Patent US3614249A successfully refreshed from Google Patents.
US3614249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of finishing a displacement chamber in a rotary fluid device
Assignee: Oval Kiki Kogyo KK
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Filing: 1969-08-13
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Granted: 1971-10-19
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Expires: 1989-08-13
Abstract
Abstract A method of finishing a displacement chamber in a rotary fluid device such as a rotary-disk meter, displacement pump and so on which carries a pair of rotors such as rotary disks, revolving gears. The displacement chamber comprises upright semicircular or semicylindrical wall sections and an oval-shaped bottom wall surface. These sections and surface are finished in a single cutting operation, utilizing a single finishing tool having at least two groups of bits provided on its driving shaft with a specific distance therebetween.
Inventors
- 👤 Masakatu Nishioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:16
CPC Classifications
B; B23; B23B; B23B39/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49245; Y10T408/00; Y10T408/03; Y10T408/31; Y10T408/33; Y10T408/39
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
347 words
A method of finishing the inner surfaces of a displacement chamber open at one end of a rotary gear pump or similar rotary fluid displacement device for mounting a pair of interengaging rotors having equal diameters therein, in which said inner surfaces include a pair of semicylindrical laterally displaced upright surface portions having each a diameter substantially equal to that of said rotors and a substantially oval-shaped bottom wall surface normal to said upright surface portions, said method comprising the steps of advancing through said open end of said chamber a rotating finishing tool with its axis of rotation aligned with the axis of one of said semicylindrical surface portions and having at least one bit having a cutting edge parallel to said axis of rotation and spaced therefrom a distance equal to the radius of said semicylindrical surface portion and at its lower end at least one cutting point aligned with said cutting edge to thus finish said one semicylindrical surface portion; moving, after said cutting point has reached said bottom wall surface, said chamber and said rotating finishing tool transversely relative to each other so that the axis or rotation moves along a plane including the axes of said upright semicylindrical surface portions until the axis of said rotating tool is aligned with the axis of the other of said pair of semicylindrical surface portions to thereby finish part of said bottom wall surface with said cutting point of said one bit; simultaneously subjecting said bottom wall surface to the finishing action of another cutting point provided on said finishing tool in a common plane normal to said axis of rotation with said cutting point of said one bit and arranged spaced from said axis of rotation such a distance that said other cutting point finishes during said transverse movement that part of said bottom wall surface which is not finished by said cutting point of said one bit; and retracting said rotating finishing tool along the axis of said other of said semicylindrical surface portions so as to finish said other semicylindrical surface portion.
Claim 2
Independent Claim
347 words
A method of finishing the inner surfaces of a displacement chamber open at one end of a rotary gear pump or similar rotary fluid displacement device for mounting a pair of interengaging rotors having equal diameters therein, in which said inner surfaces include a pair of semicylindrical laterally displaced upright surface portions having each a diameter substantially equal to that of said rotors and a substantially oval-shaped bottom wall surface normal to said upright surface portions, said method comprising the steps of advancing through said open end of said chamber a rotating finishing tool with its axis of rotation aligned with the axis of one of said semicylindrical surface portions and having at least one bit having a cutting edge parallel to said axis of rotation and spaced therefrom a distance equal to the radius of said semicylindrical surface portion and at its lower end at least one cutting point aligned with said cutting edge to thus finish said one semicylindrical surface portion; moving, after said cutting point has reached said bottom wall surface, said chamber and said rotating finishing tool transversely relative to each other so that the axis or rotation moves along a plane including the axes of said upright semicylindrical surface portions until the axis of said rotating tool is aligned with the axis of the other of said pair of semicylindrical surface portions to thereby finish part of said bottom wall surface with said cutting point of said one bit; simultaneously subjecting said bottom wall surface to the finishing action of another cutting point provided on said finishing tool in a common plane normal to said axis of rotation with said cutting point of said one bit and arranged spaced from said axis of rotation such a distance that said other cutting point finishes during said transverse movement that part of said bottom wall surface which is not finished by said cutting point of said one bit; and retracting said rotating finishing tool along the axis of said other of said semicylindrical surface portions so as to finish said other semicylindrical surface portion.
Claim 3
Dependent Claim
96 words
A method as defined in claim 1, wherein continuations of said semicylindrical surface portions intersect each other and said bottom wall surface to define on said bottom wall surface an area of lenticular outline having a large axis and a small axis, which area is not finished by said cutting point of said one bit during said transverse movement of said rotating finishing tool, and wherein said other cutting point is spaced from the axis of rotation of said finishing tool a distance which is smaller than said large axis but greater than said small axis.
Claim 4
Dependent Claim
41 words
A method as defined in claim 1, wherein said transverse movement of said finishing tool and said chamber relative to each other is performed by moving said chamber relative to said tool while maintaining the axis of said tool in place.
Claim 5
Dependent Claim
37 words
A method as defined in claim 1, wherein said transverse movement of said finishing tool and said chamber relative to each other is performed by moving said tool relative to said chamber while maintaining said chamber stationarily.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |