US1955146A - Locking plug for electric circuits - Google Patents

Locking plug for electric circuits Download PDF

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Publication number
US1955146A
US1955146A US489915A US48991530A US1955146A US 1955146 A US1955146 A US 1955146A US 489915 A US489915 A US 489915A US 48991530 A US48991530 A US 48991530A US 1955146 A US1955146 A US 1955146A
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United States
Prior art keywords
plate
plug
body portion
head
socket
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Expired - Lifetime
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US489915A
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Frederick E Reinhold
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Individual
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Individual
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Priority to US489915A priority Critical patent/US1955146A/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02Details
    • H01H85/24Means for preventing insertion of incorrect fuse

Definitions

  • This invention relates generally to electrical service equipment, more specifically to plugs adapted to be positionedin fuse boxes, cut-outs or the like to replace fuses to form a seal when it is desired to discontinue service therefrom.
  • the broad object of this invention is to provide a plug of the type referred to which cannot be removed from a socket or the like by unauthorized persons.
  • Another object of this invention is to provide a plug of the character stated which cannot be removed from a socket except by a special tool.
  • a further object of the present invention is to provide a plug constructed in such a manner that it cannot be removed from a socket with sharp pointed tools, such as chisels or the like.
  • Fig. 1 is a front elevation of a cut-out block with a plug of the present invention in inoperative position in the socket thereon;
  • Fig. 2 is a cross section taken substantially on line 2-2 of Fig. 1;
  • Fig. 3 is a section taken through the improved plu
  • Fig. 4 is a perspective view of the upper movable ring forming a part of the improved plug;
  • Fig. 5 is a perspective View of the stationary ring secured to the plug body
  • Fig. 6 is a top plan view of a slightly modified form of plug, parts being broken away to show other parts;
  • Fig. '7 is a section taken on line '77 of Fig. 6;
  • Fig. 8 is a top plan view of a plug showing a modified means of securing the movable plate to the plug body;
  • Fig. 9 is a section taken on line 9-9 of Fig. 8;
  • Fig. 10 is a section taken through the wrench employed to apply or remove the improved plug.
  • Fig. 11 is an end view of the wrench shown in Fig. 10.
  • 10 designates a standard cut-out block formed of porcelain or the like including a base 12 having an annular flange 13 formed thereon in which is mounted a socket 11 in which is normally positioned a standard fuse (not shown) which is i adapted to be replaced by the improved plug generally designated at 16.
  • Socket 11 consists of a threaded sleeve 14 provided with a bottom portion 18 upon which is mounted a disk 19 formed of insulating material,
  • the sleeve being secured to the base by a bolt 20 and nut 21 which also engages a lead 22 extending from a conductor 23, the bolt also serving as a center contact for the fuse above referred to, a circuit being completed through the fuse by a metal strip 24; positioned between the base 12 and bottom portion of the sleeve and leading to a conductor 25.
  • the improved plug consists of a body portion formed of insulating material, preferably Bakelite, and is externally threaded as indicated at 31 in order that it may be screwed into the sleeve.
  • a metallic plate 34 which is rigidly held in place thereon by portions of the body portion indicated at 35 extending into apertures 36 having tapered sides, connection between the body portion and the plate being effected while the body portion is in a pliable condition.
  • a rotatable plate 38 Positioned on the plate 34 is a rotatable plate 38 which is held in place thereon by a head 39 of a rivet 40 engaging a tapered opening 42 formed in said plate.
  • the head is formed on a shank 43 extending through an opening 44 formed in the plate 34, the rivet being secured to the body portion by split or bifurcated ends 45 formed on the shank 43 which are embedded in the body portion.
  • the plate 38 and head 39 of the rivet are preferably casehardened for a purpose hereinafter described.
  • the fixed plate 34 has a fiat portion 47 formed in its circular side wall
  • the movable plate 38 has a corresponding flat portion 46 formed in its side wall.
  • the fiat portions 46 and 47 are brought into register so that the wrench 50 may engage the fixed plate 34, the plug may then be firmly screwed into the sleeve. After removing the wrench from the plug, the plate 38 is free to turn upon the shank of the rivet. Hence should an attempt be made to remove the plug with a sharp tool, such as a chisel or the like, the plate 38 will merely rotate without having any effect whatever upon removthe plug from the socket with tools other than the wrench.
  • the body portion is provided with a recess 52 to accommodate the center contact when the plug is screwed into the sleeve, it being understood, however, that the body portion may be formed of conductive material and arranged to engage said contact when it is desired to form a circuit or make solid through the plug.
  • a slightly modified form of plug is shown, the construction being exactly the same as above described except that the rivet designated at 54 has a shank 55 extending through aligned openings formed in the plate 38 and body portion, and is held in place by a head 56 engaging a washer disposed in the recess 52.
  • the plug illustrated in Figs. 8 and 9 is substantially the same construction as shown in Figs. 1 to '7 inclusive, except that a pin 58 is Welded or otherwise secured to the plate 38 as indicated at 59, a head 60 being formed thereon which serves to hold the parts in assembled relation.
  • a plug comprising an annular body portion formed of insulating material, a plate secured to said body portion, a second plate rotatably mounted on said first plate, and means for connecting said second plate to said body portion, whereby said second plate may rotate upon said first plate, said first and second plates having surfaces formed thereon adapted to be engaged by a socket wrench for insertion of the plug into a socket of the character described.
  • a plug comprising a body portion formed of insulating material and externally screw threaded, a plate secured to said body portion, a second plate mounted on said first plate, a rivet, said rivet having a head engaging an opening formed in said second plate, a shank extending through an opening in said first plate, and projections formed on the shank of said rivet embedded in said body portion holding said second plate in rotatable engagement with said first plate.
  • a plug comprising an annular body formed of insulating material and externally screw threaded, a metal plate mounted on said body portion and secured thereto by portions of said body portion extending into apertures formed in said plate, a second metal plate mounted on said first plate, and a member rotatably connecting said second plate to said body portion, said first and second plates having fiat portions formed in their circular side walls adapted to be engaged. by a wrench for insertion of the plug into a socket.
  • a plug threaded therein having a circular head provided with a mutilated periphery, and a circular metal plate having a mutilated periphery corresponding to the mutilated periphery of the head rotatably secured to said plug head, said head and plate adapted to be engaged with a wrench when inserting or removing the plug from the socket.
  • a locking plug for electric sockets and the like comprising a cylindrical body portion having a circular head of less diameter than the body portion, the periph ry of said head being mutilated, and a circular metal plate of substantially diameter as the head portion rotatably secured thereto, said plate having a mutilated periphery similar to the periphery of the head of the body portion.
  • a locking plug for fuse sockets and the like comprising an externally threaded body portion having a circular head of less diameter than the body portion, the periphery of said head being mutilated, a circular metal plate of substantially the same diameter as the head rotatably secured to said head, the periphery of said plate being mutilated similar to the head of the body portion, and means for temporarily holding the metal plate in locked engagement with the head of the body portion during the insertion of the locking plug into the socket.

