EP2202770B1 - Dispositif de commutation bistable de câble - Google Patents
Dispositif de commutation bistable de câble Download PDFInfo
- Publication number
- EP2202770B1 EP2202770B1 EP20090007766 EP09007766A EP2202770B1 EP 2202770 B1 EP2202770 B1 EP 2202770B1 EP 20090007766 EP20090007766 EP 20090007766 EP 09007766 A EP09007766 A EP 09007766A EP 2202770 B1 EP2202770 B1 EP 2202770B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- actuator
- commutation
- rope
- switch
- unit
- 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.)
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- 238000005755 formation reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H17/00—Switches having flexible operating part adapted only for pulling, e.g. cord, chain
- H01H17/16—Switches having flexible operating part adapted only for pulling, e.g. cord, chain having a single flexible operating part adapted for pulling at one end only
- H01H17/165—Switches having flexible operating part adapted only for pulling, e.g. cord, chain having a single flexible operating part adapted for pulling at one end only secured to a part of the switch mechanism that has only rectilinear movement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
- H01H13/56—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state upon the next application of operating force
- H01H13/58—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state upon the next application of operating force with contact-driving member rotated step-wise in one direction
Definitions
- the present invention generally finds application in the field of safety electric devices and particularly relates to a rope-operated commutation device having bistable operation for use with safety or emergency electric circuits.
- Devices used for bistable switching of electric contacts by rope or pull cord operation are known to comprise a manual switch associated with a bistable relay.
- an electric load is switched into open/closed circuit conditions by controlling a switch via appropriate mechanisms, whereas the relay is used to hold the switch in an intermediate electrically switched contact position, to allow or bypass circuit operation.
- These devices are used, for instance, to turn on and off emergency lights in a hoistway, during inspection and/or maintenance.
- bistable commutation devices have been devised, such as those disclosed in GB87969 and GB2176940 , in which the electric load is switched and the condition of electric contacts is maintained by the use of a commutation unit consisting of a single control mechanism, such as a lever system or relatively rotating cylindrical bodies.
- GB2154369 discloses a rope operated switch having all the features of the preamble of claim 1, wherein an actuator is provided which comprises a slider adapted to translate during operation.
- the object of the present invention is to overcome the above drawbacks, by providing a rope-operated bistable commutation device that is highly efficient and relatively cost-effective.
- a particular object is to provide a rope-operated bistable commutation device that allows simple replacement of one or more of its components, without requiring the replacement of the whole switch if only some of its components need to be replaced.
- a further object is to provide a commutation device that allows simple and quick installation and requires no wiring or other premilinary complex operations.
- Yet another object is to provide a commutation device that is composed of a relatively small number of components for simple and inexpensive production.
- a rope-operated bistable commutation device in accordance with claim 1, comprising a box-like body for housing at least one switch designed for connection to an electric circuit for selective opening/closing thereof, a commutation unit operably associated with said switch to promote commutation thereof between a first closed circuit condition and a second open circuit condition.
- the commutation unit comprises an actuator designed to be associated with an actuating rope and means for guiding said actuator between a first stable operative position and a second stable operative position corresponding to said first and second circuit conditions.
- the unit is removably connected to the box-like body, locking means being provided for holding constantly assembled the unit with the actuator into either said first or in said second stable operative position.
- the guide means comprise a slider rotatably mounted on said actuator for axially sliding into said cavity and provided on its outer side surface with at least one radial projection, and at least one pair of helical guide surfaces in axially mutually offset relationship to define a substantially helical guide path for the at least one radial projection.
- the commutation unit is removably connected to the box-like body, locking means being provided for holding said commutation unit constantly assembled with said actuator set in either said first or said second stable operating position to allow one-piece removal thereof from said box-like body.
- the whole commutation unit may be removed as a one piece from the first box-like body that houses the switch, while maintaining it assembled and ready for use.
- the commutation unit may be used in any switch-housing body thereby affording bistable operation of the whole device, even when the switch body has not been specially designed for the special commutation unit.
- the term "bistable operation" concerning the commutation unit is clearly intended to indicate the possibility for the unit to switch or commutate between a first operating condition and a second operating condition, and be locked in the set condition until the next actuation by a user.
- a commutation device of the invention may be used in all the systems that require bistable switching of an electric circuit.
