Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Fluid pressure responsive
Reexamination Certificate
1999-12-22
2001-10-09
Savage, Matthew O. (Department: 1723)
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Fluid pressure responsive
C210S172300, C210S238000, C210S450000, C210S452000, C210S470000
Reexamination Certificate
active
06299762
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an oil-filter assembly. More particularly this invention concerns such a device used to purify the oil circulated through a tap selector.
BACKGROUND OF THE INVENTION
A standard Type 51 oil-filter assembly sold by Maschinenfabrik Reinhausen as BA 18/03de-1196/1000 has a normally stationary base unit formed as an upwardly open cylindrical can on which or in which is mounted a pump-motor unit. A cover closes the top of the can and normally has a fitting connected via a flexible oil line to the piece of equipment whose oil is being filtered. The oil is filtered by being passed through a sleeve-like filter insert held in the can. A simple paper filter is used to eliminate particles from the oil and composite filters are used in high-humidity environments to also strip out any water droplets.
The cover for the assembly has a rod that projects axially through the filter insert which is secured to it by a nut and washer. As a result changing the filter insert is a very messy job. The cover and attached insert must normally be completely disconnected so that a tool can be applied to the nut to loosen it and allow the old insert to be removed. Since the filter insert itself is soaked in oil, such a job is sure to spread oil around the work space. In addition the mass of the cover and filled insert are considerable so that it is not easily lifted out of the base unit. At the very least the area around the filter assembly can be counted on to be well sprinkled with dirty oil during such a filter change.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved oil-filter assembly.
Another object is the provision of such an improved oil-filter assembly which overcomes the above-given disadvantages, that is which is easy to service, in particular whose insert can easily be removed and replaced with minimal difficulty or mess.
A further object is to provide an improved filter insert.
SUMMARY OF THE INVENTION
An oil-filter assembly has according to the invention an upwardly open can generally centered on an upright axis and having at an upper rim a mounting ring having in turn an axially upwardly directed annular seal surface and, offset axially downward therefrom, an annular upwardly directed annular shoulder surface. A filter insert of filter material in the can has an annular outwardly directed flange sitting on the shoulder surface and an upper end wall. A cover fittable over the ring has a lower surface engageable with the seal surface of the ring and with the end wall of the filter insert. Fasteners press the cover down on the ring and filter insert and retaining the cover in place on the ring.
Thus with this system the filter insert is not fixed to the cover. The cover can be unfastened, typically by undoing a few peripheral bolts, and set aside, then the filter insert lifted out of the can separately. The procedure can be done quite neatly and, since the two parts are separate, neither is so unwieldy to make handling a problem.
The seal surface of the mounting ring lies radially outside the shoulder surface. In addition the lower surface of the cover is stepped and has an outer portion engaging the seal surface and an inner portion offset axially downward from the outer portion and engaging the filter-insert end wall.
The mounting ring in accordance with the invention is formed with a throughgoing passage. The assembly further has a pressure gauge mounted on the ring and connected to the passage, and a pressure switch mounted on the ring and connected to the passage. The cover is provided with a central port and the insert is annular and sleeve-shaped. The port opening into the insert.
An oil-filter insert has according to the invention a cylindrical and metallic outer wall centered on an axis, a substantially closed bottom end wall downwardly closing the outer side wall, an annular top wall projecting radially inward from the side wall, a filling of filter material carried on the side wall between the top and bottom walls, and a radially outwardly flange projecting radially from the side wall axially spaced from the top end wall.
The flange projects perpendicularly from the side wall and is elastically deformable.
The oil-filter insert according to the invention further has at least one bale wire secured to insert adjacent the end wall and movable elastically between a compressed position lying wholly below the end wall and an uncompressed position projecting upward past the end wall. The top end wall can be formed with an annular groove in which the bale wire is mounted.
REFERENCES:
patent: 3368679 (1968-02-01), Bozek
patent: 3853763 (1974-12-01), Hall
patent: 5417855 (1995-05-01), Gershenson
patent: 1907085 (1964-12-01), None
Szabo Arpad
Wittenzellner Georg
Dubno Hebert
Maschinenfabrik Reinhausen GmbH
Savage Matthew O.
Wilford Andrew
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