DE29502292U1 - Luminaire, in particular clean room luminaire - Google Patents

Abstract

The light has a tub-shaped base housing to contain fittings, especially to hold fluorescent tubes. It has a cover to close off the open side of the housing, which is transparent at least in the area of the tubes, and is at least partly sunk into a recess (16) in the housing. The cover has a device for fastening it and releasing it from the housing. A sealing strip (11) is arranged in a gap (29) between the outer circumferential surface (28) of the cover and the inner circumferential surface (17) of the recess. The gap is filled or almost completely filled by the strip, and its outer side in the region of the gap aligns or nearly aligns with the outer surfaces of the cover which encloses these and of the housing.

Description

13 February 1995

Luminaire, especially cleanroom luminaire

The invention relates to a lamp according to the preamble of claim 1 or 15.

A lamp is an object that not only serves to illuminate the room it is in, but the outer surfaces of the lamp also form the boundary surfaces for the room it is in. This applies to a lamp arrangement in the built-in version as well as in the surface-mounted or attached version and also when the lamp is suspended. Therefore, joints or gaps in the housing can form sources of dirt if dirt or dust accumulates in the joints or gaps, which is almost impossible to avoid in a work room. In addition, these dirty spots can form bacterial colonies that affect the room. This is particularly true for a so-called clean room in which dirt or contamination by bacteria or the like is undesirable, as is the case in an operating room, sterilization room, isolation room or production room for the food industry or precision objects, for example.

A cleanroom light in particular often needs to be cleaned, which can be done by wiping or spraying with water, for example. The cleaning agent, such as water, can penetrate into the joints and gaps and remain as the dirt or foreign matter described above, which is undesirable for the reasons mentioned above.

In a known clean room lamp, the housing of which consists of a trough-shaped base housing part and a cover attached to it, the cover is recessed into a recess in the housing to such an extent that the outer surface of the cover and the outer surface of the housing are approximately flush with one another. In order to prevent gaseous substances or water or moisture, even small particles such as dust, from migrating from the room into the housing or vice versa, a seal is arranged between the cover and the housing, which rests on two opposite sealing surfaces extending parallel to the plane of the cover. Between the outer peripheral surface of the cover and the

In this known design, there inevitably remains a gap on the opposite peripheral surface of the recess, into which dirt can penetrate in the manner described above.

The fastening device effective between the cover and the base housing part is formed in this known lamp by a quick-release fastener in the form of several clamping pins distributed around the circumference of the cover, which pass through the cover and an inner flange of the base housing part in corresponding holes and engage behind the inner flange with locking elements that can be clamped behind the inner flange by a quarter turn and released again by turning back. The clamping pins have heads accessible from the outside of the cover with tool engagement elements on which the clamping pins can be gripped for the purpose of rotation. This known design also has the disadvantage described above, because there are gaps or gaps between the heads of the clamping pins and the cover into which the aforementioned contamination can penetrate.

The invention is based on the task of ensuring that no more dirt can accumulate in the places mentioned in a lamp of the type specified at the beginning.

This object is solved by the features of claim 1 or 15.

Advantageous developments of the invention are described in the subclaims.

In the lamp according to the invention according to claim 1, the sealing strip is arranged between the outer peripheral surface of the cover and the inner peripheral surface of the recess opposite it in such a way that it is flush with the outer end of the gap and is elastically compressed between the outer peripheral surface of the cover and the opposite peripheral surface of the recess. This not only ensures that the gap is sealed, but also that the gap is filled by the seal, so that there is no gap cavity into which dirt could penetrate.

It is advantageous to make the outer peripheral surface of the cover convergent towards the inside, preferably conical. This not only makes assembly easier when inserting the cover, because the convergent outer peripheral surface

Not only does the sealing strip not only form a run-on slope that facilitates the positioning of the outer peripheral surface in the sealing strip, but when the cover is inserted, the part of the sealing strip that is in contact with this surface is displaced outwards due to the convergent outer peripheral surface and is pressed between the contact surfaces for the sealing strip that are opposite one another in the plane of the cover and is elastically compressed if necessary.

Furthermore, it is advantageous, particularly when the sealing strip is seated in an annular recess, to provide an annular wedge with a convergent outer circumferential surface and a divergent inner circumferential surface on the cover, which preferably presses approximately centrally into the sealing strip and presses it not only into the base of the annular groove, but also against the side surfaces of the annular groove and preferably elastically compresses the sealing strip.

In the embodiment according to the invention according to claim 15, the relevant gaps emerging on the outer surface of the lid in the area of the fastening device are completely eliminated. Despite the inwardly offset arrangement of the fastening device, the lid can be opened and closed easily because the fastening device is formed by a plug connection, the plug connection parts of which automatically engage with one another when the lid is inserted into the recess and are released when the lid is removed by means of a force that overcomes the engagement.

Preferably, the lid does not have any attached or molded gripping elements for removing or opening the lid, as such gripping elements could form gaps that are undesirable. Such a lid without such gripping elements can be gripped and opened using at least one, preferably two, suction cups attached to its outer surface, as are known and customary in the handling of glass panes. 30

The subclaims contain features which, on the one hand, improve the filling and sealing of the gap and, on the other hand, improve the fastening device effective between the cover and the base housing part and its handling or the insertion and removal of the cover and also lead to simple, cost-effective, functional and small designs.

The invention and other advantages that can be achieved through it are explained below using preferred embodiments and drawings. It shows:

Fig. 1 shows a lamp according to the invention in side view, partly in section; 5

Fig. 2 shows the section Π-Π in Fig. 1;

Fig. 3 shows the section Πλ-λ in Fig. 1 in a modified design of the lamp; Fig. 4 shows the detail marked with X in Fig. 3 in an enlarged view.

The main parts of the lamp 1 are a tub-shaped, in the present embodiment cuboid-shaped base housing part 2 with an opening 3 on its underside, a cover 4 with which the opening 3 can be closed, one or more sockets 5 arranged in the base housing part 2 for one or more, e.g. two lamps, in particular fluorescent tubes 6, a reflector 7, a fastening device generally designated 8 for releasably fastening the cover 4 to the base housing part 2 and a sealing device 9 with a sealing strip 11 for sealing and in the present case also filling a gap or joint between the cover 4 and the edge of the base housing part 2 surrounding the opening 3.

The cuboid-shaped and elongated base housing part 2 consists of a top wall 12, two opposing broad side walls 13, two opposing end walls 14 and a horizontal ring base 15 extending inwards from the latter, on the inner edge of which a raised channel 16, i.e. protruding into the housing interior, is formed in one piece in the shape of an upside-down U, which consists of an outer side wall section 17 extending vertically upwards from the ring base 15, a bottom wall section 18 extending horizontally inwards from the latter and an inner side wall section 19 extending vertically downwards from the latter. The height a of the outer side wall section 17 is larger, here approximately twice as large as the height b of the inner side wall section 19. The sealing strip 11 is adapted in its cross-sectional dimensions, taking into account the height a, to the cross-sectional dimensions and the cross-sectional shape of the channel extending around the opening 3 and is inserted therein, whereby it can be held therein by a clamping effect between the side wall sections 17, 19.

and/or can be secured therein by gluing. The shape of the opening 3 is rectangular, with its longitudinal and transverse dimensions corresponding to the longitudinal and transverse dimensions of the base housing part 2, so that the width of the ring base 15 is approximately the same over the entire circumference.
5

Due to the presence of the groove 16 and its shortened inner side wall section 19 as well as the compressibility of the sealing strip 11 or its free space that accommodates the cover 4, here the outer frame web 25, a recess 20 is formed on the underside of the housing, in which the cover 4 is inserted.

The cover 4 consists of a cover frame 21 which engages under the channel 16 and on the inner edge of which a pane 22 made of translucent material such as glass or plastic is tightly arranged and secured, e.g. by gluing.

In the present embodiment, the cover frame 21 has the cross-sectional shape of an upside-down T, whereby the frame part formed by the vertical frame leg 23 extends into the opening 3 with play, the outer, approximately horizontal frame web 24 engages under the channel 16 and the inner frame web 25 carries the pane 22. The cover frame 21 can be a one-piece component all the way around in its square shape or it can consist of four frame sections which are assembled in the four corners, for example mitred, abut against one another and connected to one another. In both the split and the one-piece version, the cover frame 21 can consist of metal, in particular castable metal such as zinc or preferably aluminum or plastic, whereby in the split version the individual frame parts can be formed by profile sections. The frame parts can be connected to one another by corner connectors 26, which are inserted into undercut grooves 27 on the inside of the frame leg. To improve stability, two corner connectors arranged one above the other can be arranged in two grooves 27 arranged one above the other.

The sealing device 9 fulfils two functions, namely, on the one hand, the sealing and, on the other hand, the filling of the gap 29 extending in the plane between the outer peripheral surface 28 of the cover frame 21 and the inner peripheral surface, namely the outer side wall section 17. The latter is achieved by the outer peripheral surface 28 preferably being in the form of a conical surface for

The inner space of the base housing part 2 is convergently shaped. As a result, when the cover 4 is inserted, the section 31 of the sealing strip 11 in contact with the convergent outer peripheral surface 28 is pressed and compressed outwards against the outer side wall section 17 in the plane of the cover, so that this sealing strip section 31 completely fills the gap 29. The arrangement is such that the ring base 15, the sealing strip section 31 and the frame web 24 are flush with one another on the underside, i.e. lie in one plane. The outer frame web 24 preferably has a rounded or preferably triangular ring web 32 on its inside, the outer surface of which is formed by the outer peripheral surface 28 and the inner surface of which is an inner peripheral surface 33 that diverges with respect to the housing interior, in particular an inner conical surface. The angle W enclosed by the outer circumferential surface 28 and the inner circumferential surface 33 is preferably approximately 60°, with the angle bisector running approximately vertically. The inner edge of the frame web is preferably formed with a tapered surface 25a in order to avoid a dirt corner. The smallest width 29a of the gap 29 is approximately 2 mm to 4 mm.

The sockets 5 each have a conventional socket piece 34 with electrical contacts for the associated fluorescent tube 6. The socket piece 34 is attached on the inside to an approximately vertical leg 35a of an angle-shaped socket support 35, the horizontal, inward-facing foot leg 35b of which is attached to the inside of the ceiling wall 12, e.g. by rivets. 30 designates an elastic, tight cable feed-through sleeve.

The roof-shaped reflector 7, which spans the at least one fluorescent tube 6, is fastened in its two end regions to the inside of the ceiling wall 12 by a preferably Z-shaped holder 36, the leg 36a of which facing the reflector 7 is fastened, preferably screwed, to the partially flat ridge section of the reflector 7, and the outer leg 36b of which is preferably connected to the foot leg 35b or formed thereby and thus formed in one piece with the socket carrier 35. The side sections 7b of the reflector 7, which extend divergently downwards from the ridge section 7a, can be formed by flat side sections 7b1, 7b2 bent approximately in the middle at a vertex line 7c. The side sections 7b are stabilized at their free edges by short, outwardly angled legs 7d. The side sections 7d extend to the vicinity of the pane 22.

In the modified design of the reflector 7 according to Fig. 3, it consists of two separate side parts 7e that are opposite one another and are slightly curved in an S-shape and arranged in mirror image to one another. In their lower area, the side parts 7e are slotted in the area of cross slats 37a, 37b and are attached to the latter, which are arranged at predetermined intervals in the longitudinal direction of the lamp 1, whereby the outer cross slats 37b can be designed somewhat higher than the inner cross slats 37a, as shown in Fig. 3. The side parts 7e can be anchored to the cross slats 37a, 37b and thus form a structural unit that stands on the pane 22 and can be fixed or anchored to the cover frame 22 against horizontal displacement in a manner not shown. The side parts 7e can be stabilized at their free ends by short bends 7f.

Between the upper ends of the side parts 7e, a preferably horizontal ridge section 7g can be arranged, which can be U-shaped with upright legs 7h for its stabilization and can be fastened to the holders 36, as has already been described with regard to the reflector 7 according to Fig. 1 and 2.

The fastening device 8 is formed by several quick-release fasteners, here four plug-in connection devices 41, two of which are arranged off-center on each broad side of the lamp 1, preferably close to the ends of the lamp 1, opposite one another. Each plug-in connection 41 has a plug-in bracket 43 that is elongated in the vertical direction and - viewed along the vertical longitudinal center plane 42 - flat, and a correspondingly shaped and arranged plug-in slot 44, into which the plug-in bracket can be inserted and releasably fastened in the inserted position by clamping or locking.

In the present embodiment, in which the plug connections 41 are arranged identically or in mirror image to one another and therefore only one plug connection 41 is described, the plug bracket 43 is held at its lower end transversely to the longitudinal center plane 42 on the cover 4, in particular on the frame leg 23, so that it can pivot. The plug slot 44, on the other hand, is formed on the base housing part 2, namely on an inner plug connection part 45, which is yet to be described.

The bracket 43 is made of spring wire 46 in the form of a fork that is open at the bottom, and it consists of an upper, preferably horizontally extending ridge section 43a, from the ends of which two side sections 43b extend downwards.

extend, which initially diverge at an angle in the area of side section parts 43c and then converge at an angle in the area of side section parts 43d and then extend downwards approximately parallel. At their lower end areas, the side sections 43b are initially angled inwards with first legs 43e, then towards each other with second legs 43f, the latter ending at a distance from each other. With these legs 43e, 43f, the plug-in bracket 43 is inserted into vertical transverse slots 47 of the frame leg 23, the second legs 43f engaging behind the frame leg 23 on the inside or in a groove 27a.

The side sections 43c and 43d each form two opposing locking lugs 48, the distance c between which is slightly larger than the length d of the slot 44.

The insertion slot 44 is arranged at such a height f from the underside of the base housing part 2 that, in the closed position of the cover 4, the slot ends in the middle area of the side part sections 42d rest against them. The insertion slot 44 is arranged in a horizontal leg 49 which is fastened to a hollow block 51 in a U-shape, preferably by means of a vertical leg 49b. The hollow block 51 can extend from the bottom wall section 18 to the ceiling wall 12 and horizontally from the leg 49a to the associated side wall 13 and be fastened thereto, e.g. by spot welding, if the associated parts are made of metal, in particular sheet steel.

Preferably, a second fastening device 55 for the cover 4 is provided between the cover 4 and the base housing part 2, which allows the cover 4 to be suspended in an intermediate position below its closed position, preferably in a position folded down by 90°, so that it is possible to carry out service or repair work in this intermediate position, e.g. replacing a starter or ballast 56 attached to the base housing part 2, without having to completely dismantle the cover 4 and put it aside. This second fastening device 55 is preferably integrated into the first fastening device 8, whereby the second fastening device 55 can only be assigned to one side, i.e. to two plug connections 41 arranged on one side. In the present embodiment, the second fastening device 55 is assigned to each plug connection 41. Since the design features associated with each plug connection 41 are identical to one another, the second fastening device 55 is described below only in the area of one plug connection 41.

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The plug-in bracket 43 is used as the cover-side part of the second fastening device 55. A hook-shaped hanger 56 is arranged on it in the lower area of the edge of the opening 3 below the plug-in slot 44, preferably in such a protruding manner that when the cover 4 is lowered, the ridge section 43a of the plug-in bracket 43 automatically reaches the hanger 56. In this position, the cover 4 is lowered by approximately the height h of the plug-in bracket 43. On the opposite broad side, the plug-in brackets 43 are not guided onto the associated hangers 56, so that the cover 4 can pivot downwards by approximately 90° when hung on the two hangers 56 on one broad side, which makes the opening 3 easily accessible.

The hanger 56 can be formed by an angle piece with a horizontal leg 56a attached to the hollow block 51 and an upright leg 56b. The hanger 56 is preferably assigned a closure element 57 which prevents the associated plug-in bracket 43 from being accidentally unhooked. According to the present embodiment, the closure element 57 is formed by a tongue 57a extending from top to bottom and held on the hollow block 51, which is preferably formed by an angled or Z-shaped extension of the horizontal leg 49a. The hanger 56 and the tongue 57a are narrower than the plug-in bracket 43 so that they can extend between the side sections 43b.

To assemble the cover 4, the plug-in brackets 43 with their ridge sections 43a are hung from the inside on the hangers 56, whereby the associated tongue 57b gives way and springs back into its closed position due to its spring elasticity. Then the cover is pushed further up in its horizontal arrangement, whereby the ridge sections 43a slide along the inside of the tongues 57b and are inserted into the plug-in slots 44. By applying a certain amount of force when pushing it further up, the locking lugs 48 are bent against their existing elasticity, whereby they bend out again after reaching through the plug-in slots 44 and reach behind the slot ends with their convergent or slanted locking flanks 43d. Due to the elastic spreading force of the side sections 43d, an upwardly directed force component K is also exerted on each bracket 43, which causes the previously described lateral compression of the sealing sections 31 or - if the cover 4 is manually lifted into this position, prevents the cover 4 from being lowered and thus ensures that the cover 4 is locked in this position.

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To open the lid 4, one or two suction heads 59, each with a handle, which are known per se for handling glass panes and are shown in outline, are used. These are placed on the underside of the pane 22 so that it can be pulled downwards and an opening force can be exerted on the lid 4, which, after the locking lugs 48 have been bent in, enables it to be lowered into the previously described intermediate position, from which the lid 4 can be folded down on one side after the plug-in brackets have been unhooked, or removed on the other side after being unhooked.

The lamp 1 is also assigned a known breathing pot 61 with a breathing nozzle 62, which, in the event of differences between the external and internal pressure, enables an exchange of air through the breathing nozzle 62 and an air opening 63 in the base housing part 2, whereby the breathing nozzle 62 prevents the passage of water or other particles.

The lamp 1 described above is ideal for a so-called clean room, because there are no gaps on its outside through which contaminants can penetrate. To clean it, the lamp 1 can be hosed down in its installed position without the problem described at the beginning occurring.

The lamp 1 described above can be designed as a so-called surface-mounted or attached version. It can be screwed to a ceiling or wall using the top of the base housing part 2. In the present design, this is done using support pieces 64 with through holes for fastening screws that are arranged on the ceiling wall 12 and fastened or formed thereon.

However, the luminaire 1 can also be designed in a so-called built-in version with fastening elements in its lower peripheral area, which enable the luminaire 1 to be installed in a wall or ceiling, in which the luminaire with its pane 22 or with the outer surface of the cover frame 21 is approximately flush with the wall or ceiling or protrudes slightly.

The sealing strip 11 can have a round or preferably square initial cross-sectional shape in the relaxed state if it is made of a correspondingly soft elastic material. However, it can also have a ring recess corresponding to the shape and size of the frame web 24 with or without the ring web 32, which can be dimensioned with excess if the sealing strip is made of

11

elastically compressible material or can be dimensioned without excess if the material is pressed firmly and essentially only against the sealing surfaces.

5 The individual parts of the lamp 1 or the base housing part 2 are made of metal, in particular steel or aluminium, or plastic.

Claims (22)

Expectations 1. Luminaire (1), in particular clean room luminaire, consisting of - a trough-shaped base housing part (2), - one or more lamps, in particular fluorescent tubes (6), held in the base housing part (2) by means of at least one socket (5), - a cover (4) closing the open side of the base part (2), which consists at least in the area of the lamps of translucent material and is at least partially recessed in a recess (16, 20) of the base housing part (2), - a circumferential sealing strip (11) between the cover (4) and the base housing part (2) and - a fastening device (8) for releasably fastening the cover (4) to the base housing part (2) characterized, that the sealing strip (11) is in a gap (29) between the outer peripheral surface (28) of the cover (4) and the inner circumferential surface (17) of the recess (16) and completely or almost completely fills the gap (29), and that the outer side of the sealing strip (11) in the region of the gap (29) is flush or almost flush with the surrounding outer surfaces of the cover (4) and the base housing part (2). 2. Lamp according to claim 1, characterized in that the outer peripheral surface (28) of the cover (4) is convergent, in particular conical, with respect to the interior of the base housing part (2). 3. Lamp according to claim 1 or 2, characterized in that an annular web (32) is arranged on the inside of the cover (4), the outer peripheral surface of which is formed by the convergent outer peripheral surface (28). 4. Lamp according to claim 3, characterized in that the inner peripheral surface (33) of the annular web (32) is designed to be divergent, in particular hollow conical, with respect to the interior of the base housing part (2). 5. Lamp according to claim 4, characterized in that the convergent outer peripheral surface (28) and/or the divergent inner peripheral surface (33) enclose an acute angle of approximately 30° with the vertical central axis of the lamp (1). 6. Lamp according to one of the preceding claims, characterized in that the sealing strip (11) is arranged, in particular glued, in a recess or annular groove (16). 7. Luminaire according to claim 6, characterized in that the recess or Ring groove (16) is integrally formed on an annular base (15) of the base housing part (2). 8. Lamp according to claim 6 or 7, characterized in that the height of the sealing strip (11) corresponds to the depth of the recess or annular groove (16). 9. Lamp according to one of the preceding claims, characterized in that the recess (16) is arranged at a distance from the peripheral wall (13, 14) of the base housing part (2). 10. Lamp according to one of the preceding claims, characterized in that the cover (4) has a flat cover frame (21), the inner frame web (25) carries a pane (22) made of translucent material and whose outer frame web (25) engages under the recess (16). 11. Lamp according to claim 10, characterized in that the cover frame (21) has on its inside a preferably integrally formed frame leg (23) which extends through the opening (3) into the base housing part (2). 12. Lamp according to one of the preceding claims, characterized in that the base housing part (2), the sealing strip (11) and the cover (4) are approximately flush with one another on the outside or lie in one plane. 13. Lamp according to one of the preceding claims, characterized in that the smallest width of the gap (29) on the associated outer surface of the housing is approximately 2 mm to approximately 4 mm. 14. Lamp according to one of the preceding claims, characterized in that the sealing strip (11) consists of soft elastic material. 15. Luminaire (1), in particular clean room luminaire, consisting of - a trough-shaped base housing part (2), - one or more lamps, in particular fluorescent tubes (6), held in the base housing part (2) by means of at least one socket (5), - a cover (4) closing the opening (3) which is at least in the area the lamps are made of translucent material and are at least partially sunk into a recess (16, 20) of the base housing part (2), - a sealing strip (11) between the cover (4) and the base housing part (2) and - a fastening device (8) for releasably fastening the cover (4) to the Base housing part (2) and/or lamp (1) according to one of the preceding claims, characterized in that the fastening device (8) is arranged on the inside of the cover (4) and is formed by mutually opposing plug-in connection devices (41) which automatically engage when the cover (4) is closed and can be released from their engagement by applying a certain amount of force when the cover (4) is opened. 16. Luminaire according to claim 15, characterized in that four Plug connection devices (41) are arranged on both sides of the longitudinal center plane (42) of the lamp (1). 17. Lamp according to claim 15 or 16, characterized in that the mutually identical or mirror-image plug-in devices are each formed by a flat bracket (43) arranged parallel to the associated peripheral wall (13) of the base housing part (2) with one or two elastically bendable locking lugs (48) on one side or on both sides with convergent starting flanks (43c) and a receiving slot (44) in the bracket (43), behind the slot end or ends of which the locking lugs (48) engage. 18. Lamp according to claim 17, characterized in that the locking flanks (43d) of the locking lugs (48) extend divergently, in particular obliquely or graduatedly obliquely. 19. Lamp according to claim 17 or 18, characterized in that the brackets (43) are held on the cover (4), preferably pivoted outwards and the Receiving slots (44) are arranged on an inner attachment part (49, 51) of the base housing part (2). 20. Lamp according to one of the preceding claims, characterized in that the cover (4) is assigned holding devices (55) in an open, in particular 90° tilted intermediate position, which are preferably each integrated in at least two plug connection devices (41). 21. Luminaire according to claim 20, characterized in that the holding devices (55) is each formed by a hook-shaped suspension strap (56b) for the bracket (43), which is arranged in the lower region of the base housing part (2) within the opening (3). 22. Lamp according to claim 21, characterized in that the suspension member (56b) is assigned a securing member (57a), in particular a spring tongue for securing the bracket (43) located on the suspension member (56b), the securing member (57a) being pre-tensioned into its securing position by the force of a spring.