Note: Descriptions are shown in the official language in which they were submitted.
~.~6~
This invention relatesto a control handle structure of
an excayation work vehicle~ which connects a maneuvering valve
for boom swiveling, a maneuvering valve for boom up-and-down
rocking, a maneuveriny valve for arm rocklng and a maneuvering
valve for bucket pivoting, interlockingly to two maneuvering ]e-
vers adapted for free bi-directional rocking maneuvering, in a
manner capable of separa-te individual maneuvering and capable of
simultaneous maneuvering in respective pairs.
In order to maneuver, as easily and as efficiently as
possible, a maneuvering valve forboom swiveling, a maneuvering
valve for hoom up-and-down rocking, a maneuvering valve for arm
rocking and a maneuvering valve for bucket pivoting, of an exca-
vation work vehicle, a control handle structure is used that uses
two maneuveri.ng levers adapted for free bi-directional rocking
maneuvering, which are capable of maneuvering separately the
individual valves and capable of maneuveri.ng simultaneously
them in respective pairs.
As for the interlocking connection of the two maneuv-
ering levers and the four maneuvering valves in conventional in-
stances, a mode has been adopted, wherein one interlockingly con-
nects respective pairs of the maneuvering valves each closely
,
interrelated as ~o the mancuvering, thus in two sets, and one
respectively connects them simply to the said two maneuvering
levers, via four interlocki.ng SySterQS comprising push-pull rods.
l~owever, as to -the interlockiny relationship between
said two maneuvering 1evers and four maneuvering valves, namely
as to which particular maneuvering valve and which particular rnan-
euvering valve to in-terlockingly connect to which particular
maneuvering lever, it is dirferent according to the custom pre-
vailing in -the respective countries of the world and to the par-
ticular manufacturers.
As is again referred to in detail in the later-described
embodiment of this invention, it is generally the case that for
instance in England they connect the maneuvering valve for boom
up-and-down rocking and ~he maneuvering valve for bucket pivot-
ing, interlockingly to one maneuveri.ng lever adapted for free
bi-directi.onal rocking, and connect t]le maneuvering valve for
arm rocking and the maneuvering valve for boom swiveli.ng, inter-
lockingly to the other maneuvering lever adapted for free bi-
directional rocking, while in the U.S. A. they connect the man-
euvering valve for arm rocking and the maneuvering valve for buc-
ket pivoting, interlockingly to One maneuvering lever, and con-
nect the maneuvering valve for boom up-and-down rocking and the
maneuvering valve for boom swiveling, interlockingly
~6, 348
the other maneuvering lever.
Besides, there are some manufacturers also in
Japan who adopt such interlocking connection structure as to
maneuver the maneuvering valve for boom swiveling by the
maneuvering of one maneuvering lever in the machine body
back-and-forth direction.
In order to satisfy such requirements of the re-
spective countries, including Japan as well, various formsof the maneuvering structures must have separately been
manufactured, and it has thus been quite uneconomical.
Furthermore work efficiency is reduced when an
operator having experience with the system of a particular
manufacturer is used to operate another system, due to the
operator's fear of performing erroneous maneuvers.
In view of the above-mentioned prior art and of
the recent requirements in the various countries, this
invention has as its object to provide a control handle
structure of an excavation work vehicle, capable of changing
over the interlocking relationship between the two maneu-
Yering levers and four maneuvering valves.
To attain this object, the control handle
73~8
structure of an excavation work vehicle, accordiny to this in~
vention~ is characteri~ed in that a maneuvering valve for boom
swiveling, a maneuvering valve for boom up-and-down rocking, a
maneuvering valve for arm rocking and a maneuvering valve for
bucket pivoting are disposed suhstantially in parallel that
these four maneuvering valves are interlockingly connected, in a
manner capable of separate individual rnaneuvering and capable
of simultaneous maneuvering in respective pairs, via four inter-
locking systems parallel with one another usi.ng the respective
push-pull rods, to two maneuvering levers adapted for free rock-
ing maneuvering crosswise in back-and-forth and right-and-left
directions of the machine body; and that there is provi.ded, in-
termediary to the said interlocking systems, an interlocking
mode change-over mechanism for changing the mode of the interloc-
king between the two maneuvering levers and the said four maneu-
vering valves.
It is therefore possible to interlockingly connect the
two maneuvering levers adapted for free rocking crosswise in
back-and-forth and right-and-left directions of the machine
body and the maneuvering valve for hoom swiveling, maneuvering
valve for boom up-and-down rocki.ng, maneuvering valve for arm
rocking and maneuvering valve for bucket pivoting, in any com-
bination therebetween as to conform to the custom or the actual
state as is prevailing in the respective
/
countries in which they use the excavation work vehicle. This
results in bringing forth the advantage, by the maneuvering por-
tion structure of this invention, of inexpensively providiny the
excavation work vehicle without manufacturing various specific
forms of maneuvering portion struc-ture.
It is also possible, in the case there is any specific
mode of the maneuvering lever system with which the operator is
well acquainted and experienced, to change over into such mode
of the maneuvering lever system properly suited to the operator,
thus resulting as well in bringing forth the advantage of enhanc-
ing the work efficiency and of promoting the safety, by the con-
versant maneuvering sense.
The second object of this invention is to have, when
the rnaneuvering valve for boom up-and-down rocking wllich con-
trols oil of a first oil hydraulic pump is maneuvered, oil of a
second oil nydraulic pump make confluence with the oil of the
first oilhydraulic pump, thus to have the up-and-down rocking
speed of the said boom get speed raising, and for this purpose
there is provided a maneuvering valve for first confluellce and it
is interlockingly connected to the said maneuvering valve for
boom up-and-down rocking in a manner capable of simultaneous ma-
neuvering therewith.
Furthermore, the third object of this invention
'3 ~3
is to make, when the said maneuverillg valve for boom up-and~down
rocking is not in use, the oil of the first oilhydraulic pump con-
fluence with the oil of the second oilhydraulic pump, thus to
have the actuation speed of the arm rocking or the bucket pivot-
ing or e]se both of t:hem get speed raising, and for -this puxpose
there is provided a maneuvering valve for second confluence, to
be maneuvered in interlocking with push-pull actuation of the
maneuvering valve for bucket pivoting or t-he maneuvering valve
for arm rocking, in juxtaposition of the said respective maneu-
vering valves via a confluence maneuvering mechanism.
Other objects and advantages of this invent;on wi]l be-
come clear from the description of the specific embodiment to
follow hereunder and the showing of the accompanying drawings.
The drawings show, by way of example, the best mode of
the embodiment of the control handle structure of an excavation
work vehicle, according to this invention, wherein:
Fig. 1 is a side elevation of the excavation work ve-
hicle;
Fig. 2 is a diagram of the oilhydraulic circuit of the
excavation work vehicle;
Fig. 3 is a schematic perspective view of the control
handle structure;
Fig. ~ is a view showillg a portion of interlocking mode
change-over mechanism partly cut away and partly in section;
Fig. 5 is a schematic perspective view of the control
handle structure, showing a state for interlocking relationship
73'~
as has been changed over;
Fig. 6 is a schematic perspective view showing conflu-
ence maneuvering mechanism;
s
Fig. 7 is a schemati,c perspective view of the confluence
maneuvering mechamism, showing the state of maneuvering same;
Fig. 8 is a schematic vi,ew showing interlocking rela-
tionship of another maneuvering section;
Fig. 9 is a schematic perspective view showing the con-
trol handle structure of Fig. 8;
Fig. 10 is a plan view of the control handle structure
of Fig. 8, for interlocking relationship as has been changed over;
Fig. 11 is a plan view of the control handle structure
of Fig. 8, for in-terlocking relationship as has been changed over;
Fig. 12 is a plan view of the control handle structure
of Fig. 8, for interlocking relationship as has been further chan-
ged over; and
Fig. 13 is a plan view of the control handle structure
of Fig. 8, for interlocking relationship as has been further
changed over.
~.
~ J~8
This invell-ti.on is now explained in more detail hereunder
with reference to the accornpanying drawings.
