JP2006518086A - Connection terminal device for connecting link cable shoe and related electric device - Google Patents

Abstract

In particular, there is provided a connection terminal device (1) for an electric device (3) which can be clamped easily in terms of operation technology, and can be easily constructed particularly for an electric conductor (14) terminated by a ring cable shoe (13). The The connection terminal device (1) includes a connection piece (4), a clamp frame (7) surrounding the connection piece (4), and a clamp screw (9). The clamping frame (7) is clamped so that the clamping frame (7) can be displaced relative to the connection piece (4) by rotation of the clamping screw (9) to establish a clamping connection of the electrical conductor (14). A screw hole (8) cooperating with (9) is provided. The connection piece (4) protrudes in the direction of the clamp surface (17) located on the opposite side of the screw hole (8) of the clamp frame (7), and in the closed position of the connection terminal device (1), the clamp surface ( A holding projection (15) is provided which is inserted into the corresponding opening (18) of 17) and is located away from the clamping surface (17) in the open position of the connection terminal device (1).

Description

  The invention comprises a connecting piece, a clamping frame surrounding the connecting piece, and a clamping screw, in particular for connecting an electrical conductor terminated by a ring cable shoe, the clamping frame comprising a clamping connection of the electric conductor to the connecting piece. The present invention relates to a connection terminal device for an electric device, which has a screw hole that cooperates with the clamp screw so that the clamp frame can be displaced by the rotation of the clamp screw to establish the above. The invention further relates to an electrical device comprising such a connection terminal device.

  In order to connect an electric conductor to an electric device, screw terminals are widely used as connection terminal devices in the field of electric connection technology. In the conventional basic form of the same technology, a screw terminal is provided with a clamp screw that is screwed into a screw hole of a connection piece. An electric conductor to be terminated is clamped between the screw head of the clamp screw and the connecting piece.

  A special form of a screw-type clamp having at least a substantially square closed clamp frame and having a screw hole corresponding to the clamp screw formed in its periphery is called a frame-type clamp. In that case, there are two ways, one is the clamp frame being fixed to the housing and the clamping screw axially relative to the housing, for example in a frame-type clamp known from German Utility Model No. 2950608609 And screwed into the clamp frame to form a clamp connection. The other is, for example, as disclosed in German Patent Application No. 3230408, in which a clamping screw is fixed axially to the housing and attached to the housing, protruding into the clamping frame. On the other hand, the clamp screw is displaced.

  When using flexible electrical conductors, especially stranded wires, to prevent the woven fabric at the ends of the stranded conductors from fraying, i.e. to ensure good contact without defects between the conductor and the electrical device, The conductor end is usually terminated first by a so-called cable shoe. The cable shoe is further clamped to the electrical device. A general shape of the cable shoe is a so-called ring cable shoe. The ring cable shoe includes a terminal piece formed in a ring shape at its free end and having a screw hole. In the conventional screw clamp, this end piece is fixed in the form of a washer inserted under the clamp screw. The use of a ring cable shoe ensures that the electrical conductors are securely held without being lost to the connection terminal device even when the clamp screw is loosely attached due to the end piece surrounding the clamp screw in a ring shape Is convenient in the sense of.

  In order to be able to clamp the ring cable shoe to a conventional threaded clamp, the clamping screw must necessarily be loosened and the clamping screw must be completely removed from the corresponding screw hole in the connecting piece. However, in the conventional screw clamp, the clamp screw is simply held in the screw hole. Therefore, after the clamp screw is extracted, the clamp screw remains extracted. As a result, the clamp connection of the ring cable shoe leads to a relatively expensive manual operation. In that case, when the access to the connection terminal device is very difficult due to the small space in the electric device, in particular, simple operation of the connection terminal device is desired. Under these circumstances, it is often the case that the clamp screw falls off when loosening and removing the screw, and in some cases it cannot be found or reached. .

  When using a normal frame type clamp, it is possible to securely connect the ring cable shoe without having to unscrew the clamp screw completely from the screw hole of the clamp frame. However, the ring cable shoe is no longer held by the frame clamp as soon as the clamping screw is loosened, as is the case with individual ordinary conductors. Therefore, the particularly secure conductor attachment provided by the ring cable shoe does not work with the clamp connection in conventional frame clamps.

  The object of the present invention is structurally simple and allows for easy operation of clamping and unclamping of electrical conductors, particularly suitable for clamping electrical conductors terminated by ring cable shoes It is to provide a connection terminal device. It is a further object of the present invention to configure the electrical device in a structurally simple manner, in particular so as to allow a simple connection of conductors terminated by a ring cable shoe.

  With respect to the connection terminal device, this problem is solved by the configuration of claim 1. According to this, a connection terminal device according to a normal frame clamp type includes a connection piece, a clamp frame surrounding the connection piece, and a clamp screw screwed into a screw hole formed in the periphery of the clamp frame. Furthermore, in order to securely hold the ring cable shoe, it is provided with a holding projection protruding from the connecting piece in the direction of the clamping surface of the clamping frame, which holding projection is a corresponding opening in the clamping frame in the closed position of the connection terminal device. It is inserted in the shape of a pin and is located away from the clamping surface in the open position of the connection terminal device. Alternatively, the problem concerning the connection terminal device is solved by the invention according to claim 4 according to the present invention. This alternative solution is structurally contrary to the first solution, in which the holding projections are mounted on the clamping surface of the clamping frame and aligned in the direction of the connecting piece, and the connecting piece has a corresponding opening. Is formed.

  The connection terminal device according to the present invention combines the advantages of a conventional screw clamp with respect to secure holding of the ring cable shoe into the simple operation of a conventional frame clamp. In the clamping connection process, the holding protrusion penetrates the opening of the ring cable shoe inserted into the connection terminal device, thereby holding the ring cable shoe so as not to be detached from the connection terminal device. This holding system is particularly stabilized by locking the ring cable shoe to the connection terminal device like a latch by inserting the holding projection into the corresponding opening located on the opposite side. In both alternative solutions, the connection terminal device can be simply constructed structurally, in particular allowing a simple assembly which can be automated.

  Two more preferred alternative embodiments are proposed for the first solution. In that case, for one thing, the holding projection is fixed to the connecting piece, in particular by welding or pressing. In other embodiments, the retaining projection is configured as part of a clamp screw. In this embodiment, which is particularly simple in structure, a hole is formed in the connecting piece, through which the holding projection passes. By fixing the connection piece to the housing, stable and simple holding of the connection terminal device is achieved. In order to prevent possible loss of the clamping screw, it is more preferred that the clamping screw is pivotable and held in the housing. Holding such that the clamp screw is not removed can be implemented in various ways. For example, a clamping screw can be riveted to the connecting piece. In a preferred variant, the clamping screw is held in the housing by a housing projection which locks behind the screw head.

  For further simplification of the clamping connection process, the housing is preferably provided with a positioning contour for the ring cable shoe. The positioning contour includes at least a back wall. The ring cable shoe abuts against the back wall when the screw hole overlaps the opening of the clamp surface and the holding projection in the axial direction when inserted into the connection terminal device. Further optionally, the positioning contour comprises a side wall. The side wall functions as a lateral alignment of the screw hole of the ring cable shoe with respect to the opening and the holding projection.

  The object of the present invention relating to an electric device is solved by the structure of claim 8. According to this, the connection terminal device according to the invention is incorporated in an electrical device. In that case, the housing of the connection terminal device is in particular formed integrally with the housing of the electrical device.

  In that case, the connection terminal device makes it possible to easily connect the electrical device to the electrical conductor, especially even in extremely narrow working spaces. The incorporation of the connection terminal device according to the invention in an electrical device makes it possible to produce the electrical device particularly inexpensively.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings.

  In each figure, the same code | symbol is attached | subjected to the part which mutually respond | corresponds.

  FIG. 1 shows a connection terminal device 1 housed in a housing 2 showing only the main part of an electric device 3. The electrical device 3 is, for example, a protective circuit breaker.

  The connection terminal device 1 includes a connection piece 4 made of a conductive material and formed in a plate shape or a rod shape. The connecting piece 4 is fixed to the housing 2 and its free end 5 protrudes into an insertion slit 6 accessible from the outside.

  The connection terminal device 1 further comprises a clamp frame 7 in the form of a sleeve having a substantially square cross section. The clamp frame 7 is placed on the free end 5 of the connection piece 4 so as to penetrate the connection piece 4. The clamp frame 7 has a screw hole 8 formed in a wide range. The screw hole 8 engages with a clamp screw 9 guided so as to be able to rotate in the housing hole 10. The clamp screw 9 has its screw foot 11 placed on the connection piece 4. Further, in order to prevent the clamp screw 9 from coming out upward from the housing 2, a housing protrusion 12 protruding into the housing hole 10 is provided on the head side of the clamp screw 9. In this way, the clamp screw 9 is held substantially fixed in the axial direction between the connection piece 4 and the housing protrusion 12, and is thus attached so as not to be detached from the housing 2.

  The connection terminal device 1 is provided particularly for fixing the electric conductor 14 terminated at the end side by the ring cable shoe 13 so as not to come off. Therefore, the connection piece 4 includes a substantially cylindrical holding projection 15. The holding protrusion 15 is fixed to the connection piece 4, preferably by welding or press bonding, and protrudes substantially parallel to the screw axis 16 of the clamp screw 9 from the surface of the connection piece 4 opposite to the clamp screw 9. . The holding projection 15 is in particular in the region of the connection piece 4 surrounded by the clamp frame 7 and is directed to the surface of the clamp frame 7 opposite to the screw hole 8. In the following, this surface is shown as a clamping surface 17. The clamping surface 17 is provided with an opening 18 arranged coaxially with the holding projection 15 in the axial direction with respect to the screw axis 16. The opening 18 is dimensioned so that the holding projection 15 can be received with little play.

  The electric conductor 14 is preferably a flexible cable 19 made of a plurality of strands, and the end thereof is connected to the ring cable shoe 13. In the ring cable shoe 13, the shrink portion 20 facing the cable 19 is subjected to shrink processing together with the cable 19. The ring cable shoe 13 includes a flat clamp piece 21 on its free end side. The clamp piece 21 is formed with an opening 22 through which the holding projection 15 passes. Since the opening 22 has a ring-shaped closed edge, the ring cable shoe 13 is used as a name that is practically used in the connection technology.

  FIG. 1 shows the connection terminal device 1 in the open position, i.e. before the conductor 14 is clamped. In this state, the clamp screw 9 is considerably pushed out from the screw hole 8 of the clamp frame 7 but is not completely pushed out. In this position, an axial direction corresponding to at least 1 time, preferably at least 2 times the material thickness of the clamp piece 21 between the unit formed by the connection piece 4 and the holding projection 15 and the clamp surface 17 of the clamp frame 7 An interval is formed.

  In order to clamp-connect the conductor 14 to the connection terminal device 1, first, the clamp piece 21 of the ring cable shoe 13 is inserted in the insertion direction 23 between the holding projection 15 in the insertion slit 6 and the clamp surface 17 in FIG. 1. . The insertion of the ring cable shoe 13 can be easily performed by the positioning contour of the housing 2 including at least the rear wall 24 of the insertion slit 6 in the region of the insertion slit 6. The rear wall 24 is arranged so that the centering is performed so that the opening 22 overlaps at least the opening 18 when the clamp piece 21 inserted in the insertion direction 23 hits the rear wall 24.

  Furthermore, the insertion slit 6 has two side walls 25. The side wall 25 is preferably designed as part of the positioning contour so that the opening 22 is automatically centered laterally with respect to the opening 18 when the clamping piece 21 is inserted into the insertion slit 6.

  In order to fix the ring cable shoe 13 to the connection terminal device 1, a clamp screw 9 is screwed into the clamp frame 7 by an operating tool (not shown), in particular, a screwdriver. In particular, when the clamp screw 9 is screwed, the clamp frame 7 is continuously displaced in the axial direction of the clamp screw 9 with respect to the connection piece 4, and the clamp screw 9 is related to the housing 2 between the connection piece 4 and the housing protrusion 12. It is held fixed in the axial direction. At that time, the holding projection 15 passes through the opening 22 of the ring cable shoe 13 and enters the opening 18 like a hammer. In this way, the ring cable shoe 13 is held so as not to be detached from the connection terminal device 1.

  The screwing of the clamp screw 9 is continued until the clamp piece 21 of the ring cable shoe 13 is clamped between the connection piece 4 and the clamp surface 17 in FIG. This position of the connection terminal device 1 is referred to as a closed position. In this way, the conductor 14 and the electric device 3 are conductively connected to each other via the ring cable shoe 13 and the connection piece 4.

  3 and 4 show an alternative embodiment of the connection terminal device 1 in the open and closed positions. In this embodiment, the holding projection 15 is formed integrally with the clamp screw 9. The holding protrusion 15 is configured as a thin protrusion with respect to the main body 26 of the clamp screw 9, which is arranged coaxially with the main body 26 with respect to the screw axis 16 and protrudes downward from the screw foot 11. The hole 27 formed in the connection piece 4 corresponds to the holding protrusion 15, the diameter of the hole 27 corresponds to at least the diameter of the holding protrusion 15, and the diameter of the hole 27 is set smaller than the diameter of the main body 26. The holding projection 15 penetrates the hole 27 and projects downward beyond the surface of the connecting piece 4 opposite to the clamp screw 9 as described above.

  Another embodiment of the connection terminal device 1 is shown in FIGS. 5 and 6 in the open or closed position, respectively. In this embodiment, the holding protrusion 15 is attached to the clamp surface 17 and protrudes upwards substantially concentrically with the screw axis 16 in the direction of the connecting piece 4 from here.

  As shown in FIG. 6, the holding projection 15 is opened in the corresponding opening 28 of the connection piece 4, that is, the opening 28 provided substantially concentrically with the screw axis 16 in the connection piece 4 as shown in FIG. 6. Inserted. Further, a recess 29 formed in the screw foot 11 concentrically with the screw shaft 16 is provided for receiving the holding projection 15. This recess 29 in the clamping screw 9 acts as if extending the opening 28 of the connecting piece 4.

It is a longitudinal cross-sectional view of an electrical device in an open position having a connection terminal device for electrical conductors. It is a longitudinal cross-sectional view of the connection terminal device of FIG. 1 in a closed position. It is a longitudinal cross-sectional view similar to FIG. 1 which shows the alternative Example of the connection terminal device in an open position. FIG. 4 is a longitudinal sectional view of the connection terminal device of FIG. 3 in a closed position. It is the same longitudinal cross-sectional view as FIG. 1 which shows the other alternative Example of the connection terminal device in an open position. FIG. 6 is a longitudinal sectional view of the connection terminal device of FIG. 5 in a closed position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection terminal device 2 Housing 3 Electrical device 4 Connection piece 5 Free end of connection piece 6 Insertion slit 7 Clamp frame 8 Screw hole 9 Clamp screw 10 Housing hole 11 Screw foot 12 Housing protrusion 13 Ring cable shoe 14 Electric conductor 15 Holding protrusion 16 Screw shaft center 17 Clamp surface 18 Opening 19 Cable 20 Shrink part 21 Clamp piece 22 Opening 23 Insertion direction 24 Back wall 25 Side wall 26 Body 27 of clamp screw 9 Hole 28 Opening 29 Recess

Claims (8)

A connection piece (4), a clamp frame (7) surrounding the connection piece (4), and a clamp screw (9) are provided. The clamp frame (7) is provided with a screw hole (8), and the screw hole (8). The clamping screw (9) so that the clamping frame (7) can be displaced relative to the connecting piece (4) by rotation of the clamping screw (9) to establish a clamping connection of the electrical conductor (14). 9) In connection terminal device (1) for electric device (3) in cooperation with
A holding projection (15) projecting from the connection piece (4) in the direction of the clamping surface (17) located on the opposite side of the screw hole (8) of the clamp frame (7) is provided. Is inserted into the corresponding opening (18) of the clamping surface (17) in the closed position and is located away from the clamping surface (17) in the open position. Connection terminal device (1).   The connection terminal device (1) according to claim 1, wherein the holding protrusion (15) is fixed to the connection piece (4).   The connection terminal according to claim 1, wherein the holding projection (15) is attached to the clamp screw (9) and passes through a hole (27) formed in the connection piece (4). Device (1). A connection piece (4), a clamp frame (7) surrounding the connection piece (4), and a clamp screw (9) are provided. The clamp frame (7) is provided with a screw hole (8), and the screw hole (8). The clamping screw (9) so that the clamping frame (7) can be displaced relative to the connecting piece (4) by rotation of the clamping screw (9) to establish a clamping connection of the electrical conductor (14). 9) In connection terminal device (1) for electric device (3) in cooperation with
A holding projection (15) projecting in the direction of the connecting piece (4) from a clamping surface (17) located on the opposite side of the screw hole (8) of the clamp frame (7) is provided, and this holding projection (15) Is inserted into the corresponding opening (28) of the connecting piece (4) in the closed position and is located away from the connecting piece (4) in the open position. Connection terminal device (1).   The connection terminal device (1) according to any one of claims 1 to 4, wherein the connection piece (4) is fixed to the housing (2).   The connection terminal device (1) according to any one of claims 1 to 5, characterized in that the clamp screw (9) is pivotable and is held in the housing (2) so as not to be lost. ).   7. The connection terminal device according to claim 1, further comprising a positioning contour (24, 25) for a ring cable shoe (13) for terminating the conductor (14). 1).   Electrical device (3) comprising the connection terminal device (1) according to any one of claims 1 to 7.

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