Improvements in Telescopic Stands for Oil Lamps.
Year: 1888

page_text: Date of Application, 10th Nov., 1888
Complete Specification Left, 17th July, 1889-Accepted, 24th Aug.,
1889
PROVISIONAL SPECIFICATION.
Improvements in Telescopic Stands for Oil Lamps.
We JOSEPH COTTRELL of No. 176 Ashted Row Birmingham in the County of
Warwick Gas Fitter and ALBERT CHARLES JONES trading as Messenger and Sons
of Broad Street Birmingham aforesaid Manufacturer do hereby declare the nature
of this Invention to be as follows:-
This invention has for its object principally to effect the secure binding or locking
of the upper sliding telescopic tube of the stand after its height has been adjusted in
the lower or fixed tube carried by the foot of the stand. This we effect in a simple
and efficient manner by the construction and combinations of parts hereinafter
described.
According to one of the arrangements of this invention we make the lower end of
the upper and inner sliding tube of the stand elastic by making in the said end for a
short distance a series of parallel longitudinal slits or incisions so that the elastic end
is capable of being expanded and contracted. By the expanding of the elastic end of
the inner sliding tube it is forcibly pressed against the interior of the lower or outer
tube of the stand so as thereby to bind the said inner tube to the outer tube and fix
the height of the stand. The expanding of the elastic end of the inner tube is effected
in the following manner. In the said elastic end a sliding cone is situated and works
the rotation of the cone being prevented by a pin and slot. This sliding cone is
carried by an axial rod which passes upwards and terminates near the socket into
which the oil lamp is screwed. The extreme top of the rod is screwed and upon the
said screwed top a screw box or screw nut works the said screw box having only a
rotary motion. A collar on the exterior of the sliding tube is connected to the screw
box by a set pin so that the rotation of the said external collar through a small angle
in one or other direction gives a corresponding motion to the screw box and causes
the axial rod carrying the cone to rise or fall in the elastic end of the tube. After
the height of the sliding inner tube has been adjusted in the lower fixed tube the
external collar is turned so as to cause the cone to rise in the split or elastic end of
the inner sliding tube. The said split or elastic end is thereby expanded in the fixed
lower tube and the two tubes are bound or gripped firmly together. To release the
inner sliding tube from the fixed tube the external collar is turned in the opposite
direction to that indicated so as to cause the cone to slightly descend in the split or
elastic end. The pressure on the split end being thus removed the said split end takes
its normal figure and the two parts are no longer bound together.
By means of a longitudinal rib on the exterior of the inner sliding tube working in
a slot in the collar at the top of the outer fixed tube the rotation of the sliding tube is
prevented.
In place of a cone on the bottom of the axial rod for causing the expansion of the
split or elastic end of the inner sliding tube of the stand a cam having two rises or
inclines at opposite points upon it may be used. In this case the axial rod has a rotary
motion given to it by the external collar instead of a rising and falling motion. When
the axial rod is turned through a small angle in one direction the rises on the cam
bear against inclines on the interior of the split or elastic end of the tube and expand
the said split end against the fixed outer tube the reversal of the motion of the axial
rod taking the cam out of action and permitting of the elastic or split end resuming
its normal figure.
In order that the inner sliding tube may work frictionally in the outer fixed tube
we use a cork slide or other elastic packed slide working in the said outer fixed tube.

page_text: We provide the end of the cork or other slide with an eye and the bottom of the cone
or cam with a hook which is hooked to the eye on the slide so as thereby to connect
the said cork or other slide with the sliding inner tube.
Dated this 10th dox of Nonamba 1000
W. T. WHITEMAN,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Telescopio Stands for Oil Lamps.
We JOSEPH COTTRELL of No. 176 Ashted Row Birmingham in the County of
Warwick Gas Fitter and ALBERT CHARLES JONES trading as Messenger and Sons
of Broad Street Birmingham aforesaid Manufacturer do hereby declare the nature
of the said 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 has for its object principally to effect the secure binding or locking
of the upper sliding telescopic tube of the stand after its height has been adjusted in
the lower or fixed tube carried by the foot of the stand. This we effect in a simple
and efficient manner by the construction and combinations of parts hereinafter
described.
