US3101463A

US3101463A - Shielded electrical coil assembly

Info

Publication number: US3101463A
Application number: US777423A
Authority: US
Inventors: Herbert M Penningroth
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1958-12-01
Filing date: 1958-12-01
Publication date: 1963-08-20
Anticipated expiration: 1980-08-20

Description

g- 1963 H. M. PENNINGROTH 3,

SHIELDED ELECTRICAL con. ASSEMBLY Filed Dec; 1, 1958 INVENTORQ .9 6/. Amy

. FIGURE 3.

SHIELDED ELECTRHCAL (H, ASSEMBLY Herbert M. Penningroth,Halcs Corners, Wis, assignor to General Motors Corporation, Detroit, Mich, a corpm ration or Delaware v Filed Dec. 1,1958, Ser. No. 777,423

4 Elaims. (Cl. 836-87) This invention relates to an improved assembly for elec trical coils and more particularly to an intermediate frequency transformer assembly of the type usedin radio for the electrical components is slid-ably fitted within the can and supports terminal pins which extend through the chassis for external circuit connection and also supports a coil form which carries at its upper end a shield cover for the can. The base is secured to a chassis for wired circuits by a screw or to a chassis for printed circuits by soldering the terminal pins to the printed circuit conductors. This construction permits the can to be formed of tube stock, of either rectangular or circular cross section, and obviates the need for deep-drawn shield can parts. It greatly facilitates servicing of the components since removal is accomplished through the upper end of the can and adjustment of a core within the coil form may be made from either side of the chassis.

A more complete understanding of this inven'on may be had from the detailed description which follows taken with the accompanying drawings in which: I

FIGURE 1 is a sectional view of the inventive coil assembly on a wired circuit chassis taken on lines 1'1 of FIGURE 2;

FIGURE 1; a

FIGURE 3 is a fragmentary view of the coil assembly on a printed circuit chassis with a section taken on lines 33 of FIGURE 4-; and v FIGURE 4 is a bottom View of'the assembly shown in Referring now to the drawings, there is shown an illustrative embodiment of the invention in an assembly for intermediate frequency transformers. As shown inFIG- URES l and 2, the IF transformer is installed on a metal chassis plate 10 adapted for wire connected circuits and comprises a tubular metal shield can 12 which is open at both ends and provided at its lower end with a pair of bendable tabs 14 and 16. The tabs extend through an opening or cutout 17 in the chassis and are bent over and soldered thereto to provide rigid mechanical support and electrical contact. Disposed within the can is a base 18 of insulating material which is slidably fitted within the can and seated against the portions of the chassis which extend within the confines of the can 12. The base 13 supports terminal pins 20, 22, and 23. A tubular coil form 24- of insulating material and open atboth ends has its lower end secured to the base 18 and'extending into respective terminal pins. A fixed condenser'32 is disposed FIGURE 2 is a bottom View of the assembly shown in cludes'a peripheral flange embracing ormating with the upper end of the can. The cover completes the shielding of the components and provides rigid support for thecoil form. The inductance of the coil 30 may be varied for tuning the intermediate frequency transformer by a thread core fidhaving a tool engaging recess in both ends for axial adjustment from either the top or bottom of the chassis. The base 18 is removably secured to the chassis by a screw 36 extending through a clearance hole in the chassis tab 38 into threaded engagement with the base 18. With the IF transformer installed on a metal chassis for wired circuits, the shield can 12 is fixedly mounted on and electrically connected to the chassis by the tabs 14 and 16 and need not be removed for replacement of or servicing the electrical components contained therein. After disconnecting the external wired circuits from the terminal pins and removing the screw 36, the base together with the electrical components may be removed from the shield can by lifting the shield cover 26. r s

