Improvements in Extension Standards for Lamps or other Analogous Purposes.
Year: 1889

page_text: Date of Application, 17th July, 1889
Complete Specification Left, 16th Apr., 1890-Accepted, 17th May. 1890
PROVISIONAL SPECIFICATION.
Improvements in Extension Standards for Lamps or other
Analogous Purposes.
We THOMAS HENRY THOMPSON and FREDERICK ARTHUR POWELL, trading as
Thompson and Powell, of Summer Row, Birmingham, in the county of Warwick,
Brassfounders do hereby declare the nature of this invention to be as follows:-
This invention relates to the combination and arrangement of parts, constituting
mechanism for adjusting and securing an extending pillar or standard in any given
position, particularly such pillars or standards, which are used in what are known
as extension standard floor lamps, and the object of the invention is; to provide
that a central vertical sliding toothed rack, shall take into and operate a toothed
eccentric or eccentrics, which said eccentric or eccentrics shall bind the central sliding
tube to the outer pillar tube.
I provide a suitable tubular standard as a base; I further provide an extending
tubular pillar, which passes down into the base pillar telescopically, passing through
a screw cap or other suitable provision at the top of the base pillar.
Near the top of the extending pillar, a lever is provided, the manipulating handle
of which is upon the exterior. This lever operates an internal central rod, which said
rod in its normal position, is kept pressed downwards by a spiral spring. At the
lower end of this rod (which coincides with the lower end of the aforesaid sliding
tube) a vertical toothed rack is formed, a suitable guide being provided for it in the
said lower end of the tube.
A
In the said lower end of the tube is also provided a parallel vertical channel, having
a cross hole to receive a joint pin. This channel is made as wide as convenient.
toothed eccentric is now provided, having a joint hole coinciding with the joint hole
in the tube aforesaid. A portion of this eccentric piece is made concentric with the
joint, and such part has gearing teeth answering with and taking into the teeth of
the toothed rack, while its other portion is, as its name indicates, eccentric to the said
joint. This eccentric portion may be further roughened or serrated if necessary, to
form a firmer grip upon the outer tube. This piece is now mounted upon its joint,
when by reason of the spring acting upon the central rod, the rack is depressed, which
n its turn rotates the eccentric, thus forcing its enlarging surface against the inside
of the lower fixed tube, any increased downward force or pressure only tending to
bind it still more.
Upon raising the central rod and rack however, the eccentric is rotated backwards,
nd the grip released, while without manipulating the central rod, the sliding tube
nay be raised direct, inasmuch as the eccentric would yield from its grip, when being
hus raised.
As will be clearly seen two such racks, and two such eccentrics, may be readily
mployed instead of one, if desired, also the downward movement of the central rack
ay be made to unlock the binding action of the eccentric, if desired, the lever
echanism being modified to suit.
Dated this 10th
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Extension Standards for Lamps or other
Analogous Purposes.
We, THOMAS HENRY THOMPSON, and FREDERICK ARTHUR POWELL, trading as
Thompson & Powell, of Summer Row, Birmingham, in the county of Warwick,
[Price 8d.]

page_text: Brassfounders do hereby declare the nature of this invention and in what
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
This invention relates to the combination and arrangement of parts, constituting
mechanism for adjusting and securing an extending pillar or standard in any given 5
position, particularly such pillars or standards, which are used in what are known as
extension standard floor lamps; and the object of the invention is, to provide that a
central vertical sliding toothed rack, shall take into, and operate a toothed eccentric
or eccentrics, which said eccentric or eccentrics shall bind the central sliding tube to
the outer pillar tube.
In order to more clearly explain this our invention, we have appended hereunto an
illustrative sheet of drawings, upon which are figures and letters of reference, similar
letters referring throughout the several views to the same thing or part.
Fig. 1, is a vertical section of the working parts of this our invention.
Figs. 2 & 3, are detailed side and top views of the toothed eccentric.
Fig. 4 shows an application of two toothed eccentrics.
Fig. 5, is a general view showing its application to a floor extension lamp.
We provide a suitable tubular standard a, as a base; we further provide an
extending tubular pillar b, which passes down into the base pillar a, telescopically,
passing through a screw cap c, or other suitable provision at the top of the base
pillar.
Near the top of the extending pillar b, a lever d, is provided, the manipulating
handle of which is upon the exterior. This lever operates an internal central rod e,
which said rod in its normal position, is kept pressed downwards by a spiral spring f
At the lower end of this rod e, (which coincides with the lower end of the aforesaid
sliding tube) a vertical toothed rack g, is formed, a suitable guide 1, being provided
In the said lower end of the tube b, is also
for it in the said lower end of the tube b.
provided a parallel vertical channel, having a cross hole to receive a joint pin i. This
A toothed eccentric j, is now provided,
channel is inade as wide as convenient.
having a joint hole coinciding with the joint hole i, in the tube aforesaid. A portion
of this eccentric piece j, is made concentric with the joint, and such part has gearing
while its other
teeth answering with, and taking into the teeth of the toothed rack
portion is, as its name indicates, eccentric to the said joint i. This eccentric portion
may be further roughened or serrated if necessary, to form a firiner grip upon the
outer tube a. This piece j, is now mounted upon its joint i, when, by reason of the
spring, acting upon the central rod e, the rack 9, is depressed, which in its turn
rotates the eccentric j, thus forcing its enlarging surface against the inside of the
lower fixed tube a, any increased downward force or pressure, only tending to bind
it still more.
Upon raising the central rod b, and rack, however, by means of the lever d,
the eccentric, is rotated backwards, and the grip released, while without manipu
lating the central rod, the sliding tube b, may be raised direct, inasmuch as
the eccentric wonld yield from its grip, when being thus raised.
As will be clearly seen, two such racks g', g', and two such eccentrics, j', may
be readily employed instead of one, if desired, as seen in Fig. 4; also the downward
movement of the central rack may be made to unlock the binding action of the
eccentric if desired, the lever mechanism being modified to suit, and the eccentric o
eccentrics placed upside down to what is shown.
Having now particularly described and ascertained the nature of our said inver
tion, and in what manner the same is to be performed, we declare that what w
claim is :-
1st. The combination in extension mechanism for lamp or other standards, of a
extensible tube, and an operating rod e, having formed thereon or attached thereto,
toothed rack 9, with a toothed eccentric j, constructed and operating substantially
described and illustrated upon the drawings.
2nd. The modification in the application of a double sided toothed rack with tw
1

page_text: toothed eccentrics j', j', substantially as shown in Fig. 4, and for the purposes
specified.
3rd. The general combination and arrangement of the application of a toothed rack
or racks, with a toothed eccentric or eccentrics to an extension standard.
Dated this 15th day of April 1890.
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicants' Agent.