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Safety Cleaning Tool (Patent No: 403892)

Inventor: Hector, Morris

Location: Royalties

Comments: N/A

Description: Having regard to the foregoing disclosure, the Patent of which this specification forms part confers, subject to the conditions prescribed in the Patent Act, 1935, the exclusive right, privilege and liberty of making, constructing, using and vending to others to be used, the invention as defined in claims submitted by the patentee as follows:-

1. A knife for cleaning deposits from oil well tubing, pipes, casing or formation comprising, a tubular housing having opposite 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 ends adapted to fulcrum on the edges of said openings, said openings being on large enough to receive the wings while the wings have arcuate movement inside the housing, and a pair of springs in the housing sleeved on the upper and lower ends of the piston and adapted to normally hold said wings projected horizontally in scraping position through said openings, the upper spring being of greater strength than the lower spring and 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an obstruction resistant enough to break the cable and permit the wings to rock downwardly below the horizontal and be withdrawn into the housing to released position to pass the obstruction.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, pipes, casing or formation comprising, a tubular housing having oppositely disposed opening therein, a floating piston in the housing adapted to be connected to a reciprocating well cable, wings pivotally connected to the piston and projecting through said openings, said openings having upper and lower beveled edges forming fulcrums for the wings, said openings being only large enough to receive the wings while the wings have arcuate movement inside the housing, springs on the upper and lower ends of the piston, nuts adjustably mounted in the housing engaging the springs for regulating the pressure of the springs on the piston, said springs normally holding the wings projected horizontally in scraping position through said openings, the upper spring being of greater strength than the lower spring and yielding to permit the wings to rock downwardly below the horizontal and be withdrawn to released position in the housing when the wings encounter an obstruction which might break the cable.

3. A knife for cleaning deposits from oil well tubing, pipes, 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 edges of said openings, said openings being only large enough to receive the wings while the wings have arcuate movement inside the housing, a pair of springs in the housing sleeved on the upper and lower ends of the piston and adapted to normally hold said wings projected horizontally in scraping position through said openings, .the upper 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 s from too forcefully fulcruming on: the edges of said openings.

4. 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 while the wings have arcuate movement inside the housing, 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 pair of springs in the housing sleeved on the upper and lower ends
of the piston and adapted to normally hold said spring projected horizontally in scraping position through said opening, the upper 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.

5. 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 edges of said opening, said opening being only large enough to receive the wing while the wing has arcuate movement within the housing, and spring means in the housing engaging the piston and normally holding the wing in projected horizontal scraping position, said spring means being adapted to yield upon the wing encountering an obstruction such as might break the cable and permit the wing rocking downwardly below the horizontal to released position within the housing.

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