According to one of the arrangements of this invention we make the lower end of
the upper and inner sliding tube of the stand elastic by making in the said end for a
short distance a series of parallel longitudinal slits or incisions so that the elastic end
is capable of being expanded and contracted. By the expanding of the elastic end
of the inner sliding tube it is forcibly pressed against the interior of the lower or
outer tube of the stand so as thereby to bind the said inner tube to the outer tube and
fix the height of the stand. The expanding of the elastic end of the inner tube is
effected in the following manner. In the said elastic end a sliding cone is situated
and works the rotation of the cone being prevented by a pin and slot. This sliding
cone is carried by an axial rod which passes upwards and terminates near the socket
into which the oil lamp is screwed. The extreme top of the rod is screwed and upon
the said screwed top a screw box or screw nut works, the said screw box having
only a rotary motion. A collar on the exterior of the sliding tube is connected
to the screw box by a set pin so that the rotation of the said external collar
through a small angle in one or other direction gives a corresponding motion to
the screw box and causes the axial rod carrying the cone to rise or fall in the
elastic end of the tube. After the height of the sliding inner tube has been adjusted
in the lower fixed tube the external collar is turned so as to cause the cone to rise
in the split or elastic end of the inner sliding tube. The said split or elastic end is
thereby expanded in the fixed lower tube and the two tubes are bound or gripped
firmly together. To release the inner sliding tube from the fixed tube the external
collar is turned in the opposite direction to that indicated so as to cause the cone to
slightly descend in the split or elastic end. The pressure on the split end being thus
removed the said split end takes its normal figure and the two parts are no longer
bound together.
By means of a longitudinal rib on the exterior of the inner sliding tube working
in a slot in the collar at the top of the outer fixed tube the rotation of the sliding tube
is prevented.
In place of a cone on the bottom of the axial rod for causing the expansion of the
split or elastic end of the inner sliding tube of the stand a cam having two rises or
inclines at opposite points upon it may be used. In this case the axial rod has a
rotary motion given to it by the external collar instead of a rising and falling motion.
When the axial rod is turned through a small angle in one direction the rises on the
cam bear against the inclines on the interior of the split or elastic end of the tube.and

page_text: expand the said split end against the fixed outer tube the reversal of the motion of the
axial rod taking the cam out of action and permitting of the elastic or split end
resuming its normal figure.
In order that the inner sliding tube may work frictionally in the outer fixed tube
we use a cork slide or other elastic packed slide working in the said outer fixed tube.
We provide the end of the cork or other slide with an eye and the bottom of the cone
or cam with a hook which is hooked to the eye on the slide so as thereby to connect
the said cork or other slide with the sliding inner tube.
We will now proceed to describe with reference to the accompanying Drawings the
manner in which the said invention is to be performed.
Figure represents in vertical section; Figure 1A a part of the same drawn to a
larger scale; Figure 2 in horizontal section taken on the line A A Figure 1 and
Figure 3 in horizontal section taken on the line B B Figure 1, a portion of the
telescopic stand of an oil lamp constructed according to one of the arrangements
of this invention, the elastic or split end of the inner tube being represented in its
normal or contracted state and released from the fixed outer tube; Figure 4
represents in vertical section; Figure 4A a part of the same partly in section and
partly in elevation drawn to a larger scale; Figure 5 in elevation; Figure 6 in
horizontal section taken on the line CC Figure 4, and Figure 7 in horizontal
section, taken on the line D D Figure 4, the same parts of the said stand with
the elastic or split end of the inner tube in its expanded state and the said inner
tube bound or locked to the fixed outer tube. In the accompanying Drawings the
lamp which is carried by the head of the inner sliding tube and the foot of the
stand which is connected to the bottom of the fixed outer tube are omitted as
the said parts constitute no part of the invention.
