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Патент USA US2055265

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Sept- 22, 1936-
c. F. swlGERT, .11R
2,055,265
FLEXIBLE BUCKET TOOTH CONNECTION
Filed Oct. 28, 1955
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2 Sheets-Sheet 1
Sept. 22, 1936.
2,055,265
c. F. SWIGERT. .JR
FLEXIBLE BUCKET TOOTH CONNECTION
Filed Oct. 28, 1935
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Patented Sept. 22, 1936
UNi'rED ’ STATES
PATENT OFFICE
2.055.205
FLEXIBLE BUCKET TOOTH CONNECTION
Charles F. Swlgert, Jr., Portland, Oreg., assignor
to Electric Steel Foundry Company, Portland,
Orez.
Application October 28. 1935, Serial No. 47,051
3 Claims. (Cl. 37-142)
This. invention relates generally to excavat
ing machinery and particularly to a flexible
bucket tooth connection.
The main object of this invention is the re
5 duction in the amount of breakage which ordi
narily occurs when a solid shank is employed.
The second object is to reduce the cost of re
placing a casting in case the tooth point should
become broken or worn away.
l
The third object is the construction of a tooth
connection in which the shank and tooth are
10
separate pieces and the part which requires re
placement, namely, the point, is relatively small;
thereby securing a considerable saving in trans
portation.
-
-
The fourth object is to eliminate the tendency
for the securing wedge to loosen under digging
strains which, if transmitted through a solid
shank, exert a continual vertical pressure against
the side of the wedge. With a flexible shank
20
these strains are absorbed at the ñexible con
nection and no vertical pressure is applied to
the wedge.
The fifth object is the construction of a tooth
25 point in which the shape is such as to insure
a more uniform and dense structure in the cast
- ing than is possible with the old style of heavy
solid shank.
30
35
40
45
50
The sixth object is to improve the point it
self by eliminating a heavy portion of the metal
and making it possible to keep the metal sec
tion quite uniform. When the metal section is
not uniform, some of the parts retain their heat
and plastic condition long after thinner parts
have become solidified, causing cracks and .soit
spots to occur.
The seventh object is to so construct the tooth
that absolute precision is not necessary between
the cored recess and the inserted parts in_order
to secure a proper assembly of the parts.
The eighth object is to so construct the tooth
that the stress on the support for the tooth
point is entirely in tension without any bend
ing, thereby making it possible to make a lighter
metal section than would be necessary where
bending stress must be provided for.
These, and other objects, will become more ap
parent from the specification following as illus
trated in the accompanying drawings, in which:
Fig. 1 is a longitudinal section through a tooth
and support taken along the line l--i in Fig. 2.
Fig. 2 is a section taken along the line 2-2
in F18’. 1.
’
Fig. 3 is a fragmentary perspective view of a
55 point holder.
Fig. 4 is a perspective view of the flexible
tooth point shank.
Fig. 5 is a perspective view showing a tooth
point shank placed in position for insertion into
the tooth point which is shown in cross section.
Fig. 6 is a view similar to Fig. 5 but showing
the tooth point shank partly inserted into the
tooth point.
'
‘ Fig. 7 is a view similar to Fig. 6 but showing
the tooth point shank fully inserted into the 10
tooth point.
Fig. 8 is a section showing the tooth point
shank being inserted into _the point holder.
Fig. 9 is a section taken along the line 9-9 in
Fig. 1.
Similar numbers of reference refer to similar
parts throughout the several views.
Referring in detail to th‘e drawings, there is
shown a point holder Ill which is formed on the
bucket lip H and has projecting from the holder 20
I0 the spaced parallel arms l2 which terminate
in the rounded arms I3. The edges Il of the
arms I2 are somewhat narrower than the thick
ness of the _arms I2 and are provided with the
shoulders I5. Extending through the point hold
er l0 is an opening It which intersects the cored
recess Il which forms a continuation of the
space between the arms i2.
It is desirable to taper the opening i6 to re
ceive the wedge i8 whose point i9 is slit to per
mit the spreading thereof for retaining purposes. Á
It is also desirable to flare the end 20 of the
opening I6, within which flared portion 20 the
parts of the point I9 can be spread.
Referring particularly to the point 2l itself.
this may assume any external shape, but in the
form illustrated the face 22 is in parallelism with
the face 23 of the holder lil and the face 24 is
tangent to the curved side 25 of the holder l0.
The point 2l is provided with a central recess
'26 and the end walls 21 thereof are provided
with the cut out portions 28, which receive the
outer portions 29 of the arms l2. Within the
recess 2B is disposed a web 30 whose outer end
3i is rounded. The web 30 is provided with an 45
opening 32 near the end 33 oí the recess 26.
Referring particularly to the tooth point shank
34, same will be seen to consist of an elongated
forked bar whose ends 35 have inturned lugs 36
formed thereon, which lugs 36 are inclined on the
outer sides 31 to facilitate their reception of the
web 30 when the parts are brought together.
The operation of the device is as follows:
In assembling the tooth point Shank 3l upon
the point 2l the parts are brought into the rela 55
tion shown in Fig. ¿à and the shank Slt is forced
toward the recess 26. causing the ends 85 to sen
arate and finally to latch into the opening @t
as shown in Fig. t. There is a sumclent spring in
Seltiswill
forced
be noted
into that
position
whenWithin
the tooth
the point
point 2i, it
takes a permanent set in a slightly spread posi
tion although it does have
cient spring to
latch the inturned lugs il@ into the opening E322.
However, when the tooth point shank Se is inIl
serted into the recess il, the ends t5 engage the
sides at of the recess il and the lugs t@ are iorœd
the shank 36 to permit this action.
When amembling the tooth point 2i with its at-tached shank 8f3 won the tooth holder iii. it is
only necessary to insert the shank 34 into the
recess» Il and then drive the wedge It into place
and spread the points I9 as shown in Fig. l.
It will be understood that the shank St is very
the point 2i.
loose within the recess Il and that when the
wedge i8 is in place the shank 84 is only in ten
sion and that the interior walls 38 of the point 2i
I claim:
1. A bucket tooth point having a recess in one
end thereof and havingr a perforated web within
bear securely against the edges i4 of the arms i2
of the holder it.
The flexible connection between the point i9
and the shank u permits this bearing to be taken
up evenly on the bearing surfaces of both of the
arms I2, even though these arms are not in exact
relationship with the recess il. When a solid
shank is used the point I9 can be drawn up on the
holder ill in an axial line only, and if one arm l2
is slightly forward of the other, contact will be
taken by this arm only, thus subjecting the arm
to excessive stresses and the shank to a severe
bending.
While I have shown the wedge i8 as being driv
en in from'the top, it is obvious that it could be
30 driven in from the side without departing from
the spirit of this invention. It is also obvious
that this improved point could be used in con
nection >with adaptors such as are now on the
market.
While this point and its fastening have been
together thereby. positively insuring against any
uniatching between the tooth point
.l i Il and t
said recess and a forked shank for said point hav--
ing inturned ends adapted to latch in the perio
rations of said web for the purpose of forming a
loose connection between said point and shank.
2. A bucket tooth point having a recess formed
at one end thereof. two sides of which converge
and having a web formed between said converg
ing sides, said web having an opening through
the inner end thereof, a forked shank for said
tooth having the open ends thereof inturned, said
forked shank being capable of opening sutil;
ciently to permit said web to pass between said
inturned ends and to latch within the opening.
formed within said web.
3. In a bucket tooth of the class described a
point having a tapering recess and having a web
between the tapering sides oi said recess provid
ed with an opening through the inner end of the
web and an elongated forked shank having in
turned latching ends at the open end thereof
adapted to receive said web between same when
said shank is forced into said point and to latch
referred to as a bucket tooth connection, it must
be understood that it is equally adaptable to all
sorts of excavating, road servicing, and agricul ' said inturned ends into said web opening for the
tural machines, such as subsoilers, ploughs, scari- ' purpose of forming a hinged -ioint between said
iiers, dipper type of buckets, drag line buckets, shank and joint.
Scrapers, etc.
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i
L
CHARLES F. SWIGERT, Jn.
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