CN1242437C - Safety switch trip linking structure - Google Patents

Abstract

The present invention relates to a safety switch trip linkage structure which links a locating rod to act synchronously by pushing a key, so that a cyclic locating relationship is formed by the mutual linkage among the locating rod, an annular stairway and a locating linkage piece, and a contact piece is directly pushed and pulled by the locating linkage piece to form the ON or the OFF of a switch. When current is overloaded in an ON state, the contact piece of a connected circuit is reversely bent to bounce due to temperature distortion to switch off a circuit. The present invention solves the defects of heavy and complicated assembly, high production cost, indirect linkage relationship, slow linkage stroke reaction and lots of failures on the operation of the switch in the existing switch linkage structure, and the present invention particularly solves the problem of electricity utilization danger caused by that a contact overheats to generate sparks.

Description

Trip linkage structure of safety switch

Technical Field

The invention relates to a trip linkage structure of a safety switch, which is characterized in that a key is pressed to link a positioning rod to synchronously act, so that the positioning rod is linked with an annular ladder way and a positioning linkage sheet to form a circulating positioning relation, and then the positioning linkage sheet directly drives a contact sheet to jump to form ON or OFF of the switch; the positioning linkage plate is provided with a plurality of grooves which are communicated with each other in the center and are almost in a fork shape in the groove, and the positioning rod slides in the plurality of grooves of the groove, so that the positioning rod is linked with the positioning linkage plate to directly push and pull the contact plate to form ON-OFF or OFF-OFF of a switch; especially, when the connection current of the circuit loop is in an overload state, and the action process from power-OFF OFF to power-ON ON, the contact sheet can be quickly heated, deformed and reversely bent and directly pushes the positioning linkage sheet, at the moment, the second groove provides a path for the positioning linkage sheet to freely rotate, the positioning rod is relatively displaced in the second groove, the second groove is not blocked by the positioning rod, the contact sheet is smoothly reversely bent and quickly jumps OFF, and the power-OFF OFF state of the circuit loop is formed.

Background

In general, the operation of a power switch mainly includes two operation strokes, i.e., power-on and power-off, and in order to effectively perform the interlocking operation of the internal components of the switch and simplify the switch components to reduce the manufacturing cost, continuous research and improvement of the switch structure are important issues for manufacturers.

Patents for switch configurations such as U.S. patents 4,167,720,4,937,548, 5,223,813, 5,451,729, 5,558,211, etc., are not exhaustive, but all share common disadvantages:

(1) the linkage components are various, the linkage stroke is complex, the non-real-time action relationship between the key and the terminal component is generated, and the manufacturing cost is also increased.

(2) The action relationship is not exact, the failure chance is increased, and the use safety of consumers is not facilitated.

(3) The button directly or indirectly presses the contact piece to form power-on or power-off, which is easy to cause poor contact or fracture and damage, reduces power-on quality and shortens service life.

As shown in fig. 1, 2 and 3, in the structure disclosed in U.S. patent 5,223,813, after the button is pressed, the button is linked with the link rod below the button, and then the up-and-down swinging component connected with the link rod presses or releases the contact piece below the button to make the upper contact point contact or jump off the lower contact point to turn on or off the circuit; however, the components thereof have the obvious disadvantages of higher manufacturing cost, increased operation failure, slow response of linkage stroke, and potential breakage or elastic fatigue of the contact sheet, and in the process from power OFF to power ON, if the connection current in the circuit loop is overloaded, the contact points can be overheated and generate sparks, which causes electricity utilization danger, etc., which become common problems for manufacturing and users, so further improvement is needed.

Disclosure of Invention

The invention aims to solve the defects of complex components, high manufacturing cost, indirect linkage relation, slow linkage stroke response and more faults of the switch in operation of the known switch linkage structure, and particularly solves the problem that the known switch linkage structure cannot avoid the power utilization danger caused by overheating and sparks of a contact due to the overload state of a linkage current existing in a circuit loop in the action process from power-OFF OFF to power-ON.

