WO2006043847A1

WO2006043847A1 - Type a and b electric outlet with plug extractor

Info

Publication number: WO2006043847A1
Application number: PCT/RO2005/000005
Authority: WO
Inventors: Silviu Ristea
Original assignee: Silviu Ristea
Priority date: 2004-10-21
Filing date: 2005-06-21
Publication date: 2006-04-27

Abstract

This invention relates to an electric outlet with plug extractor, for type A and B power supply systems, with flat prongs, with or without earth connection. The electric outlet with plug extractor, according to this invention, provides at least one pair of extracting arms (11...14) which are jointed mounted on the surface of the front panel (1). The extracting arms border a guiding block (5 or 6) and work in tandem to extract a plug (9) from the outlet when pressed and rotated with one hand's fingers. By moving the extracting arms (11...14), two prismatic members (u) of them simultaneously go under the plug (9) body and, acting on the chock principle, easily extract and eject the plug (9) from the outlet and then return to the initial position, driven by the returning springs (15 and 16) mounted behind the front panel (1).

Description

Type A and B electric outlet with plug extractor

This invention relates to an electric outlet with plug extractor for use in the power supply systems of A and B types, according to the international classification, using laminated metallic prongs placed in various configurations, required to connect the monophasic domestic and industrial consumers to the power network.

This invention may be applied both for electric outlets without protection contact and especially for wall outlets with protection contact, single or double. The use of this invention requires only a few modifications of the electric outlet's front panel.

The electric outlet, as known, generally consist of a receiving assembly fitted with contact blades, which receive the prongs of the plug and which exert a significant pressure to the plug's prongs. Therefore, withdrawing the plug from the outlet requires an axially exerted force, which increases when the number of contacts increases, e.g. for the electric outlets with protection contact.

US Patent No. 2,977,564 describes an electric outlet provided with a plug ejector, A and B type, with flat prongs, this outlet having an external S-shaped member with a flat portion with openings for plug's prongs, the S-shaped member being interposed between the external flat face of the outlet and the plug's frontal side. The flat portion of the ejector continues on the upper side of the outlet, bended at 90 degrees, and then with a handle-like curved portion, which is pushed toward the wall to extract the plug.

Also known is an electrical outlet with plug extractor, described in US Patent 4,042,292, which is provided, for each of its two posts, with a round release plate having openings aligned to the corresponding outlet receptacles. Extending from the distal edges of the release plates are corresponding levers, joined to the release plates by way of a convolved joining surface. A pressure is applied to these levers to extract the plug.

In the normal standing position, the joined release plate completely covers the receptacle side of the front panel, laying between this plate and the housing of the electric plug, when the plug is inserted in the outlet. To extract the plug from the outlet, the lever is pressed with a finger and rotates in its joint, acting on the plug housing.

A first drawback of these known approaches is the rotation of a mobile element disposed under the plug, this rotation tending to exercise an extraction force which has an angle against the electric plug axis, this fact hardening and even making the plug extraction impossible, especially when the plug has a protection contact eccentrically disposed relative to the prongs axis.

In both solutions, the joint elements required for extraction are of relatively big size and, besides, extend beyond the surface of the outlet frontal plate, giving an unpleasant look. This leads also to the possibility of hitting and damaging the joint elements, or even accidentally triggering them, interrupting this way the supply of electrical power to the consumers.

Furthermore, the outlet of US Patent 4,042,292 has a low reliability, being possible to break the lever in the release plate joining region, as a result of repeated acting, the lever being made usually in plastic, as the release plate is.

On the other side, to be mechanically resistant, the release plate must be as thick as possible, this requirement leading to a smaller penetration depth of the plug prongs in the outlet body.

This invention addresses the issue of obtaining an axial oriented extraction force, in the same time exerting a counterforce that firmly keeps the outlet in its mounting position.

The electric outlet with extractor, according to the invention, cancels the aforementioned drawbacks by providing al least one pair of extracting arms, jointed mounted to the surface of the frontal plate, which in their normal, standing position, border a guiding block protruding from the inside part of the outlet to exterior through the frontal plate allowing the plug to pass to the guiding blocks openings, in order to connect the plug to the outlet, wherein the extracting arms act simultaneously, working in tandem, to extract a plug from the socket when they are pressed with the fingers and rotated in the corresponding joints, two prismatic members, symmetrically disposed relative to the plug, simultaneously enter under the plug body; after the plug extraction and freeing of extracting arms, these arms are repositioned to the initial standing position, by springs mounted on the back of the frontal plate. The extracting arms rotation movement is guided by two channels, having a circular arc shape, opened in the frontal plate and by a gliding plate which supports and guides the extractor arms returning spring, wherein the spring is kept and guided on the gliding plate by a prominence and a screw head, this screw passing through the channel and screwing in the prismatic member of the extracting arms.

