JP2006066346A - Lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a movable contact point from deforming by external force without fear of electric shock by touching fingertips to a fixing contact point at changing of lamp, and with a stability of contact of the movable contact point and the fixing contact point. <P>SOLUTION: The lighting fixture is such that a straight tube fluorescent lamp is kept in a cylinder, a socket 7 electrically connecting the lamp to a socket holder arranged at both ends of the cylinder is slid and stored inside a socket holder 6, and the lamp can be changed from one openable and closable end of the socket holder. Electric connection of the socket 7 and the socket holder is made from a sliding contact of a fixing contact point provided on an inner surface of the socket holder with a movable contact point 9 with elasticity provided on a socket side, and also, the fixing contact point is on a bottom surface of a recess made of an insulation material, and the movable contact point 9 has a protrusion 17 contacting to the fixing contact point. Since the fixing contact point is protected by the insulation material of the recess, an unprepared contact (shock) to the fixing contact point can be prevented. Also, a contact part of the contact point is protected by the insulation material of the recess of the fixing contact point side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention mainly relates to a lighting fixture for a lamp socket such as an explosion-proof lighting fixture.

  Conventionally, in an explosion-proof lighting fixture that is used by housing a socket body and a lamp in a sealed cylinder, one end of the lamp holding unit is opened and closed, and the socket is taken out to take out the lamp held in the socket and replace the lamp. Do. Since the socket can be taken out, a contact is required to electrically connect the socket holder provided on the instrument body side and the socket. Therefore, a planar elastic movable contact is arranged on the socket side, and a convex fixed contact is provided on the socket holder side so as to contact the movable contact (for example, Patent Document 1).

  13A is a cross-sectional view of the socket holder of the conventional example 1, FIG. 13B is a perspective view of the butted socket of the conventional example, and FIG. 13C is a perspective view of the movable contact. As shown in FIG. 13B, the socket 50 includes a socket body 51 and a movable contact 52. The socket main body 51 is provided with a terminal insertion port 53. As shown in FIG. 13C, the movable contact 52 includes a thin upper portion and a lower portion that are elastically deformed, and is integrally formed with the attachment portion 54 and the contact plate 55. The mounting portion 54 is fixed to the socket body 51 by a screw 56 inserted through the hole 54a. As shown in FIG. 13A, the socket holder 57 includes a socket holder main body 58 and a fixed contact 59 for supplying power. The socket holder main body 58 has a cylindrical shape into which the socket main body 51 is inserted, and is formed with a concave guide 60 made of an insulating material. The fixed contact 59 protrudes inside the guide 60. A partition portion 61 that prevents the socket 50 from entering more than necessary is formed on the inner peripheral surface of the socket holder main body 58. Then, by inserting the socket 50 into the socket holder 58, the movable contact 52 and the fixed contact 59 are brought into contact with each other to realize electrical connection. Here, the groove width A of the guide 60 of the fixed contact 59 cannot be connected unless it is larger than the width B of the movable contact 52.

14 (a) and 14 (b) are cross-sectional views with different cut surfaces in the socket built-in state of Conventional Example 2. FIG. In this case, the socket is a plug-in type, and a terminal screw 62 is attached to the fixed contact 59. Other than that, the configuration is the same as that of Conventional Example 1. In the connected state, the movable contact 52 on the socket 50 side is in press contact with the fixed contact 59 on the socket holder 57 side. 63 is an end cap.
JP-A-11-53930

  However, as shown in FIG. 15, the fixed contact 59 on the socket holder 57 side has a convex shape, and the dimension C of the portion is smaller than the groove width A of the guide 60, so that the socket is removed when the lamp is replaced. Then, the fingertip touched easily and there was a fear of electric shock.

  In addition, a certain amount of clearance is required between the socket holder and the socket, but the contact of the contact becomes unstable because the socket tilts due to the clearance or the contact position of the contact changes due to lamp length variation, There was a risk of abnormal heat generation and defects.

Furthermore, since the width of the movable contact having a planar elasticity on the socket side is narrower than the width of the concave guide of the socket holder, the contact of the contact is unstable similarly to the above because it is likely to be deformed by an external force. There was a risk of abnormal heat generation and discoloration. Further, as shown in FIG. 16, since the movable contact 52 is exposed from the upper surface of the socket, there is a problem that it is easily deformed even when it is dropped or an external force is applied. The figure shows a plug-in socket,
The same applies to a butt socket.

