Safety Cleaning Tool (Patent No: 456636)

Inventor: Hector, Morris

Location: Calgary

Comments: re-issue of Patent 403,892

Description: Morris Hector, Calgary, Alberta, Canada. Application April 2, 1946. Serial No. 539,986.
Notice: This is a re-issue of Patent No. 403,892 dated April 7, 1942.
6 Claims.

Claim.—1. A knife for cleaning deposits from oil-well tubing pipe, casing or formation comprising, a tubular housing having oppositely disposed openings therein, a floating piston in said housing adapted to be connected to a reciprocating well cable and having a longitudinally disposed slot, a pair of wings pivotally connected at the inner ends in said slot and having their outer end adapted to fulcrum on the lower edges of said openings, said openings being only large enough to receive the wings, and a spring in the housing sleeved on the upper end of the piston and adapted to normally hold said wings projected horizontally in scraping position through said openings, said spring being adapted to yield when the wings encounter an obstruction resistant enough to break the cable and permit the wings to rock downwardly below the horizontal and be withdrawn into the housing to released position to pass the obstruction.

2. A knife for cleaning deposits from oil well tubing, pipe, casing or formation comprising, a tubular housing having oppositely disposed openings therein, a floating piston in said housing adapted to be connected to a reciprocating well cable, a pair of wings pivotally connected at the inner ends to the piston and having their outer ends adapted to fulcrum on the lower edge of said openings, said openings being only large enough to receive the wings, a spring in the housing sleeved on the upper end of the piston and adapted to normally hold said wings projected horizontally in scraping position through said openings, the said spring being adapted to yield when the wings encounter an obstruction which might break the cable and permit the wings to rock downwardly below the horizontal and be moved into the housing to released position, a sleeve carried by the housing and loosely receiving the lower end of the piston, and a shoulder on the piston engageable with said sleeve to limit pivotal movement of the wings to prevent the wing- from too forcefully fulcruming on the edges of said openings.

3. A knife for cleaning deposits from oil well tubing, pipes, casing or formation comprising, a tubular housing, a floating piston in said housing having a longitudinally disposed slot and being adapted to be connected to a reciprocating well cable, a pair of wings having aligned hinge ears disposed in said slot, a pivot pin engaged through said piston and through said ears, there being a, lateral opening in said housing permitting insertion of the pin to assemble the wings with the piston, there being oppositely disposed fulcrum openings in the housing through which the wings project, said fulcrum openings being only large enough to receive the wings, said lateral opening being offset from the pin to prevent backing out of the pin when the wings are disposed in the fulcrum openings, and a spring in the housing sleeved on the upper end of the pi-ton and adapted to normally hold said wings projected horizontally in scraping position through said opening, the said spring being adapted to yield when the wings encounter an obstruction which might break the cable and permit the wings to rock downwardly below horizontal released position in the housing.

4. A knife for cleaning deposits from oil well tubing, pipes, casing or formation comprising, a tubular housing .having a laterally disposed opening therein, a floating piston in said housing. a wing pivotally connected to the piston and adapted to fulcrum on the lower edge of said opening, said opening being only large enough to receive the wing. and spring means in the housing engaging the piston and normally holding the wing in projected horizontal scraping position, said spring mean- being adapted to yield upon the wing encountering an obstruction such as must break the cable and permit the wing rocking downwardly below the horizontal to released position within the housing.