SI24728A - A protective switch with a toggle actuation mechanism - Google Patents

A protective switch with a toggle actuation mechanism Download PDF

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Publication number
SI24728A
SI24728A SI201400194A SI201400194A SI24728A SI 24728 A SI24728 A SI 24728A SI 201400194 A SI201400194 A SI 201400194A SI 201400194 A SI201400194 A SI 201400194A SI 24728 A SI24728 A SI 24728A
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SI
Slovenia
Prior art keywords
lever
force
spring
housing
bridge
Prior art date
Application number
SI201400194A
Other languages
Slovenian (sl)
Inventor
Marko Rode
Original Assignee
Nela, Razvojni Center Za Elektroindustrijo In Elektroniko, D.O.O.
Priority date (The priority date 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 date listed.)
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Application filed by Nela, Razvojni Center Za Elektroindustrijo In Elektroniko, D.O.O. filed Critical Nela, Razvojni Center Za Elektroindustrijo In Elektroniko, D.O.O.
Priority to SI201400194A priority Critical patent/SI24728A/en
Priority to EP14001876.3A priority patent/EP2947672A1/en
Publication of SI24728A publication Critical patent/SI24728A/en

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Classifications

    • 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
    • H01H73/38—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 lever
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Mechanisms For Operating Contacts (AREA)

Abstract

Zaščitno stikalo s klecnim mehanizmom proženja po izumu je zasnovano tako, da klecni mehanizem z malo sestavnimi deli zagotavlja zanesljivo izklapljanje električnega tokokroga pri pojavu napake v le tem in je manj občutljiv na vplive okolja, kot so vibracije. Mehanizem s postavitvijo med izklopljeno (OFF) in vklopljeno (ON) pozicijo vzvoda (1) signalizira izklop zaradi napake v električnem tokokrogu. Zanesljivo izklapljanje je doseženo s klecnim in ne razčlenitvenim mehanizmom, kot je to običajno pri stikalnih napravah, ki varujejo električne tokokroge pri pojavu napake. Klecni mehanizem po izumu vključuje vzvod (1), ki je vrtljivo vpet v ohišju mehanizma in ima valjast nastavek na katerega je vpeta natezna vzmet (15), s spodnjim koncem je vzmet (1) povezana z ročico (19), ki je povezana z ročico (6) in (5), pri čemer je ročica (5) preko ročice (3) povezana z ročico (2) in polovni mostiček (9), ki je vrtljivo vpet v ohišju mehanizma in služi kot nosilec kontaktov.The safety switch with the trigger trigger mechanism according to the invention is designed so that the slip mechanism with few components ensures reliable switching off of the electrical circuit when the error occurs in the dark and is less sensitive to environmental influences such as vibrations. The mechanism by switching between the OFF (OFF) and the ON (ON) position of the lever (1) signals the disconnection due to a fault in the electrical circuit. Reliable switch-off is achieved by a clamp and non-breakdown mechanism, as is usually the case with switchgear devices that protect electrical circuits when an error occurs. The crimping mechanism according to the invention includes a lever (1) which is rotatably clamped in the housing of the mechanism and has a cylindrical nozzle on which the tensile spring (15) is attached, with the lower end of the spring (1) being connected to a lever (19) connected to the handle (6) and (5), whereby the lever (5) is connected to the lever (2) via the lever (3) and a pole (9) which is rotatably clamped in the housing of the mechanism and serves as a contact carrier.

Description

ZAŠČITNO STIKALO S KLECNIM MEHANZMOM PROŽENJASWITCH SWITCH WITH KEY TRIGGER MECHANISM

Predmet izuma je zaščitno stikalo s klecnim mehanizmom proženja, pri katerem mehanizem in izvedba kontaktov omogočata delovanje osnovne funkcije, to je vklapljanje in izklapljanje kontaktov s pomočjo ročno gnanega vzvoda in izklop pri pojavu motnje v električnem tokokrogu, npr. diferenčni tok med faznim in nevtralnim vodnikom. Predloženi izum sodi v razred H01H71/10, H01H71/52 mednarodne patentne klasifikacije.The subject of the invention is a safety switch with a knob actuation mechanism, in which the mechanism and the implementation of the contacts enable the basic function, that is, switching the contacts on and off by means of a manually operated lever and switching off in the event of a disturbance in the electrical circuit, e.g. differential current between phase and neutral conductors. The present invention falls within the class H01H71 / 10, H01H71 / 52 of the international patent classification.

Tehnični problem, ki ga zadovoljivo rešuje predložena izvedba mehanizma, je takšna konstrukcija, ki omogoča ponavljajočo in od zunanjih vplivov manj odvisno izklapljanje pri pojavu motnje v električnem tokokrogu. Pri tem pa mehanizem omogoča ročno vklapljanje in izklapljanje električnega tokokroga.A technical problem that is satisfactorily solved by the proposed embodiment of the mechanism is a construction that allows a repetitive and less dependent external shutdown in the event of a disturbance in the electrical circuit. In doing so, the mechanism allows manual switching on and off of the electrical circuit.

Znane rešitve se poslužujejo različnih izpeljank mehanizmov, ki proženje zagotavljajo z razpetjem dveh ročic. Mehanizem stikala po patentu US4679018 is uporablja za prekinitev tokokroga, to je razklenitev kontaktov, razpetje dveh ročic z dodanim blažilnim mehanizmom, ki zmanjšuje občutljivost mehanizma na proženje zardi vibracij.Known solutions use various derivatives of the mechanisms that provide the actuation by stretching the two arms. The switch mechanism according to patent US4679018 is used to break the circuit, that is, to open the contacts, to stretch the two arms with the added damping mechanism, which reduces the sensitivity of the mechanism to the initiation of vibration.

Mehanizem po izumu rešuje zahteve po hitrem in zanesljivem izklopu električnega 20 tokokroga ob pojavu nepravilnosti v tem istem električnem tokokrogu ob zagotavljanju takojšnega izklopa v primeru prisotnosti toka napake že med vklopom (prosta sprožitev).The mechanism according to the invention solves the requirements for fast and reliable disconnection of the electrical circuit 20 in the event of an irregularity in that same electrical circuit, ensuring an immediate shutdown in the presence of a fault current during startup (free actuation).

Izum bomo opisali na osnovi izvedbenega primera in slik, ki prikazujejo:The invention will be described on the basis of an embodiment and figures showing:

slika 1 mehanizem v vklopljenem stanju po izumu v aksonometrični projekciji;Fig. 1 is an axonometric projection mechanism in the on-state state of the invention;

slika 2 slika 3 slika 4 slika 5 slika 6 slika 7 mehanizem v vklopljenem stanju po izumu v aksonometrični projekciji iz druge smeri;Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 mechanism in the on state according to the invention in axonometric projection from the other direction;

mehanizem v poziciji po izklopu s tokom napake;the mechanism in the position after switching off with the fault current;

mehanizem tik pred izklopom s strani;the mechanism just before turning it off;

mehanizem v izklopljenem stanju s strani;mechanism in the off state from the side;

mehanizem v poziciji po izklopu s tokom napake;the mechanism in the position after switching off with the fault current;

mehanizem v izklopljenem stanju ;mechanism in the off state;

io Mehanizem po izumu tvori vzvod 1, ki je vrtljivo vpet v ohišju mehanizma in ima valjast nastavek na katerega je vpeta natezna vzmet 15, na drugem valjastem nastavku pa je vpeto ležajno kolo 18. Vzmet 15 služi kot hranilnik energije in se razteguje od začetka vklopa pa do trenutka pobega vzvoda 1. Energija shranjena v vzmeti 15 sklene kontakt 10 s kontaktom 13 in stisne kontaktno vzmet 11.io The mechanism according to the invention is formed by a lever 1, which is pivotally mounted in the housing of the mechanism and has a cylindrical attachment to which a tensile spring 15 is mounted, and a second wheel 18 is mounted on the second cylindrical extension. The spring 15 serves as an energy storage and extends from the start of activation. until the lever escapes 1. The energy stored in the spring 15 closes contact 10 with contact 13 and compresses the contact spring 11.

is Polovni mostiček 9 je vrtljivo vpet v ohišju mehanizma in služi kot nosilec kontaktov 10, ki jih je lahko poljubno število največkrat dva ali štiri. Kontakt 10 je premično vpet v polovni mostiček 9 in podprt z vzmetjo 11, ki je delno stisnjena in s silo12 tišči kontakt 10 ob polovni mostiček 9. Vzmet 11 služi kot blažilec ob trku kontaktov in s silo12 zagotavlja stik kontakta 10 in 13, ko se skleneta.is The used jumper 9 is pivotally mounted in the housing of the mechanism and serves as a carrier for contacts 10, which can be any number of times two or four. The contact 10 is movably clamped in the half bridge 9 and supported by a spring 11 which is partially compressed and forces the contact 10 against the full bridge 9 by force 12. The spring 11 serves as a shock absorber for contact collision, and by force 12 ensures contact contacts 10 and 13 when contracted.

