JP2005044717A - Lamp socket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the fall of a lamp even in a state that the lamp is held by only a conductive terminal. <P>SOLUTION: In the lamp socket formed with two lamp-pin insertion openings 11 directed toward the center from the periphery of a socket body 1, in which lamp pins are inserted along the lamp-pin insertion openings 11 and held in a state of being in contact with conductive terminals at each end of the openings 11, the lamp pins are enabled to be held by provisional lamp-pin holding parts 16 set in the vicinity of entrances of the lamp-pin insertion openings 11, and the provisional lamp-pin holding parts 16 are enabled to have parts in contact with inside parts of the opposing lamp pins elastically deform toward the center axis side of the lamp. By this, even if the lamp slips off from the conductive terminals in the socket, the lamp pins are held by the provisional lamp-pin holding parts 16, so that the lamp is prevented from falling off and safety is improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lamp socket applied to, for example, a lighting fixture for a straight tube fluorescent lamp.

As a conventional lamp socket, in order to allow a lamp pin to be inserted into the pin hole from the circumferential side of the socket body and to be connected to the conductive terminal, the pin hole is provided in a long hole shape with one end opened toward the socket body circumferential side. (For example, see Patent Documents 1 and 2). In addition, in order to ensure the waterproofness of the lamp socket, a cover cylinder (waterproof ring) containing a packing is screwed into a screw cylinder of the socket body.
JP 2000-31558 A JP 2000-31557 A

  The lamp socket of the conventional example is used as a waterproof socket having a waterproof ring as described above. Under normal conditions of use, the lamp is supported by a waterproof ring, but the lamp is removed during lamp replacement work, and the lamp is only held by a conductive terminal for lighting inspection. There are many. At this time, since there is a risk of the lamp falling due to vibration, impact, etc., the performance that the lamp does not fall is required from the viewpoint of safety and workability even without the waterproof ring.

  Accordingly, an object of the present invention is to provide a lamp socket capable of preventing the lamp from falling even when the lamp is held only by the conductive terminal.

  In order to solve the above-mentioned problem, the lamp socket according to claim 1 of the present invention has two lamp pin insertion openings from the periphery of the socket body toward the center, and the lamp pins are inserted along the lamp pin insertion opening. In the lamp socket that is held in contact with the conductive terminal at each end of the lamp pin insertion opening, a lamp pin temporary holding portion is provided in the vicinity of the entrance of the lamp pin insertion opening so that the lamp pin can be held. In addition, the lamp pin temporary holding portion can be elastically deformed toward the center axis side of the lamp at a portion contacting the inside of the opposite lamp pin.

  The lamp socket according to claim 2 is the lamp socket according to claim 1, wherein a slit is provided between the two lamp pin insertion openings where the lamp pin temporary holding portion is located.

  The lamp socket according to claim 3 is the lamp socket according to claim 2, wherein the lamp pin temporary holding portion includes a pair of convex portions formed so as to face the inner side and the outer side of the lamp pin insertion opening portion. On the projection plane in the direction, the midpoint of the pair of convex portions is outside the center line of the lamp insertion opening.

  The lamp socket according to claim 4 is the lamp socket according to claim 2, wherein the lamp pin temporary holding portion includes a pair of convex portions formed so as to face the inside and the outside of the lamp pin insertion opening, The convex part is longer than the inner convex part in the center direction of the socket body.

  According to a fifth aspect of the present invention, in the lamp socket according to the second aspect, an over-deformation preventing projection on the inner wall is disposed between the inner walls of the two lamp pin insertion openings divided by the slit.

  According to the lamp socket of the first aspect of the present invention, the lamp pin temporary holding portion is provided in the vicinity of the entrance of the lamp pin insertion opening so as to be able to hold the lamp pin, and the lamp pin temporary holding portion is in contact with the inside of the facing lamp pin. Since the part can be elastically deformed toward the center axis of the lamp, even if the lamp is detached from the conductive terminal inside the socket, the lamp pin is held by the temporary holding pin of the lamp, so there is no risk of the lamp falling and safety is improved. To do. In addition, since the lamp pin temporary holding portion is elastically deformed, deterioration of the lamp pin temporary holding portion due to repeated attachment and detachment of the lamp is reduced. Further, since the lamp pin temporary holding portion is elastically deformed inward, the socket does not become large.

  According to the second aspect of the present invention, since the slit is provided between the two lamp pin insertion openings where the lamp pin temporary holding portion is located, the portion of the lamp pin temporary holding portion that contacts the inside of the facing lamp pin is elastic toward the center axis side of the lamp. A deformable configuration can be easily realized without increasing the cost.

  According to a third aspect of the present invention, the lamp pin temporary holding portion includes a pair of convex portions formed so as to face the inner side and the outer side of the lamp pin insertion opening, and an intermediate point between the pair of convex portions on the projection surface in the lamp axis direction is Because it is outside the center line of the lamp insertion opening, the convex part on the inner side of the lamp pin temporary holding part tends to bend due to the positional relationship between the lamp pin insertion opening and the temporary holding part of the lamp pin, compared with the case where the outer convex part is bent. The socket becomes smaller.

  According to a fourth aspect of the present invention, the lamp pin temporary holding portion is composed of a pair of convex portions formed so as to face the inner side and the outer side of the lamp pin insertion opening portion, and the outer convex portion is moved from the inner convex portion toward the center of the socket body. Since it is made longer, the convex part inside the lamp pin temporary holding part functions only when the lamp is inserted. In the lamp temporary holding state, a load of the lamp is applied to the outer convex portion. Therefore, it is safe because a load is not left on the inner convex portion that is movable by elastic deformation.

  According to the fifth aspect of the present invention, since the over-deformation preventing protrusion of the inner wall is disposed between the inner walls of the two lamp pin insertion openings divided by the slit, the lamp pin temporary holding portion is damaged by an excessive force from the outside. Can be prevented.

  A first embodiment of the present invention will be described with reference to FIGS. 1 is an exploded perspective view of a main part of a lamp socket according to a first embodiment of the present invention, FIG. 2 is a front view of the assembled lamp socket, and FIG. 3 is an overall perspective view of the lamp socket according to the first embodiment of the present invention. FIG. 4 is an exploded perspective view thereof.

  1-4, 1 is a socket body, 2 is a cover of the socket body, 3 is a conductive terminal, 4 is a waterproof ring packing, 5 is a metal ring, 6 is a resin ring (waterproof ring), and 7 is a lead wire packing. It is.

  As shown in FIGS. 1 and 2, the socket main body 1 has a screw cylinder portion 10 provided with a screw around it, and a cover 2 that covers the conductive terminal 3 is mounted therein. Further, the lamp body has two lamp pin insertion openings 11 from the periphery of the socket body 1 toward the center. Each lamp pin insertion opening portion 11 is formed in the cover 2 so that the conductive terminal 3 faces, and has an opening portion 11a formed so as to cut out the position of the screw tube portion 10 in the extending direction. The lamp pin is inserted along the lamp pin insertion opening 11 as indicated by an arrow, and is held in contact with the conductive terminal 3 at each end of the lamp pin insertion opening 11. The socket body 1 and the cover 2 are made of a thermoplastic resin or the like. The socket body 1 is formed with a mounting groove 14 and a drain hole (not shown). The cover 2 is fixed to the socket body 1 by cold caulking 13.

  In the configuration of the socket body 1, a lamp pin temporary holding portion 16 capable of holding the lamp pin is provided in the vicinity of the entrance of the lamp pin insertion opening 11. The lamp pin temporary holding portion 16 has a configuration in which a portion contacting the inside of the facing lamp pin 20 can be elastically deformed toward the center axis side of the lamp. In this case, the lamp pin temporary holding portion 16 includes a pair of convex portions 16 a and 16 b formed so as to face the inside and the outside of the lamp pin insertion opening 11. The distance L between the pair of convex portions 16a and 16b is narrower than the lamp pin diameter. Further, by providing the slit 17 between the two lamp pin insertion openings 11 where the lamp pin temporary holding portion 16 is located, the inner convex portion 16a is elastically deformed toward the center axis side of the lamp.

  FIG. 5 shows the lamp pin temporary holding state. As shown in FIG. 5, the lamp pin 20 inserted along the lamp pin insertion opening portion 11 from the opening portion 11 a is held by the lamp pin temporary holding portion 16. At this time, when the lamp pin temporary holding portion 16 comes into contact with the lamp pin 20, the inner walls 18 of the two lamp pin insertion openings 11 separated by the slit 17 are elastically deformed. Further, in order to prevent the inner wall 18 from being excessively deformed by an excessive force from the outside, the over-deformation preventing protrusion 22 is disposed. This over-deformation preventing protrusion 22 protrudes from the socket body 1 and is fitted into a recess 23 formed on the opposing surface of the slit 17.

  FIG. 6A shows a lamp pin connection state, and FIG. 6B shows a lamp pin temporary holding state. In the figure, the lamp length is reduced and displayed. As shown in FIG. 6, since the lamp 21 is temporarily held at a position as far as possible from the connection position by the conductive plate 3, it is visually easy to understand that the lamp 21 is not in the normal connection position.

  As shown in FIGS. 3 and 4, the waterproof ring packing 4 is inserted between the screw tube portion 10 and the cover 2. The resin ring 6 is screwed into the threaded cylinder portion 10 of the socket body 1 and has an edge portion so that the metal ring 5 contacts. In the assembled state shown in FIG. 3, after the lamp pin is connected, one end side of the waterproof ring packing 4 is inserted between the screw tube portion 10 of the socket body and the cover 2, and the metal ring 5 is disposed on the other end side. The resin ring 6 is put on and screwed into the screw cylinder portion 10 and tightened. Thereby, the waterproof ring packing 4 is compressed and waterproof performance is ensured. The metal ring 5 is disposed between the resin ring 6 and the waterproof ring packing 4 to reduce friction when the resin ring 6 rotates.

  According to the present embodiment, even when the lamp is detached from the conductive terminal 3 inside the socket, the lamp pin is held by the lamp pin temporary holding portion 16 so that there is no fear of the lamp falling and the safety is improved. In particular, during the lamp replacement operation, the resin ring 6 is removed, and the lamp is held only by the conductive terminal 3 and is often left in this state for lighting inspection and the like. At this time, even if the lamp is detached from the conductive terminal 3 due to vibration or impact, the fall can be prevented.

  In addition, since the lamp pin temporary holding portion 16 is elastically deformed by the slit 17, the deterioration of the lamp pin temporary holding portion 16 due to repeated attachment and detachment of the lamp is reduced. Moreover, since the lamp pin temporary holding portion 16 is elastically deformed inward, the socket does not become large.

  Note that the lamp pin temporary holding portion 16 may not have a slit as long as the portion that contacts the inside of the opposite lamp pin can be elastically deformed toward the center axis of the lamp. For example, as shown in FIG. 7, a concave portion 25 is provided on the side surface of the lamp pin insertion opening 11 on the center axis side of the lamp, and the convex portion 16 a inside the lamp pin temporary holding portion 16 is formed integrally with the concave portion 25. Good. In this case, the lamp pin temporary holding portion 16 has a spring property so that the inner convex portion 16 a is pushed into the concave portion 25 by contact with the lamp pin 20.

  FIG. 8 shows a comparative example in which the tip of the lamp pin 20 is temporarily held. In this case, the lamp pin temporary holding portion 26 protrudes from the inner bottom surface of the socket body 1. Reference numeral 27 denotes a holding height of the lamp 21. As compared with the present embodiment in which the lamp pin temporary holding portion 26 is provided in the lamp pin radial direction, the temporary holding performance is lowered.

  A second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a front view of an essential part of a lamp socket according to a second embodiment of the present invention.

  As shown in FIG. 9, the lamp pin temporary holding portion 16 includes a pair of convex portions 16a and 16b formed so as to face the inner side and the outer side of the lamp pin insertion opening as in the first embodiment. The midpoint between the pair of convex portions 16 a and 16 b is outside the center line of the lamp insertion opening 11 on the axial projection surface. That is, the relationship between the distance a from the center line of the lamp insertion opening 11 to the inner convex portion 16a and the distance b to the outer convex portion 16b is a <b.

  According to the present embodiment, due to the positional relationship between the lamp pin insertion opening 11 and the lamp pin temporary holding portion 16, the inner convex portion 16a is more easily bent. Therefore, the socket is small because it is difficult to spread outward. Other structural effects are the same as those of the first embodiment.

  A third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a front view of an essential part of a lamp socket according to a third embodiment of the present invention, and FIG. 11 is an explanatory view of a lamp pin temporary holding state according to a third embodiment of the present invention.

  As shown in FIG. 10, the lamp pin temporary holding portion 16 includes a pair of convex portions 16 a and 16 b formed so as to face the inner side and the outer side of the lamp pin insertion opening 11 as in the first embodiment. The outer protrusion 16b is made longer in the center direction of the socket body 1 than the inner protrusion 16a. That is, the relationship between the length c of the inner convex portion 16a and the length d of the outer convex portion 16b is c <d.

  According to this embodiment, the convex part 16a inside the lamp pin temporary holding part 16 functions only when the lamp is inserted. In the lamp temporary holding state, as shown in FIG. 11, the lamp pin 20 contacts the outer convex portion 16b, and a load of the lamp is applied to the convex portion 16b. Therefore, a load is not continuously applied to the inner convex portion 16a that is movable by elastic deformation. The maximum lamp pin holding force is the same as when c = d. Other structural effects are the same as those of the first embodiment.

It is a principal part disassembled perspective view of the lamp socket of 1st Embodiment of this invention. It is a front view of the assembled state of FIG. 1 is an overall perspective view of a lamp socket according to a first embodiment of the present invention. FIG. 4 is an exploded perspective view of FIG. 3. It is explanatory drawing which shows a lamp pin temporary holding state. (A) is explanatory drawing which shows a lamp pin connection state, (b) is explanatory drawing which shows a lamp pin temporary holding state. It is a principal part enlarged view which shows the modification of the lamp socket of 1st Embodiment of this invention. It is explanatory drawing of a comparative example. It is a principal part front view of the lamp socket of 2nd Embodiment of this invention. It is a principal part front view of the lamp socket of 3rd Embodiment of this invention. It is explanatory drawing of the lamp pin temporary holding state of 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Socket main body 2 Cover 3 Conductive terminal 11 Lamp pin insertion opening 16 Lamp pin temporary holding part 17 Slit 18 Inner wall 22 Overdeformation prevention protrusion part

Claims (5)

  The lamp body has two lamp pin insertion openings extending from the periphery of the socket body toward the center, and the lamp pins are inserted along the lamp pin insertion openings and contact the conductive terminals at the respective ends of the lamp pin insertion openings. In the lamp socket held in a state, a lamp pin temporary holding portion is provided near the entrance of the lamp pin insertion opening so that the lamp pin can be held, and the lamp pin temporary holding portion has a portion in contact with the inside of the opposite lamp pin. A lamp socket characterized in that it is elastically deformable on the center axis side of the lamp.   The lamp socket according to claim 1, wherein a slit is provided between two lamp pin insertion openings where the lamp pin temporary holding portion is located.   The lamp pin temporary holding portion includes a pair of convex portions formed so as to face the inside and the outside of the lamp pin insertion opening portion, and an intermediate point between the pair of convex portions on the projection surface in the lamp axis direction is a lamp insertion opening. The lamp socket according to claim 2, wherein the lamp socket is located outside a center line of the portion.   The lamp pin temporary holding portion is composed of a pair of convex portions formed so as to face the inner side and the outer side of the lamp pin insertion opening, and the outer convex portion is longer in the center direction of the socket body than the inner convex portion. 2. The lamp socket according to 2.   The lamp socket according to claim 2, wherein an over-deformation preventing projection on the inner wall is disposed between the inner walls of the two lamp pin insertion openings divided by the slit.

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