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Патент USA US3059803

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Oct. 23, 1962
w. P. ATKINSON ETAL
3,059,793
EXCAVATOR DOOR LATCHING MEANS
Filed Nov. 27. 1959
5 Sheets-Sheet 1"
Fla!
-
=l
INVENTORS
WILLIAM F. A‘rxmsere
Bnurqo L.|,o~~ena~
BY
ATTOR EY
Oct. 23, 1962
w. P. ATKINSON ETALY
3,059,793
EXCAVATOR 000R LATCl-IING MEANS
Filed Nov. 27, 1959
’
s Sheets-Sheet 2
Fla'2
INVENTORS
WILLIAM F. ATKINSON
BRUNO L._.LoN~eneN
BY M M
ATT
NEY
Oct. 23, 1962
w. P. ATKINSON ETAL.
3,059,793
EXCAVATOR DOOR LATCHING MEANS
Filed Nov. 27. 1959
‘
3 Sheets-Sheet 3 (
INVENTORS
BY
WILLIAM F. ATKINSON
BRUNO L.Lo~~sa5~
ATTORNEY
‘United States Patent O?lice
3,®59,793
Patented Get. 23, 1962
ll.
2
3,059,793
second embodiment of the invention in which pivot 19
is carried directly by the dipper stick by means of a.
EXCAVATGR D’G'IBR LATCHING MEANS
William I‘. Atkinson and Bruno L. Lonngren, South Mil
supporting lug on the dipper stick 11, rather than being
waukee, Wis, assignors to Bueyrus-Erie Company,
carried indirectly by means of a lug on the dipper 1.2 as
South Milwaukee, Wis, a corporation of Delaware
Filed Nov. 27, I959, Ser. No. 855,799
5 Claims. (tCl. 2114-4146)
shown in FIGURE 1. So long as pivot 19 and binge pin
16 have relatively ?xed positions, the linkage will operate
satisfactorily.
The toggle levers 17 and 18 are pivotally connected to
This invention relates to the dipper door of an eX
each other at 21, to form the knee joint of the toggle link
cavating shovel and more particularly to the means for 10
age. The toggle linkage is arranged and constructed in
holding the door in a closed position.
such a manner that the center of the knee pivot 21 will
Conventional excavator dippers normally have a swing
move, as the door is swung to the fully closed position of
ing door hinged at the rear of the dipper and a latch ?xed
FIGURE 1, beyond a line drawn through the centers of
to the front of the door to hold the door in a closed posi
the outer pivots 19 and 20 of the linkage, and the toggle
tion. The latch usually comprises a bar or a bolt adapted 15 linkage will assume an over~center position. A suitable
to be received in a keeper plate secured to the front of the
stop such as 22 is operatively associated with the toggle
dipper. Since the front portion of the dipper encounters
most of the resistance to movement during digging opera
tion, a latch mechanism at the front of the dipper door
is subjected to maximum wear and damage. Conse
quently, a latch mechanism so constructed and located
must be frequently repaired or replaced. Such a latch
mechanism also offers additional resistance to the move
ment of the dipper during digging and represents a
parasitic drag in relation to the total force required to 25
raise the dipper during digging operations. In addition
to these disadvantages, the conventional latch bar and
keeper mechanism frequently become fouled with dirt or
other foreign material which prevents the latch from op
erating properly.
Accordingly, it is an object of this invention to provide
an excavator dipper having a door hinged at the rear
linkage so that the movement beyond center to the over~
center position may be adjustably limited. The weight
of the door will thereby maintain toggle lever 17 in con
tact with the stop 22, so that the toggle linkage will re
main in an over-center, locked position as shown in
FIGURE 1. Thus the door will be maintained in a
closed position without the need for a latch mechanism
normally provided at the front of the dipper door.
To open the door, suitable release means is provided
such as the cable indicated at 23 connected to a stabiliz
ing link 24 which is operably connected at 25 to toggle
lever 1'7. Movement of the release cable 23 and link
24 to the left, as shown in FIGURE 1, will cause move
As soon as the
knee 21 has moved beyond center to an over-center, un
30 ment of the toggle knee 21 to the right.
locked position, the weight of the door and the contents
thereof with door-restraining means adjacent the rear of
of the dipper will then swing the door about its hinge pivot
the door and thereby eliminate the conventional latch bar
16
to an open position, as indicated by the phantom lines.
and keeper at the front of the dipper.
35 As the door swings to the open position the pivot 20
A further object of the invention is to provide a dipper
of toggle lever 18 will be swung in an are about the door
door with a restraining means which does not require a
power-operated means to close the door and/ or maintain
it in a closed position.
In the drawings, FIGURE 1 is a side elevation view
of the outer portion of the dipper stick of an excavating
shovel having a dipper connected thereto and provided
with a dipper door and toggle linkage embodying the
invention.
FIGURE 2 is a bottom plan view of the dipper taken
on line 2—-2 of FIGURE 1.
FIGURE 3 is similar to FIGURE 1 and shows a second
embodiment of the invention.
Referring to the drawings, an outer portion of an eX
cavator dipper stick is shown at 11 having a shovel dipper
12 pivotally connected at 13. A pair of pitch brace links
14! are connected between the dipper stick and the dipper
to maintain their predetermined relative positions. A
dipper door 15 is hingedly connected to the rear portion
of the dipper by means of hinge pins 16 received in aligned
openings in the dipper and door.
hinge pin 16, thus moving the knee 21 to the position 21a
shown in phantom lines. Movement of the knee to this
position compresses a spring 26 which will later assist
in moving the linkage to an over-center, locked position
as the door is swung closed.
To close the door during operation of the excavator,
the operator by movement of the dipper stick ‘11 imparts
a swinging movement to the door relative to the dipper
so that upon a sudden stopping of the dipper the inertia
force of the door will move the door to a closed position.
To maintain the door in this closed position, the toggle
linkage of the present invention must be in an over-center,
locked position. To move the toggle linkage to such a
position, the velocity of the door swinging relative to the
dipper can be su?iciently high to impart an inertia force
to the toggle linkage capable of moving the toggle to an
over-center, locked position. To assist the inertia force
of the toggle linkage and to maintain the toggle in a locked
position a resilient means such as a spring 26 is operatively
connected between one of the levers of the linkage and
a suitable seat for the spring to serve ‘as a reaction point.
To maintain the door in a closed position, as shown
in solid lines in FIGURE 1, an over-center toggle link
The spring seat is carried by the dipper stick, either di
age is provided at the rear of the dipper door and con
rectly ‘or indirectly through the dipper. Since the knee 21
nected between the door and a pivot which is ?xed in 60 is moved to the right as the door is opened, causing
relation to the dipper. To provide a more balanced con
counterclockwise movement of toggle lever 17, the spring
struction, a pair of such toggle linkages may be used,
each being spaced equidistantly from the longitudinal
center line of the door as shown in FIGURE 2.
26 will be compressed. The degree of compression of
the spring can be selected by the locations of the toggle
lever pivots 19, 20 and 21 relative to the door hinge pivot.
The toggle linkage comprises a pair of toggle levers I7
and 18, the lever 17 being pivotally connected to the rear
of the dipper at 19 and the lever 18 being pivotally con
As the door is swung to a closed position, the energy
nected at 20 to the door at a point removed from the
center, locked condition, which will thereby maintain the
door in its closed position.
door pivot, hinge pin 16. Pivot 19 may be carried by the
dipper stick so long as the pivot is fixed in relation to
the dipper door hinge pin 16. FIGURE 3 discloses the
stored in the compressed spring will assist the inertia force
of the toggle linkage in moving the linkage to an over
At least one of the terminal pivots 19 and 20 of the
toggle linkage is preferably mounted in an adjustable fash
ion so that compensation may be made for minor varia
3,059,793
4
3
tions occurring during manufacture as well as wear of the
components of the linkage. As shown in FIGURE 1, the
pivot 20 is carried in a mounting bracket 27 which is piv
otally mounted on the door 15 by means of a pin 28.
The position of bracket 27 and the pivot 20 in relation
to the door can be determined by varying the number of
shims 29 placed between the bracket and a suitable mount~
ing pad on the door. A retaining means such as bolt 39
will then maintain the bracket 27 and the one terminal
pivot 20‘ in a predetermined, adjusted position.
of said knee off-center with relation to an imaginary line
passing through the centers of said toggle pivots and
when the door is closed said knee having a second posi
tion on the opposite side of said line and oft-center with
relation to said line; a stop carried on the dipper and
in contact with one of said links when said linkage is in
said second position; and resilient means carried on the
dipper and operatively associated with said linkage to
urge one of said links in a direction towards said stop.
4. In an excavator having a dipper stick, an open dip
10
Having now described and illustrated two forms of
the invention, it is to be understood that this invention
is not to be limited to the speci?c forms or arrangements
of parts herein described and shown.
What is claimed is:
per mounted on said stick, a hinge pivot on the dipper,
and a door mounted by means of said hinge pivot to
swing relative to said dipper and adapted to close the
bottom of said dipper, the combination of:
a ?rst toggle pivot on said door spaced from said hinge
1. In an excavator having a dipper stick, an open dip
per mounted on said stick a hinge pivot on the dipper, and
a door mounted by means of said hinge pivot to swing
relative to said dipper and adapted to close the bottom
a second toggle pivot carried by said dipper stick and
spaced from but ?xed in relation to said hinge pivot;
pivot;
a toggle linkage connected between said ?rst and sec~
‘ond toggle pivots and comprising a pair of toggle
of said dipper, the combination of: a ?rst toggle pivot
on said door spaced from said hinge pivot; a second toggle
pivot carried by said dipper stick and spaced from but
?xed in relation to said hinge pivot; a toggle linkage con
nected between said ?rst and second toggle pivots and
‘links pivotally connected to each other to form a
knee, said toggle linkage being arranged and propor
tioned in such manner that, when the dipper door is
in a closed position, the knee of said linkage is in a
comprising a pair of toggle links pivotally connected to 25
each other to form a knee, said toggle linkage being ar
ranged and proportioned in such a manner that, when the
dipper door is in a closed position, the knee of said link
of said ?rst and second toggle pivots, and said knee
age is in an over-center position with respect to a line
stop means for contacting one of said toggle links to
limit the movement of said knee after reaching over
center position, whereby the weight of said door will
pivots, and said knee being moved to pass over said center
line to an over-center position toward said dipper when
maintain said toggle linkage in an over-center posi
said dipper door is opened; and stop means operatively
ment of said knee after reaching said ?rst named over
respect to a center line drawn through the centers
being positioned toward said dipper when said dipper
is opened;
drawn through the centers of said ?rst and second toggle
associated with one of said toggle links to limit the move
?rst over-center position away from said dipper with
tion with said one of the toggle links in contact with
35
center position, whereby the weight of said door will main
tain said toggle linkage in an over-center position with
said stop; and a remotely controlled release means
carried by the dipper stick to move the toggle link
age in a direction away from said stop and said knee
is moved to pass over said center line to a second
said one of the toggle links in contact with said stop.
over-center position toward said dipper, whereby
2. In an excavator having a dipper stick, an open dip
40
the door is released to swing about said hinge pivot
per mounted on said stick, a hinge pivot on the dipper,
to an open position.
and a door mounted by means of said hinge pivot to swing
5. In an excavator having a dipper stick, an open dipper
relative to said dipper and adapted to close the bottom of
mounted on said stick, a hinge pivot on the dipper, and
said dipper, the combination of: a ?rst toggle pivot on
said door spaced from said hinge pivot; a second toggle 45 a door mounted by means of said hinge pivot to swing
relative to said dipper and adapted to close the bottom
pivot carried by said dipper stick and spaced from but
of said dipper, the combination of:
?xed in relation to said hinge pivot; a toggle linkage con
a ?rst toggle pivot on said door spaced from said hinge
nected between said ?rst and second toggle pivots' and
comprising a pair of toggle links pivotally connected to
each other to form a knee, said toggle linkage being ar
ranged and proportioned in such a manner that, when the
dipper door is in a closed position, the knee of said link
age is in an over-center position with respect to a line
drawn through the centers of said ?rst and second toggle
pivots; stop means operatively associated with one or" 55
said toggle links to limit the movement of said knee after
reaching said over-center position, whereby the Weight
of said door will maintain said toggle linkage in an over
center position with said one of the toggle links in contact
with said stop; and resilient means carried by the dipper 60
stick and operatively associated with one of said toggle
links to urge the knee of said toggle linkage to an over
center position in a direction towards said stop.
‘3. In an excavator having a dipper and a door pivotally
connected thereto and adapted to swing relative to said 65
dipper and to close the bottom thereof, the combination
of a pair of terminal pivots supported respectively on said
dipper and said door; a toggle linkage connected between
said pivots, said linkage comprising a pair of toggle levers
pivotally inter-connected to form a knee, said linkage in 70
operation when the door is open having a ?rst position
pivot;
a second toggle pivot carried by said dipper stick and
spaced from but ?xed in relation to said hinge pivot;
‘a toggle linkage connected between said ?rst and sec
ond toggle pivots and comprising a pair of toggle
linkage being arranged and proportioned in such
manner that, when the dipper door is in a closed posi
tion, the knee of said linkage is in an over-center
position away from said dipper with respect to a
line drawn through the centers of said ?rst and sec
ond toggle pivots, and said knee being movable to
ward said dipper when said dipper is opened;
stop means for contacting one of said toggle links to
limit the movement of said knee after reaching over
center position, and biasing means operatively asso
ciated with one of said toggle links to urge the knee
of said toggle linkage to an over-center position in
a direction towards said stop.
References @Cited in the ?le of this patent
UNITED STATES PATENTS
665,682
Hetlesaeter ____________ __ J an. 8, 1901
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