WO2010064087A1 - A lockable three-pin switch socket - Google Patents

A lockable three-pin switch socket Download PDF

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Publication number
WO2010064087A1
WO2010064087A1 PCT/IB2008/055109 IB2008055109W WO2010064087A1 WO 2010064087 A1 WO2010064087 A1 WO 2010064087A1 IB 2008055109 W IB2008055109 W IB 2008055109W WO 2010064087 A1 WO2010064087 A1 WO 2010064087A1
Authority
WO
WIPO (PCT)
Prior art keywords
pin
switch
locking
blanking mechanism
blanking
Prior art date
Application number
PCT/IB2008/055109
Other languages
French (fr)
Inventor
Ah Kow Hew
Original Assignee
Lee, Yip Fong
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lee, Yip Fong filed Critical Lee, Yip Fong
Priority to PCT/IB2008/055109 priority Critical patent/WO2010064087A1/en
Priority to CN2008901003128U priority patent/CN202167656U/en
Publication of WO2010064087A1 publication Critical patent/WO2010064087A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/44—Means for preventing access to live contacts
    • H01R13/447—Shutter or cover plate
    • H01R13/453—Shutter or cover plate opened by engagement of counterpart
    • H01R13/4538—Covers sliding or withdrawing in the direction of engagement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/20—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling

Definitions

  • the present invention relates generally to a three-pin switch socket. It relates specifically to a lockable three-pin switch socket where a spring-loaded locking and blanking mechanism is applied to lock the on-off switch and to blank the pin openings when the socket is not plugged.
  • a traditional three-pin switch socket has an on-off switch and three pin openings to receive a plug. When the plug is removed, the pin openings are exposed. The on-off switch is always free to be switched on and off. If any metallic element is accidentally inserted to the live pin opening, electrical current will be transmitted, causing an electrocution. There has been several reporting of such accidents.
  • the present invention has therefore as a primary object to blank off three pin openings of a three-pin switch socket while locking its on-off switch when the three- pin switch socket is not plugged.
  • a substantially U-shaped bracket is integrally provided at the back of the three-pin switch socket below the on-off switch and the three pin openings.
  • a locking and blanking mechanism is disposed in between the on- off switch, the three pin openings and the substantially U-shaped bracket.
  • the locking and blanking mechanism further comprises an integral assembly of an inverted T- shaped arm attached to a second vertical arm disposed at its side, the inverted T-shaped arm having a first vertical arm and two side arms.
  • the two side arms blank the two bottom pin openings of the three-pin switch socket and the first vertical arm blanks the top pin opening; and the bases of the first and the second vertical arms include each a housing to receive a spring.
  • the tip of the second vertical arm engages the on-off switch and locks it.
  • Another object of the present invention is to provide a lockable three-pin switch socket to two or more three-pin switch sockets in a gang.
  • Figure Ia is a perspective view of a locking and blanking mechanism, with to- be-loaded springs, made in accordance to the present invention.
  • Figure Ib is a reversed view of the spring-loaded locking and blanking mechanism as shown in Figure Ia.
  • Figure 2a is a back view of a three-pin switch socket installed with the spring-loaded locking and blanking mechanism made in accordance to the present invention, when a three-pin plug has been inserted.
  • Figure 2b is a partial side cross-section view of the locking and blanking mechanism taken along an on-off switch as shown in Figure 2a, whence the on-off switch is disengaged from the locking and blanking mechanism.
  • Figure 2c is a perspective front view of the three-pin switch socket, showing the three-pin plug being partially inserted and the position of the locking and blanking mechanism in dotted lines, without showing the springs and a substantially U-shaped bracket.
  • Figure 3a is a back view of the three-pin switch socket installed with the spring- loaded locking and blanking mechanism made in accordance to the present invention, when the three-pin plug has been removed.
  • Figure 3b is a partial side cross-section view of the locking and blanking mechanism taken along the on-off switch as shown in Figure 3a, whence the on-off switch is engaged and locked by the locking and blanking mechanism.
  • Figure 4a shows a perspective view of a gang of two three-pin switch sockets made in accordance to the present invention, with a three-pin plug being inserted into the right-hand three-pin switch socket, and the positions of the two locking and blanking mechanisms in dotted lines.
  • Figure 4b shows a back view of a gang of two three-pin switch sockets made in accordance to the present invention, with a three-pin plug being inserted into the left- hand three-pin switch socket, and the positions of the two locking and blanking mechanisms.
  • a traditional three-pin switch socket carries an on-off switch (11), and three pin openings (12, 13). With the assistance of an electrical circuitry, the on-off switch (11) can be connected electrically when a three-pin plug (40) is inserted.
  • the three pin openings (13, 12) assume the positions of one top pin opening (13) and two bottom pin openings (12).
  • a locking and blanking mechanism (20) is appropriately disposed behind and inside the three-pin switch socket (10).
  • a substantially U-shaped bracket (30) is integrally provided at the back of the three-pin switch socket (10), so that the locking and blanking mechanism (20) is disposed thereon.
  • the locking and blanking mechanism (20) comprises an integral assembly of an inverted T-shaped arm attached to a second vertical arm (22) disposed at its side.
  • the inverted T-shaped arm has a first vertical arm (21) and two side arms (23).
  • the two side arms (23) blank the two bottom pin openings (12) and the first vertical arm (21) blanks the top pin opening (13).
  • the bases of the first and the second vertical arms (21, 22) include each a housing (25) to receive a spring (24).
  • the two springs (24) are disposed in between the housings (25) of the first and the second vertical arms (21, 22) and the substantially U-shaped bracket (30). These provide the spring-loaded action to the locking and blanking mechanism (20).
  • At least a vertical guide (31) is provided to allow the locking and blanking mechanism (20) to move up and down.
  • the present invention teaches a method of locking an on-off switch (11) and blanking the three pin openings (12, 13) with a spring-loaded locking and blanking mechanism (20), which is operable by the insertion and removal of a three-pin plug (40).
  • the method includes the steps of providing a substantially U-shaped bracket (30) at the back of a three-pin switch socket (10) below the on-off switch (11) and the three pin openings (12, 13); providing an integral spring- loaded locking and blanking mechanism (20) of two first and second vertical arms (21, 22) and two side arms (23), whence the locking and blanking mechanism (20) is allowed to move up and down; disposing the spring-loaded locking and blanking mechanism (20) in between the substantially U-shaped bracket (30) and the on-off switch (11) and the three pin openings (12, 13); locking the on-off switch (11) with the tip of the second vertical arm (22); and blanking the three pin openings (13, 12) with the first vertical arm (21) and the two side arms (23); whereby the spring-loaded locking and blanking mechanism (20) is operable by the insertion and removal of a three-pin plug (40) into and from the three pin openings (12, 13).
  • the method of the present invention is also applicable to a gang of multiple three-pin switch sockets.
  • the method includes the steps of providing a substantially U-shaped bracket (30) at the back of each three-pin switch socket (10) below the on-off switch (11) and three pin openings (12, 13); providing an integral spring- loaded locking and blanking mechanism (20) of two first and second vertical arms (21, 22) and two side arms (23), whence the locking and blanking mechanism (20) is allowed to move up and down; disposing the spring-loaded locking and blanking mechanism (20) in between each substantially U-shaped bracket (30) and the on-off switch (11) and the three pin openings (12, 13) of each three-pin switch socket (10); locking the on-off switch (11) with the tip of the second vertical arm (22); and blanking the three openings (13, 12) with the first vertical arm (21) and the two side arms (23); whereby the spring-loaded locking and blanking mechanism (20) is operable by the insertion and removal of a three-pin plug (40) into and
  • the present invention in the form of a lockable three-pin switch socket (10) can be wall-mounted, or applied to a trailing extension cord of multiple three-pin switch sockets.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Abstract

