Seal for a joint or juncture – Seal between relatively movable parts – Circumferential contact seal for other than piston
Reexamination Certificate
1998-06-16
2001-12-04
Sandy, Robert J. (Department: 3626)
Seal for a joint or juncture
Seal between relatively movable parts
Circumferential contact seal for other than piston
C277S519000
Reexamination Certificate
active
06325387
ABSTRACT:
This invention relates to a packing gland assembly mountable on a rotatable and/or an axially displaceable shaft, and more particularly to such an assembly which may be readily dismounted from a shaft for removing and replacing the packing rings thereof and/or cleaning the components thereof.
BACKGROUND OF THE INVENTION
Conventional packing gland assemblies mountable on rotatable and/or axially displaceable shafts of various devices such as horizontal batch mixers, motors, rotary valves, pumps and the like, generally consist of a housing member mountable on a shaft, having an opening for receiving the shaft therethrough, provided with an enlarged, annular section about the shaft when the housing is mounted on the shaft, a set of packing rings mountable on the shaft within the annular space of the housing member, a follower member mountable on the shaft and engaging the packing rings and means for pressing the packing rings against an annular wall of the housing member to expand the rings radially and thus form a seal between the shaft and the housing. Typically, such packing rings must be replaced and/or the assembly must be cleaned periodically which requires the dismounting of the assembly and the disassembly of the components thereof. Such disassembly of the components often is hampered by the fact that the packing rings become lodged within the housing and are difficult to remove. Various tools often are required to remove such lodged rings including various hooks, screws and other forms of extractors. It thus has been found to be desirable to provide a packing gland assembly which may be readily dismounted from a shaft and disassembled to replace the packing rings and/or clean the components thereof which does not require any special tools for extracting and removing the packing rings from such an assembly.
SUMMARY OF THE INVENTION
The present invention provides a novel packing gland assembly mountable on a rotatable and/or an axially displaceable shaft extending through an opening in a wall member of a device such as a horizontal batch mixer, motor, pump, rotary valve and the like, generally comprising a first housing member mountable on the shaft, having an opening therein for receiving the shaft therethrough, provided with an enlarged section defining an annular space about the shaft when the first housing member is mounted on the shaft with the shaft ending through opening therein, a second housing member mountable on the shaft, including a section receivable in the annular space provided by the first housing member, such section having an opening for receiving the shaft therethrough, provided with an enlarged section defining a second annular space about the shaft when the first and second housings are mounted on the shaft with the shaft extending through the openings thereof, such second housing member being divided into at least two components cooperable to encompass the shaft about the circumference thereof, at least one packing ring mountable on the shaft and receivable within the second mentioned annular space when the first and second housing members are mounted on the shaft with the shaft extending through the openings therein, a follower member mountable on the shaft, including a section received in the second mentioned annular space, in engagement with the packing rings when the first and second housing members, the packing rings and the follower member are mounted on the shaft with the shaft extending through the openings therein and means for pressing the follower member toward the fist housing member to compress the packing rings, causing the rings to expand radially and thus form a seal between the shaft and the assembly. With such an assembly, whenever it is desired to dismount and disassemble the assembly to replace the packing rings and/or clean the components thereof, all that needs to be done is simply to remove the pressing means, back off the follower member, back off the second housing member which will cause the packing rings to be removed from within the first housing member and then part the components of the second housing member to provide access to the exposed packing rings and thus facilitate their removal.
REFERENCES:
patent: 808082 (1905-12-01), Fuller
patent: 4289317 (1981-09-01), Kuc
patent: 4480842 (1984-11-01), Mahyera et al.
patent: 4623152 (1986-11-01), St. Jean
patent: 4878677 (1989-11-01), Larkins et al.
patent: 5476271 (1995-12-01), Hatting et al.
Lalos & Keegan
Sandy Robert J.
Schwing Karlena D.
The Young Industries, Inc.
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