The same letters of reference indicate the same parts in the several Figures of
the Drawings.
e is the upper and inner sliding tube of the stand to the screw socket e of
which the lamp is fixed in the usual way and is the outer and fixed tube carried by
the foot of the stand in which outer fixed tube f the inner tube e is capable of sliding
for adjusting the height of the lamp as is well understood; k is the elastic or
split lower end of the inner tube e capable of expanding and contracting the said
elastic end k being formed by making a series of four (or other number of) parallel
longitudinal slits or incisions in the bottom of the tube; is the sliding cone
situated and working in the elastic end k of the inner sliding tube e the rotation
of the cone being prevented by the pin or stud m on the shank of the cone
working in one of the longitudinal slits in the elastic end of the tube (see Figures 2
and 7). On the exterior of the sliding tube e is a rib g working in the sloth in
the collar at the top of the fixed outer tube f (see Figure 3). By means of the_
said rib and slot g, h the rotation of the sliding tube e is prevented. By the
rising and falling of the sliding cone effected in the manner hereinafter described
the elastic or split end k of the inner sliding tube of the stand can be expanded
and forcibly pressed against the outer fixed tube f so as to bind or lock the inner
tube to the outer tube or the said elastic end permitted to take its normal figure
to liberate the said inner tube for adjusting the height of the lamp. The cone
is fixed to the axial rod n passing upwards and terminating near the socket e³ in the
quick threaded screwed top n². The screwed top n' of the axial rod n works in
the screw box p which has only a rotary motion given to it through about a quadrant.
The screw box p is connected through the pin q with the collar on the exterior
of the sliding inner tube e the said pin working in the slots (see Figure 6)
in the sliding tube e. By moving the collar through about a quadrant in one
or other direction a partial rotation through the same angle is given to the screw
box and the screwed end n of the axial rod n is made to rise or fall in the
P
screw box p and a corresponding motion thereby given to the cone in the split
or elastic end of the inner tube e. We do not limit ourselves to the arrangement
represented for giving a rising and falling motion to the axial rod n and cone ?
situated in the elastic end of the inner tube e as other equivalent mechanical

page_text: arrangements may be used for that purpose: t is the cork slide (or other elastic
packed slide) for causing the inner sliding tube e to work frictionally in the outer
fixed tube f. The said cork slide t is connected to the inner sliding tube e by
means of the hook 2 on the bottom of the cone 7 heing engaged with the eye t³ on
the top of the cork slide t as seen in the drawings.
The action of the parts is as follows:
After the height of the sliding tube e has been adjusted in the fixed tube f the
external collar is turned in the direction proper to cause the cone to rise in
the split or elastic end k of the inner sliding tube e. The said split or elastic
end is thereby expanded in the fixed lower tube f as illustrated in Figures 4, 44
5 and 7 and the two tubes e and fare bound or locked firmly together and the
lamp carried by the inner sliding tube is firmly supported in its adjusted position.
In order to liberate the inner sliding tube e from the fixed outer tube f the
external collar is turned in the opposite direction to that described so as to cause
the cone to slightly descend in the split or elastic end k of the inner sliding tube.
The pressure on the split or elastic end of the last named tube being thus removed the
said split or elastic end takes its normal figure and the two parts ef are no longer
bound or locked together as illustrated in Figures 1, 14 and 2 and the lamp may
be raised or lowered and again fixed in its adjusted position.
2"
Figure 8 represents in vertical section and Figures 9 and 94 in horizontal
section taken on the line 1, 2, drawn to a larger scale a modification of this inven-
tion in which modification the split or elastic end of the inner sliding tube is
expanded and permitted to take its normal figure by the action of a cam on the
axial rod; kk, k k is the elastic or slit end of the inner sliding tube e and u is the
cam fixed on the bottom of the axial rod n the said rod having an angular motion
given to it through about a quadrant by the external collar connected by the
screw pin q to the head of the axial rod n the said pin g working in a horizontal slot
in the sliding tube e.