According to the teaching of this present invention, a substantially U-shaped bracket (30) is integrally provided at the back of a three-pin switch socket (10) including an on-off switch (11) and three pin openings (12, 13). A locking and blanking mechanism (20) is disposed in between the on-off switch (11), the three pin openings (12, 13) and the substantially U-shaped bracket (30). The locking and blanking mechanism (20) further comprises an integral assembly of an inverted T-shaped arm attached to a second vertical arm (22) disposed at its side, the inverted T-shaped arm having a first vertical arm (21) and two side arms (23); the two side arms (23) blanking the two bottom pin openings (12); the first vertical arm (21) blanking the top pin opening (13); and the bases of the first and second vertical arms (21, 22) including each a housing (25) to receive a spring (24). The locking and blanking mechanism (20) blanks off the three pin openings (12, 13) of the three-pin switch socket (10) and locks up the on-off switch (11), when the three-pin switch socket (10) is not plugged; and the locking and blanking mechanism (20) moves clear of the three pin openings (12, 13) and unlocks the on-off switch (11), when the three-pin switch socket (10) is plugged. The locking and blanking mechanism (20) and the substantially U-shaped bracket (30) are applicable to each three-pin switch socket (10) individually, or in a gang of multiple three-pin switch sockets. The present invention teaches a method of locking an on-off switch (11) and blanking the three pin openings (12, 13) with a spring-loaded locking and blanking mechanism (20) which is operable by the insertion and removal of a three-pin plug (40). The method is also applicable to a gang of multiple three-pin switch sockets.

