Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3561719 A
Publication typeGrant
Publication dateFeb 9, 1971
Filing dateSep 24, 1969
Priority dateSep 24, 1969
Also published asCA924699A1
Publication numberUS 3561719 A, US 3561719A, US-A-3561719, US3561719 A, US3561719A
InventorsJames L Grindle
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Light fixture support
US 3561719 A
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent 1,102,079 6/1914 248/343X 1 182,351 5/1916 Cochrane..................... 248/343 Primary Examiner-Roy D. Frazier {72] Inventor James L. Grindle Hendersonville, N.C. Appl. Nov 860,676

luminaire has central aperture for receiving conduit and a mounting bushing threaded internally for engaging threaded conduit and threaded externally for engaging locking nut slidably positioned on conduit above the luminaire cover. The

Assistant ExaminerWilliam H. Schultz Attorney Sidney J. GreenbergJ. Wesley Haubner, Frank L. Neuhauser, Oscar B. Waddell and Joseph B. Forman ABSTRACT: Hanger device for supporting industrial luminaire from ceiling conduit. Cover of ballast housing at top of central aperture of the cover is formed with spaced inwardly directed lugs against which complementary radial arms of the mounting bushing are clamped upon tightening of the locking nut. The luminaire is hung on the conduit by pushing it upwardly over the mounting bushing attached to the conduit, turning it until the radial lugs of the cover aperture are aligned with the radial arms of the bushing, and tightening the locking nut on the mounting bushing.

248/343, 248/318 .F2lv 21/00,

References Cited UNITED STATES PATENTS 1,062,664 5/1913 Polachek....l.................

1 1 [22] Filed Sept. 24, 1969 [45] Patented Feb. 9, I971 [73] Assignee General Electric Company a corporation of New York [54] LIGHT FIXTURE SUPPORT 8 Claims, 4 Drawing Figs.

F2lv 21/14 [50] Field of LIGHT FIXTURE SUPPORT The present invention relates to lighting fixtures, and particularly to a hanger device for supporting a lighting fixture.

Indoor lighting fixtures such as industrial luminaires have been mounted in the past in various ways on ceiling supports, particularly on pipe conduits for conductor leads. In general, the prior methods have been relatively difficult due to the need for holding and properly positioning the fixture on the conduit support for securely mounting it thereon and making the necessary electrical connections.

It is an object of the invention to provide an improved hanger support for lighting fixtures and the like.

It is another object of the invention to provide a mounting device for hanging an industrial luminaire or the like on a ceiling conduit or other support in a convenient, safe and ready manner and without requiring the installer to handle the full weight of the luminaire in firmly securing the same to its support.

Another object of the invention is to provide a mounting device of the above type which has a minimum of parts, is simple and economical to manufacture, and is readily assembled and installed to operative position.

Other objects and advantages will become apparent from the following description and the appended claims.

With the above objects in view, the present invention relates to a mounting device for attaching a fixture to a supporting member comprising, in combination, a housing portion of the fixture having an aperture formed therein with circumferentially spaced, inwardly directed lug members, a tubular mounting member arranged in the aperture having radially projecting arm members arranged below the lug members, the respective lug members and arm members being adapted to be positioned in alignment with one another upon turning of the housing portion relative to the mounting member, the mounting member having means mounting the same on the supporting member, and locking means adapted to be loosely arranged on the supporting member above the mounting member and having securing means for adjustably engaging the mounting member, the locking means having a diameter larger than that of the aperture and being adjustable for tightening the same on the mounting member with the lug members and adjacent region of the housing portion clamped therebetween.

The invention will be better understood from the following description taken in conjunction with the accompanying drawing, in which:

FIG. 1 is a view in elevation of an industrial luminaire embodying the present invention;

FIG. 2 is a cross-sectional view of the hanger device of the invention shown in assembled condition;

FIG. 3 is an exploded viewof the parts of the luminaire hanger device shown in FIG. 2; and

FIG. 4 is a top plan view of a portion of the luminaire housing cover showing the interior of the aperture therein.

Referring now to the drawing, and particularly to FIG. I, there is shown a lighting fixture I such as an industrial luminaire for indoor lighting purposes, which may incorporate a mounting device for hanging the fixture from a conduit 2 projecting downwardly from ceiling 3. Luminaire 1 comprises, in the illustrated embodiment, a ballast housing 4 formed of a cover 4a and a container 4b defining therebetween an en closure for housing electrical ballast components for operating the lamp, such as a mercury vapor lamp, mounted within reflector 6. Such a ballast housing is disclosed in greater detail in copending application of Osteen et al., Ser. No. 850,459, filed Aug. I5, 1969, and assigned to same assignee as the present invention. It will be understood, however, that the mounting device of the invention is applicable to other types of lighting fixtures, and, in fact, to devices other than lighting fixtures.

As seen in FIG. 3, the mounting device for hanging luminaire 1 from conduit 2 comprises a tubular mounting bushing 7 formed with screw threads on its outer and inner surfaces, and a locking nut 8 with internal screw threads for thrcadably engaging the outer surface of mounting bushing 7. As seen in the assembly shown in FIG. 2, the inner surface of mounting bushing 7 threadably engages the threaded end portion of conduit 2. Set screw I3 in the wall of bushing 7 permits locking of the latter to the conduit. Locking nut 8 passes freely around circuit 2 at its upper flange portion 8a, which has an aperture larger in diameter than that of conduit 2. In the assembly, mounting bushing 7 is received in a cylindrical opening 9 formed in the top of housing cover 4 and having a diameter smaller than the outer diameter of flange 8a of lock nut 8. Bushing 7 is formed with three radially projecting arms 7a, 7b. 7c spaced circumferentially around the bushing, each radial arm having a transverse bearing surface 7d from which stop portions or ridges 7e, 7f project upwardly at opposite ends, thereby defining a seating surface. The bottom of bushing 7 is formed with a hexagonal portion 7g as shown to enable it to be turned by a suitable wrench.

Projecting inwardly from the wall 4c of housing opening 9 near the top of cover 40 are three circumferentially spaced lugs 10(sce FIG. 4) each having at their bottom a bearing surface I0a adapted to abut the corresponding bushing bearing surfaces 7d between the stop portions 7e, 7f thereon.

The arrangement is such that bushing 7 can be inserted into cover opening 9 through the top with the spaces between bushing arms 7a, 7b, 7c aligned with cover lugs I0 so that the bushing clears the lugs when being inserted, and bushing 7 may then be rotatedjn cover opening 9 until its respective bearing surfaces 7d are below and aligned with the corresponding bottom lug surfaces 10a. Turning of lock nut 8 in engagement with bushing 7 draws the latter toward lugs 10 until the aligned bearing surfaces abut each other in tight engagement. Preferably, the periphery of flange of lock nut 8 is knurled or serrated to facilitate manual tightening. It may further be formed with parallel flat portions at opposite sides (see FIG. 3) to enable turning by a wrench.

It will be noted that ridge 7e on each arm of bushing 7 is shorter than the opposite ridge 7f. This arrangement is such that ridge 7e clears the bottom of lugs I0 but ridge 7f does not, hence in the assembly procedure cover 40 may be rotated relative to bushing 7 so that lugs 10 pass over the respective ridges 7e, and relative rotation is continued until stopped by engagement of lugs I0 against the taller ridges 7}", at which point the parts are in proper position for being clamped together.

A plurality of stop members 11, Ila projecting inwardly around the inner surface of wall 4c below lugs 10 serve to limit the depth of which bushing 7 may be inserted into cover opening 9, so that even in the lowest position of bushing 7 in which it is held by stop or holding members 11, Ila, ridge 7] cannot clear the bottoms of lugs 10 upon turning of cover 40 relative to bushing 7. One of these stop members shown as 11a is of enlarged diameter and is tapped to receive a screw I5 for holding therrnal baffle plates 16 as more fully disclosed in the aforementioned pending application.

As will be evident from the foregoing, the arrangement and dimensions of the described structures are such that the distance between the plane of the tops of holding members 11, 11a and the plane of the bottoms of lugs 10 is less than the distance between the plane of the bottom of mounting bushing 7 and the plane of the tops of ridges 7f, and is greater than the distance between the plane of the bottom of mounting bushing 7 and the plane of the tops of ridges 7e.

, In a usual procedure .for installing light fixture I on ceiling conduit 2, lock nut 8 is first slid onto conduit 2, and bushing 7 is threaded in firm engagement with conduit 2 and locked thereon by set screw I3. The arrows provided on the bottom of hexagonal portion 7g assist inorienting the installed luminaire, since the installer may secure bushing 7 on conduit 2 with any one of the arrows pointing in the direction which the front of the luminaire is to face. With bushing 7 thus oriented and secured, lock nut 8 is then loosely assembled in threaded engagement with bushing 7 with a suitable gasket I2 therebetween, as shown. Ballast housing 4 of the luminaire, which is separable from the remainder of the luminaire structure, is then raised, and cover opening 9 is inserted over bushing 7, and the housing is then turned relative to the latter until lugs 10 are aligned with bushing bearing surfaces 7d as previously described. Since bushing 7 is already firmly secured to conduit 2, the ballast housing may be allowed to hang on bushing arms 70, 7b, 7c prior to the tightening step. Locking nut 8 is then tightened on bushing 7 to clamp the parts together in tight assembly. With ballast housing 4 thus installed, wire leads within the latter may be connected to leads extending from conduit 2 through the access provided by removable panel in cover 40 (see FIG. 1). The limiting of relative rotation of cover 4a and mounting bushing 7 due to the stop por tion 7f of the latter serves not only to properly position lugs 10 and bearing surfaces 7d as above described, but also to avoid twisting of the connected leads. The remainder of the luminaire structure may then be attached to the bottom of the thus secured ballast housing.

There is thus provided a hanger device which enables lighting fixtures and other devices to be quickly and safely mounted on ceiling supports without the need for handling the entire weight of the fixture or holding the fixture while it is tightened on the support.

While the present invention has been described with reference to particular embodiments thereof, it will be understood that numerous modifications may be made by those skilled in the art without actually departing from the scope of the invention. Accordingly, I wish to have it understood that I intend herein to cover all such modifications as fall within the true spirit and scope of my invention.

lelaim:

1. Mounting device for attaching a fixture to a supporting member comprising, in combination, a housing portion of said fixture formed with an aperture having circumferentially spaced lug members directed inwardly therein, a tubular mounting member arranged in said aperture and having spaced radially projecting arm members arranged below said lug members, the respective lug members and arm members being adapted to be positioned in alignment with one another upon turning of said housing portion relative to said mounting member, said mounting member having means for attaching the same to the supporting member, and annular locking means having a lower portion adjustably engaging said mounting member and an upper flange portion engageable with said housing portion adjacent the aperture therein, said locking means being adjustable for tightening the same on said mount 7 ing means with said lug members and said adjacent housing portion clamped thcrebetween.

2. A device as defined in claim 1, said stop means on said mounting member engageable with said lug members for limiting turning of said housing portion relative to said mounting member and for aligning said lug members and said arm members.

3. A device as defined in claim 2, said housing portion having holding means projecting inwardly in said aperture below said lug mcmbers for limiting the insertion of said mounting member in said aperture to a predetermined position for preventing clearance between said lug members and said stop means during turning of said housing portion relative to said mounting member.

4. A device as defined in claim 3, said attaching means of said mounting member comprising an internally threaded portion of said mounting member for engagement with the supporting member, said mounting member being externally threaded for engagement with said locking means.

5. A device as defined in claim 4, and means for fixedly securing said mounting member to the supporting member.

6. A device as'defined in claim 2, each said arm member being formed with a bearing surface extending transverse the axis of said mounting member, said stop means comprising a first ridge extending upwardly from each said bearing surface, and a second ridge shorter than said first ridge and spaced therefrom extending upwardly from said bearing surface said bearing surface and said first and second ridges thereof defining a seat for receiving the respective lug memberv 7. A device as defined in claim 6, said housing portion having holding means projecting inwardly in said aperture below said lug members for limiting the insertion of said mounting member in said aperture, the distance between the top plane of said holding means and the bottom plane of said lug members being less than the distance between the bottom plane of said mounting member and the top plane of said first ridge, and being greater than the distance between the bottom plane of said mounting member and the top plane of said second ridge.

8. A device as defined in claim 3, said mounting member being formed at its bottom with a polygonal portion, whereby it may be operated by a wrench.

$273333 UNKTED s'mrEs PATENT ()FFIC CERTIFICATE OF CORREQTKQN Patent: No. 3;5 ;Y 9 JQDxQQiB'L-QJL Inventor(s) James L; Grindle It is certified that error appears in th above-identified pt ent v and the saidLercerg Patentlgre hereby gorrecced as shown below:

signed arid s e a1ed 155 1115; -971:;

(SEAL) g 'At'test: I 1- EDWARD .HILLIAM "SGHUYLER, Attesting Officer Q'opmaiqsippg'r of Pate

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1062664 *Sep 5, 1911May 27, 1913Chas Polacheck & Bro CoFixture-coupling.
US1102079 *Jan 21, 1913Jun 30, 1914Arthur D RizerSeparable fixture-joint.
US1182351 *Apr 12, 1915May 9, 1916William B CochraneElectric-light fixture.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6608453May 30, 2001Aug 19, 2003Color Kinetics IncorporatedMethods and apparatus for controlling devices in a networked lighting system
US6624597Aug 31, 2001Sep 23, 2003Color Kinetics, Inc.Systems and methods for providing illumination in machine vision systems
US6634616 *Dec 1, 2000Oct 21, 2003General Electric CompanyTwist lock fixture attachment system
US6717376Nov 20, 2001Apr 6, 2004Color Kinetics, IncorporatedAutomotive information systems
US6720745 *Dec 17, 1998Apr 13, 2004Color Kinetics, IncorporatedData delivery track
US6774584Oct 25, 2001Aug 10, 2004Color Kinetics, IncorporatedMethods and apparatus for sensor responsive illumination of liquids
US6777891May 30, 2002Aug 17, 2004Color Kinetics, IncorporatedMethods and apparatus for controlling devices in a networked lighting system
US6781329Oct 25, 2001Aug 24, 2004Color Kinetics IncorporatedMethods and apparatus for illumination of liquids
US6801003May 10, 2002Oct 5, 2004Color Kinetics, IncorporatedSystems and methods for synchronizing lighting effects
US6869204Oct 25, 2001Mar 22, 2005Color Kinetics IncorporatedLight fixtures for illumination of liquids
US6888322Jul 27, 2001May 3, 2005Color Kinetics IncorporatedSystems and methods for color changing device and enclosure
US6897624Nov 20, 2001May 24, 2005Color Kinetics, IncorporatedPackaged information systems
US6936978Oct 25, 2001Aug 30, 2005Color Kinetics IncorporatedMethods and apparatus for remotely controlled illumination of liquids
US6965205Sep 17, 2002Nov 15, 2005Color Kinetics IncorporatedLight emitting diode based products
US6967448Oct 25, 2001Nov 22, 2005Color Kinetics, IncorporatedMethods and apparatus for controlling illumination
US6975079Jun 17, 2002Dec 13, 2005Color Kinetics IncorporatedSystems and methods for controlling illumination sources
US6981679 *Nov 3, 2003Jan 3, 2006Nate MullenMounting bracket for light fixture
US7031920Jul 26, 2001Apr 18, 2006Color Kinetics IncorporatedLighting control using speech recognition
US7038399May 9, 2003May 2, 2006Color Kinetics IncorporatedMethods and apparatus for providing power to lighting devices
US7042172Sep 17, 2003May 9, 2006Color Kinetics IncorporatedSystems and methods for providing illumination in machine vision systems
US7064498Mar 13, 2001Jun 20, 2006Color Kinetics IncorporatedLight-emitting diode based products
US7132804Oct 30, 2003Nov 7, 2006Color Kinetics IncorporatedData delivery track
US7135824Aug 11, 2004Nov 14, 2006Color Kinetics IncorporatedSystems and methods for controlling illumination sources
US7161311Nov 4, 2003Jan 9, 2007Color Kinetics IncorporatedMulticolored LED lighting method and apparatus
US7178941May 5, 2004Feb 20, 2007Color Kinetics IncorporatedLighting methods and systems
US7186003Mar 13, 2001Mar 6, 2007Color Kinetics IncorporatedLight-emitting diode based products
US7187141Jul 16, 2004Mar 6, 2007Color Kinetics IncorporatedMethods and apparatus for illumination of liquids
US7202613Feb 6, 2003Apr 10, 2007Color Kinetics IncorporatedControlled lighting methods and apparatus
US7221104May 30, 2002May 22, 2007Color Kinetics IncorporatedLinear lighting apparatus and methods
US7229057 *Dec 8, 2004Jun 12, 2007Cavell Christopher NMulti-purpose anti-sway rotating stem mount
US7231060Jun 5, 2002Jun 12, 2007Color Kinetics IncorporatedSystems and methods of generating control signals
US7242152Jun 13, 2002Jul 10, 2007Color Kinetics IncorporatedSystems and methods of controlling light systems
US7248239Aug 6, 2004Jul 24, 2007Color Kinetics IncorporatedSystems and methods for color changing device and enclosure
US7253566May 10, 2004Aug 7, 2007Color Kinetics IncorporatedMethods and apparatus for controlling devices in a networked lighting system
US7274160Mar 26, 2004Sep 25, 2007Color Kinetics IncorporatedMulticolored lighting method and apparatus
US7300192Oct 3, 2003Nov 27, 2007Color Kinetics IncorporatedMethods and apparatus for illuminating environments
US7303300Sep 5, 2003Dec 4, 2007Color Kinetics IncorporatedMethods and systems for illuminating household products
US7309965Feb 14, 2003Dec 18, 2007Color Kinetics IncorporatedUniversal lighting network methods and systems
US7352138Apr 18, 2006Apr 1, 2008Philips Solid-State Lighting Solutions, Inc.Methods and apparatus for providing power to lighting devices
US7358679Mar 31, 2005Apr 15, 2008Philips Solid-State Lighting Solutions, Inc.Dimmable LED-based MR16 lighting apparatus and methods
US7385359Nov 20, 2001Jun 10, 2008Philips Solid-State Lighting Solutions, Inc.Information systems
US7427840May 14, 2004Sep 23, 2008Philips Solid-State Lighting Solutions, Inc.Methods and apparatus for controlling illumination
US7449847Aug 11, 2004Nov 11, 2008Philips Solid-State Lighting Solutions, Inc.Systems and methods for synchronizing lighting effects
US7453217Nov 16, 2004Nov 18, 2008Philips Solid-State Lighting Solutions, Inc.Marketplace illumination methods and apparatus
US7462997Jul 10, 2007Dec 9, 2008Philips Solid-State Lighting Solutions, Inc.Multicolored LED lighting method and apparatus
US7482764Oct 25, 2001Jan 27, 2009Philips Solid-State Lighting Solutions, Inc.Light sources for illumination of liquids
US7525254Nov 3, 2004Apr 28, 2009Philips Solid-State Lighting Solutions, Inc.Vehicle lighting methods and apparatus
US7550931Mar 15, 2007Jun 23, 2009Philips Solid-State Lighting Solutions, Inc.Controlled lighting methods and apparatus
US7572028Jan 22, 2007Aug 11, 2009Philips Solid-State Lighting Solutions, Inc.Methods and apparatus for generating and modulating white light illumination conditions
US7598681Jun 12, 2007Oct 6, 2009Philips Solid-State Lighting Solutions, Inc.Methods and apparatus for controlling devices in a networked lighting system
US7598684Jun 12, 2007Oct 6, 2009Philips Solid-State Lighting Solutions, Inc.Methods and apparatus for controlling devices in a networked lighting system
US7598686Apr 26, 2007Oct 6, 2009Philips Solid-State Lighting Solutions, Inc.Organic light emitting diode methods and apparatus
US7628366 *Sep 5, 2006Dec 8, 2009Vtc Electronics CorporationCeiling mount
US7642730Dec 18, 2007Jan 5, 2010Philips Solid-State Lighting Solutions, Inc.Methods and apparatus for conveying information via color of light
US7652436Dec 3, 2007Jan 26, 2010Philips Solid-State Lighting Solutions, Inc.Methods and systems for illuminating household products
US7659674May 1, 2007Feb 9, 2010Philips Solid-State Lighting Solutions, Inc.Wireless lighting control methods and apparatus
US7764026Oct 23, 2001Jul 27, 2010Philips Solid-State Lighting Solutions, Inc.Systems and methods for digital entertainment
US7845823Sep 30, 2004Dec 7, 2010Philips Solid-State Lighting Solutions, Inc.Controlled lighting methods and apparatus
US7926975Mar 16, 2010Apr 19, 2011Altair Engineering, Inc.Light distribution using a light emitting diode assembly
US7938562Oct 24, 2008May 10, 2011Altair Engineering, Inc.Lighting including integral communication apparatus
US7946729Jul 31, 2008May 24, 2011Altair Engineering, Inc.Fluorescent tube replacement having longitudinally oriented LEDs
US7959320Jan 22, 2007Jun 14, 2011Philips Solid-State Lighting Solutions, Inc.Methods and apparatus for generating and modulating white light illumination conditions
US7976196Jul 9, 2008Jul 12, 2011Altair Engineering, Inc.Method of forming LED-based light and resulting LED-based light
US8118447Dec 20, 2007Feb 21, 2012Altair Engineering, Inc.LED lighting apparatus with swivel connection
US8207821Feb 8, 2007Jun 26, 2012Philips Solid-State Lighting Solutions, Inc.Lighting methods and systems
US8214084Oct 2, 2009Jul 3, 2012Ilumisys, Inc.Integration of LED lighting with building controls
US8251544Jan 5, 2011Aug 28, 2012Ilumisys, Inc.Lighting including integral communication apparatus
US8256924Sep 15, 2008Sep 4, 2012Ilumisys, Inc.LED-based light having rapidly oscillating LEDs
US8299695Jun 1, 2010Oct 30, 2012Ilumisys, Inc.Screw-in LED bulb comprising a base having outwardly projecting nodes
US8324817Oct 2, 2009Dec 4, 2012Ilumisys, Inc.Light and light sensor
US8330381May 12, 2010Dec 11, 2012Ilumisys, Inc.Electronic circuit for DC conversion of fluorescent lighting ballast
US8360599May 23, 2008Jan 29, 2013Ilumisys, Inc.Electric shock resistant L.E.D. based light
US8362710Jan 19, 2010Jan 29, 2013Ilumisys, Inc.Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays
US8421366Jun 23, 2010Apr 16, 2013Ilumisys, Inc.Illumination device including LEDs and a switching power control system
US8439322 *May 27, 2011May 14, 2013Windstream Intellectual Property Services, Inc.Apparatus and method for mounting of cabinets
US8444292Oct 5, 2009May 21, 2013Ilumisys, Inc.End cap substitute for LED-based tube replacement light
US8454193Jun 30, 2011Jun 4, 2013Ilumisys, Inc.Independent modules for LED fluorescent light tube replacement
US8523394Oct 28, 2011Sep 3, 2013Ilumisys, Inc.Mechanisms for reducing risk of shock during installation of light tube
US8540401Mar 25, 2011Sep 24, 2013Ilumisys, Inc.LED bulb with internal heat dissipating structures
US8541958Mar 25, 2011Sep 24, 2013Ilumisys, Inc.LED light with thermoelectric generator
US8556452Jan 14, 2010Oct 15, 2013Ilumisys, Inc.LED lens
US8596813Jul 11, 2011Dec 3, 2013Ilumisys, Inc.Circuit board mount for LED light tube
US8653984Oct 24, 2008Feb 18, 2014Ilumisys, Inc.Integration of LED lighting control with emergency notification systems
US8664880Jan 19, 2010Mar 4, 2014Ilumisys, Inc.Ballast/line detection circuit for fluorescent replacement lamps
US8674626Sep 2, 2008Mar 18, 2014Ilumisys, Inc.LED lamp failure alerting system
US8807785Jan 16, 2013Aug 19, 2014Ilumisys, Inc.Electric shock resistant L.E.D. based light
US20110290957 *May 27, 2011Dec 1, 2011Skudin Michael EApparatus and method for mounting of cabinets
Classifications
U.S. Classification248/343, 248/318
International ClassificationF21V21/005, F21V21/02
Cooperative ClassificationF21V21/02, F21V21/005
European ClassificationF21V21/005, F21V21/02