As shown in FIGURES 3 and 4, the same IF transformer is installed on a printed circuit chassis plate or board 46 of insulating material. The board includes commen or

ground conductor strips

42 and 44 and circuit conductor strips 46, 43, and 5t} embedded in and adhered to the lower surface. The shield can 12 is secured to the plate 4%} by the tabs 14 and 16 which extend through openings in the board and are bent over and soldered to the ground conductor strips 42 and 44-. The base 18 is se-' cured to the board by the terminal pins 20, 22, 'and 23 which extend through the board 40 in alignment with the

circuit conductor strips

46, 48, and 50 and are soldered thereto. The board defines an access passage 52 in align ment with the coil form. I

When the IF transformer is used on the printed circuit board, the shield can 12 may remain fixedly mounted on the board and the base 18 together with the electrical components may be removed from the top of the chassis, after unsoldering the terminal pins, by lifting the shield cover 26. The thread core is accessible fromeither open end of the coil form for adjustment of the IF transformer frequency.

Although the description of this invention has been given with respect to a particular embodiment, it is not adjacent the coil form" and supported by its lead wires to be construed in a limiting sense. Numerous variations and modifications within the spirit and scope of the invention will now occur to those skilled in'the art. For a [definition of the invention, reference is made to the appended claims.

I claim:

1. In combination with an electrical chassis having two sides defining an opening and being adapted to support electrical conductors on one side thereof; a tubular shield can disposed on the other side of the chassis over said opening and being open at'both ends, the lower end of the can including a pair of oppositely disposed integral tabs extending through the chassis and bent over to per- "lower end of the can and formed ofinsul-ating material defining a central opening, a plurality of terminal pins supported by and extending through the base, a tubular coil form open at both ends, a core movably mounted within the coil form, the coil form having a lower end extending intothe'central opening and secured to the base whereby the core is accessible through the central opening in the base, a coildisposed on the coil form and electrically connected with the terminal pins, and a shield cover including a peripheral flange surrounding the upper end of the can and defining a central opening surrounded by an annular flange, the upper end of the coil form mating with and secured to the annular flange whereby the core'is accessible through the central opening in the cover and the peripheral flange of the cover forms a grasping portion for removal of the coil assembly from the can, and fastening means operatively connected with the base for securing it to the chassis.

2. In combination with an electrical chassis having two sides and defining an opening and being adapted to support electrical conductors on one side thereof, a tubular shield can disposed on the other side of the chassis over said opening and being open at both ends, means. at the lower end of the can for securing it to a chassis, a removable coil assembly comprising a support base disposed Within the lower end of the can and formed of insulating material tdefining a central opening, a plurality of terminal pins supported by and extending through the base, a tubular coil form open at both ends, a core movably mounted within the coil form, the coil formhaving a lower end extending into the central opening and supported by the base whereby the core 'is accessible through the central opening in the base, a cover including a peripheral flange and a central opening surrounded by an annular flange, said annular flange being disposed over andsecured to the upper end of the coil form whereby the core is'accessible through the central opening in the cover, a coil on said coil torm having a pair of terminals electr-ically connected respectively with a pair of the terminal pins, a screw adapted to extend through the chassis into threaded engagement with said base for securing the base against the chassis with the peripheral flange of the cover surrounding the upper end of the shield can, said core having a tool engaging recess on both ends for adjustment from either side of the chassis.

3. In combination, a removable coil assembly comprising a tubular shield can open at both ends, a shield cover including a peripheral flange surrounding the upper end of the can and defining a central opening surrounded by an annular flange, the lower end of the can terminating in a pair of oppositely disposed tabs, a chassis plate of insulating material having two sides and defining an opening and including a pair of conductive strips adhered to one side thereof, the lower end of the can being disposed on the other side of the plate with the tabs extending through the plate and bent over to permanently secure the tabswith respective strips, a support base of insulating material disposed within the can adjacent the plate and defining a central opening, a plurality of terminal pins extending through and supported by the base, a tubular coil form open at both ends, a core movably mounted within the coil form, the coil form having a lower end extending into the central opening in the base and secured to the base whereby the core is accessible through the central opening in the base, a coil disposed on the form and electrically connected with the terminal pins the upper end of the coil form mating with and secured to the annular flange whereby the core is accessible through the central opening in thecover and the peripheral flange of the cover forms a grasping portion for removal of the coil assembly from the can, said plate including plural circuit strips adhered to one side thereof and aligned with respective terminal pins, said pins extending through the respective circuit strips and being soldered thereto.