Description

Description
A LOCKABLE THREE-PIN SWITCH SOCKET
Technical Field
[1] The present invention relates generally to a three-pin switch socket. It relates specifically to a lockable three-pin switch socket where a spring-loaded locking and blanking mechanism is applied to lock the on-off switch and to blank the pin openings when the socket is not plugged. Background Art
[2] A traditional three-pin switch socket has an on-off switch and three pin openings to receive a plug. When the plug is removed, the pin openings are exposed. The on-off switch is always free to be switched on and off. If any metallic element is accidentally inserted to the live pin opening, electrical current will be transmitted, causing an electrocution. There has been several reporting of such accidents.
[3] Several prior art safety measures are employed to rectify the above problem. One method is to employ a blank plug to close off the pin openings of the three-pin switch socket. Another method is to employ an internal spring-loaded blanking mechanism, which will blank off the pin openings, whenever a plug is removed. However, the on- off switch is always free to be switched on and off. Summary of the Invention
[4] The present invention has therefore as a primary object to blank off three pin openings of a three-pin switch socket while locking its on-off switch when the three- pin switch socket is not plugged.
[5] This primary object is achieved in that a substantially U-shaped bracket is integrally provided at the back of the three-pin switch socket below the on-off switch and the three pin openings. A locking and blanking mechanism is disposed in between the on- off switch, the three pin openings and the substantially U-shaped bracket. The locking and blanking mechanism further comprises an integral assembly of an inverted T- shaped arm attached to a second vertical arm disposed at its side, the inverted T-shaped arm having a first vertical arm and two side arms. The two side arms blank the two bottom pin openings of the three-pin switch socket and the first vertical arm blanks the top pin opening; and the bases of the first and the second vertical arms include each a housing to receive a spring. The tip of the second vertical arm engages the on-off switch and locks it.
[6] Another object of the present invention is to provide a lockable three-pin switch socket to two or more three-pin switch sockets in a gang.
[7] These and other objects will become evident, following the disclosure below. Brief Description of the Drawings
[8] In order that the present invention may be more readily understood, the following description is given, by way of example, of one specific embodiment in accordance to the present invention. Reference is made to the accompanying drawings, in which:
[9] Figure Ia is a perspective view of a locking and blanking mechanism, with to- be-loaded springs, made in accordance to the present invention.
[10] Figure Ib is a reversed view of the spring-loaded locking and blanking mechanism as shown in Figure Ia.
[11] Figure 2a is a back view of a three-pin switch socket installed with the spring-loaded locking and blanking mechanism made in accordance to the present invention, when a three-pin plug has been inserted.
[12] Figure 2b is a partial side cross-section view of the locking and blanking mechanism taken along an on-off switch as shown in Figure 2a, whence the on-off switch is disengaged from the locking and blanking mechanism.
[13] Figure 2c is a perspective front view of the three-pin switch socket, showing the three-pin plug being partially inserted and the position of the locking and blanking mechanism in dotted lines, without showing the springs and a substantially U-shaped bracket.
[14] Figure 3a is a back view of the three-pin switch socket installed with the spring- loaded locking and blanking mechanism made in accordance to the present invention, when the three-pin plug has been removed.
[15] Figure 3b is a partial side cross-section view of the locking and blanking mechanism taken along the on-off switch as shown in Figure 3a, whence the on-off switch is engaged and locked by the locking and blanking mechanism.
[16] Figure 4a shows a perspective view of a gang of two three-pin switch sockets made in accordance to the present invention, with a three-pin plug being inserted into the right-hand three-pin switch socket, and the positions of the two locking and blanking mechanisms in dotted lines.
[17] Figure 4b shows a back view of a gang of two three-pin switch sockets made in accordance to the present invention, with a three-pin plug being inserted into the left- hand three-pin switch socket, and the positions of the two locking and blanking mechanisms.
Disclosure of Invention Detailed Description of the Invention
[18] A traditional three-pin switch socket carries an on-off switch (11), and three pin openings (12, 13). With the assistance of an electrical circuitry, the on-off switch (11) can be connected electrically when a three-pin plug (40) is inserted. The three pin openings (13, 12) assume the positions of one top pin opening (13) and two bottom pin openings (12).
