CA2251697A1 - Extracting device for plug - Google Patents
Extracting device for plug Download PDFInfo
- Publication number
- CA2251697A1 CA2251697A1 CA002251697A CA2251697A CA2251697A1 CA 2251697 A1 CA2251697 A1 CA 2251697A1 CA 002251697 A CA002251697 A CA 002251697A CA 2251697 A CA2251697 A CA 2251697A CA 2251697 A1 CA2251697 A1 CA 2251697A1
- Authority
- CA
- Canada
- Prior art keywords
- plug
- piston
- socket
- coil
- ejector body
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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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
- H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
- H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
- H01R13/633—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for disengagement only
- H01R13/635—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for disengagement only by mechanical pressure, e.g. spring force
-
- 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
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
- H01R13/7132—Structural association with built-in electrical component with built-in switch the switch being a safety switch having ejecting mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2103/00—Two poles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
- H01R24/28—Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable
Abstract
Extracting device for a plug (10) at the end of an electric cable connected to an electric appliance, which plug (10) may be plugged into a socket (16). The extracting device comprises at least one elongate, alternatingly displaceable piston (14) which has a longitudinal piston-portion located within the plug (10), which longitudinal portion and the plug (10) have a common longitudinal axis. The piston (14) has two main positions, a first main position in which the front end (14') of the piston (14) is withdrawn in relation to the outer ends of the projecting contact pins (18, 18') of the plug (10), and a second main portion, in which said front end (14') thereof is located substantially just as far in front of the front end surface of the plug (10) as the outer ends of said contact pins (18, 18'). The piston (14) has an activating device (24, 28, 26, 26') arranged thereto, which, itself, is arranged to be activated automatically and maybe by remote control, to activate, thereby, the piston (14) to effect a displacement of this from said first main position into said second main position. During said displacement the piston (14) exerts a pressure against the socket (16), so that the contact pins (18, 18') of the plug (10) are extracted from the corresponding bores (20, 20') of the socket (16).
Description
CA 022~1697 1998-10-14 W O 97/39497 PCTnN097/00094 EXTRACTING DEVICE FOR PLUG
This invention relates to an extracting device for a plug which may be plugged into a socket, and which is carried by an electric appliance, machine or similar 5 devices, such as electric engine heaters in motor vehicles, battery chargers for electric vehicles and the like.
If one forgets to extract a plug which has been plugged into a socket, for example by the use of an engine heater, this may lead to a powerful jerk being applied to the electric cable holding the plug. Thus the plug, cable and/or socket may be damaged.
In NO patent No. 165 088 a device is disclosed, which is arranged to effect an automatic withdrawing of a plug being part of an electric heating device for motor vehicles. The withdrawing device of this heating device is very bulky, meant to be mounted in a garage, and arranged to pull the coupling up to a position at a higher level, out of the reach of children. For this purpose the known device has a weight-loaded, upward sloping, pull-biased wire for moving said electrically CA 022~1697 1998-10-14 W O 97/39497 PCT~N097/00094 established coupling up to the top of a column, where the coupling no longer represents a hazard.
A wire connected to the plug is subjected to an upward sloping pull to said higher coupling parking level, by means of a weight attached to the other end of the wire, and the wire is placed over a pulley at the top of the column. The device requires a column of a certain minimum height, which provides a plug-pulling device too bulky for diverse application.
lo The object of the present invention was to eliminate or substantially alleviate the imperfections, drawbacks and restrictions on application of the state of the art, as represented by the above NO patent.
The aim has essentially been achieved by means of an automatic, remotely controlled, plug-extracting device of the initially mentioned kind, having the features stated in the characterizing part of claim 1.
Advantageous subordinate features, describing preferred embodiments, have been made the objects of subsequent, dependent, subordinate claims.
In a plug-extracting device according to the invention is included at least one central, axially directed piston in the plug, which piston has two main positions along the longitudinal axis of the piston, namely a first, withdrawn, idle position, in which the front attacking end of the piston towards the fixed socket does not apply any push force when the contact pins of the plug are fully engaged in the insertion holes of the socket with the aim of intentionally establishing an electric connection between a plug at the end of an electric cable belonging to an electric appliance etc.
and the socket fixed to the wall, or the loose CA 022~1697 1998-10-14 W O 97/39497 PCT~N097/00094 extension socket; and a working position, displaced axially forwards, in which the piston through its attacking end exerts such a considerable push force against the adjacent, outward central portion of the 5 socket that the contact pins of the plug are not able to resist the push force, but are extracted from the socket.
The piston has an idle position and an activated state.
The piston may be activated directly or indirectly. In one embodiment in which the object of the invention is used in an engine heater in a motor vehicle, around the piston, which consists of ferro-magnetic metal and forms a core, is wound an electric line wire for the formation of a concentric induction coil with a wire connection to earth and to the starting motor of the vehicle. In the established electric circuit may be connected a condenser arranged to accelerate the coil.
When the starting motor is activated on starting the car motor, the coil about the piston receives elec-tricity from the storage battery of the vehicle. Onactivation, i.e. when the coil is made current carrying, the piston is subjected to a powerful axially directed displacement in the direction of the socket, whereby the plug is forced out.
