Patent US3754852A successfully refreshed from Google Patents.
US3754852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for rotational casting
Assignee: REMPEL ROTO-CAST CORP
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Filing: 1965-08-24
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Granted: 1973-08-28
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Expires: 1985-08-24
Abstract
Abstract This invention relates to improved apparatus for rotational casting in hollow molds and a method of operating the same; more particularly, this invention relates to apparatus in which liquid materials are solidified or powdered materials are fused to a solid material while being rotated to distribute the material over an inside mold wall surface and to a method of supply and/or removing heat from the molds during such casting operations.
Inventors
- 👤 D Rempel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:16
CPC Classifications
B; B29; B29C; B29C33/00; B29C41/00; B29C41/02; B29C41/04; B29C41/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
378 words
A machine adapted to cast hollow articles rotationally comprising a mold having a hollow cavity and a passage through the mold for heat-transfer fluid to vary the temperature of the mold cavity surface, a spindle assembly upon which said mold is mounted, a frame, inlet and outlet fluid conduit means in said frame, a pair of axially aligned bearings carried by said frame, on which bearings said spindle assembly is mounted, means, including a rotary seal at each of said spindle bearings, for conducting fluid from said inlet conduit means substantially concentrically through one of said spindle bearings to said mold passage and from said mold passage substantially concentrically through the other of said spindle bearings to said outlet fluid conduit means, bearing means in which said frame is rotatably mounted, means for supporting said frame bearing means, means to rotate said frame and said spindle assembly in their respective bearings, said frame bearing means being supported so that an extension of its axis lies within and intersects the solid of revolution generated by said mold when said frame and spindle means are simultaneously rotated, means, including rotary seals, for connecting said inlet and outlet conduit means to a reservoir of heat-transfer fluid, whereby heat-transfer fluid may be circulated through said mold passage to vary the temperature of said mold cavity while said mold is capable of being simultaneously rotated about two diverse axes, and in which means to rotate said spindle assembly and frame include a motor mounted on said frame and connected to said spindle, and commutator means carried by said frame whereby said spindle motor may be controlled to rotate said spindle assembly independently of the rotation of said frame, and in which at least one of the structures (frame or spindle assembly) supported on a bearing is supported by a hollow stub shaft journaled in such bearing and the tube passing through said bearing for conducting heattransfer fluid to said inlet and outlet conduit means in said frame is spaced from said stub shaft to insulate said tube from said shaft and minimize the conduction of heat between the heattransfer fluid in said tube and said bearing and the structural elements of said machine mechanically connected with said bearing and the shaft journaled therein.
Claim 2
Dependent Claim
378 words
A machine adapted to cast hollow articles rotationally comprising a mold having a hollow cavity and a passage through the mold for heat-transfer fluid to vary the temperature of the mold cavity surface, a spindle assembly upon which said mold is mounted, a frame, inlet and outlet fluid conduit means in said frame, a pair of axially aligned bearings carried by said frame, on which bearings said spindle assembly is mounted, means, including a rotary seal at each of said spindle bearings, for conducting fluid from said inlet conduit means substantially concentrically through one of said spindle bearings to said mold passage and from said mold passage substantially concentrically through the other of said spindle bearings to said outlet fluid conduit means, bearing means in which said frame is rotatably mounted, means for supporting said frame bearing means, means to rotate said frame and said spindle assembly in their respective bearings, said frame bearing means being supported so that an extension of its axis lies within and intersects the solid of revolution generated by said mold when said frame and spindle means are simultaneously rotated, means, including rotary seals, for connecting said inlet and outlet conduit means to a reservoir of heat-transfer fluid, whereby heat-transfer fluid may be circulated through said mold passage to vary the temperature of said mold cavity while said mold is capable of being simultaneously rotated about two diverse axes, and in which means to rotate said spindle assembly and frame include a motor mounted on said frame and connected to said spindle, and commutator means carried by said frame whereby said spindle motor may be controlled to rotate said spindle assembly independently of the rotation of said frame, and in which at least one of the structures (frame or spindle assembly) supported on a bearing is supported by a hollow stub shaft journaled in such bearing and the tube passing through said bearing for conducting heattransfer fluid to said inlet and outlet conduit means in said frame is spaced from said stub shaft to insulate said tube from said shaft and minimize the conduction of heat between the heattransfer fluid in said tube and said bearing and the structural elements of said machine mechanically connected with said bearing and the shaft journaled therein.
