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Патент USA US2107895

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Feb. 8, 1938.
Filed June 15, 1936
' 3 Sheets-Sheet l
HANS Lurwsmom
A rroe/vs v
Feb. 8, 1938.
Filed June 15, 1936
3 Sheets-Sheet 2
Feb. 8, 1938.
Filed June 15., 1936
s sheets-sheet 5 ~
Lu nosrlaom
‘Patented Feb. 1938
‘_ 2,107,895
Hans Lundstrom, St. Louis, Mo., usignor of two
thlrds to‘ Ida. Lundstrom, and one-third to
'JosephMag/idsonahd Phelix B. Magidson, all ’ ,
, of _ St. Louis, Mo.
Application June 15, 1936, Serial No. 85,284
.7 ~
10 Claims.
(01. 214-138)
' .
invention relates broadly, to excavators, of vention appertains, from the disclosures herein
"thetype used by road builders,>building contrac
To this end, my invention consists in the novel
tors, and many others, andwell known, and has
construction, arrangement and combination of
~ among its objects the production of such excava
parts herein shown and described, and uses men- 5
tors that will be especially adaptable to and capa
ble of a maximum number of uses, which is easily
tioned, as will be more clearly pointed out in the
constructed and operated, speedy and simple in
claims hereunto appended.
f operation and construction, economical,‘ and
otherwise satisfactory and 'emcient for use where‘
ever deemed applicable.
The invention hasnamong' its objects, to ‘pro
I duce an excavator having a dipper and a carry
ing'v boom- therefor, the boombein'g telescopic in
constructionand action, and the dipper being op
15: erably connected. to both the ?xed and movable
parts of said telescopic boom, in such a way that
‘said dipper will have amaximumv digging radius,
enablebetter'and easier dumping, and permit of
very close jack-'kniiing of the dipper against said
I The invention hasanother object, to provide a
dipper 'so mounted to said telescopic boom-that
, when‘ the excavatoris not in use, it will provide
greater stability and minimize any overturning ,
25' tendencyof the excavator, while .at' the same time
permitting the mechanism tobe of minimum height
‘to'permit of digging in places of low overhead
clearance and to more easily transport the en
.‘A further object of my invention is to provide
' means for easily and readily mounting and re
’ mounting the dipper from the boom, to permit the
dipperjto be reversed so as to dig in either forward
or. backward direction, ‘as required, and thereby
35, provide for maximum-useof said device.
x-Anvadded object of‘ the invention is to provide
tarnovel latch for the dippen-whereby the latter
I may be securely held-in latched position against
accidental dumping ‘and yet may be readily,
easily and conveniently dumpedwhen required. '
A still further objectof the'invention is to pro
, -
Inthedrawings, wherein like reference'charac
,ters indicate like or corresponding parts through
out the drawings,
Figure 1 is'a side elevation of my improved ex
cavator, as used for forward digging;
‘ Figure 2 is a similar view of the same, but show
ing .the: dipper reversed, as usedfor back digging;
. Figure 3 is a top plan view of the mechanism 15
Figure 4 is a longitudinal cross-sectional detail
of the dipper;
Figure 5 is a transverse cross-sectional detail of
the boomv parts, taken substantially on, the line 30
8-5 of Fig. 3; and
Figure 6 is atop plan view of the device shown
m Fig,
. .
Referring more ,particularly to the drawings,
wherein I have illustrated a preferred embodiment 25
of my invention, only a fragment of the cab, ma
chinery deck or machine A is indicated, the same
being of any desired or suitable construction, and
generally portable, as by means of the endless
conveyor I, so that it may be moved from place-to 30
place as required. ‘The deck is also generally com
pletely rotatable so that a maximum of digging
range may be had from each setting of the ma
chine. ! indicates the gantry or other forward
part of the deck, and to which the pulleys, sheaves,
or other operating line carriers may be mounted. '
Instead of having a boom of fixed length on the
forward end of the machine, and to which is fixed
a vertically ,movable dipper stick carrying a
bucket, dipper or other digging element at its low- ‘0
er end, I have provided an entirely novel and
‘vide‘means automatically operated during the functionally diii'erentstructure, as will now be de_—. I
usual dumping and closing of the dipper, to clean
The boom member that I employ is of telescopic
"and scrape the interior of the'latter, thereby obvi
construction, composed of a pair of longitudinally
ating the necessity of frequent manual cleaning, extensible and contractile elements relatively of
and vhence’ increasing the effective’v carrying load
of‘each digging stroke of the dipper. 1
‘Another added object of my invention is to
one another, the relatively stationary element 3
being pivoted or' otherwise hinged at one end to
, the forward end of said machine, so as to be mov
provide a'novel hoisting and digging ‘connection able in an up and down direction, and having its
£50 between,
the dipper, boom and machine, that the other end'preferably upwardly projected as at 4.
operation'jwill be sturdy, even and e?ective.
; Many other objects and advantages of the. con,
struction-herein shown and described will be ob
This element 3 is adapted to slidably receive the
relatively movable boom element 5, and may be.
of channel-shape in transverse cross-section,
vvious to those skilled in the art to, whichthis in
shown in ‘Fig. 5., to provide said guideways.
' '
The relatively movable boom element 5 has its
forward end projected forwardly and downwardly
as at 6, said end being forwardly beyond the ad
jacent end of the stationary boom element at all
the digging radius of the excavations over and
beyond that normally obtainable in digging op
When it is desired to retrieve-the dipper, after
dumping in a manner to be hereinafter de
The digging element, such as the dipper B, is
carried at the forward ends of said .boom ele
scribed, a pull line P having its rear end leading
into the machine and its forward end connect
ments, and is detachably reversible so that it may
ed to any suitable part‘ of th‘eldipper so as to
be used for digging either forwardly or backward
bring the latter up close against the under side
ly, relatively of said machine, Fig. 2 illustrating I of the boom to start the dig, is pulled, as re 10
use as a back-digger, while the other views show quired, this retrieving of the dipper also acting
its use as a forward digger.
. v
This dipper may be of any suitable size and
shape, as for example, composed of a pair of
15 opposed side walls 1-‘! extending substantially
vertically, a rear wall or back 8, and an end
the ?xed side walls 1-1, so as to open the dipper
for dumping and re-closing it thereafter, the
movable manner, as will be more clearly herein- ‘
control means for said movable walls not only
after set forth.- Teeth 30 maybe ?xed to the
" _
Said dipper is movably connected. to both of
the boom elements, there being a pivot pin In
between the opposed sides '|--‘| of the dipper,
for pivotal engagement through the forward ends
25 of a pair of links ll‘—l i, each of said links being
pivoted at its rear end to said upwardly extend
ing projection; 1-4 of the stationary boom element, the axis of said pin it being substantially in
the transverse median plane through said dipper.
A pair of pin-receiving apertures 12 and I3
are provided through the side walls of said dipper
to either side of and substantially like distances
below the apertures for receiving said pin in, the
- apertures l2 and I! being closely adjacent the
35 bounding edges of the front and rear of said dip
per, so that either the set of apertures I! or l3
causing said opening and closing movements, but
in addition making the dipper ‘self-cleaning. 20
This self-cleaning feature is especially important,
not only in making for easier and more e?lclent
operation of the dipper itself, but by, increasing
the effective load-carrying, capacity of the dip
The dipper is cleaned at, each‘ dumping 25
operation, thereby obviating the necessity of
manual cleaning of the same.
The end wall 9 is pivoted at its forward edge
to said pair of sidewalls ‘|-'|,~and' the rear wall
is provided with a pair of inturned ?anges 30
38, 38 of a height increasing from a. point ad
jacent its lower end toone' adjacent its upper
end, said ?anges being cioselyadjacent and sub
stantially parallelv to the inside surfaces of said
side walls. Said rear wall is pivoted intermediate
its top and bottom to said pair of side walls. as
may be used selectively, for mounting the dipper
at I9, and a pair of link plates v204-20 voperably
for forward or backward digging, as desired.
link said end and rear. walls together,: each of
Assuming that it is desired to mount the dipper
‘ for forward digging, as‘ shown in all the draw-~
ings, but Fig. 2, then said dipper‘is pivoted at III
to the forward end of said links ll-ll, and a
pin it pivotally interconnects the-downturned
projections of the movable boom with said dipper
45 through the pin openings I2. Obviously, in order
that the dipper may be conveniently, easily and
practically reversed from time to time, for either
backward or forward digging. said'pins are pref
erably removably o‘r detachably inserted into
The dipper preferably has its end and rear
walls movable relatively of one another and. of 15
wall 9, the rear and end walls cooperating in a
20 dipper at its open side, if desired.
to re-latch the dipper as will be more clearly
hereinafter set forth.
For operating the movable part of the boom
in its necessary direction‘ to enable the dipper
to ?ll in‘ digging,‘ I provide a control 3 :e L,
one end of which is dead-ended at I! to an
said link‘ plates being‘ interposed betweensaid
side walls and inturned ?anges, and being pivot
ally connected at one end to one of said‘ ?anges,
as at 39 and at its other end to‘said end wall of
the dipper, as at 40. Consequentlmlthe opening
and closing of the dipper will cause ‘the link
plates to substantially scrape the side walls. and 45
cause the inturned ?anges to substantially
scrape'said links.
The latch means has a ?nger 2| pivoted to the
lower end of the rear of the dipper and-movable
up against the under side of the-rear edge of 50
said end wall of the dipper, to hold said end and
rear walls in closed position when said ?nger is
thus retained in place. A bell-crank 221s pivot
‘ ed to the upper‘end of said. movable rear wall 8,
axle l6 removably connected to the upper ends
a link 23 interconnecting said bell-crank with 55
said ?nger 2|‘ to actuate the two in unison, a
pair of sheaves I‘I-I'l, said line their being spring 24. normally pressing said link in- the
threaded through said sheaves and gantry and direction to release or unlatch said ?nger.
around a loose pulley I8 adjacent the rear end of
An offset 25 is ?xed to the upper end of the‘ 60 said movable boom‘ element, the other end of rear .wall of the dipper and recessed to receive
said line leading into the machine, so that opera
said movable bell crank 22, said oifset 25 bear.
tion of this last-mentioned line end at the ma . ing against a stop 26 carriedv by a stationary
chine will actuate the movable boom element part of the dipper, near the top of the'latter, said
forwardly, while at the same time actuating the stop being spring-pressed to normally abut the
dipper'in its digging, it being especially noted said o?'setwhen the dipper is closed, but being 65
that when the dipper is at its rearmost posi
liftaHe to permit said offset to pass‘said stop
tion, as shown in dotted lines in Fig. 1, said links when desired. Cam means 21 is also carried by
are substantially-parallel with the‘ down-turned said part of the dipper and controlled‘by a‘ trip
and forwardly projecting ‘ends 6-6 of the ?xed line 28v leading to the machine. so that actuation
of the side walls of the dipper and carrying a
‘boom element, thus permitting the dipper to be
brought up very close under the boom, or closely
of said trip means through the line lllmoves said 70
cam to lift said stop and 98.11111‘? the load in the
' jack-knife, so that it is possible to commence the
dipper to move the rear and'end walls to open
digging cut from substantially that point as its
rearmost point, and continue said cut forward
75 ly for a considerable distance, hence increasing
position, the onset and bell crank passing said
stop to permit" this action.
‘ '
After dumping, a pull on the line P will ?rst‘
actuate the open walls to closed position and re
set the latch, and continued pull will retrieve
thedipper to next digging position. In order to
accomplish this result, the forward end of the
line P may be loosely threaded through an eye
‘I secured to the movable wall 8 a‘ short dis
tance above the pivotal axis i8, before being se
cured to said pivotal axis.
Hence, after the
be brought up very close under the boom, said
dipper beingiconnected directly to the boom and
not through the usual intermediary of a dipper
Having thus described my invention, it is obvi
ous immaterial modi?cations may be made in the
same without departing from the spirit of my in~
vention; hence I do'not wish to be understood as
dipper has been tripped, and the rear wall is in
10 the position shown in dotted lines in Fig. 4, a
pull on the rope P will pull the rear wall at ‘the
eye-bolt, tending to turn the rear wall about
limiting myself to the exact form, arrangement,
construction and combination of parts herein
said'pivotal axis i9, ‘and closing the dipper;
Thus, it is seen that by actuating they control
15 line L will telescopically extend the overall length
invention appertains and the claims hereunto ap
of the boom, while at the same time pivoting the
‘dipper ‘about both ofv its pivotal connections to
the boom elements, until the end of the cutting or
digging stroke, whereupon the dipper may then
20 be directed in proper position for dumping its
shown and described, or the uses claimed, except
as limited by the state of the art to which this
'What I "claim as new and desire to secure‘by 15
Letters Patent is:
1. In an excavating machine, a pair of rela
tively movable boom members, a reversible dipper,
.a link having one end pivoted to the end of ‘one
of said boom members and the other end pivoted 20
detachably to said dipper, and means for‘pivotal
1y connecting the adjacent end of the other boom
member selectively to said dipper at a pair of
spaced points beneath the pivoting point of the
charge of load. The retrieving line P is now . dipper and link, whereby said dipper may be re 25
pulled, the initial pull re-latching the dipper, and versed to dig either forwardly or backwardly.
2. In ‘an excavating machine, a pair of rela-'
' further pull swinging the dipper back to its origi
tively movable boom members, a dipper, a link
nal position for the next dig?forwardly.
For many‘digging operati‘iit'ns it is desirable that (having one end pivoted to the end of said mova
ao' the dipper be actuated toward the machine or ’ble boom member, detachable means for pivotally 30
backwardly to ?ll, and in my device it~is quite easy connecting said dipper to the other end of said
link, means for selectively pivotally connecting
I to change the dipper so that it may dig‘ either for
wardly or backwardly, this change being effected the adjacent end of the other boom member to
said dipper at either of a pair of spaced points
simply through the removal of several pivotal con
nections holding the dipper in place, and then beneath said pivotal point of the dipper and link,
replacing said pivotal connections in a manner whereby said dipper may be reversed to dig either
load, saidv dumping being rapidly accomplished
by a pull on the trip line 28 to release the dipper
latch, whereupon the load itself will spread the
movable walls of the dipper to permit such dis
now to be explained further.
forwardly or backwardly, and operating means in
To assemble the dipper for back-digging, after
its use as a forward digger, the three pivotal con
nections III, M, and ii are temporarily removed,
vand the dipper then turned so that its teeth ex
terconnecting said movable boom member and
' dipper to‘ actuate them in unison from said ma
3. In an excavating machine, a pairqpf rela
tively movable boom members,-a dipper, a link
pivoted at one end to the end of one of said boom
members and at the other end to said dipper, and
removed, and the other pin, I4, is placed through means for detachably pivotally interconnecting 45
the now adjacent pair of apertures i 3. In this po- 5 the end of the other of said boom members to said
dipper selectively at either of a pair of spaced
sition ofuthe dipper, the line" maybe slightly re
arranged so as to continue to be controlled from points beneath and substantially equidistant from
the pivotal point of said link and dipper and to
the machine as heretofore, as for example, by ex
tending forwardly and thence down over the pin either side of said point, whereby said dipper may 50
I0 for connection to the cam control of the latch, be used for digging either forwardly or backward
ly relatively of said machine.
somewhat as shown in Fig. 2.
4. In an excavating machine, a boom pivoted
The pull line P now leads to the open side of
the dipper and is freeof the latch means. In this for up and down movement, a dipper connected
, tend in the reverse direction, namely rearwardly,
after which‘ the pivotal connections II and ii are
replaced into their positions from which they were
vback-digging position of the dipper, the latch trip j to said boom and having an end wall and a rear 55
or release is through the line 28 as previously
mentioned, but the resetting of the latch may be
automatically accomplished, as by thethreading
of a line T about a loose pulley 29 mounted on the
forward end of the stationary boom element, one
wall movably interconnected to open and close
in unison, a latch maintaining said end and rear
walls closed, a latch stop carried by a ?xed part
of said dipper, and a cam operable from said
machine to move said stop from its normal look
on‘ the forward end of the movable boom element,
ing position with said latch to permit releasing
movement of said latch.
and the other end being dead-ended to the upper
portion of 'the rear wall of the dipper. Hence,
after the dipper has been dumped, and the dipper
5. In an excavating machine dipper, an end
wall and a rear wall movable in unison to open
or close, and link plates interconnecting said walls
and movable boom element are actuated back ‘to
and moving in a plane substantially parallel to
said side walls to wipe excess material from said
side walls of the dipper upon movement of said
' - end of said line being dead-ended adjacent to and
Wtheir initial digging position (and which in this
' , instance is of course farthermost from the ma
chine), the line T willbecome taut, its length be
ing such that it will just accommodate theopen
ing of said dipper, and bring said movable walls
to their closed position for the next dig.
Even in this position of the dipper for back
ward digging, there is an unusually large digging
75 radius, on account ofthe fact that the dipper may
movable walls. >
6. In an excavating dipper, ?xed side walls, an 70
endwall and a rear wall pivoted to said side walls
to move in unison to open or closed position, link
plates pivotally interconnecting said rear and
end walls and moving in a plane substantially 'ad- '
jacent and parallel to said side walls to scrape 75
4- I
2,107,896 '
excess material from said side walls of the dipper
upon movement of said end and rear walls rela
tively of said side walls.
7. In excavating machines, a dipper having
tom of the inside of said dipper to adjacent the
inside of the top of the same, and link plates at
either side of said ‘dipper beween said ?anges and
side wall and interconnecting said end wall and
?xed side walls and a movable end wall and rear rear wall so that said links wipe said side walls
wall, inturned?anges on said rear wall in a plane and said ?anges wipe said link plates during open
substantially parallel to said side walls, and link ' ing and closing movements of said dipper.
plates at either side of said dipper, interconnect
ing said'end and rear walls and movable in a
. 9. In an excavating machine, a boom, a dipper,
faces during opening and closing movement of
and means for pivotally connecting said boom to
either of a pair of spaced pivotal points selec
tively on said dipper, whereby the latter may be
removably reversed to dig either forwardly or
the dipper.
backwardly relatively of said boom.
'10 plane between said ?anges and side wall so that
said link plates and ?anges wipe adjacent sur
8. In an excavating machine dipper, ?xed side
15 walls, an end vwall and a rear wall movable rela
tively thereto to open or close said dipper, and
means for interconnecting said movable walls so
that said movement cleans them of excess mate
rial and comprising ?anges carried by said rear
20 wall in a plane adjacent and parallel to the side
walls and extending from substantially the bot
10; In an excavating machine, a boom, a bucket
having a plurality of pivotal points spaced trans 15
versely intermediate its front and rear, and means
for pivotally removably connecting said boom to
said bucket at one of said points for forward
digging and to the other of said points for reverse
digging- ,
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