In another embodiment the piston is not influenced directly by the current in the coil, but indirectly, as a compression spring retains the piston in an idle stand-by position, in which the spring is kept in an idle, tensioned state by means of a transverse, elongate blocking or locking device, preferably of ferro-magnetic metal, about which is wound a corresponding line wire for the formation of a coil of the same kind as the coil around the piston according to the first embodiment. The blocking or locking means of this embodiment is spring-biased towards the CA 022~1697 1998-10-14 blocking position. In this embodiment the piston may consist of any suitable material.
The second embodiment is primarily meant to be connected to portable electrically driven appliances and tools, such as vacuum cleaners, electric lawn mowers, electric hand-held tools and similar.
Such electric appliances and tools are usually plugged, by a plug at the end of a cable, into a socket in a wall, or into a socket-shaped connecting part at the end of an extension cord. When the work is finished, the user must walk to the end of, for example, the cable of the vacuum cleaner and pull the plug out.
When, for example, the plug of the cable of the vacuum cleaner is plugged into said socket, the piston is displaced against the force of the spring in a direction away from the socket, while the spring is being axially compressed. The compression spring, in the form of a helical spring, is positioned in a concentric sleeve which has a bottom at its end nearest to the socket. In the opposite end of the plug is a retaining/abutment means for the adjacent end of the compression spring, and in which retaining/abutment means is formed a guiding hole for the piston. Said blocking or locking means will, when the piston is withdrawn and the compression spring is tensioned between said sleeve bottom and retaining or abutment means, under the influence of the spring adopt a pushed-out, effective blocking position, in which the blocking or locking means with its outer end portion engages behind the bottom of the sleeve, thus preventing the compression spring of the piston from expanding.
.... . . . . ..
CA 022~1697 1998-10-14 W097/39497 PCT~097/00094 In the second embodiment the blocking/locking means consists of ferro-magnetic material, and its coil has a line connection to the current carrying cables through a signal decoder. The signal decoder/receiver picks up current to the coil, and is arranged to receive a signal, which is to make it respond and axially withdraw the blocking/locking means for the release of the sleeve surrounding the compression spring, which thereby presses the piston forwards towards the socket, whereby the same course of events as by the first embodiment is repeated.
The signal to the signal decoder/receiver comes from a transmitter which may be attached to the electric appliance or tool, to which the plug belongs, for example a vacuum cleaner or an electric saw.
Practically, it is conceivable, in the second embodiment, that when the user of a vacuum cleaner operates a button which activates a reel for retracting and winding the cable of the vacuum cleaner, an output signal is simultaneously given from a signal transmitter in the vacuum cleaner to the signal decoder/signal receiver in the plug, to activate the blocking/locking means in order to release the piston and effect the forcing out of the contact pins of the plug from the socket.
The invention will be explained in detail in the following, with reference to the exemplary embodiments illustrated in the accompanying drawings. Reference is made to the drawings, in which Figs. 1 and 2 show, in axial section, a first embodiment;
CA 022~1697 1998-10-14 W O97139497 ' PCT~N097/00094 Fig. 1 showing a plug-extracting device comprising a rod-shaped piston centrically arranged in a plug, which by its contact pins is positioned for immediate plugging into a socket, which may be fixed to the wall, or be at the end of an extension cord;
Fig. 2, corresponding to fig. 1, but showing the plug plugged into the socket, whereby the centric piston of the plug has been pushed axially backwards to an idle stand-by position;
Figs. 3 and 4 show, in axial section, a second embodiment;
Fig. 3 showing the plug in the position for immediate plugging into a socket, corresponding to fig. l;
Fig. 4 showing the plug in its plugged-in position, corresponding to fig. 2;
Fig. 5 shows, in axial section, a plug-extracting device according to a third embodiment, the plug being in the extracted position;
Figs. 6 and 7 show, in axial section, a plug-extracting device according to a fourth embodiment;
Fig. 6 showing the plug positioned for immediate plugging into a socket, corresponding to fig. l;
Fig. 7 showing the plug in the plugged-in position, corresponding to fig. 2.
CA 022~1697 1998-10-14 W O 97/39497 ' PCTAN097/00094 Referring first to figs. 1 and 2; a plug 10 has axially flush guiding holes 12, 12' in its opposite end walls 10', 10'' for a centrically arranged, linearly formed rod-piston 14 with an outer attacking head 14', which in the withdrawn, idle stand-by position of the piston 14, fig. 2, may have been retracted into a recess in the end wall surface 10'' of the socket 10, nearest to the socket 16. In fig. 2, conventional contact pins 18, 18' of the plug 10 are plugged into corresponding bores 20, 20' having inner contact sleeves 22, 22', in which the friction between the pins 18, 18' and the walls of the bores ensures the engagement as long as the piston 14 is not activated, fig. 2.
An embodiment of the plug-extracting device as shown in figs. 1 and 2, may, for example, be used in engine heaters in private cars and lorries, buses and when charging storage batteries for electric cars, wheel chairs etc.
In the embodiment according to figs. 1 and 2 the centric piston 14 has got a wound-on line wire for the formation of an induction coil 24, as the piston consists of ferro-magnetic metal. The coil 24 is, through two electric wires 26, 26', via a condenser 28 which is arranged to enable acceleration of the coil 24, but which may optionally be omitted, connected to earth and to the starting motor (not shown) of the motor vehicle.