- the device 1 may be used in an industrial or service system, for instance a lift car control system, for actuating the lighting system located in the hoistway.
- an industrial or service system for instance a lift car control system, for actuating the lighting system located in the hoistway.
- the device 1 is designed to be connected to a rope F, a pull cord or any other similar member, for manual or automatic actuation, possibly from a remote location, as exemplified in Fig. 1 .
- a rope-operated commutation device 1 comprises a first box-like body 2, with at least one switch, diagrammatically shown in the figures and designated by numeral 3, which is designed to be connected to at least one electric circuit, not shown.
- the switch 3 will not be disclosed herein in detail, as it may be designed with typical configurations.
- at least one movable contact will be provided, for interaction with at least one stationary contact designed to be connected to the electric circuit for commutating an electric load.
- the switch 3 may be switched between a first condition, in which the electric circuit is closed and a second reversed open circuit condition.
- the device 1 may be used for bistable circuit commutation between two distinct electric circuits, e.g. a primary circuit and an auxiliary circuit of the electric system being served.
- the switch 3 may include at least one pair of stationary contacts designed to be connected to the terminals of the main circuit and the secondary circuit respectively, and at least one movable contact that may be selectively and alternately moved to contact with one of the stationary contacts of the pair.
- the switch 3 may be switched between a first condition, in which the main circuit is closed and the secondary circuit is open, and a second reversed condition.
- the device 1 of the invention further comprises a bistable commutation unit, generally designated by numeral 4, which is operably associated with the switch 3 to promote commutation thereof between the open and closed circuit conditions.
- the commutation unit 4 essentially comprises an actuator 5 designed to be associated with an actuating rope F and means 6 for guiding the actuator 5 between a first stable operating position A and a second stable operating position B in which the switch is held in the open and closed conditions respectively.
- the switching unit 4 is removably connected to the box-like body 2.
- Locking means 7 are further provided for locking the switching unit 4, which are susceptible of holding it constantly assembled in the first A or second B position.
- the whole switching unit 4 may be removed from the box-like body 2 as a one piece, while holding it assembled and ready for installation, possibly to a box-like body 2', 2" other than the first body 2, as schematically shown in Fig. 3 .
- the box-like bodies 2, 2', 2" may have respective switches 3, 3', 3", not necessarily of identical types.
- the locking means 7 may include a hollow head 8 in which the bistable commutation unit 4 is accommodated, having a portion 9 for removable attachment thereof to the box-like body 2.
- the head 8 may have a substantially prismatic or cylindrical shape, with upper and lower end portions 10, 11 and a central portion 12, separable from each other for simpler assembly of the commutation unit 4.
- the head 8 may be also equipped with seals, not shown, to prevent the ingress of water or other particles therein.
- the various portions 10, 11 and 12 of the head 8 may be held in assembled relation by any kind of coupling arrangement.
- the head 8 may have a first series of peripheral through holes 13, four in the illustrated embodiment, which extend throughout the head 8 in an axial direction at its peripheral attachment portion 9.
- the holes 13 of the first series may be aligned with corresponding axial holes 14 of a second series, that are formed on the top face 15 of the box-like body 2.
- Removable attachment of the bistable commutation unit 4, which is held assembled with the head 2 may be obtained by screws 16, pins or similar means.
- the cavity 17 defined within the head 8 may have a substantially cylindrical shape with a side surface 18 defining a longitudinal axis L.
- the cavity 17 may be configured and appropriately sized to accommodate and radially retained the whole commutation unit 4, as shown in Fig. 2 .
- the guide means 6 may operate in a substantially axial direction, i.e. be designed to guide the actuator 5 between the first A and the second B stable positions along the longitudinal axis L.
- the actuator 5 will run a first axial stroke c 1 from bottom to top and then a second stroke c 2 from top to bottom.
- the guide means 6 may be designed for the commutation unit 4 to always switch from the first A to the second B stable positions during the first axial stroke c 1 of the actuator 5.
- Figs. 5 and 6 show a preferred, non limiting configuration of the guide means 6 that are part of the switching unit 4.
- the guide means 6 include a substantially cylindrical and tubular slider 19 disposed within the cavity 17.
- the slider 19 may be rotatably mounted to the actuator 5 and be able to axially slide within the cavity 17.
