Improvements in Lamp Posts or Holders for, Electric Street Lamps and other Large Lamps..
Year: 1896

page_text: Date of Application, 11th Apr., 1896-Accepted, 30th. May, 1896
COMPLETE SPECIFICATION.
Improvements in Lamp Posts or Holders for, Electric Street Lamps
and other Large Lamps..
I, JOSEF JAKOUBEK, Director der fürstlich Hanau'schen Eisenwerke, of
Komarau, Bohemia, in the Austro-Hungarian Empire, 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 :-
Lamp posts for electric street lamps and similar lamps should be constructed in
such a manner that they throw a minimum of shadow,, and, that the lamps are
accessible without the use of a. ladder: when it is desired, to renew the carbons,, to
clean the lamp, or to effect slight repairs. Such lamps are frequently suspended
from a wire rope or string, passing over a small guide pulley at the free or upper.
end of a suitable arm or bracket,. and extending, down to a winding.drum situated a
convenient distance above the floor..
If the said lamp bracket: be rigidly.fixed.. to the upper end of a column or
lamp post, and so arranged that the lamp, will be situated vertically, above the
axis of the said column: in order to reduce: the. shadows, the lamp. can be lowered
but a short distance only without touching the column.
In order to overcome. this obstacle: and to construct. a. holder satisfying, the
requirements mentioned above, I construct the lamp-holder, or bracket in such a
manner that when the lamp is being lowered,. its point of suspension will auto-
matically travel sideways-before: the lamp: touches the column or post, and the lamp
may then descend clear of the post.
In further describing the invention reference will be made to the accompanying
drawings, of which
Fig. 1 is a vertical section of a lyre-shaped lamp holder embodying my inven-
tion; Fig. 2 is a vertical section of the same at right angles to Fig. 1, both.
figures showing the lamp in its highest position;
Fig. 3 is a section similar to Fig. 2, but, showing the lamp partly lowered.;.
Fig. 4 is an enlarged horizontal section along line M-M of Fig. 1,, seen, from.
below; and
Figs. 5, 6 and 7 represent a. modification..
I attain my object by suspending the lamp from a bracket or holder pivoted on a
horizontal axis, and so arranged that, in the normal position of the lamp, the bracket:
will throw a minimum of shadow.
The rope or chain for suspending the lamp passes over a series of. guide,rollers
and through the interior of the column or lamp post. down to the winding
mechanism situated near the base of the said post or column. When the lamp
is drawn up by means of the said winding mechanism, it ascends first up to the
extended bracket, and then takes the former. with it,, so as to again, reach its former
upright position.
In Figs. 1 to 4, A represents an arc-lanıp, S. a wire rope or chain passing over
guide rollers 3 to 8 to the interior of a hollow, column or post B and thence
down to a suitable winding gear not shown in the drawing. On the lamp post
or column is mounted a stationary holder or frame C, and a movable lamp holder
or bracket D pivoted at its lower end on a horizontal axle X-X and carrying
at its upper end a roller 2 on which. is coiled, the wire rope or lamp cord S,
before it passes over the said guide rollers 3 to 8 mounted on the stationary holder C

