Electro-mechanical latch relay

Details Electro-mechanical latch relay Electro-mechanical latch relay

2000-02-25

2001-04-17

Barrera, Ray (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Multiple contact type

C335S127000, C335S138000, C335S167000, C335S171000, C335S189000

Reexamination Certificate

active

06218918

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a mechanical latch relay started by a latch current pulse, and more particularly, a relay having a mechanical locking means for keeping the operation states provided by the current pulse.
BACKGROUND OF THE INVENTION
At present, most of the commercial relays, when provided with an operation current, can change their output states, e.g. from “on” to “off” or from “off” to “on”, and will return to their original states when the current provided disappears. In order to maintain the changed states, the current must be provided constantly. An improved relay is on the market to overcome this drawback which needs only a single pulse to keep the changed state. The most relative prior art is the latch relay manufactured by COLE HERSEE CO., U.S.A., but it is complicated, large, and unstable in operation since it requires three springs.
SUMMARY OF THE INVENTION
The present invention provides at least a mechanical latch relay activated by a latch current pulse in which a mechanical locking means allows an operating current to maintain its present operating state of the latch relay when the latch current pulse is removed and changes its operating state of the latch relay when another latch current pulse is provided, and then keeps the new operating state when the latch current pulse is removed thereby eliminating the necessity to continuously provide the latch current pulse for a particular operating state.
The present invention further provides at least a mechanical latch relay started activated by a latch current pulse, which provides a stable operating state of on/off current for effective control of on/off current.
The present invention further provides at least a mechanical latch relay started by a very short latch current pulse.
The present invention further provides at least a mechanical latch relay which is convenient to operate, time and energy efficient, simple in structure, cheap to manufacture, and which may enable large current.
To achieve the above objects, the present invention provides a mechanical latch relay comprising a casing with two connecting holes on a side thereof for receiving a latch current pulse metal plates on a bottom thereof for connecting to an external circuit a cavity including at a center of the bottom side grooves and a cover on an upper end thereof; an electromagnetic generating unit, a connecting means and a locking means housed within said casing, said electromagnetic generating unit includes a coil assembly for generating an electromagnetic field including a central bore and a rotor spring positioned in said central bore; said connecting means includes a connecting plate having a bolt on one side of said connecting plate and a columnar rotor which is inserted into said rotor spring on the other side thereof, said locking means comprises a small spring positioned in said cavity a locking component placed on said small spring and a clamping part with clamping tabs; said locking component is a cylinder having teeth at one end thereof for engaging with said clamping tabs and a gear on the periphery thereof for engaging with side grooves of said cavity.
The advantages of the present invention lie in that it can provide a stable operating state for on/off current, and it enables an effective control for on/off current. Moreover, since the metal plate for connecting with an external circuit is made of special material, the range of output current is greatly extended, e.g. from 0 to 250 A.


REFERENCES:
patent: 2892059 (1959-06-01), Keirans
patent: 3873951 (1975-03-01), Blake
patent: 4725801 (1988-02-01), Snyder
patent: 0630034A1 (1994-12-01), None

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