The invention relates to a trip linkage structure of a safety switch, which mainly comprises a key, a switch body, a positioning linkage sheet and a contact sheet; the key is movably connected above the switch body, a positioning rod is assembled between the key and the switch body, one end of the positioning rod is a convex rod, an annular ladder way is concavely arranged on the side surface between the key and the switch body, an inclined lug is convexly arranged in the annular ladder way, a notch is formed in the positioning linkage plate, the positioning linkage plate is assembled beside the opening of the annular ladder way and can swing left and right relative to the opening of the annular ladder way, a hook part is arranged on the positioning linkage plate in an extending manner, the hook part is movably connected with the movable end of the contact plate, and the end of the convex rod of the positioning rod penetrates through the notch of the positioning linkage plate and extends into the annular ladder way.

When the device is implemented, the push button is linked with the positioning rod to synchronously act, the positioning rod is linked with the annular ladder way and the positioning linked sheet to form a circulating positioning relation, and then the positioning linked sheet directly pushes and pulls the contact sheet to form ON-OFF or OFF-OFF of the switch; when the current is overloaded under the ON state, the contact piece of the connecting circuit is heated to deform and reversely bend and bounce, so that the circuit loop is powered OFF, and the positioning linkage piece is driven to rotate, so that the key is bounced upwards to form a reuse state.

The invention is characterized in that: the positioning linkage sheet is provided with a plurality of grooves which are communicated in a fork shape in the groove, the positioning rod slides in the grooves of the groove to directly link the positioning linkage sheet and the contact sheet to form ON or OFF of the switch; wherein, the first and the third grooved slots are respectively a positioning slot for positioning the rod when the circuit is powered OFF and powered ON; in a normal state, in the action from power-OFF OFF to power-ON, the second groove is a path through which the positioning rod passes when the positioning rod acts; when the connection use current of the circuit loop is in an overload state, the contact sheet can be rapidly heated, deformed and reversely bent and directly pushes the positioning linkage sheet in the action from power-OFF OFF to power-ON ON, at the moment, the second groove provides a path positioning rod for the free rotation of the positioning linkage sheet to relatively displace in the second groove, the second groove is not blocked by the positioning rod, the contact sheet is smoothly reversely bent and rapidly tripped to form power-OFF OFF of the circuit loop, so that the switch can sense the overload current at the first time of pressing the power-ON to form power-OFF OFF of the trip, and the safety of the power utilization of the switch is enhanced; meanwhile, the movable end of the contact piece drives the positioning linkage piece to rotate, so that an opening is formed between the opening end of the third groove and the upper end part of the inclined convex piece of the annular ladder way, the positioning rod is not blocked by the inner edge of the third groove, and the key is bounced upwards and directly returns to the original power-OFF OFF state.

The invention is composed of a positioning rod, a ring ladder way, a positioning linkage sheet and a contact sheet to form a simple direct linkage structure, the main purpose is that the positioning rod slides in the plurality of grooved grooves by the plurality of grooved communication grooves of the positioning linkage sheet, the positioning rod directly links the positioning linkage sheet and directly pushes and pulls the contact sheet to form a switch ON or OFF, when the connection using current in the circuit loop is in an overload state, the contact sheet is quickly heated, deformed and reversely bent and directly pushes the positioning linkage sheet, the second groove can provide a path for the free rotation of the positioning linkage sheet, and is not obstructed by the positioning rod, so that the contact sheet is smoothly and quickly bent and jumped OFF, the positioning rod does not need to enter the circuit ON position of the third groove, and is jumped OFF to the first groove directly and returns to the original OFF position, the power-OFF OFF of the circuit loop is formed, and the safety of power utilization is ensured.

Another object of the present invention is to provide a switch that can sense an overcurrent at the first time of pressing power on to form a trip circuit when the circuit loop is in a state of current overload, so that the action stroke of the switch is more sensitive and faster, thereby avoiding local overheating of the contact and spark generation, and enhancing the safety of power utilization.

Another object of the present invention is to provide a switch structure that has a small number of components and is easy to assemble, and that can effectively reduce the manufacturing cost, prolong the service life of the switch structure, and reduce the cost of consumers.

