Escapement for Timekeepers. Page: 2 of 3
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UNITED STATES PATENT OFFICE.
JOSIAH BISHOP, OF AUSTIN, TEXAS.
ESCAPEIYIENT FOR TIMEKEEPERS.
Specification of Letters Patent No. 21,738, dated October 12, 1858.To all whom it may concern:
Be it known that I, JosIAi- BisIor, of
Austin, in the county of Travis and State
of Texas, have invented a new and useful
5 Improvement in Watch, Clock, and Chro-
nometer Escapements; and I do hereby de-
clare that the following is a full, clear, and
exact description of the same, reference be-
ing had to the annexed drawings of the
10 same, making part of this specification.
Figure 1 is a side elevation of the scape
wheel, balance wheel, and the parts of a
clock in immediate connection therewith.
Fig. 2, is a top or bird's eye view of do.
15 Similar letters in the figures., refer to cor-
responding parts.
The nature of this invention, consists in
so forming the detents on the lever and ar-
ranging them in relation to the notches of
20 the scape wheel and pallets on the balance
arbor, as to render the movements of the
clock or watch, to which they are attached.
more regular and less liable to get out of
order.
25 To enable others skilled in the art to make
and use my invention, I will proceed to de-
scribe its construction and operation.
The balance wheel A, balance spiral or
helical spring B, arbor C, scapement wheel
so and shaft D. and the main driving parts are
made in the usual or most approved manner.
The detent lever E, is suspended on a shaft
a, between suitable studs in the frame of the
clock in an inclined position, as represented
35 in Fig. 1, and is provided at its lower end
with a detent F, which projects downward
at right angles from its lower end the re-
quired distance to enable it at the proper in-
tervals to be brought within the are of the
40 notches of the scapement wheel, for the pur-
pose of arresting the motion of the same,
one side of said detent being curved to
facilitate its detachment from said notches.
This detent is pressed within the traversing
45 arc of the scape wheel, by means of a spring
G, secured at one end to a portion of the
frame in front of the detent, its flexible end
extending under a pin H, projecting from
the side of said detent, in such a manner as
50 to allow its upward elasticity to be exerted
against the pin II, and to force the detent at
the opposite end downward, the downward
movement being regulated by a set screw I,
passing through a projection of the lever E,
55 above the detent, whose end comes in contactwith a stud J, secured to the frame. A de-
tent spring K, is secured to the lower edge
of the detent lever immediately in advance
of the detent F, the flexible portion of which
spring extends beyond the end of the lever. 6o
diverging somewhat from its course, and
resting upon a horizontal pin p. projecting
from a bar secured to the side of the lever in
such a manner as to enable the pallet L, on
the balance arbor C, as it rotates to the right, 65
to raise the end of the spring K., and pass
by the same without affecting the lever E,
and as it oscillates backward to press upon
the end of the said spring and to depress it
and move the corresponding end of the de- 70
tent lever, and in this manner detach the
stop detent F, from the notches of the scape-
ment wheel. The main pallet M, of the ar-
bor shaft extends from the same. in the rear
of the smaller pallet L. but on the same ra- 75
dial line, its outer end extending sufficiently
far to enable it to enter the arce of the circle
in which the notches of the scapement wheel
rotate, in such a manner as to enable the said
notches to press against its edge, to give -the 80
required degree of oscillation to the balance
wheel, its extent being regulated by the ten-
sion of the spiral or helical spring B, and
the curved edge b. of an indentation formed
in a wheel c, secured to the balance arbor or 85
shaft C, coming in contact with the curved
angular end of a strip d, secured to the top
of the detent lever E, and projecting the re-
quired distance beyond the end of the same,
to enter the depression, when the lever is vi- 90
brated by the pallet L.
The operation of this improved escape-
ment is very simple. The oscillations of the
balance arbor shaft C, may be produced by
helical or spiral springs as described, or by 95
pendulum as may be desired. The oscilla-
tion to the right causes the pallet L, to
raise the end of the spring K, without
affecting the detent lever E. On its return
oscillation however, it strikes on top of the 100
spring K, and depresses the end of the de-
tent lever E. and disengages the detent F,
from the end of the notch of the scape-
ment wheel resting against it, which enables
the said scapement wheel to rotate, carry- 105
ing with it the main pallet M, by the action
of another notch on its edge; thus giving a
fresh impulse to the balance arbor C. Dur-
ing this movement the angular curved end
of the lever E, enters the indentation in the 11u
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Bishop, Josiah. Escapement for Timekeepers., patent, October 12, 1858; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth165062/m1/2/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.