CN221226045U - Improved structure of switch device - Google Patents

Abstract

An improved structure of switch device has a hollow shell body with a circular through hole on the top, a metal lining ring in the through hole, a linkage piece with a linkage rod with circular section and support arms at two sides of the linkage piece, a metal cylinder or tube structure formed by the linkage rod and closely attached to the inner side of the lining ring, and a stable elastic support for the linkage rod; therefore, the return spring of the key of the conventional switch is limited by the structure space of the shell which cannot move for a longer stroke, and the clearance between the key and the shell which is in sliding fit is larger to influence the action.

Description

Improved structure of switch device

Technical Field

The present utility model relates to an improved structure of a switch device, and more particularly to a switch structure with smooth switch operation, good sealing effect and ensured overall use quality.

Background

As shown in fig. 1 and 2, the internal structure of a conventional switch body that can be driven to change on or off state (e.g. micro switch) mainly comprises: a housing body 10, a linkage member 20, a terminal assembly 3 and a driven mechanism 4; the shell body 10 is formed by combining a shell seat 101 and a shell cover 102, a square through hole 103 is arranged at the top of the shell body 10, and supporting parts 104 are respectively arranged at two sides of the shell body 10 below the through hole 103 and can be respectively supported at the middle sections of the two forced separation sheets 105; the housing 101 is provided with a combination hole 106, the housing cover 102 is provided with a combination hole 107, and a plurality of housing bodies 10 can be connected in series and combined with each other by a connecting assembly (which can be a bolt, not shown) respectively penetrating through the combination holes 106, 107 of the housing bodies 10 corresponding to the combination hole 106.

The linkage member 20 is disposed in the housing body 10, the linkage member 20 has a linkage rod 201 with a square cross-section, and can extend out of the housing body 10 through the through hole 103, an elastic element 202 is disposed in the linkage rod 201 and abuts against the top of the housing body 10, the linkage member 20 has support arms 203 disposed at two sides of the linkage rod 201, and each support arm 203 extends toward one end of the two forced release pieces 105 close to two sides of the housing body 10, and the middle sections of the two support arms 203 abut against one ends of two obliquely extending elastic pushing members 204.

The terminal assembly 3 has two normally open terminals 31, 32 and two normally closed terminals 33, 34 inside the case body 10, the normally open terminals 31, 32 and the normally closed terminals 33, 34 extending outward in part, respectively; normally open terminal contacts 311, 321 are provided at the ends of the normally open terminals 31, 32 located in the case body 10, respectively, and normally closed terminal contacts 331, 341 are provided at the ends of the normally closed terminals 33, 34 located in the case body 10, respectively.

The driven mechanism 4 is arranged in the shell body 10, the driven mechanism 4 is provided with a driven part 41, normally open contacts 42 and 43 which are communicated with each other and normally closed contacts 44 and 45 which are communicated with each other, and the normally open contacts 42 and 43 and the normally closed contacts 44 and 45 form synchronous linkage with the driven part 41; two sides of the upper part of the driven part 41 are respectively sleeved at the other ends of the two elastic pushing and pulling pieces 204, and two sides of the lower part of the driven part 41 are respectively assembled at one ends of the two forced disengaging pieces 105 close to the middle of the shell body 10; the normally open contacts 42, 43 correspond to the normally open terminal contacts 311, 321, respectively, and the normally closed contacts 44, 45 correspond to the normally closed terminal contacts 331, 341, respectively.

