US 2377265 A
Description (OCR text may contain errors)
May 29, 1945. w J Y 2,377,265
SEALED-IN REGULATOR Filed Jan. 9, 1942 1/1/17/119172 HEB V HIS ATTORN EYE Patented May 29, 1945 2,311,205 SEALED-IN REGULATOR;
William J. Rady, Anderson, Ind., aaaignor to General Motor. Corporation, Detroit, Micln, a corporation of Delaware Application January 9, 1942, Serial No. 426,154
This invention relates to apparatus for controlling the circuit between the storage battery and the generator and for regulating the generator. The circuit connections are controlled by the reverse current relay which closes when the generator voltage exceeds the battery volt-' age' and disconnects the generator from the battery when the generator voltage falls below the battery voltage. The generator is regulated by a voltage regulator, or by a voltage regulator and a current regulator.
An object of the invention is to provide for the economical manufacture of sealed regulator units filled with inert gas in order to protect the contacts of the regulators from oxidation. To accomplish this, I provide the regulator units with a base comprising an insulating disc formed from a sheet of hard insulating material and apertured for receiving and correctly spacing the terminal members, plug or threaded studs, as the case may be. Upon the insulating disc is located a metal plate of larger diameter and apertured, providing holes which will clear the terminal members projecting through them. Upon the metal disc is located a soft rubber disc having apertures through which the terminal extends. The soft rubber disc is vulcanized to the metal disc and to the terminals so as to insulate the terminals. Upon the rubber disc is located an insulating disc to which the regulator magnet and contact assembly are attached. The insulating disc is apertured to receive the upper ends of the terminals which are riveted over against the disc thereby clamping the four discs against shoulders provided by each of the terminals and bearing against the first-mentioned insulating disc. The regulator magnet and contact assembly is enclosed by a cup-shaped housing having an annular flange so formed as to provide a shoulder against which the inner surface of the rubber disc bears when the base and the housing are assembled. The outer edge of the annular flange of the housing is forced against the peripheral portion of the metal disc thereby placing the peripheral portion of the soft rubber disc under compression. The edge of the flange is soldered to the metal disc to provide an effective seal between the base and the housing. The flat face of the housing is provided with a short tubular extension adapted to be attached to a pipe connected with a vacuum pump, for withdrawing air from the housing, and then connected with a supply of inert gas. After evacuating and filling and then evacuating and filling the second time, the housing of the extension is pinched together and sealed by soldering. This matter of sealing the housing of the regulator is found to be effective in retaining an inert gas under atmospheric pressure and even under pressure substantially greater than atmospheric for an indefinite period.
Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein preferred embodiments of the present invention are clearly shown.
' In the drawing:
- Fig. 1 is a plan view of the voltage regulator unit embodying the present invention but with the cup-shaped housing omitted;
Fig. 2 is a side view with the cup-shaped housing in section before sealing the tubular extension thereof v Fig. 3 is a sectional view taken along the line 3-4 of Fig. 1;
Fig. 4 is a fragmentary sectional view showing one of the plug terminals connected with a socket member on the mounting base;
Fig. 5 is a plan view of a current regulator embodying the present invention, the cup-shaped housing being omitted;
Fig. 6 is a side view thereof with the housing shown in section and after the tubular housing extension is sealed;
Fig. 7 is a fragmentary sectional view showing the connection of a threaded terminal stud member of the unit with a conductor carried by the mounting bracket;
The voltage regulator will first be described with reference to Figs 1 to 4. The base of this regulator comprises a non-conducting plate 20 (Fig. 3) formed from a sheet of hard insulating material and provided with apertures for receiving three plug terminals 2i, 22 and 23 located as shown in Fig. 1. The upper portion of these terminals, such as 23a Fig. 4, fits snugly within openings in plate 20. Next to the plate 20 is located a metal disc 24 having holes spaced according to the spacing shown in Fig. 1, but of larger diameter than the plugs 2| to 23. Disc 24 is greater in diameter than the disc 20. A compressible body or disc 25 is vulcanized to the metal disc 24 and to the plugs 2| to 23, which pass through the disc 25. The disc 25 is preferably made of soft non-porous rubber. Next to the disc 25 is located an insulating disc 28 of hard material upon which is secured a regulator magnet and contact assembly to be described. The disc 26 is smaller in diameter than the rubber disc 25. After attaching this assembly to the disc 28, it is placed upon the assembly of discs 2|, 24 and 25, and plug! 25 to 22-pass through apertures provided by the disc 25. The upper end of the plugs are riveted'over,
as indicated, for example, at 22b (Fig. 4), thereby forcing all of the discs 25, 24, 25 and 25 downwardly against shoulders provided by the plugs, for example, the shoulder 220 (Fig. 4). This causes some of the material of soft rubber disc 25 to be forced in the holes in the disc 24 surrounding the plugs. The riveting over of the plug upper ends, as at 2212, and the vulcanization of disc 25 to the plug terminals and to the metal disc 24 contribute to provide an eifective seal between the disc 25 and the plugs extending therethrough.
