Pull cord switch

Abstract

The utility model relates to industrial safety control equipment technical field discloses a kind of pull rope switches, pull rope switch includes base, outer cover, built-in switch, mounting mechanism and reset mechanism, mounting mechanism is set in the lower end of base, bottom plate is provided with guide slot and rotation groove, mechanism block inside motor drive T-shaped rod sliding fit in guide slot and rotate and be clamped into rotation groove, bottom plate is locked with mechanism block by bolt second time, reset mechanism is set in built-in switch inside, fixed telescopic rod in reset slot inside and slidingly connects reset rod, telescopic rod drives reset rod active resistance button, rubber ring sealing is set on the upper end of reset slot.The utility model is locked by motor drive T-shaped rod rotary joint cooperation bolt, solve the problem that pull rope switch rigidity fixed leads to installation maintenance is complicated, the problem that button spring fails to reset is solved by initiative reset mechanism.

Description

Technical Field

[0001] This utility model relates to the field of industrial safety control equipment technology, and in particular to a pull rope switch. Background Technology

[0002] Pull-cord switches, as a critical safety protection device, are widely used in belt conveyors and industrial production lines. They are mainly used to quickly stop equipment by pulling a rope in emergencies. In practical applications, existing pull-cord switches are rigidly fixed to the mounting bracket and wall by bolts directly passing through the base to ensure stability. However, pull-cord switches themselves have a certain weight, and installers need to continuously hold the pull-cord switch with one hand to align it with the mounting hole while using the other hand to insert and tighten the bolts. The limited hand operating space during installation not only increases the labor intensity of installers but also makes disassembly and maintenance cumbersome, reducing the efficiency of equipment maintenance.

[0003] Furthermore, pull-cord switches rely on internal mechanical structures for operation and reset. During long-term and frequent use, the reset spring inside the pull-cord switch button experiences metal fatigue due to prolonged compression and rebound. Consequently, the spring's elasticity gradually weakens or even completely fails. Once the reset spring fails, the pressed button cannot automatically return to its initial state using its own elasticity, causing the pull-cord switch to jam or fail to trigger normally the next time. Existing pull-cord switches lack an auxiliary forced reset mechanism, and the only solution to the spring failure problem is to replace the entire pull-cord switch, which increases the operating cost of the equipment and wastes resources.

[0004] Therefore, this utility model proposes a pull cord switch to overcome the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems in the existing technology, the pull cord switch usually adopts a rigid fixing method with bolts, which makes the installation process cumbersome, disassembly and maintenance extremely inconvenient, and requires continuous support during installation, and the internal reset spring of the pull cord switch button ages and fails after long-term use, resulting in the inability to automatically reset. The present invention aims to provide a pull cord switch with an improved structure that can effectively solve the above problems.

[0006] This utility model provides a pull cord switch, including: a base, an outer cover fixedly connected to the upper end of the base, a built-in switch fixedly installed on the right end of the base, a mounting mechanism disposed at the lower end of the base, and a reset mechanism disposed inside the built-in switch.

[0007] The installation mechanism includes a base plate and a mechanism block fixedly connected to the lower end of the base. The lower end of the base plate has a guide groove, and the upper end of the guide groove has a rotating groove. The upper end of the mechanism block has a position groove, and a motor is fixedly installed inside the position groove. A T-shaped rod is fixedly connected to the output end of the motor. The T-shaped rod is slidably engaged inside the guide groove, and the T-shaped rod is driven to rotate by the motor and engages inside the rotating groove.

[0008] Furthermore, the reset mechanism includes a reset groove inside the built-in switch, a telescopic rod is fixedly installed inside the reset groove, and a reset rod is slidably connected thereto. A position groove two is opened at the lower end of the reset rod, and the output end of the telescopic rod is fixedly connected inside the position groove two. A button is movably installed at the upper end of the built-in switch, and the upper end of the reset rod abuts against the button.

[0009] Preferably, the base plate has through holes at the four corners, and the upper four corners of the mechanism block have threaded holes corresponding to the through holes. Bolts are inserted into the through holes and the bolts are threaded into the threaded holes. This combination of through holes and threaded holes allows the bolts to pass through the base plate and be tightly connected to the mechanism block, thereby providing a stronger mechanical locking force based on the initial positioning of the T-shaped rod, ensuring that the pull rope switch remains stable under long-term vibration.

[0010] Preferably, a rubber groove is provided at the upper end of the reset groove, and a rubber ring is fixedly installed inside the rubber groove. The reset rod passes through the rubber ring and is in sealed contact with the rubber ring. By setting a rubber groove and a rubber ring at the opening of the reset groove, the elastic deformation characteristics of the rubber material are used to tightly cover the reset rod, which can effectively prevent external dust or moisture from entering the reset mechanism and protect precision components such as the telescopic rod from contamination.

