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Permeater Coreholder (Patent No: 504119)

Inventor: Crawford, James G. (assignor)

Location: Casper, WY

Comments: N/A

Description: James G. Crawford, Casper, Wyoming, U.S.A., and Charles A. Petrie and Alexander Marshall, Edmonton, Alberta, Canada, assignors to Chemical and Geological Laboratories, Ltd., Edmonton, Alberta, Canada. Application December 6, 1949, Serial No. 595,057.
4 Claims.

1. A device for facilitating the testing of the permeability of a hollow cylindrical sample comprising a metal cylinder with a removable lid, a double piston riding in said cylinder, the double piston being adapted to move upwards on the activation of fluid pressure below the double piston and adapted to move downwards on the activation of fluid pressure between the pistons of said double piston, a sphere mounted in a cavity on the upper piston of said double piston, said cavity being correspondingly in the shape of part of a sphere, a disc with a cavity correspondingly in the shape of part of a sphere seated on said sphere, said disc being spaced from the upper piston, whereby said disc moves up and down with said double piston but has limited universal movement therewith, compression springs between the disc and the upper piston to maintain disc and piston in normally parallel relationship, means providing inlet ports near the periphery of said lid of said cylinder and means providing an inlet port near the center of said lid.

2. An apparatus for use in measuring the radial permeability of porous substances comprising a fluid tight housing, said housing having an upper portion with parallel side walls and a removable top closure at right-angles to said side walls and having a lower portion with parallel side walls spaced at a greater distance than the side walls of the upper portion and a fluid tight bottom closure, a double piston within the housing having an upper piston slidably engaging the side walls of the upper portion, a lower piston slidably engaging the side walls of the lower portion, a stem connecting said pistons in constantly spaced relationship and means for preventing the passage of fluid between each of said pistons and the side walls engaged by such piston, means providing ports adjacent to the top and bottom of the lower portion for the passage of hydraulic fluid and means connected with said ports to supply hydraulic fluid to the space between said pistons while removing it from the space beneath the lower piston to lower the pistons and to supply hydraulic fluid to the space beneath the lower piston while removing it from the space between the pistons to raise the pistons, a platform with limited universal movement disposed on and normally parallel to the upper surface of the upper piston, gaskets on said platform and attached to the lower surface of said lid to receive a sample, means providing a port passing through the lid and the .gasket attached thereto communicating with the hollow interior of said sample and means providing at least one exteriorly communicating port outside the last mentioned gasket communicating with the space between the exterior of the sample and the side walls of the upper portion of the housing.

3. An apparatus as in Claim 2 in which limited universal movement for said platform is provided by a spherical ball centrally disposed with respect to the platform and the upper surface of the upper piston, opposed cavities in the lower surface of the platform and the upper surface of the cylinder having the same curvature as said ball cooperating with said ball, the platform and the upper piston being maintained by yieldable means in spaced normally parallel relationship.

4. An apparatus as in Claim 3 in which the platform and the upper piston are maintained in normally parallel relationship by at least three compression springs spaced adjacent to the periphery of the platform and being retained in opposing recesses in the lower surface of the platform and the upper surface of the upper piston.

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