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US 4,078,162 AGranted
Blade lock for electric switch
AssigneeTurner Electric Corporation
InventorJohn L. Turner
Life of this patent
Estimating the term…
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AssigneeTurner Electric Corporation
InventorJohn L. Turner
Estimating the term…
The invention provides an improved positive latch for high voltage, air break disconnect switches of the type having an elongated blade with one end swiveling on a terminal to switch its opposite end from the remote terminal, the blade being rotatable about its longitudinal axis and relative to the terminals and provided at its switching end with a transversely projecting contact lug shiftable by rotation of the blade into and out of frictional engagement with the remote terminal. The latch is pivotally mounted on the remote terminal and has a hook-like portion spring biased downwardly into latching position with respect to the end portion of the blade and is rotatable out of latching position by engagement with the latch of an arm carried by the blade when the contact lug is rotated out of engagement with the remote terminal and is formed with an extension engageable with the blade mounted latch operating arm for opening the latch as the blade approaches closed position.
In a high voltage air break disconnect switch, an elongated blade, a terminal at each end of said blade, means mounting the blade at its one end to swing about one terminal toward and away from the other terminal, a contact on the other end of said blade, said blade being rotatable about its longitudinal axis to shift said contact into and out of engagement with the other terminal when the blade is adjacent the other terminal, and a latch member pivoted to said other terminal on an axis parallel to said blade and having a hook portion positionable in the path of swinging movement of said other end of the blade toward open position to block such movement when said blade is in fully closed position, said blade having a radial arm fixed to its other end abuttingly engageable with said latch member, said radial arm being rotatable when said blade rotates about its axis out of contact with said other terminal for moving said latch member and the hook portion thereof out of the path of said blade to permit said blade to swing away from said other terminal.
Dependencies are inferred from the claim text.