[19] In order to effect a locking action on the on-off switch (11) of a three-pin switch socket (10), a locking and blanking mechanism (20) is appropriately disposed behind and inside the three-pin switch socket (10). A substantially U-shaped bracket (30) is integrally provided at the back of the three-pin switch socket (10), so that the locking and blanking mechanism (20) is disposed thereon.
[20] As seen in Figures Ia and Ib, the locking and blanking mechanism (20) comprises an integral assembly of an inverted T-shaped arm attached to a second vertical arm (22) disposed at its side. The inverted T-shaped arm has a first vertical arm (21) and two side arms (23). The two side arms (23) blank the two bottom pin openings (12) and the first vertical arm (21) blanks the top pin opening (13). The bases of the first and the second vertical arms (21, 22) include each a housing (25) to receive a spring (24). The two springs (24) are disposed in between the housings (25) of the first and the second vertical arms (21, 22) and the substantially U-shaped bracket (30). These provide the spring-loaded action to the locking and blanking mechanism (20). At least a vertical guide (31) is provided to allow the locking and blanking mechanism (20) to move up and down.
[21] As seen in Figures 2a, 2b and 2c, a three-pin plug (40) has been inserted to the three- pin switch socket (10). The first vertical arm (21) and the two side arms (23) are urged to move downward, while moving the tip of the second vertical arm (22) away from the on-off switch (11). The on-off switch (11) is thus disengaged.
[22] As seen in Figures 3 a and 3b, the three-pin plug (40) has been removed from the three-pin switch socket (10). The springs (24) in the housings (25) of the first and the second vertical arms (21, 22) would urge the locking and blanking mechanism (20) to move upwardly. The tip of the second vertical arm (22) engages the on-off switch (11) and locks it; while the first vertical arm (21) and the two side arms (23) blank off the three pin openings (13, 12).
[23] It must be understood that the teaching of the present invention can be easily applied to a gang of multiple three-pin switch sockets. The exact design of the locking and blanking mechanism (20) is determined by the location of the on-off switch (11) in relation with that of the three pin openings (12, 13) of a three-pin switch socket (10). In Figures 4a and 4b, a gang of two three-pin switch sockets is shown. The two on-off switches (11) are disposed side by side in the middle of the gang of a left-hand three- pin switch socket and a right-hand three-pin switch socket. The location of each on-off switch (11) can vary on the three-pin switch socket or gang of three-pin switch sockets.
[24] From the above disclosure, it is clear that the present invention teaches a method of locking an on-off switch (11) and blanking the three pin openings (12, 13) with a spring-loaded locking and blanking mechanism (20), which is operable by the insertion and removal of a three-pin plug (40). The method includes the steps of providing a substantially U-shaped bracket (30) at the back of a three-pin switch socket (10) below the on-off switch (11) and the three pin openings (12, 13); providing an integral spring- loaded locking and blanking mechanism (20) of two first and second vertical arms (21, 22) and two side arms (23), whence the locking and blanking mechanism (20) is allowed to move up and down; disposing the spring-loaded locking and blanking mechanism (20) in between the substantially U-shaped bracket (30) and the on-off switch (11) and the three pin openings (12, 13); locking the on-off switch (11) with the tip of the second vertical arm (22); and blanking the three pin openings (13, 12) with the first vertical arm (21) and the two side arms (23); whereby the spring-loaded locking and blanking mechanism (20) is operable by the insertion and removal of a three-pin plug (40) into and from the three pin openings (12, 13).
[25] It is clear that the method of the present invention is also applicable to a gang of multiple three-pin switch sockets. The method includes the steps of providing a substantially U-shaped bracket (30) at the back of each three-pin switch socket (10) below the on-off switch (11) and three pin openings (12, 13); providing an integral spring- loaded locking and blanking mechanism (20) of two first and second vertical arms (21, 22) and two side arms (23), whence the locking and blanking mechanism (20) is allowed to move up and down; disposing the spring-loaded locking and blanking mechanism (20) in between each substantially U-shaped bracket (30) and the on-off switch (11) and the three pin openings (12, 13) of each three-pin switch socket (10); locking the on-off switch (11) with the tip of the second vertical arm (22); and blanking the three openings (13, 12) with the first vertical arm (21) and the two side arms (23); whereby the spring-loaded locking and blanking mechanism (20) is operable by the insertion and removal of a three-pin plug (40) into and from the three pin openings (12, 13) of each three-pin switch socket (10).
[26] To those skilled in the art, the present invention in the form of a lockable three-pin switch socket (10) can be wall-mounted, or applied to a trailing extension cord of multiple three-pin switch sockets.

