Latching operating mechanism of a three-position circuit breaker
OwnerRobert Micoud, Michel Berneinventors
Life of this patent
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Abstract
A latching mechanism comprises an energy storage system having a first closing spring, and a second opening and earthing spring, arranged between a transmission device and a closing control crankshaft and an earthing crank. A retaining plate pivoting on an axis cooperates on the one hand with an opening control lock by means of a unidirectional locking and on the other hand with the crankshaft by means of two latchings. The first latching is released during the opening travel after the lock has been unlocked, and the second latching causes positive locking of the device at the beginning of the closing travel of the crankshaft.
Claims7
An operating mechanism of an electrical switchgear device, especially a multipole circuit breaker or a fuse-switch, incorporated in an electrical distribution cubicle, connected by means of connecting cables, the movable assembly of the circuit breaker being able to occupy three distinct stable positions, namely a first position F in which the contacts are closed, a second intermediate position O in which the contacts are open, and a third earthed position T in which the outgoing cables are electrically earthed by means of the movable contacts of the corresponding phases, the kinematic transmission system of said mechanism (10) comprising:
- an elastic energy storage system (12, 14), associated with a rotary transmission device (16) securedly united to the movable assembly,
- operating means (28, 68, 72, 74, 34) operating in conjunction with the energy storage system (12, 14) to actuate the transmission device (16) in one of the three positions, earthing being accomplished from the second intermediate position O,
- blocking means (46, 50, 52) of the transmission device (16) in each of the three positions F, O, T, of the circuit breaker,
- a first spring (12) of the energy storage system being arranged between a first drive pin (24) of the transmission device (16), and a crankshaft (28) wedged onto a shaft (36) extending parallel to the spindle (22) of the transmission device (16),
- a second spring (14) of the energy storage system being fitted between a second drive pin (30) of the transmission device (16) and an earthing control crank (34) mechanically connected to said blocking means,
- a pivoting retaining plate (44) cooperating on the one hand with an opening control lock (68) by means of a unidirectional locking (76, 78, and on the other hand with the crankshaft (28) by means of a first and a second latching (92, 100),
- said first latching (92) being released during the opening travel by the expansion action of the first spring (12), subsequent to the lock (68) being released,
- said second latching (100) being capable of occupying an active positive locking position of the transmission device (16) at the beginning of the closing travel of the crankshaft (28), and an inactive unlocking position of said device (16).
Dependencies are inferred from the claim text.