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Патент USA US3022028

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Feb. 20, 1962
l.. K. KNIGHT
3,022,018
RENEWABLE TIP HAMMER ASSEMBLY
Filed July 19, 1960
LLOYD K'. KNIGHT,
BY
¿l2
‘W ‘íwwHTT’Y
United
arent
””1C@
1
3,022,018
RENEWABLE TIP HAiVilVtER ASSENIBLY
Lloyd K. Knight, Columbus, Ohio, assigner to The .leärey
Manufacturing Company, a corporation of Ghia
Filed July 19, 196i), Ser. No. 43,895
4 Ciaims. (Ci. 2411-197)
3,022,9l8
Patented Feb. 20, 1962
2
The hammer assembly 10 has a pair of similar shanks
12, which are spaced from each other in an axial direc
tion. Each shank 12 is formed with a bore 13 at one end
thereof, which is of somewhat larger diameter than the
hammer assembly mounting rod 11, so that the Shanks 12
lit loosely on the rod 11. Upon rotation of the rotor
including the hammer assembly mounting rod 11, the
The instant invention relates to a renewable tip ham
hammer assembly 10 will take a radial position with re
mer for use in a pulverizer, in which the hammer may be
spect to the rotor by operation of centrifugal force.
removed from the shank by which the hammer is mounted 10 When the rotor is stationary the hammer assembly 10 will
in the pulverizer to permit reversal of the hammer or
be suspended loosely on the hammer assembly mounting
replacement thereof.
rod 11.
lt is an object of the instant invention to provide an
A hammer 15 is adapted to be mounted on the lower
ends of the shanks 12. Each shank 12 is formed with a
hammer may readily be removed from the hammer as
tongue 16 which is inset from the opposite faces 17, 18
sembly.
of the shank 12. The hammer 15 includes a pair of re
It is another object of the instant invention to provide
cesses 19, which are spaced from each other, and are
an improved renewable tip hammer assembly in which
complementally formed with respect to the tongues 16 of
the hammer may be readily replaced after it has been
the Shanks 12. The recesses 19 are somewhat larger than
worn down, or may be reversed after one hammer face 20 the tongues 16 for a loose tit of the hammer 15 on the
has been worn down.
Shanks 12. The recesses 19 are spaced from each other,
It is a further object of the instant invention to provide
as seen in FIG. 2, and the walls 20, 21 are provided at
an improved renewable tip hammer assembly in which
the opposite sides of each recess 19.
the elements thereof are maintained in assembly by a lock
The tongue 16 of each shank 12 is provided with a bore
ing pin that may be readily removed for disassembly of 25 22, and each wall 20, 21, at the opposite sides of the re
the elements.
cesses 19, is similarly formed with a bore 23. The sev
It is still another object of the instant invention to pro
eral bores 22, 23 in the shanks 12 and in the hammer 15,
vide an improved renewable tip hammer assembly in
respectively, are of the same diameter and are adapted
which the several elements thereof are maintained in as
to be aligned with each other when the tongues 16 are
sembly by a spring locking pin that may be readily re 30 received within the recesses 19. A hammer supporting
moved for disassembly of the elements.
pin 24 extends through the bores 22, 23 and serves to
A still further object of the instant invention is to pro
connect the hammer 15 to the shanks 12, and thereby sup
vide an improved renewable tip hammer assembly in
ports the hammer 15 on the Shanks 12. Each of the
which the elements thereof are secured in assembly by a
bores 22, 23 has a somewhat larger diameter than the
locking pin, which is enclosed within the hammer to pro
hammer supporting pin 24 for a loose fit of the hammer
tect the locking pin from damage during the operation
supporting pin 24 in the several bores 22, 23.
~
of the hammer assembly.
The hammer 15 is _formed with a cavity 25 disposed
It is also an object of the instant invention to provide
between the inner walls 26, as best seen in FIGS. 2 and 4.
an improved hammer assembly in which the several ele
The hammer supporting pin 24 extends through the cavity
ments thereof are loosely assembled and are secured in 40 25, and is formed with a transversely extending Ibore 26,
assembly by a locking pin ñrmly secured to one of the
which intersects the axis of the hammer supporting pin
elements of the hammer assembly.