V vključenem stanju je napeta vzmet 15 na zgornjem koncu vpeta v vzvod 1 na spodnjem koncu pa na os 25, ki prebada ročico 19. Ročica 19 je na sredini vrtljivo vpeta v ohišje in tako jo na enem koncu, to je na mestu pritrditve na os 25, sila 14 napete vzmeti 15 vleče navzgor, na drugem koncu, to je na vpetju na ročico 6, pa se sila 14 prenaša na vrtljivo vpeto ročico 6. Ročica 6 je vrtljivo spojena z ročico 5 in s siloIn the engaged state, the tension spring 15 at the upper end is clamped to the lever 1 at the lower end and to the axis 25, which pierces the lever 19. The lever 19 is pivotally pivoted into the housing in the middle and thus at one end, that is, at the point of attachment to the axis. 25, the force 14 of the tensioning spring 15 pulls upwards, at the other end, that is, on the clamp on the lever 6, the force 14 is transmitted to the rotatably clamped lever 6. The lever 6 is pivotally coupled to the lever 5 and force

7 deluje na razdalji b pod prijemališčem polovnega mostička 9 in ročice 5. Razdalja b je razdalja med vektorjem sile 7 in vpetjem polovnega mostička 9 in ročice 5. Na ta način drži sila 7 polovni mostiček 9 v vklopljenjem stanju, ta pa stiska kontaktno vzmet7 operates at a distance b below the grip of the used bridge 9 and the lever 5. The distance b is the distance between the force vector 7 and the mounting of the used lever 9 and the lever 5. In this way, the force 7 holds the used jumper 9 in the on state, which compresses the contact spring

11. Zaradi razdalje b deluje sila 7 na ročico 3, ki je vrtljivo vpeta v ročico 5 in ročico 2, kar povzroča zaporno silo 4, ki deluje na razdalji a nad vrtljivim vpetjem ročice 2.11. Due to the distance b, a force 7 is applied to the lever 3, which is rotatably clamped into the lever 5 and the lever 2, which causes a locking force 4, which acts at a distance a above the rotary mounting of the lever 2.

Zaporna sila 4 prične delovati takoj, ko se skleneta kontakta 10 in 13 in potiska ročicoThe locking force 4 becomes operative as soon as contacts 10 and 13 close and pushes the lever

2 proti naslonu 21, ki je del ohišja mehanizma. Na ta način je onemogočen zasuk ročice 2 in s tem je dosežen pogoj podpore ročice 5 in mehanizem ostane vklopljen. Takšno stanje se vzpostavi tudi, ko pride do motnje iz okolice, kot so vibracije. Manjši impulzi sile, ki bi se pri klasičnem zaklepu mehanizma seštevali in vodili do lezenja zaskoka in posledično do neželenega proženja, se v mehanizmu po izumu sproti io odpravljajo.2 against the abutment 21, which is part of the housing of the mechanism. In this way, the rotation of the lever 2 is prevented and thus the condition of the lever support 5 is reached and the mechanism remains switched on. This condition also occurs when environmental disturbances such as vibrations occur. Smaller impulses of force which, in the classical locking mechanism, would be summed up and lead to a snapping of the snap and, consequently, to unwanted actuation, are eliminated in the mechanism according to the invention.

Ob pojavu napake v električnem tokokrogu pride do prožitve releja, ki s silo 20 potisne ročico 16, ta se zavrti okoli vrtljivega vpetja v ohišju in preko vrtilnega momenta prenese silo 27 na ročico 2, ki se zavrti okoli vrtljivega vpetja v ohišju, s tem se premakne delovanje sile 4 pod vpetje ročice 2 v ohišje - razdalja a je razdalja med vektorjem sile 4 in vpetjem ročice 2 in se povečuje, kar povzroči dodatni zasuk ročice 2 proč od naslona 21. Ročica 5 izgubi oporo in se preniha preko vrtišča v polovnem mostičku 9. Vrtilni moment 26, ki ga ustvarjata sila 12, do izklopa kontaktov 10,13 in sila povratne vzmeti 8, zavrti polovni mostiček 9, to pa vodi do popolne razklenitve kontaktov 13 in 10. Ker se polovni mostiček 9 zavrti, oporo izgubi ležajno kolo 18, s tem se sprosti vzvod 1, tega pa zavrti sila 14, ki deluje dokler se vzmet 15 krči. Vzvod 1 se postavi v pozicijo med izklopom in vklopom (TRIP), kar jasno signalizira tok napake.When a fault occurs in the electrical circuit, a relay is actuated which by force 20 pushes the lever 16, which rotates around the rotating clamp in the housing and transmits, through torque, a force 27 to the lever 2, which rotates around the rotating clamp in the housing, thereby moves the force 4 under the arm of the arm 2 into the housing - distance a is the distance between the force vector 4 and the arm of the arm 2 and increases, which causes an additional rotation of the arm 2 away from the abutment 21. The arm 5 loses its support and is transmitted over the pivot in the half bridge. 9. The torque 26 generated by force 12 until the contacts 10,13 is switched off and the return spring force 8 rotates the half-bridge 9, which leads to complete disengagement of contacts 13 and 10. As the half-bridge 9 rotates, the bearing loses its bearing wheel 18, thereby releasing the lever 1, which is rotated by a force 14 that acts as long as the spring 15 shrinks. Lever 1 is placed in the Off and On position (TRIP), which clearly signals the fault current.

