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Патент USA US3022594

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Feb. 27, 1962
H. |_. MEYER ETAL
3,022,584
CRUMBING MECHANISM FOR EXCAVATING MACHINES
42
.
INVENTORS
‘Fla 5
HENRY
L. MEYER,
FRED 'R. WILHELM m
BY Y‘
Elmuun Gnecoaczix
?an‘, mm, 11%?“ k5,,
HTTORNEYS
Feb. 27, 1962 '
H, |__ MEYER ETAL
3,022,584
CRUMBING MECHANISM FOR EXCAVATING MACHINES
Filed Sept. 16, 1959
5 Sheets-Sheet 3
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INVENTORS
BY
HENRY
L. MEYER,
FRED
WI'LHELM H"
EDMUND Gazsoaczix
Tell! I Kilauea,
Y {-65:11
RTTOR NEYS
Feb. 27, 1962
3,022,584
H. L. MEYER ETAL
CRUMBING MECHANISM FOR EXCAVATING MACHINES
Filed Sept. 16, 1959
5 Sheets-Sheet 4
INVENTORS
“HENRY L. MEYER,
FRED R. WiLHELM m
BY
Emunn Gazeonczix
Feb. 27, 1962
H. L. MEYER ETAL
3,022,584
CRUMBING MECHANISM FOR EXCAVATING MACHINES
Filed Sept. 16, 1959
5 Sheets-Sheet 5
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~INVENTO/RS
HENRY L. MEYER,
BY
FRED R. WiLHELMQ-Q
EDMUND GREGORCZ‘K
Tana‘ Mum, gzmaaes‘l F130;
HTTwarm/s
United States Patent 0 ”
3,$ZZ,554
Patented Feb. 27, 1952
1
2
3,022,584
erally equally applied to the boom, and therefore elimi
nating the need for additional bracing. In addition, the
present invention provides an automatic locking device
CRUMBING MECHANISM FGR EXCAVATENG
MACHINES
_
Henry L. Meyer, Cleveland Heights, and Fred R: Wil
for holding the crumbing shoe in normal operating posi
tion, and upon actuation of the crumbing shoe toward
helm and Edmund Gregorczik, Willowiclt, Ohio, as
signors to The Cleveland Trencher Company, Cleve
land, Ohio, a corporation of Ghio
inactive or inoperative position, the locking mechanism
is automatically deactivated. The present invention in
Filed Sept. 16, 1959, Ser. No. 840,331
16 Claims. (Cl. 37—80)
crumbing shoe which may be readily extended in length
and/or adjusted positionally with respect to the digging
unit, thereby providing a crumbing shoe kit which is
This invention relates in general to improvements in
trench excavating or ditching machines, and more par
ticularly to a trench excavating machine having an’ 1m
proved crumbing mechanism which may be selectively
one embodiment thereof also provides a multiple part
adapted for use on various sizes and models of excavat
ing machines, thus making the mechanism more econom
ically desirable and greatly increasing its useability,
Accordingly an object of the invention is to provide an
and expeditiously moved to and from active position.
15
excavating machine embodying an improved crumbing
Crumbing mechanisms for excavating machines are
mechanism.
known in the art and include a crumbing shoe attached
Another object of the invention is to provide an exca
to the outer end of the boom of the excavating machine.
vating machine embodying improved crumbing mecha
This shoe extends downwardly from the boom to the
nism actuated by a ?uid powered motor unit for rapidly
floor of the trench or excavation, and is so shaped as to .
shove or propel loose material on the floor of the trench
forwardly so that it may be picked up by the excavating
buckets of the machine and removed from the‘ trench,
thereby maintaining the ?oor of the trench comparative
ly clean. Such crumbing mechanism also helps in main
taining a constant grade trench bottom ‘by-stabilizing the
digging unit at its depth ofroperation. It is also known
in the art to swingably mount such crumbing shoe to the
outer end of the boom for pivotal movement in a gen
erally vertical plane, so that the crumbing shoe can be
selectively moved. into and'out of active position, thus
providing for raising the shoe clear of ‘the trench and
thereby increasing the positioning and maneuverability
characteristics of the machine. When it is necessary or
desirable to have the digging wheel of the excavating ma
chine dig straight downwardly, the crumbing shoe must
be swung upwardly and rearwardly to etfect its clearance
above the unexcavated ground. When the digging wheel
has reached full depth and has proceeded forwardly at
sufficient distance to provide room in the trench for the
crumbing shoe, the digging wheel is generally raised and
then the crumbing shoe is lowered and manually locked
in position, after which the digging proceeds.
Various mechanisms have been utilized in the past for
so pivoting and maintaining the crumbing shoe in and out
of operating position, with all such mechanisms generally
necessitating a considerable amount of manual operations
to effect the proper positioning of the crumbing shoe.
Some such mechanisms that have been used are cables
and cranks, geared winding drums for power activation
t’ the crumbing mechanism, and/ or levers or the like for
manual operation. None of the latter arrangements have
been found to be completely satisfactory and have been
found either to be undependable in operation, bulky and
unduly space consuming in nature and/or awkward and
time consuming in the accomplishment of the desired
function.
a
In the pending application of John W, Spring Serial
No. 755,010, ?led August 14, 1958, now Patent No.
2,908,091, there is disclosed a novel crumbing mecha
nism for excavating machines which is actuated by means
of a ?uid powered motor, thereby providing for the rapid
and selective positioning of the crumbing shoe by the
operator of the machine, and which is expeditiously con
and selectively positioning the crumbing shoe into and
out of active position, and including a locking device
which is operative to automatically lock the crumbing
shoe in operative position and to automatically deactivate
itself upon actuation of the mechanism for movement of
the crumbing shoe toward inactive position.
A further object of the invention is to provide an
excavating machine including generally horizontally ex
tending boom structure and embodying improved crumb
ing mechanism of the latter type, and wherein the crumb
ing mechanism may be positionally adjusted so as tooper
atively extend downwardly at various distances with re
spect to the boom structure and the associated excavating
unit, and including means for adjusting the position of the
locking device of the crumbing mechanism with respect
to the crumbing shoe.
-
A still further object of the invention is to porvide a
crumbing mechanism of the latter type wherein the crumb
ing shoe is of a multiple part construction, providing for
selective elongation of the shoe and/or positioning of
the shoe proper closer to or farther from the associated
excavating unit, thereby providing for the use of the
mechanism with a range of sizes of excavating units and
greatly increasing the useabiilty of the device.
Another object of the invention is to provide an im
proved crumbing mechanism which is comparatively un
complicated in nature and which may be readily added
to existing excavating machines or may be easily em
bodied in new machines, and which is adapted to be read
ily swingable into and out of active position, and which
Incorporates means for automatically locking the crumb
ing mechanism in operative position and for automatical
ly deactivating the locking means upon actuation of the
crumbing mechanism toward inoperative position.
Other features and advantages of the invention will
be apparent from a consideration of the following descrip
tion taken in conjunction with the accompanying draw
ings wherein:
FIG. 1 is a side elevation of an excavating machine
embodying the instant invention.
FIG. 2 is a fragmentary, enlarged, side elevational
view of the outer end of the boom and associated crumb
ing mechanism of FIG. 1, and illustrates in greater detail
the arrangement of the instant invention including the
locking means for automatically locking the crumbing
trolled from the operator’s work area on the machine,
thus greatly reducing the labor and time involved in such 65 shoe in operative position. In dot-dash lines, the fully
operations.
locked position of the mechanism is illustrated, and in
The present invention provides a ?uid powered crumb
full lines the position of the mechanism during initial
ing mechanism which embodies certain improvements
actuation to move the crumbing shoe toward inactive
over the aforementioned Spring arrangement, as for in
stance by eliminating all eccentric loading on the boom
position is shown.
of the trenching machine, whereby all stresses are gen
the‘ structure illustrated in FIG. 2.
,
FIG. 3 is a fragmentary, enlarged, top plan view of
3,022,584 ‘
.
'
4
3
FIG. 4 is a fragmentary, enlarged, end ‘elevational
separable fastener element therethrough, and thus ad
justably maintain portion 58 in predetermined position.
view taken generally from the right hand side of FIG. 2.
FIG. 5 is an enlarged, top plan view of the latching
I o‘r'elocking device per se, utilized, in the FIGSJI to 4
'
assembly;
'
The upper end of shoe 42 includes spaced and generally
upwardly tapered side plate portions 64 which, as afore
mentioned, provide for the pivotal mounting of the shoe
'
FIG. 6 is an enlarged, fragmentary, side elevational
as at 44 to the outer end of the boom.
» view of a crumbing mechanism embodying the aforemen
‘ tioned automatic locking device, and illustrating a modi
Side plate por
tions 64 are received intermediate transversely spaced sup
porting plate elements 68 which are secured to the outer
; ?ed multi-part crumbing shoe for use in selectively ad
end of the boom, and which include a plurality of trans
?"justing the crumbing shoe proper longitudinally with re
spect to the excavating unit, thereby permitting the use
of the mechanism with various sizes of excavating units
versely aligned vertically spaced openings 70 therein for
changing the pivot point of the crumbing shoe with re
spect to the boom. It will be seen that the axis of rota
and/or under var ous operating conditions.
tion of the crumbing shoe may be readily’ changed by
FIG. 7 is an end elevational view taken from the right
‘mounting the pivot pin or shaft 44 in any selected trans
hand side of FIG. 6.
15 versely al gned pair of the vertically spaced openings 70
FIG. 8 is an' enlarged, fragmentary, side’ elevational
in supporting plate elements 68. The bottom‘ edge 74 of
each of the plates 68 is tapered downwardly in a forward
‘ 6,'but illustrating a further modi?cation includ ng side
direction, and the inner ends of plates 68 ‘are provided
' plate extensions for the shoe proper, for also providing
with a plurality of vertically spaced and transversely
for extension of the crumbing shoe proper.
20 aligned openings 76 therein as shown. Opposing pairs of
FIG. 9 'is an end'elevational viewtaken from the right - openings 76 in plates 68 are adapted for rece ving a trans
l hand side of 1316.8.
verse anchor shank or bolt 78 (FIG. 2) therein, for a pur
view of a crumbing mechanism generally similar to FIG.
, Referring again to the drawings, and espec'ally to FIG.
pose to be hereinafter described.
1 thereof, there is shown a trenching machine of the well
The articulated rotation multiplying i linkage 46 com
‘' known wheel type, embodying the instant invention. Such 25 prises a pair of transversely spaced, generally inverted
; an excavating or trenching machine broadly comprises a
V-shaped crank "elements 80, connected .by cross- mem
> main frame 10, supported on suitable tractor treads 12,
j_ a main power, plant or internal combust'on engine 14
supported on the forward end of frame 10, mast struc
- ture 16 for supporting a ‘vertically movable boom struc
_ ture 18, an excavating wheel or unit 20 rotatably mount
_ 'ed on boom 18 by means of frame and wheel arrange
. ment 22 and 22a and drivingly connected to the motor
innit 14 of the machine by the chain and sprocket ar
~ hers 80a, and rotatably connected as aforementioned at
e 48 as by means of a transverse shaft element, to the out
. er end of the boom, and at their other ends are rotata
30 bly connected as by means, of aforementioned detach—
able shaft or bolt element 54 to transversely, spaced lifter
lnk elements 86. Lifter‘ link elements 86 are connected
by cross member 86a and are in turn journaled at their
' inner ends, and as by means of transverse pin 50, to the
. rangement generally referred to by reference number 24, 35
' ‘1 and a transversely extending discharge conveyor 26'which
; is adapted to receive material, from digg'ng unit 20 and '
_ , carry it to either side of the machine. Boom structure
'
18 is pivotally mounted as at'28 'for movement in a
'- generally vertical plane, and may be raised and lowered 40
. on mast'structure 16 by means of cable and pulley sys
~,tems 30 actuated by winding drums 32 and 34 mounted
Y on the machine chassis and in a’ manner well known in
' the art. It will be understood of course, that other struc
tural arrangements and systems could be utilized for con
trolling the movement of boom 18 and associated digging
unit 20 without departing from the scope of'the invention.
_
The controls for operating the various components of
,the machine, including the aforementioned main power
plant 14, the winding drums ,32 and 34, the digging unit
_ 20,'etc. may include the levers 36, 37, 38, and 39, as
shown, with the latter being localized in a particular area
»on the machine for convenient access by the machine
. operator and from one general location.
upper side plate portions 64 of thecrumbing shoe.
The ?uid powered motor unit 52 has the outer end of
its cylinder'element pivotally connected to the pivotal
joint 54 of the rotation multiplying linkage 46 wh Ie the
end of the piston rod element of the motor unit is piv
otally mounted as at 56 on the transverse pivotal joint
44 of the crumbing shoe to the boom. It will be seen
that the linkage 46 and actuating motor unit 52 are
' centrallyarranged at the outer end of the boom, thereby
‘ eliminat'ng all transverse eccentric loading on the boom,
to insure equal application of stresses thereto.
The pivotal connection of each of the lifter link ele
’ ments 86 tothe respective upper side plate portion 64
' of the crumbing shoe includes'an elongatedrslot 90 (FIG.
' 2) in each of the side plates in which aforementioned
pin element 50 is adapted to move lengthwise of the
-'slots, as will be hereinafter'described in greater detail.
' In the embodiment of the invention illustrated, washers
92 and cotter pin elements 92a (FIG. 4) prevent pin 58
from inadvertent movement out of journaled position in
The crumbing mechanism of the instant invention is 55 slots 90.‘
'
.
In
accordance
with
the
invention,
an ‘automatic lock
‘comprises an elongated generally arcuate shaped in side
ing mechanism is provi-led comprising a latch member
elevation box-like structure 42, known as a crumbing
94 (FIG. 5) pivotally mounted on transverse shaft 95
, shoe, and pivotally mounted as by means of removable
f (FIGS. 2 and 4) which in turn has its terminal ends sup
, bolt or, shaft element 44 to the outer end of boom 18.
ported in elongated slots 96 in each of the upper side
A rotation multiplying, articulated linkage 46 is pivotally 60. plate
port'ons 64 of the crumbing ‘shoe. The latch mem
v generally indicated by reference number 40, and as shown,
connected to the boom as at 48, and to the crumbfng shoe,
2 as at 50, for swinging the crumbing shoe about its pivot
jal connection‘ 44‘to the boom and thus move the crumb
ing shoe into and'out of operative position. A reciprocal
type, double-acting, ?nid powered motor unit 52 is pivot
.ally connected at one end, as at 54, to the articulated
f jo'nt of the linkage structure 46, and at the other end
~ 'ber comprises a pair of transversely spaced arm elements
' 98 (FIG. 5) rigidly interconnected by girder or rib ele
, ment 98a.
The inner end of'each of arm elements 98
comprises an upwardly facing U shaped,.in side eleva
tion, slot or recess 99 which is adapted to receive the
‘ aforementioned transversely extending anchor bolt ele
ment 78 extend'ng through openings 76 in the support
j thereof is pivotally connected as at '56 to the outer end of
_ the boom for actuating the linkage 46.
ing plate elements 68, in the locked position of the latch
_ The crumbing shoe 42 has a rearwardly extending 70, ing device, to positively lock the crumbing shoe in oper
‘)ground engaging portion 58 (FIG. 1) pivotally mounted
ative position. The other 'or outer'end, of each of‘ arm
“at one end, as at 60, to the lower end of the shoe proper,
-elements 98 comprises an elongated generally lengthwise
:and adjustably connected at its other end, to the shoe, as
by adjustable strap structure 62.< ~Strap structure 62 may
include vertically spaced’ openings 62a for receiving a.
extending opening'100 therein. Open'ngs 1G0 receive
therethrough ‘transverse ‘pin 50 which pivotally connects
linkage 46 to the crumbing shoe. Each arm 98 also has
3,022,584
6
above a plane perpendicular to the plane of the paper of
FIG. 2 and passing through the pivotal axis 48 of the
rocker arms 89 to the boom and the pivotal axis 44 of the
motor unit 52 to the boom, to ensure the upward pivotal
movement of the shoe from the operative position illus
trated to an inoperative upwardly swung position wherein
the crumbing shoe is disposed generally above the boom.
an opening 101 therethrough for receiving shaft 95 to
pivotally mount the latch on the crumbing shoe.
Shaft 95 has a threaded bolt element 14.32 extending
through each of its terminal ends, generally transverse to
the axis of the shaft, and disposed outwardly of upper side
plate portions 64 of the crumbing shoe. The shank por
tion of each of bolt elements 102 passes through an open
portion 64 and extending laterally therefrom. Threaded
In the latter inoperative position, the crumbing mechanism
is disposed out of interferring relation with respect to
inner end thereof with respect to the anchor shaft or bolt
. then additional clockwise movement, as viewed in FIG. 2,
ing in a bracket 184 secured to the respective side plate
nut element 1G5 (PEG. 2) maintains the associated bolt 10 the end of the boom and associated excavating unit 29 to
facilitate the maneuverability of the trenching machine.
