An adjustable force-assist device for a circuit breaker manual operating mechanism

Abstract

The utility model belongs to the field of drawer cabinet, concretely relates to an adjustable power assisting device for circuit breaker manual operating mechanism, including square shaft, support plate, fixed base, adjusting mechanism, torsional spring, torsional spring first end is opposite with support plate, second end is connected with fixed base through adjusting mechanism, adjusting mechanism can realize the step fixing and release of the circumferential angle between torsional spring second end and fixed base, can adjust the initial pre -tightening force of torsional spring acting on square shaft through the release and change of the circumferential angle, the adjustable power assisting device can effectively solve the problem that square shaft cannot rotate to the tripping open position due to the insufficient circuit breaker tripping opening force, when the circuit breaker tripping open, the release ability of torsional spring, the fixed base and square shaft are driven to rotate to the open direction through adjusting mechanism by torsional spring, handle acts with square shaft and rotates to the tripping open position, thereby the operator outside the cabinet can know the working state of circuit breaker, effectively avoid misoperation.

Description

Technical Field

[0001] This utility model belongs to the technical field of circuit breaker operating mechanisms, specifically relating to an adjustable assist device for the manual operating mechanism of a circuit breaker. Background Technology

[0002] When molded case circuit breakers are used in drawer cabinets, the circuit breaker is operated manually from outside the drawer cabinet door. This is especially true for circuit breakers with high current frame ratings. On the one hand, the operation is quick, saving the time of opening the cabinet door. On the other hand, the operator is kept away from conductive parts, making it safer. Furthermore, the lever action of the manual operating mechanism can reduce the force required for operation.

[0003] Currently, existing manual operating mechanisms for circuit breakers used in drawer cabinets require an operator outside the cabinet to rotate a handle on the drawer. This handle, via a square shaft, drives the manual operating mechanism, which in turn drives the circuit breaker to perform opening and closing actions. However, when the circuit breaker trips, the tripping force cannot be transmitted through the manual operating mechanism and the square shaft to the handle, preventing the operator outside the cabinet from knowing the circuit breaker's operating status. This can lead to operational errors or equipment damage, potentially causing safety hazards. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an adjustable assist device for the manual operation mechanism of a circuit breaker. When the circuit breaker trips, it can assist the square shaft drive handle to rotate to the trip position, avoid misoperation, and improve safety.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An adjustable assist device for the manual operation mechanism of a circuit breaker, comprising: A square shaft connects the handle and the manual operating mechanism. The handle drives the manual operating mechanism to perform opening and closing actions through the square shaft. The support plate is fixedly installed inside the drawer; A fixed seat is fixedly sleeved on the square shaft; The adjustment mechanism is mounted on the fixed base; The torsion spring has its first end abutting against the support plate, and its second end connected to the fixed base through an adjustment mechanism; The adjustment mechanism can achieve stepped fixing and releasing of the circumferential angle between the second end of the torsion spring and the fixed seat; by releasing and changing the circumferential angle, the initial preload of the torsion spring acting on the square shaft can be adjusted.

[0006] In some embodiments, the adjusting mechanism includes a screw cap and an elastic positioning component. The screw cap is rotatably mounted on a fixed base and abuts against the second end of a torsion spring. The elastic positioning component is disposed between the screw cap and the fixed base to achieve circumferential stepped positioning between the screw cap and the fixed base.

[0007] In some embodiments, the elastic positioning component includes a gear shift pin and a pin torsion spring. The gear shift pin is radially movably disposed along the fixed seat, and the pin torsion spring is used to provide elastic force to the gear shift pin to move radially outward. The inner peripheral wall of the screw cap has a plurality of adjustment slots arranged in annular array to match the gear shift pin. Under the action of the pin spring, the gear shift pin is partially embedded in any of the adjustment slots to achieve the stepped positioning.

[0008] In some embodiments, the gear shift pin is provided with an unlocking rod, and the side wall of the fixed seat is provided with an arc-shaped hole. The outer end of the unlocking rod passes through the arc-shaped hole and extends outside the fixed seat. By pressing the unlocking rod with external force, the unlocking rod drives the gear shift pin to overcome the elastic force of the pin torsion spring, so that the gear shift pin separates from the adjustment groove.

[0009] In some embodiments, one end of the gear shift pin is provided with a positioning shaft, which is inserted into the positioning hole of the fixed seat and forms a rotatable connection between the gear shift pin and the fixed seat.

[0010] In some embodiments, the top pin torsion spring is mounted on the positioning shaft, with one end of the top pin torsion spring abutting against the gear top pin and the other end of the top pin torsion spring abutting against the protrusion of the fixing seat.

