JPH07272522A - Illuminator - Google Patents

Abstract

PURPOSE:To surely hold an illuminator and freely adjust the height of the device main body by screwing a suspension ceiling cap and a support body by a screw and elastically engaging the device main body and the support body. CONSTITUTION:A suspension ceiling cap 12 is connected to a suspension ceiling 5. A screw part 42 formed around the internal circumference of a support body 13 is threadly screwed to a screw part 35 formed around the circumference face of the suspension ceiling cap 12 in such a state as inserting the suspension ceiling cap 12 into an opening part 31 of a device win body 14. The support body 13 is rotated so as to adjust the height position of the device main body 14 to the ceiling face. A recessed/projecting part 33 of a fitting part 25 formed around the circumference of the opening part 31 of the device main body 14 and a latch part 15 provided in the support body 13 are elastically engaged with each other so as to prevent the support body 13 from rotating in the loosening direction. Fitting of the illuminator is thus facilitated, the device main body 14 is surely secured, its safety is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture installed directly on a ceiling surface using, for example, a hook ceiling.

[0002]

2. Description of the Related Art Conventionally, for example, various hook sealings shown in FIG. 6 have been used.

A hook ceiling 1 shown in FIG. 6 (a) is installed in a state where a part thereof is embedded in a ceiling surface, has a substantially cylindrical shape, and has a pair of arcuate connection holes 2 on its lower surface. Are formed. Then, inside each connection hole 2,
Connection fittings connected to the respective power lines are provided. Further, substantially L-shaped hooking claws 4 are provided on both sides of the hooking ceiling 1 so that a lighting fixture or the like having a weight of, for example, 5 kg or more can be engaged and held.
It should be noted that the hooking claw 4 has a claw portion 4a directed upward, respectively.
And the screw hole 4b is formed, and the screw 4c can be screwed into the screw hole 4b as required. Then, these claws 4a or screws
With 4c, the body of the lighting fixture is hooked and held.

Further, the hook ceiling 5 shown in FIG. 6 (b).
Is installed on the lower surface of the ceiling surface, and is formed in a cylindrical shape having a smaller diameter dimension and a larger protrusion dimension from the ceiling surface than the hook ceiling 1 shown in FIG.

Further, the hook ceiling 6 shown in FIG. 6 (c) has a substantially rectangular parallelepiped shape, and has substantially the same outer diameter dimension and the protrusion dimension from the ceiling surface as the hook ceiling 5 shown in FIG. 6 (b). There is.

Further, since the hooking claws 4 are not provided on the hooking ceilings 5 and 6 shown in FIGS. 6 (b) and 6 (c), when a heavy lighting fixture or the like is engaged and held, the hooking hooks 5 and 6 are hooked. Around the sealing members 5 and 6, an annular hooking metal having a hooking claw 4 is attached.

Then, as described above, the hook ceiling 1,
5 and 6 have various types of protrusions, and the condition of the ceiling surface differs depending on the situation of the installation location, so the lighting fixtures are directly attached to the ceiling surface using the hook ceilings 1, 5 and 6. When installing, it is necessary to adjust the height position of the fixture main body of the lighting fixture in various ways according to the respective hook ceilings 1, 5, 6 and the place of installation.

In this respect, for example, Japanese Patent Laid-Open No. 5-15
The luminaire described in 1812 is known.
This luminaire has a hook ceiling cap that is attached to the hook ceiling, and has an annular bearing that is screwed onto the outer peripheral surface of the hook ceiling cap and that abuts and supports the tool body. ing. And by rotating this support and moving it up and down,
The height of the device body can be adjusted by freely moving the device body up and down.

[0009]

However, in the above-mentioned conventional structure, since the instrument main body is supported by the support body screwed to the outer peripheral surface of the hook ceiling cap, the relationship between the hook seal cap and the support body is large. There is a problem in that the work of securely screwing together is required so that the fitting will not become loose, and the mounting work becomes complicated.

The present invention has been made in view of the above circumstances, and can easily and surely hold a lighting fixture, and
An object of the present invention is to provide a luminaire in which the height position of the luminaire main body of the luminaire can be freely adjusted in accordance with the protruding size of the hook ceiling.

[0011]

A lighting fixture according to claim 1 is a lighting fixture provided with a lamp and a lighting device which are installed on a fixture mounting surface by using a hook ceiling, wherein the hook ceiling is mechanical and A hook sealing cap that is electrically connected and has a threaded portion on its peripheral surface, and an opening through which the hook sealing cap can be inserted are formed, and an uneven portion is formed around the opening. An instrument body and an annular shape in which an inner peripheral surface is formed with a threaded portion that is screwed into a threaded portion of the hooking sealing cap, and has a support portion that abuts and supports the instrument body, and the uneven portion elastically And a bearing having an elastic convex portion that engages.

The luminaire according to claim 2 is a luminaire which is installed on a luminaire mounting surface by using a hook ceiling.
A hook sealing cap mechanically and electrically connected to the hook ceiling and having a threaded portion on its peripheral surface, and an opening through which the hook sealing cap can be inserted are formed, and the periphery of the opening is formed. An instrument body having an elastic convex portion, and an annular shape in which a threaded portion that is screwed into the threaded portion of the hooking sealing cap is formed on the inner peripheral surface, and with a support portion that abuts and supports the instrument body, And a bearing having an uneven portion that elastically engages with the elastic convex portion.

According to a third aspect of the present invention, there is provided the luminaire according to the first or second aspect, wherein engagement between the elastic convex portion and the concave and convex portion is of a support body screwed to the hook sealing cap.
The support portion allows rotation in a direction in which the device body is pressed toward the device mounting surface side and prevents rotation in the opposite direction, and allows the support body to rotate in the opposite direction. An engagement releasing means is provided.

A luminaire according to claim 4 is the luminaire according to any one of claims 1 to 3, wherein the luminaire main body is
A locking groove is formed around the opening so as to be engageable with the hooking portion that is located around the hooking ceiling and that is disposed on the instrument mounting surface.

[0015]

In the lighting device according to the first aspect of the present invention, the hook ceiling cap is mechanically and electrically connected to the hook ceiling, and the hook ceiling cap is inserted into the opening of the main body of the fixture. The threaded portion formed on the inner peripheral surface of the support is screwed into and screwed into the threaded portion formed on the surface. In this state, the support portion of the support body abuts the instrument body, and the instrument body is supported. Then, by rotating the support, the position of the instrument body with respect to the instrument attachment surface can be easily adjusted. In addition, since the uneven portion formed around the opening of the instrument body and the elastic protrusion provided on the support elastically engage with each other, unexpected rotation of the support is suppressed, and the support is prevented from rotating. Looseness is prevented.

According to another aspect of the lighting device of the present invention, the hook ceiling cap is mechanically and electrically connected to the hook ceiling, and the hook ceiling cap is inserted into the opening of the main body of the fixture. The threaded portion formed on the inner peripheral surface of the support is screwed into and screwed into the threaded portion formed on the surface. In this state, the support portion of the support body abuts the instrument body, and the instrument body is supported. Then, by rotating the support, the position of the instrument body with respect to the instrument attachment surface can be easily adjusted. In addition, since the uneven portion provided on the support body and the elastic protrusion formed around the opening of the instrument body elastically engage with each other, the rotation of the support body is prevented from rotating unexpectedly. Looseness is prevented.

According to the lighting device of the third aspect, in addition to the action of the first or second aspect, the support body screwed to the hook ceiling cap by the engagement of the elastic convex portion and the concave and convex portion,
The support portion allows rotation of the device body in the direction of pressing the device attachment surface side and prevents rotation in the opposite direction, so that unexpected rotation of the support body in the loosening direction is suppressed, and the support body is suppressed. Is prevented from loosening. Further, by operating the disengagement means, the bearing can be rotated in the opposite direction, and the bearing and the instrument body can be removed.

In addition to the operation according to any one of claims 1 to 3, the lighting fixture according to claim 4 is disposed on the fixture mounting surface around the opening of the fixture main body and around the hook ceiling. Since the engaging groove that can be engaged is formed in the hook portion, the instrument body is securely engaged and held by the instrument attachment surface.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the lighting equipment of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 4, reference numeral 11 denotes a ceiling-mounted type lighting fixture. This lighting fixture 11 uses a hook ceiling 5 installed on the ceiling surface A as a fixture mounting surface. It will be installed directly on the.

The lighting fixture 11 has a hook ceiling 5
It includes a hook sealing cap 12 mounted on the hook, a support 13 screwed to the hook sealing cap 12, an instrument body 14 supported by the support 13.

