JP2008300327A - Handle lock device of circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handle lock device of a circuit breaker in which a locking member cannot be easily dislocated from an operation handle even if an external force (load) is given manually in a reset direction in a condition that a handle lock device is mounted on the operation handle and is locked at an OFF position. <P>SOLUTION: The handle lock device of a circuit breaker is composed of an assembly of a locking member 6 having a plate with a locking hole 6b extruding from the cap portion to an ON side end edge of an open mouth portion of a case cover integrally with a cap portion 6a to be locked with a knob portion 3a at an OFF position and a stopper piece 7 with a locking hole 7a provided with a pawl portion 7c which guides and supports in an inclined movement to positions ON and OFF sliding on the plate of the locking member and is locked with a stepped portion 3b of a handle knob portion at a LOCK position. As a supporting means for preventing a dislocation of the locking member 6, projections 6e, 6f, 6g are formed on the locking member 6, and the handle lock device 5 is prevented from being dislocated from the operation handle 3 by an external force given in an arrow direction P. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a handle lock device for a circuit breaker intended for a circuit breaker for wiring, an earth leakage breaker and the like.

  The above-mentioned circuit breakers and earth leakage circuit breakers are often installed and used in the panel of distribution boards as components of low-voltage distribution equipment. On the other hand, when performing maintenance and inspection of the switchboard, the circuit breaker is disconnected and the work is performed in a non-hot line state in order to ensure work safety. It is necessary to lock the operation handle to the OFF position to prevent the circuit breaker from being accidentally turned on by mistake during maintenance and inspection work.

  Therefore, various types of handle lock devices for locking the operation handle to the OFF position have been proposed as an accessory device (optional product) for the circuit breaker, and as an example, the operation handle can be operated with the circuit breaker in the OFF state. A handle lock device is proposed earlier than the same applicant as the present invention, in which the handle is locked so that the handle cannot be inserted into the ON position and then locked with a padlock. (See Patent Document 1).

  Next, conventional structures of the circuit breaker and the proposed handle lock device are shown in FIGS. First, in FIGS. 3 and 4, 1 is a circuit breaker case, 2 is a case cover, 3 is a rocker-type operation handle, 4 is a handle lever, and the operation handle 3 has a knob 3a of the case cover 2. It protrudes outward through the opening 2a. In addition, a constricted step portion 3b is formed at the middle portion of the knob portion 3a so that the fingertip can be easily caught on the knob portion when the handle is manually moved to the ON, OFF, and RESET positions.

  On the other hand, a handle lock device 5 which is attached to the knob 3a and locks the operation handle to the OFF position is described in detail in Patent Document 1, and as shown in FIGS. 4 and 5, the lock member 6 and the lock It becomes an assembly (made of mold resin) with the stopper piece 7 attached to the plate of the member 6. Here, the lock member 6 includes a sheath-like cap portion 6a that is fitted to the knob portion 3a at the OFF position of the operation handle 3, and a lock that protrudes from the cap portion 6a toward the ON side edge of the opening portion 2a of the case cover. The plate is integrally molded, and a plurality of lock holes 6b and a stopper piece 7 described later can be rotated to the “lock” and “open” positions so that a padlock (not shown) can be hooked on the lock plate. A support shaft 6c for guiding and supporting and an arcuate guide groove 6d are provided.

  The stopper piece 7 is pivotally mounted on the support shaft 6c of the lock member 6 so as to be rotatable, and a locking hole 7a corresponding to the lock hole 6b of the lock member 6 is formed on the plate surface. A guide claw 7b that fits into the guide groove 6d of the lock member 6 and an engagement claw portion 7c that is hooked on a constricted step portion 3b formed on the handle knob 3a at the “lock” position of the stopper piece are formed.

In the handle lock device 5 as shown in FIG. 4, the cap portion 6a of the lock member 6 is fitted to the knob portion 3a of the operation handle 3 in the OFF state of the circuit breaker (at this time, the stopper piece 7 is Then, the stopper piece 7 is tilted to the “lock” position shown in FIG. As a result, the engaging claw portion 7c of the stopper piece 7 protrudes to the inside of the cap through the notch groove of the cap portion 6a and engages with the constricted step portion 3b of the knob portion 3a to prevent the handle lock device 5 from coming off. In this state, the lock plate protruding from the cap portion 6a of the lock member 6 is fitted between the ON side edge of the opening 2a of the case cover so that the operation handle 3 cannot move from the OFF position to the ON position. To be restrained. Further, when the padlock is locked through the locking holes 6b and 7a of the lock member 6 and the stopper piece 7 in this mounted state, the operation handle 3 is locked to the OFF position and cannot be operated to the ON position.
JP 2006-19203 A

  Incidentally, the above-described conventional handle lock device has the following problems in terms of handling operation and functions.

