Improvements in or relating to Telephone Call Boxes.
Year: 1889

page_text: Date of Application, 5th Feb., 1889
Complete Specification Left, 24th ept., 1889-Accepted, 26th Oct., 1889
PROVISIONAL SPECIFICATION.
Improvements in or relating to Telephone Call Boxes.
A communication from abroad by AMENZO GRIFFITH, of Springfield, Broker, HENRY
ANDERSON BURBANK, of Westfield, and WILLIAM HERBERT JORDAN, of
Springfield, Broker, all of County of Hampden, State of Massachusetts, United
States of America.
I WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E. of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool and 6 Bank Street, Manchester, both in
the County of Lancaster and 323 High Holborn in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
"
"
subscribed
The object of the prosont invention is to provide means whoreby a
using a telephone may avoid the present special operation of "ringing off" as it is
termed, or in other words, when, through using the telophone temporarily establishing
the proper connection with the central offico annunciator and by the turning of the
magneto shafts, sending a magneto current through such connection to notify the
central office that his use of the telephone has been finished, and in more direct
terms the purpose of the invention is to provide mechanism which may be interposed
between the telephono receiver supporting arm and the driving shaft of the magneto
which will not interfere with all the usual operations of the telephone as at
present carried out, and yet on the downward movement of the receiver arm on the
hanging of the receiver thereon will cause, or permit, through the downward
movement of said receiver arm, a second operation of the magneto to signal the
central office, the proper electrical circuit connection including the magneto and
the central offico annunciator at such time being automatically established; and the
invention consists in the construction, combination, and arrangement of various
parts, all substantially as will hereinafter fully appear and be set forth in the claims.
The present invention is shown in the accompanying drawings as applied on the
telephone call-box of the well known form at present in general and universal use
throughout the country, and it will be here observed that the parts constituting
said call-box and signalling apparatus are in no material manuer changed, all con-
nections and circuits being as usual, and in said drawings Figure 1, is a front
elevation of a subscriber's call-box, with the lower portion of the front or cover
broken away and some parts in section, and showing the automatic "ringing off"
device, as applied in operative relation to the usual mechanism einbodied in said
call-box, the said parts being in their positions of disuse, the receiver holder arm in
its lowermost position, or the one it is made to occupy when the receiver is hung
thereon and the magneto connections "short circuited."
Figure 2, is an elevation similar to Figure 1, at the lower part of the call box, but
showing the parts in their positions at the time the receiver holder arm is passing
from its uppermost to its lowermost position, at which time the "ringing off" will be
automatically effected.
Figure 3, is a perspective view in detail to be hereinafter referred to, while
Figures 4 and 5, are, respectively, a vertical and a horizontal section of portions
of the mechanism, taken on the lines 4 4 and 5 5 of Figures 1 and 2, and which will
be hereinafter referred to.
Figure 6, is a side elevation of the call box illustrating a modified form of the
receiver holder or support.
The shaft A, for securing through the crank handle 10, the rotation of the
armature of the magneto through means of its gear 12, meshing with a pinion 13,
on the spindle 14, of the rotary armature, at its passage through the side wall of the
box B, is surrounded by a drum C; and to the shaft within said drum, one end of

page_text: an involute band or clock spring 15, is securel, a sufficient number of coils thereof
being disposed between its secured end and its outer end portion which is unsecured
but bears with a spring pressure against the inner walls of the drum.
On a turning of the shaft A, to generate a magneto current to signal the central
office, for instance in the direction of the arrow, Figure 4, from the centrifugal
spring pressure of the outer end of the coil on the wall of the drum. the said coils
will not immediately be turned in consonance with the shaft, but will be more or less
wound up and capable of an increasel recoil, but after a certain extent of rotation
of the shaft, the spring may drag by its outer and around on the wall of the
drum, whereby a continued and indelinite rotation of the shaft to operate the magneto-
electric generator may be had without hindrance by or further effort on the spring,
but on a release of the force applied to rotate the crank, under the recoil of the said
spring, the shaft will be rotated in the reverse direction and a second magneto
current will be generated.
A sliding shatt D, is constrained to move horizontally and withont rotation through
supporting lugs a b, supported from the Ụ magnets of the generator or from other
suitable part, its one end being provided with a spring pawl, d, in position for
engagement at the
proper times with a ratchet wheel 16, which is fixed on the shaft A.
