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Патент USA US2136595

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WL i5» 1938..
Filed sépt. 25, 1937
.Patented Nov. 15, 1938
Hugh L. Rogers, Albion, Pa.
Application September 25, 1937, Serial No. 165,717
9 Claims.
This invention relates to a tool for removing
scale, rust, paint, and the like, from the surfaces
of objects, and particularly from surface areas
Which are not readily accessible to the usual
cleaning tools.
For the purposes of illustration, the present
invention will be described in connection with
the removal of oxide scale from metal welds, its
ing such tools and hammers.
to their action when the weld is in a corner, such
as between three or more angularly disposed met
al plates.
rlî'he present invention has for its principal ob
`iects the provision` of a tool which is arranged
to strike a proper blow for shattering and com
pletely removing the scale fromthe weld surface
without damaging the metal or the Weld; which
notl only shatters and loosens the scale from the
surface but also removes it out of the zone of
operation of the tool; which impels itself along
gated cylindrical weights formed of polished tool
Each of the weights is bored axially from
one end to receive the end‘of one or more asso
ciated wires and the wires are ñxedly secured
to the weights so as to form with their associ
ated weights substantially unitary structures or
inertia chippers.
The length of each of the weights 8 is about
three-quarters of the distance between the vi
bratory anvil 3 and the end plate 5. The weights
are accommodated in the body 2 side by side with
actance forces occasioned by its impact, and at
only slight operating clearance. Thus, each
weight is guided by adjacent weights for recip
a traverse speed as high as is consistent with
rocation endwise within the body and relative
the weld or area being cleaned, due to the re
thorough and efficient cleaning; and which is
to the other Weights, and no weight can move a .
arranged so as to adapt itself to the contour of
the surface from which the scale is to be re
sufiicient distance endwise to pass out of lthe guid
Other objects and advantages will become ap
parent from the following specification, wherein
reference is made to the drawing, in which:
Fig. l is a side elevation of a tool embodying
the principles of the present invention and con
nected to a pneumatic hammer for operation
ranged for connection to the usual pneumatic 5
hammer H in the customary manner of connect
largely to the type of blow imparted thereby and
also to the impossibility of subjecting the weld
paint, rust and the» like, being apparent there
Heretofore, the removal of oxide scale from
metal Welds has been found very diflicult, and
no entirely satisfactory tool therefor has been
provided. Multiple chisels operated by a pneu
matic hammer have been used but have not
proven of sufficient advantage over the usual
hand methods to warrant general acceptance, due
cylindrical sleeve. Integral with or connected
to the body member 2 at one end is a vibratory
anvil 3 which may be in the form of a hard steel
plate. The anvil 3 has a stem 4 which is ar
The end of the body opposite from the anvil
is closed by a suitable plate 5 which may be of
comparatively light metal and which is provided 10
with a plurality of apertures 6 which are pref
erably uniformly distributed about the plate and
extend parallel‘to the axis of the body 2. Chip
ping needles 'l are mounted inthe apertures 6,
respectively, for individual reciprocation there 15
in with respect to each other vand to the body.
Each needle 'l extends from Within the interior
of the body to the outside and is provided with
greatly enlarged butt ends within the body.
These enlarged butt ends are preferably elon
uses for other purposes, such as the removal of
(Cl. 29-81)
ing relation.
The needles l are preferably of piano or spring
wires of about 0.045 inch in diameter. In the
form illustrated, the weights are about 1%," long
and 5%” in diameter, the wires being of suiîicient
length to extend about 4” beyond the plate 5
in their most extended condition.`
The rod 4 is suitably connected to the hammer
H in the usual manner so that the anvil 3 has
Fig. 2 is an enlarged longitudinal sectional view
of the tool illustrated in Fig. 1;
imparted to it the rapid successive impacts ofl
Fig. 3 is a cross sectional view of the tool and
is taken on a plane indicated by the line 3_3
in Fig. 2; and Fig. 4 is a somewhat diagrammatic
illustration of the tool and one of its operating
Referring to the drawing, the tool indicated
generally at I, comprises a body member 2 which
55 is preferably in the form of a relatively heavy
the hammer H. 'I'he hammer is preferably one
capable of striking about 3700 blows per min
ute so that the anvil becomes. in operating ef
fect a vibratory member.
‘ 5.0
The specific dimensions above given have been
found particularly suitable for the removal of
oxide scale at Welded joints between angularly
disposed` steel plates, though obviously varia
tions can be made in the dimensions and rapidity „
of operation of the hammer, depending upon the
striking the weights and impelling the weights
use to which the device is to be put.
and needles endwise toward their working ends.
3. A device for the purposes described compris
ing a body member, said body member having a
portion with holes therethrough, needles ñtting
in said holes for free axial reciprocation and
In operation, the tool is positioned with the
working ends of the needles engaging the weld or
surface to be cleaned.
In case of irregularities
in the contour of the surface, each needle auto
matically accommodates itself to the particular
surface area which it engages so that, regardless
of the irregularities of the surface, each portion
is engaged. 'I'he tool and coaxial hammer pref
erably are tilted at an angle to the plane of the
surface being cleaned, as illustrated in Fig. 4.
The pneumatic hammer is operated, whereupon
having working end portions extending beyond
said portion of the body and having butt end
portions extending in the opposite direction from
said portion of the body, individual weights on
the butt end portions of diiferent needles and a
at the same time effect a lateral whipping action
at their free ends. These concurrent and re
vibratory anvil spaced from said portion of the
body and normally beyond the weights in a direc
tion away from the working ends of the needles,
and arranged for impact with the ends of the 15
weights adjacent to the anvil for impelling the
current impacts and whipping actions shat
ter and immediately remove the scale. Mean
the needles reciprocate rapidly individually and
needles endwise when the needles are in one
while, the tool and hammer creep in a direction
toward the applied force of the hammer, as indi
cated by the arrow A in Fig. 4. This creepage
is such that the operator merely holds the ham
mer lightly in inclined position with the free ends
of the needles 1 against the surface to be cleaned
and as the surface is cleaned, the device creeps
away therefrom onto the contiguous uncleaned
4. A device for the purposes described and
comprising a body member, a plurality of resil
iently flexible needles carried thereby and mov
able relative to each other endwise, weights on
the needles and forming therewith inertia chip
pers, means on the body supporting the chippers
for limited axial movement independently of each 25
other, and a vibratory anvil for impelling the
The particular impact and whipping action for
fracturing and removing the oxide scale is very
30 effective. The particular -impact appears to be
5. A device for the purposes described compris
ing a hollow body having one end in the form of
an anvil, a plurality of free and independently 30
caused by the fact that only one or two of the
weights 8 are. struck by the anvil 3 at any given
instant so that the full force imparted to the
anvil by the hammer is concentrated on one or
Co Ul two needles. The kinetic energy thus developed
in each weight 8 drives the associated needle for
wardly with a sharp and forceful impact which
is concentrated on a very small scale area and is
sufficientr to cause the associated needle to bow
laterally and ilex when the end strikes against the
surface to be cleaned. Reilexure of the resilient
needles drives the weights 8 toward the anvil 3 at
a comparatively high velocity, causing them to
strike the anvil and rebound. The rebounding
force of the weights from the anvil is accom
panied by the additional energy added by another
impact of the anvil, which additional impact aug
ments the striking force of the needles on the
scale. Thus, with a relatively small hammer, very
50 sharp and concentrated blows are delivered to the
surface. The whipping action of the needles lat
erally tends to brush off the scale or material as
soon as it has been shattered by the impact of the
Having thus described my invention, I claim:
l. A device for the purposes described compris
ing a body member, a plurality of iiexible resilient
needles mounted in the body for reciprocatory
movement relative to each other longitudinally,
60 said needles having working ends, a vibratory
chippers axially.
reciprocable weights in the body extending
lengthwise thereof and arranged side by side in
mutually guiding relationship to each other for
maintaining each other in substantially parallel
paths of travel lengthwise of the weights, each of
said weights being engageable at one end with
the anvil when in one position, and relatively
resilient needles operatively associated with the
weights for movement axially thereby when the
weights are impelled in one direction by the 40
6. A device for the purposes described compris
ing a hollow body having one end in the form of
an anvil portion, a plurality of free weights in the
body extending lengthwise thereof and independ
ently reciprocable endwise and arranged side by
side in mutually guiding relation to each other
for maintaining each other in their respective
paths of travel endwise, each of said weights being
engageable at one end with the anvil portion 50
when in one position, means limiting all of the
weights to movement endwise between the same
limits, which limits are spaced apart less than the
sum of the lengths of any two weights, and nee
dles carried by the body and operatively asso
ciated with the weights for movement endwise
thereby in a direction away from the anvil.
7. A scale removing tool comprising a tuft of
elongated resilient members extending freely (30
from a guiding and supporting body in the same
general direction, each capable of reciprocating
anvil positioned in the path of reciprocation of
the needles and arranged for imparting blows
movement in said direction relative to the tuft as
endwise to the needles in spaced relation to their
working ends and in a direction toward the work
reciprocating power hammer for imparting rapid
65 ing ends.
a mass, and means adapted for connection with a
the weights for limited reciprocating movement
endwise movement to different members at diifer
ent times.
8. A scale removing tool comprising in com
bination, a hollow body, a plurality of elongated
resilient members extending freely from the body 70
in substantially the same direction, each capable
of movement in the body into endwise abutment
with a portion of the body, and a portable power
axially of the needles, and a vibratory anvil at
hammer connected to the body in a manner to
2. A device for the purposes described compris
ing a body member, a plurality of relatively resil
ient needles mounted in the body member for
endwise movement relative to each other, said
70 needles having working ends, weights on the op
posite ends of the needles, means for supporting
said opposite ends of the needles positioned for
impart rapid endwise movement to different 75
members at different times, through the interme
diary of said body portion.
9. A device for the purposes described com
prising a body member, a plurality of needles
Ul guided for reciprocatory movement in the body
member and relative to each other lengthwise
of the needles, said needles having Working ends
and each having a movable elongated weight
larger than the Working end and in spaced rela
tion thereto, and an anvil adapted for connection
with a power tool for imparting axially directed
impelling forces to the different needles at differ 5
ent times.
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