102 in secured relation with shaft 95, and threaded nut
Upon supplying working ?uid via feed line 114 to the
elements 1:137 provided for adjustment of the axis of rota
opposite end of the cylinder of motor unit 52, the piston
tion of the latching device 94 longitudinally with respect
rod is retracted and the crumbing shoe is quickly caused
to the side plate portions 64. It will be seen that move
ment of nut elements 137 along bolt 1(52 will move the 15 to pivot downwardly toward its operative position. Dur
ing lowering of the crumbing shoe, the weight of‘the shoe
shaft 95 in the associated elongated slot 96, and thus ad
causes the pine 50 to be maintained in the upper ends of
just the position of the pivotal axis of the latching device
slots 90 in side plates 64 and thus maintains the latch
94. The purpose of the latter is to provide an arrange
in its inactive or openv position until abutment surfaces
ment for readily adjusting the position of the latch mem
her, and especially the position of the recesses 99 in the 20 116 on the latch arms 93 engage the anchor shaft 78, and
element 78, if the axis of rotation of the crumbing shoe
is lowered with respect to the boom and from the posi
tion illustrated in FIG. 2 of the drawings. By moving
pin 44 to a lower set of the transversely spaced openings 25
70 in supporting plate portions 64, the pivotal axis of
the crumbing shoe will be lowered, and the outer ends of
lifter links 85 of articulated linkage 46 are provided with
of the cylinder and associated downward movement of
links 86 forces pin 50 toward the bottom ends of slots
90 in side plates 64 and thus pivots the latch into locking
coaction with the anchor bar 78' to automatically lock the
crumbing shoe in operative position. In the operative
locked position of the crumbing shoe, the latch 94 is held
,_ in engagement by the hydraulic pressure in the motor unit
52 and by the combined weight of the motor unit 52 and
a plurality of openings 168 for correspondingly adjusting
the pivotal connection of levers 8i} and links 86. Since 30 associated linkage 46, thereby obviating any possibility
of unlatching by accidental slipping, and yet Without my
the latching mechanism 94 is moved downwardly with
the crumbing shoe upon downward movement of the axis
of rotation of the latter, each of supporting plate portions
material application of stress to the motor unit.
The motor unit 52 and associated feed lines 112, 114
may be connected to a conventional hand-operated con
68 is provided with a separate extensible section 109
which may be extended downwardly and be secured in 35 trol valve, as for instance diagrammatically illustrated
valve mechanism 118 (FIG. 1) and to a source of supply
such extended position as by means of fasteners 110, such
of working ?uid, as for instance a pump and ?uid reser
extended sections mounting the anchor shaft 78 at their
voir mounted on the excavating machine frame and op
lower ends. Thus the anchor shaft 78 may be lowered
eratively connected to the main power unit 14 of the
to a position corresponding to the changed position of the
axis of rotation of the crumbing shoe, for locking coac 40 machine in a manner well known to those skilled in the
art. The operating valve 118 for the hydraulic system
tion with the latching arms 93, and the axis of rotation of
controlling motor unit 52 is preferably located in the ma
the latch arms may be adjusted by means of the afore
chine operator’s work area in the vicinity of the afore
discussed adjusting bolt arrangement 162, to insure
mentioned control levers 36, 37, 38, 39, and as shown,
proper coaction between the recesses 99 in the inner ends
45 thereby permitting the machine operator to control the
of the latching arms and the anchor shaft 78.
movement of the crumbing shoe in an expeditious manner.
Operation of the mechanism will now be described. As
may be best seen from FIG. 2, latching arms 98 of latch
Referring now to FIGS. 6 and 7, there is shown a
modi?ed form of crumbing shoe proper embodying the
ing device 94 are in substantially horizontal position when
afoirediscussed ?uid powered actuating mechanism and
the crumbing shoe is in normal operating and locked con
dition, as shown in dot-dash lines. Upon supplying motor 50 latching mechanism, for controlling the crumbing shoe.
In this embodiment, the drag links 86’ of the articulated
unit 52 with pressured ?uid as by means of feed line 112,
shoe actuating linkage 46 are of a slig tly different con
struction as compared to drag links 86 of the ?rst de
scribed embodiment in that the lower ends of links 86'
with respect to its associated cylinder. This outward
movement of the piston rod initially merely lifts pin 50 to 55 are bifurcated as at 129 and connected by cross p’ece
122 and then individually pinned or iournaled, as by
the upper end of each of slots 90 in the upper side plate
which is connected to a suitable source of ?uid, the piston
rod 111 of motor unit 52 commences its outward stroke
means of laterally spaced pins 5G’, to the respective side
portions 64 of the crumbing shoe, and toward the outer
plate support portion 64’ of the crumbing shoe. Cross
end of each of openings 100 in arms 98 of the latch 94
pieces 122 are adapted for engagement with edge surface
and substantially to the position illustrated in full lines
in FIG. 2 of the drawings, and thus pivots the latch 60 124 of the respective side plate portion 64’ to limit upward
rotation of the shoe in the upwardly swung inoperative
member 94 about its pivotal connection 95 to the crumb
ing shoe, to automatically unlock the latching arms 98 of
position thereof.
the latch from holding coaction with anchor shaft 78.
