JPH0447884Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The present invention locks the handle of a breaker that is interposed between a power supply and a load and is capable of cutting off power supply from the power supply to the load when an abnormality is detected in the load. This invention relates to a handle lock device for a breaker.

[Background technology]

In this type of breaker, in which the operation part of the handle that opens and closes the movable contact and the fixed contact protrudes from the top surface of the casing, a handle lock device is provided that locks the handle and prevents it from being operated. The lock body is press-fitted into and held in the lock, and there was a problem that the fit was either too tight or too loose due to the delicate dimensional relationship. In other words, one end of the lock body is press-fitted into the operation part of the handle, and the other end comes into contact with a key point of the casing to prevent rotation of the handle, but when the handle is operated, the lock body I had a problem with the handle moving upwards and not being able to lock the handle.

[Purpose of invention]

The present invention has been proposed in view of the above-mentioned points, and it is an object of the present invention to provide a breaker handle locking device that is easy to attach and detach, and that can be reliably integrated with the handle when attached.

[Disclosure of invention]

An embodiment of the present invention will be described below with reference to the drawings. First, the basic structure and operation of the breaker will be explained based on FIGS. 2 to 9. Second
The figure shows the appearance of a single-pole type breaker body, which is the basis of the present invention.As shown in the figure, the breaker body 1 consists of a pair of synthetic resin casings 2.
₁ , 2 ₂ with a fixing device such as a screw or rivet 3
A handle 4 for opening and closing the circuit is provided protruding from the upper surface of the breaker body 1. Figure 3 shows the state in which the fixture 3 has been removed and one casing 2 ₁ has been removed from the other casing 2 ₂ . As shown in the figure, there is a pair of casings 2 ₁ and 2 ₂ between them. External connection terminal 5
₁ and 5 ₂ , a movable contactor 6, and an arc extinguishing device 7. 4 and 5 individually show the parts required for the operation of the breaker, and FIGS. 7 to 9 show the cross-sectional structure of the breaker. In each of the above figures, the movable contact 8 attached to the tip of the movable contact 6 comes into contact with and separates from the fixed contact 10 attached to one terminal plate 9 ₁ to open and close the main circuit. ing. A tightening screw 13 and a nut 12 are attached to each terminal plate 9 ₁ , 9 ₂ via a washer 11 that also serves as a spring washer, thereby forming a pair of external connection terminals 5 ₁ , 5 _{2 .} has been done. The bimetal 15 is a thermally responsive element for overcurrent detection, and the engagement hole 15 of this bimetal 15
Projection piece 1 of a conductive plate 61 made of a conductive material described below in a
4 is inserted and snapped, and the bimetal 15 and the conductive plate 61 are combined. One end of the braided wire 16 is welded to the free end side of the bimetal 15, and the other end of the braided wire 16 is welded to the movable contact 6. The movable contactor 6 is caulked to a movable arm 17, and the movable arm 17 is adapted to be fitted into a bottom opening 18a of a movable frame 18. Reference numeral 19 denotes a rotating shaft for pivotally supporting the handle 4, movable arm 17, and movable frame 18, and the center portion 19 of this rotating shaft 19
a is bent into a substantially U-shape so as to fit into a groove 4a in the handle 4. Also, the rotation axis 1
Both end portions 19b of the movable arm 17 are fitted into U-shaped grooves 20 that serve as pivot points of the movable arm 17, and the movable frame 1
8 and the U-shaped groove 22. The tension spring 23 is attached to the handle 4
to the on and off positions. One end of this tension spring 23 is connected to the rotating shaft 19.
The other end is engaged with a pin 25 whose both ends are supported in the shaft hole 24 of the movable arm 17. Therefore, the handle 4 has a tension spring 2, as shown in FIGS. 7 and 8.
3 crosses the rotation center P of the rotating shaft 19, and is biased toward the on position or the off position. Also, due to the tensile force of the tension spring 23, the movable arm 17, the movable frame 18, and the rotating shaft 19 are
It is now possible to integrate the However, one end of the movable frame 18 has a protruding portion 2.
6 is formed, and the concave groove 4b of the handle 4 can be engaged with this protrusion 26 as shown in FIG. It is designed to prevent the object from flying out in the direction shown by arrow A.

Next, the compression coil type spring 27 is for forcibly opening the movable contactor 6 during the tripping operation, and the tip portion 27a of this spring 27
is adapted to be inserted into and engaged with an engagement hole 29 provided in the spring seat 31 of the movable frame 18. This spring 27 is housed in the storage space 30 of both casings 2 ₁ and 2 ₂ , and the rear end 27 b of the spring 27 comes into contact with the inner bottom surface 30 a of the spring 27 . Note that the spring seat 31 of the engagement hole 29 of the movable frame 18 is formed to be slightly inclined in order to improve contact with the spring 27. The yoke 64 is formed of a magnetic material into a U-shape, and fixed pieces 69 are protruded from the upper and lower parts of the yoke 64, respectively. A flat magnetic plate 62 made of a magnetic material is electrically conductive and brought into close contact with one surface of the flat conductive plate 61, and a fixing piece 69 of the yoke 64 is inserted into a fixing hole 70 drilled in the conductive plate 61 and the magnetic plate 62. , a magnetic plate 62 and a conductive plate 6 as shown in FIG.
1 and yoke 64 are coupled. A coil 65 through which a load current flows is wound around the outer peripheral surface of a cylindrical outer tube 67 disposed within the yoke 64. A stopper 68 is also fixed to a hole drilled in the center piece of the yoke 64. A plunger 66 is movably housed within the outer cylinder 67, and its disc-shaped tip 71 projects outward through an insertion hole 72 in the conductor 61 and magnetic plate 62. These members constitute a large current detection mechanism that is an electromagnetic device that detects a large current such as a short circuit current flowing through the coil 65. By the way, both ends 61a and 61b of the conductive plate 61 are fitted into vertical grooves 73 ₁ and 73 ₂ formed in the inner wall surfaces of the casings 2 ₁ and 2 ₂ , so that the conductive plate 61 is inserted into both the casings 2 ₁ and 2 _{2 .} It is clamped and fixed to hold the large current detection mechanism. One end 65a of the coil 65 is connected to the end of the braided wire 63 connected to the terminal plate ₉₂ , and the other end 65b of the coil 65 is connected to the side piece 61c of the conductive plate 61.
is combined with Both ends of the pivot pin 39 inserted into the pivot hole 38 of the latch plate 37 are supported by the engagement holes 40 of both the casings 2 ₁ and 2 ₂ , making the latch plate 37 freely rotatable. A locking step portion 44 is formed at the tip of the side piece 43 of the latch plate 37, and is adapted to abut against a locking portion 45 of the movable frame 18. A torsion spring 46 that presses the upper piece 42 of the latch plate 37 toward the free end side of the bimetal 15 is attached to a pivot boss 47 that protrudes from the inner wall surface of the casing ₂₁ .
It is pivoted on. The lower end of the torsion spring 46 is in contact with the back side of the upper piece 42 of the latch plate 37, and the upper end is in contact with the wall surface within the recess 74. A leaf spring 75 housed in the recess 74 is in contact with the handle 4, as shown in FIG. 7, when the handle 4 is in the off position. A notch 76 is formed at the lower end of the latch plate 37, and the tip 71 of the plunger 66 engages with this notch 76, and the coil 6
A magnetic attraction force is generated by the short-circuit current flowing through the plunger 5, and the plunger 66 is attracted to the magnetic plate 62 side. Then, the latch plate 37 is rotated counterclockwise in FIG. 8 using the tip end 71 of the plunger 66 to release the engagement between the latch plate 37 and the movable frame 18, thereby performing a so-called tripping operation.
In addition, the latch plate 37, spring 27, movable frame 18
The trip means is constituted by the above.

In addition, both the casings 2 ₁ and 2 ₂ have a shaft support hole 48 for supporting both ends 19b of the rotating shaft 19, a hole 49 for fitting the fixture 3, and a hole 49 for exhausting gas generated when the circuit is interrupted. An exhaust hole 50 and the like are provided for this purpose.

The arc extinguishing device 7 is formed by holding a plurality of arc extinguishing plates 51 made of a magnetic material at appropriate intervals with side plates 52 made of an insulating material.
The arc generated when the movable contact 8 and the fixed contact 10 are separated can be extinguished as quickly as possible. Each arc-extinguishing plate 51 is provided with a notch 51a so that the movable contact 6 can pass therethrough. A substantially V-shaped groove 51b is formed at the lower end of the notch 51a, and the gas accumulated around the contact is transferred to a gas retention part 53 formed behind the fixed contact 10 through this groove 51b. By discharging it, the blocking performance can be improved. Also, an arc extinguishing chamber 54 that stores the arc extinguishing device 7
A partition wall 56 is formed between the arc extinguishing chamber 54 and the cutoff mechanism section in which the spring 27 and the movable frame 18 are housed to prevent the arc from the arc extinguishing chamber 54 from entering the cutoff mechanism section 55. It is something.

