EP0563848B1 - Spring loaded rotary drive - Google Patents

Abstract

A spring-loaded rotary drive 10 for a load interrupter switch is described, which comprises a blocking device 16 which can be connected to the relevant switch shaft 14, two latching pawls 18, 20 which interact with locking surfaces 22 - 32 on the blocking device 16, and a plate cam 34 which can rotate relative to the locking device 16 against spring force and has cam surfaces 36 - 40 which act on the latching pawls. At least one of the latching pawls 18, 20 also interacts with a locking surface 42, 44 which is provided on the plate cam 34, in order to support the plate cam 34 when the spring arrangement is stressed, while the blocking device 16 is supported on the other latching pawl 20, 18 via an oblique surface 46, 48 which permits automatic tripping, said latching pawl 20, 18 for this purpose being partially lifted off by a relevant cam surface 36, 38 and further lifting off being prevented by a detachable blocking element 50, 52. <IMAGE>

Description

The invention relates to a spring-loaded rotary drive for electrical switching devices, in particular switch disconnectors, with a locking member connectable to the relevant switch shaft, two pawls arranged on opposite sides of the locking member, which interact in the different switching positions with locking surfaces provided on the circumference of the disk-like locking member, in each case are releasable against a spring force, a control disk rotatable relative to the locking member, on the circumference of which control surfaces are provided for ratchet lifting, and a spring device arranged between the locking member and the control disk.

In a spring-loaded rotary drive of the type mentioned at the beginning of DE 39 18 102 A1, the control disk is always rotated relative to the locking member during a respective switching operation so that at the end of this rotary movement the pawl blocking the locking member is completely lifted by the relevant control surface of the control disk and the locking member is thus released, whereby this is suddenly transferred to the desired switching position.

For certain applications, such as the transformer switch drive, it is necessary to keep the switch biased at least temporarily for the transition to a switch position in question.

DE 31 50 905 A1 serves the same purpose as the spring-loaded rotary actuators of the type mentioned at the outset, which operates according to the same functional principle for controllable blocking and triggering of a switch shaft of a load-break switch which can be pretensioned in the switch-on and switch-off direction by means of an energy accumulator and between the switch shaft and the blocking frame provided blocking elements and a controllable trigger shaft known. This one too known device, remote triggering is thus already possible. This is a two-position switch, the energy accumulator of which is formed by a torsion bar spring with a spring bar shaft extending through the selector shaft and in which a latching element, which can be actuated via the release shaft and is active when the torsion bar spring is tensioned, is arranged on a side support of the switch frame while the blocking elements are on whose other side supports are attached.

The aim of the invention is to provide a further spring-loaded rotary drive of the type mentioned at the outset, which, with the simplest construction and reliable operation, in particular also enables such an operating mode in which the switch in question is only biased into a respective switching position.

The object is achieved according to the invention in that at least one of the pawls provided for locking the locking member additionally interacts with a locking surface provided on the control disk in order to support the control disk when the spring arrangement is under tension, while the locking member has a self-releasing inclined surface on the other pawl is supported, which for this purpose is partially lifted off by the relevant control surface of the control disk and is prevented from lifting off further by a releasable blocking element.

According to the invention, a respective pawl serving to lock the locking member is thus additionally used to support the control disk when the spring arrangement is under tension until the locking member blocked by the other pawl is released by releasing a blocking element acting on this pawl and the locking member abruptly into the desired switching position is transferred. Any special additional locking means are therefore not required. After the pawl blocking the blocking member has been released by the blocking element, it becomes The jack is completely lifted over the inclined surface of the pre-tensioned locking element. After the blocking element has been released, the prestressed locking member can immediately follow the control disk.

The control disk can be locked by the relevant pawl, for example, in a standby position, in which the locking member supported on the inclined surface on the other pawl is pretensioned for a transition from an OFF position to an ON position of the switching device in the ON position. In particular for a transformer switch drive, it is also possible to pretension the blocking element in the OFF position.

Preferably, the control disc comprises at least two locking surfaces, each of which, in different readiness positions of the control disc, cooperate with a relevant pawl provided in addition for locking the locking member.

The fact that the blocking elements assigned to different pawls can be actuated simultaneously via a common actuating device reliably prevents the pawls from jamming.

In the subclaims, further advantageous embodiment variants of the spring-loaded rotary drive according to the invention are specified.

Figur 1

eine rein schematische Darstellung eines Federspeicher-Drehantriebs mit in die EIN-Stellung vorgespanntem Sperrorgan,

Figur 2

eine rein schematische Darstellung des in Figur 1 gezeigten Federspeicher-Drehantriebs mit in die AUS-Stellung vorgespanntem Sperrorgan, wobei die den Halbwellen zugeordnete gemeinsame Betätigungseinrichtung weggelassen ist, und

Figur 3

eine Ansicht des Federspeicher-Drehantriebs in Richtung des Pfeiles F gemäß Figur 1.

