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Патент USA US2405181

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‘ Aug. 6, 1946.
2,405,181
s. A. BOKOVOY ETAL
I, FREQUENCY DETERMININING UNIT
Filed Aug. 39,‘ 1944
v
INVENTORS
SJMz/FA ,4. 60mm)’
BY
‘
M4445‘ STU/V72
2,405,181
Patented Aug. 6, 1946
UNITED STATES PATENT OFFICE
2,405,181
FREQUEN CY DETERIWIINING UNIT
Samuel Alexander Bokovoy, Verona, and Hans
Stuntz, Nutley, N. J ., assignors to Federal Tele
phone and Radio Corporation, New York, N. Y.,
a corporation of Delaware
Application August 30, 1944, Serial No. 551,984
7 Claims.
(Cl. 171—-327)
2
with the interposition of a resilient sealing washer
3, a cover member 4, likewise of molded insulating
material. As indicated the cover is secured by
consists of an improved and simpli?ed structural
means of securing screws 5, countersunk and
arrangement specially designed to reduce the
passed
through apertures 6 in the cover and se
number of parts to a minimum. As a result there Ci
cured to threaded apertures l in the housingbody
is substantial economy in costs and labor in pro
portion. The socket 2 formed in the body member
duction, including reduced tooling, stocking of
I is of rectangular cross sectional contour hav
parts and fewer operations in assembling. It
ing its side and end walls parallel to the similarly
further o?ers material advantages over construc
tions as heretofore employed particularly with 10 contoured external surface of the body portion
and has its bottom wall formed with symmetri
respect to the total elimination of welding or
cally disposed transversely extending bosses 8 to
soldering required in the making of a holder unit
provide for a limited area supporting contact with
having rigidly secured terminals and contact
the insert elements.
members. Thereby there is avoided all danger
rFhis invention relates to oscillator or resonator
units for crystal controlled oscillator circuits. It
of detrimental e?ect incident to loose solder or
The dimensions of the socket as will be appre
ciated are such as to receive the usual insert ele
flux acid in?uence on the contacts and contained
ments composed of the crystal 9 and cooperat
parts. The improved features and structure are
ing, oppositely positioned, electrodes It which are
such as to be particularly well adapted for incor
of rectangular plate formation and of a relative
poration in the end or top loading, plug-in ter
size to be received by the socket in a manner to
minal types of resonator units wherein a maxi
insure of positioning in proper cooperative rela
mum of compactness is desirable. Its features
tion for attaining the desired resonant action.
are further specially adapted for units of the type
The width of the socket is likewise such as to
having generally rectangular sockets for the in
permit of the reception of the coil spring I I hav
sert elements and wherein provision is made for
electrical contact at diagonally opposite corners 25 ing the turns thereof at its opposite extremities
enlarged to be of a, diameter substantially cor
of the socket, an arrangement suitable to many
responding to the longitudinal dimension of the
desirable types of crystal mounting. '
socket portion with the required tolerance for
The described and other features and advan
its reception. The action of the coil spring in its
tages of the present invention will be more fully
understood by reference to the accompanying 30 interposed position as shown is to exert on or
drawing wherein like reference characters are
applied to the corresponding parts in the several
views.
_
In the drawing:
Fig. 1 is a view in side elevation of the im
proved oscillator unit;
Fig. 2 is a plan view thereof with the cover
removed;
Fig. 3 is a central, longitudinal vertical section
of the housing, crystal and contact assembly
forming the resonator unit;
Fig. 4 is a cross sectional view at right angles
thereto;
transmit to the electrodes and crystal a com
pressive force proportioned to maintain good
electrical contact therebetween and likewise to
maintain a similar compressive engagement with
35 cooperating contact elements in an improved
arrangement as now to be described.
The improved contact arrangement in accord
ance with the present invention provides for a
greatly simpli?ed and advantageous structure
wherein the usual plug-in type of terminal pins
and the contacts or contact plates associated with
the respective pins are integrally formed for rigid
assembling with the housing by uniting therewith
Fig. 5 is a longitudinal sectional view of the 45 in the molding operation. As a result the pro
duction is simpli?ed to a material degree, accurate
cover member, and
alignment is readily obtained and also rigidly
Fig. 6 is a perspective view of the improved
retained in the assembly. In addition objec
combined terminal pin and contact.
tionable factors, as presented by welded and
In the preferred embodiment of the invention
soldered assemblies of pins and contacts as here
as herein disclosed the housing or holder for the
tofore employed, are eliminated. These include,
crystal element and the contacts and mounting
in addition to di?iculties introduced by variations
parts is formed of molded insulating material con
of proper alignment in the assembling of support
sisting of an inclosing body or base portion 1
ing parts where close tolerances are required,
formed with a top opening, rectangular socket
danger of electrical disturbance incident to loose
2 for the insert parts and to which is attached, 55 solder or improper welding and possibility of dot
3
2,405,181
4
rimental or corrosive acid in?uence as a result
onator element, said housing being of molded in
sulating material and having integral, combined
terminal pin and contact plate elements molded
therein and having their contact portions extend
of the use of soldering ?uxes.
