Telescopic Joints for Tubes.
Year: 1896

page_text: Date of Application, 30th Jan., 1906
Complete Specification Left, 30th Sept., 1896-Accepted, 28th Nov., 1896
Complete Specification Left, 30th Sept., 1896-Accepted, 28th Nov., 1856
Telescopic Joints for Tubes.
I, EDWARD JOHN SHAW, of Astral Works, Hatherton Street, Walsall, in the
County of Staffordshire, Lamp and Glass Manufacturer, do hereby declare the
nature of this invention to be as follows:-
My invention relates to an improved construction of telescopic joints for tubes,
and has for object to provide an adjustable sliding connection between any two
tubes of oil or gas lamps, chandeliers, electric light fittings, or standards for
supporting and displaying shop goods, or other fittings in which it is desired to
have an adjustable tubular connection.
In attaining this object I propose to construct my improved telescopic joint on
the screw principle, and for this purpose I may either arrange for an inner metal
tube provided with a piston, formed of a pad of dermatine or other suitable material,
to slide within an outer tube spirally grooved or screwed internally, the groove
being of corresponding form and dimensions to the pad or piston; or I may other-
wise form the outer tube internally plain and provide it with a suitable spiral strap
or twisted bar secured at one end within it, the inner tube having its connecting
end plugged or closed by a metal disc soldered or otherwise secured therein, and
a slot or opening being cut through the disc or plug of sufficient size to pass over..
the spiral strap or bar within the outer tube.
In the case of a gas chandelier or pendant, I propose to suspend the outer tube
within a ball-joint screwed to the end of the supply pipe, the rotation of the tube
independently of the ball-joint being prevented by means of a suitable cross-pin
secured within the latter and passing across the tube between recesses or slots
formed on the end of the same. An inner spiral strap or twisted bar, secured at
one end within the upper extremity of the outer tube, extends downwards to the
other extremity, and the inner tube is arranged to travel on the screw within the
outer tube by means of a slot cut through a plate or plug secured in its upper
end. A piston of suitable elastic substance to prevent the passage of gas around
the outer side of the inner tube is provided in the usual manner near the end of
the inner tube, aud I prefer to use for this purpose a pad of dermatine.
Immediately below the plug and above the piston, the inner tube is perforated
with one or more holes for the passage of the gas from the outer or upper tube.
The lower end of the upper tube is provided with a suitable screwed cap or socket
to form a stuffing-box for the inner tube to work through. With this arrangement
the chandelier or pendant is raised or lowered by turning it around in one direction
or the other within the upper tube, whereby the use of counter-weights and chains
is dispensed with, and a neater appearance is obtained.
A similar arrangement may be applied to a standard lamp, the inner tube being
in that case above and the outer tube below.
When applied to electric light fittings the plug or cap of the inner tube may
be perforated to allow, the passage of the, conducting wires which may be provided
with swivel joints above and below the telescopic joint of the tubes; or if an
internally grooved tube be used, the plug at the end of the inner tube would be
dispensed with.

