IMPROVEMENTS IN GAS LAMPS AND OTHER LAMPS
Year: 1870

page_text: PROVISIONAL SPECIFICATION left by Frederick Gray, at the Office
of the Commissioners of Patents, with his Petition, on the 26th
August 1870.
I, FREDERICK GRAY, of Birmingham, in the County of Warwick,
Manufacturer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN GAS LAMPS AND OTHER LAMPS," to be as follows:-
My Invention consists of the improvements herein-after described in
supporting and fixing the shades, globes, or glasses of gas and other
lamps whereby the shade, globe, or glass may be removed from and
replaced on the lamp with great facility.
My improvements are especially applicable to gas and other lamps for
lighting halls and vestibules, but are also applicable to lamps for other
purposes. I will describe my Invention as applied to a hall lamp.
Instead of supporting the shade, globe, or glass upon a fixed gallery or
framework, I support the said shade, globe, or glass upon-a collapsible
gallery, or gallery the diameter of which is capable of being diminished.
I construct the said collapsible gallery as follows:-To the central tube
of the hall lamp below the burner three (or more) arms or levers are

page_text: .
jointed. These arms or levers are situated in the direction of radii, and
near each of their outer or free ends is a vertical peg or stud. The said
arms or levers are not jointed directly to the tube of the lamp but to
brackets projecting from the said tube. On these brackets snugs are
made, against which the inner ends of the jointed arms or levers bear.
The said arms or levers of the gallery are so jointed that when at liberty
to move they take by their own weight a horizontal position, the said
arms or levers being prevented from taking a position lower than a
horizontal one by means of the snugs described on the brackets, against
which the inner ends of the said arms or levers bear. The said arms or
levers are however capable of an upward motion, so as to bring their
outer ends nearer to one another. The lower opening in the lamp
shade, globe, or glass is of a diameter proper to fit outside the pegs or
studs, near the outer ends of the arms or levers constituting the gallery
when the said gallery is in its lowest or normal position. In order to
place the shade, globe, or glass on the gallery it is necessary to raise
vertically the arms or levers of the gallery until the diameter of the said
gallery is less than that of the opening in the shade, globe, or glass.
This is effected by placing the shade, globe, or glass on the under side of
the arms or levers of the gallery and lifting it vertically. The said arms
or levers are thereby raised and their outer ends approach one another.
As soon as the shade, globe, or glass escapes from the arms or levers the
latter fall into a horizontal position, and on lowering the shade, globe, or
glass it rests on and is supported by the gallery. When in this position
the bottom of the globe or shade rests on those parts of the arms or
levers external to the pegs or studs, while the inner side of the bottom
bears against the said pegs or studs, and prevents the shade, globe, or
glass falling from the gallery. No fastening is thus required. To
remove the shade, globe, or glass from the gallery the arms or levers
are raised by the hand, and the shade, globe, or glass passed over the
collapsed gallery.