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Патент USA US2404775

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July 39, W460
a... s. EHMANN-
2,404,775
HAMMER FOR IMPACT GRUSHERS
Filed Dec.'9, 1941
3 Sheets-Sheet 1
"
LESLIE a. EHMAILVN '
-
INV'E
ATTORNEY.
July 3G,, 1%“
2,404,775
1.. G. EHMANN
HAMMER FOR IMPACT ‘CRUSHERS
Filed Dec. 9, 1941
3 Sheets-Sheet 2
A/ % /
r
l
4
N
ATTORNEY
‘3*
'i
’ L. G, ETH-MANN
5mm FOR IMPACT ciwsnmns
Filed 1M9, 1941. '
24949775?
s Sheds-Sheet s
ATTORNEY‘
2,404,775 .
Patented July 30, 1946
UNITED STATES PATENT‘OFFICE ‘ “
0reg., assignor to
Leslie G. Elimann, Portland,Company,
Portland,
Electric Steel Foundry
0reg., a corporation of Oregon
Application December 9, 1941, Serial No. 422,205
12 Claims. (01. 241-197)
2
The present invention relates to rotary impact
it cannot separate therefrom during operation of
crushers or reducers, and more particularly to a
new and improved hammer for use therein.
the crusher.
tached to the periphery of each disc. The rotor
‘
‘
A further object of the invention resides in the
provision of a new and improved impact hammer
Rotary impact crushers usually comprise a
driven shaft having a plurality of discs arranged
thereon with one or more hammers pivotally at
.
a renewable head so attached to the shank that
havinga renewable‘ head wearing portion which
> is secured to the hammer shank without the use
of separate attaching means.
It ‘is a still further object of the invention to
provide a novel impact hammer of the character
described which is simple and sturdy in construc
tion, which is long lived and economical in use,
and in which the head is so attached to the shank
. element is mounted within a casing including a
plurality of cylindrically arranged breaker bars,
and is driven at high speed so that material fed
thereto is crushed or pulverized between the
hammers and the casing. The hammers usually
are of a one piece construction and, depending
upon the size and capacity of the crusher, are
of relatively massive proportions. Wear occurs
at the outer edges of the hammer heads, and
after a certain period of use the amount of wear
becomes such that the hammer must be replaced.
Since only about ?fteen to twenty percent of the
that it may be renewed or reversed with a rela
tively small expenditure‘ of time.
In accordance with an illustrated embodiment
of the invention, a crusher impact hammer is
provided comprising a hammer head ‘having a
socket‘formed in one surfacethereofincluding
integral portions forming overhanging shoulders.
total mass of one piece hammers has been worn v_~
The head is attached to a shank comprising a
away by use at the time the hammer is replaced,
a relatively high proportion of the metal com
prising the hammer is scrapped. Crusher ham
mers, particularly of the type used for reducing
pair of arms having a ?rst pair of ends coopera
tively arranged in the socket, the arm ends hav
ing opposed lateral projections extending co
operatively beneath corresponding shoulders.
ore, cement and the like, are made of a very T (Lb Ol The arms. are so shaped that they may readily
tough and hardened steel which in itself is very
expensive, and the loss of so great a proportion
be assembled into the head without the need of
special tools or fastening means, and so that when‘
of the metal occasioned by the replacement of
the outer ends of the arms are mounted on the
the entire hammer becomes an item of major
crusher rotor discs, separation of the head from
.30
expense in the maintenance of a hammer mill.
the arms is positively precluded.
It has been proposed to use hammers having
Further objects and advantages of the inven
renewable heads or wearing portions which alone tion will become apparent as the description pro
would need replacement after having become
ceeds, while the features of novelty characteriz
ing the invention will be pointed out with greater
particularity in the appended claims.
In the drawings, Figure l is a fragmentary
worn to an ine?icient condition. Such hammers
as have been devised heretofore have had renew
able heads attached to the shank portion by
means of bolts, rivets, or similar means.
