US1334504A - Lifting-magnet - Google Patents

Description

F.- i. PARKER. LIFHNG MAGNET.

APPLICATION FILED HB. 24, i910. REM-:WED OCT. 8, l9l9. 1,334,504.

Patented Mar. 23, 1920.

2 SHEETSTSHEET I.

F. PARKER. umm; MAGNET. 1,334,504.

APPLICATION FILED FEB. 24. ISH). RENEWED OCT. B. |9|9| Patented Mar.2`3,1920.

2 SHEETS-SHEET 2.

M k@ 64.4.. ma?

is placed in the magnet frame it forms a part of the magnetic circuit, thus increasing the space efficiency. The tubular member (i performs two functions. It constitutes a support for the energizing winding and it forms a part of the magnetic circuit and of the inner pole piece of the ma net.

The winding 13 may be of any esred construction but preferably a winding is emplo ed of the general construction isclosed 1n atent No. 1,325,914, patented December 23, 1919. Briefiy described, such a winding is formed of a plurality of sections 14, each section comprisin a flat strip of conducting material wound at-wise into a spiral with a strip of insulating material inter osed between thv convolutions thereof. he sections are then b'uilt`u one upon another with suitable layers of insulating material 15, interposed between the same, and then the terminals of adjacent coils are connected to form one continuous winding.

With the structure illustrated, the wind-- ing may be initiall formed upon the tubu lar 'member 6. hen the winding is so formed, one or more layers of suitable insulating material 16 should first be placed around said tubular member, after which the conducting strips may be coiled thereon. In practice, to secure thorough insulation of the winding, it is desirable to flange the ends 'of the insulation placed on the tubular member so that the saine will be overlapped by the layers of insulation placed over the outside of the winding. In order to prevent bulging of the outside layers of insulation by theV fianged ends of the insulation 16, I preferably` reduce the width of the inner turns of the top and bottom sections of the winding to accommodate said ianged ends. This enables the plate 7 to be placed closely against the upper side of the winding, thereby avoiding any waste space. One of the advantages of making the plate 7 detachable is to give access to the upper side iof'the Winding for inspection, repairs, etc., without necessitating the removal of said winding from the tubular member (i. The

Winding, the tubular member 6 and the' plate 7, in effect, .form a unitary structure which, when the magnet frame is inverted, maybe readily inserted into and withdrawn from the same. 0f course, in practice, the winding support may be of other constructions and still form a part of the magnet frame.

The winding and its support may be secured in the magnet frame in any preferred manner. In practice, howewer, I prefer to place on the underside of the wirftlinp; an annular non-magnetic protecting or cover plate 18 and to.I provide removable pole shoes. 19 and 20 for retaining the win( ing support and protecting plate 13 in place. These pole shoes are made of magnetic material and thus form a part of the magnetic circuit. They project some distance below the winding so as to take the blows from the attracted material. Such material will in variably strike the ole shoes first, and thus the cover plate an winding are protected. The pole shoes being removable may be easily replaced when they become worn. This structure provides ample protection for the winding without decreasing the lifting power of the magnet. It is more specifically described and claimed in Patent No. 1,325,914, hereinbefore referred to. The outer pole piece 3 of the magnet frame and tubular n'iember 6 are preferably provided with annular recesses 21 and 22, respectively which furnish shoulders for supporting the protecting plate 18 to prevent the same from unduly pressing against the winding and to prevent slipping thereof. The inner pole shoe 19 is arranged to overlap both the tubular member 6 and the protecting plate 1 and is preferably retained in place by means of bolts 23, passing through the inner pole. At its outer eriphcry the protecting )late is preferab y provided with an annui-ar flange 24, the end of which is adapted torest upon the outer pole shoe 20. VThe outer pole shoe 20 may be secured to the magnet frame in any desired manner by means of through bolts 25. IVth this arrangement the pole shoes 19 and 2O may be readily removed, thereby permitting the withdrawal of the cover plate 18 and winding Asupport from the magnet frame. In practice, it is desirable to render the winding moisture proof and to this end I preferably insert suitable annular packings 27, 28 and 29 in the joints between the protecting plate 18. the magnet frame and the tubular member Any desired material may be employed i'or these packings.

Upon the plate 7 I secure a terminal block 30 arranged to project into an opening 31 in the magnet frame. This terminal block may be of any desired construction, but, in practice, I prefer to construct the same in theI manner illustrated in Fi r. 5. As illustrated, the block 30 comprises a ase 32 and a top plate 33. The base 32 is provided with recesses 34 and'35 arranged to` receive the ends of the leads 41 and 42 from the energizing winding, the leads being preferably reflexed therein as illustrated in Fig. 1. The top plate 33 carries suitable. binding posts 31' and 37 arranged to project into the recesses 34 and 35 and to be con nected to the leads 41 and 42. F or retaining the terminal block in place, I rivet to the plate 7 notches base 32.

3!) provided at the corners of the These studs holds the base 32 against any laterali-or longitudinal movemen The studs are tapped to receive fastening screws 4,0. passing through the top four studs 38 arranged to fi-t into plate \Vith this arrangement, when the top plate is secured to thestuds 38, it tirml y holds the base 32 in position.

The binding posts 36 and 37 are arranged to be connected by suitable conducting stri s 43 to binding posts 44 and 45 respective secured to the magnet frame. The bindmg posts 44 and 45 may be of any preferred construction. These binding posts are preferably insulated from the magnet frame by means of suitable insulating sleeves 46 and insulating disks` 47 and are connected to the supply leads 48.

For giving access to the inner ends of the binding posts 44 and 45 and to the terminal block 30, I provide the magnet frame with a removable plate 49 which may be held in place by screws or any other suitable means. A packing 49 is preferably' inserted between the plate 49 and the magnet frame to form an air tight joint. Upon removal of this late, the binding posts of' the terminal olock 30 and the binding posts carried by` the magnet frame may be connected and disconnected at will while the energizing winding is in place ir. the magnet frame. Also upon removal of plate 49 the top of the terminal block 3() may be withdrawn to give access to the ends of the leads 41 and 42 from the winding 13. It will thus be seen that by reexing the ends of the leads 41 and 42 in the terminal block, the plate cari-ying the binding posts 36 and 37 may be withdrawn through the opening in the 4magnet frame to enable inspection or renewal of the connections between said leads and said binding posts.

Magnets of this type are often very roughly handled with thel result that the connections between the supply leads and the exterior bindingf" osts become loosened, or the supply leads ecome injured. To more fully protect the supply leads, I preferably incase the same in a metallically reinforced tube or sleeve 50, and, to prevent undue strain on the connections 'between said leads and the binding posts, I preferably clamp the protecting tube 50 against the magnet frame. To `this end, I provide on the removable plate 49 a raised portion 51 having a curved recess 52 therein for receiving the protecting tube 50 of the supply terminals, and then place over said tube a clamping member 53 having screws 54 passing therethrough and fitting into the plate 49, as best illustrated in Figs. 2, 3 and 4.

It will thus be seen that this clamping arrangement eiiectuallv prevents any strain being exer'ted upon the connections between the leads 48 and their binding posts. To facilitate the connections of the leads to their binding posts` it. is desirable to have the ends thereof extend beyond the end of `the protecting casing 50, and I, therefore,

prefer to provide means for protecting the exposed ends of th. se. leads. To thisl end l preferably provide the clamping member 5&5 with a downwardly curved estension 55 ada ted to form a protecting plate t'or said lea s. The extension 55 is provided at' its end with an angularly disposed portion adapted to be clamped to the magnet frame by means of bolts 56. To still further protect the outside terminal structure, I prefcr ably rovide the magnet frame on opposite sldcs thereof with upwardly extending flanges :37 and 58 which, in practice, I prefer to have project slightly above the clamping member 53. The flanges 57 rand 58 cooperate with the extension on the clamping p ate 53 to completely inclose the binding posts 44 and 45 and the ends of the leads 4S, thus insuring thorough protection thereof. The clamping plate 53, however, may be renioved at any time to give access to the binding posts 47 and 48.

