SK116297A3 - Plug for an electrical device - Google Patents

Abstract

An electrical connecting plug of a type that connects with an item of equipment has a moulded body of insulating material [1]. The end section has a pair of rectangular entry points [6] and internally there are contacts for live and neutral. A circular hole [7] is provided for an earth connection. The plug fits into a shaped aperture in the equipment housing and this has inset connector pins.

Description

The invention relates to an electrical appliance socket having at least two flat pin receptacles, the socket being non-circular in cross-section perpendicular to the insertion direction and symmetrical with respect to the axis of symmetry extending transversely to the larger transverse dimension of the socket. The invention also relates to a plug for an electric fork-type apparatus and a receptacle adapted thereto, wherein the fork-receptacle and the receptacle are non-circular in cross-section perpendicular to the insertion direction and symmetrical to the axis of symmetry extending transversely to the largest dimension of this cross-section.

BACKGROUND OF THE INVENTION

Such sockets for electrical appliances are widely known. The socket together with the plug plugs into this socket form a socket-plug combination of the electrical apparatus, which allows the electrical apparatus to be disconnected from the power cord. The socket is located on the power supply cord and the plug is fixed in the electrical apparatus so that the plug pins cannot be energized when not connected. A distinction is made between sockets and plugs with protective conductor and without protective conductor. Known sockets and plugs without a protective conductor have a cross-section composed essentially of two adjacent sections of circular arcs. In the cross-section delimited by these circular arc sections, pin receptacles are provided. These sockets and plugs are used to connect devices with protective insulation, such as portable radios or the like. Protective conductor sockets and plugs are used to connect, for example, computers, monitors or hi-fi devices. A distinction should be made between sockets and plugs for electrical equipment that become hot or non-hot during operation. Sockets and plugs for warming up electrical devices must withstand higher temperatures. For these socket-plug assemblies, sockets with a substantially rectangular cross-section with two substantially bevelled corners are preferably used on the power supply side. In relation to the dividing axis, which runs parallel to the larger cross-sectional dimension, the markedly bevelled corners are arranged at the top, i.e. above the dividing axis. The cross-sectional area below the dividing axis has only slightly rounded corners. This implies that the cross-section is asymmetrical with respect to said dividing axis, which gives the user visual instructions for inserting the drawer in the correct position. In the area of the cross-sectional area with bevelled corners, a bed for a flat pin is arranged approximately in the middle, into which the protective contact pin of the plug is inserted when the socket is connected to the fork. In the remaining cross-sectional area of the drawer there are two flat-pin receptacles in which there is voltage when connected to the mains. Both of these pins for the supply of current to the pins and the socket for the protective contact are arranged at the vertices of the triangle.

In view of the prior art described, the object of the invention is to provide a socket structure for an electrical apparatus which is characterized by a geometrically simple, stable and ergonomically advantageous solution.

SUMMARY OF THE INVENTION

The problem is solved and the drawbacks of known electrical sockets are largely eliminated by an electrical socket with at least two flat pin receptacles, the socket being non-circular in cross-section perpendicular to the insertion direction and symmetrical to the axis of symmetry extending across the larger transverse dimension of the socket. according to the invention, characterized in that the dividing axis extends transversely to the axis of symmetry and the cross-section of the drawer above and below this dividing axis is defined by convex arcs, the two convex arcs having essentially the shape of circular arc sections and having different radii. The cross-section thus has an ellipse-like shape, the transition regions between said convex arcs being also rounded. An embodiment in which the radius of the convex arc located above the dividing axis is greater than the radius of the convex arc located below the dividing axis is preferred. For example, the radius of the upper convex arc may be in the range 45 to 55 mm, preferably 50 mm, while the radius of the lower convex arc is in the range 35 to 40 mm, preferably 37 mm. It is essential that the center of the convex arc with a larger radius is outside the total cross-sectional area of the drawer, while the center of the convex arc with a smaller radius is located within the area of this overall cross-section, both centers being located on the axis of symmetry of the drawer. In addition, it is possible for the two convex arcs which extend above and below the dividing axis to be composed of sections of circular arcs with different radii from each other. Such a solution then results in an ergonomically advantageous design of the drawer. The drawer in this embodiment is particularly well gripped by hand. The visual instructions for positioning the receptacle correctly on the respective plug for the user already mentioned in the prior art result from the asymmetrical non-circular design of the cross-section of the receptacle and the respective plug.

