Improvements in Extension Pillars or Stands for Lamps or other Analogous Purposes.
Year: 1890

page_text: Date of Application, 11th Mar., 1890
Complete Specification Left, 3rd May, 1890-Accepted. 21st June, 1890
PROVISIONAL SPECIFICATION.
Improvements in Extension Pillars or Stands for Lamps or other
Analogous Purposes.
i
We, ALFRED HENRY GRIFFITHS, and EVERED AND COMPANY Limited, of Surrey
Works, Smethwick, in the county of Stafford, Manufacturers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to improvements in the construction and arrangement of
parts constituting an extension action, for floor lamps and other analogous purposes,
and its object is to provide improved means whereby the extensible tube is auto-
matically supported at any given part of its travel, while it may at will be raised or
lowered to any desired point.
Upon a suitable foot or base, a tubular pillar is erected in which slides telescopically
a tubular extension piece, which said extension sliding piece, carries at its upper end
the lamp or lamps, or ornaments in combination with such lamp or lamps &c. Ab
the lower end of this extension sliding piece, is situated the expanding mechanism,
whereby it may be adjusted and secured firmly in any desired position of its travel;
and which is constructed after the following manner:
The lower end of the sliding piece fits loosely in the lower tubular part, plunger
fashion; at its lower part we make provision for carrying cross levers, whose fulcrums
lie in the horizontal plane. The outer end of these levers, impinge against the inside
surface of the lower tubular part, while the other ends are acted upon by an interior
vertical operating rod, and a spring, the which always tends to press the front of the
lovers against the inside of the tubular part or pillar. The rod is carried upwards
through the tubular sliding extension piece to within a short distance of the top,
terminating with a cross lever piece, (or its equivalent,) which is carried to tho
exterior of the sliding piece, and capable of an up and down motion for a short
distance, by the pressure of the thumb &c
The inner ends of the two levers are connected to the vertical interior rod somewhat
as follows:-The fulcrum of each lever is carried upon a central pin which is secured
to the lower end of the extensible tube, and. their inner, ends cranked upwards some-
what, and cross each other. To the ends of each of the levers is now attached a link,
which at their other ends are attached to the. lower end of the inner vertical rod.
Thus when the inner rod is pressed downwards, the outer ends of the two levers are
expanded outwards against the side of the standard and hold the extensible tube-in
any adjusted position.
..
Thus the action is somewhat as follows:-
Upon slightly depressing the inner rod by means of the upper cross lever &c., the
pressure levers are released from the inside: of the tubular pillar, when the sliding
piece, lamp &c., may be raised or lowered. Upon letting go the said cross lever &c.,
the spring palls the rod, and at the same time presses the front of the levers
against the inside of the tubular part; and secures the sliding piece in any given
position; any downward-pressure of the slide; tending rather to the more perfectly
securing it, than to release it.
Dated this 10th day of March 1890.ga
**
1..
CHARLES T. POWELL,
Jabuk
ideed!
Brice 8 bi
: A
.
Applicants Agent