  That is, after the circuit breaker has tripped, in order to electrically and mechanically reopen the contact mechanism of the circuit breaker, the operation handle 3 stopped at the TRIP position is temporarily moved beyond the OFF position to the RESET position ( The reset operation is performed so as to move to the load side of the circuit breaker, and then the operation is turned on again to the ON position. That is, the opening 2a of the case cover 2 is set so that the operation handle 3 can move from the OFF position to the RESET position (right side of the OFF position in the figure) in response to the reset operation.

  Thus, even when the handle lock device 5 is mounted on the knob 3a at the OFF position of the operation handle 3, as shown in FIG. 5, the gap between the handle knob 3a and the RESET side edge of the opening 2a of the case cover is shown. It is possible that the gap gap remains, and the handle lock device 5 is pushed to the right side together with the operation handle 3 within the range of the gap.

  Therefore, in the handle lock state of FIG. 5, when a force (load) is applied to the lock member 6 of the handle lock device 5 in the illustrated arrow P direction (load side of the circuit breaker case), the gap gap Within the range, the operation handle 3 and the handle lock device 5 are integrally tilted in the RESET direction. In this case, the operation handle 3 rotates along an arc-shaped movement locus with the tip of the handle lever 4 as a pivotal support point, whereas the operation force applied to the handle lock device 5 is the linear direction of the arrow P shown in the figure. (When the circuit breaker case is installed in the horizontal position, the horizontal direction, and when the circuit breaker case is installed in the vertical position, the vertical direction). Further, there is some backlash between the knob 3a and the cap 6a of the lock member 6 fitted here. As a result, a component load is applied to the lock member 6 of the operation handle 3 in the direction of coming out of the knob 3a of the operation handle 3, and the handle lock device that receives this load falls to the RESET side, resulting in the stopper piece. 7 is disengaged between the engaging claw portion 7c and the constricted step portion 3b formed on the knob portion 3a, and the handle lock device 5 comes off the operation handle 3 relatively easily and falls off.

  The present invention has been made in view of the above points. The object of the present invention is to solve the above-mentioned problems, and manually apply an external force (load) in the RESET direction with the handle lock device attached to the operation handle and locked in the OFF position. It is an object of the present invention to provide a circuit breaker handle lock device having an improved structure so that the lock member is not easily detached from the operation handle even if the above is added.

In order to achieve the above object, according to the present invention, there is provided a circuit breaker handle lock device for locking a rocker-type operation handle having a knob protruding outward through an opening of a case cover to an OFF position. A locking member in which a plate with a locking hole projects from the cap portion toward the ON side edge of the opening portion of the case cover integrally with the cap portion that is fitted to the knob at the handle OFF position; A stopper piece with a locking hole provided with a pawl portion that can be tilted and supported to the “lock” and “open” positions along the plate and that engages the knob portion of the operation handle at the “lock” position. In what
A stopper that protrudes from the lock member and prevents the handle from moving and tilting in the RESET direction is provided as the lock member retaining support means (Claim 1), and the stopper is specifically as described below. Consists of.
(1) The stopper is a protrusion protruding from the cap portion of the lock member toward the base side. When the stopper is attached to the operation handle, the protrusion is connected to the knob portion of the operation handle and the RESET side edge of the opening portion of the case cover. The operation handle and the lock member are prevented from moving to the RESET side.
(2) The stopper is a protrusion protruding from the cap portion of the lock member along the RESET side surface of the case cover, and prevents the lock member from falling to the RESET side due to an external force load when attached to the operation handle. (Claim 3).
(3) The stopper protrudes from the tip of the lock plate of the lock member and engages with the ON side edge of the opening of the case cover. When the lock member is attached to the operation handle, the lock member receives an external force and moves toward the RESET side. The fall is prevented (claim 4).

  According to the above configuration, even when an external force is applied to the lock member of the handle lock device in the RESET direction of the handle lock device while the handle lock device is mounted on the knob of the operation handle, the protrusion protruding from the lock member is applied. The protrusion (stopper) of the case interferes with the opening of the case cover or the cover surface to prevent the lock member from moving or falling in the RESET direction, thereby reliably preventing the handle lock device from being easily detached from the operation handle.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. FIG. 1 is a diagram showing a state in which an operation handle equipped with a handle lock device is locked in an OFF position, and FIGS. 2A and 2B show a stopper piece of the handle lock device in a “lock” position and “open”. It is the state figure set to the position, The same code | symbol is attached | subjected to the member corresponding to FIG. 4, FIG. 5, and the description is abbreviate | omitted.

  That is, the handle lock device 5 of the illustrated embodiment is basically an assembly of the lock member 6 and the stopper piece 7 as in the conventional structure shown in FIGS. As the support member, projections indicated by reference numerals 6e, 6f, and 6g are additionally formed.