24. The hammer 15 includes bores 27, 28, which are
Other objects of the invention will appear hereinafter,
aligned with each other and with the bore 26 in the
the novel features and combinations being set forth in
hammer supporting pin 24. The bores 27, 23 are of
the appended claims.
somewhat larger diameter than the bore 26. A cylin
improved renewable tip hammer assembly in which the
In the accompanying drawings:
drical spring locking pin 29 is inserted into the bore 26
of the hammer supporting pin 24. The bore 26 is of
such diameter that the locking pin 24 must be press
constructed in accordance with the instant invention;
fitted into the bore 26 for securelyl holding the locking pin
FIG. 2 is a rear elevational view, partially in section,
50 29 in the bore 26. The bores 27, 2% in the hammer 15
of the hammer assembly;
FIG. 1 is a side elevational view of a hammer assembly
provide access to the bore 26 for insertion of the locking
FIG. 3 is a sectional view of the hammer assembly taken
on the line 3_3 in FIG. 2;
pin 29 therein, and also permit removal of the locking
pin 29. The spring locking pin 29 is of such length that
FIG. 4 is a sectional view of the hammer assembly taken
on the line 4--4 in FIG. 2;
it extends into the bores 27, 28 of the hammer 15, and
FlG. 5 is a side elevational View, partially in section, of 55 thereby prevents the hammer supporting pin 24 from
working out of the ha-mmer assembly 1l) in an axial di~
a modified form of the hammer assembly constructed in
rection. It will be understood that since the bores 27, 2S
accordance with the instant invention; and
are of somewhat larger diameter than the locking pin
FIG. 6 is a front elevational view, partially in section,
26 there may be some axial movement of the hammer
0f the hammer assembly illustrated in FIG. 5.
Referring to FIGS. l to 4 of the drawings, there is 60 supporting pin 24, the maximum amount of such move
ment being equal to the diñerence in diameter of the
illustrated one embodiment of a hammer assembly 10,
locking pin 29 and the bores 27, 2S. However, such axial
constructed in accordance with the instant invention.
movement o-f the hammer supporting pin 24 is so Small
The hammer assembly 10 is adapted to be utilized in a
pulverizer having a rotor of a known form comprising 65 that there is no possibility of aüecting the assembly of
the hammer 15 on the Shanks 12 as described herein.
several axially spaced rotor discs mounted on a shaft by
The cylindrical spring locking pin 29, which is illus
which the rotor is rotated. A plurality of circumferen
trated in the drawings, is of a type that is formed as
tially spaced hammer rods extend in an axial direction
a tube which is split along one side thereof. In apply
through the rotor discs at positions adjacent the periphery
ing the locking pin to a bore, such as the bore 26, the
of the rotor discs, and the hammer assembly 10 is mount
locking pin 29 is compressed and is thereby secured in
ed on a hammer assembly mounting rod 11, as illustrated
the bore to which it is applied. It will be understood
in the drawings herein.
that the cyiindrical spring locking pin 29, which is illus
8,022,018
3
4.
.
trated in the drawings, is only one exemplary form of
' this device, and other locking pins may be utilized in
practicing the invention disclosed herein.
such size that it is press iitted into the bore 49 to Vbe se
curely held therein.
.
, As'seen inFlGS. 1, 3 and 4, the hammer assembly 10
is adapted toberrevolved by the pulverizer rotor in a
clockwise direction. In operation of the hammer assem
bly 10 the front face 3() of the hammer 15.will be the
operating face thereof, and the rear face 31 of the ham
mer 15 will be an inactive face. The front and rear faces
. 30, 31 of the hammer 15 extend upwardly around the
tongues 16 of theV Shanks 12, and there is provided a
substantial thickness of hammer material around the
tongues 16 to protect the latter during operation of the
,
the bore 49 of the hammer supporting pin 48, and is of
j
.
The cylindrical spring locking pin 54 holds the several
elements of the hammer assembly 35 together by pre
venting axial movement of the hammer supporting pin
48. As seen in FIG. 5, thelocking pin 54 is of such
length, that at the opposite sides of the hammer support
ing pin 4S, the lo-cking pin 54 extends into the bores 5G,
51, 52, 53. Since the bores Sil, 51,52, 53 are of some
what larger dia-meterethan the locking pin 54, there may
be a limited amount of axial movement of the hammer
supporting pin 48, but this will be sosmall as to prevent
the elements of the-hammer assemblyr35 from separating.