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  • Connector Housings Or Holding Contact Members (AREA)

Description

April 1934- F. E. REINHOLD 1,955,146
LOCKING PLUG FOR ELECTRIC CIRCUITS Filed Oct. 20, 1930 9 54 35 3 34 34 WIN/? 52 Patented Apr. 17, 1934 it St rss aren't 7 Claims.
This invention relates generally to electrical service equipment, more specifically to plugs adapted to be positionedin fuse boxes, cut-outs or the like to replace fuses to form a seal when it is desired to discontinue service therefrom.
The broad object of this invention is to provide a plug of the type referred to which cannot be removed from a socket or the like by unauthorized persons.
Another object of this invention is to provide a plug of the character stated which cannot be removed from a socket except by a special tool.
A further object of the present invention is to provide a plug constructed in such a manner that it cannot be removed from a socket with sharp pointed tools, such as chisels or the like.
Other objects and advantages will be apparent from the following description, reference being had to the accompanying drawing, in which:
Fig. 1 is a front elevation of a cut-out block with a plug of the present invention in inoperative position in the socket thereon;
Fig. 2 is a cross section taken substantially on line 2-2 of Fig. 1;
Fig. 3 is a section taken through the improved plu Fig. 4 is a perspective view of the upper movable ring forming a part of the improved plug;
Fig. 5 is a perspective View of the stationary ring secured to the plug body;
Fig. 6 is a top plan view of a slightly modified form of plug, parts being broken away to show other parts;
Fig. '7 is a section taken on line '77 of Fig. 6;
Fig. 8 is a top plan view of a plug showing a modified means of securing the movable plate to the plug body;
Fig. 9 is a section taken on line 9-9 of Fig. 8;
Fig. 10 is a section taken through the wrench employed to apply or remove the improved plug; and,
Fig. 11 is an end view of the wrench shown in Fig. 10.
Referring more specifically to the drawing, 10 designates a standard cut-out block formed of porcelain or the like including a base 12 having an annular flange 13 formed thereon in which is mounted a socket 11 in which is normally positioned a standard fuse (not shown) which is i adapted to be replaced by the improved plug generally designated at 16.
Socket 11 consists of a threaded sleeve 14 provided with a bottom portion 18 upon which is mounted a disk 19 formed of insulating material,
1 the sleeve being secured to the base by a bolt 20 and nut 21 which also engages a lead 22 extending from a conductor 23, the bolt also serving as a center contact for the fuse above referred to, a circuit being completed through the fuse by a metal strip 24; positioned between the base 12 and bottom portion of the sleeve and leading to a conductor 25.
Referring more specifically to Figs. 3, l and 5, the improved plug consists of a body portion formed of insulating material, preferably Bakelite, and is externally threaded as indicated at 31 in order that it may be screwed into the sleeve.
Mounted on the upper face 32 of the body portion is a metallic plate 34 which is rigidly held in place thereon by portions of the body portion indicated at 35 extending into apertures 36 having tapered sides, connection between the body portion and the plate being effected while the body portion is in a pliable condition.
Positioned on the plate 34 is a rotatable plate 38 which is held in place thereon by a head 39 of a rivet 40 engaging a tapered opening 42 formed in said plate. The head is formed on a shank 43 extending through an opening 44 formed in the plate 34, the rivet being secured to the body portion by split or bifurcated ends 45 formed on the shank 43 which are embedded in the body portion. The plate 38 and head 39 of the rivet are preferably casehardened for a purpose hereinafter described.
The fixed plate 34 has a fiat portion 47 formed in its circular side wall, and the movable plate 38 has a corresponding flat portion 46 formed in its side wall. These fiat portions are provided in order that the plug may be inserted into or removed from the socket, a special socket wrench designated at (Figs. 10 and 11) being provided for this purpose.
When applying or removing the improved plug the fiat portions 46 and 47 are brought into register so that the wrench 50 may engage the fixed plate 34, the plug may then be firmly screwed into the sleeve. After removing the wrench from the plug, the plate 38 is free to turn upon the shank of the rivet. Hence should an attempt be made to remove the plug with a sharp tool, such as a chisel or the like, the plate 38 will merely rotate without having any effect whatever upon removthe plug from the socket with tools other than the wrench.