The instrument body 14 is a top plate having a substantially rectangular plane.
15 has a frame portion downward from the peripheral edge of the top plate 15.
16 are projected. Then, elongated plate-shaped socket bases 17 are attached to both ends of the lower surface of the top plate 15 along the inner side of the frame portion 16. Further, lamp sockets 18 are attached to the respective socket bases 17 at predetermined intervals along the longitudinal direction, and lamp sockets 18 facing each other are provided.
A straight tube type fluorescent lamp (not shown) is mounted between each of the eighteen.

Further, on the lower surface of the top plate 15 of the instrument body 14,
An elongated box-shaped lighting device 21 is mounted so as to connect the socket bases 17 at both ends. The lighting device 21 has a built-in inverter lighting circuit and the like, and is electrically connected to the socket bases 17 at both ends by a connector (not shown).

A control unit 22 is mounted on the lower surface of the top plate 15 of the instrument body 14 so as to be connected to one socket base 17. The control unit 22 has a built-in unit compatible with any one of the control methods such as a pull switch and a remote control switch. Further, at one end of the control unit 22, the socket base 17
The control unit 22 is provided with a connector (not shown) that is connected to the power supply line, and the other end of the control unit 22 is provided with a connector unit 23 to which a power supply line is connected.

A mounting portion 25 is integrally formed at the central portion of the top plate 15 of the instrument body 14. This mounting part 25
Is a truncated cone shape that is generally frusto-conical and faces inward and downward.
26 and a mounting plate portion 27 continuous to the lower end of the tapered surface portion 26.
And are formed. Further, a circular hole-shaped opening 31 is formed in the central portion of the mounting plate portion 27, and the periphery of the opening 31 is recessed upward at predetermined intervals in the circumferential direction. Recesses 32 are formed at multiple locations,
The uneven portion 33 is formed.

Further, the hook sealing cap 12 has a substantially cylindrical shape with both sides cut off in a flat shape, and a threaded portion 35 whose axial direction is the vertical direction is engraved on a circular arc-shaped peripheral surface. The outer diameter of the hook ceiling cap 12 is larger than the outer diameter of the round or square hook ceilings 5 and 6 attached to the lower surface of the ceiling surface A, and the opening in the center of the instrument body 14 is larger. It is formed smaller than the inner diameter of the portion 31. Then, on the upper surface of the hook sealing cap 12, a pair of charging metal fittings 36 having a substantially L-shaped cross section are provided.
The charging metal fittings 36 are inserted into the connection holes 2 of the hook ceiling 5 and rotated to be electrically and mechanically connected to the connection fittings inside the hook ceiling 5. . Also, from the hook ceiling cap 12, the power cord 37 connected to each charging fitting 36.
At the end of the power cord 37, a socket portion 38 that is detachably connected to the connector portion 23 of the control unit 22 attached to the instrument body 14 is provided.

The support 13 has an annular shape (ring shape) in which the insertion portion 41 is formed, and the inner peripheral surface facing the insertion portion 41 has a screw formed on the peripheral surface of the hook sealing cap 12. A screw portion 42 that is screwed into the portion 35 is formed. That is, the inner diameter of the insertion portion 41 of the support 13 is formed to be substantially the same as the outer diameter of the hook sealing cap 12. The outer diameter of the support 13 is formed to be substantially the same as the outer diameter of the mounting plate portion 27 of the instrument body 14.
The upper surface of 13 serves as a support portion 44 that abuts and supports the mounting plate portion 27 of the instrument body 14.

Further, the bearing 13 has a reverse rotation preventing mechanism.
46 is installed. The reverse rotation preventing mechanism 46 has a latch body 51 as an elastic convex portion that is vertically movably inserted into a rectangular hole portion 47 formed in the support portion 44 on the upper surface of the support body 13, and has an upper end portion. Can be engaged with the respective recesses 32 formed in the mounting plate portion 27 of the instrument body 14. A coil spring 52 as an elastic body is provided inside the support body 13 to constantly urge the latch body 51 upward. Further, a vertical locking surface 53 and an inclined surface 54 inclined downward from the upper end of the locking surface 53 are formed at the upper end of the latch body 51. The inclined surface 54 is provided on the front side in the rotation direction when the support 13 is screwed into the hooking sealing cap 12 from below and screwed in, and the locking surface 53 is provided on the support.
It is provided on the front side in the rotating direction when the hook 13 is removed from the hook sealing cap 12.

Further, a release lever 55 as an engagement releasing means is attached to the reverse rotation preventing mechanism 46. The release lever 55 is inserted in a rectangular hole 56 formed on the outer peripheral surface of the support 13 so as to be able to move back and forth. Further, the release lever 55 has a sliding contact surface 57 that is inclined downward toward the outside at the inner end, and an operation portion 58 that is pushed by a finger or the like at the outer end. Has been formed. The sliding contact surface 57 of the release lever 55 is always in contact with the latch body 51, and in the natural state,
The operating portion 58 of the release lever 55 is projected to the outside of the supporting body 13, and the sliding contact surface 57 is moved to the latch body 51 while the operating portion 58 of the release lever 55 is pushed toward the inside of the supporting body 13. Is designed to be pushed downward.

Next, the mounting operation of the luminaire 11 of this embodiment will be described.

First, as shown in FIG. 3, a hook ceiling cap 12 is attached to a hook ceiling 5 installed on a ceiling surface A.
Put on. Then, the instrument body 14 is pushed up, and the hook ceiling cap 12 and the power cord led out from the hook ceiling cap 12 are inserted into the opening 31 of the instrument body 14.
Insert the 37 and the socket portion 38 from the upper side.

Then, as shown in FIG. 4, the threaded portion 35 of the hook sealing cap 12 is attached to the threaded portion of the support 13 from below.
42 is screwed and screwed in. Then, the support portion 44 of the support body 13 abuts on the mounting plate portion 27 of the instrument body 14, and the instrument body 14 is supported via the support body 13, the hook sealing cap 12, and the hook ceiling 5, and the ceiling surface. Installed directly on A.

Further, by further screwing the support body 13 into the hook sealing cap 12, the instrument body 14 is pushed upward. In this way, the projection size of the hook ceiling 5 from the ceiling surface A, the shape of the ceiling surface A,
Alternatively, according to the shape of the back side of the instrument body 14,
The instrument body 14 is installed at the optimum height position.

In addition, the mounting plate portion 27 of the instrument body 14
When the support portion 44 of the support body 13 is in contact with the latch body 51 of the support body 13, the latch body 51 of the support body 13 is pushed downward against the biasing force of the coil spring 52. Then, in the process of screwing in the support body 13, the inclined surface 54 at the upper end of the latch body 51 becomes the front surface side in the rotation direction, so that the latch body 51 moves up and down in the recess 32 of the mounting plate portion 27. Overcome sequentially.

In this state, when the support body 13 is rotated in the opposite direction, that is, the support body 13 is removed, the latch body is rotated.
51 The locking surface 53 formed on the opposite side of the inclined surface 54 at the upper end is prevented from rotating and is prevented from loosening in a state of being engaged with any one of the concave portions 32 of the uneven portion 33 of the mounting plate portion 27. Has become.

Then, the socket portion 38 of the hook sealing cap 12 is connected to the connector portion of the control unit 22 of the instrument body 14.
By connecting to 23, the installation work of the lighting fixture 11 is completed.

On the other hand, when removing the instrument body 14 or lowering the position of the instrument body 14, the operating portion 58 of the release lever 55 protruding on the outer peripheral surface of the support 13 is pushed.
Then, the sliding contact surface 57 provided at the inner end of the release lever 55 slides on the latch body 51 and pushes the latch body 51 downward to engage the latch body 51 with the concave-convex portion 33. To release.
In this state, the support body 13 can freely rotate in the opposite direction, and the support body 13 can be removed and the instrument body 14 can be removed.

As described above, according to the lighting fixture 11 of this embodiment, the hook ceiling cap 12 is connected to the hook ceiling 5 and the hook ceiling cap 12 is inserted into the opening 31 of the main body 14 of the fixture. Hook ceiling cap 12
By screwing the screw portion formed on the inner peripheral surface of the support body 13 into the screw portion 35 formed on the peripheral surface of
14 can be easily installed on the ceiling surface A.

By appropriately rotating the support 13, the height position of the instrument main body 14 with respect to the ceiling surface A can be easily adjusted steplessly. Therefore, for example, regardless of the shape of the various hook ceilings 1, 5, 6 having different protrusion dimensions, the ceiling surface A, or the shape of the appliance body 14, the appliance body 14 is directly attached to the ceiling surface A and directly installed. be able to.

Further, the uneven portion 33 of the mounting portion 25 formed around the opening 31 of the instrument body 14 and the latch body provided on the support body 13
The support 51 is elastically engaged with the support 13 to prevent the support 13 from rotating in the loosening direction, so that the support 13 can be prevented from being loosened. Therefore, the mounting operation of the lighting fixture 11 can be facilitated, the rotation of the support 13 in the loosening direction can be prevented even when subjected to vibrations, etc., and the fixture main body 14 can be securely held to enhance safety. it can.

By pushing the operation portion 58 of the release lever 55, the engagement between the latch body 51 and the uneven portion 33 is released, and the instrument body 14 can be easily removed.

Further, since the outer diameter of the hook ceiling cap 12 is larger than the outer diameter of the round or square hook ceilings 5 and 6 attached to the lower surface of the ceiling surface A, the hook ceiling cap 12 has a larger outer diameter. The support 13 that is screwed onto the outer peripheral portion of the sealing cap 12 can be screwed in higher than the hook sealing cap 12 and near the ceiling surface A. Therefore, the range of movement of the support 13 can be increased, and the range of adjustment of the installation position of the instrument body 14 can be increased.

In the above embodiment, the mounting portion 25 of the instrument body 14 is provided with recesses on the mounting plate portion 27 which are upwardly spaced at predetermined intervals.
Although the concave and convex portions 33 are formed by forming the concave portions 32, the concave and convex portions 33 may be formed by continuously forming the concave and convex portions on the mounting plate portion 27 in the circumferential direction, or by inserting the concave portions 32 in the vertical direction. The same effect can be obtained as a through hole.

Further, in the above embodiment, the uneven portion 33 is formed on the instrument body 14 and the reverse rotation preventing mechanism is formed on the support 13.
The reverse rotation preventing mechanism 46 is provided with the latch body 51 as an elastic convex portion that elastically moves up and down.
The same effect can be obtained by forming the concavo-convex portion on 13.

Further, as shown in FIG. 5, a pair or a plurality of pairs of locking members are concentrically formed in the vicinity of the peripheral edge of the opening 31 of the mounting plate 27 of the mounting portion 25 provided on the instrument body 14. Groove 61
Can also be formed. Each locking groove 61 is composed of an arc-shaped groove portion 62 and an insertion hole 63 having a large width formed at one end of each groove portion 62.

When the embedded type hooking ceiling 1 having the hooking claws 4 integrally is used, or when the hooking ceilings 5 and 6 of other types are combined with separate hooking metal fittings, for example, In the state where the screw 4c as a hooking portion which is concentrically arranged by being screwed onto the claw 4 is inserted from the upper side of the insertion hole 63,
By rotating the instrument body 14 by a predetermined angle and engaging the engagement groove 61, the instrument body 14 can be engaged and held on the ceiling surface A. Furthermore, by tightening these screws 4c, the instrument body 14 can be firmly and reliably fixed.

In each of the above embodiments, the hook sealing cap 12 may be provided with a reverse rotation preventing mechanism having a latch body or the like.

[0048]

According to the lighting device of the first aspect, the hook ceiling cap is connected to the hook ceiling, and the hook ceiling cap is inserted into the opening of the main body of the fixture, and is attached to the peripheral surface of the hook ceiling cap. The instrument body can be easily installed on the instrument attachment surface by screwing the threaded portion formed on the inner peripheral surface of the support body into the formed threaded portion by screwing. Then, by rotating the support, the position of the instrument main body with respect to the instrument attachment surface can be easily adjusted. Further, the unevenness formed around the opening of the instrument main body and the elastic projection provided on the support elastically engage with each other, thereby suppressing an unexpected rotation of the support, and thus the support. Can be prevented from loosening. Therefore, the mounting work can be facilitated, and the instrument body can be securely held to enhance safety.

