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US 10,504,667 B2Granted
Spring operated actuator
AssigneeABB Schweiz AG
InventorsJohannes Tredoux, Daniel Staffas
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AssigneeABB Schweiz AG
InventorsJohannes Tredoux, Daniel Staffas
Estimating the term…
Actuator and electric switching apparatus including a spring to provide movement of the apparatus and a rotary air damper. The damper is arranged to decelerate the spring during at least an end portion of movement. The damper has a toroidal working chamber formed by two circumferential housing parts rotatable relative to each other. Each housing part has internal walls which together define the working chamber. The first housing part has a rotatable displacement wall, sealingly rotatable in the working chamber. The second housing part has a stationary end wall of the working chamber. The second housing part has one recess in its internal walls. The recess is located less than 90° ahead the end wall as seen is the rotational direction of the displacement wall at an actuating movement. The recess has an extension in the circumferential direction that is larger than the effective thickness of the displacement wall. Alternatively the recess is on the first housing part.
A spring operated actuator for an electric switching apparatus including an actuation spring to provide an actuating movement of the switching apparatus and a rotary air damper connected to the actuation spring, the damper is arranged to decelerate the spring movement during at least an end portion of the actuating movement, the damper having a toroidal working chamber formed by first and second circumferential housing parts which are rotatable relative to each other, each housing part having internal walls which together define the working chamber, the first housing part having a rotatable displacement wall, sealingly rotatable in said working chamber, the second housing part having a stationary end wall of the working chamber, wherein at least one of said housing parts is provided with at least one recess in its internal walls, the recess when provided in the second housing part is located less than 90° ahead the end wall as seen is the rotational direction of the displacement wall at an actuating movement, and the recess in the second housing part has an extension in the circumferential direction that is larger than the effective thickness of the displacement wall, and the recess when provided in the first housing part is located less than 90° ahead the displacement wall as seen in the rotational direction of the displacement wall at an actuating movement, and the recess in the first housing part has an extension in the circumferential direction that is larger than the effective thickness of the end wall.
An electrical switching apparatus including a spring operated actuator to provide an actuating movement of the switching apparatus and a rotary air damper connected to the actuation spring, the damper is arranged to decelerate the spring movement during at least an end portion of the actuating movement, the damper having a toroidal working chamber formed by first and second circumferential housing parts which are rotatable relative to each other, each housing part having internal walls which together define the working chamber, the first housing part having a rotatable displacement wall, sealingly rotatable in said working chamber, the second housing part having a stationary end wall of the working chamber, wherein at least one of said housing parts is provided with at least one recess in its internal walls, the recess when provided in the second housing part is located less than 90° ahead the end wall as seen is the rotational direction of the displacement wall at an actuating movement, and the recess in the second housing part has an extension in the circumferential direction that is larger than the effective thickness of the displacement wall, and the recess when provided in the first housing part is located less than 90° ahead the displacement wall as seen in the rotational direction of the displacement wall at an actuating movement, and the recess in the first housing part has an extension in the circumferential direction that is larger than the effective thickness of the end wall.
Dependencies are inferred from the claim text.