[0011] In some embodiments, the other end of the gear shift pin is provided with an arc-shaped protrusion that engages with the adjustment groove. An unlocking ramp is provided between every two adjacent adjustment grooves. By rotating the cap with external force, the cap drives the unlocking ramp to abut against the arc-shaped protrusion of the gear shift pin, so that the gear shift pin switches between different adjustment grooves.

[0012] In some embodiments, the outer peripheral wall of the screw cap has multiple anti-slip grooves arranged in a ring array.

[0013] In some embodiments, the fixed base is provided with a positioning sleeve fitted on the square shaft, the screw cap is provided with a positioning hole through which the positioning sleeve can pass, the screw cap is provided with a receiving groove for placing a torsion spring at the corresponding position of the positioning hole, the screw cap is provided with a washer covering the receiving groove, and the positioning sleeve is provided with a plurality of hooks arranged in an array, the plurality of hooks passing through the positioning hole and engaging with the washer.

[0014] In some embodiments, the positioning sleeve has a plurality of hooks arranged in a ring array, and the plurality of hooks are respectively engaged in the receiving groove; the screw cap is provided with a limiting hole communicating with the receiving groove; the first end of the torsion spring has a first hook-shaped body engaged in the limiting hole; the second end of the torsion spring has a second hook-shaped body extending out of the screw cap; and the second hook-shaped body is engaged in the support plate.

[0015] The beneficial effects of this utility model are as follows: This adjustable assist device effectively solves the problem that the square shaft cannot rotate to the tripping position due to insufficient tripping force of the circuit breaker. When the circuit breaker trips, the torsion spring releases its force, and the torsion spring drives the fixed base and the square shaft to rotate in the tripping direction through the adjustment mechanism. The handle moves with the square shaft and rotates to the tripping position, so that the operator outside the cabinet can know the working status of the circuit breaker and effectively avoid misoperation. The adjustment mechanism can adjust the elastic force of the torsion spring, so that this assist device can meet the usage requirements of the manual operation mechanism (different operating force) of circuit breakers of different specifications, and has a wider range of applications. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is an assembly diagram of the adjustable assist device, handle, and manual operation mechanism according to an embodiment of the present utility model; Figure 2 This is a front view of the adjustable assist device, handle, and manual operation mechanism according to an embodiment of the present invention. Figure 3 This is a perspective view of an embodiment of the present utility model; Figure 4 This is an exploded view of an embodiment of the present utility model; Figure 5 This is a cross-sectional view of an embodiment of the present utility model; Figure 6 This is a perspective view of the gear shift pin in an embodiment of the present utility model; Figure 7 This is an assembly drawing of the screw cap and the stop pin in an embodiment of the present utility model. Detailed Implementation

[0018] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0020] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, and side, are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figure 1-5As shown, an adjustable assist device for a circuit breaker manual operating mechanism includes: a square shaft 1 connected between a handle 10 and a manual operating mechanism 2, wherein the handle 10 drives the manual operating mechanism 2 to perform opening and closing actions via the square shaft 10; a support plate 3 fixedly disposed within a drawer 4; a fixed seat 5 fixedly sleeved on the square shaft 1; an adjustment mechanism 6 disposed on the fixed seat 5; and a torsion spring 7, the first end of which abuts against the support plate 3, and the second end of which is connected to the fixed seat 5 via the adjustment mechanism 6. The adjustment mechanism 6 can achieve stepped fixing and releasing of the circumferential angle between the second end of the torsion spring 7 and the fixed seat 5. By releasing and changing the circumferential angle, the initial preload force of the torsion spring 7 acting on the square shaft 1 can be adjusted. The adjustment mechanism 6 includes a cap 61 and an elastic positioning component 62. The cap 61 is rotatably sleeved on the fixed seat 5 and abuts against the second end of the torsion spring 7. The elastic positioning component 62 is disposed between the cap 61 and the fixed seat 5 to achieve stepped circumferential positioning between the cap 61 and the fixed seat 5. The elastic positioning component 62 includes a gear shift pin 621 and a pin torsion spring 622. The gear shift pin 621 is radially movable along the fixed base 5. The pin torsion spring 622 provides elastic force to the gear shift pin 621, causing it to move radially outward. The inner circumferential wall of the cap 61 has a plurality of adjusting grooves 611 arranged in a ring to match the gear shift pin 621. Under the action of the pin spring 622, the gear shift pin 621 is partially embedded in any one of the adjusting grooves 611 to achieve stepped positioning. Multiple adjusting grooves that cooperate with the gear shift pin are provided inside the cap. The fixed base is locked circumferentially to the cap by the gear shift pin, thereby achieving 360° elastic force adjustment of the torsion spring, resulting in better gear shift feel and more convenient operation. An unlocking lever 6211 is provided on the gear shift pin 621. An arc-shaped hole 51 is opened on the side wall of the fixed base 5. The outer end of the unlocking lever 6211 passes through the arc-shaped hole 51 and extends outside the fixed base 5. When the unlocking lever 6211 is pressed by external force, the unlocking lever 6211 drives the gear shift pin 621 to overcome the elastic force of the pin torsion spring 622, so that the gear shift pin 621 separates from the adjustment groove 611. By moving the unlocking lever, the unlocking lever drives the gear shift pin to separate from the adjustment groove. By rotating the cap, the gear shift pin can be switched between different adjustment grooves, which helps to improve the convenience of operation.

[0022] like Figure 4-6 As shown, a positioning shaft 6212 is provided at one end of the gear shift pin 621. The positioning shaft 6212 is inserted into the positioning hole 52 of the fixed seat 5, forming a rotatable connection between the gear shift pin 621 and the fixed seat 5. The gear shift pin is rotatably positioned in the positioning hole of the fixed seat via the positioning shaft, thus facilitating the assembly of the gear shift pin and the fixed seat. A pin torsion spring 622 is fitted onto the positioning shaft 6212. One end of the pin torsion spring 622 abuts against the gear shift pin 621, and the other end abuts against the protrusion 53 of the fixed seat 5. The two ends of the pin torsion spring abut against the gear shift pin and the protrusion of the fixed seat, respectively, thus facilitating the assembly of the torsion spring with the gear shift pin and the fixed seat.

[0023] like Figure 7 As shown, the other end of the gear shift pin 621 is provided with an arc-shaped protrusion 6213 that engages with the adjustment groove 6211. An unlocking ramp 612 connects every two adjacent adjustment grooves 611. By rotating the cap 61 with external force, the cap 61 drives the unlocking ramp 612 to abut against the arc-shaped protrusion 6213 of the gear shift pin 621, allowing the gear shift pin 621 to switch between different adjustment grooves 611. When rotating the cap, the arc-shaped protrusion of the gear shift pin can slide along the unlocking ramp, thereby enabling the gear shift pin to switch between different adjustment grooves and adjusting the spring force of the torsion spring. Multiple anti-slip grooves 613 are arranged in a circular array on the outer peripheral wall of the cap 61. The anti-slip grooves provide anti-slip properties, making it easier for the operator to rotate the cap and improving operation.

[0024] like Figure 4-5 As shown, the fixed base 5 is provided with a positioning sleeve 54 fitted onto the square shaft 1. The screw cap 61 is provided with a positioning hole 614 through which the positioning sleeve 54 can pass. The screw cap 61 is provided with a receiving groove 615 for placing the torsion spring 7 at the corresponding position of the positioning hole 614. The screw cap 61 is provided with a washer 616 covering the receiving groove 615. The positioning sleeve 54 is provided with a plurality of hooks 541 arranged in an array. The plurality of hooks 541 pass through the positioning hole 614 and are engaged with the washer 616. The fixed base is engaged with the washer by the plurality of hooks, and the washer restricts the torsion spring within the receiving cavity, thereby facilitating the assembly of the screw cap with the fixed base and the torsion spring and improving assembly efficiency. The positioning sleeve 54 has multiple hooks 542 arranged in a ring array, each hook 542 engaging within a receiving groove 615. The cap 61 has a limiting hole 617 communicating with the receiving groove 615. The torsion spring 7 has a first hook-like body 71 at its first end engaging within the limiting hole 617, and a second hook-like body 72 at its second end extending outside the cap 61, engaging with the support plate 3. The positioning sleeve, engaged with the cap's receiving groove by multiple hooks, facilitates the assembly of the fixing base and the cap, ensuring reliable rotation of the cap on the fixing base. The torsion spring, engaged with the cap's limiting hole by its first hook-like body, and with the support plate by its second hook-like body, facilitates the assembly of the torsion spring with the cap and support plate, resulting in higher assembly efficiency.

[0025] This adjustable assist device effectively solves the problem of the square shaft failing to rotate to the tripped position due to insufficient tripping force of the circuit breaker. When the circuit breaker trips, the torsion spring releases its energy, and the torsion spring drives the fixed seat and the square shaft to rotate in the opening direction through the adjustment mechanism. The handle moves with the square shaft and rotates to the tripped position, allowing operators outside the cabinet to know the circuit breaker's operating status and effectively preventing misoperation. The adjustment mechanism can adjust the spring force of the torsion spring, thus meeting the usage requirements of manual operating mechanisms (different operating forces) for different specifications of circuit breakers, broadening its applicability. During operation, when the square shaft rotates in the closing direction, the fixed seat and adjustment mechanism rotate with the square shaft, storing energy in the torsion spring; when the circuit breaker trips, the torsion spring releases its energy, and the spring force drives the fixed seat and adjustment mechanism to rotate the square shaft in the opening direction; thus, it assists the square shaft in rotating to the tripped position, and the square shaft drives the handle to rotate to the tripped position.

[0026] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. An adjustable assist device for a manual operating mechanism of a circuit breaker, characterized in that: include: A square shaft connects the handle and the manual operating mechanism. The handle drives the manual operating mechanism to perform opening and closing actions through the square shaft. The support plate is fixedly installed inside the drawer; A fixed seat is fixedly sleeved on the square shaft; The adjustment mechanism is mounted on the fixed base; The torsion spring has its first end abutting against the support plate, and its second end connected to the fixed base through an adjustment mechanism; The adjustment mechanism can achieve stepped fixing and releasing of the circumferential angle between the second end of the torsion spring and the fixed seat; by releasing and changing the circumferential angle, the initial preload of the torsion spring acting on the square shaft can be adjusted.

2. The adjustable assist device for the manual operation mechanism of a circuit breaker according to claim 1, characterized in that: The adjustment mechanism includes a screw cap and an elastic positioning component. The screw cap is rotatably mounted on the fixed base and abuts against the second end of the torsion spring. The elastic positioning component is disposed between the screw cap and the fixed base to achieve circumferential stepped positioning between the screw cap and the fixed base.

3. The adjustable assist device for the manual operation mechanism of a circuit breaker according to claim 2, characterized in that: The elastic positioning component includes a gear shift pin and a pin torsion spring. The gear shift pin is radially movable along the fixed base. The pin torsion spring provides elastic force to the gear shift pin to move radially outward. The inner circumferential wall of the screw cap has a plurality of adjustment slots arranged in annular array to match the gear shift pin. Under the action of the pin spring, the gear shift pin is partially embedded in any of the adjustment slots to achieve the stepped positioning.

4. The adjustable assist device for the manual operation mechanism of a circuit breaker according to claim 3, characterized in that: The gear shift pin is equipped with an unlocking rod, and the side wall of the fixed seat has an arc-shaped hole. The outer end of the unlocking rod passes through the arc-shaped hole and extends outside the fixed seat. When the unlocking rod is pressed by external force, the unlocking rod drives the gear shift pin to overcome the elastic force of the pin torsion spring, so that the gear shift pin separates from the adjustment groove.

5. The adjustable assist device for the manual operation mechanism of a circuit breaker according to claim 4, characterized in that: The gear shift pin has a positioning shaft at one end, which is inserted into the positioning hole of the fixed seat and forms a rotatable connection between the gear shift pin and the fixed seat.

6. The adjustable assist device for the manual operation mechanism of a circuit breaker according to claim 5, characterized in that: The top pin torsion spring is mounted on the positioning shaft, with one end of the top pin torsion spring abutting against the gear top pin and the other end of the top pin torsion spring abutting against the protrusion of the fixed seat.

7. The adjustable assist device for the manual operation mechanism of a circuit breaker according to claim 4, characterized in that: The other end of the gear shift pin is provided with an arc-shaped protrusion that engages with the adjustment groove. An unlocking ramp is provided between every two adjacent adjustment grooves. When the cap is rotated by external force, the cap drives the unlocking ramp to abut against the arc-shaped protrusion of the gear shift pin, so that the gear shift pin switches between different adjustment grooves.

8. The adjustable assist device for a manual operating mechanism of a circuit breaker according to any one of claims 2-7, characterized in that: The outer peripheral wall of the screw cap has multiple anti-slip grooves arranged in a ring array.

9. The adjustable assist device for a manual operating mechanism of a circuit breaker according to any one of claims 2-7, characterized in that: The fixed base is provided with a positioning sleeve fitted on the square shaft. The screw cap is provided with a positioning hole through which the positioning sleeve can pass. The screw cap is provided with a receiving groove for placing a torsion spring at the corresponding position of the positioning hole. The screw cap is provided with a washer covering the receiving groove. The positioning sleeve is provided with a plurality of hooks arranged in an array. The plurality of hooks pass through the positioning hole and are fastened to the washer.

10. The adjustable assist device for the manual operation mechanism of a circuit breaker according to claim 9, characterized in that: The positioning sleeve has multiple hooks arranged in a ring array, and the multiple hooks are respectively engaged in the receiving groove; the screw cap is provided with a limiting hole that communicates with the receiving groove; the first end of the torsion spring has a first hook-shaped body that engages in the limiting hole; the second end of the torsion spring has a second hook-shaped body that extends out of the screw cap; the second hook-shaped body engages in the support plate.

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