Imported: 23 Feb '17 | Published: 22 Oct '02
USPTO - Utility Patents
A switch assembly comprises a switch knob, a contact control member, a resilient contact piece and a bimetal alloy leaf for automatically cutting off power supply when current overload occurs. The switch knob is depressed to drive a protuberance to directly press or release the contact control member and the resilient contact piece to connect or cut off the power supply in normal operation. When current overload occurs, the bimetal alloy leaf deformed to push a moveable rod of the contact control member to release the resilient contact piece for cutting off the power supply. The switch assembly also includes a resilient member for restoring the contact control member to a normal off state after cutting off the power supply.
BRIEF DESCRIPTION OF THE DRAWINGS
The related drawings in connection with the detailed description of this invention, which is to be made later, are described briefly as follows, in which:
FIG. 1 is an exploded view of an embodiment of this invention in three dimensions;
FIG. 2 is a cutaway sectional view showing the embodiment of this invention under OPEN (OFF) state;
FIG. 3 is a cutaway sectional view showing the embodiment of this invention under CLOSE (ON) state;
FIG. 4 is a cutaway sectional view of the embodiment of this inventiion showing response of an alloy leaf in case of overload; and
FIG. 5 is a cutaway sectional view of the embodiment of this invention illustrating that a contact control member drops to cut off power supply in case of overload.
1. A switch assembly comprising:
2. The switch assembly as claimed in claim 1, wherein said resilient member is a stretchable spring.
3. The switch assembly as claimed in claim 1, further comprising an upright longitudinal slot formed in said contact control member and a stationary supporting pin disposed in said casing, wherein said stationary supporting pin is positioned within said upright longitudinal slot and said contact control member is movably constrained upwards or downwards by said upright longitudinal slot.
4. The switch assembly as claimed in claim 1, wherein said movable rod has one end formed with a flange for coupling to said resilient component.
5. The switch assembly as claimed in claim 1, wherein said thermal-sensitive alloy leaf has two top ends fixedly jointed to upper ends of said first and second circuit link members respectively.
6. The switch assembly as claimed in claim 1, wherein said resilient component is a compressible spring.