US1727553A - Lifting magnet - Google Patents

Description

Sept- 1929- P. J. MCCULLOUGH LIFTING MAGNET Filed Jan. 15. 1927 Mum r01? Pu? MC 1/4401/5/1 ArmP/YEV Patented Sept. 10, 1929.

PATENT I )FF'i CE...

PAULJ'. MGCULLOUGHJDF ST. LOUIS, MISSOURI, ASSIGNOR TO SCULLIN STEEL 00., OF ST. LOUIS, MISSOURI, A CORPURATION OF DELAWARE.

LIFTING MAGNET.

Application filed January 15, 1927. Serial No. 161,287.

My invention relates to a lifting magnet, and has for its primary object to produce a magnet in which the magnetic coils may be efliciently and economically secured in place without the use of bolts. Another object of my invention is to provide a novel way of securing the pins associated with the lifting lugs, whereby the magnet is conveniently manipulated.

A still further object of my invention is to provide shoes adapted to be shrunk upon such magnet-s as they are used upon, and which, when they become worn, may be quickly and economically removed and replaced.

With theforegoing and other objects in view, the invention comprises the novel construction, combination and arrangement of parts hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown the preferred embodiment of the invention. However, it is to be understood that the invention comprehends changes, variations and modifications which come within the scope of the claims hereunto appended.

Fig; I is a top plan view, partly in section, of my improved lifting magnet.

Fig. II is a cross-sectional view of the same.

Fig. III is a side elevation, partly in section, of the same.

Fig. IV is an enlarged detail view of one of the lugs and pins whereby said magnet is lifted and manipulated.

Fig. V is an enlarged detail sectional view through a portion of one edge of my lifting magnet which is provided with a shoe.

Fig. VI is a detail view showing a modified form of securing in place parts of the magnet.

A designates the main body or core of my magnet, B the lifting lugs by which said 1nagnet is manipulated, C the magnet secured 0 within said magnetic core, D a non-magnetic annular plate for securing the magnet in position in the core A, E an annular peripheral shoe adapted to be shrunk upon the magnetic core at the outer and bottom edge, and F an inner annular shoe adapted to be shrunk upon the magnetic core at the inner and bottom edge of the plate I).

Near the lower or downward edge of the cavity which contains the magnet C in the magnet core A, I provide grooves l which eX tend inwardly into the magnetic core body. It will be noted by reference to Figs. II and III that similar grooves are formed in the portion designated A of the magnet core. Similar grooves are formed in the inner and outer edges, respectively, of the non-magnetic plate I). The purpose ofthese grooves is to provide a seat for Babbittmetal'Q, which is poured in around the edges between the non-magnetic plate D and the groove in the ma 'net core A, whereby said non-magnetic plate I) is firmly held in position, and this supports the magnet C. If the shoes E and F are employed, these shoes are shrunk onto the magnet core A after the non-magnetic plates D have been secured in position, as above described. When the shoes are employed, as is usual on the larger sized lifting magnets, they serve also to assist in maintaining the magnet G in position.

If the shoes E and F are not employed, as in the type illustrated in Fig. III, that is, the smaller type of lifting magnet, the lower groove in the edges of the non-magnetic plate D is cut as shown in Figs. III' and VI, whereby the Babbitt metal 2 forms a slight reinforcing dam, as shown at 3 in Figs. III and VI, thus tending to retain securely the nonmagnetic'plate D in position.

In Fig. IV I have illustrated the pin, and method of fastening the same, which I employ in the lifting lugs B. It will be noted that an opening is provided through the lifting lugs for the receipt of a pin 4. It will be noted that the opening in the righthand lug B IV) does not extend the samesize through the entire lug but: terminates in a smaller opening 5 so as to provide a seat for one end of the pin. In the lefthand lug B IV) an opening 6 is formed having a recess 7 therein.

The opening 6 and recess 7 are adapted to receive a bent plate 8. The diameter of the bent plate 8 is sufficient to permit it to be inserted in the openingG, after which it is hammered down flat, as shown in section lines in Fig. IV. WVhen so flattened out the plate 8 serves to restrain the pin 4: from being displaced from the openings in the lugs B. WVhen it is desired to remove the pin 4 a tool is inserted in the opening 5 and the pin is driven out, causing the plate 8 to be again bowed outwardly or possibly destroyed, and if a new pin is needed it is inserted in the openings in the lugs B and a new plate 8 inserted to retain said pin in position, as described.

After the magnet C has been placed in position in the magnet core and confined therein by the non-magnetic plate D and held in position either by the Babbitt metal 2 alone or the Babbitt metal and the shoes E and F, the insulating compound shown at G is poured in under heat and pressure, so that all of the interstices between the magnetic core and the magnet are filled with such insulating compound. lVhen the insulating compound has been poured in through the opening 9 in the core A the plug 10 is screwed into such opening, thereby sealing the same.

H designates the wires leading to the magnet C.

lVhen it is desired to remove the magnetic coil 0 from the core A in the structure illustrated in Fig. II, the shoes E and F are removed and then, preferably by a blow-torch. the Babbitt metal 2 is melted and permitted to run out, thus releasing the non-magnetic plate D which permits the magnetic coil C to be removed. It will be noted by Fig. I that the insulating compound G occupies a channel which bears the numeral 11 in Fig. I. It will be noted that this is merely a channel of sufiicient diameter to permit the insulating compound G to be freely forced into and around the magnetic coil C.

I claim:

1. In a device of the character described a core, a magnetic coil positioned in said core and insulated therefrom, a plate for retaining said magnetic coil in said core, and means for retaining said plate in position in said core, said means comprising substantially registering channels on said plate and the interior of said core and a relatively low melting point metal applied to said substantially registering channels whereby said plate is locked in position in said core.

2. In a device of the character described, a core, a magnetic coil positioned in said core and insulated therefrom, a plate for retaining said magnetic coil in said core, and means for retaining said plate in position in said core, said means comprising substantially registering channels on said plate and the interior of said core and metal applied to said substantially registering channels whereby said plate is locked in position in said core.

3. A lifting magnet comprisin in combiu I 1 nation, a body portion, a magnetic coll mounted therein, a plate for maintaining the coil PAUL J. McCULLOUGI-I.

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