Telegraphy – Miscellaneous
Patent
1983-01-21
1985-10-01
McIntosh, John P.
Telegraphy
Miscellaneous
118 19, 118 20, A23G 326, B05L 500
Patent
active
045439060
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is concerned, generally, with a device for coating particles, particularly drugs in the form of particles, such as tablets and similar items. The device has a support, a drum resting in it, in such a way that it may rotate around a pivot or drum axis, said drum having a wall with an--at least, partially--perforated part, and with a gas transmission shoe that, in operation, is held by the support and lies against the aforementioned wall part, so as to make it possible for a gas to flow through it.
As to the concept of "drug particles", we want to state that, by it, solid pharmaceuticals (drugs) or pharmaceuticals that, at least, have a solid covering, i.e. so-called solid forms of administering medicines, such as tablets as well as pills and capsules, are to be understood.
2. Description of the Prior Art
From the U.S. Pat. No. 3,601,086, a device for the coating of tablets is known that comprises a support, a drum that may be rotated around a horizontal axis, and a driving mechanism for rotating the drum. The front side of the drum has been provided with a central opening.
On the opposite side, the drum is closed, connected with the driving mechanism by means of a flange-connected trunnion, and rests in the driving mechanism. The drum has a cylindrical perforated jacket part. In the support, within the region of the one lower quadrant of the drum, a suction shoe is held, in such a way that it may rotate, said suction shoe being capable of being pressed by a compressed-air cylinder by way of a lever system against the perforated jacket part of the drum. The suction shoe is connected with a suction fan, in such a way that, when the device is in operation, air can be sucked out of the interior of the drum through the perforated part of the jacket, the suction shoe, and the duct. The tablets to be coated are fed into the drum through the opening provided in it on the front side and will be removed again from the drum through that same opening after the coating has been applied.
In the devices developed in accordance with U.S. Pat. No. 3,601,086 and known in the market place, a casing enclosing the drum on all sides has been provided. The air is introduced into the casing on top and then sucked into the drum, while a large part of it flows through the perforation in the jacket of the drum. Further, the casing of the device known in the market place has been provided with a door in the region of the opening that is present on one opening in the drum on one of its front sides.
When the drum comes to a standstill, the tablets collect in its bottom part. Therefore, the drum must be raised for removing the tablets, in some way, up to the frontal opening of the drum. Thus, the removal of the tablets is made more difficult. It is also possible that the coatings applied to the tablets may be damaged when the tablets are lifted out of the drum.
The devices, and in particular also the drums, have to be cleaned from time to time,--at least, when the processed product is changed. For proper cleaning, the drums should be scrubbed with a brush, inside and outside. But, in the devices in accordance with the U.S. Pat. No. 3,601,086, the interior of the drum is accessible from one side only, which complicates the cleaning of the drum considerably. That is particularly true in the case of relatively large drums, the measurements of which, taken in the direction of the pivot, may amount to as much as approximately 5 m.
Moreover, the suction shoe can be moved only a relatively short distance away from the drum, which also hampers the cleaning of the outside of the drum and the suction shoe.
Another disadvantage of the devices in accordance with the U.S. Pat. No. 3,601,086 is to be found in the fact that the driving mechanism which is located by the side of the drum and is used to support the drum, also complicates the accessibility of the parts to be cleaned and, moreover, requires a relatively large amount of space, viz. according to the description in the patent
REFERENCES:
patent: 1122660 (1914-12-01), Sturjevant
patent: 2710574 (1955-06-01), Runion
patent: 2944512 (1960-07-01), Wilson, Jr.
patent: 3229609 (1966-01-01), Larson et al.
patent: 3357398 (1967-12-01), Gross
patent: 3573966 (1968-02-01), Hostetler
patent: 3601086 (1971-08-01), Hostetler
patent: 3696778 (1972-10-01), Moore
patent: 3834347 (1974-09-01), Motoyama et al.
patent: 3874092 (1975-04-01), Huttlin
patent: 3934545 (1976-01-01), Schady
patent: 3960196 (1976-06-01), Berner
patent: 3975995 (1976-08-01), Shuler
Glatt Werner
Grab Erwin
Glatt Maschinen - und Apparatebau AG
McIntosh John P.
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