Line switch having a parallel arrangement between conducting plates with piercing tips and the electrical cord

• US 5,854,456 A
• Filed: 07/22/1997
• Issued: 12/29/1998
• Est. Priority Date: 07/22/1997
• Status: Expired due to Fees

• Current Assignee: Liu Lee-Ven
• Original Assignee: Liu Lee-Ven
• Inventors: Lee-ven, Liu
• Primary Examiner(s): Gellner, Michael L.
• Assistant Examiner(s): Hayes, Michael J.
• Application Number:
  US08/898,034
• Time in Patent Office: 525 Days
• Field of Search: 200/11 R, 200/11 TW, 200/298, 200/569, 439/401, 439/418, 439/425, 439/393, 439/658
• US Class Current: 200/11.0TW
• CPC Class Codes: H01H 1/585 and piercing the wire insulation
• CPC Class Codes: H01H 9/0228 Line cord switches

Abstract

A safety switch for controlling electric current between a plug and an appliance comprises generally an upper casing and a lower casing, a pair of copper conduct plates and a swivel disk member rotatably disposed into the casings. The improvement is characterized in that the pair of copper conduct plates each has a pair of staggered tip points pierced into a electrical cord having their flat portions parallel to the longitudinal axis of the cords. So that the tip points will not cut off the wires but stably engage with and grip a certain amount of the wires inside the cord in order to ensure an eligible conductivity of the electricity between the plug and the appliance.

Claims

1. a safety switch for controlling electricity between a plug and an appliance comprising:

an upper casing comprising a first protrudent central bore projected downward from an inner surface thereof, an enclosure wall therearound, a pair of first slots at two ends of said enlcosure wall for receiving a pair of first and second electrical cords which are parallel disposed and connect with a plug and an appliance at two ends respectively with said second cord being broken off inside said casing, a coupling socket projected downward from a corner of each end wall and a pair of ribs formed symmetrically abutting a pair of opposite lateral walls thereof;

a lower casing engageable with said upper casing and secured by means of screw, said lower casing comprising a second protrudent central bore made in registry with said first protrudent central bore, an enclosure wall engageable with the enclosure wall of said upper casing, a pair of elongate slots symmetrically formed in opposing lateral walls, a pair of positioning stems centrally projected inward from adjacent two ends of said enclosure wall thereof each including a vertical retaining slot centrally extended along a longitudinal orientation and a post projected upward at a corner of each end wall engageable with said coupling socket of said tipper casing;

a pair of copper conduct plates secured at two ends of said lower casing therein, said conduct plates each having a flat rectangular portion engaged into the vertical slot of said positioning stems including a pair of tip points parallel projected upward from a top thereof and staggered each other away from a vertical axis, a transverse portion extended from said rectangular portion and abutting said positioning stem, and an elastic conducting portion extended inward from said transverse portion first parallel to said rectangular portion and then bending a predetermined angle and terminated at a position adjacent an opposing periphery of said second protrudent central bore;

a swivel disk member rotatably engaged onto said second protrudent central bore of said lower casing, said disk member comprising a flat circular body of serrated outer circumference, a pair of positioning marks at opposite circumference, a S-shaped protrusion centrally projected downward from a planar portion of said body, an elliptic copper plate attached to a top of said protrusion including a pair of narrower portion extended outward from two ends each having a conducting piece perpendicular to free end thereof and fixedly secured to a vertical portion of opposite ends of said protrusion and a third central bore engageable with said second protrudent central bore formed through said elliptic copper plate and said protrusion;

whereby, said swivel disk member rotates to engage or disengage said conducting pieces with said pair of copper conduct plates inside said casing for controlling the electric current between a plug and an appliance.

2. A safety switch according to claim 1 wherein said tip points of said copper conduct plates have their flat portions parallel to the longitudinal axis of said pair of cords when it pierce into said second electrical cord.

3. A safety switch according to claim 2 wherein said tip points grips a certain amount of wires when it pierce into said second electrical cord.

4. A safety switch according to claim 1 wherein said switch is turned on when the positioning marks of said swivel disk member appear at the elongate slots of said lower casing.

5. A safety switch according to claim 4 wherein said switch is turned off when the positioning marks of said swivel disk member disappear from the elongate slots of said lower casing.