JP2007024212A - Conductive fastener - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate interception of electrical connection caused by vibration or the like and to prevent loss of spring washer or a conductive claw washer fastened by a thumb screw, in removing the thumb screw. <P>SOLUTION: This conductive fastener fastens and fixes a conductive member 11 and a member 12 with an insulating paint film applied to the whole surface region, by the thumb screw 14 through the spring washer 16 and the conductive claw washer 15. The spring washer 16 and the conductive claw washer 15 are fitted and held in a shank 14a between a knob 14b and a thread ridge 14c of the thumb screw 14. Claws 15a of the conductive claw washer 15 thereby break through the insulating paint film and bite into the member 12 only by fastening the thumb screw 14, to ensure conductive connection between the member 11 and member 12. At the same time, the member 11 and the member 12 are mechanically fixed to prevent interception of conductive connection to thereby prevent the fall of the spring washer and conductive claw washer from the thumb screw 14 even if the thumb screw is removed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a conductive fixture for conductively fixing between members.

  For example, a lighting fixture in which a plurality of straight tubular fluorescent discharge lamps are mounted in parallel and laid on an indoor ceiling or wall surface is generally known. FIG. 2 shows an example of the structure of such a lighting fixture. In FIG. 2, reference numeral 1 is a lighting fixture body made of metal such as iron for storing lighting circuit components, etc., and 2 is an insulating coating (outer surface) over the entire surface. Is a reflector made of metal such as iron with a white coating), 3 is a socket for holding and energizing the fluorescent discharge lamp, and 4 is a mounting screw for fixing the reflector 2 to the luminaire body 1.

  The luminaire is attached to the luminaire main body 1 with sockets 3 fixed to both ends of the luminaire main body 1 and applied to the reflector 2, and the reflector is attached to the luminaire main body 1 with the mounting screws 4. Fastened to complete. Since the luminaire main body 1 is grounded when the luminaire constructed in this way is laid on an indoor ceiling or wall surface, there is no fear of electric shock even if the luminaire main body 1 is touched. However, since the reflecting plate 2 has an insulating coating applied to the entire surface, the grounding of the reflecting plate 2 is performed by contacting the inner peripheral surface of the screw insertion hole 2 a of the reflecting plate 2 with the mounting screw 4 and the mounting screw 4. This is due to the screw-in hole 1a of the luminaire main body 1, and its grounding is not sufficient. For example, when an electric wire in the luminaire main body 1 hangs down on the reflector 2, the potential of the reflector 2 is increased and reflected. Touching the plate 2 may cause an electric shock.

  In order to reduce this fear, conventionally, as shown in FIG. 3, a mounting screw having a thread 4b to which a conductive claw washer 5 having an insulating film peeling claw 5a is applied to the reflector 2 and a knob 4a is fixed. The reflector 2 was attached to the luminaire body 1 by tightening at 4. When the knob 4a is turned strongly by this attachment, the insulating coating is peeled off by the claw 5a, and at the same time as the attachment, the reflector 2 and the luminaire main body 1 are electrically connected via the conductive claw washer 5 and the conductive attachment screw 4. It is connected and the reflecting plate 2 can be more reliably grounded.

  By the way, for example, the reflector 2 may be removed from the luminaire body 1 for cleaning or repair. In this case, the screw tightening is loosened and the mounting screw 4 is removed, but at this time, the conductive claw washer 5 is dropped and lost. Further, when the screw is loosened due to vibration or the like, there is a problem that the electrical connection is interrupted.

  The problem to be solved by the present invention is that the contact between the member, the conductive claw washer and the conductive screw is reliably maintained, and the conductive claw washer is lost even if the thumb screw fastened to the member is removed. This is to prevent such problems.

  The present invention relates to a member having an insulating coating applied to the entire surface thereof, and a conductive fixture for conductively fixing another conductive member by tightening a conductive thumbscrew by applying a conductive claw washer to the surface of the member. A spring washer and the conductive claw washer are fitted and held in a shaft portion between the thumb of the thumb screw and the screw thread.

  In the conductive fixing device according to the present invention, the spring washer and the conductive claw washer are fitted and held in the shaft portion having a diameter smaller than the thread of the thumb screw, so that it is easy to tighten with the spring washer and fix the screw. Thus, the claw of the conductive claw washer is kept in a state where it is bitten into the member, the screw is not loosened due to vibration or the like, and the end of the conductive screw thread comes into contact with certainty. Even if the thumb screw fastened to the member is removed, the spring washer and the conductive claw washer can be removed while being held by the thumb screw, and the spring washer and the conductive claw washer are not lost.

  The purpose of the spring washer is to maintain the contact of the member, the conductive claw washer and the conductive screw securely, and to prevent the conductive claw washer from being lost even if the thumbscrew tightened to the member is removed. This was realized by fitting and holding the conductive claw washer in the conductive shaft portion having a smaller diameter than the screw thread between the knob and the screw thread portion.

  FIG. 1 is an assembly view of a conductive fixture according to an embodiment of the present invention. In FIG. 1, 11 is a conductive member such as a lighting fixture body, 12 is a member such as a reflector having an insulating coating applied to the entire surface of the conductive member, 14 is a thumbscrew, 15 is a conductive claw washer, 16 Is a spring washer. The thumb screw 14 has a knob 14b fixed to one end of a conductive shaft 14a, and a thread 14c having a diameter larger than the diameter of the shaft is formed at an appropriate distance from the knob 14b.

  The conductive claw washer 15 is formed of an annular conductive metal plate, and a claw 15a is formed by making a notch on the outer periphery and bending the cut at a substantially right angle downward from the notch. The diameter of the shaft 14a of the thumbscrew 14 is substantially smaller than the diameter of the thread 14c. Then, the tip of the claw 15a is applied to the member 12 having an insulating coating applied to the entire surface, the spring washer 16 is overlaid on the conductive claw washer 15, and the thread 14c of the thumb screw 14 is connected to the spring washer 16 and the conductive claw. The washer 15 and the member 12 are penetrated, and the knob is turned and fixed to the conductive member 11 by screwing.

  By this screw tightening, the claw 15a of the conductive claw washer 15 breaks through the insulating coating film of the member 12 and bites into the member 12, and the member 12 is electrically connected to the member 11 via the conductive claw washer 15 and the thumbscrew 14. At the same time, the member 12 is mechanically fixed to the member 11. Further, the spring washer 16 and the conductive claw washer 15 are fitted into a small-diameter shaft portion 14a beyond the thread 14c of the thumbscrew 14, and the spring washer 16 and the conductive claw are removed even if the thumbscrew 14 is removed from the members 11 and 12. The washer 15 is held by the thumbscrew 14. The spring washer 16 and the conductive claw washer 15 may be fitted and held in advance on the shaft portion 14a between the knob 14a and the screw thread 14c of the thumb screw 14.

It is an assembly view of the conductive fixture according to the embodiment of the present invention. It is an assembly perspective view of a lighting fixture. It is explanatory drawing which shows the structure of the conventional conductive fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Conductive member 12 Member with insulating coating applied to the entire surface 14 Thumb screw 14a Shaft 14b Knob 14c Screw thread 15 Conductive claw washer 15a Claw 16 Spring washer

Claims (1)

  In the conductive fixing device for electrically fixing a member having an insulating coating applied to the entire surface and a conductive claw washer on the surface of the member and fixing the conductive member to another conductive member by tightening the conductive thumb screw. A conductive fixture comprising a spring washer and the conductive claw washer fitted and held in a shaft portion between the knob and the screw thread.

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