Drawout type switchgear including lock member to allow circuit breaker to be positioned in three locked positions
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTakayoshi Ishikawa
Life of this patent
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Abstract
The sliding mechanism (50) of a drawout type switchgear has a first slide arm (5) which is slidably supported by the upper and lower support rails (3A, 3B) and a second slide arm (7) which is slidably supported by the first slide arm (5). The second slide arm (7) is interlocked with the first slide arm (5) by a lock plate (12) when the first slide arm (5) is sliding from a connected position to a final drawout position of the first slide arm (5). When the first slide arm (5) reaches the final drawout position of the first slide arm (5), the interlocked second slide arm (7) is released by rotation of the lock plate (12).
Claims17
A drawout type switchgear comprising:
- a base frame having at least one side plate,
- a circuit breaker, which is movably mounted on said base frame, and which is to be locked at plural positions of a connected position, a disconnected position and a drawout position,
- an upper and a lower support rail mounted on said at least one side plate of said base frame,
- a first slide arm which is slidably supported by said upper and lower support rails,
- a second slide arm which is slidably supported by said first slide arm, and which is fixed to said circuit breaker, and
- at least one lock member which locks said second slide arm to said first slide arm until said first slide arm reaches a final drawout position of said first slide arm, and which releases by coming off said lower support rail.
A drawout type switchgear comprising:
- a base frame having at least one side plate, said at least one side plate comprising means defining a recess having a projection;
- a circuit breaker, which is movably mounted on said base frame, and which is to be locked at plural positions of a connection position, a disconnected position and a drawout position,
- at least one slide arm which is slidably supported by said at least one side plate of said base frame so as to hold said circuit breaker, and
- a lock lever unit which is provided on said at least one slide arm;
- biasing means for biasing said lock lever unit in a first direction;
- said lock lever unit comprising a first end engaging with said projection when said circuit breaker is disposed at said disconnected position to prevent rotation of said lock lever unit in a second direction opposite to said first direction and thereby to prevent further outward movement of said circuit breaker in the drawout direction.
A drawout type switchgear comprising:
- a base frame having at least one side plate,
- a circuit breaker, which is movably mounted on said base frame, and which is to be locked at plural positions of a connected position, a disconnected position and a drawout position,
- an upper and a lower support rail mounted on said at least one side plate of said base frame,
- a first slide arm which is slidably supported by said upper and lower support rails,
- a second slide arm which is slidably supported by said first slide arm, and which is fixed to said circuit breaker, and
- at least one lock member for locking said second slide arm to said first slide arm until said first slide arm reaches a final drawout position and for engaging with an upper surface of said lower support rail for locking said second slide arm in an extended position corresponding to the drawout position of said circuit breaker until said second slide arm is slid to abut said locking member causing said locking member to come off said lower support rail to release said locking member.
Dependencies are inferred from the claim text.