EP0428168A2 - Isolator switch with safety operating device - Google Patents
Isolator switch with safety operating device Download PDFInfo
- Publication number
- EP0428168A2 EP0428168A2 EP90121877A EP90121877A EP0428168A2 EP 0428168 A2 EP0428168 A2 EP 0428168A2 EP 90121877 A EP90121877 A EP 90121877A EP 90121877 A EP90121877 A EP 90121877A EP 0428168 A2 EP0428168 A2 EP 0428168A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- operating device
- lever
- pin
- fixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/02—Housings; Casings; Bases; Mountings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/02—Housings; Casings; Bases; Mountings
- H01H71/0207—Mounting or assembling the different parts of the circuit breaker
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/36—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electromagnetic release and no other automatic release
- H01H73/42—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electromagnetic release and no other automatic release reset by rotatable knob or wheel
Abstract
Description
- This invention relates to an isolator switch with a safety operating device.
- Many types of manually operated isolator switches are known which under normal conditions properly perform their basic switching function but which sometimes in emergency situations have the drawback that their mechanical tripping system becomes locked. Another problem of known switches of this type is that the switch has to be completely disassembled to provide access to the tripping mechanism.
- An object of the present invention is to provide a switch comprising both a mechanical tripping system and a safety device associated with the mechanical system.
- A further object of the invention is to provide a casing in which the tripping mechanisms although protected are accessible with the casing assembled, both for emergency repair and for maintenance or parts replacement.
- These objects are attained according to the present invention by an isolator switch consisting essentially of a casing constructed in two halves, within which a multiple mobile contact element is housed, characterised in that one of said two halves further houses a mechanical operating device for said switch in a seat separate from said contact element, a coil being associated with said mechanical device for its safety tripping.
- The separate seat is accessible from the outside via at least one door.
- Preferably said seat is accessible via two doors, one provided in a position substantially corresponding with said mechanical operating device, and the other in a position substantially corresponding with said coil.
- Preferably according to the invention, said operating device is controlled by a shaft provided with a knob, said shaft passing centrally through said casing and said knob being positioned externally to said casing on the opposite side to said seat which houses the operating device and the safety tripping coil.
- According to a preferred embodiment of the present invention said operating device consists of a horizontally disposed profiled lever provided laterally with a pair of vertical profiled plates, said plates being provided at one end with slots engaging a fixed pin, a pair of springs being provided fixed to said fixed pin and to a crosspiece of said profiled lever, said crosspiece carrying a further spring disposed centrally to said pair and fixed to a fixed point, there being also provided a movable member controlled by said shaft and engaged with said profiled lever and with a mobile spring-loading element, said profiled lever also being provided at its free end with a tang engageable either with a coil or with a fixed pin.
- Again according to the invention said vertical profiled plates form the positioner for said operating device and define positions of said movable member, namely a switch open position, a switch closed position and a switch loaded position.
- In addition said movable member preferably consists of a U-piece with tapered free ends and fixed at one end to said control shaft and at its other end, via a pin, to said loading element.
- Said loading element consists of a pair of flat bars provided at one end with a slot movably engaging said pin of said U-piece, their other ends being bent outwards from said lever and pivoted on support bushes on the same axis as said control shaft but on the opposite side of said lever, said flat bars slidingly supporting a loading spring.
- The technical characteristics and further advantages of the present invention will be more apparent from the following description given by way of non-limiting illustration with reference to the accompanying drawings in which:
- Figure 1 is a partly sectional plan view of a switch according to the present invention in a first operating position;
- Figure 2 shows the elements of Figure 1 in a second operating position;
- Figure 3 shows the elements of Figure 1 in a third operating position; and
- Figure 4 is a section on the line IV-IV of Figure 1.
- In the figures the
reference numeral 11 indicates overall an isolator switch according to the present invention. Theswitch 11 consists of a casing constructed in two halves, or half-casings mobile contact element 14, the half-casing 13 being also provided with aseat 15 in which a mechanical operating device indicated overall by 16 and a trip orsafety opening coil 17 are provided. The half-casing 13 is also provided with acover 18 in whichdoors seat 15 without having to entirely disassemble theswitch 11. - The
operating device 16 is controlled by ashaft 21 provided with aknob 22 and passing centrally through the half-casings 12 and - The
knob 22 is provided on the opposite side of the casing to thecover 18. - With particular reference to Figures 1 to 3, the
operating device 16 consists essentially of a horizontally disposed profiledlever 23 provided laterally with a pair of vertical profiled lateral plates indicated overall by 24, said plates being provided at one end withslots 25 in sliding engagement with apin 26. Saidlateral plates 24 are also provided withstop teeth 45 and shapedguide portions springs 28 are fixed between thepin 26 and acrosspiece 27, afurther spring 29 being provided centrally between thesprings 28 and fixed to thecrosspiece 27 and to afixed point 30. There is also provided, in association with thelever 23, a movable member indicated overall by 31 and rotated by theshaft 21. - The
