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Патент USA US3044728

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July 17, 1962
w. J. SACKETT
3,044,718
CHAIN HAMMER MILL
Filed Aug. 21,_ 1958
7 Sheets-Sheet 1
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ATTORNE
July 17, 1962
w. J. SACKETT
3,044,718
CHAIN HAMMER MILL
Filed Aug. 21, _ 1958
‘7 Sheets-Sheet 2
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INVENTOR
war/fer L/.‘ 4522 aka 7‘7‘
July 17, 1962
W. J. SACKETT
3,044,718
CHAIN HAMMER MILL
Filed Aug. 21,_ 1958
7 Sheets-Sheet 3
42+
4
INVENTOR
wa/fe'r (/. 5acA'e/"?
ATTORNEY
July 17, 1962
w. J. SACKETT
3,044,718
CHAIN HAMMER MILL
Filed Aug. 21',» 1958
7 Sheets-Sheet 4
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'
'
'
INVENTOR
' Ufa/74¢‘? cf. sac/rs?" 7"’.
'
ATTORNEY
July 17, 1962
w. J. SACKETT
3,044,718
CHAIN HAMMER MILL
Filed Aug. 21,_ 1958
'7 Sheets-Sheet 5
//A L
was/fer’ (f, Sac/1:277‘
ATTORNE
July 17, 1962
’
w. J. QSACKETT
3,044,718
CHAIN HAMMER MILL
Filed Aug. 2l,_1958
7 Sheets-Sheet 7
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‘ I NVENTOR
BYW'LI//CA%N{
United States Patent O??ce
3,044,718 .
Patented July 17., 19,62
1
FIGURE 12 is a fragmentary elevational view of a
3,044,718
modi?cation of the grid bar member support.
CHAIN HAMMER MILL
Walter J. Sackett, Baltimore, Md., assignor to The A. J.
Sackett 8: Sons Company, Baltimore, Md., a corpora
tion of Maryland
FIGURE 13 is a fragmentary partial elevational and
partial sectional view of the grid bar members and the
supports shown in FIGURE 12 in their assembled posi
_
Filed Aug. 21, 1958, Ser. No. 756,444
6 Claims. (Cl. 241-189)
tion.
.
FIGURE 14 is a sectional view on line 14—14 of FIG
URE 13.
This invention relates to a mill for cracking or breaking
FIGURE 15 is a partial transverse sectional view show
up rock formations such as phosphate rock which is used 10 ing a modi?cation of the curtain, on line 15—-15 of
extensively in the making of fertilizers.
FIGURE 16.
'
One of the objects of the invention is to make a mill
FIGURE 16 is a sectional view on line 16—16 of FIG
which will be very inexpensive in the initial construction
URE 15.
'
and in which the wear portions cannot only be cleaned
In ,the drawings similar numerals refer to similar parts
readily, but replaced or repositioned to present new wear 15 throughout the several views.
surfaces to continue the life of the mill substantially
- The rotary shaft 1 is mounted in bearings 2 and. rotated
inde?nitely.
by a belt 3 on pulley 4. The casing for the mill is made
Another object of the invention is to make a mill which
up of three sections, a lower section 5, an upper quarter
is simple in construction and assembly and yet very rugged
section 6 and a forward quarter section 7. The sections
so that it will undergo long use without attention or 20 have ?anges 8 extending outwardly thereon to connect
repairs or adjustment.
Another object of the invention is to break large par
the sections together by bolts 9. The upper sections have
a cover 10 bolted to them by bolts 11 and the rear cover
ticles of material and to produce in that breakage as few
section has a chute 12 bolted, to it through which the
?nes or ?nely broken material as possible.
material passes to the mill. The quarter sections 6 or 7
Another object of the invention is to so mount the 25 can either be removed for Working on the interior of r
hammers that they and their supports will not be injured
should excessively large pieces of material pass to the
the mill for cleaning or replacement of parts. Hand
ditlicult to remove.
down between the sides of the housing and the grid struc
ture 21 shown in FIGURES 1, 2, 3, 5 and 6, made of
expanded metal.
holes 13 are placed in the upper forward quarter section
mill.
7 and ther‘forward portion of the lower section 5, the
Another object of the invention is to construct a mill,
covers 14 of which may be removed for similar cleaning
which will remain operative when working on material 30 or replacement operations of less extent than one requir~
which tends, in part, to cake and clog the mill.
ing removal of a quarter section. Hopper wall 15 is in
An object of one modi?cation of the invention is to
the forward upper section of the mill housing‘and; is
utilize a grid surface constructed of an integral piece of
welded to the opposite sides 16 of this section. A similar
a material which is readily available on the market when
wall of greater vertical extent 17 is welded to the sides
35 of the rear quarter sections of‘ the housing and this wall
replacements are required.
