Lever-driven metal shell sealed microswitch

Abstract

The utility model discloses a lever drive formula metal shell sealed micro -switch belongs to electromechanical assembly technical field. It includes metal shell, micro -switch unit, press handle, spring, press the piece, torsional spring and rivet axle. Press the piece is hinged on the upper end of shell through rivet axle and torsional spring, and one end extends to the top of press handle, and press handle is connected with the upper end of micro -switch unit through spring. Pressing press the piece can make it as effort -saving lever to press press handle, and then triggers the contact switching inside micro -switch unit. O type sealing ring is equipped between press handle and shell, and the bottom of micro -switch unit is filled with epoxy resin glue, and the whole sealing is realized jointly. The utility model discloses through lever structure has increased the action stroke, has reduced the operating force, and has good sealing property and mechanical strength simultaneously, is suitable for dust, humid etc. harsh environment, has solved the problem that traditional micro -switch environment adaptability is poor, and the stroke margin is small.

Description

Technical Field

[0001] This utility model belongs to the field of electromechanical component technology, specifically relating to a lever-driven metal-cased sealed micro switch. Background Technology

[0002] Microswitches, also known as sensitive switches, are characterized by their sensitive operation and high stroke accuracy. Typically, microswitches employ an unsealed structure and lack sealing capabilities; furthermore, their short stroke requires precise installation and debugging, making it difficult to utilize the switch's overtravel effectively, and prone to malfunction due to insufficient or excessive pressure. Chinese invention patent CN107464713B discloses a deformable microswitch, primarily composed of a housing, drive rod, common terminal, A terminal, B terminal, connecting piece, pull rod, pressure rod, support block, tension spring, return spring, pins, and contacts. However, its complex housing structure is unsuitable for larger microswitch units, and its sealing and environmental adaptability remain unresolved. Summary of the Invention

[0003] The purpose of this invention is to provide a lever-driven, metal-cased sealed micro switch to solve the problems of poor environmental adaptability, small stroke margin, and large operating force of existing micro switches.

[0004] The technical solution of this utility model is: a lever-driven metal shell sealed micro switch, including a metal shell with an irregular cavity inside, a micro switch unit is provided in the irregular cavity, a handle is connected to the upper end of the micro switch unit by a spring, a rivet shaft is provided on the upper end surface of the metal shell, a torsion spring and a pressing plate are sleeved on the rivet shaft, and one end of the pressing plate extends to the top of the handle. Pressing the actuating piece causes it to rotate around the rivet shaft and press down the handle, causing the handle to retract into the metal housing, thereby pressing the micro switch unit and causing its internal contacts to switch states.

[0005] Preferably, the irregular cavity of the metal shell includes a rectangular cavity at the bottom and a right-angled trapezoidal cavity communicating with the rectangular cavity. A pair of ear plates are provided on the outer side of the inclined surface of the right-angled trapezoidal cavity, and a frame structure is integrally connected between the two ear plates.

[0006] Preferably, the rivet shaft is fastened to the pair of ear plates by riveting, and one end of the pressing piece is provided with a round hole, which is riveted and fixed to the rivet shaft together with the torsion spring, and can rotate around it; The torsion spring is used to provide clockwise torque to the push plate, so that it always maintains pre-tight contact with the push handle.

[0007] Preferably, the push handle is inserted into the irregular cavity through a hole at the upper end of the rectangular cavity of the metal housing, and its lower end is connected to a spring. The other end of the spring is supported on the upper surface of the micro switch unit, and the spring is always in a compressed state.

[0008] Preferably, an O-ring is provided between the handle and the mating hole of the metal shell to achieve a seal.

[0009] Preferably, the micro switch unit is disposed in the rectangular cavity of the metal shell, and a riveting and shrinking structure is provided at the position where the lower end of the metal shell contacts the micro switch unit, for limiting and fixing the micro switch unit.

[0010] Preferably, epoxy resin is used to fill the gap between the lower end of the micro switch unit and the inner bottom of the metal housing to achieve bottom sealing and fixation.

[0011] Compared with existing technologies, this utility model has the following advantages: the lever-driven metal-cased sealed micro switch features sealing, labor saving, and a large stroke range. 1) The sealing structure achieves dynamic sealing, making it suitable for humid environments and enabling reliable use in harsh environments such as sandstorms, salt spray, and humidity; 2) By adopting a labor-saving lever structure, the pressing force required to trigger the switch can be reduced, while increasing the switch's operating stroke and overtravel range, making it easy to install and use. This solves the shortcomings of traditional micro switches in terms of environmental adaptability and small stroke margin, improving adaptability to harsh operating environments and reducing the difficulty and requirements of installation and use; 3) The metal casing structure has high strength, improving the switch's durability. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the specific embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a front view of the lever-driven metal-cased sealed micro switch of this utility model; Figure 2 This is a side view of the lever-driven metal-cased sealed micro switch of this utility model; In the diagram, 1-press plate, 2-press handle, 3-sealing ring, 4-metal housing, 5-micro switch unit, 6-spring, 7-torsion spring, 8-rivet shaft, 9-epoxy resin adhesive. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. Any modifications, substitutions and alterations made based on ordinary technical knowledge and conventional means in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0015] Reference Figure 1 and Figure 2 This invention provides a lever-driven, metal-cased sealed micro switch to address the shortcomings of existing micro switches in terms of sealing and durability, thereby improving the switch's environmental adaptability and reliability. By employing a force-saving lever-driven structure, the pressing force required to trigger the switch can be reduced, while increasing the switch's travel and overtravel capabilities, making it easier to install and use.