The body portion is provided with a recess 52 to accommodate the center contact when the plug is screwed into the sleeve, it being understood, however, that the body portion may be formed of conductive material and arranged to engage said contact when it is desired to form a circuit or make solid through the plug.
Referring to Figs. 6 and '7, a slightly modified form of plug is shown, the construction being exactly the same as above described except that the rivet designated at 54 has a shank 55 extending through aligned openings formed in the plate 38 and body portion, and is held in place by a head 56 engaging a washer disposed in the recess 52.
The plug illustrated in Figs. 8 and 9 is substantially the same construction as shown in Figs. 1 to '7 inclusive, except that a pin 58 is Welded or otherwise secured to the plate 38 as indicated at 59, a head 60 being formed thereon which serves to hold the parts in assembled relation.
I claim:
1. A plug comprising an annular body portion formed of insulating material, a plate secured to said body portion, a second plate rotatably mounted on said first plate, and means for connecting said second plate to said body portion, whereby said second plate may rotate upon said first plate, said first and second plates having surfaces formed thereon adapted to be engaged by a socket wrench for insertion of the plug into a socket of the character described.
2. A plug comprising a body portion formed of insulating material and externally screw threaded, a plate secured to said body portion, a second plate mounted on said first plate, a rivet, said rivet having a head engaging an opening formed in said second plate, a shank extending through an opening in said first plate, and projections formed on the shank of said rivet embedded in said body portion holding said second plate in rotatable engagement with said first plate.
3. A plug comprising an annular body formed of insulating material and externally screw threaded, a metal plate mounted on said body portion and secured thereto by portions of said body portion extending into apertures formed in said plate, a second metal plate mounted on said first plate, and a member rotatably connecting said second plate to said body portion, said first and second plates having fiat portions formed in their circular side walls adapted to be engaged. by a wrench for insertion of the plug into a socket.
4. In combination with an electric socket including a screw threaded sleeve, of a plug threaded therein, said plug having a plate secured thereinto, and a second plate rotatably mounted on said first plate, said first and second plates having surfaces formed thereon for engagement with a wrench when inserting or removing the plug from the socket.
5. In combination with an electric screw threaded socket, of a plug threaded therein having a circular head provided with a mutilated periphery, and a circular metal plate having a mutilated periphery corresponding to the mutilated periphery of the head rotatably secured to said plug head, said head and plate adapted to be engaged with a wrench when inserting or removing the plug from the socket.
6. A locking plug for electric sockets and the like comprising a cylindrical body portion having a circular head of less diameter than the body portion, the periph ry of said head being mutilated, and a circular metal plate of substantially diameter as the head portion rotatably secured thereto, said plate having a mutilated periphery similar to the periphery of the head of the body portion.
7. A locking plug for fuse sockets and the like comprising an externally threaded body portion having a circular head of less diameter than the body portion, the periphery of said head being mutilated, a circular metal plate of substantially the same diameter as the head rotatably secured to said head, the periphery of said plate being mutilated similar to the head of the body portion, and means for temporarily holding the metal plate in locked engagement with the head of the body portion during the insertion of the locking plug into the socket.
FREDERICK E. REINHOLD.
US489915A 1930-10-20 1930-10-20 Locking plug for electric circuits Expired - Lifetime US1955146A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950457A (en) * 1955-05-12 1960-08-23 Saul I Slater Electrical outlet device
US20140220802A1 (en) * 2013-02-02 2014-08-07 Dte Electric Company Lockout and tagging device and assembly for a switchable energy isolation device such as a terminal block

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950457A (en) * 1955-05-12 1960-08-23 Saul I Slater Electrical outlet device
US20140220802A1 (en) * 2013-02-02 2014-08-07 Dte Electric Company Lockout and tagging device and assembly for a switchable energy isolation device such as a terminal block
US9059533B2 (en) * 2013-02-02 2015-06-16 Dte Electric Company Lockout and tagging device and assembly for a switchable energy isolation device such as a terminal block

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