|Publication number||US3396586 A|
|Publication date||Aug 13, 1968|
|Filing date||Dec 29, 1965|
|Priority date||Dec 29, 1965|
|Publication number||US 3396586 A, US 3396586A, US-A-3396586, US3396586 A, US3396586A|
|Inventors||Bradshaw John L, Ernest Maclin|
|Original Assignee||Gen Precision Systems Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (13), Classifications (11)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Aug- 13, 1968 I E. MACLIN ETAL. 3,396,586
SLIP RING Filed. Dec. 29, 1965 ,OO 05 lo@ r |22 mu :m ze
94 114 :ff FIG. 4 9@ BYQfmMU//Ml ATTORNEY United States Patent O 3,396,586 SLIP RING Ernest Maclin, Paramus, and John L. Bradshaw, Hillsdale, NJ., assignors to General Precision Systems Inc., a corporation of Delaware Filed Dec. 29, 1965, Ser. No. 517,318 1 Claim. (Cl. 74'5) ABSTRACT OF THE DISCLOSURE A slip arrangement for a gyroscope having a brush unit and a ring unit, the brush unit being connected to the outer gimbal having a U-shaped support frame with U-shaped wires disposed on opposite sides of rings on a ring unit, the ring unit being fixed to the inner gimbal disposed coaxially with the brush unit having a plurality of rings opposite the brush unit wires for contact thereto, the contact surfaces gradually increasing in diameter providing a substantially frusto-conical profile for ease of assembly with said wires.
The present invention relates to slip rings, and particularly to a gyro gimbal slip ring.
A conventional gyro gimbal slip ring includes a brush unit having a pivot axis and having a plurality of axiallyspaced cantilever-type wires, and includes a ring unit disposed coaxially therein having a plurality of axially-spaced coaxial conductor rings respectively disposed oposite to said wires for contact thereto with respective contact surfaces of substantially-constant outer diameter arranged to provide a ring `unit with a substantially-cylindrical outer profile.
One problem with said conventional slip ring is that a special fixture is used to open up the wire brushes in order to assemble the ring unit coaxially therein. In certain types of gyroscopes, the slip ring is disposed in a region within the gyroscope in which it is difficult to apply said special xture for assembly of said slip ring.
In accordance with one embodiment of the present invention, the need for a special xture to open up the wire brushes in order to assemble the ring unit coaxially therewith is eliminated, and the assembly of the ring unit in the brush `unit is facilitated, by using a ring unit with a substantially frusto-conical outer profile and with axiallyspaced conductor rings having contact surfaces of step diameters.
Accordingly, it is one object of the invention to provide a slip ring assembly having a ring unit and having a brush unit, which can be assembled without the use of special fixtures.
It is another object of the invention to provide -a slip ring assembly according to the aforementioned object, in which the brush unit has a plurality of wires which apply substantially equal contact forces against said ring unit.
To the fulfillment of these and other objects, the invention provides a slip ring comprising a brush unit having a pivot axis and having a plurality of axially-spaced wires, and a ring unit disposed coaxially therewith. Said ring unit has a plurality of axially-spaced coaxial conductor rings respectively disposed opposite said wires for contact thereto with respective contact surfaces of gradually increasing diameter arranged to provide a substantially frusto-conical profile for ease of assembly with said wires.
Other objects of the invention will become apparent upon reading the following description and accompanying drawings, wherein like parts are designated by like nummerals throughout the several views, and wherein:
FIG. 1 is a sectional view of a single-axis gyro, embodying features of the present invention;
FIG. 2 is an enlarged portion of FIG. 1;
FIG. 3 is a sectional view taken along the line 3-3 of FIG. 2; and
FIG. 4 is a sectional view taken along the line 4-4 of FIG. 2.
Referring to FIG, l, one embodiment of the present invention is a single-axis gyro 10. Gyro 10 includes an outer gimbal 12, an inner gimbal 14, which is pivotally supported by outer gimbal 12 for pivotal rotation relative thereto, a rotor 16, which is supported by inner gimbal 14, and a slip ring means 18, which is pivotally interconnected to outer gimbal 12 and to inner gimbal 14 for conducting electric power to rotor 16 from the exterior of outer gimbal 12.
Outer gimbal 12 has a peripheral wall 20 and a longitudinal pivot axis 22 and a pair of axially-spaced end walls 24, 26. Wall 24 has an annular bearing portion 28, which projects axially inwardly therefrom and which supports an anti-friction ball-bearing means 30. Wall 26 also has an anular bearing portion 32, which projects axially inwardly therefrom and which supports an antifriction ball-bearing means 34.
Inner gimbal 14, which is coaxial with outer gimbal 12, has a peripheral wall 36, which is concentric with wall 20 about axis 22, and a pair of axially-spaced end walls 39, 40, which are respectively disposed adjacent to walls 24, 26. Wall 38 also has a hollow Ipivot shaft 42, which is journaled in ball-bearing 30; and wall 40 has a pivot shaft 44, which is journalled in ball-bearing 34.
Rotor 16, which is the gyro momentum flywheel, has a drive motor 46 with motor leads 48, 50, 52 which connect to an exterior power supply (not shown) for supply of electric power to motor 46.
According to the invention, slip ring 18 (FIG. 2), which is coaxial with outer gimbal 12 and inner gimbal 14, includes a ring unit 54, which has the shape of a conical frustum and which is fxedly connected to shaft 42, and a brush unit 56, which is fixedly connected to wall 24. Brush unit 56 is disposed adjacent to -and radiallyoutwardly of ring unit 54 for frictional engagement therewith.
Ring unit 54 includes a plurality of conductor rings 58, 60, 62, which are axially-spaced along and concentric about axis 22, and which have radially-outer surfaces or Contact surfaces 64, 66, 68, that gradually enlarge in outer diameter along said axis 22 and have the shape of conical frustums. Ring unit 54 also includes a hollow insulation tube 70 with a radially-outer surface 72 in the shape of a conical frustum. Tube surface 72 has a plurality of axialy-spaced annular grooves 74, 76, 78, in which rings 58, 60, 62 are respectively imbedded. Tube 70 has a plurality of leads 80, 82, 84, which connect respectively to rings 58, 60, 62 at one end thereof and which connect to motor leads 48, 50, 52 at the other end thereof. Surfaces 64, 66, 68 are flush with the portions of surface 72 adjacent thereto.
Brush unit 56 has a U-shaped support frame 92, which is fixedly connected to wall 24, and which has a lpair of transversely-spaced walls 94, 96 that are disposed on radiallyopposite sides of ring unit 54. Brush unit 56 alsO has a plurality of axially-spaced U-shaped brushes or wires 98, 100, 102, which are preferably pieces of springtempered, round-sectioned wire bent to a U-shape, and has a plurality of leads 104, 106, 108, which connect respectively to wires 98, 100, 102.
Wires 98, 100, 102 have respective arm portions 110, 112 and 114, 116 and 118, 120, which respectively engage diametrically-opposite portions of ring surfaces 64, 66, 68, and which are tixedly connected at yopposite ends thereof to walls 94, 96 by cement 122 thereby forming a lseries of fixed-ended beams, which are engaged respectively by ring surfaces 64, 66, 68 substantially at the mid-spans thereof, and which are equi-distant and symmetrical about axis 22, and which are equally deflected radially upon assembly thereby applying substantially-equal spring-induced forces on rings 58, 60, 62.
In summary, this invention provides a slip ring assembly having a ring unit and a brush unit which can be assembled without the use of special xtures, and in which the brush unit has a plurality of wires that apply substantially-equal contact forces against said ring unit.
While the present invention has been described in a preferred embodiment, it will be obvious to those skilled in the art that various modiiications can be made therein within the scope of the invention. It is intended that the appended claim cover all Such modifications.
What is claimed is:
1. A gyroscope comprising:
an outer gimbal with a pivot axis, said outer gimbal having a peripheral wall and a longitudinal pivot axis and a pair of axially-spaced end walls respectively having annular bearing portions with ballbearing means disposed therein;
an inner gimbal pivotally supported from said outer gimbal coaxially therewith, said inner gimbal also having a peripheral wall and a pair of axially-spaced end walls respectively having a hollow pivot shaft journaled in a bearing adjacent thereto and a solid pivot shaft journaled in a bearing adjacent thereto; a rotor supported by said inner gimbal with a drive motor including motor leads connecting to an exterior power supply; and
slip ring means including a brush unit and a ring unit,
said brush unit having a plurality of axially-spaced wires, said brush unit being xedly connected to said outer gimbal coaxially therewith, said brush unit having a Ushaped support frame with a pair of transversely-spaced walls and further having a plurality of leadsvrespectively connected to said wires, said wires having diametrically-opposite arm portions disposed on either side of rings on said ring unit and xedly connecting opposite ends thereof to said support Walls and engaging conductor rings of said ring unit at the centers thereof, said ring unit being Xedly connected to said inner gimbal coaxially therewith and also disposed coaxially with said brush unit and having a plurality of axially-spaced coaxial conductor rings respectively disposed opposite said brush unit wires for contact thereto with respective contact surfaces of gradually increasing diameters arranged to provide a substantially frusto-conical profile for ease of assembly with said wires, said ring unit further having a hollow insulation tube with a radially-outer surface in the shape of a conical frustum and having a plurality of axially-spaced annular grooves in which said conductor rings are respectively imbedded and having a plurality of leads connecting to said rings at one end thereof and connecting to the motor leads of said rotor at the other end thereof, said `rings having respectively radiallyouter surfaces in the shape of conical frustums and being -ilush with the tube outer surface adjacent thereto.
References Cited UNITED STATES PATENTS 2,942,479 6/ 1960 Hollmann 745.7 X 3,005,173 10/1961 Aske S10-232 X 3,074,283 1/ 1963 Quermann 74--5.7 3,185,951 5/1965 Beau 310-232 X 3,193,636 7/1965 Daniels 339-8 X 3,297,973 1/ 1967 Wendell 310-245 X FOREIGN PATENTS 881,299 1l/1961 Great Britain.
C. I. HUSAR, Primary Examiner.
FRED C. MATTERN, Examiner.
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|U.S. Classification||74/5.60D, 439/24, 310/232, 74/5.00R|
|International Classification||G01C19/00, H01R39/00, G01C19/10|
|Cooperative Classification||G01C19/10, H01R39/00|
|European Classification||G01C19/10, H01R39/00|