Improvements in the Raising and Lowering Mechanism of Suspension Lamps.
Year: 1890

page_text: Date of Application, 11th Aug., 1890-Accepted, 27th Sept., 1890
T
Improvements in the Raising and Lowering Mechanism of
Suspension Lamps.
I, OTTO KRABBES, Secretary of Radebeul, near Dresden in the Kingdom of
Saxony and Empire of Germany do hereby declare the nature of my invention and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:—
The improved raising and lowering mechanism for suspension lamps hereinafter
described has for its object to extend the course or up and down travel of that class
of suspension lamps which have been hitherto limited by their counter-balance
weights in such a manner that the said lamps may be raised nearer to the ceiling than
heretofore and lowered the whole distance on to the table top. For this purpose the
counterbalance weights which balance the weight of the lamp on the pulleys have
hitherto moved within the area of the circular suspension frame of the lamp arranged
immediately above the glass chimney of the lamp while their downward motion
applied to the said frame has been limited by the ascending lamp chimney. The
improved suspension frame is resiliently constructed, so that the higher it is raised
and the nearer it comes to the pulleys, the more it becomes collapsed and inversely
the more it is pulled down, the more it is extended, until it finally passas completely
over the lamp. The collapse of the suspension frame of the lamp is carried out by the
pulleys in connection with the weights, while the extension of the same is solely due
to the resiliency of the ring itself.
This invention is fully illustrated on the accompanying drawings in which Fig. 1
is a side view of the improved raising and lowering mechanism provided with
pulleys such as have hitherto been employed. Fig. 2 is a side view of the raising and
lowering mechanism in connection with an improved arrangement of pulleys specially
designed in accordance with my invention.
Fig. 3 is a vertical section of the latter.
Fig. 4 is a plan and Fig. 5 an inverted plan view of the same.
Fig. 6 is a side view of the suspension frame as it is being raised.
Fig. 7 is a side view of the suspension frame in its highest (and collapsed)
position.
Fig. 8 is a plan of the pulley arrangement and of the suspension frame
corresponding to Fig. 6.
Fig. 9 is a side view of one of the clamps used for fastening ornaments to the
spring frame.
The suspension frame a rests loosely in the rings b to which the draw chains c are
connected. These rings also carry the weights d which balance the weight of the
lamp and enable the
same to remain suspended at any desired height
(Figs. 6, 7 & 8). The suspension frame a consists of an ordinary resilient steel
wire ring the ends of which are provided with eyes through which they are
respectively guided and slide in and out without being able to leave the same.
Clamps are arranged around the frame a and serve to hold an ornamental fringe or
curtain of cloth, chenille or crotchet work which follows the notion of the frame a
and has for its object to conceal the same. The chains run over the pulleys h of
the pulley frame i and terminate at the metallic ring & which regulates the motion
of the chains. The lamp is fixed to the ring in the usual manner i.e. by means of
chains. It will be obvious that this arrangement of raising and lowering mechanism
can be applied with little cost to any existing suspension lamp.
The frame a has while fully extended an equal or a slightly larger circumference
than that of the lamp itself and holds the weights dat a suitable distance from one
another. When the lamp is pulled down the frame a is raised and the nearer it
[Pics/1

page_text: reaches to the pulley frame the more it collapses owing to the tension of the chains
until it finally strikes against the pulleys of the said pulley frame as seen in Fig. 7.
In new lamps, the latter is preferably provided with three arms for relieving the
tension the ends of these arms being likewise provided with pulleys, Figs. 2 to 7.
The lamp arranged in the manner above described can be drawn down very low.
When the lamp is raised, the frame is lowered and owing to its resiliency as well as
to the action of the weights, the same becomes extended so as not to come in contact
with the lamp shade, and hence the lamp with its counterbalance weights can be raised
to the same height as the frame. The ring k is only used to render the tension of the
chains c uniform and thus to cause the raising and lowering mechanism to move
quietly. It is obvious that additional connecting chains c¹ may be used for the purpose
of ornamentation.
Having thus particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed declare that what I
claim is =
1st. The improved raising and lowering mechanism for suspension lamps
characterized by a metallic resilient and circular frame a carried loosely with its
counterbalance weights d in the rings arranged at the end of the draw chains c
the said frame being capable of being raised when the lamp is pulled down as
high as the pulley frame for the purpose of extending the motion or travel of the
lamp substantially as herein before described and illustrated on the accompanying
drawing.
2nd. In combination with raising and lowering mechanism claimed above the
arrangement of a pulley frame furnished with a number of arms corresponding
with that of the suspended chains, these arus being provided with pulleys at their
extremities in order to prevent too great a tension upon the frame a substantially as
herein before described and illustrated on the accompanying drawing.
Dated this 9th day of August 1890.
JOHN G. WILSON,
Agent for the Applicant.