US2732529A

US2732529A - Inductor structure

Info

Publication number: US2732529A
Authority: US
Publication date: 1956-01-24
Anticipated expiration: 1973-01-24

Description

Jan. 24, 1956 R. L REID ET AL 2,732,529

INDUCTOR STRUCTURE Filed April 21. 1.948

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LJU H N LAB A N Emma-,5 EARE'HENBPUNN @ME-MALEEIERT EELAYT/JN United States Patent INDUCTOR STRUCTURE Robert L. Reid, Indianapolis, Ind., John Laban, Grass Lake, Mich., George E. Archenbronn, Galeta, Calili, and Albert E. Slayton, Jackson, Mich., assignors to Radio Television Products Corporation, Grass Lake, Mich., a corporation of Michigan Application April 21, 1948, Serial No. 22,408

'8 Claims. Cl. 333-78 The present invention relates to structural improvements in the manufacture of inductors used in radio receivers and the like.

It is an object of the invention to provide an inductor structure which is electrically and mechanically stable under "all normal operating conditions yet may be economically.manufactured.

Another object is to provide an improved inductor of the typev described in which the terminal members constitute the main structural elements of the frame.

Another object is to provide an improved inductor construction of the type described having structural frame member serving in the plural capacity of terminals, structural tie rod, and spring contactor for the coil tuning capacitors.

A further object of the invention is to provide an in expensive yet effective means of holding part of the case structure against rotation and provide an elastic nut element for the adjustment screw for the cores within the coils.

These and other objects and advantages residing in the construction, arrangement, and combination of parts will more fully appear from the following specification and the appended claims:

In the drawings,

Fig. I is a side elevational view of the assembled inductor unit,

Fig. II is similar to Fig. I with the metallic shielding housing removed,

Fig. III is a vertical cross section view taken on line IIIIII of Fig. II,

-- Fig. IV is a section taken on line IVIV of Fig. III,

Fig. V is a perspective view of the structural terminal element,

Fig. VI is a perspective view of the insulating end blocks,

Fig. VH is an enlargement of a detail of construction,

Fig. VIII is a vertical sectional view of Fig. I,

Fig. IX is a view similar to'Fig. I of a modified construction, and

Fig. X shows the terminal of Fig. IX applied to the assembly.

Referring to the drawings, in Fig. I the inductor unit comprises a metallic shielding housing 12 closed at the top except for an aperture to provide clearance for the adjustment screw 14 and open at bottom to permit the structure of Fig. II to be inserted with a slip fit between the inside of the housing 12 and the insulating

end members

16 and 18. Tabs 20 are turned under as shown in Fig. I to engage the underside of the end member 18 to hold the parts assembled.

To describe the inductor unit, the

end members

16 and 18 may be identically molded parts of suitable insulating material. T-slots 20 are provided to receive the terminal tie rods 22 which are preferably formed of resilient metal. As shown in Fig. V, the rod 22 has an upper contact end 24 which is bent to form a slightly acute angle with the longitudinal portion 26, the purpose of which will be described later. As shown the portion 26 of each rod 22 has

deformable tabs

28 and 30 lanced out of the body of the portion with the end of each rod 22 formed into a terminal portion 32.

As more clearly shown in Figs. III, IV and V, the

end members

16 and 18 are molded with a rim 34, which with the separators 36 define spaces 38 in which the contact ends 24 of opposed rods 22 overlap each other but separated by the silver mica capacitors 40. The contact ends 24 in the assembly of Fig. III are shown at to the portions 26 of the rods 22 which results in a stress stable engagement between the ends 24 and the capacitors 40 for the reason that the ends 24 as shown in Fig. V are removed from an acute angleto the portions 26 in an unstressed state.

The transverse wall 42 of the

members

16 and 18 is shown with similar recesses 44 upon opposite sides thereof in the form of cylindrical portions 46 into which elongated lateral portions 48 open. The cylindrical portions 46 are provided to receive the opposite ends of the insulating core sleeve 50, preferably fabricated from relatively stiff yet deformable fibre stock. Prior to inserting the ends 52 of the sleeve 50 into the recesses 44, tension and ground members 53 and 53' of resilient wire have transverse portions 54 which are placed in the recesses 44 to be positioned adjacent the apertures 56 through which the adjustment screws 58 extend. The screws 58 carry the iron cores 60 adjustably located within the coils 62 mounted upon the sleeve 50.

In assembling the component parts shown in Fig. III, the sleeve 50 acts to space the

end members

16 and 18. With the sleeve 50 in place, the rods 22 are threaded through the T-slots 20 of the

ends

16 and 18 and tensioned to bring the ends 24 down as shown in Fig. III at the same time, the tabs 30 sp ing out to engage the under side of the projection 64. The parts are now rigidly held together with sufficient tension to embed the portions 54 into the ends of the fibre sleeve 50 to hold the same against rotation relative to the

ends

16 and 18.

In addition to locking the sleeve 50, the portions 54 are stressed into the threads of the screws 58 to hold the screws against axial movement except upon rotation. Thus it will be understood that the portions 54 enable the screws to be inserted in the apertures 56 and forced past the portions 54 without rotation yet provide fine adjust ment of the cores 60 upon rotation of the screws 58. As more clearly shown in Figs. II and VIII the members 53 and 53' project beyond the sides of the

ends

16 and 18 to resiliently engage the inside of the housing 12 to ground each of the cores 60 of the rods 22. Insertion of the structure of Figs. II and III completes the assembly of the unit of Fig. I. It will be understood that the terminal tie rods 22 function as conductive bus bars in the completed unit and provide the connection terminal portions.

To assemble the unit shown in Fig. III, the rods 22 are inserted into the slot 20 and the required number of silver mica capacitors are inserted between the overlapping ends 24 of the rods 22 disposed in the spaces 38 of the end 16. With the rods 22 untensioned the ends 24 will assume the positions shown in Fig. VII. The core sleeve 50 and its component parts are then brought into the unit assembly by inserting the adjustment screw 58, at the upper end, into the aperture 56 in the end 16, the wires 54 racketing over the threads until the end 52 of the sleeve 50 is disposed in the recess 44. Next, the rods 22 are threaded through the slots 20 of the lower end 18 and the lower screw 58 is projected through the aperture 56 until the lower end of the tube 50 is disposed in the recess 44. The rods 22 are now tensioned to stress the-ends. 24 into the position shown in Fig. III and the tabs 30 which are resilient spring outwardly after travers- 3 ing the slots 20 to engage beneath the projections 64. The terminals es of the coils 62 are then soldered to the tabs 68. To compensate for the overlap on opposite sides of the condensers do to the rods 22 below the condensers are slightly shorter in overall length.

In Fig. IX is shown a slight modification of the terminal tie rod 22 of Fig. V. As shown, the terminal rod 70 has

deformable tabs

72 and 74 spaced from the contact end 76 as to be bent out at right angles to engage with the under side of the projection 64' of the end members 16 and 18'. In the assembly of Fig. X, it will be understood that the tab 72 holds the contact 76 in fixed stressed position independently of the spacing action of the sleeve 50 or the tensioning of the members 116' and 13 by the terminal tie rods 22. As more clearly shown in Fig. IX, swallow tail tabs 78 assist in the attachment of the ends of the coils 62.

Having thus described our invention, what we claim as new and desire to protect by Letters Patent is:

1 An inductor unit comprising a pair of end members, opposed centrally located recesses in said end members, a fiber tubular spacing member having its ends telescoping in said opposed recesses, a coil supported upon the outside of said tubular member, a tuning core for said coil located within said tubular member, a longitudinally extending threaded adjustment member for said core, an aperture opening through one of said recesses through which said adjustment member extends, a spring wire supported on one of said end members in bridging relation to said recess against which one end of said tubular member abuts to partially imbed said wire therein, said spring member being disposed to one side of said aperture and having tangential engagement with the thread of said member.

