Patent US3808944A successfully refreshed from Google Patents.
US3808944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical geometric generator for trochoids employing a bi-linear radial co-ordinate system
Assignee: Individual
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Filing: 1973-03-30
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Granted: 1974-05-07
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Expires: 1993-03-30
Abstract
Abstract The disclosure embraces a grinding apparatus for forming or finishing the surface of a workpiece where the forming tool is adjustably mounted on a carriage assembly which moves the forming tool while the workpiece remains stationary; the carriage assembly consists of a carriage arm which is pivotably and adjustably connected at its extremities to planetary gears which in turn are drivingly connected to a sun gear; the connections of the carriage arm to the planetary gears is rendered adjustable so that when the planetary gears are moved about the sun gear in an orbital path the trace of the forming tool will follow that of a bi-lobed trochoid in the plane in which the surface of the workpiece is situated. Adjustment means are provided so that the size of the major and minor axes of the trochoidal path of the forming tool can be varied over a wide range.
Inventors
- 👤 P Braginetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:46
CPC Classifications
B; B24; B24B; B24B19/00; B24B19/08; B24B19/09; B23; B23Q; B23Q27/00; B23Q27/006; Y; Y10; Y10T; Y10T408/00; Y10T408/39; Y10T409/00; Y10T409/30; Y10T409/304368; Y10T409/306664; Y10T409/30756
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
203 words
An apparatus for working a surface of a stationary workpiece so that the worked surface will define a trochoidal shape, comprising: a support structure having a portion for supporting a workpiece in a given plane, an annular member having an external driving surface mounted on said support structure, at least one pair of discs disposed at diametrically opposite sides of said driving surface, support means for said discs associated with said annular member for restricting bodily displacement of said discs with respect to said annular member to an orbital path about the circumference of said driving surface, means rotatably mounting said discs on said support means, a driving connection between said driving surface and said discs for rotating said discs as they are moved in said orbital path, carriage arm means extending from one of said discs to the other disc, said carriage arm means being pivotally connected to each of said discs, means for shifting the pivotal connection of said carriage arm means to said discs toward and away from the axes of rotation of each of said discs. tool means mounted on said carriage arm means for working the surface of a workpiece carried on said portion of said support structure.
Claim 2
Independent Claim
203 words
An apparatus for working a surface of a stationary workpiece so that the worked surface will define a trochoidal shape, comprising: a support structure having a portion for supporting a workpiece in a given plane, an annular member having an external driving surface mounted on said support structure, at least one pair of discs disposed at diametrically opposite sides of said driving surface, support means for said discs associated with said annular member for restricting bodily displacement of said discs with respect to said annular member to an orbital path about the circumference of said driving surface, means rotatably mounting said discs on said support means, a driving connection between said driving surface and said discs for rotating said discs as they are moved in said orbital path, carriage arm means extending from one of said discs to the other disc, said carriage arm means being pivotally connected to each of said discs, means for shifting the pivotal connection of said carriage arm means to said discs toward and away from the axes of rotation of each of said discs. tool means mounted on said carriage arm means for working the surface of a workpiece carried on said portion of said support structure.
Claim 3
Dependent Claim
38 words
The apparatus as claimed in claim 1 wherein said support means for said discs comprises a second annular member extending around the exterior of said first-mentioned annular member and mounted for rotation relative to said first-mentioned annular member.
Claim 4
Dependent Claim
32 words
The apparatus as claimed in claim 2 wherein motive means having a rotary output is provided on said support structure and said rotary output is drivingly connected to said second annular member.
Claim 5
Dependent Claim
40 words
The apparatus as claimed in claim 1 wherein said carriage arm means is provided with a guide track extending substantially parallel to said given plane between said discs, said tool means being mounted to be moveable along said guide track.
Claim 6
Dependent Claim
79 words
The apparatus as claimed in claim 4 wherein said tool means includes a support member, said support member being mounted to move along said guide track, said support member having a guide track which extends substantially perpendicular to the path of said guide track on said carriage arm, and means for moving said tool means along said guide track on said support member independently of movement of said support member''s movement along said guide track on said carriage arm.
Claim 7
Dependent Claim
96 words
The apparatus as claimed in claim 1 wherein said means for shifting said pivotal connections of said carriage arm means to said discs includes a guide track on each of said discs which passes through the axis of rotation of the disc and is perpendicular thereto, a slide platform mounted in each of said guide tracks, a said pivotal connection of said carriage arm means being mounted on a said slide platform, and motor means drivingly connected to each of said slide platforms for moving said platforms along their respective guide tracks on said respective discs.
Claim 8
Dependent Claim
75 words
The apparatus as claimed in claim 1 wherein said tool means includes a circular forming surface with the periphery of said surface extending substantially parallel to a plane that is substantially perpendicular to said given plane; said tool means further including a support member which is movable along said carriage arm means, said tool means being pivotably mounted on said support member to pivot about an axis which extends substantially perpendicular to said given plane.
Claim 9
Dependent Claim
55 words
The apparatus as claimed in claim 7 wherein means are provided on said support means for moving said tool means substantially parallel to said given plane so that said forming surface of said tool means may be maintained substantially tangent to a point lying on said axis about which said tool means is pivotably mounted.
Claim 10
Independent Claim
316 words
An apparatus for working a surface of a stationary workpiece so that the worked surface will define a trochoidal shape, comprising: a support structure having a portion for supporting a workpiece in a given plane, an annular member having an external sun gear mounted on said support structure, at least on pair of gear discs disposed on diametrically opposite sides of said sun gear, an annular support ring for said gear discs associated with said annular member for restricting bodily displacement of said gear discs with respect to said annular member to an orbital path about the circumference of said sun gear, means rotatably mounting said gear discs on said support ring, said gear discs being in driven connection with said sun gear discs being in driven connection with said sun gear whereby rotation of said support ring relative to said sun gear will effect rotation of said gear discs as said gear discs are moved in said orbital path, a pair of parallel extending carriage arms extending from one of said gear discs to the other of said gear discs, said carriage arms being pivotally connected to each of said gear discs, means for shifting the pivotal connection of said carriage arms to said discs towards and away from the axes of rotation of each of said gear discs, a tool carrier slidably mounted on said carriage arms, means for moving said tool carrier along said carriage arms, said tool carrier having pivot means thereon and an arm member pivotable about an axis on said pivot means, said axis extending perpendicular to said given plane, a forming tool mounted on said tool carrier, said forming tool having a forming surface extending substantially perpendicular to said given plane, said pivotable arm member having means for shifting said forming tool towards and away from said pivot means in a plane extending generally parallel to said given plane.
Claim 11
Independent Claim
316 words
An apparatus for working a surface of a stationary workpiece so that the worked surface will define a trochoidal shape, comprising: a support structure having a portion for supporting a workpiece in a given plane, an annular member having an external sun gear mounted on said support structure, at least on pair of gear discs disposed on diametrically opposite sides of said sun gear, an annular support ring for said gear discs associated with said annular member for restricting bodily displacement of said gear discs with respect to said annular member to an orbital path about the circumference of said sun gear, means rotatably mounting said gear discs on said support ring, said gear discs being in driven connection with said sun gear discs being in driven connection with said sun gear whereby rotation of said support ring relative to said sun gear will effect rotation of said gear discs as said gear discs are moved in said orbital path, a pair of parallel extending carriage arms extending from one of said gear discs to the other of said gear discs, said carriage arms being pivotally connected to each of said gear discs, means for shifting the pivotal connection of said carriage arms to said discs towards and away from the axes of rotation of each of said gear discs, a tool carrier slidably mounted on said carriage arms, means for moving said tool carrier along said carriage arms, said tool carrier having pivot means thereon and an arm member pivotable about an axis on said pivot means, said axis extending perpendicular to said given plane, a forming tool mounted on said tool carrier, said forming tool having a forming surface extending substantially perpendicular to said given plane, said pivotable arm member having means for shifting said forming tool towards and away from said pivot means in a plane extending generally parallel to said given plane.
References Cited (Backward Citations)
US2870578A
Cited
US3589237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |