Magnetic Fastening for Safety Lamps and the like.
Year: 1893

page_text: Date of Application, 30th June, 1893-Accepted, 5th Aug., 1893
COMPLETE SPECIFICATION.
Magnetic Fastening for Safety Lamps and the like.
I, HEINRICH FREISE, Engineer, of Hamme, near Bochum, in the Kingdom of
Prussia, German Empire, 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 :-
The present invention consists of a fastening for safety lamps, and the like,
which can only be opened by means of two magnets. The fastening consists of a
cylinder closed at both ends and divided at the middle, the upper half being
attached to the door of the lamp and the other, lower half, to the casing or
vice versa; inside the cylinder is arranged a longitudinally divided cylindrical body,
preferably rounded at the top to the form of a bullet. This body is not divided
longitudinally along its entire length, but the two ends remain whole, the upper
end being in one piece with one half of the split cylindrical part, the lower end
with the other half. The two halves are kept normally closed in the centre of the
cylindrical casing by a spring arranged underneath the lower part, thus holding the
lantern securely closed. On applying a magnet at each end of the cylinder the two
halves of the bullet-shaped body will be drawn apart one upwards and the other
downwards and the lamp or lantern may be opened, when the lamp is again closed
and the magnets removed the lower part of the body will be pushed up by its spring
and the upper part will fall into place by the action of gravity, thus securely
fastening together the two parts of the lamp.
In order to make this Specification more easily intelligible, reference is had to
the accompanying drawings in which similar letters denote similar parts throughout
the several views.
Fig. 1 being a sectional elevation of the fastening when the lamp is closed, and
Fig. 2 a similar section with the parts separated by means of the magnets.
Fig. 3 is a sectional plan.
In this
G represents the line of division of the two parts of the lamp, e is a cylindrical
casing, the upper part R of which is attached to one part of the lamp, the lower
part R₁ to the other part, the whole casing being advantageously of brass.
casing is arranged the divided bullet-shaped body A, B, having its upper end K as
also its lower end C of wrought iron, whilst the central cylindrical part is
advantageously of brass. The lower part of the body A, B, is normally held in
the middle of the casing e by a spring F, the upper part A falling into position on
the lower by gravity. On applying a magnet at each end of the casing e the two
parts A and B will be brought into the positions shown in Fig. 2, and the lantern
may be opened. The lower part B is drawn down against the pressure of its
spring, which will act to push it up as soon as the magnet is removed.
The body A, B, is bored out at i in order to render it more difficult to open the
fastening by inserting fine wires between the parts.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is performed, I declare that what 1
claim is :-
A fastening for safety lamps and the like to be operated by the aid of magnets,
substantially as described and illustrated in the accompanying drawings and for the
purpose specified.
Dated this
CASTLE SMITH,
" Invention
"
Office, 54, Fleet Street, London, E.C.,
Agent for the Applicant.