l`n my Patent No. 1,270,969, granted July 2, 1918, I have disclosed a simplified method or process of sealing the energizing winding with a suitable protecting matorral, using the magnet frame as the sealing receptacle. To carry out this method or process, it is necessary that the magnet frame be rendered substantially air tight, that suitable openings be provided in the same to permit the withdrawal o1 air and the insertion of protecting material, and that suitable passages or spaces be provided between the magnet frame and the winding for insuring withdrawal of air from all parts of the frame and a thorough distribution of the sealing materia] over the winding. The packings heretofore described render the magnet frame illustrated sutiicicntly air tight for carrying out my process of sealing. I have found, in practice, that with the structure illustrated a thorough distribution of the sealing material may be obtained byproviding in the magnet frame two or more channels or grooves 59 and coincident notches 60 in the outer periphery of the plate 7 as illustrated in dotted lilies Fig. 1. As many oi these grooves may be provided as desired. but. in practice. I have found that two are suliicient. In case only two grooves are used, I prefer to space these grooves approximately degrees from the recessed portion of the magnet frame which accon'nnodates the leads 41 and 42 of the winding and which, in effect, forms a third channel or groove for facilitating the distribution of the sealing material. In'practice, I rovide the magnet frame with two openings (il shown in dotted lines, each of which com`|uunicates with one of the grooves 59. The openings 6 1 Vwhile not so shown are in practice preferably screw threaded to receive suiv able screw threaded plugs or tllelike. In brief` the process of sealing is as follows: .\u` air pump is connected to `one lso of the openings 61, while the `other opening is connected to a receptacle containing the sealin material in a liquid form, a suit-able va ve being interposed between the magnet trame and said receptacle. The supply of sealing material is first shut olf and then the Ypump operated to create a vacuum within the magnet frame. After this the valve controlling the supply of sealing material is opened, whereupon the sealing material is drawn into the magnet trame and thoroughly distributed over the Winding and into any crevices therein. The inflow of scaling material is continued until the magnet frame is full, or substantially full, whereupon the pump is caused to operate to compress the sealin material in the Jframe. Further details of t le process of sealing` are disclosed in my Patent No. 1,270,969, granted July 2, 1918, above mentioned.

It is to be understood that thc structure shown is for purposes of illustration only and that variations may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Having thus described my invention` what 1 claim as new and desire to secure by Letters Patent, is

1. A liftingr magnet having a 'trame provided with an inner pole surrounded by an outer pole, a remo *able member ot magnetic material surrounding the inner pole and formingr part of the magnetic circuit. and an energizing winding' carried by said removable member.

2. A lifting magnet having a trame provided with an inner pole surrounded by an outer pole with an annular recess between said poles, a removable tubular member of magnetic material surrounding the inner pole and in magnetic contact therewith, and an energizing winding carried by said niember and arranged in said recess.

3. A lifting magnet having a frame provided with an inner pole piece surrounded by au outer .pole piece, a removable tubular member ot' magnetic material surroumlingr the inner pole` piece and in magnetic contact therewith, an energizing winding carried by said member. and a` removable, pole shoe ot' magnetic material on the inner pole piece adapted to hold said member and winding in position.

4. A lifting magnet having a trame pro vided with an inner pole )ieee surrounded by an outer polc piece wit an annular recess between said pole pieces, a removable tubular member ot' magnetic material sur rounding thil inner pole piece and in mag netic contact therewith` sa id member carrying an energizing` winding adapted to be positioned in Isaid recess, a non-magnetic plate covering said recess, and removable pole shoes of magnetic material on the outer faces of said pole pieces adapted to support said plate and said member.

