1. No category

Oct. 14, 1952
w. T. WEIDENMA’N
ELECTRICAL IMPULSE TRANSMITTER
'
2,613,552 '
Filed July 28, 1950
9
INVENTOR
WILLIAM T WEIDENMAN
Patented Oct. 14, 1952
2,613,552
".“(UNITED STATES PATENT OFFICE
ELECTRICAL IMPULSE TRANSMITTER
William T. Weidenman, Spring Valley, N. Y., as
signor to Telephonics Corporation, Huntington,
N. Y., a corporation of New York
Application July '28, 1950, Serial No. 176,327
12 Claims. (cite-57s)
1
2
Thisv invention relates to electrical impulse
transmitters, and has particular reference to
calling dials for automatic telephone systems or
other. apparatus controllable remotely by selec
tive electrical impulses.
v
'
is" anchored on the pawl plate near the hook of
the pawl and the'free end of'the spring‘extends
past‘ the ‘pawl hook and seats in the'r'atch'et
groove between its anchor and the pivot of ‘the
pawl so' as ‘to intervene-between the pawl and
the‘ ratchet teethat the point of usual impact
Telephone'calling dials are well known and
and'thus deaden the same.
'
'
their‘ construction and operation has become sub
It will be seen that the invention provides a
stantially standardized. An incident to their
verysimple and inexpensive means for correcting
operation is'thefamiliar clicking noise caused
by’lthe'dropping of the ?nger wheel pawl to the 10 the principal objection to impulse transmitters of
the calling dial type, and that the invention may
bottom of‘ the teeth of the ‘ratchet before the
be applied to'existing designs of dials‘ without
return spring rotates the ratchet wheel through
impairing their e?iciency or introducing an ele
the angle equal to the number of teeth’ corre
ment of future 'dif?culty.
sponding to the digit dialed, causing the contacts
‘For a more complete understanding of the in
to‘ close an'equal number of times to send that
vention, reference may be had to the accompany;
number of electrical impulses. Although this
ing drawings, in which:
‘
'
clicking is'not loud, it is distracting and often
‘Figure 1 illustrates a front view of a telephone
disturbing, especially where the dial is in almost
type calling dial embodying the invention, a por'—
continual operation as by a telephone operator.
Many expedients have been employed to elimii 20 tionpf certain of the parts being cut away in
the'int‘erest' of clarity;
'
'
'
nate or. at least deaden the click, but they have
’ Fig. 2 is an enlarged view of the pawl mecha
either been ineffective or have impaired the
nism of the calling dial illustrated in Fig. 1;
'
e?iciency of operation of the dial in time.
Fig. 3 is an enlarged transverse section through
‘In accordance with the present invention, a
simple and inexpensive means is provided for 25 the pawl and ratchet mechanism, as seen along
virtually eliminating the clicking noise incident
to the operation of the ratchet and pawl mecha
nism of a calling dial type of impulse sender,
the line'3-'-—3 'of Fig. 2; and
‘
:Fig. 4 illustrates a modi?ed form of the inven
tion';
‘
‘Referring to Fig. 1, numeral 5 designates the
without impairing the ef?ciency of the dial even
after extended use, and without requiring atten
tion or replacement of parts other than that
normally required in any event.
The. invention comprises an electric‘ impulse
transmitter‘having the usual ratchet wheel and
pivoted pawl, which is rotated by the ?nger 35
?nger wheel dial arranged with its ?nger holes
above the number plate 6, and having a central
opening keyed to ‘a raised hub portion 8 of the
wheel'oridial in a rearward direction until re
leased‘so that the pawl engages a tooth to rotate
?nger wheel 5 results in the movement of plate
plate 9 and‘ to which it is held by means of a
screw threaded in the hole in the center of hub
8.