When the plug 10 is left, unintentionally, in its plugged-in position in the socket, in accordance with fig. 2, and starting of the motor vehicle through the starting motor is initiated, the latter will supply power to the coil 24, which has a direction of windings which thereby causes an axial displacement of the CA 022~1697 1998-10-14 W097/39497 PCT~097/00094 ferro-magnetic core/piston 14 in the direction towards the socket 16. Thus, the device is arranged so, that the piston 14 exerts an axial push force against the socket 16 greater than the longitudinal component of force of the frictional force between the contact pins of the plug lO and the complementary bores of the socket 16. Thereby the plug is pushed out of the socket until the two are fully separated, fig. 1. When the motor of the motor vehicle starts, the current to the starting motor is interrupted and the coil 24 is dead.
A second embodiment is shown in figs. 3 and 4, in which parts corresponding or functionally equivalent to parts according to figs. 1 and 2 are designated by the same reference numerals.
Thus, the plug 10 according to figs. 3 and 4 has a piston 14 arranged thereto, which piston 14 has an attacking head 14' and is guided by a hole 12' in the front end wall 10'' of the plug 10 and by a hole 12 in the rear end wall lO'. The socket 16 has, thereby, a configuration which is almost identical to that shown in figs. 1 and 2. The contact pins 18, 18' and their by friction determined engagement and retention in the bores 20, 20' of the socket 16, are exactly as in the embodiment according to figs. 1 and 2, and will consequently not be described in detail.
The piston 14 has not a coil of its own arranged thereto, but is, on the other hand, provided with a compression spring in the form of a helical spring 30, which is surrounded, in its compressed state, fig. 4, by a sleeve 32, having an end wall 32', which is fixed to the piston 14. The sleeve 32, 32' will enclose a part of the length of the compression spring 30 when this is ex~nded, fig. 3. The compression spring 30 is CA 022~1697 1998-10-14 W 097139497 ' PCTAN097100094 suspended between the front surface of the end wall 10' and the sleeve bottom which is formed by the rear surface of the end wall 32' of the sleeve. The task of the compression spring 30 is to expand from the compressed state in fig. 4 to the state according to fig. 3, thereby pushing the plug 10 out of the socket 16 in the same way as described in connection w$th the embodiment in figs. 1 and 2.
Before such a plug-extraction is to be actuated automatically and by remote control, the compression spring 30 must be kept in its compressed state, fig. 4.
This is done by means of a spring-loaded (34) blocking means 36 extending and being displaceable in one direction transverse to the longitudinal axis of the ~5 piston 14 and the spring 30. In the withdrawn, spring-loaded, stand-by position of the extraction piston 14 and the corresponding position of the compression spring 30, fig. 4, the compression spring 34 of the blocking means 36 has moved its outer blocking end portion 36' in behind the sleeve bottom constituted by the end wall 32' of the sleeve 32. Thereby the expansion of the spring 30 is prevented and the piston 14 is retained in its withdrawn, idle position.
In this embodiment it is the blocking means 36 of preferably ferro-magnetic material which is surrounded by a coil 38 of line wire, that has a signal decoder/receiver 28 arranged thereto, and through which it is connected to the current carrying conductors 50, 50' of the electric cable.
The embodiment according to figs. 3 and 4 may be used with portable appliances and tools, such as vacuum cleaners, electric lawn mowers and similar electric tools.
CA 022~1697 1998-10-14 WO 97/39497 PC~T/N097/00094 The signal decoder/receiver 28 picks up current to the coil 38 and is arranged to receive a signal making it respond. The signal comes from a transmitter (not shown) which may be attached to, for example, a vacuum 5 cleaner. It is known within the art to use the current carrying conductors 50, 50' as such signal carriers.
By a vacuum cleaner it is conceivable, practically, that when the user operates a button activating a reel for winding the cable of the vacuum cleaner, a signal 10 is sent by said transmitter through the conductors 50, 50' and 26, 26' to a signal decoder/signal receiver 28 arranged to the plug lO. The signal decoder 28 is thus arranged to pull by the reel 38 the blocking means 36 against the spring 34. Thereby the sleeve 32 is 15 released and the spring 30 presses the piston 14 through the sleeve 32, 32' in towards the socket 16, whereafter the push-out procedure of the plug 10 follows exactly as previously explained. Reference numeral 40 designates a housing enclosing the signal 20 decoder/receiver 28 and the blocking means 36.
Fig. 5 shows a modification of the embodiment according to figs. 1 and 2, and essentially shows another positioning of the piston's 14a' rear portion, surrounded by the coil, as it is connected to the 25 piston 14 through a flexible rod 14a. The flexible rod 14a and the conductors 50, 50', 26, 26' may be positioned together with the flexible rod 14a within a protective tube 51.
A somewhat elongate hollow body 42 has two end walls 30 transverse to the longitudinal axis of the adjacent piston portion 14a', which end walls have one guiding hole each for said piston portion 14a'.
CA 022~1697 1998-10-14 W O 97/39497 PCT~N097/0009411 The embodiment according to fig. 5 leaves more freedom of choice as to placing the coil/condenser 24, 28, which does not have to be placed at the plug 10 itself.