Drawings

FIG. 1 is an exploded perspective view of a prior art;

FIG. 2 is a cross-sectional view of the prior art showing a power OFF condition;

FIG. 3 is a cross-sectional view of the prior art showing the power ON condition;

FIG. 4 is an exploded perspective view of an embodiment of the present invention;

fig. 5 is a perspective view of the switch body and the positioning linkage plate according to the embodiment of the invention;

FIG. 6 is a combined cross-sectional view of an embodiment of the present invention, showing a power OFF condition;

FIG. 7 is a combined cross-sectional view of the embodiment of the present invention showing the interlocking state pressed by the power-OFF OFF state;

FIG. 8 is a combined cross-sectional view of an embodiment of the present invention showing the power ON condition;

fig. 9 is a combined cross-sectional view of the embodiment of the present invention, which shows that when the key is pressed to the bottom by the power-ON condition, the end of the protruding rod of the positioning rod is separated from the limitation of the positioning linking sheet, and is in a state of being able to jump upwards;

fig. 10 is a combined cross-sectional view of an embodiment of the invention, which shows that when the current is overloaded under the condition of power-ON, the contact piece is bent and tripped reversely, and the positioning linkage piece is driven to rotate and displace, so that the end of the protruding rod of the positioning rod is disengaged from the limit, and is in a state of being capable of tripping upwards.

Fig. 11 is a sectional view of the assembly of the embodiment of the present invention, which shows that when the circuit is overloaded, the contact piece is bent and tripped in the opposite direction to form the power-OFF state rapidly in the action of pressing from the power-OFF state to the power-ON state, the contact piece drives the positioning linkage piece to rotate, so that the positioning rod is displaced leftwards relative to the second groove, and the lug end of the positioning rod is disengaged from the limit of the third groove, and is in the state of being able to jump upwards.

In the drawings

1 push-button

10 cover body

11 clasp

12 elastic member (compression spring)

13 binding column

14 locating rod

141 perforation

142 protruding rod

15 elastic member (compression spring)

2 switch body

20 catching groove

21 Cross bar

22 annular ladder way

23 angular lugs

24 combined hole

25 first contact terminal

251 convex column

26 second contact terminal

261 contact hole

262 second contact

27 groove

3 positioning linkage sheet

30 bolt

31 open slot

32 combination hole

33 hook part

332 clamp groove

A first trench

B second trench

C third groove

4 contact sheet

41 support leg

410 perforation

42 spring plate

421 contact hole

422 first contact

Detailed Description

For a detailed description of the objects, features and effects of the present invention, the present invention will be described in detail by the following preferred embodiments, in conjunction with the accompanying drawings:

fig. 4 to 6 show an exploded perspective view, a switch body perspective view, and a combined sectional view of the embodiment of the present invention; the invention relates to a trip linkage structure of a safety switch, which mainly comprises a key 1, a switch body 2, a positioning linkage sheet 3 and a contact sheet 4; wherein,

a cover 10 is assembled above the key 1, at least one hook 11 is convexly arranged on the side surface of the key 1, the key 1 is movably embedded in the upper opening of the switch body 2, and at least one elastic element 12, in this embodiment, a compression spring, is assembled between the key 1 and the switch body 2, so that the key 1 has outward and upward elastic force; a combination column 13 is arranged on the side surface of the key 1, the combination column 13 is combined with a positioning rod 14, the upper end of the positioning rod 14 is a through hole 141, one end of the lower part of the positioning rod 14 is provided with a convex rod 142, the end of the convex rod 142 bends to point to the annular ladder way 22 in the switch body 2, the through hole 141 of the positioning rod 14 and an elastic piece 15 are sleeved in the combination column 13, the periphery of the through hole 141 of the positioning rod 14 is pushed by the elastic force of the elastic piece 15, so that the positioning rod 14 is combined with the combination column 13 of the key 1, the positioning rod 14 can swing relative to the key 1 by taking the through hole 141 as the axis, and the elastic piece 15 applies the elastic force of the positioning rod 14 to point to the; in the present embodiment, the elastic member 15 is a compression spring.

