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US 4,503,411 AGranted
Dual plunger solenoid device
AssigneeCooper Industries, Inc.
InventorWarren A. Lofstrand
Life of this patent
Estimating the term…
Abstract
A solenoid-operated plunger device comprising a frame and a solenoid coil contained within the frame. Two or more movable plungers, separated by a barrier, are located within the solenoid coil. The plungers project the ends of the solenoid coil, and are slidable within the solenoid coil on parallel axes. A return spring is connected to each plunger for controlling the movement of the plunger.
Claims20
A solenoid-operated plunger device comprising:
- (a) a frame;
- (b) a solenoid coil contained within the frame;
- (c) two or more movable plungers located within the solenoid coil and projecting from the ends of the solenoid coil, the plungers being independently slidable within the solenoid coil on parallel axes;
- (d) a return spring connected to each plunger for controlling the movement of the plunger;
- and
- (e) a barrier separating the plungers.
3 more elements
A solenoid-operated plunger device comprising:
- (a) a frame;
- (b) a solenoid coil contained within the frame;
- (c) two movable plungers located within the solenoid coil and projecting from the ends of the solenoid coil, the plungers being independently slidable within the solenoid coil on parallel axes;
- (d) a return spring connected to each plunger for controlling the movement of the plunger, each return spring having a different spring constant;
- and
- (e) a barrier separating the plungers.
3 more elements
Dependencies are inferred from the claim text.