DE8214460U1 - power outlet - Google Patents

Description

1261 / RO / p - 1 - May 17, 1982

description

The invention relates to a socket according to the preamble of claim 1. Such sockets are in particular at. Extension cables for electrical devices also in the form used by multiple sockets.

A large number of display items are often found in stores for electrical equipment such as power drills, small kitchen appliances, etc. Connected ready for use using sockets or multiple sockets. In the specialist trade these days It is not necessary to provide intensive professional advice to customers and, given the large number of devices on display possible to constantly and adequately monitor all exhibited devices. Thefts therefore occur again and again expensive devices that are simply unplugged and taken with you. Having an insurance against such theft If this is not possible, the only protection against such losses is the installation of alarm systems.

The present invention aims to create a socket which provides a signal that can be used for alarm purposes, when a plug inserted into it is removed.

According to the invention, this object is achieved by a socket according to claim 1.

Sockets according to the invention are used in particular to connect devices to be monitored to the electrical network.

For this reason, for security reasons, it is usually impossible for a thief to cut the power cord himself; rather, he has to pull the plug out of the socket in order to move a device away. Using sockets according to the invention, an alarm signal is immediately given in the event of such an attempt, since it is pulled out

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1261 / RO / p -2- May 17, 1982?)

of the power plug automatically in a mechanical manner to the in. _; the socket integrated microswitch is switched, preferably opened. By actuating the microswitch, a continuous visual and / or acoustic alarm is generated in a monitoring unit connected to the socket.

The invention can easily be used with conventional standard sockets realize, since only the microswitch and the 'additional

associated actuator need to be installed. Since the sockets for the contact pins of a power plug are a have a large clamping force, the spring-loaded microswitch and the associated switch actuating element is safely in the working position that does not trigger an alarm when the plug is inserted held.

Advantageous further developments of the invention are set out in the subclaims specified.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the accompanying drawings. In this show:

Figure 1: a transverse section through a multiple socket along the line II-II of Figure 2;

FIG. 2: a plan view of part of the multiple socket according to FIG. 1;

FIG. 3: a transverse section through a modified multiple socket similar to FIG. 1; ' _ä

i Figure 4: a transverse section through a further section

converted multiple socket; Ψ

1261 / RO / p - 3 - May 17, 1982

FIG. 5: a schematic block diagram of a using a socket according to one of the figures 1 to 4 constructed monitoring system; and

FIG. 6: a circuit diagram of a modified switch unit for use in the monitoring unit according to FIG 5.

Figure 1 shows a transverse section through a multiple socket For European standard flat connectors with a housing molded from electrically insulating plastic 10.

In the upper side of the housing 10 there is a plurality of receptacles 12 lying one behind the other for a body of a flat plug intended. The recordings 12 are about in the bottom 14 of the Passages 16, 18 provided for reception with a lower housing chamber 20 in connection, which through a cover 22 is locked.

The cover 22 carries an insulating body 24, and on this two parallel busbars 26, 28 are defined, each of which is provided with resilient socket sections 30, 32. The busbars 26, 28 are electrically connected to a supply cable 34.

In the bottom 14 of each of the receptacles 12 is also a The plunger 36 is guided displaceably perpendicular to the bottom surface. The plungers 36 work on aligned switch pins 38 associated microswitch 40. The microswitches 40 are connected in series and can via a socket 42 and a connecting cable not shown in detail can be connected to a central monitoring unit.

It can be seen that when a plug is inserted into one of the receptacles 12, the plunger 36 is automatically pressed downward

1261 / RO / p - 4 - May 17, 1982

is, whereby the microswitch 40 is closed. The operation of the microswitch 40 can expediently take place via an interposed leaf spring on which the The plunger 36 acts at a greater distance from the clamping point than the switching pin 38. In this way, the The plunger 36 continues to move a little * after the switching pin 38 has been moved into the retracted working position. When a plug is removed, the plunger 36 is released again, so that the switching pin 38 is under its spring preload can move back into the extended rest position.