page_text: or on the lamp post B. The outer guide rollers (6 and 8) may be concealed and
protected by ornamental covers.
In Figs. 1 and 2 the lamp holders or brackets C and D are lyre shaped and
symmetrical to the axis of the lamp post, which coincides with axis of the lamp,
and the wire rope S is in tension.
The movable frame D is loose on its axle, but connected with the same by a
pair of wire springs f, f, coiled' at one end on the said axle and fixed at the
other end to the frame D; these springs are so arranged that they have a
tendency to turn the frame D out of its vertical position. Consequently, when
the wire rope S slackens at the winding gear, the said springs f, which had been
kept in equilibrium by the tension of the rope, will turn the movable bracket into
the position D shown in Fig. 3.
If the suspension rope S is wound off still more by the winding gear, the
lamp A begins to descend vertically and continues this motion 'until it has arrived
a short distance above the ground, when the carbons can be conveniently' renewed
or the lamp cleaned.
The arm D carries in addition to the roller 2 a small roller 1 placed above the
roller 2 at such a distance that the rope will easily pass between the said rollers,
but not the ball weight 13 which 'is' fixed to the end of the rope S above the
lamp A.
If, after the lamp 'A has been raised into the position of Fig: 3, the rope S is
wound up still further, the said ball weight will press against the rollers and
thereby lift the arm D until (if the winding be continued) the pivoted arm D' has
returned to its normal vertical position represented by Figs. 1 and 2.
.
In Fig. 3 the parts which share this motion are distinguished by indices added-
to the corresponding letters of reference on Figs. 1 and 2.
In order to limit the pivotal motion of the arm D, the latter is provided with a
pair of lugs m, m and the stationary arm C with abutments n, n, said lugs and
abutinents being arranged to' come into contact with each other and thereby to stop
the arm D when the latter reaches either of its extreme positions shown by Figs. 1
and 3. A cap k serves to cover the rollers 1 and 2:
In the modified holder represented by Figs. 5 to 7, the stationary 'arm' E. and
movable bracket F are one-sided or unsymmetrical, and the latter is pivoted on a-
horizontal axle y-y. The base of the arm F has two flat faces p and q at an
obtuse angle to each other, one face pabutting against the top of the column B,
when the arm F is in the lowered position of Fig. 7 while the other face q forms
an abutment and support when the arm F is in its upright position, Fig. 6. These
two faces thus serve to support the arm F in its extreme positions and to prevent
its turning beyond the desired limits.
:
The upper extremity of the movable arm F carries a bell-shaped hood 6 suspended
from a horizontal axle z ż and serving as an abutment for the lamp A. If the
holder is in the lowered position shown by Fig. 7, when the lamp is drawn up by
winding its suspension cord S on the winding gear situated at the base of the
column B, the roof of the lamp A will come in contact with the bell b-and press the
latter upward, in consequence of which the arm F will rise into its normal position
shown by Figs. 5 and 6. The ball weight at the end of the rope S, as shown in
Fig. 3, is therefore omitted.
The suspension cord or rope S is guided over rollers 9, 10, 11 and 12, as shown
by Fig. 7.
The springs, f, tend to press the arm E from its normal position (Fig. 6) into
the lowering position shown in Fig. 7.
As will be noticed from the drawings, the guide rollers on the movable and
on the stationary arm or bracket are so arranged that the movable arm cannot
be turned out of its normal position (in which the lamp is vertically over the
axis of the lamp post) without increasing the length of the rope situated above
the winding gear, which is effected by allowing the rope to run off the winding
gear.

page_text: 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 holder for electric street lamps and other large lamps, comprising in its.
construction a stationary arm, bracket, or frame, a movable arm or frame adapted
to move sideways from its normal position within given limits, and a suspension
rope or chain guided over rollers mounted on the said arms or frames, and connected
with a suitable winding mechanism, the whole being adapted to operate substantially
as described.
2. The combination of a hollow lamp post or column, with a lamp holder com-
prising in its construction a stationary frame or bracket mounted on the same, a
movable arm or frame adapted to move sideways within given limits, a suspension
rope or chain passing over guide rollers to a suitable winding mechanism situated
near the base of the lamp post or column, and springs adapted to displace the
movable arm from its normal position into its lowering position, the whole being so
arranged that when in the normal position of the holder the rope or chain is.
slackened or unwound, the movable arm will first move sideways, after which the
lamp will descend vertically, and that in winding up the rope or chain after the
lamp has reached its lowest position, the lamp is first drawn up vertically and will
then cause the movable arm to return to its normal position, substantially as.
described with reference to the drawings.
3. The combination of a stationary arm, bracket, or frame, with a movable arm
or frame adapted to turn on a horizontal axis within given limits, so as to assume an
inclined position, a suspension rope or chain passing over a series of guide rollers to.
a suitable winding mechanism, and springs adapted to turn the movable holder:
from its upright into its inclined position, the guide rollers being so arranged on
the movable arm and on the stationary arm that, to allow the movable arm to turn
from its upright into its inclined position, the said rope or chain must be slackened
or lengthened, and that in the normal position of the holder the tension of the said.
spring is counteracted by that of the suspension rope or chain, substantially as
described.
1011 1. of Anil 1896
FAIRFAX & WETTER,
433, Strand, London, Agents.