The shape of the cam u is best seen in the enlarged views Figures 9 and 9^
that is to say, the said cam has rises or inclines u'u at opposite points and the
two parts of the elastic end k, k² of the inner tube e are reduced in thickness at
the parts marked so as to convert them into inclines. By rotating the rod n
by its collar in the direction of the arrow shown in Figure 9 the rises or
inclines of the cam u are carried against the inclines at k k of the elastic
end of the tube and the said elastic end is expanded and locked to the outer fixed
tube as represented in the said Figure 9.
When the cam u is turned in the opposite direction to that indicated by the arrow
in Figure 9 the inclines or rises uus of the cam are brought opposite the thin
parts of the elastic end of the tube and the said elastic end is permitted to take
its normal figure and the inner tube e is liberated from the outer tube f as represented
in Figure 94.
Figures 10 and 11 represent vertical sections of another arrangement of this inven-
tion in which the split or elastic end of the sliding tube is dispensed with and the cam
is made to act against radially sliding bolts working in slots in the bottom of the
sliding tube the said sliding bolts being the equivalents of the thick parts of the
inclined slit end k of the said sliding tube; Figure 12 represents a cross section of
Figure 10 drawn to a larger scale taken on the line 3, 4 and Figure 13 represents a
cross section of Figure 11 drawn to a larger scale taken on the line 5, 6. In
Figures 11 and 13 the radial bolts are represented pressed outwards and the two
tubes eflocked together and in Figures 10 and 12 the said bolts e f are represented
in their back position and the two tubes liberated.
7"
x, x are the two sliding bolts the inner sides of which are inclined working in
openings in the bottom of the sliding tube e. When the cam u is turned through a
quadrant by the rod n and collar into the position represented in Figures 11 and 13
the radial bolts x, x are pressed outwards by the inclines on the said cam and the said
bolts are made to bear against the outer tube f and lock the inner sliding tube thereto
as represented. By turning the rod n through a quadrant in the opposite direction.

page_text: the inclines of the cam are taken out of action and the pressure being removed from
the bolts they can move inwards and release the inner sliding tube e from the
fixed outer tube as illustrated in Figures 10 and 12.
When a cam is used on the axial rod instead of a cone the cork slide t (or other
elastic slide) is hooked to the said cam by the hook and eye at t t³.
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 of "Improvements in telescopic stands for oil lamps'
:-
First The construction and combination of the parts herein before described and
illustrated in Figures 1, 14, 2, 3, 4, 44, 5, 6 and 7 of the accompanying Drawings for
binding or locking the upper and inner sliding telescopic tube carrying the lamp in
the lower and fixed tube carried by the foot of the stand and for releasing the two
parts; that is to say, the combination of the elastic or split end of the upper and inner
sliding tube with the rising and falling cone situated and working within the said
elastic or split end, the rising of the cone causing the elastic or split end to be
expanded in the lower fixed tube thereby binding or locking the two tubes together
and the descent of the cone removing the pressure from the elastic or split end and
releasing the said tubes the several parts being constructed arranged and operating
substantially as hereinbefore described and illustrated.
Secondly The modification herein before described and represented in Figs. 8, 9
and 94 of the accompanying Drawings in which a cam having rises or inclines on its
acting face is used in combination with the elastic or split end of the inner sliding
tube for the purpose and substantially as described and illustrated.
Thirdly The modification herein before described and represented in Figures 10,
11, 12 and 13 of the accompanying Drawings in which radial sliding bolts are used
in combination with a cam having rises or inclines for the purpose and substantially
as described and illustrated.
Lastly Connecting the cork slide or other elastic packed slide working frictionally
in the outer sliding tube of the stand to the bottom of the cone or cam of the locking
mechanism by a hook and eye arrangement as described and illustrated in the
accompanying Drawings.
Dated the 16th day of July 1889.
JOSEPH COTTRELL.
ALBERT CHARLES JONES.