US1870625A - Arcless receptacle and plug connecter - Google Patents

Description

Aug. 9, 1932. E. c. HELLWIG 1,870,625

ARCLESS RECEPTACLE AND PLUG CONNECTER I Filed Jan. 10, 1951- 4 Sheets-Sheet 1 INVENTOR Z772 afizzzu z y ATTORN EYS Aug. 9, 1932. E. c. HELLWIG ARCLESS RECEPTACLE AND PLUG CONNECTER Filed Jan. 10, 1931 4 Sheets-Sheet 2 llf lllllllllllt I (Tl/1170 10711111! lNVE NTOR CT fieZZWE q ATTORNEY-5 Aug. 9, 1932. E. c. HELLNIG ARCLESS RECEPTACLE AND PLUG CONNECTER LEEQQZS Filed Jan. 10, 1931 4 Sheets-Sheet 3 I .ifezzw INVENTOR ATTORNEYS Aug. 9, 1932. E. c. HELLWIG ARCLE SS RECEPTACLE' AND PLUG CONNECTER Filed Jan. 10, 1931 4 Sheets-Sheet 4 INVENTOR ATTORNEYS Patented Aug. 9, 1932 UNITED STATES PATENT OFFICE EMIL C. HELLWIG, 0F AURORA, ILLINOIS, ASSIGNOR TO THE PYLE-NATIONAL CONE-- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY ARCLESS RECEPTACLE AND PLUG CONNECTER Application filed January 10, 1931.

My invention relates to improvements in arcless receptacles and plug connecters and has for one object to provide in connection with a terminal plug and receptacle, means whereby one electric circuit may be plugged into another electric circuit and accomplish the transmission of power without the clos- The present invention contemplates a con-- necter for an electrical extension so made that no spark or are is created on connecting or disconnecting the plug member. This makes it suitable for combustible atmosphere such as in powder plants, Duco paint plants, grain elevators, oil refineries and the like.

The connecter is made with a transformer with a primary always in circuit with the line, consequently the extension is from the secondary with a reduced voltage of say 32 volts. The utilization of the 82 bolt extension line is possible without changing the standard voltage 01 110 of the main circuit and with which the connecter is installed.

The low voltage in the extension makes it possible to use the same with safety. The low voltage extension circuit not being grounded makes it doubly safe from electrical shock should the installation of the extension be defective. Furthermore, there is less chance of an are or spark through poor installation should any part of the extension circuit come in contact with some grounded object.

The primary is provided with a keeper which closes the magnetic circuit therethrough thus preventing burning out of the core and the prevention of the creation of excessive heat. inserted in the socket containing the primary and turned to lock the pipes together, such turning moves the keeper out of the path of the magnetic plug.

My invention is illustrated more or less dia- Oncethe plug member is Serial No. 507,821.

grammatically in the accompanying drawings, wherein- Figure l is a side elevation of the assembled plug and socket;

. Figure 2 is a longitudinal section through the socket and plug assembled to form a transformer;

Figure 3 is a section through the socket showing the cover closed- Figure 4 is a section through the plug at right angles to the section of Figure 2 showing the position it assumes as it is about to be engaged by the socket;

Figure 5 is a front elevation of the socket with the cover open before the plug has been inserted;

Figure 6 is a front elevation of the plug;

Figure 7 is a detail perspective of the receptacle core and coil assembly;

Figure 8 is a detail perspective of the plug core and coil assembly;

Figure 9 is a perspective of the socket cover showing diagrammatically its relation with the coil keeper;

Figure 10 is a perspective of the locking ring.

Like parts are indicated by like characters throughout the specification and drawings.