- the actuator 5 will be integrated with the slider 19 during axial translation by special radial flanges 20, 21 of the actuator 5 or equivalent means, such as O-rings or similar joints.
- the actuator 5 may have a substantially cylindrical shape and include a lower portion 22 designed for interaction with the switch 3, and an upper portion 23 designed for attachment to the actuation rope F as is known in the art.
- the lower portion 22 of the actuator 5 may have such a size as to fit into a passage 24 formed in the box-like body 2, for interaction with the switch 3.
- the upper portion 23 may have a radially enlarged end 25 defining a step 26 that projects radially from the rest of the body of the cylindrical actuator 5 and has an eyelet 27 for attachment of one end of the actuation rope F.
- the device 1 may have any orientation in space, without departure from the scope of the present invention.
- One or more radial projections 29, preferably directed outwards, may be provided on the lateral surface 28 of the slider 19.
- the slider 19 has four identical and equally angularly spaced projections 29, that may be located at the bottom of the slider 19, to ensure balanced orientation and smooth motion of the actuator 5.
- the guide means 6 may include at least a pair of axially offset helical surfaces, to define an upper helical surface 30 and a lower helical surface 31.
- Such helical surfaces 30, 31 may define a substantially helical guide path therein, for the radial projections 29 of the slider 19.
- one or more substantially similar and equally angularly spaced peripheral tooth-like formations 32 may be provided in the cavity 17 of the head 8, at its lower portion 11, to define a plurality of substantially axial peripheral grooves 33.
- Each tooth-like formation 32 may have a pair of lower helical surfaces 31, 31' with a predetermined pitch.
- the lower helical surfaces 31, 31' may face towards respective upper helical surfaces 30, 30' associated with the median portion 12 of the head 8.
- the locking means 7 may include one or more substantially transverse lower abutment surfaces 34 which end with respective lower helical surfaces 31.
- the lower abutment surfaces 34 may be interposed between two lower helical guide surfaces 31, 31', which are connected to the other helical surface 31' by an axial section 35, thereby forming a concavity adapted to receive the projections 29 of the slider 19 and stop the downward axial sliding motion thereof.
- the upper guide surfaces 30, 30' may be connected together by axial sections 36, defining additional concavities adapted to stop upward axial translation of the slider 19, and the actuator 5 that translates integral therewith.
- the pitches of the helices defined by the guide surfaces 30, 30'; 31, 31' of one pair may be different each other and selected according to the axial and angular stroke to be imparted to the slider 19 for any single actuation.
- full work cycle is intended to indicate the passage of the commutation unit 4 from the first to the second operating positions and back.
- the locking means 7 may further have a substantially transverse upper abutment surface 37, which is adapted to interact with the enlarged end 25 of the upper portion 23 of the actuator 5 to stop its downward axial translation.
- the upper abutment surface 37 may have a substantially annular shape and define the top face of the head 8.
- it may have a central opening 38 of a diameter large enough to allow the cylindrical actuator 5 to partially fit therein, but smaller than the diameter of the enlarged end 25.
- An elastic return element 39 with a first end 40 operating on the upper abutment surface 37 and a second end 41 operating on the projections 29 of the slider 19, may be fitted on the periphery of the actuator 5, at its central portion 12.
- the elastic element 39 will displace the projections 29 of the slider 19 from one of the upper helical surfaces 30, 30' to the corresponding lower helical surface 31, 31' or into one of the axial grooves 33, according to the starting position A, B, as the actuator 5 is pulled by the rope F. Furthermore, its elastic action will counteract the pulling action exerted by the rope F.
- the elastic element 39 may be a helical spring, whose end turns are engaged in respective bushings 42, 43, and may be preloaded with a predetermined load.
- Figs. 7a-e show a device 1 of the invention, with the commutation unit 4 engaged in a typical work cycle.
- Fig. 7a shows the commutation unit 4 in the first position A, which may correspond to a particular operating condition of the switch 3, e.g. the open circuit condition.
- Fig. 7b shows the same commutation unit 4 in an intermediate unstable position, following a first pull exerted on the actuator by the rope F, and then switches to the second stable position B, as shown in Fig. 7c , which will correspond to another operating condition of the switch 3, e.g. the closed circuit condition.
- Fig. 7d also shows the commutation unit 4 in another intermediate unstable position, following a second pull exerted by the rope F to switch the commutation unit 4 back into the first stable position of Fig. 7e .
- the cross sections associated with each of the front sections show the rotation of the individual projections 29 of the slider 19 after each pull exerted on the actuator 5.
- Fig. 8 shows the plan development of the helical guide surfaces 30, 30'; 31, 31'.
- broken lines outline the helical guide path followed by a single projection 29 during a typical work cycle.
- Figs. 7 and 8 show that, as a result of the first pull exerted on the rope F, the slider 19 will axially slide integrally with the rope F and, at the same time, the projection 29, initially housed in the axial groove 33, will slide on a corresponding inclined surface defined by one of the upper helical surfaces 30 until the stop point defined by the upper concavity between the axial section 36 and the upper guide surface 30.
- the slider 19 will be forced to rotate by a given angle ⁇ , defined by the rotation of the transverse axes X, Y, as shown by the comparison of the cross sections of Figs. 7a and 7b .
- the slider 19 will slide in the opposite direction, due to the elastic return force of the spring 39 thereon, and will cause the projection 29 to slide on one of the lower helical surfaces 31 to the stop point defined by one of the lower abutment surfaces 34, with the slider 19 being further guided in its rotation by an additional angle ⁇ - ⁇ , as shown in the cross section of Fig. 7c .
- the slider 19 will be axially displaced under the action of the spring 39 and its radial projection 29 will slide upon the lower helical guide surface 31', adjacent to the former, and enter another axial groove 33', with the slider 19 being free to slide until the enlarged head 25 of the actuator 5 contacts the upper abutment surface 37 of the head 8.
- the slider 19 will run a total rotation angle ⁇ of 90°, and reach a position that will allow a next cycle to start.
- the cycle may be repeated any time that the electric circuit needs to be closed or opened, such as for turning on or off the emergency lights of a hoistway.
- the device of this invention is susceptible to a number of changes and variants, within the inventive concept disclosed in the appended claims.
Landscapes
- Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
- Ropes Or Cables (AREA)
Claims (9)
- Dispositif de commutation bistable à câbles comprenant :- un corps en forme de boîte (2) conçu pour contenir au moins un interrupteur (3) pouvant être relié à un circuit électrique correspondant,- une unité de commutation bistable (4) associée de façon opérationnelle audit au moins un interrupteur (3) pour permettre la commutation dudit circuit électrique entre une condition fermée et une condition ouverte dudit circuit électrique,
où ladite unité (4) comprend un actionneur (5) pouvant être actionné au moyen d'un câble d'actionnement (F) et moyens de guidage (6) pour guider ledit actionneur (5) entre une première position opérationnelle stable (A) et une deuxième position opérationnelle stable (B) correspondant respectivement à ladite condition ouverte et à ladite condition fermée dudit au moins un interrupteur (3), respectivement ;
où ladite unité (4) est reliée de façon amovible audit corps en forme de boîte (2), les moyens de verrouillage (7) étant placés pour maintenir constamment assemblée ladite unité (4) audit actionneur (5) dans ladite première (A) ou ladite deuxième (B) position opérationnelle stable pour permettre le démontage intégral de ce dernier dudit corps en forme de boîte (2) ;
caractérisé en ce que lesdits moyens de guidage (6) comprennent un coulisseau (19) monté de façon rotative sur ledit actionneur (5) et coulissant axialement dans ladite cavité (17), ledit coulisseau (19) étant équipé sur sa surface latérale externe (28) d'au moins une saillie radiale (29), lesdits moyens de guidage (6) comprenant également au moins une paire de surfaces de guidage hélicoïdales (30, 31) placées de façon axiale mutuellement décalées pour définir une trajectoire de guidage hélicoïdale pour ladite au moins une saillie radiale (29). - Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens de blocage (7) comprennent une tête cylindrique creuse (8) contenant ladite unité de commutation (4) et ayant une portion (9) pour ancrer cette dernière de façon amovible audit corps en forme de boîte (2).
- Dispositif selon la revendication 2, caractérisé en ce que ladite tête (8) présente une cavité essentiellement cylindrique (17) avec une surface latérale interne (18) définissant un axe longitudinal (L) et façonnée pour contenir et maintenir de façon radiale ladite unité de commutation (4).
- Dispositif selon la revendication 2 ou 3, caractérisé en ce que lesdits moyens de guidage (6) sont essentiellement axiaux et qu'ils sont façonnés pour guider ladite unité de commutation (4) de ladite première position (A) à ladite deuxième position (B) et vice versa en réponse à la translation axial monodirectionnelle dudit actionneur (5).
- Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moyens de verrouillage (7) comprennent au moins une surface de butée inférieure essentiellement transversale (34) unie à la surface hélicoïdale inférieure (30) de ladite au moins une paire pour arrêter le coulissement axial vers le bas dudit coulisseau (19).
- Dispositif selon la revendication 5, caractérisé en ce que lesdits moyens de guidage (6) présentent une pluralité de dites paires de surfaces hélicoïdales (31, 31 ; 30', 31') qui sont mutuellement espacées de façon angulaire, lesdits moyens de verrouillage (7) présentant une pluralité de dites surfaces de butée inférieures (34) unies aux surfaces de guidage hélicoïdales inférieures correspondantes (31).
- Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit actionneur (5) est essentiellement cylindrique et présente une portion inférieure (22) conçue pour interagir avec ledit au moins un interrupteur (3) et une portion supérieure (23) qu'on peut ancrer audit câble (F).
- Dispositif selon la revendication 7, caractérisé en ce que ladite cavité tubulaire (17) présente une surface de butée supérieure essentiellement transversale (37) conçue pour interagir avec ladite portion supérieure (23) dudit actionneur (5) pour limiter sa translation axiale vers le bas.
- Dispositif selon la revendication 8, caractérisé en ce qu'il comprend un élément élastique de rappel (39) ayant une première extrémité (40) agissant contre ladite surface de butée supérieure (37) et une deuxième extrémité (41) agissant contre ledit coulisseau (19) pour forcer ladite au moins une saillie radiale (29) pour actionner à partir d'une desdites surfaces hélicoïdales supérieures (30, 30') vers la surface hélicoïdale inférieure correspondante (31, 31') en réponse à la traction dudit actionneur (5) exercée par ledit câble (F).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITVI2008A000307A IT1392603B1 (it) | 2008-12-23 | 2008-12-23 | Dispositivo di commutazione bistabile a fune |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2202770A1 EP2202770A1 (fr) | 2010-06-30 |
EP2202770B1 true EP2202770B1 (fr) | 2013-12-25 |
Family
ID=40810418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20090007766 Active EP2202770B1 (fr) | 2008-12-23 | 2009-06-12 | Dispositif de commutation bistable de câble |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2202770B1 (fr) |
IT (1) | IT1392603B1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102709091A (zh) * | 2012-05-28 | 2012-10-03 | 杭州辰德科技有限公司 | 双稳态拉绳开关 |
ITVI20130291A1 (it) * | 2013-12-06 | 2015-06-07 | Pizzato Elettrica Srl | Interruttore di sicurezza temporizzato ad azionamento manuale |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB876969A (en) * | 1958-11-26 | 1961-09-06 | Hans Wernhard Schneider | Improvements in cord or chain operated electric pull switches |
GB8404028D0 (en) * | 1984-02-16 | 1984-03-21 | Gibbon J | Ancillary switch |
GB2176940B (en) | 1985-05-07 | 1989-06-28 | Contactum Ltd | Improvements in and relating to electrical pull switches |
FR2714999B1 (fr) * | 1994-01-13 | 1996-03-29 | Legrand Sa | Interrupteur électrique à tirage. |
GB2300757B (en) * | 1995-05-09 | 1998-12-23 | Bun Wong | Rotary stepping switch |
GB2330195B (en) | 1997-10-10 | 2001-08-08 | Bonus Electrical Ltd | A wall mounted light fitting |
-
2008
- 2008-12-23 IT ITVI2008A000307A patent/IT1392603B1/it active
-
2009
- 2009-06-12 EP EP20090007766 patent/EP2202770B1/fr active Active
Also Published As
Publication number | Publication date |
---|---|
EP2202770A1 (fr) | 2010-06-30 |
IT1392603B1 (it) | 2012-03-09 |
ITVI20080307A1 (it) | 2010-06-24 |
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