THE SETH THOMAS 115D:

THE SETH THOMAS 115D:
The seth thomas 115d is a ships strike round mechanism. It Has a
non-imported balance wheel unit . It uses a cam in the idler gear to make odd count
lifts lever that catches hammer. gravity-spring-counter weight return on rack.
].010in.spring.
spring loaded rack index end pops back in case mechanism runs down this spring ..021in..brass.
Trip lever return:.013in.brass;-.010in.inside plate on this also. Hammer return spring
.016in.;
brass.Be sure there is at least 180 degrees of rotation on the warning wheel after the
warning position; or the odd hour strikes will be erratic because the hammer catch wont
always hook.
In the event that the balance wheel unit on this clock is damaged beyond repair,
an old popular european mechanism PIN lever platform escape unit will work ; the escape wheel will have to be turned over on its shaft because the gear train of the seth
thomas turns the opposite direction of the popular european mechanism mechanism. The pinion
gear tooth count is 8 leaves , the same
is in the orig. seth thomas. The regulator device needs to be modified to fit in the slot
on the dial. A small hole drilled in the regulator arm of the popular european mechanism
unit with a taper pin carefully riveted in will work just fine. The popular european
mechanism
unit will just fit under the dial. The
mounting holes do not fit exactly ; however some careful modifications will allow the
use of the popular european mechanism platform escape unit. It must be a pin lever though
because the unit with the jeweled fork will see the escape wheel backwards unless the jewels
are reversed , which i haven’t tried.