Actuator for an elevator brake

An electromechanical actuator for attachment to a travel body of an elevator installation and for actuating an elevator brake of the travel body, the actuator comprising:

• an energy store;
• a retaining device;
• a resetting device;
• and
• a connecting element connecting the actuator with the elevator brake,
• wherein the resetting device acting through the retaining device at least one of retains the energy store and the connecting element in a first operating position corresponding with a readiness setting of the brake and returns the energy store to the first operating position,
• wherein the energy store upon release of the retaining device acts on the connecting element to actuate the brake into an applied setting,
• wherein the energy store includes a rear abutment and has an impact buffer so that when the energy store impinges in an end position, the end position determined by the rear abutment, recoil is reduced,
• wherein the enemy store includes a first part, a second part and a first spring with a first spring stressing force, wherein the first spring is compressed between the first and second parts, wherein the first part and the second part are displaceable relative to one another over a displacement range and the displacement range is bounded by at least one of a front abutment and the rear abutment and the at least one abutment ensures a minimum first spring stressing force, wherein the impact buffer is integrated into one of the first and second parts, and wherein the one of the first and second parts includes a first sub-member and a second sub-member and the impact buffer connects the first sub-member with the second sub-member,
• wherein the impact buffer includes a spring arrangement with a second spring stressing force, which spring arrangement connects the first sub-member with the second sub-member and holds the first and second sub-members together, and wherein the second spring stressing force is set to a greater value than the first spring stressing force, and
• wherein one of the first and second sub-members includes a threaded plate and another one of the first and second sub-members includes an impact plate and the spring arrangement tightens the impact plate relative to the threaded plate by a draw screw.