US2221137A

US2221137A - Safety cleaning tool

Info

Publication number: US2221137A
Application number: US319360A
Authority: US
Inventors: Hector Morris
Original assignee: Individual
Current assignee: Individual
Priority date: 1940-02-16
Filing date: 1940-02-16
Publication date: 1940-11-12
Anticipated expiration: 1957-11-12

Description

Nov. 12,` 1940.

M. HECTOR SAFETY CLEANING Tool.

Filed Feb. 1e, 1940 174 l MPPZZS' 1760207;

EDH.. IW////f WITNESS Patented Nov. l2, 1940 SAFETY CLEANING TOOL Morris Hector, Royalties, Alberta, Canada anim Application February 16, 194i), Serial No. 319,360

Claims.

This invention relates to a safety cleaning tool or the type adapted to be used for cleaning deposits from oil well tubing, pipes, casing or formation.

In conventional devices of this character the scraping wings are not movable 'below the hori- Zontal scraping position and consequently stick where very long heavy deposits of paraffin or other substance are encountered and cause breaking of the cable and loss of the tool.

With this disadvantage in mind the present invention provides scraping wings which are adapted to be swung downwardly below the horizontal so as to be withdrawn into the tubular housing of the device and thus permit the device being safely moved past an obstruction which would ordinarily cause conventional wing-s to stick and cause breaking of the cable.

A further object of the invention is to provide a device of this character in which the screws which form the pivots of the scraping wings are prevented from backing out by the offset location of these screws relatively to the openings in the tubular housing of the device through which 25 the screws are inserted during assembly of the wings.

A further object of the invention is to provide a device of this character including a tubular housing and a floating piston therein having pivoted wings, there being a sleeve loosely receiving a reduced portion of the bottom of the piston and adapted to receive the impact of a shoulder on the lower end of the piston and prevent the tips of the wings from being drawn too far into the tubular housing and also to prevent the wings from too forcefully fulcrumming on the edges of the openings in the tubular housing through which the wings project during the scraping operation.

A further object is tofprovide a device of this character having upper and lower springs bearing against the piston and against respective adjustable nuts in the tubular housing and to serve as shock absorbers, the upper spring also tending to yieldably resist the weight of the tubular housing on the piston when the wings encounter an obstruction.

A further object is to provide a device of this character which will be formed of a few strong simple and durable parts, which will be inexpensive to manufacture, and which will not easily get out of order.

With the above and other o-bjects in view the invention consists of certain novel details o-f construction and combinations of parts herein- Tar orrorafter fully described and claimed, it being understood that Various modifications may be resorted to within the scope of the appended claims without departing from the spirit or sacrificing any of the advantages of the invention. 5

In the accompanying drawing forming a part of this specification:

Figure 1 is a longitudinal sectional view of a safety cleaning tool constructed in accordance with the invention, with parts in elevation.

Figure 2 is a cross sectional view taken on the line 2-2 of Figure 1.

yFigure 3 is a fragmentary side elevation showing an opening in the tubular casing in which a respective wing is fulcrumed.

Figure 4 is a detail longitudinal sectional View of the device showing the wings in full lines withdrawn into the tubular housing as the device is lowered into the well tubing and showing the wings in dotted lines swung below the horizontal f to be withdrawn into the tubular housing when an unusually heavy sticky deposit is encountered.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, Ill designates a tubular housing. A tubular plug Il is threaded into the upper end of the housing and a tubular plug I2 is threaded into the lower end of the housing, the plug I2 having a pointed lower end I3.

A iloating piston I4 is slidably mounted in the c housing and is provided at intervals with longitudinal slots l5 which open through diametrically opposite points of the piston and which also are staggered relatively to each other, as best` shown in Figure 1.

A pair orA scraping wings I6 are pivotally mounted in each slot, the inner ends of the wings being provided with hinge ears I'I, as best shown in Figure 2, through which a pivot pin I8 is passed to pivotally secure the wings to the piston. The piston is provided with a transverse opening I9 to receive the pin, one end of the opening being smooth and the opposite end of the opening being threaded to receive screw threads 20 formed on the respective end of the pin. lA kerf 2i is formed in the head of the pin to receive a screw ydriver for screwing the pin into the piston to For permitting insertion of the screw a respective opening 22 is formed in the In scraping position of the wings, that is, when-the wings are extended horizontally from the piston, the screw pin I8 is offset from the opening 22, as best shown in Figure mount the wings.

tubular housing.

of the piston.

rn backing out The piston is provided at the upper end with a reduced stem 23 which projects through the tubular plug Il and which may be connected to an operating cable, or the like, for reciprocating the device in oil well tubing pipe, casing, or formation. An upper strong helical spring 24 is sleeved on the stem and bears at the lower end against a shoulder 25 and at the upper end bears against a nut 25 threaded exteriorly to engage similar screw threads on the inner wall of the tubular housing as shown at 2l. The nut is provided with openings 28 to receive a spanner wrench when the plug Il is removed for adjusting the nut to regulate the tension of the spring 211.

A lower helical spring Z9 which is weaker than the upper spring is sleeved upon a stem 3i) which extends from the lower end of the piston and projects into the tubular plug I2. The spring bears at its upper end against a shoulder 3| formed on the lower end of the piston and at its lower end bears against a nut 32 which is provided eXteriorly with screw threads to engage similar screw threads on the inner wall of the tubular housing as shown at 33. The nut is provided with recesses 3ft to receive a Spanner wrench when the lower tubular piug I2 is removed for adjusting the nut to regulate the tension of the spring 29.

As best shown in Figure 3, the wings I6 project through respective oppositely disposed openings 35 in the housing having upper and lower beveled edges 3B and 3l. The wings fulcrmn on these beveled edges when being withdrawn into or projected outwardly from the tubular housing I0. The openings 35 need be only large enough to receive the wings. The wings have arcuate movement inside the housing iii. Thus the possibility of wax getting into the housing and clogging the working parts is eliminated.

The upper and

lower springs

24 and 29 are adjusted by the

nuts

25 and 32 to so dispose the piston in the tubular housing so the wings i6 normally project horizontally from the housing in scraping position. When the device is lowered into the well tubing the friction of the wings i6 against the tubing will initially start the withdrawing movement of the wings into the tubular housing so that the wings assume the position shown in full lines in Figure 1i. As soon as the cable is pulled upwardly the piston 23 will be pulled upwardly and the

springs

24 and 29 dispose the wings in the horizontal scraping position shown in Figure 1. Should an unusually sticky deposit of paraiiin, or other substance, be encountered so as to tend to break the cable, friction of the wings against such deposit co-acting with the upward movement of the oating piston will cause the wings to be swung below the horizontal to the dotted line position shown in Figure 4;, in which position of the wings the device may be safely moved past the obstruction without damage. After the obstruction is passed, the wings return to normal position.

The tip ends of the wings fulcrum on the beveled edges of the openings 35 in the tubular housing during pivotal movement of the wings and it will be pointed out that before the extreme tip ends of the wings move sufficiently to be withdrawn entirely within the tubular housing the lower shoulder 3i of the piston will contact with the top of a sleeve 38 which is disposed on top of the lower nut 32 and loosely receives the lower stem 3i] of the piston. This sleeve not only acts as a stop, but also prevents too forceful fulcruming of the tip ends of the wings on the

beveled edges

36 and 31 of the openings 35 in the tubular housing so that wear on the parts is greatly reduced.

Since the operation of the device has been described as a description of the parts progressed, it is thought that the invention will be fully understood without further explanation.

What is claimed is:

1. 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 and having a longitudinally disposed s lot, 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 only 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 oppcsitely disposed openings 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 adjustabiy 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 movementl of the Wings to prevent the wings 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 inserton 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 pivotallyI 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.

MORRIS HECTOR.