Next, the operation of the breaker of the unipolar type according to this embodiment will be explained with reference to FIGS. 7 to 9. First, Figure 7 shows the state when the breaker is off,
In this state, the movable contact 8 and the fixed contact 10 are separated. At this time, the movable contactor 6 is urged by the tensile force of the tension spring 23, and is separated to a position where it comes into contact with the opening edge of the bottom opening 18a of the movable frame 18. Further, the handle 4 is similarly biased by the tensile force of the tension spring 23 and is stopped at a position where the groove 4b engages with the protrusion 26.
Further, the leaf spring 75 presses against the outer peripheral surface of the handle 4, and its lower end presses against the latch plate 37. In this state, the locking portion 45 of the movable frame 18 is securely engaged with the locking step portion 44 of the latch plate 37.
Further, due to this engagement, the spring 27 for tripping operation remains compressed within the storage space 30.

Next, FIG. 8 shows the state when the breaker is on. In this state, the movable contact 6 is urged by the tensile force of the tension spring 23, and the movable contact 8 is in pressure contact with the fixed contact 10. It's stopped. Further, the handle 4 is similarly biased by the tensile force of the tension spring 23, and is stopped at a position where the operating portion of the handle 4 is in contact with the casings 2 ₁ and 2 ₂ . In this manner, the direction in which the movable contactor 6 and the operating portion of the handle 4 are biased is reversed at the point where the tension spring 23 crosses the rotation center P of the rotation shaft 19. When the circuit breaker is on, the lower end of the leaf spring 75 is no longer pressed against the outer peripheral surface of the handle 4, as shown in FIG. The latch plate 37 is moved away from the upper piece 42 of the plate 37 and becomes rotatable in the counterclockwise direction. Therefore, if the bimetal 15 deforms due to overcurrent and presses the upper piece 42, or the coil 65
When a short-circuit current flows through the latch plate 37, the plunger 66 is attracted and driven by its magnetic attraction force, and the latch plate 37 is rotated about the pivot pin 39.
As a result, the locking step portion 44 and the locking portion 45 are disengaged, the spring 27 is expanded, and the movable frame 18
is adapted to rotate about the rotation center P of the rotating shaft 19. FIG. 9 shows a state in which the tripping operation is performed due to an overcurrent. As shown in the figure, the movable frame 18 is moved by the spring 2.
Since it is pressed and rotated by the movable contact 6
is pushed by the opening edge of the bottom opening 18a of the movable frame 18 and is forcibly driven in the contact opening direction. When the movable contact 6 is separated by a predetermined distance, it is further driven in the direction of contact separation by the tensile force of the tension spring 23, and finally the movable arm 17 comes into contact with the pivot pin 39, and the movable arm 17
is stopped, and the handle 4 is stopped at a position where the groove 4b is engaged with the protrusion 26 of the movable frame 18. At this time, since the movable frame 18 is tilted, the operating portion of the handle 4 stops approximately at the center between the on position and the off position, indicating that a trip operation has been performed. When such a tripping operation is performed, unless the handle 4 is returned to the OFF position and the engagement between the locking step portion 44 and the locking portion 45 is restored as shown in FIG.
cannot be stopped at the ON position. As is clear from a comparison between FIG. 7 and FIG. 8, the bottom opening 18a of the movable frame 18
The opening width of the movable contact 6 is longer than the opening/closing stroke of the movable contact 6. Therefore, when a trip operation is not performed such as during manual opening/closing operation, the movable contact 6 is moved by the spring 27, the movable frame 18, and the opening width of the movable contact 6. It is not affected by contact breaking mechanisms such as the latch plate 37. In addition, in this embodiment, the latch plate 3 when the lower end of the torsion spring 4b is turned off is
Since the upper piece 42 of the handle 4 is strongly pressed, it is possible to reduce the possibility that the locking step portion 44 and the locking portion 45 will come out of engagement due to vibrations when the handle 4 is manually opened and closed.

By the way, when the movable contact 8 and the fixed contact 10 are opened and the main circuit is interrupted, an arc is generated between the movable contact 8 and the fixed contact 10. The arc is extinguished as quickly as possible by a plurality of arc extinguishing plates 51. As described above, a substantially V-shaped groove 51b is formed at the lower end of the notch 51a of the arc-extinguishing plate 51, and this groove 51b is located below the terminal plate ₉₁ as shown in FIG. It is arranged. Therefore, the gas generated around the contact when the circuit is interrupted is quickly discharged to the gas retention section 53 at the rear of the terminal plate ₉₁ through the cut groove 51b.
Furthermore, since the gas discharged into the gas retention portion 53 is discharged from the exhaust hole 50, the amount of arc ejected to the outside can be reduced. In addition to this exhaust hole 50, an exhaust hole 50 is provided on the opposite side of the arc extinguisher 7, and by releasing gas in both directions, the efficiency of gas discharge from the arc extinguisher 7 is increased. It is something.

