Locking apparatus for a drawer type circuit breaker
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKeiji Kobayashi, Yoshimi Fujii
Life of this patent
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Abstract
A locking apparatus for a drawer type circuit breaker that restricts movement from the test/disconnection position to the operation position on a switchboard. The locking apparatus has a connection sensor for detecting the connection of a switchboard side plug into a drawer type circuit breaker plug. A switchboard-mounted stopper contacts a lock pin mounted to the drawer type circuit breaker when the connection sensor fails to detect a connection between the plugs. The drawer-type circuit breaker has a mounted lock lever for securing the plugs together. The locking apparatus also has an access-inhibiting plate for preventing operator access to the plugs when the circuit breaker is between the test/disconnection position and the operation position.
Claims14
A locking apparatus for a drawer type circuit breaker, said circuit breaker moving on a switchboard and stopping at a disengage position and a engage position, said locking apparatus being mounted and having a first plug inserted into a second plug on the switchboard for establishing an electrical connection between said circuit breaker and said switchboard, said locking apparatus comprising:
- plug-connection sensing means for sensing a connection of said first plug into said second plug;
- lock means for locking said first plug inserted into said second plug when said lock means is at a lock position thereof, and for unlocking when said lock means is at an unlock position thereof;
- a stopper fixed on said switchboard;
- a lock pin drivingly connected to said plug-connection sensing means and said lock means, said lock pin moving to a contact position to contact the stopper to inhibit advancement of the circuit breaker from said disengage position to said engage position when said plug-connection sensing means does not detect that said first and said second plugs are connected with each other, while at the same time said lock means locks said first plug, and lock pin moving to a non-contact position to move out of contact with said stopper so that the circuit breaker is allowed to move from said disengage position to said engage position when said plug-connection sensing means detects that said first and second plugs are connected with each other while at the same time said lock means locks said first plug;
- and
- access-inhibiting means for inhibiting an operator to access to said first and second plugs when said circuit breaker is between said disengage position and said engage position.
A locking apparatus for a drawer type circuit breaker, said locking apparatus comprising a position sensing pin provided on a switchboard so that said circuit breaker senses a location of said position sensing pin on said switchboard, and an access-inhibiting means, said access-inhibiting means further including:
- an access-inhibiting plate movable between an occlude position where said access-inhibiting means advances over a lock means to make plugs inaccessible to an operator and a non-occlude position where said access-inhibiting plate retreats from said lock means to make said plugs accessible to the operator;
- and
- a position-sensing lever having a first end portion and a second end portion, said position-sensing lever being rotatably supported at said first end portion and being urged in a first direction;
- wherein when said circuit breaker moves from a disengage position to an engage position, said second end portion of said position sensing lever contacts said position-sensing pin, rotating said position sensing lever in a second direction opposite to said first direction driving said access-inhibiting means from said non-occlude position to said occlude position so as to displace said lock means making said plugs inaccessible to an operator.
Apparatus for regulating the electrical engagement of a drawer type circuit breaker to a switchboard comprising:
- means for electrically connecting said drawer type circuit breaker to an electrical load;
- means for mechanically securing said electrically connecting means to said drawer type circuit breaker while said drawer type circuit breaker is electrically engaged to said switchboard;
- means for inhibiting electrical disconnection of said electrically connecting means while said drawer type circuit breaker is electrically engaged to said switchboard;
- means for sensing an electrical connection between said drawer type circuit breaker and said electrical load;
- means for sensing the mechanical securing of said electrically connecting means by said mechanically securing means;
- and,
- means for preventing said electrical engagement of said drawer type circuit breaker to said switchboard when said mechanically securing means is unsecure or when said electrical connection sensing means is not sensing the electrical connection between said drawer type circuit breaker and said electrical load.
Dependencies are inferred from the claim text.