These
require the expenditure of a considerable time to
loosen and replace, necessitating a costly cessa
tion of operation of the mill because of time in
volved in reversing or renewing the hammer
heads. Moreover, because of the extreme condi
tions of vibration and other forces attendant
upon the operation of ‘crushers, such fastening
longitudinal sectional view ‘ of a portion of a
it
means have become loosened or otherwise have '
failed, permitting the release of the hammer and
causing considerable damage to the crusher be
fore it can be brought to a standstill.
A renew
able head hammer for crushers which will with
stand severe service and be incapable of ?ying
apart when in operation has been greatly needed
in the art.
‘
It is, therefore, an object of the present in
vention to provide a new and improved hammer
for rotary impact crushers and the like having 55
crusher illustrating the arrangement of a plu
rality of hammers therein constructed in accord
ance with one form of the present invention;
Figure 2 is a cross sectional view through the
structure illustrated in Figure 1, taken along the
line 2—2; Figure 3 is an exploded view in per
spective of an impact crusher hammer of the type
shown in Figures 1 and 2; Figure 4 is an end view
of the hammer shown in Figure 3; Figure 5 is a
longitudinal view, partly in cross section, of the
hammer assembly shown in Figures 3 and 4;
Figure 6 is an exploded view in perspective of a
hammer constructed in accordance with a modi
?cation of the invention; Figure '7 is an end View '
of the assembled hammer of the modi?cation
shown in Figure 6; Figure 8 is a vertical cross
sectional view. of the hammer, taken along the
4
line 8-—8 of Figure 7; Figure 9 is a cross sectional
The center of the curve it is at some point 32
in the shoulder portion 22, so that the projec
tion 27 of arm 25 may beinserted into the left
View taken along the line 9+9 of Figure 7; Figure
.10 is an end view of a hammer constructed in
accordance with a further modi?cation of the
of the recess ill by rotating the end of arm 25
invention; Figure 11 is an exploded view in per
about the shoulder 22 as indicated by dotted lines
spective of the hammer head and a fragmentary 5 33
in Figure 5.
portion of the shankv arms of the modi?cation
The
innermost ends of the arms 24 and 25 are
shown in.'Figure 10;‘ and, Figures 12 and 13 are
provided with eye openings 34 and 35, respec
end views of structures similar to those illustrated
in Figures 4 and 7, respectively, showing the in 10 tively, for cooperatively receiving a through rod '
such as I5 for securing a plurality of similar
vention as embodied in knives for shredding
hammers to the rotor discs iii of the crusher.
ensilage, sugar cane, pineapple and'o-ther similar
?brous materials.
,
With the arms thus retained in a predetermined
aligned relation of the eyes 34 and 35, withdrawal
of the hook ends of the arms from the hammer
.
Impact hammers embodying the present‘ inven
tion are adapted for use in various types and
15. head is positively precluded.
It is preferred to tie the inner ends of the arms
of illustration one form of hammer of the present '
kinds of crushers or reducers, and for purposes
together to facilitate the assembly of the ham
invention is shown in connection with a crusher >
mers in the crusher. This tying means comprises
of conventional design in the fragmentary views
a keeper 3? inserted through the eyes 34 and
of Figures 1 and 2. The crusher comprises a
casing including a plurality of axially extending 20 3.5 and dropped downwardly into cooperating
slots 38 and
in the arms 25! and ‘Z5, respec
and cylindrically'arranged bars ll. ‘Extending
tively.v The opposite. ends of the keeper 3? are
axially through thercasing is a shaft !2 having
provided with heads ‘i2 and 153 which ?t cooper
a plurality of discs 13 mounted thereon and keyed
atively into recesses provided therefor in the outer
thereto in a spaced apart relation. Pivotally at
surfaces of the ‘arms about the ends of the slots
tached to the periphery of the discs it are a plu
38 and 352. The upper surface of vthe keeper 3?
rality ‘of hammers H comprising, shanks l4 hav- '
is concavely curved so as to conform generally
ing. eyes for cooperativelyreceiving. a through
with the curvature of the eyes 34 and 35. It will »
be understood, however, that little or no‘ wear
will occur'on the. surface of the keeper by virtue
of‘ the fact that due to centrifugal force the
rod idpivotally securing the hammers to the discs
l3; and having heads 18 which, in the extended
position of the hammerarevolve closely adjacent
the bars H of the casing.
It will be understood
weight of the hammer will be borne entirely by
the surface of the eyes opposite the keeper 3?.
In order to facilitate removal of the keeper 3'!
from the slots 33 and, 353, additional recesses 44d
that in operationth‘e"rotohfinoluding the discs 13
and hammers H, ‘is revolved‘. at very high speeds
and hence is subjectedto heavy centrifugal forces,
and that the leading edges of the hammers are
are provided in the outer surfaces of the arms
24 and 25 for the insertion of a punch into an
subject torconsiderable wear under impact with
.the material beingcrushed.
‘ I
'
engaging relation with the lowermost edge of the
The primary feature “of thevpresent invention
resides in the provision of an impactihammer H
orsimilar implement in which'the head portion 40
18 is renewable, and which is removably attached
to the shankportion It in such manner that mis
alignment of’the. arms comprising the shank is
all that is required to remove it therefrom. Dur 45
ing the operation of the crusher misalignment of
keeper heads.
’
‘
In the assembled condition of the hammer the
shank arms extend generallyparallel with respect
to each other and in which relation they are
secured when mounted upon the rotor discs by
means of the through rod l5 extending through
the eyes in the inner ends of the shank arms. In
the operation of the crusher, the hammers will
e maintained in a radially extended position
head therefrom, is precluded, An important ad
with respect to the periphery of the discs, due
vantage o-fthe invention resides in the fact that
the head l3 may be reversed or renewed within 50 to the centrifugal forcev acting outwardly on the
hammers. Depending upon such factors as the
aminimum of time. T
v ‘
.
the shank arms, and consequent removal of the
length and weight of the hammer, the diameter
of the rotor discs, and the speed of rotation of
the rotor, the centrifugal force acting on the
a longitudinal recess W in the inner surface 55 hammers will be relatively great, aside from the
tangential forces resulting from the impact of
thereof and extending longitudinally of the ham
the hammers with the material being crushed.
mer hea/d. Portions 22 and 23 integral with the
The anchorage between the shank
and the
hammer head t8 extend over the opposite ends
head is made rugged and sufIicient-ly strong so
of the recess 2} forming relatively rugged over
Referring to Figures '3 to 5, inclusive, each
hammer H comprises a reversible and renewable
tip or head portion {Shaving a socket formed by
hanging shoulders.
as to be able to withstand anysuch forces as may
The hammer shank com 60 be
imposed upon the unit. Thus the bridging
prises two pieces, namely, a pair of arms 26 and
25 which have a?rst or outer pair’ of ends hav
ing opposed lateral projections 26 and 27 of a
cross section corresponding generally to that of
the" recess ii in head 13. I The arms 2d and 25 65
shoulders 22 and 23 over the opposite ends of
the head recess 2i and the lateral projections 28
and 21 hooking underneath such shoulder por
tions aremade as ‘heavy as may be required.
The centrifugal force acting upon the hammer
head 18 will normally be such as to prevent a
24 being adapted for insertion-?rst, after which
rocking movement thereof on the ends of the
it is moved furthermost to the right, as viewed
shank arms even under the force of impact upon
in Figure 5, with theprojectioh 25 extending co
material being crushed. But in order further to
operatively under the shoulder '23.’ The surface 70 preclude
the occurrence of any such rocking
2V9v of the arm 21% opposite the projection ‘25 is
movement,
the cross section of the recess, 2! in
concavely curved, and the adjacent surface 39
the hammer head, and of the ends of'the shank
of the arm 25 is convexyl'y curved, the two curva
arrns'j?tting cooperatively therein, ‘is generally
vare separatelyv insertable into the recess 2!, arm
tures being similar so thatin the assembled‘ po
'sition of the arms they abut against each other.
