US2009892A - Vibratory coil - Google Patents

Description

J y 30, 1935. B. M. LEECE 2,009,892

VIBRATORY COIL Filed May 9, 1935 Patented July 30, 1935 PATENT OFFICE VIBRATORY COIL Bennett M. Leece, Cleveland, Ohio, assignor to The Leece-Ncville Company, Cleveland, Ohio, a

corporation of Ohio Application May 9, 1933, Serial No. 670,085 4 Claims. (Cl. 200-90) This invention relates to a vibrating coil for voltage regulators and the like, and has for one of its objects to provide a coil which is inexpensive to produce and wherein the parts are compactly arranged and readily assembled into a vibrating coil which is effective as well as economical in construction, particularly for quantity production. e

A further object of the invention is to provide a construction having provision for automatic compensation for changesin the resistance of the winding or windings of the coil due to heating thereof without the necessity of a special thermally responsive resistance element. In brief, it is one of the objects 'to provide ,a vibrating coil wherein the desired voltage output of the generator with which the coil is-used ismaintained substantially constant without requiringthe use of expensive metals or materials; such as-a mate rial having a negative temperature coefficient, to prevent a change in the ampere "turns of the winding or windings of the coil due tochange in temperature. 3

A still further object is to provide an improved and simplifiedform of vibrating armature, preferably in the form of an inexpensive stamping which lends itself readily to quick assembly in the built-up structure of the coil withoutrequiring a pivot; and, further, to form thisivibrating armature in a manner such that it has a high-:rate of vibration when the coil is in use.

In the accompanying sheet of drawing, Fig. 1 is a longitudinal sectional View through a vibrating coil embodying the invention in its preferred form; Fig. 2 is a top plan View; Fig.3 is a sectionsubstantially along the line 3--3 of Fig. 1,

(Figs. 1, 2 and 3 showing the coil on an enlarged scale for the sake of clearness); and Fig. 4 is a diagrammatic view illustrating conventionally one system with which the coil maybe used to advantage. 7 V b My. improved vibrating coil is not confined to any particular system or to any particular number of windings which are housed in the metal shell of thev device. It may contain a single winding','.two' windings, or even more.

In Fig. AI have shown a vibrating coil having two windings with circuit connections similar to those disclosed in my prior Patent No. 1,633,671. With the system illustrated in Fig. 4, which finds its greatest use on automobiles tosupply current to the load at a substantially constant voltage regardless of speed changes. Ill represents the armature of the generator, the brushes of which are connected to the load circuit wherein the load consists of a battery H and lamps 22. The generator has a field winding 53 one terminal of which is connected to one of the brushes of the generator and the other to the stationary contact M of the vibrator. The movable contact 55 is carried 5 by a vibrating armature it which is usually pivotally supported on a frame or housing l! but which, according to the present invention, has a novel form and mounting to be described, the housing having a core [8 surrounded by one or more windings is, in this instance two windings designated 55c and till: in Fig. 4, which windings are sometimes termed the primary and the secondary. The stationary contact i is connected to one terminal of the winding llb while its other terminal is connected to one terminal of the winding l9a whose other terminal is grounded on the frame or housing ll. At the point where the two windings are connected, connection is made by means of a conductor 22 to one brush of the generator, the other brush being connected by a conductor 2! to the frame or housing ll. Between this conductor 2! and the conductor 22 which connects the field winding 3 to the stationary contact is is a resistance 23 which is cut into the field circuit when the contacts are sepaby the magnetic pull and which is shortcircuited when the contacts are in engagement, the armature being moved a way from the core so as to cause the movable contact 15 to engage the contact i i by a spring 24. It is to be understood that while I have shown'in some detail one crating and voltage regulating system, my vibr ing coil is not necessarily confined to a system such as fllustrated, particularly as to the number of windings on the core 33.

I It might be here stated that the present invention resides in the assembly of the different parts composing the vibrator and also in the construction and manner of supporting or mounting the vibrating armature l5 and in the location or relation of the spring 24 with respect to the core l8.

In the description of the details of constructionof these parts, the reference characters as applied to Fig. 4 and others will be utilized.

