US1761224A - Sand cutter - Google Patents

Description

June 3, 19-30.

w. E. NAYLOR SAND CUTTER Filed Dec. 4. 192.6 2 Sheets-Sheet l W. E. NAYLOR June 3, 1930.

SAND CUTTER 2 Sheets-Sheet 2 Filed Dec. '4. 1926 Patented June 3, 1930 UNITED STATES PATENT; OFFICE WALTER ERVIN NAYLOR, or CHICAGO, rumors, ASSIGNOR. 'ro' THE BEARDSLEY &

PIPER COMPANY, or CHICAGO, ILLINOIS, a. CORPORATION or ILLINOIS (SAND CUTTER Application filed December 4, 1926. Serial 1%.,152548.

The invention relates to sand cuttersof the type used in foundries in conditioning sand for moulding.

In the use of cylinders for cutting or throwing moulding sand, it is desirable to pro- Vide a construction which is housed to exclude sand from the driving means. It is also desirable to provide a construction in which the number of elements used to drive the cylinder is reduced to the minimum. One object of the invention is to provide a construction in which an electric motorfor driving the cylinder'is located within and enclosed by thecylinder, so that sand will be effectively excluded from the motor. Another object of the invention is to provide a sand cutter of the cylinder type in which the cylinder is directly driven by an electric motor, so that gearing for driving the cylinder from a motor may be dispensedwith. This object is attained primarily by fixing the fields of the electric motor in the cylinder and providing a stationary armature supported on the shaft around which the cylinder rotates. Other objects of the invention will appear from the detail description.

The invention consists in the several novel features hereinafter set forth and more particularly defined by claimsat the conclusion hereof. I

In the drawings: Fig. 1 is a transverse section of a machine embodying the invention. Fig. 2 is a side-elevation. Fig. 3 is a longitudinal section. Fig.4 is a detail of the body of the cylinder or drum. Fig. 5 is a plan, parts being omitted;

The invention is exemplified in a sand" cutter of the wheel-cart type which may be moved around to discharge the sand whereever desired and comprises a pair of carrying-wheels 10 which support and are rotatable on a shaft 11; a frame or structure comprising side-brackets 12, through which the shaft 11 extends, and in which the shaft'is fixed against rotation, and a pair of tubular handles 13 which are clamped in the brackets 12 respectively and by which the operator may move the machine to the desired point of operation; legs l l'secured to the handles; a receptacle or hopper 15 secured to and discharging the sand from the hopper for the purpose of disintegrating and distributing it. The cylinder comprises sand-throwing elements and a hollow cylindrical drum or cast body 16 on which the elements are secured. .At either end, the body 16 is removably secured, by bolts 17, to heads 18 which close the ends of, and support, the cylinder. Said heads are carried by roller bearings 19 around the shaft 11 and rotatably support the cylinder so that the latter may rotate around said shaft. The inner ring 19 of each of said bearings is held by nuts 19" which are threaded to the shaft 11. Gaps 20, removably, secured by bolts 21 to the heads 18, enclose the outer ends of bearings 19 and each has a gasket 22 fitting around shaft 11 to prevent sand from entering the bearings. This exemplifies a cylinder which is rotatable about a stationary shaft or axle and has its ends and its bearings completely enclosed to prevent the entry of. sand into the cylinder. The cylinder is directly driven by an electriomotor which is disposed inside of, and

enclosed by, the body of the cylinder, so that gearing will be dispensed with. \The electric motor is of the induction type and comprises armature windings25 and laminated fields 26 of usual construction. The armature is fixedly wound on and carried by the shaft 11,

supported by brackets 12; and a cylinder for which is fixed against rotation relatively to the brackets 12, so that the armature windings will be non-rotatable. The fields 26,

