US20220196139A1 - Slew drive gearbox with torque tube - Google Patents
Slew drive gearbox with torque tube Download PDFInfo
- Publication number
- US20220196139A1 US20220196139A1 US17/227,182 US202117227182A US2022196139A1 US 20220196139 A1 US20220196139 A1 US 20220196139A1 US 202117227182 A US202117227182 A US 202117227182A US 2022196139 A1 US2022196139 A1 US 2022196139A1
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- US
- United States
- Prior art keywords
- torque tube
- housing
- worm
- ring gear
- slew drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/039—Gearboxes for accommodating worm gears
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
- F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
- F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
- F16H19/08—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary motion and oscillating motion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
- Y10T74/18792—Reciprocating or oscillating to or from alternating rotary including worm
Definitions
- This invention relates to gearboxes.
- the present invention relates to Slew drive gearboxes.
- a slew drive In the field of drive systems, a slew drive is a device that can safely hold radial and axial loads, as well as transmit a torque for rotation.
- a slew drive employs a worm mechanism, also called a screw drive, to turn a gear about an axis perpendicular to the axis of the worm. This combination reduces the speed of the driven member and also multiplies its torque.
- worm mechanism also called a screw drive
- This combination reduces the speed of the driven member and also multiplies its torque.
- the slew drive There are many applications for the slew drive. Currently, they are employed in the generation of renewable energy, particularly in solar and wind energy. Due to the load-holding power and rotational torque strength of slew drives, they are well suited to solar trackers and wind turbines. They can, however, be employed in substantially any instance where rotational movement, or “slewing” is desired.
- the cost of a slew drive often depends on the accuracy of rotation of the drive.
- a high accuracy is accomplished during fabrication of the driven gear.
- the tolerances achieved when machining or otherwise creating the teeth of the gear can greatly add to the cost of the slew drive, depending on the accuracy desired.
- This accuracy can be compromised during assembly of the slew drive gearbox. Bearings are tempered, and other heat treatments, are often required during assembly. These fluctuations in temperature can distort and reduce the accuracy of the driven gear.
- the driven gear is often refinished to restore tolerances and eliminate distortions. Often, these tolerances cannot be completely restored to the original. This further adds to the cost of the drive. Accuracy is also reduced by the normal wear over time, on the driven gear as it is used.
- An object of the present invention is to provide a new and improved slew drive.
- Another object of the present invention is to provide a slew drive that has reduced weight.
- Yet another object of the present invention is to provide a slew drive with increased accuracy.
- Another object of the present invention is to provide a slew drive with a replaceable driven gear segment.
- Yet another object of the present invention is to make the installation of a slew drive easier.
- the slew drive includes a housing, a worm shaft having a worm thread carried within the housing for rotational movement, and a torque tube having an outer diameter and a central socket.
- the torque tube is carried by the housing for rotational movement perpendicularly to the worm shaft and worm thread.
- a ring gear section with teeth is carried by the torque tube so that the teeth extend beyond the outer diameter of the torque tube and engage the worm threads. Rotation of the worm shaft rotates the worm threads engaging the teeth of the ring gear section, thereby rotating the ring gear section which rotates the torque tube.
- the housing includes an annular portion and a tubular portion.
- the annular portion defines an annular volume encircling a central aperture.
- the torque tube is carried within the annular portion.
- the tubular portion is coupled to the annular portion and defines a volume having a longitudinal axis forming a tangent to an outer diameter of the annular portion.
- the annular volume defined by the annular portion and the volume defined by the tubular portion are in communication, with the volume defined by the tubular portion overlapping the annular volume defined by the annular portion as a chord with respect to the outer diameter of the annular portion.
- the worm shaft having the worm thread is carried within the volume defined by the tubular portion. At least a portion of the worm threads extend into the annular volume at the chord and engage the teeth of the ring gear section.
- FIG. 1 is a perspective side view of a slew drive according to the present invention
- FIG. 2 is a sectional side of the slew drive of FIG. 1 ;
- FIG. 3 is a perspective side view of the housing for the slew drive gearbox of FIG. 1 ;
- FIG. 4 is a perspective side view of the torque tube of the slew drive gearbox of FIG. 1 ;
- FIG. 5 is a perspective side view of the torque tube of the slew drive gearbox of FIG. 1 with bearing members;
- FIG. 6 is a perspective side view of the torque tube of the slew drive gearbox of FIG. 1 with sealing members;
- FIG. 7 is a partial perspective view of the slew drive with the housing removed.
