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Expansible device
| Details |
Inventors: Sigmon, James W.;
Assignee:
Primary Examiner: Weakley; Harold W.
Assistant Examiner:
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher
An expansible device for exerting force which has a generally "S" shape cross-section, being formed by stepped diameter cylinder, and arrangements using such a device are disclosed. The device may exert sealing forces and be controlled by admission of fluid pressure which acts on a thin wall member so supported as to be subjected to compressive stress alone. |
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DETAILED DESCRIPTION OF INVENTION While the present invention will be described more fully hereinafter with reference to the accompanying drawings, it is to be understood at the outset of the detailed description of this invention that it is contemplated that various modifications of the invention as described may be made by persons skilled in the appropriate arts.
For that reason, the detailed description is to be read broadly, and not as limiting on the scope of this invention.
As briefly pointed out above, the device described here is intended to be used in many applications wherein it is desired to develop a linear motion over a selectively short distance while also developing a force which may be high but controllable from a fluid pressure source, to provide minimum return travel upon release of fluid pressure, to provide an annular opening coaxial with the device for the passage of fluids or mechanical elements such as rotating and/or reciprocating shafts, and to function reliably and maintain sealing integrity under extremes of environment and operating conditions not possible with typical piston-cylinder arrangements, bellows or diaphrams.
The device is of generally annular shape and has an "S" shaped or stepped cylindrical cross-section, with inner and outer cylinders and a radial portion generally straight and the junction between the inner cylinder and radial portion, and between the radial portion and outer cylinder, formed as radii as defined hereinafter.
There are at least two useful configurations in which the device is made.
One form (FIG.
1) involves a single member 20 as described above with the terminal ends of the inner and outer cylinders of the "S"welded to a fixed and non-yielding member 21 to form a pressure chamber 22 between the two, such that pressure applied within the chamber does not move the fixed member, but does produce motion of the "S" member.
The second configuration (FIG.
2) consists of two "S" shaped members 30a, 30b of the same radial portion and adjoining radii dimensions, but of differently elongated inner and outer cylinders of the "S" shape, fitted together and welded along the circumferences at each end so as to form a totally enclosed pressure chamber 32, one side of which is fitted with at least one connection 34 to introduce fluid pressure within the enclosure
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Metal Working 