around the armature windings 25, are fixedly secured in the cylinder-body 16. Preferably, the fields are secured together and pressed ordriven into an inner cylindrical peripheral portion 27 or body-16 and against an annular shoulder 28 so they will be fixed to the eylinderand so that the flow of current through the armature will rotate the fields and drive the cylinder. A cable of conductors 29, for supplying current to the armature 25, leads therefrom through a radial opening 30 which leads to a longitudinal passage 31 in the shaft 11. Said passage xtends to one end of said shaft. A socket 32 is secured by a screw 32 to said end of the shaft. The wires 29 are connected to, and terminate at, contact-strips 32 which are insulated from one another and secured in socket 32. The latter is adapted to detachably receive a suitable connection-plug which is suitably connected to a source of current. This exemplifies a construction in which the electric motor for driving the cylinder is mounted inside of, and enclosed within, the cylinder; which dispenses with gearing be tween the motor and the cylinder; in which the fields of the motor are secured directly in the cylinder body to drive the cylinder, and in which the conductors enter the cylinder through the stationary motor-shaft.

In practice, it is desirable to provide sandthrowing elements which are durable, will not become broken, and may be easily replaced when worn out. It frequently occurs that pieces of scrap or castings are present in the sand and shovelled into the hopper 15, which, when rigid teeth or points are used for projecting the sand, are caught by the teeth and projected with great force thereby, resulting in breaking or damaging the teeth or damage caused by the projected castings. To provide the cylinder with throwing elements which will meet these desiderata, the invention provides elements which consist of a series of loops or ring-like elements 34, the outer arcuate portions of which engage the sand and are yieldable. For the convenience of producing and conjointly applying said elements, they are formed of the loops or convolutions of a length of'a coil of wire 35. The coil is spirally wound around the outer periphery of the cylinderbody 16 which is formed with a spiral concave seat 36 for the inside of the coil. This coil is secured to the cylinder-body and in the groove 36 by a steel cable 37 which is threaded through the coil and has its ends anchored to bolts 39 which pass through lugs 38 integrally formed on the outer periphery of the cylinder-body 16 and adjacent its ends respectively. The outer ends of said bolts have nuts 40 whereby the cable may be drawn taut to secure the inner portions of the convolutions of the coil firmly 1n the groove 36, leaving the opposite or outer portions of the convolutions free to flex circumferentially of the cylinder.

To house the end windings of the coil 35, and lugs 38, rings 42 are secured to the cylinder-body by the bolts 17 which secure the heads 18 and body together. Each ring 42 extends outwardly beyond the coil and longitudinally inward where it terminates in a ange 43 which is adapted to prevent the sand from flowing endwise out of the hopper 15. Upon removal of the rings 42, the anchorages for the cable will be accessible so that the coil may be removed and replaced when desired. This exemplifies throwing or projecting a cylinder having its periphery provided with yieldable loops for engaging the sand. Thus formed, the elements are durable and avoid damage which results from the forcible projection of castings and the like which are in the sand. It also emplifies a construction of this type of throwing elements, in which the entire series may be applied as a unit and conveniently secured to the cylinder-body.

The hopper 15 comprises inclined walls 15" and sides 15 which are preferably iiared upwardly, so that sand may be shovelled into the hopper with facility, and a front wall 15. At that endof the hopper from which the sand is to be discharged, a transverse bar 44 is secured b bolts 48 to brackets 12, and a bar 45 extents across bar 44 and is secured thereto by bolts 47. These bars have vertically extending recesses 49 to receive and hold between them a series of coil springs 46 which have free lower ends terminating adjacent the elements 34, to prevent an excess of sand from being discharged by the throwing elements and to coact with said elements in disintegrating the sand. The upper ends of springs 46 are removably clamped between bars 44 and 45 by bolts 47.

The operation will be as follows: Sand will be shovelled or otherwise delivered into the hopper 15. 'When current is supplied to the electric motor in the cylinder, the latter will be rapidly rotated so the outer portions of the elements 34 will throw sand from the bottom of the hopper onto, and distribute it over, the floor to cut the sand. Springs 46 will retard the sand in the hopper to prevent an excess from being discharged by the throwing elements.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a sand cutter, the combination of a frame, a shaft non-rotatably held in the frame, a hollow cylinder provided with sand throwing means, and journalled on said shaft, a hopper for delivering sand to the cylinder, and an electric motor for driving thecylinder, comprising an armature on the shaft and fields fixedly secured to the inner periphery of the cylinder, and conductors for the motor extending through one end of the shaft. 7

2. In a sand cutter, the combination of a frame provided with wheels, a shaft non-rotatably held in the frame, and on which the wheels are mounted, a hollow cylinder provided with sand throwing means, j ournalled on the shaft, a hopper for delivering sand to the cylinder, and an electric motor for driving the cylinder, comprising an armature on the shaft and fields fixedly secured to the inner periphery of the cylinder, and electrical conductors for the motor extending through one end of the shaft.

3. In a sand cutter, the combination of a rotatable cylinder comprising a hollow body, and sand throwing means on the body, driving means inside the cylinder, a shaft for the cylinder, a frame in which the shaft is supported, and removable heads secured to the body, rotatably supporting the cylinder on the shaft.

4. In a sand cutter, the combination of a frame provided with wheels, a shaft nonrotatably held in the frame, a rotatable cylinder provided with sand throwing means, comprising removable heads journalled on the shaft, a hopper for delivering sand to the cylinder, an electric motor for driving the cylinder disposed inside thereof, and electrical conductors for the motor extending through one end of the shaft.

5. In a sand cutter, the combination of a frame, a hollow cylinder rotatably supported by the frame, sand cutting means connected to and operated by drive of the cylinder, and an electric motor for driving the cylinder housed completely within said cylinder.

6. In a sand cutter, the combination of a frame, a hollow cylinder rotatably supported by the frame, sand cutting means connected to and operated by "drive of the cylinder, and an electric motor housed completely within the cylinder for driving the latter, said motor comprising a rotor fixed to the cylinder.

7. In a sand cutter, the combination of a I frame, a hollow cylinder rotatably support ed by the frame, sand cutting means con-' nected to and operated by drive of the cylinder, a hopper carried by the frame and positioned to deliver sand to the cutting means, and an electric motor for driving the cylinder housed completely within said cylinder.

8. In a sand cutter, the combination of a wheeled frame, a hollow cylinder rotatably supported by the frame, sand cutting means connected to and operated by drive of the cylinder, and an electric motor for driving the cylinder housed completely within said cylinder.

9. In a sand cutter, the combination of a wheel provided with carrying wheels, a hollow cylinder rotatably mounted in the frame and positioned concentrically with respect to the wheels, means for delivering sand to the cylinder, sand cutting means on'the cylinder operated by drive of the latter, and a motor for driving the cylinder housed completely therein.

10. In a sand .cutter, the combination of a frame having a non-rotatable shaft associated therewith, a hollow cylinder rotatably supported by the frame, sand cutting means connected to and operated by drive of the cylinder, and a motor completely housed an armature stationarily mounted on the shaft and rotatable fields fixed to the inner periphery of the cylinder.

12. In a sand cutter, the combination of a frame, a shaft non-rotatably mounted in the frame and provided with carrying wheels at the ends thereof, a hollow cylinder journalled on the shaft between said wheels, sand cutting means connected to and operated by drive of the cylinder, a hopper for delivering sand to the cutting means, and an electric motor housed completely within the cylinder 7 for driving the latter.

13. In a sand cutter, the combination of a frame, a shaft non-rotatably mounted in the frame and provided with carrying wheels at the ends thereof, a hollow cylinder journalled on the shaft between said wheels, sand cut ting means connected to and operated by drive of the cylinder, a hopper for delivering sand tothe cutting means, and an electric motor housed completely within the cylinderfor driving the latter, said motor comprising an armature fixed to the shaft and rotatable fields fixed to the inner periphery of the cylinder.

Signed at Chicago, Illinois, this 19th day of November, 1926. g I IVALTER ERVIN NAYLOR.

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