Year: 1885

page_text: We, CHARLES FREDERIC COOKE, Scientific Instrument Maker, Bucking Works,
York and THOMAS, ROBINSON 6 Queens Place Chapel-Allerton Leeds both in the
County of York do hereby declare the nature of this Invention to be as follows:-
In an apparatus arranged or constructed according to this Invention we use a
solenoid the coil of which is of coarse wire and carries all or nearly all the current.
The soft iron core of the solenoid is connected by the rod with a lever pivotted to
the frame work of the lamp while a little within the pivots of this lever the lever
itself carries by means of pivots carried thereby a spindle on which are mounted
a pinion and a ratchet wheel the two together not being able to rotate in one
direction without driving round a spur wheel which is mounted on the same
spindle. The rack or carbon carrier has teeth cut in that side which comes against
the before mentioned pinion, the rack and pinion being thus in gear. The before
mentioned spur wheel gears into a second pinion upon the axis carrying the second
wheel of a train of wheels, the second axis being mounted on bearings carried by
the fixed frame work of the lamp The action of the mechanism is as follows.-
When the current first passes, the soft iron core is drawn up into the coil of the
solenoid and the lever is lifted up about the centre on which the lever turns and
the pinion rising with it raises up the rack or carbon holder with which it is in
gear to an extent sufficient to strike the are between the carbons of the lamp
The angle through which the lever travels is not so large as to sensibly affect the
amount of gear between the rack and pinion or between the before mentioned spur
wheel and the fixed second pinion before mentioned. Thus this method of striking
the arc, by making use of an upward movement of the first pinion in the train does
not interfere in any way with the action of the train. The spur wheel may be a
worm wheel if necessary gearing into a vertical worm or tangent screw in such a
manner that when the worm wheel rises with the pinion it will roll up the worm
by the amount of lift imparted to it.

page_text: We CHARLES FREDERIC COOKE Scientific Instrument Maker, Buckingham Works
York and THOMAS ROBINSON, 6 Queens Place Chapel-Allerton, Leeds both in the
County of York 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:-
This Invention relates to the combination with an are lamp for striking the arc,
of a lever pivotted to the framework of the lamp and carrying within itself the
first arbor wheel and driving wheel of the escapement all as hereinafter more fully
described. The accompanying drawing represents in elevation in Figure 1 and in
sectional plan in figure 2 so much of the mechanism of an arc Lamp as is necessary
to illustrate the application of the Invention.
P
In an apparatus arranged or constructed according to this Invention a solenoid S
is used the coil of which is of coarse wire and carries all or nearly all the current
to the Lamp. The soft iron core S of the solenoid is connected by the rod B with
a frame like lever L pivotted to the frame work X of the lamp by the pivots C
while a little within the said pivots C the lever itself carries by means of pivots P
a spindle on which are mounted but not keyed a pinion p and a ratchet wheel r
fixed together, the two together not being able to rotate in one direction, without
driving round a spur wheel W which is mounted and keyed on the same spindle Q
This is effected by the pawl w centred to the wheel W and engaging in the ratchet
teeth of the wheel r so that when the pinion p rotates in the direction of the
arrows that is to say when the rod R descends the wheel W is rotated-The
carrier R of the moveable carbon has teeth cut in that side which comes against
the pinion p the rack R and pinion p being thus in gear. The spur wheel W gears
into a second pinion p upon the axis p³ carrying the second wheel p' of a train of
wheels the said axis p³ being mounted on bearings or pivots p' carried by the fixed
frame work of the lamp In the drawing the lever L is shewn at the lowest point
of its stroke It is counterweighted at L². The action of the mechanism is as
follows When the current first passes through the lamp the soft iron core S is
drawn up into the coil of the solenoid S and the end of the lever L attached to the
rod B is lifted up above the centres C on which it turns and the pinion p rising with
it, it raises up the rack or carbon holder R with which it is in gear to an extent
sufficient to strike the arc between the carbons of the lamp, at the same time the
spur wheel W rolls slightly upon the pinion p-The angle through which the
lever L travels is not so large as to sensibly affect the amount of gear between
the rack and pinion or between the spur wheel W and the pinion p². Thus this
method of striking the arc by making use of an upward movement of the first
pinion in the train does not interfere in any way with the action of the train The
spur wheel W may be a worn wheel if necessary, gearing into a vertical worm or
tangent screw (in place of the pinion p²) in such a manner that when the worm
wheel rises with the pinion p it will roll up the worm by the amount of lift

page_text: imparted to it-The liberation of the train of wheels or escapement so that the
carbons may approach is effected by the particular governing mechanism which
may be used in the lamp and the arc striking mechanism above described in no
way interferes with the governing mechanism or train or escapement of the lamp.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is
In the arc striking mechanism of arc electric lamps the lever L pivotted or
centred to the frame or some fixed part and carrying the first arbor pinion and
driving wheel of the escapement of the lamp substantially as hereinbefore described
and illustrated in the accompanying drawings.