page_text: The improved telescopic joint may readily be employed for show-stands, shop-
fittings and other purposes where the adjustment of the height or the extension of
the stand is a desideratum.
I, EDWARD JOHN SHAW, of Astral Works, Hatherton Street, Walsall, in the
County of Staffordshire, Lamp and Glass Manufacturer, 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 :-
My invention relates to an improved construction of telescopic joints for tubes,
and has for object to provide an adjustable sliding connection between any two
tubes of oil or gas lamps, chandeliers, electric light fittings, standards for supporting
and displaying shop-goods, or other fittings in which it is required to have an
adjustable tubular connection.
In order to attain this object, I construct my improved telescopic joint on the
screw principle, and for this purpose I arrange either for an inner metal tube,
provided with a piston formned of a pad of dermatine or other suitable material, to
slide within an outer tube spirally grooved or grooved internally, the groove
being of corresponding form and dimensions to the pad or piston; or I may other-
wise form the outer tube internally plain and provide it with a suitable spiral
strap or twisted bar secured at one end within it, the inner tube having its
connecting end plugged or closed by a metal disc soldered or otherwise secured
therein, and a slot or opening being cut through the disc or plug of sufficient size
to pass over the spiral strap or bar within the outer tube.
On the accompanying drawings illustrating my invention―
Figure 1 is an elevation of a gas pendant arranged according to my invention;
Figure 2 being a similar view of a two-light chandelier shewing the application
of my invention thereto;
Figure 3 is a vertical section of the inner and outer telescopic tubes provided
with an inner spiral bar;
Figure 4, a similar view of an arrangement of a piston secured upon the inner
tube and sliding upon a screwed rod within the outer tube;
Figure 5 illustrates a modification of the above-the piston being fitted with a
bucket and arranged to slide upon a twisted rod; and-
Figure 6 shews an arrangement for suspending the chandelier or pendant from
a bull-joint secured to the supply-pipe.
In applying my invention to a gas chandelier or pendant, as shewn on Figs. 1, 2,
and 3, may suspend the outer tube A from a ball-joint B attached to the end of
the supply-pipe, the rotation of the tube A being prevented by means of a suitable
cross-pin C secured within the ball-joint and passing across the tube A between
suitable recesses or slots D formed on the end of the same-see Fig. 6. An inner
spiral strap or twisted bar E, secured at one end within the upper extremity of
the outer tube A, extends downwards to the other extremity, and the inner tube F
is arranged to travel on the bar or strap E within the outer tube A by means of
a slot cut through a plate or plug G secured in its upper end. A piston H of
dermatine or other suitable elastic substance, to prevent the passage of gas around
the outer side of the inner tube F, is provided near the upper end of the inner
tube in the usual manner. Immediately below the plug G and above the piston H,

page_text: the inner tube F is perforated with one or more holes I for the passage of gas
from the outer or upper tube A. The lower end of the upper tube is provided
with a suitable screwed cap or socket K, to serve as a guide or gland for the
inner tube F to work through.
With the above arrangement the chandelier or pendant is raised or lowered to
any desired.height by turning it around in one direction or the other within the
upper tube A, the spiral twist or screw-threaded spindle E serving to automatically
retain it in position,-the use of counterweights and chains being thus dispensed
with, and a neater appearance obtained.
In the case of a standard lamp a similar arrangement to the foregoing may be
applied, the inner tube being in such case placed above, and the outer tube below,
instead of as in the preceding arrangement.
Or instead of one tube turning within the other, a spirally grooved or screwed
rod may be arranged to rotate within the tubes on raising or lowering the lamp,
in which case a plug internally screwed will be secured within the inner tube so
as to pass over the screwed rod, the latter being provided with a pivot or axis at
its lower extremity, turning in a suitable plate or cross-bar at or near the bottom
of the outer tube.
Where a solid screw is used the gas in the top tube A is passed to the
descending tube F, through apertures or other passages made through the piston
or nut H as shewn at L on Figure 4.
When applied to electric light fittings, the plug G of the inner tube F may be
perforated to allow the passage of the conducting wires, which may be provided
with swivel joiuts or equivalent devices above and below the telescopic joint of
the tubes.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In chandeliers or pendants, the combination with an inner and an outer
tube, F and A, of a piston G secured upon said inner tube F, a spiral bar E fixed
within the outer tube A, a slot or opening in said piston to pass over said spiral
bar E, and a screwed cap or gland K upon the end of the outer tube, for the
purposes specified and as described with reference to the accompanying drawings.
2. In standards for lamps and other purposes, the arrangement of an inner
tube F provided with a hollow piston G arranged to slide within an outer tube A,
a spirally grooved or screwed rod E pivoted at its lower end in the outer tube,
and capable of being rotated by the vertical movement of the piston G,-the inner
tube F being normally retained in position by frictional contact between the piston
and the outer tube A, as described and for the purposes specified.
Dated this 30th day of September 1898.
1030
For the Applicant,
GEDGE & FEENY,
60 Queen Victoria Street, London, E.C., Chartered Patent Agents.