An Improved Adjustable Spring Suspending Device for Hanging Lamps and other Objects.
Year: 1890

page_text: Date of Application, 22nd Feb,, 1890-Accepted, 7th June, 1890
COMPLETE SPECIFICATION.
An Improved Adjustable Spring Suspending Device for Hanging
Lamps and other Objects.
I, UBBO HANSCHEN STAHL DE BOER, of No. 92 and 93 Markgrafen Strasse, in the
City of Berlin, Germany Engineer, do hereby declare the nature of my said 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 adjustable spring suspending device for hanging lamps
and other objects, in which two spirally bent leaf springs are employed for suspending
objects in such manner that the lower ends of the said springs are drawn down between
two rollers arranged near each other, so that the saine, by means of the weight of the
suspended object, are brought out of their spiral forin and compelled to assume a
straight or rectilinear form. An appropriate arrangement of the rollers renders it
possible to retain the suspending device automatically in any desired position.
In the accompanying drawings, Figure 1 is a vertical section on the line A, A,
in Figure 2,
Figure 2 is a vertical section on the line B, C, D, E in Figure 1,
Figure 3 a side view of the suspending device with the spiral springs extended,
Figure 4 a side view of the T piece which carries the aforementioned rollers, and
Figure 5 is a horizontal section on the line F, G, in Figure 3.
a, a, are the side walls of the frame enclosing the suspending mechanism. These
side walls a, a, are connected at their upper ends by means of a cross piece b which
can be simultaneously employed by means of a hook or ring fixed to or made of one
piece with the cross piece for hanging the suspending device to the ceiling of the
room or otherwise.
At their lower ends the side walls a, a, are provided with slots c which diverge from
each other upwards and serve as guide slots for two friction rollers. These friction
rollers d gear with their journals into the slots c and are carried by a T piece e
depending from a bolt f, which connects the two side walls near the middle of the
same. The ends g of two spiral springs g are drawn down between the two rollers d
and are connected by means of a suitable forked piece . The forked piece is provided
with a boring i for receiving the upper hook of a rod or chain k, to the lower end of
which the object to be suspended is attached.
The new spring suspending device is specially adapted for suspending chandeliers,
hanging lamps and the like and is enclosed by a suitable sheet metal casing H, so that
the mechanism is hid from sight. The rod or chain k from which the lamp or other
object is suspended at suitable distance from the ceiling can also be enclosed in an
appropriately decorated tube 1, which can be attached to the walls a, a, of the device
or to the casing of the same. The length of the tube must be so chosen that the
ends g of the spring g or the fork h do not protrude from the end of the tube / when
the springs g are extended to their full extent, that is, when the same have been
drawn down until the stops 9 come in contact with the rollers d.
Two rollers m are arranged in the walls a, a, in order to keep the straight disused
parts of the springs g from contact with the exterior of the rollers d, so that the same
are in no way hindered in their revolution. The strength of the springs g must be
chosen according to the weight of the lamp to be attached to the same. Four various
sizes of suspending devices will suffice for all ordinary hanging lamps, which vary in
weight from 6 to 30 lbs.
The operation of the suspending device is as follows:-
If a lamp is hung onto the rod or chain k, the weight of the same will tend to draw
the springs g between the rollers d and straighten the same. The downward pressure
thus exerted on the rollers d will in consequence of the converging slots c, cause the
said rollers to be so neared that only a very small space, about a 16th or 32nd of an
Dine B1

page_text: inch remains between the springs. The tension of the springs is so increased that
the tendency of the said springs to contract is balanced by the weight of the lamp.
The rollers are prevented from descending so far that the springs gare pressed against
each other by the horizontal arms of the T piece e or that the clamping of the springs
could ensue.
If it is desired to have the lamp hang somewhat lower it suffices to simply draw
down the same with the hand, when the lamp will remain in the position desired. On
the other hand it is only necessary to press the lamp upwards to give the same a
higher position.
The rollers d receive hereby a certain upward pressure and as the same are simul-
taneously pressed outwards by the springs they rise in the diverging slots and
move somewhat from each other. The friction between the springs g and the rollers d
is hereby decreased and consequently the raising of the lamp facilitated, and further-
more, the lamp will remain in any desired position.
When springs of stronger metal are employed the rollers must be arranged some-
what further apart, which is done by shifting the T piece somewhat higher,
for which purpose the walls a, a, are provided with several borings n for receiving
the bolt f.
It will be evident from the foregoing that the form, size and arrangement of
the parts can be modified in various manner without departing from the nature of
my said invention.
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 A spring suspending device for lamps and other objects in which two springs g
are at their one end connected to each other, whilst the other ends are free, said
springs passing through rollers so as to assume a straight form and hold an
object hung or attached to the same in any desired position, substantially as
specified and illustrated.
2-My improved suspending device, substantially as and for the purpose set forth
in the foregoing specification, and illustrated in the accompanying drawings.
Dated this 21st day of February 1890.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent for the Applicant.