Conveyors: fluid current – Load flow diverter – divider – or combiner – Movable conduit section
Patent
1980-07-02
1982-10-26
Nase, Jeffrey V.
Conveyors: fluid current
Load flow diverter, divider, or combiner
Movable conduit section
B65G 5124
Patent
active
043559301
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a system for control and locking of the pivoting switch of a pneumatic tube conveyor unit.
In a pneumatic tube conveyor, it is known that there exist a certain number of sending-receiving stations served by one or more lines, often connected to an automatic control center. In order to limit the cost of these installations, it is more and more common to use, to the extent possible, a single conveyor line to which are here and there connected shunt lines leading to a station. At the connection point, it is therefore necessary to have a switching mechanism which is in continuous sealed connection with the line sections it joins.
A sealed housing surrounds the tube inlets, inside of which are located the switching mechanisms themselves. However, there must also be a seal at least between the pivoting end of the switch and one of the lines.
Various mechanisms exist for carrying out the pivoting of the switch and its sealed locking against the end of a line, consisting of giving said switch, in addition to its lateral pivoting movement, an axial displacement permitting it to compress, at the end of its travel, an annular gasket mounted on the line so as to complete the seal, said axial displacement being made possible by a flexible coupling playing the role of pivot axis.
Compression of this gasket by the pivoting tube requires application onto the switch of a certain axial force and, consequently, a sturdy mechanism having a relatively high-powered control unit. Furthermore, in known systems, the system cannot be operated in all positions, due to the variable force of gravity on the movable switch according to the orientation of the switch assembly.
In order to improve the systems for controlling and locking pivoting switches, while at the same time eliminating the difficulties inherent in known constructions, the applicant has developed a new control and locking system which has the following advantages. First, the control mechanism requires only a low power motor, since the angle of pivot at the fulcrum of the control arm is small. Next, the system is able to operate in any position, whether the switch is horizontal, vertical, directed upward, downward, etc., and for any direction of travel of the cartridge. In addition, construction is simple, inexpensive, and reduced in size, thus enabling easy incorporation into the switch housing. Finally, by virtue of its disposition inside a sealed housing, the new system of the invention operates without any need to seal the shunt line.
According to an essential characteristic of the invention, transmission of the pivoting movement of the control arm, at its fulcrum on the movable switch, is effected by means of a return arm articulated both on the control arm and on a switch drive stop which plays the role of fulcrum, said return arm further having a guide wheel intended to track the two inclined sides of a single cam mounted stationary onto the frame.
According to one particular characteristic of the invention, there is provided a pivoting paddle turning about the control axis and projecting up to the switch drive stop, intended to compensate for the weight of the mechanisms and the switch under certain conditions of use.
Other particular characteristics and advantages of the invention will emerge from the following description of one embodiment, with reference to the attached drawings, which represent:
FIG. 1: a partial vertical cross-section of the pivoting switch and its control mechanism;
FIG. 2: a cross-sectional view along line AA' of FIG. 1;
FIG. 3: a partial cross-sectional view along B of FIG. 1;
FIGS. 4 and 5: cross-sectional views analogous to FIG. 2, showing the pivoting switch in intermediate position and pivoted position;
FIG. 6: a partial vertical cross-section of the switch, according to one variant.
The switch represented, particularly in FIGS. 1 and 2, is contained within a sealed housing 1 which, on one side, receives a connection ferrule 2 on the main line and, on the other, a connection ferrule 3 on the opposite section of
REFERENCES:
patent: 3367603 (1968-02-01), Feyerherd
patent: 3762664 (1973-10-01), Loveless
patent: 3868071 (1975-02-01), Weaver
patent: 3961643 (1976-06-01), Lynch
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