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US 8,938,912 B2Granted
Door actuator
AssigneeSchlage Lock Company LLC
InventorsAaron Patrick McKibben, Brian Christopher Eickhoff
Life of this patent
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Abstract
A power boost assembly is disclosed that can be used with a door actuator, such as a door closer. The power boost assembly is structured to store an energy during a first movement of a door and release the stored energy during a second movement of the door. In one form the power boost assembly can be structured as a module that can be added to an existing door and door closer installation. In one form the power boost assembly is used to increase a closing force imparted to a door to ensure a latching event.
Claims7
An apparatus comprising:
- a door actuator having a pinion configured to be attached to an arm of a door and rotatable about a pinion axis, the pinion capable of transmitting a power to open and close the door, the door actuator further having:
- a door actuator spring structured to store an energy from the pinion when the door is opened;
- a main cam configured to rotate with the pinion;
- and
- a energy storage device and release member in a work communication with the main cam structured to store an energy in the energy storage device upon a first rotation of the main cam and release the stored energy from the energy storage device through operation of the release member upon a second rotation of the main cam;
- wherein a range of motion of the first rotation over which the main cam engages the energy storage device to create the stored energy is larger than a range of motion of the second rotation over which the energy storage device releases the stored energy to the main cam.
3 more elements
Dependencies are inferred from the claim text.