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UNITED STATESPATENT OFFICE.
WILLIAM S. GUTHRIE, OF TERRELL, TEXAS.
SECONDARY ELECTRIC CLOCK.
To all whom it imayj concern:
Be it known that I, WILLIAM S. GUTHRIE,
a citizen of the United States, residing at
Terrell, in the county of Kaufman and State
5 of Texas, have invented a new and useful
Secondary Clock, of which the following is a
This invention relates, in a specific sense,
to improvements in clocks of the type that
10 are controlled in their movements by master
clocks, though the structure is also useful in
other analogous relations.
The principal object of the present inven-
tion is to provide novel means of an exceed-
15 ingly simple nature, that will effect a certain
predetermined movement of the driven mem-
bers or hands, and will effectively prevent
any abnormal movement of the same, the
structure being such that it is not liable to
20 derangement or excessive wear, and is thus
peculiarly useful as a secondary clock.
A further and important object is to pro-
vide a novel structure, wherein the parts are
readily and relatively adjustable in order to
25 secure their proper coperation to effect the
The preferred form of construction is illus-
trated in the accompanying drawings, where-
30 Figure 1 is a side elevation of the mechan-
ism. Fig. 2 is a top plan view of the same.
Fig. 3 is a vertical longitudinal sectional
view. Fig. 4 is an end elevation of the upper
portion of the same, a part of the lever be-
35 ing shown in section. Fig. 5 is a detail view,
showing a slightly modified arrangement of
the magnets and coacting armature.
Similar reference numerals designate cor-
responding parts in all the figures of the
In the embodiment illustrated in the first
four figures, a frame 6 is employed, compris-
ing sides 7, connected by tie elements or
posts 8. This frame has suitable feet 9,
45 whereby it may be secured to a support. A
driven member is journaled in the frame,
and comprises a shaft 10, having a toothed
wheel 11, fixed thereto. The present em-
bodiment of the invention is a secondary
50 clock, and consequently hands 12 and 13 are
employed, the hand 12 being secured to one
end of the shaft 10, the hand 13 being rota-
tably mounted on said shaft and operated
'therefrom through suitable gearing 14. The
Patented May 28, 1907.
hand 12 is preferably counterbalanced by a 55
weight 15, secured to the shaft 10.
The means for actuating the driven mem-
ler and thereby the hands is as follows. A
lever 16 is fulcrumed between its ends, as
shown at 17, the fulcrum 17 being carried by 6o
links 18 pivotally mounted at 19 upon the
side elements 7 of the frame. These links,
while adjustable, are normally held by their
frictional engagement with the frame, against
movement, and thus the fulcrum can be ad- 65
ousted upon the frame. One arm 20 of the
lever extends alongside the driven wheel 11,
and has pivoted between its ends, a weighted
actuating dog 21, the tooth 22 of this (og be-
ing arranged to engage the teeth of the 70
driven wheel 11, and being held in engage-
ment therewith by the weighted end 23.
The lever is actuated by one 'or more elec-
tro-magnets 24, secured to one end of the
frame and having an armature 25 coacting 75
therewith, said armature being carried by the
arm 26 of the lever, which arm is weighted,
as shown at 27. Any suitable means may be
employed for periodically effecting the ener-
gizing of the magnets, an example of such 8o
means being set forth in co-pending applica-
tion, Serial No. 276,233. It will thus be
evident that when the magnets are energized,
the armature 25 will be drawn toward them,
thereby swinging the lever and causing the 85
dog 21 to move the wheel.
Instead of the magnets shown in Figs. 1-4
inclusive, the arrangement disclosed in Fig. 5
may be employed. These magnets are des-
ignated 24a, and have poles 24, provided 90
with curved end faces 24. The armature
cooperating with the poles, is shown at 25,
and is mounted on a fulcrum 17, to which
the faces 24c are substantially concentric.
In this modification, the armature 25" con- 95
stitutes an arm of the actuating or support-
ing lever, a portion of the other arm being
shown at 20, and carrying the actuating log
for the driven wheel, as will be understood.
It will be evident that the operation of this 100
structure is precisely the same as that first
In order to prevent retrograde movement
of the driven member or wheel 11, a log 28 is
employed having a tooth 29 that engages the 105
teeth of the wheel 11. This dog 28 is piv-
oted at its rear ends on an adjustable sup-
port, in the form of a link 30, pivotally
Specification of Letters Patent.
Application filed July 5, 1906, Serial No, 324,809,
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Guthrie, William S. Secondary Electric Clock, patent, May 28, 1907; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth510968/m1/2/: accessed June 25, 2019), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.