A protection switch

Abstract

The present invention discloses a protective switch, comprising a body, a static contact, a moving contact and a handle, wherein the static contact and the moving contact are respectively arranged on the body, and the handle is rotatably arranged on the body; a cam portion is arranged on the handle, and the cam portion contacts and cooperates with the moving contact, and when the handle rotates, the cam portion is used to cause the moving contact to move to realize opening or closing. The handle of the present invention is provided with a cam portion, which directly contacts and cooperates with the moving contact, greatly simplifies the transmission relationship between the handle and the moving contact, saves parts, makes the product cost lower, simplifies assembly, saves space, and is conducive to realizing miniaturization of the product.

Description

Technical Field

[0001] The invention relates to a switch device, in particular to a protection switch. Background Art

[0002] At present, the operating mechanism of the protection switch in the prior art generally includes a handle, a shaft, a U-shaped rod, a pressure block, a linkage pressure plate, a bracket, a spring and a moving touch plate. The bracket is fixed to the base of the protection switch by screws, and the handle is hinged to the bracket by a shaft. The handle rotates through the U-shaped rod and the pressure block to drive the linkage pressure plate to press the moving touch plate down, thereby realizing the opening and closing of the protection switch. Obviously, the operating mechanism of the protection switch in the prior art requires many parts, high cost, complex assembly, and large space occupation, which is not conducive to realizing product miniaturization. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a protection switch which saves parts and simplifies the transmission relationship.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a protective switch, including a main body, a static contact, a moving contact and a handle, the static contact and the moving contact are respectively arranged on the main body, and the handle is rotatably arranged on the main body; a cam portion is provided on the handle, and the cam portion contacts and cooperates with the moving contact. When the handle rotates, the cam portion causes the moving contact to move to realize opening or closing of the switch.

[0005] Furthermore, in both the opening and closing states, the cam portion of the handle forms surface contact with the moving contact.

[0006] Furthermore, the main body includes a base and an upper cover, the static contact and the dynamic contact are respectively arranged on the base, and a reset elastic member is arranged between the dynamic contact and the base or the upper cover; the handle is rotatably arranged on the base, the upper cover is arranged on the base, and the upper cover is provided with an accommodation hole for the handle to move partially through.

[0007] Furthermore, the handle is provided with a rotating shaft and a barb located at the lower side of the rotating shaft, the base is provided with a receiving groove and a hook located at the lower side of the receiving groove, the rotating shaft of the handle is movably engaged in the receiving groove of the base, and in the closed state, the barb and the hook are hung together to limit the upward movement of the handle.

[0008] Furthermore, the handle is provided with an outwardly convex arc wall, and the two opposite inner end edges of the accommodation hole of the upper cover are respectively arc-shaped and matched with the arc wall of the handle.

[0009] Furthermore, a moving contact is provided at one end of the moving contact, which cooperates with the static contact provided on the static contact; the other end of the moving contact is movably provided on the base up and down, and the upper cover extends downward with a limiting portion to limit the upward movement distance of the other end of the moving contact in the open state.

[0010] Furthermore, the resetting elastic member is a spring, and the spring is disposed between the bottom surface of the moving contact member and the base.

[0011] Furthermore, the upper cover is snap-connected to the base.

[0012] Furthermore, it also includes an outer cover, which is arranged on the base and has an opening for exposing the upper cover in whole or in part.

[0013] Furthermore, the number of the static contacts and the number of the dynamic contacts are at least two respectively, and they cooperate one by one; the number of the handle is one, and the handle is provided with at least two cam parts distributed in parallel, and each cam part contacts and cooperates with each dynamic contact one by one.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The handle of the present invention is provided with a cam portion, which directly contacts and cooperates with the moving contact, greatly simplifying the transmission relationship between the handle and the moving contact, saving parts, making the product cost lower, easier to assemble, saving space, and facilitating the miniaturization of the product.

[0016] 2. In the open and closed states, the cam part of the handle forms surface contact with the moving contact, which can reduce the pressure per unit area of ​​the handle, thereby helping to increase the service life of the protection switch.

[0017] 3. The coordinated design of the rotating shaft and barb on the handle and the receiving groove and hook on the base makes the assembly of the handle very simple and reliable.

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, a protection switch of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded schematic diagram of the present invention in Example 1;

[0020] Figure 2 is a schematic structural diagram of a moving contact member of the present invention in Embodiment 1;

[0021] Figure 3 The structure of the handle of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 4 The structure of the handle of the present invention is shown in FIG. Figure 2 ;

[0023] Figure 5 is a cross-sectional view of the first embodiment of the present invention in the open state;

[0024] Figure 6 is a cross-sectional view of the present invention in the first embodiment in a closed state;

[0025] Figure 7 1 is a schematic diagram (cross-sectional view) of the assembly of the handle and the base in the closed state of the present invention according to the first embodiment;

[0026] Figure 8 Embodiment 1 Figure 7 A magnified schematic diagram of part A;

[0027] Fig. 9 is a cross-sectional view of the stationary contact and the base of the present invention in an assembled state;

[0028] Fig.10 is a schematic structural diagram of a stationary contact of the present invention;

[0029] Fig.11 is a structural schematic diagram of a movable contact member of the present invention in Embodiment 2;

[0030] Fig.12 is a cross-sectional view of the second embodiment of the present invention in a closed state;

[0031] Fig.13 It is a cross-sectional view of the second embodiment of the present invention in the open state. DETAILED DESCRIPTION

[0032] Embodiment 1

[0033] See also Figure 1-Figure 10 As shown, a protective switch of the present invention includes a body, a static contact 6, a moving contact 5, a reset elastic member and a handle 4. The static contact 6 (also called a static contact piece or a static contact plate) and the moving contact 5 (also called a moving contact piece or a moving contact plate) are respectively arranged on the body. A reset elastic member is arranged between the moving contact 5 and the body to provide a reset force for the handle 4 and the moving contact 5. In addition, the moving contact 5 can also be made of elastic material so that it has a reset capability, so there is no need to arrange the reset elastic member. The handle 4 is rotatably arranged on the body. A cam portion 41 is arranged at one end of the handle 4. The cam portion 41 contacts and cooperates with the moving contact 5. When the handle rotates, the cam portion thereof causes the moving contact to move to realize opening or closing.

[0034] In this embodiment, the movable contact member 5 is provided with an arched portion 51, and the top surface of the arched portion 51 has a first slope 511 and a second slope 512 at two opposite sides of the top corner thereof, respectively. The first slope 511 and the second slope 512 are inclined surfaces, and the slope (also called inclination) of the first slope 511 is greater than the slope of the second slope 512. In the open state, the cam portion 41 of the handle contacts the first slope 511 of the arched portion 51, and in the closed state, the cam portion 41 of the handle contacts the second slope 512 of the arched portion 51.

[0035] In this embodiment, in the open and closed states, the cam portion 41 of the handle 4 forms surface contact with the first slope 511 and the second slope 512 respectively. Specifically, the cam portion 41 of the handle 4 is provided with a first mating surface 411 for contacting the first slope 511 and a second mating surface 412 for contacting the second slope 512, the distance between the first mating surface 411 and the rotation axis of the handle 4 is smaller than the distance between the second mating surface 412 and the rotation axis of the handle 4, and the first mating surface 411 and the second mating surface 412 are transitioned by an outward convex arc surface. The first slope 511 and the second slope 512 are transitioned by an upward convex arc surface, that is, the surface of the top corner of the arched portion 51 is an upward convex arc surface.

[0036] In this embodiment, the body includes a base 1 and an upper cover 2, the static contact 6 and the dynamic contact 5 are respectively arranged on the base 1, and the reset elastic member is arranged between the dynamic contact 5 and the base 1. The handle 4 is rotatably arranged on the base 1, and the upper cover 2 is arranged on the base 1. Specifically, the upper cover 2 is snap-connected with the base 1, and the upper cover 2 is provided with an allowance hole 21 for the other end of the handle 4 to pass through and realize rotation. Specifically, the handle 4 is provided with a rotating shaft 42 and a barb 43 located at the lower side of the rotating shaft 42, and the base 1 is provided with a receiving groove 12 and a hook 13 located at the lower side of the receiving groove 12. The rotating shaft 42 of the handle 4 is movably matched in the receiving groove 12 of the base 1. In the closed state, the barb 43 and the hook 13 are hung together to limit the upward movement of the handle 4.

[0037] In this embodiment, a moving contact 52 is provided at one end of the moving contact 5, and the moving contact 52 corresponds to the static contact 63 provided on the static contact 6. The other end of the moving contact 5 is connected to the wiring terminal, and is movably provided on the base 1. Specifically, convex portions 53 extend from opposite sides of the other end of the moving contact 52, and the base 1 is provided with guide grooves 11 that match the two convex portions 53 of the moving contact 52 one by one. The convex portions 53 are limited in the guide grooves 11 and can move up and down along the guide grooves 11. The arched portion 51 is located between the two ends of the moving contact 5. The bottom surface of the part between the arched portion 51 and the other end of the moving contact 5 is provided with the reset elastic member between the base 1, and the bottom surface of the part between the arched portion 51 and the other end of the moving contact 5 is provided with a positioning convex particle 54 for positioning the reset elastic member. The reset elastic member is specifically a spring 7. The upper cover 2 has a limit portion 22 extending downwardly to limit the upward movement distance of the other end of the moving contact 5 in the open state.

[0038] In this embodiment, the number of the static contacts 6 and the number of the dynamic contacts 5 are two, but not limited to this. The two static contacts 6 cooperate with the two dynamic contacts 5 one by one. The number of the handle 4 is one, and one end of the handle 4 is provided with two cam portions 41 distributed in parallel, and the two cam portions 41 contact and cooperate with the arched portions 51 of the two dynamic contacts 5 one by one. The rotating shaft 42 and the barb 43 on the handle 4 are located between the two cam portions 41. The handle 4 also has an outwardly convex arc wall 44 on the upper side of the rotating shaft 42, and the part 45 of the handle 4 extending out of the upper cover 2 is connected to the outer surface of the arc wall 44. The two opposite inner end edges of the accommodation hole 21 of the upper cover 2 are respectively arc-shaped to cooperate with the arc wall 44 of the handle 4, which can not only limit the handle 4 from slipping out, but also guide the rotation of the handle 4.

[0039] In this embodiment, Fig. 9 , Fig.10 As shown, the static contact 6 is specifically arranged on the base 1 through a wiring assembly, and the wiring assembly includes a wiring frame 8 and a wiring screw 9 screwed on the wiring frame 8, and the wiring frame 8 is provided with a wiring hole 81. The base 1 is provided with a first mounting groove 14 and a first opening 17 leading to the first mounting groove 14 and used to screw the wiring screw 9; the wiring assembly is placed in the first mounting groove 14, the head of the wiring screw 9 is aligned with the first opening 17, and the wiring screw 9 is restricted from withdrawing from the first opening 17; the wiring portion 61 of the static contact 6 extends into the wiring hole 81 of the wiring frame 8, and the tail of the wiring screw 9 is pressed against the connection portion of the wire (not shown in the figure), and the connection portion of the wire is located in the wiring hole 81. In this way, it is convenient to install the wiring assembly and screw the wiring screw, and prevent the wiring screw from withdrawing from the first opening, ensuring that the wiring screw will not fall off when it is loosened, thereby avoiding the loss of the wiring screw, which is beneficial to the user's maintenance and use of the static contact and wiring assembly of the protection switch.

[0040] In this embodiment, the base 1 is further provided with a second opening 18 opposite to the first opening 17, and the wiring assembly is placed in the first installation groove 14 from the second opening 18. A stop structure is provided between the wiring screw 9 and the first installation groove 14 to prevent the wiring screw 9 from withdrawing from the first opening 17. Specifically, the stop structure includes an outer flange 91 provided on the outer periphery of the head of the wiring screw 9 and a clamping platform 141 provided on the inner wall of the first installation groove 14 near the first opening 17, and the outer flange 91 is fitted inside the clamping platform 141, and the two can touch each other.

[0041] In this embodiment, the connecting portion of the wire extends into the wiring hole 81 from one end of the wiring hole 81 (one end of the wiring hole 81 is at the bottom), and the connecting portion 61 of the static contact 6 extends into the wiring hole 81 from the other end of the wiring hole 81 (the other end of the wiring hole 81 is at the top). The base 1 is provided with a retaining wall 16 at a position corresponding to the other end of the wiring hole 81 to prevent the connecting portion of the wire from extending out of the first mounting groove 14 and effectively control the length of the wire extending into the wiring hole 81, thereby preventing the wire from contacting the moving contact 5 of the protection switch without adding additional parts. The bottom end of the base 1 is provided with a wire passing opening 19 leading to the first mounting groove 14 and corresponding to one end of the wiring hole 81, and the wire passing opening 19 is used for the connecting portion of the wire to pass through.