A further preferred embodiment of the drawer according to the invention is that the cross-sectional dimension of the drawer between the transition areas connecting different convex arcs to each other is clearly greater than the perpendicular largest dimension of this cross-section. This solution results in a relatively flat design of the drawer. Together with the cross-sectional areas above and below the dividing axis, which are delimited by convex arcs in the form of parts of circular arcs, this results in an ergonomically advantageous drawer shape. A ratio of dimensions in the range of 15: 10 to 20: 10, in particular 17: 10 is preferred. In a preferred embodiment, the larger cross-sectional dimension is approximately 34 mm and the smaller dimension perpendicularly measured is approximately 20 mm. It is further preferred that the insertion depth of the receptacle into the plug receptacle in the electrical apparatus approximately corresponds to the largest dimension of the receptacle cross-section. That is, the ratio of the largest dimension of the receptacle cross-section to the insertion depth of the receptacle into the fork bed is approximately 1: 1, which, taking into account the above dimensions, means that the insertion depth of the receptacle into the fork bed is approximately 34 mm.

It is further preferred that the flat pin receptacles are arranged asymmetrically with respect to the dividing axis between the transition regions and are displaced towards a cross-sectional area defined by a more curved convex arc. As already indicated, the socket is asymmetrical with respect to the dividing axis, i.e. the connection between the transition regions. At the same time, however, the socket is symmetrical with respect to the axis of symmetry which extends perpendicular to said dividing axis. Accordingly, in the case of a symmetrical arrangement of the flat pin receptacles with respect to the axis of symmetry, which extends perpendicularly to the junction of the transition regions, these flat pin receptacles are simultaneously arranged asymmetrically with respect to said dividing axis. In a preferred embodiment of the drawer, in which the convex arcs defining the cross-sectional areas of the drawer above and below this junction, i.e. the dividing axis, have different radii from each other, the flat pin receptacles are displaced towards a more curved convex arc, i.e. the radius of the convex arc delimiting this region. It is advantageous for the flat pin receptacles to be displaced parallel to the connection between the transition regions, i.e. the dividing axis, so that the connection between the centers of the flat pin receptacles passes at least approximately the center of gravity of the entire cross-sectional area of the drawer. The convex arcs with different radii of each other do not coincide with the intersection of the junction of the two transition regions with an axis of symmetry that runs perpendicular to this junction. The dowel beds are otherwise similar to those known in the art, i.e. they have a rectangular orifice in cross-section. In the receiving opening, which extends in the longitudinal direction of the drawer, there is a metal clamping sleeve which represents the electrical contact.

A further improvement of the drawer according to the invention is that the drawer is provided with a snap-in thumb protruding from its circumference, which is springed perpendicular to the longitudinal direction of the flat pin receptacles. This measure ensures that the socket-plug system is secured against unwanted disconnection. When the plug is inserted into an appropriately designed fork seat in the electrical apparatus, the snap-in thumb engages in a corresponding recess. This engagement can be unlocked only consciously, by means of a corresponding pushbutton or the like arranged in the region of the fork-type bed. A snap-on thumb which is arranged on the drawer can be pushed against the action of the compression spring by means of a button on the electrical apparatus, so that the drawer can then be pulled out of the fork-type receptacle in the electrical apparatus. The described protection against pulling out the drawer is particularly advantageous when using the drawer according to the invention in conjunction with movable electric devices such as dust vacuum cleaners, electric lawn mowers and the like. In these cases, otherwise, due to the tensile stress of the electrical supply cord and socket, the socket may be unintentionally pulled out of the plug receptacle in the electrical apparatus. The snap-in thumb according to the invention avoids this.

