SWITCH-INCORPORATING PLUG SOCKET

• US 3,843,854 A
• Filed: 09/24/1973
• Issued: 10/22/1974
• Est. Priority Date: 05/23/1973
• Status: Expired due to Term

• Current Assignee: Akitoshi Takada, Shinjiro Mori
• Original Assignee: Akitoshi Takada, Shinjiro Mori
• Inventors: Mori, Shinjiro, Takada, Akitoshi
• Primary Examiner(s): Smith, Jr., David
• Application Number:
  US05/400,119
• Time in Patent Office: 393 Days
• Field of Search: 200/51.07,51.08,51.09,5B
• US Class Current: 200/51.09
• CPC Class Codes: H01H 13/18 adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
• CPC Class Codes: H01H 13/40 Blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg
• CPC Class Codes: H01R 13/7036 the switch being in series with coupling part, e.g. dead coupling, explosion proof coupling

Abstract

The switch-incorporating plug socket according to the invention comprises a socket having an interlocking switch provided in a closed compartment thereof, a plug adapted to be inserted into said socket and a union joint for intercoupling said socket and said plug, and is so designed that it establish an electrical connection between an electric equipment connected thereto and a power source only when the union joint is screwed in the intercoupling direction after the plug is inserted into the socket, so that outward discharge otherwise occurring at the engagement or disengagement of the plug socket is prevented and the power can be supplied safely even at a location where there is the danger of explosion.

Claims

1. A switcH-incorporated plug socket comprising a socket having a main body provided with a tapped sleeve, a mount of electrically insulating material fixed to the main body on the opposite side to said tapped sleeve, a plurality of plug receiving members fixed to one end of said mount within said tapped sleeve and respectively opening in the same direction as the direction in which said tapped sleeve is open, metal strips fixed on said mount and electrically connected with said plug receiving members respectively, terminal plates fixed on said mount at locations opposite to said metal strips respectively, a guide rod slidably extending through the center of said mount in parallel to the plug receiving members with one end thereof protruding into said tapped sleeve, said guide rod being enlarged in diameter at the central portion thereof and formed with an annular groove at said enlarged diameter portion perpendicular to the axis thereof, side plates fixed in opposed relation to the opposite side walls of said mount parallel to said metal strips and terminal plates with portions thereof projecting above said mount, a pressing plate of electrically insulating material disposed horizontally with the opposite ends thereof respectively received in openings formed in said side plates, said pressing plate being provided at the central portion with an opening in which said guide rod is extended, contactor strips fixed to the opposite end portions of said pressing plate and adapted to be brought into contact concurrently with said metal strips and terminal plates, means for urging said guide rod constantly towards the tapped sleeve, and leaf springs mounted between the opposite end portions of the pressing plate and the annular groove of the guide rod and adapted to move the pressing plate away from the mount when the guide rod is moved towards the tapped sleeve and to move the same towards the mount when the guide rod is moved in the opposite direction to the tapped sleeve;

and a plug having a main body adapted to be inserted into the tapped sleeve of said socket, plugs provided on the main body and adapted to be received in the plug receiving members of said socket respectively, terminals provided on the main body on the opposite side to said plugs and electrically connected therewith respectively, a plug cover connected to the main body and a plug union threadably mounted around said plug cover for meshing engagement with the tapped sleeve of said socket.

2. A switch-incorporated plug socket according to claim 1, in which the component parts provided on the mount of the socket are enclosed by a cover, with cord connecting portions of the terminal plates only projecting outwardly from said cover.