Compact switch structure for forward and reverse conversion control

Abstract

The utility model discloses a compact switch structure for forward and reverse conversion control. The compact switch structure comprises a switch base body; the circuit board is mounted in the switch base body; the positive and negative rotation control unit comprises a sliding frame, a first contact piece, a deflector rod and a push rod; the sliding frame is installed in the switch base body in a sliding mode, the first contact piece is arranged on the sliding frame, moves along with the sliding frame and is used for making contact with a positive and negative rotation electrode on a circuit board, the shifting rod and the push rod are rotationally arranged, and the push rod is driven by rotation of the shifting rod to do linear motion on the switch base body. A guide plate is arranged on the sliding frame, and a sliding groove is formed in the guide plate; the push rod is provided with a guide column, the guide column is arranged in the sliding groove to slide, and the sliding frame can be driven to slide by driving the push rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switches for power tools, in particular to a compact forward-reverse switching control switch structure. BACKGROUND

[0002] In the existing control switch structure of power tools, reference can be made to the Chinese patent application with publication number CN111933466A proposed by the applicant, see Figure 6 of the patent, which adopts a relatively traditional structure of the forward-reverse control mechanism, that is, the slider and the push rod are designed in an integrated manner. Although this method is simple in structure and direct in transmission, in order to further improve the compactness of the switch, one of the feasible ways is to compress the size of the forward-reverse switching lever. Since the size of the forward-reverse lever is shortened, the stroke of the track for guiding the slider on the push rod is insufficient, which cannot meet the reversing requirement well.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as the closest prior art to the present application. SUMMARY

[0004] Based on this, the present application provides a compact forward-reverse switching control switch structure to solve one of the above technical problems.

[0005] The technical solution adopted by the present application to solve its technical problems is: a compact forward-reverse switching control switch structure, comprising: a switch base body; a circuit board installed in the switch base body; a forward-reverse control unit comprising a sliding frame, a first contact piece, a lever, and a push rod;

[0006] The sliding frame is slidingly installed in the switch base body, the first contact piece is arranged on the sliding frame and follows the displacement thereof to contact the forward-reverse electrode on the circuit board, the lever and the push rod are rotationally arranged, and the push rod is driven to move linearly on the switch base body through the rotation of the lever;

[0007] A guide plate is arranged on the sliding frame, and a sliding groove is formed in the guide plate; a guide column is arranged on the push rod, the guide column is slidingly arranged in the sliding groove, and the sliding frame is driven to slide by driving the push rod.

[0008] In some embodiments, the length direction of the sliding groove and the linear motion track of the push rod have an included angle, and the included angle is 0-80°.

[0009] In some embodiments, the included angle is 30-45 degrees.

[0010] In some embodiments, a speed control unit is further included, which comprises a pressing rod, a second contact piece and a third contact piece arranged on the pressing rod, a spring for driving the pressing rod back, the second contact piece being in contact with a speed regulating resistor on the circuit board, and the third contact piece being used for contacting a on-off electrode on the circuit board.

[0011] In some embodiments, a limiting protrusion is arranged on the pressing rod, and a stopper is arranged on the push rod relative to the side of the pressing rod, the stopper being used for blocking the limiting protrusion to limit the pressing rod from being pressed down.

[0012] In some embodiments, a handle is further included, the top of the pressing rod being fixed on the handle, a first guide slot, a second guide slot and a limiting rib arranged between the two being arranged on the handle, and a guide block being arranged on the top of the push rod, the guide block being selectively arranged in the first guide slot or the second guide slot to realize forward and reverse switching.

[0013] In some embodiments, when the guide block is arranged at the limiting rib, the stopper on the push rod blocks the limiting protrusion on the pressing rod.

[0014] In some embodiments, a spring is arranged below the push rod for contacting the bottom end of the push rod, and a groove is arranged in the middle of the spring.

[0015] The application has the beneficial effects that: by integrating the sliding frame, the first contact piece, the push rod and other components together, and by adopting the sliding slot with a specific angle matched with the guide column, the sliding frame can realize a larger effective stroke in a smaller space, thereby improving the overall compactness of the switch, and the switch is suitable for application in small-sized or portable electric tools.

[0016] Due to the adoption of the sliding slot with a specific included angle, the linear motion of the push rod can be converted into the displacement of the sliding frame, which not only increases the sliding distance, but also ensures the stability and accuracy in the sliding process, and helps to improve the reliability of the reversing operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a structural schematic diagram of the present application.

[0019] Figure 2 is a structural schematic diagram of the present application hidden switch base.

[0020] Figure 3 is a structural schematic diagram of the forward and reverse control unit and the speed control unit of the present application.

[0021] Figure 4 is an exploded view of the structure of the present application.

[0022] Brief Description of the Drawings: 1. Switch base, 2. Circuit board, 3. Forward and reverse control unit, 31. Slide bracket, 311. Guide plate, 312. Slide groove, 32. First contact, 33. Lever, 331. Guide block, 34. Push rod, 341. Guide post, 342. Stop block, 35. Spring, 351. Groove, 4. Speed control unit, 41. Pressing rod, 411. Limiting protrusion, 42. Second contact, 43. Third contact, 44. Spring, 5. Handle, 51. First guide groove, 52. Second guide groove, 53. Limiting rib. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on that a person of ordinary skill in the art can realize, when the combination of the technical solutions appears contradictory or unachievable, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present application.

[0024] In the embodiments of the present application, please refer to Figures 1-4 the switch structure for compact forward and reverse conversion control, comprising: a switch base 1, including a base for supporting a circuit board 2 and various components, and a switch shell; a circuit board 2 installed in the switch base 1, the circuit board 2 is provided with electrodes and resistance elements for realizing various functions (such as forward and reverse rotation, speed adjustment, etc.); a forward and reverse control unit 3, comprising a slide bracket 31, a first contact 32, a lever 33, and a push rod 34, the lever 33 and the push rod 34 constitute a mechanical transmission system, the lever 33 drives the push rod 34 to move linearly by rotating. One end of the push rod 34 is connected to the slide bracket 31, and the other end is driven by the lever 33, which allows the user to accurately control the position of the slide bracket 31 by simply rotating the handle 5; in the present application, the lower end of the lever 33 is rotationally connected to the upper end of the push rod 34, and the push rod 34 moves linearly, and the rotation or swing of the upper end of the lever 33 can change the height of the lower end of the lever 33 and drive the push rod 34 to move.

[0025] The sliding frame 31 is slidingly installed in the switch base 1, the first contact 32 is arranged on the sliding frame 31 to follow the displacement thereof for contacting the forward / reverse electrodes on the circuit board 2, the lever 33 is rotationally arranged with the push rod 34, the rotation of the lever 33 drives the push rod 34 to move linearly on the switch base 1, when the sliding frame 31 moves, the first contact 32 will displace and contact or disconnect the forward / reverse electrodes on the circuit board 2, thereby changing the rotation direction of the motor.

[0026] In order to ensure that the sliding frame 31 can move smoothly and accurately, a guide plate 311 is assembled on the sliding frame 31, and a sliding groove 312 with a specific angle is formed on the guide plate 311. A guide column 341 is arranged on the push rod 34, which is embedded in the sliding groove 312 and can slide along the sliding groove 312. Such a design not only saves space, but also increases the effective stroke of the sliding frame 31, so that sufficient reversing operation can be completed even in limited space.

[0027] Some preferred / improved embodiments based on the above embodiments will be further described below. Any one or a plurality of the following embodiments can be selected and combined.

[0028] Further, the length direction of the sliding groove 312 and the linear motion trajectory of the push rod 34 have an included angle, and the included angle is 0-80°. As a preferred, the included angle is 30-45 degrees.

[0029] The selection of the included angle between the length direction of the sliding groove 312 and the linear motion trajectory of the push rod 34 (especially the preferred angle of 30-45 degrees) is the result of comprehensive consideration based on multiple factors. The specific selection basis and benefits include:

[0030] In a compact switch design, by setting an appropriate included angle, a longer effective stroke can be achieved in limited space. For example, when the included angle is close to 45 degrees, for a given linear displacement of the push rod 34, the sliding frame 31 can obtain a larger lateral displacement, which helps to reduce the overall structure size.

[0031] The selection of the included angle also affects the efficiency of force transmission from the push rod 34 to the sliding frame 31. The angle range of 30-45 degrees provides a good trade-off, which not only ensures sufficient force transmission to drive the sliding frame 31 to move, but also avoids excessive energy loss or wear due to too small angle.

[0032] An appropriate angle helps to ensure that the sliding frame 31 moves smoothly along its predetermined path, avoiding unstable sliding or jamming due to too large angle. The included angle of 30-45 degrees can make the sliding of the guide column 341 in the sliding groove 312 more smooth, thereby improving the accuracy and reliability of the reversing operation.

[0033] In addition, within this angle range, certain mechanical advantage can be obtained by leveraging the principle, so that a smaller input force can produce a larger output displacement. At the same time, a reasonable angle can also help to disperse the pressure of the contact point, reduce the friction between the sliding groove 312 and the guide column 341, and prolong the service life.

[0034] At the same time, considering the processing errors, material properties and other factors in actual production, 30-45 degrees is an angle interval that is easy to achieve and can maintain high consistency. It allows a certain tolerance range without significantly affecting the functional performance.

[0035] Further, it also includes a speed control unit 4, which includes a pressure rod 41, a second contact piece 42 and a third contact piece 43, and a spring 44 for driving the pressure rod 41 back. Users can adjust the position of the pressure rod 41 by pressing the handle 5, thereby changing the degree of contact between the second contact piece 42 and the speed regulating resistor, to achieve the purpose of adjusting the motor speed. The third contact piece 43 is used to contact the on-off electrode on the circuit board 2 to realize the on and off of the power supply.

[0036] In order to prevent accidental start, a limit bump 411 is provided on the pressure rod 41, and a block 342 is provided on the corresponding side of the push rod 34. When the lever 33 is in the OFF position, the block 342 will block the limit bump 411, preventing the pressure rod 41 from being pressed further, thereby providing additional safety protection.

[0037] Further, it also includes a handle 5, the top of the pressure rod 41 is fixed on the handle 5, the handle 5 is also provided with a first guide slot 51, a second guide slot 52 and a limiting rib 53 between them, and the top of the lever 33 is provided with a guide block 331, which can be selectively placed in the first guide slot 51 or the second guide slot 52 to realize forward and reverse switching. The handle 5 not only serves as the main interface for user operation, but also integrates the first guide slot 51, the second guide slot 52 and the limiting rib 53 to guide the guide block 331 at the top of the lever 33, realizing forward and reverse switching. At the same time, when the guide block 331 is located at the limiting rib 53, it will limit the action of the block 342 to the pressure rod 41, ensuring the safety of operation.

[0038] Further, the lower part of the push rod 34 is provided with a spring 35 for contacting the bottom end of the push rod 34, and a recess 351 is provided in the middle of the spring 35. This allows users to feel different gears and hear confirmation sounds, improving the user's operation experience.

[0039] So far, various embodiments of the present application have been described in detail. In order not to obscure the concept of the present application, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0040] Finally, it should be noted that the above is only the preferred embodiments of the present application, the foregoing examples are used to illustrate the technical solutions of the present application, but not limited; although the present application is described in detail with reference to the foregoing examples, those skilled in the art will understand that the technical solutions described in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalent; and these modifications or replacements do not drive the essence of the corresponding technical solutions out of the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A compact switch structure for forward and reverse conversion control, comprising: a switch base; a circuit board installed in the switch base; a forward and reverse control unit comprising a sliding frame, a first contact, a lever, and a push rod; the sliding frame is slidingly installed in the switch base, the first contact is arranged on the sliding frame to follow the displacement thereof and to contact a forward and reverse electrode on the circuit board, the lever is rotationally arranged with the push rod, and the push rod is linearly moved on the switch base by rotation of the lever; characterized in that a guide plate is arranged on the sliding frame, a sliding groove is formed in the guide plate, a guide post is arranged on the push rod, the guide post is slidingly arranged in the sliding groove, and the sliding frame is slidingly driven by driving the push rod.

2. A compact forward-reverse changeover control switch structure according to claim 1, characterized in that, an angle between a length direction of the sliding groove and a linear motion track of the push rod is 0-80°.

3. A compact forward-reverse changeover control switch structure according to claim 2, characterized in that, the angle is 30-45°.

4. A compact forward-reverse changeover control switch structure according to claim 1, characterized in that, a speed control unit is further included, which comprises a pressing rod, a second contact and a third contact arranged on the pressing rod, and a spring for driving the pressing rod back to the original position, the second contact is in contact with a speed regulating resistor on the circuit board, and the third contact is in contact with a on-off electrode on the circuit board.

5. A compact forward-reverse changeover control switch structure according to claim 4, characterized in that, a limiting protrusion is arranged on the pressing rod, a stopper is arranged on the side of the push rod relative to the pressing rod, the stopper can be used to block the limiting protrusion to limit the pressing rod from being pressed down.

6. A compact forward-reverse changeover control switch structure according to claim 5, characterized in that, a handle is further included, the top of the pressing rod is fixed on the handle, a first guide groove, a second guide groove, and a limiting rib arranged between the two guide grooves are arranged on the handle, a guide block is arranged on the top of the lever, and the guide block is selectively arranged in the first guide groove or the second guide groove to realize forward and reverse switching.

7. A compact forward-reverse changeover control switch structure according to claim 6, characterized in that, when the guide block is arranged at the limiting rib, the stopper on the push rod blocks the limiting protrusion on the pressing rod.

8. A compact forward-reverse changeover control switch structure according to claim 1, characterized in that, a spring is arranged below the push rod to contact the bottom end of the push rod, and a groove is arranged in the middle of the spring.

Images