DE3123894A1 - LOAD SELECTOR - Google Patents

Description

Load selector switch

The invention relates to focus on a load selector switch according to the preamble of claim 1.

In the following, a load selector switch with these features is only described as a load selector switch of this type designated.

Known load selector switches of this type can be rotatable switches in which the first contacts are longitudinal the circumference of a circle are arranged and the carrier around the axis or the center of the circle is rotatably mounted. Known load selector switches can also be of a linear design, in which the first contacts are arranged along a straight line and the carrier is arranged such that it is a Can perform linear movement parallel to the straight line. With both types of this known load selector switch the bridging contacts are essentially at a fixed distance from one another in the direction the movement of the movable carrier relative to the fixed support member. Furthermore owns each first contact normally has an extension in the direction of movement of the movable carrier relative to the fixed support member, which is at least as large as the fixed distance with which the bridging contacts are arranged to each other. In this way, the overall dimensions of the known load selector switch of this type, which have a given number of first contacts, by the extension of one each first contact in the direction of movement of the movable carrier relative to the fixed support member determined, the extension of each first contact in turn from the fixed distance of the

Jumper contacts is dependent.

The object of the invention is to provide a comparatively compact load selector switch of this type to create, which is designed such that the separation between the during a selection circuit Bridging contacts in the direction of movement of the movable carrier is changeable relative to the fixed support member.

According to the invention, the solution is that the bridging contacts are mounted on a linkage are, which is received by the carrier, wherein the linkage is actuated so that the Separation position between the bridge contacts in the direction of movement A of the movable carrier relative to fixed support member is changeable.

Because the separation or the distance between the bridging contacts in the direction of movement of the movable carrier is changeable relative to the fixed support member, it is possible during a Selector circuit in which the normally open contact arrangement from its stationary operating position, in which it is in contact with the selected first contact, moves into its stationary operating position in which it is in contact with the adjacent selected first contact that Separation position between the bridging contacts initially to be vca-larger that the bridge contacts bridge the selected and the selected first contact and thus remain in the bridging contact until at least the normally open contact arrangement is out of contact with the selected first contact and has been moved into contact with the selected first contact, and subsequently the separation distance between the bridging contacts. The change in the separation distance of the bridged

ORIGINAL INSPECTED

copy

Kungskontakte allows the first contacts a have limited extension in the direction of the carrier movement, creating a compact load selector switch is realized.

It is expedient that a pretensioning device is assigned to the linkage in order to yield the bridge contacts to press against each other, so that they take positions in which they are in a minimal Distance from one another are located, the bridge contacts then being arranged at a minimal distance from one another are when the normally open contact arrangement is in their stationary operating position, the movement of the movable carrier relative to the stationary Support member to the normally open contact arrangement from its contact position with the selected first contact -and in contact position with the selected first contact, has the consequence that the rear bridging contact is moved against the selected first contact, which acts as a cam for actuating the Linkage is used and 'the separation position between the bridging contacts against the resilient bias enlarged by the biasing device, whereby the front bridging contact is in contact position and cam makes contact with the selected first contact.

It is also useful that the parallel linkage has first and second links, which are in the vicinity one of its ends at a fixed, first joint are articulated to one another, as well as having third and fourth links, the first and two-boo, respectively Have ends and articulated to one another at a movable, second joint between their linden trees Are connected like scissors, the other ends of the first and second links each articulated with the third and fourth links near the first ends at movable third and fourth, respectively

Joints are connected, and the third and fourth links in the vicinity of their second ends are different the bridge contacts wear. With such a parallel linkage, the first link is parallel to the fourth link and the second link is parallel to the third link. Appropriately has the biasing means includes a tension spring extending between the third and fourth joints and connects these together. According to a further embodiment, the carrier has a guide device, for example one or more channels to the movable second joint and / or one or more to guide the movable third and fourth joints during the actuation of the parallel linkage.

The bridging contacts are expediently designed as contact rollers. Characteristically, the bridging contacts with cylindrical Sections of the first contacts produce a contact position, the cylindrical sections fixed or rotatable (for example contact rollers) can be arranged.

The impedance is expediently a resistor or a reactance tapped in the middle.

According to a further embodiment of the invention, the first contacts are along the circumference or an arc of a circle and the carrier is rotatably arranged around the center point of the circle. Alternatively but for this purpose it is also expedient to arrange the first contacts along a straight line, in which case Case the carrier is arranged to be movable parallel to the straight line.

An exemplary embodiment of the invention is described below with reference to the drawing. Show in it

COPY

baeToriginal

Fig. 1 is a schematic view of a load selector switch qomriß der KrI I lulunq,

FIG. 2 is a view similar to that in FIG. 1, however with removed linkage as well

3 shows schematically different positions of the linkage of the load selector switch shown in FIG. 1 .

The one shown in Fig. 1 and generally designated by the reference number 1 marked multiple load selector switch comprises a stationary, electrically insulating support member 2 which has a number of first contacts 3 (of which only some are provided with a reference number and of which two are adjacent with the reference numerals 3A and 3B in Fig. 1), which along a circle at locations with are fixed at an even distance from one another, and further has a movable, electrically insulating (non-conductive) carrier 4, which is attached to a rotary shaft 5. The shaft 5 extends through a cylindrical bore, not shown, which is provided in the support member 2, so that the shaft 5 is rotatable relative to the support member 2 and has an axis which extends through the center point of the circle, on the circumference of which the first contacts 3 are arranged. On the carrier 4 are a Main contact arrangement, generally designated by the reference number 6, and a main contact arrangement, generally designated by 7 Parallel stored: ..

Although Fig. 1 is only a schematic view, the main contact arrangement comprises a main or Working contact made of copper for making electrical contact with a cylindrical copper section of each first contact 3 and a rotatable and cylindrical short-circuit contact (arcing

BATH ORIGINAL

contact) made of a copper-tungsten alloy, which arranged to be radially movable relative to the working contact, so that electrical contact with a cylindrical section made of copper-tungsten alloy is a every first contact 3 can be made. First spring elements, not shown, are expediently provided, .um the short-circuit contact relative to the normally open contact resiliently radially outward to press. ZwciLc-, also not shown Spring elements are used to counteract the normally open contact arrangement 6 in a resilient manner radially outward to press the first contacts 3.

The parallel linkage 7 comprises a first and second link 8 and 9, which are each pivotably connected in the vicinity of their ends to a shaft 10 which is arranged on the carrier 4 and forms a first joint, and also has a third and fourth link 11 and 12, each having first ends 11a and 12a and second ends 11b and 12b. The links 11 and 12 are articulated between their ends by a movable stub shaft 13, the stub shaft protruding at one of its ends into an elongated guide slot 14 (see FIG. 2) which is formed in the carrier 4 and whose width is only slightly larger than the diameter of the shaft 13. The shaft 13 causes a scissor-like effect for the links 11 and 12 and represents a second joint for the parallel linkage 7. The ends of the links 8 and 9, which are arranged at a distance from the first joint, are each connected to the first ends 12a and 11b of the fourth and third links are pivotally connected by means of movable stub shafts 15 and 16, whereby third and fourth joints are formed for the parallel linkage 7, respectively. One end of each shaft 15, 16 protrudes a short distance so that the shaft ends are connected to one another by means of a helical tension spring 17.

COPY ORIGINAL INSPECTED

which can be which the shafts 15 and 16 against each other pulls. Another helical spring, not shown, the opposite ends of a connect each shaft 15, 16 together. Optionally, additional spring elements, not shown, can be used in the form of a spring metal strip or wire, with the spring metal around one end of the shaft 1 5 (16) is wound and opposing arm portions act against the shafts 10 and 13, around the Press shafts 15 and 16 together. Each in the vicinity of the second ends 11 b and 12 b of the links 11 and are contact rollers 18 and 19 made of a copper / tungsten alloy arranged which a pair of bridge contacts for bridging the cylindrical sections Form adjacent pairs of first contacts 3. The contact rollers 18 and 19 are also electrically conductive opposite ends of a center-tapped resistance 20a, 20b tied together. The coil spring or coil springs 17 and the spring metal strip or wire (if provided) resiliently urges rollers 18 and 19 into one Position (see Fig. 1) in which they have a minimal distance from each other.

When the work contact arrangement 6 is in an operating position · Is in electrically conductive contact with the first contact 3A, such as shown in Fig. 1, the bridging contacts on each side of the first contact 3A (see Fig.1 and fully extended position of Fig. 3.). In order to effect a shift change, the shaft 5 rotated about its axis relative to the support member 2 in a Rich Lung. FaILi; for example the normally open contact arrangement 6 is to be moved into contact position with the first contact 3B, which connects to the contact 3A, the shaft 5 is rotated clockwise A (see FIGS. 1 and 3). At first the trailing Bridge contact 18 in contact with the first contact 3A

ORJG / NAL INSPECTED

bownqL, which dionfc as a Nocko, to push the bridge contact 18 radially inward when the contact 18 is moved over its surface. Since the shaft 10 is arranged on the movable carrier 4 in a fixed position, the movement of the contact 18 radially inward is absorbed by a radial contraction of the Parailelgestängcs 7, whereby the shafts 15 and 16 against the spring or springs 17 and spring metal strips or Wires (if provided) are pushed apart. When the shafts 15 and 16 are moved away from each other, the bridge contacts 18 and 19 move further apart, with the result that the front bridge contact 19 is moved relative to the carrier in the circumferential direction against the first contact 3B. Because of this relative movement in the circumferential direction, the extent of the rotational movement of the shaft 5 in direction A, which is required to bring the front bridge contact 19 into contact with the first contact 3B, is smaller than it would be if the bridge contacts 18 and 19 were not could be moved apart in the circumferential direction but would be mounted on the carrier 4 in such a way that they can only move radially inward. When the bridge contacts 18 and 19 are in contact with the first contacts 3A and 3B (see the dashed position in Fig. 3), the further rotation of the shaft 5 in direction A causes the contact between the normally open contact arrangement 6 and the first contact 3A to be interrupted and the contact position with the first contact 3B is established. Finally, with a continued rotation of the shaft 5 in direction A, the trailing or rear bridge contact 18 leaves contact with the iTsLun contact JA and ge extends the front bridge contact 19 out of contact with the first contact 3B, so that the bridge contacts on each side of the and are arranged at a distance from the first contact 3B (see. Dashed line in Fig. 3).

COPY

'ORIGINAL INSPECTED

KaLIiJ the ArbciLskonlaktordnung f> oinon work contact and a short-circuit contact in the manner described above, then the normally open contact is in front a contact of the front bridge contact with the first one Contact 3D moved out of the contact stub with the first contact 3A, the short-circuit contact still in Contact position with the first contact 3Λ is left. The contact between dom short-circuit contact and the first Contact 3A is not interrupted until the front bridging contact is in contact with the first Contact 3B reached. When this is done (see dashed line in Fig. 3) the following remains: the goal Bridging contact 18 in contact position with the first contact 3A and the front bridge contact remains 19 in contact with the first contact 3B until the shaft 5 moves through a suitable angle has rotated in direction A, so that the short-circuit contact can be moved into contact with the first contact 3B. In the final stages of the circuit the normally open contact is moved into contact position with the first contact 3B and take the bridging contacts 18 and 19 take their positions on either side of the first contact 3B.

Of course, it is realized that the first contact 3B during the selection circuit described above serves as a cam when the front bridging contact 19 is moved across its contact surface. It can be useful for the contact rollers 18 and 19 (or H. .i) even said that never only the third and fourth links are mounted so that they are relative to the links on which they are mounted, can be moved against the axis of the shaft 5 against the resilient bias. Of course such movement would be limited to ensure that the first contacts 3 are the desired Would bring about cam action.

ORIGINAL INSPECTED COPY

If so desired, the arboits contact arrangement back to the contact sharing with the first contact 3A to move, the shaft 5 is counterclockwise turned. The mode of operation of the selector switch 1 is then similar to the movement described above, however with the exception that the contact roller 19 is the rear, or trailing bridge contact and the contact roller 18 represents the front bridging contact represents.

The arrangement of the bridge contacts 18 and 19 on the Parallel linkage 7, which changes the spacing movement of the bridge contacts 18 and 19 in the circumferential direction enables (i.e., the direction of movement of contacts 18 and 19) enables the formation a compact multiple selector switch 1, in which the first contacts 3 are arranged along the circumference of a circle, which is a relatively has a small radius. So far, the multiple selector switches essentially have been formed with bridge contacts which are at a fixed distance are to each other and pressed against first contacts sirid, which are arranged at the same distance from each other are, each contact having a circumferential extent that is at least as large how the distance between the bridge contacts is. In these previously known multiple selector switches that have a large Having number of first contacts, it was therefore necessary that the first contacts along the circumference a circle have been arranged, which has a relatively large radius. How on As can be seen from Fig. 3, the bridge contacts 18 and 19 are at a maximum distance from one another in the circumferential direction when the carrier 4 is in an intermediate position substantially in the middle between a pair of places where the action with the working contact takes place, the contacts 18 and 19 are respectively + in their dashed positions

touch contacts 3A and 3B. This way enables it is the variable geometry of the pantograph-like parallel linkage 7 that the distance between two contact rollers 18 and 19 to bridge of an adjacent pair of the fixed first contacts 3 increases and can also be decreased, so that in a parked, stationary position on each side of a first contact 3 is the electrical gap between each contact 18, 19 and the adjacent first contact 3 is maximized.

In order to cause a rotation of the shaft 5, a The gearwheel, not shown, can be firmly formed with the shaft 5. In this case the gear can be provided with an elongated slot (not shown) which is similar to the slot 14 in the carrier 4 is dimensioned to receive an extended end of the shaft 13.

Any one or more of the rotatable short-circuit contacts of the normally open contact arrangement 6 and the contact rollers 18 and 19 can be mounted so that they are in can rotate in one direction, but rotation in the opposite direction is prevented when these contacts are moved against the surfaces of the first contacts 3.

Although the invention has been described in relation to a rotary multiple load selector switch, it is the invention also applicable to a linear switch which is arranged along a straight line has first contacts.

The bridge contacts can be electrically through a reactance tapped at the center, for example a inductive reactance, electrically connected instead of a resistor tapped in the middle

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Claims (13)

'• "iinnlornlrnnn 10 ^ Πΐ ^' Ίΐ, Α Ό Ü't>) / '. I FhnnrirlmrRtmflo 17 Pootinch 1 HO Ulpi.-Hig.'H. '+ I. tSSUU . . ΡοιΙΙ, νΙι 4IHnM Pat. Horrmann-Trentopohl Dinl-Phv «? Fdltnrd Rt * Mi * r * "" Pat.-App. Botzler Fern3 _P r ₀ chor: 0 23 23/510 13 Uipl.-KHyS. TOUARU ΒβΐΖΐθΓ Telephone: 089/38 30 11 "" ⁵¹ ° "Dipl.-Ing.W. Herrmann-Trentepohl ³⁰³ ° ¹² rolegrommanschrllt: "38 3013 Dnhipntonto Horno PATENTANWÄLTE _% Toloflinniinnniichrltt: Telex 08229853 'Bobotzpat Munich Telex S215360 bank accounts: . "'■' Bayerische Vorolnsbank MDnchen 952 - · .-,. ". -. -.- ViI '> ■ Dresdner Bank AQ Herne 7-520 499 - - ^! '' Postal check account Dortmund 558 68-467 ASSOCIATED TAPCHANGERS LIMITED Ref .: FuIbourne Road,
London E17 4EQ "_,. ,. ^ Please specify in the answer Great Britain Please send a letter to: Munich Patent claims: - = \
^ 1. Load selector switch for a transformer, with a number of first contacts which are electrically insulated and fixed on a stationary support member and are arranged at a uniform distance from one another, with a normally open contact arrangement receiving Carrier and a pair of bridging contacts which are electrically connected by an impedance and are arranged such that when the normally open contact arrangement is in a stationary operating position is in electrical contact with any of the first contacts, on opposite ones Sides of the selected first contact are arranged, and that this when the movable support is relative to the fixed support member is moved to the movement of the normally open contact arrangement from its contact position with the chosen first contact and in KontaküstoiJung with an adjacent selected first contact to cause the selected first contacts to be bridged and maintaining an electrical bridging contact for at least the period of time when the normally open contact arrangement interrupts the electrical contact with the selected first contact until the TX) PY OBlGtNAL INSPECTED electrical contact is established with the selected first contact, thereby marked e t that die'Übrückungskontakte (18, 19) on a linkage (7) are mounted, which is received by the carrier (6), wherein the linkage (7) can be actuated in such a way that the disconnected position between the bridge contacts (18, 19) in the direction of movement (A) of the movable carrier (6) relative to the stationary one Support member (2) is changeable. 2. Load selector switch according to claim 1, characterized in that g e that the .Gestänge (7) a Biasing device (17) is assigned to press the bridge contacts (18, 19) against each other in a flexible manner, so that these occupy positions in which they are at a minimal distance from one another, the bridge contacts (18, 19) then in a minimal Are arranged at a distance from one another when the normally open contact arrangement (6) is in its stationary position Operating position is, the movement of the movable carrier (4) relative to the fixed support member (2) to move the normally open contact arrangement (6) out of its contact position with the selected first contact (3A) and bring into contact position with the selected first contact (3B), has the consequence that the rear Bridging contact is moved against the selected first contact (3A), which acts as a cam for actuating the Linkage (7) is used and the separation position between the bridging contacts (18, 19) against the yielding Preload increased by the preload device (17), whereby the prechsre bridging contact comes into contact position and cam contact with the selected first contact (3B). 3. Load selector switch according to claim 1 or 2, characterized in that the linkage (7) is a parallel linkage. COPY BATH ORIGINAL 4. LasLwahlschalLer according to claim J, characterized by y ο K e η η ζ c i c h η ο L that the parallel linkage (7) has first and second links (8, 9), which in the Near one of their ends to a fixed, first joint (10) are articulated to one another, as well third and fourth links (11, 12) each having first and second ends (11a, 12a and 11b, 12b) and between their ends on a movable, second joint (13) ycLonkig with each other like scissors are connected, the other ends of the first and second links (8 and 9) each articulated to the third and fourth links (11 and 12) near the first ends (11a, 12a) each at movable third and fourth joints (15 and 16) are connected, and the third and fourth links (11 and 12) in near their second ends (11b, 12b) different the bridge contacts (18, 19) wear. 5. Load selector switch according to claim 2 and 4, characterized in that the biasing device (17) a ■ between the third and fourth joint (15 and 16) arranged tension spring (17). 6. Load selector switch according to claim 4 or 5, characterized in that the carrier (4) with eine'Fleiteinrichtung (14) for guiding the movable second joint (13) and / or one or both of the movable third and fourth joints (15 and 16) is provided during the actuation of the parallel linkage (7). 7. Load selector switch according to claim 6, characterized in that the guide device (14) has one or more channels. 8. Load selector switch according to one of the preceding claims, characterized in that 'ORIGINAL INSPECTED COPV each bridging contact (18, 19) has a contact roller having. 9. Load selector switch according to one of the preceding claims, characterized in that that each first contact (3) has a cylindrical section which is designed as a driver and forms electrical contact with the bridging contacts (18, 19) during the switching operations. 10. Load selector switch according to claim 9, characterized in that the cylindrical Sections are fixed or rotatable. 11. Load selector switch according to one of the preceding Claims, characterized in that the impedance (20a, 20b) is tapped in the middle (center-tapped) reactance or resistance. 12. Load selector switch according to one of the preceding claims, characterized in that the first contacts (3) are arranged along a circumference, and that the carrier (4) around the center of the circle is rotatably arranged. 13. Load selector switch according to one of claims 1 to 11, characterized in that the first contacts (3) arranged along a straight line and the carrier can be moved parallel to the straight line ancjoorrinpt is ·.