US 3868502 A
The invention relates to a luminaire comprising a base and a housing which is pivotally secured thereto and in which a lampholder is arranged. The hinge construction is present at the edge of the bottom of the housing. The housing comprises a cylindrical socket which is axially movable relative to the housing on which a reflector may be mounted.
Claims available in
Description (OCR text may contain errors)
United States Patent [191 Beeren et al.
[4 1 Feb. 25, 1975 1 LUMINAIRE  Inventors: Aloysius Jacobus Maria Beeren;
l-lenricus Karel Jozef Stoffelen, both of Emmasingel, Netherlands  Assignee: U.S. Philips Corporation, New
22 Filed: Nov. 5, 1973 211 App]. No.: 412,705
 Foreign Application Priority Data Nov. 29, 1972 Netherlands 7216165  U.S. Cl 240/44.l, 240/61, 240/73 R, 240/78 B, 240/81 BC  Int. Cl. F2lv 7/00  Field of Search 240/44, 44.1, 44.2, 47, 240/52, 61, 61.11, 61.12, 73 R, 81 BC, 41.6,
 References .Cited UNITED STATES PATENTS 2,069,950 2/1937 Greppin 240/42.2 X
2,362,603 11/1944 Wittel 240/44 2,884,513 4/1959 Giller 3,388,246 6/1968 Bailey 3,428,798 2/1969 Hilzen 3,465,140 9/1969 Goldsmith 240/47 X Primary Examiner-John M. Horan Assistant Examiner-Alan Mathews Attorney, Agent, or FirmFrank R. Trifari  ABSTRACT The invention relates to a luminaire comprising a base and a housing which is pivotally secured thereto and in which a lampholder is arranged. The hinge construction is present at the edge of the bottom of the housing. The housing comprises a cylindrical socket which is axially movable relative to the housing on which a reflector may be mounted.
1 Claim, 5 Drawing Figures $868,502 sum 10? 3 J PATENIEUFEHZS ms Pmmmrwzs ms 7 3.868.502
sum 2 9f 3 I m i Ii 23 l 27 4, 31 5 w tk-zz 20 g Z \l Lljlll mf WN 141111 2 18 i i I I 1 16 13 17 11 fl/ 12 LUMINAIRE The invention relates to a luminaire which comprises a cylindrical housing and a base, in which housing a lampholder is arranged which is designed to receive a lamp, said housing furthermore comprising, on its side remote from the lampholder, a bottom portion which is connected to the base by means ofajoint. Such a luminaire is known.
In the known luminaire the joint is a ball joint which is arranged in the longitudinal axis of the cylindrical housing. Said central arrangement of the ball joint occupies a large part of the surface of the bottom portion of the housing. The result of this is that in the known luminaire the connection of the lampholder in the housing is not realised by means of a simple bolt and nut joint projecting through the bottom portion, but by means of a clamping joint to the cylinder wall of the housing. A further drawback of the known luminaire is that with the central arrangement of the joint a large chink must be present between the bottom portion of the housing and the base of the luminaire so as to ensure a great mobility. As a result of said large chink, the longitudinal dimension of the luminaire is larger than is desirable.
It is the object of the invention to provide a luminaire which does not exhibit said drawbacks.
The luminaire according to the invention is therefore characterized in that the joint is a hinge which is present at the edge of the bottom portion of the housing. With this arrangement of the hinge, the central part of the bottom portion remains accessible for the connection of the lampholder. The advantage of the admissibility in behalf of assembly purposes also holds good of course for the central part of the side of the base facing the bottom of the housing; this is of importance in particular when the base comprises a disc which can be secured to a wall or ceiling and is rotatable about a central axis. Because according to the invention the joint is constructed as a hinge, the chink between the housing and the base is very small.
A favourable embodiment of the luminaire according to the invention is characterized in that a number of vent holes are recessed in the cylinder wall of the housing. One or more vent holes are preferably also recessed in the bottom portion of the housing. As a result of the presence of said vent holes, the dimensions of the luminaire can be maintained small without this resulting in inadmissibly high temperatures.
A further favourable embodiment of the luminaire according to the invention is characterized in that the cylindrical housing is formed by a cylindrical tub and a member secured to said tub, said member comprising a central portion on which the lampholder is mounted, said member furthermore comprising a cylindrical side wall which joins the cylinder wall of the tub, the vent holes being provided in the cylindrical side wall of the member. Due to said construction of the housing of two components, namely a cylindrical tub and the said member, the housing can be manufactured by a simple injection moulding process.
The zone of the member which is present between the cylindrical side wall and the central part of the member preferably comprises one or more vent holes. As a result of the presence of said vent holes and those present in the bottom and the side wall of the housing, a chimney effect occurs in the housing which ensures a good cooling of the material of the housing and the lampholder.
Another embodiment of the luminaire according to the invention is characterized in that a cylindrical socket is secured to the cylindrical side wall of the member and is movable in the axial direction relative to the housing. The mobility of the socket in the axial direction of the housing is preferably achieved in that the socket comprises an inwardly directed projection cooperating with a helically extending slot occuring in the cylindrical side wall ofthe member. When the luminaire is used for a so-called mirror lamp, for example. a compressed glass lamp, of which the part of the lamp envelope adjoining the base and being. for example. parabolic comprises a reflecting layer, said mobility of the socket is advantageous because said socket or a sleeve fitting thereon can be placed against the rear wall of the mirror lamp. As a result of this a good support of the lamp is achieved. When the luminaire is used for a normal lamp or a so-called top-mirror lamp, a reflector may be secured to the socket. Due to the mobility ofthe socket relative to the housing and hence also relative to the lampholder, the desired light beam pattern may be adjusted.
In behalf of a reflector which can be clamped to the socket, the socket according to an embodiment of the luminaire according to the invention comprises at least one upright ridge which extends coaxially with the socket and the height of which taken from the side of the socket facing the base to the other side of the socket decreases.
In order to facilitate the movement of the socket, a part of the outer wall of the socket is preferably milled coaxially with the socket.
The invention will be described in greater detail with reference to the drawing which shows an embodiment of the luminaire according to the invention.
FIG. 1 is a perspective view of the luminaire in which the socket and the sleeve are only partially shown.
FIG. 2 is a longitudinal cross-sectional view of the luminaire in which the luminaire cooperates with a topmirror lamp and a reflector.
FIG. 3 is an underneath view taken on the line llIllI of the bottom of the housing of the luminaire shown in FIG. 2.
FIG. 4 is a cross-sectional view taken on the line IVIV of the socket of FIG. 2.
FIG. 5 is a cross-sectional view taken on the line VV of the socket shown in FIG. 4.
As shown in FIGS. 1 and 2, the luminaire according to the invention comprises a cylindrical housing and a base 2. Arranged in the housing 1 is a lampholder 3 which is secured by means of bolts 4 and nuts 5 and in which arbitrarily a so-called mirror lamp 6 (FIG. 1), a top-mirror lamp 7 (FIG. 2) or another suitable incandescent lamp can be provided. The parabolically shaped part 8 of the mirror-lamp 6 comprises a reflecting layer. The housing 1 is coupled to the base 2 by means of a hinge 9. Said hinge 9 is present at the edge of the bottom portion 10. The two current supply wires which are denoted by 11 and 12 extend through the hinge construction and are shown in broken lines.
The base 2 has a substantially flat shape and comprises a disc 13 which is rotatable about the central axis of the base. The disc 13 is secured in the base 2 by means of a bolt 14 and nut 15. The disc 13 comprises a recess 16 for passing through the current supply wires 11 and 12 as well as a few apertures 17 for mounting the luminaire to a wall or ceiling. The disc 13 furthermore comprises an upright edge 18 which forms an abutment for a cam 19 so that rotation of the disc 13 relative to the base 2 over an angle exceeding 360 is prevented.
The housing 1 consists of a cylindrical tub 20 and a member 21. The bottom 10 of said tub has a boss 22 in the centre on which the member 21 supports with its central portion 23. The member 21 furthermore comprises a cylindrical side wall 24 which joins the cylindrical wall of the tub 20. The side wall 24 comprises a number of vent holes 27. Vent holes 25 are also recessed in the annular zone 26 of the member 21 which is present between the central part 23 and the side wall 24. Vent holes 28 are recessed in the bottom 10 of tub 20. Due to said vent holes, the temperature of the housing 1 during operation remains low.
Continuous apertures are recessed in the boss 22 of the tub 20, in the central part 23 of the member 21 and in the lampholder 3, through which apertures the bolts 4 project. The apertures in the boss 22 open into the boss 10 and are denoted by 29 and 30 in FIG. 3. As shown in FIG. 3, sufficient space for the continuous apertures 29 and 30 is present due to the eccentric arrangement of the hinge 9 in the centre of the bottom 10. As a result of this it is possible to mount the lampholder 3, the member 21 and the tub 20 simply with two bolts and nuts.
A helically extending slot 31 is furthermore recessed in the cylindrical side wall 24 of the member 21. Said slot 31 cooperates with a projection 32 (see FIGS. 4 and occurring on a cylindrical socket 33. The socket 33 is axially movable relative to the housing 1 by rotation about its longitudinal axis. The slot 31 may be profiled so that the position of the socket 33 can be adjusted stepwise. The lower part 39 of the socket comprises a milled edge 34 extending coaxially with the socket and facilitating the rotation of the socket. The outer wall of the socket furthermore comprises six ridges 35. The height of said ridges decreases from the side having the milled edge 34 in the direction of the other side 40 of the socket. Due to said design of the ridges 35, a sleeve 36 (see FIG. 1) can be rigidly clamped on the socket 33. Such a sleeve is preferably used when the luminaire is used for a mirror lamp, for example, the compressed glass lamp denoted by 6 in FIG. 1. The chink 37 between the sleeve 36 and the rear wall 8 of the compressed glass lamp 6 can be closed by moving the sleeve 36.
A reflector 38 may also be clamped on the socket 33 as is shown in FIG. 2. The desired light beam pattern can be adjusted by the axial displacement of the socket 33 and hence of the reflector. I
In this embodiment a chink of a few millimetres is present between the bottom and the base 2. Of course it is also possible to construct the luminaire according to the invention in such manner that in a position of the housing relative to the base in which the respective longitudinal axes coincide. the bottom of the housing engages thc base. In this case, however. in order to obtain a good hinge effect, the rounding ofthe edges of the tub should be larger than is the case in the embodiment shown in FIGS. 1 and 2.
Of course, the base of the luminaire need not have a the shape shown in FIGS. 1 and 2. The base may naturally also be designed to cooperate for example, with a voltage rail.
in this embodiment the components of the luminaire are manufactured from polycarbonate.
What is claimed is:
1. A luminaire comprising:
a cylindrical tub having walls a longitudinal axis, and an end wall, said end wall having a vent opening therethrough;
a member secured interiorly of the tub, having a central portion on which a lampholder is mounted, said member comprising a cylindrical side wall having vent holes therein, said side wall being coaxial with the tub;
a base having a first portion for attachment to a structure and a second portion connected to said first portion for pivotal movement of less than approximately 360 about a base axis;
hinge means for pivotal connection of said tub to said second portion, said hinge having a pivotal hinge axis, said hinge means being so disposed between said end wall and said base that, at a first pivotal position, said tub axis and said base axis are coaxial, said hinge axis being ,-d i splaced radially from said tub and base axes; and
external socket means surrounding a portion of the side wall of said member and mounted thereon for axial movement along said member, for supporting and positioning focusing devices and protective shields on the luminaire.