The embodiment according to fig. 5 works in the same way as the embodiment according to figs. 1 and 2, and the way of working will not be explained again.
Figs. 6 and 7 show a further embodiment which essentially corresponds to the embodiment of figs. 3 and 4, and identical parts in these figures are lo designated by the same reference numerals. The embodiment in figs. 6 and 7 differs from the other embodiments by having, instead of a central rod-like piston 14, 14a, an alternatingly moveable, spring-loaded tube 14B with a central longitudinal axis. The tube-shaped piston 14B has a graded portion 14B' of larger diameter tboth internally and externally), but in the example smaller wall-thickness than the remaining part of the tubular piston 14B. Thereby is formed a radially directed, annular abutment surface 14B'', which one end of the compression spring 30A
bears against. The second end of the spring 30A bears supportingly against an end surface 52' in an annular space 52, formed in the plug 10, for the spring 30A.
In the plugged-in position of the plug 10 in the socket 16, the blocking means 36 bears with its blocking end against an annular radial surface 14B''', so that the compression spring 30A is kept in compressed stand-by position as shown in fig. 7. As in the embodiment in figs. 3 and 4, the blocking means 36 consists of ferro-magnetic material and is surrounded by a coil 38 ofline wire, which has a signal decoder/receiver 28 arranged thereto, and which communicates through the latter with the current carrying conductors 50, 50' in CA 0225l697 l998-l0-l4 W O 97/39497 PCT~N097/00094 12 the electric cable. For the rest, this further embodiment is configured as previously described in connection with figs. 3 and 4.
This invention relates to an extracting device for a plug which may be plugged into a socket, and which is carried by an electric appliance, machine or similar 5 devices, such as electric engine heaters in motor vehicles, battery chargers for electric vehicles and the like.
If one forgets to extract a plug which has been plugged into a socket, for example by the use of an engine heater, this may lead to a powerful jerk being applied to the electric cable holding the plug. Thus the plug, cable and/or socket may be damaged.
In NO patent No. 165 088 a device is disclosed, which is arranged to effect an automatic withdrawing of a plug being part of an electric heating device for motor vehicles. The withdrawing device of this heating device is very bulky, meant to be mounted in a garage, and arranged to pull the coupling up to a position at a higher level, out of the reach of children. For this purpose the known device has a weight-loaded, upward sloping, pull-biased wire for moving said electrically CA 022~1697 1998-10-14 W O 97/39497 PCT~N097/00094 established coupling up to the top of a column, where the coupling no longer represents a hazard.
A wire connected to the plug is subjected to an upward sloping pull to said higher coupling parking level, by means of a weight attached to the other end of the wire, and the wire is placed over a pulley at the top of the column. The device requires a column of a certain minimum height, which provides a plug-pulling device too bulky for diverse application.
lo The object of the present invention was to eliminate or substantially alleviate the imperfections, drawbacks and restrictions on application of the state of the art, as represented by the above NO patent.
The aim has essentially been achieved by means of an automatic, remotely controlled, plug-extracting device of the initially mentioned kind, having the features stated in the characterizing part of claim 1.
Advantageous subordinate features, describing preferred embodiments, have been made the objects of subsequent, dependent, subordinate claims.
In a plug-extracting device according to the invention is included at least one central, axially directed piston in the plug, which piston has two main positions along the longitudinal axis of the piston, namely a first, withdrawn, idle position, in which the front attacking end of the piston towards the fixed socket does not apply any push force when the contact pins of the plug are fully engaged in the insertion holes of the socket with the aim of intentionally establishing an electric connection between a plug at the end of an electric cable belonging to an electric appliance etc.
and the socket fixed to the wall, or the loose CA 022~1697 1998-10-14 W O 97/39497 PCT~N097/00094 extension socket; and a working position, displaced axially forwards, in which the piston through its attacking end exerts such a considerable push force against the adjacent, outward central portion of the 5 socket that the contact pins of the plug are not able to resist the push force, but are extracted from the socket.
The piston has an idle position and an activated state.
The piston may be activated directly or indirectly. In one embodiment in which the object of the invention is used in an engine heater in a motor vehicle, around the piston, which consists of ferro-magnetic metal and forms a core, is wound an electric line wire for the formation of a concentric induction coil with a wire connection to earth and to the starting motor of the vehicle. In the established electric circuit may be connected a condenser arranged to accelerate the coil.
When the starting motor is activated on starting the car motor, the coil about the piston receives elec-tricity from the storage battery of the vehicle. Onactivation, i.e. when the coil is made current carrying, the piston is subjected to a powerful axially directed displacement in the direction of the socket, whereby the plug is forced out.
In another embodiment the piston is not influenced directly by the current in the coil, but indirectly, as a compression spring retains the piston in an idle stand-by position, in which the spring is kept in an idle, tensioned state by means of a transverse, elongate blocking or locking device, preferably of ferro-magnetic metal, about which is wound a corresponding line wire for the formation of a coil of the same kind as the coil around the piston according to the first embodiment. The blocking or locking means of this embodiment is spring-biased towards the CA 022~1697 1998-10-14 blocking position. In this embodiment the piston may consist of any suitable material.
