US 1382181 A
Description (OCR text may contain errors)
J. H. EMERY.
APPucATlo'N man FEB. 17. 192|.
m6111611 June 21, 1921.
2 SHEETSJ-SHEET l.'
INVENTOR ATTORNEYS JamesffEme/'g Bv @www mmmw J. H. EMEHY.
APPLICATloN FILED FEB.17.1921.
Patented June 21, 1921.
2 SHEETS-SHEET 2.
' T5192. JIL
illlll ummllnllulllllnnn INVENTOR ATTORNEYS STATES JAMES H. EMERY, 0F NEW YORK, N. Y.
Specification of Letters Patent.
Patented June 21, 1921i.
Application filed February 17, 1921. Serial No. 445,868.
To aZZ whom t 'may concern Be it known that l, JAMES H. EMERY, a citizen of the United States, residing at lnwood Park, county of Queens, city and State of New -York, have invented a new and useful improvement in Gyrating-Machines, of which the following is a specification.
This invention relates to gyrating machines, that is to machines for imparting a spherically centrifugal or gyratory motion to a carrier, and more particularly to such machines which are suitable for use in the production of hollow castings.
ln the' production of certain types of hollow castings a hollow mold is partially lled with thermoplastic material and the mold is then given such motion as to cause the contained fluid to spread over the surface of the mold. 1t vthe mold were merely spinned about a single axis the material would accumulate in an equatorial belt, none being present at the poles. It is therefore necessary, in order to produce an. even distribution of the thermoplastic material within the mold, to impart thereto a movement of rotation about a plurality of non-parallel axes, that is a gyratory movement.
The principal object of the invention is therefore to` provide means for imparting to a carrier a movement of rotation about more than a single axis. In accomplishing this object there are provided means for revolving a carrier in an orbit and for rotating the carrier about an axis not perpendicular to the orbit.
More specifically the present invention contemplates the provision of a rotatable shaft having a cranlror eccentric portion, a rod supported by such crank or eccentric portion, a carrier rotatably mounted on the rod and means responsive to the rotation of the crank shaft for rotating the carrier about the rod as an axis while the resulting movement imparted to the rod revolves the carrierv through an orbit.
In the drawings illustrating one preferred embodiment of the invention, Figure 1 is a vertical .section taken on the line 1-1 of Fig. 2, showing a machine made in accordance with this invention; Fig. 2 is a vertical section taken on the line 2--2 of Fig. .1; and Fig. 3 is a sectional view similar to Fig. 2, showing a modification.
In these drawings there is shown .a frame comprising base members 4 arranged to form a rectangle having uprights 5 located at* the corners thereof, the uprights `being Joined at their upper ends by horizontal frame members 6 and 7. Conveniently located on the members 6 are two bearings 8 within which is journaled a shaft having aA crank or eccentric portion previously referred to, and here shown as a crank shaft 9 having an'offset or crank portion 10. For convenience in assembling the machine the shaft 9 is most desirably made in two parts united by a suitable coupling 11. A rod 12 is rigidly secured in any desired manner, as by the T-joint 13 to a sleeve 14, which is rotatably mounted upon the crank 10. A carrier 15, here shown as a disk, is rotatably secured in any desired manner as by a pin 16 to the upper end of the rod 12. Any suitable means may be provided to secure the object to be gyrated to the carrier, there being provided in the present embodiment a yoke 17 rigidly secured as by the T-joint 18 to the rod 12, having secured to its upper end the downwardly depending tube 19. As clearly shown in Fig. 3, the tube 19 is threaded to receive the hub 24 of a wheel 20. A rod 21 fits snugly within the tube 19 and carries at its lower end a circular plate 22 to which is secured a sheet 23 of wood or other suitable material. Coiled about the rod 21 and coniined between the plate 22 and the hub 24 of the wheel 2O is avspiral compression spring 25. rllhus when an object to be gyrated, such for example as a mold 27, is set on the carrier 15 the wheel 2() may be turned down to compress the spring 25 which in turn forces the plate 22 and the sheet 23 into engagement with the upper surface of the mold 27 so that' the mold is securely held in place on the carrier while there is no danger of crushing the mold as might happen if non-yieldable means were employed to secure the mold to the carrier. l/Vhen it is desired to remove the mold from the carrier the wheel 20 is unscrewed, the sheet 23 is lifted-and the mold is then easily removable.
