Conveyors: fluid current – Conduit
Reexamination Certificate
2001-07-16
2003-06-10
Dillon, Joseph A. (Department: 3651)
Conveyors: fluid current
Conduit
C138S156000
Reexamination Certificate
active
06575668
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device for transporting objects by means of airflow in a channel. The invention also relates to the use of the device.
2. Description of the Related Art
EP 0 216 203 B1 has disclosed a device for transporting objects by means of an airflow in a channel, in which the channel is formed by a cuboid body which has a substantially U-shaped recess extending over the length of the channel and covered by a plate.
The U-shape of the channel has the disadvantage that, in particular in the miniaturized dimension necessary for objects of less than 0.6 mm×0.6 mm, it cannot be produced with the necessary dimensional accuracy and smoothness of the surface. The consequence is that the objects are easily left behind in the channel.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a device for transporting objects by means of an airflow in a channel in which the channel, adapted in diameter to objects of small dimensions, especially to objects of dimensions less than 0.6 mm×0.6 mm, can be produced with a very high degree of dimensional accuracy and smoothness of the walls.
This object is achieved, according to the invention, by a device for transporting objects by airflow in a channel, including a first body having a convex surface formed of a section of a cylinder and having a planar section recessed from and intersecting the convex surface and parallel to the longitudinal axis of the cylinder, and a second body joined interlockingly with the first body and having a concave surface matching the shape of the convex surface, so that the recess forms the channel. Alternatively, the device may include a first body having a surface formed of a right prism with a base polygon having adjacent sides forming an angle &agr;<180° at an intersection of the adjacent sides, said first body having a recess along an edge of the prism at the intersection of the sides defining the angle &agr;, and a second body joined interlockingly with the first body and having a shape of a right prism with a base polygon having adjacent sides defining an angle &bgr;, such that &agr;+&bgr;=360°, so that the channel is formed with a uniform cross section defined by the adjacent sides of the second body and the recess extending along the edge of the first body.
REFERENCES:
patent: 2176439 (1939-10-01), Taylor et al.
patent: 3537485 (1970-11-01), March
patent: 3718371 (1973-02-01), Lasch
patent: 3873163 (1975-03-01), Gladish
patent: 5404914 (1995-04-01), Ziu
patent: 2241857 (1973-03-01), None
patent: 216 203 (1987-04-01), None
patent: 216 203 (1990-04-01), None
patent: 452 038 (1991-10-01), None
patent: 688 159 (1995-12-01), None
Dillon Joseph A.
Siemens Aktiengesellschaft
Staas & Halsey , LLP
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