DK165082B - FUSE SWITCH - Google Patents

Abstract

1. A manually operated fuse switch (1) with a switch rocker (16) and a duct (4) accommodating the fuse link (5), whose switch rocker (16) covers the duct (4) for the fuse link (5) when the switch (1) is in the switched on position, - the switch rocker (16) - having a lever type design, - comprising an actuating arm (46) and a drive arm (45) and - the drive arm (45) being locked in the open position of the switch rocker (16) by a catch (56) when the fuse link (5) has been removed or incorrectly inserted, characterized in that the actuating arm (46) of the switch rocker (16) comprises a knee joint (49) subdividing the actuating arm (46) into an inner arm (47) and outer arm (48), which knee joint is spring loaded against the switching on direction (41) of the rocker.

Description

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The invention relates to a hand operated circuit breaker according to the preamble of claim 1. Such circuit breakers act blockwise arranged side by side especially as low voltage fuses in connection with housing.

Such switches, such as those known in known disclosure disclosures in DE disclosure specification 2,934,149 or DE disclosure disclosures 2,618,360, are provided with a lid-shaped switch blade with which a switch located in the housing is hand operated. Thus, in the closed position of the switch, the space provided for the melt protection insert is covered by the switch wing. Thus, in connection with the replacement of the fuse, the switching wing must first be placed in an open position, whereby the contact piece of the fuse insert on the supply side has no connection with the power supply network. At the same time, a locking mechanism is activated by not inserted or incorrectly inserted melt protection insert, which blocks the switching lever in its open position. A high degree of V is thus provided for the user.

of touch security.

The invention is based on the experience that, in practice, by a strong influence on the switching wing, a destruction of the locking mechanism can be provided. This makes the switch unsuitable for operation or, at worst, provides an end of the load switch, whereby the bottom contact element provided on the supply side is energized. In particular, when an electrical consumer is secured several times by block-by-side fuse switches, parts of the consumer can be energized over the parallel-located fuse switches provided with properly functioning fuse protection circuit, although there is obviously a fault in the consumer circuit.

The object of the present invention is thus to provide a circuit breaker which is designed so that the locking of the circuit breaker is effectively protected against destruction from excessive hand operation of the circuit breaker.

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The stated object is achieved with a hand operated circuit breaker of the kind initially provided, which according to the invention is peculiar to the design according to the characterizing part of claim 1.

Advantageous further developments and constructive characteristics of the invention are described in the further claims.

By the knee joint provided by the invention in the actuating arm of the switching wing it is obtained that these are not in themselves rigid. Upon removal of the locking insert and thus blocked switching lever, the knee joint, when strongly exerted by the switch, goes out of its stretched position against the spring load to its bent position. In this way, the stop is not affected by the full operating force which, in the case of known circuit breakers, is multiplied by the lever action, but only by a fraction dependent on the spring load.

In the characterizing parts of claims 1-3, a construction technically particularly suitable solution of the stated task is described. The knee joint is affected by a pivot spring coaxially provided with its axis of rotation in the extension direction. This 20 swivel spring can almost be integrated into the joint, creating a particularly compact and space-saving structure.

By the special designation of the spring constant, a problem-free effect of the circuit breaker provided by the invention is ensured. Since the transferable forces are greater than the 25 switching forces to be overcome, the circuit breaker can be closed at any time when the melt protection insert is properly inserted.

If the switch wing is blocked, only a fraction of the force of force is transmitted through the spring to the locking part. In the spring construction, this force is so low that there is no risk of damaging the locking components 1 in the switch. In addition, the circuit breaker acts as well-known circuit breakers when properly installed fuses. Thus, for unskilled personnel, there is no change in the operation. The particular safety-advantageous relationship of the safety switch provided by the invention first appears through improper operation.

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Since, according to the characterizing part of claim 4, the knee joint provided is located in the area within the actuating arm near the pivot point of the switch wing, only actuating the switch above the knee-protected outer leg of the actuating arm can be provided. Because the inner leg is very short, this does not have an attack surface for activating the switch. In addition, due to knee joint placement near the pivot relative to the locking point, there is an approximately straight arm ratio. This facilitates the designation of the pivot spring, since its spring constant must be provided solely so that the maximum force that can be transmitted is less than the breaking force of the locking point. Complicated calculations for this due to different lever ratios may be omitted.

According to the characterizing part of claim 5, the knee joint is particularly well protected against external intervention and improper treatment. Since the pivot spring does not extend beyond the contour surface of the switch wing, the pivot end 20 of the pivot spring cannot cause damage to the operator.

In accordance with the characterizing part of claim 6 on the bending direction side behind the abutment surfaces provided for joint abutment of the inner and outer legs against each other, an overstretching of the knee joint is effectively avoided by the action of the switching ring in the opening direction. Above all, in the angular configuration of the abutment surfaces of claim 7, a stable structure of the knee joint is provided. Since the contact surfaces are mainly close to one another, the surface pressures acting on the contact surfaces are distributed regularly.

These properties are further supported by the characterizing part of claim 8, in that special material is provided for abutment of the knee joint and the two abutment surfaces. In short, the circuit breaker provided by the invention works with great security and is largely protected against damage.

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There are particular advantages to the circuit breaker provided by the invention when multiple circuit breakers, as described in claims 9-10, are assembled into a circuit breaker. If only one fuse insert is not inserted or not 5 is inserted correctly, the locking mechanism located in the respective circuit breaker is blocked and all the circuit breakers are blocked through the rigid connection of the drive arms. Since all the actuating arms of the switch wings are secured by a knee joint, it is not possible to destroy the locking mechanism, and the consumer connected to the locking block cannot be fully or partially energized. Thereby, there is provided a significant safety advantage over known switch blocks. A particularly advantageous simple structure of the switch wing is described in claim 10. The entire block is actuated almost by a single switch wing secured by a knee joint.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an opened half of the circuit breaker housing with a properly inserted fuse insert and with the load circuit breaker in the switch-on position; FIG. 2 is a plan view similar to FIG. 1 with removed fuse insert and with the switch rocker and the load switch in the switch-off position, fig. 3 is a plan view corresponding to FIG. 1 and 2 25 with the removed melt-protection insert and with a specified activation of the switch rocker despite blocking.

The fuse switch indicated in all three figures with 1 includes two housing halves 2 provided by insulating material, only one of which is illustrated in the figures. The splitting joint between the housing halves 2 proceeds in the drawing plan of the figures. The two house halves 2 are riveted together + 1 but together. The rivets are passed through the through bores 3. The fuse switch 1 includes a fuse compartment 4 for receiving the melt fuse insert 5. The fuse connection 5 of the fuse insert 5 is provided by the connection terminals 6, 7. The connection terminal 7 is connected over the conduit 10 with the threaded piece 8,

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the threaded piece the screw cap 11 connected to the retaining cap 9 can be ice screwed.

The melt fuse insert 5 is formed at its top and bottom end with an end contact piece, namely the top contact cap 5 12 and the bottom contact cap 13. A properly screwed screw cap 11 provides a conductive connection between the screw cap 11 and the top contact cap 12 of the fuse insert 5 of the bottom contact piece 13. 10 is in contact with a counterclockwise member 14 provided within the plane of the figure. The counterclockwise member 14 is guided laterally out of the area of the fuse space 4 to a contact bridge 15 on a load switch actuable by the switching wing 16. The contact bridge 15 lies at the switched load switch (Fig. 1) with both of its contact pieces 17, 18 abutting against the contact contacts 15 19, 20 on the counter contact piece 14 of the fuse insert 5 and a contact tab 21 connected to the connection terminal 6 respectively.

The contact bridge 15 is actuated by the pressure of the closing springs 22, 23 in the direction towards the counter contact pieces 19, 20 in the switch-on position. The closing springs 22, 23 support with the lower end pieces on the housing wall 24.

A thrust bar 25 provided in the insulating material is in contact with one end of it with the upper side of the contact bridge 15. The thrust bar 25 is mounted so within the circuit breaker 1 that in the pressure direction of the closing springs 22, 23 and perpendicularly to the longitudinal direction of the contact bridge, is displaced in its longitudinal direction between the housing walls 27. At its location on top of the contact bridge 15, it lies in the gap between the electrically conductive interconnecting piece 19, 20 connected in contact with the contact bridge 15.

The switch rocker 16 is pivotally mounted about the rotary shaft 28 provided vertically on the drawing plane 1. It is formed on the end 29 facing the thrust bar 25 with a cut-out 30 for receiving a side member of the switch rocker 35, is referred to as the switching wing control-

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The member 31, together with a further control member 32, provides a lever with knee joints referred to as 33. The free end of the switch wing control member 31 is pivotally mounted about the shaft 28 of the switch wing 16. The control member 5 32 acts as a pressure transmitting element and is in contact with its free end 34 in contact with the back side of the thrust bar 25 which faces away from the contact bridge 15. The free end 34 of the control means 32 thus rests in a groove 35 provided at the rear of the thrust bar 25 in such a way that it can be rotated 10 at an angle in the wedge-shaped cut of the groove 35 in the plane of the figure. By actuating the contact bridge 15 and the thrust bar 25 through the closing springs 22, 23, the control means 32 constantly has its free end 34 located in the notch 35.