As will be seen in Figure 5, the said pawl loosely encircles the slide shaft D, and is
capable of a partial rotation thereon to an extent regulated by the fixed radi il pin 18,
on the shaft, and the slot 19, in the walls of the pawl through which said pin enters,
and a spiral spring 20, is applied between the lug a and the pawl to perform the
double duty of foreing the shaft outwardly towards the ratchet and also partially
rotating the pawl on its shaft so that it tooth will normally lie below the roots of the
ratchet teeth; the said spring for the accomplishment of these functions is by one
end portion made to embrace the said lug, then to encircle the shaft between the lug
and the pawl and by its other end fastened to the pawl outside of its contre of
rotation.
The lug b, is hent on itself at right angles and extended horizontally in a slotted
or bifurcated bracket e outside of the shaft D, between the legs of which is a post /,
fixed on and carried by said shaft, and which post by its sides hears on the inner
walls of the bracket legs and affords means for preventing the rotation of the said
sliding shaft.
The said post is proferably bushed with a friction sleeve 21, and is extended out-
wardly beyond the plane of the bracket e, receiving, preferably, another and suparate
friction sleeve 22, of reduced diameter." One particular formation of the duplex
sleeved post is shown in Figure 5, the sleove parts being held in place by the healed
axial pintle 23, passing through said sleeves and the shaft. One or both of the sleeves
might be dispensed with on the post, which however, would be formed of the proper
diainator, but for obvious reasons the sleeve provision is preferred.
Upon the usual swinging receiver holder arm E, a rigid angular bracket 25, is
fixod to move thorowith, and carried on its inner side a toothed wheel 26, to on nge
by its teeth the outer portion of said post, said wheel being journalled on the
bracket for an intermittent rotation as will appear. Instead of making the teeth of
said wheel with their median lines truly radial the median line of each tooth is a
tangent to a circle somewhat outside of the centre, such wheel, by this formation,
being more effective in its operation to be hereinafter explained.
A spring pawl 27, is hung on the braket 25, to ongngo the said toothed wheel,
permitting the rotation of the wheel in one direction and obstructing its reverso
rotation as will be plain on roference to Figures 1, 2 and 5, in the latter Figure the
manner of application of the spring 28, for its action on the pawl being shown.
g, h, represent the usual contact springs, which, with the contact screw i amd
wire, form tho short circuit for the magneto, and which short circuit as well known,
is ostablished under the normal relations of the parts of the call-box, and as shown
in Figure 1, at such time rendering the line circuit inoperative, but, by forcing,
through the bush button k, the spring g, away from the contact screw 7, the line
circuit is established for signalling the central office.

page_text: A swinging lever intermediately pivoted on a fixed stud, 30, supported from
the magnet or otherwise, has its one arın, 31, lying in proximity to an abutment
pin 32, on the slido shaft D, and its other arm 83, is provided with an aperture, 34
(Figure 2) through which a connecting rod m passes, said connecting rod at its end
engaging the lever arm 33, being screw threaded, receiving an adjusting and check
nut 35, the other end of said connecting rod passing loosely through an aperture, 37.
in the outer end of the contact spring g. and receiving a head at its extremity. Any
action of the push button and movement of the contact spring g as usual will have no
effect on the parts of this invention, duo to the fact that the spring g may loosely
slide over the rod, m, but should there be any undue bind between the spring and
rod whereby the rod would be moved end wise by the spring, said rod by its other
end portion could slide freely through the aperture in the lever arm 33.
The operation of this improved mechanism is as follows:
Assuming that the parts are in the positions shown in Figure 1, the receiver
holder arm being held down by the weight of tho receiver, then on pressing the
button to establish the line connection with the central office and turning the shaft A,
to generate the signalling current, the spring 15, from the rotation of said shaft,
is put under increased compression. The pawl d, by its tooth lying against the
face of the ratchet at or below the circular line of the bottom of its teeth, is by
the contrifugal force and action exerted thereon by the rotating ratchet, thrown
outwardly and moved, with its shaft, by the spring 20, into engagement with the
ratchet to prevent the ratchet from being turned in the reverse direction at an
undue time. Then on removing the receiver from its holder arm, the latter rises
under the action of its retracting spring 39, carrying the bracket 25, and toothed
wheel 26, therewith, but, as will be observed in Figure 1, a tooth of the said
wheel being in contact with the post sleeve 22, on such upward movement of the
holder arm and wheel, the wheel will be swung around the extent of one tooth, the
pawl 27, swinging outwardly against its spring to permit of such passage of the tooth
by the post.
