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Патент USA US3070178

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Dec. 25, 1962
J. R. soLUM ETAL
3,070,168
WELL scRATcHER
Filed April 2l, 1960
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JNVENTORS
BY
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DeC- 25, 1962
J. R. soLUM ETAL
3,070,168
WELL SCRATCHER
Filed April 21, 1960
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United States Patent Office
3,670,163
.lames R. Salam, Los Angeles, and William C. Hempel,
Manhattan Beach, Calif., assignors, by mesne assign
ments, to B à W incorporated, Torrance, äïalif., a cor
’ poration of California
Filed Apr. 2l, Hdd, Ser. No. 23,6%
10 ßClaims. (fil. 166-173)
Fatented Der:e 25, 1962
2
il
WELL SCRATEHER
Eßîiddbd
opposite lead. The supporting legs 25, 26 extend from
one end of each coil respectively. These supporting legs
are symmetrically positioned with respect to the scratchcr
lingers 22 and are axially aligned.
A foot piece generally designated 27 joins the support
legs and rests on the outer surface of the carrier.
The
foot piece includes spaced parallel parts 28 joined by a
curved connector 29.
A series of retainers 3f) are provided on the collar
This invention relates to well scratchers of the general 10 1l, one for each scratcher finger assembly respectively.
type shown in the Wright Patent 2,506,405.
Each of these retainers comprises a strip of metal slieared
The principal object of this invention is to provide
on parallel edges from the collar il and deformed ont
a new and improved mounting for scratcher finger assem
blies on the outer surface of the carrier. The carrier
may comprise a cylindrical collar adapted to encircle
the well pipe or may comprise an axially extending mem
ber adapted to be fixed on the outer surface of the well
ward therefrom to form two loops 3l.
The ends of each
retainer strip remain integrally joined to the collar 1f
and the central portion 32 thereof is clamped between
the edges of the opening 33. This opening 33 is pro
duced in the collar “il by formation of the .retainer strip
pipe. The collar type may be of solid cylindrical form
30. Each of the loops 3l encompasses one of the spaced
or may be hinged if desired for lateral application to
parts 23 of the foot piece 27 and thereby serve to clamp
the well pipe.
20 the foot piece ñrmly to the outer Surface of the collar il.
A more particular object of this invention is to provide
The retainer strip is first blanlzed from the collar 11
a well scratcher device having a plurality of retainers
and assumes the single arch shape shown at 35 in FIG
for clamping a foot piece of each scratcher finger assem
URE 8. The foot piece Z7 of a scratcher finger assembly
bly to the outer surface ot' the carrier, each retainer
is then inserted under this arched strip on the outer
comprising a strip of metal sheared on parallel edges 25 surface of the collar lll.. The single arch 35 is then
from the carrier and deformed outward therefrom to
form two loops at spaced locations. The ends of each
deformed to cause the central portion thereof to reenter
the opening 33 defined by the parallel edges and the re
such strip remain integrally joined to the carrier and the
verse curve 32- of the central portion is wedged tightly
central portion thereof is clamped between the edges
between the parallel Walls which define the opening 33.
30
of the opening of the carrier resulting from formation
Considerable force is required to reinsert the central
of the strip, each of the loops encompassing one of spaced
portion 32 between the walls of the opening 33 and the
parts provided on each foot piece.
portion 32 is thus clamped tightly under compression.
Another object is to provide a scratcher device of the
Circumferentially extending protector ribs 38 are pro
type described which is particularly well suited for eco
vided on the collar halves as shown in FÍGURES 1«4,
nomical manufacture on a quantity production basis.
and similar continuous protector ribs 39 are provided on
Other and more detailed objects and advantages will
that form of the device shown in FIGURE 5. The collar
appear hereinafter.
ña as shown in FIGURE 5 is formed from a single
ln the drawings:
metal strip with the ends joined at 46 to form a single
FlGURE 1 is a plan View showing a preferred embodi
endless ring. The mounting of the scratcher finger
40
ment of this invention.
assemblies 2da is identical to that described above.
FIGURE 2 is a side elevation thereof, the scratcher
In that form of the invention shown in FIGURES 6
fingers being roken off for clarity of illustration.
and 7 the carrier takes the form of a longitudinal member
FIGURE 3 is a sectional elevation taken substantially
1lb adapted to be fixed to the outer surface or” a well
on the lines 3~3 as shown in FIGURE 2.
pipe by welding d2. The scratcher finger assemblies 29h
FIGURE 4 is a sectional detail taken substantially on
the lines 4_4 as shown in FIGURE 2.
