Improvements in Floor Extension Lamps.
Year: 1889

page_text: Date of Application, 12th Mar., 1889
Complete Specification Left, 4th Nov., 1889-Accepted, 7th Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Floor Extension Lamps.
We JAMES BARWell of the firm of James Barwell Son and Company of Worcester
Works Clement Street Birmingham in the County of Warwick Manufacturers and
JOHN FREDERIC SMITH of No. 114 Church Street Aston near Birmingham afore-
said Warehouse Clerk do hereby declare the nature of this Invention to be as
follows:-
The said invention has reference to such lamps as stand on the floor of the room
the body of the lamp being capable of being raised and lowered by the lengthening
and shortening of the pillar of the stand and fixed at any required height. Such
lamps are commonly called floor extension lamps.
The said invention consists of the mechanism hereinafter described situated on the
pillar supporting the lamp and permitting of the upper part of the pillar being readily
raised and lowered and fixed at the required height. The pillar of the lamp consists
of two tubes the tube constituting the upper part of the pillar sliding in the tube con-
stituting the lower part of the pillar. On the summit of the lower tube is a strong
collar carrying at opposite points divided uprights in each of which a lover is jointed.
The inner end of each lever carries a concave nearly semi-tubular plate the inner or
binding face of which is covered with india rubber. The outer end of each lever
projects a short distance beyond the edge of the collar. The said collar carries two
other uprights extending considerably higher than those carrying the levers. The last
named uprights support a circular plate through a central hole in which the upper
tube passes. This plate supports a coiled spring in the axis of which the upper tube
is situated. The collar uprights levers circular plate and spring are enclosed in a case
the top of which rests upon the top of the coiled spring. This case has in its interior
a circular shoulder which when the said case is in its normal or highest position
is situated a little above the outer arms of the levers described.
The action of the parts is as follows:-When the case is in its normal or raised
position the nearly semi-tubular plates carried by the levers boar against the upper
tube and the weight of the said tube and the lamp producos a wedging action which
supports the said tube at the height to which it may have been raised. When it is
wished to raise the lamp it is only necessary to lift the upper tube which can be
raised with the application of a forco equal to the weight of the lamp and upper tube.
On loosing the tube it retains the position to which it has been brought as the slightest
descent of the said tube produces the wedging action referred to and the descont of
the tube is prevented. When it is wished to lower the lamp the upper tube is held
by one hand while the case is depressed by the other hand. The depression of the
case brings its internal shoulder on the outer ends of the levers depressing them and
raising their inner ends carrying the concave plates nearly encircling the upper tube.
These plates being raised from the upper tube the said tube is free to slide downwards
in the lower tube and the lamp can be lowered to the required position. On loosing
the case it is raised by the spring and the concave plates carried by the inner ends of
the levers fall against the upper tube and the wedging action referred to again sets in
and prevents the inner tube from descending. Thus the lamp can be raised by the
simple application of an upward pressure and lowered by taking hold of the upper
tube with one hand and depressing the case with the other.
Dated this 12th day of March 1889.
W. T. WHITEMAN,
Agent for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Floor Extension Lamps.
We JAMES BARWELL of the firm of James Barwell Son and Company of Worcester
Works Clement Street Birmingham in the County of Warwick Manufacturers and
JOHN FREDERIC SMITH of No. 114 Church Streat Aston near Birminghani afore-
said Warehouse Clerk do hereby declare the nature of the said invention and in what
manner the same is to bo performed to be particularly described and ascertained in
and. by the following statement:—
The said invention has reference to such lamps as stand on the floor of the room
the body of the lamp being capable of being raised and lowered by the lengthening
and shortening of the pillar of the stand and fixed at any required height. Such
lamps are commonly called floor extension lamps.
The said invention consists of the mechanism hereinafter described situated on
the pillar supporting the lamp and permitting of the upper part of the pillar being
readily raised and lowered and fixed at the required height. The pillar of the lamp
consists of two tubes the tube constituting the upper part of the pillar sliding in the
tube constituting the lower part of the pillar. On the summit of the lower tube
is a strong collar carrying at opposite points divided uprights in each of which a
lever is jointed. The inner end of each lever carries a concave nearly semi-tubular
plate the inner or binding face of which is covered with india rubher. The outer
end of each lever projects a short distance beyond the edge of the collar. The
said collar carries two other uprights extending considerably higher than those
carrying the levers. The last named uprights support a circular plate or ring
through a central hole in which the upper tube passes. This plate or ring supports
a coiled spring in the axis of which the upper tube is situated.
The collar, uprights, lovers, circular plate or ring and spring are enclosed in a
case the top of which rests upon the top of the coiled spring. This caso has in
its interior a circular shoulder which when the said case is in its normal or highest
position is situated a little above the outer arms of the levers described.
When the case is in its normal or raised position the nearly semi-tubular plates
carried by the gripping levers boar against the upper tube and the weight of the
said tube and the lamp produces a wedging action which supports the said tube
at the height to which it may have been raised. When it is wished to raiso the
lamp it is only necessary to lift the upper tube which can be raised with the
application of a force slightly in excoss of the woight of the lamp and upper tube.
On loosing the tube it retains the position to which it has been brought as the
slightest descent of the said tube produces the worlging action referred to and the
descent of the tube is prevented.
We will now proceed to describe with reference to the accompanying Drawing the
manner in which the said invention is to be performed.
Figures 1 and 2 represent partly in vertical section and partly in elevation a
portion of an adjustable floor extension lamp constructed. according to this invention
the lamp carried by the upper sliding tube of the lamp pillar and the foot fixed to
the lower tube of the said pillar being omitted as the said parts constitute no part
of the invention.
Figure 3 represents in plan, partly in cross section taken through the long uprights,
a portion of the holding mechanism with the sliding case removed.
In Figures 1 and 3 the upper sliding tube supporting the lamp is represented fixed
or gripped by the holding mechanism and in Figure 2 the said upper sliding tube is
represented released and the said tube at liberty to be raised or lowered in the lower
fixed tube of the pillar.
The same letters of reference indicate the same parts in the several Figures of the
Drawing.
a is the upper sliding tube of the lamp pillar to which tube the lamp is fixed in the
ordinary way and is the lower fixed tube of the lamp pillar to which lower tube