The said gliding plate is free to rotate around the axis of the screw that goes in the extracting arms member. This plate has a curved side, oriented transversally to the guiding channel, so as at the end of the active run the gliding plate centers itself and hits a cylindrical surface of the guiding blocks, causing the plug to be ejected from the outlet.

AU the components of the extractor are mounted only on to the frontal panel of the outlet, before and behind this panel, forming a detachable assembly, easy to manufacture and maintain.

The extracted arms are provided with active surfaces separated by a channel and slanting at different angles relative to the plain surface of the front panel, with a difference of 5° to 7° between these angles.

The active surface which is closer to the rotational axis of the extracting arms is slanted at a greater angle than the slanting angle of the other active surface, which is farther to the rotational axis of the extracting arms.

The active surfaces of the extracting arms intersect to a plain surface, that is the bearing surface of the extracting arms to the surface of the front panel, forming sharp attack edges, situated on the same line as the rotational axis of the extracting arms.

The axis of the extracting arm channel runs a bow around its rotational axis, that is tangent to the symmetry axis on which the guiding openings for the plug's prongs are disposed.

In an alternative embodiment of this invention, one may use at least one pair of extracting buttons instead the extracting arms, mounted right to the external surface of the front panel, symmetrically to the guiding group formed by the guiding openings for the plug's prongs, wherein the extraction of the plug from the outlet is performed by the crossing translation movement of the extracting buttons, pushed with the fingers, and the return in the normal distant position is provided by the springs mounted behind the front panel.

The extracting buttons translation movement is guided by a pair of parallel channels, opened in the front panel in a transversal direction, each channel guiding a screw that connects the extracting button and a gliding plate mounted behind the front panel.

The extracting buttons are also provided with two active, curved, concave surfaces, defined by a cylindrical surface with a radius R₁ of 30 to 34 cm, tangent to the setting surface of the extracting buttons.

The active surfaces of the extracting buttons are situated, in any working position of the outlet, symmetrical to the guiding openings for the plug's prongs.

Opposite to the active surfaces of the extracting buttons is a drive surface, slanted by a 60° to 70° angle relative to the setting surface.

In the normal rest position, the extracting buttons are situated on the front panel of the outlet, so as the distance between the edges of the active surface belonging to one button and the opposite edges of the other button, is less than the width of the plug, which, when plugged in the outlet, is partially superposed to the active surfaces, with a 1 to 1,5 mm overlap.

This invention has the following advantages:

- extends the application field of the extracting devices to the type B connection assemblies, having an earth contact;

- substantially reduces the force required to pull out the plug, by amplifying the finger's pushing force;

- increases the reliability, canceling the possibility of unconscious pulling out the plug by hitting or accidentally touching of the extracting elements;

- simple construction, with a facile handiness and an increased reliability for the whole connecting assembly (plug and outlet);

- simple and cheap adaptation for the existing outlets, requiring only modification of title outlet's front panel;

- compact construction, with reduced dimensions and modern and neat design. Following is an example of the invention, in connection to the accompanying drawings 1 to 14:

- figure 1 is a general view of an electric outlet with plug extractor and two posts, one free and one in the extracting position;

- figure 2 is a rear view of the electric outlet with plug extractor from fig. 1;

- figure 3 is a front view of the electric outlet with plug extractor from fig. 2;

- figure 4 is a front view of the front panel of the electric outlet with plug extractor;

- figure 5 is a partial cross section, following the A-A plane from fig. 3;

- figure 6 is a top view of the electric outlet with plug extractor along the B arrow in fig.1, represented when the plug and the outlet are being separated;

- figure 7 is a plane view of an extracting arm, at a larger scale;

- figure 8 is a side view along the arrow C in fig. 7;

- figure 9 is a partial perspective view of the fig. 7 extracting arm's active surfaces;

- figure 10 is a partial front view of the electric outlet with plug extractor in another embodiment;

- figure 11 is a partial rear view of the electric outlet in fig. 10;

- figure 12 is a partial view of the front panel of the outlet in fig. 10 and 11;

- figure 13 is a top view along the arrow D of the outlet in fig. 10, having a plug connected;

- figure 14 is a perspective view of an extracting button.

