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
Ryznic, John E. (Department: 3746)
Expansible chamber devices
With guide or seal on cylinder end portion for piston or...
Non-metallic seal means between piston or member and end...
C277S511000, C417S554000
Reexamination Certificate
active
06212999
ABSTRACT:
BACKGROUND OF THE INVENTION
Reciprocating piston pumps for use in pumping paints and other viscous materials have been well known. Some of these pumps, are non-adjustable and thus when they start to leak must be repacked. Current adjustable designs are also susceptible to mis-assembly in variations in torque which lead to substantial variations in packing life.
SUMMARY OF THE INVENTION
It is therefore an object of this invention to provide a pump which is easily manufactured and further which may be consistently manufactured thereby leading to increased packing life.
In the instant invention, the torque clip is made from precision music wire which gives the design a tight wire diameter tolerance to be re-used indefinitely without requiring cylinder assembly externally which makes it easily accessible for removal once the pump begins leaking in the throat area.
With this design, the manufacturing consistency is improved greatly by taking the possibility of over-torqueing out of the equation. With the instant design, the operator installs the clip on the throat nut and then screws the throat nut into the cylinder housing until it sets on to the clip thereby resulting in no variance in packing squeeze which was formally induced by the throat nut. Testing has shown that packing squeeze can decrease the pump life by up to one half of its normal life if it is done improperly.
The same reasons that provide consistency in original manufacture also provided to the end user when the pump is repacked.
These and other objects and advantages of the invention will appear more fully from the following description made in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views.
REFERENCES:
patent: 2231680 (1941-02-01), Pfauser
patent: 3143933 (1964-08-01), Norton
patent: 4082105 (1978-04-01), Allen
patent: 4093240 (1978-06-01), Masuda et al.
patent: 4135546 (1979-01-01), Morrison
patent: 4169605 (1979-10-01), Nishimoto et al.
patent: 4291768 (1981-09-01), Diehl
patent: 4328973 (1982-05-01), Delbridge
patent: 4576385 (1986-03-01), Ungchusri et al.
patent: 4659064 (1987-04-01), Scobie et al.
patent: 4809993 (1989-03-01), Henshaw
patent: 4936197 (1990-06-01), Brent
patent: 4989882 (1991-02-01), Warner et al.
patent: 4997191 (1991-03-01), Warner
patent: 5044606 (1991-09-01), Wordin
patent: 5267533 (1993-12-01), Smith
patent: 5346037 (1994-09-01), Flaig et al.
patent: 5671656 (1997-09-01), Cyphers et al.
patent: 5740718 (1998-04-01), Rathweg
Farrow Douglas B.
Graco Minnesota Inc.
Ryznic John E.
LandOfFree
Automatic throat packing torque clip does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Automatic throat packing torque clip, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic throat packing torque clip will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2519952