EA004608B1 - Clamping auxiliary element - Google Patents

Abstract

1. A lifting clamp (1) for mounting in a housing of an electrical appliance, e.g. a circuit-breaker, comprising a rectangular frame (14) and a rectangular box (15), the upper section (150) of said box being arranged between the upper section (140) and the lower section (141) of the frame (14), enabling the box (15) to be held in the frame (14) in a displaceable manner, said lifting clamp also comprises a clamping screw (16) which is guided through an opening (142) incorporated in the upper section (140) of the frame in a freely rotatable manner, and which engages in a screw thread (152) incorporated in the upper section (150) of the box (15), said box (15) is held in the frame (14) against a resistance in a displaceable manner, characterized in that said resistance is formed by a shear pin which is fixed in the housing and preferably integral therewith and which is connected to the box(15)with a form fit. 2. The lifting clamp (1) for mounting in a housing of an electrical appliance, e.g. a circuit-breaker, comprising a rectangular frame (14) and a rectangular box (15), the upper section (150) of said box being arranged between the upper section (140) and the lower section (141) of the frame (14), enabling the box (15) to be held in the frame (14) in a displaceable manner, said lifting clamp also comprises a clamping screw (16) which is guided through an opening (142) incorporated in the upper section (140) of the frame in a freely rotatable manner, and which engages in a screw thread (152) incorporated in the upper section (150) of the box (15), and a tab (24) fixed on the box (15) extending from the lower box section (151) of the box (15) to the space inside the box (15) and extending parallel to the opening (19) in the housing near the lifting clamp (1), characterized in that a lamina (25) extending parallel to the lower box section (151) is integrally formed with the tab (24) and connects the tab (24) to the box (15). 3. The clamp according to claim 2, characterized in that a mounting plate (26) extending perpendicular to the lamina (25) as well as perpendicular to the tab (24) is formed and rigidly connected to the box (15) side wall. 4. The clamp according to claim 3, characterized in that a pin (27) is formed on the mounting plate (26) which fits into orifice (28) made in the box (15) side wall. 5. The clamp according to claim 3 or 4, characterized in that the mounting plate (26) is provided with an orifice (35) into which the shear pin, fixed in the housing, fits.

Description

The invention relates to a lifting clip for installation in the housing of an electrical device, for example, a line circuit breaker, comprising a rectangular frame and a box, the upper part of which is located between the upper and lower parts of the frame, by means of which the box is held in a frame with the possibility of movement, as well as a clamping screw, passing through the hole made in the upper part of the frame with the possibility of free rotation and which enters the thread made in the upper part of the box, the box being held in the frame with zmozhnostyu movement against resistance.

Such lifting clamps in two locations, namely between the lower parts of the frame and the box (lower receiving chamber), as well as between the upper part of the frame and the head of the clamping screw (upper receiving chamber), can be clamped with electrical wires.

When the clamping screw is rotated in the opening direction, the box moves down first, as a result of which the lower receiving chamber opens. Only after the box reaches its lowest position, in which it is adjacent to a part of the body, does the clamping screw move upwards as the opening continues, causing the upper receiving chamber to open.

When tightening the clamping screw, it must first be rotated until the lower part of the box rests on the lower part of the frame, and only then the rotational movement of the clamping screw in the closing direction is transformed into a clamping fit of the screw head to the upper part of the frame or located between this upper part and screw head electrical wire.

When using only the upper receiving chamber to open it or to clamp the electrical wire in this chamber, the clamping screw needs to be rotated very far, due to which the time spent on connecting the electrical wires to the lifting clamp is relatively large. Such a connecting clip or connecting terminal with clip boxes is known, for example, from patent application EP 0 168,596 A. Such a lifting clip is also known from patent application EP 0 905839 A.

Lifting clamps are also known in the art, in which resistance is provided against which one of the junction boxes could move, in order to reduce the time spent on connecting the electrical wires to the lifting clamps. From patent applications 19513281, 21072181 A and EP 1028489 A are known, for example, connecting or lifting clamps, in which the resistance against which the box is held in a frame with the possibility of movement, is realized by a spring. In EP 0280672 A, such resistance is realized by friction of the box on the part of the body.

The lack of technical solutions known from the prior art, is that the resistance against which the box is installed in the frame with the possibility of moving, could be overcome inadvertently, and the lower receiving chamber could open prematurely.