1n order to prevent the greater weight carried by the rod 12 above the crank 1`O from overbalancing the relatively light rod 12,` the lower end of this rod is confined as by being pivotally connected to one end of a link 28, the other end of which is pivoted to a fixed support 29, which may be rigidly secured to a cross-arm 30 carried by adjacentA uprights 5, or which might besecured to one of the bottom frame members 4.
rlFhe machinemay be operated by the rotation of the shaft 9 by hand, or mechanical means may be provided for supplying the necessary power. There is here shown a pulley 31 rigidly secured to one end of the shaft 9 which may be driven by a belt 32 passing over a pulley 33, which is rotated by the operation of a motor 34. The motor is most conveniently located upon a shelf 35 suitably supported upon adjacent uprights 5. j
From a consideration of Fig. 1, which shows in solid lines the position of the mechanism when the crank 10 is in its lowermost position and which shows in dotted lines the position of the mechanism when the crank is in vits extreme right and left hand positions, it will be obvious that rotation of the shaft 9 will revolve the carrier 15 through a relatively elliptical orbit, as indicated by the broken line 36.
The revolution of the carrier 15 in the orbit just described causes centrifugal forces tending to Vconcentrate -the Huid contained within the mold 27 in an equatorial belt which'lies at right angles to the plane of the drawing in Figs. 2 and 3. In order to produce centrifugal forces in a different plane so that the result of the combined forces will spread the material evenly over the surface of the mold, it is necessary to rotate the carrier about some axis which forms an angle other than a right angle with the plane of the orbit. The most eiicient results will be produced when the second axis of rotation lies in the plane of the orbit and in the present embodiment this axis coincides with the center of the pin 16 and the rod 12. In order to cause the carrier to rotate about its pin 16 there may be provided, as shown in Fig. 2, a pinion 37 rigidly secured to the crank 10 and constantly in mesh with a spur gear 38. The gear 38 is journaled on an axle 39, which is rigidly secured to the rod 12 in any desired manner, as by an extension of the T-joint 18. On the underside of the carrier 15 there is provided a circular rack 40 which is const-antly in mesh with the gear 38. Thus when the shaft 9 is rotatedin a counter-clockwise dil rection, as indicated by the arrow in Fig. 1, the pinion 37, being rigidly secured to the crank 10, will itself make one revolution in a counter-clockwise direction for each revolution o f the crank, thus causing the spur gear 38 to rotatein a clockwise direction a fraction of a turn, depending upon the ratio between the two gears. The gear 38 transmits this motion to the rack 40, thereby causing the carrier 15 to rotate aboutits pin 16,v in a clockwise direction as viewed fromV above. The arrangement shown in Figs. 1
and 2, while satisfactory under certain conditions, and simple in construction, is not the most economical in operation since the teeth of the gear 38, due to engaging `a circular rack, will wear away rapidly. Moreover, this arrangement does not provide for easy variation in the relative speeds of rotation of the Shaft 9 and carrier 15.
A better arrangement is that shown in Fig. 3, in which a spur gear 41 and a bevel gear 42 detachably mounted on the same hub 43 are substituted for the gear 38 and a circular bevel rack 44 is substituted for the spur rack 40, thereby avoiding excessive wear on the gear teeth. y Moreover, this arrangement permits variation in the relative speeds of rotation of the carrier 15 and the shaft 9 by the simple method of replacing the spur gears 37 and 41 with other gears having a diiferent reduction ratio.
Obviously friction rolls may be substituted for the gears 37 and 38, shown in Fig. 2, and a frictional surface for the rack 40 if desired. Moreover, the lower end of the rod 12 may be mounted on a cross-head which rides between vertical guide bars instead of being pivoted to the link 28. The eccentricity of the orbit 36 may also be decreased by increasing the length of the link 28, or this orbit may be made circular by providing diametrically opposed rollers on the periphery of the carrier 15 together with a circular track of proper dimensions to guide their movement. In this case, the portion of the rod 12 below the joint 13 would be left free or might be dispensed with entirely. Many other changes of details and dimensions might be readily suggested without necessitating a departure from the spirit of this invention.