In the hereinafter described embodiment, this invention is presented in relation to a conventional wall outlet, B type, with two posts, each post provided with a receptacle for flat shape pins (prongs) and a cylindrical earth contact, for use together with power plugs widely employed for domestic and industrial appliances. Obviously, it is possible to use this invention with other types of outlets, with appropriate adaptation to their configuration, especially to the configuration of the contacts group.

As shown in fig. 1, the electric outlet with plug extractor, according to this invention, comprise a front panel 1 assembled in a well known manner, using a screw 2, to a receptacle 3 mounted behind the front panel 1 and visible in fig. 2, this receptacle being introduced and firmly fixed, when the outlet is installed, in a metallic can, not shown in figures, placed in a wall opening 4.

^' Therefore, the front panel may be detached from the receptacle 3, making very simple and convenient the adaptation of this invention for usual, conventional, outlets, due to the fact that a small number of modifications is required only for the front panel 1 — as shown hereinafter — the rest of outlet elements remaining unmodified.

As shown in fig. 3, the front panel 1 is provided, in well known manner, with two oval openings a and b in which two guiding block 5 and 6 of the receptacle 3 enter and center themselves.

The blocks 5 and 6 are provided with two rectangular guiding openings c and d, symmetrically placed to the horizontal axis e and corresponding to the two prongs 7 and 8 ofthe plug 9.

Under the openings c and d, the front panel 1 has a third guiding opening f, corresponding to the cylindrical earth contact 10 of the plug 9, presented in fig. 1 and, at a larger scale, in fig. 6.

Two extracting arms 11 and 12 are placed on the external plain surface of the front panel 1, symmetrically to the upper guiding block 5 and, similarly, two other extracting arms 13 and 14 are placed sideways the lower guiding block 6.

The extracting arms 11 and 12 can easily swivel around the rotational axes g and h, respectively, and the extracting arms 13 and 14 can easily swivel in the same way around the rotational axes i and j.

When a plug 9 is not connected to the receptacle 3 of the electric outlet or when a plug 9 was connected to the plug, the extracting arms 11 and 12 are in a distant, rest position, bordering the guiding block 5 and allowing the plug 9 to pass to the guiding openings c, d and f of the electric outlet, this situation being presented in fig. 1, upper side. When a consumer needs to be disconnected from the outlet — situation represented in fig. 1, lower side — the extracting arms, 13 and 14 in this case, are pushed one toward another with one hand's fingers, easily extracting the plug 9 from the outlet. When the extracting arms 13 and 14 are released, they are forced back to the normal, rest position, by two two-armed springs 15 and 16, made of steel wire and mounted behind the front panel 1, as shown in fig. 2. To avoid the electrocution danger for the users and short-circuits between plug 9 prongs, the extracting arms 11 to 14 are made from electrically insulating materials, currently employed for other components of the electric outlet. The springs 15 and 16 have a loop k, a cylindrical nail 17, formed in the same time with the front panel 1 passing by this loop and then being hot riveted to keep the spring 15 or 16 behind the front panel 1, as shown in fig. 5. The front panel 1 provides pairs of openings 1 and m, acting like bearings, to mount the extracting arms 11 to 14 with the notched bolts 18, which allow the extracting arms rotation relative to the front panel 1 surface. Maintaining the position of extracting arms 11 to 14 on the front panel 1 is also provided by the channels n and o, shaped as circle arcs of radius r and circle centers on the 1 and m openings axes and on the rotational axes g, h, i and j of the extracting arms 11 to 14, respectively.

On the rear side of the front panel 1, above the channels n and o, a gliding plate 19 is mounted and fixed to the extracting arms 11 to 14, e.g. using a screw 20, as shown in fig. 5.

The gliding plate 19 has a knob p, near the screw 20 head, contacting one of the arms of spring 15 and 16. Also, the gliding plate 19 — as one can observe in fig. 2 — has a curved side q, limiting the rotation movement of the extracting arms 11 to 14 when extracting the plug 9, by hitting a cylindrical surface s of the guiding blocks 5 and 6, the gliding plate 19, which can easily rotate around the screw 20 axis, being able to centre itself relative to the guiding blocks 5 and 6.

An extracting arm 11 to 14, as shown at a larger scale in figures 7 to 9, consists of two parts, a narrow curved arm t, provided at one end with the notched bolt 18, this arm progressively heightening — as on may observe in fig. 8 — until connection with a prismatic member u, fork shaped. The two parts t and u have a common lower plain surface v, providing the contact of extracting arms 11 to 14 with the plain surface of front panel 1. A channel z separates two active surfaces x and y which, when the plug 9 is extracted, go under the plug's body, as in fig. 6.

