Electric transfer switch unit
AssigneeIse Corporation
InventorsKatsuhiro Yoshida, Hisayuki Nagase
Life of this patent
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Abstract
An electric transfer switch unit for selective connection to different power supplies is provided with moveable contacts, associated stationary contacts connected to said power supplies, a turnable drive handle and a toggle mechanism for connecting the drive handle to the moveable contacts. The toggle mechanism includes a spring system adapted for storing and releasing mechanical energy upon turning of the drive handle. Use of the spring system assures swift and stable turning of the drive handle for shifting between the different power supplies.
Claims13
An electric transfer switch unit for selective connection to different power supplies comprising
- at least one moveable contact,
- two associated stationary contacts electrically connected to said different power supplies,
- a turnable drive handle,
- a toggle mechanism arranged between said drive handle and said moveable contact in order to convert turning of said drive handle into corresponding shift of said moveable contact between two separate closed positions for contact with said stationary contacts, and
- a spring system incorporated in said toggle mechanism to store mechanical energy when said drive handle is turned in one direction and to release stored mechanical energy when said drive handle is turned in the other direction for shift in closed position.
An electric transfer switch unit for selective connection to different power supplies comprising
- a crossbar mounted to a frame in a rotatable arrangement about its own longitudinal axis,
- a drive handle secured to said crossbar for shifting between first, second and third positions,
- link arms secured to said crossbar whilst extending laterally and symmetrically with respect to said longitudinal axis of said crossbar,
- a pair of extensible links arranged symmetrically with respect to said longitudinal axis, each being pivoted at one end to an associated one of said ling arms and, at the other end, to said frame, and
- a coil spring inserted over each said extensible link,
- said switch unit shifting from said first to second position past said third position when said drive handle is turned in a first direction and a pivot at said one end of said extensible link traverses, in a first direction, a straight line connecting both ends of said extensible link to said longitudinal axis of said crossbar, and
- said switch unit shifting from said second to first position past said third position when said drive handle is turned in a second direction opposite to said first direction and said pivot traverses said straight line in a second direction opposite to said first direction.
An electric transfer switch unit provided with a toggle mechanism for shifting an electric load to a first position connected to a first power supply, a second position connected to a second power supply and a third position without connection to any power supply,
- said toggle mechanism being provided with
- (a) a crossbar mounted to a frame in an arrangement rotatable about its own longitudinal axis,
- (b) a drive handle secured to said crossbar for shifting said switch unit to said first position, said second position and said third position located between said first and second positions, said three positions being located around said longitudinal axis of said crossbar,
- (c) link arms secured to said crossbar and extending symmetrically on both sides of said longitudinal axis whilst traversing said longitudinal axis,
- (d) a pair of extensible links pivoted at one ends to associated link arms and pivoted, at the other ends located symmetric with respect to said longitudinal axis, to said frame, and
- (e) a coil springs inserted over an associated extensible link for urging said extensible link in a direction of extension,
- said switch unit shifts from said first position to said second position past said third position when said drive handle is turned in one direction and one pivot of said extensible link traverses a straight line connecting pivots on both ends of said extensible link to said longitudinal axis of said crossbar, and
- said switch unit shifts from said second position back to said first position past said third position when said handle is turned in the other direction and said one pivot of said extensible link traverses said straight line in an opposite direction.
Dependencies are inferred from the claim text.