US2285861A - Mining machine - Google Patents

Description

June 9, 1942. R. K. JEFFREY ETAL MINING MACHINE Original Filed May 6, 1938 2 Sheets-Sheet l byway-rams ROBERT K JEFFREY,

AND LEWIS E MITCHELL DccsAsegg ATT Y.

RICHARD D. NICHOLS, Amlmswmog June 9, 1942. R. K. JEFFREY ET AL 2,285,861

MINING MACHINE Original Filed May 6, 1958 2 Sheets-Sheet 2 ROBERT K. Jcrmng AND LEWIS E. M|TcHELL,Dzcmen,B RICHARD D. NICHOLS, ADMINISTRATOR) BYMM 7 77742441,

ATT Y Patented June 9, 1942 UNITED STATES PATENT OFFICE MINING MACHINE Original application May 6, 1938, Serial No.

266,448, now Patent No. 2,263,779, dated November 25, 1941.

Divided and this application November 4, 1940, Serial No. 364,323

5 Claims.

This invention relates to a mining machine and particularly to the construction of an electric motor thereof which drives the mining mechanism, such as a kerf cutting mechanism.

An object of the invention is to provide an improved motor construction which is of the totally enclosed type and particularly to provide improved means for cooling such a motor.

A further object of the invention is to provide a motor structure which cooperates to form an integral part of a supplementary frame.

Still another object of the invention is to provide improved mechanism for adjusting the supplemental frame, including a motor casing or housing, to adjust a mining mechanism, such as a kerf cutter.

Other objects of the invention will appear hereinafter, the novel features and combinations being set. forth in the appended claims.

This application is a division of our application Serial No. 206,448, filed May 6, 1938, for an Improvement in mining machines, which matured into Patent No. 2,263,779, Nov. 25, 1941.

In the accompanying drawings,

1 is a diagrammatic plan view showing a mining machine incorporating the structure of our invention;

Fig. 2 is an enlarged plan view showing the central portion of the mining machine of Fig. 1;

Fig. 3 is a sectional plan view through the electric motor forming part of the invention herein claimed; and

Fig. 4 is a transverse sectional elevational view of an elevating hydraulic piston motor taken on the line 4-4 of Fig. 2 looking in the direction of the arrows.

In Fig. l of the drawings, there is illustrated diagrammatically a mining machine which incorporates the features of our invention herein claimed. The mining machine is disclosed in full detail in our parent application above identified, of which this application is a division, and so no attempt will be made to describe it in detail except as to details forming the subject matter herein claimed.

Said mining machine includes a truck 45 which supports a turntable 'II upon which is mounted for adjustment in a vertical plane a supplemental frame I65 which has a forwardly extending neck m9 carrying a turnover head mechanism I59 which provides for various adjustments of kerf cutting mechanism I50.

Extending rearwardly from and supported by the truck 45 is a platform 545 which carries a considerable amount of mechanism which per se is not pertinent to the invention herein claimed.

The turntable II is mounted upon the truck &5 for swinging movement in a horizontal plane or about an upright axis (see Fig. 2). Said turntable II (Fig. 2) is formed by a top plate 12 which has attached at its center a casting or pedestal and carries at its periphery a large race I6 which cooperates with a plurality of balls 11 and an outside large race I8 carried by the top plate 15 of the truck 45 to form an anti-friction mounting for said turntable II upon said truck 15. The outer peripheral edge of the top plate I2 is provided with a downwardly extending flange 99 adapted to protect the bearing members and to prevent entrance of dirt to the bearing surfaces.

It is to be noted that the balls TI are held in shearing relation between the races 16 and I8 and thus prevent both upward and downward movement of the turntable II with respect to the truck 45 while providing an anti-friction pivotal connection between them for relative movement about; a vertical or upright axis. The bearing area provided by the large number of balls I1 is sufficient to provide for this particular type of mounting.

To provide for the swinging movement of the turntable II about its upright axis with respect to the truck 45, we provide a pair of hydraulic piston motors 82 and 33 which are fully disclosed in our parent case, above identified.

As disclosed completely in said parent application, the two hydraulic piston motors 82 and 83 are always operated together and in reverse directions so that a very powerful and equalizing force will be transmitted to the turntable II to swing it.

