Improvements appertaining to Electric-arc-lamps.
Year: 1899

page_text: Date of Application, 11th Mar., 1899
PROVISIONAL SPECIFICATION.
Improvements appertaining to Electric-arc-lamps.
I, HARRY BENNETT, of 2, Sarah Street, Keighley, in the County of York,
Electrical and Mechanical Engineer, do hereby declare the nature of this invention
to be as follows, that is to say:-
It relates to electric-arc-lamps of the class wherein the carbons are adjusted
relatively with each other by the actions of a solenoid and my said invention
consists in the employment of parts so constructed that they are rendered more
serviceable and less liable to become inoperative than are those devices wherein
differential gripping levers are employed.
In carrying my invention into effect I arrange the movable carbon holders so
that when they are free they will move towards each other until the carbons are
brought together on which the solenoid is made to act to separate said carbons
and hold them the desired distance apart.
The carbon holders above referred to are arranged to slide in their bearings so
that by their own weight or that of a counterbalancing weight they may move
when free to come together. In accordance with the arrangement in which the
holder for the carbon is raised by a counterbalancing weight until its carbon
is brought into position with the other or stationary carbon, the cord, chain or
Hexible coupling piece upon which the weight is suspended, passes over a grooved
or otherwise prepared pulley to which a drum is secured so that an appropriately
formed gripping lever may be made to act upon said drum whenever operated by
the solenoid, while in connection with the arrangement wherein the carbon
holder falls by gravity, a cord or strap is secured to it in such a manner that it may
be carried once or more times around the grooved or otherwise prepared pulley in
order that the retracting actions of the solenoid may act thereon as desired.
To keep the gripping lever at all times in proper contact with the drum referred
to so that whenever the solenoid moves its actions may be immediately trans-
mitted to the drum, appropriate retracting spring devices are arranged in con-
nection with said gripping lever in an appropriate position relatively with its
drum.
In order that unnecessary vibrations may be prevented, I arrange an appropriate
dash-pot or suction box to be coupled to said lever to control its actions.
Under certain conditions racks and pinions may be used in place of the cords
and grooved or otherwise prepared pulleys.
Dated this 10th day of March 1899.

page_text: Improvements appertaining to Electric-arc-lamps.
1, HARRY BENNETT, late of 2, Sarah Street, Keighley, in the County of York,
but now of 32, Ethel Street, Beechcliffe, Keighley, aforesaid, Electrical and
Mechanical Engineer, 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, that is to say :-
It relates to electric-are-lamps of the class wherein the carbons are adjusted
relatively with each other by the actions of a solenoid and my said invention
consists in the employment of parts so constructed that they are rendered more
serviceable and less liable to become inoperative than are those devices wherein
differential gripping levers are employed.
In order that my said invention may be readily understood, I have, hereunto
appended sheets of drawings illustrative thereof, to which, by figures and letters,
reference is made in the following description.
Figs. 1 and 2 are side and end elevations respectively of an electric-arc-lamp
having my improvements applied thereto.
Fig. 3 is a sectional plan on line A-B of parts illustrated by Fig. 1.
Figs. 4 and 5 are similar views to Figs. 1 and 2 respectively, but. illustrate.a
modified form of my invention as applied to another form of arc lamp to that
shown by Figs. 1 and 2.
Fig. 6 is a side elevation of a portion of an electric-arc-lamp, and shows the
application of my improvements to a further different form of lamp.
Figs. 7 and 8 are sectional elevation and plan respectively, drawn. to. an enlarged
scale, of the gripping level and the parts in connection with which it operates.
Figs. 9 and 10 are detail drawings, also enlarged scale, hereinafter referred to
Similar letters and figures of reference indicate similar parts throughout the
several views.
In carrying my invention into effect, I arrange the holder a³ for the carbon.a,
which (said holder) moves along its guides or supports a a³, to descend by gravity
so that said carbon may move towards or come into contact with the lower carbon b,
while it is raised or separated and held the desired distance from said carbon b
by the actions of the solenoid c. The core of the solenoid c is connected by
means of the rod to the lever d, which is pivotted at d in the movable bearings e,
and is provided with a cam surface for gripping the barrel . of the pinion f.
The said pinion f is carried by the pin or stud f mounted in the,,bearings g,.and
gears with the rack which is connected to the carbon holder a, as shown by
Figs. 1, 2 and 3.
It will thus be seen that supposing the upper carbon a descends into.contact
with the lower one b, the core c' of the solenoid c will be raised in the well known
manner, and will thus raise the lever and cause its cam surface to. be pressed
against the barrel f', in this manner the barrel will be slightly rotated, and the
rack h and carbon holder a will be raised so as to move the upper carbon a a
sufficient distance away from the lower one, while as said carbons wear away, the
regulating actions of the solenoid and its core e will be transmitted by the above
described means to the carbon holder a¹, and so the positions of the carbons
relatively with each other will be automatically adjusted by the upper carbon as
being allowed to slowly descend as will be well understood.
Instead of making use of the pinion and rack above described, I may employ
pulleys around which takes a cord, band or chain m connected to the upper
carbon holder a, said pulleys kk being arranged in bearings respectively,

page_text: (see Figs. 4 and 5). The lever d is mounted to operate in connection with the
barrel of the pulley k in a similar manner to the described in relation to the
barrel f, and the movements of the solenoid's core care, in the form of lamp
shown by Figs. 4 and 5, transmitted to said lever by a supplementary lever n
and rod n¹.
In arc-lamps wherein the lower carbon b and its holder are raised by the
counterbalancing weight and the upper carbon a remains stationary, the cord,
band or chain m is passed over the pulley (see Fig. 6) the barrel of which is
acted upon by the lever d as herein before described.
To keep the gripping lever d and the bearings in position so that whenever
the solenoid's core moves its actions may be immediately transmitted to the
drum for k, the retracting spring p is mounted in bearings pas shown to
press against the movable bearings e, the solenoid transmitting motion to this
lever d, whilst its return is effected by the spring p.
In order that unnecessary vibrations may be prevented, I arrange a dash-pot
or suction box g the piston q2 of which is coupled by the rod q' to the lever d, or
to the lever n, as shown by Figs. 4 and 5.
It will readily be seen that in addition to the forms of arc-lamps above
described, my said invention may be equally well and in a similar manner applied
to those arc-lamps known as focussing lamps," or those wherein both of the
carbons and their holders move towards each other and so keep the position of
the are constant, this result being attained either by counterbalancing the lower
carbon holder by an additional weight or by constructing the upper one to be of
sufficient weight to raise the lower one as desired, in the manner well known.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
In electric-arc-lamps, means or mechanism for regulating the movements of
the carbons and their holders, the same being constructed and arranged to operate
substantially as herein specified.