When transferring the switch wing 16 from the switch-on position (Fig. 1) to the switch-off position (Fig. 2), the lever-shaped bar through abutment on the lower end of the cut-out 30 in the switch-wing 16 is pushed through its stretched position (not shown). Hereby, the knee joint axis 36 of the lever 33 20 provided by the knee joint moves downwardly in the direction of the contact bridge 15. Through the control means 32, the pushing rod 25 is thereby pressed downwards (arrow direction 26) and the contact bridge 15 is removed from the counter contact pieces 19, 20 (Fig. 2).

Next, a brief structure and operation of the locking device associated with the switching wing 16 is described.

It generally includes a locking bracket 37 extending in the direction of arrow 26, which, with the end 38 facing the contact pieces, is secured to the counter contact piece 14 next to the contact bridge in the edge area of the fuse space 4. The free end 39 30 of the locking bracket 37 is located in the region of the end piece 29. of the switching blade 16 In the switching position 16 of the switching blade 16, the cut-out 30 lies outside the free end 39 of the locking bracket. The counter-contact piece 14 of the fuse insert 5 is actuated from below through a contact spring 40, which with its lower end supports 35 on the wall 24 of the housing. In the switch-off position of the switching wing 16 (Fig. 2), the cut-out 30 is opposite the free end 39 and

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of the locking bracket 37. If the fuse insert 5 is now removed, it is lifted towards the contact piece 14 by the action of contact springs.

40, and the free end 39 of the locking bracket is displaced into the cutout 30. By actuating the switch wing 16 in the engagement direction 41, the free end 39 of the locking bracket 37 comes into contact with the edge 42 of the cutout 30, thereby blocking the switching wing 16. This situation is illustrated in FIG. Third

The structure and operation of the switching wing 16 are explained in the following with reference to this figure: 10 The switching wing 16 is designed as a lever and is rotatably rotated about the axis of rotation 28 of the circuit breaker 1. It is essentially L-shaped, the L horizontal leg 43 having its free The cylindrical roller 44 is formed in the portion of its circumferential region facing the contact pieces with the cut-off 30, in which the locking bracket 37, by missing or improperly inserted melt protection insert 5, is formed. engages and where the switching wing control means 31 is located. The portion of the cylindrical roller 44 facing the contact pieces thus acts as a driving arm 45 for the lever 33 provided by the knee joint, thereby acting upon the activation of the contact bridge 15 over the thrust bar 25. The portion of the cylindrical roller 44 facing away from the contacts, 25 together with the Lf-shaped piece are referred to as actuating arm 46. This actuating arm 46 is divided into an inner leg 47 and an outer leg 48 through the knee joint 49 provided in the transition region between the cylindrical roller 44 and the L horizontal leg 43. 49 is actuated by a concentric pivot spring 51 positioned by its articulated axis 50 against the switching direction 41 of the switching wing 16. The force of force is transmitted through the free ends 53, 54 of the pivot spring 51, which abut against the side of the inner leg 47 facing in the bending direction 55. ben 48.

The swivel spring is provided with such a spring constant that, through this transmitted force, it is greater than the coupling forces to be overcome but less than the locking force provided by the locking lever 37's engagement 56. This remains the knee joint 49 by activating the unblocked switch wing 16 (Fig. 1) at the spring load mainly in its stretched position. At blocked switch angle (Fig. 3), the knee joint 49 is transferred to its bent position.

In FIG. 3, a particularly advantageous embodiment of the design of the switching wing 16 is shown with the knee joint 49. The knee joint 49 is located in the cut-away position 57 in the transition area between the cylindrical roller 44 and the L-horizontal leg 43, without the free ends 53, 54 of pivot spring 51 protrudes beyond the contour of switch switch 16. From this cut 57, a dividing joint 58 extends along the periphery of the cylindrical roller 44. The inner leg 47 and the outer leg 48 are formed with facing abutment surfaces 15 59, 60 which face each other when the knee joint 49 (Figs. 1, 2) is placed in the stretching position. The angular shape of the contact surfaces 59, 60 * is thus advantageous in this way, since activation forces are distributed in almost any direction through the close abutment of the angular surfaces as best as possible. In addition, the special design of the switching wing 16 as an L-piece and a cylindrical roller 44 provides an increase in the size of the facing contact surfaces 59, 60, thereby further reducing the occurring special surface pressures. interlocking fuse switches 1 according to FIG. 1-3, a multi-pole switch block may be provided. In connection with such switch blocks, the individual switching wings 16 are coaxially mounted on a rotary shaft 28. In addition, it will be an advantage of the invention if the cylindrical rollers provided as inner legs 47 on the actuating arms 46 or as drive arms 45, respectively. 44 is rigidly connected to each other, in practice this is achieved by the use of a single-piece continuous cylindrical roller 44 for the individual circuit breakers 1 in the fuse block. Through this rigid connection, the entire fuse block is secured by locking a of

