Small impact-resistant two-stage push-to-travel switch

Abstract

The invention discloses a small impact-resistant two-stage press travel switch, wherein: a press rod is placed in the upper end of the housing, a spring B is sleeved on the outside of the press rod, a spring A is sleeved on the outside of the spring B and a bushing A is covered, the upper end of the press rod is inserted into a washer B for riveting, a pressing plate is inserted into a hole set in the middle of the housing, the upper end of the pressing plate is inserted into the lower end of the press rod, rocking plates A and B are respectively inserted into the middle of the torsion spring and inserted into the base, and the two ends of the pin B are inserted, and the lower ends of the rocking plates A and B are respectively against the spring sheets, and the two spring sheets are respectively installed on the micro switch, and the micro switch is fixed on the base through the pin C. The invention has a small size and strong impact resistance, avoids the energy of high-speed impact from being transmitted to the inside of the micro switch, and does not cause structural damage; it can absorb more impact energy.

Description

Technical Field

[0001] The invention belongs to the technical field of electrical appliances, and in particular relates to a small impact-resistant two-stage push-stroke switch. Background Art

[0002] The travel switches used in aviation are usually composed of a pressing mechanism and a micro switch, and their structural principles are similar. After the travel switch button is actuated, the button indirectly presses the internal micro switch. This structure is prone to indirectly transfer the external impact energy to the micro switch through related mechanisms when the external triggering speed is high and the triggering force is large (i.e., the impact is large), thereby causing damage to the micro switch. Due to space volume limitations, the volume of the travel switch cannot be designed to be larger to increase the buffer mechanism. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a small-sized, impact-resistant two-stage push-stroke switch which can avoid the energy of high-speed impact being transmitted to the inside of the micro switch and cause no structural damage; and can absorb more impact energy.

[0004] The purpose of the present invention and the solution of its main technical problems are achieved by adopting the following technical solutions:

[0005] The invention discloses a small impact-resistant two-stage push travel switch, which is characterized in that: a push rod is placed in the upper end of a housing, a spring B is placed outside the push rod, a spring A is placed outside the spring B and a bushing A is covered, a gasket B is inserted into the upper end of the push rod and riveted, the bushing A is movably connected to the push rod, a button is placed on the push rod, the bushing B is placed on the button, two gaskets B clamp the sealing ring A and fix it in the bushing B, and a cap is screwed into the housing, the upper and lower ends of the spring A respectively abut against the bushing A and the middle of the housing, and the upper and lower ends of the spring B respectively abut against the bushing A and The boss at the lower end of the push rod, the pressure plate is inserted into the hole set in the middle of the shell, the upper end of the pressure plate is inserted into the lower end of the push rod, the lower end of the pressure plate contacts the upper ends of rocking plates A and B, rocking plates A and B are respectively inserted into the middle of the torsion spring and connected with the pin B inserted into the base at both ends, one end of the two torsion springs respectively presses against the rocking plates A and B, and the other ends respectively press against the pin A inserted into the base, the lower ends of the rocking plates A and B respectively press against the spring sheets, the two spring sheets are respectively mounted on the micro switches, and the micro switches are fixed to the base by the pin C.

[0006] The button, bushing A, pressing plate and pressing rod can move up and down in the shell.

[0007] The two ends of the rocking plate A and the rocking plate B are respectively provided with arcs in positive and negative directions, and a round hole is provided in the middle. The lengths of the rocking plate A and the rocking plate B are different.

[0008] The lower end of the micro switch is connected to a wire, the wire passes through the base, and the base is fixed to the lower end of the shell.

[0009] Compared with the prior art, the present invention has obvious beneficial effects. It can be seen from the above technical scheme that: a push rod is placed in the upper end of the shell, a spring B is put on the outside of the push rod, a spring A is put on the outside of the spring B and a bushing A is covered, a gasket B is inserted into the upper end of the push rod and riveted, the bushing A is movably connected to the push rod, a button is covered on the push rod, and the bushing B is placed on the button, two washers B clamp the sealing ring A and fix it in the bushing B, and the cap is screwed into the shell, the upper and lower ends of the spring A respectively abut against the bushing A and the middle of the shell, and the upper and lower ends of the spring B respectively abut against The boss at the lower end of the bushing A and the push rod, the pressure plate is inserted into the hole set in the middle of the shell, the upper end of the pressure plate is inserted into the lower end of the push rod, the lower end of the pressure plate contacts the upper ends of the rocking plates A and B, the rocking plates A and B are respectively inserted into the middle of the torsion spring and connected with the pin B inserted into the base at both ends, one end of the two torsion springs respectively presses against the rocking plates A and B, and the other ends respectively press against the pin A inserted into the base, the lower ends of the rocking plates A and B respectively press against the spring sheets, the two spring sheets are respectively mounted on the micro switches, and the micro switches are fixed to the base by the pin C. Under the condition of no external force, rocker plates A and B are in a free state. Under the action of the torsion spring preload, they press the spring sheet and put the micro switch in a pressed-on state; under the high-speed and strong external pressure, the button moves downward, spring A is compressed, and the external impact is first absorbed; when the button moves, it drives the push rod and the pressure plate at the lower end of the push rod to move downward at the same time. The pressure plate first presses rocker plate A, which rotates around pin B, and its lower end releases the spring sheet, which returns upward, and the micro switch button automatically returns to its free position. When the micro switch release position is reached, the switch is switched; then the pressure plate presses rocker plate B, so that the micro switch pressed by rocker plate B is released and switched (same working principle as rocker plate A). After the two micro switches are completely released, the lower end of the push rod contacts the end face of the shell partition structure and cannot continue to move downward. At this time, the button will drive bushing A to compress spring B downward, and the upper end of the push rod gradually extends into the opening designed in the middle of the button, and the remaining impact is absorbed by spring B. After the external pressure is cancelled, the internal mechanism of the switch returns to its initial state under the action of spring A, spring B, and torsion spring. A two-stage press-stroke switch structure with a small volume and strong impact resistance is realized. The built-in microswitch in the structure is initially in a pressed state. When the stroke switch is pressed, the built-in microswitch is released in the reverse direction, thereby avoiding the energy of high-speed impact being transmitted to the inside of the microswitch and causing damage to its structure. At the same time, a double spring buffer mechanism is designed to allow the switch to absorb more impact energy within a limited volume. In short, the present invention has a small volume and strong impact resistance, avoids the energy of high-speed impact being transmitted to the inside of the microswitch, and does not cause structural damage; it can absorb more impact energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a partial cross-sectional view of the present invention. Figure 1 ;

[0011] Figure 2 It is a partial cross-sectional view of the present invention. Figure 2 ;

[0012] Figure 3 It is a structural schematic diagram of the pressing plate, washer B, spring B and pressing rod of the present invention;

[0013] Figure 4 It is a structural schematic diagram of the pressing plate of the present invention;

[0014] Figure 5 It is a structural schematic diagram of the rocking plate A, torsion spring, pin A, rocking plate B, and pin B of the present invention;

[0015] Figure 6 It is a structural schematic diagram of the rocking plate A, rocking plate B, and pin B of the present invention;

[0016] Figure 7 It is a structural schematic diagram of the rocking plate of the present invention;

[0017] Figure 8 It is a schematic structural diagram of the torsion spring of the present invention.

[0018] Marking in the figure

[0019] 1. Button, 2. Housing, 3. Bushing A, 4. Spring A, 5. Pressure plate, 6. Rocker A, 7. Torsion spring, 8. Pin A, 9. Spring sheet, 10. Micro switch, 11. Base, 12. Wire, 13. Bushing B, 14. Sealing ring A, 15. Washer B, 16. Washer B, 17. Spring B, 18. Push rod, 19. Rocker B, 20. Pin B, 21. Pin C. DETAILED DESCRIPTION

[0020] The specific implementation methods, structures, features and functions of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0021] The invention discloses a small impact-resistant two-stage push travel switch, characterized in that: a push rod 18 is placed in the upper end of a housing 2, a spring B17 is placed outside the push rod 18, a spring A4 is placed outside the spring B17 and a bushing A3 is covered, a gasket B16 is inserted into the upper end of the push rod 18 and riveted, the bushing A3 is movably connected to the push rod 18, a button 1 is placed on the push rod 18, a bushing B13 is placed on the button 1, two gaskets B15 clamp the sealing ring A14 and fix it in the bushing B13, and a cap is screwed into the housing 2, the upper and lower ends of the spring A4 respectively abut against the bushing A3 and the middle of the housing 2, the upper and lower ends of the spring B17 respectively abut against the bushing A3 and the push rod 18, and the upper and lower ends of the spring A4 respectively abut against the bushing A3 and the middle of the housing 2. The boss at the lower end of the rod 18, the pressure plate 5 is inserted into the hole set in the middle part of the shell 2, the upper end of the pressure plate 5 is inserted into the lower end of the pressing rod 18, the lower end of the pressure plate 5 is in contact with the upper ends of the rocking plate A6 and the upper ends of the rocking plate B19, the rocking plates A6 and B19 are respectively inserted into the middle of the torsion spring 7 and connected with the pin B20 inserted into the base 11 at both ends, one end of the two torsion springs 7 respectively presses against the rocking plates A6 and B19, and the other ends respectively press against the pin A8 inserted into the base 11, the lower ends of the rocking plates A6 and B19 respectively press against the spring sheets 9, the two spring sheets 9 are respectively mounted on the micro switches 10, and the micro switches 10 are fixed to the base 11 by the pins C21.