The present invention is to eliminate this drawback and to provide a lifting clamp of the type described above, which, when the clamping screw rotates in the opening direction, first opens the receiving chamber between the upper part of the frame and the screw head, and the lower receiving chamber remains closed for the time being. The lower receiving chamber can only be opened by taking special measures, for example, applying a greater force to the screw in order to reliably prevent the unsettled movement of the box.

According to the invention, this problem is solved due to the fact that the resistance is formed by a shear pin fixed predominantly in the body, which is made predominantly with the body, which is connected to the box with a positive fit, i. with rigid fixation.

If during the rotation of the clamping screw a large force is not applied to it, i.e. force is applied no more than is necessary to rotate the screw; this resistance at first prevents the box from moving. The movement of the screw in the direction of opening is completely transformed into raising the screw head from the top of the frame, i.e. In opening the upper receiving chamber, which allows even after a slight rotation of the clamping screw in the opening direction, insert the connecting flap of the shredder system into the upper receiving chamber and securely clamp it there due to the slight rotation of the clamping screw in the closing direction.

When overcoming resistance, i.e. by pressing on the clamping screw, the resistance can be overcome, the box is moved down, and the lower receiving chamber is opened as a result. In particular, due to the shear pin, at first, any movement of the box relative to the frame is prevented, thereby preventing an unspecified movement of the box. Moving the box and thereby opening the lower receiving chamber can occur, however, after the shear pin has been shifted.

It would also be possible to implement resistance by means of a spring placed inside the box, for example a coil spring, which applies a force to the box in the direction of the frame.

The force of the spring only slightly decreases with time or at an hour of compression, in particular, less than the rolling friction force that occurs between two adjacent parts. This embodiment of resistance has the advantage of, in particular, a longer service life compared with an embodiment based on the friction of two parts.

Resistance can also be realized by rubbing the foot against a part of the body. It is preferable that only parts included in the device are used to implement resistance, and thus, the technical costs associated with the manufacture and assembly of individual parts can be avoided.

The invention further relates to a lifting clip for installation in an electrical device case, for example, a circuit breaker containing a rectangular frame and a box, the upper part of which is located between the upper and lower parts of the frame, by means of which the box is held in the frame (14) with the possibility of moving, clamping a screw that passes through the hole made in the upper part of the frame with the possibility of free rotation and enters the thread made in the upper part of the box, as well as the thread fixed to the box KU, which extends from the bottom of the box into the space inside the box and runs parallel to the plane lying next to the lifting clip of the hole in the housing.

Such lifting clamps with pads or covers fixed on the box are known, for example, from patent applications EP 0559585 A and I8 5580285 A. A disadvantage of the technical solutions of patent application EP 0559585 A is that the foot described in the indicated source is made in one piece with the metal box and, thereby, does not form an electrically insulating protection. In patent description I8 5580285 A, on the contrary, in one embodiment, a removable cover is described. This cover is fixed on the box only with a small hook, so that the resulting small combination surface does not provide a reliable connection.

Another object of the invention is to reliably connect the foot to close the lower receiving chamber with the box.

According to the invention, this problem is solved due to the fact that a plate is formed parallel to the bottom of the box on the foot, by means of which the foot is connected to the box. The part of the hole lying under the bottom of the box is thus closed, which prevents erroneous wiring under the bottom of the box. The plate provides contact with the box over a relatively large area, thus creating a reliable connection.

In this regard, it can further be provided that the plate is formed on both the perpendicular and the perpendicular to the foot mounting plate, which is firmly connected to the side wall of the box.

In another embodiment of the invention, it may be provided that a pin is formed on the mounting plate, which is inserted into a hole made in the side wall of the box.

Thus, the box can be fixed on the mounting plate, namely, by simply putting the box on the mounting plate, which is not associated with high technical costs.

In this connection, it can further be provided that a hole is made in the mounting plate, into which a shear pin fixed in the housing enters.

Due to this location of the shear pin, it can, in addition to its main function of creating resistance against moving the box, perform an auxiliary function of holding the mounting plate, plate and foot in the body. When installing the components of the machine in the case, the mounting plate, plate and foot can be inserted into the lower part by mechanical means.

The invention is explained in more detail with reference to the accompanying drawings, which depict preferred embodiments.

FIG. 1 shows a top view of a line circuit breaker with the top removed, equipped with lifting clamps 1;

in fig. 2 is a perspective view of the lower part of the line circuit breaker according to FIG. 1 provided with only one lifting clip 1, the second lifting clip 1 being shown lying outside the bottom;

in fig. 3 is a top view of the lower part of the line circuit breaker according to FIG. 1, provided only with a right lifting clamp 1, and in the area of the left lifting clamp there is provided a tab 24 fixed on the box 15 of the lifting clamp;

in fig. 4 is a perspective view of the structure shown in FIG. 3;

FIG. 5 is a top view of a lifting clip 1 installed in the housing, according to the invention, the resistance against which the box 15 of the clamp 1 moves in the form of a spiral compression spring 32;

FIG. 6 is a top view of the structure shown in FIG. 5, while for the implementation of resistance, instead of the spiral spring 32 of compression, a shear pin 33 formed on the inner wall of the body is provided.

Depicted in FIG. 1, the linear circuit breaker comprises two screw clamps 1, made in accordance with the invention, in the form of so-called “lifting clamps”, by means of which comb-like connecting lobes of the shredding systems can be attached to the protection automat.

The circuit breaker further comprises a release 2 for protection against overloads and a release of short-circuit current 3 and a switching mechanism 4 configured to move the movable contact 5 from a closed position, in which the movable contact 5 lies against the fixed contact 8, to the one shown in FIG. 1 open position.

The monitored current flows in this circuit breaker flowing from the right screw terminal 1, first through the release 2 for protection against overloads, through the portable wire 6 and the bridge contact 7 to the moving contact 5, then through the fixed contact 8 to the short circuit release 3 and finally, to the second connection terminal 1.

The switching mechanism 4 can be initiated both by the short-circuit release 3 and by the release 2 for protection against overloads. The short-circuit release 3 is made in a known manner in the form of a magnetic coil with a movable armature, which, at correspondingly high short-circuit currents, hits the bridge contact 7 of the switching mechanism 4.

Overload protection release 2 consists of a bimetallic strip that is heated by a controlled current. The first end 21 of the bimetallic strip is fixed in the case of the circuit breaker, and the second end 22 is held movably. The bending of the latter caused by the heating of the bimetallic strip therefore leads to the movement of the second end 22 along arrow 23. With a sufficiently strong heating, the free end 22 of the bimetallic strip touches during this movement with the clamp 9 acting on the dog 36 and causes it to trigger the switch mechanism 4.

Bridge contact 7 is spring-loaded spring 10 in the direction of the open position of the movable contact 5. Explained minor deviations of the pawl 36 due to the armature of the short circuit release 3 or through the release 2 for protection against overloads through the collar 9 are reinforced by this spring 10 for full deviation of the bridge contact 7 in open position of the moving contact 5.

To turn on the safety switch, i.e. To rotate the contact holder 7 back into the closed position of the movable contact 5, a lever 11 is pressed by hand and is accessible from the outside of the circuit breaker.

The body of the protective machine is made in a known manner consisting of the lower part 12 shown in the figures and the upper part (not shown), which is structurally mirror-symmetrical lower part 12.

This invention relates to lifting clamps 1 and is not limited to the use of these lifting clamps 1 in line circuit breakers. The figures show a linear circuit breaker and its lower part 12, since this application is the preferred area of use for a lifting clamp 1 according to the invention. Despite this, it can be used in electrical devices of any type, i.e. in damage protection circuit breakers, disconnectors, stair lighting machines, etc.

The lifting clamp 1 according to the invention, as well as the screw clamps of this type known from the prior art, comprises a frame 14, which in the case of FIG. 1 position is made rectangular. It consists, as a rule, of a solid, three times bent 90 ° copper strip. This frame 14 is fixedly held in the housing, which, for example, is achieved by clamping said frame 14 between the projections on the inner wall of the lower part.

The second main part of the lifting clamp 1 is a box 15, which is also made in the form of a frame (Fig. 2). Box 15 is rotated 90 ° relative to frame 14 and is suspended therein, i.e. the upper part 150 of the box 15 lies between the upper 140 and lower 141 parts of the frame 14. The box 15 passes, thereby, in the frame 14 with the possibility of movement.

The third main part of the lifting clamp is the clamping screw 16. The upper part 140 of the frame 14 has an opening 142 through which the clamping screw 16 passes with the possibility of free rotation. In the upper part 150 of the box 15, a thread 152 is inserted, into which the clamping screw 16 is inserted. When the clamping screw 16 rotates in the closing direction (i.e., clockwise when the clamping screw 16 is in the form of a right-handed screw), the box 15 rises, i.e. . moves toward the top of the frame 140. This movement occurs because the clamping screw 16 with its lower end rests against the lower part 141 of the frame or with its head 160 into the upper part 140 of the frame. Continued screwing of the clamping screw 16 into the thread 152 of the box may not cause the clamping screw 16 to move downward, but only to lift the box 15.

When rotating the clamping screw 16 in the opening direction (i.e., counterclockwise when the clamping screw 16 is made in the form of a right-handed screw), the box 15 is lowered, i.e. moves towards the bottom of the frame 141.

Such a lifting clamp 1 has two locations where electrical wires can be attached. First, the wires can be placed in the chamber 17, lying between the lower part 141 of the frame 14 and the lower part 151 of the box 15, and, secondly, in the chamber 18, lying between the upper part 140 of the frame and the screw head 160 (FIG. 2). When tightening the clamping screw 16, both the lower parts 141, 151 of the frame 14 and the box 15, respectively, and the screw head 160 are pressed against the upper part 140 of the frame, and the wires placed in the chambers 17, 18 are clamped.

As a rule, wires are inserted into the chamber 17, lying between the lower part 141 of the frame 14 and the lower part 151 of the box 15, and the connecting lobe of the system of erratum system in the chamber 18 lying between the upper part 140 of the frame and the screw head 160. In order to keep both of these chambers 17, 18 accessible for insertion of electrical wires, holes 19, 20 are provided in the housing at the height of these chambers 17, 18.

In connection with the insertion of the wire into the lower chamber 17, a problem arises, in particular when the clip is not wide enough, i.e. the lower part 150 of the box 15 lies too close to the lower part 141 of the frame 14, which consists in the fact that this wire, however, passes through the hole 19, but then erroneously gets into the chamber 17, and under the box 15. Proper clamping, t. e. fixing the specified wire is no longer possible.

To exclude such an incorrect insertion of the wire on the box 15 is fixed foot 24, which runs perpendicular to the bottom 151 of the box 15 and extends from it, i.e. in the space under the box 15. The tab 24 runs parallel to the plane of the hole 19 and is located directly adjacent to the hole.

Due to the connection with the box 15, the tab 24 moves together with the box 15 and closes, thus, the opening 19 section lying under the box 15. The wire passed through this opening 19 can be inserted, therefore, only into the chamber 17 lying between the bottom 141 of the frame 14 and the bottom 151 of the box 15, which reliably prevents the erroneous insertion of the wire under the box 15 described above.

Foot 24 can be made constructively arbitrary. It can be made, for example, in one piece with the box 15, for example, by bending it from the same conductive tin strip as box 15. It can also be a separate part from the box 15 that is firmly connected to it, for example, welded or glued together. It can be made of an insulating material, for example, plastic, and this provides the additional advantage that the tabs 24 can be safely touched even when its clamp is under voltage, which happens when the current-carrying wire is already attached to the other clamp .

According to FIG. 1-4 an embodiment of the invention on the tab 24 is formed a plate 25 running parallel to the lower part 151 of the box 15, through which the tab 24 is connected to the box 15. The plate 25 can be for this purpose, for example, glued or welded to the lower part 151 of the box 15.

According to the embodiment of FIG. 1-4, the connection between the plate 25 and the bottom 151 of the box 15 is provided by means of the mounting plate 26, which is molded on the plate and extends perpendicularly to both this plate 25 and the tab 24. This mounting plate 26 is firmly connected to the side wall of the box 15, which, in turn, can be realized by gluing or welding these two parts.

Preferably used and therefore depicted in FIG. 1-4, the option of fixing the mounting plate 26 on the box 15 provides for a pin 27 formed on the mounting plate 26. A hole 28 is made in the side wall of the box, into which the pin 27 enters, thus fixing the mounting plate with flush and thereby the tab 24 on the box 15.

As already indicated above, the considered lifting jaw 1 has two locations, namely chambers 17, 18, for clamping electrical wires, and usually wires are inserted into the lower chamber 17, and the connecting lobe of the shredder system is inserted into the upper chamber 18.

As a rule, at the same time only one type of wire is connected to the same connection clip, i.e. either the connecting tab of the shredder system, or the wire.

When opening the clamp using the screwdriver used for this, the clamping screw 16 not only rotates, but also presses it down. With lifting clamps that have the described design features, this leads to the fact that the screw head 160 always presses against the upper part 141 of the frame 14, and the rotation of the clamping screw 16 is converted only into the movement of the box 15 downwards, i.e. the opening of the chamber 17. Only when the box 15 has completely moved down and in this position it is adjacent to the part 29 of the body lying under it, does the box 15 no longer move further down. The then opening movement of the clamping screw 16 is converted into its movement upwards, with the result that the screw head 160 rises from the upper part 140 of the frame, and the upper chamber 18 opens.

When the clamping screw 16 rotates in the closing direction, the chamber 18 first closes, then the box 15 is lifted until its lower part 151 adheres to the lower part 141 of frame 14, and only with continued rotation of the clamping screw 16 in the closing direction of its head 160 will it press against the upper frame parts 140 with clamping action.

This principle of operation stipulates that when only the connecting flap of the tying system is to be connected to the lifting clamp, you must first fully open the clamping screw 16 and, after inserting the connecting flap into the chamber 18, completely close it.

According to the invention, to eliminate this circumstance, which leads to the time-consuming installation process, it is provided that the box 15 of the lifting jaw 1 is not held in the frame 14, but is movable against resistance. Resistance can be implemented in various ways.

For example, the box 15 may fit with friction to the frame 14 or to parts of the body. The resulting friction between the box 15 and the frame 14 or parts of the housing first prevents the described movement of the box 15 relative to the frame 14, with the result that the clamping screw 16 rotates in the opening direction out of the box 15 and frame 14 when rotating in the opening direction closing enters the box 15 and the frame 14. Resistance (friction) is calculated with the possibility of overcoming it, for example, by applying pressure on the screw head 160. This allows, if necessary, immediately when rotating the clamping screw 16 to open the lower chamber 17.

In the case of FIG. 1 of the case of implementation of the housing above the screw head 160 is located an edge 30 in which a hole 31 is made. This hole 31, which serves to insert the screwdriver clamping screw 16 necessary for rotation, has a smaller diameter than the clamping screw head 16 160.

When moving the clamping screw 16 upwards, what happens when it rotates in the opening direction, when it is not pressed at the same time on the clamping screw 16, its head 160 abuts against the edge 30. While continuing to rotate the clamping screw 16 in the opening direction, since it can no longer move up, there is a pressure on the box 15 down. The resistance is overcome, and the box 15 moves down.

Resistance, as shown in FIG. 5, can be implemented by a spring 32, which pushes (strains) the box 15 in the direction of the frame 14. This spring 32 can for this purpose be formed by a leaf spring or, as shown in FIG. 5, a spiral compression spring, which is under the box 15 and at one end rests on the body part 29, and the other end through the plate 25, if any, on the lower part 151 of the box 15.

Several options for implementing resistance can be provided at the same time, for example, the box 15 can be installed with friction on the frame 14 and on the case, or in addition to installing the box with friction on the frame 14, a spring 32 can be provided.

As follows from the explanation of the functioning of the resistance, the parts indicated or necessary to ensure its resistance can be provided independently of the tab 24, i.e. even when the specified foot 24 is missing. In the presence of the tab 24, the resistance can be realized by the arrangement of this tab 24 with ensuring friction in the housing 12.

A common feature for the presented possible options for the implementation of resistance is that they constantly provide this resistance, i.e. this resistance does not significantly change when the box 15 moves.

According to a preferred embodiment of the invention, a shear pin 33 is provided, secured in the housing. The shear pin 33 is connected to the box 15 with a positive locking when it is in the position as indicated in FIGS. 1 and 6. This can be achieved, for example, by the fact that the shear pin 33 enters a hole in the side wall of the box, or by arranging the shear pin 33 directly below the bottom 151 of the box, as shown in FIG. 6

When the clamping screw 16 is rotated in the opening direction, the shear pin 33 first prevents any movement of the box 15, and the rotational movement is converted exclusively into the movement of the clamping screw 16 upwards. When a pressing force is sufficiently high on the clamping screw 16, a pressing force extending in its longitudinal direction (for example, by striking the clamping screw 16 or by further rotating the clamping screw 16, when its head 160 has already rested against the rib 30), the shear pin 33 moves, and Box 15, from now on, can move completely freely.

In this variant implementation of resistance, it manifests itself only temporarily, namely, only up to the shear pin 33 shift.

With a shear pin 33 without shifting, only the chamber 18 opens and closes, so that the connecting flap of the shredder system can be attached to the lifting clamp with a small screwing cost.

In the preferred, shown in more detail in FIG. 1-4 embodiments also provides such a shear pin 33, which, however, is connected to the box 15 only indirectly.

In the specified embodiment, as already mentioned, a tab 24 is provided on which the plate 25 is molded, for which the mounting plate 26 is made in one piece. This mounting plate 26 is mounted in a rectangular guide groove 34 configured in the housing and can be moved in a direction parallel to the direction moving the box 15. To connect the mounting plate 26 with the box 15, a pin 27 formed on the mounting plate 26 is provided, which is inserted into the hole 28 in the side wall of the box.

Shear pin 33 is molded at the bottom of this guide groove 34. Mounting plate 26 has a hole 35, which includes shear pin 33 (Fig. 2, 3). Shear pin 33 is connected with the box 15 indirectly, namely through the mounting plate 26 and the pin 27.

To ensure that the pressure exerted on the clamping screw 16 actually caused only the shear pin 33 and not the pin 27 to shift, the strength of this pin to shift should be calculated accordingly higher than that of the shear pin 33.

The shear pin 33 in this embodiment implements an auxiliary function, namely, that it holds the mounting plate 26 or together with it the tab 24 during the assembly of the machine gun, i.e. when inserting individual parts in the lower part of the body, in the desired position. The mounting plate 26 with the molded plate 25 and the tab 24 can be inserted into the lower part by machine, and the frame 14 and the box 15 of the lifting clip 1 can then be put on the mounting plate 26 without problems.

Claims (5)

CLAIM 1. A lifting clamp (1) for installation in the housing of an electrical device, for example, a line circuit breaker containing a rectangular frame (14) and a rectangular box (15), the upper part (150) of which is located between the top (140) and bottom (141) parts of the frame (14), by which the box (15) is held in the frame (14) with the possibility of movement, as well as the clamping screw (16), which passes through the opening (142) made in the upper part (140) of the frame with the possibility of free rotation and enters the thread (152) made in the upper part (150) of the box (15), and The orochka (15) is held in the frame (14) with the ability to move against the resistance, characterized in that the resistance is formed fixed in the case, made mainly in one piece with the case with a shear pin (33), which is connected to the box (15) with a positive fit. 2. A lifting clamp (1) for installation in the housing of an electrical device, for example, a line circuit breaker, containing a rectangular frame (14) and a rectangular box (15), the upper part (150) of which is located between the upper (140) and lower (141) parts frame (14), through which the box (15) is held in the frame (14) with the possibility of movement, the clamping screw (16), which passes through the opening (142) made in the upper part (140) of the frame with the possibility of free rotation and enters into in the upper part (150) of the box (15) thread (152), as well as fixed A tab (24) on the box (15), which extends from the bottom (151) of the box (15) into the space inside the box (15) and runs parallel to the plane of the hole (19) in the housing next to the lifting clip (1), characterized in that on the foot (24) there is formed a plate (25) passing parallel to the bottom (151) of the box, by means of which the foot (24) is connected to the box (15). 3. Clamp (1) according to claim 2, characterized in that the plate (25) is molded passing both perpendicular to it and perpendicular to the foot (24) of the mounting plate (26), which is firmly connected to the side wall of the box (15). 4. Clamp (1) according to claim 3, characterized in that a pin (27) is molded on the mounting plate (26), which enters a hole (28) made in the side wall of the box. 5. Clamp (1) in one of claims 3 or 4, characterized in that a hole (35) is made in the mounting plate (26), which includes a shear pin (33) fixed in the housing.