It is further preferred that the snap-in thumb is arranged on the less curved outer side of the drawer.

It is particularly advantageous if the snap-in thumb is arranged approximately midway between the flat pin receptacles. In a preferred embodiment in which the upper cross-sectional area of the drawer is delimited by a less curved convex arc, the snap-in thumb arrangement has the advantage that the snap finger is in an ergonomically favorable position when gripping the drawer so that it can simply be pressed with the thumb , which then allows the socket to be plugged into a plug receptacle in the electrical apparatus. It is also possible for the fork receptacle in the electrical apparatus to be provided with a lead-in chamfer for this snap-in thumb which causes the snap-in thumb to be compressed when the plug is inserted.

As mentioned above, the socket can be equipped with a protective contact. This can be done in such a way that a round plug receptacle is arranged between the flat pin receptacles in the cross-section of the drawer. In the direction of the height, this bed is moved towards a more curved convex arc, i.e. in the lower region of the drawer cross-section. However, an embodiment is preferred in which a round pin receptacle in a drawer cross section is arranged between the flat pin receptacles. In an embodiment of the protective conductor socket, the round pin receptacle is provided with a corresponding round contact clamping sleeve. In the embodiment of the socket without protective contact, the socket for the round plug is electrically non-conductive, i.e., made blind.

The invention further relates to a fork of an electrical apparatus having a forked bed and a receptacle adapted thereto, wherein the forked bed and the receptacle are non-circular in cross-section perpendicular to the insertion direction and symmetrical to the axis of symmetry extending transversely to the largest dimension of this cross-section. The principle of the invention consists in that the dividing axis extends perpendicular to the axis of symmetry and the cross-sectional areas above and below this dividing axis are defined by convex arcs, the two convex arcs having essentially the shape of segments of circular arcs with different radii. The described solution achieves a geometrically simple construction with an excellent course of insertion of the drawer, since the fork bed guides the drawer when it is inserted into the fork bed. When the drawer is slightly rotated, the convex arcs ensure that the drawer is rotated relative to the fork bed. The drawer is automatically brought into the necessary insertion position. It also follows from the described geometric ratios that, despite only a slight asymmetry, effective blocking is ensured in case of erroneous handling. For example, it is not possible to insert the drawer into the forks in a 180 ° inverted position. In this case, the forklift guidance also does not apply. The user cannot then connect the plug to the plug in the electrical appliance or force it, thus eliminating the malfunction of the system.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is further elucidated with reference to the accompanying drawings, in which:

FIG. 1 is an overall perspective view of a first embodiment of an electrical appliance receptacle according to the invention, with a power cord and a conventional electrical plug;

FIG. 2 is a perspective cross-sectional view of a fork of an electrical apparatus, with a fork seat, also relating to the first embodiment;

FIG. 3 is a side view of the drawer of FIG. 1 and the plug of the electrical apparatus of FIG. 2, partly in section;

FIG. 4 is a view corresponding to FIG. 3, but with the plug plugged into the plug receptacle in the plug of the electrical apparatus;

FIG. 5 is a perspective view of a second embodiment of the drawer;

FIG. 6 is a front view of the drawer of FIG. 5;

FIG. 7 is a side view of the drawer;

FIG. 8 is a plan view of the drawer;

FIG. 9 is a cross-sectional view of the receptacle in the plane IX - IX of FIG. 8 bed area for flat pin;

FIG. 10 is a section along the line X - X of FIG. 9;

FIG. 11 is a front view of a second embodiment of a plug of an electrical apparatus arranged in the electrical apparatus;

FIG. 12 is a section on the XH-ΧΠ plane of FIG. 11;

FIG. 13 is a view corresponding to FIG. 4, but relating to a second embodiment of the socket and plug of the electrical apparatus of FIG. 5 to 12;