[0011] Preferably, a retaining ring is fixedly connected to the lower outer end of the reset rod. The outer wall of the retaining ring slides against the inner wall of the reset groove. The retaining ring increases the contact area between the reset rod and the inner wall of the reset groove, which plays a good guiding role and prevents the reset rod from tilting during movement. It also serves as a stroke limiter to prevent the reset rod from coming off.

[0012] Preferably, the reset groove is located at the front and rear ends inside the built-in switch, and the reset rod moves vertically along the length of the reset groove. The double-sided layout or front and rear end layout of the reset groove enables the reset mechanism to be balanced under force, ensuring a smooth and reliable push action on the button. The vertical movement path ensures the direct transmission efficiency of the reset force.

[0013] Preferably, the guide groove is opened on the left and right sides of the lower end of the base plate, and the position groove is opened on the left and right sides of the upper middle part of the mechanism block. This symmetrical layout design enhances the uniformity of the force on the installation structure, making the base balanced left and right during installation and less prone to tilting.

[0014] Preferably, a buckle is fixedly installed on the right end of the built-in switch. The buckle serves as an interface component for connecting the external pull rope. It adopts a sturdy ring structure, which allows users to quickly tie the pull rope and ensures that the pull rope action can be accurately transmitted to the built-in switch.

[0015] Preferably, the upper end face of the mechanism block is in close contact with the lower end face of the base plate, and the telescopic rod is vertically fixed to the bottom of the reset groove. The close contact between the mechanism block and the base plate ensures the integrity after installation, and the telescopic rod fixed to the bottom of the groove provides a stable support reaction point for the reset action.

[0016] This utility model has the following beneficial effects: 1. This utility model solves the problems of cumbersome installation, difficult disassembly and maintenance, and limited hand support during installation caused by the rigid fixation of existing pull rope switches. It achieves the effect of not requiring continuous hand support during installation, reducing the labor intensity of workers, and taking into account both the convenience of initial installation and the stability of final fixation.

[0017] 2. This utility model solves the problem that the spring inside the existing switch button becomes less elastic and cannot perform automatic reset after long-term use due to fatigue or aging by setting an active reset mechanism inside the built-in switch. The mechanism uses a telescopic rod to drive the reset rod to move vertically in the reset groove and actively abut against the bottom of the button. This achieves the effect of providing forced reset power when the physical spring fails, ensuring that the switch can be restored to its initial state in time and ensuring the normal operation of the equipment.

[0018] 3. This utility model solves the problem of impurities and dust in the industrial environment entering the reset mechanism and causing precision components such as telescopic rods to jam or be damaged. It achieves the effect of effectively isolating the external environment, protecting the internal drive components, and extending the service life of the entire reset mechanism. Attached Figure Description

[0019] Figure 1 This is a perspective view of a pull cord switch proposed in this utility model; Figure 2 This is a cross-sectional view of the installation mechanism of a pull-cord switch proposed in this utility model; Figure 3 This is a cross-sectional view of the reset mechanism of a pull-cord switch proposed in this utility model; Figure 4 This is a partial structural cross-sectional view of the reset mechanism of a pull-cord switch proposed in this utility model.

[0020] Legend: 1. Base; 2. Mounting mechanism; 201. Base plate; 202. Guide groove; 203. Rotary groove; 204. Mechanism block; 205. Position groove one; 206. Motor; 207. T-shaped rod; 208. Through hole; 209. Threaded hole; 210. Bolt; 3. Reset mechanism; 301. Reset groove; 302. Telescopic rod; 303. Reset rod; 304. Position groove two; 305. Rubber groove; 306. Rubber ring; 307. Retaining ring; 4. Outer cover; 5. Button; 6. Buckle ring; 7. Built-in switch. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model. Example

[0022] Please refer to Figures 1 to 4 This utility model provides a pull cord switch. The purpose of this utility model is to solve the structural defects in the prior art, such as the rigid fixation of the pull cord switch leading to cumbersome installation and maintenance, and the failure of the internal spring of the button 5 due to aging and failure, resulting in the inability to automatically reset.

[0023] Please refer to Figure 1 The pull-cord switch includes a base 1, an outer cover 4 fixedly connected to the upper end of the base 1, and an internal switch 7 fixedly installed on the right end of the base 1. The base 1 serves as the main load-bearing component to support the overall structure. The outer cover 4 is used to shield and protect the internal electrical components. The internal switch 7 is used to respond to the pull-cord action and output an electrical signal. A buckle 6 is fixedly installed on the right end of the internal switch 7. The buckle 6 is used to connect to the external pull-cord device. A button 5 is movably installed on the upper end of the internal switch 7. The button 5 is used for manual pressing operation or reset. To solve the problem of cumbersome installation, an installation mechanism 2 is fixedly connected to the lower end of the base 1. To solve the problem of reset failure, a reset mechanism 3 is set inside the internal switch 7.

[0024] Please refer to Figure 1 and Figure 2The installation mechanism 2 serves as a connecting bridge between the pull cord switch and the external mounting surface. The installation mechanism 2 includes a base plate 201 fixedly connected to the lower end of the base 1 and a mechanism block 204 for fixing to the external structure. The base plate 201, as an extension of the base 1, moves integrally with the base 1. The mechanism block 204 is pre-fixed in the installation position. The lower end face of the base plate 201 and the upper end face of the mechanism block 204 are in contact. The base plate 201 and the mechanism block 204 are initially positioned by rotating and engaging, and finally locked by bolts 210, thereby avoiding the inconvenience of continuous hand engagement during installation.

[0025] Please refer to Figure 3 and Figure 4 The reset mechanism 3 is concealed inside the built-in switch 7. The reset mechanism 3 includes a reset groove 301 opened inside the built-in switch 7. The reset groove 301 contains a drive component that can move vertically back and forth. The reset mechanism 3 directly acts on the button 5 through the upward pushing motion of the internal component. When the button 5 itself has insufficient rebound force, it provides forced reset power to ensure that the pull cord switch can return to its initial state. At the same time, the reset mechanism 3 prevents external impurities from entering through a multi-seal structure.

[0026] Please refer to Figure 2 The bottom plate 201 has guide grooves 202 on its left and right sides, which extend longitudinally along the bottom surface of the bottom plate 201 as guide channels. The upper end of the guide grooves 202 is connected to a rotating groove 203, which is circular or arc-shaped to accommodate rotating parts. The guide grooves 202 and the rotating grooves 203 together form the motion trajectory space of the T-shaped rod 207. The bottom of the bottom plate 201 is also equipped with a mechanism block 204. The upper middle part of the mechanism block 204 has position grooves 20 on its left and right sides. 5. Position slot 205 is a receiving cavity opened inside the mechanism block 204. A motor 206 is fixedly installed inside the position slot 205. The motor 206 provides rotational power as a drive source. A T-shaped rod 207 is fixedly connected to the output end of the motor 206. The T-shaped rod 207 has an inverted T-shaped structure. The T-shaped rod 207 includes a vertical connecting rod and a horizontal crossbar. The size of the horizontal crossbar of the T-shaped rod 207 is adapted to the diameter of the rotating groove 203, and the T-shaped rod 207 can slide and fit inside the guide groove 202.

[0027] Specifically, during installation, the mechanism block 204 is pre-fixed in the installation position. When the base plate 201 approaches the mechanism block 204 along with the base 1, the T-shaped rod 207 is aligned with the entrance of the guide groove 202 and slides upward along the guide groove 202. After the T-shaped rod 207 is fully inserted into the guide groove 202 and reaches the position of the rotating groove 203, the motor 206 is started. The motor 206 drives the T-shaped rod 207 to rotate a certain angle inside the rotating groove 203, so that the horizontal crossbar of the T-shaped rod 207 is stuck into the inner wall of the rotating groove 203 and cannot be vertically removed along the guide groove 202. This achieves the initial fixation between the base 1 and the mechanism block 204. This connection method, in which the motor 206 drives the T-shaped rod 207 to rotate and be stuck into the rotating groove 203, eliminates the need for the installer to constantly hold the base 1 with their hands, avoiding interference from hand clamping during installation and simplifying the installation process.

[0028] Please refer to Figure 1 and Figure 2 To further ensure the stability of the base 1 after long-term use, through holes 208 are provided at the four corners of the base plate 201. The through holes 208 are through holes that pass through the upper and lower surfaces of the base plate 201. Threaded holes 209 are provided at the four corners of the upper end of the mechanism block 204 corresponding to the positions of the through holes 208. The threaded holes 209 are blind holes or through holes with internal threads. After the T-shaped rod 207 is initially positioned, the through holes 208 and the threaded holes 209 are aligned. At this time, the bolt 210 is passed through the through holes 208 and inserted into the threaded holes 209. By rotating the bolt 210, the bolt 210 is threadedly connected and tightened with the threaded holes 209. The head of the bolt 210 presses against the upper surface of the base plate 201, thereby firmly locking the base plate 201 onto the mechanism block 204. This dual fixing method, which combines initial rotation and subsequent bolt 210 locking, ensures both the convenience of installation and the reliability of the connection, preventing the base 1 from falling off due to vibration.

[0029] As a preferred embodiment, to address the issue of button 5 failing to reset due to aging of the internal spring, please refer to... Figure 3 and Figure 4The reset mechanism 3 is configured as an active push-top structure. The reset groove 301 is located at the front and rear ends of the built-in switch 7. The reset groove 301 is a long, vertically extending cavity. A reset rod 303 is slidably connected inside the reset groove 301. The reset rod 303 can slide freely up and down along the reset groove 301. A position groove 304 is provided at the lower end of the reset rod 303. The position groove 304 serves as a connection interface for receiving driving force. A telescopic rod 302 is fixedly installed at the bottom of the reset groove 301. The telescopic rod 302 is an electric push rod or a miniature cylinder. The output end of the telescopic rod 302 extends upward and is fixedly connected inside the position groove 304. When the telescopic rod 302 starts to extend, it can drive the reset rod 303 to move upward in the reset groove 301. The upper end of the reset rod 303 directly abuts against the lower surface of the button 5. Through this rigid transmission, the reset mechanism 3 can provide a strong reset force when necessary, forcibly pushing the button 5 back to its initial position.

[0030] In another preferred embodiment, in order to improve the smoothness of the movement of the reset rod 303 and the reliability of the limiting position, a retaining ring 307 is fixedly connected to the lower outer end of the reset rod 303. The outer diameter of the retaining ring 307 is slightly larger than the diameter of the reset rod 303 and slides against the inner wall of the reset groove 301. The retaining ring 307 acts as a guide ring to prevent the reset rod 303 from tilting or getting stuck during the movement. At the same time, the retaining ring 307 can also act as a stroke limiter to prevent the reset rod 303 from coming out of the reset groove 301.

[0031] As another preferred embodiment, in order to prevent external dust or impurities from entering the interior of the reset mechanism 3 and damaging the telescopic rod 302, a rubber groove 305 is provided at the upper opening of the reset groove 301. The rubber groove 305 is an annular groove structure, and a rubber ring 306 is fixedly installed inside the rubber groove 305. The rubber ring 306 has elastic deformation capability, and the inner hole of the rubber ring 306 tightly covers the outer wall of the reset rod 303. The reset rod 303 passes through the rubber ring 306 and forms a dynamic sealing contact with the rubber ring 306. This sealing structure effectively isolates the external environment from the internal space of the reset groove 301 without hindering the normal up and down sliding of the reset rod 303, thus extending the service life of the reset mechanism 3.

[0032] As another preferred embodiment, in order to facilitate the operation of the pull rope, a buckle 6 is fixedly installed on the right end of the built-in switch 7. The buckle 6 is a sturdy metal ring structure, which is used to easily hook or tie the pull rope. By pulling the pull rope connected to the buckle 6, the electrical contacts inside the built-in switch 7 can be directly triggered to achieve the closing or opening function of the switch.