  Therefore, an object of the present invention is to provide a lighting fixture that prevents the possibility of an electric shock by touching the fixed contact when the lamp is replaced, stabilizes the contact between the movable contact and the fixed contact, and prevents the movable contact from being deformed by an external force. It is to be.

  In order to solve the above-mentioned problems, a lighting apparatus according to claim 1 of the present invention is a socket for holding a straight tube fluorescent lamp in a cylinder and electrically connecting the lamp to socket holders disposed at both ends of the cylinder. Is a luminaire that can be slid and housed in the socket holder and the lamp can be exchanged from one end of the socket holder that can be opened and closed, and the electrical connection between the socket and the socket holder is connected to the inner surface of the socket holder. It consists of a sliding contact between a fixed contact provided and an elastic movable contact provided on the socket side, and the fixed contact is on the bottom surface of a recess made of an insulator, and the movable contact is fixed Has a convex part that contacts the contact.

  The lighting fixture according to claim 2 is the lighting fixture according to claim 1, wherein the concave portion of the socket holder has an inclination toward a bottom surface on which the fixed contact is disposed, and the width of the concave portion and the sinking depth of the fixed contact. The dimension relationship is such that even when a spherical surface with a radius of 2 mm is pressed against the recess, it does not hit the fixed contact.

  The lighting fixture according to claim 3 is the lighting fixture according to claim 1 or 2, wherein the movable contact is made of a spring material having conductivity, and the convex portion is longer in the socket sliding direction than the fixed contact by pressing. It is integrally formed.

  The lighting fixture according to claim 4 is the lighting fixture according to claim 1, 2, or 3, wherein the convex portion of the movable contact is formed of a continuous arc-shaped surface and is formed at a constant height in the socket sliding direction. It is a long shape, and in the contact state between the movable contact and the fixed contact, the convex portion of the movable contact is parallel to the socket sliding direction.

  The lighting fixture according to claim 5 is the lighting fixture according to claim 1, 2, 3 or 4, wherein the movable contact is within a space formed by connecting the tops of the socket outlines located on both sides thereof. .

  According to the lighting apparatus of the first aspect of the present invention, since the fixed contact is on the bottom surface of the concave portion made of an insulator, the fixed contact is protected by the insulator, so that the fixture is being assembled or the lamp is replaced. Inadvertent contact (impact) with the fixed contact inside can be prevented. For this reason, it is safe because the fingertip is difficult to touch the fixed contact. In addition, since the movable contact has a convex portion that comes into contact with the fixed contact, the contact portion of the contact is protected by an insulator in the concave portion on the fixed contact side. For this reason, the contact of the contact is stabilized.

  According to the second aspect of the present invention, the concave portion of the socket holder has an inclination toward the bottom surface on which the fixed contact is disposed. The position is corrected so as to come into contact. The width of the recess and the sinking depth of the fixed contact are dimensional relations that do not hit the fixed contact even if a spherical surface with a radius of 2 mm is pressed against the recess. The fingertip does not touch the fixed contact on the socket holder side, and even if you accidentally forget to turn off the power during lamp replacement or periodic inspection, there is no electric shock, ensuring safety.

  In claim 3, the movable contact is made of a spring material having conductivity, and the convex portion is formed by pressing, so the convex portion becomes a reinforcing rib, and the bending strength is increased as compared with the case without the convex portion, Elasticity is reduced, and even a spring material is similar to a rigid body. Further, since the convex portion is not easily deformed wherever the fixed contact comes into contact with the convex portion, the contact pressure is constant and the electrical connectivity is stable. Moreover, since the convex part of the movable contact is integrally formed longer in the socket sliding direction than the fixed contact, the entire length of the lamp and the length variation of the lamp pin are absorbed, and stable contact can be obtained.

  According to the fourth aspect of the present invention, since the convex portion of the movable contact is composed of a continuous arc-shaped surface, the contact is surely brought into contact with the positional deviation in the rotation direction of the socket. That is, even if the movable contact is inclined, the contact can be made as it is. In addition, since the convex part is a long shape formed at a certain height in the socket sliding direction, the contact pressure is constant regardless of where the fixed contact comes in the socket sliding direction of the movable contact. Sex is stable. In addition, when the movable contact is in contact with the fixed contact, the convex part of the movable contact is parallel to the socket sliding direction. Since the contact pressure is the same, the contact pressure is constant and the electrical connectivity is stable.

  In claim 5, since the movable contact is within the space formed by connecting the tops of the socket shells located on both sides of the movable contact, even when it is dropped during assembly of the instrument, during lamp replacement, during periodic inspection, etc. Directly movable contacts do not touch the floor and prevent deformation and breakage. Further, when packing the socket, the movable contact does not touch the partition plate, and deformation and breakage during transportation do not occur.

