US2038281A - Radio receiving apparatus - Google Patents

Description

April 21., 1936. E, A USTAF ON 2,038,281

RADIO RECEIVING APPARATUS Filed March 5, 1934 INVENTOR: Bow/NA. 60577050,

ATTORNEY.

Patented Apr. 21, 1936 UNITED STATES PATENT OFFICE Edwin A. Gustafson, Chicago, 111., assignor to Johnson Laboratories, Inc., Chicago, 111., a corporation of Illinois Application March is, 1934, Serial No. 714,019 3 Claims. (m n-242) The invention relates to tuning systems for radio-receiving apparatus and particularly to the type which includes inductance tuning, wherein are included relatively adjustable plates,

one of which carries an inductance coil, and the otherv oi. which carries a magnetic core, and the invention involves a new arrangement or the parts of such an apparatus whereby they may be readily dismantled, repaired and reassembled. V

The invention will best be understood it reference be had to the accompanying drawing in which- Figure 1 is a plan view, partly in section, showing the essential elements of the invention;

Figure 2 is a sectional view taken on the line 22 of Figure 1, the parts within the casing oi. the apparatus being shown in elevation, and

Figure 3 is a sectional view taken on the line 33 of Figure 1. 7

Referring to the drawing, l is a casing of usual character, in which the operative parts of the apparatus are assembled.

Within and secured to this casing is a plate 2 on which are mounted housings 3 for inductance coils 4 and their associated elements, all of which constitute no part of the invention and, therefore, require no description. These housings 3 are removably secured to the plate 2 by screws 5 which enter flanges of the plate.

The coils 4, their mountings 6, and their associated elements, are removably secured to the housings 3 by screws 1, each of which extends through a flange 8 of a housing and engages a 5 hole in a mounting 6.

The-separability of these parts 01' the device, and the absence of any proximate elements such as heretoforehave been associated therewith, enable theuser toreodilygainacoesstothemductance coil 4 or any other element which re quires attention.

The cores 9 and their housings I! are carried by aplate ll, andall or these elements consti tute an adjustable unit, the actuating means for the unit being a screw-threaded shaift II that extends inward through the casing l, engages a -W opening of slot for the reception of said inductance coil and ltsinnerendentersabearingllintheplate '2, the inner end being provided with a collar l5 s and a shoulder it, between which the plate is disposed, inorder to prevent the shaft l2 from moving longitudinally.

The advantages of this invention are due to the fact that a housing and a coil and its associated elements may be assembled and conveniently tested while still accessible and before the housing is united with the other elements of the apparatus, and also that, since the housing which includes the coil is detachably mounted on that side of the fixed plate which is opposite the side that is proximate the adjusting device of the apparatus, the housing may readily be removed without detaching other elements of the apparatus whenever it becomes necessary to gain access to and examine or repair the inductance coil or its associated elements.

A further advantage of the invention, due to the simplicity of the apparatus, is that its manui'acture is facilitated and its cost reduced.

ratus, including a fixed plate, a removable houslug disposed at one side of and carried by said plate, a removable inductance coil carried by said housing, a movable plate disposed at the other side of said fixed plate,= a corecarried by said movable plate and aligned with said inductance coil, and an adjusting mechanism for said movable plate and said core.

2. A tuning system for radio-receiving apparatus, including a fixed plate having an opening, a housing disposed at one side of and carried by said fixed plate, an inductance coil in said housing, a movable core aligned with said inductance coil and the opening of said fixed plate, and having an annular slot for the reception or said inductance coil, and an adjusting mechanism for moving said core until it substantially surrounds said inductance coil.

3. A tuning system for radio-receiving apparatus, including a fixed plate, a housing that is open at one end and is substantially closed at the other end, and also is removably attached at its open end to said plate, a removable 1nductance coil disposed within and supported by said housing, a magnetic core having an annular movable relatively to said inductance coil, and means for moving said core. i

' A. GUSTAFSONL}

Images