An electric tool switch with strong waterproof and dustproof performance

Abstract

The present invention relates to an electric tool switch with strong waterproof and dustproof performance, which includes a housing. A switch circuit is arranged inside the housing. A push rod hole is opened on the housing. A push rod is inserted into the push rod hole. One end of the push rod is inserted into the housing to control the opening and closing of the switch circuit, and the other end extends outside the housing. A first annular sealing groove is opened on the inner wall of the push rod hole. A circumferentially extending second annular sealing groove is opened on the outer wall of the end of the push rod away from the housing. A dustproof sleeve is sleeved on the push rod. A first sealing convex ring that cooperates with the first annular sealing groove is formed by the radial outward protrusion of the outer wall of one end of the dustproof sleeve. A second sealing convex ring that is tightly fitted with the second annular sealing groove is formed by the radial inward protrusion of the inner wall of the other end of the dustproof sleeve. A snap ring is also clamped in the push rod hole, and the snap ring tightly presses the first sealing convex ring in the first annular sealing groove.

Description

Technical Field

[0001] The invention belongs to the technical field of switches, and particularly relates to an electric tool switch with strong waterproof and dustproof performance. Background Art

[0002] With the continuous optimization of electric tools, their application scenarios are becoming more and more diverse, including dusty environments, humid environments, and even underwater operations. Therefore, electric tools have higher and higher requirements for the waterproof and dustproof performance of switches, while the existing switches cannot meet such high dustproof and waterproof requirements. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to provide an electric tool switch with strong waterproof and dustproof performance.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: an electric tool switch with strong waterproof and dustproof performance, including a housing. A switch circuit is arranged inside the housing. A push rod hole is opened on the housing. A push rod is inserted into the push rod hole. One end of the push rod is inserted into the housing to control the opening and closing of the switch circuit, and the other end extends out of the housing. A first annular sealing groove is opened on the inner wall of the push rod hole. A circumferentially extending second annular sealing groove is opened on the outer wall of the end of the push rod away from the housing. A dustproof sleeve is sleeved on the push rod. One end of the dustproof sleeve has an outer wall radially protruding outward to form a first sealing convex ring that cooperates with the first annular sealing groove. The inner wall of the other end of the dustproof sleeve radially protrudes inward to form a second sealing convex ring that is tightly fitted with the second annular sealing groove. A snap ring is also clamped in the push rod hole, and the snap ring tightly presses the first sealing convex ring in the first annular sealing groove.

[0005] As a preferred solution, the push rod hole includes a guiding section and a clamping section. The guiding section is located at the inner end of the push rod hole, and the clamping section is located at the outer end of the push rod hole. The inner diameter of the guiding section is smaller than that of the clamping section. The first annular sealing groove is arranged on the clamping section, and the snap ring is installed in the clamping section.

[0006] As a preferred solution, a reversing hole communicating with the inside of the housing is also opened on the housing. A reversing rotating shaft is rotatably inserted into the reversing hole. One end of the reversing rotating shaft is inserted into the housing, and the other end extends out of the housing and is connected with a dial handle. A connecting groove coaxial with the reversing hole is opened on the side of the dial handle facing the reversing hole. A third annular sealing groove is coaxially arranged around the connecting groove. The outer wall of the housing at the four peripheral edges of the reversing hole axially protrudes outward to form an inner dustproof ring inserted into the connecting groove. An outer dustproof ring inserted into the third annular sealing groove is coaxially arranged outside the inner dustproof ring. The lower end of the outer dustproof ring is fixedly and sealedly connected to the outer wall of the housing. The third annular sealing groove, the outer dustproof ring, the connecting groove, and the inner dustproof ring together form a labyrinth seal, and grease is filled between the outer dustproof ring and the inner dustproof ring.

[0007] As a preferred solution, the commutation rotating shaft includes a small-diameter section that fits with the commutation hole and a large-diameter section located inside the housing. The large-diameter section and the small-diameter section are coaxial, the diameter of the large-diameter section is greater than that of the small-diameter section, and one end where the large-diameter section is connected to the small-diameter section forms an annular end face. This annular end face faces the inner wall of the housing. A third sealing convex ring coaxial with the small-diameter section is provided on this annular end face. A fourth annular sealing groove that cooperates with the third sealing convex ring is provided on the inner wall of the housing opposite to the annular end face. The third sealing convex ring is inserted into the fourth annular sealing groove. Grease is filled between the third sealing convex ring and the small-diameter section. The inner wall of the housing between the fourth annular sealing groove and the commutation hole is inserted into the grease.

[0008] As a preferred solution, the housing includes a base and an upper cover that are connected in an opposing and mating manner. The push rod holes are evenly distributed on the same end face of the base and the upper cover. The upper end of the base is open, and a sealing groove extending along the side wall of the base is provided on the end face of the open end. The sealing groove extends all the way to the end face where the guiding section of the push rod hole faces the clamping section. A sealing rubber strip is embedded in the sealing groove. The end of the sealing rubber strip extends into the clamping section of the push rod hole and tightly abuts against the snap ring. The lower end of the upper cover is open, and a sealing convex strip corresponding to the sealing groove is provided on the lower end face of the upper cover. The sealing convex strip is inserted into the sealing groove and presses the sealing rubber strip.

[0009] As a preferred solution, a wire discharge groove extending upward from the lower edge is provided on the side plate of the upper cover on the side opposite to the push rod hole. An insertion plate that cooperates with the wire discharge groove and can be inserted into the wire discharge groove to press the wire harness is provided on the base. The insertion plate is integrally formed with the side plate of the base and extends upward from the upper edge of the side plate of the base. The sealing groove extends to both side faces of the insertion plate. The sealing convex strip extends to both side faces of the wire discharge groove. The wire discharge groove and the insertion plate form a wire harness hole. A wire harness is crimped in the wire harness hole. One end of the wire harness extends into the housing and is connected to the switch circuit, and the other end is exposed outside the housing. The gap between the wire harness hole and the wire harness is filled with sealing glue. The sealing groove extends all the way to the wire harness hole, and the sealing rubber strip in the sealing groove is hermetically bonded to the sealing glue in the wire harness hole.

[0010] The beneficial effects of the present invention are as follows: By sleeving a dust-proof sleeve on the push rod and hermetically connecting one end of the dust-proof sleeve to the hole wall of the push rod hole with a snap ring and the other end of the dust-proof sleeve to the push rod, the present invention realizes the sealed isolation between the push rod hole and the outside world, achieving the technical effect of dust-proof and waterproof for the switch.

[0011] The present invention further provides a clamping section with a diameter larger than the guiding section of the push rod hole to provide a space for accommodating the dust-proof sleeve and the snap ring, increase the thickness of the snap ring, strengthen the pressing force of the snap ring against and squeezing the first sealing convex ring of the dust-proof sleeve, improve the sealing effect between the first sealing convex ring and the first annular sealing groove, and enhance the dust-proof and waterproof effect of the switch.

[0012] The present invention further realizes the sealing isolation between the commutation hole and the outside by arranging a labyrinth seal between the dial handle and the switch housing and injecting grease into the labyrinth seal, further achieving the technical effect of dust and water protection for the switch.

[0013] The present invention further sets a third sealing convex ring on the annular end surface of the large-diameter section of the commutation rotating shaft, opens a fourth annular sealing groove on the inner wall of the housing to cooperate with the third sealing convex ring, and further injects grease between the third sealing convex ring and the small-diameter section, so that the inner wall of the housing between the fourth annular sealing groove and the commutation hole is inserted into the grease, further ensuring the sealing isolation between the commutation hole and the outside and further improving the technical effect of dust and water protection for the switch.

[0014] The present invention further makes the base and the upper cover of the housing be hermetically butted through a sealing strip, and uses a sealing groove to embed the sealing strip to improve the stability of the sealing strip, avoiding the sealing failure caused by the dislocation of the sealing strip. At the same time, the sealing convex strip is inserted into the sealing groove to extrude the sealing strip to ensure the sealing effect of the sealing strip, and at the same time improve the butting accuracy between the base and the upper cover, avoiding the aging of the sealing strip when exposed to light, and prolonging the sealing effect and service life of the switch.