FIG. 14 is a view corresponding to FIG. 11, but relating to the third embodiment;

FIG. 15 is a section on the line XV - XV of FIG. 14;

FIG. 16 is a view corresponding to FIG. 13, but the drawer in the second embodiment of FIG. 5 to 10 are plugged into the plug of the electrical apparatus of the third embodiment of FIG. 14 to 15;

FIG. 17 is a side view of a third embodiment of the drawer;

FIG. 18 is a view corresponding to FIG. 6, but relating to the embodiment of FIG. 17; and

FIG. 19 is a plan view of a third embodiment of the drawer.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1 shows the drawer! for an electrical apparatus 10 with a power cord 2 connected to this socket 1 and a conventional power plug 3, which is connected to the other end of the power cord 2. In FIG. 1 to 4, a first embodiment of this drawer L is shown

The receptacle 1 is non-circular in cross-section perpendicular to the insertion direction r, with the x-axis of symmetry running transversely to the largest dimension b of this cross-section. As shown in FIG. 1, the drawer 1 consists essentially of two successive parts. Firstly, it is the plug-in part A which has a dividing y-axis extending transversely to the x-axis, by which the cross-section of the drawer 1 is divided into upper and lower regions having different planar dimensions. The second connection part B of the socket 1, which is connected to its plug part A, serves to connect the power cord 2. The connection part B is provided with a conventional securing of the power cord 2 against pulling out, which is not shown. The connecting part B has the shape of a truncated pyramid and is provided with ribs 4 on its surface for easier gripping.

The cross-section of the plug portion A of the drawer 1 is defined above and below the dividing axis y by convex arcs K1 and K2, both convex arcs K1 and K2 being substantially circular arc segments. Convex arc Kl. which extends above the dividing axis y, is curved slightly less than the convex arc K2 running below the dividing axis y, which means that the radius of the upper convex arc K1 is greater than the radius of the lower convex arc K2. In the transition regions U between these convex arcs K1 and K2, the cross-section of the drawer 1 is defined by arcs of smaller radius. The dividing axis y lies at the junction of these transition regions U.

As further evident from FIG. 1, two flat pin receptacles 12 and a round pin receptacle 15 are embedded in the front side 5 of the receptacle 1. The flat pin receptacles 6 have substantially rectangular cross-sections with longer sides extending parallel to the dividing axis y. In relation to the x-axis of symmetry, these flat pin receptacles 6 are arranged symmetrically, but asymmetrically with respect to the y-axis, i.e. they are displaced towards the more curved lower convex arc K2. Thus, the dividing axis y does not pass through the center cross section of the plug portion A of the drawer 1.

The round pin receptacle 7 is arranged in this cross-section between the flat pin receptacles 6 and has a circular cross-section. The socket 7 for the round pin 15 is arranged such that the axis of symmetry of the socket 7 for the round pin 15 coincides with the x-axis of symmetry of the drawer 1 and extends perpendicularly to the axis of symmetry of the socket 7 for the round pin 15 almost exactly at the height of the lower edges. Beds 6 for flat pins 12.

According to FIG. 3, electrically conductive clamping sleeves 8, to which the individual conductors of the power supply cord 2 are connected at the rear. The receptacle 7 for the round plug 15 is designed as a blind bed in the embodiment shown, i.e. it is not electrically conductive, because in this embodiment no protective conductor is used. However, in the embodiment of the protective conductor socket 1, a correspondingly formed clamping sleeve can be arranged in the socket 7 for the round pin 15, which then constitutes a protective contact.

In FIG. 2 shows the plug 9 of the electric apparatus 10, which is embedded in this only schematically indicated electric apparatus 10. This plug 9 of the electric apparatus 10 comprises a fork seat U ⁱⁿ which the flat pins 12, which represent the contact pins, protrude freely.

The fork 9 of the electrical apparatus 10 consists essentially of a housing 13 and a recessed fork portion 14 in this housing 13. This fork portion 14 is recessed relative to the front edge of the housing 13 which faces the outer wall of the electrical apparatus 10 so that there is free space in front of the fork portion 14. The aforementioned fork bed 11 protrudes into this free space, which are arranged on the fork part 14. The length of these flat pins 12 is less than the depth of the fork bed H measured in the same direction. the conductive and in the rear region of the fork portion 14 are connected to respective electrical leads which, within the electrical apparatus 10, lead to an electric motor or the like.

As can be seen in particular from FIG. 2, the plug 9 of the electrical apparatus 10, in particular its housing 13, has a cross section corresponding to that of the socket 1. The inner walls of the housing 13 correspond to the circumference of the socket 1. The corresponding radii and clear dimensions of the housing 13 are slightly larger than the corresponding radii and outer dimensions of the socket 1. so that the drawer 1 can be easily inserted into the fork receptacle 11.

Also, in the case of the fork 9 of the electric apparatus 10, its cross-section consists of convex arcs K3 and K4 above and below the dividing axis. The upper cross-sectional area is defined by the convex arc K3, while the lower area is delimited by the convex arc K4. Also in this case, the radius of the upper convex arc K3 is greater than the radius of the lower convex arc K4.

Furthermore, it is apparent that both the socket 1 and the plug 9 of the electrical apparatus 10 have a dimension between the transition regions U markedly larger than the perpendicular largest cross-section dimension c.

The aforementioned flat pins 12 are arranged in the fork receptacle 11 such that when the plug 1 is inserted into the fork receptacle 11, these flat pins 12 are inserted into the receptacles 6 for these flat pins 12 and into the clamping cavities 8 contained in these receptacles 6, electrical contact is reached. This is evident from FIG. 4. From this FIG. 4 it is also evident that in the insertion direction r the length of the plug part A of the receptacle 1 corresponds in the same direction to the measured depth of the fork receptacle 11, so that after insertion of the receptacle 1 into the plug 9 of the electrical apparatus 10 only the other functions of both these parts A and B of the drawer 1 result from the plug-in part. The plug-in part A represents the actual connecting region which serves to reach the plug-in connection. The connection portion B serves as a handling area in which the socket 1 can be gripped and thus inserted into or pulled out of the plug 9 of the electrical apparatus 10.

If a receptacle and a plug with a protective conductor are desired, receptacle X, as already mentioned, is provided in its receptacle 7 for a round pin 15 with a corresponding clamping tube. The fork bed 11 is then provided with a correspondingly oriented and produced round pin 15, which is shown in FIG. 2 to 4, shown in dotted lines.

In FIG. 5 to 10, a second embodiment of the socket 1, which can be connected to a second embodiment of the plug 9 of the electrical apparatus 10 shown in FIG. 11 and 12. This coupled state is shown in FIG. 13th

The receptacle 1 in the second embodiment has a cross-section in its plug-in portion A which corresponds in its outline to the cross-section of the first embodiment. Here, too, there is a cross-sectional area above the dividing axis y which is defined by the convex arc K1. The cross-sectional area located below the y-axis is defined by another convex arc K2 with a different radius. Here, the radius R1 of the upper convex arc K1 is also greater than the radius R2 of the lower convex arc K2.

In the illustrated embodiment, the radius R1 of the upper convex arc K1 is approximately 50 mm and the radius R2 of the lower convex arc K2 is approximately 37 mm - see FIG. 6. The transition regions U between the convex arcs K1 and K2 also have the shape of circular arc sections.

The geometric conditions M also indicate that the geometric center M1 of the convex arc K1 is located outside the cross-sectional area of the drawer 1, while the geometric center M2 of the convex arc K2 is located inside the cross-sectional area. The two geometric centers M1 and M2 are located on the x-axis of symmetry.

The unsymmetrical embodiment of the cross-section relative to the y-axis, which is perpendicular to the x-axis of symmetry, implies that the center of gravity F of the cross-sectional area does not coincide with the intersection of the x-axis of symmetry with the y-axis. In practice, this center of gravity F is shown in FIG. 6 is located below the dividing axis y, that is, it is shifted towards the more pronounced curved lower convex arc K2.

It follows from the geometrical conditions described that the width to height ratio of the drawer 1 is approximately 17: 10. In the present embodiment, the cross-sectional dimension b between the two transition regions U is approximately 34 mm and the maximum dimension c is approximately 20 mm. mm.

As further evident from FIG. 8, the dimensions of the plug portion A of the socket I are chosen such that the length a of the plug portion A approximately corresponds to the width b of the cross-section of the plug portion A.

Unlike the first embodiment, the front plane of the receptacles 6 for the flat pins 12 is not in the plane of the front side 5 of the drawer 1, but is displaced rearward in the insertion direction r. This creates a cavity 16 which is outwardly defined by the outer wall of the drawer. The depth of this cavity 16 is approximately 5 mm in the illustrated embodiment. The flat pin receptacles 6 open into the bottom of this cavity 16 and have a rectangular cross-section. Unlike the first embodiment, these rectangular cross-sections are oriented so that their longer sides are parallel to the x-axis of symmetry, the length to width ratio of these rectangular cross-sections being approximately 15: 10, i.e. approximately 8.5 to 5.5 mm. In the direction parallel to the dividing axis y, the spacing of the beds 6 for the flat pins 12 is approximately 9 mm, the beds 6 being arranged symmetrically with respect to the x-axis of symmetry.

As shown in FIG. 6, the flat pin receptacles 6 are arranged asymmetrically with respect to the dividing axis y, i.e., they are displaced towards the cross-sectional area defined by the more curved convex rounded chamber K2, such that the line of the two flat pin receptacles 6 is parallel to the dividing axis y, passes approximately through the center of gravity F of the cross-sectional area of drawer 1.

In the receptacles 6 for the flat pins 12, clamping sleeves 8 are fastened at a distance of approximately 9 mm from the bottom 17 of the cavity 16. As already mentioned in connection with the first embodiment, the receptacle 7 for the rounded pin 15 can also be provided. however, in the cross-section of the drawer 1 it is located between these receptacles 6 for the flat pins 12. However, in the illustrated embodiment, the receptacle 7 for the round pin 15 is electrically non-conductive, i.e. designed as a blind bed. Also, this ball pin receptacle 7 opens into the bottom 17 of the cavity 16, which is displaced backwards towards the front side 5 of the drawer 1.

The receptacle 1 according to the second embodiment is additionally provided with a snap-in thumb 18 extending from the periphery of its plug portion A. This snap-in thumb 18 is resilient in a direction perpendicular to the longitudinal direction of the bed 6 for the flat pins 12. The snap-in thumb 18 is specifically arranged such that located on the outside of the plug portion A of the socket 1, which is delimited by the upper convex arc K1, symmetrically with respect to the receptacles 6 for the flat pins 12. The position of the latch thumb 18 is further selected such that the latch thumb 18 is approximately midway part A of the drawer L

This snap-in thumb 18 is spring-loaded by a compression spring 19 which is arranged in the plug-in portion A of the drawer 1 so that the snap-in thumb 18 can be fully pushed into the outside surface of the plug-in portion A.

The arrangement of the snap-in thumb 18 on the upper side of the plug-in portion A of the drawer 1 and its approximately central location on this side gives the ergonomic advantage that the snap-in thumb 18 can be compressed with the thumb of the hand.

In FIG. 11 and 12, a second embodiment of the fork 9 of the electrical apparatus 10 is shown. Also, this fork 9 consists essentially of a housing 13 and a fork portion 14.

In contrast to the first exemplary embodiment, there is a free protruding padding extension 20 on the fork portion 14 in the insertion direction r, on which the tabs 21 for the flat pins 12 are again arranged.

The inner walls of the housing 13 also correspond in this exemplary embodiment to the cross-section and dimensions of the drawer 1. The radius R3 of the upper convex arc K3 in FIG. 11 corresponds essentially to the radius R1 and the radius R4 of the lower convex arc K4 corresponds substantially to the radius R2 of the drawer 1. Also here, the dividing axis, which is perpendicular to the x-axis of symmetry, passes through transition regions between the two convex arcs K3 and K4.

Said padding 20 has the same geometric proportions, but on a reduced scale, so that between the padding 20 and the inner walls of the housing 13 there is an annular groove having an approximately constant width over the entire circumference. The cross-sectional dimensions of the filling extension 20 correspond to the dimensions of the cavity 16 of the receptacle 1 in the second embodiment, so that after insertion of the receptacle 1 into the fork receptacle 11 the filling extension 20 is fully inserted into the cavity 16.

The flat pin receptacles 21 are electrically nonconductive and have rectangular cross-sections adapted to the flat pin receptacles 6. Flat pins 12 extend from the fronts of these brackets 21. In the transition region between the bracket 21 and the flat pin 12, a shaped portion 21 is formed. a centering protrusion 22 which, when the drawer 1 is inserted for centering the flat pin 12, fits into a corresponding recess 23 in a partition 24 arranged between the flat pin receptacle 6 and the clamping sleeve 8.

The length of the tabs 21 measured in the insertion direction r corresponds approximately to the distance between the bottom 17 of the cavity 16 in the drawer 1 and the clamping cavities 8.

The housing 13 of the plug 9 of the electrical apparatus 10 is provided with a leading chamfer 25 on the insertion side, which presses the snap-in thumb 18 against the compression spring 19 when the drawer 1 is inserted.

When the drawer 1 of FIG. 13 is located in the bore 26 in the housing 13 of the plug 9 of the electrical apparatus 10. The snap-in thumb 18, which is pushed into the bore 26 by the compression spring 19, prevents the socket 1 from being accidentally pulled out of the plug 9 of the electrical apparatus 10.

The disconnection of the described connection of the socket 1 with the plug 9 of the electrical apparatus 10 is only possible consciously in this embodiment. For this purpose, the plug 9 of the electric apparatus 10 is provided with a push-button 27 which is formed on the plug side of the housing 13 in the region of its upper side, which is defined by the less curved upper convex arc K3. For this purpose, a recess 28 is provided in the electrical apparatus 10 for the fork 9, which enables the actuation of said button 27. The transition region between the housing 13 and the button 27 is designed in a one-piece design to be resilient. On the inside, the button 27 is shaped downwardly, i.e. towards the bore 26 of the sleeve 13, and the disengaged thumb 29 is oriented.

When the plug J is disconnected from the plug 9 of the electrical apparatus 10, the push-button 27 is depressed so that the push-button 27 is lowered together with the disconnecting thumb 29. The free end of the uncoupling thumb 29 presses the snap-in thumb 18 against the action of the compression spring 19 downwards, so that the snap-in thumb 18 is thus pushed out of the bore 26 in the housing 13. Then it is possible to pull the socket 1 out of the plug 9 of the electrical apparatus 10.

This embodiment of the anti-pull-out device is particularly desirable for electrical apparatuses 10 which move during use, for example dust extractors, electric lawn mowers or the like. If a socket connection is used without such a locking device, the socket 1 may be unintentionally pulled out during operation, which is undesirable for safety reasons.

In FIG. 14 to 16 show the socket 1 in the second embodiment in connection with the plug 9 of the electrical apparatus 10 in the third embodiment. This fork 9 differs from the above described forks 9 in that no padding attachment 20 is used. The tabs 21 of the flat pins 12 are instead arranged directly on the fork portion 14 of the fork 9. These tabs 21 are extended by the length of the padding attachment 20. so that after inserting the socket 1 into this plug 9 of the electrical apparatus 10 according to FIG. 16, the same ratios as in the above-described embodiment of FIG. 13. Here, however, the socket 1 bears on the fork part 14 of the fork 9 only by its front side 5, which, in relation to the embodiment of the cavity 16, has only a rim shape.

In FIG. 17 to 19, another third embodiment of the drawer 1 is shown. This third embodiment differs from the second embodiment in the design of the spring-loaded snap-in thumb 18. No compression spring is used to press the snap-in thumb 18. Instead, a solution consisting of in that the snap-in thumb 18 is provided with a resilient arm 30 which is loosely cut out in the housing of the plug portion A of the drawer 1. The snap-in thumb 18 is formed directly on the resilient arm 30. The resilient deflection of the resilient arm 30 with the snap-in thumb 18 in the direction of compression the snap-in thumb 18 is allowed by the free space 31 below this spring arm 30.

The socket 1 is further provided with an actuating pin 32 having a circular cross-section, fixed in the bottom 17 of the cavity 16 and extending over the front side 5 of the drawer J. The actuating pin 32 is arranged in the cross section of the plug portion A of the socket 1 pins 12 approximately at the intersection of the x-axis of symmetry with the y-axis. By means of this control pin 32, a switch or the like can be operated, which can be arranged in the region of the fork portion 14 of the fork 9 and can serve to send a pulse or to switch on or off various electrical or electronic circuits.

All the features described are important to the invention. The scope of the present invention is also intended to fully encompass the contents of the respective priority applications, the features of which co-determine the scope of the claims of this application.

Claims (9)

PATENT CLAIMS An electrical appliance receptacle having at least two receptacles for flat pins, the receptacle being non-circular in cross-section perpendicular to the insertion direction and symmetrical with respect to an axis of symmetry extending transversely to / larger transverse dimension of said receptacle, transversely to axis (x) the symmetry extends along the dividing axis (s) and the cross-section of the drawer (1) above and below this dividing axis (y) is defined by mvex arcs (ΚΙ, K2), the two convex arcs (ΚΙ, K2) having essentially the shape of and have different radii (R1, R2). Socket according to claim 1 or particularly according to this claim, characterized in that the cross-sectional dimension (b) of the socket (1) between the transition regions (U) connecting different convex arcs ((, K2) to each other is markedly larger than perpendicular thereto. the largest dimension (c) of this cross-section. Socket according to one or more of the preceding claims or in particular according to these claims, characterized in that the receptacles (6) for the flat pins (12) are arranged asymmetrically with respect to the dividing axis (y) between the transition regions (U). to the cross-sectional area delimited by my more curved convex arc (K2). Socket according to one or more of the preceding claims or in particular according to these claims, characterized in that it is provided with a snap-in thumb (18) protruding from its circumference, which is spring-loaded perpendicular to the longitudinal direction of the beds (6) for flat pins (12). ). Socket according to one or more of the preceding claims or in particular according to these claims, characterized in that the snap-in thumb (18) is arranged on the less curved outer side of the drawer (1). Socket according to one or more of the preceding claims or in particular according to these claims, characterized in that the snap-in finger (18) is arranged approximately midway between the receptacles (6) for the flat pins (12). Socket according to one or more of the preceding claims or in particular according to these claims, characterized in that in the cross-section of the drawer (1) there is a socket (7) for the round pin (15) between the receptacles (6) for the flat pins (12). . Socket according to one or more of the preceding claims or in particular according to these claims, characterized in that, in the embodiment of the socket (1) without protective contact, the receptacle (7) for the round pin (15) is non-conductive. 9. A plug for an electrical appliance with a fork-type receptacle and a receptacle adapted thereto, the fork-type receptacle and the receptacle being non-circular in cross-section perpendicular to the insertion direction and symmetrical to the axis of symmetry extending across the largest dimension of this cross-section; ¹ , x) the symmetry extends along the dividing axis (y, y) and the cross-sectional areas above and below this dividing axis (y, y) are delimited by convex arcs (K3, K4; ΚΙ, K2), both convex arcs (K3, K4; K1, K2) have essentially the shape of segments of circular arcs with different radii (R3, R4; R1, R2).