The switch body 2 is provided with at least one groove 27 for accommodating the elastic element 12 between the key 1 and the switch body 2, the inner side wall surface of the switch body is concavely provided with at least one buckle groove 20 and a cross rod 21, the buckle groove 20 and the cross rod 21 correspond to at least one buckle 11 protruding from two opposite side surfaces of the key 1, the inner side surface of the switch body 2 is concavely provided with a polygonal annular ladder way 22, an inclined lug 23 is convexly arranged in the annular ladder way 22, and the lower side of the annular ladder way 22 is provided with a combination hole 24; at least two contact terminals, in this embodiment, two contact terminals, namely, a first contact terminal 25 and a second contact terminal 26, are disposed on the bottom surface of the switch body 2, two protruding columns 251 are disposed on the upper bending portion of the first contact terminal 25, and a contact hole 261 is disposed on the upper portion of the second contact terminal 26 and is combined with a second contact 262.

The positioning linkage plate 3 is integrally formed, and is a plate body in general, wherein a slot 31 is provided therein, and a plurality of forked connected grooves are provided in the slot 31, in the embodiment, the number of the grooves provided in the slot 31 is three, and the centers of the three grooves are connected to form a forked shape in general; the upper end of the open slot 31 is a first slot A, the left lower end is a second slot B, the right lower end is a third slot C, the lower side of the open slot 31 is provided with a combination hole 32, a bolt 30 passes through the combination hole 32 to be combined in a combination hole 24 at the lower side of the annular ladder way 22 of the switch body 2, and the positioning linkage plate 3 can swing left and right relative to the annular ladder way 22 of the switch body 2 by taking the combination hole 32 as an axis; the positioning linkage plate 3 is extended with a hook 33, a clamping groove 332 is formed inside the hook 33, the clamping groove 332 movably clamps the movable end of the contact plate 4, so that the contact plate 4 and the positioning linkage plate 3 generate a direct linkage relationship.

The contact piece 4, roughly a flexible sheet body, there is a contact 422 on it, can jump to the two sides of the sheet body, the deformation takes the form of the reverse bending bounce when heated, the contact piece 4 can also be the compound metal flake, deform and bend to one side when heated; in this embodiment, two sides of the contact sheet 4 form legs 41, the middle is a spring sheet 42, the whole body is slightly E-shaped, the opening ends of the legs 41 are respectively provided with through holes 410, the distance between the two through holes 410 is slightly larger than the distance between the two convex columns 351 of the first contact terminal 25, the two legs 41 are slightly closed, the two through holes 410 are respectively sleeved into the two convex columns 251 above the first contact terminal 25, so that the contact sheet 4 is slightly curved and arched, the free end of the spring sheet 42 at the middle part is opposite to the curved direction of the contact sheet 4, the free end of the spring sheet 42 is provided with a contact point hole 421, and the contact point hole 421 is combined with a first contact point 422 downwards; in the present embodiment, the contact piece 4 is a bimetal piece that bends and deforms to one side when heated.

When the switch is assembled, the end of the protruding rod 142 of the positioning rod 14 passes through the slot 31 of the positioning linkage plate 3 and extends into the annular ladder way 22 of the switch body 2.

The specific implementation is as follows: referring to fig. 6 to 9, when the switch is in the normally OFF state, as shown in fig. 6, the user presses the upper cover 10 of the key 1, the key 1 moves the positioning rod 14 downward, the end of the protruding rod 142 of the positioning rod 14 moves left and downward in the annular ladder way 22 along the upper side of the inclined protrusion 23, and moves to the lower side of the inclined protrusion 23 along the annular ladder way 22 in the counterclockwise direction, the protruding rod 142 of the positioning rod 14 contacts and pushes the slot 31 of the positioning linkage plate 3, and slides from the first slot a to the second slot B, so that the positioning linkage plate 3 rotates left, as shown in fig. 7, the upper side of the third slot C of the slot 31 is slightly horizontal and is connected to and closed with the left and lower sides of the inclined protrusion 23 in the annular ladder way 22, releasing the key 1 makes the protruding rod 142 of the positioning rod 14 slide to the upper side of the opening inner edge of the third slot C of the slot 31 along the left and lower side of the inclined protrusion 23 in the annular ladder way 22, as shown in fig. 8, the positioning rod 14 is positioned downward, and at the same time, the positioning linkage plate 3 is pushed and rotated by the end of the protruding rod 142, the coupling hole 32 rotates counterclockwise to the left as an axis, the hook 33 of the positioning linkage plate 3 rotates upward, the clamping groove 332 clamps the movable end of the contact plate 4 upward, so that the elastic sheet 42 in the contact plate 4 bounces downward reversely, the first contact 422 at the free end of the elastic sheet 42 contacts with the second contact 262 downward, and the ON state of the circuit loop is formed.

