Fuseless safety magnetic plug

• US 4,345,223 A
• Filed: 10/28/1980
• Issued: 08/17/1982
• Est. Priority Date: 10/28/1980
• Status: Expired due to Term

• Current Assignee: Yu Chien-Chun
• Original Assignee: Yu Chien-Chun
• Inventors: Chien-Chun, Yu
• Primary Examiner(s): SHOOP JR, WILLIAM M
• Application Number:
  US06/201,529
• Time in Patent Office: 658 Days
• Field of Search: 335/2, 335/6, 335/18, 335/27, 335/202, 337/198, 339/147 P, 361/45
• US Class Current: 335/6
• CPC Class Codes: H01H 73/44 reset by push-button, pull-knob or slide
• CPC Class Codes: H01R 13/713 the switch being a safety switch

Abstract

A fuseless safety magnetic plug has a housing structure divided into a base and a cover, a pair of wire coupling devices, a magnetic device for preventing the plug from overloading, and two prongs for making electrical connections. The wire coupling devices require no instrument or disassembly of the plug for terminating a power cord because the connection can be made simply by inserting ends of the cord into the wire coupling devices from the outside of the plug. The magnetic device comprising a pair of electromagnetic members, a cam mechanism, a plurality of movable plates, a metal stud, a reverse spring, and a load discharging bolt, is mounted within the housing structure for controlling the current flowing through channels thereof and for breaking the circuit if any one of the channels is overloaded, while it resumes normal conduction by pressing down the load discharging bolt over the cover after the trouble is removed therefrom. Moreover, this plug is available for various electrical appliances by setting a current adjusting device thereat or by providing it with a rear socket means therein.

Claims

1. A fuseless safety magnetic plug comprising:

a housing structure having a base with at least two electrical channels therein, a cover, and two prongs;

a pair of wire coupling devices mounted on the base;

a magnetic device connected respectively to each of said electrical channels on the base for protecting the plug from overloading by automatically breaking the circuit to open;

a current adjusting device matching with the magnetic device for setting different current load therein;

a cam mechanism matching with said magnetic device for circuit breaking; and

a load discharging bolt matching with said cam mechanism for circuit re-connection after circuit breaking whereby said magnetic plug can effectively maintain the circuit connected thereto in safe condition, and be adaptable to different current requirements of various electrical appliances.

2. A safety magnetic plug as claimed in claim 1 wherein each of said wire coupling devices having a wire insertion base with an orifice on a cross member thereof, an plastical coupling plate with an orifice on a bent end thereof, and a wire locking bolt for making wire termination, is mounted on each electrical channel on the base, with the orifice of the coupling plate positioned over the orifice of the cross member of the wire insertion base so that when pressing down the wire locking bolt, the two orifices will be in the same axis for wire end insertion, and firmly holding the wire end in position when the wire locking bolt thereof is released.

3. A safety magnetic plug as claimed in claim 1 wherein said magnetic device further comprises:

a solenoid having two terminals for electrical connections and installed on the electrical channels of the housing base;

a magnetic device cover placed over the solenoid;

a magnetic plate having a lug on the inner edge thereof and movably coupled with the magnetic device cover, subjecting to the control of a magnetic force produced on the solenoid;

a movable plate in a fixing frame installed between the two electrical channels with both edges covered by the lug of the magnetic plate for breaking the circuit whereby said magnetic device is capable of automatically breaking the circuit when it is overloaded.

4. A safety magnetic plug as claimed in claim 1 wherein said current adjusting device comprises:

a lower adjusting knob having a slant surface on the bottom thereof with two stop blocks at both ends thereof;

an upper adjusting knob coupled with the lower adjusting knob with the head protruding over the surface of the cover;

a reverse spring with one end contacting the inner surface of the movable plate and the other end pressed under the slant surface of the lower adjusting knob whereby said current adjusting knob is capable of making current setting by adjusting the tension of the reverse spring under the lower adjusting knob.

5. A safety magnetic plug as claimed in claim 1 wherein said cam mechanism comprises:

a platinoid contacting pin secured on the base with a conductor connected to a terminal of the solenoid;

a spring plate with a protrusion at one end installed on the housing with the protrusion laid over the platinoid contacting pin;

two cams on both ends thereof and control wheel in the middle installed on the base with the two cams laid over the spring plates thereof; and

a metal stud installed with one end on the middle surface of the control wheel and the other end loosely controlled by the movable plate whereby said cam mechanism can be effectively controlled by the magnetic device for breaking the circuit when it is overloaded.