SME overcurrent protective apparatus having ambient temperature

Details SME overcurrent protective apparatus having ambient temperature SME overcurrent protective apparatus having ambient temperature

1983-12-01

1985-05-14

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With longitudinally expansible solid element

H01H 6108, H01H 7114

Patent

active

045175438

ABSTRACT:
A shape memory effect (SME) spring (20) is thermally responsive to currents sensed in itself or in a heater element (66) to pivot an actuator (16) against a bias spring (22) to operate a switch (32) in response to sensed currents above a given level. The actuator (16), bias spring (22) and SME spring (20) are carried by a pivotally mounted support beam (12) which is driven by an ambient temperature compensation mechanism (40,52) to change the amount of switch actuating travel of the actuator (16) in response to ambient temperature changes. The ambient temperature compensation mechanism comprises a pivotal lever (42,54) translationally coupled (42a,54a, 12b) to the support beam (12). In a first embodiment the lever (42,54) is driven by a temperature sensitive bimetal (46), and in a second embodiment it is driven by a temperature sensitive SME spring (58) biased to a reference position by an adjustable (62) spring (60).

REFERENCES:
patent: 3634803 (1972-01-01), Willson et al.
patent: 3849756 (1974-11-01), Hickling
patent: 3858141 (1974-12-01), Lackey
patent: 3967227 (1976-06-01), Clarke et al.

Affiliated with

Also associated with

Rating

SME overcurrent protective apparatus having ambient temperature does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with SME overcurrent protective apparatus having ambient temperature , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SME overcurrent protective apparatus having ambient temperature will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-770876