As best shown in Figs. 3, 4 and 6, in the im
proved contact arrangement of the present in
vention the terminal pins l2, having the usual
ing within the socket, a crystal element and op
posite electrodes associated therewith received
within the socket with one electrode engaging
rounded extremities for plug-in electrical con
nection, are formed at their inner portions with
deformations or bonding ribs I 3 for mechanical
bonding with the molded housing and have in
one of the contact plates and a spring interposed
to engage the opposite of said electrodes and the
tegrally formed therewith the inwardly or up ]. O other of said contact plates for closing of the
electrical circuit.
wardly extended contact plates Id. The contact
2. A frequency determining unit of the char
extension is desirably of ?attened or plate forma
tion, extending parallel to the axis of the pin,
acter described comprising a housing member
provided with a rectangular socket for the recep
tion of a resonator element, said housing being of
molded insulating material and having integral,
combined terminal pin and contact plate ele
ments molded therein and having their contact
and has its upper extremity beveled or tapered at
its inner side. As assembled by molding with
the housing the contact plate extensions of the
respective pins are oppositely positioned and par
tially embedded in the side walls of the housing
portions vertically extending within diagonally
opposite corner positions of the socket, a crystal
element and opposite electrodes associated there
so as to occupy diagonally opposite corner posi
tions in the rectangular socket with inward ex
posure of the contact surfaces. They accord
ingly provide contact surfaces of vertical shoulder
or ?attened rib like formation projecting within
the socket and provided with tapered upper or
entry portions. In cooperating and symmetrical
relation thereto the housing is formed with com
plementary vertical bearing ribs or shoulders i5
similarly projected within the socket at the other
of the diagonally opposite corners thereof. These
26
shoulders are likewise formed with tapered upper -
portions for inward de?ection of the insert ele
ments and provide, with the contact extensions‘,
symmetrically disposed bearing shoulders or sur
faces for engagement by the insert elements.
The insert elements, comprising the resonator or
crystal, the electrode plates on each side thereof
and the spring are assembled as indicated. They
are inserted from the top into the socket with
of molded insulating material and having inte
gral, combined terminal pin and contact plate ele
ments molded therein and having their contact
portions extending within the socket at opposite
sides thereof, a crystal element and opposite elec
trodes associated therewith received within the
socket with one electrode engaging one of the
one of the electrodes, the left hand electrode as
shown, engaging one of the contacts [4 along one .,
vertical marginal edge and engaging the housing
shoulder at its opposite vertical marginal posi
tion.
The opposite electrode is electrically con
nected with the opposite contact extension by
means of the interposed spring II engaged there
with and having its outer enlarged coil in pres
sure engagement with the opposite or right hand
contact extension and, in balanced supporting
with received within the socket with one elec
trode engaging one of the contact plates and a
coil spring interposed to engage the opposite of
said electrodes and the other of said contact
plates for closing of the electrical circuit.
3. A frequency determining unit of the char
acter described comprising a housing member
provided with a rectangular socket for the recep
tion of a resonator element, said housing being
contact plates and a coil spring interposed to
engage the opposite of said electrodes and the
other of said contact plates for closing of the
electrical circuit and a cover member secured
to the housing for the sealing of the socket.
4. A frequency determining unit of the char
acter described comprising a housing member
provided with a socket for the reception of a
resonator element, said housing being of molded
insulating material and having integral, combined
terminal pin and contact plate elements molded
relation, with the opposite, right hand, housing
therein and having their contact plates extending
shoulder it. There is thus produced an improved 50 within the socket at diagonally opposite corners
resonator unit of utmost simplicity of structure,
thereof, a crystal element and opposite electrodes
permissive of substantial economies in production
associated therewith received within the socket
and assembly and offering material, practical ad
with one electrode engaging one of the contact
vantages in use over constructions as heretofore
plates and a coil spring interposed to engage the
made.
55 opposite of said electrodes and the other of said
As will be appreciated different sizes of crystals
contact plates for closing of the electrical circuit,
may be accommodated by varying the dimensions
of the socket formed in the housing. Also, while
said contact plates being positioned to project
into the socket and said socket having inward
the cover is shown as secured by screws with an
shoulder projections diagonally opposite to the
interposed washer, it will be understood that the 60 contact plates for symmetrical support of the in
sert parts.
device may be further simpli?ed by securing of
the cover directly to the housing by a suitable
5. A frequency determining unit of the char
cement such as with a polystyrene cement there
by providing a seal of a more permanent char
acter.
acter described comprising a housing member
provided with a rectangular socket for the recep
65 tion of a resonator element, said housing being
As shown in Fig. 5 the cover member is formed
on its under or inner side with integrally trans
verse ribs !6 operative in a manner similar to
that of the housing ribs 8 to provide limited area
of molded insulating material and having inte
gral, combined terminal pin and contact plate
elements molded therein and having their contact
contact with the insert elements for reduction
in damping of the desired vibrations.
What is claimed is:
1. A frequency determining unit of the char
acter described comprising a housing member
opposite corner positions of the socket, a crystal
element and opposite electrodes associated there
provided with a socket for the reception of a res
portions vertically extending within diagonally
with received Within the socket and electrically
connected to the contact plates.
6. A frequency determining unit of the charac
ter described comprising a housing member pro
2,405,181
a
vided with a socket for the reception of a res
onator element, said housing being of molded
insulating material and having integral, com
bined terminal pin and contact plate elements
molded therein and having their contact plates
extending Within the socket at diagonally oppo
site corners thereof, a crystal element and oppo
site electrodes associated therewith received with
in the socket and electrically connected with the
contact plates, said contact plates being posi- "
tioned to project into the socket and said socket
having inward shoulder projections diagonally
opposite to the contact plates for symmetrical
support of the insert parts.
7. A frequency determining unit of the charac
ter described comprising a housing member pro
vided with a rectangular socket for the reception
of a resonator element, said housing being of
molded insulating material and having integral,
combined terminal pin and contact plate ele
ments molded therein and having their contact
portions extending within the socket at opposite
sides thereof, a crystal element and opposite‘elec~
trodes associated therewith received within the
socket and electrically connected with the con
tact plates, a cover member secured to the hous
ing for the sealing of the socket and said contact
plates being partially embedded in the side wall
of the socket and having inwardly beveled ex
tremities.
SAMUEL ALEXANDER BOKOVOY.
HANS STUNTZ.
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