As best seen in Figs. 1, 2 and 4 of the drawings, there is mounted upon the turntable 'II for movement about a horizontal axis a supplementary frame I66 formed by a rigid motor casing IBI within which is housed an electric motor for driving the kerf cutting mechanism I60. Adjacent its rear bottom portion the motor casing I III is provided with side journal bearings I02, I02 which pivotally support said supplementary frame I06 upon a pair of horizontally positioned stub shafts 963, I63 (see Fig. 2), which are rigidly supported upon brackets IM, I94 and removably attached thereto by clamp screws I05, I55; brackets I94, I64 being formed integral with the top plate I2 of turntable II. As shown in Fig. 3 the casing IUI may be an enclosing field frame of a flame proof motor with the journal bearings E02, I62 at the rear end sides of the motor itself.

As clearly seen by reference to Figs. 1 and 2 of the drawings, the supplementary frame I also includes a gear casing I06, the rear end of which is bolted to the front end of the motor casing IN by bolts or Screws I01. The gear casing I06 is also provided with a removable cover plate I08. Said supplementary frame I00 further includes a downwardly sloping elongated neck I09, which is formed integral with the gear casing I06.

To provide for the adjustment of the supplementary frame I00 with respect to the turntable 1I about the horizontal axis provided by the stub shafts I03, I03 there is provided adjacent each side thereof an arm IIO, one end of which is journaled to the outer end of the stub shaft I03, as clearly seen in Fig. 2 of the drawings, and is pivotally attached to said stub shaft I03 by bolt and washer means II I. The forward end of each arm H0 is bolted to the gear casing I06 by bolts or screws I I2.

Positioned between each of the arms H0 and the motor casing IOI is a pivotal hydraulic piston type motor II3. Said motors II3 are substantially of identical construction and one of them is shown in detail in Fig. 4 of the drawings to which attention is now directed. Said motor II3 comprises a cylinder II4 provided with pivot trunnions H5 and H6. The trunnion I I5 is journaled in an appropriate journal bearing in arm IIO which journal bearing is provided with a grease fitting H1 and trunnion H5 is journaled in an appropriate journal bearing carried by stub. cylinder II8 formed rigid with a vertical side wall of the motor casing IOI, best seen in Fig. 4.

Within the cylinder IE4 is a sleeve 212 which is held rigidly in place between end gaskets by removable head 213 attached to cylinder II4 by screws 21 4. Within the sleeve 212 is a piston 215 provided with a piston ring 216 and a felt packing ring 211 held in place by a removable bronze cap 218 which is attached to the piston 215 by screws 219. Rigidly attached to the piston 215 is a piston rod 280 the lower end of which is recessed at 28I to receive a pivotally attached bearing knuckle 282 which rides on a bearing cup 283. Knuckle 282 and cup 283 have contacting spherical bearing surfaces and said knuckle is pivotally attached to the lower recessed end of piston rod 230 by transversely extending pin 284. The knuckle 282 is permanently attached to the top plate 12 of turntable H, as by welding, or it may be screw threadedly attached thereto.

To provide for lubrication of the spherical bearing surfaces between knuckle 282 and bearing cup 283 said knuckle 202 is provided with a bore 285 which communicates with a bore 286 in top plate 12 with which is associated a grease fitting 281.

The head 213 is provided with a packing ring 288 which cooperates with the piston rod 280 to provide an oil-tight sliding seal.

The piston motors I I3 are of the double acting type and thus inlet ports 289 and 290 are provided adjacent the piston rod end and the head end, respectively, of the cylinder II4 so that the supplementary frame I00 can be moved positively about the horizontal pivotal axes provided by stub shafts I03 in either direction.

Attention is now directed to Figs. 2, 3 and 4 and to the structure of the electric motor carried by the supplementary frame I00 and particularly to the cooling means for said electric motor. Within the motor casing or housing IOI there is provided an armature I2I mounted for rotation in spaced bearings I22 and I23, the former of which is carried by the front wall I24 of said casing IOI and the latter of which is carried by the rear wall I25 thereof. The armature IZI also includes a shaft I25 to which is keyed a drive pinion I21.

Adjacent its rear end the armature shaft I26 carries a centrifugal fan rotor I28 which rotates in an opening I29 in a partition wall I39. The opening I29 provides an inlet for the fan rotor I28, the outlet for which is provided by a pair of spaced ports I3I in the upright side walls of the casing IOI. The ports I3I lead to cooling passageways outside the motor casing IOI provided by longitudinally extending U-shaped plates I32 which provide air cooling passageways from the rear end of the motor casing IOI to the front end thereof.

Adjacent the front end of said motor casing l0! there is provided a plurality of inlet ports 233 which provide a return path for the cooled air from the cooling passageways to the interior of the motor casing IOI. It is thus evident that the fan rotor I20 will operate to circulate air over two continuous paths, drawing the air from within the motor casing NH and circulating it through cooling passageways outside said motor casing IOI as provided by the plates I32 and then returning the cooled air to said motor casing I0l.