The subscriber having finished his conservation and on hanging the receiver on the
holder arm, therefor, the holder arm is again depressed carrying its toothed wheel, 26,
therewith, and which, being held against rotation backward by its pawl and moving
by one of its teeth obliquely across the line of the post sleeve 22, the said post is
forced outward from the said toothed wheel carrying therowith the slide shaft D,
releasing the pawl d, from engagement with the magneto driving shaft A, and
permitting the same to then rotate under the recoil of its spring 15, which has boon
put under compression as aforosaid; and the movement of the slide shaft D, in a
direction away from the ratchet wheel 16, through the abutment of its stud 32, against
the arm of the lever, 4, swings such lover on its fulcrum and by the engagement of
its other end with the connecting rod, draws such rod towards the said ratchet 16,
and the contact spring g off from the screw i, establishing the line connection with
the central office annunciator.
In practice, under the rotations of the magneto shaft to call up the central office
more or less according to the habits of various subscribers, the recoil of the spring
will always effect a uniform degree of rotation of the magneto shaft for ringing off,
about one complete rotation of said shaft having boen effected under a use of the
apparatus, and such has been found to afford most practical and satisfactory results.
An advantage worthy of note under the use of the automatic ring off mechanism
lies in the fact that, by the uniformity of such ring off signals, and of a duration
fractional of the ordinary calling up signal, the avoidance of confusion to the
attendants in the central office will result.
Inasmuch as, under the increased resistance applied on the receiver holder arm, a
greater pressure is required thereon to depress same to effect the freeing of the
magneto shaft A, and the establishment of the line connection, such resistance may
be overcome by weighting the receiver, or otherwise, one contrivance therefor being
illustrated in Figure 5, in which a compound lever system is employed, the arm
corresponding to the one E, in Figures 1 and 2, by a stud 40, on its end engages a

page_text: slot 42, in another lever arm G, the latter being pivotally hung by one and on the
side of the box B, and has the receiver holding book formed on its other end, and
all as will be apparent without further description.
Dated this 4th day of Kala 1980
WM. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Telephone Call Boxes.
A communication from abroad by AMENZO GRIFFITH, of Springfield, Broker, HENRY
ANDERSON BURBANK, of Westfield, and WILLIAM HERBERT JORDAN, of Spring-
fiold, Broker, all of County of Hampden, State of Massachusetts, United States
of America.
1, WILLIAM PHILLIPS THOMPSON F.C.S. M.I.M.E. of the Agency for Foreign
Patent Solicitors 6, Lord Street, Liverpool and 6, Bank Street Manchester both in
the County of Lamaster and 323 High Holborn in the County of Middlesex Civil
Engineer do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
"
The object of the present invention is to provide means whereby n
"subscribed
wing a telephone may avoid the present spcial operation of "ringing off" as it is
termed, or in other words, when, through using the telephone temporarily estab-
lishing the proper connection with the central office annunciator and by the turning
of the magneto shaft, sending a magneto current through such connection to notify
the central office that his use of the telephone has been finished, and in more dirert
terins the purpose of the invention is to provide mechanism which may be interposod
between the telephone receiver supporting arm and the driving shaft of the magneto
which will not interfere with all the usual operation of the telephone as at present
carried out, and yet on the downward movement of the receiver arm on the hanging
of the receiver theroon will cause, or permit, through the downward movement of
said receiver arm, a second operation of the magneto to signal the central office, the
proper electrical circuit connection including the magneto and the contral office
annunciator at such time being automatically established; and the invention consists
in the construction, combination, and arrangement of various parts, all substantially
as will hereinafter fully appear and be set forth in the claims.
The present invention is shown in the drawings accompanying the provisional
specification, as applied on the telephone call-box of the well known form at present
in general and universal use throughout the country, and it will be here nhserved
that the parts constituting said call-box and signalling apparatus are in no material
manner changed, all connections and circuits being as usual, and in said drawings.
Figure 1 is a front elevation of a subseribor's call box, with the lower portion of
the front or cover broken away and some part in section, and showing the automatic
ringing off" device as applied in operative relation to the usual mechanism
embodied in said call-box, the said parts being in their positions of disuse, the receiver
hokler arm in its lowermost position, or the one it is mado to occupy when the
receiver is hung thereon and the magnato connections "short circuited."