When the switch is in the power-ON state, as shown in fig. 8, the user presses the cover 10 of the key 1, the key 1 moves downward to link the positioning rod 14, the end of the protruding rod 142 of the positioning rod 14 moves downward to the left in the annular ladder 22, the protruding rod 142 of the positioning rod 14 pushes the slot 31 of the positioning linkage plate 3 to slide rightward in the third slot C, so that the positioning linkage plate 3 rotates rightward, the third slot C of the slot 31 rotates from the original slightly horizontal shape to an inclined shape which is downward at the right end and upward at the left end, the open end of the third slot C and the upper end of the inclined lug 23 in the annular ladder 22 form an opening, as shown in fig. 9, at this time, the end of the protruding rod 142 of the positioning rod 14 loses the block at the upper side of the third slot C of the slot 31, the elastic member 12 inside the key 1 compresses the spring to stretch elastically, the key 1 and the positioning rod 14 bounce upward, the end of the protruding rod 142 of the positioning rod 14 faces the open end along the third slot C and goes upward along the annular ladder 22, the end of the protruding rod 142 of the positioning rod 14 is moved to the top end of the third groove a of the slot 31 of the positioning linkage sheet 3, and is moved to the upper left side surface of the inclined protruding piece 23 in the annular ladder way 22, so that the positioning rod 14 and the key 1 are positioned upwards, as shown in fig. 6; in the process from fig. 8, 9 to 6, when the positioning rod 14 moves to the lower right, the protruding rod 142 pushes the third groove C of the open slot 31, the positioning linkage plate 3 rotates clockwise and rightward around the coupling hole 32, the hook 33 of the positioning linkage plate 3 is linked downward, the clamping slot 332 of the hook 33 clamps the movable end of the contact plate 4 downward, the elastic piece 42 in the contact plate 4 bounces upward in the opposite direction, and the first contact 422 of the free end of the elastic piece 42 is separated upward from the second contact 262, forming the OFF state of the circuit.

When the circuit loop is powered ON, as shown in fig. 8, and the current is overloaded, the contact 4 is deformed by heat and bends reversely and bends downward, the movable end of the contact 4 bounces downward, so that the elastic sheet 42 in the contact 4 bounces reversely and upward, the first contact 422 at the free end of the elastic sheet 42 is separated upward from the second contact 262, forming the OFF state of the circuit loop, and at the same time, when the movable end of the contact 4 bounces downward, the hook 33 of the positioning linkage sheet 3 is driven downward, so that the positioning linkage sheet 3 rotates clockwise and rightward around the combining hole 32, the upper end of the inclined lug 23 in the annular ladder way 22 and the open end of the third groove C form an open mouth, as shown in fig. 10, at this time, the end of the protruding rod 142 of the positioning rod 14 loses the block of the inner side edge of the third groove C of the open groove 31, the elastic member 12 inside the key 1 compresses the spring to stretch elastically, so as to bounce the key 1 and 14 upward, the end of the protruding rod 142 of the positioning rod 14 moves upward along the third groove C toward the opening end and along the annular ladder way 22 to reach the top end of the first groove a of the slot 31 of the positioning linkage plate 3, and at the same time, the end of the protruding rod 142 of the positioning rod 14 moves to the upper left side of the inclined lug 23 in the annular ladder way 22 to form a state that the positioning rod 14 and the key 1 are positioned upward, as shown in fig. 6, a current overload trip and the key 1 and the positioning rod 14 trip back to a reuse state of general power-OFF are achieved.