An object of another modi?cation of the invention is
has a horizontally extending ?ange 18 with openings be
to construct the grid of bars which may be removed as
tween ?ange portions 18 to permit the passing of ?ne
a group without initially cracking any of the accumulated
materials which may have passed through openings 19 in
rock dust from its adherence on the bars; at times this
hopper section 17, and hopper section 15 has similar
dust solidi?es with atmospheric moisture so that it is very
openings 20 therein through which ?ne material passes
Another object is to so support the bar ends, when bars
are used so as to grid, as to place a minimum of strain
on certain of the parts used to connect the bars with the 45
The rotor or driven shaft 1 has spaced thereon by spac
ing rings 22 a plurality of plates 23 which are of rec
Other objects and advantages of the invention will be
apparent from the following description and the accom~
panying drawings forming a part hereof and in which:
tangular formation and have holes passing through their
mill casing.
centers for the shaft. Plates 23 are alternately placed at
right angles to each other and the ends of each group of
FIGURE 1 is a transverse sectional view substantially 50 plates have center openings therein through which pass
rods 24. These rods 24 have between adjacently-extended /»
through the center of the mill.
FIGURE 2 is a sectional view on line» 2-2 of FIG
ends of the plates circular segment bearing blocks 25 with
an inner circumference like that of rods 24 and they are
free to rotate on the rods. These bearing blocks 25 are‘
FIGURE 3 is a sectional view on line 3—3 of FIG
cut out as shown in FIGURES 7 and 8 at 26 to permit
URE 1.
one end of a chain link 27 to lie therein and the link is
FIGURE 4 is a sectional view on line 4—4 of FIG
welded thereto as shown at 28. The link next to that
URE 1.
welded on block 25 may pass between adjacent plates 23,
FIGURE 5 is a fragmentary elevational view of a
as shown in FIGURE 1 and that link is guided by the
portion of expanded metal forming the grid of one modi
?cation.
60 plates 23 to aid in maintaining the chain normal tov shaft
1, since the ends of the links expand nearly to full width
FIGURE 6 is a sectional view on line 6—6 of FIG
URE 1.
'
_
URE 5. ,
FIGURE 7 is a sectional view through one of the ham
mers of the mill and of its accompanying supports.
' in a line with the link bight.
Each chain has four links
as shown in FIGURES 1 and 2. .The link 29 at the other
end of the chain is permanently attachedrto a hammer 30,
FIGURE 8 is a fragmentary sectional view showing 65 which is a rectangular block 31 with openings 32 and 33
in the end and side wall thereof respectively, through
the mounting of the hammers on their supporting rods.
FIGURE 9 is a fragmentary sectional view of a modi
?cation showing a bar formation for the grid.
FIGURE 10 is a sectional view of the bar supports and
hammers on line 10-10 of FIGURE 9.
FIGURE 11 is a contracted sectional view of the bar
_ supports on line 11-11 of FIGURE 9.
which openings the block is welded to link 29 as shown
at 34. Steel is also deposited as an outer casing 35 on
the blocks to give the. hammers a longlife. The rods 24
70 are fastened in the plates 23 by means of nuts 36 held
from turning by cotter pins 37. As‘ has been shown
especially in FIGURE 2, the hammers of each alternate
row are staggered from those of the adjacent row so that
3,044,718
3
4
a following group of hammers will follow the spacings
between the hammers of the preceding group.
A modi?cation of the chain curtain shown in FIG
Welded to the underside of cover 10 are bars 38 ex
tending transversely of the mill, other bars 39 at right
angles thereto extending parallel to rotor axis, the two sets
of bars forming an egg-crate-like structure with a rod 40
passing across the mill, parallel to bars 39 and supported
in openings in bars 38. This rod is held in place by cotter
pins 41 passing through the ends thereof and it has thereon
?ve depending chains 42 ?tting around sleeves 43 on the,
rod and spaced between bars 38 by spacers 44. Each of
these chains has three links depending down toward the
periphery of the rotor hammers.
URES 3 and 4 is shown in FIGURES l5 and 16 in which
the curtain 71 is made of expanded metal, like that of the
grid 21; in this modi?cation, the curtain 71 is welded to
a tube 72 pivoting on rod 73, mounted between brackets
74 welded on hinged cover 75, hinged at 76 to the mem
ber 77. Hinged cover 75 has a handle 78 by which to
raise it, and it is held down by bolts 79 at its edges and
screws 80 at its free end. A stop plate 81 having angle
10 reinforcing inserts 82 is also welded to the hinged cover
75, to limit the forward swing of the curtain. The curtain
extends adjacent the peripheral line of throw of hammers
3i) and receives and breaks the material thrown by the
hammers 30. Cover 83, the opening 84 in which is closed
At the rear of this set of bars 38 and 39 is another
group of bars 45 and 46, bars 46 extending parallel to 15 by hinged cover 75, and member 77, to which hinges 76
rod 40.