It is additionally to be noted that the rear wall IE5 is provided with a plurality of cooling vanes or ribs I33 which aid in dissipating the heat of the motor.

It is also to be noted by particular reference to Fig. 4 of the drawings, that the plates I32 perform the additional function of acting as bracing supports for the stub cylinders I I8.

In addition to those elements previously de scribed, it may be mentioned that the electric driving motor within the casing IEBI also includes field structure I34, field coils I35 and commutator I35 which has associated with it the usual brushes, which are not illustrated in the interest of clearness but which are supported by brush supports I31. In this connection it is also to be noted that the partition wall I30 not only acts to direct the inner air to the fan rotor I28 but also acts as a support or base for the brush supports I31.

It is evident that as the armature IZI rotates, fan rotor I28 operates to draw air across the heat developing coils in armature I2I as well as field coils I35 and the commutator I36. This warm air is then thrown laterally through the two openings I3I and will of course impinge against the plate I25 which will dissipate heat particularly through the ribs I33 as well as by virtue of its direct contact with atmosphere. The warm air flowing through openings I3I, I3I passes forwardly through the conduits formed by plates I32, I32, which conduits will dissipate a considerable amount of the heat from the flowing air whereupon the cooler air will be returned to the interior of motor casing I01 through inlet ports 233.

It is thus seen that this electric motor is of the totally enclosed type. The function of this electric motor is solely that of driving the kerf cutting mechanism I60 of the mining machine so that this driving is entirely independent of any other operating functions thereof. The kerf cutting mechanism I60 is universally adjustable as is disclosed in full detail in our parent application above identified, and one of the adjustments Which is of importance is provided by virtue of the supplementary frame Hill, of which the motor casing or housing It?! forms an integral part, the gear housing I05 and integral neck I99 also forming a part thereof and being rigidly attached to motor housing NH as above described.

Furthermore, as above described, this supple" mentary frame I E16 is adjustable about a horizontal axis about the rear end thereof provided by the stub shafts I53, i053 and cooperating mechanism by which said supplementary frame let! is pivoted to the turntable H for adjustment on a horizontal axis. This vertical swinging movement of the supplementary frame lei! is provided by the two hydraulic piston motors H3 described in detail above.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims ereto appended, and we therefore wish not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of our invention, what we desire to secure by Letters Patent of the United States is:

1. In a mining apparatus, a totally enclosed electric motor comprising an enclosing frame, rotary motor mechanism in said frame, longitudinally extending U-shaped plates secured to opposite sides of said frame to provide external air cooling passageways, air inlet and outlet ports leading from said frame interior to said passageways and from said passageways to said frame interior, and pivot bearing means extending laterally from said frame through said passageways and reinforced by being secured to said plates.

2. In a mining apparatus, an enclosed electric motor comprising an enclosing frame, rotary motor mechanism in said frame, mechanism affording an external air cooling passageway, air inlet and outlet ports leading from the frame interior to said passageway and from the latter to the frame interior, and pivot bearing means extending laterally from said frame and reinforced by being secured to the aforesaid mechanism.

3. In a mining apparatus, an enclosed electric motor comprising a rotor and an enclosing housing therefor, a partition extending across said housing and having an opening therein, a fan rotor associated with said opening for forcing air therethrough to secure circulation of air over said rotor, heat radiating means comprising air passageways extending along said housing and communicating with the interior of said housing to provide a circulatory path for air operated on by said fan rotor, and bearing means for said motor housing reinforced by being secured to,

said heat radiating means.

l. In a mining apparatus, an enclosed electric motor comprising a rotor and an enclosing housing therefor, a transverse partition adjacent one end of said motor housing and having an opening therein, a fan rotor associated with said opening and driven by said rotor to circulate air through said housing over said rotor and through said opening, mechanism extending longitudinally along the outside of said housing to afford a passageway for such circulated air, and pivot bearlaterally from said housing ing means extending through said passageway and reinforced by being secured to the aforesaid mechanism.

5. In a mining apparatus, an enclosed electric motor comprising an enclosing frame, a rotor in said frame, air circulating fan means driven by said rotor, mechanism providing an air cooling passageway outside said enclosing frame, air inlet and outlet ports leading from the frame interior to said passageway and from the latter back to the frame interior through which passageway air is forced by said fan means through said frame interior, and pivot bearing means extending laterally from said frame and reinforced by being secured to the aforesaid mechanism.

ROBERT K. JEFFREY. RICHARD D. NICHOLS, Administrator of the Estate of Lewis E. Mitchell,

Deceased.

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