JP4827603B2 - Socket for single base lamp - Google Patents

Description

  The present invention relates to a socket for a single base lamp, and more particularly to a socket designed to prevent a tracking phenomenon at a contact portion of a lamp base.

  A so-called single-base lamp is known as a lamp having a base having a plurality of base pins protruding from the bottom. As a typical example of this type of lamp, a single tube is bent at the center, the bent ends are close to each other, and the bent bases are fixed with a base formed of a heat-resistant insulating material. One having a pair of two conductive pins projecting from the bottom of the base can be mentioned.

  And as a socket for mounting this type of lamp, a wall that holds one side of the base including protrusions at both ends of the base is formed, and a pin insertion for inserting a pin for connecting the lamp to the bottom plate of the socket body A hole is provided, and on the other hand, a notch recess in which the protrusions at both ends of the base are to be accommodated is provided inside the both end surfaces of the wall body, and the shape along one side of the protrusion is formed in the notch recess, and Forming a wall body that holds one side of the base including protrusions at both ends of the base (Patent Document 1) provided with a locking tool whose tip is bent in a shape covering the top of the base, and this A pin insertion hole is provided on the bottom plate of the socket body to insert a pin for conducting the lamp. On the other hand, inside the both end surfaces of the wall body, there are provided locking portions to which the protrusions at both ends of the base should be locked (patent Document 2) is known. In these sockets, the outer edge of the base is in contact with the bottom plate of the socket, and the pin is inserted into the pin insertion hole and the protrusion is inserted into the engaging portion and locked by rotating it so that the lamp is raised using this as a fulcrum. The lamp was installed in the socket with pressure contact.

In addition, a conductive pin protrudes from the bottom surface, and a base housing portion into which a base of a single base lamp having locking projections provided on both side walls can be inserted is pivotally attached to the socket body. There is also known a socket of a type in which the mounting position where the bottom plate of the base housing part is superposed on the bottom plate of the socket body and the attachment / detachment position where the bottom plate of the base housing part is separated from the bottom plate of the socket body are rotated (Patent Document 3).
JP-A-9-161922 JP-A-1-161686 JP 2002-75565 A

  By the way, in recent years, when dust, moisture, etc. adhere to the periphery of the pin inserted into the socket and the insulation performance deteriorates locally, a current flows, causing a short-circuit and repeating the spark discharge, insulating the heat. The tracking phenomenon, in which the part is heated and a carbonization path (track) is formed on the surface to cause a fire, is a big problem.

  In the case of the socket for the single cap lamp described above, the conducting pins having different polarities of the lamp are arranged close to each other, so that a sufficient space distance between the pins cannot be secured and there is room for tracking.

  The present invention has been created to solve the above-described problems. The bottom surface of a single base lamp having a base in which a plurality of base pins protrude from the bottom surface is in contact with the surface, and the pin provided on the surface. A socket for a single base lamp in which a base receiving seat for inserting a conducting pin into the insertion hole is provided on the bottom plate surface of the socket body, and a valley portion is provided between the pin insertion holes of different polarity of the base receiving seat. And

  Since the pitch between the pins of the cap of the single cap lamp is determined by the standard, the spatial distance between the pins cannot be moved. However, in the present invention, since the valley portion is provided between the pin insertion holes of the opposite poles of the base receiving seat, the creepage distance that is the shortest distance along the surface of the base receiving seat that is an insulator is defined as the spatial distance between the pins. For example, the tracking resistance can be improved.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. Here, as a socket in which the present invention is implemented, a socket known in Patent Document 3 including a socket main body 1 and a base housing portion 20 that is pivotally attached to the socket main body is taken as an example.

  The base housing part 20 is a plastic container having an inner shape along the shape of the base in order to insert and hold the base S of the single base lamp L from the opening H, and a bottom plate for receiving the base The peripheral side wall 21 for holding the peripheral side of the base around the periphery of the base 23 stands up. The peripheral side wall 21 is provided with a pair of slits 22 for releasing the locking projections S1 on both side walls of the base S during insertion and exposing them (see FIG. 3). Further, the bottom plate 23 is provided with a window 24 through which a base receiving seat 10A, 10B of the bottom plate 2 of the socket main body 1 which will be described later is exposed at the mounting position.

  The socket body 1 is a plastic semi-container having an opening at the top and front for receiving the cap housing part 20 in a superposed state at the mounting position, and the bottom plate 23 of the cap housing part is placed on three sides of the base plate 2 that can be superposed. The back plate 5 and the side walls 3 are erected, and the back surface of the back plate 5 is a mounting surface to the lighting fixture W (see FIGS. 5 and 6). On both side walls 3, locking projections S 1 on both side walls of the base S of the lamp L exposed from the pair of slits 22 of the base housing portion 20 at the mounting position are locked to one side of these protrusions. A retaining recess 4 having a shape along the side is provided.

  2 and 7 are views showing the main part of the present invention. When the bottom plate 23 of the base accommodating portion 20 is superposed on the surface of the bottom plate 2, the bottom surface of the base S exposed from the window 24 is in contact with the surface and pin insertion holes 7A and 7B provided on the surface. The base receiving seats 10A and 10B through which the conductive pins P1 and P2 are inserted are raised. In the present invention, the above-described base receiving seat is raised at an independent interval for each of the pin insertion holes 7A and 7B having different polarities, thereby forming a valley portion T between the base receiving seats 10A and 10B. Thus, the creepage distance along the surface of the socket body is increased with respect to the spatial distance between the pins P1 and P2. Moreover, in this embodiment, the creepage distance is further increased by providing the notches 11A and 11B in which the walls recede in an arc shape near the center of the rising walls facing each of the base receiving seats 10A and 10B. Yes. In addition, the code | symbol 30 in the figure in FIG. 7 is a blade bracket-shaped contact metal fitting which these should contact at the time of insertion of the pins P1 and P2 by being arrange | positioned under the said pin insertion holes 7A and 7B.

  The above-described base housing portion 20 is pivotally attached to the socket body 1 with a pivotal attachment portion so as to be rotatable. For this reason, shafts 8 are provided at both ends of the open side of the socket body 1 facing the back plate 5 of the bottom plate 2, and the shaft 8 is attached to the projecting piece 25 suspended from both ends of the peripheral side wall of the cap housing part 20. A shaft hole 26 to be inserted is provided. The shape of the shaft and the shaft hole is not a perfect circle, but is configured so that a locking portion that locks each other during rotation is generated, and when it is forcibly rotated, it can get over the locking portion by mutual deformation. A shaft or a shaft hole or both of them are constituted by a material having a possible degree of elasticity.

  The socket of the present invention having the above-described configuration is attached to a lighting fixture W attached to a wall surface such as a ceiling, and is rotated so that the opening H thereof is inclined with respect to the socket body 1. Thus, the lamp L is set at the attachment / detachment position (see FIG. 5), and the base S of the lamp L is inserted into the base housing portion 20 through the opening H and rotated to the mounting position.

The perspective view of the socket for single cap lamps of this invention. The perspective view of the principal part same as the above. The perspective view of a nozzle | cap | die accommodating part same as the above. The perspective view of the attachment or detachment position of a lamp same as the above. FIG. Sectional drawing of the principal part same as the above.

Explanation of symbols

T valley portion 1 socket body 2 bottom plate (of socket body) 7A pin insertion hole 7B pin insertion hole 10A base receiving seat 10B base receiving seat 20 base housing portion 23 (base housing portion) bottom plate

Claims (1)

A base housing part into which the base of the single base lamp can be inserted is pivotally attached to the socket body so that the bottom plate of the base housing part is superposed on the bottom plate of the socket body and the base housing part from the bottom plate of the socket body In the socket that switches the attaching / detaching position where the bottom plate of the base plate is separated by rotation, when the bottom plate (23) of the base housing portion (20) is superposed on the bottom plate (2) of the socket body (1), the bottom surface of the base comes into contact with the surface. A base receiving seat (10A, 10B) through which a conducting pin is inserted into a pin insertion hole provided on the surface is provided so as to be raised independently for each pin insertion hole of a different polarity with respect to the bottom plate surface of the socket body. Is formed between the base receiving seats (10A, 10B) by forming a valley portion (T), and the base plate of the base receiving portion is provided with a window through which the base receiving seat is exposed. In this case, the creepage distance is further increased by providing a notch portion (11A, 11B) in which the wall is retracted in an arc shape in the vicinity of the center of the rising wall facing each of the base receiving seats (10A, 10B). A socket for a single base lamp characterized by the above.

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