Having thus fully described the invention, what is claimed is:
1. A gyrating machine comprising a carrier, means for revolving said carrier in an orbit and means for rotating said carrier on an axis making an angle other than a rightanglewith said orbit.
2. A'gyrating machine comprising a car rier, means for revolving said carrier in an orbit and means responsive to the operation of said revolving means for rotating said carier on an axis lying in the plane of said or it.A
3. A gyrating machine comprising a rod,
end of said rod, means for revolving an intermedi-ate portion of said rod in an orbit and means responsive to such revolution for rotating said carrier on saidrod.
5. In a gyrating machine the combination with a frame, a crank shaft rotatably mounted on said frame, a rod, means journaled on the crank ortion of said shaft for supporting said rodi a link pivoted to said frame and to an end of said rod to restrict the movement thereof, a carrier rotatably mounted on the other end of said rod, a source of ower, means for operatively connecting said source of power to said crank shaft to rotate the same, and whereby said carrier is revolved in an orbit and means responsive to such rotation for rotating said carrier.
6. A gyrating machine comprising a crank shaft, means for supporting the crank shaft for rotation about one aXis, a carrier, and means journaled upon the offset portion of the crank shaft for supporting the carrier, said carrier being journaled for rotation about its supporting means.
7. A gyrating machine `comprising a crank shaft, means for supporting the crank shaft for rotation about one axis, a carrier, and means journaled upon the offset portion of the crank shaft for supporting the carrier, said carrier being journaled for rotation about its supporting means, and means responsive to the rotation of the crank shaft for rotating the carrier on its axis. f
8. In a gyrating machine the combination with a frame, a crank shaft rotatably mounted thereon, a rod supported by the crank portion of said shaft, a carrier rotatably mounted on one end of said rod, means for retaining the other end of said rod below said crank shaft, a pinion fixed tc said crank portion,'a circular rack mounted on said carrier and a gear mechanism coperating with said pinion and said rack to rotate said carrier in response torotation of said crank shaft.
9. In a gyrating machine the combination with a frame, a crank shaft rotatably mounted thereon, a rod supported by the crank portion of said shaft, a carrier rotatably mounted on one end of said rod, meanslfor restricting the movement of the other end of said rod, a pinion fixed to said crank portion, a circular beveled rackmounted on said carrier, a bevel-gear rotatably supported by said rod and in mesh with said rack and a spur gear mounted for rotation with said,bevelgear and constantly in mesh with ysaid pinion whereby said carrier is rotated in response to rotation of said crank shaft.
10,. In a gyrating machine the combination with means for maintaining orbital motion in a plane, of means responsive to the aforesaid means for maintaininga rotary motion about an axis other than a normal to said plane.
l1. In a gyrating machine the combination with means for maintaining orbital motion in a. plane, .of means responsive to the aforesaid means for maintaining a rotary motion about an axis other than a normal to said plane, and means for oscillating the axis.
l2. In a gyrating machine the combination with a'carrier, means for revolving said carrier in an orbit, means for rotating said carrier on an aXis other than a normal to `the plane of said orbit, and means for securing to said carrier an object to be gyrated.
13. In a gyrating machine the combination with a carrier, means for revolving said carrier in an orbit, means for rotating said carrier on an axis other than a normal to the plane of said orbit, and yieldable means for securing to said carrier an object to be gyra-ted.
14. In a gyrating machine the combination with a carrier, means for revolving said carrier in an orbit, means for rotating said carrier on an aXis other than a normal to the plane of said orbit, means for secu1' ing to said carrier an object to be gyrated, and means for maintaining said object above said carrier at all times during the operation of the machine.
15. In a gyrating machine the combination with a carrier, means for revolving said carrier in an orbit, -means for rotating said `carrier on an aXis other than a normal to the plane of said orbit and an ad]ustable