Bars 46 have drilled openings with bolts 47 pass
ing therethrough and held by nuts and cotter pins 43.
There are four of these bolts placed in staggered position
between the chains mounted on rod 40.
These bolts
are ‘welded, are held by bolts 85 to the front wall of the
mill.
It will thus be seen that an economical and rugged mill
is constructed according to this invention which may be
readily repaired and the two formations of the grid can
likewise have sleeves 49 thereon for receiving there
likewise be very economically replaced or repaired. The
around links of depending chains 56 of which there are
phosphate rock for which the mill is primarily designed
four with two links each and they are spaced between the
tends to stick and harden to such a degree that the grid
bars 46 by spacers 51.
must be kept clean and the form of the mounting for the
These depending chains form a chain curtain in close
proximity to the rotating hammers and the hammers throw 25 hammers prevents any accumulation of material on them
would interfere with their effective operation.
the material against the chains to give the material an
It will be appreciated that many changes may be made
initial breaking before it is crushed or cracked on grid 21.
in the mill illustrated without departing from the inven
The grid 21 is made of expanded metal and the metal
tion.
is ?rst slit and then stretched and bent as shown in FIG
URE 5 forming a series of half loops, and then another
What is claimed as new and is desired to be secured by
Letters Patent is:
alternate group of slits is made and the metal further
1. In a breaking mill having a rotor on a transversely
stretched and bent. This forms sections 52 of metal with
a rectangular cross-section as shown at 53 with an outer
extending shaft and carrying swinging hammer elements
edge projecting toward the oncoming hammers.
in a casing with an arcuate grid substantially concentric
The
expanded metal is welded to a framework 54 which is in 35 with and in proximity to the peripheral swing of the
hammers on the forward downward side of their swing
turn bolted to a further framework 55 welded at its sides
and the casing having an upper inlet to the side adjacent
to the sides of the mill housing. As seen in FIGURE 1
the upper swing of the hammers and a layer unobstructed
the expanded metal sections are two, one in the lower
discharge opening spaced laterally from the grid, compris
section of the housing and one in the upper forward
quarter section of the housing. The sections of the ex 40 ing in combination a plurality of substantially rectangular
panded metal may be removed for replacing and they may
be cleaned by the removal of the hand-hole covers 14.
A modi?cation of the grid structure is shown in FIG
URES 9 to 14 inclusive in which bar members 56 extend
concentric to and cross-wise.of the mill parallel to the
plates having openings centrally thereof threaded on the
rotor shaft normal thereto and each alternate plate having
its ends projecting normal from the side of the adjacent
rotor axis, which are likewise placed with a corner of the
the plate projecting ends having openings therethrough
edges of the bars toward the hammers. The bars ?t
shaped openings in one side plate 16 of the housing and
are held in those openings by cotter pins 57. The other
plate, spacers on the rotor shaft between each plate of
an outer diameter substantially the width of the plates,
and rods therein, parallel to the rotor shaft, each rod
having a chain thereover of a plurality of links each of
right angles to its adjacent link between pairs of the pro~
side of the housing 16 has an arcuate slot 58 cut therein 50 jecting ends of alternate plates, the total width of two
and an arc-shaped member 59 with bar-shaped openings
spacers and the thickness of an intermediate plate exceed
ing the width of the chain links with small clearance to
therein and with wings 60 extending from each side
receive between the plates the rod connected and directly
thereof is bolted as at 61 to side walls 16 of the housing.
adjacent links, means bearing on the rods and receiving
The wing members 60 rest on the ?anges 62 projecting
thereover the inner link of the chain to space the chain
from the sides of the housing and the bottom of the arc
links on the rods substantially centrally between adjacent
shaped member 59 rests on ?ange 63 projecting from the
plates and a hammer at the outer end of each chain, said
bottom of the mill housing. These actual resting places
hammers being ?at of face and violently throwing the
for the arc-shaped member take the strain from the bolts
incoming material against the grid, the hammers on each
61 attaching the member to the side wall of housing.
Also a bearing for the arc-shaped member 59 is the ends 60 rod being slightly spaced from each other and the ham
mers on adjacent rods parallel with the rotor shaft longi
64 of the central ?anges 62. Bars 56 are held in the arc
tudinally alternating, to cover the entire grid surface, the
shaped member 59 both by cotter pins 65 and set screws
plural linked chains collapsing upon the encounter by the
66. Upon the removal of the bolts 61 and cotter pins
hammers with excessively large particles of material and
57, because the ends of the bars are clean, the bars
being separately guided by the projecting ends of the
may be removed as a group by removing the arc-shaped
plates between which they are mounted.
member 59 through the opening 58 for cleaning or turn
2. The mill of claim 1 in which the chain link spacing
ing around in their mounting or replacing.
means comprise circularly segmented bearing blocks sub
Rather than have a heavy arc-shaped member 59, a
stantially the length of the space between adjacent pro
plate member 67 can be used in which the bars 59 are
held simply by cotter pins as shown at 68. These plates 70 jecting plate ends bearing on the rods and having the chain
link end therearound a?ixed thereto centrally longitudi
67 are likewise held on the side wall of the housing by
nally of the block.
bolts 69 and here again the group of bars can be removed
together. This plate member 67 likewise has wings 70
3. The mill of claim 1 in which the casing inlet com
to bear upon center ?anges 62 and the lower end bears
prises a hopper having a cover and a chute on the rear
upon lower ?anges 63.
75 of the cover, on the rotor side of the mill adjacent the
3,044,718
upper approach of the hammers and a plurality of chains
depending from the forward under side of the hopper
cover to adjacent the peripheral swing of the hammers,
6. The mill of claim 1 in which the casing inlet com
prises a hopper having a cover and a chute at the rear
of the cover, ‘on the rotor side of the mill adjacent the
the chains being spaced in a row parallel to the rotor
shaft to engage the material thrown by the hammers
prior to its entry between the hammers and grid.
4. The mill of claim 1 in which the grid comprises a
upper approach of the hammers and a curtain mounted . .i
on and depending from the forward under side of, the
hopper cover to adjacent and above the peripheral swing
of the hammers to swing parallel to the mill rotor shaft .
plurality of circularly spaced angularly directed members
to receive the ?rst impact of material thrown ‘by the ham
of rectangular cross-section parallel to the rotor shaft
mers thereagainst.
mounted in the mill casing, an angular edge of each 10
References Cited in the ?le of this patent
rectangular member being inwardly axially directed to
engage the material thrown by the hammers and spaced a
‘UNITED STATES PATENTS
constant distance from the distal ends of the hammers
‘of the rotor, at one side adjacent the grid end the casing
having an arcuate slot therein and an ‘arcuate plate re
15
movably a?ixed to the outside of the casing and covering
the slot, the plate having openings therein to receive there
into and ‘support one end of the members, said members
being removable from the casing in a group through the
slot upon removing the plate.
20
5. The mill of claim 1 in which the grid comprises a
plurality of circularly spaced angularly directed members
of rectangular cross-section parallel to the rotor shaft
mounted in the mill casing, an angular edge of each
rectangular member being inwardly axially directed to 25
engage the material thrown by the hammers and spaced
a constant distance from the distal ends vof the hammers
of the rotor, at one side adjacent the grid end the casing
having an arcuate slot therein and an arcuate plate re
movably affixed to the outside of the casing and covering 30
the slot, the plate having openings therein to receive there
into ‘and support the ends of the members, the casing
129,359
991,477
1,076,128
1,280,838
Moore _______________ __ July 16,
Buchanan _____________ __ May 9,
Quenner _____________ __ Oct. 21,
Rapp _________________ __ Oct. 8,
1872
1911
1913
1918
1,433,042
Sedberry ____________ __'_ Oct. 24, 1922
1,457,210
1,713,507
Crane _______________ __ May 29, 1923
Ammon ______________ __ May 21, 1929
1,752,290
Ammon __________ _______ Apr. 11, 1930
1,839,532
1,872,233
1,889,129
2,095,385
‘Calhoun ______________ __ Jan. 5,
Borton ______________ __ Aug. 16,
Nielsen ______________ __ Nov. 29,
Heisserman ___________ .._ Oct. 12,
2,200,374
2,384,531
2,411,302
2,424,316
2,523,004
2,527,974
Poese ___________ _..'.._.._ May
Bryant ______________ __ Sept.
Stine ________________ __ Nov.
Johnston _____________ __ July
Fowler ______________ __ Sept.
Tostenrud et a1 __________ __ Oct.
1932
1932
1932
1937
14, 1940
11, 1945
19, 1946
22, 1947
19,1950
31, 1950
2,531,732
Hoffman ____________ __ Nov. 28, 1950
2,573,227
Sheeley ______________ __ Oct. 30, 1951
2,666,589
on said ?ange, to support the plate on the ?anges, said 35 2,877,956
Danyluke ___________ __‘__ Jan. 19, 1954
having an outwardly projecting horizontal ?ange centrally
of the plate and the plate having wings thereon, bearing
members ‘being removable from the casing in 1a group
through the slot upon removing the plate.
.
66,580
Sackett ______________ __ 1Mar. 17, 1959
FOREIGN PATENTS
Austria ______________ _._ Sept. 11, 1914
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