‘elliptical‘.injshaner the long axis extending in
‘the longitudirial'direction of ‘the hammer, as
2,404,775
5
viewed, for example, in Figure 4. . It will fur
thermore be observed that this cross section is
somewhat wider at the top than at the bottom,
and with particular respect to the shank arms
the corner between the projections and the ad
joining right angular portion of the shank arms
in Figure 7, so that the lateral projection GI en~
gages under the cooperating overhanging shoul
der 56. The surface of the shank arm end oppo
site the lateral projection 6| is concavely curved
as indicated at 68, while the adjacent surface 69
of the end shank arm 52 is convexly curved to
permit‘ assembly of the last mentioned arm in a
manner similar to that described in connection
with the hammer H of the ?rst modi?cation.
forces concentrated at this point. The opposite
Holding the shank arm 52 in the angular rela
sides of the shank arms 24 and 25 are further 10
tion indicated by dotted lines ‘II, the tip 59, is
provided with shoulders 45 and 41 which, in the
inserted
into the space between the shoulder 55
assembled relation of the hammer, engage against
and the arm 53 and, by rotating the shank arm
the upper edges of the side walls of recess 2| fur
52 in ‘the clockwise direction, as viewed in Figure
ther to preclude relative sidewise movement of
'7, into a parallel overlapping relation with re
15
the head on the ends of the shank arms.
spect to the ?rst arm 53, the projection 59. will
Referring again to Figure 1, it will be observed
move under the overhanging shoulder 55, while
that the distance between the opposite sides of
the adjacent curved surfaces 68 and 59 of the
the pair of shank arms of each hammer is just
shank
arm ends ?t snugly against each other.
somewhat less than the axial spacing between a
The widened inner ends of the shank arms 52
pair of adjacent rotor discs l3 in order to pro 20
and 53 are provided with eyes 12 and ‘i3, respec
vide for free pivotal movement of the hammers
tively, which in the assembled relation of the
therebetween. It will also be observed that the
shank arms align with each other forcoopera
width of the hammer heads [8 is somewhat less
tively receiving a through rod or bolt correspond
than the center plane distance between adjacent
discs l3, but greater than the distance between 25 ing with the rod l5, described in connection with
the hammer of the ?rst modi?cation, ‘for mount
adjacent surfaces of a pair of adjacent rotor discs
ing the hammer on the periphery of the crusher
so as to prevent the hammersfrom being pivot
rotor discs. The inner ends of the shank arms
ally movable into the space between the discs.
being
thus secured in a predetermined aligned
The hammer of the modi?cation illustrated in
is rounded so as to provide greater strength in
the region of the corner against the tension
Figures 1 to 5, inclusive, is designed for mount 30 parallel relation, the‘ head 5| is ?xedly secured
on the opposite ends of the shank arms. By
ing in a crusher in such manner that the wide,
virtue of the web‘ 5'! provided in the head recess
?at side of the hammer is presented ‘for im
54 which is straddled by the corresponding ends
pacting against the material being crushed. In
of the shank arms, lateral movement of the head
a further modi?cation of the invention, illus
with respect to the shank arm ends is positively
trated in Figures 6 to 9, inclusive, a hammer is 35
shown which is adapted for mounting in a
Many other modi?cations of the invention will
crusher in such manner that the relatively nar
readily occur to those skilled in the art. For ex
row end of the hammer head is presented to the
ample, it will be obvious that it is not essential
work.
to the practice of the present invention that the
Referring now to Figures 6 to 9, inclusive, the
ends of the shank arms ?tted into the socket in
hammer of this modi?cation comprises a head
the hammer head be cooperatively convexly and
5| and a two piece shank formed by arms 52
concavely curved, as‘shown in the ?rst two modi
and 53. The inner surface of the hammer head
?cations. If desired, the hammer may be con
5| is provided with a socket in the form of an
structed as illustrated in Figure 10 which is a
precluded.
‘
‘
.
.
o
.