The invention is explained below using an exemplary embodiment with reference to the drawing; in this shows:

Figure 1

FIG. 2 shows a purely schematic illustration of a spring-loaded rotary drive with a blocking element that is biased into the ON position, FIG.

Figure 2

a purely schematic representation of the spring-loaded rotary actuator shown in Figure 1 with the locking member biased into the OFF position, the common actuating device assigned to the half-waves being omitted, and

Figure 3

a view of the spring-loaded rotary drive in the direction of arrow F according to Figure 1.

The spring-loaded rotary drive 10 shown in FIGS. 1 to 3 is designed for use with a load-break switch with an earthing position provided in addition to the ON and OFF positions.

This spring-loaded rotary drive 10 comprises a locking element 16 which can be connected to the relevant switch shaft 14, two pawls 18, 20 arranged on opposite sides of the locking element 16 and pivotably mounted on a base plate 12 via eccentric bolts 86, 88, one relative to the locking element 16 and thus also to the switch shaft 14 rotatable control disk 34 and a spring device arranged between the locking member 16 and the control disk 34 (not shown).

For connection to the switch shaft 14, the locking member 16 can be attached to a carrier hub which is, for example, keyed to the switch shaft 14 in order to produce a rotationally fixed connection. The locking member 16 can be connected to the carrier hub, not shown, by a rubber layer in order to achieve a certain shock absorption with a limited relative rotation.

The pawls 18, 20 cooperate in the different switching positions with locking surfaces 22 - 32 provided on the circumference of the disk-like locking member 16 in particular.

The pawls 18, 20 are each resiliently held against the circumference of the disk-like locking member 16 or the control disk 34 and releasable against the spring force. For this purpose, control surfaces 36 - 40 are provided on the periphery of the control disk 34, which can be rotated relative to the locking member 16, for ratchet lifting.

The suspension of the pawls 18, 20, like the spring device provided between the locking member 16 and the control disk 34, can each be formed by a torsion spring. Here, the torsion spring, not shown, arranged between the locking member 16 and the control disk 34 is always tensioned when the control disk 34 is rotated in one or the other direction relative to the locking member 16.

In the present exemplary embodiment, both pawls 18, 20 serving to lock the locking member 16 additionally interact with a locking surface 42, 44 provided on the circumference of the control disk 34 in order to support the control disk 34 when the spring arrangement is tensioned, while the locking member 16 has an inclined surface which allows self-release 46, 48 is supported on the other pawl 20, 18. For this purpose, the respective pawl resting on the respective inclined surface 46, 48 has already been partially lifted by the relevant control surface 36, 38 on the circumference of the control disk 34, but is still prevented from lifting off by a releasable blocking element 50, 52.

The blocking elements 50, 52 assigned to the two pawls 20, 18 each comprise a half-shaft 58, 60 which can be pivoted by means of an actuating lever 54, 56 and is arranged in the pivoting range of the relevant pawl 20, 18.

The half shafts 58, 60 assigned to the two pawls 20, 18 can be actuated simultaneously by a common actuating device 62.

This provided on an extension 94 with a terminal block 84 actuator 62 includes a solenoid 64, the Armature 66 carries at the lower end a pin 68 which engages in an elongated hole 70 provided at one end of the actuating lever 56. The other end of this actuating lever 56 is connected to the half shaft 60 rotatably mounted on the attachment 94.

The upper end of the armature 66 comprises two arms 66 ', 66' '(see FIG. 3) which are spaced apart from one another, each of which is provided with an elongated hole 74 into which a pin 72 engages, which is located between the two arms 66', 66 '' of the armature 66 is arranged at the end of a lever 76 which is pivotably mounted about an axis 78 on the attachment 94. The other lever arm of the lever 76 is articulated at the free end to an adjustable linkage 80 which is coupled at the lower end via a swivel joint 82 to the left end of the actuating lever 54 connected to the half shaft 58. This half shaft 58 is in turn rotatably mounted on the attachment 94. The arrangement is such that when the armature 66 moves upward, both pawls 20, 18 are blocked by the half-shafts 58, 60 and are released simultaneously when the armature moves downward.

The two pawls 20, 18 can also be triggered manually via a lever 90 and an extended push button 92 (compare FIGS. 1 and 3).

Devices 96 for fastening signaling switches can additionally be provided on the attachment 94.

The operating principle of the spring-loaded rotary drive according to the invention is as follows:

In the OFF position, the left pawl 18 bears on the locking surface 22 and the right pawl 20 on the locking surface 24 of the locking member 16. If this locking member 16 is now to be biased to the ON position, the control disk 34 is rotated clockwise, for example by means of a plug-in lever or by a drive motor (cf. Figure 1). The right pawl 20 is pivoted outward by the control surface 36 provided on the circumference of the control disk 34 until this pawl 20 strikes the half-shaft 58 assuming the blocking position and is thereby prevented from lifting off completely. In this partially raised position of the pawl 20, the locking member 16 is supported on the locking surface 24 adjoining inclined surface 46 on the pawl 20. The locking member 16 has rotated by an angle β of about 2 ° clockwise, so that the locking surface 22 takes a slight distance from the pawl 18.

As soon as the spring device arranged between the locking member 16 and the control disk 34 is at least essentially tensioned, the control disk 34 assumes the position shown in FIG. 1, in which the spring-loaded pawl 18 is additionally pivoted to the right by a slight amount and the control disk 34 swings on the circumferential latch surface 42 is supported on this pawl 18.

The inclined surface 46, over which the locking member 16 is supported on the other, right pawl 20, encloses an angle α of approximately 30 ° with a straight line G running through the center of the switch shaft and the point of contact with the pawl 20.

In the switch position shown in FIG. 1, the blocking member 16 is thus biased into the ON position via the control disk 34 and the spring device arranged between the latter and the blocking member.

As soon as the right pawl 20 is released via the half shaft 58 by a corresponding actuation of the lifting magnet 64, the pawl 20 is completely lifted off over the self-releasing inclined surface 46 of the locking member 16, whereupon the locking member 16 connected to the switch shaft 14 abruptly in the clockwise direction corresponding Direction RE is transferred to the ON position. Here, the left pawl 18 is pivoted outward by the flank 98 provided on the circumference of the locking member 16 under the half-shaft 60 until it snaps into a recess 104 provided on the circumference of the locking member 16 and on the locking surface 26 of the locking member after reaching the ON position 16 is present. At the end of the sudden transition of the locking member 16 to the ON position, this locking member 16 strikes with the locking surface 28 on the right pawl 20, which remains in contact with the locking surface 26 on this locking surface 28 after contact of the left pawl 18, so that Locking member 16 is fixed in the ON position by the two pawls 18, 20 without play.

The inclined surface 46 provided on the circumference of the disk-shaped locking member 16 forms an angle α of approximately 30 ° with the straight line G running through the axis of rotation D of the rotary drive and the point of contact between the inclined surface 46 and the pawl 20 (see FIG. 1). It can also be seen from FIG. 1 that the locking member 16 in the position biased there into the ON position is at an angle with respect to the OFF position in which the two pawls 18, 20 bear against the locking surfaces 22, 24 β is rotated clockwise by approximately 2 °.

The common actuating device 62 assigned to the two blocking elements 50, 52 ensures that the two half-shafts 58, 60 are rotated at the same time, thereby preventing the pawls 18, 20 from jamming.

In the illustration according to FIG. 2, the locking member 16 is biased into the OFF position.

In order to maintain this operating state, the control disk 34 is rotated counterclockwise about the axis of rotation D, as a result of which the left pawl 18 through the control surface 38 on the circumference of the control disk 34 as far as the stop on the locking end Half wave 60 is pivoted to the left. Here, in turn, the spring device arranged between the blocking member 16 and the control disk 34 is tensioned. With a correspondingly wide rotation of the control disk 34 counterclockwise, limited by the half-shaft 60, the spring-loaded pawl 20 engages in the recess 102 provided on the circumference of the control disk 34, whereupon this control disk is supported on the right pawl 20 via its locking surface 44.

In this position pretensioned in the OFF position, the left pawl 18 is partially lifted off, so that the locking member 16 is no longer supported on the pawl 18 via the locking surface 26, but rather via the adjoining inclined surface 48 which allows self-release. This inclined surface 48 is designed in the same way as the inclined surface 46. In this position biased in the OFF position, the locking member 16 is pivoted slightly clockwise with respect to the ON position, so that its locking surface 28 is now a short distance from the pawl 20 .

If the half-shaft 60 is now pivoted counter-clockwise into the release position via the lifting magnet 64 and the actuating lever 56, the left pawl 18 is pivoted further to the left under the half-shaft 60 via the inclined surface 48 of the locking member 16 biased into the OFF position, whereupon the locking member 16 is suddenly moved counterclockwise in the direction RA into the OFF position. At the end of this rotary movement, the locking member 16 hits with the locking surface 22 on the left pawl 18. Furthermore, during the rotation of the locking member 16 in the direction RA, the right pawl 20 is pivoted outwards over the flank 100 on the circumference of the locking disk 16 under the half-shaft 58, which also occupies the release position. Then this pawl 20 snaps inward again due to the spring assigned to it, whereupon it rests on the locking surface 24 of the locking member 16. In the reached OFF position, the locking member 16 is thus fixed by the two pawls 18, 20 interacting with the locking surfaces 22 and 24 without play.

Even during the switch-on movement of the locking member, the common actuating device 62 assigned to the blocking elements 50, 52 ensures that the two half-shafts 58, 60 are rotated into the release position at the same time and jamming of the pawls 18, 20 is therefore ruled out at all times.

The control disk 34 can turn after the switching-off movement of the locking disk 16 initially by an angle γ of about 9 ° further counterclockwise in the direction RA, whereupon the left pawl 18 due to the inclined surface 105 provided on the circumference of the control disk 34 slightly to the left below the half-shaft 60 is pivoted so that the left pawl 18 finally rests on the control surface 40 provided on the circumference of the control disk 34 due to the spring assigned to it. The switch can thus be brought into a grounding position by turning the control disk 16 further to the left in the direction RA, for example by means of a plug lever or by a motor drive.

With such a further rotation of the control disk 34 to the left, the pawl 18 is pivoted further to the left by the control surface 40 until it stands out from the locking surface 22 of the locking member 16, whereupon this locking member as a result of the now tensioned spring arrangement between this locking member 16 and the control disk 34 suddenly lags the control disc in the grounding position. At the end of this movement, the locking disk 16 hits the latch surface 30 on the pawl 18. On the other hand, the right pawl 20 also snaps inwards, whereupon it rests on the locking surface 32 of the locking member 16. In the grounding position, the locking disk 16 is thus interacting with the locking surfaces 30, 32 of the locking member 16 by the two Jacks 18, 20 fixed without play.

In the grounding position, a locking surface 106 engages behind the left pawl 18. As can be seen from FIG. 1, this locking surface 106 of the control disk 34 is opposite to the horizontal H by an angle Stellung of approximately 27 ° in the position pretensioned in the OFF position offset clockwise.

As can be seen in particular from FIGS. 1 and 3, the blocking elements 50, 52 having the half-shafts 58, 60 can be operated manually via the linkage 80 comprising the operating lever 54. For this purpose, a lever 90 is provided which is pivotably attached to the attachment 94 and which engages on the intermediate lever 54 connected to the half shaft 58 and can be actuated via an extended push button 92.

Claims (6)

1. Spring-loaded rotary drive (10) for electrical switching apparatus, in particular for load interruption switches, comprising a blocking member (16) which can be connected to the relevant switch shaft (14), two latches (18, 20) arranged on opposite sides of the blocking member (16) which cooperate in the different switch positions with latch surfaces (22 - 32) provided at the periphery of the in particular disc-like blocking member (16) and which are respectively releasable against a spring force, a control disc (34) which is rotatable relative to the blocking member (16), with control surfaces (36 - 40) being provided at its periphery for latch lifting, and also with a spring means arranged between the blocking member (16) and the control disc (34), characterised in that at least one of the latches (18, 20) provided for the latching of the blocking member (16) additionally cooperates with a latch surface (42, 44) provided at the control disc (34) in order to support the control disc (34) with a tensioned spring arrangement, whereas the blocking member (16) is supported at the other latch (20, 18) via an inclined surface (46, 48) which permits a self release, for which the other latch is partially lifted by the relevant control surface (36, 38) of the control disc (35) and is prevented from lifting further by a releasable blocking element (50, 52).
2. Spring-loaded rotary drive in accordance with claim 1, characterised in that the control disc (34) can be latched by the relevant latch (18) in a position ready for action in which the blocking member (16), which is supported via the inclined surface (46) at the other latch (20), is biased into an ON position for a transition of the switching apparatus from an OFF position into the ON position.
3. Spring-loaded rotary drive in accordance with claim 1, characterised in that the control disc (34) can be latched by the relevant latch (20) in a position ready for operation in which the blocking member (16), which is supported via the inclined surface (48) at the other latch (18), is biased into an Off position for a transition of the switching apparatus from an ON position into the OFF position.
4. Spring-loaded rotary drive in accordance with one of the preceding claims, characterised in that the control disc (34) has at least two latch surfaces (42, 44) which, in different positions of the control disc (34) ready for operation, respectively cooperate with a relevant latch (18, 20) which is additionally provided for the latching of the blocking member (16).
5. Spring-loaded rotary drive in accordance with one of the preceding claims, characterised in that the releasable blocking element (50, 52) includes a half-shaft (58, 60) which is in particular pivotable by means of an actuating lever (54, 56) and which is arranged in the region of pivoting of the relevant latch (20, 18).
6. Spring-loaded rotary drive in accordance with one of the preceding claims, characterised in that the blocking elements (50, 52) associated with different latches (20, 18) are simultaneously actuatable via a common actuating device (62).

Images