Electric Clock. Page: 2 of 3
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UNITED
STATES
PATENT OFFICE.
hENRY IVERSEN, OF CORSICANA, TEXAS
ELECTRIC CLOCK.
SPECIFICATION forming part of Letters Patent No. 643,506, dated February 13,1900.
Application filed August 3, 1899. Serial No, 726,023. (No model.)To all whoi it m ay comLce7i
Be it known that I, HENRY IVERSEN, a citi-
zen of the United States, residing at Corsicana,
in the county of Navarro and State of Texas,
5 have invented new and useful Improvements
in Electrically-Operated Clocks, of which the
following is a specification
My invention relates to electrically-oper-
ated clocks, my object being to provide sim-
io pie and comparatively inexpensive means by
which one or more clocks arranged at differ-
ent and mnoreor less widely separated points
may be actuated in perfect synchronism with
a single controlling-clock. It is my purpose
15 to simplify, improve, and reduce the cost of
constructing and operating clocks of this
type; and my invention consists in the novel
features of construction and new combina-
tions of parts hereinafter fully explained and
20 then particularly pointed out and defined in
the claims which terminate this specification.
To enable others to understand and to make
and use my said invention, I will now de-
scribe it in detail, reference being had for this
25 purpose to the accompanying drawings, in
which-
Figure 1 is a face elevation of a controlling-
clock and a single clock driven by electric
energy synchronously with the controlling-
30 clock, a part only of the mechanism of the
second clock being shown. Fig. 2 is a detail
view, upon a larger scale,of the circuit-breaker
forming part of the controlling-clock.
The reference-numeral I in said drawings
35 indicates the controlling-clock, which may be
of any preferred form of that type of clock
in which a pendulum is used The clock 1
is provided with a pendulum 2 of the usual
construction, and in the present instance this
40 is shown as inclosed in a case 3, part of which
is broken away to show the position of the
circuit-breaker. This device, which is shown
in Fig. 2 in detail, consists, essentially, of two
electrical contacts 4 and 5, the contact 4 con-
45 sisting of a light elastic strip of conducting
metal rigidly mounted at one end upon an
insulating-block 6, its other end being free
to vibrate. The contact 5 is a screw formed
also of suitable conducting metal and tapped
50 through an arm 7 at such a point that the
end of the screw will be normally in touch
with the contact-strip 4 at a point not farfrom the middle of the latter, the engagement
of the two contacts being maintained by the
elasticity of the strip 4, while the adjustabil- 55
ity of the screw 5 enables it to be so placed
that said strip will bear upon its end very
lightly. For convenience these contacts may
be mounted upon a bracket or base 8, of which
the arm 7 forms part. The bracket is ar- 6c
ranged within the casing 3 at such a point
that the pendulum of the clock as it com-
pletes its movement in one direction will abut
against the end of the elastic contact 4 and
move or bend it sufficiently to remove it from 65
touch with the end of the screw 5. As the
pendulum swings in the opposite direction
the contact 4 by its own elasticity again re-
sumes its engagement with said screw and
maintains it until the next stroke of the pen- 70
dulum, when the operation is repeated. By
this action of the pendulum the circuit of
which the contacts 4 and 5 form part is broken
at each stroke and immediately reestablished.
The numeral 9 denotes the casing of an 75
electrically-operated clock, the dial and gear-
ing, with the exception of the first wheel of
the train, being omitted, as these may be
of any preferred construction. The clock is
operated by the intermittent or step-by-step 8o
revolution of a ratchet-wheel 10, which is held
against retrograde movement by a pawl 12.
The step-by-step revolution is produced by an
elbow or L shaped lever 13, having a pivot or
fulcrum 14 near the end of one of its arms, the 85
end of the other arm lying near the edge or
teeth of the ratchet 10 and being provided
with a pawl 15, which engages the ratchet-
teeth, being lightly pressed against them by
suitable means, such as an arm or weight 16, 9o
forming part of said pawl and lying on the
other side of its pivot. The extremity of the
arm in which the fulcrum 14 is located is
acted upon by a spiral or other spring 17, hav-
ing sufficient strength to raise the arm carry- 95
ing the pawl 15, so that the latter can effect
a new engagement with the tooth of the
ratchet next to that which it previously en-
gaged. The pawl-carrying arm of the lever
is guided in this movement by a loop or keeper zoo
18, and the upward movement of the lever
may be arrested at the exact point necessary
in order to insure the proper engagement of
the pawl 15 by a set-screw 19, which is tapped
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Iversen, Henry. Electric Clock., patent, February 13, 1900; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth511905/m1/2/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.