Expansible chamber devices – With guide or seal on cylinder end portion for piston or... – Non-metallic seal means between piston or member and end...
Reexamination Certificate
1998-12-21
2001-04-10
Look, Edward K. (Department: 3745)
Expansible chamber devices
With guide or seal on cylinder end portion for piston or...
Non-metallic seal means between piston or member and end...
C092S251000, C092S257000
Reexamination Certificate
active
06212998
ABSTRACT:
BACKGROUND OF THE INVENTION
Reciprocating piston pumps have been well known for many years for paint and other viscous materials. While current designs are generally satisfactory for their intended use, users are always desirous of increased packing life so as to prevent interruption of jobs and productivity.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a pump which is easily and inexpensively manufactured.
This invention serves to eliminate parts and assembly time, provide a nonadjustable packing cluster and with an increased stack height which provides more load carrying capabilities and running true to the cylinder which will result in an increase of as much as 50% over standard packing life and eliminate torque sensitive packing adjustments.
The pump rod is machined to allow relief with a shoulder that provides an area where the packings and glands slide on to the rod. This provides exact alignment and runout to the upper portion of the rod and to which throat packings and glands align as well. This allows for minimal side loading or twisting between the two sets of packings and glands. It also provides a one piece piston that can be screwed into the end of the rod to compress the packing cluster to a predetermined compression tolerance and eliminates multiple assembly pieces and torque settings for the packings.
An additional leather and UHMWPE packing are added to the piston to eliminate any rocking of the piston which causes gland wear against the cylinder which may lead to reduced life. Using the various features of the instant invention, a packing life increase of greater than 50% has been observed compared to current designs.
Piston life is increased by over 50% to the precise alignment of the rod and upper throat packings and glands and precise tolerancing. The packings are preloaded to a predetermined compression tolerance for ease of installation and maintenance. Current assemblies include a piston with a torque nut to assemble the head of the piston and a rod. This leaves the runout tolerances to be determined by threads on the piston and piston head along with torque nuts and LOCTITE®. Such designs can result in premature piston failure.
REFERENCES:
patent: 2726908 (1955-12-01), Nied
patent: 3046621 (1962-07-01), Morton
patent: 4345766 (1982-08-01), Turanyi
patent: 4440404 (1984-04-01), Halliburton
patent: 4572519 (1986-02-01), Schlumberger
patent: 4875690 (1989-10-01), Maruyama
patent: 4878815 (1989-11-01), Stachowiak
patent: 4991495 (1991-02-01), Loegel et al.
patent: 5228842 (1993-07-01), Wagner
patent: 5740718 (1998-04-01), Rathweg
Lindblom Thomas D.
Thompson David J.
Farrow Douglas B.
Graco Minnesota Inc.
Lazo Thomas E.
Look Edward K.
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