Commonized actuator for normally open and normally closed modes

Details Commonized actuator for normally open and normally closed modes Commonized actuator for normally open and normally closed modes

2003-03-05

2004-09-07

Donovan, Lincoln (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

C335S251000, C335S220000

Reexamination Certificate

active

06788177

ABSTRACT:

BACKGROUND ART
1. Field of the Invention
The invention relates to an electromagnetic actuator. More specifically, the invention relates to an electromagnetic actuator that can be configured in a normally open configuration or a normally closed configuration to push or pull a device.
2. Description of the Related Art
Actuators are used to move devices, or elements thereof, between positions of operation. By way of example, an actuator may move a switch from an open condition to a closed condition. Actuators may also move elements between a plurality of positions. In the case where an actuator operates a valve, a valve may move between open and closed positions. In addition, the actuator may move the valve to a plurality of positions between the open and closed position to regulate a flow of material, i.e., fluid flow, as it passes through the valve by varying the size of the opening created within the valve.
A typical actuator used to automatically move a switch or a valve between conditions is an electromagnetic actuator. While operating under the same principle, an electromagnetic actuator that is designed to be normally open is conceptually different in its layout or design from an electromagnetic actuator that is designed to operate in a normally closed condition. Because the normally open actuator and the normally closed actuator are designed differently, the part designs for each of the actuators varies depending on the type of actuator being used. Because the designs are different, inventory for several parts is required. By increasing the number of parts, costs associated with inventory and assembly for such actuators are increased. In addition, errors in part selection increase as the multiple of part combinations grows due to the increased number of parts based on what condition a particular actuator is to be operating in.
SUMMARY OF THE INVENTION
An actuator assembly operates a device in a normally open mode and a normally closed mode. The actuator assembly includes a frame that extends between a first ridge and a second ridge. A primary plate is adapted to be secured to either the first ridge or the second ridge. The primary plate includes a primary hole. A secondary plate is adapted to be secured to either the first ridge or the second ridge, opposite the end to which the primary plate is secured. The secondary plate includes a secondary hole. A bobbin defining a longitudinal axis extends between the primary and secondary plates. A coil wound around the bobbin receives an electrical current to induce a magnetic field thereabout. A rod extends from within the frame to a device along the longitudinal axis. The rod is movable along the longitudinal axis in response to the magnetic field to open and close the device. The actuator assembly also includes a plunger extending through a portion of the bobbin. The plunger is movable with respect thereto in response to changes in the magnetic field. The plunger includes a rod receptacle for fixedly securing the rod therein allowing the rod to move with the plunger. The plunger is adapted to be oriented in a first orientation allowing the actuator assembly to operate the device in the normally open mode and a second orientation allowing the actuator assembly to operate the device in the normally closed mode.


REFERENCES:
patent: 3683239 (1972-08-01), Sturman
patent: 3806850 (1974-04-01), McFarlin
patent: 4679017 (1987-07-01), Mishler et al.
patent: 6486762 (2002-11-01), Kurasawa et al.
patent: 6578933 (2003-06-01), Hageman et al.

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