Wells – Brushing – scraping – cutting or punching-type cleaners – On tubing or casing
Patent
1984-11-06
1986-02-25
Leppink, James A.
Wells
Brushing, scraping, cutting or punching-type cleaners
On tubing or casing
285 32, 285117, 403359, E21B 3702
Patent
active
045722919
ABSTRACT:
A casing scraper for well casings in which the scraper blades are positively held on the scraper body. The blades are provided with retainer arms which engage a series of splines formed integrally with the scraper body, and slide up the splines to a cutting position. The blades are held in place by a retainer ring which has two sets of threads, with a gap in between the two sets. The lower set of threads normally engages annular threading on the scraper body to bear against the lower end of the blades and hold them in place. If the ring becomes partially unscrewed, the gap between the two sets of threading tends to resist further disengagement, and the ring remains sufficiently in place to prevent the blades from unloading. The orientation of the ring threading and of the annular threading is also reversed from the scraper's direction of rotation in normal use, so that under normal rotation the ring is urged to rotate more tightly against the blades, rather than to unscrew. The ring is further held against counter-rotation by a plurality of set screws which fasten into the scraper body.
REFERENCES:
patent: 2693239 (1954-11-01), Emanuel
patent: 2845129 (1958-07-01), Baker
patent: 3011556 (1961-12-01), Best
patent: 3031016 (1962-04-01), Conrad
patent: 3251418 (1966-05-01), Condra
patent: 3757859 (1973-09-01), Hammon
patent: 3827492 (1974-08-01), Hammon et al.
patent: 4189000 (1980-02-01), Best
patent: 4291764 (1981-09-01), Pampell
patent: 4479538 (1984-10-01), Coyle, Sr.
Dang Hoang C.
Leppink James A.
LandOfFree
Well casing scraper does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Well casing scraper, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Well casing scraper will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1008296