Material or article handling – Vertically swinging load support – Shovel or fork type
Reexamination Certificate
2001-05-15
2004-05-04
Underwood, Donald W. (Department: 3652)
Material or article handling
Vertically swinging load support
Shovel or fork type
Reexamination Certificate
active
06729831
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the construction of an extremely-small-swing working machine, constituting a working arm device by installing a working attachment on a boom-and-arm mounted on a swing table, enabling extremely-small swing in such a way that the boom-and-arm does not get out of the maximum-diameter swing circumference of the swing table in plan view when the boom-and-arm is folded to an upright state, and also enabling to offset the working attachment to left and right by turning the boom to left and right on the way thereof.
2. Background Art
Known as extremely-small-swing working machine constituted by installing a working attachment to a boom-and-arm mounted on a swing table disposed on a travelling machine is a swing excavator constituting a backhoe device by installing a bucket as working attachment, etc., for example. Moreover, also known to the public is a machine enabling to offset the attachment by turning the boom to left and right on the way thereof.
Explanation will be given, with reference to
FIG. 40
to
FIG. 49
, on a swing excavator comprising a backhoe as an example of conventional swinging machine. As shown in FIG.
40
and
FIG. 41
, at the top of a travelling device
81
is slewably mounted a swing table
84
, and at the top of the swing table
84
is provided an operator's cab
89
in which the operator's seat is covered by a cabin or a canopy, etc. The description regarding orientation and position hereafter will be given with reference to the orientation and position of the operator's cab
89
.
On one side of the operator's cab
89
is mounted a first boom section
90
in a way to turn freely from front bottom to rear top, at the tip of the first boom section
90
is mounted a second boom section
91
in a way to turn freely to left and right, on the second boom section
91
is mounted a third boom section
92
in a way to turn freely, on the third boom section
92
is mounted an arm
93
in a way to turn up and down in the longitudinal direction, and at the tip of the arm
93
is mounted a bucket
94
, which is a working attachment, in a way to turn up and down in the longitudinal direction, to constitute a backhoe device
85
, making it possible to move (offset) the arm
93
and the bucket
94
by turning the second boom section
91
to left and right, and execute excavation work of street drain, etc.
The first boom section
90
is turned from front bottom to rear top by telescopic motion of a boom cylinder
97
, the arm
93
is turned up and down by telescopic motion of an arm cylinder
98
interposed between the arm
93
and the third boom section
92
, and the bucket
94
is turned up and down by telescopic motion of a bucket cylinder
99
interposed between the arm
93
and the bucket
94
.
Moreover, the second boom section
91
is turned to left and right by telescopic motion of an offset cylinder
100
interposed between the first boom section
90
and the second boom section
91
, while, on the other hand, between the first boom section
90
and the third boom section
92
is interposed a connecting rod
101
, forming a link parallel to the second boom section
91
, and the third boom section
92
, the arm
93
and the bucket
94
are offset to left and right in a state parallel to the first boom
90
.
Furthermore, the axis of the lower rotating shaft
95
, connecting between the first boom section
90
and the second boom section
91
, and the axis of the upper rotating shaft
96
, connecting between the second boom section
91
and the third boom section
92
, are disposed to be mutually parallel and, as shown in
FIG. 40
, the lower rotating shaft
95
is constructed in such a way that the end part on the side closer to the arm
93
of this lower rotating shaft
95
is placed at a position lower than the end part on the opposite side (namely, sloped downward in the forward direction), when the first boom section
90
is raised to its highest position.
The backhoe device
85
indicated in
FIG. 40
is in a state in which the arm
93
is folded to the fullest extent, when the first boom section
90
is raised to its highest position (placed at the limit position of rear upward turn), and the rear end of the backhoe device
85
does not protrude backward from the rear end of the swing table
84
, making it possible for the rear end of the backhoe device
85
to turn in the swing circle with maximum diameter of the swing table
84
in plan view, when the swing table
84
is turned in that state, and thus enabling extremely-small swinging with no fear of hitting against any obstacle. This state of backhoe device
85
will be called a state stored for extremely-small swing.
A locus
77
in
FIG. 40
is the locus in which the tip part of the bucket
94
passes, with an up-down turning operation of the first boom section
90
, the arm
93
and the bucket
94
. This downward locus of the bucket
94
is produced when the bucket
94
is turned downward in the forward direction from the state in which it is folded to the fullest extent in said state stored for extremely-small swing, the arm
93
is also turned in the forward direction, and the bucket
94
is folded upward in the backward direction. As shown in the illustration, the locus
77
of the bucket
94
overlaps with the operator's cab
89
in side view, at some positions. Basically, the bucket
94
turns by the side of the operator's cab
89
when no offsetting is made, and there is no mutual interference between the two. However, in the case where the breadth of the bucket
94
is increased for an excavation work with a large breadth, etc., there are cases where interference is produced between the bucket
94
and the operator's cab
89
at points where the locus
77
overlaps with the operator's cab
89
, and such interference must be avoided.
And, in the case where the first boom section
90
is raised to its highest position, the end closer to the arm
93
(front end) of the lower rotating shaft
95
comes to a position lower than the end on the opposite side (rear end) and, for that reason, as the second boom section
91
turns around the lower turning shaft
95
, the bucket
94
moves to left and right and, as shown in
FIG. 42
, moves backward by a distance equal to the dimension V, namely in the direction coming closer to the operator's cab
89
. The locus of the tip of the bucket
94
comes more in the backward direction than the locus
77
at a time without offset in FIG.
40
.
It is when the bucket
94
is offset to the operator's cab
89
that a problem of interference with operator's cab
89
is posed. Even if the locus of the tip of the bucket
94
at a time of offset agrees with the locus
77
, the bucket
94
cannot be positioned at points where the locus
77
overlaps with the operator's cab
89
, in FIG.
40
. In addition, since the actual locus at a time of offset is further in the backward direction than the locus
77
, there are cases where interference is produced with the operator's cab
89
if any offsetting is made.
Moreover, on the swing table
84
, the operator's seat
86
is disposed astride the swing center S′ of the swing table
84
, with a cabin covering the operator's seat
86
disposed from about the front part to the rear part of the swing table
84
, thus constituting the operator's cab
89
. And, to keep an open space in the forward direction of the operator's seat
86
for better operability, the front end of the operator's cab
89
rises about vertically from the front end of the swing table
84
. The layout and construction of the operator's cab
89
disposed in the front area as described above also causes interference with the bucket
94
.
Conventional arrangement for avoiding such interference between the bucket
94
and the operator's cab
89
consisted in restricting the rolling motion of the bucket
94
or the turning motion of the second boom section
91
, by providing a mech
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