Referring first to Fig. 1, it will be seen that the housing I! includes. cylindrical shell l'la the, bottom of which is closed by a disk i which is-fitted into the shell and rests against a shoulder l'lc near the bottom thereof. The opposite end or" the shell is threaded interiorly there is fitted into the top an externally threaded disk lid constituting a nut by which the parts hereinafter referred to are clamped solidly against 55 each other and down onto the bottom disk or base l'lb. Extending upwardly from the bottom ill) of the shell fl'l centrally thereof is the core l8, and surrounding the core are the winding or windings E9, the same being shown convention- 'ally inasmuch as, as previously pointed out, the

number of windings may be varied from one to two or more.

however, that if two windings are employed, such as those illustrated in Fig. 4 at 90, and Nb, the primary winding We will be wound around the core and the secondary winding [9b on the primary. It will be understood, of course, that these will be preformed coils which, as a unit, can be slipped into the shell around the core. I may also wind about the secondary the resistance 23 of Fig.4, a wire resistance being preferably utilized. The two windings and the resistance, if the sameare provided in the housing, fill the space between the core and the cylindrical wall of the shell.

Between the winding 59 and the bottom disk llb is suitable insulation 25, and at the'top of the. winding there is similar insulation 26. Surrounding the upper or free end of the core and engaging the insulation 26 is a metal disk 2'! which fits closely in the shell Ila of the housing I1. It might be here stated that the shell Ha, the bottom disk Nb, and the core l8 are of course formed of magnetic material, such as steel, whereas the upper disk 21 is preferably formed of non-magnetic material, such as brass. The core may be supported on the lower disk or bottom closure Nb of the housing in any suitable way, but in this instance the lower end is reduced and is extended through a centrally disposed opening in the disk ill) and the lower end is peened over or upset to firmly secure it'to the i disk lib. The disk 2'8 of non-magnetic material also has a centrally disposed opening which fits fairly closely over the free end of the core so that the disk serves to centralize the core in the sleeve or shell 12.

The vibrating armature, in this instance, is novelly constructed and mounted, the same consisting preferably of a ring-like stamping 16a with an inwardly extending Vibratory arm lfib carrying on the upper side thereof the movable contact E5 which is arranged at the axis of the housing. The external diameter of the stamping I Sais such that it will fit closely in the shell Ma, and the annular or peripheral portion of the stamping is clamped between two rings 28 and 29, the latter being engaged by the clamping nut lid. The armature stamp-ing 16a, and the rings 28 and 29 are preferably formed of steel. It is to be here noted that the following parts, insulating disk 25, winding l9, upper insulating disk 26, disk 21, ringZS, armature stamping 16a, and ring 29, are dropped successively'into the 1 housing and all parts are tightly clamped together by screwing down the nut l'ld.

Fastened on top of the nut I Ed by a pair of insulated screws 30 is a bridging member 3! (see Figs. 1 and 2) having at the center or axis of the housing an upstanding flange or boss 3la. threaded on the interior and receiving an adjustable screw 32 which at its inner or lower end carries the stationary contact 14 which may be formed of any suitable material, such as tungsten. In this instance the tungsten is secured to a holder which is preferably made of brass in turn secured to the lower end of the screw.

Both the bridging member 3! and the screw car- For convenience, the same will be referred to as the winding l9. It may be stated,

rying the stationary contact are preferably formed of magnetic material, such as steel. The screw 32 will be adjusted to properly position the stationary contact I 4, after which it is secured in position by a lock nut 33.

Carried on the top face of the free end of the arm lfib of the armture stamping is the movable or vibratory contact I5 which, like the contact One of the important features of the inven tion resides in the arrangement of the spring 24 (which acts on the vibrating arm we of the armature to restore the contacts into engagement immediately after theyhave been separated by the magnetic pull of winding IE) not only to facilitate assembly'and to obtain a high degree of compactness, but also for-another purpose to be' mentioned presently. This spring .24 is located.

