Precision adjustable compression spring assembly for circuit breakers

Abstract

A compression spring assembly (300) and a circuit breaker (600) equipped with such an assembly are disclosed. The compression spring assembly comprises a compression spring (302A) having a first end (302AA) and a second end (302AB), a nut and bolt assembly (304) attached to the first end (302AA) of the compression spring (302A). The bolt (304B) is coupled with the nut (304A) via a pair of complementary screw threads (402), allowing the nut (304A) to move along the length of the bolt (304B) upon rotation. By allowing controlled rotation of the nut (304A) relative to the bolt (304B), an adjustment of a spring length of the compression spring (302A) is facilitated based on user preference. The circuit breaker (600) comprises a fixed contact (604) and a movable contact (606) mechanically coupled with the compression spring assembly (300).

Description

Background

[0001] The invention pertains to a compression spring assembly. More particularly, the invention is associated with Precision Adjustable Compression Spring Assembly for Circuit Breakers

[0002] In the realm of electrical engineering, vacuum interrupters are critical components of circuit breakers, particularly in high-voltage applications. A vacuum interrupter works by extinguishing the arc that forms when a circuit breaker interrupts a high-voltage circuit. To function effectively, the vacuum interrupter requires a precise amount of pressure, which is typically provided by a compression spring. The tension in the compression spring directly determines the pressure applied to the vacuum interrupter. Thus, a length of the compression spring has to be fine-tuned for optimal performance. Current methods for adjusting the tension and length of the compression spring in vacuum interrupters present several challenges.

[0003] FIG 1 (prior art) illustrates a perspective view of a compression spring assembly 100 used in a vacuum interrupter of a circuit breaker, in accordance with prior art. The compression spring assembly 100 comprises a compression spring 102A which is fixed at one anchor point 102B. The compression spring 102A has a guide rod 102C passing through a Z-axis of the compression spring 102A, and a movable end 102D. The Z-axis is an axis which is parallel to the guide rod 102C and perpendicular to a central axis of the anchor point 102B. In other words, the Z-axis represents a longitudinal direction along which the compression spring 102A extends and contracts. The Z axis is critical for the operation of the spring as it defines the direction in which the spring force is applied and resisted. The movable end 102D is enabled to be pushed based on a pressure from the compression spring 102A. To adjust the pressure of the compression spring 102A, the compression spring 102A must be compressed. In other words, the length of the compression spring 102A must be adjusted.

[0004] In accordance with the prior art illustrated in FIG. 1, compression of the compression spring 102A is adjusted by first dismantling the compression spring assembly 100 entirely and then adding a washer 104 between the compression spring 102A and the anchor point 102B. The washer 104 typically has a minimum thickness of 1 mm. Thus, the length of the compression spring is adjustable in 1 mm gradients. Such lack of precision can be inadequate for applications that require fine-tuned pressure settings. Furthermore, a process of dismantling the compression spring assembly 100 is a tedious process. Therefore, a conventional method of using the washer 104 for adjusting the spring length poses significant limitations in terms of both efficiency and precision.

[0005] FIG 2 (prior art) illustrates a perspective view of a compression spring assembly 200 used in a vacuum interrupter of a circuit breaker, in accordance with prior art. The compression spring assembly 200 comprises a compression spring 202A which had a first end which is is fixed at one anchor point 202B, and a guide rod 202C passes through a Z-axis of the compression spring 202A. The compression spring 202A further comprises a second end which is communicatively coupled to a movable end 202D. The movable end 202D is enabled to be pushed based on a pressure from the compression spring 202A. The movable end 202D is further coupled to a wheel 204 which has an irregular radial length and spokes.

[0006] To adjust the pressure of the compression spring 102A, a length of the compression spring 102A must be adjusted. An adjustment of the length of the compressions spring 102A is achieved by rotating the wheel 104. As the wheel 104 has an irregular radial length, rotating the wheel 104 changes a compression of the compression spring 202A based on a varying radius of the wheel 204. Although use of the wheel 204 offers some degree of adjustability, the wheel 204 can be cumbersome to use. The irregular radial length of the wheel 104 prevents precise control of compression of the compression spring 202A. A lack of precision is problematic in high-precision applications, such as vacuum interrupters in circuit breakers, where fine-tuning the compression of the compression spring is crucial for optimal performance of the vacuum interrupter. As a result, the existing system may not provide the level of control needed for such sensitive applications.

[0007] In light of the above, there exists a need for Precision Adjustable Compression Spring Assembly for Circuit Breakers.

[0008] Accordingly, it is an object of the invention to overcome drawbacks of state of the art. The object of the invention is achieved by independent claim 1, independent claim 7, and all the corresponding dependent claims thereof.

[0009] In an aspect, a compression spring assembly used in a vacuum interrupter of a circuit breaker is disclosed. The compression spring assembly comprises a compression spring which has a first end fixed to an anchor point. The compression spring further has a guide rod passing through a Z-axis of the compression spring. A second end of the compression spring is mechanically coupled to a movable end of the compression spring assembly. The movable end can be pushed based on the pressure from the compression spring. To adjust the pressure of the compression spring, the compression spring must be compressed. In other words, the length of the compression spring must be adjusted. The compression spring assembly further comprises a nut and bolt assembly and a distance washer locking plate. The nut and bolt assembly and the distance washer locking plate are fixed between the compression spring and the anchor point.

[0010] The nut and bolt assembly comprises a nut and a bolt. The bolt in the nut and bolt assembly is coupled with the nut via a pair of complementary screw threads. Thus, the nut can be rotated in a Z axis of the nut to move the nut along a length of the bolt. By moving the nut along the length of the bolt, a distance between the anchor point and the first end of the compression spring can be adjusted. The movement of the nut along the length of the bolt is adjustable with precision, based on a pitch of the complementary screw threads. The pitch, which is a distance between adjacent threads in the complementary screw threads, helps in providing fineness in the movement of the nut. A finer pitch means that even a small rotation of the nut results in a slight change in the length between the nut and the bolt. Thus, the distance between the anchor point and the first end of the compression spring can be adjusted with precision. A rotation of the nut in a first direction decreases the length between the nut and the bolt, thereby compressing the compression spring and increasing the tension of the compression spring. Conversely, a rotation of the nut in a second direction increases the length between the nut and the bolt, thereby extending the compression spring and reducing the tension.

[0011] By adjusting the distance between the first end and the anchor point, the compression of the compression spring is adjusted. Thus, the tension of the compression spring is adjusted precisely. The nut and bolt assembly enables precise fine-tuning of the tension in the compression spring by allowing controlled rotation of the nut relative to the bolt, thereby facilitating an adjustment of the spring length of the compression spring based on user preference. In other words, the nut of the nut and bolt assembly, when selectively rotated relative to the bolt, causes a change in a compressed spring length of the compression spring thereby allowing precise fine-tuning of a tensile force / tension in the compression spring. The nut further comprises a flange with a hole defined on the flange. Furthermore, the nut is designed with a knurled surface to provide grip for precise manual rotation by a user, improving the usability of the compression spring assembly. The bolt is made of stainless steel, ensuring durability and resistance to corrosion, which is particularly important for the reliability of the compression spring assembly. Advantageously, the nut and bolt enable the performance of easy and accurate adjustments to the compression spring assembly.

[0012] The distance washer locking plate comprises a plurality of protrusions. Each protrusion of the plurality of protrusions is receivable by the hole defined on the nut. A selective alignment of the hole with each protrusion of the plurality of protrusions, causes the compression spring to have a specific compression spring length and a specific tension level which is specific to the protrusion. Furthermore, the distance washer locking plate includes a plurality of indicators markings to indicate the current tension level of the compression spring, which provides a visual cue for precise adjustments. Each indicator marking of the plurality of indicator markings indicate a current tension level of the compression spring, such that each indicator marking is indicative of the hole locking into a specific protrusion of the plurality of protrusions. The hole and a protrusion of the plurality of protrusions interlock with each other to form a locking mechanism. In other words, the distance washer locking plate is equipped with the locking mechanism. The locking mechanism is configured to lock and maintain a distance between the nut and the bolt when the nut is stationary relative to the bolt. In other words, each protrusion of the plurality of protrusions is configured to lock into the hole, thereby restricting the rotation of the nut due to vibration. Thus, the tension level of the compression spring remains stable. In one example, at least one protrusion of the plurality of protrusions is a threaded protrusion.

[0013] In further aspect, a circuit breaker is disclosed. The circuit breaker is an electrical device configured to protect an electrical circuit from damage caused by overcurrent, overload, or short circuit. The circuit breaker is configured to automatically interrupt the flow of electricity when a fault is detected, preventing potential hazards such as electrical fires or equipment damage. The circuit breaker comprises a vacuum interrupter which comprises a fixed contact and a movable contact. The circuit breaker further comprises a drive box which is an integral part of the circuit breaker. The drive box is mechanically coupled to the movable contact of the vacuum interrupter via the compression spring assembly. The vacuum interrupter is a critical component in electrical power distribution systems, designed for rapid and reliable interruption of current flow in high-voltage circuits. The vacuum interrupter operates within a sealed vacuum chamber, which provides an optimal environment for extinguishing electrical arcs that occur when the circuit is broken. The vacuum interrupter primarily consists of two key components: the fixed contact and the movable contact. The fixed contact remains stationary within the sealed vacuum chamber, serving as one terminal of an electrical circuit. The movable contact, on the other hand, can be mechanically driven to either make or break the connection with the fixed contact. When the movable contact is engaged with the fixed contact, the electrical circuit is complete, allowing current to flow uninterrupted. Conversely, when the movable contact is pulled away from the fixed contact, the circuit is broken, and an arc forms between the fixed contact and the movable contact. In the sealed vacuum chamber, the arc is quickly extinguished due to the absence of ionizable gas, which significantly reduces the arc's duration and energy. Rapid suppression of the arc is essential for protecting electrical equipment and ensuring the safety and reliability of the power distribution system. The drive box is a mechanical device that provides the necessary force to activate the vacuum interrupter. In one example, the drive box houses a motor or actuator that drives a mechanism to move the movable contact towards or away from the fixed contact. In another example, the drive box includes a plurality of links, springs, motors, and the like to provide the necessary driving force such that the movable contact is brought into contact with and separated from the fixed contact member of the vacuum interrupter. In other words, a power transfer mechanism is provided within the drive box for transferring a driving force of an operating mechanism to the movable contact. The driving force is crucial for opening and closing the electrical circuit within the vacuum interrupter. When the drive box activates the vacuum interrupter, the drive box compresses or decompresses the compression spring assembly, and the compression spring assembly in turn adjusts the position of the movable contact.

[0014] For optimal performance of the circuit breaker, the compression spring assembly must deliver an optimal amount of force on the movable contact. If the amount of force delivered by the compression spring assembly is greater than a first threshold, then the force causes the movable contact to press excessively firmly against the fixed contact. The force could lead to increased wear and tear on the movable contact, reducing its lifespan and potentially causing mechanical failure of the vacuum interrupter. Additionally, excessive compression of the movable contact to the fixed contact could delay the interruption process and compromise the protection offered by the circuit breaker. Conversely, if the amount of force delivered by the compression spring assembly is less than a second threshold, a reliable connection between the movable contact and the fixed contact may not be formed. Thus, insufficient force can result in poor electrical contact, leading to higher resistance, overheating, and potential arcing even when the electrical circuit is supposed to be closed. Such conditions can cause significant damage to the electrical system and reduce the effectiveness of the circuit breaker.

[0015] Since the force delivered by the compression spring assembly is dependent on the tension in the compression spring, precise adjustment of the tension of the compression spring is essential. The nut and bolt assembly ensures that a user is enabled to precisely control the tension in the compression spring. Thus, the compression spring assembly is enabled to deliver an optimal amount of force to the movable contact. Furthermore, the movable contact engages and disengages with the fixed contact with the optimal force, balancing the need for reliable electrical contact with minimal wear and tear. Thus, precise adjustment of the tension in the compression spring enables the vacuum interrupter to operate efficiently, providing rapid and reliable interruption of current flow during fault conditions. It also ensures that the circuit breaker can handle a wide range of electrical loads without compromising its performance or longevity, thereby enhancing the overall safety and reliability of the power distribution system. In other words, the compression spring is configured to apply pressure on the movable contact to press the movable contact against the fixed contact. Furthermore, the nut and bolt assembly enables precise fine-tuning of the tension in the compression spring by allowing controlled rotation of the nut relative to the bolt, thereby facilitating an adjustment of the pressure applied to the movable contact based on user preference.

[0016] The above mentioned and other features of the invention will now be addressed with reference to the accompanying drawings of the present invention. The illustrated embodiments are intended to illustrate, but not limit the invention.

[0017] The present invention is further described hereinafter with reference to illustrated embodiments shown in the accompanying drawings, in which: FIG 1 illustrates a perspective view of a first compression spring assembly, in accordance with prior art; FIG 2 illustrates a perspective view of a second compression spring assembly, in accordance with prior art FIG 3Aillustrates a perspective view of a compression spring assembly, in accordance with an embodiment of the present invention; FIG 3Billustrates a cross-sectional view of the compression spring assembly, in accordance with an embodiment of the present invention; FIG 4 illustrates a perspective view of a nut and a bolt, in accordance with an embodiment of the present invention; FIG 5 illustrates a perspective view of a distance washer plate, in accordance with an embodiment of the present invention; and FIG 6 illustrates schematic diagram of a circuit breaker, in accordance with an embodiment of the present invention.

[0018] Various embodiments are described with reference to the drawings, wherein like reference numerals are used to refer like elements throughout. In the following description, for the purpose of explanation, numerous specific details are set forth in order to provide thorough understanding of one or more embodiments. It may be evident that such embodiments may be practiced without these specific details.

[0019] FIG 3A illustrates a perspective view of a compression spring assembly 300 used in a vacuum interrupter of a circuit breaker, in accordance with the present invention. The compression spring assembly 300 comprises a compression spring 302A which has a first end 302AA which is mechanically coupled and fixed to an anchor point 302B. The compression spring 302A further has a guide rod 302C passing through a Z-axis of the compression spring 302A. A second end 302AB of the compression spring 302A is mechanically coupled to a movable end 302D of the compression spring assembly 300. The movable end 302D is configured to be pushed based on a pressure from the compression spring 302A. To adjust the pressure of the compression spring 302A, the compression spring 302A must be compressed. In other words, the length of the compression spring 302A must be adjusted. The compression spring assembly further comprises a nut and bolt assembly 304 and a distance washer locking plate 206. The nut and bolt assembly 304 and the distance washer locking plate 206 is fixed between the compression spring 302A and the anchor point 302B.

[0020] Referring to FIG. 3B, which shows a cross sectional view of the compression spring assembly 300, the nut and bolt assembly 304 (as shown in FIG. 3A) comprises a nut 304A and a bolt 304B. The bolt 304B in the nut and bolt assembly 304 (as shown in FIG. 4) is coupled with the nut 304A via a pair of complementary screw threads 402 (as shown in FIG. 4). Thus, the nut 304A can be rotated in a Z axis of the nut 304A to move the nut 304A along a length of the bolt 304B.

[0021] Referring back to FIG. 3A, by moving the nut 304A along the length of the bolt 304B, a distance between the anchor point 302B and the first end of the compression spring 302A can be adjusted. The movement of the nut 304A along the length of the bolt 304B be adjustable with precision, based on a pitch of the pair of complementary screw threads 402. The pitch, which is a distance between adjacent threads in the pair of complementary screw threads 402, helps in providing fineness in a movement of the nut 304A. A finer pitch can ensure that a rotation of the nut 304A results in a small change in the length between the nut 304A and the bolt 304B. Thus, the distance between the anchor point 302B and the first end of the compression spring 302A can be adjusted with precision. A rotation of the nut 304A in a first direction decreases the length between the nut 304A and the bolt 304B, thereby compressing the compression spring 302A and increasing a tension of the compression spring 302A. Conversely, a rotation of the nut 304A in a second direction increases the length between the nut 304A and the bolt 304B, thereby extending the compression spring 302A and reducing the tension.

[0022] By adjusting the distance between the first end and the anchor point 302B, a compression of the compression spring 302A is adjusted. Thus, the tension of the compression spring 302A is adjusted precisely. Thus, the nut and bolt assembly 304 enables precise fine-tuning of the tension in the compression spring 302A by allowing controlled rotation of the nut 304A relative to the bolt 304B, thereby facilitating an adjustment of a spring length of the compression spring 302A based on a user preference. In other words, the nut 304A of the nut and bolt assembly 304, when selectively rotated relative to the bolt 304B causes a change in a compressed spring length of the compression spring 302A thereby allowing precise fine-tuning of a tensile force / tension in the compression spring 302A.

[0023] Referring to FIG. 4, the nut 304A further comprises a flange 404 with a hole 406 defined on the flange 404. Furthermore, the nut 304A is designed with a knurled surface 408 to provide a grip to facilitate precise manual rotation by a user, improving the usability of the compression spring assembly 300. The bolt 304B is made of stainless steel, ensuring durability and resistance to corrosion, which is particularly important for reliability of the compression spring assembly 300. Advantageously, the nut 304A and the bolt 304B enables performance of easy and accurate adjustments to the compression spring assembly 300.

