US4286370A
Expired / Lapsed
US
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Universal joint flexure hinge suspension system, and method for manufacturing this system
Assignee: INCOSYM Inc
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Filing: 1980-05-19
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Granted: 1981-09-01
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Expires: 2000-05-19
Abstract
Abstract A monolithic two axis gimbal suspension system for a tuned inertial instrument includes flexure hinges which are formed monolithically integral therein to define the pivot axis of the suspension system, each monolithically integral flexure hinge having aligned pairs of skew, crossed bridges integral with the relatively rotatable gimbals of the suspension system. The suspension system is used in a dry tuned gyroscope to suspend the gyro rotor from the gyro spin shaft. A method for making the monolithic suspension system comprises electro discharge machining of a monolithic workpiece mounted on a movable mandrel. Monolithically integral flexure hinges comprising skew, crossed bridges formed therein, interconnect gimbal portions which are formed in the workpiece. Construction of an improved tuned gyroscope employing the monolithic suspension system in a single compartment housing is described.
Inventors
- 👤 Robert J. G. Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:32
CPC Classifications
G; G01; G01C; G01C19/00; G01C19/02; G01C19/04; G01C19/16; G01C19/22; B; B23; B23H; B23H9/00; F; F16; F16C; F16C11/00; F16C11/04; F16C11/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/4984; Y10T29/49995; Y10T29/49996; Y10T403/00; Y10T403/54; Y10T74/00; Y10T74/12; Y10T74/1293
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
271 words
A method for making a monolithic flexure hinge suspension system for a tuned inertial instrument, comprising the steps of: (a) mounting on a mandrel, an axially extended workpiece having an axis and an axial hole extending at least partly therethrough, defining a bounding wall having an interior surface and an outside surface; (b) forming in said outside surface at each of two diametrically opposite locations of said workpiece an original, two complemental, adjacent depressions separated from each other by a first thin remaining raised bridge having a longitudinal dimension which is skew in relation to the axis of the workpiece; (c) forming in said interior surface at each of said two diametrically opposite locations, a secondary two complemental adjacent depressions separated from each other by a second thin remaining raised bridge having a longitudinal dimension which is skew relative to, and crosses the like dimension of said first raised bridge, and which is skew in relation to the axis of the workpiece; (d) extending at each of said locations a predetermined one of the primary and secondary depressions to meet the corresponding other depressions to form, at each location, an orifice through the tubular wall bridged across by the corresponding first and second raised crossed bridges; (e) removing in each said orifice the remaining material of the workpiece interconnecting said first raised bridge and its proximate second raised bridge to make the crossed raised bridges in each orifice separate from each other; and (f) cutting said workpiece between said diametrically opposed orifices to form two substantially co-axial, cylindrical tubes, monolithically and integrally connected only by said separated, skew, raised crossed bridges.
Claim 2
Independent Claim
271 words
A method for making a monolithic flexure hinge suspension system for a tuned inertial instrument, comprising the steps of: (a) mounting on a mandrel, an axially extended workpiece having an axis and an axial hole extending at least partly therethrough, defining a bounding wall having an interior surface and an outside surface; (b) forming in said outside surface at each of two diametrically opposite locations of said workpiece an original, two complemental, adjacent depressions separated from each other by a first thin remaining raised bridge having a longitudinal dimension which is skew in relation to the axis of the workpiece; (c) forming in said interior surface at each of said two diametrically opposite locations, a secondary two complemental adjacent depressions separated from each other by a second thin remaining raised bridge having a longitudinal dimension which is skew relative to, and crosses the like dimension of said first raised bridge, and which is skew in relation to the axis of the workpiece; (d) extending at each of said locations a predetermined one of the primary and secondary depressions to meet the corresponding other depressions to form, at each location, an orifice through the tubular wall bridged across by the corresponding first and second raised crossed bridges; (e) removing in each said orifice the remaining material of the workpiece interconnecting said first raised bridge and its proximate second raised bridge to make the crossed raised bridges in each orifice separate from each other; and (f) cutting said workpiece between said diametrically opposed orifices to form two substantially co-axial, cylindrical tubes, monolithically and integrally connected only by said separated, skew, raised crossed bridges.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said forming steps (b) and (c), form said thin remaining raised bridges with a substantially uniform cross-section substantially throughout their length.
Claim 4
Dependent Claim
24 words
The method of claim 1 further comprising the step of forming, prior to said mounting step, said axial, substantially cylindrical hole through said workpiece.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein said cutting step is performed by an electrodischarge machining cutting tool.
Claim 6
Dependent Claim
25 words
The method of claim 1 further comprising the step of rotating the workpiece with said mandrel 180 degrees between each forming of said complemental depressions.
Claim 7
Dependent Claim
40 words
The method of claim 1 wherein said forming from said outside surface and said forming from said interior surface are accomplished by moving the workpiece relative to a cutting tool to bring the workpiece and the cutting tool into engagement.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein the cutting tool comprises an electro-discharge machining tool.
Claim 9
Dependent Claim
131 words
The method of claim 1 further comprising the steps of: forming from said outside surface at diametrically opposite locations two additional primary complemental adjacent depressions, separated from each other by a thin remaining raised bridge; forming from said interior surface of said workpiece at diametrically opposite locations two additional secondary depressions, separated from each other by a second thin remaining raised bridge, said second thin raised bridge being skew relative to, and crossing said first raised bridge to form a second set of orifices through said workpiece; and further comprising the step of removing in each of said second set of orifices any part of the workpiece interconnecting said first raised bridge and its proximate second raised bridge to make the crossed raised bridges in each orifice separate from each other.
Claim 10
Dependent Claim
58 words
The method of claim 8 further comprising a second cutting step cutting said workpiece between said second set of diametrically opposed orifices to form three, monolithically connected portions, two of said portions being radially adjacent each other relative to said substantially cylindrical workpiece, said two portions being connected to the third portion by said separated, skew raised bridges.
Claim 11
Dependent Claim
40 words
The method of claim 8 further comprising a second cutting step cutting said workpiece between said second set of diametrically opposed openings to form three substantially co-axial, axially spaced cylindrical tubes monolithically connected only by said separated, skew raised bridges.
Claim 12
Dependent Claim
19 words
The method of claim 10 wherein said forming steps and said cutting steps are performed by a cutting tool.
Claim 13
Dependent Claim
14 words
The method of claim 11 wherein said cutting tool comprises an electro-discharge machining tool.
References Cited (Backward Citations)
US2611659A
Cited
US2793028A
Cited
US2931092A
Cited
US2960302A
Cited
US2947067A
Cited
US2937053A
Cited
US3063670A
Cited
US3463016A
Cited
US3290949A
Cited
US3362701A
Cited
US3413858A
Cited
US3543301A
Cited
US3430276A
Cited
US3427828A
Cited
US3527062A
Cited
US3512419A
Cited
US3614894A
Cited
US3575475A
Cited
US3585866A
Cited
US3811172A
Cited
US3702568A
Cited
US3709045A
Cited
US3856366A
Cited
US3832906A
Cited
US3957316A
Cited
US3943778A
Cited
US4003265A
Cited
US3974701A
Cited
US4114402A
Cited
US4143451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |