Safety receptacle for a two-piece duplex

• US 4,758,696 A
• Filed: 09/26/1986
• Issued: 07/19/1988
• Est. Priority Date: 09/26/1986
• Status: Expired due to Fees

• Current Assignee: David T.F. Grazer
• Original Assignee: David T.F. Grazer
• Inventors: Grazer, David T. F.
• Primary Examiner(s): Luebke, Renee S.
• Application Number:
  US06/911,975
• Time in Patent Office: 662 Days
• Field of Search: 200/51.09, 200/153 P, 200/51.12, 200/51 R
• US Class Current: 200/51.09
• CPC Class Codes: H01R 13/7036 the switch being in series with coupling part, e.g. dead coupling, explosion proof coupling

Abstract

A safety receptacle for a two-piece duplex is disclosed. A pin is removably attached to a conventional male electric plug so that the pin extends outward in the same direction as the male plug'"'"'s blades. A female electrical receptacle having at least one pair of hot/neutral slots encased in a housing, and adapted to receive the male blades, also includes a sleeve adapted to receive the pin.

A nonconductive, spring tensioned rack and pinion gear assembly is aligned to be workably connected to the pin. Each arm of a conductive pair of pivotal arms is connected at its one end to an electrical source and to the pinion. Each arm is aligned at its other end to make electrical contact with one of the pair of male blades so that when the pin is inserted into the sleeve, the pin engages and retracts the rack to a tensioned position, causing the pinion to rotate and pivot each of the arms into contact with the corresponding slot and thereby render the socket live. Removal of the male plug, and consequently the pin, causes the spring to relax, thereby urging the rack forward, causing each of the arms to pivot and break contact with the corresponding slot housing, thereby rendering the socket dead.

Claims

1. A safety receptacle and plug comprising:

(a) a male plug including two parallel blades extending outward from said plug at one plug end and an elongated pin interposed between said blades and extending from said plug end parallel to said blades; and

,

(b) a female receptacle including;

(i) a housing having at least one pair of hot/neutral slots encased therein and adapted to receive said male plug'"'"'s male blades;

(ii) a sleeve located in said housing, said sleeve having two ends and four sides and including at one sleeve end an extension to abut said pin when said plug'"'"'s blades are received by said receptacle;

(iii) a nonconductive tensioned rack including a spring for tensioning, said rack in linear alignment to and abutting one of said sleeve'"'"'s sides;

(iv) a nonconductive pinion workably engaging said rack; and

,

(v) a conductive pair of pivotal arms located in a plane parallel to said hot/neutral slots, each said arm having an inner and an outer side and two ends, each said arm connected to a first arm end to an electrical source and to said pinion, each said arm'"'"'s other end aligned to pivotably make electrical contact with one each of said hot/neutral slots,

so that when said male plug is inserted in said housing, said pin engages said sleeve extension and presses against said extension causing said rack to retract, whreby said pinion rotates and pivots each said arm into contact with said hot/neutral slot to thereby render said socket live, and removal of said plug, and consequently said pin, allows said spring to relax, thereby urging said rack forward to cause each said arm to pivot and discontinue contact with said slot, thereby breaking electrical contact and rendering said socket dead.

2. The device according to claim 1 wherein said sleeve is interposed between said pair of hot/neutral slots.

3. The device according to claim 1 wherein said rack is attached to one of said sleeve'"'"'s sides between said spring and said sleeve extension.

4. The device according to claim 1 wherein said nonconductive pinion is connected to each said arm by one of a pair of rods, each said rod having two ends, a first end connected to said electrical source and a second end connected to said pinion.

5. The device according to claim 1 wherein said arms are parallel to each other.

6. The device according to claim 5 wherein said pinion is mounted between said arms.

7. The device according to claim 6 wherein each of said arms is connected to said pinion on said arm'"'"'s inner side and connected to said electrical source on said arm'"'"'s outer side at said arm'"'"'s first end.

8. The device according to claim 1 wherein each of said pivotal arms terminates at its said other end in a knob aligned to make electrical contact with a corresponding hot/neutral slot.

9. The device according to claim 8 wherein each said hot/neutral slot includes, additionally, a conductive clip mounted to receive said blade and an aperture to receive said arm'"'"'s knob, said blade thereby making electrical contact with said clip.

10. The device according to claim 1 wherein said housing is conductive at each said hot/neutral slot.