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Патент USA US2136890

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NOV- 15, 1938.
‘
2,136,890
J. M. ROBERTS
EXCAVATING BUCKET’
Filed Dec. 13, 1957
2 Sheets-Sheet l
INVENTOR.
.Jn I ["LRub rts
BY
A TTORNEYS.
Nov. 15, 1938.
J. M. ROBERTS
2,136,890
‘EXCAVATING BUCKET
Filed Dec. 15, 1957
2 Sheets-Sheet 2
INVENTOR.
JD 21 M_. Roberts
v
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'
5””,
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'?; TORN S
2,136,890
Patented Nov. 15, 1938
PATENT OFFICE
2.186.890
.EXGAVATING BUCKET
Joel M. Roberts,‘ Racine, Wis.
Application December 13, 1937, Serial No. 179,493
4 Claims. (Cl. 37-1187);
This invention appertains. to excavating de
vices. andmnre particularly to grab. or clam shell
buckets;
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'
'
‘
‘.One of the nrimary‘qbjects, of my‘ invention is
to provide novel means. for constructing. and 0D.
elating a. grab, bucket, whereby the. usual com
plicated arrangement. of‘ heavy Operating cables
and sheaves and‘ awkward bucket head is elim
mated.
Another
salient object of my invention is to
provide a grab bucket having a novel arrange
ment of hydraulic operating means for opening
and closing the jaws of the bucket, whereby a
compact and durable structure will be had, which
ing side andend. ?anges ‘I and 8. The side
‘
?anges support the spaced parallel shafts 9 .and
ID on which are mounted, for swinging movement,
the bucket jaws II and I2. These jaws II and I2
can be constructed in any preferred manner and I‘
of any size tov suit the character of the work
being done.
The‘upper edges of the jaws H and I2’ have
secured thereto lift cables I3, and thesecables are
employed‘ for the sole purpose of raising and low v10
ering the bucket and do not constitute the op
erating‘means for the jaws at all. The bucket
also has formed or secured to the upper edges
of the jaws, upstanding pairs of arms I4, the
purpose of which will be hereinafter more fully 15
15 will be simple and easy to operate.
A further object of my invention is to provide a set forth.
The bottom wall 6 of the frame 5 has rigidly
grab bucket embodying a supporting frame or
platform on which is rockably mounted the secured to its central portion a bearing bracket
bucket jaws, the platform also supporting the I5, and this bearing bracket has rockably se
pump, operating motor, the hydraulic rams, the cured to its opposite ends, as at I6, the cylinders 20
rams being operatively connected to the jaws and ’ I‘! for the hydraulic rams I8. These cylinders
for the rams have reciprocally mounted therein
platform.
A still further object of my invention is to the usual ram pistons, and the piston rods I9
provide novel means for operating the bucket thereof extend exteriorly of‘ the cylinders and
25 jaws, which consists in a reversible electric motor are pivotally connected to the arms I4, as at 20. 25
A rotary or like pump 2| is secured to the plat
for operating a rotary pump in either direction,
whereby upon reversing of the motor, the ?uid form or frame 5 adjacent the cylnders, and the
under pressure can be forced to either end of the inner ends of the cylinders are connected by
ram cylinders for operating the ram pistons in means of conduits 22 with one port of the pump,
30 the desired direction for opening or closing the and the outer ends of the cylinders are con
nected by conduits 23 with the other port of the
Jaws.
pump. The pump is operated by a reversible
With these and other objects in view, the in
electric motor 24, and the cable for the motor ex
vention consists in the novel construction, ar
rangement, and formation of parts, as will be tends to the control cab of the excavating ma
35 hereinafter more speci?cally described, claimed, chine, and a switch is provided for reversing the 35
and illustrated in the accompanying drawings, motor, when necessary.
By reversing the electric motor, the pump 2|
in which drawings:
Figure l is an end elevation of my improved can be driven in opposite directions, and, hence,
grab bucket, showing the same in its closed in one instance the pump will intake fluid from
the outer ends of the cylinders and force the 40
40 position.
Figure 2 is a perspective view of the improved ?uid under pressure to the inner ends of the
cylinders. When the pump is rotating in the
grab bucket, showing the same in its open posi
opposite direction, ?uid is drawn from the inner
tion.
‘
ends of the cylinders and is forced under pres
Figure 3 is a top plan view of the bucket, show
sure into the outer ends of the cylinders.
45
45 ing the same in its closed position.
In operation of my improved grab bucket, the
Figure 4 is a detail sectional view taken sub
stantially on the line 4-4 of Figure 2, looking in same is lowered by the cables I3, and the motor
is operated for taking ?uid from the inner ends
the direction of the arrows.
Referring to the drawings in detail, wherein of the cylinders and forcing ?uid under pressure
intothe outer ends of the cylinders. Thus, the 50
50 similar reference characters designate corre
sponding parts throughout the several views, the pistons of the hydraulic rams will be moved in
letter B generally indicates my improved grab wardly, which will swing the jaws on their pivot
bucket, which includes a supporting frame 5. shafts III, and consequently the jaws will be
This frame 5 is in the nature of a platform, and opened. After the jaws engage the material to
be lifted, the electric motor is reversed, so as to 55
55 thus the same embodies a bottom wall 6, hav
2
2,136,890
drive the pump in the opposite direction, and
?uid under pressure will be pumped into the in
ner ends of the cylinders and will be drawn from
the outer ends of the cylinders. This will move
the pistons outwardly and forcibly swing the jaws
H and [2 on their pivots to a closed position.
From the foregoing description, it can be seen
that I have provided an exceptionally simple and
durable form of grab bucket, in which the jaws
10 can be expeditiously opened and closed by hy
draulic
rams. '
v
While I have shown, described, and claimed
the pistons connected with the jaws, and the
cylinders connected with the frame, it is to‘be
15 understood that this construction can be re
versed, and, in some instances, I contemplate
connecting the cylinders with the jaws, and the
pistons with the franie.
,
‘
Other changes-in details may be made with
20 out departing from the spirit or the scope'of my
invention, but what I claim as new is:
1. In an excavating bucket, a supporting
frame, jaws rockably mounted on the frame, lift
cables for the bucket, and hydraulic rams in
cluding cylinders and pistons, means pivotally
connecting the cylinders to the frame, and means
pivotally connecting the pistons to the jaws.
2. In an excavating bucket, a supporting
frame, a pair of bucket jaws having upstanding
30
ears on their inner ends, means pivotally con
necting the ears to the outer ends of the frame,
upstanding arms formed on the upper front
edges of the jaws, hydraulic rams including pis
tons and cylinders, means pivotally connecting
the cylinders to the frame, and means pivotally
connecting the pistons to the arms.
3. In an excavating bucket, a supporting
frame, jaws rockably mounted upon said frame,
hydraulic rams including cylinders and pistons,
means pivotally connecting the cylinders to the 10
frame, and means pivotally‘ connecting the pis
tons to the jaws, a liquid pump, conduits con
necting one of the ports of the pump with the in
ner ends of the cylinders, conduits connecting the
outer ends of the cylinders with the other port of 15
the pump, and means for driving the pump in
opposite directions.
4. In ‘an excavating bucket, a frame, jaws
rockably mounted 'upon the frame, hydraulic
rams for opening and closing the jaws including
cylinders and pistons, means pivotally connect
ing the cylinders to the frame, and means piv
ot-ally connecting the pistons to the jaws, a ro
tary pump, conduits connecting the inner ends
of the cylinders to one port of the pump, conduits 25
connecting the outer ends of the cylinders to the "
other port of the pump, and a reversible electric
motor for operating the rotary pump in either
direction.
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JOEL M. ROBERTS. '
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