The second embodiment is primarily meant to be connected to portable electrically driven appliances and tools, such as vacuum cleaners, electric lawn mowers, electric hand-held tools and similar.
Such electric appliances and tools are usually plugged, by a plug at the end of a cable, into a socket in a wall, or into a socket-shaped connecting part at the end of an extension cord. When the work is finished, the user must walk to the end of, for example, the cable of the vacuum cleaner and pull the plug out.
When, for example, the plug of the cable of the vacuum cleaner is plugged into said socket, the piston is displaced against the force of the spring in a direction away from the socket, while the spring is being axially compressed. The compression spring, in the form of a helical spring, is positioned in a concentric sleeve which has a bottom at its end nearest to the socket. In the opposite end of the plug is a retaining/abutment means for the adjacent end of the compression spring, and in which retaining/abutment means is formed a guiding hole for the piston. Said blocking or locking means will, when the piston is withdrawn and the compression spring is tensioned between said sleeve bottom and retaining or abutment means, under the influence of the spring adopt a pushed-out, effective blocking position, in which the blocking or locking means with its outer end portion engages behind the bottom of the sleeve, thus preventing the compression spring of the piston from expanding.
.... . . . . ..
CA 022~1697 1998-10-14 W097/39497 PCT~097/00094 In the second embodiment the blocking/locking means consists of ferro-magnetic material, and its coil has a line connection to the current carrying cables through a signal decoder. The signal decoder/receiver picks up current to the coil, and is arranged to receive a signal, which is to make it respond and axially withdraw the blocking/locking means for the release of the sleeve surrounding the compression spring, which thereby presses the piston forwards towards the socket, whereby the same course of events as by the first embodiment is repeated.
The signal to the signal decoder/receiver comes from a transmitter which may be attached to the electric appliance or tool, to which the plug belongs, for example a vacuum cleaner or an electric saw.
Practically, it is conceivable, in the second embodiment, that when the user of a vacuum cleaner operates a button which activates a reel for retracting and winding the cable of the vacuum cleaner, an output signal is simultaneously given from a signal transmitter in the vacuum cleaner to the signal decoder/signal receiver in the plug, to activate the blocking/locking means in order to release the piston and effect the forcing out of the contact pins of the plug from the socket.
The invention will be explained in detail in the following, with reference to the exemplary embodiments illustrated in the accompanying drawings. Reference is made to the drawings, in which Figs. 1 and 2 show, in axial section, a first embodiment;
CA 022~1697 1998-10-14 W O97139497 ' PCT~N097/00094 Fig. 1 showing a plug-extracting device comprising a rod-shaped piston centrically arranged in a plug, which by its contact pins is positioned for immediate plugging into a socket, which may be fixed to the wall, or be at the end of an extension cord;
Fig. 2, corresponding to fig. 1, but showing the plug plugged into the socket, whereby the centric piston of the plug has been pushed axially backwards to an idle stand-by position;
Figs. 3 and 4 show, in axial section, a second embodiment;
Fig. 3 showing the plug in the position for immediate plugging into a socket, corresponding to fig. l;
Fig. 4 showing the plug in its plugged-in position, corresponding to fig. 2;
Fig. 5 shows, in axial section, a plug-extracting device according to a third embodiment, the plug being in the extracted position;
Figs. 6 and 7 show, in axial section, a plug-extracting device according to a fourth embodiment;
Fig. 6 showing the plug positioned for immediate plugging into a socket, corresponding to fig. l;
Fig. 7 showing the plug in the plugged-in position, corresponding to fig. 2.
CA 022~1697 1998-10-14 W O 97/39497 ' PCTAN097/00094 Referring first to figs. 1 and 2; a plug 10 has axially flush guiding holes 12, 12' in its opposite end walls 10', 10'' for a centrically arranged, linearly formed rod-piston 14 with an outer attacking head 14', which in the withdrawn, idle stand-by position of the piston 14, fig. 2, may have been retracted into a recess in the end wall surface 10'' of the socket 10, nearest to the socket 16. In fig. 2, conventional contact pins 18, 18' of the plug 10 are plugged into corresponding bores 20, 20' having inner contact sleeves 22, 22', in which the friction between the pins 18, 18' and the walls of the bores ensures the engagement as long as the piston 14 is not activated, fig. 2.
An embodiment of the plug-extracting device as shown in figs. 1 and 2, may, for example, be used in engine heaters in private cars and lorries, buses and when charging storage batteries for electric cars, wheel chairs etc.
In the embodiment according to figs. 1 and 2 the centric piston 14 has got a wound-on line wire for the formation of an induction coil 24, as the piston consists of ferro-magnetic metal. The coil 24 is, through two electric wires 26, 26', via a condenser 28 which is arranged to enable acceleration of the coil 24, but which may optionally be omitted, connected to earth and to the starting motor (not shown) of the motor vehicle.
When the plug 10 is left, unintentionally, in its plugged-in position in the socket, in accordance with fig. 2, and starting of the motor vehicle through the starting motor is initiated, the latter will supply power to the coil 24, which has a direction of windings which thereby causes an axial displacement of the CA 022~1697 1998-10-14 W097/39497 PCT~097/00094 ferro-magnetic core/piston 14 in the direction towards the socket 16. Thus, the device is arranged so, that the piston 14 exerts an axial push force against the socket 16 greater than the longitudinal component of force of the frictional force between the contact pins of the plug lO and the complementary bores of the socket 16. Thereby the plug is pushed out of the socket until the two are fully separated, fig. 1. When the motor of the motor vehicle starts, the current to the starting motor is interrupted and the coil 24 is dead.
