Lubrication – Lubricators – Force feed
Reexamination Certificate
1999-06-15
2001-05-15
Bonck, Rodney H. (Department: 3681)
Lubrication
Lubricators
Force feed
C239S338000
Reexamination Certificate
active
06230843
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a device to produce a fine oil mist, in particular for the lubrication of tools used when removing metal by machining, comprising a vapourising chamber into which oil and air under pressure enters through a supply line, a vapourising nozzle provided within the vapourising chamber at the end of the supply line and an outlet line for the transport of the aerosol produced in the chamber to a place of application.
The invention particularly concerns a device, with which an oil mist, having a smoke-like appearance, is produced, to provide minimum lubrication of the tools and work pieces during their machining. A preferred field of application relates to the supply of an internal minimum quantity of lubrication through the spindle of the machine of machine tools.
When such oil mist with the absolutely minimum oil concentration is applied, it is particularly important that the oil in the air is extremely, i.e. microscopically, distributed. Only in that case can it be reliably ensured that the oil mist is adequate for the lubrication of the work piece and of the tool yet does not precipitate therein a disadvantageous manner. Device for producing a fine oil mist are known, and can be mounted on an oil tank in such a manner that the vapourising chamber thereof is arranged above the oil tank, and separated therefrom by means of a metal separating sheet. On the underside of the oil tank, oil is fed by means of a piston pump which conveys oil and air through a coaxial double hose via the swirl chamber situated below the oil tank at a pressure of 0.6-1.0 MPa. The line ends in a vapourising nozzle having a diameter of approx. 1.8 mm in the interior of the swirl chamber. The oil, vapourised under influence of the highly compressed air, is supplied in the form of a mist to an outlet line opening into the swirl chamber and is conveyed through hoses and/or pipes to the place of application, in particular to the tool of a machine tool.
The separating metal sheet, provided between the oil tank and the swirl chamber, does not abut tightly against the wall of the system, so that oil drops or an oil film, which precipitate in the swirl chamber, can be collected in the oil tank situated below it for reuse.
A very fine oil mist can be produced with the known device by economically using oil, which is acceptable for numerous applications.
The present invention, however, attempts a further improvement in the production of oil mist in such a manner that an oil mist, containing extremely fine and homogeneously distributed oil particles, can be produced with even greater reliability and dependability.
SUMMARY OF THE INVENTION
This objective is achieved with an oil mist producing device in accordance with which features a vapourising chamber having a connection to a second chamber at a location which is distanced from the vapourising nozzle, and wherein the outlet line is introduced into the second chamber and extends almost along its entire length.
The basic principle of the invention is that the oil mist produced in the vapourising chamber is propelled through the second chamber, wherein there is the possibility that the small oil particles produced in the vapourising chamber are split further, i.e. they are reduced in their size and that undesirable large particles precipitate with greater reliability during the preparation of the oil mist.
To achieve this, the second chamber, provided downstream from the vapourising chamber, ensures that the oil mist does not enter directly into the outlet line but first passes through the second chamber. In this manner, only small oil particles, particularly those capable of floating, can enter into the outlet line, whereas heavier particles are collected in the second chamber or precipitate on its walls.
The device according to the invention can be constructed in a particularly compact manner, thus providing an added advantage. In particular, the device to produce the fine oil mist is not firmly connected physically to an oil tank and subject to its size, but is a separate unit which, in addition to the oil tank or oil supply container, comprises the pump necessary to produce the pressure as well as the associated hose and/or pipes as well as a housing for the apparatus.
REFERENCES:
patent: 1839193 (1932-01-01), Blanchard
patent: 1945464 (1934-01-01), Thomas
patent: 2245600 (1941-06-01), Medsker
patent: 2675214 (1954-04-01), Wendell
patent: 2718934 (1955-09-01), Norgren et al.
patent: 3243014 (1966-03-01), Bjorklund
patent: 4116387 (1978-09-01), Kremer et al.
Acculube Manufacturing GmbH
Bonck Rodney H.
Lowe Hauptman & Gilman & Berner LLP
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