Claims

Claims
[1] A three-pin switch socket (10) including essentially an on-off switch (11) and three pin openings (12, 13) is characterized in which the back of this three-pin switch socket (10) is integrally provided with a substantially U-shaped bracket (30); a locking and blanking mechanism (20) is disposed in between the on-off switch (11), the three pin openings (12, 13) and the substantially U-shaped bracket (30); and the locking and blanking mechanism (20) further comprises an integral assembly of an inverted T-shaped arm attached to a second vertical arm (22) disposed at its side, the inverted T-shaped arm having a first vertical arm (21) and two side arms (23); the two side arms (23) blanking the two bottom pin openings (12); the first vertical arm (21) blanking the top pin opening (13); and the bases of the first and second vertical arms (21, 22) including each a housing (25) to receive a spring (24), whereby the on-off switch (11) is engaged and locked by the tip of the second vertical arm (22) when the three-pin switch socket (10) is not plugged, urging the spring-loaded locking and blanking mechanism (20) to move up; and the on-off switch (11) is disengaged and unlocked by the tip of the second vertical arm (22) when the three-pin switch socket (10) is plugged, urging the spring-loaded locking and blanking mechanism (20) to move down.
[2] A lockable three-pin switch socket (10) as in Claim 1 in which the spring-loaded locking and blanking mechanism (20) blanks off the three pin openings (12, 13) of the three-pin switch socket (10) and locks up the on-off switch (11), when the three-pin switch socket (10) is not plugged; and the locking and blanking mechanism (20) moves clear of the pin openings (12, 13) and unlocks the on-off switch (11), when the three-pin switch socket (10) is plugged.
[3] A lockable three-pin switch socket (10) as in Claim 1 in which the spring-loaded locking and blanking mechanism (20) and the substantially U-shaped bracket (30) are applicable to each three-pin switch socket (10) individually, or in a gang of multiple three-pin switch sockets.
[4] A method of locking an on-off switch (11) and blanking three pin openings (12,
13) of a three-pin switch socket (10) includes the steps of providing a substantially U-shaped bracket (30) at the back of the three-pin switch socket (10) below the on-off switch (11) and three pin openings (12, 13); providing an integral spring-loaded locking and blanking mechanism (20) of two first and second vertical arms (21, 22) and two side arms (23), whence the locking and blanking mechanism (20) is allowed to move up and down; disposing the spring-loaded locking and blanking mechanism (20) in between the substantially U-shaped bracket (30) and the on-off switch (11) and the three pin openings (12, 13); locking the on-off switch (11) with the tip of the second vertical arm (22); and blanking the three pin openings (13, 12) with the first vertical arm (21) and the two side arms (23); whereby the spring-loaded locking and blanking mechanism (20) is operable by the insertion and removal of a three-pin plug (40) into and from the three pin openings (12, 13).
[5] A method of locking an on-off switch (11) and blanking three pin openings (12,
13) of a three-pin switch socket (10) in a gang of multiple three-pin switch sockets includes the steps of providing a substantially U-shaped bracket (30) at the back of each three-pin switch socket (10) below the on-off switch (11) and three pin openings (12, 13); providing an integral spring-loaded locking and blanking mechanism (20) of two first and second vertical arms (21, 22) and two side arms (23), whence the locking and blanking mechanism (20) is allowed to move up and down; disposing the spring-loaded locking and blanking mechanism (20) in between each substantially U-shaped bracket (30) and the on-off switch (11) and the three pin openings (12, 13) of each three-pin switch socket (10); locking the on-off switch (11) with the tip of the second vertical arm (22); and blanking the three pin openings (13, 12) with the first vertical arm (21) and the two side arms (23); whereby the spring-loaded locking and blanking mechanism (20) is operable by the insertion and removal of a three-pin plug (40) into and from the three pin openings (12, 13) of each three-pin switch socket (10).
PCT/IB2008/055109 2008-12-05 2008-12-05 A lockable three-pin switch socket WO2010064087A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/IB2008/055109 WO2010064087A1 (en) 2008-12-05 2008-12-05 A lockable three-pin switch socket
CN2008901003128U CN202167656U (en) 2008-12-05 2008-12-05 Lockable three-legged switch-containing socket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2008/055109 WO2010064087A1 (en) 2008-12-05 2008-12-05 A lockable three-pin switch socket

Publications (1)

Publication Number Publication Date
WO2010064087A1 true WO2010064087A1 (en) 2010-06-10

Family

ID=42232928

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/055109 WO2010064087A1 (en) 2008-12-05 2008-12-05 A lockable three-pin switch socket

Country Status (2)

Country Link
CN (1) CN202167656U (en)
WO (1) WO2010064087A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB487225A (en) * 1936-11-23 1938-06-17 Parsons C H Ltd Improvements relating to electric switches and plug and socket connections
GB913924A (en) * 1958-11-13 1962-12-28 Ashley Accessories Ltd Improvements in or relating to electric plug and socket connectors
US5702259A (en) * 1996-08-12 1997-12-30 Lee; Chiu-Shan Safety socket and plug arrangement
GB2355862A (en) * 1999-09-22 2001-05-02 Steven Smith Mains socket with switch and shutters released by insertion of a plug
GB2378326A (en) * 2001-08-01 2003-02-05 Legrand & Legrand Snc Pin-operated socket outlet shutter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB487225A (en) * 1936-11-23 1938-06-17 Parsons C H Ltd Improvements relating to electric switches and plug and socket connections
GB913924A (en) * 1958-11-13 1962-12-28 Ashley Accessories Ltd Improvements in or relating to electric plug and socket connectors
US5702259A (en) * 1996-08-12 1997-12-30 Lee; Chiu-Shan Safety socket and plug arrangement
GB2355862A (en) * 1999-09-22 2001-05-02 Steven Smith Mains socket with switch and shutters released by insertion of a plug
GB2378326A (en) * 2001-08-01 2003-02-05 Legrand & Legrand Snc Pin-operated socket outlet shutter

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