Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Reexamination Certificate
2002-06-07
2003-07-08
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
C335S255000, C335S273000
Reexamination Certificate
active
06590483
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an electromagnetic solenoid actuator and, more specifically, to an electromagnetic solenoid actuator which can bring an operation rod to a plurality of operation positions.
DESCRIPTION OF THE RELATED ART
The electromagnetic solenoid actuator generally comprises a cylindrical casing, an electromagnetic coil arranged in the casing, a fixed iron core arranged in the electromagnetic coil, a moving iron core arranged to come in contact with, and separate away from, the fixed iron core, and an operation rod mounted in the moving iron core. In this electromagnetic solenoid actuator, the operation rod can be brought to two operation positions only due to its structure, i.e., to an operation position of when no electric current is supplied to the electromagnetic coil and to an operation position of when an electric current is supplied to the electromagnetic coil.
An electromagnetic solenoid which can bring an operation rod to three or more operation positions has been disclosed in Japanese Unexamined Utility Model Publication (Kokai) No. 193607/1983. The electromagnetic solenoid disclosed in this publication comprises a plurality of electromagnetic coils, a plurality of fixed iron cores and moving iron cores, wherein an operation rod mounted in the moving iron cores is brought to a plurality of positions by selectively supplying an electric current to the plurality of electromagnetic coils.
However, the electromagnetic solenoid disclosed in Japanese Unexamined Utility Model Publication (Kokai) No. 193607/1983 is constituted by a plurality of electromagnetic coils, a plurality of fixed iron cores and moving iron cores, i.e., constituted by using many parts, resulting in an increase in the size and in the cost.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a compact and inexpensive electromagnetic solenoid actuator which can bring an operation rod to a plurality of operation positions without using electromagnetic coils, fixed iron cores and moving iron cores in a plurality of numbers.
In order to accomplish the above-mentioned object according to the present invention, there is provided an electromagnetic solenoid actuator comprising a cylindrical casing, an electromagnetic coil arranged in the casing, a fixed iron core arranged in the electromagnetic coil, a moving iron core arranged to come in contact with, and separate away from, the fixed iron core, and an operation rod mounted on the moving iron core, wherein provision is made of a position-limiting mechanism for limiting the operation rod to a plurality of operation positions according to a thrust produced by the operation rod in compliance with the amount of electric power fed to the electromagnetic coil.
The position-limiting mechanism comprises at least one moving ring arranged on the operation rod or on an interlocking rod operated by the operation rod so as to slide, a first spring member arranged between the moving ring and the operation rod or the interlocking rod, and a second spring member arranged between the moving ring and the casing.
The position-limiting mechanism further comprises a first ring arranged on the operation rod or on the interlocking rod operated by the operation rod and is limited from moving toward the side of the moving iron core, a second ring and a third ring arranged on the operation rod or on the interlocking rod so as to slide on the side of the first ring opposite to the moving iron core, a first compression coil spring arranged between the first ring and the second ring, a second compression coil spring arranged between the second ring and the casing, a third compression coil spring arranged between the second ring and the third ring, and a fourth compression coil spring arranged between the third ring and the casing, a spring force of the second compression coil spring being greater than the spring force of the first compression coil spring, and the spring force of the fourth compression coil spring being greater than the spring force of the third compression coil spring.
REFERENCES:
patent: 5422617 (1995-06-01), Brown
patent: 6265957 (2001-07-01), Baginski et al.
patent: 1 085 532 (2001-03-01), None
Antonelli Terry Stout & Kraus LLP
Barrera Ramon M.
Isuzu Motors Limited
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