"
Figure 2 is an clovation similar to Figure 1, at the lower part of the call-box but
showing the parts in their positions at the time the receiver holder-arm is passing
from its uppermost to its lowermost position, at which time the "ringing off" will
be automatically effected.
Figure 3, is a perspective view in detail to be heroinafter referred to, while
Figures 4 and 5, aro respectively a vertical and a horizontal section of portions
of the mechanism, taken on the lines 4-4 and 5-5 of Figures 1 and 2, and which
זו.

page_text: Figure 6, is a side elevation of the call-box illustrating a modined form of the
receiver holder or support.
The shaft A for securing through the crank handle 10 the rotation of the armature
of the magneto through means of its gear 12, meshing with a pinion 13 on the
spindle 14 of the rotary armature, at its passage through the side wall of the box B
is surrounded by a drum C; and to the shaft within said drum, one end of an involute
band or clock spring 15 is secured, a sufficient number of coils thereof being disposed
between its secured end and its outer end portion which is unsecured but bears with
a spring pressure against the inner walls of the drum.
On a turning of the shaft A to generate a magneto current to signal the central
office, for instance in the direction of the arrow, Figuro 4, from the centrifugal spring
pressure of the outer end of the coil on the wall of the drum, the said coils will not
immediately be turned in consonance with the shaft, but will be more or less wound
up and capable of an increased recoil, but after a certain extent of rotation of the
shaft the spring nay drag by its outer end around on the wall of the drum, whereby
a continued and indefinite rotation of the shaft to operate the magneto-electric
generator may be had without hindrance by or further effect on the spring, but on a
release of the force applied to rotate the crank, under the recoil of the said spring,
the shaft will be rotated in the roverse direction and a second magneto current will be
generated.
As
A sliding shaft D, is constrained to move horizontally and without rotation through
supporting lugs a b, supported from the U magnets of the generator or from other
suitable part, its one end being provided with a spring pawl, d in position for engage-
ment at the proper times with a ratchet wheel 16 which is fixed on the shaft A.
will be seen in Figure 5, the said pawl loosely encircles the slide-shaft D, and is
capable of a partial rotation thereon to an extent regulated by the fixed radial pin 18
on the shaft, and the slot 19 in the walls of the pawl through which said pin enters;
and a spiral spring 20 is applied between the lug a and the pawl to perform the double
duty of forcing the shaft outwardly towards the ratchet and also partially rotating
the pawl on its shaft so that its tooth will normally lie below the roots of the ratchet
teeth the said spring for the accomplishment of these functions is by one ond
portion made to embrace the said lug, then to encircle the shaft between the lug
and the pawl and by its other end fastened to the pawl outside of its centre of
rotation.
The lug b is bent on itself at right angles and extended horizontally in a slotted or
bifurcated bracket e, outside of the shaft D between the legs of which is a post f
fixed on and carried by said shaft, and which posts by its sides bears on the inner walls
of the bracket legs and affords means for preventing the rotation of the said sliding
shaft.
The said post is preferably bushed with a friction sleeve, 21 and is extended out-
wardly beyond the plane of the bracket e, receiving, preferably, another and separate
friction sleeve 22, of reduced diameter. One particular formation of the duplex
sleeved post is shown in Figure 5, the sleeve parts being held in place by the headed
axial pintlo 23, passing through said sleeves and the shaft. One or both of the sleeves
might be dispensed with on the post, which however, would be formed of the proper
diameter, but for obvious reasons the sleeve provision is preferred.
Upon the usual swinging receiver holder-arm E, a rigid angular bracket 25, is
fixed to move therewith and carries on its inner sido a toothed wheel 26, to engage
by its teeth the outer portion of said post f, said wheel being journalled on the
bracket for an intermittent rotation as will appear. Instead of making the teeth of
said wheel with their median lines truly radial the median line of each tooth is a
tangent to a circle somewhat outside of the centre, such wheel, by this formation,
being more effective in its operation to be hereinafter explained.
A spring pawl 27, is hung on the bracket 25 to engage the said toothed wheel,
permitting the rotation of the wheel in one direction and obstructing its reverse
rotation as will be plain on reference to Figures 1, 2 and 5, in the latter Figure, the
manner of application of the spring 28 for its action on the pawl being shown.

page_text: represent the usual contact springs, which with the contact screw i and wirej
form the short circuit for the magneto, and which short circuit as well known, is
established umier the normal relations of the parts of the call-box, and as shown in
Figure 1, at such time rendering the line circuit inoperative, but, by furcing, through
the push-button & the spring away from the contact screw i, the line circuit is
established for signalling the central offico.
