US3635547A - Reflector construction - Google Patents
Reflector construction Download PDFInfo
- Publication number
- US3635547A US3635547A US883016A US3635547DA US3635547A US 3635547 A US3635547 A US 3635547A US 883016 A US883016 A US 883016A US 3635547D A US3635547D A US 3635547DA US 3635547 A US3635547 A US 3635547A
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- United States
- Prior art keywords
- arms
- reflector
- construction
- guy wires
- support member
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- Expired - Lifetime
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 239000012528 membrane Substances 0.000 claims abstract description 18
- 230000006835 compression Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 abstract description 4
- 210000004379 membrane Anatomy 0.000 description 14
- 239000000463 material Substances 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003223 poly(pyromellitimide-1,4-diphenyl ether) Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
Definitions
- the present invention by virtue of comprising a thin flexible reflector membrane means stretched fiat between the projecting ends of angulated guyed support arms affords an effec tive lightweight structure which is readily adaptable for preerection compaction as by hinging of the arms for foldup together with the flexible guys and the flexible reflector mem brane means.
- FIG. 1 is a plan view of a reflector construction embodying the invention, shown in its erected state;
- FIG. 2 is an elevation view of the reflector construction of FIG. 1.
- the reflector construction 5 of the present invention in its erected state, comprises a thin flexible reflector membrane means 6 stretched flat at spaced apart intervals by tension springs 7 between the projecting ends of a plurality of equally spaced, alike, elongated tilted tubular support arms 8 extending axially and radially from a central support member 9 which are constrained against buckling under the diaphragm stretching load by pluralities of anchor guys 110, 111 and 12 connected to anchor points 113 at longitudinal intervals along the arms.
- the reflector membrane means 6 held taut and flat by the tension forces of the springs 7 at intervals about its perimeter may be of the type described and claimed in copending U.S. Pat. application, (Case 41,155) Ser. No. 883,018, filed concurrently with the present patent application, and which membrane means 6 comprises one or a number of side-by-side coplanar sheets of a light, thin, flexible material, a mi] or less in thickness, for example, such as plastic materials sold under the trade names Mylar, Kapton, etc., and having a vapor deposited reflective coating of such as aluminum thereon.
- the flexiblity of the thin membrane material enables it to be in a folded or rolled up state prior to erection of the reflector construction, and edge reinforcement by a support cable (not shown) provides for connection of the membrance 6 to the springs 7 at discrete points therearound while distributing the localized stretch forces from such springs uniformly along the membrane edges.
- Curvature of the edges of the reflector membrane means 6, such as shown in FIG. 11, translates the radially directed pull on the edge reinforcing cables (not shown) into bidirectional stretch of the reflector membrane means 6 to obtain its flatness.
- the support arms 8 as shown in FIGS. 11 and 2 may be of thin wall tubular construction, for example, having a number of longitudinal sections interconnected by hinge means (not shown) constructed and arranged to permit foldup of such arms accordion fashion to a compacted state around the central hub 9 to accommodate deployment into space, together with means (not shown) for unfolding and locking such arm sections into their aligned positions as shown in the drawing after erection of the assemblage in space; in manner similar to the radial arm foldup arrangement disclosed in copending U.S. Pat. application, Ser. No. 637,419, filed May 10, 1967.
- the tilted arms 8 are permitted to function as pure compression members in reaction to the tension forces of the springs 7 which act in a direction tending to pull the projecting arm ends together, by virtue of a system of pure tension members in the form of guys 10, 111 and 112. At the same time, such guy system establishes anchor points 113 along the arms that enhances the column strength of such arms h with respect to the compression load imposed along their length.
- the guys 10 extend radially outward and axially downward from the projecting end of a rigid mast M on the central support member 9 to the anchor points 113 at different locations along the arms 8.
- the guys llll extend laterally between longitudinally corresponding ones of the anchor points 113, and the guys 12 extend diagonally between nonlongitudinally corresponding ones of such anchor points.
- the guys 110, 1111 and 112 While of a flexible type which permits rollup for storage while such assemblage is compacted for launching into space, are in straight, taut attitudes in behalf of precisely defining the anchor points 13 for the arms h.
- Such guys are also intended to be relatively strong and relatively nonstretchable, so that a single strand or parallel strand of wires, or piano wire quality, for example, is preferred over a twisted wire cable type which may tend to be more stretch prone.
- the radial-axial guys 11 11 constrain the anchor points 13 on the arms 8 against downward movement relative to support member 9, as viewed in FIG. 2, the lateral guys 11 constrain such anchor points against upward movement relative to such member 9, and the diagonal guys 12 constrain such anchor points against sidewise or circumferential movement relative to member 9. Accordingly, at each anchor point 13 on the arms 8, such arms are constrained against buckling by the guy system and hence their capability to support the membrane tensioning load is greatly enhanced by a relatively lightweight, foldup accommodating means.
- a reflector construction comprising,
- a thin flat reflector membrane means supported and held in tension at spaced apart intervals about its periphery by the projecting ends of said arms,
- each of said arms is of equal length and is maintained in a straight attitude by the several pluralities of guy wires.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Tents Or Canopies (AREA)
- Optical Elements Other Than Lenses (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
A lightweight reflector construction suitable for use in space, having a thin flexible reflector membrane means stretched flat between the projecting ends of a plurality of arms which extend axially and radially from a central support member about which such arms are distributed. The arms accept the reflector membrane tensioning load in compression along their length and are permitted to be of relatively slender construction by virtue of a rigidizing system of guys that constrain the arms against buckling at spaced apart locations along their length.
Description
I] a ttes te nsbin et all,
[15] [451 Jan. 11,, rm
[54] nrrtrc'roa CONSTRUCTION [72) Inventors: Frank C. Rushing; Lynfordl W. Gilbert;
Albert E. Sikon, all of Ellicott City, Md.
[73] Assignee: Westinghouse Electric Corporation, Pittsburgh, Pa.
[22] Filed: Dec. 8, 1969 211 App]. No.: 883,016
[52] US. Cl ..350/288, 343/915 [51] Int. Cl. ..G02b 5/0@ [58] Field oESearch.... ..350/288,289, 292, 294,310;
[56] References Cited UNITED STATES PATENTS 2,534.710 12/1950 Golian et al. ..343/915 FOREIGN PATENTS OR APPLICATIONS 877,350 9/1961 Great Britain ..343/9 1 5 Primary Examiner-David Schonberg Assistant Examiner-Michael J. Tokar AttorneyF. l-I. Henson, E. P. Klipfel and D. F. Straitiff 5 7] ABSTRACT A lightweight reflector construction suitable for use in space, having a thin flexible reflector membrane means stretched flat between the projecting ends of a plurality of arms which extend axially and radially from a central support member about which such arms are distributed. The arms accept the reflector membrane tensioning load in compression along their length and are permitted to be of relatively slender construction by virtue of a rigidizing system of guys that constrain the arms against buckling at spaced apart locations along their length.
5 Claims, 2 Drawing Figures mu a 81972 WITNESSES INVENTORS Frank C. Rushing, Lymford W. Gilbert and Alberi 8. Simon aslrltlseron cons-mention BACKGROUND OF THE INVENTION 1. Field of the Invention Lightweight structures with plane surfaced reflector means.
2. Description of the Prior Art It has been proposed that relatively large flat mirrors be placed in orbit about a planet and aimed to reflect energy from the sun toward selected areas of such planet to enhance lighting and/or heating thereof, for example. In the behalf of convenience and effectiveness, flat reflector assemblages hundreds of feet in diameter are envisioned for such use. Weight and compactability become factors of concern in making launching of such reflector assemblages into space feasible, and rigidly of the erected assemblages is a factor concerned with maintaining reflector flatness in behalf of maximizing its effectiveness.
SUMMARY OF THE INVENTION The present invention, by virtue of comprising a thin flexible reflector membrane means stretched fiat between the projecting ends of angulated guyed support arms affords an effec tive lightweight structure which is readily adaptable for preerection compaction as by hinging of the arms for foldup together with the flexible guys and the flexible reflector mem brane means.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a plan view of a reflector construction embodying the invention, shown in its erected state; and
FIG. 2 is an elevation view of the reflector construction of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring tolFIGS. 1 and 2, the reflector construction 5 of the present invention exemplified therein, in its erected state, comprises a thin flexible reflector membrane means 6 stretched flat at spaced apart intervals by tension springs 7 between the projecting ends of a plurality of equally spaced, alike, elongated tilted tubular support arms 8 extending axially and radially from a central support member 9 which are constrained against buckling under the diaphragm stretching load by pluralities of anchor guys 110, 111 and 12 connected to anchor points 113 at longitudinal intervals along the arms.
The reflector membrane means 6 held taut and flat by the tension forces of the springs 7 at intervals about its perimeter may be of the type described and claimed in copending U.S. Pat. application, (Case 41,155) Ser. No. 883,018, filed concurrently with the present patent application, and which membrane means 6 comprises one or a number of side-by-side coplanar sheets of a light, thin, flexible material, a mi] or less in thickness, for example, such as plastic materials sold under the trade names Mylar, Kapton, etc., and having a vapor deposited reflective coating of such as aluminum thereon. The flexiblity of the thin membrane material enables it to be in a folded or rolled up state prior to erection of the reflector construction, and edge reinforcement by a support cable (not shown) provides for connection of the membrance 6 to the springs 7 at discrete points therearound while distributing the localized stretch forces from such springs uniformly along the membrane edges. Curvature of the edges of the reflector membrane means 6, such as shown in FIG. 11, translates the radially directed pull on the edge reinforcing cables (not shown) into bidirectional stretch of the reflector membrane means 6 to obtain its flatness.
The support arms 8 as shown in FIGS. 11 and 2 may be of thin wall tubular construction, for example, having a number of longitudinal sections interconnected by hinge means (not shown) constructed and arranged to permit foldup of such arms accordion fashion to a compacted state around the central hub 9 to accommodate deployment into space, together with means (not shown) for unfolding and locking such arm sections into their aligned positions as shown in the drawing after erection of the assemblage in space; in manner similar to the radial arm foldup arrangement disclosed in copending U.S. Pat. application, Ser. No. 637,419, filed May 10, 1967.
In accordance with the present invention, the tilted arms 8 are permitted to function as pure compression members in reaction to the tension forces of the springs 7 which act in a direction tending to pull the projecting arm ends together, by virtue of a system of pure tension members in the form of guys 10, 111 and 112. At the same time, such guy system establishes anchor points 113 along the arms that enhances the column strength of such arms h with respect to the compression load imposed along their length.
The guys 10 extend radially outward and axially downward from the projecting end of a rigid mast M on the central support member 9 to the anchor points 113 at different locations along the arms 8. The guys llll extend laterally between longitudinally corresponding ones of the anchor points 113, and the guys 12 extend diagonally between nonlongitudinally corresponding ones of such anchor points. In the erected state in which the assemblage or construction is: shown in the drawing, the guys 110, 1111 and 112, while of a flexible type which permits rollup for storage while such assemblage is compacted for launching into space, are in straight, taut attitudes in behalf of precisely defining the anchor points 13 for the arms h. Such guys are also intended to be relatively strong and relatively nonstretchable, so that a single strand or parallel strand of wires, or piano wire quality, for example, is preferred over a twisted wire cable type which may tend to be more stretch prone.
In the guy system, the radial-axial guys 11 11 constrain the anchor points 13 on the arms 8 against downward movement relative to support member 9, as viewed in FIG. 2, the lateral guys 11 constrain such anchor points against upward movement relative to such member 9, and the diagonal guys 12 constrain such anchor points against sidewise or circumferential movement relative to member 9. Accordingly, at each anchor point 13 on the arms 8, such arms are constrained against buckling by the guy system and hence their capability to support the membrane tensioning load is greatly enhanced by a relatively lightweight, foldup accommodating means.
What is claimed is:
l. A reflector construction comprising,
a central support member through which an axis of symmetry of the construction passes,
a plurality of arms attached to said support member at their one end and extending axially and radially therefrom with respect to said axis of circumferentially spaced apart intervals therearound,
a central mast attached to said central support member and extending along said axis in a direction opposite to that in which said arms extend,
a thin flat reflector membrane means supported and held in tension at spaced apart intervals about its periphery by the projecting ends of said arms,
a first plurality of guy wires extending from said mast to respective locations along each of said arms, and
a second plurality of guy wires extending between said arms at locations therealong.
2. The reflector construction of claim 1, wherein certain of said second plurality of guy wires extend between longitudinally corresponding locations on the arms and others extend diagonally between nonlongitudinally corresponding arm 10- cations.
3. The reflector construction of claim 11, wherein each of said arms is of equal length and is maintained in a straight attitude by the several pluralities of guy wires.
41-. The reflector construction of claim 11, wherein all of the aforesaid guy wires are prestressed in tension.
5. The reflector/construction of claim 11, wherein tension spring means are interposed between said arms and said reflector membrane means.
Claims (5)
1. A reflector construction comprising, a central support member through which an axis of symmetry of the construction passes, a plurality of arms attached to said support member at their one end and extending axially and radially therefrom with respect to said axis of circumferentially spaced apart intervals therearound, a central mast attached to said central support member and extending along said axis in a direction opposite to that in which said arms extend, a thin flat reflector membrane means supported and held in tension at spaced apart intervals about its periphery by the projecting ends of said arms, a first plurality of guy wires extending from said mast to respective locatioNs along each of said arms, and a second plurality of guy wires extending between said arms at locations therealong.
2. The reflector construction of claim 1, wherein certain of said second plurality of guy wires extend between longitudinally corresponding locations on the arms and others extend diagonally between nonlongitudinally corresponding arm locations.
3. The reflector construction of claim 1, wherein each of said arms is of equal length and is maintained in a straight attitude by the several pluralities of guy wires.
4. The reflector construction of claim 1, wherein all of the aforesaid guy wires are prestressed in tension.
5. The reflector construction of claim 1, wherein tension spring means are interposed between said arms and said reflector membrane means.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US88301669A | 1969-12-08 | 1969-12-08 |
Publications (1)
Publication Number | Publication Date |
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US3635547A true US3635547A (en) | 1972-01-18 |
Family
ID=25381816
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US883016A Expired - Lifetime US3635547A (en) | 1969-12-08 | 1969-12-08 | Reflector construction |
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US (1) | US3635547A (en) |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3738740A (en) * | 1972-07-03 | 1973-06-12 | G Campbell | Sun reflector |
US3927227A (en) * | 1974-02-27 | 1975-12-16 | Nasa | Method for manufacturing mirrors in zero gravity environment |
US4030102A (en) * | 1975-10-23 | 1977-06-14 | Grumman Aerospace Corporation | Deployable reflector structure |
US4115784A (en) * | 1977-02-04 | 1978-09-19 | The United States Of America As Represented By The Secretary Of The Air Force | Deployable ground plane antenna |
US4201991A (en) * | 1978-03-16 | 1980-05-06 | Paraframe, Inc. | Antenna structure assembled from separable parts |
US4209236A (en) * | 1977-10-21 | 1980-06-24 | The United States Of America As Represented By The United States Department Of Energy | Solar central receiver heliostat reflector assembly |
US4251135A (en) * | 1979-05-07 | 1981-02-17 | Stone Douglas C | Solar reflector |
WO1982000545A1 (en) * | 1980-07-28 | 1982-02-18 | R Luly | Parabolic reflector and method of making the same |
US4358183A (en) * | 1980-05-09 | 1982-11-09 | Carl Whiteford | Solar reflecting panel |
US4483323A (en) * | 1982-11-08 | 1984-11-20 | The United States Of America As Represented By The United States Department Of Energy | Tensioning device for a stretched membrane collector |
US4527166A (en) * | 1981-03-26 | 1985-07-02 | Luly Robert A | Lightweight folding parabolic reflector and antenna system |
US4552438A (en) * | 1984-01-09 | 1985-11-12 | The United States Of America As Represented By The United States Department Of Energy | Cable tensioned membrane solar collector module with variable tension control |
US4568945A (en) * | 1984-06-15 | 1986-02-04 | Winegard Company | Satellite dish antenna apparatus |
US4608571A (en) * | 1981-03-26 | 1986-08-26 | Luly Robert A | Collapsible parabolic reflector |
US4608964A (en) * | 1984-11-15 | 1986-09-02 | Foster Wheeler Energy Corporation | Tension solar mirror |
US4766443A (en) * | 1984-06-15 | 1988-08-23 | Winegard Company | Satellite dish antenna apparatus |
US4862190A (en) * | 1987-05-15 | 1989-08-29 | Trw Inc. | Deployable offset dish structure |
US4989015A (en) * | 1987-10-26 | 1991-01-29 | Hughes Aircraft Company | Unfurlable mesh reflector |
US5777582A (en) * | 1995-05-16 | 1998-07-07 | Cal Corporation | Deployable double-membrane surface antenna |
US5864324A (en) * | 1996-05-15 | 1999-01-26 | Trw Inc. | Telescoping deployable antenna reflector and method of deployment |
US20090133355A1 (en) * | 2007-11-27 | 2009-05-28 | Mehran Mobrem | Deployable Membrane Structure |
US20110000522A1 (en) * | 2007-10-31 | 2011-01-06 | Bender William H | Solar collector stabilized by cables and a compression element |
US20170138637A1 (en) * | 2012-09-10 | 2017-05-18 | Ahmed ADEL | Holding device |
EP3700010A1 (en) * | 2019-02-25 | 2020-08-26 | Eagle Technology, LLC | Deployable reflectors |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2534710A (en) * | 1946-05-08 | 1950-12-19 | Serge E Golian | Buoy supported collapsible radar reflector |
GB877350A (en) * | 1959-02-06 | 1961-09-13 | Chemring Ltd | Improvements in and relating to corner reflectors |
-
1969
- 1969-12-08 US US883016A patent/US3635547A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2534710A (en) * | 1946-05-08 | 1950-12-19 | Serge E Golian | Buoy supported collapsible radar reflector |
GB877350A (en) * | 1959-02-06 | 1961-09-13 | Chemring Ltd | Improvements in and relating to corner reflectors |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3738740A (en) * | 1972-07-03 | 1973-06-12 | G Campbell | Sun reflector |
US3927227A (en) * | 1974-02-27 | 1975-12-16 | Nasa | Method for manufacturing mirrors in zero gravity environment |
US4030102A (en) * | 1975-10-23 | 1977-06-14 | Grumman Aerospace Corporation | Deployable reflector structure |
US4115784A (en) * | 1977-02-04 | 1978-09-19 | The United States Of America As Represented By The Secretary Of The Air Force | Deployable ground plane antenna |
US4209236A (en) * | 1977-10-21 | 1980-06-24 | The United States Of America As Represented By The United States Department Of Energy | Solar central receiver heliostat reflector assembly |
US4201991A (en) * | 1978-03-16 | 1980-05-06 | Paraframe, Inc. | Antenna structure assembled from separable parts |
US4251135A (en) * | 1979-05-07 | 1981-02-17 | Stone Douglas C | Solar reflector |
US4358183A (en) * | 1980-05-09 | 1982-11-09 | Carl Whiteford | Solar reflecting panel |
WO1982000545A1 (en) * | 1980-07-28 | 1982-02-18 | R Luly | Parabolic reflector and method of making the same |
US4527166A (en) * | 1981-03-26 | 1985-07-02 | Luly Robert A | Lightweight folding parabolic reflector and antenna system |
US4608571A (en) * | 1981-03-26 | 1986-08-26 | Luly Robert A | Collapsible parabolic reflector |
US4483323A (en) * | 1982-11-08 | 1984-11-20 | The United States Of America As Represented By The United States Department Of Energy | Tensioning device for a stretched membrane collector |
US4552438A (en) * | 1984-01-09 | 1985-11-12 | The United States Of America As Represented By The United States Department Of Energy | Cable tensioned membrane solar collector module with variable tension control |
US4568945A (en) * | 1984-06-15 | 1986-02-04 | Winegard Company | Satellite dish antenna apparatus |
US4766443A (en) * | 1984-06-15 | 1988-08-23 | Winegard Company | Satellite dish antenna apparatus |
US4608964A (en) * | 1984-11-15 | 1986-09-02 | Foster Wheeler Energy Corporation | Tension solar mirror |
US4862190A (en) * | 1987-05-15 | 1989-08-29 | Trw Inc. | Deployable offset dish structure |
US4989015A (en) * | 1987-10-26 | 1991-01-29 | Hughes Aircraft Company | Unfurlable mesh reflector |
US5777582A (en) * | 1995-05-16 | 1998-07-07 | Cal Corporation | Deployable double-membrane surface antenna |
US5864324A (en) * | 1996-05-15 | 1999-01-26 | Trw Inc. | Telescoping deployable antenna reflector and method of deployment |
US20110000522A1 (en) * | 2007-10-31 | 2011-01-06 | Bender William H | Solar collector stabilized by cables and a compression element |
US8408198B2 (en) * | 2007-10-31 | 2013-04-02 | William H. Bender | Solar collector stabilized by cables and a compression element |
US9329383B2 (en) | 2007-10-31 | 2016-05-03 | William H. Bender | Solar collector stabilized by cables and a compression element |
US20090133355A1 (en) * | 2007-11-27 | 2009-05-28 | Mehran Mobrem | Deployable Membrane Structure |
US20170138637A1 (en) * | 2012-09-10 | 2017-05-18 | Ahmed ADEL | Holding device |
US10634386B2 (en) * | 2012-09-10 | 2020-04-28 | Ahmed Adel | Holding device |
EP3700010A1 (en) * | 2019-02-25 | 2020-08-26 | Eagle Technology, LLC | Deployable reflectors |
US11942687B2 (en) | 2019-02-25 | 2024-03-26 | Eagle Technology, Llc | Deployable reflectors |
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