EP0037958B1 - Combined lighting and air exhaust device for an underpressure ceiling - Google Patents

Combined lighting and air exhaust device for an underpressure ceiling Download PDF

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Publication number
EP0037958B1
EP0037958B1 EP81102437A EP81102437A EP0037958B1 EP 0037958 B1 EP0037958 B1 EP 0037958B1 EP 81102437 A EP81102437 A EP 81102437A EP 81102437 A EP81102437 A EP 81102437A EP 0037958 B1 EP0037958 B1 EP 0037958B1
Authority
EP
European Patent Office
Prior art keywords
housing
openings
reflector
ventilation openings
fluorescent lamp
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.)
Expired
Application number
EP81102437A
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German (de)
French (fr)
Other versions
EP0037958A1 (en
Inventor
Kurt Schmoll
Rüdiger Goltz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT81102437T priority Critical patent/ATE3669T1/en
Publication of EP0037958A1 publication Critical patent/EP0037958A1/en
Application granted granted Critical
Publication of EP0037958B1 publication Critical patent/EP0037958B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F24F13/078—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser combined with lighting fixtures

Definitions

  • the invention relates to an exhaust air lamp for a vacuum ceiling according to the first part of claim 1.
  • the exhaust air openings are in the top surface of the housing. They are relatively small (2 cm in diameter) and in large numbers arranged parallel to the fluorescent lamp: In this way, the required, sufficiently uniform cooling of the fluorescent lamp by the exhaust air is still guaranteed even if a part of the exhaust air openings for the purpose of adjusting a certain one Pressure drop are closed by plastic parts.
  • the invention has for its object to develop an exhaust lamp of the type mentioned so that a much larger range of operating points can be covered with the same housing with little effort in material and assembly time; above all, a high pressure drop - greater than 10 Pascal - with a low volume flow - less than 80 m 3 per hour - should also be adjustable.
  • the invention thus creates an exhaust air lamp in which a working point with a high pressure drop and low volume flow can be set by covering relatively fewer, but large exhaust air openings. Practically ten exhaust air openings are sufficient to set an operating point with practically maximum volume flow.
  • Cheap plastic covers with preferably concentric notches serve to cover all or part of the exhaust air openings: By cutting out part of the cover along such a notch, a defined opening cross-section can easily be set, which is smaller than the exhaust air opening in the housing.
  • the trough-shaped reflector on the one hand and the housing surrounding it on the other hand enclose a pressure compensation chamber into which the exhaust air is only through the longitudinal slots can flow into the reflector.
  • the housing of the exhaust air lamp designated 1 has essentially vertical side walls 11, 12, a light exit opening 13 and a substantially rectangular cross section. In each of the side walls there are five circular openings with the same cross-section and the same distance from one another, two openings 101 and 102 of which can be seen in FIG. 1.
  • the fluorescent lamp 10 is arranged in the center of the housing and a channel-shaped reflector is arranged around it.
  • the latter consists of a roof mirror 141 fixedly mounted in the housing and two side mirrors 142, 143, which together with a grid form a unit which can be removed from the housing.
  • Side mirrors and roof mirrors are arranged in such a way that a longitudinal gap 140 remains between them, through which the exhaust air entering from the room through the light exit opening 13 reaches the openings 101, 102.
  • Each of the openings in the housing 1 can be closed by a circular cover 2 made of plastic, which for this purpose has on the inside a circular bead 23 and four hook-shaped spring arms 22 which reach through the openings 101, 102 and get caught behind the edges of the opening.
  • the bead ring serves as a seal.
  • the cover 2 On the front, the cover 2 has coaxial notches a to f, through which a circular inner part 20 and concentric circular rings 21 are formed. Each of the notches thus limits one of the possible opening cross sections.
  • the pressure drop% P (ordinate) is plotted against the exhaust air volume flow V (abscissa), the number of openings covered or the cutting groove used in each case being indicated as a parameter at the upper edge. From this it can be seen that, on the one hand, volume flows of up to 500 m 3 per hour can be managed with a pressure drop of 30 Pascal (all openings open), but nevertheless that with a volume flow as low as 20 m 3 per hour there is still a pressure drop of more than 20 Pascal can be reached. In the latter case, nine openings are completely closed and the middle section 20 is cut out in the lid of the tenth opening, so that the passage opening is determined by the notch f.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Ventilation (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
  • Amplifiers (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

