Solenoid apparatus having a plunger with an internal passage and

Details Solenoid apparatus having a plunger with an internal passage and Solenoid apparatus having a plunger with an internal passage and

1996-08-29

1998-06-30

Gellner, Michael L.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Combined with diverse-type art device

335239, 335240, 335255, 335260, 335261, H01F 100

Patent

active

057740330

ABSTRACT:
Solenoid apparatus having a substantially cylindrical casing, an electro-magnetic coil, a plunger axially aligned and slideably mounted to the casing, a housing hermetically mounted to an end of the casing and a vacuum source operatively coupled to the external port. The plunger has a first end extending outside of the casing, a second end and an internal passage extending from the first end to the second end. The electro-magnetic coil is selectively energizeable for moving the plunger between a first position and a second position. The housing corresponds to the plunger second end to define an inner chamber which encloses the plunger second end. The housing includes an external port connected to the inner chamber so as to provide an unobstructed pathway from the external port to the first end of the plunger via the internal passage and the inner chamber regardless of whether the plunger is in the first position, the second position or therebetween. The vacuum source is selectively activatable for generating negative pressure at the first end of the plunger via the inner chamber and the internal passage.

REFERENCES:
patent: 747853 (1903-12-01), Cheyney
patent: 1341629 (1920-06-01), Brown
patent: 2698404 (1954-12-01), Edwards
patent: 2757321 (1956-07-01), Wallace et al.
patent: 2886720 (1959-05-01), Buck
patent: 4087773 (1978-05-01), Jencks et al.
patent: 5389910 (1995-02-01), Abel
patent: 5402093 (1995-03-01), Gibas et al.

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