~i~. 1 shows a shoveling work vehicle as a specific
example of an excavati.on work ~ehicle of thls invention. This
shoveling work vehicle is provided with a swivel tah]e (3) as
attached to the machine body (2) equipped with crawler travel ap-
paratus (1~, for free pivotal maneuvering about an upright axis,
and on this swivel tab]e (3~ further with an operation cab (4)
and a prime mover cab as are mounted there as well as an excava-
tion work apparatus (5). In constructing the excavation work ap-
paratus (5) r one provides a boom (8) free to rock about a per-
pendicular axis relative to a bracket (7) uprightly provided on
the said swivel table (3), connects to a tip end of the said boom
(8) an arm (10) with a bucket(12) connected at a tip end thereof.,
and provides: a fluid pressure cylinder (9) for rocking up and
down the said boom (8) relative to the said bracket (7); a fluid
pressure cylinder (11) for expansively and retractively rocking
the said arm (10) about a perpendicular axis relative to the said
boom (8); and a fluid pressure cylinder (13) for making the said
bucket (12) pivot about a perpendicular axis relative to the
said arm (10).
-- 8
~6 ,~3 ?~8
In cons-tructing the fluid pressure driving system, as
shown in Fig. 2, a maneuvering valve (Vl) for a fluid pressure
motor (M) for swiyel kable driYing in order to swivel the said
hoom (8) by the piYoting of the said swiYel table (3), a maneu-
vering valve (V2) for the cylinder (11) for arm rocking, a maneu-
vering valYe (V3) for first confluence for increasing boom rais-
ing speed, a maneuYering valve (V4) for a fluid pressure motor
(Ml) for a travel apparatus of one of the right and left crawlers,
and a maneuvering valve (V5) for -the said cylinder (13) for buck-
et pivoting are constructed in a stack valve type provided with
a center bypassing flow path and are parallely connected to a
first fluid pressure pump (Pl). A maneuvering vlave (V8) for
the said cylinder (9) for boom up-and-down rocki.ng, a maneuvering
valve (V7) for a fluid pressure motor (M2) for a travel apparatus
oE the other of the right and left crawlers, and a maneuvering
valve (V6) for second confluence for causing the said arm (10)
and bucket (12) -to increase speed are similarly constructed in a
stack valve type provided with a center bypassing flow path and
are parallelly connected to a second flui.d pressure pump (P2).
As shown in Fig. 3, the said maneuvering valves (Vl) -
(V8) are disposed in juxtaposition in the machine body transverse
direction, with the respective sliding spools (not shown) in the
state of extendi.ng in the
i7;~
machine body back-and-fortil direction. Two, namely a first and
a second, maneuvering ].evers (14~ (15) adapted for free rocking
maneuvering crosswise or bi-directionally in the machine body
back-and-forth and right-alld-left directions for maneuvering the
said maneuvering valves (Vl), (V2), (V3), (V6), (V8) are provided
in juxtaposition in the machine body transverse direction in
front of these maneuvering valves. Two, namely a third and a
fourth "naneuvering levers (16),(17) adapted for free rocking
maneuvering in the machine body back-and-forth direction for
maneuvering the said maneuvering valves (V4),(V7) are provided in
justaposition inthemachine body -transverse direction in between
the said crosswisely rocking maneuvering levers (14),(15).
The maneuvering combination mode of the said four man-
euvering levers (14),(15),(16),(17) and the said ei~ht maneuvering
lves (Vl)~(V2)~(V3)~(V4)~(V5)~(V6),(V7),(V8)~ to be described
in detail hereunder, is the mode adopted mainly in England and so
forth.
The said first maneuvering lever (14) and the said ma-
neuvering va].ve (Vl) for boom swiveling are inter]ockingly con-
nected to each other by means of a first i.nterlocking system (Rl)
comprising a push-pull rod (18) via an interlocking member (19)
so adapted that the sliding spool ( not shown) of the
valve may be maneuvered in push-pull manner by the maneuvering of
the said first maneuvering lever (14) i.n t-he machine transverse
direction.
-- 10 --
. ~. .~.
1~7~
The said first maneuvering lever (14) and the said maneuvering
valve (V2) for arm rocking are interlockingly connected to each
other by means of a second interlocking system (R2) comprising
push-pull rods (20a),(20b) via an interlocking mem~er (2l) so
adapted that the sLiding spool (not shown). of the valve may be
maneuvered in the inachine body back-and-forth direction. The
said third maneuvering lever (16) is interlockingly connected,
by means of a third interlocking system (R3) comprising a push-
pull rod (22) via an interlocking member (23) adapted for maneu-
vering in push--pull manner the sliding spool (not shown) of the
said maneuvering valve (V4) of the fluid pressure motor (~1) for
the crawler travel apparatus on the left side, thus to the said
maneuvering valve (V4). lrhe said fourth maneuvering lever (17)
is interlockingly connected, by means of a fourth interlocking
system (R4) comprisi.ng a push-pull rod (24) via an interlocking
member (25) adapted for maneuvering in push-pull manner the s].iding
spool (not shown) of the said maneuvering valve (V7) of the fluid
pressure motor (M2) for the crawler travel apparatus on the right
side, thus to the said maneuveri.ng valve (V7). The said second
.naneuvering lever (15) is interlockingly connected, by means of
a fifth interlocking system (R5) compri.sing push-pull rods (26a),
(26b), via an interlocking member (27), to maneuver in push-pull
manner, by the maneuvering thereof in the machine body transverse
. .
~ti'73 ~3
direction, the sliding spool (not shown) of the said maneuvering
valye (V5) for bucket plvoting, thus to the valve.
Furthermore, the said second maneuYering leYer (15) is
interlockingly connected, by means of a sixth lnterlocking sys-
tem (R6) comprising push-pull rods (28a),(28b~,(28c),(28d) and a con-
nection rod (28e~ connecting the rods (28c),(28d), via an inter-
locking member ~291, to maneuver in push-pull manner, by the
maneuvering thereof in the machine body back-and-forth direction,
lQ the respective sliding spools (not shown) of the said maneuvering
valve (V8) for boom up-and-down rocking and the said maneuvering
valve (V3) for first confluence for increasing boom rocking speed,
thus to both the said valves (V8),(V3).
Midway between the said second maneuvering lever (15)
and maneuvering valve (V5) for bucket pivoting there is rotatably
provided a bucket-maneuvering intermediary pipe shaft (38) with
its axis directed in the machine body transverse direction. On
this intermediary pipe shaft (38) there is downwardly protruding-
ly provided a first connection arm (39) for connecting the said
push-pull rod (26b) to the sliding spool (not shown) of the said
maneuvering valve (V5), with one end of the said push-pull rod
(26b) rockably pivoted on tip end portion thereof.
2S Furthermore, in order to rockably connect the
-- 12 --
73~8
said push-pull rod (26a) to a connection arm (27b) down-
ward.ly protrudingly provided on. a pipe shaft (27a) of an
interlocking member (27) adapted to pivot the said bucket-
man.euvering intermediary pipe shaft (38) by the maneuvering
of the said secon.d maneuvering lever (15) in the machine
body lateral direction., there is downwardly protrudingly
provided on. the said in.termediary pipe shaft (38) a second
conn.ection. arm (~0),
~leans for conn.ectin.g the said respective push-
pull rods (26a),(26b) and the respective first and secon.d
conn.ection arms (39),(40), an.d the rod (26b) and the said
conn.ection arm (27b), will become clear at the description. t
oxpl~ ror~- of Fig, 4, to be given. hereinafter,
~lidway aroun.cl the said second interlockin.g system
(R2) an.d sixth in.terlocking system (R6) between the said
first an.d secon.d man.euverin.g levers (lL~),(15) ~md both the
said maneuvering valves (V2),(V8), there is provided an
in.terlocking mode change-over mechan.ism (30) adapted to change
over the modes of the respective interlocking relation.ships.