A swinging lover 7 intermediately pivotted on a fixed stud 30, supportei from the
magnet or otherwise, has its one arm 31 lying in proximity to an abutment pin 32, on
the slide shaft D, and its other arm 33 is provided with an aperture 31 (Figure 2)
through which a connecting rol masses, suid connecting rod at its end angiging
the lever arm 33, being serew-threaded receiving an adjusting and check at 35, the
other end of said connecting rod passing loosely through an aperture 37, in the
outer end of the contact-pring g and receiving a head at its extremity. Any
action of the push-button and movement of the contact-spring y as usual will have
no effect on the parts of this invention due to the fact that the spring ŋ may loowly
slide over the rod m, but should there be any undue bind between the spring and
rod whereby the rol would be moved on wise by the spring, said rod by its other end
portion could slide freely through the aperture in the lover arm 33.
The operation of the improvel mechanism is as follows :—
Assuming that the parts are in the position shown in Figure 1 the receiver
holder-arm being held down by the weight of the receiver, then on pressing the
button to establish the line connection with the eatral office and turning the -haft A
to generate the signalling current, the spring 15 from the rotation of said haft is
put under increased compression. The pawld by its tooth lying against the face of
the ratchet at or below the circular line of the bottom of its teeth, is by the centri-
fugal force and action exerted thereon by the rotating ratchet, thrown outwardly and
moved with its shaft, by the spring 20, into engagement with the ratchet to prevent
the ratchet from being turned in the roverse direction at an undue time. Then on
removing the receiver from its holder-arm, the latter rises under the action of its
retracting-spring 39, carrying the bracket 25, amil toothel whe1 2, therewith, but
as will be observed in Figure 1, a tooth of the said wheel being in contact with the
post-sleeve 22, on such upward movement of the holder-arm and wheel, the wheel
will be swung around the extent of one touth, the pawl 27 swinging ontwardly
against its spring to permit of such passage of the tooth by the post.
The subscriber having finished his conversation and on hanging the receiver on
the holder-arm, therefor, the holder-arm is again depressed carrying its toothed
wheel, 26, therewith, and which, being held against rotation backward by its pawl
and moving by one of its teeth obliquely across the line of the post-sleeve 22, the
said post is forcod outward from the said toothed wheel carrying therewith the
slide-shaft, D, releasing the pawl d from engagement with the magneto driving
shaft A, and permitting the same to then rotate under the recoil of its spring, 15,
which has been put under compression as aforesaid; and the movement of the
slide-shaft, D, in a direction away from the ratchet wheel 16, through the abutment
of its stud, 32, against the arm of the lever, 1, swings such lever on its fulcrum
and by the engagement of its other end with the connecting rod, draws such rod
towards the said ratchof, 16, and the contact spring, y, off from the scrow i, ostab-
lishing the line connection with the central office annunciator.
In practice under the rotations of the magneto-shaft to call up the central office
more or less according to the habits of various subscribers, the recoil of the spring
will always effect a uniform degree of rotation of the magneto-shaft for ringing off,
about one complote rotation of said shaft having been effected under a use of the
apparatus and such has been found to afford most practical and satisfactory results.
An advantage worthy of noto under the use of the automatic ring-off mechanism
lies in the fact that, by the uniformity of such ring-off signals, and of a duration
fractional of the ordinary calling up signal, the avoidance of confusion to the
attendants in the central office will result.
Juasmuch as, under the increased resistance applied on the receiver holder-arm,

page_text: a greater pressure is required thereon to depress same to effect the freeing of the
magneto-shaft, A, and the establishment of the line connection, such resistance may
be overcome by weighting the receiver, or otherwise, one contrivance therefor being
illustrated in Figure 5, in which a compound lever system is employed, the arm
corresponding to the one, E, in Figures 1 and 2 by a stud, 40, on its ond engages
a slot, 42, in another lover arın &, the latter being pivotally hung by one end on
the side of the box B, and has the receiver holding hook formed on its other end,
and all as will be apparent without further description.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
1. In a telephone call-box, the combination with the magneto operating shaft
provided with the ratchet wheel, the enlarged wall surrounding a portion of said
shaft and the swinging receiver holder-arm, of an involuto spring by its inner end
secured to said shaft and having its outer end free for a spring bearing on said
wall, substantially as described, and a pawl normally located for engagement with
said ratchet wheel and means actuated by said holder-arm whereby on the downward
movement thereof, said pawl will be thrown out of engagement with said ratchet, for
the purpose described.