Next, the lock body 81 for locking the handle 4, which is the gist of the present invention, will be explained with reference to FIG.
That is, the lock body 81 is made of thermoplastic resin and has elasticity, and one end side consists of a rectangular cylindrical fitting part 83, and the other end side consists of a flat and arcuate stopper piece 84. . As shown in FIG. 2, the operating portion 4c of the handle 4 of the breaker body 1 protrudes from the upper surface of the casings 2 ₁ and 2 ₂ through the opening windows 86 of the casings 2 ₁ and 2 ₂ . The operating portion 4c of the handle 4 is formed to be one step thinner than the upper end, and a stepped portion 85 is formed at the boundary. on the other hand,
An engaging pawl 82 that engages with the stepped portion 85 is integrally provided on the inner wall surface below the fitting portion 83 of the lock body 81 in a protruding manner. Further, the inner wall surface of the lock body 81 provided with the engaging claw 82 is formed with a tapered surface 87 that slopes downward from the engaging claw 82. Then, as described later, the lock body 81 is attached to the handle 4.
A space 88 is created between the outer surface of the handle 4 and this tapered surface 87 when the handle 4 is fitted into the handle 4. Stopper piece 84 of lock body 81
is curved to draw an arc concentric with the center O of the circle around which the handle 4 rotates, and the end surface of this stopper piece 84 touches the inner wall surface of the opening window 86 of the casing 2 ₁ , 2 ₂ . They are in contact with each other to prevent rotation of the handle 4.

Therefore, as shown in FIG. 1c, the lock body 8
When the fitting part 83 of 1 is fitted onto the operating part 4c of the handle 4 from above, the engaging claw 82 of the lock body 81 is clicked into the stepped part 85 of the handle 4, so that the lock body 81 is securely attached to the handle 4. It will be integrated and fixed. Of course, when removing it, by pulling up the elastic stopper piece 84 a little,
Step portion 85 of handle 4 and engaging claw 8 of lock body 81
2 becomes a little loose and becomes easy to come off. Therefore, when the lock body 81 is pulled upward, the engagement pawl 82 comes off from the stepped part 85, and the lock body 81 cannot be easily removed from the handle 4. can.
When the lock body 81 is fitted into the handle 4, the end surface of the stopper piece 84 is connected to the opening window 8 as described above.
6 and prevents rotation of the handle 4. Here, when the handle 4 is rotated in the direction shown by arrow A in FIG. 1c, the stopper piece 84
The X portion at the tip of the lock body 81 serves as a fulcrum.
The force that tries to push up in the direction of the arrow B,
A force in the direction of arrow C acts as a reaction force to the operating force.
As for this force, the force in the direction of arrow C is larger than the component force in the direction of arrow B, so the force in the direction of arrow B can be overcome with a slight engagement force between the engaging claw 82 and the stepped portion 85. Therefore, the lock body 81 cannot be removed from the handle 4. By the way, since a space 88 is formed between the handle 4 and the lock body 81, when an attempt is made to forcibly rotate the handle 4, an upward force acts on the lock body 81, which causes the engagement pawl to 82 comes into contact with and receives the stepped portion 85 of the handle 4, thereby further suppressing the rotation of the handle 4. Furthermore, the first
FIG. 0 shows a one-pole type breaker body 1, and a lock body 81 shown in FIG. 1 is fitted into the handle 4 of this breaker body 1.

FIG. 11 shows a case where two of the breaker bodies 1 are arranged side by side to form a bipolar type, and FIG. 12 shows a lock body 81 ₁ fitted to the handle 4 ₁ . It is basically the same as the lock body 81 shown in FIG. 1, and the lock body 81 ₁ is also formed horizontally long to match the horizontally long bipolar handle 4 ₁ . That is, the fitting portion 83 of the lock body 81 ₁ is formed horizontally long to match the handle 4 ₁ , and the stopper piece 84
are provided on both sides corresponding to the opening windows 86 of the two breaker main bodies 1. Further, the engaging pawl 82 is formed integrally and protrusively from the center portion of the inner wall surface of the lock body ₈₁₁ . The operation is the same as in Figure 1,
Explanation will be omitted.

