CZ300276B6 - Terminal for electric appliances, particularly circuit breakers - Google Patents

Abstract

The present invention relates to a terminal for electric appliances, particularly circuit breakers consisting of a flange (1) shaped to the form of an open yoke comprising an upper arm (2), a web (3) and a lower arm (4), prolonged by an arbitrary molded projection (5) for connection of an electrically conduction track inside the electric appliance, wherein said flange (1) lower arm (4) is enclosed by a closed yoke (6) having the form of a frame the upper portion of which is coupled by a thread with a compression bolt (7) passing freely through a hole in the flange (1) upper arm (2), wherein at least in the base shell (11) of the electric appliance housing there is performed at least one longitudinal guide groove (15), or a side guide for sliding but friction guide of side plates (14) of the closed yoke (6), wherein at least one rounded-off projection (14) is performed on at least one side plate (14) of the closed yoke (6) for ensuring the friction contact. Said rounded-off projection (14) serves at the same time as a suspension of a plastic cover part (18) provided with springing arms (20) with holes (22) for engagement with said at least one rounded-off projection (16), wherein at least one of the springing arms (20) is provided in its corner region with springing or deformable projection (23) ensuring friction contact with the bottom of at least one longitudinal guide groove (15) in the base shell (11) of the electric apparatus housing for longitudinal guidance of the terminal closed yoke (6). In order to stabilize achieved positions of the terminal closed yoke (6), there are performed in said longitudinal guide groove (15) transverse projections (17) for friction but jump contact with the rounded-off projection (16) on at least one of the side plates (14) of the closed yoke (6), or with the projection (23) on the cover part (18).

Description

Technical field

BACKGROUND OF THE INVENTION The invention relates to a connection terminal for electrical devices, in particular circuit breakers.

BACKGROUND OF THE INVENTION Casting

Connection terminals are known to be built into electrical appliance housings, such as circuit breakers, circuit breakers, etc. The purpose of the connection terminals is to firmly and electrically conduct the grip of the electrical conductor ends in the electrical housing, to be universal for a wide range of electrical conductors used. electrical equipment needed range i? protection against accidental contact. At present, further requirements are placed on the connection terminals, namely that in their movable parts they can be adjusted in advance with respect to the different cross-sections of the electrical conductors to be used and to remain in these positions and thereby opening them forwardly to form tighter guide holes for easier insertion of the exposed electrical ends. In connection with this requirement, however, mechanical and insulating protection of those parts of the terminal clamp system which, after these terminal clamp adjustments, remain exposed from the connection sides of the electrical apparatus and create various joints into which the electric conductors could be inserted accidentally must be addressed. In addition, the connection terminals must be adapted to fasten the electrical conductors which electrically connect the respective poles of a series of electrical devices arranged side by side. especially in switchboard2? etc.

Solutions are known for spatially displaceable movable portions of connection terminals, in which flat springs are arranged in the body of the electrical apparatus as a rule longitudinally with the movable bracket of the terminal, which laterally press said movable brackets against the walls in the base shell or housing. The disadvantage of these solutions is. They do not make it possible to design the connection terminal with additional protection against dangerous contact together with covering the joints.

Some solutions include different braking elements, such as various shear pins formed in the base shell of the electrical apparatus housing, which are cut off when the movable yoke is first forced to move and then moved along with friction to the bottom of the corresponding groove formed in the base shell of the electrical apparatus. .

SUMMARY OF THE INVENTION

It is an object of the present invention to overcome these disadvantages of known connection terminals and clamp assemblies, to solve the positioning of their moving parts and to provide electrical insulation against dangerous contact, and to achieve this with a connection terminal for electrical machines, in particular circuit breakers. a bracket comprising an upper arm, a web and a lower arm, extended by an arbitrarily shaped protrusion to connect a subsequent electrical track in the interior of the electrical apparatus, the lower arm of the flange being encircled by a closed bracket in the form of a frame; passing through an opening in the upper arm of the flange, at least

5 (at least one longitudinal guide groove or a lateral guide for sliding but frictional guidance of the sides of the closed yoke is formed in the base shell of the electrical apparatus housing, for this frictional contact at least one rounded projection is formed on at least one side of the closed yoke may serve as a hinge of a plastic cover member provided with spring-loaded openings for engagement with said at least one rounded projection, wherein

- i CZ. 300276 B6 at least one of the spring arms is provided at its corner with a resilient or deformable projection for frictional contact with the bottom of the at least one longitudinal groove in the housing shell of the electrical apparatus for longitudinally guiding the closed yoke of the terminal clamp.

In order to stabilize the positions of the closed yoke of the terminal clamp, it is advantageous according to the invention that transverse protrusions are formed in the longitudinal guide groove for the frictional but stepped stub with a rounded protrusion on at least one of the sides of the closed yoke. however, the step contact with the rounded protrusion on at least one of the sides of the closed yoke, wherein the transverse protrusions or ridges of the transverse waves may also be arranged obliquely with respect to its longitudinal axis in the guide groove.

The cover member may advantageously be provided with at least one portion formed in the form of a lower face, provided as a sliding aperture in an opening in at least the base shell under the bottom of the closed yoke, which may be modified according to the invention the end of the caliper will be clamped under the closed caliper of the placed accordion tape made of plastic with shape memory etc.

Overview of the drawings

2 (1

Further advantages and effects of the present invention are further evident from the accompanying drawing, where:

Fig. 1 is a side view of the basic design of the terminal clamp showing the location of the rounded projection on the side of the closed yoke; Fig. 2 an oblique view of the basic embodiment of the terminal clamp according to Fig. 1; 4 shows an oblique view of a modified embodiment of the connection clamp according to FIG. 3;

5 shows the arrangement of the connection terminal in the base shell of the housing of the electrical apparatus with a longitudinal groove or a longitudinal groove, respectively. lateral guides for slidingly guiding the closed yoke of the terminal clamp and showing one transverse protrusion formed at the bottom of the longitudinal groove to cooperate with rounded protrusions on the sides of the closed yoke, or with resilient or deformable protrusions in the corners of the flexible arms of the plastic cover.

io

DETAILED DESCRIPTION OF THE INVENTION

According to the invention, the connection clamp consists of a flange 1 formed into an open calliper comprising an upper arm 2, a web 3 and a lower arm 4. The lower arm 4 is extended by a protrusion 5, optionally formed, to connect e.g. a conductor cable (not shown). or other similar parts from the electrical paths of the electrical apparatus (Fig. 1.2). The lower arm 4 is encircled by a closed yoke 6 in the form of a frame, the upper part of which is threadedly connected to a stiffening screw 7, which freely passes through an opening in the upper arm 2 of the flange 1. and together form a clamping point f0 for the gripped ends of a conductor (not shown) or an electrical conductor. The open bracket 1 of the flange 1 is fixed in the electrical apparatus in a system for unspecified grooves or projections (FIG. 5) formed at least in the base shell U of the electrical apparatus. Also for the head 12 of the pressure screw 7, a corresponding recess is provided in the base shell ff - as well as in the cover (not shown) and not further marked.

->

cut-outs for sliding an electro-conductive comb element under said head 11 of the fastening screw 7 and the upper wall of the upper arm 2 of the belt J. From the sides of the electric device opposite the clamping point 10 is formed at least in the base shell 11 connection terminals.

At least one longitudinal guide groove 11 and / or a longitudinal guide groove 11 is provided in the base shell 11 for sliding guide 14 of the closed yoke 6 at least. lateral guidance. After the electrical apparatus has been completely assembled, i.e. after the second shell (not shown) has been tilted, the sides 14 of the closed yoke 6 are guided in this at least one longitudinal guide groove 15 with a certain passive rest.

According to one embodiment, this effect is achieved by providing a rounded projection 6 on at least one of the sides 14 of the closed yoke 6. which, after said connection of the two base shells 11 of the electrical apparatus, gets into frictional engagement with the surface of at least i? one of the longitudinal guide grooves 11. The rounded projection 16, when moving the closed yoke 6, appropriately displaces its own track in said area of the longitudinal guide groove 15. In this track, the closed yoke 6 is not able to return by itself. It therefore remains in the position to which it has been moved away from the pressure screw 7 by a suitable force.

A similar effect can be achieved according to another embodiment, wherein one of the longitudinal guide grooves 15 will be provided with a zigzag groove (not shown) or a corrugated groove (not shown) on its bottom in the longitudinal direction. The rounded projection 11 on at least one of the sides 14 of the closed yoke 6 will act as previously described, but once it engages one of the angled portions of the zigzag or s-groove, it will be more stable in the position achieved, almost no longer able to return without some violence. at the same time, it will not expand the shells of the housing of the electrical apparatus.

The variant according to which at least one of the longitudinal guide grooves 15 is provided with a plurality of superimposed transverse projections 11 appears to be very progressive. The rounded protrusion 16 on at least one of the sides 11 of the closed yoke 6, depending on the tightening of the closed yoke 6 by the stiffening screw 7, will partially compress said transverse protrusions 11 and 14 respectively. is to skip, and with these, although partially embossed or purely skipped transverse projections 11. is then retained together with the closed yoke 6 in the achieved position and against retraction. The transverse projections 11 in the longitudinal guide grooves 11 are preferably rounded and can be offset relative to one another in the opposing base shells 11 of the electrical apparatus, whereby the displacements of the closed yoke 6 can be appropriately minimized or differentiated, or otherwise adjusted with respect to the cross sections to be considered. the electrical wires to be connected for that type of electrical apparatus. The transverse projections 11 in the longitudinal guide grooves 15 can be replaced, for example, by the undulating surface (not shown) of the bottom of these longitudinal guide grooves 11. Furthermore, the transverse projections 11 may be disposed not perpendicularly to the longitudinal axis of the longitudinal guide groove 11. This means that the rounded protrusion 16, which should be returned together with the closed yoke 6, will not find its previously possibly embossed track in the transverse protrusion 17, but will partially slide away from the oblique transverse protrusion 17 and only with additional appropriate force in it squeezes out a new new footprint or a transverse projection

JJ just jumps.

3, 4, according to another embodiment, is provided with a cover member 11 consisting of a base 19 with two spring arms 20 and a bottom face 21 connected thereto. The cover panel 11 is made of plastic. The base 19 closes to the bottom of the closed yoke 6. In this position, the cover member 11 is held by a rounded protrusion 16 on at least one of the sides 14 of the closed yoke 6 which penetrates into an opening 22 formed on each of the spring arms 20. Here, the closed yoke 6 has the function of holding and pulling elements for the cover member 11 which, together with the closed yoke 6, is displaced, even if the biid protrusions from the apertures 22 partially protrude, they can function as described above. When the closed yoke 6 is moved together with the cover member 18, the bottom member 28 of the cover member also moves, which in turn shields the opening 13 below the terminal 10 of its connection terminal, preventing the insertion of the end of the electrical conductor (not shown). contact with the live parts of the electrical apparatus. Said lower forehead 2 it may be flexible, for example formed as an accordion strip (not shown), guided on the sides and spontaneously expandable longitudinally due to its shape memory and the like.

At least one of the spring arms 20 is provided at the corner of its free end with a resilient or deflectable protrusion 23 which comes into contact with the bottom of at least one longitudinal guide groove 5 in the base shell 14 of the electrical housing for guiding the closed yoke. By friction of the projection 23 on said bottom of the at least one longitudinal guide groove 15, sc, the closed yoke 6 positions the connection terminal. The resilient or deformable projection 23 may also, as discussed above, interact with the transverse projections 11 in the longitudinal guide groove 15, optionally with its undulating or grooved surface or the like.

Claims (5)

2d PATENT CLAIMS 1. The terminal for electrical devices, in particular circuit breakers, consists of a flange (I) shaped into an open calliper comprising an upper arm (2). web (3) and lower arm (4). pro25 drawn by any shaped protrusion (5) for connecting a connecting electric track in the interior of the electrical apparatus, the lower arm (4) of the flange (1) being encircled by a closed yoke (6) in the form of a frame. (7), which freely passes through an opening in the upper arm (2) of the flange (1). wherein at least one longitudinal guide groove (15), 50 or a lateral guide for the sliding but frictional guide of the sides (14) of the closed yoke (6) is formed at least in the base shell (11) of the housing of the electric apparatus. characterized in that at least one rounded projection (16) is formed on the at least one side (14) of the closed yoke (6) for frictional contact. Connection terminal according to claim 1, characterized in that. that in the longitudinal guide In the groove (15), transverse protrusions (17) are formed for frictional but abutting contact with the rounded protrusion (16) on at least one of the sides (14) of the closed yoke (6). Connection terminal according to Claim 1, characterized in that. wherein a corrugated surface is formed in the longitudinal guide groove (15) for frictional but step contact with a rounded projection 4o (16) on at least one of the sides (14) of the closed yoke (6), - 4 GB 300276 B6 A terminal according to claim 5, characterized in that the cover panel (18) has at least one part formed in the form of a lower face (21). provided as a sliding aperture of the opening (13) in at least the base shell (11) below the bottom of the closed yoke (6). Connection terminal according to Claims 2 and 3, characterized in that the transverse projections (17) or transverse wave ridges are arranged obliquely in the longitudinal guide groove (15) with respect to its longitudinal axis. Connection terminal according to Claim 1, characterized in that in the hinge, by means of rounded projections (16). a cover (18) of plastic is provided on the closed yoke (6), provided with spring arms (20) with openings (22) for penetrating rounded projections (16), at least one of the spring arms (20) being provided at its corner a spring or deformable projection (23) for frictional contact with the bottom of at least one longitudinal guide groove (15) in the base shell (II) of the housing of the electrical apparatus for longitudinally guiding the closed yoke (6) of the connection terminal, Connection terminal according to claims 1 and 6. 2. The method according to claim 1, characterized in that an end of the bellows (6) of the molded polycarbonate with a shape memory is placed at the bottom of the closed yoke (6).