Claim 3
Dependent Claim
165 words
In a spindle assembly for a machine of the class described, means for supporting a jacketed mold through which heat-transfer fluid passes to vary the temperature of the mold and for conducting said fluid to and from said mold, tubing connecting said means to inlet and outlet openings in said mold, and means in such spindle assembly to control the flow of fluid to said mold and tHereby control the rate of heat transfer between said mold and said fluid, including means for supporting a multi-sectional jacketed mold, the mass of whose sections are different and which sections define different areas of a mold cavity enclosed by said mold and also including a distributing assembly for distributing heat-transfer fluid through tubing connected therewith to and from the jacket of each of said mold sections, and said flow control means controls the flow of heat-transfer fluid to said mold sections to provide a substantially uniform rate of heat-transfer per unit of area of mold cavity surface.
Claim 4
Dependent Claim
165 words
In a spindle assembly for a machine of the class described, means for supporting a jacketed mold through which heat-transfer fluid passes to vary the temperature of the mold and for conducting said fluid to and from said mold, tubing connecting said means to inlet and outlet openings in said mold, and means in such spindle assembly to control the flow of fluid to said mold and tHereby control the rate of heat transfer between said mold and said fluid, including means for supporting a multi-sectional jacketed mold, the mass of whose sections are different and which sections define different areas of a mold cavity enclosed by said mold and also including a distributing assembly for distributing heat-transfer fluid through tubing connected therewith to and from the jacket of each of said mold sections, and said flow control means controls the flow of heat-transfer fluid to said mold sections to provide a substantially uniform rate of heat-transfer per unit of area of mold cavity surface.
Claim 5
Dependent Claim
38 words
In a spindle assembly as defined in claim 2 in which said distributing assembly is spaced from said mold supporting assembly to insulate and minimize the conduction of heat from said heat-transfer fluid to said mold supporting means.
Claim 6
Dependent Claim
161 words
In association with a rotational casting machine of the class described, a reservoir system for recirculating heat-transfer liquid through such a machine, including pumping means for forcing heat-transfer liquid into said machine and withdrawing the same from said machine for return to said reservoir system, a hot tank maintaining said liquid at at least the hottest temperature at which said liquid is circulated through said machine and a cool tank maintaining said liquid at no more than the coolest temperature at which said liquid is transferred through the machine, means providing for the circulation of the liquid at intermediate temperatures through said machine, and valving means allowing the withdrawal of liquid from said hot tank into said circulated liquid when it is desired to raise the temperature of the liquid circulated through said machine and to allow the withdrawal of liquid from said cool tank into said circulated liquid when it is desired to lower the temperature of said circulated liquid.
Claim 7
Dependent Claim
161 words
In association with a rotational casting machine of the class described, a reservoir system for recirculating heat-transfer liquid through such a machine, including pumping means for forcing heat-transfer liquid into said machine and withdrawing the same from said machine for return to said reservoir system, a hot tank maintaining said liquid at at least the hottest temperature at which said liquid is circulated through said machine and a cool tank maintaining said liquid at no more than the coolest temperature at which said liquid is transferred through the machine, means providing for the circulation of the liquid at intermediate temperatures through said machine, and valving means allowing the withdrawal of liquid from said hot tank into said circulated liquid when it is desired to raise the temperature of the liquid circulated through said machine and to allow the withdrawal of liquid from said cool tank into said circulated liquid when it is desired to lower the temperature of said circulated liquid.
Claim 8
Dependent Claim
167 words
In a system as defined in claim 4 in which said means allowing circulation of the liquid at intermediate temperatures includes an intermediate tank for receiving liquid (of intermediate temperature) which has been heated or cooled by a mold in said machine and said valving means includes a valve for distributing to the hot tank the liquid in the uppermost range of temperatures of liquid returned from said machine, to the cold tank the liquid in the lowermost range of temperatures of liquid returned from said machine, and to said intermediate tank some of the liquid of an intermediate range of temperatures which is returned from said machine, said temperature ranges of returned liquid being selected to distribute liquid in the warmest, intermediate, and coolest ranges in substantially equal volumes of liquid to each of the hot, intermediate, and cool tanks, respectively, whereby some of the heating and cooling imparted by said circulated liquid to said mold is recovered by the liquid returned to an intermediate tank.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |