US3858016A - Spring-loaded snap-action stepping-switch-operating mechanism - Google Patents

Spring-loaded snap-action stepping-switch-operating mechanism Download PDF

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Publication number
US3858016A
US3858016A US00398128A US39812873A US3858016A US 3858016 A US3858016 A US 3858016A US 00398128 A US00398128 A US 00398128A US 39812873 A US39812873 A US 39812873A US 3858016 A US3858016 A US 3858016A
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pair
spring
crankshaft
stepping
latch
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US00398128A
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E Baumgartner
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0027—Operating mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/44—Driving mechanisms, i.e. for transmitting driving force to the contacts using Geneva movement

Definitions

  • a spring-loaded snap-action stepping-switch-operating mechanism includes a Geneva gear drive for loading a spring motor and also includes latch means for the spring of said motor automatically releasable when said spring is fully loaded and a step action thereof is desired,
  • a novel arrangement of parts makes the mechanism compact and makes it possible to easil assemble, disassemble and service the same.
  • the present invention relates to spring-loaded snapaction stepping-switch-operating mechanism, as applied in electrical power engineering to operate Jansen type transfer switches for tap-changing power transformers, or to operate power change-over switches.
  • Jansen type transfer switches for load tap changers for regulating transformers are well known in the art.
  • One such transfer switch and the parts which are associated with it are disclosed in US. Pat. No. 3,176,089 to A. Bleibtreu et al., Mar.
  • SteppingPswitch-operating mechanisms embodying this invention include a pair of spring-supporting levers which are arranged cross-wise and pivotable about a common shaft. Each of these spring supporting levers has a pair of lever arms. Such mechanisms further include a pair of springs each affixed with the ends thereof to one of said pair of lever arms of each of said pair of spring-supporting levers. The mechanisms further include a spring-loaded crank-shaft operable by a Geneva gear drive and having axial extensions cooperating with one of said pair of spring-supporting levers for pivoting said one of said pair of spring-supporting levers to load said pair of springs.
  • Mechanisms embodying this invention further include a pivotable stepping crankshaft having axial extensions cooperating with the other of said pair of spring-supporting levers to cause said pair of springs when expanding to impart a pivotal motion to said stepping crankshaft.
  • a latch mechanism locks said stepping crankshaft in position against the bias of said pair of springs.
  • the springloading crankshaft includes means for unlatching said latch mechanism to allow said pair of springs to impart said pivotal motion to said stepping crankshaft.
  • FIG. 1 is a vertical section of a mechanism embodying the present invention
  • FIG. 2 is a vertical section of the mechanism shown in FIG. 1 taken along lI--II of FIG. 1;
  • FIGS. 35 are diagrammatic exploded top plan views of the mechanism shown in FIGS. 1 and 2 in three different operating positions.
  • FIGS. 1 and 2 DESCRIPTION OF PREFERRED EMBODIMENT
  • reference numeral 1 has been applied to indicate a base plate of a housing structure
  • reference numeral 2 has been applied to indicate the cover plate of the housing structure.
  • Plates 1 and 2 define a space for the constituent parts of the mechanism embodying this invention, and they also form bearings la, 2a for the constituent shafts 7, 10 of the mechanism embodying this invention.
  • Cover plate 2 is provided with a lateral projection or flange forming a bearing 3 for driving shaft 4.
  • Driving shaft 4 supports a crankshaft 5 having a radially outer end which supports roller 21. The latter engages recesses 6a in a Geneva gear 6.
  • Geneva gear 6 is supported by shaft 7 resting in bearing 2a formed by cover plate 2.
  • the springloading crankshaft 8 is also mounted on shaft 7 in such a fashion that Geneva gear 6 and crankshaft 8 moves simultaneously. This may be achieved by pinning both Geneva gear 6 and crankshaft 8 to shaft 7.
  • the driven or stepping shaft 10 is arranged in coaxial relation to shaft 7, and below the latter and shaft 10 is supported by bearing 1a formed by base plate 1.
  • the stepping crankshaft 9 may form an integral part of shaft 10 as shown in FIG. 1 or be fixedly mounted upon shaft 10. It will be apparent from the above that stepping crankshaft 9 is arranged at a lower level than springloading crankshaft 8.
  • a pair of spring-supporting levers 11, 12 is arranged between spring-loading crankshaft 8 and stepping crankshaft 9.
  • Each of levers 11 and 12 has two arms extending in opposite directions and both levers l1, 12 are arranged cross-wise and are pivotally mounted on shaft 7.
  • reference numerals 111 and 112 have been applied to indicate the ends of lever 11, and reference numerals 121 and 122 have been applied to indicate the ends of lever 12.
  • the ends 111 and 121 are tied together by compression spring 14, and the ends 112 and 122 are tied together by compression spring 13.
  • the spring-loading crankshaft 8 has two axially extending projections 81 and 82 which enter into the gaps formed by the arms of levers 11 and 12.
  • stepping crankshaft 9 has two axially extending projections 91, 92 which enter into the gaps formed by the arm of levers l1 and 12.
  • Reference numeral 15 has been applied to indicate a gear segment which is arranged between base plate 1 and cover plate 2 at the same level as the arm of crankshaft 9.
  • Gear segment 15 is provided with recesses 151 at the radially inner side thereof intended to receive slide latch 16.
  • the number of recesses 151 in gear segment 15 is equal to the number of steps or operating positions which the mechanism is intended to have. It will be apparent from FIGS. 3 to 5 that gear segment 15 is arranged in coaxial relation to shaft 10 and radially outwardly from stepping crankshaft 9, while FIGS.
  • gear segment 15 is arranged at the same level as the arm of stepping crankshaft 9.
  • Slide latch 16 is capable of engaging with the radially outer end thereof each of the recesses in gear segment 15.
  • slide latch 15 is spring biased radially outwardly by means of a spring 17 whose radially outer end engages slide latch 16, and whose radially inner end rests against stepping crankshaft 9.
  • Slide latch 16 can be moved radially inwardly against the bias of spring 17 by means of two operating levers l9 and 20 pivotally supported on the arm of stepping crankshaft 9.
  • the aforementioned projections 81, 82 of spring-loading crankshaft 8 cooperate with levers 19 and 20 to move slide latch 16 radially inwardly against the bias of spring 17.
  • lever 19 is arranged in the path of part 81 and lever 20 is arranged in the path of part 82.
  • FIG. 3 shows an initial or rest position of the mechanism.
  • shaft 4 In order to perform a stepping operating driving shaft 4 is operated by motor means which have not been shown in the drawings. It may be assumed that the direction of operation is counterclockwise as indicated in FIG. 4 by an arrowhead, and that the angle of rotation of shaft 4 is 360. As a result, the roller 21 engages one of the recesses 6a in Geneva gear 6 and moves or pivots Geneva gear 6 a predetermined angle. Since spring-loading crankshaft 8 is fixedly mounted on the same shaft 7 as Geneva gear 6, spring-loading crankshaft 8 is moved or pivoted the same angle as Geneva gear 6.
  • spring-loading crankshaft 8 causes it projections 81 and 82 to act upon lever 11, pivoting the latter around shaft 7 in clockwise direction as shown in FIG. 3. Since the lever 12 is maintained in position by the projections 91 and 92 of stepping crankshaft 9, which in turn, is maintained in position on account of the fact that slide latch 16 is in engagement with one of the recesses 151 of gear segment 15, the movement of lever 11 relative to lever 12 causes loading, or compression, of compression springs 13 and 14. During the last phase of the pivotal motion of Geneva gear 6 and of spring-loading crankshaft 8 the projection 81 of the latter engages one end of lever 19, thus compelling radial inward movement of slide latch or locking lever 16 against the bias of spring 17.
  • stepping crankshaft 9 is no longer fixedly held in position, but is operated by springs 13 and 14 by the intermediary of lever 12 acting upon axially extending projections or abutments 91, 92 which form integral parts of stepping crankshaft 9.
  • stepping crankshaft 9 is caused to snap from the position shown in FIGS. 3 and 4 to the position shown in FIG. 5.
  • This snap motion is transmitted from stepping crankshaft 9 to driving shaft 10 upon which stepping crankshaft 9 is fixedly mounted.
  • the driving shaft 10 operates the movable contacts of a switching device which has not been shown in the drawings.
  • One operating step has been completed when the crank mechanism 4, for operating the Geneva gear 6 has returned to its initial position, as shown in FIG. 5.
  • crankshaft mechanism 4, 5 for each step of driving shaft does not necessarily have to be 360. It will be further understood that in the embodiment of the invention shown the motion of shaft 4 per step of shaft 10 needs to-be but 180 if crankshaft 4, 5 is provided with two arms angularly displaced l80 of which each has a Geneva-gear-engaging roller 21 at the radially outer end thereof.
  • the number of recesses in the Geneva gear 6 depends upon the snap'action stepping operation which is desired. Considering the operation of a load changeover switch having but two limit positions, the number of recesses 6a in Geneva gear 6 would be reduced to 2. In that particular instance the number of recesses 151 in gear segment 15 would likewise be reduced to 2.
  • the spring stepping mechanism embodying this invention is simpler, less expensive, and more compact than comparable prior art devices.
  • the springs 13 and 14 are readily accessible, and the assembley of the structure is easy and requires little time.
  • the accessibility of springs 12 and 13 is important because it makes it possible to replace these springs without disassembling the entire mechanism.
  • the dual arrangement of projections 81 and 82 and of projections 91,92 minimize friction in the bearings of the structure. Since the Geneva gear 6 is arranged ahead of the spring motor means 13, 14 seen in the direction from the driving shaft 4 to the driven shaft 10 the distance between the driven contacts of a switch to be operated in discrete steps and that of the switch-operating springs is minimized with attendent increase of the efficiency of the drive. It should also be noted that the Geneva gear 6 is maintained in its various positions of rest by springs 13, 14, i.e. there is no need for providing additional means for arresting Geneva gear 6 in its positions of rest.
  • a spring-loaded snap-action stepping-switchoperating mechanism including a. a pair of spring-supporting levers (ll, 12) arranged cross-wise, pivotable about a common shaft and each having a pair of lever arms;
  • a pivotable spring-loading crankshaft (8) operable by a Geneva gear drive (4, 5, 6) and having axial extensions (81, 82) cooperating with one of said pair of spring-supporting levers (11, 12) for pivoting said one of said pair of spring-supporting levers to load said pair of springs (l3, 14);
  • a pivotable stepping crankshaft (9) having axial extensions (91, 92) cooperating with the other of said pair of spring-supporting levers (11, 12) to cause said pair of springs (13, 14) when expanding to impart a pivotal motion to said stepping crankshaft;
  • a latch mechanism (15, 16, 17, 19, 20) for latching said stepping crankshaft (9) in position against the bias of said pair of springs (ll, 12);
  • said latch mechanism (15, 16, l7, 19, 20) includes a radially outwardly spring-biased latch member (16) supported by said stepping crankshaft (9) and a gear segment arranged in coaxial relation to said stepping crankshaft (9) and having recesses (151) engaged by the radially outer end of said latch member (16).
  • a switch-operating mechanism as specified in claim 1 wherein said spring-loading crankshaft (8) is arranged at a level above said pair of spring-supporting levers (ll, 12) and above said pair of springs (13, 14), said stepping crankshaft (9) is arranged at a level below said pair of spring-supporting levers (11, 12) and below said pair of springs (13, 14) said spring-loading crankshaft being provided with axially downwardly extending projections (81, 82) forming abutments cooperating with one of said pair of spring-supporting levers (ll, 12) for loading said pair of springs (13, 14), said stepping crankshaft (9) being provided with axially upwardly extending projections (91, 92) forming abutments cooperating with the other of said pair of springsupporting levers (11, 12) for joint motion with said other of said pair of spring-supporting levers under the action of said pair of springs (13, 14).
  • a switch-operating mechanism a specified in claim 5 wherein said latch mechanism (15, 16, 17, 19, is arranged in the path of travel of said downwardly extending projections (81, 82) of said spring-loading crankshaft (8) to cause unlatching thereof at the end of pivotal motions of said spring-loading crankshaft (8).
  • a switch-operating mechanism as specified in claim 1 including a housing (1, 2) for said pair of spring-supporting levers (11, 12) said pair of springs (13, 14) said spring-loading crankshaft (8) and said stepping crankshaft (9), said housing (1,2) forming bearings (10, 2a) for said spring-loading crankshaft (8) and said stepping crankshaft (9) and having a lateral bracket forming a bearing (3) for an additional crankshaft (4, 5) operating a Geneva gear arranged outside and housing (1, 2) in coaxial relation to said springloading crankshaft (8) and said stepping crankshaft (9).
  • a spring-loaded snap-action stepping-switchoperating mechanism including a. a pair of spring-supporting levers (ll, 12) arranged crosswise, pivotable about a common shaft and each having a pair of lever arms;
  • a pair of pivotable crankshafts (8, 9) arranged in coaxial relation to said common shaft, the arms of each of said pair of crankshafts (8, 9) being arranged to opposite sides of' said pair of springsupporting levers (11, 12) and sandwiching said spring-supporting levers (11, 12) each of said arms of each of said pair of crankshafts (8, 9) having a pair of axially extending projections (81, 82; 91, 92) forming abutments for cooperatively engaging said pair of spring-supporting levers (11, 12);
  • a Geneva gear drive (4, 5, 6) for operating one of said pair of crankshafts including a Geneva gear (6) arranged in coaxial relation to said one of said pair of crankshafts (8, 9) and e. a latch mechanism for maintaining the other of said pair of crankshafts (8, 9) in angularly displaced positions, said latch mechanism including a pair of latch operating levers (19, 20) pivotally supported by the arm of said other of said pair of crankshafts (8, 9), and each of said pair of latchoperating levers (19, 20) being arranged in the path of movement of one of said pair of axially extending projections (81, 82) of said one of said pair of crankshafts (8, 9).
  • a switch-operating mechanism as specified in claim 9 including a base plate (1) and a cover plate (2) forming bearings (1a, 2a) for said pair of crankshafts (8, 9) said Geneva gear (6) being arranged on the outside of said cover plate (2), and said cover plate forming a bearing (3) for an additional crank mechanism (4, 5, 21) engaging recesses (6a) in said Geneva gear (6) for driving said Geneva gear in discrete consecutive steps.
  • said latch mechanism includes a fixed gear segment (15) arranged in coaxial relation to said pair of crankshafts (8, 9) and having recesses (151) at the radially inner side thereof, a spring biased latch (16) slidably supported by said other of said pair of crankshafts 8, 9) and having a radially outer end for engaging said recesses (151) in said gear segment (15), I
  • each of said pair of latch operating levers (19, 20) has a pair of arms, one of said pair of arms being adapted to engage said latch to move said latch radially inwardly against said spring bias thereof and the other of said pair of arms of each of said pair of latch-operating levers (19, 20) being arranged in the path of movement of one of said axially extending projections (81, 82) of said one of said pair of crankshafts (8, 9).

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US00398128A 1972-10-13 1973-09-17 Spring-loaded snap-action stepping-switch-operating mechanism Expired - Lifetime US3858016A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2250260A DE2250260C3 (de) 1972-10-13 1972-10-13 Kraftspeicherantrieb für Lastumschalter und Lastwähler

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US3858016A true US3858016A (en) 1974-12-31

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US00398128A Expired - Lifetime US3858016A (en) 1972-10-13 1973-09-17 Spring-loaded snap-action stepping-switch-operating mechanism

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US (1) US3858016A (enrdf_load_stackoverflow)
JP (1) JPS504525A (enrdf_load_stackoverflow)
AT (1) AT325160B (enrdf_load_stackoverflow)
AU (1) AU6110773A (enrdf_load_stackoverflow)
CA (1) CA987134A (enrdf_load_stackoverflow)
DE (1) DE2250260C3 (enrdf_load_stackoverflow)
FR (1) FR2203152A1 (enrdf_load_stackoverflow)
GB (1) GB1423618A (enrdf_load_stackoverflow)
NL (1) NL7314051A (enrdf_load_stackoverflow)
SE (1) SE384758B (enrdf_load_stackoverflow)
SU (1) SU502618A3 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106057520A (zh) * 2016-07-28 2016-10-26 许继集团有限公司 一种转动输出装置及使用该装置的开关柜操作机构
EP3989251A1 (en) * 2020-10-21 2022-04-27 Hitachi Energy Switzerland AG Switching system for an on-load tap changer, on-load tap changer and method for switching a tap connection of an on-load tap changer

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2649247C2 (de) * 1976-10-29 1983-10-06 Maschinenfabrik Reinhausen Gebrueder Scheubeck Gmbh & Co Kg, 8400 Regensburg Lastwähler für Stufentransformatoren
DE2845463C3 (de) * 1978-10-19 1982-02-25 Maschinenfabrik Reinhausen Gebrüder Scheubeck GmbH & Co KG, 8400 Regensburg Lastwähler für Stufentransformatoren
DE3938207A1 (de) * 1989-11-17 1991-05-23 Reinhausen Maschf Scheubeck Kraftspeicherantrieb fuer lastumschalter von stufenschaltern in stufentransformatoren
DE4034126C1 (enrdf_load_stackoverflow) * 1990-10-26 1992-03-05 Maschinenfabrik Reinhausen Gmbh, 8400 Regensburg, De
GB2457079A (en) * 2008-02-01 2009-08-05 Brush Transformers Ltd On-load tap changer
DE102011008688B3 (de) * 2011-01-15 2012-01-26 Maschinenfabrik Reinhausen Gmbh Kraftspeicher

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315043A (en) * 1965-07-13 1967-04-18 Reinhausen Maschf Scheubeck Transfer switch for tap changing regulating transformers including a contact support for the fixed contacts having no creepage path
US3485965A (en) * 1966-10-14 1969-12-23 Reinhausen Maschf Scheubeck Selector switch for regulating transformers
US3597559A (en) * 1968-10-02 1971-08-03 Smit Nijemgen Electrotechnisch Geneva gear sectors mounted on a common shaft for the stepwise rotation of the switching contacts of rotary switches

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315043A (en) * 1965-07-13 1967-04-18 Reinhausen Maschf Scheubeck Transfer switch for tap changing regulating transformers including a contact support for the fixed contacts having no creepage path
US3485965A (en) * 1966-10-14 1969-12-23 Reinhausen Maschf Scheubeck Selector switch for regulating transformers
US3597559A (en) * 1968-10-02 1971-08-03 Smit Nijemgen Electrotechnisch Geneva gear sectors mounted on a common shaft for the stepwise rotation of the switching contacts of rotary switches

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106057520A (zh) * 2016-07-28 2016-10-26 许继集团有限公司 一种转动输出装置及使用该装置的开关柜操作机构
CN106057520B (zh) * 2016-07-28 2019-01-11 许继集团有限公司 一种转动输出装置及使用该装置的开关柜操作机构
EP3989251A1 (en) * 2020-10-21 2022-04-27 Hitachi Energy Switzerland AG Switching system for an on-load tap changer, on-load tap changer and method for switching a tap connection of an on-load tap changer
WO2022083902A1 (en) * 2020-10-21 2022-04-28 Hitachi Energy Switzerland Ag Switching system for an on-load tap changer, on-load tap changer and method for switching a tap connection of an on-load tap changer
KR20230047220A (ko) * 2020-10-21 2023-04-06 히타치 에너지 스위처랜드 아게 부하시 탭 절환기용 스위칭 시스템, 부하시 탭 절환기 및 부하시 탭 절환기의 탭 연결을 스위칭하는 방법
CN116057657A (zh) * 2020-10-21 2023-05-02 日立能源瑞士股份公司 用于有载分接开关的切换系统、有载分接开关和切换有载分接开关的分接头连接的方法
US20230230781A1 (en) * 2020-10-21 2023-07-20 Hitachi Energy Switzerland Ag Switching system for an on-load tap changer, on-load tap changer and method for switching a tap connection of an on-load tap changer
CN116057657B (zh) * 2020-10-21 2024-03-08 日立能源有限公司 用于有载分接开关的切换系统、有载分接开关和切换有载分接开关的分接头连接的方法
US12033825B2 (en) * 2020-10-21 2024-07-09 Hitachi Energy Ltd Switching system for an on-load tap changer, on-load tap changer and method for switching a tap connection of an on-load tap changer

Also Published As

Publication number Publication date
AT325160B (de) 1975-10-10
SU502618A3 (ru) 1976-02-05
NL7314051A (enrdf_load_stackoverflow) 1974-04-16
CA987134A (en) 1976-04-13
SE384758B (sv) 1976-05-17
AU6110773A (en) 1975-04-10
GB1423618A (en) 1976-02-04
FR2203152A1 (enrdf_load_stackoverflow) 1974-05-10
JPS504525A (enrdf_load_stackoverflow) 1975-01-17
DE2250260B2 (de) 1975-03-13
DE2250260C3 (de) 1975-10-23
DE2250260A1 (de) 1974-04-25

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