[0022] The button 1 , the bushing A3 , the pressure plate 5 , and the push rod 18 can move up and down in the housing 2 .

[0023] The two ends of the rocking plate A6 and the rocking plate B19 are respectively provided with arcs in positive and negative directions, and a round hole is provided in the middle. The lengths of the rocking plate A6 and the rocking plate B19 are different.

[0024] The lower end of the micro switch 10 is connected to a wire 12 , and the wire 12 passes through a base 11 , and the base 11 is fixed to the lower end of the housing 2 .

[0025] When in use, without being subjected to external force, rocking plates A6 and B19 are in a free state, and under the action of the preload force of the torsion spring 7, they press the spring sheet 9 and put the micro switch 10 in a pressed-on state; the button 1 moves downward, the spring A4 is compressed, and when the button 1 moves, it simultaneously drives the push rod 18 and the pressure plate 5 at the lower end of the push rod 18 to move downward, and the pressure plate 5 first presses the rocking plate A6, and the rocking plate A6 rotates around the pin B20, and its lower end releases the spring sheet 9, and the spring sheet 9 returns upward, and at the same time, the button of the micro switch 10 automatically returns to its free position, and when it reaches the release position point of the micro switch 10, the switch is switched; then the pressure plate 5 presses the rocking plate B19, so that the micro switch 10 pressed by the rocking plate B19 is released and switched (the same working principle as the rocking plate A6). After the two micro switches 10 are fully released, the lower end of the push rod 18 contacts the end face of the partition structure of the housing 2 and cannot move downward. At this time, the button 1 will drive the bushing A3 to compress the spring B17 downward, and the upper end of the push rod 18 gradually extends into the opening designed in the middle of the button 1, and the remaining impact is absorbed by the spring B17. After the external pressure is removed, the internal mechanism of the switch returns to its initial state under the action of the spring A4, spring B17, and torsion spring 7.

[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A small impact-resistant two-stage push-stroke switch, characterized in that; The upper end of the housing (2) is placed in a push rod (18), a spring B (17) is placed outside the push rod (18), a spring A (4) is placed outside the spring B (17), and a bushing A (3) is placed on the cover. The upper end of the push rod (18) is inserted into a gasket B (16) and riveted. The bushing A (3) is movably connected to the push rod (18), a button (1) is placed on the top of the push rod (18), and a bushing B (13) is placed on the button (1). Two gaskets B (15) clamp the sealing ring. A (14) is fixed in the bushing B (13) and screwed into the cap connected to the housing (2). The upper and lower ends of the spring A (4) respectively abut against the bushing A (3) and the middle of the housing (2). The upper and lower ends of the spring B (17) respectively abut against the bushing A (3) and the boss at the lower end of the push rod (18). The pressure plate (5) is inserted into the hole set in the middle of the housing (2). The upper end of the pressure plate (5) is inserted into the lower end of the push rod (18). The lower end of the pressure plate (5) is connected to the rocking plate A ( The upper end of the torsion spring (6) and the upper end of the rocking plate B (19) are in contact with each other. The rocking plates A (6) and B (19) are respectively inserted into the middle of the torsion spring (7) and the pin B (20) inserted into the base (11) and connected at both ends. One end of the two torsion springs (7) respectively abuts against the rocking plates A (6) and B (19), and the other end abuts against the pin A (8) inserted into the base (11). The lower ends of the rocking plates A (6) and B (19) respectively abut against the spring sheets (9). The two spring sheets (9) are respectively mounted on the micro switch (10). The micro switch (10) is fixed to the base (11) by the pin C (21). The button (1), the bushing A (3), the pressure plate (5), and the push rod (18) can move up and down in the housing (2). The two ends of the rocking plates A (6) and B (19) are respectively provided with arcs in both positive and negative directions, and a round hole is provided in the middle. The lengths of the rocking plates A (6) and B (19) are different.

2. The small impact-resistant two-stage push-type travel switch according to claim 1, characterized in that; The lower end of the micro switch (10) is connected to a wire (12), and the wire (12) passes through a base (11), and the base (11) is fixed to the lower end of the housing (2).

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