In the multiple socket according to Figure 3, the parts are above have already been described, again provided with the same reference numerals. The microswitch 40 is now, however provided with a long switch pin 38 'made of electrically insulating material, which is located directly in the track a contact pin of a plug to be inserted is arranged.

In the multiple socket according to Figure 4, the microswitch 40 is arranged to the side of the insulating body 24 and is through a slide 44 is actuated which has a ramp surface 46 with which it is in the path of one through the socket sections 30, 32 protruding plug pin moved through.

The sockets according to Figures 3 and 4 show to the outside in no way that they are provided with an anti-theft device are. Unauthorized actuation of microswitches 40 is practically impossible, since such an actuation would only be possible through the live parts of the socket.

Figure 5 shows the various microswitches of a multiple socket, each of the microswitches 40 being designed as a switch with a normally open contact and a normally closed contact

1261 / RO / p - 5 - May 17, 1982

is. A spring 48 is used to bias the switching bridge 50 into the upper working position. Dia output contacts of each the microswitches 40 are interconnected by a bridge 52, and the output of each switch unit 54 is connected to the input of a subsequent switch unit, as can be seen from the drawing. The first switch unit is connected to a DC voltage supply of a central monitoring unit via a conductor 56, while the last of the switch units 54 is connected to the set input of a bistable flip-flop 60 via a conductor 58 connected to the monitoring unit. Their "1" output is connected to the control input of an alarm unit 62. A reset terminal is used to switch off the alarm unit 62 switch 64 connected to flip-flop 60.

In the case of the monitoring unit according to FIG. 5, not all of the plug receptacles 12 are required with a plug or a plug Blank plug must be occupied so that the monitoring unit does not trigger an alarm. An alarm is only triggered when the current through the switch units 54 connected in series is briefly interrupted.

In order to now additionally ensure that in an unoccupied plug receptacle of the multiple socket an additional Plug can be used without triggering an alarm, you can switch units as in Figure 6 reproduced further education. An output-side OR gate 66 has an input directly with that contact of the Microswitch connected, against which the switching bridge 50 is pressed when the plug is inserted. The other contact of the microswitch, which is connected to the input of the switch unit by the switching bridge 50 in the unloaded state is connected is on the one hand directly connected to a second input of the OR gate 66 and on the other hand via one Inverter 68, a differentiator 70 and a diode 72

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1261 / RO / p - 6 - May 17, 1982

connected to a monostable flip-flop 74. Its output is connected to a third input of the OR gate 66 tied together.

If the switching bridge |

50 moved out of the shown state, %

the signal at the middle input of the OR gate 66 away, Ψ

but at the same time the output signal of the multivibrator ':>,

74 received so that the signal at the output of the OR gate f

66 is retained. If the switching bridge 50 is now quickly in |

moves its lower working position, as it does when plugging in p

a plug into the socket is easily possible, |

so the lowest input of the OR gate 66 with the signal:, applied before the flip-flop 74 terminates its signal.

One thus has a permanently pending output at the output of the OR element 66 Signal.

If, on the other hand, the switching bridge 50 is moved away from the lower contact of the microswitch, one receives one at the same time Voltage drop at the output of the OR gate 66 and thus

triggering an alarm. ,, ■■

Claims (4)

1261 / RO / p - 1 - May 17, 1982 claims for protection 1. Socket with a housing, which with at least one Plug body receptacle and with the plug body receptacles associated contact pin receptacles is formed, and carried by the housing sockets for contact pins a connector for the various connector body receptacles, characterized by a microswitch (40) working switch actuating member (36; 44) which is movably supported by the housing (10) and which is inserted into the plug receptacle (12) or protrudes into one of the pin receptacles. 2. Socket according to claim 1, characterized in that the switch actuating member (36) is displaceable in the plugging direction in the bottom wall (14) of the plug receptacle (12) ge · ^ leads is. 3. Socket according to claim 1, characterized in that the switch actuating member (36) can be displaced in the plugging direction protrudes into one of the pin receptacles. 4. Socket according to claim 1, characterized in that the Switch actuating member (44) protrudes perpendicular to the plugging direction into one of the pin receptacles and with it a ramp surface (46) is provided.