As this in.terlocking mode change-over mechanism
(30), an. arm-maneuverin.g in.termediary pipe shaft (31)
an.d a boom-man.euv0ring in.termediary pipe shaft (32) are
rotatably provided in. parallel to each other, more particularly
these in.termediary pipe shafts (31),(32) are so disposed
that their rotation. axes extend in the direction.normal
to the mar.euvering direction. of the said respective juxtaposed
- 13 -
~6~73~3
push-pull rods (20a) 7 ( 28a) of the second interlocking
system (.R2) and the sixth interlocking system (R6). Now,
on. the said arm-man.euvering in.termediary pipe shaft (31)
there are protrudingly provided in one a.n.d the same direction.,
namely both downwardly a first conn.ection arm (33) for
connectin.g the push-pull rod (20a) of the said second in.ter-
locking system (Rz), made releasable and remoun.table,
interlockingly with the said first man.euvering lever (14~;
and a second conn.ection. arm (34) for enablin.g its interlock-
ing connection with the said second man.euverin.g lever (15)
by modifyingly remounting thc said releasable and remountable
push-pull rod (20a).
On. the other hand, on the said boom-maneuvering
in.termediary pipe shaft (32) there are protrudingly provided
in. on.e an.d the same direction., namely both downwardly: a
first conn.ection. arm (35) for conn.ecting the push-pull rod
(28a) of the said sixth in.terlocking system (R6), made
releasable and remoun.table, in.terlockingly with th0 said
secon.d maneuverin.g lever (15); and a second connection arm
(36) for com~.ecting same in.terlockin.gly with the said first
man.euverin.g lever (14). At the tip end portion of the first
conn.ection. arm (33) of the said arm-man.euvering in.termediary
pipe shaft (31) there is pivotally attached, as shown in.
Fig. 4, a conn.ection. member (33a), screw bores being *hreaded
in. both en.d portion.s of this connection. member (33a) and
the said push-pull rods (20a),(20b) being respectively
- 14 -
3~3
screwecl into these screw borcs. ~ connection member (36a)
o~ thc- structur~ the same as thi.s connectioD membcr (33a)
is pivotally attaclled to the ti.p~3 end portion of the second
connect.ion arm (36) of the said boom-maneuvering intermediary
pipe sha:ft (32)
0n the other hancl., on a :Eirst connection arm (21b)
downward.ly protrudingly provided on a pipe shaft (21a)
forming a part of the interlocking member (21) o:E the said
first maneuvering lever (14) there is pivotally attachecl
a yoke (21c~ at the tip end thereof, a.nd to this yoke (21c)
there is screwin.gly attached the other end of the said
push-pull rod (20a),
Thus, the said push-pull rod (20a) is releasable
from and remountabl.e to both the said connection arms (33),
(Z1b),
The reason why -the in.termediary portion of the
said push-pull rod (20a) is ~ Fig, 3~arcuate is to make
this rod (20a) - when modifyingly remounted, for interloclcing
interconn.ection of the secon.d conn.ection arm (34) of the
said arm-man.euverin.g in.termediary pipe shaft (31) and the
said secon.d man.euvering lever (15), to bridge between a
connection. arm (29b), downwardly protrudingly provided on
a pipe shaft (29a) forming a part of the in.terlocking member
of this lever (15),an.d the said second conn.ection. arm (34~
- n.o-t to abut again.st the first conn.ection. arm (35) of the
said boom-man.euvering intermediary pipe shaft (32) (see
Fig, 5~.
-- 15 --
By means of the above--menti.oned ;nterlocking mode change-
over mechani.sm (30~, it is possible to change over the maneuver-
ing of the said maneuvering valve (V2) for arm rocking, from the
first maneuvering le-ver (14) to the second maneuvering lever (15),
simply by altering the mounting posi.ti.on of the said push-pull
rod (20a). Likewise, it is possible to change over the maneu-
vering of the said maneuvering valve (V8) for boom up-and-down
rocking and of the said maneuvering valve (V3) for fjrst conflu-
ence, from the said second maneuvering lever (15) ~o the said
first maneuvering lever (14), simply by altering the mounting
state of another push-pull rod (28a) from the state of connecting
the fi.rst connection arm (35) of the said boom-maneuvering inter-
mediary pipe shaEt (32)
and the connection arm (29b) of the said second
maneuvering lever (15) to the state of connecting the second con-
nection arm (36) of the said boorn-maneuvering intermediary pipe
shaft (32) of a second connection arm (21c) downwardly protruding-
ly provided on the pipe s~laft (21a) of the interlocking member
(21) of the said first maneuvering lever (14). Fig. 5 shows
this interlocking connection mode. This maneuvering combination
mode is generally prevalling in the U.S. A.. As illustrated,
it is possible to maneuver: the maneuveri.ng valve (V8) for boom
~-and-down rocking and the maneuvering valve (V3) for first con-
~-luence for speed increasing thereof by means o~
- 16 -
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maneuvering of one, namely the first, maneuvering lever (14) in
the machine body back-and-forth direction, and the maneuvering
valYe (Vl) for boom swiveling by means of maneuvering in the
machine body transverse direction; and to maneuYer: to maneuver-
ing valve (V2) ~or arm rocking by means of maneuvering the other,
namely the second, maneuvering lever (15) in the machine body
back-and-forth direction, and the maneuvering valve (V5) for buc-
ket pivoting by means o~ maneuvering in the machine body trans-
verse direction. ~s for other structures in Fig. 5, such are sub-
stantially the same as the structures in Fig. 3, and description
in detail thereof shall therefore be omitted.
Now, description is given, with reference to Fig. 3, Fig.
6 and Yig. 7, of a confluence maneuvering mechanism (37) capable
of maneuvering the said maneuvering valve (V6) for second con-
fluence, upon having maneuvered the maneuvering valve (V2) for
arm rocking by means of the first maneuvering lever (14) in Fig.
3 and the maneuvering valve (V5) for bucket pivoting by means of
the second rnaneuveringlever (15) either simultaneously or separa-
tely individual]y, without suffering from interference therebe-
tween. The confluence maneuvering mechanism (37) is constructed
with: the said arm-maneuvering intermediary pipe shaft (31); the
sa;d bucket-maneuvering intermediary pipe shaft (38); and an in-
telmediary pipe shaft (41) for confluence maneuvering, rotatably
provided in parallel with these pipe shafts
~6'73~
(31),(38), ~s shown in Fi~. 6~ o-n the said arm-maneuvering
intermediary pipe shaft (31) and bucl~et-maneuvering inter-
mediary pipe shaft (38) -there are consolidatedly pro~ided
respective pairs of third and fourth connection arms (42);
(43),(44),(LI5) a.s spaced apart in the machine body transverse
direction a:nd protr~ding down~ardly On. the said inter-
mediary pipe shaft (41) for confluen.ce maneuvering there
are respectively con.solidatedly provided - at the positions
in the machine body transverse direction in substantially
the same phase as the said connection arms (42)-(45) -
s t
a fi~t, a second, a third and a fourth connection arms(46),(47),(48),(49) to correspon.d in. pairs of two each, to
the third and fourth connection arms (42),t43)~ (44),(45)
of the in.termediary pipe shafts (31),(38), respectively;
with each one thereof (46),(48) extending upwardly and t:he
other (47),(49) exten.ding downwardly; and on free en.d side
of these conn.ection arms (46)-(49) there are provided pins
(46a),(47a), (48a),(49a), respectively. ~t the connecting
portions on one end side of push-pull rods (50),(51),(52),
(53) for connection, adapted to engage with these pin.s
(46a), (47a), (48~, (49a)~ there respectively are defined
oblon.g open.in.gs (a); while portio.n.s on. the other end side
thereof are respectively pivotally affixed to the third
and fourth conn.ection arms (44), (45) o~ the said bucket-
man.euvering intermediary pipe shaft (38) an.d to the third
and fourth conn.ection arms (42), (43) o~ the said arm-
- 18 -
7 3 ~ 8
maneuvering intermediary pipe shaft (31), Furthermore~
on the said confluence maneuverin.g intermediary pipe shaft
(41) there is pro-trudingly provided a fifth connection. arm
(54) e~tendin.g downwardlyS and a push-pull rod (55) inter-
connects same and the said valve (V6) ~or second confluence
~s for the positional relationship of the said pins (46a),
(47a)~(4~a)~(49a) relative to the respective oblong
openings (a) of the said push-pull rods (50),(51),(52),
(53), it is so made that the pins (46a),(48a) of the
upwardly protrudin.gly provided first and third connection
arms (46)~(48) are position.ed, when the said maneuvering
valve (V1) for arm rocking and the said maneuvering valve
(V5) for bucket pivoting are in the neutral posi-tion, at
the end of the said respective oblong openings (a) on the
side toward said both the maneuvering valves (V1),(V5),
as shown in Fig, 6, while the pins (47a),(49a) of -the
downwardly protrudingly provided second an.d fourth connection
arms (47),(49) are positioned at the end of the said respective
oblon.g openin.gs (a) on. the side toward the said first
man.euverin.g lever (14) Therefore, when for instan.ce the
first man.euverin.g lever (14) has been. maneuvered in pullin.g