The extracting active surfaces x and y are slanted at different angles (X₁ and α₂ against the plain surface v. The extracting active surfaces x and y intersect the supporting plain surface v, forming the attack edges Wi and W₂ which are placed on a line passing through the rotation axis g of the extracting arm 11 to 14.

The attack edges Wi and W₂ travel through circle arcs of different radii around the rotation axis g during the plug extraction, therefore the slanting angles (X₁ and α₂ of the active surfaces x and y must have different values, based on the equation (X₁ - α₂ = 5°..7°.

Therefore, the two active surfaces x and y will act with equal, conjugated force, on the body of the plug 9, exerting an extraction force on it, parallel with its prong axes.

The width of the z channel of the prismatic member u is selected to be greater than the maximum width of the prongs 7 and 8 of the plug 9.

The extracting arms rotation axes, working in tandem, for example the extracting arms 11 and 12, are symmetrically positioned on the front panel 1 (using the openings 1) in such a way that the active surfaces x and y will correctly border the guiding openings c and d of the outlet block 5 — as shown in figure 3.

For this purpose, the circle arc a' described by the channel z axis relative to the rotation axis of the extracting arm 11 to 14 must be tangent to the symmetry axis e that runs through the guiding openings c and d axes of the plug 9 prongs.

This way, when extracting the plug 9, by rotating and approaching the extracting arms 11 and 12, the active surfaces x and y simultaneously go under the plug 9 body, without touching the plug 9 prongs.

For a correct orientation and positioning of the finger tips and for an optimum application of the pushing force to the extracting arms 11 to 14, the alveoli b' and c' are practiced both on the prismatic member u, opposite to the z channel and on the curved arm t.

Based on the inclined plane mechanism principle, when pushing the extracting arms 11 to 14, these arms interact with the plug 9, amplifying the pushing force; therefore, the friction forces in the contact block are exceeded, the plug 9 being slowly extracted and then, when the gliding plates 19 hit the guiding blocks 5 or 6 of the outlet, behind the frontal plate 1, the plug 9 is ejected. During the extraction of the plug 9 reaction forces appear, normal to the front panel 1 and oriented to the wall; the outlet is therefore not affected in any way, keeping its mounting position and eliminating the risk of tearing the outlet from the wall and damaging the power circuits.

One may observe that all the elements of the extracting device(s) are mounted only on the front panel 1 of the outlet, in front of rear of it, forming together a detachable assembly, easy to manufacture and install, easy to sell and maintain.

In another embodiment, presented in figures 10 to 14, the rotation movement of the extracting arms 11 to 14 is replaced by a translation movement of the mobile elements, namely the extracting buttons 21 and 22.

The extracting buttons are symmetrically placed on the front panel 1, one side and another of the guiding blocks 5 and 6 belonging to the outlet receptacle 3.

The extracting buttons 21 and 22 easily travel on a transversal direction, sliding on front panel 1. In the normal rest position, without a plug being plugged in the outlet, or when a plug was connected, the extracting buttons 21 and 22 remain permanently in a distant position, as in the upper side of the figure 10.

When a consumer must be unplugged, by extracting the plug 9, previously plugged, from the outlet, the extracting buttons 21 and 22, corresponding to the relevant post, are closed in by pushing with one hand's fingers and, after extracting the plug 9, the extracting buttons reach their extreme position, presented in the lower side of the figure 10.

When released, the extracting buttons 21 and 22 return in the normal, rest position, due to the springs 15 and 16 mounted behind the front panel 1, the same way as in the electric outlet presented in the figures 1 to 9.

As one may observe in figure 10, the springs 15 and 16 drive the extracting buttons 21 and 22 through the gliding plates 23, mounted on the rear of the front panel 1 and fitted each over a pair of guiding channels d' and e' provided in the front panel 1, each side of the oval openings a and b.

The guiding channels d' and e' are parallel each other and transversally oriented — as in figure 12 — performing the guidance of the extracting buttons 21 and 22 in their rectilinear movement, each of these buttons being connected to a gliding plate 23 with two screws 24 and 25.

The screws 24 and 25 are driven behind the front panel 1, through the two openings provided in the gliding plate 23, then pass through the guiding channels d' and e' and then screw in the body of the extracting buttons 21 and 22, as in figure 13. The two screws 24 and 25, together with a knob P provided on the gliding plate 23 ensure the permanent contact with the return spring 15 and 16 arms.

The gliding plate 23 also has a curved side g', which limits the translation movement of the extracting buttons 21 and 22 during the plug 9 extracting stroke, by hitting the cylindrical surface s of the guiding blocks 5 and 6.

An extracting button 21 or 22, presented at a larger scale in figure 14, has a prismatic shape, provided in the lower part with a plain supporting surface h', that has two perpendicular holes i' for the screws 24 and 25.

The extracting button 21 or 22 has a channel j' separating two active surfaces k' and 1'. Unlike the active surfaces x and y of the extracting arms 11 to 14, which are plain surfaces, the active surfaces k' and 1' are curve, concave surfaces, generated by a cylindrical surface having a radius R₁ = 30...34 mm, tangent to the supporting surface h', forming two collinear edges m' and n'.

Opposite to the active surfaces k' and 1' is a drive surface o', slanted at an angle β against the supporting surface h', the drive surface o' having a depression p', designed to support the finger and to direct the pushing force to an optimum direction, given by the angle β = 60°..70°.

Contiguous to the drive surface o', prolonging the prismatic body of the extractor button to the opposite side of the active surfaces k' and 1', is a thin member q', which covers the guiding channels d' and e' when the extracting buttons are closed in to extract the plug 9.

Using the pair of guiding channels d' and e', practiced in the front panel 1 of the outlet, the extracting buttons 21 and 22, working in tandem, are positioned on the front panel 1 so that their symmetry planes s' and t' contain the symmetry axis e of the guiding openings c and d, corresponding to the prongs 7 and 8 of the plug 9, as shown in figure 10. This way, the active surfaces k' and I' of the extracting buttons 21 and 22 correctly border the guiding openings c and d of the outlet and, therefore, the prongs 7 and 8 of the plug 9, when the plug is connected to the outlet.

In the same time, by placing in a transversal direction and by choosing a length for the guiding channels P and e', a transversal position for the extracting buttons 21 and 22 is obtained, so that in the rest position the edges m' and opposite n', respectively, of the two extracting buttons 21 and 22, are placed at a distance u' less than the width v' of the plug 9, as shown in figure 10 (the hatched area represents the projection of the plug 9 body to the guiding block 5 of the outlet).

Therefore, when a plug 9 is plugged into the outlet — see figure 13 — the body of the plug 9 is partially superposed to the active surfaces k' and 1', with an overlap of 1 to 1,5 mm.

The front side of the plug 9 body is about 0,3 to 0,5 mm far away from the front panel 1, which does not affect the electric connections, but facilitates the initiation of the plug 9 extraction.

Based on the inclined plane principle, the active surfaces k' and I', having a cylindrical shape, interact with the body of the plug 9, simultaneously applying a couple of conjugated and balanced forces, which exceeds the resisting friction forces between the prongs of the plug 9 and the receptacle 3 of the outlet, including the eccentric force generated by the earth contact 10.

This way, the pushing forces required to extract the plug are reduced by 15...20%, reducing the human effort and, in the same time, ensuring the integrity of both the outlet an plug and eliminating the risk of damaging the electric circuits, producing of short-circuits and even electrocution.

Claims

1. Type A or B electric outlet with plug extractor, for domestic or industrial use, consisting of a detachable front panel, having mounted behind a receptacle with one or more groups of contacts to be connected wit one or more plugs, having or not having a protection contact, characterized in that at least one pair of extracting arms (11 and 12 or 13 and 14) is provided, which are jointed mounted on the surface of the front panel (1), bordering in normal position a guiding block (5 or 6) protruding from inside the outlet to the exterior through the front panel (1) and allows the access of the plug (9) to the openings of the guiding block (5 and 6) to provide the connection of the plug (9) to the outlet, wherein the extracting arms (11...14) work together in tandem to extract a plug (9) from the outlet when pressed with the fingers, swinging around their joints, so that two prismatic members (u), symmetrically arranged relative to the plug (9), simultaneously go under the body of the plug (9) and, after the plug extraction and release of the extracting arms (11...14), the arms are returned in the initial rest position by two springs (15 and 16) mounted behind the front panel (1).

2. Electric outlet with plug extractor, according to the claim 1, characterized in that the rotation movement of the extracting arms (11...14) is guided by two channels (n and o), having a circle arc shape, provided in the front panel (1) and by a gliding plate (19) which supports and guides the returning spring (15 and 16) of the extracting arms (11...14), maintained and guided on the guiding plate (19) by a knob (p) and by the head of a screw (20) that passes through the channel (n and o) and screws into the prismatic member (u) of the extracting arms (11...14).

3. Electric outlet with plug extractor, according to the claim 1, characterized in that the said gliding plate (19) freely rotates around the axis of the screw (20) that goes into the body of the extracting arm (11..14) and has a curved side (q) oriented transversally to the guiding channel (n and o), so that at the end of the working motion of the extracting arms (11..14) the gliding plate (19) centers itself and hits a cylindrical surface (s) of the guiding blocks (5 and 6) ejecting the plug (9) from the outlet.

4. Electric outlet with plug extractor, according to the claim 1, characterized in that all the components of the extractor are mounted only on the front panel (1) of the outlet, both in front and rear of it, forming a detachable assembly, easy to manufacture and maintain.

5. Electric outlet with plug extractor, according to the claim 1, characterized in that the extracting arms (11..14) are provided with the active surfaces (x and y) separated by a channel (z) and slanted at different angles ((X₁ and α₂) against the plain surface of the front panel (1), according to the relation (X₁ - α₂ = 5°...7°.

6. Electric outlet with plug extractor, according to the claim 5, characterized in that the active surface (x) that is closer to the rotation axis (g... j) of the extracting arms (11..14) is slanted at a greater angle ((X₁) than the slanting angle (α₂) of the other active surface (y), more distant to the rotation axis (g... j) of the extracting arms (11.14).

7. Electric outlet with plug extractor, according to the claim 5, characterized in that the active surfaces (x and y) intersect a plain surface (v) that supports the extracting arms (11..14) on the front panel (1), forming the attack sharp edges (W₁ and W₂) aligned with the line that passes through the rotation axis (g... j) of the extracting arms (11..14).

8. Electric outlet with plug extractor, according to the claim 1, characterized in that the circle arc (a') described by the channel (z) axis of the extracting arm (11..14) around its rotation axis (g...j) runs tangent to the symmetry axis (e) of the guiding openings (c and d) corresponding to the prongs (7 and 8) of the plug (9).

9. Electric outlet with plug extractor, according to the claim 1, characterized in that, in an alternative embodiment, at least one pair of extracting buttons (21 and 22) are used instead of extracting arms (11...14), wherein the extracting buttons (21 and 22) are mounted directly on the outside of the front panel (1), symmetrical to the guiding group (5 or 6) that contains the guiding openings (c, d and f) for the prongs of the plug (9), wherein the plug is extracted from the outlet by the translation movement, transversally oriented, of the extracting buttons (21 and 22) pressed with one hand's fingers and the return in normal distant position is provided by two springs (15 and 16) mounted behind the front panel (1).

10. Electric outlet with plug extractor, according to the claim 9, characterized in that the translation movement of the extracting buttons (21 and 22) is guided by a pair of parallel guiding channels (d' and e') provided in the front panel (1) in transversal direction, the screws (24 and 25) gliding through these channels, wherein the screws (24 and 25) connect the extracting buttons (21 and 22) to the gliding plates (23) mounted behind the front panel (1).

11. Electric outlet with plug extractor, according to the claim 9, characterized in that the extracting buttons (21 and 22) have two curved, concave active surfaces (k' and 1'), defined by a cylindrical surface of a radius R₁ = 30...34 mm, tangent to the supporting surface (h') of the extracting buttons (21 and 22).

12. Electric outlet with plug extractor, according to the claim 9, characterized in that the active surfaces (k' and I') of the extracting buttons (21 and 22) are situated, in any working position of the outlet, symmetricaly to the guiding openings (c and d) for the prongs (7 and 8) of the plug (9).

13. Electric outlet with plug extractor, according to the claim 9, characterized in that opposite to the active surfaces (k' and 1') of the extracting buttons (21 and 22) is a drive surface (o'), slanted at an angle (β) against the supporting surface (h')₅ wherein the values of angle β are in the range of 60° ...70°.

14. Electric outlet with plug extractor, according to the claim 9, characterized in that in normal rest position, the extracting buttons (21 and 22) are placed on the front panel (1) of the outlet so that the edges (m' and n') of the active surfaces (k' and 1') of an extracting button (21) and the edges (m' and n') of the other extracting button (22) are situated at a distance (u⁵) less than the width (v') of the plug (9) and, when the plug is plugged into the outlet the body of the plug 9 is partially superposed to the active surfaces (k' and F), with an overlap of 1 to 1,5 mm.