Referring to fig. 2 and 3, when the link 201 of the link 20 is in a natural state without external force, the link 201 is elastically pressed to the uppermost position by the elastic element 202, so that the two arms 203 of the link 20 are separated from the forced separation plates 105; at this time, the two elastic pushing members 204 generate oblique forces to respectively push against the driven portion 41 and the two supporting arms 203, and the driven portion 41 is forced downward and links the two normally-closed contacts 44 and 45 to respectively contact the normally-closed terminal contacts 331 and 341 of the terminal assembly 3, so that the two normally-closed terminals 33 and 34 are in a mutually conductive state, and the two normally-open contacts 42 and 43 are respectively separated from the normally-open terminal contacts 311 and 321 of the terminal assembly 3, so that the normally-open terminals 31 and 32 are in an open state (as shown in fig. 2); when the linkage rod 201 of the linkage member 20 is acted by an external force (such as a driving rod a of a micro switch), the elastic element 202 can be compressed, and meanwhile, the middle sections of the two support arms 203 of the linkage member 20 respectively push and compress the two elastic pushing and pulling members 204, so that the two elastic pushing and pulling members 204 can turn over and reversely push and pull the driven portion 41 upwards, the driven portion 41 is utilized to link the two normally-closed contacts 44 and 45 to be separated from the normally-closed terminal contacts 331 and 341 of the terminal assembly 3 respectively, so that the normally-closed terminals 33 and 34 are in a disconnection state, and the two normally-open contacts 42 and 43 are respectively contacted with the normally-open terminal contacts 311 and 321 of the terminal assembly 3, so that the normally-open terminals 31 and 32 are in a mutual conduction state (as shown in fig. 3); in practical application, if the two normally-closed contacts 44 and 45 are not easily separated from the two normally-closed terminal contacts 331 and 341 due to contact adhesion, the two arms 203 of the linkage 20 can be used to respectively press one ends of the two forced separation sheets 105 at the end of the actuation stroke, so that the other ends of the two forced separation sheets 105 are tilted upward and drive the driven portion 41 to move upward.

However, the above structure has the following disadvantages in practical application: firstly, the tolerance of the housing 101 and the housing cover 102 is limited by the manufacturing and forming tolerance of the housing 101 and the housing cover 102, so that the edges of the square through holes 103 formed after the housing 101 and the housing cover 102 are combined may be partially misplaced or not be tightly adhered, and therefore, the size of the through holes 103 is mostly enlarged during design to absorb the tolerance of the housing 101 and the housing cover 102; in this way, the square through hole 103 with the edge having the dislocation and the larger size cannot form the sealing with the periphery of the square linkage rod 201, so that the external dust or the tiny foreign matters easily fall into the shell body 10 through the gap between the through hole 103 and the linkage rod 201, and the smoothness of the internal operation and the contact conduction effect of each contact are affected.

Meanwhile, the structure that the square-section linkage rod 201 is combined in the square through hole 103 and is supported inside the linkage rod 201 by matching with the single elastic element 202 can not provide stable support for the linkage rod 201, when external force acts on the linkage rod 201 in a skew direction (such as a driving rod A extending obliquely of a micro switch), the linkage rod 201 is easy to skew or shake in a stress direction, so that the linkage rod 201 can generate a great contact friction force on one side surface facing to the skew direction and corresponding to the through hole 103, not only the action smoothness of the linkage piece 20 can be affected, but also a large gap can be formed between the linkage rod 201 and the shell seat 101 and the shell cover 102 under the condition of long-term or high-frequency operation, and the situation is not expected.

In addition, since the elastic element 202 is disposed inside the link 201, the space limited by the overall structure cannot be used for the long elastic element 202; in this way, the moving stroke of the link 201 is limited, so that the service life of the elastic element 202 is limited as well as the requirement of long stroke operation cannot be met.

In view of the above-mentioned drawbacks of the conventional switch mechanism, the inventors have studied improvements against these drawbacks, and have finally produced the present utility model.

Disclosure of utility model

The utility model mainly aims at providing an improved structure of a switch device, which is provided with a hollow shell body, wherein a circular through hole is formed in the top of the shell body, a metal lining ring is arranged in the through hole, a linkage piece, a terminal component and a driven mechanism are arranged in the shell body, the linkage piece is provided with a linkage rod with a circular section and support arms positioned at two sides of the linkage piece, the linkage rod extends out of the shell body through the through hole, the linkage rod can form a metal cylinder or a pipe body structure and is closely attached to the inner peripheral side of the lining ring, and each support arm is propped against the inside of the shell body through an elastic element respectively and can form stable elastic support for the linkage rod, which is not easy to skew; the restoring spring of the key of the conventional switch is limited by the structural space of the shell and can not move for a longer stroke, and the gap between the key and the shell in sliding fit is larger to influence the operation.

Another object of the present utility model is to provide an improved structure of a switch device, wherein a metal bushing ring is disposed in the through hole, so as to form a complete circle shape in the through hole, thereby correcting the dislocation or unevenness of the joint portion of the combined through hole caused by manufacturing tolerances of the housing base and the housing cover; and the metal surface of the linkage rod can improve the service life and the activity precision of the linkage rod.

Another object of the present utility model is to provide an improved structure of a switch device, in which two forced disengaging pieces capable of being driven by the two support arms are symmetrically pivoted inside the housing body, and when the driven mechanism is disabled, the driven mechanism can be linked to maintain the due control activity through the two forced disengaging pieces; the forced disengaging pieces are respectively provided with a concave notch at one end facing the elastic element, so that interference to the movement of the elastic element can be avoided.

In order to achieve the above objects and effects, the present utility model is implemented by the following technical means: an improved structure of a switching device at least comprises: a hollow shell body, the top of which is provided with a through hole; the linkage piece is assembled in the shell body and provided with a linkage rod with a circular section, the linkage rod extends outwards from the shell body through the through hole, the linkage piece is provided with two symmetrical support arms, and the side parts of the support arms are respectively connected in the shell body through an elastic element, so that the stable and balanced restoring elasticity of the linkage rod of the linkage piece can be kept when the linkage rod is pressed; a terminal assembly disposed in the housing body and having a plurality of terminals; a driven mechanism is disposed within the housing body and is responsive to the movement of the arm to change the on and off states between the terminals of the terminal assembly.

According to the structure, the linkage rod is a structure body with a circular section; a metal lining ring is arranged in the through hole of the shell body and can be closely sleeved on the periphery side of the linkage rod.

According to the structure, the linkage rod is formed by combining a middle convex column convexly arranged on the linkage piece and a metal sleeve cap sleeved outside the middle convex column.

According to the structure, two forced disengaging pieces are symmetrically pivoted in the shell body and respectively positioned at two sides of the through hole correspondingly, and each forced disengaging piece can be driven by the support arm of the linkage piece so as to enable at least one end part to swing; the driven mechanism is provided with a driven part connected with the two forced disengaging pieces, and the driven part can be driven by the two forced disengaging pieces to change the conducting state and the breaking state between the terminals.

According to the above structure, each of the forced disengaging pieces is provided with a notch at one end facing the elastic element, so as to avoid interference with the movement of each elastic element.

According to the structure, the shell body is provided with a shell seat and a shell cover, a first combined hole is formed in the shell seat, and a first combined sleeve is accommodated in the first combined hole; the shell cover is provided with a second combined hole corresponding to the first combined hole of the shell seat, a second combined sleeve is accommodated in the second combined hole, and a connecting assembly penetrates through the first combined sleeve and the second combined sleeve of different shell bodies respectively, so that a plurality of shell bodies can be connected in series.

According to the above structure, the first combined hole is provided with a first annular concave edge at the periphery of one end close to the outer surface side of the shell seat, and the periphery of one end of the first combined sleeve is provided with a first annular flange corresponding to the first annular concave edge; the second combined hole is provided with a second annular concave edge in a surrounding way at the periphery of one end close to the outer side of the shell cover, and a second annular flange corresponding to the second annular concave edge is arranged at the periphery of one end of the second combined sleeve.

According to the structure, the surface of the shell seat is concavely provided with the first positioning hole, and the surface of the shell cover is concavely provided with the second positioning hole corresponding to the first positioning hole of the shell seat; and a positioning piece is inserted between the first positioning hole of the shell body and the second positioning hole of the adjacent other shell body.

According to the structure, the terminal assembly is provided with at least one group of normally open terminals, and each normally open terminal extends to the outside of the shell body through one end; one end of each normally open terminal extending into the shell body is provided with a normally open terminal contact; the driven mechanism is provided with a group of normally open contacts which are communicated with each other and respectively correspond to the normally open terminal contacts, and each normally open contact and the driven part form linkage so as to change the on-off state between the normally open terminals.

According to the structure, the terminal assembly is provided with at least one group of normally-closed terminals, and each normally-closed terminal extends to the outside of the shell body through one end; one end of each normally-closed terminal extending into the shell body is provided with a normally-closed terminal contact; the driven mechanism is provided with a group of normally-closed contacts which are communicated with each other and respectively correspond to the normally-closed terminal contacts, and each normally-closed contact and the driven part form linkage so as to change the on-off state between the normally-closed terminals.

Drawings

So that the manner in which the above recited objects, features and features of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized below, may be had by reference to the appended drawings.

FIG. 1 is a schematic diagram of a conventional switching device.

FIG. 2 is a schematic diagram of the switch device of FIG. 1 in a natural state when not in operation.

FIG. 3 is a schematic diagram of the internal operation of the switch device of FIG. 1 when driven.

FIG. 4 is a perspective exploded view of the present utility model.

FIG. 5 is a partially assembled schematic illustration of the present utility model.

