Door actuator
First Claim
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1. 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.
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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.
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Citations
7 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
Specification