Improvements in Safety Lamps.
Year: 1887

page_text: Date of Application, 3rd Feb., 1887
Specification Accepted, 4th Mar., 1887
Improvements in Safety Lamps.
I JAMES LAIDLER of 82 New Elvet, in the City, and County of Durham, 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:
My Invention consists in providing Safety Lamps with a Lock by means of which
the different parts of the Lamps may be securely locked together.
When the lamp consists of two or more parts (such as in the "Marsant Lamp")
which require to be locked together, I use according to this invention, cams or cranks,
which are fixed or cast on to one of the poles or pillars of the lamp, the pole being
rivetted in such a manner as to allow of its being turned round as shewn at A Fig. 1.
and in Fig. 4.
The pole A is rivetted into rings B and C, in such a manner as to allow it to turn,
and fastened to it or cast on are cams or cranks E and F.
The upper part of the lamp D, is screwed into its position the pole A. being turned
round, thus bringing the upper cam or crank E, into the recesses H, in the upper part
of the lamp and G, into the lower part of the lamp, and the lower crank or cam F,
opposite to the recess in the ring C, the bottom J, is then screwed into its place, the
screw bolt K, is then screwed up into position, passing through the bottom J, through
the ring Con the middle part of the lamp thus locking the bottom J with the middle part
of the lamp at C, then through the crank or cam E, thus locking the bottom and
middle of the lamp, with the top of the lamp D, by preventing the cams or cranks
being moved out of position but I do not limit myself to this particular mode. of
locking as shewn in Fig. 1.
The same arrangement of cam or crank lock as before described can be used for
locking the upper part D of the lamps as shewn in Figs. 2 and 3, where the bottom
crank F, has fixed to it a hinged staple L, which when the bottom is screwed on, passes
over the projection M on the bottom J, through which projection Ma rivet N is
passed, thus locking the bottom J with the middle part of the lamp C, and preventing
the cam E being withdrawn from the recess in the top of the lamp D, and thus locking
the three parts of the lamp together.

page_text: The same arrangement of cam or crank lock as before described can be used for
locking the upper part D of the lamps as shewn in Figs. 5 and 6, where the bottom
crank is brought opposite a projection M. on the bottom J of the lamp and a lead
rivet N passed through them, thus locking the bottom J with the middle of the
lamp C, and preventing the cam being withdrawn from the recess in the top of the
lamp D, and thus locking the three parts of the lamp together.
The cams or cranks may be moved into the various positions for locking the lamps
by means of springs and may be secured as hereintofore described or by a padlock,
screw lock or other suitable means.
The cranks or cams may be made any shape to suit different kinds of lamps.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed I declare that what I claim is :-
Providing Lamps with moveable Cranks or Cams for locking the different parts
together substantially as herein described.
In witness whereof I the said James Laidler, have hereunto set my hand and
seal this second day of February in the year of our Lord, one thousand,
eighth hundred and eighty seven.
JAMES LAIDLER.