FIG. 6 is a schematic diagram of the natural state of the present utility model when not in operation. FIG. 7 is a schematic diagram of the internal operation of the present utility model when driven. FIG. 8 is a diagram of a combined application embodiment of the present utility model.

The reference symbols in the drawings indicate:

1. 10 Shell body

11. 101 Casing base

106. 107 Combined hole

111 First combined hole

112 First annular concave edge

113 First combined sleeve

114 First ring flange

115 First positioning hole

12. 102 Casing cover

121 Second combined hole

122 Second annular concave edge

123 Second combined sleeve

124 Second ring flange

125 Second positioning hole

13. 103 Through holes

131 Bushing ring

14. 104 Supporting part

141 Stop part

15. 105 Forced release sheet

151 Concave notch

2. 20 Linking piece

21. 201 Linkage rod

211 Middle convex column

212 Metal cap

22. 202 Elastic element

23. 203 Support arm

231 Side convex part

24. 204 Elastic pushing and pulling piece

3 Terminal assembly

31. 32 Normally open terminal

311. 321 Normally open terminal contact

33. 34 Normally closed terminal

331. 341 Normally closed terminal contact

4 Driven mechanism

41 Driven part

42. 43 Normally open contact

44. 45 Normally closed contact

A is a driving rod

B locating piece

C, connecting assembly

Detailed Description

Referring to fig. 4 and 5, it can be seen that the main structure of the present utility model includes: a shell body 1, a linkage member 2, a terminal assembly 3 and a driven mechanism 4; the shell body 1 may be a hollow structure formed by combining a shell seat 11 and a shell cover 12, a circular through hole 13 is provided at the top of the shell body 1, supporting portions 14 are respectively provided at two sides of the shell body 1 below the through hole 13, the supporting portions may be respectively supported at middle sections of two symmetrically arranged forced disengaging pieces 15, and a blocking portion 141 is respectively provided at each supporting portion 14 side.

In the above structure, the inner periphery of the through hole 13 may be sleeved with a collar 131 as required, and the integrally formed collar 131 is utilized to form a complete arc shape of the edge in the through hole 13, so as to correct the situation that the joint part of the through hole 13 of the housing 11 and the housing cover 12 is misplaced or uneven due to manufacturing tolerance; meanwhile, the bushing ring 131 may be made of metal or other wear-resistant materials, so as to improve the overall wear-resistant property and the service life of the housing body 1.

In a possible embodiment, the housing 11 is provided with a first through-hole 111, a first annular concave edge 112 is disposed around an end periphery of the first through-hole 111 near the outer surface of the housing 11, a first combined sleeve 113 is received in the first through-hole 111, a first annular flange 114 (with a larger outer diameter) corresponding to the first annular concave edge 112 is disposed around an end periphery of the first combined sleeve 113, and a first positioning hole 115 (as shown in fig. 8) is concavely disposed around the outer surface of the housing 11; the cover 12 is provided with a second through hole 121 corresponding to the first through hole 111, the second through hole 121 is provided with a second annular concave edge 122 at a periphery of one end close to the outer surface of the cover 12, a second combined sleeve 123 is accommodated in the second through hole 121, one periphery of one end of the second combined sleeve 123 is provided with a second annular flange 124 (with larger outer diameter) corresponding to the second annular concave edge 122, and a second positioning hole 125 is concavely arranged on the surface of the cover 12 corresponding to the first positioning hole 115.

The linkage member 2 is assembled in the shell body 1 and provided with a linkage rod 21 with a circular section, the linkage rod 21 can extend outwards from the interior of the shell body 1 through the through hole 13 (bushing ring 131), the two sides of the linkage rod 21 of the linkage member 2 are respectively provided with a support arm 23, and the support arms respectively extend towards one end parts of the two forced disengaging pieces 15 close to the two sides of the shell body 1; the middle sections of the two support arms 23 respectively support against one ends of the two obliquely extending elastic pushing and pulling members 24, and a side protrusion 231 is respectively disposed beside each support arm 23 for positioning one end of each elastic element 22, and the other ends of the elastic elements 22 support against the stop portion 141, so that the linkage rod 21 can maintain stable support and return elasticity when being pressed.