A is a socket having a supporting flange A by which the socket may be mounted on any suitable support; a conduit A leads from the socket and contains power conductors A The socket is bell mouthed as indicated at A and the mouth is closed by a cover A having hinge arms A pivoted on bracket arms A on the housing. A is a spring tending to hold the cover closed- A is a latch tongue on the cover adapted to cooperate with the plug to hold it in proper working position. A is the plug adapted to penetrate the bell mouth A of the socket A. This plug has a notch A to receive the locking tongue A to assist in holding the socket and plug in Working relation. A is a packing gland through which the conductor wires A extend to any suitable lamp or motor or any other electric machine or device which is to be supplied with power from the socket through the plug.

The plug A itself is hollow and contains a coil and core which will subsequently be described. The same thing is true of the socket. Contained within the bell mouth A of the socket is a locking ring A. It is slotted as at A. On one side of the slot is a stop A, on the other side of the slot a cam surface A" terminating in a notch A, on the other side of which is a stop A The end of the socket has a lug A. When the two are to be assembled, the plug is trust into the socket, the lug A entering from the back toward the front, as viewed in Figure 10, of the'holding ring through the slot A. The plug is then rotated causing the lug A to travel along the cam surface A" until it engages the notch A, further movement being prevented by the stop A Rotation of the plug in the wrong direction being prevented by the stop A Referring now to the socket, it will be noted that it contains a core B. This core is made of laminated iron and has arms B B B joined by a central base and containing a primary coil B excited by the wires A This core is mounted in a carrier sleeve B A spring B is introduced between the sleeve B. and the bottom of the socket and the sleeve is slotted at B and the slot is engaged by a guide pinB to prevent rotation of the carrier, limit its outward movement while leaving it free to be forced inwardly as the spring is compress-ed. The core and coil assembly is held in the carrier by the central screw B", which screw extending through the core and rotatable in the core and carrier has on its end a rotatable keeper B In the position shown in Figures 3, 5 and 7 the keeper is in the plane of the members I5 13 B and is in contact with all three of them, thereby closing the magnetic circuit through the core elements. The purpose of this is to reduce to a mlnimum the reluctance "so as to prevent resistance to currentfflow in the primary coil when current is not being supplied to and through the plug. Referring to Figures 3 and 9, it will be noted that the cover A has a pair of inwardly projecting lugs 13. These lugs straddle the keeper B and when the cover is down holds the keeper in the position shown in Figures 3, 5 and 7, there being a slight tendency of the magnetic field to cause rotation of the keeper. This is prevented by this engagement of the keeper with the lugs on the cover.

Referring now to the plug, it will be noted that the plug contains a core piece C comprising arms C C C joined-by a central back piece as indicated and having associated with them a secondary coil C in communication with the wires A Projecting from the face of the core piece C at a point removed from the center thereof is a pin C This pin is adapted to penetrate a hole C in the keeper B The device is put into operation by lifting up the cover, then inserting the plug. When the plug is inserted with the lug A in the slot A the pin C penetrates the hole C, then when the plug is rotated through 90 to'bring the lug A into engagement with the notch A the eccentric pin C engaging the hole C causes the keeper to rotate into the position it is shown assuming in Figure 2. That is a position wherein the keeper is out of contact with members B and B and in contact only with the pole piece 13 I then have an arrangement of parts such as is shown in Figure 2 with the pole pieces B C B C and B C abutting one another, the keeper 13 forming for the time in this connection a part of the pole piece B Under these circumstances the device opcrates just as any other transformer and transformed current passes through the wires A being generated by the exciting eifect of the transformer field on the secondary coil. The cover engaging the notch in the plug furnishes an additional means for locking the plug against rotation and withdrawal.

It will be obvious that the relation be tween .the primary and secondary coils may be anything desired, the transformer may be a step down or step up transformer as the case may be. It may be desirable to use it to increase or decrease the voltage or to give substantially the same voltage.

I claim:

1. In an electric plug and socket, core elements and coils mountedin each and means for locking them removably together to maintain the core elements and coils in working relation to form an electric transformer, and means associated with the primary coil and operative only when the plug and socket are not locked together for closing a magnetic circuit through the core elements associated with such coil.

2. In an electric plug and socket, core elements and coils mounted in each and means for locking them removably together to maintain the core elements and coils in working relation to form an electric transformer, means associated with the primary coil and operative only when the plug and socket are not locked together for closing a magnetic circuit through the core elements associated with such coil, said means comprising a keeper pivotally mounted on the core elements and adapted to be rotated into and out of magnetic circuit closing position.

3. In an electric plug and socket, core elements and coils mounted in each and means for locking them removably together to maintain the core elements and coils in working relation to form an electric transformer, means associated with the primary coil for closinga magnetic circuit through thecore elements associated therewith, and means as sociated with the secondary coil and core elements for automatically displacing said first mentioned magnetic circuit closing means when the plug and socket are in working relation.

4. In an electric plug and socket, a coil and a core element comprising a plurality of pole pieces joined at one end and projecting forwardly in general parallelism with the axis of plug and socket respectively, and means for removably locking the plug and socket in'working relation with the pole pieces of one abutting and 'in line with the pole pieces of the other, and a keeper pivoted on one of the'pole pieces associated with one of the coils and mounted for rotation into and out of engagement with another pole piece associated therewith.

5. In an electric plug and socket, a coil and a core element comprising a plurality of pole pieces joined at one end and projecting forwardly in general parallelism with the axis of plug and socket respectively and means for removably locking the plug and socket in working relation with the pole pieces of one abutting and in line with the pole pieces of the other, a keeper pivoted on one of the pole pieces associated with one of the coils and mounted for rotation into and out of engagement with another pole piece associated therewith, and means associated with the other coil for engaging such keeper and rotating it out of engagement when the pole pieces except the one upon which it is pivoted when the plug and socket are in working relation. 6. In an electric plug and socket, a coil and a core element comprising a plurality of pole pieces joined at one end and projecting forwardly in general parallelism with the axis of plug and socket respectively, means for removably locking the plug, and socket in working relation with the pole pieces of one abutting and in line with the pole pieces of the other, a keeper pivoted on one of the pole pieces associated with one of the coils and mounted for rotation into and out of engagement with another pole piece associated therewith, and means associated with the other'coil for engaging such keeper and rotating it out of engagement with the pole pieces except the one upon which it is pivoted when the plug and socket are in working relation, the means for locking the plug and socket in working relation comprising a cam and latch operative only upon relative rotation of plug and socket.

7. A transformer comprising a ,primary and a secondary coil, a core associated with associated with a cam and notch and a member carrying them and slotted to permit initial entry of the lug and to require rotation of the lug with respect to the member before it engages with the notch in locked position, and a keeper mounted on one of the pole pieces adapted to. be engaged by the other and rotated as the pole pieces come into locked working relation to move the keeper into inoperative position.

9. A transformer comprising a primary coil and a secondary coil, a core associated with each comprising a plurality of pole pieces joined together at one end only, means for removably locking the pole pieces together in abutting relation to complete the magnetic circuit associated with the two coils, the

locking means comprising a lug associated with a cam and notch and a member carrying them and slotted to permit initial entry of the lug and to require rotation of the lug with respect to the member before it engages with the notch in locked position, the keeper being adapted to be rotated by relative rotation of the pole pieces into such position that it bridges the gap between the pole pieces when the two coils are separated.

10. A transformer connecter including a plug member and a socket member, a primary winding in the socket member, a secondary winding in the plug member, means for removably locking together said plug and said socket, means associated with the primary winding for closing the magnetic circuit therethrough when the plug is disconnected, said means being rendered ineffective for closing the magnetic circuit through the primary when said plug is applied to said socket.

Signed at Chicago, county of Cook and State of Illinois, this 8th day of January,

EMIL C. HELLWIG.

each comprising a plurality of pole pieces joined together at one end only, means for removably locking the pole pieces together in abutting relation to complete the magnetic circuit associated with the two coils, the locking means comprising a lug associated with a cam and notch and a member carrying them and slotted to permit initial entry of the lug and to require rotation of the lug with re-

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