JP4432805B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture in which a discharge lamp is sealed.

  Conventionally, a so-called explosion-proof lighting fixture in which a discharge lamp is sealed is provided and used for lighting in a place where a combustible gas may be filled (see, for example, Patent Document 1).

  As this type of lighting fixture, for example, there is one shown in FIGS. In this lighting fixture, a cylinder 1 that is formed in a cylindrical shape by a translucent material and surrounds a light emitting portion of a discharge tube L such as a straight tube type, for example, and a base L1 of the discharge lamp L are connected to each other. Two sockets 2 (only one is shown) and two holders 3 (only one is shown) each housing one socket 2 and covering the openings at both ends of the cylinder 1 are each formed in an annular shape. The holder 3 is held at a position closer to the axial center of the cylinder 1 than the socket 2 and guides the discharge lamp L when the discharge lamp L is connected to the socket 2 (only one). And a light-emitting block 10 having the structure shown in FIG. The gap between the holder 3 and the cylinder 1 is closed by a known means such as packing, O-ring or grease. Hereinafter, the upper, lower, left and right will be described with reference to FIG. That is, the axial direction of the cylinder 1 is referred to as the left-right direction.

  On the upper side of the light emitting block 10, a reflection plate 5 made of, for example, a metal plate and having at least a lower surface reflecting light is attached. The reflecting plate 5 is coupled to the light emitting block 10 by being screwed to each holder 3, for example. A ballast (not shown) is disposed above the reflector plate 5.

  The holder 3 has a cylindrical shape whose axial direction is the left-right direction, and a main body 31 where the cylinder 1 is coupled to one opening, and a lid 32 which is coupled to the main body 31 and closes the other opening of the main body 31. It consists of. The main body 31 and the lid 32 are coupled to each other, for example, by screwing a screw thread provided on the outer peripheral surface of the lid 32 into a screw groove provided on the inner peripheral surface of the main body 31. On the upper side of the main body 31, a through hole 31 a through which the electric wire C connected to the ballast is inserted is provided vertically. On the outer peripheral surface of the main body 31, a cylindrical protrusion 31 b that surrounds the entire circumference of the opening of the through hole 31 a is projected outward. The through hole 31a is closed by a cap 33 through which the electric wire C is inserted. The cap 33 is made of, for example, an elastic material and elastically contacts the inner peripheral surface of the cylindrical protrusion 31b over the entire periphery. The cap 33 is made of, for example, a metal plate and covers the upper opening of the cylindrical protrusion 31b together with the reflecting plate 5. The cover body 33b is screwed to the upper surface of the main body 31 of the holder 3.

  The socket 2 includes, for example, two terminal springs 21 (only one is shown) made of a conductive material having elasticity such as metal, and a socket housing 22 made of an insulating material and housing each terminal spring 21.

  Two socket housings 22 are provided side by side in the depth direction of the sheet of FIG. 9A, and each has a storage portion 22a that is open on the left and right sides away from the cylinder 1, and each terminal spring 21 is stored in the storage portion 22a. Has been. A pin insertion hole 22b through which a terminal pin L2 provided on the base L1 of the discharge lamp L is inserted is provided in the bottom surface of the storage portion 22a, that is, on the cylinder 1 side. The inner peripheral surface of the pin insertion hole 22b in the vicinity of the opening on the cylinder 1 side is inclined over the entire circumference so as to increase the inner diameter the closer to the opening.

  The terminal spring 21 is screwed to the bottom surface of the storage portion 22a, and a direction closer to the cylinder 1 in the left and right directions than the fixing portion 21a so as to be J-shaped together with the fixing portion 21a (left direction in the figure). ) Projecting to the pin insertion hole 22b and having a spring property to the left and right, and from the upper end of the fixing portion 21a in the left-right direction and away from the cylinder 1 (right direction in the figure) The protruding connecting portion 21c and the second contact that protrudes upward from the tip of the connecting portion 21c so as to be U-shaped together with the fixed portion 21a and that a part is exposed above the socket housing 22 and below the cap 33. Part 21d. A terminal pin 21 is electrically connected to the electric wire C when a contact pin (not shown) which is electrically coupled to the electric wire C and protrudes below the cap 33 is brought into contact with the second contact portion 21d. Further, the terminal pin L2 inserted from the pin insertion hole 22b is brought into contact with the first contact portion 21b, whereby the terminal pin L2 and the electric wire C are electrically connected via the terminal spring 21.

  At the end of the inner peripheral surface of the main body 31 of the holder 3 on the side to which the cylinder 1 is connected (left side in FIG. 9A), the inner diameter of the end of the main body 31 is larger than the outer diameter of the cylinder 1. In addition, a step 31 c is provided in which the inner diameter on the center side of the main body 31 is smaller than the outer diameter of the cylinder 1.

  The guide body 4 has an annular shape with the axial direction as a whole in the left-right direction, and is held by, for example, fitting to the inner peripheral surface of the holder 3 between the step 31 c of the holder 3 and the end surface of the cylinder 1. The flange 41 is sandwiched, and the guide portion 42 is provided inside the flange 41 and has an axial dimension larger than that of the flange 41 and the outer peripheral surface of which is fitted to the inner peripheral surface of the cylinder 1. That is, the guide part 42 protrudes inward from the inner peripheral surface of the cylinder 1 over the entire circumference of the cylinder 1. On the inner peripheral surface of the guide portion 42 near the opening on the center side of the cylinder 1 (left side in FIG. 9A), an inclined surface 42a is provided which increases the inner diameter of the guide portion 42 as it approaches the opening.

When attaching the discharge lamp L to the light emitting block 10, for example, the discharge lamp L is first inserted into the cylinder 1 connected to the right holder 3 with the left holder (not shown) removed. When the discharge lamp L reaches the guide body 4, the discharge lamp L is guided by the inclined surface 42a of the guide body 4, whereby the terminal pin L2 is guided to the opening of the pin insertion hole 22b, and then the pin insertion hole 22b. The terminal pin L2 of the right base L1 reaches the first contact portion 21b of the terminal spring 21 by guiding the terminal pin L2 to the inclined surface provided on the inner surface. Next, the base L1 on the left side of the discharge lamp L is connected to the left socket (not shown), and the cylinder 1 is connected to the left holder (not shown). Here, in the pin insertion hole 22b of each socket 2, the inner diameter of the end portion on the side away from the cylinder 1 is slightly larger than the outer diameter of the terminal pin L2. Therefore, in a state where each terminal pin L2 is in contact with the terminal spring 21, the terminal pin L2 is supported on the inner surface of the pin insertion hole 22b, so that the discharge lamp L has the central axis as the central axis of the cylinder 1. It is held at a position that is approximately matched. Here, the right socket 2 is coupled to the holder 3 via a coil spring 34 having a spring property on the left and right, and the discharge lamp L is sandwiched between the sockets 2 by the spring force of the coil spring 34.
Microfilm of Japanese Utility Model No. 61-182420 (Japanese Utility Model Application No. 63-85807)

  In the conventional lighting fixture, since the discharge lamp L contacts the guide body 41 only at one point when viewed from the axial direction (left-right direction in FIG. 9A), the discharge lamp L is released when the discharge lamp L is connected to the socket 2. There is a problem that the electric lamp L easily rotates in the circumferential direction and it is difficult to align the position of the terminal pin L2 and the position of the pin insertion hole 22b. The rotation is suppressed if the inner diameter of the guide portion 42 is close to the outer diameter of the discharge lamp L. In this case, if the outer diameter of the discharge lamp L is relatively large, for example, 32.5 mm, the guide portion 42 When the guide body 4 of FIG. 9 having a relatively large inner diameter is used and the outer diameter of the discharge lamp L is relatively small, for example, 25.5 mm, the guide body 4 of FIG. It is necessary to use different types of guide bodies 4 having different inner diameters depending on the outer diameter of the discharge lamp L.

  The present invention has been made in view of the above reasons, and an object thereof is to provide a lighting apparatus capable of suppressing the rotation of the discharge lamp when the discharge lamp is connected to the socket regardless of the outer diameter of the discharge lamp. There is to do.

According to the first aspect of the present invention, a cylinder that is formed in a cylindrical shape by a translucent material and surrounds a light emitting portion of a straight tube type discharge lamp, two sockets to which a base of the discharge lamp is connected, respectively, A cylindrical shape that houses two sockets and covers the openings at both ends of the cylinder, and is held at a position closer to the center of the cylinder in the axial direction than the socket, and the outer peripheral surface is fitted to the inner peripheral surface of the cylinder And a guide body having a plurality of guide protrusions that project inward from the inner peripheral surface of the guide part and that guide the discharge lamp when the terminal of the discharge lamp is connected to the socket. is being arranged symmetrically with respect to a plane passing through the central axis of the cylinder, on the inner peripheral surface of the guide portion, it has inclined surfaces is provided to increase the inner diameter toward the center side of the cylinder, each guide butt The, respectively, wherein the slope continuous to the inclined surface of the guide portion is provided.

  According to the present invention, when the discharge lamp is connected to the socket, it is possible to work in a state in which the discharge lamp is guided by at least two guide protrusions, so that the rotation of the discharge lamp is suppressed. Therefore, the operation of connecting the discharge lamp to the socket becomes easier than in the case where the guide protrusion is not provided. In addition, by connecting the discharge lamp to the socket in such a direction that the plane is a vertical plane, the attitude of the discharge lamp can be more stable than when the guide protrusions are arranged asymmetrically. Connection to the socket is easier.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the guide projections are arranged at equal intervals over the entire circumference of the cylinder.

  According to this invention, even if the direction of the guide body is deviated in the circumferential direction of the cylinder, an effect of suppressing the rotation of the discharge lamp can be expected.

  The invention of claim 3 is characterized in that, in the invention of claim 2, the guide body has six guide protrusions.

  In the present invention, a plurality of guide protrusions that project inward from the inner peripheral surface of the cylinder and guide the discharge lamp when the terminal of the discharge lamp is connected to the socket are arranged symmetrically with respect to a plane passing through the central axis of the cylinder. Therefore, when the discharge lamp is connected to the socket, it is possible to work in a state where the discharge lamp is guided by at least two guide protrusions, and thus the rotation of the discharge lamp is suppressed. In addition, by connecting the discharge lamp to the socket in such a direction that the plane is a vertical plane, the attitude of the discharge lamp can be more stable than when the guide protrusions are arranged asymmetrically. Connection to the socket is easier.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, as shown in FIGS. 2 and 3, the cylinder 1 is formed in a cylindrical shape by a light-transmitting material and surrounds the light emitting portion of the straight tube type discharge lamp L, and the cap L1 of the discharge lamp L, respectively. Are connected to each other, two holders 3 for accommodating one socket 2 and covering the openings at both ends of the cylinder 1, respectively. Two light-emitting blocks 10 each having two guide bodies 4 that are held at positions close to the center in the axial direction of the cylinder 1 and guide the discharge lamp L when the discharge lamp L is connected to the socket 2 are provided. In addition, a reflector 5 that is attached to the upper side of the light emitting block 10 and that has at least a lower surface reflecting the light of the discharge lamp L, and a fixture main body 6 that houses a ballast (not shown) and is attached to the upper side of the reflector 5 are provided. The instrument body 6 is attached to a construction surface such as a ceiling surface.

  The instrument body 6 includes a cylindrical cylinder portion 61 and two holder portions 62 that are coupled to and closed at both ends of the cylinder portion 61. Each holder 62 has an opening on both sides in the axial direction of the cylinder 61 and a body 62a to which the cylinder 61 is connected, and a lid 62b for closing the other opening of the body 62a. It consists of. The main body 62a of each holder 62 is coupled to the reflector 5 by, for example, screwing. Furthermore, a metal net 7 is attached to the reflecting plate 5 to surround the two light emitting blocks 10 together with the reflecting plate 5 in the circumferential direction of the cylinder 1 and protect the light emitting blocks 10. The ballast is housed in the cylinder portion 61 in a state where the ballast is housed in, for example, a case 63 shown in FIG.

  Hereafter, the characteristic part of this embodiment is demonstrated. As shown in FIGS. 1, 5, and 6, in this embodiment, the inner peripheral surface of the guide portion 42 of one guide body 4 (on the right side of FIG. 1A) protrudes inward from the other portions. Six guide protrusions 43 are provided with positions shifted by 60 degrees. That is, the guide protrusions 43 are provided at equal intervals over the entire circumference of the cylinder 1. Further, the guide protrusions 43 are symmetrical with respect to a vertical plane including the central axis of the cylinder 1 when the instrument body 6 is attached to the construction surface, and the even number of guide protrusions 43 are positioned below the central axis of the cylinder 1. Is arranged. Further, the end of the guide projection 43 on the cylinder 1 side is inclined so as to be continuous with the inclined surface 42a.

  When the discharge lamp L is attached to the light emitting block 10, for example, the cylinder 1 and the right holder 3 are coupled to each other with the left holder 3 in FIG. 1A removed from the cylinder 1. The discharge lamp L is inserted as shown in FIG. Then, the discharge lamp L is first guided by the inclined surface 42a as shown in FIG. 7B, and then guided by the guide protrusion 43 as shown in FIG. 7C, and the terminal pin L2 is inserted into the pin insertion hole 22b. Is connected to the socket 2. Next, the other cap L1 of the discharge lamp L is connected to the left socket 2, and the cylinder 1 is inserted into the left holder 3 for connection. Then, the discharge lamp L is sandwiched between the right socket 2 and the left socket 2 receiving the spring force of the coil spring 34, and each terminal pin L 2 is brought into contact with the terminal spring 21.

  Here, the protrusion dimension of the guide protrusion 43 is the discharge lamp guided by the guide protrusion 43 even when the outer diameter of the discharge lamp L is the largest within the assumed range as shown in FIGS. Even when the terminal pin L2 of L is small enough to be guided to the pin insertion hole 22b and the outer diameter of the discharge lamp L is the smallest within the assumed range as shown in FIGS. The lamp L is made large enough to be guided by the two guide protrusions 43 without contacting the inner peripheral surface of the guide body 4 except for the guide protrusions 43.

  Further, the guide protrusion 43 guides the opening diameter on the cylinder 1 side of the pin insertion hole 22b even when the outer diameter of the discharge lamp L is the smallest within the assumed range as shown in FIGS. The terminal pin L2 of the discharge lamp L is made large enough to be guided to the pin insertion hole 22b.

  According to the above configuration, when the discharge lamp L is connected to the socket 2, the discharge lamp L is guided by the two guide protrusions 43 regardless of the outer diameter of the discharge lamp L. That is, in the conventional example in which the guide protrusion 43 is not provided, the discharge lamp L contacts the guide body 41 only at one point when viewed from the axial direction (left-right direction in FIG. 9A), whereas in the present embodiment, the discharge lamp L is released. Since the electric lamp L comes into contact with the guide body 4 at two points when viewed from the axial direction (left and right directions in FIGS. 7A to 7D), the rotation of the discharge lamp L is suppressed. Therefore, the operation of connecting the discharge lamp L to the socket 2 is facilitated as compared with the case where the guide protrusion 43 is not provided.

  Moreover, since the guide protrusion 43 is disposed symmetrically with respect to the vertical plane including the central axis of the cylinder 1 when the instrument body 6 is attached to the construction surface, the guide protrusion 43 is disposed asymmetrically with respect to the vertical plane. Since the posture of the discharge lamp L is more stable than the case where the discharge lamp L is, the connection of the discharge lamp L to the socket 2 is easier.

  Furthermore, since the guide protrusions 43 are provided at equal intervals over the entire circumference of the cylinder 1, the effect of preventing the discharge lamp L from rotating can be expected even if the orientation of the guide body 4 in the circumferential direction is deviated.

It is a figure which shows the principal part of embodiment of this invention, (a) is front sectional drawing, (b) is side sectional drawing, (c) is the partially broken top view. It is a perspective view which shows the same as the above. It is a disassembled perspective view which shows the same as the above. It is a disassembled perspective view which shows the instrument main body same as the above, and its inside. It is sectional drawing which shows the principal part same as the above. It is a disassembled perspective view which shows the principal part same as the above. It is sectional drawing which shows the principal part same as the above, (a)-(d) shows the different step in the process of connecting a discharge lamp to a socket, respectively. It is sectional drawing which shows the principal part same as the above in case the outer diameter of a discharge lamp is smaller than the thing of FIG. 7, (a)-(d) shows the different step in the process of connecting a discharge lamp to a socket, respectively. It is a figure which shows the principal part of a prior art example, (a) is front sectional drawing, (b) is side sectional drawing. It is a figure which shows the principal part of another prior art example, (a) is front sectional drawing, (b) is side sectional drawing.

Explanation of symbols

1 Cylinder 2 Socket 3 Holder 4 Guide body 43 Guide protrusion L Discharge lamp

Claims (3)

A cylinder that is formed of a light-transmitting material and has a cylindrical shape and surrounds the light emitting portion of a straight tube type discharge lamp, two sockets to which the bases of the discharge lamps are connected, and one socket each are housed. Two holders covering the openings at both ends of the cylinder;
A cylindrical guide portion that is held at a position closer to the axial center of the cylinder than the socket and whose outer peripheral surface is fitted to the inner peripheral surface of the cylinder , and a discharge lamp that protrudes inward from the inner peripheral surface of the guide portion. And a guide body having a plurality of guide protrusions for guiding the discharge lamp when the terminal is connected to the socket,
The guide protrusions are arranged symmetrically with respect to a plane passing through the central axis of the cylinder ,
An inclined surface that increases the inner diameter toward the center of the cylinder is provided on the inner peripheral surface of the guide portion.
Each guide protrusion is provided with an inclination that is continuous with the inclined surface of the guide portion .   The lighting fixture according to claim 1, wherein the guide projections are arranged at equal intervals over the entire circumference of the cylinder.   The lighting apparatus according to claim 2, wherein the guide body has six guide protrusions.

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