US2285274A - Magnetizing apparatus - Google Patents

Description

hm 1942- A. N. HANSON Emu. 2,285,274

' nan-rum Arrmrus Filed Jan. 1;, 1940 Patented June 2, 1942 MAGNETIZIN G APPARATUS Arvid N. Hanson,

Hinsdale, and Stanley F.

Warner, Forest Park, Ill., assignors to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application January 11, 1940, Serial No. 313,374-

7 Claims.

This invention relates to magnetizing apparatus and more particularly to apparatus for insuring that permanent magnets being magnetized are held in association with the magnetizing coils for a sufiicient length of time to properly magnetize them.

It is an object of the present invention to provide and improve magnetizing apparatus for properly magnetizing permanent magnets.

In accordance with one embodiment of the inventlon, magnetizing coils are positioned beneath a table on which there is a suitable guideway for receiving and directing relays having permanent magnets in them which are to be magnetized and guiding them into the proper position with respect to the magnetizing coils. A stop member is positioned in the guideway to prevent movement of the relays out of the magnetizing position untilthe magnetizing coil cores are properly saturated magnetically. The stop member is connected by means of a link and lever mechanism with a block of magnetic material, which is adapted to be attracted by the magnetizing coils when the magnetic field thereof reaches its maximum flux density and resilient means are provided for normally holding the stop member in position to prevent movement of the relay.

A better understanding of the invention will be had by reference to the following detailed description when considered in conjunction with the accompanying drawing, wherein Fig. 1 is a plan view of a. magnetizing apparatus embodying the present invention;

Fig. 2 is a vertical sectional view taken along the line 2-2 of Fig. 1 in the direction of the arrows showing some of the details of construction, and

Fig. 3 is an enlarged detail sectional view taken on the line 33 of Fig. 1 in the direction of the arrows showing a control switch for controlling the flow of current to the magnetizing coils.

Referring to the drawing, wherein like reference characters designate the same parts throughout the several views, the apparatus is mounted in a bench or table 5 to the underside of which a pair of magnetizing coils 6 and I are secured by means of brackets 8 and 8, respectively. The magnetizing coils 6 and l are provided with core members l and H, respectively, which extend upwardly to the table and have suitably attached to them pole pieces I2 and |3, respectively. A pair of wires l4 and I5 are connected to a suitable source of current supply and supply the energizing current to the coils relay 2| shown in dot and dash lines in Figs. 1 i

and 2 into the proper position between the pole pieces I2 and I3. The relay 2| comprises a framework 22 in which there are mounted the usual fixed contacts 23 and 24 and a movable contact 25. As is usual in relays of this type.

there is provided a horseshoe magnet 26, which is to be magnetized in the apparatus described herein. The guideway is of such dimensions as to conform closely to the outside dimensions of the framework 22 and permit the passage of the relay through it. The guideway 20 has a rectangular cut-out formed in the base thereof and in direct vertical alignment with the cutout 3|) is a rectangular cutout 3| in the table 5. Positioned in a pocket 32 in the table are a'pair of contacts 33 and 34, which serve to complete a circuit between leads 35 and 36 for controlling the flow of energizing current through the wires I4 and I5 to the magnetizing coils 6 and I. The contact 34 has a block of insulating material 31 mounted on it and adapted to be moved by the framework 22 of a relay 2| when the relay is positioned between the pole pieces l2 and H. The upper surface of the block 31 slopes upwardly slightly so that as the relay 2| is pushed into position between the pole pieces l2 and II from right to left (Fig. 1) the framework 22 of the relay will depress the block 31 and move contact spring 34 into engagement with contact spring 33, thereby to supply current to the magnetizing coils 6 and Fixed to the upper'surface of the table 5 is a guideblock having an aperture 4C therein in which a rod 41 is slidably mounted. The rod 41 has a block 48 of magnetic material fixed to one end of it and is pivotally connected through a link 49 to a lever 50, which is, in turn, pivotally mounted at 5| on the upper surface of the table 5. The lever 50 has a coil spring 52 connected to it and to the table 5, normally to urge the lever 50 about its pivot 5| in a counter-clockwise d|- rection. to hold the block 48 against the guide block 45. Fixed to'the left end (Fig. 1) ofthe lever 50 is a rod 53 which has pivoted a't its other end a stop member 54.- A guide member 55 has an aperture 56 formed in it for receiving the stop member 54 and guiding it through the side wall of the guideway 20 and into the path of a relay 2|. The stop member 54, when in the position shown, will be in the path of a relay 2| being slid through the magnetizing apparatus in the guideway 20 and will position the horseshoe magnet 26 of the relay in the proper place between the pole pieces l2 and [3 until the magnetizer pole pieces 12 and I 3 are properly saturated magnetically. The strength of the coil spring 52 ,is' such that the block 48 of magnetic materialwill not be attracted to the pole piece l2 of the magnetizing apparatus until the pole pieces and i3 are magnetically saturated, and when' the magnetizing apparatus reaches the saturation point, the magnetic flux will overcome the tension of spring 52 and the block 48 will be attracted toward the pole piece l2, thereby to rock thelever 50 about its pivot point and pull the stop member 54 out of the path of the relay 2!.

In the operation of the device, polarized relays 2I, having horseshoe shaped members of magnetic material in them, may be pushed through-the guideway 20 from right to left (Fig.

1') to magnetize the horseshoe shaped members.-'

When the framework 22 of the relay 2 I ,in its passage through the guideway 20, strikes the block 31, the block 31 will be moved downwardly to close a circuit between the contacts 34 and 33 and supply energizing current to the magnetizing coils 6 and I. 'Shortly after the circuit has been completed between contacts 33 and 34, the

for directing relays past the pole pieces and through said area, a stop member positioned adjacent the pole pieces for preventing movement through the guideway of the relay whose permanently magnetizable portion is to be mag netized, a resilient means for normally holding said stop member in the path of the relay whose magnetizable portion is ,to' be magnetized, a member ofmagnetic material positionedadjacent one of the pole pieces of the magnetizing apparatus and adapted to be attracted thereby, and a link and lever mechanism interconnecting the stop member and the member ofmagnetic material.

'3. A magnetizing apparatus for magnetizing permanently magnetizable articles comprising a magnetizing unit having pole pieces to concentrate the magnetic flux in a predetermined area,

a guideway for directing articlesgpast the pole pieces and through said area, a stop member positioned adjacent the pole piece for preventing movement through the guideway ofan article to be magnetized, a resilientmeans for normally holding said stop member in the path of the article to be magnetized, a member of mag- "netic 'material positioned adjacent one of the framework 22 will strike the stop member 54,1

thereby to prevent further movement of the relay 2| until the pole pieces l2 and I 3 aresatur rated magnetically at which time the magnetic flux of the magnetizing apparatus will attract the block .48 to pull the stop member-E4 "out of the path of the relay 21 and the relay 2| may then be pushed to the left through the guideway' to complete the magnetization of the horseshoe shaped magnet 26. It will be noted that the block 31 .will not move upwardly until the v relay has passed over it to carry the magnet 26' through the magnetic field set up between the pole pieces l2 and I3, and therefore the greatest nu); concentration of the horseshoe magnet 26 will be adjacent its open ends.

Although a specific; embodiment-of the inbe limited only urated, a resilient means for normally holding said stop member in the path of the article to j be magnetized, a member of magnetic material so positioned adjacent one of the pole pieces of the magnetizing apparatuses to be attracted thereby only when the magnetizable articlebecomes saturated, and a link and lever mechanism interconnecting. the stop member and the member. of magnetic material.

2; A magnetizing apparatus for, imparting magnetism to the permanently magnetizable 'portion of a relay comprising a magnetizing unit having pole pieces to concentrate the magneticflux in a predetermined area, a guideway pole pieces of the magnetizing apparatus and adapted to be attracted thereby, a link and a lever mechanism interconnecting the stop member and the member of magnetic material, and a switch positioned in said guideway to be. actuated by an artic e being magnetized for controlling the supply of current to the magnetizing unit.

4. A magnetizing apparatus for magnetizing permanently magnetizable article comprising a magnetizing unit having pole pieces to concentrate the magnetic flux in a predetermined area, a guidewayfor directing articles past the pole pieces .and through said area, a stop member positioned adjacent the pole pieces for preventing movement through the guideway of an article to be magnetized, a resilient means for normally holding said stop member in the path of the article to be magnetized, a memberof mag? netic material positioned adjacent oneof the,

pole pieces of the magnetizing apparatus and adapted to be attracted thereby when the magnetizing unit is. magnetically saturated,' a link and a lever mechanism interconnecting the stop member and the member of magnetic material. and a switch positioned in said guidewayto be actuated by an article being magnetized for controlling the supply of current to the magnetizing unit, said switch being adapted to maintain the current supply to the magnetizing unit while the stop member prevents movement of: the article and for a short time thereafter;

51 In a magnetizing apparatus, magnetizing coils for imparting magnetism to a permanently magnetizable member, a. stopmember for normally stopping said member to be magnetized in a'predetermined position until said magnetizable member is magnetically saturated, and a magnetic member so shaped and so located in the held of the magnetizing coils;as to be'm'oved by saidfield only when the magnetizablemember has become saturated, the magnetic member being connected to the-stop member for automatically moving said stop-memberout of its stopping position by movement of the magnetic member resulting from saturation oil the magnetizable member.

6. In a. magnetizing apparatus for magnetically saturating permanently magnetizable articles,

a pair of magnetizing coils having pole pieces for concentrating magnetizing flux "adjacent an article being permanently magnetized,a stop member positioned to locate an article between said pole pieces, a block of magnetic material movably positioned adjacent one of said pole pieces so shaped and so positioned as to be moved by the magnetic field of said one pole piece only when the article being magnetized is saturated magnetically, and means interconnecting the block of magnetic material and stop member whereby movement of the block in one direction under the influence of the magnetizing coils will cause the stop member to move out of the path of the article.

'7. In a magnetizing apparatus for magnetizing permanently magnetizable magnetic members, a pair of magnetizing coils having pole pieces for concentrating the magnetizing flux from the coils in a predetermined area to impart magnetism to a permanently magnetizable, member in said area, a guideway for guiding said magnetizable member in its passage through said area, a switch actuated by the magnetizable member in said area for controlling the supply of current to said coils, a stop member for normally blocking move ment of the article through said area in the guideway until said magnetizable member is magnetically saturated, and a magnetic member so shaped and so located in the field 01' the ma netizing coils as to be moved by said field only when the magnetizable member has become saturated, the magnetic member being connected to the stop member for automatically moving the stop member out of the path of the article by movement of the magnetic member resulting from saturation of the magnetizable member.

ARVID N. HANSON. STANLEY F. WARNER.

Images