Motorized lock actuators
First Claim
Patent Images
1. A motorized lock actuator adapted for installation in a lockset, the motorized lock actuator comprising:
- an electrically insulated motor housing;
a motor mounted in the motor housing, the motor having a motor shaft, the motor shaft and motor being electrically isolated from the lockset by the electrically insulated motor housing to prevent electrostatic discharge through the motor;
a key cam;
a locking slide assembly including a locking a cylindrical container formed of plastic sliding within the key cam, the cylindrical container having a locking member projecting therefrom;
a locking rod spring contained within the cylindrical container of the locking slide assembly, the locking rod spring having two free ends;
a locking rod shaft extending through the locking rod spring and having a radial projection for threadedly engaging the locking rod spring;
a flexible alignment spring extending between the motor shaft and the locking rod shaft; and
the locking assembly sliding on the locking rod shaft, when the locking assembly is unobstructed, between a locked position when the locking rod shaft is rotated in a first direction and an unlocked position when the locking rod shaft is rotated in an opposite direction;
the locking rod spring being sufficiently compressed by the rotation of the locking rod shaft when the locking assembly is obstructed to subsequently move the locking assembly between the locked and the unlocked position when the locking assembly becomes unobstructed.
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Abstract
A motorized lock actuator adapted to replace a mechanical lock actuator in preexisting and installed lock assemblies to convert them to electronic operation includes an electrically insulated motor housing and at least one electrically insulated bushing on the motor shaft to prevent electrostatic discharge and EMI/RFI interference from damaging the electronic lock controller. An alignment spring is used to improve operation in misaligned lock assemblies, and a key cam of self lubricating and electrically insulating plastic provides reliable low friction operation for a sliding locking slide assembly.
71 Citations
24 Claims
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1. A motorized lock actuator adapted for installation in a lockset, the motorized lock actuator comprising:
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an electrically insulated motor housing; a motor mounted in the motor housing, the motor having a motor shaft, the motor shaft and motor being electrically isolated from the lockset by the electrically insulated motor housing to prevent electrostatic discharge through the motor; a key cam; a locking slide assembly including a locking a cylindrical container formed of plastic sliding within the key cam, the cylindrical container having a locking member projecting therefrom; a locking rod spring contained within the cylindrical container of the locking slide assembly, the locking rod spring having two free ends; a locking rod shaft extending through the locking rod spring and having a radial projection for threadedly engaging the locking rod spring; a flexible alignment spring extending between the motor shaft and the locking rod shaft; and the locking assembly sliding on the locking rod shaft, when the locking assembly is unobstructed, between a locked position when the locking rod shaft is rotated in a first direction and an unlocked position when the locking rod shaft is rotated in an opposite direction; the locking rod spring being sufficiently compressed by the rotation of the locking rod shaft when the locking assembly is obstructed to subsequently move the locking assembly between the locked and the unlocked position when the locking assembly becomes unobstructed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrically operated lockset comprising:
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an electronic lock controller having an output for controlling a motor to rotate in a first direction to lock the electrically operated lockset and an opposite direction to unlock the electrically operated lockset; a mechanical lockset capable of being locked and unlocked by a lock actuator; and a motorized lock actuator fitted within the mechanical lockset, the motorized lock actuator comprising; an electrically insulated motor housing; a motor having a motor case, the motor being connected to the output of the electronic lock controller and the motor case being mounted in the motor housing, the motor having a motor shaft, the motor shaft and motor case being electrically isolated from the mechanical lockset by the electrically insulated motor housing to prevent electrostatic discharge through the motor to the electronic lock controller; a key cam; a locking slide assembly including a cylindrical container formed of plastic sliding within the key cam, the cylindrical container having a locking member projecting therefrom; a locking rod spring contained within the cylindrical container of the locking slide assembly; a locking rod shaft extending through the locking rod spring and having a radial projection for engaging the locking rod spring; and the locking slide assembly being slidable on the locking rod shaft between a locked position in which the locking member is positioned to lock the lockset and an unlocked position in which the locking member is positioned to unlock the lockset. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An electrically operated lockset comprising:
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an electronic lock controller; a mechanical lockset modified by removing a mechanical lock actuator from within the mechanical lockset; and a motorized lock actuator fitted within the mechanical lockset to replace the removed mechanical lock actuator, the motorized lock actuator comprising; an electrically insulated motor housing; a motor connected to the electronic lock controller and mounted in the motor housing, the motor having a motor shaft, the motor shaft and motor being electrically isolated from the mechanical lockset by the electrically insulated motor housing to prevent electrostatic discharge through the motor to the electronic lock controller; a key cam; a locking slide assembly including a cylindrical container formed of plastic sliding within the key cam, the cylindrical container having a locking member projecting therefrom; a locking rod spring contained within the cylindrical container of the locking slide assembly, the locking rod spring having two free ends; a locking rod shaft extending through the locking rod spring and having a radial projection for engaging the locking rod spring; and the locking assembly being slidable on the locking rod shaft between a locked position in which the locking member is positioned to lock the lockset and an unlocked position in which the locking member is positioned to unlock the lockset. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification