Signal switch device for electric tool

Abstract

The utility model relates to the technical field of electric tools, in particular to a signal switch device for an electric tool, which comprises a shell, a PCB (printed circuit board) is arranged in the shell, a conducting signal area and a reversing signal area are arranged on the PCB, a flat cable is further arranged on the PCB, and the flat cable is used for being electrically connected with a brushless motor to transmit switch signals. A conduction switch structure electrically connected with the corresponding conduction signal area and a reversing switch structure electrically connected with the corresponding reversing signal area are arranged in the shell. The conduction switch structure comprises a push rod, a first spring, a movable contact piece and a sealing sleeve. The reversing switch structure comprises a shifting handle and a first reed; the design that the corrugated sealing sleeve is matched with the first groove can form sealing between the conduction switch structure and the shell, the design that the second protruding part is matched with the second groove and viscous grease can form sealing between the reversing switch structure and the shell, the overall waterproof and dustproof effect of the product is improved, and the use requirement of the product in the complex environment is met; and market popularization and application are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of power tools, and particularly relates to a signal switch device for a power tool. Background Art

[0002] At present, brushless DC signal switches are widely used in various power tools, such as portable hand-held power tools, etc. The signal switch includes a conduction switch structure and a commutation switch structure.

[0003] Since the switch structure needs to perform moving actions, good sealing cannot be achieved at the position of the switch structure. The overall waterproof and dustproof effect of the signal switch is not good, and it cannot be used in a dusty environment or a complex environment such as high humidity. Summary of the Utility Model

[0004] In view of the above-mentioned deficiencies of the prior art, the purpose of the present utility model is to provide a signal switch device for a power tool, which is used to solve the problem of poor waterproof and dustproof effects of the signal switch adopted in the prior art.

[0005] To achieve the above purpose and other related purposes, the present utility model provides a signal switch device for a power tool, including a housing. A PCB board is arranged in the housing. A conduction signal area and a commutation signal area are arranged on the PCB board. A wiring harness is also arranged on the PCB board, and the wiring harness is used for electrically connecting a brushless motor to transmit switch signals;

[0006] A conduction switch structure electrically connected to the conduction signal area and a commutation switch structure electrically connected to the commutation signal area are arranged in the housing;

[0007] The conduction switch structure includes: a push rod. One end of the push rod is provided with a first spring, and the other end of the first spring is connected to the inner wall of the housing; the other end of the push rod extends out of the housing in a telescopic manner;

[0008] A moving contact piece is arranged on the side end of the rod body of the push rod inside the housing, and the moving contact piece can be separated and press against the conduction signal area of the PCB board;

[0009] The commutation switch structure includes: a dial handle. One end of the dial handle is provided with a first reed, and the first reed can move and press against the commutation signal area of the PCB board; the other end of the dial handle extends out of the housing in a rotatable manner;

[0010] A sealing sleeve is sleeved on the push rod. One end of the sealing sleeve is provided with a first convex part, and a first groove is arranged in the area of the housing for connecting the push rod. The first convex part is clamped into the first groove; the other end of the sealing sleeve is closely attached to the outer end of the push rod;

[0011] The handle is provided with a second convex portion, and the area of the shell used to connect the handle is provided with a second groove, the second groove is coated with viscous grease, and the second convex portion is matched in the second groove to form a waterproof layer between the two through the viscous grease.

[0012] In one embodiment of the present invention, a metal terminal is provided on the conductive signal area of the PCB board, and the movable contact piece and the metal terminal form a seesaw-type detachable contact fit.

[0013] In an embodiment of the present invention, a tension spring is provided between the movable contact piece and the PCB board.

[0014] In one embodiment of the present invention, a pin is provided in a region of the housing corresponding to the push rod, and the other end of the first spring is sleeved on the outside of the pin.

[0015] In an embodiment of the present invention, a button is disposed at one end of the push rod outside the housing.

[0016] In an embodiment of the present invention, the sealing sleeve adopts a corrugated stretchable structure.

[0017] In an embodiment of the present invention, a resistance signal area is provided on the PCB board, a second reed is plugged into the push rod, and the second reed is in contact with the resistance signal area.

[0018] In one embodiment of the utility model, the end of the first reed sheet of the handle is provided with a through groove and a transverse groove, a second spring is provided in the through groove, and a steel ball is provided on the second spring; the area of the shell corresponding to the handle is provided with a baffle, a wavy notch is provided on the baffle, and one end of the baffle with the wavy notch is inserted into the transverse groove, and the steel ball movably contacts the wavy notch.

[0019] In an embodiment of the present invention, glue is applied between the connecting end of the flat cable and the housing.

[0020] As described above, the signal switch device for electric tools of the utility model has the following beneficial effects:

[0021] 1. By providing a corrugated sealing sleeve with a first convex portion, and providing a first groove on the outer shell, the first convex portion cooperates with the first groove to form a seal between the push rod and the outer shell, thereby improving the waterproof and dustproof effect of the product, and the retractable corrugated sealing sleeve does not affect the pushing and resetting activities of the push rod; by providing a second convex portion on the dial handle, and providing a second groove on the outer shell and applying viscous grease, the second convex portion cooperates with the second groove to extend the contact surface of the dial handle relative to the outer shell, and the viscous grease can form a sealed waterproof and dustproof seal between the dial handle and the outer shell without affecting the normal range of the dial handle, thereby further improving the waterproof and dustproof effect of the product;

[0022] 2. By setting up a seesaw mechanical structure composed of a moving contact piece and a metal terminal, the conduction switch is relatively stable, the contact wear is small, and the switch is turned on and off by simply toggling up and down. The operation method is very intuitive and easy to understand, and can provide reliable service for a long time; and the seesaw switch structure usually has a compact design, which can effectively save space and make the product more compact;

[0023] 3. The signal switch device for electric tools provided by the utility model has a reasonable design and a compact structure. The corrugated sealing sleeve cooperates with the design of the first groove to form a seal between the conduction switch structure and the housing. The second convex portion cooperates with the design of the second groove and the viscous grease to form a seal between the reversing switch structure and the housing, thereby improving the overall waterproof and dustproof effect of the product, meeting the use requirements of the product in complex environments, and facilitating market promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic diagram of the appearance of the utility model.

[0025] Figure 2 Shown is a schematic diagram of the exploded structure of the utility model.

[0026] Figure 3 The figure shows the exploded structure of the utility model without the housing and buttons.

[0027] Figure 4 Display as Figure 3 A magnified diagram of the exploded structure of the mid-conduction switch structure and the PCB board.

[0028] Figure 5 Display as Figure 3 A magnified diagram of the exploded structure of the middle reversing switch structure and the PCB board.

[0029] Figure 6 Shown is a cross-sectional structural schematic diagram of the present utility model.

[0030] Figure 7 Display as Figure 6 Enlarged view of point A in the middle.

[0031] Figure 8 Display as Figure 6 Enlarged view of point B in the middle.

[0032] Figure 9 Display as Figure 6 Enlarged view of point C in the middle.

[0033] Component number description

[0034] Housing 1; first groove 11; second groove 12; PCB board 2; conduction signal area 21; commutation signal area 22; resistance signal area 23; wire harness 3; conduction switch structure 4; push rod 41; first spring 42; moving contact 43; sealing sleeve 44; first protrusion 441; second reed 45; commutation switch structure 5; handle 51; second protrusion 511; through slot 512; transverse slot 513; first reed 52; second spring 53; steel ball 54; viscous grease 6; metal terminal 7; pin 8; button 9; glue 10; retaining piece 13; wavy notch 131; tension spring 14; metal support 15. Detailed implementation mode

[0035] The following specific embodiments illustrate the implementation mode of the present invention. Those familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0036] Please refer to Figures 1 to 9 Note that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0037] Please refer to Figures 1 - 9 , the present invention provides a signal switch device for a power tool, including a housing 1. A PCB board 2 is provided in the housing 1. A conduction signal area 21, a commutation signal area 22, and a resistance signal area 23 are provided on the PCB board 2. A wire harness 3 is also provided on the PCB board 2. Glue 10 is dot-applied between the outgoing end of the wire harness 3 and the housing 1 to form a sealing layer; the wire harness 3 is used for electrically connecting a brushless motor to transmit switch signals.

[0038] A conduction switch structure 4 corresponding to the conduction signal area 21 and a commutation switch structure 5 corresponding to the commutation signal area 22 are provided in the housing 1 for electrical connection.

[0039] Please refer to Figures 3 - 4, 6-7, the conduction switch structure 4 includes: a push rod 41, one end of which is provided with a first spring 42, and the other end of the first spring 42 is connected to the inner wall of the shell 1. Specifically, a pin 8 is provided on the inner wall of the shell 1, and the other end of the first spring 42 is sleeved on the outer side of the pin 8. The pin 8 can limit the pushing distance of the push rod 41 to prevent excessive pushing from damaging the push rod 41; the other end of the push rod 41 can be telescopically extended to the outside of the shell 1 and a button 9 is installed on the outer end; the push rod 41 is provided with a moving contact piece 43 at the side end of the rod body located inside the shell 1, and the push rod 41 is pushed by the button 9 to move and drive the moving contact piece 43 to detachably press the conduction signal area 21 of the PCB board 2 to realize the switch function of the electric tool; a second reed 45 is inserted into the push rod 41, and the second reed 45 is in contact with the resistance signal area 23. Pushing the push rod 41 can simultaneously drive the second reed 45 to move to the contact position relative to the resistance signal area 23 to achieve the purpose of adjusting the resistance, thereby realizing the function of adjusting the running speed of the electric tool. The push rod 41 is sleeved with a sealing sleeve 44, which adopts a corrugated stretchable structure; one end of the sealing sleeve 44 is provided with a first convex portion 441, and the area of the outer shell 1 used to connect the push rod 41 is provided with a first groove 11, and the first convex portion 441 is inserted into the first groove 11, so as to form a seal between the push rod 41 and the outer shell 1, thereby improving the waterproof and dustproof effect of the product, and the retractable corrugated sealing sleeve 44 does not affect the pushing and resetting activities of the push rod 41; the other end of the sealing sleeve 44 is tightly fitted on the outer end of the push rod 41.

[0040] Furthermore, a metal terminal 7 is provided on the conduction signal area 21 of the PCB board 2, and the moving contact piece 43 forms a seesaw-type separable contact fit with the metal terminal 7; a tension spring 14 is provided between the moving contact piece 43 and the PCB board 2; the seesaw-type mechanical structure composed of the moving contact piece 43 and the metal terminal 7 makes the conduction switch relatively stable, with less contact wear, and the switch is turned on and off by a simple up and down toggle action. The operation method is very intuitive and easy to understand, and can provide reliable service for a long time; and the seesaw-type switch structure usually has a compact design, which can effectively save space and make the product more compact.

[0041] The utility model utilizes the metal support 15 connected to the PCB board 2 to support the moving contact piece 43, and at the same time directly connects the metal terminal 7 to the PCB board 2. The metal support 15 and the metal terminal 7 are connected to the flat cable 3 using the printed circuit on the PCB board 2. In this way, the metal terminal 7 and the metal support 15 can be omitted from being plugged into the housing 1, thereby reducing the difficulty of installation, improving the integration of the PCB board 2, and improving the assembly efficiency. At the same time, the moving contact piece 43 is arranged parallel to the PCB board 2 to further improve the utilization rate of the internal space of the switch, making the overall structure of the switch more compact and the volume further reduced.

[0042] See also Figure 3 ,5 , 6, 8, the reversing switch structure 5 comprises: a handle 51, one end of which is provided with a first reed 52, the first reed 52 can movably press the reversing signal area 22 of the PCB board 2 to realize the reversing function of the electric tool; the other end of the handle 51 can rotatably extend to the outside of the housing 1; the end of the handle 51 provided with the first reed 52 is provided with a through groove 512 and a transverse groove 513, the through groove 512 is provided with a second spring 53, and the second spring 53 is provided with a steel ball 54; the housing 1 is provided with a baffle 13 in the area corresponding to the handle 51, the baffle 13 is provided with a wavy notch 131, the steel ball 54 movably abuts against the wavy notch 131, and is used to limit the free reset of the handle 51 after being toggled; one end of the baffle 13 provided with the wavy notch 131 is inserted into the transverse groove 513, the baffle 13 is convenient and simple to assemble relative to the handle 51, and the baffle 13 inserted into the transverse groove 513 can prevent the steel ball 54 from escaping from the handle 51. The handle 51 is provided with a second protrusion 511, and the area of the shell 1 for connecting the handle 51 is provided with a second groove 12, and the second groove 12 is coated with viscous grease 6. The second protrusion 511 is matched in the second groove 12 to extend the contact surface of the handle 51 relative to the shell 1, and the viscous grease can form a waterproof and dustproof seal between the handle 51 and the shell 1 without affecting the normal range of movement of the handle 51, thereby further improving the waterproof and dustproof effect of the product.

[0043] In summary, the signal switch device for electric tools provided by the utility model has a reasonable design and a compact structure. The design of the corrugated sealing sleeve 44 and the first groove 11 can form a seal between the conduction switch structure 4 and the housing 1. The design of the second convex portion 511 and the second groove 12 and the viscous grease 6 can form a seal between the reversing switch structure 5 and the housing 1, thereby improving the overall waterproof and dustproof effect of the product, meeting the use requirements of the product in complex environments, and facilitating market promotion and application. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A signal switch device for a power tool, comprising a housing (1), a PCB board (2) is provided in the housing (1), a conduction signal area (21) and a commutation signal area (22) are provided on the PCB board (2), and a wire harness (3) is also provided on the PCB board (2), and the wire harness (3) is used for electrically connecting a brushless motor to transmit a switch signal; A conduction switch structure (4) electrically connected to the corresponding conduction signal area (21) and a commutation switch structure (5) electrically connected to the corresponding commutation signal area (22) are provided in the housing (1); It is characterized in that The conduction switch structure (4) includes: a push rod (41), a first spring (42) is provided at one end of the push rod (41), and the other end of the first spring (42) is connected to the inner wall of the housing (1); the other end of the push rod (41) extends out of the housing (1) in a telescopic manner; A moving contact piece (43) is provided on the side end of the rod body of the push rod (41) inside the housing (1), and the moving contact piece (43) can be separated and press against the conduction signal area (21) of the PCB board (2); The commutation switch structure (5) includes: a handle (51), a first reed (52) is provided at one end of the handle (51), and the first reed (52) can be movably pressed against the commutation signal area (22) of the PCB board (2); the other end of the handle (51) extends out of the housing (1) in a rotatable manner; A sealing sleeve (44) is sleeved on the push rod (41), a first convex portion (441) is provided at one end of the sealing sleeve (44), and a first groove (11) is provided in the area of the housing (1) for connecting the push rod (41), and the first convex portion (441) is snapped into the first groove (11); the other end of the sealing sleeve (44) is closely attached to the outer end of the push rod (41); A second convex portion (511) is provided on the handle (51), a second groove (12) is provided in the area of the housing (1) for connecting the handle (51), viscous grease (6) is applied in the second groove (12), and the second convex portion (511) is fitted in the second groove (12) to form a waterproof layer between the two through the viscous grease (6).

2. The signal switch device for a power tool according to claim 1, characterized in that: A metal terminal (7) is provided on the conduction signal area (21) of the PCB board (2), and the moving contact piece (43) and the metal terminal (7) form a toggle-type separable contact fit.

3. The signal switch device for a power tool according to claim 2, characterized in that: A tension spring (14) is provided between the moving contact piece (43) and the PCB board (2).

4. The signal switch device for a power tool according to claim 1, characterized in that: A pin (8) is provided in the area of the housing (1) corresponding to the push rod (41), and the other end of the first spring (42) is sleeved outside the pin (8).

5. The signal switch device for a power tool according to claim 4, wherein: A button (9) is provided at one end of the push rod (41) outside the housing (1).

6. The signal switch device for a power tool according to claim 1, characterized in that: The sealing sleeve (44) adopts a corrugated stretchable structure.

7. The signal switch device for a power tool according to claim 1, characterized in that: A resistance signal area (23) is provided on the PCB board (2), a second reed (45) is inserted on the push rod (41), and the second reed (45) is in contact with the resistance signal area (23).

8. The signal switch device for a power tool according to claim 1, characterized in that: The end of the first reed (52) provided on the shift lever (51) is provided with a through groove (512) and a transverse groove (513). A second spring (53) is provided in the through groove (512), and a steel ball (54) is provided on the second spring (53); a retaining piece (13) is provided in the area of the housing (1) corresponding to the shift lever (51). A wavy notch (131) is provided on the retaining piece (13), and one end of the retaining piece (13) provided with the wavy notch (131) is inserted into the transverse groove (513), and the steel ball (54) is movably abutted in the wavy notch (131).

9. The signal switch device for a power tool according to claim 1, characterized in that: Glue (10) is dot-applied between the outgoing end of the cable (3) and the housing (1).

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