Agitating – Stirrer within stationary mixing chamber – Rectilinearly reciprocable stirrer
Patent
1989-01-18
1990-10-30
Jenkins, Robert W.
Agitating
Stirrer within stationary mixing chamber
Rectilinearly reciprocable stirrer
222190, 222386, 366256, 366340, B01F 512
Patent
active
049664689
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a mixing device for mixing and homogenizing pasty or flowable compositions.
Prior to being processed, pasty or flowable compositions often require a mixing or homogenizing operation. This is particularly necessary if they consist of more than one component such as synthetic resin and hardener which are combined directly prior to the processing. Such masses are used for inst. as sealing agents or adhesives or as plastic impressive material.
There have been known mixing devices containing a number of components separately accommodated in various compartments. Prior to the blending operation, the compartments are interconnected or a partition wall between the compartments is destroyed or removed thus enabling the components to come into contact. Thereafter, the masses present in a cartridge are treated with a mixing member comprising a rod extending out of the cartridge and adapted to be manually moved axially and to be rotated. Subsequently, the mass contained in the cartridge may be squeezed out by moving out thereof a piston.
The production of the known mixing means is involved and expensive and the mixing effect is mostly unsatisfactory. If several components are contained in one common cartridge, it is always suited for a specific quantitative ratio of the two components only. In other words, such cartridges are useful, but simply for a definite material which requires a specific mixing ratio. Added thereto, the component available in a low amount, is often inflammable. In such a case, the total cartridge must be stored according to fire-protection rules by observing certain safety regulations although only a relatively low percentage of the cartridge content is inflammable.
According to the instant invention, the mixing member is connected through the piston to the rod required for its operation. For the mixing operation, the mixing member is reciprocated in axial direction of the cartridge, and it may be rotated simultaneously about its longitudinal axis. Upon termination of the mixing operation, the mixing member is placed against the piston end wall, and the rod is removed from the mixing member which is retained by the piston. Upon the separation, the mixing member together with the piston forms one sole unit which may be used for squeezing the mixture out of the cartridge. To this effect, use may be made of customary squeezers which normally serve for squeezing sealing substances out of cartridges.
It is a particular advantage that the usual tubular catridges may be used without any modification. The mixing member which, during the mixing operation, is movable separately from the piston, is connected to the latter upon termination of the mixing phase, whereby the mixing member closes the passage opening of the piston thus obtaining a tight end wall of said piston. Upon separation of the rod from the mixing member, the latter forms, so to speak, part of the piston, and, during the following squeezing operation, it is not moved independently. In a way, the piston is completed by the mixing member fixed thereto. During mixing, the piston serves as an element for closing the cartridge and for guiding and sealing the rod. In the delivery state, the mixing member may be also joined to the piston, unless the rod is connected to the mixing member. For the mixing operation, the rod is connected to the mixing member which is retained by the piston. By an axial advance of the rod, the connection between the mixing member and the piston is cleared thus enabling the mixing member to freely operate, while the passage opening of the piston is sealed against the rod thus preventing the mass from escaping from the cartridge along the rod.
It is preferable to provide the mixing member with a hollow shaft which is sealingly received by a sleeve projecting rearwardly from the front piston surface. The outer diameter of the shaft is equal to that of the rod connectable therewith. The connection between rod and hollow shaft is preferably realised by threads, in particular by a multiple thread.
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REFERENCES:
patent: 3828980 (1974-08-01), Creighton
patent: 3858853 (1975-01-01), Rausch
patent: 4197967 (1980-04-01), Baur
patent: 4208133 (1980-06-01), Korte-Jungermann
Alfred Fischbach KG
Jenkins Robert W.
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