A second embodiment is shown in figs. 3 and 4, in which parts corresponding or functionally equivalent to parts according to figs. 1 and 2 are designated by the same reference numerals.
Thus, the plug 10 according to figs. 3 and 4 has a piston 14 arranged thereto, which piston 14 has an attacking head 14' and is guided by a hole 12' in the front end wall 10'' of the plug 10 and by a hole 12 in the rear end wall lO'. The socket 16 has, thereby, a configuration which is almost identical to that shown in figs. 1 and 2. The contact pins 18, 18' and their by friction determined engagement and retention in the bores 20, 20' of the socket 16, are exactly as in the embodiment according to figs. 1 and 2, and will consequently not be described in detail.
The piston 14 has not a coil of its own arranged thereto, but is, on the other hand, provided with a compression spring in the form of a helical spring 30, which is surrounded, in its compressed state, fig. 4, by a sleeve 32, having an end wall 32', which is fixed to the piston 14. The sleeve 32, 32' will enclose a part of the length of the compression spring 30 when this is ex~nded, fig. 3. The compression spring 30 is CA 022~1697 1998-10-14 W 097139497 ' PCTAN097100094 suspended between the front surface of the end wall 10' and the sleeve bottom which is formed by the rear surface of the end wall 32' of the sleeve. The task of the compression spring 30 is to expand from the compressed state in fig. 4 to the state according to fig. 3, thereby pushing the plug 10 out of the socket 16 in the same way as described in connection w$th the embodiment in figs. 1 and 2.
Before such a plug-extraction is to be actuated automatically and by remote control, the compression spring 30 must be kept in its compressed state, fig. 4.
This is done by means of a spring-loaded (34) blocking means 36 extending and being displaceable in one direction transverse to the longitudinal axis of the ~5 piston 14 and the spring 30. In the withdrawn, spring-loaded, stand-by position of the extraction piston 14 and the corresponding position of the compression spring 30, fig. 4, the compression spring 34 of the blocking means 36 has moved its outer blocking end portion 36' in behind the sleeve bottom constituted by the end wall 32' of the sleeve 32. Thereby the expansion of the spring 30 is prevented and the piston 14 is retained in its withdrawn, idle position.
In this embodiment it is the blocking means 36 of preferably ferro-magnetic material which is surrounded by a coil 38 of line wire, that has a signal decoder/receiver 28 arranged thereto, and through which it is connected to the current carrying conductors 50, 50' of the electric cable.
The embodiment according to figs. 3 and 4 may be used with portable appliances and tools, such as vacuum cleaners, electric lawn mowers and similar electric tools.
CA 022~1697 1998-10-14 WO 97/39497 PC~T/N097/00094 The signal decoder/receiver 28 picks up current to the coil 38 and is arranged to receive a signal making it respond. The signal comes from a transmitter (not shown) which may be attached to, for example, a vacuum 5 cleaner. It is known within the art to use the current carrying conductors 50, 50' as such signal carriers.
By a vacuum cleaner it is conceivable, practically, that when the user operates a button activating a reel for winding the cable of the vacuum cleaner, a signal 10 is sent by said transmitter through the conductors 50, 50' and 26, 26' to a signal decoder/signal receiver 28 arranged to the plug lO. The signal decoder 28 is thus arranged to pull by the reel 38 the blocking means 36 against the spring 34. Thereby the sleeve 32 is 15 released and the spring 30 presses the piston 14 through the sleeve 32, 32' in towards the socket 16, whereafter the push-out procedure of the plug 10 follows exactly as previously explained. Reference numeral 40 designates a housing enclosing the signal 20 decoder/receiver 28 and the blocking means 36.
Fig. 5 shows a modification of the embodiment according to figs. 1 and 2, and essentially shows another positioning of the piston's 14a' rear portion, surrounded by the coil, as it is connected to the 25 piston 14 through a flexible rod 14a. The flexible rod 14a and the conductors 50, 50', 26, 26' may be positioned together with the flexible rod 14a within a protective tube 51.
A somewhat elongate hollow body 42 has two end walls 30 transverse to the longitudinal axis of the adjacent piston portion 14a', which end walls have one guiding hole each for said piston portion 14a'.
CA 022~1697 1998-10-14 W O 97/39497 PCT~N097/0009411 The embodiment according to fig. 5 leaves more freedom of choice as to placing the coil/condenser 24, 28, which does not have to be placed at the plug 10 itself.
The embodiment according to fig. 5 works in the same way as the embodiment according to figs. 1 and 2, and the way of working will not be explained again.
Figs. 6 and 7 show a further embodiment which essentially corresponds to the embodiment of figs. 3 and 4, and identical parts in these figures are lo designated by the same reference numerals. The embodiment in figs. 6 and 7 differs from the other embodiments by having, instead of a central rod-like piston 14, 14a, an alternatingly moveable, spring-loaded tube 14B with a central longitudinal axis. The tube-shaped piston 14B has a graded portion 14B' of larger diameter tboth internally and externally), but in the example smaller wall-thickness than the remaining part of the tubular piston 14B. Thereby is formed a radially directed, annular abutment surface 14B'', which one end of the compression spring 30A
bears against. The second end of the spring 30A bears supportingly against an end surface 52' in an annular space 52, formed in the plug 10, for the spring 30A.