  An embodiment of the present invention will be described with reference to FIGS. 1A is a front view of a plug-in socket in a lighting fixture according to an embodiment of the present invention, FIG. 1B is a left side view, FIG. 1C is a right side sectional view, FIG. 1D is a plan view, and FIG. FIG. 2 is a partially broken rear view, FIG. 2 is a perspective view of the plug-in socket, FIG. 3A is a front view of the explosion-proof lighting fixture of the embodiment of the present invention, and FIG.

  As shown in FIG. 3, the appliance body 1 includes a cylinder 2 that holds a straight tube fluorescent lamp inside, a guard 3 that protects the cylinder 2, a reflector 4, a terminal plate 5, and socket holders that are disposed at both ends of the cylinder 2. 6 etc. are installed. The socket for electrically connecting the lamp to the socket holder 6 slides and is accommodated in the socket holder 6, and the lamp can be exchanged from one end of the socket holder 6 that can be opened and closed. In this case, a plug-in socket is disposed in the socket holder 6 on the lamp insertion side of the cylinder 2, and a butting socket is disposed in the socket holder 6 on the opposite side to the lamp insertion side.

  As shown in FIGS. 1 and 2, the plug-in socket 7 includes a socket body 8 made of a thermosetting resin such as melamine phenol and a pair of movable contacts 9. A terminal insertion port 10 is provided on the lamp contact surface of the socket body 8, and fitting portions 11 are provided on both side surfaces. The socket body 8 has a fixed portion 12 for the movable contact 9 and an opening 13 for exposing the movable contact 9 to the outside. The movable contact 9 is located in the opening 13 and is in the range of a space formed by connecting the tops of the socket bodies 8 on both sides thereof, and sinks below the upper surface of the socket (dashed line L). Further, a plate cover 15 is screwed to the back surface of the socket main body 8, and a knob portion 14 is projected from the plate cover 15.

  The movable contact 9 is made of a spring material having conductivity, and has a convex portion 17 that comes into contact with the fixed contact. In this case, it is composed of an upper part and a lower part that are elastically deformed, and is integrally formed with a mounting plate 18 and a contact plate 19 that sandwiches the lamp pin. The attachment portion 18 is fixed to the fixing portion 12 of the socket body 8 by a screw 20 inserted through the hole. At this time, the tip of the movable contact 9 is locked to the socket body 8. Moreover, the convex part 17 is integrally formed by press work in the bead shape. In this case, the convex portion 17 has an inverted U shape formed of a continuous arc-shaped surface (R surface), and is a long shape formed at a certain height in the socket sliding direction. Moreover, the convex part 17 is set so that it may become parallel to a socket sliding direction in a contact state with a fixed contact. Further, the interval between the convex portions 17 is substantially equal to the pitch of the terminal insertion ports 10.

  4A is a front view of a butt-type socket in the lighting fixture according to the embodiment of the present invention, FIG. 4B is a left side view, FIG. 4C is a right side sectional view, FIG. 4D is a plan view, and FIG. FIG. 5 is a rear view and FIG. 5 is a perspective view of the butted socket. Note that differences from the plug-in socket will be mainly described, and the same portions are denoted by the same reference numerals and description thereof will be omitted.

  As shown in FIGS. 4 and 5, the butt socket 22 includes a socket body 23 made of a thermosetting resin such as melamine phenol, and a pair of movable contacts 24.

  The socket body 23 is provided with a guide surface 10a of a lamp pin around the terminal insertion port 10, and does not have a plate cover and a knob portion. The movable contact 24 is composed of an upper portion having a convex portion 17 and a lower portion, and is integrally formed with a connecting portion 25 on which the mounting portion 18 and the lamp pin abut.

  6 (a) and 6 (b) are cross-sectional views in which the cut surface of the socket holder in the lighting apparatus of the embodiment of the present invention is different, FIG. 7 (a) is a front view of the fixed contact unit, (b) is a plan view, ) Is a side view.

  As shown in FIG. 6, the socket holder 6 includes a socket holder main body 27 and a fixed contact unit 28. The socket holder main body 27 has a cylindrical shape into which the socket main body 8 or 23 is inserted, and an opening 29 for attaching the fixed contact unit 28 is formed. Further, a protrusion 30 and a partitioning portion 31 on which the fitting portion 11 slides project from the inner peripheral surface of the socket holder main body 27. A thread groove 32 for screwing an end cap (not shown) is provided at one end, and a mounting portion 33 for the cylinder 2 is provided at the other end.

  As shown in FIG. 7, the fixed contact unit 28 is made of a thermosetting resin such as melamine phenol, and the fixed contact 35 is insert-molded on the bottom surface of the recess 34 made of an insulator. Further, guide slopes 36 are formed on both sides of the recess 34 in the socket sliding direction. Further, the convex portion 17 of the movable contact 9, 23 is longer in the socket sliding direction than the fixed contact 35, and the relationship between the size E of the fixed contact 35 and the length D of the convex portion 17 is D> E. ing. Further, as shown in FIG. 8, the fixed contact 35 is depressed so that the tip of the test finger 37 cannot be touched. The tip of the test finger 37 is a spherical surface with a radius of 2 mm, and the width of the concave portion 34 and the sinking depth F of the fixed contact 35 are set so that the spherical surface does not hit the fixed contact 35 even if the spherical surface is pressed against the concave portion 34. Further, the relationship between the sinking depth F and the height G of the convex portions 17 of the movable contacts 9 and 23 is G> F. As a result, the fingertip does not touch the fixed contact 35 on the socket holder 6 side, which is the secondary side output of the ballast and is a charging part, and an electric shock is received even if the power is accidentally forgotten at the time of lamp replacement or periodic inspection. There will be no safety.

  Next, the socket integration will be described. 9 (a) and 9 (b) are cross-sectional views with different cut surfaces in a socket built-in state in the lighting fixture of the embodiment of the present invention. Although the figure shows a plug-in socket, the same applies to a butt socket.

  As shown in FIG. 9, the socket 7 is inserted from one end of the socket holder 6 with the fitting portion 11 positioned by the protrusion 30. Then, the movable contact 9 is pressed by the guide slope 36 of the fixed contact unit 28 to be elastically deformed, the convex portion 17 is inserted into the concave portion 34, the fixed contact 35 and the movable contact 9 are in sliding contact, and the socket 7 and the socket The holder 6 is electrically connected. Since the convex portion 17 is formed in an arcuate surface, the contact point reliably contacts the positional deviation in the rotational direction of the socket 7. That is, even if the movable contact 9 is inclined, the contact can be made as it is. Further, since the convex portion 17 is a long shape formed at a certain height in the socket sliding direction, the contact pressure is constant no matter where the fixed contact 35 abuts the movable contact 9 in the socket sliding direction. The electrical connectivity is stable. Further, since the protrusion 17 is parallel to the socket sliding direction, the amount of deflection of the movable contact is the same regardless of where the fixed contact 35 abuts in the socket sliding direction of the movable contact. The electrical connectivity is stable.

  In the connected state, as shown in FIG. 10, the case where the concave portion 34 of the socket holder 6 has an inclination (taper) 38 toward the bottom surface on which the fixed contact 35 is disposed will be described. As shown in FIG. 10A, even if the position of the movable contact 9 is shifted as shown in the figure, it is guided to the fixed contact 35 side by the taper 38 inside the recess 34. This improves the reliability of contact as compared to the case where there is no taper. Further, as shown in FIG. 10B, since the reverse U-shaped taper 38 of the concave portion 34 and the convex portion 17 of the movable contact 9 are substantially parallel, the margin of displacement of the movable contact 9 in the left-right direction is Since there are more than the case without a taper, the reliability of a contact improves. Further, as shown in FIG. 10C, in addition to the same reason as described above, the tip of the movable contact 9 is rounded, so that the reliability of the contact is improved with respect to the downward direction compared to the case where there is no taper. To do.

  FIG. 11 and FIG. 12 are explanatory views of the packaged state of the socket in the lighting fixture according to the embodiment of the present invention. Although the figure shows a plug-in socket, the same applies to a butt socket.

  In FIG. 11, the sockets 7 are aligned in the packing box 40 in parallel in the vertical direction, and the sockets 7 in each row are partitioned by a partition plate 41. In the same manner as in FIG. 12, the sockets 7 are alternately arranged on the upper and lower sides. The movable contact 9 is within the space formed by connecting the tops of the socket outlines as described above. For this reason, when packing the socket 7, the movable contact 9 does not touch the partition plate 41, and deformation or breakage during transportation does not occur.