page_text: the foot or stand is secured in the ordinary way. In the lower or foot tube b the
sliding or lamp tube a is capable of being raised and lowered and fixed at any desired
height by the mechanism constituting this invention. On the top of the lower tubo b
is a strong collar c carrying at opposite points divided uprights d, d in each of which
a lever ee is jointed, the inner end of each lever carrying a concave nearly semi-
tubular plate e as hest seen in the plan Figure 3. The inner or binding face of each
semi-tubular plate e is covered with india rubber or other yielding material. We will
hereinafter call the levers e, e and their semi tubular plates the gripping levers.
The outer end or arme of each gripping lever projects a short distance beyond the
edge of the collar cas seen in the drawing. The gripping levers take the normal
position represented in Figures 1 and 3 by the weight of their upper arms the lower
On the collar caro
internal edges of the semi-tubular plates bearing upon the tube a.
the longer uprights ff which support a circular perforated plate or ring g through
which the upper sliding tube a passes; h is a coiled spring supported on the said circular
plate or ring g; i is a case made in halves and connected together by screwing as
seen in Figures 1 and 2. By means of the case i the collar cuprights d d and ff;
gripping levers eee; ee²e and plate or ring 9 are covered and enclosed. The case i
is supported in its place by means of the coiled spring the top of the case resting
on the top of the said coiled spring. The spring supported case i is capable of a
limited sliding motion upon the two parts a and b of the lamp pillar; k is an internal
circular shoulder in the case i which shoulder when the case is in its raised or normal
position Figure 1 is a little above and has no action upon the short projecting
arms e,e of the gripping lovers.
The action of the parts is as follows: When the case is in its normal or
raised position Figure 1 the bottom internal edges of the nearly semi-tubular
plates carried by the gripping levers bear against the upper tube a and the
weight of the said tube and the lamp tends to close the said plates and pro-
duces a wedging action which supports the said tube at the height to which it
may have been raised, the case i having no action on the gripping levers as seen
in Figure 1. When it is wished to raise the lamp it is only necessary to lift the
upper tube a which can be raised by the application of a force slightly in excess
of the weight of the lamp and upper tube. As the tube a is raised it forces
asunder or opens the two plates ee of the levers.
On loosing the tube a it retains the position to which it has been brought as the
slightest descent of the said tubo produces the wedging action referred to and the
descent of the said tube is prevented.
When it is wished to lower the lamp the upper tube a is held by one hand while
the case i is depressed by the other hand into the position represented in Figure 2.
The depression of the case i brings its internal shoulder k onto the outer projecting
ends e of the gripping levers thereby depressing the said ends e and raising their
inner ends carrying the concave plates e nearly encircling the upper tube. The
plates being raised from the upper tube a as illustrated in Figure 2, the said
tube a is free to slide downwards in the lower tube b and the lamp carried by the
said upper tube a can be lowered to the required position. On loosing the case i
it is raised by the spring hand the concave plates e, e carried by the inner
ends ee of the gripping levers fall against the upper tube a and the wedging action
referred to again sets in and prevents the inner tube a from descending. Thus the
lamp can be raised by the simple application of an upward pressure and lowered by
taking hold of the upper tube a with one hand and depressing the case i with the
other.
Having now particularly described and ascertained the nature of the said inven-
tion and the manner in which the same is to be performed we declare that we
claim as the said invention :-
The construction and combination of the parts hereinbefore described and illustrated
in the accompanying Drawing for supporting and fixing and releasing the upper
or sliding part of the pillars of floor extension lamps; that is to say, the combination

page_text: of the pair of gripping or wedging levers e, e³, e supported by the lower or fixed half
or part of the lamp pillar with the sliding spring supported case i shouldered internally
near the bottom, the said pair of gripping levers and spring supported case being
arranged with respect to one another and acting substantially as described and
illustrated.
Dated the Fourth day of November 1889
W. T. WHITEMAN,
Agent for the Applicants.