Referring to fig. 11, the main features of the present invention are: the slot 31 of the positioning linkage plate 3 forms a plurality of forked grooves with central communication, preferably three grooves A, B, C, and the central communication of the three grooves A, B, C is roughly formed into a forked shape; the positioning rod 14 slides in the three grooves A, B, C of the slot 31, so that the positioning rod 14 is linked with the positioning linkage plate 3 to directly push and pull the contact plate 4 to form ON/OFF of the switch; among the grooves of the slot 31, the first and third grooves A, C are positioning grooves for positioning the lever 14 in the OFF state and ON state of the circuit, respectively, refer to the schematic diagrams of fig. 6 and 8; in a normal state, the second groove B is a path that the positioning rod 14 passes through during the motion, as shown in the continuous motion diagrams of fig. 6, 7 and 8; when the connection use current in the circuit loop is in an overload state, the key 1 is pressed from power-OFF to power-ON, as shown in the action process of fig. 6 to fig. 7, that is, the positioning linkage plate 3 pushes the contact plate 4 to bounce to form circuit power-ON, at the same time, the contact plate 4 is rapidly heated to deform and reversely bend and directly push the positioning linkage plate 3 to rotate, referring to fig. 11, the second groove B provides a path for the positioning linkage plate 3 to freely rotate clockwise rightwards, the positioning linkage plate 3 is not obstructed by the positioning rod 14, so that the contact plate 4 is freely and rapidly bent and reversely to jump OFF, the power-OFF state of the circuit loop is formed, the switch senses the overload current at the first time of pressing to form power-ON to form power-OFF state, and the safety of the power utilization of the switch is enhanced.

Meanwhile, the movable end of the contact piece 4 drives the positioning linkage piece 3 to rotate, so that an opening is formed between the opening end of the third groove C and the upper end of the inclined lug 23 of the annular ladder way 22, the positioning rod 14 is not blocked by the inner edge of the third groove C, the positioning rod 14 does not need to enter the circuit power-ON position of the third groove C, and directly jumps to the first groove A and returns to the original power-OFF OFF position to form the circuit power-OFF OFF, the action process is simplified and rapid, and the safety of power utilization can be ensured.

From the above, the key 1 and the positioning rod 14 act upwards or downwards synchronously, the positioning rod 14 and the annular ladder way 22 of the switch body 2 and the positioning linkage plate 3 are linked with each other to form a circulating positioning relationship, then the hook 33 of the positioning linkage plate 3 pushes and pulls the contact plate 4 to jump to form a switch power-ON or power-OFF OFF, when the current is overloaded after the power-ON, the key 1 has the efficacy of real-time power-OFF OFF tripping, and is in a reuse state of general power-OFF OFF, particularly in the state that the current is overloaded, and in the action process of pressing the key 1 from the power-OFF OFF to the power-ON, the second groove B provides a path for the positioning linkage plate 3 to freely rotate rightwards, so that the key is not blocked by the positioning rod 14, the contact plate 4 can be rapidly deformed by heat and reversely bent to trip to form a circuit power-OFF OFF, and the switch senses the overload current to form the power-OFF OFF, the safety of the power utilization of the switch is enhanced, the component structure and the action relation of the invention have practical efficacy, and the invention is an unseen new design and has efficacy and progress.

The above description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention. All equivalent changes and modifications made according to the scope of the present invention should fall within the protection scope of the present invention.

Claims (12)

1. A trip linkage structure of a safety switch mainly comprises a key, a switch body, a positioning linkage sheet and a contact sheet; wherein,

the key is movably sleeved above the switch body, the key slides up and down relative to the switch body, at least one elastic piece is combined between the key and the switch body to enable the key to have upward elasticity relative to the switch body, a positioning rod is movably combined between the key and the switch body, a convex rod is formed at one end below the positioning rod, and the convex rod bends to point into an annular ladder way;

the switch body is sleeved with the keys, the annular ladder way is arranged between the switch body and the keys, and an inclined lug is convexly arranged in the annular ladder way; the bottom surface of the switch body is combined with at least two contact terminals;

the positioning linkage sheet is integrally formed, is combined beside the opening of the annular ladder way and can swing left and right relative to the opening of the annular ladder way, and the positioning linkage sheet is provided with a hook part which is movably connected with the movable end of the contact sheet;

the contact piece is provided with a contact point which can jump to the two sides of the sheet body of the contact piece and is deformed and bent reversely when being heated;

when the switch is combined, the lug end of the positioning rod passes through the positioning linkage sheet and extends into the annular ladder way, and when the switch is implemented, the key, the positioning rod, the positioning linkage sheet and the contact sheet of the switch are in the actions of general power-ON ON, power-OFF OFF or current overload trip power-OFF OFF to form a switch reuse state, and the actions are in the action relation of direct linkage;