Hence, clockwise manual rotation of the ‘
9 up to the point where the ?nger engages stop
the 1 ratchet wheel, the ratchet wheel being
1, whereupon the wheel 5 is released and is ro
grooved peripherally to at least the root circle of
tated counterclockwise by a tension spring at
the'vt'ee’th, and a wire spring having. one end 40 tached to shaft 15 at a speed‘ controlled by the
anchored on ‘the pawl plate and the free end
usual governor, not shown. This return move
sliding in said vgroove intervenes between the
ment of dial ,5 and plate 9 is limited by the en
pawl‘a'nd' the teeth'so as to deaden the impact
gagement of a projection on plate 9 with the
thereof‘.
'
stop I3.
‘In‘t‘the' preferred embodiment of the invention, 45
Pawl I0 is pivoted at H to the plate 9 and is
thewwire‘spring has one end anchored in the
normally urged against and between the teeth
pivot pin of the pawl to serve as the means for
I? of ratchet wheel M by the coiled tension
holding the pawl on the pin, and the other end
spring l2. As the ?nger wheel 5 is rotated in
extending in the direction of the pawl and track
the clockwise direction, carrying the plate 9 and
ing in the ratchet wheel groove, the curvature of 50 pawl 10 with'it, the ratchet'wheel M remains
the spring being such that it arches slightly
above the root circle of the pawl teeth so as to
stationary and the pawl l0 snaps over the ends
and'between the ratchet wheel teeth ll. Upon
the return movement of the ?nger wheel 5 the
intervene between the pawl and back face of the
tooth and thus deaden the impact of the pawl.
pawlengages one of the teeth 11, thereby carry
In a modi?cation of the invention, the spring 55 ing the ratchet wheel l4 along with it and also
2,613,552
3
rotating the gear I6 formed integrally with the
ratchet wheel and adapted to operate the im
pulsing mechanism, not shown. The mecha
nism just described is conventional and Well
known.
Ordinarily, as the pawl I8 drops down into the
notches between the teeth I‘! on the ratchet I4,
the familiar clicking noise ensues, owing to the
4
the impact of the pawl ID, of which the spring
I8 is otherwise independent and with which it
is unconnected.
A modified form of the invention is illustrated
in Fig. 4, which is a view similar to Fig. 2 and
shows the cushioning spring I 8', anchored on
pin 24 secured to pawl plate 9. However, spring
I8’ extends in the opposite ‘direction from the
metal-to-metal contact.
In order to deaden and
spring I8 of Fig. 2, in that the spring I8’ ex
thus substantially eliminate this clicking noise, 10 tends past the pawl hook and seats in the ratchet
a wire cushioning spring is provided between the
pawl and the ratchet teeth. This cushioning
wheel groove 23 at a point between anchor pin
24 and the pivot II of the pawl, so that when
spring is designated I8 and is formed of'spring
steel wire, Phosphor bronze. wire, beryllium
the pawl plate 9 is rotated in the direction of
bronze wire, or other suitable resilient material
capable of withstanding countless operations of
the dial without losing its resiliency or breaking.
One end of the cushioning spring I8 is an
chored on stationary pin II mounted on pawl
plate 9 and on Which the pawl I0 is pivoted as
described.
Conveniently-the heel of thepawl
I II is bifurcated by a saw-cut slot I9 and the
pin II. is drilled radially of the dial at a point
within pawl slot I9,‘so that the reversely turned
end 28 of spring-I8 may be inserted into the
hole in the pin I I by wayof the access a?orded
by the pawl slot I9. The spring I8 thus serves
the. secondary purpose of holding the pawl I0
onthe" pin I I without requiring other holding
means, and alsoholds itself on thepin II by
reason ‘of its springiness, which requires that the
loop of the spring be bent to admit the pin II
between its end 28 and the main portion of the
spring I8, and consequentlythe end 28 snaps
into the holein the-pin‘ II ‘when aligned there
with.
The free end of the spring. is turned upwardly
and acts as ashoe tracking in ‘a peripheral
groove23‘ out radially through the ratchet wheel
I4 to‘a depth slightly below the 'root’circle :of
the arrow in Fig. 4, the shoe end 2 I ' of the spring
I8’ is dragged in the groove 23 instead of be
ing pushed along therein ahead of the pawl
II] as in the case of Fig. 2.
