Electrical generator or motor structure – Dynamoelectric – Linear
Reexamination Certificate
2000-01-13
2001-11-27
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Linear
C310S014000, C418S087000
Reexamination Certificate
active
06323568
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to electromagnetic vibrators which are particularly useful for driving linear-type pumps. The invention also relates to a leaf spring construction particularly useful in such electromagnetic vibrators.
Linear-type pumps, which include electromagnetic vibrators for reciprocating a plunger, generally provide a number of important advantages over rotary-type pumps, including the following: long life, low noise level, high efficiency, compact structure, smooth air flow, and simple maintenance eliminating the need for lubrication. In one type of linear pump, the pumping member driven by the electromagnetic vibrator is a diaphragm; and in a second type of linear pump, the pumping member is a piston. Generally speaking, electromagnetic vibrators suitable for driving diaphragms are not suitable for driving pistons unless they include low friction guiding bearings which constrain the movements of the plunger to longitudinal displacement. Such guiding bearings, however, increase wear and tear, and decrease efficiency.
One type of electromagnetic vibrator uses a plunger containing soft ferromagnetic material, and another type uses a plunger containing permanent magnets. Electromagnetic vibrators utilizing soft ferromagnetic material are generally less costly than those utilizing permanent magnets.
OBJECT AND BRIEF SUMMARY OF THE INVENTION
An object of the present invention is to provide a novel electromagnetic vibrator which can be constructed as a universal drive for driving either piston-type pumps, or diaphragm-pumps, as well other devices. Another object of the invention is to provide a linear pump including the novel electromagnetic vibrator; and a further object is to provide a leaf spring construction particularly useful in the novel electromagnetic vibrator of the present invention.
According to one aspect of the present invention, there is provided an electromagnetic vibrator, comprising: an electromagnetic assembly including a pair of electromagnets each having a core of E-configuration to define three parallel legs joined together at one side by a bridge, and further including a coil on the middle one of the three legs; the pair of electromagnets being secured together with the bridges facing outwardly and with the legs aligned with, but spaced from, each other; a plunger carrying magnetisable material disposed within the space between the legs of the electromagnets with the longitudinal axis of the plunger perpendicular to said parallel legs such that the plunger is movable along the longitudinal axis of the plunger upon the energization of the coils of the electromagnets; the coils of the electromagnets being energized by unidirectional current such that the middle leg of each electromagnet defines a first magnetic pole of one sense, which is the same in both electromagnets, and the other two legs define second and third magnetic poles of the opposite sense in the two electromagnets; and spring means including at least one spring yieldingly mounting the plunger to the electromagnets.
According to further features in the preferred embodiments of the invention described below, the plunger includes a non-magnetic stem carrying a ferromagnetic member acted upon by the first and second magnetic poles of each electromagnet, and a ferromagnetic member acted upon by the first and third magnetic poles of each electromagnet.
According to another aspect of the present invention, there is provided a pump having a reciprocatable pumping member, and an electromagnetic vibrator as described above for driving the reciprocatable pumping member. Because of the low transverse displacement of the plunger when using the electromagnetic vibrator of the present invention as will be described more particularly below, the pumping member may be either a piston or a diaphragm.
According to still a further aspect of the present invention, there is provided a leaf spring particularly useful for mounting one end of a plunger to an electromagnet assembly, the leaf spring including a center leg straddled on its opposite side by a pair of side legs all integrally joined together at their opposite ends by a crossbar; the center leg being formed with a hole for fixing thereto the respective end of the plunger, and each of the side legs being formed with a hole for fixing the leaf spring to the electromagnet assembly.
Further features and advantages of the invention will be apparent from the description below.
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Barish Benjamin J.
MNDE Technologies L.L.C.
Waks Joseph
LandOfFree
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