U.S. patent number 3,611,150 [Application Number 04/733,586] was granted by the patent office on 1971-10-05 for radio receiver housing forming a continuous shape with control knobs.
Invention is credited to Hermann Martin Timm, Gunter Wolf.
United States Patent |
3,611,150 |
Timm , et al. |
October 5, 1971 |
RADIO RECEIVER HOUSING FORMING A CONTINUOUS SHAPE WITH CONTROL
KNOBS
Abstract
A radio receiver in which the housing for the electronic circuit
elements and the control knobs for variable condensers, switches
and the like jointly form a body symmetrical relative to the axis
of the rotation of the control knobs or of each control knob and
circular in cross section perpendicular to the axis. The housing
jointly with the knob or knobs may thus have the shape of a
cylinder, sphere, ellipsoid of revolution and the like.
Inventors: |
Timm; Hermann Martin
(Frankfurt/Main, DT), Wolf; Gunter (Steinheim/Main,
DT) |
Family
ID: |
5680179 |
Appl.
No.: |
04/733,586 |
Filed: |
May 31, 1968 |
Foreign Application Priority Data
|
|
|
|
|
Jun 2, 1967 [DT] |
|
|
P 15 91 679.9 |
|
Current U.S.
Class: |
455/351; 312/7.1;
D14/197 |
Current CPC
Class: |
H04B
1/08 (20130101) |
Current International
Class: |
H04B
1/08 (20060101); H04b 001/08 () |
Field of
Search: |
;325/352,361 ;312/7
;181/31 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Griffin; Robert L.
Assistant Examiner: Bell; R. S.
Claims
What is claimed is:
1. In a radio receiver having a housing, a plurality of electronic
circuit elements in said housing, a plurality of actuating shafts
attached to respective ones of said elements in said housing and
projecting outward of said housing for turning the attached
elements about the axes of said shafts and a control knob on the
outwardly projecting portion of one of said shafts, the improvement
in said housing and in said knob which comprises:
a. said housing having an edge portion of circular cross section
perpendicular to the axis of said one shaft;
b. said control knob having an edge portion of circular cross
section perpendicular to said axis of said one shaft; and
c. said edge portions of said housing and of said control knob
having axially contiguous, coaxial, cylindrical, outer surfaces of
substantially the same diameter.
2. In a receiver as set forth in claim 1, said housing and said
control knob jointly having the shape of a body of revolution about
said one axis.
Description
BACKGROUND OF THE INVENTION
This invention relates to radio receivers, and particularly to
housings for radio receivers and associated elements.
The visible parts of a radio receiver usually consist mainly of a
housing and of control knobs mounted on the housing and connected
by rotatable shafts to circuit elements in the housing, such as
variable capacitors, switches, and potentiometers. The knobs often
detract from the appearance of the housing, particularly in small
transistor radios in which the conventional knobs cannot be reduced
in size in the same ratio at which the housing is reduced when
transistors replace electron tubes if the adjusted positions of the
knobs are to be read from a scale with adequate accuracy.
The object of the invention is an improvement in the shape of
housings and control knobs for radio receivers, particularly
transistor radios, which permits the positions of the control knobs
to be read precisely even on a very small radio without encumbering
the housing with conspicuously projecting knobs.
SUMMARY OF THE INVENTION
With this object and others in view, as will hereinafter become
apparent, the invention provides a housing of the type described
with an edge portion of circular cross section perpendicular to the
axis of rotation of one of the control shafts. The control knob
mounted on the shaft also has an edge portion of circular cross
section perpendicular to this axis, and the edge portions of the
housing and of the control knob are axially contiguous and of
substantially the same diameter.
If the outer, axially extending surfaces of the edge portions are
symmetrical relative to the axis, at least the edge portions
jointly have the shape of a body of revolution about the axis, and
the knob need not be conspicuous, regardless of its actual
dimensions. A smooth transition between the knob and the housing
proper is beneficial, and the surfaces of the edge portions should
be jointly defined, therefore, by a continuous function, such as a
straight line or a conic.
Other objects, additional features and many of the attendant
advantages of this invention will readily be appreciated as the
same becomes better understood by reference the following detailed
description of preferred embodiments when considered in connection
with the appended drawing.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing:
FIG. 1 shows a spherical transistor radio of the invention in
elevation;
FIG. 2 shows a cylindrical radio of the invention in a perspective
view; FIG. 3 shows a modified spherical radio in plan view.
FIG. 4 shows a modification of the radio of FIG. 1 in a
corresponding view; and
FIG. 5 illustrates the radio of FIG. 1 in partly sectional
elevation.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring initially to FIG. 1, there is seen a small,
self-contained table radio whose tuning knob is mounted on the
housing 2 for rotation about a common axis 5 with the knob 3 which
operates an on-off switch and the potentiometer of a volume control
in the housing 2 in a conventional manner, the electronic circuit
elements not being seen.
The knobs 1, 3 and the housing 2 jointly form a sphere which is
supported on an annular stand 4 fixed to the housing 2. The knobs
thus are spherical segments of one base, and the housing 2 is a
spherical segment of two bases. The axially contiguous edge
portions of the housing and of each knob are of circular cross
section perpendicular to the axis 5 and of the same diameter. In
every plane through the axis 5, the outer surfaces of the knobs 1,
3 and of the housing 2 are defined by a circle which is a
continuous function, and more specifically a conic.
The relative angular position of the knobs 1, 3 and of the housing
2 may be indicated by index marks (not shown) along the edge
portions, and the diameter of a circular scale so formed may be
chosen by suitably locating the base planes which separate the
housing from the knobs. Even if the tuning knob, for example, were
enlarged to constitute one-half of the sphere formed by the housing
and the knobs, and the scale were as long as it can be made on a
housing of the given shape, the knob would not be conspicuous.
FIG. 5 partly illustrates the internal structure of the radio
illustrated in FIG. 1. The knobs 1 and 3 are hollow spherical
segments and of uniformly small wall thickness, except for central
reinforcing bosses 8, 9 which conformingly receive the operating
shafts 6, 7 of the aforementioned, nonillustrated capacitor and
potentiometer with a snap fit or friction fit, as is
conventional.
The housing 2 is open along the flat bases so that batteries and
other elements, not themselves shown, are readily accessible for
servicing or replacement when the knobs are pried from their shafts
by a knife or similar thin instrument capable of being inserted
between the edge portions of the knobs and of the housing.
In the radio receiver illustrated in FIG. 2, the knobs 11, 12 are
identical cups of cylindrical shape and are coaxially attached to a
tubular housing 13 which is cylindrical and of the same
diameter.
The two knobs 14, 15 and the associated housing of the receiver
illustrated in FIG. 3 jointly form a sphere substantially as
discussed with reference to FIG. 1, but the axes of rotation of the
two knobs are at right angles to each other. In the modified
spherical radio seen in FIG. 4, the knob 16 is a spherical segment
of one base and controls the tuning capacitor. The stand 17 is a
cylindrical disc which may be rotated on the housing 18 about a
common axis with the knob 16 to control the current supply and the
sound volume, as described above.
Obviously, numerous other modifications of the housing and knob
arrangement of the invention will readily suggest themselves on the
basis of the above teachings. Conical, ellipsoidal or otherwise
ovate overall shapes are specifically contemplated.
* * * * *