1. Ventilated light for a low-pressure cover, comprising a housing (1) which has ventilating openings (101, 102) of identical shape and size which can be closed either completely or partially by synthetic components, and comprising two side reflectors (142, 143) which are arranged in the housing on both sides of a fluorescent lamp (10) and which between one another define the light outlet opening (13) below and the air throughput opening (140) above, characterised in that the side reflectors (142, 143), together with a roof reflector (141) arranged between them, form a channel shaped reflector enclosing the fluorescent lamp (10) and the upper third portion of which is provided with a longitudinal slot (140) between the roof reflector (141) and each side reflector (142, 143), that at least two, preferably ten, ventilation openings (101, 102) are arranged in the side walls (11, 12) of the housing (1), each of which openings has a minimum cross-section of 20 cm**2 and which are uniformly distributed along the length of the housing (1), and that the ventilation openings (101, 102) can be closed by means of snap-fitted covers (2) which consist of synthetic material and which have components (20, 21) which can be cut out and which are delimited from one another by grooves (a to f).

Description

Die Erfindung betrifft eine Abluftleuchte für eine Unterdruckdecke gemäß erstem Teil von Anspruch 1.The invention relates to an exhaust air lamp for a vacuum ceiling according to the first part of claim 1.

Bei einer solchen aus dem DE-4-6 752 685 bekannten Abluftleuchte liegen die Abluftöffnungen in der Deckfläche des Gehäuses. Sie sind verhältnismäßig klein (2 cm Durchmesser) und in großer Zahl parallel zu der Leuchtstofflampe angeordnet : Auf diese Weise ist die erforderliche, ausreichend gleichmäßige Kühlung der Leuchtstofflampe durch die Abluft auch dann noch gewährleistet, wenn ein Teil der Abluftöffnungen zum Zweck der Einstellung eines bestimmten Druckabfalles durch Kunststoffteile verschlossen sind.In such an exhaust air lamp known from DE-4-6 752 685, the exhaust air openings are in the top surface of the housing. They are relatively small (2 cm in diameter) and in large numbers arranged parallel to the fluorescent lamp: In this way, the required, sufficiently uniform cooling of the fluorescent lamp by the exhaust air is still guaranteed even if a part of the exhaust air openings for the purpose of adjusting a certain one Pressure drop are closed by plastic parts.

Der Bereich der auf diese Weise einstellbaren Widerstände ist jedoch praktisch verhältnismäßig klein : Man könnte zwar theoretisch ein Gehäuse mit einer so großen Anzahl von Löchern fertigen, daß sich damit alle praktisch vorkommenden Betriebsbedingungen abdecken lassen ; bei niedrigem Volumenstrom müßte jedoch eine sehr große Anzahl von Löchern durch Kunststoffteile abgedeckt werden, was einen nicht vertretbaren Aufwand an Material und Montagezeit bedeuten würde.However, the range of resistors that can be set in this way is practically comparatively small: in theory, one could manufacture a housing with such a large number of holes that it can cover all practical operating conditions; with a low volume flow, however, a very large number of holes would have to be covered by plastic parts, which would mean an unacceptable effort in terms of material and assembly time.

Der Erfindung liegt die Aufgabe zugrunde, eine Abluftleuchte der eingangs genannten Art so weiterzubilden, daß sich ein wesentlich größerer Bereich von Arbeitspunkten mit demselben Gehäuse bei geringem Aufwand an Material und Montagezeit überstreichen läßt ; vor allem soll auch ein hoher Druckabfall - größer 10 Pascal - bei niedrigem Volumenstrom - kleiner 80 m3 pro Stunde - einstellbar sein.The invention has for its object to develop an exhaust lamp of the type mentioned so that a much larger range of operating points can be covered with the same housing with little effort in material and assembly time; above all, a high pressure drop - greater than 10 Pascal - with a low volume flow - less than 80 m 3 per hour - should also be adjustable.

Die erfindungsgemäße Lösung dieser Aufgabe ist durch die im kennzeichnenden Teil von Anspruch 1 angegebenen Merkmale charakterisiert.The achievement of this object is characterized by the features specified in the characterizing part of claim 1.

Die Erfindung schafft somit eine Abluftleuchte, bei der sich ein Arbeitspunkt mit hohem Druckabfall und niedrigem Volumenstrom durch Abdecken verhältnismäßig weniger, dafür aber großer Abluftöffnungen einstellen läßt. Dabei genügen praktisch zehn Abluftöffnungen, um auch einen Arbeitspunkt mit praktisch maximalem Volumenstrom einstellen zu können. Zur ganzen oder teilweisen Abdeckung der Abluftöffnungen dienen dabei billige Kunststoffdeckel mit vorzugsweise konzentrischen Einkerbungen : Durch Ausschneiden eines Teiles des Deckels entlang einer solchen Einkerbung läßt sich leicht ein definierter Öffnungsquerschnitt einstellen, der kleiner ist als die Abluftöffnung im Gehäuse.The invention thus creates an exhaust air lamp in which a working point with a high pressure drop and low volume flow can be set by covering relatively fewer, but large exhaust air openings. Practically ten exhaust air openings are sufficient to set an operating point with practically maximum volume flow. Cheap plastic covers with preferably concentric notches serve to cover all or part of the exhaust air openings: By cutting out part of the cover along such a notch, a defined opening cross-section can easily be set, which is smaller than the exhaust air opening in the housing.

Bei der Erfindung ist eine gleichmäßige Umströmung der Leuchtstofflampe auf ihrer ganzen Länge trotz Verwendung nur weniger Abluftöffnungen mit großem Querschnitt sichergestellt: Von dem rinnenförmigen Reflektor einerseits und dem diesen umgebenden Gehäuse andererseits ist nämlich ein t)ruckausgleichsraum umschlossen, in den die Abluft nur durch die Längsschlitze in dem Reflektor einströmen kann.In the invention, a uniform flow around the fluorescent lamp over its entire length is ensured despite the use of only a few exhaust air openings with a large cross-section: the trough-shaped reflector on the one hand and the housing surrounding it on the other hand enclose a pressure compensation chamber into which the exhaust air is only through the longitudinal slots can flow into the reflector.

Ein Ausführungsbeispiel der Erfindung wird anhand der Figuren näher erläutert ; es zeigen

  • Figur 1 einen Querschnitt durch eine Abluftleuchte,
  • Figur 2 eine Draufsicht auf einen Deckel,
  • Figur 3 einen Querschnitt durch diesen Deckel entlang Linie 111-111 in Fig. 2, und
  • Figur 4 ein Volumenstrom-/Druckdiagramm, das den überdeckten Einstellbereich erkennen läßt.
An embodiment of the invention is explained in more detail with reference to the figures; show it
  • FIG. 1 shows a cross section through an exhaust air lamp,
  • FIG. 2 shows a top view of a lid,
  • 3 shows a cross section through this cover along line 111-111 in Fig. 2, and
  • Figure 4 is a volume flow / pressure diagram that shows the covered setting range.

Das mit 1 bezeichnete Gehäuse der Abluftleuchte hat im wesentlichen vertikale Seitenwände 11, 12, eine Lichtaustrittsöffnung 13 und einen im wesentlichen rechteckigen Querschnitt. In den Seitenwänden sind jeweils fünf kreisrunde Öffnungen mit gleichem Querschnitt und untereinander gleichem Abstand angeordnet, von denen zwei Öffnungen 101 und 102 in Fig. 1 erkennbar sind. In dem Gehäuse ist mittig die Leuchtstofflampe 10 und um sie herum ein rinnenförmiger Reflektor angeordnet. Letzterer besteht aus einem fest in dem Gehäuse montierten Dachspiegel 141 und zwei Seitenspiegeln 142, 143, die zusammen mit einem Raster eine aus dem Gehäuse herausnehmbare Einheit bilden. Seitenspiegel und Dachspiegel sind so angeordnet, daß zwischen ihnen jeweils ein Längsspalt 140 offenbleibt, durch die vom Raum durch die Lichtaustrittsöffnung 13 eintretende Abluft zu den Öffnungen 101, 102 gelangt.The housing of the exhaust air lamp, designated 1, has essentially vertical side walls 11, 12, a light exit opening 13 and a substantially rectangular cross section. In each of the side walls there are five circular openings with the same cross-section and the same distance from one another, two openings 101 and 102 of which can be seen in FIG. 1. The fluorescent lamp 10 is arranged in the center of the housing and a channel-shaped reflector is arranged around it. The latter consists of a roof mirror 141 fixedly mounted in the housing and two side mirrors 142, 143, which together with a grid form a unit which can be removed from the housing. Side mirrors and roof mirrors are arranged in such a way that a longitudinal gap 140 remains between them, through which the exhaust air entering from the room through the light exit opening 13 reaches the openings 101, 102.

Jede der Öffnungen in dem Gehäuse 1 ist durch einen kreisrunden Deckel 2 aus Kunststoff verschließbar, der hierzu auf der Innenseite einen kreisrunden Wulstrand 23 und vier hakenförmige Federarme 22 aufweist, die durch die Öffnungen 101, 102 greifen und sich hinter den Kanten der Öffnung verhaken. Der Wulstring dient dabei der Abdichtung.Each of the openings in the housing 1 can be closed by a circular cover 2 made of plastic, which for this purpose has on the inside a circular bead 23 and four hook-shaped spring arms 22 which reach through the openings 101, 102 and get caught behind the edges of the opening. The bead ring serves as a seal.

Auf der Vorderseite weist der Deckel 2 koaxiale Einkerbungen a bis f auf, durch die ein kreisförmiger Innenteil 20 und konzentrische Kreisringe 21 gebildet werden. Jede der Einkerbungen begrenzt somit eine der möglichen Öffnungsquerschnitte.On the front, the cover 2 has coaxial notches a to f, through which a circular inner part 20 and concentric circular rings 21 are formed. Each of the notches thus limits one of the possible opening cross sections.

In Fig. 4 ist der Druckabfall %P (Ordinate) über dem Abluftvolumenstrom V (Abszisse) aufgetragen, wobei die Anzahl der abgedeckten Öffnungen bzw. die jeweils zum Einsatz kommende Schneidrille als Parameter am oberen Rand angegeben ist. Daraus ist ersichtlich, daß sich einerseits Volumenströme bis zu 500 m3 pro Stunde bei einem Druckabfall von 30 Pascal bewältigen lassen (alle Öffnungen offen), daß aber trotzdem auf bei einem so niedrigen Volumenstrom wie 20 m3 pro Stunde immer noch ein Druckabfall von mehr als 20 Pascal erreichbar ist. In letzterem Fall sind neun Öffnungen vollständig verschlossen und im Deckel der zehnten Öffnung ist das mittlere Teilstück 20 herausgeschnitten, so daß die Durchtrittsöffnung durch die Einkerbung f bestimmt ist.4, the pressure drop% P (ordinate) is plotted against the exhaust air volume flow V (abscissa), the number of openings covered or the cutting groove used in each case being indicated as a parameter at the upper edge. From this it can be seen that, on the one hand, volume flows of up to 500 m 3 per hour can be managed with a pressure drop of 30 Pascal (all openings open), but nevertheless that with a volume flow as low as 20 m 3 per hour there is still a pressure drop of more than 20 Pascal can be reached. In the latter case, nine openings are completely closed and the middle section 20 is cut out in the lid of the tenth opening, so that the passage opening is determined by the notch f.

Claims (3)

1. Ventilated light for a low-pressure cover, comprising a housing (1) which has ventilating openings (101, 102) of identical shape and size which can be closed either completely or partially by synthetic components, and comprising two side reflectors (142, 143) which are arranged in the housing on both sides of a fluorescent lamp (10) and which between one another define the light outlet opening (13) below and the air throughput opening (140) above, characterised in that the side reflectors (142, 143), together with a roof reflector (141) arranged between them, form a channel shaped reflector enclosing the fluorescent lamp (10) and the upper third portion of which is provided with a longitudinal slot (140) between the roof relfector (141) and each side reflector (142, 143), that at least two, preferably ten, ventilation openings (101, 102) are arranged in the side walls (11, 12) of the housing (1), each of which openings has a minimum cross-section of 20 cm2 and which are uniformly distributed along the length of the housing (1), and that the ventilation openings (101, 102) can be closed by means of snap-fitted covers (2) which consist of synthetic material and which have components (20, 21) which can be cut out and which are delimited from one another by grooves (a to f).
2. Ventilated light as claimed in claim 1, characterised in that the ventilation openings (101, 102) are uniformly distributed over both side walls (11, 12) of the housing (1).
3. Ventilating light as claimed in claim 1 or 2, characterised in that the ventilation openings (101, 102) and the covers (2) are circular whereas the grooves (a to f) are coaxial.
EP81102437A 1980-04-03 1981-03-31 Combined lighting and air exhaust device for an underpressure ceiling Expired EP0037958B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81102437T ATE3669T1 (en) 1980-04-03 1981-03-31 EXHAUST LIGHT FOR A VACUUM CEILING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3013147A DE3013147C2 (en) 1980-04-03 1980-04-03 Exhaust air light for a negative pressure ceiling
DE3013147 1980-04-03

Publications (2)

Publication Number Publication Date
EP0037958A1 EP0037958A1 (en) 1981-10-21
EP0037958B1 true EP0037958B1 (en) 1983-06-01

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ID=6099308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102437A Expired EP0037958B1 (en) 1980-04-03 1981-03-31 Combined lighting and air exhaust device for an underpressure ceiling

Country Status (5)

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EP (1) EP0037958B1 (en)
AT (1) ATE3669T1 (en)
DE (1) DE3013147C2 (en)
FI (1) FI65138C (en)
ZA (1) ZA812211B (en)

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US8616842B2 (en) 2009-03-30 2013-12-31 Airius Ip Holdings, Llc Columnar air moving devices, systems and method
US9151295B2 (en) 2008-05-30 2015-10-06 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
US9335061B2 (en) 2008-05-30 2016-05-10 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
US9459020B2 (en) 2008-05-30 2016-10-04 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
USD783795S1 (en) 2012-05-15 2017-04-11 Airius Ip Holdings, Llc Air moving device
USD805176S1 (en) 2016-05-06 2017-12-12 Airius Ip Holdings, Llc Air moving device
USD820967S1 (en) 2016-05-06 2018-06-19 Airius Ip Holdings Llc Air moving device

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Publication number Priority date Publication date Assignee Title
DE9316234U1 (en) * 1993-10-23 1994-01-13 Heymann, Hans-Helmut, 30926 Seelze Device for removing smoke
US20120195749A1 (en) 2004-03-15 2012-08-02 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
DE102013216127B4 (en) * 2013-08-14 2015-03-19 Eberspächer Climate Control Systems GmbH & Co. KG Flow damper, in particular for air flow attenuation in an air duct system of a vehicle
US10024531B2 (en) 2013-12-19 2018-07-17 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
US9702576B2 (en) 2013-12-19 2017-07-11 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
US10221861B2 (en) 2014-06-06 2019-03-05 Airius Ip Holdings Llc Columnar air moving devices, systems and methods
US10487852B2 (en) 2016-06-24 2019-11-26 Airius Ip Holdings, Llc Air moving device
USD886275S1 (en) 2017-01-26 2020-06-02 Airius Ip Holdings, Llc Air moving device
USD885550S1 (en) 2017-07-31 2020-05-26 Airius Ip Holdings, Llc Air moving device
USD887541S1 (en) 2019-03-21 2020-06-16 Airius Ip Holdings, Llc Air moving device
CA3136808A1 (en) 2019-04-17 2020-10-22 Airius Ip Holdings, Llc Air moving device with bypass intake

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DE7135369U (en) * 1972-07-06 Siemens Ag Exhaust light
DE7309803U (en) * 1973-09-27 Licentia Gmbh Air volume regulation device on ventilation lights or the like
GB944846A (en) * 1960-08-11 1963-12-18 Emerson Electric Mfg Co Apparatus for combining air supply and exhaust with lighting equipment
DE1489531A1 (en) * 1965-12-29 1969-04-03 Siemens Ag Recessed ceiling light for an air-conditioned room
DE6752685U (en) * 1968-09-12 1969-03-13 Licentia Gmbh AIR FLOW REGULATION DEVICE.
CH570589A5 (en) * 1973-08-07 1975-12-15 Siemens Ag Regulating orifice for air conditioning ducts - has cutting grooves along tapered section for ease of adjustment
DE7735798U1 (en) * 1977-11-23 1978-08-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt VENTILATION LAMP WITH MEANS FOR CHANGING THE EXHAUST AIR SECTION
DE2757060C3 (en) * 1977-12-21 1981-12-10 Schako Metallwarenfabrik Ferdinand Schad Gmbh, Zweigniederlassung Kolbingen, 7201 Kolbingen Exhaust air guiding device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9151295B2 (en) 2008-05-30 2015-10-06 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
US9335061B2 (en) 2008-05-30 2016-05-10 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
US9459020B2 (en) 2008-05-30 2016-10-04 Airius Ip Holdings, Llc Columnar air moving devices, systems and methods
US8616842B2 (en) 2009-03-30 2013-12-31 Airius Ip Holdings, Llc Columnar air moving devices, systems and method
USD783795S1 (en) 2012-05-15 2017-04-11 Airius Ip Holdings, Llc Air moving device
USD805176S1 (en) 2016-05-06 2017-12-12 Airius Ip Holdings, Llc Air moving device
USD820967S1 (en) 2016-05-06 2018-06-19 Airius Ip Holdings Llc Air moving device

Also Published As

Publication number Publication date
ZA812211B (en) 1982-04-28
ATE3669T1 (en) 1983-06-15
DE3013147C2 (en) 1983-02-17
FI65138B (en) 1983-11-30
DE3013147A1 (en) 1981-10-08
FI811036L (en) 1981-10-04
EP0037958A1 (en) 1981-10-21
FI65138C (en) 1984-03-12

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