In operation of the modi?ed form of Fig. 4,
the arch or bight 22' of cushioning spring I8’
intervenes between the pawl I8 and the face of
the corresponding ratchet tooth I'Ito- cushion
the-pawl impact and to‘ deaden the sound‘in
the‘ same manner described in connection with
Fig. 2. In fact, an axialsection through Fig-‘:4
similar to that taken along line '3-—3 of Fig. 12
would be identical to Fig. 3.
-
“Although certain preferred embodiments'of
the invention have been illustrated and ade
scribed herein, it is to be-understood that the
invention is not limited thereby, but is susceptible
of changes in form and detail within‘ the‘ scope
of the appended-claims.
I claim:
‘
l.v In an electrical impulse‘ transmitter having
a- ratchet wheel provided with teeth'around- its
periphery, a, pivoted pawl adapted'to engage-the
toothed periphery of said ratchet wheel, and
means for rotating said pawl-rearwardly over
said ratchet wheel teeth and then to engage ‘a
tooth thereof tomove'thei'atchet wheel with
the pawl, the combination of a member‘carried
the teeth I ‘I, as shown in Figs. 2~and 3. The
spring I8 is arched outwardly in a radial di
by said. pawl rotating means-and‘ moving there
rection, so that its arch or bight 22 normally
with, and cushioning means'mountedon said
lies -just above the faces of the ratchet teeth
member ‘and interposed between‘ saidpawl {and
I‘I,"as shown in Fig. 2.‘
45 the bottoms ‘of the notches of said"ratchet~wheel
In operation of the dial of this invention, the
in radially overlapping relation‘ to the-amateur
pawl plate '9 rotates with the ?nger wheel 5 and
faces of the ratchet wheel teeth and the notches
carries the pawl I8 so that when the dial is
between them, whereby said cushioning means
turned in the direction of the arrow, the pawl
intervenes‘between' the pawl and‘ the'bottom of
I0 drags over the ends of the teeth I‘! to nor
a corresponding notch of the ratchet wheel upon
mally strike against the faces thereof and make
impact by the pawl' to thereby 'deaden the im
the objectionable clicking noise. However, the
pact sound.
arch or bight'22 of the spring I8 intervenes and
2. In- an electrical impulse‘ transmitter having
precludes the pawl ID from striking the face
a'ratchet Wheel provided with‘ teeth'around'its
of the corresponding ratchet tooth I‘! and thus 55 periphery,'a pivoted pawl' adapted to'engage: the
dea'dens the sound, so that the dial equipped
toothed ‘periphery of said 'ratchet‘wheelpand
with the cushioningspring- I8 is virtually noise
means for rotating said pawl rearwardly over
less.
said ratchet’ wheel teeth‘ and then to' engagexa
The resiliency of the spring I8 causes it to
tooth thereof to ‘move the ‘ratchet wheel‘with
recoil somewhat upon impact of the pawl I0 60 the pawl, the combination of a resilient mem
therewith, but not enough to allow the pawl ID
ber interposed between said teeth and said‘ pawl
to strike the face of the ratchet tooth II. It
and continuously engaging said means and wheel
will be'observed that the spring I8, being an
in radially overlapping relation to the axial sur
chored at one end on pin II, rotates with the
faces of the ratchet wheel teeth and the notches
pawl plate S-relatively to the ratchet wheel I4 65 between them, and means anchoring said mem
when dialing in the direction of the arrow, so that
ber to said means, whereby the member is moved
the shoe 2| of the-spring I 8 is pushed ahead
with saidpawl relatively to said wheel‘during
of the pawl III in the groove 23 of the ratchet
operation and intervenes between the pawl and
wheel without any deteriorating torsion by the
the bottom of a notch of the ratchet wheel upon
pawl- I 0 since it is anchored independently of
impact by the pawl to thereby‘ deaden the im
the pawl on stationary pin II. Accordingly,
pact sound.