Side plate portions 64’ are detachably connected to
It will be seen therefore that the initial outward move
the working section 42’ of the shoe proper, with the
ment of the piston rod of the motor unit merely unlocks 65 latter being provided with ear portions 126 for pivotally
the latching mechanism, and is not adapted to cause any
mounting the shoe, as at 128, to the side plate portions
upward pivotal movement of the crumbing shoe. Upon
6A.’. The shoe working section 42’ has a plurality of
further outward movement of the piston rod with respect
rearwardly extending threaded studs 130 secured to its
to its associated cylinder, the rocker arms 80 of the lifter
rear face, such studs extending through a bracket 13?.
linkage are caused to rotate further in a counterclockwise 70 extending transversely between the bottom ends of side
direction, as viewed in FIG. 2, about their pivotal con
plate portions 64’ and secured thereto by fastener as
nection 48 to the boom, and the crumbing shoe is caused
semblies 134. Threaded nuts 136 coacting on opposite
to pivot upwardly due to the pull on drag links 86. It
sides of transverse wall 138 of bracket 132 and with the
will be seen from FIG. 2 that the pivotal connection 54
respective threaded stud 130, adjustably maintain the
of the rocker arms 86 to the lifter links 86 is disposed 75
8,022,584
8
. shoe section 42' in non-pivotal relation with, side plate
portions 64'.
the excavating unit in a longitudinal direction, and
- a
wherein the locking mechanism is adjustable so that
it may be coordinated with the'adjustability of thecrumb
Side plate portions 64' are provided with' a plurality
, of longitudinally spaced openings 140 therein for adjust-:_
ing the pivotal axis 128 of the crumbing shoe section 42'
' ing shoe proper, to insure proper coaction between the
i operating parts of ‘the locking mechanism in the oper
closer or further away from the digging wheel or unit
. ative position of the crumbing shoe.
20, to thereby provide for the use of the crumbing mecha
The terms and expressions which have been em
’ nism with different sizes of digging wheel and under dill
' ployed are used as terms of description and not of
erent operating conditions, and vertically spaced open~
._'ings 70’ in adapter plates 142 secured to boom side‘
. plate extensions 63, provide for vertically adjusting the
pivotal axis of the crumbing shoe side plate portions 64’
limitation, and there is no intention in the use of such
terms and expressions of excluding any equivalents of
any of' the features described or shown, or portions
thereof, but that it is recognized that various modi?ca
Y to the boom, the same as in the ?rst described embodi
_ ment. As can be seen in FIG. 6, the aforementioned ex‘;
tions are possible within the’ scope of the invention
- claimed.
tension plates 109 supporting anchor shaft 78 are shown 15
in lowered position.
>
'
We claim:
.
1. In an excavating machine having a generally hori
, zontally extending boom, an excavating unit; mounted on
The aforementioned fastener assemblies 134 are pref
erably of the shear type so that if the crumbing shoe
7 said boom, crumbingmechanism including a crumbing
7 section 42' engages an obstruction, the fasteners134- will’
shoe pivotally mounted on said boom adjacent said unit,
shear off after application of predetermined stress, and
a ?uid powered motor unit operatively connected to said
» the shoe section 42' may then freely pivot about its a
boom and to said crumbing shoe for pivoting the latter
. pivotal axis 128 to the side plate portions 64', to prevent
. into and out of operative position and in a generally
damage to the crumbing mechanism.
Referring now to FIGS. 8 and 9, there is shown a;;
further modi?cation of the crumbing shoe proper, such 25
further modi?cation being generally similar to the FIGS.
6 and 7 embodiment except that the shoe has been po
> sitioned downwardly or in effect extended, by means of
vertical plane about its pivotal connection to'said boom,
and automatic locking meansincluding means movable
with respect to said shoe and other meansadapted for
locking coaction with said movable means, for main
taining said crumbing shoe in said operative position.
2. In an excavating machine having a rearwardly ex
elongated extension plate members 144‘ detachably se-j'.
tending elongated boom, an excavating unit mounted on
. cured to side plate portions 64'.
The shoe section 42’ 30 said boom, crumbing mechanism including a crumbing
is pivoted as at 128' to the side plate portions 64’ and
> shoe pivotally mounted on said boom adjacent said ex
7 associated extension plates 144, and is maintained in
rrcavating unit for swinging movement in a generally ver
, predetermined position by rearwardly extending stud
'tical plane into and outof operative position, a double
' elements 130 coacting with nuts 136 and bracket 132,1‘,
the latter being mounted on the lower ends of extension 35
_ plate members 144 and secured thereto as by the shear
_ type fastener assemblies 134. The extension plates 144
have longitudinally spaced openings 148 therein which
are adapted for alignment with the corresponding open:
ings 140 in the side plate portions 64’ for moving the
pivot axis 128' of the shoe section 42' longitudinally
of the boom and thus moving it closer or further away
from the digging unit.
ing shoe in operative position, said locking means includ
ing means pivotable with respect to said shoe and other
A spacer member 150 is also provided in this embodi-r ,
64', for further rigidifying the connection of the shoe sec- ‘
tion 42’ to the side plate portions 64'. Spacer mem
.ber_150 may be positioned longitudinally of the boom
together with the crumbing shoe section 42’, and the
means mounted on said boom, said pivotable means be
ing movable into locking coaction with said other means
upon predetermined actuation of said motor unit.
3. In' a crumbing mechanism for excavating machines
~ and the like, a generally horizontally extending support,
a crumbing shoe pivotally mounted on said support in
50 depending relation therefrom when in normal operating
position and adapted tovbe pivoted upwardly to an in
/ operative position, a ?uid powered motor unit attached to
' aforementioned web 156 diverges upwardly, as at 156a,
to provide for such forward positioning of the spacergf,
150 without interference with the web 156.
55
From the foregoing discussion and the accompanying
drawings it will be seen that the invention provides an
‘
improved power actuated crumbing mechanism which
may-be rapidly and selectively swung to and from oper-~
ative position and wherein the actuating means for the’ 60
crumbing mechanism is so supported and disposed on
I
the boom of the associated excavating machine that the
,
stresses placed upon the boom by the power actuation of
a
‘the crumbing shoe are equalized. The invention also,"
provides an automatic locking mechanism for the crumb
ing shoe which automatically locks the crumbing shoe
in normal operating position and which is automatically
unlocked upon actuation of the power mechanism to
pivot the shoe to inoperative position. In addition, the -
invention provides a crumbing mechanism of the latter
mentioned type which is adjustable and which is adjust
ably mounted on the boom of the excavating machine
so that it may extend downwardly at various distances
tively connected to said motor unit and to said crumb
ing shoe, said motor unit and said linkage means being
symmetrically'aligned with respect to the longitudinal
vertical center plane of said boom, means forvactuating
said motor unit, and automatic locking means operative
. upon actuation of said motor unit, for locking said crumb
ment, which is pivoted to the side plate portions 64' and
extension plates 144, as at 152, and which is disposed
intermediate the top wall 154 of the crumbing shoe and
a transverse web 156 secured to the side plate portions
acting ?uid powered motor unit mounted on said boom,
linkage means mounted on said boom and being opera
said support, lifter linkage means mounted on, said sup
port and operatively’connected to said motor unit and
to said'shoe, said motor unit coacting with said linkage
means to rotate said shoe about its pivotal connection
to said support to move said shoe to inactive position,
and automatic latching means on said shoe and on said
support for locking said shoe in normal operating posi~
tion upon actuation of saidmotor unit and movement
of said shoe to said last mentioned position, said latching
means including an arm pivotable with respect to said
shoe and an abutment mounted on said support, said arm
being movable into locking coaction with said abutment
upon predetermined actuation of said motor unit.
4. In a crumbing mechanism in accordance with claim
3 including means for automatically deactivating said
latching means upon actuation of said motor unit to
move said shoe to said inoperative position.
V70
5. In a crumbing mechanism for excavating machines
and the like and including a generallyhorizontally ex
tending elongated support, a generally elongated crumb
ing shoe pivotally mounted adjacent one end of said sup
port, a reciprocal ?uid powered motor unit pivotally at
7-» with respect to such boom structure and the associated:
' excavating unit and/or be disposed further or closer to 75 tached at one end to said support, lifter linkage means
3,022,534.
9
mounted on said support and operatively connected to
said motor unit and to said shoe for pivoting the latter
in a generally vertical plane from an operative position
wherein said shoe is disposed in generally depending rela
tion with respect to said support to an inoperative posi
tion wherein said shoe is disposed generally above said
_
10
gated support, a crumbing shoe pivotally mounted on
said support in depending relation therefrom when in
normal operating position and adapted to be pivoted up
wardly to an inoperative position, a ?uid powered motor
unit operatively connected to said support and to said
shoe for pivoting the latter into and out of operative
tending outwardly therefrom and a drag link pivotally
position, automatic locking means for maintaining said
shoe in said operative position including means for auto
matically deactivating said locking means upon actua
and mounted thereon and anchor means on said sup
working section detachably secured to said upper support
support, said linkage means including a rocker arm pivot
ally mounted adjacent one end of said support and ex
connected adjacent one end to the outer end of said 10 tion of said motor unit to move said shoe out of operative
position, and means for adjusting the position of said
rocker arm and pivotally connected at its other end to
shoe and said locking means in a vertical direction with
said shoe, said motor unit at its other end being opera
respect to said support.
tively connected to said linkage means, and automatic
11. In a crumbing mechanism in accordance with
locking means operable to maintain said crumbing shoe
in said operative position, said automatic locking means 15 claim 10 wherein said shoe comprises an upper support
section pivotally connected to said support and a lower
including an element movable with respect to said shoe
port adapted for holding coaction with said movable
section, and means on said last mentioned section for
means upon movement of said shoe to said operative
selectively adjusting the position of said working section
structure upon actuation of said motor unit to move said
on said upper section for selectively adjusting the se
cured position of said working section to said upper sec
tion in a direction lengthwise of the boom.
15. In a crumbing shoe device in accordance with
position, to lock said shoe in said last-mentioned position. 20 in a direction lengthwise of said support.
12. In a crumbing mechanism in accordance with
6. In a crumbing mechanism in accordance with claim
claim 11 wherein the connection of said lower working
5 wherein said movable means comprises a latching'arm
section of said shoe to said upper support section thereof
pivotally mounted on said shoe for movement in a gen
includes shear means adapted to fracture upon applica
erally vertical plane, means coupling said latching arm
to said link, said latching arm having an upwardly fac 25 tion of predetermined stress to said working section to
prevent distortion and damage to said crumbing mech
ing recess therein, and said anchor means comprising
anism.
’
a transversely extending shaft mounted on said support
13. in a crumbing mechanism in accordance with
and adapted to be received in holding relation in said
claim 11 including means for selectively lowering the
recess.
7. In a crumbing mechanism in accordance with claim 30 connection of said working section of said shoe to said
support section thereof to thereby elongate said shoe with
6 wherein the pivotal connection of said link to said shoe
respect to its pivotal connection to said support.
comprises a transversely extending element mounted on
14. In a crumbing shoe device adapted for mounting
said link and movably disposed in an elongated gener
on the excavating unit carrying boom of a trenching
ally lengthwise extending slot in said shoe, said latching
arm being pivotally connected to said drag link, where 35 machine comprising an upper support section adapted for
connection to the boom and a lower working section de
by said latching arm is automatically pivoted out of lock
tachably secured to said upper support section, and means
ing position with said anchor means on said support
shoe to inoperative position.
8. A locking mechanism for a crumbing shoe of an
excavating machine and the like wherein the 'crumbing
shoe is pivotally mounted on a generally horizontally
claim 14 wherein said working section is pivotally at
tached to said upper support section and including shear
means coacting between said upper section and said work
ative position wherein the shoe is in depending relation
to the support structure to an inoperative position where— 45 ing section to normally prevent pivotal movement of said
worknig section with respect to said upper section un
in the shoe is swung vertically upwardly from said opera
less said working section is subjected to a predetermined
tive position, said locking mechanism comprising an arm
stress limit at which time said shear means is adapted to
pivotally mounted on said crumbing shoe for movement
fracture to permit such pivotal movement to thereby pre
in a generally vertical plane, said arm having an open
slot in a marginal edge portion thereof, abutment means 50 vent distortion and damage to said crumbing shoe device.
extending support structure for movement from an oper
mounted on said support structure, said abutment means
being adapted to be received in said slot upon pivoting
of said arm when said shoe is in said operative position
to lock said crumbing shoe in said last mentioned posi
tion.
9. In a locking mechanism in accordance with claim
8 including a ?uid powered motor unit for pivoting said
shoe into and out of operative position and means oper
16. In a crumbing shoe device in accordance with
claim 14 including means attached to said upper section
and to said working section for selectively lowering the
connection of the working section to the support section
to thereby elongate said crumbing shoe device.
References Cited in the ?le of this patent
UNITED STATES PATENTS
’ 2,647,789
atively connecting said motor unit to said locking mech
anism for automatically moving said arm into and out of 60 2,649,792
Chayne ____________ __ Aug. 4, 1953
2,654,966
Miller ______________ __ Aug. 25, 1953
Askue ______________ __ Oct. 13, 1953
10. In a crumbing mechanism for excavating machines
2,776,853
Billstrom _____'_.____.___.. Jan. 8, 1957
and the like, a generally horizontally extending elon
2,908,091
Spring _________ _..--__ Oct. 13, 1959
locking position upon actuation of said motor unit.
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