[0033] Working principle: When it is necessary to install the base 1 onto the corresponding structure, in order to avoid rigid fixation that makes replacement and maintenance impossible and cumbersome installation, the installation mechanism 2 installed at the lower end of the base 1 is activated. At this time, the outer cover 4 has been pre-installed on the upper end of the base 1, and the built-in switch 7 is installed on the right end of the base 1. The retaining ring 6 is installed on the right end of the built-in switch 7. In the installation mechanism 2, the base plate 201 is fixed to the lower end of the base 1, and the mechanism block 204 is pre-fixed on the mounting surface. When it is necessary to initially install the base 1, the T-shaped rod 207 is aligned with the lower part of the base plate 201. The guide grooves 202 on the left and right sides allow the T-shaped rod 207 to be guided along the guide grooves 202 and slide upward to the rotating groove 203 at the upper end of the guide grooves 202. At this time, the motor 206 located inside the slot 205 of the mechanism block 204 is started. The motor 206 drives the T-shaped rod 207 to rotate at a corresponding angle inside the rotating groove 203, so that the T-shaped rod 207 is stuck in the rotating groove 203 and cannot be directly removed, thus completing the purpose of the initial installation of the base 1 and achieving the effect of avoiding the cumbersome installation of the base 1 by hand. After the initial positioning is completed, when it is necessary to securely install the base 1, the through holes 208 at the four corners of the base plate 201 and the threaded holes 209 at the four corners of the upper end of the mechanism block 204 are precisely aligned. At this time, the bolts 210 are passed through the through holes 208 and screwed into the threaded holes 209 for threaded connection and fastening, thus achieving the purpose of securely installing the base 1 and avoiding the effect of the initial installation base 1 not being stable enough after long-term use and falling off. The installation mechanism 2 completes the purpose of installing the base 1 onto the corresponding structure through two steps, thus avoiding the effect of rigid fixation that cannot be replaced or maintained and the cumbersome installation. When button 5 needs to be reset, in order to prevent the spring inside button 5 from failing to reset after prolonged use, the reset mechanism 3 installed inside the built-in switch 7 is activated. When button 5 needs to be reset, the telescopic rod 302 located at the bottom of the reset groove 301 is activated. The output end of the telescopic rod 302 pushes upward, causing the reset rod 303 connected to the telescopic rod 302 through the position groove 2 304 to move upward along the reset groove 301. The upper end of the reset rod 303 lifts button 5 to reset button 5. The retaining ring 307 at the lower end of the reset rod 303 plays a guiding and limiting role in this process, thus completing the purpose of resetting button 5 and achieving the effect of preventing button 5 from failing to reset in time. When the reset rod 303 moves, in order to prevent external impurities from entering the interior of the reset mechanism 3, a rubber ring 306 is fixed inside the rubber groove 305 opened at the upper end of the reset groove 301. The rubber ring 306 is always tightly attached to the outer wall of the reset rod 303. Because the rubber ring 306 has sealing properties, it achieves the purpose of sealing the reset mechanism 3, and avoids impurities from entering the interior of the reset mechanism 3 and causing damage to the telescopic rod 302. The reset mechanism 3 completes the purpose of the reset button 5, and achieves the effect of preventing the spring inside the button 5 from failing to perform the reset function after long-term use.

Claims

1. A pull cord switch, comprising: The base (1), the outer cover (4) fixedly connected to the upper end of the base (1), and the built-in switch (7) fixedly installed on the right end of the base (1); The invention is characterized by further comprising an installation mechanism (2) disposed at the lower end of the base (1) and a reset mechanism (3) disposed inside the built-in switch (7). The installation mechanism (2) comprises a base plate (201) fixedly connected to the lower end of the base (1) and a mechanism block (204). A guide groove (202) is provided at the lower end of the base plate (201). A rotating groove (203) is provided at the upper end of the guide groove (202). A position groove (205) is provided at the upper end of the mechanism block (204). A motor (206) is fixedly installed inside the position groove (205). A T-shaped rod (207) is fixedly connected to the output end of the motor (206). The T-shaped rod (207) is slidably fitted inside the guide groove (202), and the T-shaped rod (207) is driven to rotate by the motor (206) and inserted into the rotating groove (203). The reset mechanism (3) includes a reset groove (301) opened inside the built-in switch (7). A telescopic rod (302) is fixedly installed inside the reset groove (301) and a reset rod (303) is slidably connected. A position groove (304) is opened at the lower end of the reset rod (303). The output end of the telescopic rod (302) is fixedly connected inside the position groove (304). A button (5) is movably installed at the upper end of the built-in switch (7). The upper end of the reset rod (303) abuts against the button (5).

2. A pull cord switch according to claim 1, characterized in that, The base plate (201) has through holes (208) at its four corners. The mechanism block (204) has threaded holes (209) at its four corners corresponding to the through holes (208). Bolts (210) are inserted into the through holes (208) and the bolts (210) are threaded into the threaded holes (209).

3. A pull cord switch according to claim 1, characterized in that, The upper end of the reset groove (301) is provided with a rubber groove (305), and a rubber ring (306) is fixedly installed inside the rubber groove (305). The reset rod (303) passes through the rubber ring (306) and is in sealed contact with the rubber ring (306).

4. A pull-cord switch according to claim 1, characterized in that, A retaining ring (307) is fixedly connected to the lower outer end of the reset rod (303), and the outer wall of the retaining ring (307) slides against the inner wall of the reset groove (301).

5. A pull-cord switch according to claim 1, characterized in that, The reset groove (301) is located at the front and rear ends inside the built-in switch (7), and the reset rod (303) moves vertically along the length of the reset groove (301).

6. A pull cord switch according to claim 1, characterized in that, The guide groove (202) is located on the left and right sides of the lower end of the base plate (201), and the position groove (205) is located on the left and right sides of the upper middle part of the mechanism block (204).

7. A pull cord switch according to claim 1, characterized in that, A retaining ring (6) is fixedly installed on the right end of the built-in switch (7).

8. A pull cord switch according to claim 1, characterized in that, The upper end face of the mechanism block (204) is in contact with the lower end face of the base plate (201), and the telescopic rod (302) is vertically fixed to the bottom of the reset groove (301).

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