5. A lifting magnet having a frame provided with an inner and an outer pole piece with a winding space between the same, a tubular ma etic member removably mount` ed on the inner pole piece, an energizing Windingcarried by said tubular member, removable covering plates for said Winding at opposite ends of said tubular member, and removable pole shoes of magnetic material on the outer faces of said pole pieces, said sboesbeing adapted to hold said tubular member and one of said plates in position.

6. A lifting magnet having a frame provided with an inner and an outer pole piece with an annular Winding space between the same, removable pole shoes of magnetic ma.- terial on the outer faces of said pole pieces, a removable tubular magnetic member surrounding said inner pole piece and forming a part of the magnetic circuit and carrying an energizing winding arranged in said recess, said pole shoes being adapted to support said member and Winding in said recess.

7. A lifting magnet having a frame provided with a continuous recess in one face thereof, an energizing winding arranged in said recess, a magnetic member upon which said winding is wound, said member being removabl)7 mounted in said frame and forming a part of the magnetic circuit thereof, and removable pole shoes of magnetic material for said frame adapted to hold said member and winding in place.

8. A lifting magnet having a frame provided with an inner pole piece surrounded by an annular outer pole piece, a tubular magnetic member removably mounted on said inner pole piece and forming a portion of the magnetic circuit thereof, said member having an energizing winding Wound thereabout adapted to fit in the recess between said pole pieces and removable pole shoes of magnetic material on the outer faces of said pole pieces adapted to hold the member and winding in place.

9. A lifting magnet having a. circular frame. a tubular magnetic member removably mounted within said frame, an energizing winding removable with said tubular member. a plate secured to one end of said tubular member, and a pin carried by said plate and arranged to fit into a recess 1n said frame to prevent turning` ot' said tubular member.

10. A lifting magnet having a frame provided With inner and outer poles with a winding space between the same, a tubular magnetic member removably mounted on said inner pole and in magnetic contact therewith, an energizing winding coiled around said tubular member, and covering plates for said Windingr at opposite ends of .said tubular member, the plate at the inner end of said tubular member being secured thereto for supporting said winding in inverted position ot said magnet frame and both of said plates being removable from said tubular member to give access to said winding from opposite sides thereof.

11. A lifting magnet having a frame, an energizing winding for said frame, a magnetic member upon which said winding is wound, said member forming a portion of the magnetic circuit of said magnet and being adapted to be inserted in and withdrawn from said frame` and removable pole shoes for said magnet frame adapted to hold said member and said winding in place.

12. A lifting magnet having a circular frame provided with an annular outer pole, a circular member arranged to fit within said frame and having a cylindrical magnetic portion projecting from the center thereof forming a portion of the magnetic circuit of the magnet, a winding' coiled around the cvlindrical portion of said niembei'` and means for securing said member and said winding in said magnet frame.

1?. A lifting magnet having a circular frame provided with an annular outer pole piece, a circular member arranged to fit within said frame and having a magnetic cylindrical portion projecting from the center thereof forming a portion of the magnetic circuit of said magnet, a winding coiled around the cylindrical portion of said member, an anniilai protecting plate adapted to be placed over the exposed side of said winding` and reiiovablc pole shoes foi` retaining the removrble parts in place in said frame.

14. A lifting magnet having a circular frame provided with annular inner and outer pole pieces, a` circular plate arranged to fit within the annular recess between the pole pieces and having a tubular magnetic member fitting over the inner pole piece and forming a portion of the magnetic circuit thereof. a winding mounted on said tubular member, an annular protecting plate arranged to close the annular recess in the magnet frame after the winding luis been placed therein, and removable pole shoes for securing said protecting plate and said winding in place in .said magnet frame.

l5. A lifting magnet having a circular frame provided with annular inner and outer pole pieces. fitting into the recess between said pole pieces, a tubular magnetic 'member arranged to lit over the inner pole piece and adapted to form a portion of the magnetic circuit of said magnet, Isaid plate being secured to said tubular member, a winding coiled around said tubulai member, and a removaybli pole shoe covering the outer faces of `,ucr pole piece and arranged to engage Wilp port said tubular member.

