IMPROVEMENTS IN SHADES FOR LAMPS AND THE LIKE
Year: 1883

page_text: LETTERS PATENT to John Henry Johnson of 47 Lincolns-Inn Fields in the
County of Middlesex, Gentleman, for an Invention of "IMPROVEMENTS IN
SHADES FOR LAMPS AND THE LIKE " Communicated to him from Ernest
Lefebare a person residing at Paris in the Republic of France.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson at
the Office of the Commissioners of Patents on the 4th January 1883.
JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman "IMPROVEMENTS IN SHADES FOR LAMPS AND THE LIKE" a com-
munication to me from Ernest Lefebure a person residing at Paris in the Republic
of France
-
This Invention consists in constructing shades for lamps and the like on the
principle of an umbrella that is to say providing them with a jointed frame
enabling the shade to be opened or expanded and shut or contracted in a similar
manner to an umbrella.
In carrying out this invention the shade is carried by a frame provided with and
supported by two rings or tubes namely a lower ring and an upper ring of
diameters corresponding to the parts of the lamp (or the like) upon which the
shade is to bo supported. To the upper ring are hinged or jointed a series of radial
rods or ribs, these rods or ribs serving to support the material forming the shade-
The said rods or ribs are also connected by a hinge joint preferably at about the.
middle of their length to bars hinged to the lower ring and arranged and operating
in substantially the same manner as the stretchers of an umbrella. By suitably
adjusting the relativo position of the two rings or tubes herein before described the
rods or ribs forming the frame of the shade may be drawn towards the centre in
order to contract to the shade or be opened or expanded to any desired extent as
required.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Henry Johnson in the Great Seal Patent Office on the
19th June 1883.
"
JOHN HENRY JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman "IMPROVEMENTS IN SHADES FOR LAMPS AND THE LIKE a commu-
nication to me from Ernest Lefebure a person residing at Paris in the Republic of
France
This Invention consists in constructing shades for lamps and the like on the
principle of an umbrella that is to say providing them with a jointed frame
enabling the shade to be opened or expanded and shut or contracted in a similar
manner to an umbrella by means of rings sliding upon the chimney of the lamp
as hereinafter described.
And in order that the said Invention may be fully understood I shall now
proceed inore particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 of the accompanying drawings is a vertical section representing the
improved lamp shade in the shut or contracted position and Figure 2 is a similar
view of the shade when open or expanded.
Figure 3 is a vertical section of another arrangement of the rings and frame and
Figure 4 is a detail.
The paper, lace or other fabric or material forming the shade is supported by an
expanding and contracting frame composed of radial rods or ribs A of wood, steel,
whale bone or other suitable material hinged at a to a ring B fitted to the chimney
of the lamp. These rods or ribs are capable of being drawn towards the centre as
shown in figure 1 in order to contract the shade and of being pushed upwards and
outwards so as to open or expand the shade as shown in figure 2 by means of a
ring C also fitted to the chimney of the lamp. This ring in the arrangement
illustrated in figures 1 and 2 acts upon the ribs A by the intervention of bars D
jointed to the ribs A at b and to the ring C at c and acting in a similar manner to
the "stretchers" of an umbrella or parasol. By simply sliding the rings B or C or
both along the chimney towards or away from one another it is evident that the
shade will be instantaneously expanded to its full or any suitable extent or be
contracted to within a relatively small compass when not required for use.
In certain cases such as when applied to lamps for burning petroleum or paraffin
oil for example in which it would be inconvenient to employ a ring in the position
occupied by the ring C in the arrangement illustrated in Figures 1 and 2 the
modification shewn in elevation and plan in Figures 3 and may be employed,
the radial ribs or rods A are operated in an analogous manner to that described
with reference to Figures 1 and 2 by a ring C' provided with a cone or flange D¹.
The ribs A are jointed to a ring B in a manner similar to that described with
reference to figures 1 and 2 and the ring C¹ is provided with angular slots ƒ which
when the rings are brought together in order to expand the shade engage in a
similar manner to a bayonet joint with pins g on the ring B. The ring C' is
provided with springs h which enable it to be firmly secured to the chimney.
In order to open or expand the shade the rings C¹ and B are caused to approach
one another by sliding upon the chimney as in the preceding arrangement and the
cone or flange D' on the ring C' then acts upon the ribs A pushing them outwards
and upwards into the expanded position shown in figure 3. When the shade is
thus opened or expanded the rings B and C¹ are prevented from separating by

page_text: causing the slots f to engage with the pins g and by turning the rings upon their
centres so as to cause the said pins to enter the horizontal portion of the slot as
shown in figure 8.
Having now described and particularly ascertained the nature of the said
Invention and the manner in which the same is or may be used or carried into
effect I would observe in conclusion that what I consider to be novel and original
and therefore claim as the Invention secured to me by the hereinbefore in part
recited Letters Patent is:-
First: Constructing shades for lamps and the like with a frame capable of
being expanded and contracted substantially as hereinbefore described and
illustrated in the accompanying drawing.
Second-In combination with shades for lamps and the like having an
expanding and contracting frame the employment of rings either or both of which
is or are capable of being slidden along the lamp chimney for the purpose of
expanding or contracting the shade substantially as hereinbefore described and
illustrated in the accompanying drawing.
Third: The employment in expanding and contracting shades for lamps and
the like of rings B and C sliding upon the lamp chimney in combination with the
radial rods or ribs A and the stretchers D substantially as herein before described
and illustrated in the accompanying drawing.
Fourth-The arrangement or combination of parts constituting the shade for
lamps or the like as hereinbefore described and illustrated in Figures 3 and 4 of
the accompanying drawing.
In witness whereof I the said John Henry Johnson have to this my
Specification set my hand and seal the fourteenth day of June One
thousand eight hundred and eighty three.
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