[0015] The present invention further realizes the sealing isolation between the wire arranging hole and the outside by filling sealant in the gap between the wire arranging hole and the wire, achieving the technical effect of dust and water protection for the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further describes in detail the specific embodiments of the present invention with reference to the drawings, where:

[0017] Figure 1 is an exploded view of the present invention;

[0018] Figure 2 is a half-sectional view of the assembled state of the present invention;

[0019] Figure 3 is an exploded structural schematic diagram of the commutation rotating shaft, the dial handle and the upper cover of the present invention;

[0020] Figure 4 is a schematic diagram of the connection structure of the housing;

[0021] Figures 1 to 4Chinese: 1. Housing, 101. Base, 102. Upper cover, 2. Switch circuit, 3. Push rod hole, 301. Guide section, 302. Clamping section, 4. Push rod, 5. First annular sealing groove, 6. Second annular sealing groove, 7. Dust-proof sleeve, 8. First sealing convex ring, 9. Second sealing convex ring, 10. Snap ring, 11. Commutation hole, 12. Commutation rotating shaft, 1201. Small diameter section, 1202. Large diameter section, 1203. Annular end face, 13. Dial handle, 14. Connecting groove, 15. Third annular sealing groove, 16. Inner dust-proof ring, 17. Outer dust-proof ring, 18. Third sealing convex ring, 19. Fourth annular sealing groove, 20. Sealing groove, 21. Sealing rubber strip, 22. Sealing rib, 23. Wiring groove, 24. Wiring, 25. Plug board, 26. Wiring hole, 27. Sealing glue, 28. Button. Detailed implementation mode

[0022] The following combines the attached drawings to describe the specific implementation plan of the present invention in detail.

[0023] As Figure 1 And Figure 2 Shown is an electric tool switch with strong waterproof and dustproof performance, including a housing 1. A switch circuit 2 is arranged inside the housing 1. The switch circuit is a conventional circuit, which can be an integrated PCB board integrated circuit or a traditional mechanical connection circuit. A push rod hole 3 is opened on the housing 1. A push rod 4 is inserted into the push rod hole 3. One end of the push rod 4 is inserted into the housing 1 to control the opening and closing of the switch circuit 2, and the other end extends out of the housing 1 and is connected with a button 28. A first annular sealing groove 5 is opened on the inner wall of the push rod hole 3. A circumferentially extending second annular sealing groove 6 is opened on the outer wall of the end of the push rod 4 far away from the housing 1. A dust-proof sleeve 7 is sleeved on the push rod 4. The outer wall of one end of the dust-proof sleeve 7 radially protrudes outward to form a first sealing convex ring 8 that cooperates with the first annular sealing groove 5. The inner wall of the other end of the dust-proof sleeve 7 radially protrudes inward to form a second sealing convex ring 9 that tightly fits with the second annular sealing groove 6. A snap ring 10 is also clamped in the push rod hole 3. The snap ring 10 tightly presses the first sealing convex ring 8 in the first annular sealing groove 5. The dust-proof sleeve 7 is made of an elastic material, and its shape is similar to an expansion tube, which can realize axial expansion and contraction, so as to ensure that both ends of the dust-proof sleeve 7 can be stably sealed and connected with the push rod 4 and the housing 1.

[0024] As Figure 1As shown, the push rod hole 3 includes a guide section 301 and a clamping section 302. The diameter of the guide section 301 matches the outer diameter of the push rod 4 inserted therein, so that the push rod 4 can slide axially along the guide section 301 and limit the swing of the push rod 4. The guide section 301 is located at the inner end of the push rod hole 3, and the clamping section 302 is located at the outer end of the push rod hole 3. The inner diameter of the guide section 301 is smaller than the inner diameter of the clamping section 302. Therefore, there is an annular gap between the clamping section 302 and the push rod 4, which can be used to clamp the clamping ring 10. The first annular sealing groove 5 is arranged on the clamping section 302, and the clamping ring 10 is installed in the clamping section 302. One end of the dust cover 7 is clamped between the clamping ring 10 and the inner wall of the clamping section 302.

[0025] like Figure 1 and Figure 4 As shown, the housing 1 includes a base 101 and an upper cover 102 which are connected to each other, and the push rod holes 3 are evenly arranged on the same end surface of the base 101 and the upper cover 102, that is, a semicircular groove is respectively arranged on the base 101 and the upper cover 102. When the base 101 and the upper cover 102 are matched, the two semicircular grooves are connected to form a circular push rod hole 3, and the upper end of the base 101 is open toward one end of the upper cover 102, and a sealing groove 2 extending along the side wall of the base 101 is opened on the end surface of the open end 0, the sealing groove 20 extends all the way to the end surface of the guide section 301 of the push rod hole 3 facing the clamping section 302, a sealing strip 21 is embedded in the sealing groove 20, the end of the sealing strip 21 extends to the clamping section 302 of the push rod hole 3 and is tightly against the clamping ring 10, the lower end of the upper cover 102 is open to one end of the base 101, and a sealing convex strip 22 corresponding to the sealing groove 20 is provided on the lower end surface of the upper cover 102, the sealing convex strip 22 is inserted into the sealing groove 20 and squeezes the sealing strip 21.

[0026] like Figure 3 As shown, a cable arrangement groove 23 ( Figure 3 The upper cover 102 is in an inverted state), such as Figure 4 As shown, the base 101 is provided with an inserting plate 25 that cooperates with the cable groove 23 and can be inserted into the cable groove 23 to compress the cable 24. The inserting plate 25 is integrally formed with the side plate of the base 101 and extends upward from the upper edge of the side plate of the base 101. The sealing groove 20 extends to both sides of the inserting plate 25, and the sealing convex strip 22 extends to both sides of the cable groove 23. The cable groove 23 and the inserting plate 25 form a cable hole 26, and the cable 24 is crimped in the cable hole 26. One end of the cable 24 extends into the housing 1 and is connected to the switch circuit 2, and the other end is exposed outside the housing 1. The gap between the cable hole 26 and the cable 24 is filled with a sealant 27. The sealing groove 20 extends all the way to the cable hole 26, and the sealing strip 21 in the sealing groove 20 is sealed and bonded with the sealant 27 in the cable hole 26.

[0027] As shown Figures 1 to 4 in the figure, a reversing hole 11 communicating with the inside is also provided on the housing 1. A reversing rotating shaft 12 is rotatably inserted into the reversing hole 11. One end of the reversing rotating shaft 12 is inserted into the housing 1, and the other end extends out of the housing 1 and is connected with a handle 13. A connecting groove 14 coaxial with the reversing hole 11 is provided on the side of the handle 13 facing the reversing hole 11. A third annular sealing groove 15 is coaxially arranged around the connecting groove 14. The outer wall of the housing 1 at the periphery of the reversing hole 11 bulges axially outward along the reversing hole 11 to form an inner dust-proof ring 16 inserted into the connecting groove 14. An outer dust-proof ring 17 inserted into the third annular sealing groove 15 is coaxially arranged outside the inner dust-proof ring 16. The lower end of the outer dust-proof ring 17 is integrally formed with the outer wall of the housing 1. The third annular sealing groove 15, the outer dust-proof ring 17, the connecting groove 14 and the inner dust-proof ring 16 together form a labyrinth seal, and grease (not shown in the figure) is filled between the outer dust-proof ring 17 and the inner dust-proof ring 16.

[0028] As shown Figure 1 in the figure, the reversing rotating shaft 12 includes a small-diameter section 1201 matching with the reversing hole 11 and a large-diameter section 1202 located inside the housing 1. The large-diameter section 1202 and the small-diameter section 1201 are coaxial, the diameter of the large-diameter section 1202 is larger than that of the small-diameter section 1201, and an annular end face 1203 is formed at one end of the large-diameter section 1202 connected to the small-diameter section 1201. This annular end face 1203 faces the inner wall of the housing 1. A third sealing convex ring 18 coaxial with the small-diameter section 1201 is provided on this annular end face 1203. As shown Figure 3 in the figure, a fourth annular sealing groove 19 matching with the third sealing convex ring 18 is provided on the inner wall of the housing 1 opposite to the annular end face 1203. The third sealing convex ring 18 is inserted into the fourth annular sealing groove 19, and grease (not shown in the figure) is filled between the third sealing convex ring 18 and the small-diameter section 1201. The inner wall of the housing 1 between the fourth annular sealing groove 19 and the reversing hole 11 is inserted into the grease.

[0029] The working principle of the present invention is as follows: By sleeving a dust-proof sleeve 7 on the push rod 4, and sealing and abutting one end of the dust-proof sleeve 7 against the first annular sealing groove 5 in the push rod hole 3 by means of a snap ring 10, and sealing and connecting the other end of the dust-proof sleeve 7 to the push rod 4, the sealing isolation between the push rod hole 3 and the outside is realized, and the technical effect of dust-proof and waterproof for the switch is achieved.

[0030] The present invention further provides a clamping section 302 with a diameter larger than the guiding section 301 of the push rod hole 3 to provide a space for accommodating the dust-proof sleeve 7 and the snap ring 10, so that the thickness of the snap ring 10 can be increased, the pressing force of the snap ring 10 tightly abuting and squeezing the first sealing convex ring 8 of the dust-proof sleeve 7 can be strengthened, the sealing effect between the first sealing convex ring 8 and the first annular sealing groove 5 can be improved, and the dust-proof and waterproof effect of the switch can be improved.

[0031] The present invention further achieves the sealing isolation between the commutation hole 11 and the outside by providing a labyrinth seal between the dial handle 13 and the switch housing 1 and injecting grease into the labyrinth seal, further achieving the technical effect of dust and water protection for the switch.

[0032] The present invention further provides a third sealing convex ring 18 on the annular end face 1203 of the large-diameter section 1202 of the commutation rotating shaft 12, an annular fourth sealing groove 19 is provided on the inner wall of the housing 1 to cooperate with the third sealing convex ring 18, and grease is further injected between the third sealing convex ring 18 and the small-diameter section 1201, so that the inner wall of the housing 1 between the fourth annular sealing groove 19 and the commutation hole 11 is inserted into the grease, further ensuring the sealing isolation between the commutation hole 11 and the outside, and further improving the technical effect of dust and water protection for the switch.

[0033] The present invention further makes the base 101 and the upper cover 102 of the housing 1 be sealed and butted through the sealing strip 21, and the sealing strip 21 is embedded in the sealing groove 20 to improve the stability of the sealing strip 21, avoiding the sealing failure caused by the dislocation of the sealing strip 21. At the same time, the sealing convex strip 22 is inserted into the sealing groove 20 to extrude the sealing strip 21 to ensure the sealing effect of the sealing strip 21, and at the same time improve the butting accuracy between the base 101 and the upper cover 102, avoiding the sealing strip 21 from being aged when exposed to light, and prolonging the sealing effect and service life of the switch.

[0034] The present invention further achieves the sealing isolation between the wire arranging hole 26 and the outside by filling a sealing glue 27 in the gap between the wire arranging hole 26 and the wire 24, achieving the technical effect of dust and water protection for the switch.

[0035] The present invention further extends the end of the sealing strip 21 into the clamping section 302 and the wire arranging hole 26, so that the sealing strip 21 is tightly abutted against the snap ring 10 to achieve sealing, and the sealing strip 21 is bonded to the sealing glue 27 to achieve sealing, finally achieving the sealing goal of the butting seam between the base 101 and the upper cover 102 at the push rod hole 3 and the wire arranging hole 26.

[0036] The above embodiments are only illustrative of the principles and effects of the present invention and some applied embodiments, rather than limiting the present invention; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An electric tool switch with strong waterproof and dustproof performance, comprising a housing (1), a switch circuit (2) is arranged inside the housing (1), a push rod hole (3) is opened on the housing (1), a push rod (4) is inserted into the push rod hole (3), one end of the push rod (4) is inserted into the housing (1) to control the opening and closing of the switch circuit (2), and the other end of the push rod (4) extends out of the housing (1), characterized in that, On the inner wall of the push rod hole (3), a first annular sealing groove (5) is provided. On the outer wall of the end of the push rod (4) away from the housing (1), a circumferentially extending second annular sealing groove (6) is provided. A dust-proof sleeve (7) is sleeved on the push rod (4). The outer wall of one end of the dust-proof sleeve (7) radially protrudes outward to form a first sealing convex ring (8) that cooperates with the first annular sealing groove (5). The inner wall of the other end of the dust-proof sleeve (7) radially protrudes inward to form a second sealing convex ring (9) that is in tight fit with the second annular sealing groove (6). A snap ring (10) is also clamped in the push rod hole (3), and the snap ring (10) tightly presses the first sealing convex ring (8) in the first annular sealing groove (5); On the housing (1), a reversing hole (11) communicating with its interior is also provided. A reversing rotating shaft (12) is rotatably inserted into the reversing hole (11). One end of the reversing rotating shaft (12) is inserted into the housing (1), and the other end of the reversing rotating shaft (12) extends out of the housing (1) and is connected with a handle (13). On the side of the handle (13) facing the reversing hole (11), a connecting groove (14) coaxial with the reversing hole (11) is provided. A third annular sealing groove (15) is coaxially arranged around the connecting groove (14). The outer wall of the housing (1) at the four peripheral edges of the reversing hole (11) axially protrudes outward to form an inner dust-proof ring (16) inserted into the connecting groove (14). An outer dust-proof ring (17) inserted into the third annular sealing groove (15) is coaxially arranged outside the inner dust-proof ring (16). The lower end of the outer dust-proof ring (17) is fixedly and sealedly connected to the outer wall of the housing (1). The third annular sealing groove (15), the outer dust-proof ring (17), the connecting groove (14) and the inner dust-proof ring (16) together form a labyrinth seal, and grease is filled between the outer dust-proof ring (17) and the inner dust-proof ring (16).

2. The switch according to claim 1, wherein The push rod hole (3) includes a guiding section (301) and a clamping section (302). The guiding section (301) is located at the inner end of the push rod hole (3), and the clamping section (302) is located at the outer end of the push rod hole (3). The inner diameter of the guiding section (301) is smaller than the inner diameter of the clamping section (302). The first annular sealing groove (5) is arranged on the clamping section (302), and the snap ring (10) is installed in the clamping section (302).

3. The switch according to claim 1, characterized in that, The commutation rotating shaft (12) includes a small-diameter section (1201) that fits with the commutation hole (11) and a large-diameter section (1202) located inside the housing (1). The large-diameter section (1202) and the small-diameter section (1201) are coaxial. The diameter of the large-diameter section (1202) is greater than that of the small-diameter section (1201). One end of the large-diameter section (1202) connected to the small-diameter section (1201) forms an annular end face (1203). This annular end face (1203) faces the inner wall of the housing (1). A third sealing convex ring (18) coaxial with the small-diameter section (1201) is provided on this annular end face (1203). A fourth annular sealing groove (19) that cooperates with the third sealing convex ring (18) is provided on the inner wall of the housing (1) facing the annular end face (1203). The third sealing convex ring (18) is inserted into the fourth annular sealing groove (19). Grease is filled between the third sealing convex ring (18) and the small-diameter section (1201). The inner wall of the housing (1) between the fourth annular sealing groove (19) and the commutation hole (11) is inserted into the grease.

4. The switch according to claim 2, characterized in that, The housing (1) includes a base (101) and an upper cover (102) that are connected by being opposed to each other. The push rod holes (3) are evenly distributed on the same end face of the base (101) and the upper cover (102). The upper end of the base (101) is open, and a sealing groove (20) extending along the side wall of the base (101) is provided on the opening end face of the base (101). The sealing groove (20) extends all the way to the end face of the guiding section (301) of the push rod hole (3) facing the clamping section (302). A sealing rubber strip (21) is embedded in the sealing groove (20). The end of the sealing rubber strip (21) extends into the clamping section (302) of the push rod hole (3) and abuts tightly against the snap ring (10). The lower end of the upper cover (102) is open, and a sealing convex strip (22) corresponding to the sealing groove (20) is provided on the lower end face of the upper cover (102). The sealing convex strip (22) is inserted into the sealing groove (20) and presses the sealing rubber strip (21).

5. The switch according to claim 4, wherein On one side plate of the upper cover (102) facing away from the push rod hole (3), a wire discharge groove (23) extending upward from the lower edge is provided. On the base (101), there is an insertion plate (25) that cooperates with the wire discharge groove (23) and can be inserted into the wire discharge groove (23) to press the wire harness (24). The insertion plate (25) is integrally formed with the side plate of the base (101) and extends upward from the upper edge of the side plate of the base (101). The sealing groove (20) extends to both side surfaces of the insertion plate (25). The sealing rib (22) extends to both side surfaces of the wire discharge groove (23). The wire discharge groove (23) and the insertion plate (25) form a wire harness hole (26). A wire harness (24) is crimped in the wire harness hole (26). One end of the wire harness (24) extends into the housing (1) and is connected to the switch circuit (2), and the other end of the wire harness (24) is exposed outside the housing (1). The gap between the wire harness hole (26) and the wire harness (24) is filled with a sealant (27). The sealing groove (20) extends all the way to the wire harness hole (26), and the sealing strip (21) in the sealing groove (20) is hermetically bonded to the sealant (27) in the wire harness hole (26).

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