Agitating – Having specified feed means – Predetermined mixing ratio
Utility Patent
1999-02-15
2001-01-02
Soohoo, Tony G. (Department: 1723)
Agitating
Having specified feed means
Predetermined mixing ratio
C366S177100, C366S182200, C222S137000
Utility Patent
active
06168308
ABSTRACT:
BACKGROUND OF THE INVENTION
Mechanical proportioners for mixing plural component materials are of course in general well known and have been used successfully for a number of years. One problem that has become apparent however is that materials in recent years have become more and more viscous and are requiring higher and higher pressures for mixing and application. Because of these higher pressures required, much higher forces are required and this has presented a number of mechanical problems which require solution.
Such proportioners can also be prone at times to mixed materials setting up within the mix manifold therefore requiring tedious disassembly and cleaning or sometimes in fact even replacement of parts because of the setup mixed materials therein. Also due to the substantial cost of these materials, it is important that the operator be assured that the machine is operating properly in the proper configuration when desired.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a mechanical proportioner which is capable of mixing materials at high pressures utilizing the elevated forces required to do so and which is mechanically sound and reasonably easily disassembled for servicing and the like.
It is yet a further object of this invention to provide a mix manifold which minimizes exposure of the manifold surfaces to mixed material.
It is yet a further object of this invention to provide an interlock scheme for the valves and mix manifold so as to ensure that all valves are properly positioned for operation or purging.
Two pump lowers are connected together by a yolk underneath an air-operated reciprocating piston pump (other types of reciprocating pumps may of course be utilized) such as Graco's Premier pump. The air motor shaft enters the yolk in the center and the two pump lower shafts are located equidistant from the center of either side thereof. It is important to be able to minimize the distance between the two pump rods and toward that end, the pumps are staggered axially so as to enable overlapping of certain portions thereof thereby enabling the center-to-center distance to be minimized.
A small interference fit of the pump shafts and the yolk at the bottom end thereof in conjunction with substantial torque ensures that the center distance is absolutely balanced on either side of the air motor shaft.
The mix manifold is constructed in a concentric fashion such that mixed material does not come into contact with the mix manifold until it enters the static mixer at the exit of the manifold which is an easily disposable and replaceable part. While the two components may be in contact with one another, that point of contact is isolated from the interior surface of the mix manifold.
The purge solvent valves on the mix manifold are each provided with an extension of their respective handles. If either purge valve is in its open position, a separate interlock handle operating the A and B side valves at the manifold inlet is prevented from opening. Similarly, if the interlock handle operating the A and B side valves is open, the purge valves cannot be opened.
REFERENCES:
patent: 3814289 (1974-06-01), Robbins
patent: 3981487 (1976-09-01), Papoff et al.
patent: 4538920 (1985-09-01), Drake
patent: 5114241 (1992-05-01), Morrison
patent: 5234268 (1993-08-01), Homan
patent: 5524983 (1996-06-01), Dittgen et al.
patent: 5540498 (1996-07-01), Chu
Friedrich Adam R.
Isais John F.
Lehrke Kenneth E.
Peterson Vicky J.
Pittman David M.
Farrow Douglas B.
Graco Minnesota Inc.
Soohoo Tony G.
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