[0024] Referring to FIG. 5, the distance washer locking plate 306 comprises a plurality of protrusions 502. Each protrusion of the plurality of protrusions 502 is receivable by the hole 406 defined on the nut 304A. Furthermore, the distance washer locking plate 306 includes a plurality of indicator markings 504 to indicate the current tension level of the compression spring 302A, which provides a visual cue for precise adjustments. Each indicator marking of the plurality of indicator markings 504 is indicative of the hole (406) locking into a specific protrusion of the plurality of protrusions (502). For example, the plurality of indicator markings 504 consists of a series of calibrated lines or numbers on the distance washer locking plate 306, each corresponding to a specific tension level of the compression spring 302A. As the nut 304A is rotated along the bolt 304B, the movement of the nut 304A changes a compression of the compression spring 302A, and a position of the nut 304A relative to the plurality of indicator markings 504 changes as well. Each indicator marking is indicative of the hole (406) locking into a specific protrusion of the plurality of protrusions (502). By observing the alignment of the nut 304A with the calibrated lines or numbers, a user is enabled to easily determine a current tension level of the compression spring 302A. A selective alignment of the hole 406 with each protrusion of the plurality of protrusions 502, causes the compression spring 302A to have a specific compression spring length and a specific tension level which is specific to the protrusion.

[0025] Referring to back to FIG. 3B, the hole 406 (as shown in FIG. 4) and a protrusion of the plurality of protrusions 502 (as shown in FIG. 5) interlock with each other to form a locking mechanism 308. In other words, the distance washer locking plate 306 is equipped with the locking mechanism 308. The locking mechanism 308 is configured to lock and maintain a distance between the nut 304A and the bolt 304B when the nut 304A is stationary relative to the bolt 304B. In other words, each protrusion of the plurality of protrusions 502 is configured to lock into the hole 406, thereby restricting a rotation of the nut 304A due to vibration. In the presence of vibration, the plurality of protrusions 504 and the hole 406 create a mechanical resistance that counteracts forces attempting to rotate the nut 304A. Thus, the nut 304A remains stationary relative to the bolt 304B, thereby maintaining a set tension level of the compression spring 302A. Thus, a tension level of the compression spring 302A remains stable. In one example, at least one protrusion of the plurality of protrusions 502 (as shown in FIG. 5) is a threaded protrusion. The threaded protrusion adds an additional layer of security by further engaging with the flange 404 (as shown in FIG. 4), thereby enhancing an effectiveness of the locking mechanism 308 in preventing rotation due to vibration. When the threaded protrusion is aligned with the hole 406, the threaded protrusion can be screwed into the hole 406 by rotating the threaded protrusion clockwise. Thus, a secure mechanical lock, that prevents any rotational movement of the nut 304A relative to the bolt 304B due to vibrations, is created or other external forces. To disengage the lock, the user can rotate the threaded protrusion counterclockwise, thereby unscrewing it from the hole 406. The threaded design of the protrusion ensures that the locking mechanism is robust and resistant to unintentional shifts, thereby maintaining the set tension level of the compression spring (302A).

[0026] Referring to FIG. 6, a circuit breaker 600 is illustrated. The circuit breaker 600 is an electrical device configured to protect an electrical circuit from damage caused by overcurrent, overload, or short circuit. The circuit breaker 600 is configured to automatically interrupt a flow of electricity when a fault is detected, preventing potential hazards such as electrical fires or equipment damage. The circuit breaker 600 comprises a vacuum interrupter 602 which comprises a fixed contact 604 and a movable contact 606. The circuit breaker 600 further comprises a drive box 608 which is an integral part of the circuit breaker 600. The drive box 608 is mechanically coupled to the movable contact of the vacuum interrupter 602 via the compression spring assembly 300.

[0027] The vacuum interrupter 602 is a critical component in electrical power distribution systems, designed for rapid and reliable interruption of current flow in high-voltage circuits. The vacuum interrupter 602 operates within a sealed vacuum chamber, which provides an optimal environment for extinguishing electrical arcs that occur when a high voltage electrical circuit is broken. The vacuum interrupter 602 primarily consists of two components: the fixed contact 604 and the movable contact 606. The fixed contact 604 remains stationary within the sealed vacuum chamber, serving as one terminal of an electrical circuit. The movable contact 606, on the other hand, is configured to be mechanically driven to either make or break a connection with the fixed contact 604. When the movable contact 606 is engaged with the fixed contact 604, the electrical circuit is complete, allowing current to flow uninterrupted. Conversely, when the movable contact 606 is pulled away from the fixed contact 604, the electrical circuit is broken, and an arc forms between the fixed contact 604 and the movable contact 606. In the sealed vacuum chamber, the arc is quickly extinguished due to the absence of ionizable gas, which significantly reduces a duration and energy of the arc. A rapid suppression of the arc is essential for protecting electrical equipment and ensuring the safety and reliability of the power distribution system.

[0028] The drive box 608 is a mechanical device which is configured to provide a force to activate the vacuum interrupter 602. In one example, the drive box 608 houses a motor or actuator that drives a mechanism to move the movable contact 606 towards or away from the fixed contact 604. In another example, the drive box 608 includes a plurality of links, springs and the like to provide a necessary driving force such that the movable contact 606 is brought into contact with and separated from the fixed contact 604 of the vacuum interrupter 602. In other words, a power transfer mechanism is provided within the drive box 608 for transferring a driving force of an operating mechanism to the movable contact 606. The driving force is crucial for opening and closing the electrical circuit within the vacuum interrupter 602. When the drive box 608 activates the vacuum interrupter 602, the drive box 608 compresses or decompresses the compression spring assembly 300, and the compression spring assembly 300, in turn, adjusts the position of the movable contact 606.

[0029] For optimal performance of the circuit breaker 600, the compression spring assembly 300 must deliver an optimal amount of force on the movable contact 606. If an amount of a force delivered by the compression spring assembly 300 is greater than a first threshold, then the force causes the movable contact 606 to press excessively firmly against the fixed contact 604. The force could lead to increased wear and tear on the movable contact 606, reducing a lifespan and potentially causing mechanical failure of the vacuum interrupter 602. Additionally, excessive compression of the movable contact 606 to the fixed contact 604 could delay an interruption process and compromise a protection offered by the circuit breaker 600.

[0030] Conversely, if an amount of a force delivered by the compression spring assembly 300 is lesser than a second threshold, a reliable connection between the movable contact 606 and the fixed contact 604 may not be formed. Thus insufficient force can result in poor electrical contact, leading to higher resistance, overheating, and potential arcing even when the electrical circuit is supposed to be closed. Such conditions can cause significant damage to the electrical system and reduce the effectiveness of the circuit breaker 600.

[0031] Since the force delivered by the compression spring assembly 300 is dependent on a tension in the compression spring 302A (as shown in FIG. 3A), precise adjustment of tension of the compression spring 302A (as shown in FIG. 3A) is crucial. The nut and bolt assembly 304 (as shown in FIG. 3A) ensures that a user is enabled to precisely control the tension in the compression spring 302A. Thus, the compression spring assembly 300 is enabled to deliver an optimal amount of force to the movable contact 606. Furthermore, the movable contact 606 engages and disengages with the fixed contact 604 with the optimal force, balancing a need for reliable electrical contact with minimal wear and tear. Thus, precise adjustment of the tension in the compression spring 302A (as shown in FIG. 3A) enables the vacuum interrupter 602 to operate efficiently, providing rapid and reliable interruption of current flow during fault conditions. It also ensures that the circuit breaker can handle a wide range of electrical loads without compromising its performance or longevity, thereby enhancing the overall safety and reliability of the power distribution system.

[0032] In other words, the compression spring 302A (as shown in FIG. 3A) is configured to apply a pressure on the movable contact 606 to press the movable contact 606 against the fixed contact 604. Furthermore, the nut and bolt assembly 304 enables precise fine-tuning of the tension in the compression spring 302A by allowing controlled rotation of the nut 304A (as shown in FIG. 3B) relative to the bolt 304B (as shown in FIG. 3B), thereby facilitating an adjustment of a pressure applied to the movable contact 606 based on user preference.

[0033] The circuit breaker 600 is designed to allow precise control over the position of the movable contact 606 relative to the fixed contact through the use of the nut and bolt assembly 304. Specifically, the nut 304A is configured such that its rotation in a first direction decreases the distance between the nut 304A and the bolt 304B. This action compresses the compression spring 302A, resulting in the movement of the movable contact 606 away from the fixed contact 604. Conversely, rotating the nut 304A in a second direction increases the distance between the nut 304A and the bolt 304B. This extends the compression spring 302A, causing the movable contact 606 to move towards the fixed contact 604. This bidirectional control mechanism ensures that the compression spring 302A can be precisely adjusted to apply the optimal amount of pressure necessary for reliable operation of the circuit breaker 600.

[0034] To maintain the stability and precision of the compression spring assembly 300, the nut 304A is equipped with the flange 404 that features the hole 406. The distance washer locking plate 306 includes the plurality of protrusions 502 designed to lock into the hole 406. This locking mechanism restricts the rotation of the nut 304A due to vibrations or other external forces, thereby maintaining a set distance between the nut 304A and the bolt 304B. This ensures that the compressed spring length of the compression spring (302A) remains consistent, thereby stabilizing the pressure applied by the compression spring 302A on the movable contact 606. This locking mechanism is crucial for preventing inadvertent adjustments that could compromise the performance of the circuit breaker 600.

[0035] The distance washer locking plate 306 is further enhanced with the plurality of indicator markings 504. The plurality of indicator markings 504 serve as visual cues that indicate the current tension level of the compression spring 302A. Each indicator marking corresponds to a specific protrusion of the plurality of protrusions 502 and thus to a specific tension level. By observing the plurality of indicator markings, a user can easily determine the current tension setting and make precise adjustments as needed. Thus usability and precision of the compression spring assembly 300 is enhanced, allowing for fine-tuned control of the pressure applied by the compression spring (302A) on the movable contact (606).

[0036] While the present invention has been described in detail with reference to certain embodiments, it should be appreciated that the present invention is not limited to those embodiments. In view of the present disclosure, many modifications and variations would be present themselves, to those skilled in the art without departing from the scope of the various embodiments of the present invention, as described herein. The scope of the present invention is, therefore, indicated by the following claims rather than by the foregoing description. All changes, modifications, and variations coming within the meaning and range of equivalency of the claims are to be considered within their scope.List of Reference Numerals

[0037] 1. 100 - Compression Spring Assembly (Prior Art, FIG 1) 2. 102A - Compression Spring (Prior Art, FIG 1) 3. 102B - Anchor Point (Prior Art, FIG 1) 4. 102C - Guide Rod (Prior Art, FIG 1) 5. 102D - Movable End (Prior Art, FIG 1) 6. 104 - Washer (Prior Art, FIG 1) 7. 200 - Compression Spring Assembly (Prior Art, FIG 2) 8. 202A - Compression Spring (Prior Art, FIG 2) 9. 202B - Anchor Point (Prior Art, FIG 2) 10. 202C - Guide Rod (Prior Art, FIG 2) 11. 202D - Movable End (Prior Art, FIG 2) 12. 204 - Wheel (Prior Art, FIG 2) 13. 300 - Compression Spring Assembly (FIG 3A, Present Invention) 14. 302A - Compression Spring (FIG 3A, Present Invention) 15. 302AA - First End of Compression Spring (FIG 3A, Present Invention) 16. 302AB - Second End of Compression Spring (FIG 3A, Present Invention) 17. 302B - Anchor Point (FIG 3A, Present Invention) 18. 302C - Guide Rod (FIG 3A, Present Invention) 19. 302D - Movable End (FIG 3A, Present Invention) 20. 304 - Nut and Bolt Assembly (FIG 3A, Present Invention) 21. 304A - Nut (FIG 3A, Present Invention) 22. 304B - Bolt (FIG 3A, Present Invention) 23. 306 - Distance Washer Locking Plate (FIG 3A, Present Invention) 24. 308 - Locking Mechanism (FIG 3A, Present Invention) 25. 402 - Complementary Screw Threads (FIG 4, Present Invention) 26. 404 - Flange (FIG 4, Present Invention) 27. 406 - Hole (FIG 4, Present Invention) 28. 408 - Knurled Surface (FIG 4, Present Invention) 29. 502 - Plurality of Protrusions (FIG 5, Present Invention) 30. 504 - Plurality of Indicator Markings (FIG 5, Present Invention) 31. 600 - Circuit Breaker (FIG 6, Present Invention) 32. 602 - Vacuum Interrupter (FIG 6, Present Invention) 33. 604 - Fixed Contact (FIG 6, Present Invention) 34. 606 - Movable Contact (FIG 6, Present Invention) 35. 608 - Drive Box (FIG 6, Present Invention)