- FIG. 8 is a perspective view of the back side of the housing cover.
- FIGS. 1 and 2 illustrate a slew drive generally designated 10 , according to the present invention.
- Slew drive 10 includes a gearbox 11 with a housing 12 having a tubular portion 14 and an annular portion 16 .
- annular portion 16 defines an annular volume 18 encircling a central aperture 20 .
- Tubular portion 14 is coupled to annular portion 16 and defines a volume 22 having a longitudinal axis designated A. Longitudinal axis A forms a tangent to an outer diameter of annular portion 16 .
- Annular volume 18 and volume 22 are in communication with volume 22 overlapping annular volume 18 as a chord with respect to the outer diameter of annular portion 16 .
- slew drive 10 further includes a drive motor 25 coupled to tubular portion 14 of housing 12 .
- Drive motor 25 is coupled to a worm shaft 24 carrying an hourglass shaped worm thread 26 , by a planetary gear assembly 28 .
- Planetary gear assembly 28 is not described or shown in detail, as these assemblies are well known in the art.
- Worm thread 26 is carried within volume 22 of tubular portion 14 of housing 12 , and extends through annular portion 16 at the chord defined previously.
- Drive motor 25 drives worm thread 26 having a portion of worm thread 26 extending into annular volume 18 .
- Annular portion 16 of housing 12 carries a torque tube 30 and a ring gear section 32 .
- a conventionally shaped worm thread can be employed.
- a drive motor 25 is carried by the housing in the preferred embodiment, it will be understood that when multiple slewing drives are employed, the slewing drives can be driven with a series of slave shafts from a master drive motor without using a motor on each individual slewing drive.
- FIG. 4 illustrates torque tube 30 .
- Torque tube 30 includes an annular body 34 having opposed ends 35 and 36 .
- Each end 35 and 36 includes an annular inset surface 38 formed at each end 35 and 36 , and an annular extension 39 extending radially outwardly from body 34 and spaced apart from each end 35 and 36 .
- Torque tube 30 defines central socket 40 .
- a tab 42 extends from a portion of annular extension 39 at end 36 .
- Ring gear section 32 is fixedly attached directly to tab 42 so as to be positioned generally centrally between ends 35 and 36 .
- Ring gear section 32 can be directly machined into tab 42 or attached by fastening members such as pins, screws, bolts and the like, or permanent fasteners such as welding, adhesives and the like. It will be understood that ring gear section 32 is attached so that teeth of ring gear section 32 extend radially outwardly past tab 42 .
- a ring gear has a full 360° circumference.
- Ring gear segment 32 of the present invention is a section of a ring gear less than 360°. In the preferred embodiment, a ring gear is divided into 2-4 segments for use. Thus the preferred segments are 90°, 120° and 180°, but can be anything less than 360°.
- bearing element 43 is position over each end 35 and 36 , abutting annular extension 39 , forming bearing surfaces 44 .
- Bearing element 43 can be substantially any sort of bearing assembly such as ball bearing, low friction surfaces and the like. The type of bearing is only important as to allow rotation of torque tube 30 freely within annular portion 16 .
- FIG. 6 illustrates torque tube 30 having a seal member 46 carried at each end 35 and 36 seated in annular inset surface 38 .
- torque tube 30 is carried by housing 12 so as to center ring gear section 32 within the overlap of volumes 18 and 22 (chord) and in engagement with worm thread 26 .
- ring gear section 32 is driven in a first direction with a corresponding rotation of torque tube 30 in the first direction.
- drive motor 25 is reversed and drives the worm shaft in a second direction
- ring gear section 32 is driven in a second direction with a corresponding rotation of torque tube 30 in the second direction.
- housing 12 is installed as an immovable fixture. The centrally located torque tube can then be rotated relative housing 12 .
- housing 12 is sealed by housing cover 50 .
- An inner surface of cover 50 includes an annular extension 52 extending perpendicularly inwardly from an inner edge 53 defining aperture 20 , and an annular extension 55 extending perpendicularly inwardly from the inner surface of cover 50 intermediate inner edge 53 and an outer edge 58 .
- annular extension 52 engages seal member 46 , and bearing member 43 , effectively sealing housing 12 and permitting rotation of torque tube 30 with respect to housing 12 and cover 50 .
- Annular extension 55 engages and seals against housing 12 .
Abstract
A slew drive includes a housing, a worm shaft having a worm thread carried within the housing for rotational movement, and a torque tube having an outer diameter and a central socket. The torque tube is carried by the housing for rotational movement perpendicularly to the worm shaft and worm thread. A ring gear section having teeth, is carried by the torque tube so that the teeth extend beyond the outer diameter of the torque tube and engage the worm threads. Rotation of the worm shaft rotates the worm threads engaging the teeth of the ring gear section, thereby rotating the ring gear section which rotates the torque tube relative the housing.
Description
- This application is a continuation application of U.S. application Ser. No. 17/008,294, filed Aug. 31, 2020, which is a continuation of U.S. application Ser. No. 16/741,675, filed Jan. 13, 2020, which is a continuation of U.S. Ser. No. 14/489,462, filed Sep. 17, 2014, now U.S. Pat. No. 10,563,748, which claims the benefit of U.S. Provisional Application 61/879,250, all applications are incorporated herein by reference in their entirety.
- This invention relates to gearboxes.
- More particularly, the present invention relates to Slew drive gearboxes.
- In the field of drive systems, a slew drive is a device that can safely hold radial and axial loads, as well as transmit a torque for rotation. A slew drive employs a worm mechanism, also called a screw drive, to turn a gear about an axis perpendicular to the axis of the worm. This combination reduces the speed of the driven member and also multiplies its torque. There are many applications for the slew drive. Currently, they are employed in the generation of renewable energy, particularly in solar and wind energy. Due to the load-holding power and rotational torque strength of slew drives, they are well suited to solar trackers and wind turbines. They can, however, be employed in substantially any instance where rotational movement, or “slewing” is desired.
- While the current slew drives function quite well in performing the desired tasks, they can be difficult to attach to the structure to be rotated, can be heavy and can also be costly. Attaching a slew drive to structures to be rotated usually requires the fabrication of fittings to couple structures to the drive. Also, as the slew drive is increased in size to meet various uses, the weight can become increasingly problematic since as the worm and the driven gear are increased in size, the weight of material can rise quickly. In the industries in which slew drives are primarily used, less weight allows for quicker an easier installation of the drive, and less weight also allows for less manpower and additional cost savings.
- Additionally, the cost of a slew drive often depends on the accuracy of rotation of the drive. A high accuracy is accomplished during fabrication of the driven gear. The tolerances achieved when machining or otherwise creating the teeth of the gear can greatly add to the cost of the slew drive, depending on the accuracy desired. This accuracy can be compromised during assembly of the slew drive gearbox. Bearings are tempered, and other heat treatments, are often required during assembly. These fluctuations in temperature can distort and reduce the accuracy of the driven gear. Thus, to maintain accuracy, the driven gear is often refinished to restore tolerances and eliminate distortions. Often, these tolerances cannot be completely restored to the original. This further adds to the cost of the drive. Accuracy is also reduced by the normal wear over time, on the driven gear as it is used.
- It would be highly advantageous, therefore, to remedy the foregoing and other deficiencies inherent in the prior art.
- An object of the present invention is to provide a new and improved slew drive.
- Another object of the present invention is to provide a slew drive that has reduced weight.
- Yet another object of the present invention is to provide a slew drive with increased accuracy.
- And another object of the present invention is to provide a slew drive with a replaceable driven gear segment.
- And yet another object of the present invention is to make the installation of a slew drive easier.
- Briefly, to achieve the desired objects and advantages of the instant invention provided is a slew drive. The slew drive includes a housing, a worm shaft having a worm thread carried within the housing for rotational movement, and a torque tube having an outer diameter and a central socket. The torque tube is carried by the housing for rotational movement perpendicularly to the worm shaft and worm thread. A ring gear section with teeth is carried by the torque tube so that the teeth extend beyond the outer diameter of the torque tube and engage the worm threads. Rotation of the worm shaft rotates the worm threads engaging the teeth of the ring gear section, thereby rotating the ring gear section which rotates the torque tube.
- In a further aspect, the housing includes an annular portion and a tubular portion. The annular portion defines an annular volume encircling a central aperture. The torque tube is carried within the annular portion. The tubular portion is coupled to the annular portion and defines a volume having a longitudinal axis forming a tangent to an outer diameter of the annular portion. The annular volume defined by the annular portion and the volume defined by the tubular portion are in communication, with the volume defined by the tubular portion overlapping the annular volume defined by the annular portion as a chord with respect to the outer diameter of the annular portion. The worm shaft having the worm thread is carried within the volume defined by the tubular portion. At least a portion of the worm threads extend into the annular volume at the chord and engage the teeth of the ring gear section.
- The foregoing and further and more specific objects and advantages of the invention will become readily apparent to those skilled in the art from the following detailed description of a preferred embodiment thereof, taken in conjunction with the drawings in which:
-
FIG. 1 is a perspective side view of a slew drive according to the present invention; -
FIG. 2 is a sectional side of the slew drive ofFIG. 1 ; -
FIG. 3 is a perspective side view of the housing for the slew drive gearbox ofFIG. 1 ; -
FIG. 4 is a perspective side view of the torque tube of the slew drive gearbox ofFIG. 1 ; -
FIG. 5 is a perspective side view of the torque tube of the slew drive gearbox ofFIG. 1 with bearing members; -
FIG. 6 is a perspective side view of the torque tube of the slew drive gearbox ofFIG. 1 with sealing members; -
FIG. 7 is a partial perspective view of the slew drive with the housing removed; and -
FIG. 8 is a perspective view of the back side of the housing cover. - Turning now to the drawings in which like reference characters indicate corresponding elements throughout the several views, attention is directed to
FIGS. 1 and 2 which illustrate a slew drive generally designated 10, according to the present invention.Slew drive 10 includes agearbox 11 with ahousing 12 having atubular portion 14 and anannular portion 16. With additional reference toFIG. 3 ,annular portion 16 defines anannular volume 18 encircling acentral aperture 20.Tubular portion 14 is coupled toannular portion 16 and defines avolume 22 having a longitudinal axis designated A. Longitudinal axis A forms a tangent to an outer diameter ofannular portion 16.Annular volume 18 andvolume 22 are in communication withvolume 22 overlappingannular volume 18 as a chord with respect to the outer diameter ofannular portion 16. - Still referring to
FIGS. 1 and 2 , slew drive 10 further includes adrive motor 25 coupled totubular portion 14 ofhousing 12. Drivemotor 25 is coupled to aworm shaft 24 carrying an hourglass shapedworm thread 26, by aplanetary gear assembly 28.Planetary gear assembly 28 is not described or shown in detail, as these assemblies are well known in the art.Worm thread 26 is carried withinvolume 22 oftubular portion 14 ofhousing 12, and extends throughannular portion 16 at the chord defined previously. Drivemotor 25drives worm thread 26 having a portion ofworm thread 26 extending intoannular volume 18.Annular portion 16 ofhousing 12 carries atorque tube 30 and aring gear section 32. It will be understood that while an hourglass shapedworm thread 26 is preferred, a conventionally shaped worm thread can be employed. Also, while adrive motor 25 is carried by the housing in the preferred embodiment, it will be understood that when multiple slewing drives are employed, the slewing drives can be driven with a series of slave shafts from a master drive motor without using a motor on each individual slewing drive. - With brief reference to
FIGS. 4-6 ,FIG. 4 illustratestorque tube 30.Torque tube 30 includes anannular body 34 having opposed ends 35 and 36. Eachend annular inset surface 38 formed at eachend annular extension 39 extending radially outwardly frombody 34 and spaced apart from eachend Torque tube 30 definescentral socket 40. Atab 42 extends from a portion ofannular extension 39 atend 36.Ring gear section 32 is fixedly attached directly totab 42 so as to be positioned generally centrally between ends 35 and 36.Ring gear section 32 can be directly machined intotab 42 or attached by fastening members such as pins, screws, bolts and the like, or permanent fasteners such as welding, adhesives and the like. It will be understood thatring gear section 32 is attached so that teeth ofring gear section 32 extend radially outwardlypast tab 42. Here it should be noted that a ring gear has a full 360° circumference.Ring gear segment 32 of the present invention is a section of a ring gear less than 360°. In the preferred embodiment, a ring gear is divided into 2-4 segments for use. Thus the preferred segments are 90°, 120° and 180°, but can be anything less than 360°. - Turning specifically to