Fig. 13 shows a case where three single-pole type breaker bodies 1 are arranged in parallel to form a three-pole type, and the lock body ₈₁₂ is also changed to match the horizontally elongated handle ₄₂ as shown in Fig. 14. It is formed horizontally. The basic structure of this lock body ₈₁₂ is the same as that shown in FIG. 1, and three stopper pieces 84 are formed on both sides and in the center to match the opening windows 86 of the three breaker bodies 1. The engaging pawl 82 is formed integrally and protrusively from the center portion of the inner wall surface of the lock body ₈₁₂ . Action is the first
This is the same as the case shown in the figure.

[Effect of the invention] As described above, the present invention provides a breaker in which the operation part of the handle, which opens and closes the movable contact and the fixed contact by rotating the handle, protrudes from the upper surface of the casing. A fitting part that fits into the operating part of the handle and has an engaging pawl on the inner wall surface that engages with the engaging part on one end; An elastic lock body is formed, which has an arc concentric with the rotation circle of the handle, and a stopper piece whose other end abuts a key point of the casing to prevent rotation of the handle, Since a space is formed between the outer surface of the lower lock body and the outer surface of the handle, the step part of the handle and the engaging pawl of the lock body are engaged with each other to open the fitting part of the lock body. It is easy to attach the lock body to the handle simply by fitting the lock body into the operating part of the handle, and when the lock body is attached to the handle, the engaging pawl engages with the stepped part, so that the lock body can be easily attached to the handle. The body is securely integrated with the handle and cannot be easily removed even if the lock body is pulled in the opposite direction to the direction in which the lock is installed. Since it comes into contact with a key point on the casing and prevents the handle from rotating, when the handle is rotated, the other end of the stopper piece acts as a fulcrum and the lock body is moved by force. A force acts in the direction that the lock comes off, but since the stopper piece is formed concentrically with the rotation circle of the handle, the reaction force of the operating force is greater than the component force, so the lock body comes off from the handle. This has the effect of being highly reliable, and when removing the lock body from the handle, simply pulling up the elastic stopper piece slightly loosens the engagement part between the stepped part and the engaging pawl. If the lock body is pulled up as it is, the engagement between the stepped portion and the engaging pawl is disengaged, and the lock body can be easily removed from the handle. In addition, since a space is formed between the outer surface of the lock body below the engaging claw and the outer surface of the handle, if you try to forcefully rotate the handle further, the outer surface of the handle will pass through the space. By contacting the outer surface of the lock body, an upward force is applied to the lock body, and as a result, the engagement pawl comes into contact with the stepped part of the handle and is received, further suppressing the rotation of the handle. It is effective.

[Brief explanation of the drawing]

1A to 1D are a plan view, a front view, a sectional view, and a side view of a lock body according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the external appearance of a breaker according to an embodiment of the present invention. Figure 3 is a perspective view of the same as above with both casings open, Figures 4 and 5 are perspective views showing the components of the above, Figure 6 is a sectional view of the large current detection mechanism of the same as the above, and Figure 7 is the same as the above. 8 is a sectional view showing the circuit breaker in the OFF state, FIG. 9 is a sectional view showing the same in the ON state, and FIG. 9 is a sectional view showing the circuit breaker in the trip state;
Figures 10 a, b, and c are a plan view, front view, and side view of the same as above; Figures 11 a, b, and c are a plan view, front view, and side view of the same bipolar type;
Figures 2 a to d are a plan view, front view, sectional view, and side view of the main parts of the same lock body, and Figures 13 a, b,
c is a plan view, front view, and side view of the same three-pole type as above, and Figures 14a to d are a plan view, front view, sectional view, and side view of the main part of the same lock body. be. 2 is a casing, 4 is a handle, 8 is a movable contact, 10 is a fixed contact, 81 is a lock body, 82 is an engaging claw, 83 is a fitting part, 84 is a stopper piece, 85 is a step part, and 88 is a space. .

Claims (1)

[Scope of utility model registration request] In a breaker in which the operating part of the handle that opens and closes the movable contact and the fixed contact by rotating the handle protrudes from the upper surface of the casing, an engagement step part that is one step thinner than the upper end is formed in the upper part of the handle, and one end side a fitting part that fits into the operating part of the handle and has an engaging claw on the inner wall surface that engages with the engaging stepped part, and an arc concentric with the rotation circle of the handle on the other end side; An elastic lock body is formed, the other end of which has a stopper piece that comes into contact with a key point of the casing to prevent rotation of the handle, and the outer surface of the lock body below the engaging claw and the outer surface of the handle are connected to each other. A handle locking device for a breaker, characterized in that a space is formed between the handles.