Claims

1. A compression spring assembly (300) comprising: a compression spring (302A) having a first end (302AA) and a second end (302AB); a nut and bolt assembly (304) attached to the first end (302AA) of the compression spring (302A), wherein the bolt (304B) is coupled with the nut (304A) via a pair of complementary screw threads (402), allowing the nut (304A) to move along the length of the bolt (304B) upon rotation of the nut (304A); and a distance washer locking plate (306) disposed against the nut and bolt assembly (304), equipped with a locking mechanism (308) that locks and maintains a distance between the nut (304A) and the bolt (304B) when the nut (304A) is stationary relative to the bolt (304B), wherein the nut (304A) of the nut and bolt assembly (304) when selectively rotated relative to the bolt (304B) causes a change in a compressed spring length of the compression spring (302A) thereby allowing precise fine-tuning of a tensile force / tension in the compression spring (302A).

2. The compression spring assembly (300) of claim 1 wherein rotation of the nut (304A) in a first direction decreases the distance between the nut (304A) and the bolt (304B), thereby compressing the compression spring (302A), and rotation of the nut (304A) in a second direction increases the distance between the nut (304A) and the bolt (304B), thereby extending the compression spring (302A).

3. The compression spring assembly (300) of any of claims 1 and 2, wherein the nut (304A) further comprises a flange (404), wherein a hole (406) is defined on the flange (404); and the distance washer locking plate (306) includes a plurality of protrusions (502) configured to lock into the hole (406), thereby restricting the rotation of the nut (304A) due to vibration.

4. The compression spring assembly (300) of claim 1, wherein a selective alignment of the hole (406) with each protrusion of the plurality of protrusions (502), causes the compression spring (302A) to have a specific compression spring length and a specific tension level which is specific to the protrusion.

5. The compression spring assembly (300) of claim 1, wherein the distance washer locking plate (306) comprises a plurality of indicator markings (504), and each indicator marking of the plurality of indicator markings indicate a current tension level of the compression spring (302A), such that each indicator marking is indicative of the hole (406) locking into a specific protrusion of the plurality of protrusions (502).

6. The compression spring assembly (300) of claim 1, wherein the nut (304A) includes a knurled surface (408) to provide grip for precise manual rotation of the nut (304A) by a user.

7. The compression spring assembly (300) of claim 1, wherein the bolt (304B) is made of at least stainless steel.

8. A circuit breaker (600) comprising: a fixed contact (604); and a movable contact (606) mechanically coupled with a compression spring assembly (300) according to claims 1 to 7, wherein the compression spring (302A) is configured to apply a pressure on the movable contact (606) to press the movable contact (606) against the fixed contact (604); and wherein the nut (304A), of the nut and bolt assembly (304), when selectively rotated relative to the bolt (304B), causes a change in a compressed spring length of the compression spring (302A) thereby allowing precise fine-tuning of the pressure applied by the compression spring (302) on the movable contact (606).

9. The circuit breaker (600) of claim 7, wherein a rotation of the nut (304A) in a first direction decreases the distance between the nut (304A) and the bolt (304B), thereby compressing the spring (302A) and causing movement of the moveable contact (606) away from the fixed contact (604), and a rotation of the nut (304A) in a second direction increases the distance between the nut (304A) and the bolt (304B), thereby extending the compression spring (302A) and causing movement of the moveable contact (606) towards the fixed contact (604).

10. The circuit breaker (600) of any of claims 7 and 8, wherein the nut (304A) further comprises a flange (404), wherein a hole (406) is defined on the flange (404), and the distance washer locking plate (306) includes a plurality of protrusions (502) configured to: lock into the hole (406), and restrict the rotation of the nut (304A) due to vibration, thereby: restricting variation in the compressed spring length of the compression spring (302A), and restricting variations in the pressure applied by the compression spring (302A) on the moveable contact (606).

11. The circuit breaker (600) of claim 10, wherein the distance washer locking plate (306) comprises a plurality of indicator markings (504), and each indicator marking of the plurality of indicator markings indicate a current tension level of the compression spring (302A), such that each indicator marking is indicative of the hole (406) locking into a specific protrusion of the plurality of protrusions (502).

12. The circuit breaker (600) of any of claims 7, 8, 9, and 10, wherein the nut (304A) includes a knurled surface (408) to provide grip for precise manual rotation of the nut (304A) by a user, and thereby allowing precise fine-tuning of the pressure applied by the compression spring (302) on the movable contact (606).

13. The circuit breaker (600) of any of claims 7, 8, 9, and 10, wherein the bolt (304B) is made of at least stainless steel.

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