in a bore 34 extending centrally of the core 18 preferably throughout its length. This spring, which is a coil spring of considerable length, at its upper end bears against the under side of the arm of the vibratorat the axis of the coil and at its lower end bears against an'adjustable abutment adapted to be adjusted to vary the compression of the spring; For this purpose, the lower part of theboreM is enlarged and is internally threaded and receives an adjustable screw 35 a portion of which projects out through the bottom disk [lb of the coil, a lock nut 36 being provided to lock the screw in any position to which it may be adjusted; The lower end of the spring may bear directly against the upper end of screw 35, but in or'derfto avoid the use of an unnecessarily long screw, I may provide between the lowerend of the spring and the upper end of the screw a plug 31, which may be of brass, of

suitable length to serve as the direct abutment for the spring. 7

A very important functional advantage is attained by this arrangement in the'way of an automatic adjustment or compensation during the operation of the coil, for, when the windingheats up, due to the passage of current therethrough or from the heat of the engine, or otherwise, the resistance of the winding increases and its ampere turns correspondingly decrease, but with the present arrangement of the core and spring, this is automatically compensated for because the core expands lengthwise under the action of the heat and decreases the magnetic reluctance of the air gap and therefore increases the magnetic pull on the armature, while at the same time the action of the heat on the. spring causes the individual convolutions to expand and the diameter to increase, and this in turndecreases the effective length of the spring. Both of these results tend to increase the action of the winding on the armature in direct proportion to what would maintained constant and the voltage does not rial in the circuit of the winding, such as one having a negative temperature coefiicient, to neutralize or compensate for the increased resistance of the winding on heating.

The electrical connections to the parts inside of the housing may be made through one or more of the screws 30 or otherwise, as may be found most convenient.

It will be seen from the above that the advantages or objects stated at the beginning of the specification are attained in a very effective manner. The compactness and ease of assembly by reason of the fact that the parts can easily be slipped into the housing and secured in place by simply tightening down the nut lld, are obvious from the drawing, as is also the ease of adjustment of the contacts accomplished by adjustment of the screws 32 and 35 at opposite ends of the housing. These features contribute greatly to the low cost of production of the coil, as does also the armature which requires no pivot, and the fact that the arrangement of the spring within the bore of the core, as herein illustrated eliminates the necessity of a special compensating resistance or conductor in the winding circuit as has frequently been required heretofore.

While I have shown the preferred construction, I do not desire to be confined to the precise details shown, as changes may be made without departing from the spirit and scope of the invention, as defined in the appended claims.

Having thus described my invention, I claim:

1. A vibrating coil comprising a cylindrical shell having an end disk adjacent the lower end and a centrally disposed core supported by and extending from the disk, a winding surrounding the core, an armature having an annular peripheral portion, annular armature supporting members fitted within said shell and engaging opposite sides of said peripheral portion of the armature, and a closure for the upper part of the shell in the form of a nut screwed into the end of the shell for clamping cooperation with said end disk to hold the parts in assembled relationship.

2. A vibratory coil having a housing including a cylindrical shell, a bottom closure therefor in the form of a disk engaging the housing near one end and carrying a core extending centrally of the shell, a winding surrounding the core, a nonmagnetic centralizing disk fitted into the shell and having an opening for the free end of the core, a disk armature having an annular portion fitted inside the shell and a vibratory arm portion extending into cooperating relation with said free end of the core, and a clamping nut screwed down into the other end of the shell and forming a closure for said other end.

3. A vibratory coil having a housing comprising a cylindrical shell, a bottom disk seated at one end thereof and having a core extending axially of the shell, a winding surrounding the shell, a centralizing disk of non-magnetic material fitted into the shell and surrounding the core adjacent its free end, a pair of annular members fitted into the shell above said centralizing disk, an armature comprising an annular part fitted into the shell between said annular members and a vibratory part carried by the annular part, a contact on said vibratory part, and a nut screwed into the upper part of the shell for clamping together and holding in assembled relationship the above mentioned parts which are fitted into the shell, said nut carrying an adjustable centrally disposed contact for cooperation with the contact on said vibratory part.

4. In a vibratory electro-magnetic device the combination of an elongated housing having internal abutment means at one end thereof, a magnet spool comprising a core and end disks and a winding around the core and between the disks, said magnet spool being disposed in the housing'with its core extending axially thereof and with one disk engaging said abutment means and forming an end closure for the housing and the other end disk spaced inwardly from the other end of the housing, a closure having threaded connection with said other end of the housing and spaced from said other end disk to provide a chamber therebetween, a disk-like armature in said chamber and having a vibratory arm portion in proximity to an end of said core, a pair of cooperating contacts in said chamber one being carried on said arm portion and the other being carried on said closure, and supporting means in said chamber and fitted into the housing for engaging edge portions of said armature, said closure and said abutment means cooperating to clamp said spool and said armature supporting means therebetween.

BENNETT M. LEECE.

Images