As shown in Fig. 3, the regulator magnet and contact assembly comprises an L-shaped magnetizable bracket 25 which is apertured at 2| to receive a reduced lower end 22 of a magnet core 22 extending through a magnet winding 34 and a bracket 35 and having a head pole piece 25. The portion 22 passes along through the disc 25 and is riveted over at 220 thereby securing the disc 28 to the bracket 25. The bracket 25 is provided with a squirt 21 received by a hole in the disc 25 to prevent the bracket II from turning relative to the disc 25. The upper end of bracket 30 is bifurcated to provide a pair of cars 40 each of which is attached by a rivet 4| to the bifurcations of leaf spring blades or members 42 and 43 which are located between an armature 44 and a rigid plate 45, these parts being fastened together by rivets 46. The magnetic path of the regulator is provided by the core 25 to bracket 30 and the armature 44. The spring blades 42 and 48 may be made of dissimilar metals so as to provide for a change in the air gap between the armature 44 and the pole 25 in order to compensate for the variations in the current flow through the windings 24 due to changes in temperature. To facilitate this act the bifurcations of the spring blade 42 are provided with humps 41, as shown in Figs. 1 and 2.
The blade 43 has its free end inclined upwardly away from the armature 44 and carries a contact 50 having a spherical face for engaging a flat face of a contact'5l carried by a resilient arm 52 of a bracket 53 insulatingly supported by the arm 35a of bracket 25 and attached thereto by a screw 54. The contact 55 is urged into engagement with contact by a coil spring 55 connected with a hook 56 of the plate 42 and with a hook 51 of a bracket 55 attached to bracket 25 by rivets 59 integral with bracket 55. The action of spring 55 is such as to cause the arm 52 to bend upwardly after its contact 5| has been engaged by the contact 50. Therefore, there is a wiping action between the contacts 50 and 5| before they are separated and there is a wiping action after they are brought together. This wiping action assists in keeping the contact surfaces in good condition.
The regulator is enclosed by the base and by a cup-shaped housing Bil having its peripheral edge so shaped as to provide a shoulder at II for receiving the upper surface of the rubber disc 25 and to provide an annular portion which fits snugly against the edge of the rubber disc 25 and having a portion 65 formed against the outer surface of the metal disc 24 with such pressure as to cause the peripheral portion of the rubber disc 25 to 'be squeezed against the shoulder 5| and the annular portion 52 of the housing 60. The flange 63 is soldered to the metal disc 24 as indicated at Ma. Thus an effective seal is provided between the base 24 and the housing II.
The flat side of the housing 55 is provided with a tubular neck 55 adapted to be engaged by a suitable fitting 552: connected by a pipe having'a valve (not shown) by which the pipe may be placed in communication either with a vaccum pump or with a source of the inert gas under pressure. The housing ll is first evacuated and then is filled with the gas. such as nitrogen, for example. The nitrogen is withdrawn taking with it a greater portion of air which may have been left within housing after the first evacuation. Then the housing is filled again with nitrogen and the housing is sealed by pinching together the extension 05, and soldered as shown in Fig. 6. Obviously several evacuations and filling with nitrogen may take place before sealing, in order to eliminate as much air as possible. This matter of sealing the housing has been found to be very effective since nitrogen may be maintained under pressure substantially greater than atmospheric without any appreciable diminution of the pressure for an indefinite period. It is believed that this sealing i effective in maintaining the inert gas in the housing and excluding air over the period equal to the life of the instrument.
The winding 24 of the voltage regulator comprises a generator voltage responsive coil and a field current carrying coil. (h e end of generator voltage responsive coil is connected with core 22, the other end with a wire 55 which is connected with the terminal 22 (Fig. 1). The field current carrying coil is connected by wire 57 (Fig. 2) with bracket 52 carrying contact II. The other end of the coil is connected by wire 58 (Fig. 1) with plugs 2|. The frame II is connected by short lead 52 (I "ig. 2) with plug 22. The above connections are all made before the housing 55 is attached to the base.
Thus, I have provided a voltage regulator which is hermetically sealed in a gas filled chamber. I designate this regulator in its entirety by numeral II.
The current regulator designated in its entirety by numeral 25 is like the voltage regulator II in many respects. Where the parts of the current regulator are exactly like those of the volta e regulator similar reference numeral have been used to designate the similar parts. The current regulator differs from the voltage regulator in that the core 23 is surrounded by one magnet coil 54 of relatively coarse wires having its ends connected with terminal clips 54a and 24b con nected respectively with threaded terminal studs 55 and 55. As shown in Fig. 7 stud 55 provides a shoulder 26a bearing against the underside of the disc 25. The upper end of stud I5 is riveted over at "b against the clip 24b having an ear 54c projecting into a hole in the disc 25 in order to prevent the tuning of clip 84b. The clip 24a is secured to the stud 55 in a similar manner. Plug 52 performs the fimction oi' plug 22 of voltage regulator II. That is, plug 23 is connected by a wire "a (Fig. 6) with frame 30. Plug II is directly connected by wire lid with bracket 52 which carries contact 5|.
The contacts of either regulator control the opening and closing of a short-circuit around a resistance unit in the field circuit of the generator to be controlled. The resistance unit is not shown but it will be understood that it is mounted upon the base or instrument board upon which the regulator is mounted. the base providing the sockets which receive the terminal plugs of the the second mentioned plate to hold the members regulator. Such bases are disclosed in my copending application Serial No. 435,560, flied March 20, 1,942, which became Patent No. 2,348,- 263 on May 9, 1944.
While the embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow What is claimed is as follows;
1. A sealed regulator enclosure for a vibrator and an inert gas for protecting the contacts,
shanks extending through the aligned openings,
said shanks having securing portions bent over in assembled relation and also the compressed areas of the body so that it will flow firmly against the shank and into the spaces between the shank and marginal walls of the openings in the metallic member to provide a fluid seal therebetween; electrical connections between the vibrator and the plugs; a metallic cup-shaped housing for enclosing the vibrator and the base, the mouth of the housing being so shaped to provide a shoulder and a flange, said flange surrounding the peripheral edges of the metallic disc and the bodv of resilient material; and mean including a part of the flange cooperating with the bottom side of the metallic disc for securing the base to the housing and also for compressing the resilient body between the shoulder of the housing and the disc whereby the peripheral edge of the body is squeezed against the flange of the housing to provide an eilective fluid seal between the base and the housing.
2. A sealed regulator enclosure for a vibrator and an inert gas for protecting the contacts, said enclosure comprising in combination a base including an outer disc of non-conducting material having spaced openings for receiving terminals; a metal disc overlying the first disc and apertured to receive shanks of the terminals; a nonporous rubber disc bonded to the metal plate and the shanks to provide a fluid seal therebetween; an inner disc of non-conducting material supporting the vibrator and having openings through which the upper ends of the shanks extend, said shanks being riveted over the inner disc to clamp the discs against collars provided by terminals and engaging the outer disc; a metal cup-shaped housing enclosing the vibrator and base, the open end of the housing having an annular flange so formed to provide a shoulder against which the rubber disc bears; and means including a part of the'flange cooperating with the metal disc for securing the base to the housing and thereby placing the peripheral portion of the rubber disc under compression to cause it to seal eilectively the joints between the base and housing.
3. A sealed regulator enclosure for a vibrator and an inert gas for protecting the contacts, said enclosure comprising in combination a base including a metal plate apertured to receive shanks of the terminals but clear of metal plate; a soft body of resilient material vulcanized to one sideof the plate and having openings to receive the upper portions of the shanks of terminals extending above said side of the plate; a plate of non-conducting material supporting the vibrator and resting on the soft body, said non-conducting plate having openings through which the upper ends of the shanks extend, said upper ends of the shanks being deformed over the non-conducting plate to hold the metallic plate, of soft resilient material body and non-metallic plate in assembled relation to provide the base and also causing the resilient materialto fill the space between the terminal shanks and the metal plate to provide a fluid seal thereat; a metallic cupshaped housing enclosing the vibrator and base, the open end of the housing having a peripheral flange complementary to the contour of the metallic plate and so formed to provide a shoulder against which the body of resilient material bears; means including a part of the flange c0- operating with the under side of the metallic plate for securing the base to the housing and thereby placing the peripheral portion of the resilient body under compression to cause it to engage firmly the flange of the housing; and means for providing an effective seal between the base and housing comprising a fusible material disposed between the bent over portion of the flange 'nd the metallic plate.
4. An electrical device of the type comprising a metallic cup-shaped container having an internal shoulder at its open end, an operating unit therein including a fluid ingredient, said unit including an insulating base having spaced openings and means for attaching the unit to the base, the combination therewith, of a composite closure for the container including an insulating disc, a metallic disc and a soft rubber disc, each disc having openings in alignment with the openings of the base with the openings of the metal disc being larger in cross dimensions; terminals extending through the openings, said terminals being provided with shoulders against which the insulating disc rests; means including portions of the terminals cooperable with the base for clamping the discs and base together and for compressing the rubber disc causing portions thereof to flll the space between the metal disc and terminals to form a fluid tight seal thereat; electrical connections between the unit and terminals; and means for securing the closure to the container, said means compressing the periphery of the rubber disc against the shoulder for providing a fluid tight seal thereat.
5. A sealed enclosure for a vibrator and an inert gas for protecting the contacts of the vibrator comprising the combination of an insulating disc supporting the vibrator; a metal disc and a nonporous rubber disc vulcanized to the metal disc and disposed below the insulating disc; a second insulating disc disposed below the metal disc, said discs having aligned openings with the opening in the metal disc larger in dimensions than the other openings; terminal spective shoulders against which the discs rest; means unitary with the terminals cooperating with the first mentioned disc for clamping the discs against the shoulders and also compressin the rubber disc causing portions of the rubb'er disc to be forced into the enlarged opening of the metal disc to provide an effective fluid seal between the rubber disc and the terminals; elecmembers passing through the openings, said terminals having retricai connections between the terminal members and the vibrator; a metallic cup-shaped housing for enclosing the vibrator, said housing having a peripheral ledge against which the peripheral edge of the rubber disc contacts; and means for securing the discs to the casing, said means comprising a flange exterior of the ledge and turned inwardly against the bottom face of the metal disc for compressing the peripheral edge of the rubber, disc between the metal disc and ledge to provide a fluid seal thereat; and fusible means for joining the flange to the metal disc to provide a second fluid seal.
6. A sealed enclosure for an electrical device and an inert gas for protecting the contacts of the device, said enclosure comprising in combination; a hollow metallic member having an opening and having an internal shoulder near the opening; a base assembly including a metal member and a non-porous yieldable member, said base assembly serving as a support for the device; means including portions of the hollow member for urging the base assembly inwardly to close the opening and for compressing the non-porous yieldable member against the shoulder, said hollow member being fluid-sealed internally at the shoulder; and fusible means joining the metal member of the base assembly to the hollow member to provide a metal seal ex- 30 gas leakage between the base assembly and the hollow member.
7. A sealed enclosure tor a circuit breaker and an inert gas for protecting the contacts thereof. said enclosure comprising in combination; a base including a member of non-conducting material for supporting the circuit breaker; a metallic plate member; a non-porous body 01' yieldable composition disposed between the members, said members and body having aligned openings; a plurality of terminals electrically connected with the circuit breaker and extending through the openings, said openings in the body adapted for snug encirclement of a portion oi the terminals: means for holding the members and body in assembled relation and enforcing the body in sealing contact with the terminals; a metallic hollow member provided with an opening and having an internal shoulder against which the periphery of the body of yieldable composition bears; means including portions of the hollow member engaging the exterior of the metal plate to secure the base to the hollow member and for compressing the periphery of the yieldable body with sealing contact with the shoulder; and fusible means joining the securing means of the hollow member to the metal plate to provide an alloy seal between the metal plate and the hollow member and thereby provide a plurality of barriers against inert gas leakage from the interior of the hollow member.
WILLIAM J. RADY.