FIGURE 5 is a plan View showing a modified form of
my invention.
FiGURE 6 is a side elevation showing a further
extend in a longitudinal series on the member 1lb and
are mounted in the manner described above. Each of
the retainers 3de extends in a longitudinal direction. A
Referring to the drawings7 the carrier generally desig
nated .ft-»7, comprises a cylindrical collar lf defined by
and any of these may be employed on the types of car
2t) is mounted on the outer surface 2l of the collar il.
connector 29a'.
protector rib 39h extends continuously along one side
50 of the member lib and a smaller rib 43 extends along the
modification.
other side of the member 1lb. The ribs provide protec
FIGURE 7 is a sectional detail taken substantially on
tion for the coil springs of the assemblies E-tlb, and the
lines ’7--~7 as shown in FIGURE 6.
.
longitudinal rib 43 is relatively small to avoid interfer
FlGURE 8 is a fragmentary side elevation of a portion
ence with flexing action of the scratcher fingers.
of the device shown in FIGURE 2.
FIGURES 9, l0 and 11 show modifications in the
FIGURES 9, l0, and 1l are views similar to FIG
mounting of the scratcher linger assemblies on the carrier,
URE 8 showing modifications.
riers shown in FIGURES 1_4, FiGURE 5, and FIGURES
6, 7. in FIGURE 9 the spaced parts 28e are not parallel
cooperating halves l2 and t3 which are substantial dupli
cates. Aligned hinge elements le and l5 at the ends 60 but converge in a direction opposite to the projection of
the scratcher fingers 22C from the coils 23C. The central
of the collar halves are connected by hinge pins lo and
portion 32C of the retainer Eile is clamped under lateral
f7. Either one of these hinge pins may be axially re~
compression as described above.
moved so that the collar halves may be opened up to
in FiGURE l0 the supporting legs 25d are axially
permit lateral application to a well pipe. The pin is
aligned but the foot piece 27d does not have any parts
then reinserted into position and secured by any con
which are parallel. instead, the foot piece is provided
venient means (not shown).
with concave curved parts 2da' joined by convex curved
A circumferential series of scratcher finger assemblies
Each of
a single
includes
coil 23,
In FIGURE 11 the offset foot piece 27e projects in the
the scratcher finger assemblies is formed from
continuous length of wire. Each assembly 2t) 70 same direction as the projection of the scrat-cher fingers
a pair of scratcher fingers 22 extending from a
22e from the coils 23e, and the spaced parts 23e are not
Zd. The coils have parallel axes and are of
parallel but converge at an angle.
3,070,168
In each of the forms of the invention described above,
the retainers are cut and formed in punch press operations
witho-ut requiring any welding, and the number of sepa
7. In a well bore cleaning scratcher, the combination
of: a longitudinal metallic carrier adapted to be fixed
rate parts is reduced to a minimum.
ries of scratcher finger assemblies mounted upon the car
rier, each of the assemblies includinfy a pair of coils, each
These features are
important because they make it possible to produce the
device economically on a quantity production basis.
Having fully described our invention, it is to be under
stood that we do not wish to be limited to the details set
forth above, but our invention is of the full scope of the
appended claims.
We claim:
1. In a well bore cleaning scratcher, the combination
of: a metallic carrier adapted to be mounted upon a wcll
pipe, a series of scratcher finger assemblies mounted upon
the carrier, each of the assemblies including a pair of coils,
each coil having a scratcher finger projecting from one
end thereof and a Support leg projecting from the other
upon the outer surface of a well pipe, a longitudinal se
coil having a scratcher finger projecting laterally from
one end thereof and a support leg projecting from the
_other end thereof, an offset foot piece joining said sup
port legs, cach foot piece having spaced parts joined by
a connector, a plurality of retainers on the carrier, one
`for each scratcher finger assembly, each retainer com
prising a longitudinal strip of metal sheared on two edges
from the carrier and deformed outward therefrom to
form two loops at spaced locations, the ends of each strip
remaining integrally joined to the carrier and the cen
tral portion thereof being clamped between the edges
end thereof, an offset foot piece joining said support legs,
each foot piece having spaced parts joined by a connector,
of the opening in the carrier resulting from formation
of the strip, cach of the loops encompassing a portion
of one of the spaced parts of said foot piece, the carrier
a ’plurality of retainers on the carrier, one for each
having substantially cylindrical outer surfaces adjacent
scratcher finger assembly, each retainer comprising a strip
of metal sheared on two edges from the carrier and de
formed outward therefrom to form two loops at spaced
each edge of each said strip, the said support legs, spaced
parts, and connector of each scratcher ñnger assembly
`being clamped in contacting relation with said outer Vsur
locations, the ends of each strip remaining integrally
faces by said loops.
joined to the carrier and the central portion thereof being
clamped between the edges of the opening in the carrier
resulting from formation of the strip, each of the loops
encompassing a portion of one of the spaced parts of
8. ln a well bore cleaning scratcher, the combina«
tion of: a metallic carrier adapted to be mounted upon
said foot piece, the carrier having substantially cylindrical
a well pipe, a series of scratcher linger assemblies
mounted upon the carrier, each of the assemblies includ
ing a pair of coils, each coil having a scratcher finger
outer surfaces adjacent each edge of each said strip, the 30 projecting from one end thereof and a support leg pro
support legs, spaced parts, and connector of each stratclier
jecting from the other end thereof, the support legs on
finger assembly being clamped in contacting relation with
each said assembly being symmetrically positioned with
respect to said scratcher fingers, an offset foot piece
said outer surfaces by said loops.
joining said support legs, said foot piece, support legs,
2. The combination of kclaim 1 in which the support
35 coils and scratcher fingers of each said assembly being
legs are axially aligned.
formed of a single length of wire, each foot piece having
3. The combination of claim 1 in which the support
legs are axially aligned and wherein the spaced parts of
spaced parts joined by a connector, a plurality of retainnv
the foot piece are parallel.
ers on the carrier, one for each scratcher finger assem
4. rl`he combination of claim 1 in which the support
bly, each retainer comprising a strip ofmetal sheared
legs converge in a direction opposite to the direction of 40 on parallel edges from the carrier and deformed outward
projection of the scratcher fingers from the coils.
therefrom to form two loops at spaced locations, the
ends of each strip remaining integrally joined to the
>5. The combination of claim l in which the foot piece
carrier and the central portion thereof being clamped
is 'offset in the same direction as the scratcher fingers, with
respect to the support legs.
between the parallel edges of the opening in the carrier'
resulting from formation of the strip, each of the loops
6. In a well bore cleaning scratcher, the combination
encompassing a portion of one of the spaced parts of
of: a cylindrical metallic collar adapted to be mounted
said foot piece, the carrier having substantially cylin
upon and to encircle a well pipe, a circumferential series
drical outer surfaces adjacent each edge of each said
of scratcher finger assemblies mounted upon the collar,
strip, the said support legs, spaced parts, and connector
each of the assemblies including a pair of coils, each coil
of each scratcher finger assembly being clamped in con
having a scratcher finger projecting from one end thereof
tacting relation with said outer surfaces by said loops.
and a support leg projecting from the other end thereof,
9. The combination set forth in claim 8 in which the
an offset foot piece joining said support legs, each foot
carrier comprises a cylindrical collar adapted to encircle
piece having spaced parts joined by a connector, a
a well pipe, and wherein the retainer strips extend axi
plurality of retainers on the collar, one for each scratcher
ally of the collar.
finger assembly, each retainer comprising a strip of metal
10. rfhe combination set forth in claim 8 in which the
sheared on two edges from the collar and deformed out
carrier comprises a longitudinal member adapted to be
ward therefrom to form two loops at spaced locations,
fixed to the outer surface of a well pipe, and wherein
the ends of each strip remaining integrally joined to the
the retainer strips extend longitudinally of said member.
collar and the central portion thereof being clamped be
tween the edges of the opening in the collar resulting from 60
References Cited in the file of this patent
formation of the strip, each of the loops encompassing a
portion of one of the spaced parts of said foot piece, the
UNlTED STATES PATENTS
collar having substantially cylindrical outer surfaces ad
2,881,839
Wright et al. ________ __ Apr. 14, 1959
jacent each edge of each said strip, the said support legs,
2,881,840
Wright et al. ________ __ Apr. 14, 1959
spaced parts, and connector of each scratcher finger as
FOREIGN PATENTS
sembly being clamped in contacting relation with said
outer surfaces by said loops.
1,188,046
France ______________ __ Mar. 9, 1959
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