which hooks m, secured in the plate e, are inserted to hold the lens in position the
said hooks being readily passed through slots in the plate i.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. Securing the lenses of railway signal lamps by means of a removable frame
sliding in guides connected to the body of the lamp substantially as described and
for the purpose set forth.
2. The combination of the lens a and removable frame b, c with guides d and
adjustable plate e working in guides f substantially as described.
3. The combination of lens a hood b plate c and guides d secured to the body of
the lamp substantially as described.
4. Securing the lens to the body of the lamp by hook and eyes substantially as
described with reference to Figs. 3 and 4 of the drawings.
5. The arrangement and construction of railway signal lamps substantially as
described with reference to the drawings.
Dated this 24th day of January 1894.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.