i hammer assembly 1Q. As seen in FIG. 4, the opposite
The several elements of the hammer assembly 35 are
ends of the locking pin 29 are disposed a substantial dis 15
loosely assembled with Aeach other to facilitate disassem
tance inwardly from the front and rear faces 30,? 31 of
bly thereof for removal of the hammer 42. The locking
the hammer 15 to protect the locking pin 29 and to pre
pin 54 is compressed when it is secured in the bore 49
ventk damage thereto during operation of the hammer
of the hammer supporting pin 48, and is securely Vheld
assembly 10. Thus, it isV always possible to readily re
move the locking pin 29. The several elements of the 20 in the hammer supporting pin 48. However, the locking
pin 54 is loose with respect to the shank 37 and the
hammer assembly 10 are loosely assembled with respect
hammer 42, and may be readily removed from the ham
to each other to prevent the elements from freezing to
mer supporting pin 48 throughrthe bores 50, 51, 52, 53
gether as a result of the impact forces brought to bear
which provide access to the'locking pin 54.
on _the hammer assembly 10 during operation of the
As viewed in FIG. 5, the hammer assembly 35 is re
latter. lThis facilitates disassembly of the elements of 25
the -hammer assembly 10. The Shanks 12 and the ham
f volved in a clockwise direction, asY indicated by the arrow.
- mer15 are symmetrically formed so thatrwhen the front
The hammer 42 has a front face 55 and a rear face 56. Y
VIn the operation of the hammer assembly 35, as de
lface 3G of the hammer 15 is worn, the hammer 15 may
scribed, the front face 55 Vof the hammer 42' will be the
be removed from the Shanks 12 and replaced on the
Shanks 12 in reverse position, whereby the rear face 31 30 operating ,face of the latter, and the rear face 56 will
be the inactive face thereof. The hammer 42 andthe
will then be the operating face of the hammer 15.
In` FIGS. 5 and 6 there is illustrated a hammer assem- Y
shank 37 are each symmetrical, so that when the front
face 55 has become Worn the hammer 42 may be readily
bly 35 which is anotherembodiment of the instant in
vention, and is a modified form of the structure illus
removed from the shank 37 and re-assembled in reverse
Vtrated in FIGS. 1 to 4. ç The hammer assembly 35 is 35 position Vto make the rear face 56'the operating face of
adapted toV be mounted on a hammer assembly mounting
the hammer‘42. When both faces 55, 56 of the hammer
rod 36 which is included in a'pulverizer rotor `by which
42 have become worn, the hammer 42 may be replaced
the hammer assembly 35 is revolved.
by another hammer. The hammer faces 55, 56 extend
The hammer assembly 35 includes a single shank 37
upwardly around the tongue 39 of the shank 37 and
formed with a bore 38 at one end thereof by which the 40 provide a substantial thickness of hammer material around
hammer assembly 35 is mounted on the rod 36. The
the tongue 39xfor protection of the latter during operation
bore 38 is of somewhat larger diameterA than the rod 36
of the hammer assembly 35. Since the locking pin 54 is
«forrloosely mounting the hammer assembly 35 on the
inset from the hammer faces 55, 56, it also is protected
rod 36. In operation of the hammer assembly 35 it
during operation of the hammer.V ~
'
. ,
will take a radial position with respect to the pulverizer 45
By the instant invention there is provided an improved
rotor by the action of centrifugal force.
Y
renewable tip hammer _assembly in which the hammer may
The shank 37 includes a tongue 39 which is insetfrom
be readily removed from the shank on which therhammer
the opposite faces 40, 41 of »the shank 37. The hammer
is mounted. The several elements of the hammer as
42 is for-med with a centrally disposed recess 43, which
sembly are held together by a locking pin that may be
is adapted to receive the tongue 39.V The recess 43 is 50 readily removed from the assembly, when Vthe hammer
complementally formed with respect to the tongue 39,
hassbecome worn and it is. desired to remove the latter
and is somewhat larger than the `tongue 39 for a loose
from the hammer assembly. The locking pin is protected
íit of the tongue 39 in the recess 43. The hammer 42
by the hammer during the operation of the hammer as
includes walls 44, 45 disposed at opposite sides of the
sembly so that it cannot be damaged, thereby facilitating
recess 43, and serving to protect the tongue 39 during 55 the removal of the locking pin when it is desired Yto dis
operation of the hammer assembly 35.
'
Y
A -bore 46 is formed in the tongue 39, and bores 47
are formed in the walls 44, 45. The several bores 46, 47
assemble the hammer assembly. Y
Y
f
ObviouslyV those skilled in the art may'make various
vchanges in the details and arrangement of parts without
are axially aligned with each other and are of the same
departing from the spirit and scope of the invention as
diameter. A hammer supporting pin 4S extends through 60 defined by the claims hereto appended, and applicant
the bores 46, -47 for joining the hammer 42'to the shank
thereforewishes not to Ybe restricted to the precise con
37 and supporting the hammer 42 on the shank 37.
struction herein disclosed.
î
.
The bores 46, `47 are of somewhat larger diameter than
Having thus described and Vshown an embodiment of
the pin 48 for a loose ñt of the latter in the bores 46, 47. '
the invention, what it is desiredto secure by Letters
The hammer supporting pin 48 has a transversely ex-Y 65
Patent of the United States is:
,
tending bore 49 which intersects the axis of the pin 48.
1.
A
renewable
tip
hammer
assembly
for a pulverizer
The tongue 39 of the shank 37 is formed with bores
comprising a pair of Shanks for mounting VaV hammer in
50,51 at the opposite sides of the hammer supporting
pin 48 and disposed in alignment with the bore 49. The 7 ' Vthe pulverizer, a hammer adapted to be secured to the
hammer 42 is formed with bores 52, 53 which are also 70 Shanks, each of said Shanks including a hammer mounting
tongue, said hammer including a pair of lspaced recesses
aligned with the bore y49 in the hammer supporting pin
48, as well as with the bores 50, 51 in the tongue 39.
The several bores 50, 51, 52, 53 are of somewhat larger
diameter than the bore 49 and provide access to the lat
each adapted to receive one of said tongues, a hammer
supporting pin extending through'the hammer and said
tongues and loosely received in the hammer and tongues
ter. A cylindrical spring locking pin is inserted into 75 for> holding Vthe hammer on the Shanks, a transverse bore
5
6
in said hammer supporting pin, a locking pin secured
and tongue and loosely received in the hammer and tongue
in said transverse bore to maintain the hammer supporting
pin in assembly with the shanks and hammer, said trans
in said hammer supporting pin, a locking pin secured in
verse bore and locking pin being disposed intermediate
the hammer recesses, and a bore in the hammer aligned
with said transverse bore to provide access to said trans
for holding the hammer on the shank, a transverse bore
said transverse bore to maintain the hammer supporting
pin in assembly with the shank and hammer, a bore in
the hammer aligned with said transverse bore to provide
verse bore for insertion of the locking pin into said trans
access to said transverse bore for insertion of the lock
verse bore, said hammer bore being substantially larger
ing pin into said transverse bore, and said hammer bore
than the locking pin.
being substantially larger in diameter than the locking pin.
2. A renewable tip hammer assembly for a pulverizer 10
4. A renewable tip hammer assembly for a pulverizer
comprising a shank for mounting a hammer in the pul
comprising a shank for mounting a hammer in the pul
verizer, a hammer adapted to be secured to the shank,
verizer, a hammer adapted to be secured to the shank,
said shank including a hammer mounting tongue, said
said hammer including a recess to receive said shank, a
hammer supporting pin extending through the hammer
mer supporting pin extending through the hammer and 15 and shank for holding the hammer on the shank, a trans
tongue and loosely received in the hammer and tongue
verse bore in said hammer supporting pin, a spring locking
hammer including a recess to receive said tongue, a ham
for holding the hammer on the shank, a transverse bore
in said hammer supporting pin formed on an axis inter
pin press fitted in said transverse bore and secured therein
to maintain the hammer supporting pin in assembly with
the shank and hammer, and a bore in the hammer aligned
secting the tongue, a locking pin secured in said transverse
bore to maintain the hammer supporting pin in assembly 20 with said transverse bore to provide access to said trans
with the shank and hammer, and aligned bores in the
verse bore for press littîng the locking pin, said hammer
hammer and tongue formed on the axis of said transverse
bore and aligned therewith to provide access to said trans
verse bore for insertion of the locking pin into said trans
verse bore, said aligned bores in the hammer and tongue 25
being substantially larger than the locking pin.
3. A renewable tip hammer assembly for a pulverizer
comprising a shank for mounting a hammer in the pul
verizer, a hammer adapted to be secured to the shank,
said shank including a hammer mounting tongue, said 30
hammer including a recess to receive said tongue, said
hammer recess and said tongue being of such relative
size that the tongue ñts loosely within the hammer recess,
a hammer supporting pin extending through the hammer 35
bore being substantially larger than vthe locking pin into
said transverse bore.
References Cited in the tile of this patent
UNITED STATES PATENTS
1,166,698
Lincoln _______________ __ Jan. 4, 1916
1,693,058
Shelton ______________ __ Nov. 27, 1928 Y
1,940,116
Brooks ______________ __ Dec. 19, 1933
683,171
891,047
Germany _____________ __ Oct. 31, 1939
Germany ____________ __ Sept. 24, 1953
FOREÍGN PATENTS
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