  Here, the first protrusion 6e is a wall-like protrusion extending from the cap portion 6a to the base side (lower side), and when the handle lock device 5 is attached to the knob portion 3a at the OFF position of the operation handle 3. As shown in FIG. 1, the protrusion 6e fits into the opening 2a of the case cover 2 and fills the gap gap (see FIG. 5) between the knob 3a and the edge of the opening on the RESET side.

  The second protrusion 6f is a rib-like protrusion that protrudes from the cap portion 6a to the RESET side (load side of the circuit breaker). When the handle lock device 5 is attached to the operation handle 3, the protrusion 6f is It protrudes along the outer surface of the case cover 2 beyond the gap.

  Further, the third protrusion 6g is formed at the tip of the lock plate that protrudes from the cap portion 6a to the ON side (the power supply side of the circuit breaker) opposite to the protrusion 6f. 3, the projection 6 g engages with the inside of the ON side edge of the opening 2 a of the case cover 2.

  With the above configuration, in the handle lock state of FIG. 1, the first protrusion 6 e fits into the remaining gap between the knob 3 a of the operation handle 3 and the RESET side edge of the opening 2 a of the case cover 2. Fill the gap. Thereby, even if an external force is applied in the arrow P direction, the operation handle 3 and the handle lock device 5 are prevented from moving in the RESET direction.

  The second protrusion 6f protruding along the outer surface of the case cover 2 functions to prevent the handle lock device 5 from falling to the RESET side against an external force in the direction of arrow P. Further, the third protrusion 6g engaged with the ON-side edge of the opening 2a of the case cover 2 causes the handle lock device 5 to fall to the RESET side with respect to the external force in the direction of the arrow P, similarly to the second protrusion 6f. It works to prevent it.

  As a result, when the handle lock device 5 is attached to the knob 3a of the operation handle 3 with the circuit breaker in the OFF state, the operation handle 3 cannot be moved from the OFF position to either the ON side or the RESET side. Locked. Further, even if the handle lock device 5 is put in this locked state and an external force load is applied in the direction of arrow P, the lock member 6 is prevented from falling to the RESET side. As a result, it is possible to reliably prevent the engaging claw portion 7c of the stopper piece 7 engaged with the constricted step portion 3b of the handle knob 3a from coming off and the entire locking device from falling off the operation handle 3.

  In the illustrated embodiment, the lock member 6 is formed with the first, second and third protrusions 6e to 6g. However, it is not always necessary to form all three protrusions, for example, the first to third protrusions. The same effect can be obtained even if one of 6e to 6g, or the combination of the protrusion 6e and the protrusion 6f or the protrusion 6e and the protrusion 6g is implemented.

1 is a configuration diagram of a handle lock device according to an embodiment of the present invention, and is a side cross-sectional view of a state in which a handle lock device is mounted on a handle knob at an OFF position of an operation handle. 1A and 1B are diagrams showing a state in which a stopper piece is set at a “lock” position and an “open” position, respectively. External perspective view of circuit breaker Side view sectional view showing a state before a handle lock device having a conventional structure is mounted on an operation handle of a circuit breaker 4 is a side sectional view showing a state of a handle lock in which the handle lock device of FIG. 4 is mounted on a knob portion of an operation handle.

Explanation of symbols

2 Case cover 2a Opening part 3 Operation handle 3a Knob part 3b Constriction step part 5 Handle lock device 6 Lock member 6a Cap part 6b Locking hole 6c Support shaft 6d Guide groove 6e 1st protrusion 6f 2nd protrusion 6g 3rd Protrusion 7 Stopper piece 7a Locking hole

Claims (4)

A handle lock device for a circuit breaker that locks a rocker-type operation handle having a knob protruding outward through an opening of a case cover to an OFF position. A lock member in which a plate with a locking hole projects from the cap portion toward the ON side edge of the opening portion of the case cover integrally with the cap portion to be fitted to the cap portion, , And a stopper piece with a locking hole provided with a claw portion which is supported to be tiltable to an “open” position and engages with a knob portion of an operation handle in a “lock” position,
A handle lock device for a circuit breaker comprising a stopper for preventing the lock member from coming off and preventing the handle from moving and tilting in the RESET direction by protruding from the lock member. 2. The handle lock device according to claim 1, wherein the stopper protrudes from the cap portion of the lock member to the base side thereof, and when the handle is mounted on the operation handle, the knob of the operation handle and the RESET side edge of the opening of the case cover A handle lock device for a circuit breaker, characterized in that it is a protrusion that fits into a gap therebetween. 2. The handle lock device according to claim 1, wherein the stopper is a protrusion protruding from the cap portion of the lock member along the RESET side surface of the case cover. 2. The handle lock device according to claim 1, wherein the stopper is a protrusion that protrudes from a front end of the lock plate of the lock member and engages with an ON side edge of the opening of the case cover when mounted on the operation handle. Circuit breaker handle lock device.

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