  As described above, according to the present embodiment, the fixed contact 35 is located on the bottom surface of the recessed portion 34 made of an insulating material. Inadvertent contact (impact) with the fixed contact inside can be prevented. For this reason, it is safe because the fingertip is difficult to touch the fixed contact 35. Moreover, since the movable contact 9 has the convex part 17 which contacts the fixed contact 35, the contact part of the contact is protected by the insulator of the concave part 34 on the fixed contact 35 side. For this reason, the contact of the contact is stabilized.

  Moreover, the convex part 17 becomes a reinforcement rib, and bending strength increases compared with the case where there is no convex part, elasticity becomes small, and even if it is a spring material, it is the same as that of a rigid body. In addition, the convex portion 17 is not easily deformed wherever the fixed contact 35 abuts the convex portion 17, so that the contact pressure is constant and the electrical connectivity is stable. That is, if the spring material has a flat plate shape without a convex portion, the surface state becomes non-uniform depending on the position of the fixed contact 35, and the contact pressure changes. Further, since the convex portion 17 is integrally formed longer in the socket sliding direction than the fixed contact 35, it absorbs variations in the total length of the lamp and the length of the lamp pin, and a stable contact can be obtained.

  The convex portion 17 may not be a continuous arc-shaped surface.

(A) is a front view of the plug-in type socket in the lighting fixture of the embodiment of the present invention, (b) is a left side view, (c) is a right side cross-sectional view, (d) is a plan view, and (e) is a part of it. FIG. It is a perspective view of the insertion type socket in the embodiment of the present invention. (A) is a front view of the explosion-proof lighting fixture of embodiment of this invention, (b) is a side view. (A) is a front view of a butt socket in the lighting fixture of the embodiment of the present invention, (b) is a left side view, (c) is a right side sectional view, (d) is a plan view, and (e) is a rear view. It is. It is a perspective view of the butting type socket in the embodiment of the present invention. (A) (b) is sectional drawing from which the cut surface of the socket holder in the lighting fixture of embodiment of this invention differs. (A) is a front view of a fixed contact unit, (b) is a top view, (c) is a side view. It is explanatory drawing of the fixed contact unit in embodiment of this invention. (A) (b) is sectional drawing from which the cut surface of the socket incorporating state in the lighting fixture of embodiment of this invention differs. It is explanatory drawing of the position shift state of the movable contact in embodiment of this invention. It is explanatory drawing of the packing state of the socket in the lighting fixture of embodiment of this invention. It is explanatory drawing of the packing state of the socket in the lighting fixture of embodiment of this invention. (A) is sectional drawing of the socket holder of the prior art example 1, (b) is a perspective view of the butted socket of a prior art example, (c) is a perspective view of the movable contact. (A) (b) is sectional drawing from which each cut surface in the socket incorporation state of the prior art example 2 differs. It is explanatory drawing which shows the problem of a prior art example. It is explanatory drawing which shows the problem of a prior art example.

Explanation of symbols

2 Cylinder 6 Socket holder 7 Plug-in socket 8 Socket body 9 Movable contact 17 Convex part 22 Butt type socket 23 Socket body 24 Movable contact 34 Concave part 35 Fixed contact

Claims (5)

  The straight tube fluorescent lamp is held in the cylinder, and the socket for electrically connecting the lamp to the socket holders arranged at both ends of the cylinder slides and is accommodated in the socket holder so that the socket holder can be opened and closed. The lamp can be exchanged from one end, and the electrical connection between the socket and the socket holder includes a fixed contact provided on the inner surface of the socket holder, and an elastic movable contact provided on the socket side. The lighting device is characterized in that the fixed contact is on the bottom surface of a concave portion made of an insulating material, and the movable contact has a convex portion that comes into contact with the fixed contact.   The concave portion of the socket holder has an inclination toward the bottom surface on which the fixed contact is disposed, and the width of the concave portion and the sinking depth of the fixed contact do not hit the fixed contact even when a spherical surface having a radius of 2 mm is pressed against the concave portion. The lighting apparatus according to claim 1, which has a dimensional relationship.   The lighting apparatus according to claim 1, wherein the movable contact is made of a spring material having conductivity, and the convex portion is integrally formed longer in the socket sliding direction than the fixed contact by pressing.   The convex part of the movable contact consists of a continuous arc-shaped surface and is a long shape formed at a certain height in the socket sliding direction. In the contact state of the movable contact and the fixed contact, the convex part of the movable contact is The lighting fixture according to claim 1, 2 or 3, which is parallel to the socket sliding direction.   The lighting fixture according to claim 1, 2, 3, or 4, wherein the movable contact is within a space formed by connecting tops of socket outlines located on both sides thereof.

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