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0 the circuit breaker 1 through the engagement of the respective locking bracket 37 in a cutout 30 is locked. Since the outer leg 48 of the switch wing 16 can simultaneously break in the knee joint 49, the locking block cannot be actuated, just as the engagement 56 at 5 does not violently change the switch wing 16 to switch-on position (Fig. 1). In the rigid connection of the outer leg 48 of the actuating arms 46 of the individual fuse switches 1, these act in a single unit as a multipoint fuse block, the locking function of the missing or incorrectly inserted fuse insert 5 starting from a single pole always preventing activation of the the total block. In this case, the provision of a rigid connection of the cylindrical rollers 44 to produce a coherent component is superfluous. Because only a driving arm 45 is blocked by engagement, due to the rigid connection of the outer legs 48 with each other, only a bending torque can be transmitted on all knee joints, while no more torque can be applied to the non-blocked driving arms.

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Claims (12)

0 10 DK 165082 B Patent claims. 1. Hand-operated fuse switch (1) with a switching vane (16) and a fuse compartment (4) for receiving a fuse protection insert (5) / which switching vane (16) in the switching position of switch 5 (1) covers the fuse space (4) for receiving the fuse protection insert (5) - wherein the switching wing (16) - is configured as a lever, - includes an actuating arm (46) and a drive arm (45), 10. and that the drive arm (45) is inserted or not properly inserted in the fuse insert (5). is blocked in the open position of the switching wing (16) through an engaging means (56), characterized in that the actuating arm (46) of the switching wing (16) includes a spring-loaded, actuating arm (46) in an inner leg in the opposite direction of the switching direction (41). (47) and an outer leg (48) dividing knee joint (49), the bending direction (55) of the knee joint (49) extending in the same direction as the switching direction 20 (41) of the switching wing (16). A circuit breaker according to claim 1, characterized in that the spring load in the knee joint (49) providing a spring is a coaxial with the articulation axis (50) in the knee joint (49) provided with pivot spring (51), the free ends of which 25 (53, 54) on one side affects the inner leg (47) and on the other side the outer leg (48) of the actuating arm (46) on the side facing the bending direction (55). A circuit breaker according to claim 2, characterized in that the pivot spring (51) is provided with a spring constant such that the forces transmitted by the spring are greater than the switching forces to be overcome, but less than those at the engagement ( 56) provided locking forces such that upon activation of a non-blocked switching wing (16) at the spring load, the knee joint (49) remains in its extended position and the knee joint (49) is transmitted to the blocked engagement wing (16). its bent position. n DK 165082 Β ο Fuse switch according to claims 1-3, characterized in that the knee joint (49) is provided in a region within the actuating arm (46) in the vicinity of the rotary shaft (28) of the switching wing (16). Fuse switch according to claims 1-4, characterized in that the actuating arm (46) of the switching wing (16) is the L-shape with a vertical leg which in the switch-on position covers the locking compartment (4) and in the switch-off position does not cover the locking compartment (4). , wherein the knee joint (49) is provided internally on the horizontal leg (43) in which the hinge shaft (50) is provided, and that the horizontal leg (43) is formed on the inner side facing in the bending direction (55) with a cut-out (57) in which the knee joint (49) is positioned and the swivel spring (51) is provided within the L-shaped contour surface. A circuit breaker according to claims 1-5, characterized in that the inner leg (47) and the outer leg (48) of the actuating arm (46) are provided with the opposite bending direction behind the knee joint (49) facing each other 20. contact surfaces (59, 60) for mutual contact. A circuit breaker according to claim 6, characterized in that the abutment surfaces (59, 60) are formed at an angle and that in the substantially extended position of the knee joint (49) they close together. A circuit breaker according to claims 1-7, characterized in that the inner leg (47) of the actuating arm (46) and the drive arm (45) are together formed of a pivotally mounted cylindrical roller (44). Multipole, of safety switches (1) parallel to one another, provided switch block according to Claims 1 to 8, characterized in that the switch wings (16) are coaxially mounted and that the drive arms (45) and the the inner legs (47) of the actuating arms (46) with respect to the on and off turning motion are rigidly connected to each other. 35 o 12 DK 165082 B 10. · Multi-pole, of parallel circuit breaker (1) provided switch block according to claims 1-8 / characterized in that the outer legs (48) of the actuating arm (46) relate to the switch-on and switch-off movement 5 are rigidly connected to each other, and 'especially provided in one piece in a plastic. 10 15 20 25 30 i 35