[0042] In this embodiment, the base 1 is further provided with a second mounting groove 15, which is located on the upper side of the first mounting groove 14 and leads to the first mounting groove 14, and the static contact 6 is provided in the second mounting groove 15. Specifically, the static contact 6 and the second mounting groove 15 are matched with a positioning structure, and the positioning structure includes a barb 641 provided on the static contact 6, and the barb 641 is stuck in the groove wall of the second mounting groove 15. The structure of the static contact 6 is as follows Fig.10 As shown, in addition to the wiring portion 61, it also includes a main body 62 provided with a static contact 63, the main body 62 and the wiring portion 61 are integrally connected to form an L shape, and positioning pieces 64 are respectively extended downward on the opposite sides of the main body 62, and the barbs 641 are respectively provided on each positioning piece 64. Specifically, the barbs 641 are respectively provided on the opposite outer sides of each positioning piece 64. During installation, each positioning piece 64 of the static contact 6 extends into the second installation groove 15, and the barbs 641 thereon are stuck on the groove wall of the second installation groove 15, thereby preventing the static contact 6 from falling off.

[0043] In this embodiment, the connection part 61 of the static contact 6 is provided with an anti-slip structure that can be engaged with the side of the wire that matches it, and the anti-slip structure is specifically a convex rib 611. Since the wire is soft, when the connection part 61 of the static contact 6 is pressed against the connection part of the wire by the tail of the connection screw 8, the side of the connection part of the wire that contacts the connection part 61 will be pressed out by the convex rib 611 to form a groove that matches it, and the two are engaged together, so that the connection part 61 of the static contact 6 and the connection part of the wire are more firmly connected, and the connection part of the wire is prevented from loosening due to internal stress or external tension. In addition, the design of the convex rib 611 can also increase the contact area between the connection part of the static contact 6 and the wire, thereby reducing the contact resistance between the two and reducing the current-carrying temperature rise. A number of concave stripes 612 are distributed on the connection surface of the connection part 61 of the static contact 6, which is conducive to reducing the contact resistance between the static contact 6 and the wire. If the stripes are set to be convex, it is also conducive to increasing the friction between the connection part 61 of the static contact 6 and the connection part of the wire.

[0044] In this embodiment, the present invention further comprises an outer cover 3 , which is disposed on the base 1 and has an opening 31 for partially exposing the upper cover 2 .

[0045] When assembling the handle 4, first place the handle 4 in the closing position. Under the action of the spring 7, the moving contact 5 will push the rotating shaft 42 of the handle 4 to move upward along the accommodating groove 12 of the base 1. At this time, the barb 43 of the handle 4 will be stuck at the hook 13 of the base 1 to prevent the handle 4 from moving upward, thereby making the switch assembly convenient and reliable.

[0046] When the protection switch is in the open state, Figure 5 As shown, the first matching surface 411 of the cam portion 41 and the first slope surface 511 of the moving contact 5 are in surface contact, and when the protection switch is in the closed state, as shown in FIG. Figure 6 As shown, the second matching surface 412 of the cam portion 41 and the second slope 512 of the movable contact 5 are in surface contact, so that the pressure on the unit area of ​​the handle 4 is reduced, which is beneficial to improving the service life of the protection switch. The first slope 511 of the movable contact 5 has a larger slope in order to make the closing speed of the movable contact 5 faster at the same handle movement speed, thereby realizing the rapid closing of the switch, while the second slope 512 of the movable contact 5 has a smaller slope, which cooperates with the cam portion 41 of the handle, so that when the cam portion 41 of the handle moves along the second slope 512 of the movable contact, the movement amount of the movable contact 5 can be reduced, thereby ensuring the stability of the switch.

[0047] When working, the above two states of the protection switch can be switched by operating the handle 4. Figure 5 In the open state shown in the figure, the handle 4 is rotated counterclockwise, so that the cam portion 41 rotates counterclockwise and acts on the arched portion 51 of the moving contact 5, thereby pushing the moving contact 5 downward and compressing the spring 7, so that the moving contact 52 of the moving contact 5 contacts the static contact 63 of the static contact 6, and the protection switch is closed. In this process, the cam portion 41 passes over the top of the arched portion 51 and finally reaches the second slope 512 of the arched portion 51, and the second matching surface 412 of the cam portion contacts the second slope 512. When the protection switch is in the closed state, the cam portion 41 passes over the top of the arched portion 51 and finally reaches the second slope 512 of the arched portion 51, and the second matching surface 412 of the cam portion contacts the second slope 512. Figure 6In the closed state shown, the handle 4 is rotated clockwise, and the cam portion 41 of the handle rotates clockwise and cancels the downward force on the moving contact 5. At the same time, the moving contact 5 moves upward under the restoring force of the spring 7, so that the moving contact 52 is separated from the static contact 63 of the static contact 6, and the protection switch is opened. In this process, the cam portion 41 passes over the top of the arched portion 51 and finally reaches the first slope 511 of the arched portion 51, and the first matching surface 411 of the cam portion touches the first slope 511. The design of the arched portion 51 on the moving contact 5 can effectively shorten the matching stroke between the cam portion 41 of the handle 4 and the moving contact 5, thereby reducing the requirements for the internal space size of the protection switch, so that the size of the protection switch can be made smaller, and the miniaturization of the product is truly realized.

[0048] Embodiment 2

[0049] See also Figure 11-13 As shown, a protection switch of the present invention is different from the first embodiment in that the portion where the movable contact 5 contacts and cooperates with the cam portion of the handle is not designed with the arched portion, but is in a flat plate shape.

[0050] When working, just turn the handle 4 to make the cam portion 41 directly act on the moving contact 5, thereby switching the opening and closing states of the protection switch. Specifically, when the handle is turned counterclockwise, the cam portion 41 of the handle rotates counterclockwise and pushes the moving contact 5 to move downward, and compresses the spring 7, so that the moving contact 52 of the moving contact 5 contacts the static contact 63 of the static contact 6, as shown in FIG. Fig.12 When the handle is turned clockwise, the cam portion 41 of the handle rotates clockwise and cancels the downward force on the moving contact 5. At the same time, the moving contact 5 moves upward under the restoring force of the spring 7, so that the moving contact 52 of the moving contact 5 is separated from the static contact 63 of the static contact 6. Fig.13 As shown, the protection switch is opened.

[0051] Compared with the first embodiment, the matching stroke between the handle and the movable contact member in this embodiment is longer. Therefore, from the perspective of miniaturization of the product, the first embodiment is a preferred embodiment of the present invention.

[0052] In other embodiments, both the first slope surface and the second slope surface are arc surfaces with a preset slope, and are preferably convex arc surfaces.

[0053] The above embodiments are only used to further illustrate a protection switch of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A protection switch, comprising a body, a static contact, a moving contact and a handle, wherein the static contact and the moving contact are respectively arranged on the body, and the handle is rotatably arranged on the body; characterized in that: The handle is provided with a cam portion, which contacts and cooperates with the moving contact. When the handle is rotated, the cam portion causes the moving contact to move to achieve opening or closing of the switch; the main body includes a base, and the handle is rotatably set on the base. The handle is provided with a barb, and the base is provided with a hook. In the closed state, the barb and the hook are hung together to limit the upward movement of the handle.

2. The protection switch according to claim 1, characterized in that: In the open and closed states, the cam portion of the handle forms surface contact with the moving contact.

3. The protection switch according to claim 1, characterized in that: The main body also includes an upper cover, the static contact and the dynamic contact are respectively arranged on the base, and a reset elastic member is arranged between the dynamic contact and the base or the upper cover; the upper cover is arranged on the base, and an accommodation hole is provided on the upper cover for the partial movement of the handle to pass through.

4. The protection switch according to claim 3, characterized in that: The handle is provided with a rotating shaft and the barb located at the lower side of the rotating shaft, the base is provided with a receiving groove and the hook located at the lower side of the receiving groove, and the rotating shaft of the handle is movably matched in the receiving groove of the base.

5. The protection switch according to claim 3 or 4, characterized in that: The handle is also provided with an outwardly convex arc wall, and the two opposite inner end edges of the accommodation hole of the upper cover are respectively arc-shaped and matched with the arc wall of the handle.

6. The protection switch according to claim 3, characterized in that: A moving contact is provided at one end of the moving contact, which cooperates with the static contact provided on the static contact; the other end of the moving contact is movably provided on the base, and the upper cover extends downward to form a limiting portion for limiting the upward movement distance of the other end of the moving contact in the open state.

7. The protection switch according to claim 6, characterized in that: The resetting elastic member is a spring, which is arranged between the bottom surface of the moving contact member and the base.

8. The protection switch according to claim 3, characterized in that: The upper cover is snap-connected to the base.

9. The protection switch according to claim 3, characterized in that: The utility model also comprises an outer cover which is arranged on the base and has an opening for exposing the upper cover completely or partially.

10. The protection switch according to claim 1, characterized in that: The number of the static contacts and the number of the dynamic contacts are at least two, and they cooperate one by one; the number of the handle is one, and the handle is provided with at least two cam parts distributed in parallel, and each cam part contacts and cooperates with each dynamic contact one by one.

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