According to the lighting device of the second aspect, the hook ceiling cap is connected to the hook ceiling, and is formed on the peripheral surface of the hook ceiling cap in a state where the hook ceiling cap is inserted into the opening of the device body. The instrument body can be easily installed on the instrument mounting surface by screwing the screw section formed on the inner peripheral surface of the support body into the threaded section by screwing. Then, by rotating the support, the position of the instrument main body with respect to the instrument attachment surface can be easily adjusted. Also, with the uneven portion provided on the support,
By elastically engaging with the elastic protrusions formed around the opening of the instrument body, it is possible to suppress unexpected rotation of the support body and prevent the support body from loosening. Therefore, the mounting work can be facilitated, and the instrument body can be securely held to enhance safety.

According to the lighting device of the third aspect, in addition to the effect of the first or second aspect, the support body screwed to the hooking sealing cap by the engagement of the elastic convex portion and the concave and convex portion is a fixture. Rotation in the direction in which the main body is pressed against the device mounting surface side is allowed, and rotation in the opposite direction, which is the loosening direction, is blocked. Therefore, it is possible to prevent the support body from loosening by preventing an unexpected rotation of the support body in the loosening direction, so that the mounting work can be facilitated and the instrument body can be held securely.
The safety can be improved. Further, by operating the engagement releasing means, the support body can be rotated in the opposite direction, and the support body and the instrument body can be removed.

According to the lighting device of the fourth aspect, in addition to the effect of any one of the first to third aspects, in addition to the effect of any one of the first to third aspects, the lighting fixture is located around the opening of the fixture body and is located around the hook ceiling on the fixture mounting surface. Since the engaging groove that is engageable with the hook portion provided is formed, the instrument body can be more securely engaged and held by the instrument attachment surface.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a lighting fixture of the present invention.

FIG. 2 is a perspective view of a part of the lighting fixture in an exploded state.

FIG. 3 is an explanatory view showing an attaching operation in which a part of the above lighting equipment is cut out.

FIG. 4 is an explanatory view showing an attaching operation in which a part of the lighting fixture is cut out.

FIG. 5 is a partially exploded perspective view showing another embodiment of the lighting fixture of the present invention.

FIG. 6 is a perspective view showing a hook ceiling. (A) is an embedded hook ceiling (b) is a round hook ceiling (c) is a square hook ceiling

[Explanation of symbols]

 1, 5, 6 Hooking ceiling 4c Screw as hooking part 11 Lighting fixture 12 Hooking ceiling cap 13 Bearing 14 Fixture body 21 Lighting device 31 Opening 33 Uneven part 35 Threaded part 42 Threaded part 44 Support part 51 As elastic convex part Latch body 55 Release lever as engagement release means 61 Locking groove A Ceiling surface as equipment mounting surface

Claims (4)

[Claims] 1. A lighting fixture including a lamp and a lighting device, which are installed on a fixture mounting surface by using a hook ceiling, wherein the lighting fixture is mechanically and electrically connected to the hook ceiling and has a threaded portion on a peripheral surface. The formed hook sealing cap, an opening through which the hook sealing cap can be inserted are formed, and an unevenness portion is formed around the opening, and an inner peripheral surface of the hook sealing cap. And a bearing having an elastic convex portion that elastically engages with the concave-convex portion while having an annular shape in which a screw portion that is screwed into the screw portion is formed and that has a supporting portion that abuts and supports the instrument body. A luminaire characterized by being provided. 2. A lighting fixture installed on a fixture mounting surface using a hook ceiling, the hook ceiling cap being mechanically and electrically connected to the hook ceiling and having a threaded portion formed on a peripheral surface thereof. An instrument main body having an opening through which the hook sealing cap can be inserted and having an elastic convex portion around the opening, and a screw threaded to the thread portion of the hook sealing cap on the inner peripheral surface thereof. And a support body having a support portion that abuts and supports the instrument main body, and a support body that has a concavo-convex portion that elastically engages with the elastic convex portion. lighting equipment. 3. The engagement between the elastic convex portion and the concave-convex portion allows the support body screwed to the hooking sealing cap to rotate in a direction in which the support body presses the device body toward the device mounting surface. 3. Illumination according to claim 1 or 2, characterized in that the bearing is provided with disengagement means for blocking rotation in opposite directions and allowing rotation of the bearing in opposite directions. Equipment. 4. The instrument main body is characterized in that a locking groove is formed around the opening so as to be engageable with a hooking portion which is located around the hooking ceiling and is arranged on the instrument mounting surface. The lighting fixture according to any one of claims 1 to 3.