the-spring I8 is relatively stationary with re
‘3.-In an electrical impulse transmitter having
spect to the movements of the pawl I0 except
a ratchet wheel provided with teeth around its
for the slight relative creeping of the shoe 2|
periphery, a pivoted pawl adapted toiengagelthe
as the spring I8 slightly ?exes in response to
toothed periphery of said ratchet wheel, "and
2,613,552
5
means for rotating said pawl rearwardly over
said ratchet wheel teeth and then to engage a
tooth thereof to move the ratchetwheel with
the pawl, the combination, of a spring wire mem
ber interposed between said teeth ‘and said pawl
6
thereof to at least the bottoms of'the notches'be
tween said teeth, and a resilient member carried
byv said means and sliding in said groove and hav
ing a portion intervening between said pawl and
said teeth for receiving the impact of said pawl
and continuously engaging said means andv wheel
inradially overlapping relation to the axial sur
faces of the ratchet wheel teeth and the notches
and thereby deaden the impact sound.
impact by the pawl to thereby deaden the im
pact sound.
pawl, said ratchet wheel having a peripheral
groove extending radially inwardly through the
'
8. In an electrical impulse transmitter having
a ratchet ‘wheel provided with teeth around its
between them, and means anchoring said ,mem
periphery, a pivoted pawl adapted to engage the
vb'er ‘to said means, whereby the member ismoved 10 toothed periphery of“ said ratchet wheel, and
with said pawllrelativelyto said ,wheel during
means for rotating said pawl rearwardlyfover
operation and intervenes between the pawl and
said ratchet wheel teeth and then to engage a
the bottom of a notch of the ratchet wheel upon
tooth thereof to move'the ratchet wheel with the
4. In an electrical impulse transmitter having
~a~ratchet wheel provided with teeth around its
‘periphery, a pivoted pawl adapted to engage the
toothed periphery of said ratchet wheel, and
:nieans for rotating said pawl rearwardly over said 20
teeth thereof to at least the bottoms of the
notches between said teeth,‘and a spring wire
member carried by said means and sliding in said
groove and having a portion intervening between
ratchet wheel teeth and then to engage a tooth
-: thereof to move the ratchet wheel with the pawl,
the combination of a resilient member having an
sound.
wa‘r'chedportion interposed between said teeth and
{said pawl and continuously engaging said means
and wheel in radially overlapping relation to the
haxial surfaces of the ratchet wheel teeth and the
wnotches between them, and means anchoring said
said pawl and said teeth for receiving the impact
of said pawl and thereby deaden the impact
9. In an electrical impulse transmitter having
a ratchet wheel provided with teeth around its
periphery, a pivoted pawl adapted to engage the
toothed periphery of said ratchet wheel, and
means for rotating said pawl rearwardly over said
ratchet wheel teeth and then to engage a tooth
~. member to said means, whereby the member is
thereof to move the ratchet wheel with the pawl,
:moved with said pawl relatively to said wheel dur 30 said ratchet wheel having a peripheral groove
ving operation and intervenes between the pawl
extending radially inwardly through the teeth
and the botton of a notch of the ratchet wheel
thereof to at least the bottoms of the notches be
upon impact by the pawl to thereby deaden the
tween said teeth, and a, resilient member carried
‘impact sound.
8
by said means at one end and sliding in said
v 5. In an electrical impulse transmitter having 35 groove at its other end and having a portion in
:a'ratchet wheel provided with teeth around its
tervening between said pawl and said teeth for
'1' periphery, a pivoted pawl adapted to engage the
receiving the impact of said pawl and thereby
-» toothed periphery of said ratchet wheel, and
deaden the impact sound.
; means for rotating said pawl rearwardly over said
10. In an electrical impulse transmitter having
s-ratchet wheel teeth and then to engage a tooth
a ratchet wheel provided with teeth around its
~ thereof to move the ratchet wheel with the pawl,
periphery, a pivoted pawl adapted to engage the
q-the combination of an elongated resilient mem
toothed periphery of said ratchet wheel, and
; .ber carried by said means at one end for move
means for rotating said pawl rearwardly over said
ment therewith, said ratchet wheel having a
ratchet wheel teeth and then to engage a, tooth
‘' peripheral groove extending radially inwardly 45 thereof to move the ratchet wheel with the pawl,
.~ through the teeth thereof to at least the bottoms
said ratchet wheel having a peripheral groove
of the notches between said teeth and relieving
extending radially inwardly through the teeth
_ ' the other end of said member, whereby the mem
thereof to at least the bottoms of the notches be
;"bar is interposed between the pawl and said teeth
tween said teeth, and a spring wire member car
to thereby deaden the impact sound.