a removable annular plateI 16. A lifting magnet having a circular frame provided with outer pole pieces, a removable annular plate fitting into the recess between said pole pieces, a tubular magnetic member arranged to litover the inner pole piece and forming a portion ot' the magnetic circuit thereof, said plate being secured to said tubular member, a winding coiled around said tubular member, an annular nonmagnetic protecting plate covering the exposed side of said winding, and removable pole shoesof magnetic material coverin the outer faces of the inner and outer po o pieces and a1"- raiiged to retain the removable parts in positi'on.

17. A lifting magnet having a frame, an energizing winding therefor, a removable member within said frame arranged to carry said winding, a terminal block carried by said removable member and connected to the terminals of said windinfr, binding posts carried by said frame and extending into the same in proximity with said terminal block, anda removable plate on said frame for givingaccess to the inner ends of said binding posts and said terminal block.

18. A lifting magnet having a frame, a winding Within said frame, binding posts on said magnet frame and connected to said winding, supply binding posts, and a removable rotecting plate arranged to cover said bin mg posts and to clamp said supply leads against said magnet frame.

19. A lifting magnet having a, frame provided with a removable portion, an energizing winding carried by said removable portion, a terminal device carried b said removable portion and connected to t e terminals of lsaid winding, and a removable member on said frame for giving access to said terminal device.

20. A lifting magnet having a frame, an energizing `Winding, a removable member within said frame and arranrred to carry said winding, a terminal bloc( detachably secured to said removable member, relexed conductors connecting said terminal block to the terminals of said winding, and a removable plate ou said magnet frame for giving' access to said terminal block and for permitting the withdrawal thereof without withdra wing said removable member.

21. lifting magnet having a frame, a winding within said frame, terminals on the outside of said frame, insulated supply leads connected to said terminals, and a protecting plate for said terminals detachably secured to said frame and arranged to clamp said leads against said frame.

22. A lifting magnet provided with a circular frame having annular inner and outer poles, a Winding arranged Within said frame between said poles, a protecting plate for annular inner and v leads connected to said closing the opening between said poles, and aekings between said plate und said poles '0r rendering the joints between the same Substantially nir tight, Said frame having a. I :nlurnlityl of radial grooves on the inside thereof, certain of said grooves communieating with openings thro-ugh said freine.

23. A lifting magnet having a, frame provided with a circuler pole, a winding coiled around said pole, an insulating sleeve interposed between sed winding and said pole, Said sleeve having its end flanged, n layer of insulation arranged on seid windin and overlappin the flanged portion o said sleeve, sai winding being formed with an annular pocket for receiving the flange of said sleeve whereby said layer of insulation will lie flat against said windin 24. A lifting magnet having a graine provided with a circular pole, a winding formed of a at strip of conducting material wound llatwise around said pole, an insulating sleeve interposed between said pole and said winding, said sleeve having at its end a flanged portion, a sheet of insulating muterinl arranged on one eide of said winding and overlappingl the {langed portion of Said sleeve,y :mid winding having its inner turns of reduced width to form un annular groove to receive the flanged portion of Suid sleeve whereby Suid Sheet of insulating material will lie flut against Suid winding.

A lifting magnet having u circular freine, u removable ring of magnetic mate-- rial mounted within Said frame I(ind forniing n portion of the magnetic circuit of Said magnet, un energizing winding carried by and removable with seid ring, and n circular plate arranged on one eide of said Winding and detlelmbly secured to said ring, Said ring projecting through n Central opening in seid plate so that the efficiency of the mngnotie rireuit ie not impaired by Said plate.

ln witness whereof I lmve hereunto subseribed my naine in the presence of two wit ness'es. 4

FRANK l. PARKER. \"\'itnesee$:

vFRANK il. l-lUnAnn, C. W'. iVUesow.

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