movable member 31 consists of aU-piece 32 having tapered free ends and fixed at one end to thecontrol shaft 21 and at its other end, via apin 33, to a mobile loading element indicated overall by 34. - The
mobile loading element 34 consists of a pair offlat bars 35 provided at one end with aslot 36 movably engaging thepin 33, while theirother ends 37 are bent and pivoted by means ofsupport bushes 38 on the same axis as thecontrol shaft 21 but on the opposite side of thelever 23. On the flat bars there is slidingly mounted aloading spring 39 engaged with the bent ends - 37 and with the
pin 33. Thelever 23 is also provided at its free end with aninclined tang 40 which can be moved by the action of aplunger 41 in acoil 17 positioned in its proximity, or be engaged during manual opening of the switch by a fixedpin 60 which progressively moves it upwards. Thecoil 17 can be energized from the outside when under emergency conditions, independently of the switch operation. - Figure 1 shows the switch of the invention when open, with the
movable member 31 and theloading element 34 shifted towards the profiledportion 46; theloading spring 39 is completely unloaded and thelever 23 is completely raised from thecoil 17 and itsplunger 41. - If the
shaft 21 is now rotated clockwise by the knob 22 (Figure 2), themovable member 31 and theloading element 34 move into proximity with theprofiled portion 47, so moving the switch into its closed position in this manner. - An anticlockwise half turn of the shaft 21 (Figure 3) is required to complete the closure of the switch and thus put it into its loaded state. In Figure 3 the
movable member 31 has itspin 33 engaged with thetooth 45 of thelever 23, and thespring 39 retained by it is loaded. - In this configuration the
lever 23 is lowered with thetang 40 in contact with thecoil plunger 41, themobile contact element 14 closes its contacts (not shown) and the position of thepin 33 has shifted to the left of the line joining the axis of rotation of themovable member 31 and theloading element 34, the reaction of thespring 28 being sufficient when in this position to balance the action of theloading spring 39 and prevent the movable member tripping into the open position. - The
spring 28 is assisted by thespring 29 the purpose of which is to keep thelever 23 and in particular thetooth 45 in contact with thepin 33 of the movable member. - The switch can be opened either manually by turning the knob anticlockwise (with respect to the figures) to return the switch to the position of Figure 1, or, if the shaft is locked or in any other abnormal or emergency situation, by the action of the
coil 17, which forces the plunger upwards to shift thelever 23 so that the pin is released from thetooth 45 and themovable member 31 andloading element 34 are able to trip towards theportion 46. - In the case of manual opening, on rotating the
shaft 21 thepin 33 engaged in thetooth 45 urges the lever towards the left to bring thetang 40 into contact with thepin 60. It should be noted that thelever 23 is able to move towards the left because of the slot engaged with thepin 26. - During the opening movement the fixed
pin 60 lifts thelever 23 and thus allows disengagement between thepin 33 andtooth 45, so enabling the switch to open.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2240389 | 1989-11-16 | ||
IT02240389A IT1237775B (en) | 1989-11-16 | 1989-11-16 | SWITCH DISCONNECTOR WITH SAFETY OPERATING DEVICE. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0428168A2 true EP0428168A2 (en) | 1991-05-22 |
EP0428168A3 EP0428168A3 (en) | 1992-10-14 |
EP0428168B1 EP0428168B1 (en) | 1997-05-21 |
Family
ID=11195839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90121877A Expired - Lifetime EP0428168B1 (en) | 1989-11-16 | 1990-11-15 | Isolator switch with safety operating device |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0428168B1 (en) |
AT (1) | ATE153477T1 (en) |
DE (1) | DE69030760T2 (en) |
DK (1) | DK0428168T3 (en) |
ES (1) | ES2103717T3 (en) |
IT (1) | IT1237775B (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1740911A (en) * | 1927-06-16 | 1929-12-24 | David L Whetstone | Circuit breaker |
US1872122A (en) * | 1922-12-04 | 1932-08-16 | Westinghouse Electric & Mfg Co | Electric switch |
FR2268346A1 (en) * | 1974-04-19 | 1975-11-14 | Elektra Tailfingen | Low voltage cut-off switch for electric motor - has lever system controlled by electromagnet and switching shaft |
EP0080687A1 (en) * | 1981-11-26 | 1983-06-08 | CGEE ALSTHOM Société anonyme dite: | Rotary operated electric switch with automatic return in the case of voltage failure |
-
1989
- 1989-11-16 IT IT02240389A patent/IT1237775B/en active IP Right Grant
-
1990
- 1990-11-15 DE DE69030760T patent/DE69030760T2/en not_active Expired - Fee Related
- 1990-11-15 ES ES90121877T patent/ES2103717T3/en not_active Expired - Lifetime
- 1990-11-15 EP EP90121877A patent/EP0428168B1/en not_active Expired - Lifetime
- 1990-11-15 DK DK90121877.6T patent/DK0428168T3/en active
- 1990-11-15 AT AT90121877T patent/ATE153477T1/en active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1872122A (en) * | 1922-12-04 | 1932-08-16 | Westinghouse Electric & Mfg Co | Electric switch |
US1740911A (en) * | 1927-06-16 | 1929-12-24 | David L Whetstone | Circuit breaker |
FR2268346A1 (en) * | 1974-04-19 | 1975-11-14 | Elektra Tailfingen | Low voltage cut-off switch for electric motor - has lever system controlled by electromagnet and switching shaft |
EP0080687A1 (en) * | 1981-11-26 | 1983-06-08 | CGEE ALSTHOM Société anonyme dite: | Rotary operated electric switch with automatic return in the case of voltage failure |
Also Published As
Publication number | Publication date |
---|---|
DE69030760T2 (en) | 1997-12-18 |
DK0428168T3 (en) | 1997-11-24 |
IT1237775B (en) | 1993-06-17 |
DE69030760D1 (en) | 1997-06-26 |
ES2103717T3 (en) | 1997-10-01 |
EP0428168A3 (en) | 1992-10-14 |
IT8922403A0 (en) | 1989-11-16 |
EP0428168B1 (en) | 1997-05-21 |
ATE153477T1 (en) | 1997-06-15 |
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