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Патент USA US2133212

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c. F. SCHUTTE ET AL
2,133,212 '
' HAMMER ASSEMBLY
Filed Jan. 24, 1938
’
w. “11:2
2,133,212
Patented Oct. 11, 1938
UNITED STATES PATENT OFFICE
2,133,212
HAMMER ASSEMBLY
Charles F. Schutte and’ Herman D'. Schutte,
Snyder, N. Y., assignors of one-fourth to Nellie
.
D. Schutte, Snyder, N. Y.
Application January 24, 1938, Serial No. 186,719
4 Claims. (Cl. 83—11)
This invention relates to hammer assemblies
for hammer ‘mills of the type in which the ham
mers are detachably connected to the outer ends
of swing arms pivoted to a driven rotary member,
5 each hammer being so constructed as to provide
a plurality of impact faces so that when one im
pact face of a hammer becomes worn the hammer
may be repositioned on its swing arm to present
a new impact face. Such a type of hammer is
20 disclosed in Patent No. 1,821,482 of Charles F.
Schutte, dated September 1, 1931, upon which
the hammer assembly of the present invention
represents an improvement.
15
While hammers of the renewable face type
have been successfully employed in hammer
mills, di?iculty is encountered in providing sim
ple and effective means for non-rotatably at
taching the hammers to the swing arms so as to
withstand the repeated shocks to which they
20 are subjected and to permit their quick disen
gagement from the swing arms when it becomes
necessary to change the impact faces of the
hammers.
hammer assembly in which a single hammer is
supported between a pair of swing arms; and
Figure 5 is a plan view of a hammer assembly
similarto that of Fig. 4 but in which a series of
hammers separated by spacing members are sup- 5
ported between the swing arms.
In the type of hammer assembly shown in
Figs. 1 and 2 incorporating the invention, a pair
of hammers l is carried upon the end of a swing
arm 2 which latter is pivoted by means of a pin
3 to a driven rotary member 4. The hammers
are each provided with four equidistantly spaced,
radially extending legs la. providing a corre
sponding number of impact faces lb. In accord
ance with the usual mode of hammer mill oper
ation, when the rotary member 4 is operated,
centrifugal force throws the swing arm 2 out
wardly and causes the hammers to impart blows
with crushing force to: the material contained
within the crushing chamber of the mill, not 20
shown.
,
In order to permit the repositioning of the
hammers upon theswing arms so as to bring a
new impact face of a hammer into operative posi
tion after one of the faces has become worn, it is
usual to provide a detachable connection for
nonrotatively retaining the hammers in assem
bly with their swing arm. According to the pres
ent invention there is provided a connection
which
may take the form of that best illustrated 30
30 the mill. An advantageous feature of the in- . in Fig. 3 and comprising a pin 5 of square trans
vention is the adaptability of the connecting
verse cross-section and having an axial inter
means to different types of hammer assemblies
nally threaded bore 6 extending throughout its
in which either a single hammer or a plurality of
hammers arranged in parallel is carried at the length, a pair of screws 1 having enlarged clampi
ing heads ‘la and collars 8 adapted to encircle
outer end of a swing arm or between a pair of
the screws and provide countersunk seats 9 for
Swing arms pivoted to the rotary member.
Another object of our invention is to provide the screw heads.
As best shown in the cross-sectional view of
connecting means for the hammers which pro
ject only a small distance beyond the lateral Fig. 2, the swing arm 2 and the pair of hammers
I located upon opposite sides of the arm are pro 40
hr. surfaces of the hammers or the swing arms so
as to permit the swing arms to be assembled in vided with registering square shaped openings of
a size just su?icient to pass the square pin 5.
closely spaced relation on the rotary member‘.
Other objects and advantages will be apparent The pin is of a length so as to terminate approxi
from the following detailed description of several mately flush with the flat outer faces of the
It is an important object of our invention to
N) CA provide a quickly releasable connection for at
taching the hammers to their swing arms which
is composed of a minimum number of parts and
so arranged as to be protected against ?ying
lumps of material in the crushing chamber of
preferred embodiments of the invention, refer
ence being had to the annexed drawing, in which:
Figure 1 is a side view of a hammer assembly
of the type in which a pair of'hammers are
mounted on the end of a swing arm;
Figure 2 is a longitudinal cross-sectional view
of the hammer assembly of Fig. 1 viewed at right
angles thereto;
Figure 3 illustrates the various parts of the
hammer connection;
'
Figure 4 is a plan view of a di?erent type of
hammers.
The
collars
are
slipped
over . the 45
shanks of the screws and the screws then thread
ed into the bore of ‘the pin, as by means of a
screw driver engaging kerfs 10 in the heads of the
screws, until their heads tightlyengage the bot
toms of the seats 9.
This causes the collars 8
to be drawn into clamping engagement with the
hammers and prevents endwise displacement of
the pins in their openings.
When so assembled with the swing arm the
hammers are positively restrained against rota
2
2,133,212
tion by means of the square pin engaging com
plementary openings in the hammers and swing
arm. At the same time it is only necessary when
one impact face of a hammer becomes worn to
remove the screw 7 which holds the hammer in
association with the swing arm, together with its
. collar 8, slip the hammer from the end of pin 5,
turn the hammer through 45 degrees to bring a
new impact face to operative position and then
10 reclamp the hammer on the swing arm in its new
position. Likewise the hammers may be entirely
reversed in position as occasion demands so as to
make available four additional edges of their
impact faces, each hammer thereby furnishing
15 eight grinding positions upon their four impact
faces.
In Fig. 4 is shown another form that the in
vention may assume. In the hammer assembly
of this ?gure a single hammer 20 of the multiple
20 face type is located between and at the outer
ends of a pair of companion swing arms 2|. The
hammer is non-rotatably and detachably secured
to the swing arms by a connection corresponding
to that disclosed in Fig. 3. This assembly differs
25 in no essential respect from that previously de
scribed except that a square pin 22, correspond
ing to pin 5 of the assembly of Figs. 1 and 2, ex
tends through aligned openings in the two swing
arms and hammer.
The pin is retained in asso
30 ciation with the swing arms by screws 23 en
circled by collars 24, corresponding to the screws
1 and collars 8 of the aforementioned ?gures.
The screws are threaded into opposite ends of a
central bore 25 in the pin and their enlarged
heads seat within counter-sinks in the collars,
as indicated in dotted lines, so as to retain the
pin against endwise movement.
Another embodiment of the invention is shown
in Fig. 5 which discloses a hammer assembly
40 which partakes of the nature of both of the ham
mer assemblies previously described. This as
sembly comprises a pair of swing arms 30 (al
though any suitable number of swing arms may
be provided at spaced intervals) between which
arms are assembled a series of hammers 3| of
the multiple face type. A square pin 32 passes
through corresponding openings in the swing
arms and hammers and its ends project a suf?
cient distance beyond the outwardly disposed
50 sides of the pair of swing arms to allow additional
hammers 3Ia to‘ be fitted thereover. Headed
screws 33 encircled by collars 34 (corresponding
to the screws 1 and collars 8 of the embodiment
of Figs. 1 and 2) are axially threaded into a cen
tral bore in the pin and clamp the collars against
the sides of the hammers 3la. For uniformly
spacing apart the series of hammers located
between the pair of swing arms, spacer rings 35
centrally provided with square openings passing
the pin 32 are positioned between adjacent ham
mers.
It will be apparent from the embodiments of
the invention described above that the hammers
are positively locked against rotation upon the
65 ends of the swing arms and that in every instance
the square pins are enclosed throughout their
length and protected from ?ying debris within the
mill. This prevents the pins from damage and
avoids chipping and distortion of the corners of
70 the square pin which would interfere with the
ready removal of the pins from the hammers
when changing their impact faces.
The transverse cross-sectional shape of the pin
need not necessarily be square but may be of other
75 non-circular shapes.
This would be particularly
true in the case of hammers having a different
number of impact faces from the four faces dis
closed in the hammers of the above embodiments.
However, in the case of square or rectangular
pins, the four right~angled corners have been
found to afford maximum resistance against
turning of the hammers thereon as well as to
permit their ready assembly with the hammers.
The invention may be embodied in other spe
ci?c forms without departing from the spirit or 10
essential characteristics of the invention, and the
present embodiments are therefore to be con
sidered as illustrative and not restrictive, and all
changes which come within the meaning and
range of equivalency of the claims are therefore 15
intended to be embraced therein.
We claim:
1. A hammer assembly of the class described
comprising a swing arm and means for non
rotatably and detachably connecting a hammer 20
having a plurality of impact faces to the outer
end of the swing arm, said connecting means com
prising a pin of angular transverse cross-section
extending through registering openings corre
sponding to the cross-section of the pin in the 25
swing arm and hammer, means for preventing
endwise displacement of the pin in one direction
and means for preventing endwise displacement
of the pin in the opposite direction, said last
mentioned means comprising a screw axially 30
threaded into the pin and having an enlarged
clamping head and a collar surrounding said
head and providing a countersunk seat for receiv
ing the clamping head of said screw.
2. A hammer assembly of the class described 35
comprising a swing arm and means for non~
rotatably and detachably connecting a hammer
having a plurality of impact faces to the outer
end of the swing arm, said connecting means
comprising a pin of square transverse cross-sec 40
tion extending through registering openings cor
responding to the cross-section of the pin in the
swing arm and hammer and means preventing
endwise displacement of the pin, said last-men
tioned means comprising screws axially threaded
into opposite ends of the pins and having enlarged
clamping heads and collars surrounding the
screws and providing countersunk seats for re
ceiving the clamping heads of said screws, where
by the pin is protected substantially throughout 50
its entire surface against damage.
3. A hammer assembly of the class described
comprising a plurality of swing arms arranged
in parallel and means for non-rotatably and de
tachably connecting a series of hammers each
having a plurality of impact faces to the outer
ends of said swing arms, said connecting means
comprising a pin of angular transverse cross
section extending through registering openings
corresponding to the cross-section of the pin in 60
the swing arms and hammers, spacer members
surrounding the pin and disposed between ad~
jacent hammers and means vpreventing endwise
displacement of the pin, said last-mentioned
means comprising screws axially threaded into
opposite ends of the pins and having enlarged
clamping heads and collars surrounding the
screws and providing countersunk seats for re
ceiving the clamping heads of said screws, where
by the pin is protected substantially throughout
its entire surface against damage.
4. A hammer assembly of the class described
comprising a swing arm and means for non
rotatably and detachably connecting a hammer
having a plurality of impact faces to the outer end 75
2,133,212
of the swing arm, said connecting means compris
ing a pin of angular transverse cross-section ex
tending through registering openings correspond
ing to the cross-section of the pin in the swing
arm and hammer, means for preventing endwise
displacement of the pin in one direction and
means for preventing endwise displacement of
the pin in the opposite direction, said last-men
tioned means comprising a screw axially threaded
'
3
into the pin and having an enlarged clamping
head and a collar surrounding said head and pro
viding a countersunk seat for receiving the clamp
ing head of said screw, said collar being of greater
diameter‘than the maximum transverse dimen
sion of the pin so as to completely cover an end
of the pin.
CHARLES F. SCHUTTE.
HERMAN D. SCHUTTE.
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