In the plugged-in position of the plug 10 in the socket 16, the blocking means 36 bears with its blocking end against an annular radial surface 14B''', so that the compression spring 30A is kept in compressed stand-by position as shown in fig. 7. As in the embodiment in figs. 3 and 4, the blocking means 36 consists of ferro-magnetic material and is surrounded by a coil 38 ofline wire, which has a signal decoder/receiver 28 arranged thereto, and which communicates through the latter with the current carrying conductors 50, 50' in CA 0225l697 l998-l0-l4 W O 97/39497 PCT~N097/00094 12 the electric cable. For the rest, this further embodiment is configured as previously described in connection with figs. 3 and 4.
Claims (8)
1. An extraction device for a plug (10) plugable into a socket (16), said extraction device comprising at least one, centrically positioned, elongate piston-like ejector body (14; 14A; 14B) displaceable to and fro within the plug (10) and possessing two main positions, a first main position where the piston-like ejector body's (14; 14A; 14B) front end is withdrawn in relation to the outer ends of the plug's (10) projecting contact pins (18, 18'), and a second main position where said front end (14'; 14B'''') thereof is positioned substantially as far in front of the foremost face of the plug (10) as the outer ends of said contact pins (18, 18'), the piston-like ejector body (14; 14A) being assigned an activating device (24,28,26,26'; 30,32,34,36,38; 30A,34,36,38) which itself is adapted to be activated, thereby activating the piston-like ejector body (14; 14A), in order to cause a displacement thereof from said first main position to said second main position, whereby the piston-like ejector body exerts a pressure against the socket (16) during said displacement, so that the plug's (10) contact pins (18, 18') are pulled out from the corresponding insertion holes (20, 20') of the socket (16), characterized in that the piston-like ejector body (14;
14A; 14B) partly consists of a ferromagnetic material, and that around it, respectively around a portion or an extension of the same is wound an electrical conducting wire to form a surrounding coil (24) the conductors (26, 26') extending therefrom may be connected, one to earth and the other to a starting engine on a motor vehicle on which the plug (10) is assigned said extraction device.
14A; 14B) partly consists of a ferromagnetic material, and that around it, respectively around a portion or an extension of the same is wound an electrical conducting wire to form a surrounding coil (24) the conductors (26, 26') extending therefrom may be connected, one to earth and the other to a starting engine on a motor vehicle on which the plug (10) is assigned said extraction device.
2. An extraction device as set forth in claim 1, characterized in that the coil (24) is assigned a condenser (28) adapted to accelerate the coil (24).
3. An extraction device as set forth in claim 1 and 2, characterized in that the piston-like ejector body (14A) exists in the form of an elongate, flexible rod, cord or string, a foremost longitudinal portion thereof positioned within the plug (10), while the coil (24), possibly with a condenser assigned thereto, may be spaced at a substantial distance from the plug (10), where the coil (24) surrounds an extension portion (14A') of the piston-like ejector body.
4. An extraction device as set forth in claim 3, characterized in that the longitudinal, flexible, plunger-like ejector body (14A), surrounded by the coil, is assigned a guiding body (42) provided with two longitudinally spaced guiding holes for the extension portion of the ejector body (14A).
5. An extraction device as set forth in one or more of the preceding claims, wherein said piston/ejector body (14) is springloaded towards said second main position constituting the extracting position, and where the piston/ejector body (14) is retained in said first main position constituting an inoperative, withdrawn position of readiness, by means of a blocking means (36) assigned an activating device (38,26,26') for the piston's release from the blocking means (36), characterized in that the activating device comprises a conducting wire coil (38) surrounding the blocking means (36) and, the outgoing end portions (26, 26') thereof, connected to the conductors of the plug conduit, the activating device being assigned a signal decoder/receiver (28) accommodating current to the coil (38) for axial displacement of the blocking means (36) and release of the piston (14) for the extraction of the plug (10) from the socket (16), said signal decoder/receiver (28) being adapted to react on a signal from a transmitter disposed in a vacuum cleaner, an electric hand tool or other electric appliance, etc.
6. An extraction device as set forth in claim 5, characterized in that the activating device's signal transmitter is disposed in connection with a means which, to an other end than plug extraction, becomes operated upon the conclusion of a work, e.g. a spring-loaded push button on a vacuum cleaner adapted to initiate a rotary windlass to wind up the vacuum cleaner conduit, so that said signal transmitter upon the push button's compression simultaneously is influenced in order to generate a signal received by the activating device's signal decoder/receiver (28).
7. An extraction device as set forth in claim 1, 5 or 6, characterized in that the piston-like ejector body which is displaceable to and fro is constituted by a substantially tubular body (14B) the longitudinal axis thereof, preferably, is concentric with the axis of the plug (10), and which is retained in said first main position by means of a blocking means (36), the free blocking end thereof attacking on an abutting face (14B''') formed on the tubular body's (14B) outer mantle face, and that the tubular body (14B) is assigned a pressure spring (30B) which is made operative in order to push the tubular body (14B) forwardly when the blocking means (36) is released by means of an activating device (38,26,26').
8. An extraction device as set forth in claim 7, characterized in that the substantially tubular, piston-like body (14B) is mounted for displacement to and fro within an annulus formed in the plug (10), and that said annulus (52) within the plug (10) has a foremost annular aperture for the substantially tubular, piston-like body's (14B) foremost end, said annular aperture being defined between an inwardly facing, annular flange of the plug and a central, cylindrical portion of the plug (10) in which contact pins (18, 18') with conductors (50, 50') are disposed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO961492 | 1996-04-15 | ||
| NO961492A NO303955B1 (en) | 1996-04-15 | 1996-04-15 | Pull-out puller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2251697A1 true CA2251697A1 (en) | 1997-10-23 |
Family
ID=19899259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002251697A Abandoned CA2251697A1 (en) | 1996-04-15 | 1997-04-10 | Extracting device for plug |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0894346A1 (en) |
| JP (1) | JP2000500911A (en) |
| AU (1) | AU704788B2 (en) |
| CA (1) | CA2251697A1 (en) |
| NO (1) | NO303955B1 (en) |
| WO (1) | WO1997039497A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873275A (en) * | 2019-04-19 | 2019-06-11 | 叶文彬 | A kind of new-energy automobile charging gun |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU785097B2 (en) * | 2001-04-11 | 2006-09-14 | Hill-Rom Pty Ltd | A power cord for a hospital bed |
| DE10260020A1 (en) * | 2002-12-19 | 2004-07-22 | Miele & Cie. Kg | Mains plug for connecting cable of e.g. electrical device or cable drum, has externally heated memory metal wire element as actuator in plug housing for triggering plug ejector pin via separate switch |
| DE112005000087D2 (en) * | 2004-01-13 | 2006-12-07 | Vorwerk Co Interholding | Plug part of an electrical appliance, in particular a vacuum cleaner |
| KR101463598B1 (en) * | 2012-05-18 | 2014-11-25 | 이진국 | Electric access device for electric car |
| CN104993313B (en) * | 2015-07-03 | 2016-08-24 | 国网山东省电力公司金乡县供电公司 | One prevents the mobile excess of stroke and can automatically lock and solve rosette for lock |
| CA2982540C (en) | 2016-10-14 | 2022-09-13 | Power Products, Llc | Cord disconnect apparatus and methods |
| CN107332093A (en) * | 2017-01-24 | 2017-11-07 | 陈佳佳 | A kind of LCDs of automatic control |
| USD924154S1 (en) | 2017-10-16 | 2021-07-06 | Power Products, Llc | Plug |
| CN108134279B (en) * | 2017-12-31 | 2019-03-12 | 慕孟飞 | A kind of power supply plug assembly |
| CN109510052A (en) * | 2018-11-02 | 2019-03-22 | 国网辽宁省电力有限公司丹东供电公司 | A kind of 10 kv cable connect-disconnect plug extracting tools |
| CN113258361B (en) * | 2021-07-07 | 2021-09-14 | 南通科美自动化科技有限公司 | Self-disconnection type emergency protection device for electrical equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3475715A (en) * | 1967-12-11 | 1969-10-28 | Prod Design & Mfg | Self-ejecting plug |
| DE2900491C2 (en) * | 1979-01-08 | 1982-11-18 | Ristovski, Djoko, 7554 Kuppenheim | Electrical plug |
| US4544216A (en) * | 1984-06-04 | 1985-10-01 | Imhoff Robert W | Automatically releasable locking electric plug |
| US4669791A (en) * | 1984-09-06 | 1987-06-02 | Integrated Circuit Systems, Ltd. | Connector apparatus |
| US4820176A (en) * | 1987-09-07 | 1989-04-11 | Shiraishi Electric Corporation | Electric power supply connector |
| JPH01232675A (en) * | 1988-03-11 | 1989-09-18 | Matsushita Electric Ind Co Ltd | Power supply plug removing device |
-
1996
- 1996-04-15 NO NO961492A patent/NO303955B1/en unknown
-
1997
- 1997-04-10 WO PCT/NO1997/000094 patent/WO1997039497A1/en not_active Application Discontinuation
- 1997-04-10 EP EP97917488A patent/EP0894346A1/en not_active Withdrawn
- 1997-04-10 AU AU25788/97A patent/AU704788B2/en not_active Ceased
- 1997-04-10 JP JP9536985A patent/JP2000500911A/en active Pending
- 1997-04-10 CA CA002251697A patent/CA2251697A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873275A (en) * | 2019-04-19 | 2019-06-11 | 叶文彬 | A kind of new-energy automobile charging gun |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997039497A1 (en) | 1997-10-23 |
| AU704788B2 (en) | 1999-05-06 |
| NO961492D0 (en) | 1996-04-15 |
| EP0894346A1 (en) | 1999-02-03 |
| AU2578897A (en) | 1997-11-07 |
| NO303955B1 (en) | 1998-09-28 |
| JP2000500911A (en) | 2000-01-25 |
| NO961492L (en) | 1997-10-16 |
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