Stikalo pripravimo za ponovni vklop tako, da vzvod 1 potisnemo s silo 24 v izklopljeno stanje. Pri tem se os 25 nasloni na vzvod 1, ki jo potisne s silo 23 in zavrti ročico 19, ki s pomočjo sile torzijske vzmeti 22 premakne ročice 6,5,3, ročica 2 sePrepare the switch for reconnection by pushing lever 1 with a force of 24 to the off state. In doing so, the axis 25 rests on the lever 1, which is pushed by a force 23 and rotates the lever 19, which, by the force of the torsion spring 22, moves the levers 6,5,3, the lever 2 se

zavrti in nasloni na naslon 21. S tem se mehanizem postavi v izhodiščno stanje. Vzmet se rahlo napne in drži vzvod 1 v izklopljenem stanju.rotates and rests on rest 21. This puts the mechanism in its original state. The spring is slightly tensioned and holds the lever 1 in the off state.

Claims (5)

1. Zaščitno stikalo s klecnim mehanizmom proženja za vklapljanje in izklapljanje kontaktov s pomočjo ročno gnanega vzvoda in izklop pri pojavu motnje v električnem1. Push-button actuated switch for switching contacts on and off by means of a manually operated lever and switching off in the event of a power failure 5 tokokrogu, označen s tem, da klecni mehanizem tvori:5 is a circuit characterized in that the kneading mechanism forms: - vzvod (1), ki je vrtljivo vpet v ohišju mehanizma in ima valjast nastavek na katerega je vpeta natezna vzmet (15), na drugem valjastem nastavku pa je vpeto ležajno kolo (18);- a lever (1) which is pivotally mounted in the housing of the mechanism and has a cylindrical attachment to which a tensile spring (15) is mounted, and a second wheel (18) is attached to the second cylindrical extension; - vzmet (15), ki je na zgornjem koncu vpeta v vzvod (1), na spodnjem koncu pa na io os (25), ki prebada ročico (19) in je ročica (19) na sredini vrtljivo vpeta v ohišje, na drugem koncu pa na vrtljivo vpeto ročico (6), ki je vrtljivo spojena z ročico (5), ki je vpeta v polovni mostiček (9);- a spring (15) which is engaged at the upper end in a lever (1) and at the lower end by an io axis (25) which pierces the lever (19) and the lever (19) is pivotally pivoted into the housing in the middle, at the other and finally to a pivoting lever (6) which is pivotally coupled to a lever (5) which is engaged in the half-bridge (9); - ročica (3), ki je vrtljivo vpeta v ročico (5) in ročico (2);- a lever (3) which is rotatably engaged in the lever (5) and the lever (2); - ročica (16), kije vrtljivo vpeta v ohišju mehanizma;- a lever (16) which is pivotably engaged in the housing of the mechanism; is - polovni mostiček (9), ki je vrtljivo vpet v ohišju mehanizma in služi kot nosilec kontaktov (10), ki jih je lahko poljubno število največkrat dva ali štiri in je kontakt (10) premično vpet v polovni mostiček (9) in podprt z vzmetjo (11), ki je delno stisnjena in s silo (12) tišči kontakt (10) ob polovni mostiček (9).is a half-bridge (9) pivotally mounted in the housing of the mechanism and serving as a carrier of contacts (10), which can be any number of times two or four and the contact (10) is movably clamped in the second bridge (9) and supported with spring (11) partially compressed and force (12) to tighten the contact (10) to the full jumper (9). 2. Mehanizem po zahtevku 1, označen s tem, da vzmet (11) služi kot blažilec ob trkuA mechanism according to claim 1, characterized in that the spring (11) serves as a shock absorber 2o kontaktov (10, 13) in s silo (12) zagotavlja stik kontakta (10) in (13), ko se skleneta.The 2o contacts (10, 13) and the force (12) provide the contact contact (10) and (13) when contracted. 3. Mehanizem po zahtevku 1, označen s tem, da pri vklopu sila (14) napete vzmeti (15) vleče ročico (19) navzgor, na drugem koncu, to je na vpetju na ročico (6), pa se sila (14) prenaša na vrtljivo vpeto ročico (6), ki je vrtljivo spojena z ročico (5) in s silo (7) deluje na razdalji (b) pod prijemališčem polovnega mostička (9) in ročice (5) in držiA mechanism according to claim 1, characterized in that when the force (14) is engaged, the tension spring (15) pulls the lever (19) upwards, and at the other end, i.e. on the lever (6), the force (14) transmits to the rotatable clamping lever (6), which is pivotally coupled to the lever (5) and acts by force (7) at a distance (b) below the grip of the used bridge (9) and the lever (5) and holds 25 polovni mostiček (9) v vklopljenjem stanju, ta pa stiska kontaktno vzmet (11), pri čemer deluje sila (7) na ročico (3), ki je vrtljivo vpeta v ročico (5) in ročico (2) na razdalji (a) nad vrtljivim vpetjem ročice (2), kar povzroča zaporno silo (4), ki potiska ročico (2) proti naslonu (21), ki je del ohišja in s tem preko ročice (3) podpira ročico (5).25 used jumper (9) when switched on, which compresses the contact spring (11), applying a force (7) to the lever (3) rotatably engaged in the lever (5) and the lever (2) at a distance (a ) above the rotary arm of the lever (2), which causes a locking force (4) that pushes the lever (2) against the abutment (21) that is part of the housing, thereby supporting the lever (5) via the lever (3). 4. Mehanizem po zahtevku 1, označen s tem, da prožitev releja s silo (20) potisne 5 ročico (16), ki preko vrtilnega momenta prenese silo (27) na ročico (2), ki se zavrti kar privede do spremembe vrtilnega momenta, ki ga povzroča sila (4); ročica (5) izgubi oporo in se preniha v polovnem mostičku (9); vrtilni moment (26), ki ga ustvarjata sila (12) do izklopa kontaktov (10,13) in sila povratne vzmeti (8), zavrti polovni mostiček (9), to vodi do popolne razklenitve kontaktov (13) in (10) in io postavitve vzvoda (1) v lego med vklopom (ON) in izklopom (OFF) in s tem signalizira izklop zaradi motnje v električnem tokokrogu (TRIP).Mechanism according to claim 1, characterized in that the actuation of the relay by a force (20) pushes a 5 lever (16) which, through torque, transfers the force (27) to the lever (2), which rotates, resulting in a change in the torque caused by force (4); the lever (5) loses its support and falls into the half bridge (9); the torque (26) generated by the force (12) until the contacts are switched off (10,13) and the return spring force (8) rotates the half-bridge (9), which leads to the complete disengagement of contacts (13) and (10), and io the positioning of the lever (1) in the position between on (ON) and off (OFF), thereby signaling the tripping due to a fault in the electrical circuit (TRIP). 5. Mehanizem po zahtevku 1, označen s tem, da se s potiskom vzvoda (1) s silo (24) v izklopljeno stanje (OFF) os (25) nasloni na vzvod (1), ki jo potisne s silo (23) in zavrti ročico (19), ki s pomočjo sile torzijske vzmeti (22) premakne ročice (3, 5, 6),Mechanism according to claim 1, characterized in that by pushing the lever (1) with the force (24) to the off state (OFF), the axis (25) rests on the lever (1), which it pushes with force (23), and rotate the lever (19) which moves the levers (3, 5, 6) by the force of the torsion spring (22), 15 ročica (2) se zavrti in nasloni na naslon (21).15 The lever (2) swivels and rests on the support (21).
SI201400194A 2014-05-23 2014-05-23 A protective switch with a toggle actuation mechanism SI24728A (en)

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Application Number Priority Date Filing Date Title
SI201400194A SI24728A (en) 2014-05-23 2014-05-23 A protective switch with a toggle actuation mechanism
EP14001876.3A EP2947672A1 (en) 2014-05-23 2014-05-29 Protective circuit breaker with toggle trip mechanism

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SI201400194A SI24728A (en) 2014-05-23 2014-05-23 A protective switch with a toggle actuation mechanism

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SI24728A true SI24728A (en) 2015-11-30

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113963966B (en) * 2020-07-20 2022-09-06 上海良信电器股份有限公司 Separating brake switch and remote circuit breaker

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3242286A (en) * 1962-12-24 1966-03-22 Heinemann Electric Co Circuit breaker linkage having a toggle link of variable length
US4679018A (en) 1986-01-15 1987-07-07 Westinghouse Electric Corp. Circuit breaker with shock resistant latch trip mechanism

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