[0016] The sealed micro switch of this utility model includes a push plate 1, a torsion spring 7, a riveting shaft 8, a metal housing 4, a push handle 2, an O-ring seal 3, a spring 6, and a micro switch unit 5.

[0017] One end of the push plate 1 has a round hole. The torsion spring 7 and the push plate 1 are installed and fixed to the ear plate of the metal housing 4 by the riveting shaft 8. The push plate 1 can rotate around the riveting shaft 8. The torsion spring 7 provides clockwise torque to the push plate 1, keeping it in a pre-tight state against the handle 2. The handle 2 is installed in the hole of the metal housing 4. A spring 6 is installed at its lower step. The other end of the spring 6 is supported on the upper end face of the micro switch unit 5, so that the spring 6 is always in a compressed state, providing a rebound force for the handle 2. The handle 2 and the metal housing 4 are dynamically sealed by an O-ring seal 3. The micro switch unit 5 is installed in the rectangular cavity at the lower end of the metal housing 4. The micro switch unit 5 is limited and fixed by riveting the center positions of the two lower surfaces of the metal housing 4. Epoxy resin 9 is filled into the gap between the lower end of the micro switch unit 5 and the inner bottom of the metal housing 4 for sealing.

[0018] Working Principle: When the actuating piece 1 is not pressed by an external force, the handle 2 remains in the state shown in the diagram under the preload of the spring 6. At this time, the lower end of the handle 2 has no pressing effect on the micro switch unit 5, and the switch maintains a circuit state where the normally closed pin is conducting and the normally open pin is disconnected. When the actuating piece 1 is subjected to an external driving force and rotates clockwise around the riveting shaft 8, it presses the handle 2, causing it to move downward along the axial direction. Due to the pressing action of the handle 2, the internal contacts of the micro switch unit 5 flip, the normally closed pin switches from conducting to disconnected, and the normally open pin switches from disconnected to conducting, realizing the on / off switching function of the circuit. When the pressing force on the actuating piece 1 is removed, the actuating piece 1 and the handle 2 automatically reset under the reset force of the spring 6, and the micro switch unit 5 also automatically resets, restoring the switch circuit to its initial state and completing one operation cycle.

[0019] The lever-driven metal-cased sealed micro switch provided by this utility model has been described in detail above. Specific examples have been used to illustrate the structure and working principle of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the scope of protection of the claims of this utility model.

Claims

1. A lever-driven, metal-cased, sealed micro switch, characterized in that: The device includes a metal shell (4) with an irregular cavity inside, a micro switch unit (5) inside the irregular cavity, a handle (2) connected to the upper end of the micro switch unit (5) by a spring (6), a rivet shaft (8) on the upper surface of the metal shell (4), a torsion spring (7) and a pressing piece (1) on the rivet shaft (8), one end of the pressing piece (1) extending above the handle (2); pressing the pressing piece (1) can make it rotate around the rivet shaft (8) and press down the handle (2), so that the handle (2) retracts into the metal shell (4), thereby pressing the micro switch unit (5) to switch the state of its internal contacts.

2. The lever-driven metal-cased sealed micro switch according to claim 1, characterized in that: The irregular cavity of the metal shell (4) includes a rectangular cavity at the bottom and a right-angled trapezoidal cavity connected to the rectangular cavity. A pair of ear plates are provided on the outer side of the inclined surface of the right-angled trapezoidal cavity, and a frame structure is integrally connected between the two ear plates.

3. The lever-driven metal-cased sealed micro switch according to claim 1, characterized in that: The rivet shaft (8) is fastened to a pair of ear plates by riveting. One end of the pressing piece (1) is provided with a round hole, which is riveted and fixed to the rivet shaft (8) together with the torsion spring (7) and can rotate around it. The torsion spring (7) is used to provide clockwise torque to the push plate (1) so that it always maintains pre-tight contact with the push handle (2).

4. The lever-driven metal-cased sealed micro switch according to claim 3, characterized in that: The handle (2) is inserted into the irregular cavity through the hole at the upper end of the rectangular cavity of the metal shell (4), and its lower end is connected to the spring (6). The other end of the spring (6) is supported on the upper surface of the micro switch unit (5), and the spring (6) is always in a compressed state.

5. The lever-driven metal-cased sealed micro switch according to claim 4, characterized in that: An O-ring (3) is provided between the mating hole of the handle (2) and the metal shell (4) to achieve sealing.

6. The lever-driven metal-cased sealed micro switch according to claim 1, characterized in that: The micro switch unit (5) is disposed in the rectangular cavity of the metal shell (4). The lower end of the metal shell (4) is provided with a narrowing structure formed by riveting process at the position where it contacts the micro switch unit (5), which is used to limit and fix the micro switch unit (5).

7. The lever-driven metal-cased sealed micro switch according to claim 1, characterized in that: The gap between the lower end of the micro switch unit (5) and the inner bottom of the metal shell (4) is filled with epoxy resin glue (9) to achieve bottom sealing and fixation.

Images