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Патент USA US2408043

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Sept° 24, 1946„
Filed June 18, 1943
5577/ E. Banff
Ä T701? EY
` Patented Sept. 24,1946
‘ `2,408,042
' .
Seth E; Butler, Union City, N. J., assig’nor to
Federal Telephone and Radio Corporation,
Newark, N. J., a. corporation of Delaware
Application June 18, 1943, Serial No. 491,406
' `My invention relates to dials for controlling
electrical or other apparatus, and more specifi
cally to an improved form of dial assembly which
'permits the dial to be locked in position without
disturbing the selected setting.
The invention has as one object, therefore,
the provision of a dial structure having a lock
ing means which is designed to eliminate the
possibility of “creeping” or undesirable move
ment, being introduced into the control appara
is positioned adjacent and parallel to the panel
I4, as shown in Fig. 2. An annular- groove 20
is cut into the surface of hub Il), and a pin 22,
which is receivable by an opening 23 in hub ` Iû
and shaft I2,` projects into this groove. This >pin
thus also secures hub I ll to shaft I2 so that they
rotate together.
a dial for panel mounting which includes a con
trol means and a locking mechanism formed as
A recess I9 (Fig. 4) in the rear portion. of dial
body 6 receives a ring-‘shaped flexible spring ele
ment 30 which is made of material such als phos
phor bronze, and which has an opening corre
sponding in size and shape to the opening 'I.j This
spring element 30 is securely attached to the dial
body 6 by means such as two drive screws 36
a compact unit.
which have their heads recessed so as not to pro
tus as a result of the locking action.
Another object of the invention is to provide
A further object of the invention is to provide
a dial assembly including adjusting means and
locking means, each of whch has a slotted control
face so as to permit operation thereof by any
tool having a relatively thin edge.
ject above the surface of the spring element. An
other recess 28 in the lower portion of dial body 6
forms an extension of recess I9 as shown in Figs.
2, 3 and 4, A tabrportion 30A forms an. exten
' A still further object of the invention is `to
sion o-f spring element 3U, and is adapted to be
positioned Áwithin the recess 28 as ‘best shown in
provide a locking dial assembly for panel mount
Fig. `2.
,ing which utilizes the panel itself as the rear en
Two threaded’openings 34 in dial body 6 re
closure for the assembly, thus dispensing with a
ceiYe two threaded stop pins 32 which when in
separate back cover for the dial.
25 place project radially within the opening -I as
Other objects and >advantages will be apparent
shown in Fig. 4._ These pins 3'2 lie in the plane of
from the following description of a preferred em
rotation of the pin 22 and contact the latter to
bodiment of the invention and from the draw
limit the extent of rotary movement of the hub
ing, in which:
IB. Since these 'stop pins extend into the groove
Fig. 1 is a front view of a preferred form of 30 20, they perform the further function of prevent
dial assembly in accordance with the present in
ing the hub and shaft from becoming dissociated
from the` dial body whenever the assembly >is sep
Fig. 2 is a transverse cross-sectional view taken
arated from the panel I4.
along the line 2-2 of Fig. 1; .
Froml Fig. 2 it can be seen that the panel I4,
Fig. 3 is a View of the dial assembly similar to '
the flange I8 of hub IIJ, and the spring element
Fig. 2 with the panel, the shaft, and the hub
3U are disposed in substantially parallel relation
assembly removed;
Fig. 4 is a back view of the dial assembly shown
ship, the rotatable llange I8 being positioned be
tween the stationary-panel I4 and the stationary
in Fig. 3;
spring element 30. To maintain a tension on the
Fig. 5 is a front view of a modification of the 40 flange I8 so that the shaft I2 will not be subject
dial assembly of Fig. 1, showing a Vernier attach
to slipping, the lower portion of flexible spring
element 30 is bent slightly toward the panel,` as
In Figs. 1 and 2 is shown a substantially cylin
shown in Fig. 3.
drical dial body E having a scale on the face
A second opening 8 is formed in the lower por
thereof, this scale being calibrated according to 45 tion of dial body 6 as best shown in Fig. 2. This
_the characteristics of the apparatus with which
opening 8 has a threaded extending portion 25
the dial is to be associated‘such as, for exam-ple,
`which is designed to receive a screw 24; The
a radio tuning condenser. A central opening 'I
opening 8 has suñicient depth to allow for several
(Fig. 3) is formed within the dial body 6. In this
turns of the screw head 9. The end of screw 24
opening 'I is rotatably positioned a hub I3 mount- '
ed on a shaft I2, as Vshown in Fig. 2. A slot II
is out into the face of hub Il] to permit rotation
>of the hub by any tool which can be inserted in '
the slot, such as a screwdriver.
The dial body 6 is mounted on a panel I4 by »
meanssuch as screws I5 receivable in threaded
openings I'I in the dial body (see Fig. 4). An
opening I5 in panel I4 coaxial with the opening
1 permits passage therethrough of the shaft I2.
’I‘he hub I0 is provided with a flange I8 which 60
is peened over as shown at 2l to make the screw
captive in the opening 25.
The center of tab portion 311A is axially dis
posed with respect to the screw 24. Thus when
the head 9 is selectively turned, the peened-over
end 2‘I of the screw 24 will contact this tab. Fur
ther tuning of the head 9 will force the tab against
the ilange I8, compressing the flange between
Athe tab and the panel I4 and preventing rota
tion of the flange. It will be seen that this force
is parallel to the shaft I 2, so that no rotary pres
. 2,408,042
sure can possibly be applied to the shaft as a re
sult of this locking action. ,
said hub is provided with an annular groove on
with respect ‘to said body.
the surface thereof, in combination with a pin
While the stops 32 have been illustrated in a
in said hub securing the. latter tothe shaft and
extending radially into said groove, and one or
position which permits a 180° rotation of the hub
more stop pins in said body extending radially
l0, it will be clear that they may be located at
other points to allow for any desired angle of.,> @into said groove, said stop pins positioned to beV
rotation. In fact they may be omitted entirelyd ì _, _contacted by said ñrst mentioned pin upon selec-V
tive rotation of said hub to thereby limit the
if desired, in which case the pin 22 as Well as-y
the groove 29 in the hub lllA will' no longer be«
rotary movement o_f said hub in each direction
IntFig. 5 is shown a modification of' the >dial»
_ 3. Incombination with a panel having an open
assembly of Fig. 1. Replacing `the smooth-.edged
ing therein,` a shaft passing through said opening
flange I8 of Fig. 2 is a toothed flange IBA. A gear ' and having a flange adjacent said panel, a hous
38 engages this toothed flange. A knob-3:? pro
ing secured to said panel and enclosingY said ‘
vided for rotating the gear 38. To allow for posi 15 flange, a resilient member secured to> said housing
ofthe toothed flange I8A isfsimilarin all respects
and Vadjacent said` flange, compressingmeans car
ried by said housing, and means responsiveto
operation of said-compressing meansf forfcom.
to that of _the Yflange il! insofar as the locking
pressing said flange-betweensaid panelandsaid
tioning ' of these additional elements, the dial
body is` extended asshown at 5A. The function
actionìis concerned,¿the` teeth being merely added
resilient member to thereby prevent Vrotation of
tothe periphery of the smooth-edged flange V|78
illustrated in Fig. 2. By rotation ofthe, knobß'l
it :is Iclear that a very.V precise adjustment ofthe
4.. The combination of claim 3, further com
prising a calibrated` scale von the face of said
housing,-a hub on saidshaiît, said hub having a
' shaft A|12 maybe obtained.
Other modifications coming within the scope
pointer thereon, associated with said scale, anda
of Athe present inventionwill occur to those
skilled in the art. For example„instead of using
slot on said hub for permitting actuation thereof
to thereby cause said. pointer to be moved .rela
a >slotted flat turning hub, this hub` could be in
the form of a projecting, knob or other form of
tive to said scale.
5. A dial assembly comprising a. substantially
rotatable control member.
cylindrical dial body having a scale .on theface
The dial assembly herein Vdisclosed thus> pre
thereof and a relatively large` cylindrically-'shaped
sents/many features. In addition to those set
central opening, asubstantially `cylindrical -hub
forth, mention might be made. of the relatively
rotatably positionedin said opening», a pointer
large size of the control dial in relation to the
on said hub for association withsaid =scale,.means
overall size of they assembly, thusfacilitating ad 35 for permitting actuationof -said. hub, afpanel havl
justmentr thereof. Moreover it. isinecessar'y to
ing an Aopening therein, screwV «means securing
provide,` in addition to the screw holes, but a
said-body to said panelaso-that the opening, inzsaid
single small opening in the panel to accommo
body is coaxial with the opening‘insaid panel, a Y
date the control shaft. Also, since this. panel
shaft secured to saidl hub and passing through
itself forms thenrear cover for the assembly, no
the opening in said> panelpa flange' on: said hub',
separate back enclosure Vis needed. Furthermore
within said body, and having one face thereof
the stop pin members not only limit the extent
adjacent said panel, a ring--shapedl washer `of re
of rotary movement of the hub, but also prevent
silient material adjacent‘the opposite face of said
the hub and shaft mechanism from. being unde
flange from said panel, said body Vhaving la
sirably separated from the dial body while the
threaded second opening parallel Vto- 'said' first
apparatus is` being assembled,
mentioned opening, a screwA receivable Vin said
' While I `have described above the principles of
my invention in connection with specific appa,
threaded opening, a tab portion forming an ex
tension of said ring-shaped washer and >posi
tioned axially of saidsc-rew, whereby selective
movement of said screw'wi'll cause the yend thereof
ratus, and particular modifications thereof, it
is. to be clearly understood that this description
is made only by way of example and not as a
to contact the tab portion of said ringfshaped
washer, thereby causing said washer‘to be 'forced
against said flange to compress said flange ,be
' limitation on the scope of my invention as set
forth in the objects of my invention and the
accompanying claims.
I claim.:
b1 Cul. tween said. washer and` said panel.
l. Ina dial assembly designed for panel mount- ‘
' ing,` ay dialf body having a cylindrical- aperture
therethrough, means securing said. body- to said
panel, a hub rotatably positioned in said aper
ture, a shaft secured to said hub and passing
through an opening in said panel, a flange form
ing an extension of said hub, said flange being
enclosed within said body and adjoining said
panel, .a flexible washer secured to the interior
of said'bocly and adjoining .said flange on the
opposite side thereof from. said panel, saidbody
having athreaded second opening in` alignment
with av portion of said washer, and a screw re
ceivable in said threaded opening, said screw
being designed upon rotation thereof to contact 70
said, washer and thereby con-ipressv said flange
between said washer and said panel.
2. A dial assembly according to claim 1 in which
6. A dial assembly according to claim 5, in
which said cylindrical hub'is formed with an
annular» groove on its surface, in combination
with a pin in saidhub and extendingradially into
said groove, a pair of threaded-stop openingsI in
said body extending radially thereof, said stop
openings being in the plane of said-groove, a pair
of threaded stop pins respectively receivable by
said kstop openings, said stop pins when in place
extending at A least partially Y into said groove,
whereby rotation of said hub will cause said'flrst
mentioned pin to selectively contact said .stop pins
to thereby limittheextent of rotation of said hub,
and whereby movement. ofsaid'l hub lengthwise 'of
said shaft will cause said stop.~ pins to contact a
side of said. groove.
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