In the above structure, the linkage rod 21 may be formed by combining a middle protrusion 211 protruding on the linkage member 2 and a metal cap 212 sleeved outside the middle protrusion 211, and the metal cap 212 can form a seal with the bushing ring 131, so as to effectively reduce the possibility that external dust or micro-foreign matters easily fall into the shell body 1 through the gap between the bushing ring 131 and the metal cap 212; meanwhile, the metal cap 212 and the bushing ring 131 have wear-resistant properties, so that the service life of the product can be prolonged.

Furthermore, the end of each of the forced releasing plates 15 facing the elastic element 22 may be provided with a notch 151 as required to avoid interference with the movement of each elastic element 22.

The terminal assembly 3 is assembled inside the shell body 1 and is provided with at least one group of normally open terminals 31 and 32 and at least one group of normally closed terminals 33 and 34, and the normally open terminals 31 and 32 and the normally closed terminals 33 and 34 respectively extend to the outside of the shell body 1 from one end; the normally open terminals 31 and 32 are provided with normally open terminal contacts 311 and 321 at the ends extending into the case body 1, respectively, and the normally closed terminals 33 and 34 are provided with normally closed terminal contacts 331 and 341 at the ends extending into the case body 1, respectively.

The driven mechanism 4 is arranged in the shell body 1 and is provided with a driven part 41, normally-open contacts 42 and 43 which are communicated with each other and normally-closed contacts 44 and 45 which are communicated with each other, and the normally-open contacts 42 and 43 and the normally-closed contacts 44 and 45 form synchronous linkage with the driven part 41; the upper sides of the driven portion 41 are respectively sleeved at the other ends of the two elastic pushing members 24, the lower portion of the driven portion 41 is connected to one end of the two forced disengaging pieces 15 close to the middle of the shell body 1, the normally open contacts 42 and 43 correspond to the normally open terminal contacts 311 and 321 respectively, and the normally closed contacts 44 and 45 correspond to the normally closed terminal contacts 331 and 341 respectively.

Referring to fig. 6 and 7, in a natural state of the linkage rod 21 of the linkage member 2 without external force, the linkage rod 21 is elastically supported to the uppermost position by the two elastic elements 22, so that the two support arms 23 of the linkage member 2 are separated from the forced separation plates 15; at this time, the two elastic pushing members 24 generate oblique forces to respectively push against the driven portion 41 and the two supporting arms 23, and the linkage member 2 cannot move upward any more, so that the driven portion 41 is forced downward and links the two normally-closed contacts 44 and 45 to respectively contact the normally-closed terminal contacts 331 and 341 of the terminal assembly 3, so that the two normally-closed terminals 33 and 34 are in a mutually conductive state, and the two normally-open contacts 42 and 43 are respectively separated from the normally-open terminal contacts 311 and 321 of the terminal assembly 3, so that the normally-open terminals 31 and 32 are in an open state (as shown in fig. 6); when the linkage rod 21 of the linkage member 2 is acted by an external force (such as a driving rod a of a micro switch), the two elastic elements 22 can be compressed, and the middle sections of the two support arms 23 of the linkage member 2 respectively push and compress the two elastic pushing and pulling members 24, so that the two elastic pushing and pulling members 24 can turn over and reversely push and pull the driven portion 41 to move upwards, the driven portion 41 is utilized to link the two normally-closed contacts 44 and 45 to be separated from the normally-closed terminal contacts 331 and 341 of the terminal assembly 3 respectively, so that the normally-closed terminals 33 and 34 are in a disconnection state, and the two normally-open contacts 42 and 43 are respectively contacted with the normally-open terminal contacts 311 and 321 of the terminal assembly 3, so that the normally-open terminals 31 and 32 are in a mutual conduction state (as shown in fig. 7); in practical application, if the two normally-closed contacts 44 and 45 are not easily separated from the two normally-closed terminal contacts 331 and 341 due to contact adhesion, the two arms 23 of the linkage member 2 can be used to respectively press one ends of the two forced separation sheets 15 at the end of the actuation stroke, so that the other ends of the two forced separation sheets 15 are tilted upward and drive the driven portion 41 to move upward.

Referring to fig. 8, when there is a requirement for parallel combination of multiple shell bodies 1, a shaft tube type positioning element B can be inserted between the first positioning hole 115 (or the second positioning hole 125) of one shell body 1 and the second positioning hole 125 (or the first positioning hole 115) of another adjacent shell body 1, so as to form a simple temporary positioning, so as to overcome the disadvantage that the conventional multiple shell bodies 1 are not easy to position when being parallel; the connecting assembly C penetrates through the first and second combination holes 111 and 121 of the plurality of shell bodies 1 respectively, and the first and second combination sleeves 113 and 123 with better structural strength can form complete protection inside the first and second combination holes 111 and 121 respectively, so that the situation that the shell seat 11 and the shell cover 12 are broken due to improper force application can be effectively avoided.

In view of the above, the improved structure of the switch device of the present utility model can achieve the effects of improving the smoothness of the switch operation, improving the sealing effect and ensuring the overall use quality, and is a novel and advanced utility model, and the patent of the utility model is filed by law; however, the above description is only illustrative of the preferred embodiments of the present utility model, and variations, modifications, changes or equivalents may be made therein which fall within the scope of the present utility model.

Claims (16)

1. An improved structure of a switching device, characterized in that the improved structure of the switching device at least comprises:

a hollow shell body (1), the top of which is provided with a through hole (13);

A linkage member (2) assembled in the shell body (1), wherein the linkage member (2) is provided with a linkage rod (21) with a circular section, the linkage member (2) extends outwards from the interior of the shell body (1) through the through hole (13), the linkage member (2) is provided with two symmetrical support arms (23), and the side parts of the support arms (23) are respectively connected in the shell body (1) through elastic elements (22) so that the linkage rod (21) of the linkage member (2) can keep stable and balanced restoring elasticity when being pressed;

a terminal assembly (3) arranged in the shell body (1) and provided with a plurality of terminals;

A follower (4) provided in the housing body (1) and capable of changing the on and off states between the terminals of the terminal assembly (3) in response to the movement of the arm (23), respectively.

2. The improved structure of a switching device according to claim 1, wherein the link lever (21) is a structural body of circular cross section; a metal bushing ring (131) is arranged in the through hole (13) of the shell body (1) and can be closely sleeved on the outer periphery side of the linkage rod (21).

3. The improved structure of the switching device according to claim 2, wherein the linkage rod (21) is composed of a middle convex column (211) protruding on the linkage member (2) and a metal sleeve cap (212) sleeved outside the middle convex column (211).

4. A switch device improvement structure according to any one of claims 1-3, characterized in that two forced disengaging pieces (15) are symmetrically pivoted in the shell body (1), and are respectively positioned at two sides of the through hole (13), and the forced disengaging pieces (15) can be driven by the support arm (23) of the linkage piece (2) so as to make at least one end part generate a deflection movement; the driven mechanism (4) is provided with a driven part (41) connected with the two forced disengaging pieces (15), and the driven part (41) can be driven by the forced disengaging pieces (15) to change the conducting state and the breaking state between the terminals.

5. The improvement as claimed in claim 4, wherein said forced disengaging pieces (15) are respectively provided with notches (151) at one ends facing said elastic element (22) so as to avoid interference with the movement of said elastic element (22).

6. A switching device improvement according to any one of claims 1-3, wherein the housing body (1) has a housing seat (11) and a housing cover (12), a first combination hole (111) is provided on the housing seat (11), and a first combination sleeve (113) is received in the first combination hole (111); the shell cover (12) is provided with a second combination hole (121), the second combination hole (121) corresponds to the first combination hole (111) of the shell seat (11), a second combination sleeve (123) is accommodated in the second combination hole (121), and a connecting assembly (C) respectively penetrates through the first combination sleeve (113) and the second combination sleeve (123) of different shell bodies (1), so that a plurality of shell bodies (1) can be connected in series.

7. The improved structure of the switching device according to claim 4, wherein the housing body (1) has a housing seat (11) and a housing cover (12), a first combination hole (111) is provided on the housing seat (11), and a first combination sleeve (113) is received in the first combination hole (111); the shell cover (12) is provided with a second combination hole (121), the second combination hole (121) corresponds to the first combination hole (111) of the shell seat (11), a second combination sleeve (123) is accommodated in the second combination hole (121), and a connecting assembly (C) respectively penetrates through the first combination sleeve (113) and the second combination sleeve (123) of different shell bodies (1), so that a plurality of shell bodies (1) can be connected in series.

8. The improved structure of the switching device according to claim 5, wherein the housing body (1) has a housing seat (11) and a housing cover (12), a first combination hole (111) is provided on the housing seat (11), and a first combination sleeve (113) is received in the first combination hole (111); the shell cover (12) is provided with a second combination hole (121), the second combination hole (121) corresponds to the first combination hole (111) of the shell seat (11), a second combination sleeve (123) is accommodated in the second combination hole (121), and a connecting assembly (C) respectively penetrates through the first combination sleeve (113) and the second combination sleeve (123) of different shell bodies (1), so that a plurality of shell bodies (1) can be connected in series.