2. An inductor unit comprising an end member, a tubular coil supporting member of deformable material, a core supported in said supporting member, a spring wire disposed across one end of said tubular member and partially imbedded therein, an adjustment screw connected to said core and extending through said end member, a portion of said spring wire having tangential stressed engagement with the threads of said adjustment screw to act as a nut, a metallic housing for said end member, one portion of said spring wire extending into grounding engagement with said housing.

3. An inductor unit comprising a pair of molded end parts of insulating material, a centrally located longitudinally extended tubular member disposed between said parts, recesses defined in the opposed faces of said parts in which the ends of said member are telescopically received. slots defined in opposed sides of each end part in axial alignmentwith the slots of the associated end part, longitudinally extending conductive tie rods of flat stock closely fitted in the axially aligned slots of said parts, said rods having integral projections thereon deflected into overlapping arrangement with said end parts to clamp said member between said end parts, said rods having connection-terminal portions extending beyond one of said end parts and said deflected portion associated therewith.

4. An inductive unit comprising a molded part of insulating material, a centrally located longitudinally extending member supported upon said part, a recess defined in a face of said part in which one end of said member is telescopically received, slots defined in opposite sides of said part, longitudinally extending conductive rods of fiat stock closely fitted in said slots, said rods having integral projections thereof deflected into overlapping arrangement with said part to restrain said rods against movement in said slots, condensers supported on a face of said part, certain of said integral projections being disposed in conductive contact with said condensers, other of said integral projections engaging with said part to maintain said conductive contact, said rods having portions constituting connection terminals removed from said part, said other ti projections being located on said rods between said terminals and said part.

5. An inductor unit comprising a pair of end members, a centrally located longitudinally extending member spacing said end members, longitudinally extending conductive tie rods of flat stock for drawing said end members toward each other to piace said spacing member under compression, axially aligned slots in said end members in which said rods are closely fitted to hold said tie rods against rotation and said end rods in rigid angular relationship with each other, there being integral portions of said rods extending beyond said end members and deflected into overlapping stressed engagement with end face portions thereof to hold the component parts of the unit in assembly, condensers mounted upon the end face of one of said end members and disposed between the overlapping deflected portions of said rods associated therewith with the stressed engagement of certain of said rods with said end member being through said condensers.

6. An inductor unit comprising an end member, a tubular coil supporting member of deformable material, a core supported in said coil supporting member, a spring wire disposed across one end of said tubular member and partially imbeddedtherein, an adjustment screw connected to said core and extending through said end member, a portion of said spring wire having tangential stressed engagement with the threads of said adjustment screw to act as a nut.

7. An inductor unit comprising a member having an unthreaded smooth bore opening defined therein, a tubular coil supporting member axially aligned with said opening, a length of spring wire disposed across said opening with the ends of said wire afiixcd to said first member to support the same against lateral displacement, a core supported in said coil supporting member, an adjustment screw connected to said core and extending through said smooth bore opening, a portion of said spring wire between the ends thereof being deflected by and having tangential stressed engagement with the threads of said adjustment screw to act as a nut therefor, said wire constituting the sole means in cooperation with said threads for axially moving said screw relative to said first member upon rotation of said screw as well as constituting a locking means for said screw against unintentional rotation.

8. An inductive unit comprising a molded part of insulating material, a centraliy located longitudinally extending member supported upon said part, a recess defined in a face of said part in which one end of said member is telescopically received, slots defined in opposite sides of said part, longitudinally extending conductive rods of fiat stock closely fitted in said slots, said rods having integral projections thereof deflected into overlapping arrangement with said part to restrain said rods against movement in said slots, certain of said integral projections being disposed on one side of said part, other of said integral projections engaging with an opposite side of said part, said rods having portions constituting connection terminals removed from said part, said other projections being located on said rods between said terminals and said part.