Patent ID: 8410386

Claim:
A hydraulic stored-energy spring mechanism for a high-voltage circuit breaker, comprising: a stored-energy spring for generating pressure in a high-pressure store; a spring excursion switching including, a cam disk having a first circumferential region with at least one first radial extent, a second circumferential region with at least one second radial extent, the at least one second radial extent being greater than the at least one first radial extent, and a third circumferential region with at least one third radial extent and arranged in a circumferential direction between the first circumferential region and the second circumferential region, wherein the at least one third radial extent is greater than the at least one first radial extent and less than the at least one second radial extent, and a pushbutton having switching hysteresis and having at least one switching contact, for interacting with the cam disk such that when the pushbutton is acted upon through the first circumferential region, the switching contact assumes a first switching position, and when the pushbutton is acted upon through the second circumferential region, the switching contact assumes a second switching position, and when the pushbutton is acted upon through the third circumferential region, the switching contact maintains a previously assumed switching position; the spring excursion switch for interacting with the stored-energy spring such that the first circumferential region of the cam disk acts upon the pushbutton of the spring excursion switch when the stored-energy spring has reached a predetermined switch-off extent, and the second circumferential region of the cam disk acts upon the pushbutton of the spring excursion switch when the stored-energy spring has reached a predetermined switch-on extent.