page_text: COMPLETE SPECIFICATION.
Improvements in Extension Pillars or Stands for Lamps or other
Analogous Purposes.
We ALFRED HENRY GRIFFITHS and EVERED AND COMPANY Limited, of Surrey
Works, Smethwick, in the county of Stafford, Manufacturers, 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 :—
This invention relates to improvements in the construction and arrangement of
parts constituting an extension action, for floor lamps and other analogous purposes.
and its object is to provide improved means whereby the extensible tube is auto-
matically supported, at any given part of its travel, while it may at will be raised or
lowered to any desired point.
Upon a suitable foot or base, a tubular pillar is erected, in which slides telescopically
a tubular extension piece, which said extension sliding piece carries at its upper end
the lamp or lamps or ornaments &c. At the lower end of this extension sliding piece,
is situated the expanding mechanism, whereby it may be adjusted and secured firmly
in any desired position of its travel; and which is constructed after the following
manner -
The lower and of the sliding piece fits loosely in the lower tubular part, plunger
fashion at its lower part we make provision for carrying two cross levers, whose
fulcrums lie in the horizontal plane. The outer end of these levers, impinge against
the inside surface of the lower tubular part, while the other ends are acted upon by
'an interior vertical operating rod, (and a spring, the which always tends to press the
front of the levers against the inside of the tubular part or pillar). The rod is
carried upwards through the tubular sliding extension piece, to within a short distance
of the top, terminating with a cross lever piece, (or its equivalent) which is carried to
the exterior of the sliding piece, and capable of an up and down motion for a short
distance, by the pressure of the thumb &c.
The inner ends of the two levers are connected to the vertical interior rod some-
what as follows:-The fulcrum of each lever is carried upon a central pin, which is
secured to the lower end of the extensible tube, and their inner ends cranked upwards
somewhat, and cross each other. To the ends of each of the levers is now attached a
link, which at their other ends are attached to the lower end of the inner vertical rod.
Thus when the inner rod is pressed downwards, the outer ends of the two levers are
expanded outwards against the side of the standard, and hold the extensible tube in
any adjusted position.
Thus the action is somewhat as follows:-
Upon slightly raising the inner rod by means of the upper cross lover &c., the
pressure lovers are released from the inside of the tubular pillar, when the. sliding
piece, lamp, &c., may be raised or lowered. Upon letting go the said cross lever &c.,
the spring presses down the rod, and at the same time presses the front of the' levers
against the inside of the tubular part, and secures the sliding piece in any given
.position; any downward pressure of the slide, tending' rather to the more perfectly
securing it, than to release it.
We will now proceed to more particularly describe how this our invention may be
performed, having regard to the accompanying illustrative sheet of drawings upon
which are figures and letters of reference, and upon which:
Fig. 1, is a vertical section of this our invention.
Fig. 2, is a vertical section at right angles to Fig. 1.
Fig. 3, is a section showing the grippers open.
--
Fig. 4, shows the kind of lamp or stand for which it is intended.
Upon a suitable foot or base a, a tubular pillar bis erected, in which slides teles-
copically a tubular extension piece c, which said extension sliding piece, carries at its
upper end the lamp or lamps d, or ornaments &c. At the lower end of this extension

page_text: sliding piece c, is situated the expanding mechanism, whereby it may be adjusted and
secured firmly in any desired position of its travel; and which is constructed after
the following manner:
The lower end of the sliding piece fits loosely in the lower tubular part b, plunger
fashion; at its lower part we make provision for carrying two cross levers g, g, whose
fulcrums, lie in the horizontal plane. The outer end of these levers 9, 9, impinge
against the inside surface of the lower tubular part b, and their inner ends h, h, are
connected to links i, i, which latter in their turn are again connected at j, to the
vertically operating rod k. At the upper end of this rod is situated the spring !,
whose tendency is always to keep the rod k, down, and thereby press the front of the
levers at , against the pillar b, as seen in Fig. 1, and sustain the tube c, &c. in any
given position. The rod k, is carried upwards through the tubular sliding extension
piece e, to within a short distance of the top, terminating with a cross lever piece m,
(or its equivalent) which is carried to the exterior of the sliding piece, and capable of
an up and down motion for a short distance, by the pressure of the thumb &c.
Thus the action is somewhat as follows:-
Upon slightly raising the inner rod by means of the upper cross lever m &c., the
pressure levers 9, 9, are released from the inside of the tubular pillar b, when the
sliding piece c, lamp, &c., may be raised or lowered. Upon letting go the said cross
lover &c., the spring 1, presses down the rod k, and at the same time presses the front.
of the levers 9, 9, against the inside of the tubular part b, and secures the sliding
piece c, in any given position; any downward pressure of the slide, tending rather to
the more perfectly securing it, than to release it.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim is :-
1st. The combination in extension mechanism for lamps or other analogous purposes,
of an extensible tube, and an operating rod k, with the links i, i, and cranked
levers g, g, engaging with the pillar b, the whole constructed and operating, substan-
tially as hereindescribed and illustrated upon the drawings.
Dated this 2nd day of May 1890
CHARLES T. POWELL,
12, Cherry Street, Birmingham, Applicants' Agent.