4. In combination, a removable coil assembly comprising a tubular shield can open at both ends, the lower end of the can including a pair of oppositely disposed integral tabs, a chassis plate of insulating material having two sides and defining a pair of openings aligned respectively with said tabs and including a pair of conductive strips adhered to one side adjacent the openings, the lower end of the can being disposed on the other side of the plate with said tabs extending through the openings and being bent-over into permanent contact with the conductive strips, a support base formed of insulating material disposed within the shield can adjacent the plate and defining a central aperture, a plurality of terminal'pins supported by and extending through the base, a tubular coil form open at both ends, having the lower end disposed in the aperture and supported by the base, a coil supported on the coil form and connected electrically to the terminal pins, a shield cover including a peripheral flange and defining a central passage surrounded by an annular flange, the upper end of the coil form mating Withv and secured to the annular flange, said plate including a plurality of conductive circuit strips adhered to said one side, the plate and circuit strips defining apertures aligned with respective terminal pins which pass therethroughand are soldered to the respective circuit strips with the peripheral flange of the cover embracing the upper end of the shield can, said plate also defining a passage in alignment with the coil form, and a thread core movably mounted in the coil formaccessible from either end thereof.

References titted in the file of this patent UNITED STATES PATENTS

Claims

1. IN COMBINATION WITH AN ELECTRICAL CHASSIS HAVING TWO SIDES DEFINING AN OPENING AND BEING ADAPTED TO SUPPORT ELECTRICAL CONDUCTORS ON ONE SIDE THEREOF; A TUBULAR SHIELD CAN DISPOSED ON THE OTHER SIDE OF THE CHASSIS OVER SAID OPENING AND BEING OPEN AT BOTH ENDS, THE LOWER END OF THE CAM INCLUDING A PAIR OF OPPOSITELY DISPOSED INTEGRAL TABS EXTENDING THROUGH THE CHASSIS AND BENT OVER TO PERMANENTLY SECURE THE CAN TO THE CHASSIS, A REMOVABLE COIL ASSEMBLY COMPRISING A SUPPORT BASE DISPOSED WITHIN THE LOWER END OF THE CAN AND FORMED OF INSULTING MATERIAL DEFINING A CENTRAL OPENING A PLURALITY OF TERMINAL PINS SUPPORTED BY AND EXTENDING THROUGH THE BASE, A TUBULAR COIL FORM OPEN AT BOTH ENDS, A CORE MOVABLY MOUNTED WITHIN THE COIL FORM, THE COIL FORM HAVING A LOWER END EXTENDING INTO THE CENTRAL OPENING AND SECURED TO THE BASE WHEREBY THE CORE IS ACCESSIBLE THROUGH THE CENTRAL OPENING IN THE BASE, A COIL DISPOSED ON THE COIL FORM AND ELECTRICALLY CONNECTED WITH THE TERMINAL PINS, AND A SHIELD COVER INCLUDING A PERIPHERAL FLANGE SURROUNDING THE UPPER END OF THE CAN AND DEFINING A CENTRAL OPENING SURROUNDED BY AN ANNULAR FLANGE, THE UPPER END OF THE COIL FORM MATING WITH AND SECURED TO THE ANNULAR FLANGE WHEREBY THE CORE IS ACCESSIBLE THROUGH THE CENTRAL OPENING IN THE COVER AND THE PERIPHERAL FLANGE OF THE COVER FORMS A GRASPING PORTION FOR REMOVAL OF THE COIL ASSEMBLY FROM THE CAN, AND FASTENING MEANS OPERATIVELY CONNECTED WITH THE BASE FOR SECURING IT TO THE CHASSIS.