the method is characterized in that: the positioning linkage sheet is provided with a slot, the slot is provided with a plurality of slots with the centers communicated, and a convex rod of the positioning rod slides in the plurality of slots of the slot to ensure that the positioning rod is linked with the positioning linkage sheet to directly push and pull the contact sheet to form ON-OFF or OFF-OFF of the switch; wherein,

the first and the third grooves in the plurality of grooves of the groove are positioning grooves of the positioning rod in the power-OFF OFF and power-ON states of the circuit respectively; in a normal state, the second groove is a path through which the positioning rod passes when the positioning rod acts; when the connection use current in the circuit loop is in an overload state, the key is pressed from power-OFF OFF to power-ON, namely, the positioning linkage plate pushes the contact plate to bounce to form a circuit power-ON ON, the contact plate is rapidly heated, deformed and reversely bent and directly pushes the positioning linkage plate to rotate, the second groove provides a free rotating path for the positioning linkage plate, the second groove is not blocked by the positioning rod, the contact plate can be rapidly reversely bent and bounced OFF, and the power-OFF OFF of the circuit loop is formed.

2. The safety switch trip linkage structure as recited in claim 1, wherein the number of the grooves formed in the slot of the positioning linkage plate is three, and the centers of the three grooves are connected to form a three-fork shape.

3. The trip linking structure of safety switch as claimed in claim 1, wherein the positioning linking plate is a plate.

4. The safety switch trip linkage structure according to claim 1, wherein the slot of the positioning linkage plate is three slots in a shape of a fork, the upper end of the slot is a first slot, the left lower end of the slot is a second slot, the right lower end of the slot is a third slot, and the lower side of the slot is provided with a combination hole, so that the combination hole is correspondingly combined in a combination hole beside the annular ladder way of the switch body.

5. The trip linking structure of a safety switch as claimed in claim 1, wherein a clipping slot is formed inside the hook portion of the positioning linking plate, the clipping slot movably clips the movable end of the contact plate, so that the contact plate and the positioning linking plate are directly linked.

6. The trip linkage structure of a safety switch according to claim 1, wherein at least one of the elastic members combined between the button and the switch body is a compression spring.

7. The trip linking structure of a safety switch as claimed in claim 1, wherein the switch body has at least one recess for receiving the elastic member between the button and the switch body, and at least one slot, a cross bar and at least one hook are correspondingly disposed between the switch body and the button.

8. The trip linking structure of a safety switch as claimed in claim 1, wherein a connecting post is disposed on a side surface of the key, a through hole is disposed at an upper end of the positioning rod, the through hole of the positioning rod and the connecting post of the key are fitted with an elastic member, the elastic member fitted into the key connecting post pushes against a periphery of the through hole of the positioning rod to combine the positioning rod with the connecting post of the key, the positioning rod swings relative to the key with the through hole as an axis, and the elastic member fitted into the key connecting post applies an elastic force to the positioning rod in a direction pointing to the loop ladder way.

9. The trip linking structure of safety switch as claimed in claim 8, wherein the elastic member sleeved on the key combination post is a compression spring.

10. The trip linking structure of a safety switch according to claim 1, wherein a combining hole is formed beside the circular ladder way;

the lower side plate body of the positioning linkage plate is provided with a combination hole;

a bolt passes through the combination hole of the positioning linkage plate and is combined in the combination hole beside the annular ladder way, so that the positioning linkage plate can swing left and right relative to the annular ladder way of the switch body by taking the combination hole as an axis;

the inner sides of a plurality of grooves of the groove of the positioning linkage plate and the inclined convex pieces of the annular ladder way form a closed or an open through the swinging of the positioning linkage plate, so that the end of the convex rod of the positioning rod is circularly positioned below or jumps to the upper end of the annular ladder way from the open.

11. The trip linkage structure of a safety switch according to claim 1, wherein the contact piece is formed into an arc-shaped sheet body by external force, and can jump to two side surfaces of the sheet body and deform to be bent and bounce in a reverse direction when heated.

12. The trip link structure of a safety switch according to claim 1, wherein the contact piece is a composite metal sheet, and is deformed and bent to one side when heated.

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