2. In combination the magneto-shaft adapted to have a spring reversed rotation,
and detent devices adapted normally to prevent such reversal, the short circuit
spring and its contact pin, the swinging receiver-holder arm and movable connections
actuated by the said holder-arm and in engagement with said arm and said short
circuit spring and also with said detent devices whereby, on the downward move-
ment of the said holder-arm said spring will be drawn from its contacting pin and
said magneto-shaft will be freed for its reverso rotation, substantially as described.
3. In a telephone call-box, the combination with the magneto operating shaft
having the ratchet-wheel thereon, the enlarged surrounding wall, and the swinging
receiver holder-arm, of an involute spring by its inner end secured to said shaft and
having its outer end free for a spring bearing on said wall, a sliding shaft having
a spring pawl thereon normally located for engagement with said ratchet and
provided with a stud, 22, and a toothed wheel and spring pawl therefor carried by
said swinging arm and located in relation to said shaft stud substantially as described,
whereby on the upward movement of the said holder-arm said toothed wheel will
produce no effect on said slide shaft, but on the downward movement thereof said
shaft will be moved longitudinally to carry said pawl out of a position for engage-
ment with said ratchet, substantially as described.
4. The combination with the magneto-shaft having the ratchet, the surrounding
circular wall and the involute spring substantially as described, and the holder-arm,
of the slide-shaft having the stud 22, and pin, 18, thereon and guiding lugs therefor,
the pawl loosely fitted on the end portion of the slide-shaft having the slot 19
engaging said slide-shaft, the spiral spring 20, applied between and secured to a
guide lug and said pawl for exerting an outward pressure on said pawl and slide-
shaft, and a pressure on said pawl for a partial rotation thereof on its shaft, and the
toothed wheel and spring pawl therefor carried by said holder-arm and arranged for
operation on and with relation to said shaft-stud, 22, substantially as and for the
purpose described.
5. The combination with the guiding lugs a and b the latter having the right
angled extension with the longitudinal slot therein, of the slide-shaft, D, for carrying
the spring pawl provided with the pin 23, and the sleeves 21 and 22, the former
bearing on the walls of said slot, substantially as and for the purposes described.
9
6. The combination with the short-circuit contact spring and the contacting
parti therefor, and the swinging receiver holder-arm, of the slide-shaft, D, having
an abutment 32, mechanism substantially as described interposed between said
holder-arm and said slide-shaft to secure a longitudinal slide of the latter on the
downward movement of the former, an intermediately pivoted tilting lever having

page_text: one end in engagement with said abutment for being swung theroby, and a connecting
rod between the other end of said lever and said contact-spring g, for drawing same
away from its contacting part on the swinging of said lover in one direction,
substantially as described.
7. The combination with the contact spring having an aperture 37, therein, and
the tilting-lever intermediately pivotad and having an aperture 34, in one arm
thereof of the connecting rod m, by ono en portion passing through the spring
aperture 37, and headed thereat, and at its other end portion passing through the
lever-armi aperture 31, and screw-threaded and the adjusting check-nul, 35, substan-
tially as and for the purposes described.
8. In a telephone call-box the magneto-shaft, A, provided with the ratchet wheel
and the enlarged circular wall surrounding a portion of said shaft, the involute
spring by its inner and secured to said shaft and by its outer end in spring bearing
on said wall, the swinging receiver holder-arm and the short-circuit contact-spring g
and its contacting button i, combined with a sliding shaft having a spring pawi
normally located for engagement with said ratchet and provided with a stud 22, and
abutment 32, a toothed wheel and spring paw! therefor carried by said swinging arm
and located in relation to said shaft for the operation on said slide-shaft, as described,
an interine liately pivoted tilting-lever 1, by one arm in pusition to be engaged by
said slide-rod abutment, 32, and a connecting rod, m, between and in engagement
with the other arm of said lever and said contact-spring, g, all substantially as and
for the purpose described.
9. In a telephone call-box, the combination with the swinging lover, E, of the
lever, (i, separately pivoted by its one end on the box and engaging said lever
by an intermediate portion thereof which is nearer said pivotal point than its outer
end, substantially as and for the purpose described.
Dated this 23rd day of September 1889.
WM. P. THOMPSON & 10.,
Agents for the Applicant.