FIG. 5 , a bearingelement 43 is position over eachend annular extension 39, forming bearing surfaces 44. Bearingelement 43 can be substantially any sort of bearing assembly such as ball bearing, low friction surfaces and the like. The type of bearing is only important as to allow rotation oftorque tube 30 freely withinannular portion 16.FIG. 6 illustratestorque tube 30 having aseal member 46 carried at eachend annular inset surface 38. - Turning now to
FIG. 7 ,torque tube 30 is carried byhousing 12 so as to centerring gear section 32 within the overlap ofvolumes 18 and 22 (chord) and in engagement withworm thread 26. In this manner, asdrive motor 25drives worm shaft 24 in a first direction,ring gear section 32 is driven in a first direction with a corresponding rotation oftorque tube 30 in the first direction. When drivemotor 25 is reversed and drives the worm shaft in a second direction,ring gear section 32 is driven in a second direction with a corresponding rotation oftorque tube 30 in the second direction. In this manner, when in use,housing 12 is installed as an immovable fixture. The centrally located torque tube can then be rotatedrelative housing 12. - Turning to
FIG. 8 ,housing 12 is sealed byhousing cover 50. An inner surface ofcover 50 includes anannular extension 52 extending perpendicularly inwardly from aninner edge 53 definingaperture 20, and anannular extension 55 extending perpendicularly inwardly from the inner surface ofcover 50 intermediateinner edge 53 and anouter edge 58. When positioned onhousing 12,annular extension 52 engagesseal member 46, and bearingmember 43, effectively sealinghousing 12 and permitting rotation oftorque tube 30 with respect tohousing 12 andcover 50.Annular extension 55 engages and seals againsthousing 12. - Various changes and modifications to the embodiments herein chosen for purposes of illustration will readily occur to those skilled in the art. To the extent that such modifications and variations do not depart from the spirit of the invention, they are intended to be included within the scope thereof, which is assessed only by a fair interpretation of the following claims.
Claims (1)
1. A slew drive comprising:
a housing;
a worm shaft having a worm thread carried within the housing;
a torque tube having an outer diameter, the torque tube carried by the housing; and
a ring gear section having teeth, the ring gear section carried by the torque tube with the teeth extending beyond the outer diameter thereof and engaging the worm thread.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/227,182 US20220196139A1 (en) | 2013-09-18 | 2021-04-09 | Slew drive gearbox with torque tube |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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US201361879250P | 2013-09-18 | 2013-09-18 | |
US14/489,462 US10563748B2 (en) | 2013-09-18 | 2014-09-17 | Slew drive gearbox with torque tube |
US202016741675A | 2020-01-13 | 2020-01-13 | |
US202017008294A | 2020-08-31 | 2020-08-31 | |
US17/227,182 US20220196139A1 (en) | 2013-09-18 | 2021-04-09 | Slew drive gearbox with torque tube |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US202017008294A Continuation | 2013-09-18 | 2020-08-31 |
Publications (1)
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US20220196139A1 true US20220196139A1 (en) | 2022-06-23 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US14/489,462 Active US10563748B2 (en) | 2013-09-18 | 2014-09-17 | Slew drive gearbox with torque tube |
US17/227,182 Abandoned US20220196139A1 (en) | 2013-09-18 | 2021-04-09 | Slew drive gearbox with torque tube |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US14/489,462 Active US10563748B2 (en) | 2013-09-18 | 2014-09-17 | Slew drive gearbox with torque tube |
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US (2) | US10563748B2 (en) |
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Also Published As
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US10563748B2 (en) | 2020-02-18 |
US20150082923A1 (en) | 2015-03-26 |
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