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Патент USA US3019539

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Feb- 5, 1952
_
F. D. STEPHENSON
3,019,537
KEEPER FOR AN EXCAVATOR TOOTH
Filed Jan. 6, 1959
22
.
INVENTOR.
FERRALD DAN/EL STEPHENSON
BY
95W d ?y?
A T TORNEYS
United States Patent O?tice
3,dl9,537
Patented Feb. 6, 1962
2
3,ttl9,d37
_ QEEPER
AN EXtCAVATtBR TGQTH
Ferrald Daniel
Lakewood, Calif, assignor
to American Brain: Shoe ‘Company, New Yorir, N.Y.,
a corporation of fieiaware
Filed fen. s, 3959, Ser. No. 735,174
3 Claims. {:Cl. 37ml4l2)
My invention relates to semi-permanent retaining means
and is especially concerned with a device particularly
adapted for use in connection with a detachable or re
movable excavator tooth. A device of this sort is shown
as an example in my co~pending application entitled “EX
cavator Tooth,” ?led April 28, 1958, with Serial No.
With the aperture 12 is not necessarily precise, it being
su?icient that a substantial passageway is provided
through the assembled tooth base 7 and tooth tip 8.
To retain the tooth tip on the base there is provided,
pursuant to the invention, a keeper generally designated
lid. This conveniently includes a body in the form of a
wedge usually cast of manganese steel or fabricated of a
good wear-resistant metal. The Wedge contour of the
body 14 is in part defined by a rearward planar face 16
and a forward planar face 17 disposed so that the faces
16 and 17 converge toward the bottom face 18 of the body
14‘. There is provided an inclined planar top surface 19
on the body, The remaining sides are de?ned by parallel
planar surfaces 21 and 22.
731,215, now l’atent No. 2,982,635.
In that environment there is provided a base on which
a tooth tip is removably mounted so that the tooth tip
It is to be understood that the surfaces need not be
precisely planar nor ?at but are as nearly of the indicated
can be removed and replaced when worn. Since ex‘
cavators are subject to very severe usage there has always
variations from mathematically strict contour are im
existed a problem of providing a retaining means or keeper
for the detachable tooth tip effective to hold the tip
?rmly in place during working yet easily releasable with
only ordinary tools available in the field when the tooth
tip must be replaced.
con?guration as commercial requirements dictate. Slight
material. Preferably all of the edges and corners of the
body 14 are rounded. The general size and con?gura
tion of the body 14 are such that vthe body can readily be
introduced through the opening 9 so as to pass through the
aperture 12 and to enter more or less fully into the open~
ing 11. In this position the rearward surface 16 tends to
It is therefore an object of the invention to provide a. 25 abut the adacent portions of the tooth tip 8 de?ning the
keeper which is effective to hold the detachable parts to~
openings 9 and 11 whereas one or more areas of the front
gether during 0 eration yet which is readily and easily
face i7 abut the adjacent area of the portion of the tooth
releasable when the tooth tip is to be removed.
base 7 partly de?ning the aperture 12. if necessary, the
Another object of the invention is to provide a keeper
body 14 is driven substantially into the assembled position
which can readily be used with excavator teeth currently
as shown in FIGURE 1 by a few blows of a hammer on
in use.
the surface 19. It is dislodged from such position by a.
Another object of the invention is to provide a keeper
few blows of a hammer on the lower end 18.
which can repeatedly be utilized and will retain its effec
To provide an improved means for retaining the body
tiveness during such repeated use and over a long period
14 in its engaged position, the body is initially formed with
35
of time.
additional surfaces such as an interior planar surface 26
Another object of the invention is to provide a keeper
merging with return-curved cylindrical surfaces 27 and 2,8,
which is easily manipulated with ordinarily available field
tools.
A still further object of the invention is to provide a
keeper easily fabricated and economically supplied.
Other objects, together with the foregoing, are attained
in the embodiment of the invention described in the ac
the surface 26 being substantially planar and parallel to
the surface 16. The inturned surface 27 merges with an
40 inclined surface 29 which in turn merges with a surface
31. The inturned surface 28 merges with a surface 32 sub
stantially parallel to the surface 31. The various surfaces
from 26 to 3-2 de?ne what is in eifect an interior cavity
open at both sides of the body 14- and also opening be
tween the surfaces 31 and 32 on the forward side of the
45
FIGURE 1 is a side elevation of an excavator tooth,
body 14. There is thus provided a relatively large interior
portions being broken away on a longitudinal, vertical
cavity opening outwardly and forwardly through a restricb
section to disclose in side elevation a keeper according to
ed opening.