, 50 ried by said means at one end and sliding in said
6. In an electrical impulse transmitter having
groove at its other end and having a portion in
111a ratchet wheel provided with teeth around its
tervening between said pawl and said teeth for re
‘- periphery, a pivoted pawl adapted to engage the
ceiving the impact of said pawl and thereby
deaden the impact sound.
toothed periphery of said ratchet wheel, and
“means for rotating said pawl rearwardly over
11. In an electrical impulse transmitter having
‘ said ratchet wheel teeth and then to engage a
a ratchet wheel provided with teeth around its
periphery, a pivoted pawl adapted to engage the
vf. tooth thereof to move the ratchet wheel with the
“pawl, the combination of a spring wire member
toothed periphery of said ratchet wheel, and
‘carried by said means a one end for movement
means for rotating said pawl rearwardly over said
therewith, said ratchet wheel having a peripheral
ratchet wheel teeth and then to engage a tooth
groove extending radially inwardly through the
thereof to move the ratchet wheel with the pawl,
Q‘ teeth thereof to at least the bottoms of the
the combination of a pivot for said pawl mount
, notches between said teeth and relieving the other
ed on said means, said ratchet wheel having a
end of said member, whereby the member is inter
peripheral groove extending radially inwardly
. posed between the pawl and said teeth to thereby
through the teeth thereof to at least the bottoms
of the notches between said teeth, and an elon
deaden the impact sound.
7. In an electrical impulse transmitter having
‘.a ratchet wheel provided with teeth around its
periphery, a pivoted pawl adapted to engage the
‘toothed periphery of said ratchet wheel, and
' means for rotating said pawl rearwardly over said
'fratchet wheel teeth and then to engage a tooth
“thereof to move the ratchet wheel with the pawl,
~said ratchet wheel having a peripheral groove ex
tending radially inwardly through the teeth
gated resilient member anchored a one end on
said pawl pivot and sliding in said groove at its
other end and interposed between said pawl and
said teeth so as to receive the impact of said pawl
and thereby deaden the impact sound.
12. In an electrical impulse transmitter having
a ratchet wheel provided with teeth around its
periphery, a pivoted pawl adapted to engage the
toothed periphery of said ratchet wheel, and
2,613,552
8
7
REFERENCES CITED
means forrotating said pawl» rearwardly over said
ratchet ‘Wheel teeth' and then to engage a tooth
_ The ' following‘ references ‘ are of record in lthe
thereof to‘ move the ratchet wheel with the pawl,
?ie‘of't'his‘patent:
‘
~ '
the combination of an elongated wire'spring hav
'VUNITEDISTIATES
PATENTS
ing an arched center portion; means anchoring 5
Name
.
Date
Number
one end of said ‘spring to the said'pawl rotating
Grosclaude _;-_;___; Nov. '26, ‘1878
means with its other end extending substantially
~ 7' 210,251
parallel to said'pawl and'engaging said wheel,
1;367‘,l45
whereby the arched center portion of said spring
--2,-217,07.4
intervenes between said pawl and said teeth to 10 ‘2,389,695
receive the impact of said pawl ' and thereby
‘FOREIGN PATENTS”
deaden the impact sound.
vWILLIAM T. WEIDENMAN.
Josleyn ___________ __-_'Feb. 1,-1921
>Obergfe11 ______ __'____ Oct. 8, 1940
Stenhammer _____'__-_ -Nov.'27,-194'5
Numberv -
89,498
Country
_ 7
Date‘
Germany _____..‘_..____. ‘Man/8,‘ 16,916