The information on this page was put together by my partner Ken Kerr. It lists known examples of electric clocks with power backup. If you have any additional information, please feel free to contact Ken directly at <KKER@Voyager.net>.
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Electric
clocks with power backup |
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TYPE
I |
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Designed
to address unstable A/C frequency or long term power outages or DC Mains
power - or any combination of this. |
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Their
timekeeping is based upon traditional mechanical clocks- balance or
pendulums |
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TYPE
II |
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Designed
to address short term power outages- the main timekeeping is accomplished
by a synchronous motor with a mechanical emergency backup . |
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The
backup is typically not a precision timekeeper. These clocks are limited
to A/C operation only. |
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Based
upon these types I have provided a initial list of manufactures of these
clocks, the types they made and some general descriptions of each. |
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There
is much to be learned here and any additions and or corrections would be
appreciated. |
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My
Email add is: |
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Mail: |
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Kenneth
Kerr |
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531
East Main St |
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Eaton,
Ohio 45320 . |
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Phone |
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937
4562310 |
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Current
list "RULES" |
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Only
clocks designed to operate directly from "Mains" current are
included. |
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Clocks
that used mains current through a power supply (even if the power supply
was original to the design- IE, not battery operated), are not included at
this time. |
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When,
and if included, I will; probably add another "type" to cover
them. |
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TYPE
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Herschede
/ Revere |
clock
types |
Strike |
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market
type |
voltage |
Balance
/ pendulum |
Wind
/ drive system |
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(Herschede
owned the Revere name) |
Hall |
Chime
and hour |
Home |
110
V AC |
Pendulum |
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Spring
drive for the time- synchronous motor for strike and chime / various ways
to wind. |
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typically
used a "balancing spring force" method to sense when wound. |
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Shelf |
Chime
and strike, hour strike only |
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Home |
110
V AC |
Pendulum |
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Same
as above |
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Comments: |
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Herschede
made these in many varieties - none quite the same- most varied of all of
the manufactures of these clocks both in types and movements. |
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Imperial
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clock
types |
Strike |
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market
type |
voltage |
Balance
/ pendulum |
Wind
/ drive system |
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Wall
square case |
Time
only |
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Business |
110V
AC, DC and other voltages possible |
Balance-
7 jewel platform |
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Spring
drive wound by a heavy lever which stops winding when the lever no longer |
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can
overcome the spring- contacts are at the bottom of the lever. |
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The
lever is reset by two coils through the contacts |
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Wall
- Banjo |
Time
and strike |
Home |
110V
AC |
Balance-
7 jewel platform |
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Spring
drive for the time- wound by the strike motor when the clock strikes |
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Comments: |
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The
motor has power all of time and is stopped by the strike mech. |
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The
banjo is not common- there is evidence to indicate that Imperial replaced
most of the Banjo's movements |
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with
a two motor (one for time, one for strike) synchronous only movement
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