companying description and illustrated in the accompany
ing drawings in which:
the invention in its useful environment;
FIGURE 2 is a side elevation to an enlarged scale of
the keeper;
'
FIGURE 3 is a ‘front elevation, to the scale of FIGURE
Designed to be lodged ?rmly within the cavity is a
50 block 36 of resilient deformable material such as rubber
or a rubber-like substance. While the block as can be
vulcanized to the metal of the body 14», it is usually pre
ferred to make the block 36 slightly larger than the
cavity and then to deform the block slightly and force
dicated by the line 4-4 of FIGURE 2; and
it
into seated position in the cavity for frictional reten
55
FIGURE 5 is a plan of the keeper.
tion therein. The block 36 is formed ‘with rounded ends
The keeper according to the invention can readily be
37 and 33 designed to interlock vwith the curved surfaces
embodied in a number of different forms and has success
27 and 28, respectively. The block 36 is also formed
fully been incorporated as shown and described herein.
with a pair of inclined surfaces 39 and 41. The surface
In this instance the keeper is utilized with an excavator
tooth 6 including a tooth base 7 and a tooth tip 8. The 60 39 in part matches the surface 29. The surfaces 39 and
4-1 converge in a forward direction and extend through
base and tip are interengaged as described more fully in
the opening between the surfaces 31 and 32 to de?ne a
my above-identi?ed application. in such engagement the
rounded tip 42 which extends forwardly beyond the fore
tip 8 is so positioned as to align an upper'opening 9 and
a lower opening 11 with an aperture 12 formed in the
most portion of the surface 17 (see FIG. 5). Preferably
tooth base 7. The alignment of the openings ii and l1 65 all of the bounding surfaces of the block 36 except the
2, of the keeper;
FIGURE 4 is a cross section the plane of which is in
3,019,537
What is claimed is:
side surfaces 43 and 44 thereof are generated by a line
. In an excavator tooth having a tooth base member
moving always parallel to itself and parallel to the sur
and a replaceable tip member assembled thereon, and
face 16. The side surfaces 43 and 44 are parallel and
wherein said ‘members are provided with aligned open
are parallel also with the sides 21 and 2.2 of the body 14
ings to afford a passageway through the assembled mem
although the thickness of the block is somewhat less than
bers, a keeper removably reposed in said passageway to
that of the body.
hold the parts in assembled relation, said keeper having
In the forwardly extending portion of the tip 42 the
an elongated body essentially wedge shaped with end
block 36 is provided with a metallic, helical spring 4-6.
portions at one side thereof bearing against surfaces de
This is arranged so that its longitudinal axis <57 (FIG.
4) is parallel to the line generating the surface 26, for 10 ?ning the openings in said tip, said keeper having a re
cess formed inward at the other side of the body oppo
example, or so that the spring extends transversely of
site the side having the end portions aforesaid, a solid
the block 36. While the spring can be positioned in
block of resilient material seated in said recess and pro
various diiferent ways, it is greatly preferred to introduce
jecting in the direction of said other side of the keeper
the metallic spring as a loose part into the mold in which
the block 36 is formed.
After the spring has been de
posited, the rubber-like material is introduced into the
mold and vulcanization proceeds. The rubber-like mate
rial penetrates all of the interstices of the helical spring
and is vulcanized to the material of the spring itself.
The result is that the spring and the rubber-like material
are ?rmly locked and vulcanized together against any dis
lodgment by any ordinary means. In fact, it is believed
to be impossible to remove the spring from the block
without destroying either one or the other. When the
body, a helical spring embedded in said block of resilient
material so that the resilient material penetrates all inter
stices of the spring to ?rmly lock the spring to the re
ilient block with at most a thin ?lm of resilient ma
terial covering the convolute portions of the spring that
are outermost of the recess in said body, said coil spring
having its axis extending transverse to the longitudinal
axis of said keeper body, and the convolutes of said
spring projecting beyond the plane of said other side of
the keeper body bearing against a seating surface within
block with the spring imbedded therein is removed from 25 said tooth base.
2. In an excavator tooth having a tooth base member
the mold, the appearance of the spring is substantially as
and a replaceable tip member assembled thereon, and
shown in FIGURE 3 since either some of the metal of
the spring is exposed or with a very little abrasion be
comes exposed since either nC layer or a very thin layer
wherein said members are provided with aligned open~
ings to afford a passageway through the assembled mem
of rubber overlies the spring metal. The spring is ‘made 30 bers, a keeper removably reposed in said passageway to
hold the parts in assembled relation, said keeper having
just slightly shorter in length than the width of the block
an elongated body with a rearward planar surface and
36 so that the ends of the spring are protected and are
a forward planar surface so oriented that said planar sur
covered, it thus being unnecessary to provide any especial
?nish on the spring ends.
faces converge toward a narrow end of the keeper body,
When the wedge body vltd is positioned as previously
described with the block as and spring incorporated
therewith, the exposed surfaces 51 of the metallic spring
afford a good bearing against the adjacent surfaces
bounding the aperture 12. in the tooth base 7, the doubly
end portions of said keeper body on the rearward planar
surface thereof bearing against surfaces de?ning the rear
of the openings in said tip, one end portion of the for
ward planar surface of said keeper body bearing com
plementally on a surface bounding the front of one of
curved contour of the round spring wire making a par 40 said openings in the tip, said keeper having a recess de-v
ticularly light friction sliding engagement. The wedge
?ned by inclined surfaces formed inward from a re
when ?nally in position is arranged so that the spring
stricted opening at the forward planar surface of the
snaps into a depression 52 in the tooth base '7. In some
instances a depression is not provided but a somewhat
body, a solid block of resilient material seated com
plementally in said recess to be ?rmly locked therein
improved result is obtained by forming the depression 45 and having a narrow forward end projecting outward of
52 as shown in FIGURE 1.
Just prior to its engagement with the depression, the
spring 46 is displaced inwardly and thus displaces the
rubber-like material of the block 36, much of this dis
placement being laterally since the block is otherwise
rather generally con?ned. The displacement also takes
place throughout a rather substantially distributed volume
of the block since the spring has an intimate interengage
ment therewith by reason of its numerous convolutions.
The spring, ‘being deformable in an axial direction, can
said forward planar surface of the keeper body, a heli
cal spring embedded in the narrow end of said block of
resilient material so that the resilient material penetrates
all interstices of the spring to ?rmly lock the spring to
the resilient block with at most a thin ?lm of resilient
material covering the convolute portions of the spring
that are outermost of the narrow end of said resilient
block and the restricted opening in said body, said coil
spring having its axis extending transverse to the longitdi
nal axis of said keeper body, and the convolutes of said
yield with the lateral displacement of the rubber-like
material. Furthermore, the spring may distort the rub
ber-like material, cocking the axis more or less in order
spring projecting beyond the forward planar surface of
the keeper body bearing against a seating surface within
to take care of any misalignment between the depression
3. In an excavator tooth having a tooth base member
and the remaining bounding surfaces.
said tooth base.
Thus, despite 60 and a replaceable tip member assembled thereon, and
some variations in dimensions and relative positioning
of the parts, the wearing surface presented by the spring
eventually is ?rmly lodged in the depression 52 with the
rubber-like material of the block 36 suf?ciently distorted
wherein said members are provided with aligned open
ings to afford a passageway through the assembled mem
bore, a keeper removably reposed in said passageway to
hold the parts in assembled relation, said keeper having
as to exert a continual pressure upon the spring to hold 65 an elongated body essentially wedge shaped with end por
the wedge body 14 ?rmly in place.
When the parts are dislodged by a hammer blow from
tions at one side thereof bearing against surfaces de?n
ing the openings in said tip, said keeper having an under
below, the rubber-like body 36 is again distorted to per
cut
recess formed inward from a restricted opening at
mit the spring to rise out of the depression 52 and the
the other side of the body opposite the side having the
wedge to be removed.
70
end portions aforesaid, a solid block of resilient material
Pursuant to this invention there is consequently pro
con?gured complemental to and seated in said recess
vided a keeper having a wear-resistant tip so effectively
and having a narrow end projecting beyond said other
interengaged with a partially con?ned resilient rubber-like
side of the keeper body, and a helical spring embedded
insert as to afford a firm lock under all circumstances
75 in the narrow end of said block of resilient material so
and even after repeated use.
5
3,019,537
6
that the resilient material penetrates all interstices of the
spring to ?rmly lock the spring to the resilient block with
References (Zited in the ?le of this patent
UNITED STATES PATENTS
at most a thin ?lrn of resilient material covering the con
volute portions of the spring that are outermost of the
narrow end of said resilient block, said coil spring hav
ing its axis extending transverse to the longitudinal axis
of said keeper body, and the convolutes of said spring
projecting beyond the plane of said other side of the
keeper body bearing against a seating surface Within said
tooth base.
10
1,907,012
2,258,135
2,325,556
2,721,091
2,772,492
2,846,790
2,927,387
Smith ________________ .._ May 2, 1933
Curtis _______________ __ Oct. 7, 1941
Taylor et al. __________ __ July 27, 1943
Pfefferle et al. ________ _.. Oct. 18, 1955
Murtaugh ____________ __ Dec. 4, 1956
Davis et al. __________ __ Aug. 12, 1958
Drover ______________ __ Mar. 8, 1960
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