9. The improved structure of the switching device according to claim 6, wherein the first combining hole (111) is provided with a first annular concave edge (112) at a periphery of one end close to the outer surface side of the housing seat (11), and a first annular flange (114) corresponding to the first annular concave edge (112) is provided at a periphery of one end of the first combining sleeve (113); the second combined hole (121) is provided with a second annular concave edge (122) in a surrounding manner near one end periphery of the outer surface side of the shell cover (12), and one end periphery of the second combined sleeve (123) is provided with a second annular flange (124) corresponding to the second annular concave edge (122).

10. The improved structure of the switching device according to claim 7, wherein the first combining hole (111) is provided with a first annular concave edge (112) at a periphery of one end close to the outer surface side of the housing seat (11), and a first annular flange (114) corresponding to the first annular concave edge (112) is provided at a periphery of one end of the first combining sleeve (113); the second combined hole (121) is provided with a second annular concave edge (122) in a surrounding manner near one end periphery of the outer surface side of the shell cover (12), and one end periphery of the second combined sleeve (123) is provided with a second annular flange (124) corresponding to the second annular concave edge (122).

11. The improved structure of the switching device according to claim 8, wherein the first combining hole (111) is provided with a first annular concave edge (112) at a periphery of one end close to the outer surface side of the housing seat (11), and a first annular flange (114) corresponding to the first annular concave edge (112) is provided at a periphery of one end of the first combining sleeve (113); the second combined hole (121) is provided with a second annular concave edge (122) in a surrounding manner near one end periphery of the outer surface side of the shell cover (12), and one end periphery of the second combined sleeve (123) is provided with a second annular flange (124) corresponding to the second annular concave edge (122).

12. The improved structure of the switch device according to claim 6, wherein a first positioning hole (115) is concavely formed on the surface of the housing base (11), and a second positioning hole (125) is concavely formed on the surface of the housing cover (12) corresponding to the first positioning hole (115) of the housing base (11); and a positioning piece (B) is inserted between the first positioning hole (115) of the shell body (1) and the second positioning hole (125) of the adjacent other shell body (1).

13. The improved structure of the switch device according to claim 7, characterized in that the surface of the housing base (11) is concavely provided with a first positioning hole (115), and the surface of the housing cover (12) is concavely provided with a second positioning hole (125) corresponding to the first positioning hole (115) of the housing base (11); and a positioning piece (B) is inserted between the first positioning hole (115) of the shell body (1) and the second positioning hole (125) of the adjacent other shell body (1).

14. The improved structure of the switch device according to claim 8, characterized in that the surface of the housing base (11) is concavely provided with a first positioning hole (115), and the surface of the housing cover (12) is concavely provided with a second positioning hole (125) corresponding to the first positioning hole (115) of the housing base (11); and a positioning piece (B) is inserted between the first positioning hole (115) of the shell body (1) and the second positioning hole (125) of the adjacent other shell body (1).

15. The improved structure of a switching device according to claim 4, characterized in that the terminal assembly (3) has at least one set of normally open terminals (31), (32), the normally open terminals (31), (32) extending with one end to the outside of the case body (1), respectively; the ends of the normally open terminals (31) and (32) extending into the shell body (1) are respectively provided with normally open terminal contacts (311) and (321); the driven mechanism (4) is provided with a group of normally open contacts (42) and (43) which are communicated with each other and correspond to the normally open terminal contacts (311) and (321), and the normally open contacts (42) and (43) are interlocked with the driven part (41), so that the on-off state and the off-state between the normally open terminals (31) and (32) are changed.

16. The improved structure of a switching device according to claim 4, characterized in that the terminal assembly (3) has at least one set of normally closed terminals (33), (34), the normally closed terminals (33), (34) extending with one end to the outside of the case body (1), respectively; the normally closed terminals (33) and (34) are respectively provided with normally closed terminal contacts (331) and (341) at one ends extending into the shell body (1); the driven mechanism (4) is provided with a group of normally-closed contacts (44) and (45) which are communicated with each other and correspond to the normally-closed terminal contacts (331) and (341), and the normally-closed contacts (44) and (45) are interlocked with the driven part (41) so as to change the on-off state between the normally-closed terminals (33) and (34).