"
elongated recess 54 having shoulders 55 and 55
slight alteration of the design of the second de
integral with the head and overhanging the op
scribed modi?cation. The hammer of this modi
posite ends of recess 54. A web 51 extending
?cation comprises a head 8| and a pair of similar
lengthwise of the recess 54 and perpendicularly
shank arms 82 and 83. The hammer head 8|
from the base thereof divides the recess 54 sub
is similar to the hammer head 5| except that ex
50
stantially centrally. The web 5‘! is integral with
tending centrally upwardly from the base of the
the head at the base of the recess 54, and with
recess 84 and at right angles with respect to the
the opposite shoulders 55 and 56.
web 8‘! is a transverse ridge 88 having oppositely
The shank arms 52 and 53 have a ?rst pair of
curved sides merging smoothly with the base of
ends adapted for ?tting cooperatively into the
the recess. The shank arms 82 and 83 have a
recess 54 in the head 5|, having lateral projec
?rst pair of ends for cooperatively ?tting into the
tions 59 and El, respectively, for ?tting snugly
recess 84 in the head 3| for securing the ham
under the overhanging shoulders 55 and 56. The
mer head thereto. The ends of the shank arms
endsof the shank arms are slotted as indicated
82 and 83 are provided with lateral projections
for
?tting
cooperatively
‘
at 62 and 63, respectively,
89 and 9|, respectively, the ends of the shank
560
over the web 51.
arms being furthermore provided with slots 92
The shank arm ends ?tting into the socket in
and 93 for cooperatively straddling the web 81. It
head 5| may be of substantially the same width
will be observed that the two shank arms 82 and
as that of the head. The inner, widened end
83 are substantially similar to the one shank arm
portions of the shank arms are of a reduced thick
a 52 of the previously described modi?cations.
ness and are so shaped that in the assembled
relation they ?t cooperatively together in an
overlapping relation as illustrated more clearly
in Figures 7 and 8. The opposed edges of the
shank arms 52 and 53 are provided with tapered _
laterally extending ?ange portions as indicated
at 65 and 65, respectively, which strengthen the
tip portions of the shank arms.
’
‘
In assembling the hammer, the shank arm 53
is inserted ?rst into the recess '54‘ in the head_
5| and moved furthermost to the right, as viewed
That is,rinstead of the adjacent surfaces of the
shank arm ends arranged within the head recess
being oppositely curved for cooperatively abutting
together, in this instance these surfaces are both
convexly curved as indicated at 94 and 95, re
spectively, for ?tting smoothly against the oppo
site surfaces of the ridge portion 88 extending
transversely in the head recess ‘84. Thus formed,
the shank arms are insertable separately into the
correspond-ing head sockets by inserting the tips
2,404,775
7
8
' 89 and .9! .?rst into the socket. opening. asby
said overhanging shoulders, said arms being ins
holding'the shankarms at an angle with "respect
sertable separately into said recess, a ?rst of said
thereto, and then pivoting the shank arms up
pair of arms having -a concave’ curved surface
wardly toward each other to the ?nal vertical
opposite the lateral projection thereof, the sec
position, causing the projections 89 and 9I3 to CI ond of said arms having a convex curved surface.
engage underneath the overhanging'shoulders 96
opposite the lateral projection thereof for. abut
and 91,.respectively, of the head.
ting cooperatively against the curved surface of
In'other respects the arms 82 and 83 of this
said ?rst arm when said two arms are assembled
modi?cation are similar to the .arms 52 and 53
in said recess for preventing disengagement of
previously described. It will be obvious that the 1 said projections from vsaid shoulders, the curva
hammer shown in Figures 1 to "5,, inclusive; may
tures of said convex and concave curved surfaces
also be modi?ed in a manner as last described.
being such that-said second of the arms is moved
It will be obvious that the recess in the ham
into assembled relation with the ?rst arm and
mer head forming a ‘socket or sockets for the
head from a position angularly away from said
ends 'of the‘sha'nk pieces and de?ning overhang
?rst arm.
ing shoulders ‘for retaining the ‘enlarged ends of
the shank pieces in place vmay be of still other
con?gurations than those shown. Considerable
?tting :into the head recess. The present inven
tion ‘resides in the provision of a hammer con
struction having a two piece shank, at least
tending laterally therethrough and an adjoining
having integral shoulders of substantially arcuate
one of which shank pieces is insertable into a
contour in opposed relation at oppositegends of
the recess and adjacent said elliptical Opening,
said suspending shank including apair of mem
all'y movable therein to the ?nal position to
bers having complementary shapes comprising
As the
oppositely ‘projecting ends adapted to ,?t into said
shank ‘pieces are .fastenecl'relative to each other
opening and extend practically to the opposite
in ‘the ?nal "assembled relation ‘by ‘means vfor _.
ends thereof when the shank is assembled with
the head, one of said members havingon one
side va concavely curved and substantially ar
cuate surface‘ adapted to ?t the surface ofone
of said shoulders and having .on its opposite side
a second concavely curved surface, the otherof
mounting ‘the hammer on the crusher :rotor, .sep
aration ofithe hammer head from the shank is
positively precluded. Thus the means fasten
ing the head to the shank does not :require the
use ‘of any ‘belts or similar devices :likely to work -
loose during the operation of the crusher. The
head is readily ‘reversible on the shank and, as
required, ‘may be replaced when worn with .a
minimum expenditure of eifort and time.
In Figures '12 and :13 are illustrated shredder 40
and the like, and ‘in which the hammer head
is'provided with knife-like edges for cutting such
material.
Figure 12 illustrates *a shredder ham- 7 '
mer IOI having cutting edges I02 providedon
g
transverse shank receiving recess, said head ‘also
socket provided in the head at an angle with
respect'to the ?nal assembled position and pivot
hammers of the type used in swing hammer
shredders for'reducing ‘chips, bark, cane, paper,
I
mills comprising, in combination, a suspending
shank and a Work performing head replaceably
mounted .on said shank, said work performing
head having ‘a practically elliptical opening ex
variation also is possible in the design of the
shank pieces as well as of the enlarged ends
secure :the head firmly to the :shank.
.
2. A reducing implement for ‘use in reducing
said members having on one side a concavely
curved surface adapted to ?t against the other
of said shoulders and a substantially concentric
convexly curved surface on its opposite side
adapted to ?t closely adjacent said secondcon
cavely curved surface, said other of the mem
bers being insertable into assembled relation with
the head by angular movement about the ,ad
jacent arcuate shoulder surface, and the .end of
said shank practically ?lling said opening and
recess.
its narrow end faces. The shank arms I03 and
3. A reducing implement for use in reducing
‘IM may in all respects be ‘similar ‘to the shank
mills
comprising, in combination, ,a suspending
arms 52 and 53 illustrated in Figures 6 to 9, in
shank vand a workperforming head replaceably
clusive, and are cooperatively ‘received in a Pre .60 mounted on said shank, said work performing
cess I05 in the hammer head IllI :in the man
head having’ an opening extending laterally
ner 'hereinbefore ‘described. Figure 13 illustrates
therethrough and an adjoining transverse
a shredder hammer having'a head I06 which-is,
shank receiving recess, said head also having
an adaptation of the head l8 shown in Figures
integral shoulders of substantially arcuate con
1 to 5, inclusive. The head I06 ‘is mounted‘on 55 tour in opposed relation at opposite ends of .the '
‘shank varms corresponding to, those shown in
recess and adjacent said opening, said suspend
Figures 3 and ‘5, and is provided with cutting
ing shank including ‘a pair of members having
edges - IIJ‘I presented to the work in the same
‘manner'as the impact surfaces :of the ‘head I8.
.Having described the principleof operation ‘of
my invention in ‘What is considered ‘to be oper
ative embodiments thereof, I desire to have it
understood that the speci?c :details describedin
complementary shapes comprising oppositely
projecting ends adapted to ?t into said opening
and extend practically to the opposite ends
thereof when the shank is assembled with the
head, one of said members having on one side
.a .concavely curved surface adapted to ?t ad
jacent the surface of one of said shoulders and
merely "illustrative and that the invention may 65 having on its opposite side ,a second concavely
1be carried :out-in other ways.
curved surface, the other of said members hav
I claim:
ing on one side a concavely curved surface
‘connection with the various lmodi?cations are
1. 5A1‘). impact hammer for rotary crushers
adapted to ?t against the other of saidshoulders
comprising a ‘hammer head, 'an elongated recess
vand a convexly curved surface on its opposite
in the upper surface of said head, a pair of 70 side adapted to =?t closely adjacent said second
,shoulders overhanging ‘the opposite ‘ends of said
1recess,.a pair of arms each having an ‘end ‘ex
tending into corresponding “ends of said recess,
said arm <~ ends having lateral projections ex
tending :"lcoopera‘tively under ‘corresponding of 75
concavely curved surface, said other ofthe mem
bers being insertable into assembled relation with
the head by angular movement about the ad
jacent arcuate shoulder surface.
,4. :Ameducing’ .implementjfor use in ‘reducing
2,4045’? 7 5
1.9
mills comprising, in ‘combination, a‘ suspending
shank and a‘ work performing head replaceably
mounted on said shank, said work performing
head having an opening extending laterally and
an adjoining transverse shank receiving recess,
1.0
‘perform-ing head. comprising a- body-having in
one side thereof a, recess adaptedto conform to
said foot portionswhen the heel surfaces thereof
are. in‘contact; said-‘body, also having; integral
shoulders with opposed arcuate, surfacesadapted
to overlie said toe portions, said, workperforming
‘head being, placed in, interlocked relation 'on'said
shank by angular swinging movement: of said
second of the membersabout thejadjacent?arcu
said head also having shoulders in opposed rela
tion at opposite endsof the recess and adjacent
said opening, said suspending shank including- a
pair of members having complementary shapes
ate surface of one‘of‘ said shoulders to, a position
comprising oppositely projecting ends adapted to 10 .such that said foot portions practically-?ll said I
fit into said opening and extend practically to
recess andnthe toe portions underlie saidgshoul
the opposite ends thereof when the shank is as
sembled with the head, one of said members hav
de'rs.
I,
.
.
i111"
8. A re'ducing‘element for use in a reducing-mill
or ‘the like ‘and comprising, in- combinationha
15
the surface of one of said shoulders and having
suspendingyshank ‘and .a "work- performing head
on its opposite side a concavely curved surface,
replaceably mounted on said shank, said shank
the other of said members having on one side a
including a pair of members having complemen
surface adapted to ?t against the other of said
tary shapes, each of said members: including a
ing on one side a surface adapted to ?t adjacent
shoulders and a convexly curved surface on its
shank arm having at one end an integral foot por
opposite side adapted to ?t closely adjacent said 20 tion comprising an outwardly projecting toe part
concavely curved surface, said other of the mem
bers being insertable into assembled relation with
the head by angular movement about the adja
cent arcuate shoulder surface, and the end of
and an oppositely disposed heel surface, and each
of said members having a curved surface adjoin
ing said shank arm and said outward projecting
toe part, one of said members having a concave
said shank practically ?lling said opening and 25 heel surface, the second of said members having
recess.
5. In a reducing implement for use in reducing
a convex heel surface adapted to ?t snugly adja
cent said concave surface, and said work per
mills, the combination of a suspending shank
forming head comprising a body having in one
comprising a pair of- members having comple
side thereof a recess adapted to conform to
30
mentary shapes and substantially aligned oppo
said foot portions when the heel surfaces thereof
sitely projecting end portions of non-circular
are in contact, said body also having integral
section, one of said members having on one side
shoulders with‘ opposed surfaces adapted to over
a substantially arcuate curved surface adjacent
lie said toe portions, said work performing head
the projecting end portion thereof and on its
being placed in interlocked relation on said shank
opposite side a concavely curved surface, the 35 by angular swinging movement of said second of
other of said members having a substantially
the members about the adjacent surface of one
arcuate curved surface adjacent the projecting
of said shoulders to a position such that said
end portion thereof and a substantially concen
foot portions practically ?ll said recess and the
tric curved surface on the opposite side thereof
toe portions underlie said shoulders.
adapted to ?t said concavely curved surface of
9. A reducing element in accordance with claim
the ?rst de?ned member so that said oppositely
8 wherein said suspending shank is characterized
projecting end portions together form a practi
by having side surfaces of said shank arms
cally continuous end portion of non-circular sec
adapted to overlap in assembled relation and in
tion.
45 a plane substantially longitudinal of said foot
6. In a reducing implement for use in reducing
portion.
mils, the combination of a suspending shank com
10. A reducing element in accordance with
prising a pair of members having complementary
claim 9 wherein the recess in said work perform
shapes and angularly projecting end portions of
ing head is divided by a partitioning wall extend
somewhat elliptical section, one of said members 50 ing between said shoulders, and the foot portions
having on one side a curved surface adjacent
of said shank are longitudinally slotted to fit over
the projecting end portion thereof and on its
said partitioning wall.
opposite side a concavely curved surface, the
11. A reducing element for use in a reducing
other of said members having a substantially
mill or the like and comprising, in combination, a
arcuate curved surface adjacent the projecting 55 suspending shank and a work performing head
end portion thereof and a substantially concen
replaceably mounted on said shank, said shank
tric curved surface on the opposite side thereof
including a pair of members having complemen
adapted to ?t said concavely curved surface of
tary shapes including oppositely offset leg por
the ?rst de?ned member.
tions adapted to overlap in assembled relation,
'7. A reducing element for use in a reducing
each of said members having a foot portion at one
mill or the like and comprising, in combination, 60 end including a heel surface and a toe part pro
a suspending shank and a work performing head
jecting outwardly in a sidewise direction with
replaceably mounted on said shank, said shank
respect to said offset leg portions, each of said
including a pair of members having comple
members having a curved surface adjoining said
mentary shapes, each of said members including 65 projecting toe part, and said foot portions being
a shank arm having at one end an integral foot
portion comprising an outwardly projecting'toe
part and an oppositely disposed heel surface,
slotted intermediate the sides and longitudinally
thereof, said work performing head comprising a
body having in opposite sides thereof similar re
cesses separated by an integral partition, said
and each of said members having a substantially
arcuate surface adjoining said shank arm and
recesses being of a shape closely conforming to
said outward projecting toe part, one of said 70 said foot portions when the heel surfaces are in
members having a concave heel surface, the sec
ond of said members having a convex heel sur
contact and said partition extends through the
slots in the feet, said body also having integral
face substantially concentric with respect to said
shoulders with opposed curved surfaces adapted
arcuate surface thereof and adapted to fit snugly
to overlie said toe portions, said work performing
adjacent said concave surface, and said work 75
2,404,775
.
‘I2
‘'11
head being placed in interlocked relation ‘on said
shank by angular swinging movement of at least
one of said members about the adjacent curved
shoulderisurface and in a direction such that said
oifset leg portions move across one another into
overlapping relation.
12; In a reducing implement for use in a re
' V
ducing mill or the‘ like, the combination'of a re
placeable work‘ performing head adapted to be
carried in’ interlocked relation by a suspending
‘body having top, end and side walls, said side
walls having oppositely facing recesses therein
I)
open at the topand separated by. an integral par
tition adapted to, ?tsaid longitudinal slots, said
‘recesses being shaped to provide shoulders at 0p-'
posite ends adjacent the top wall and adapted to
overlie said oppositely projecting feet on opposite
sides of said partition, the opposed surfaces of
said shoulders being substantially arcuate, and
longitudinally slotted and oppositely projecting
said recesses also being curved to conform to said
feet. in' the assembled relation therewith and to
curved feet swingable into said interlocked rela
tion with the work performing head about axes
_ substantially perpendicular to said longitudinal
feet about the adjacent arcuate shoulder surface
to e?ect the interlocked assembled relation of said
shank composed of a pair of" members having
slot,‘ said‘ work performing head comprising a
permit swinging movement of at least one of said
head ‘and shank.
LESLIE G. EHMANN.
Certi?cate of Correction
Patent No. 2,404,775.
July so, 1946.
LESLIE G. EHMANN
It is hereby certi?ed that error appears in the printed speci?cation of the above
numbered patent requiring correction as follows: Column 10, line 48, for the claim
reference numeral “9” read 8; and that the said Letters Patent should be read With
this correction therein that the same may conform to the record of the case in the
Patent O?ice.
Signed and sealed this 29th day of October, A. D. 1946.
[M]
LESLIE FRAZER,
First Assistant Commissioner of‘ Patents.
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