toward the machin.e body rear side for raisin.g the arm (10)
an.d thus the said arm-maneuvering in.termediary pipe shaft
(31) has been rotated via the said push-pull rod (~Oa),
then the said push-pull rod (52) connected to this in.termediary
pipe (313 pushes the said pin. (48a), and the said con.fluen.ce
_ 19 _
3~
maneuvering intermedi.-ary pipQ shaft t41) is rotatecl in
counterclocl~wise rotation, whereby the secoDd confluence
valve ~V6) is maneuvered via the fifth connection arm (54)
~t this time, the pin (46a) of the sai.d first connection
arm (46) mal~es displacemen.t, as shown in Fig 7, only to
the middle of the opening (a) of the said push-pull rod
(50)~ and thus exerts no influence on this rod (50),
Thus, it is possible to retain in the n.eutral position
th.e said maneuverin.g valve (V5) for bucket pivoting which
is man.euvered by the said push-pull rod (50) via the said
bucket-man.euvering intermediary pi.pe shaft (38). In other
words, the second maneuvering lever (15) suffers no inter-
feren.ce from such m~n.euvering, With this construction,
it is likewise apparen.t that the second man.euvering lever
(15) and the said valve (V5) for bu.~ket pivoting su~fer
n.o in.terference even. if the said ~irst man.euvering lever
(14) is man.euvered in. the opposite direction, namely toward
the machin.e body fron.t side. The con.fluence maneuverin.g
mechan.ism (~7) thus gives play to its fun.ction as men.tion.ed
hereinabove by the combination. of the positioning of the
respective oblong openings (a) an.d the pin.s (46a),(47a),
(48a),(49a) engagin.g therewith an.d the disposing of the
protruding direction.s of the respective connection. arms.
Now, on. the interlocking mode change-over
mechan.ism (30) to change over the in.terlockin.g relationship
of the above-mention.ed two man.euverin.g levers and four
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~3 ~7~3~8
manellvering valves, another form of the emhodiment is described
in detail hereunder with reference to Fig. 8 - Fig. 13.
In constructing the maneuvering portion structure for
the maneuvering valve (Vl) of the motor (M) for boom swiveling and
the maneuver;ng valves (V8),(V2),(V5) for the boom cylinder, for
the cylinder and for the bucket cylinder, it is made up, as shown
in Fig. 8, by connecting the -two ]evers (14),(Z5) adapted to be
maneuvered in bl-directional rocking abo~t axes (X),(Y), more spe-
cifically to the maneuvering sections (Sl),(S2),(S3),(S4) thereof,rods (Bl),(B2),(B3),(B4) in juxtaposition extending in parallel
to one anot~ler; and by engaging the valve (V2) to the rod (Bl),
the swivel valve (Vl) to the rod (s2), the boom valve (V8) to the
rod (B3) and thebucket valve (V5) to the rod (B4), in such state
that the respective spools are in parallel to one another; to
thus drive the swivel table (3) by the maneuvering of the first
maneuvering lever (14) in the back-and-forth rocking relative to
the operation seat (4), the arm (10) by the maneuvering of the
first lever (14) in right--and-left rocking, the boom (8) by
the maneuvering of the second lever (15) in back-and-forth rocking
and the bucket (12) by the maneuvering of the second lever (15) in
right-and-left rocking, respectively.
~onsideration is paid to make it possible to provide,
Midway around the said rod interlocking systems,
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7~8
the interloclcing mo-le change-over mechcmism (30) for
altering the interlocking relationship of the levers
(14)~ (15) and. the sliding spools for the valves
In constructing the said interlocking ~ode
change-over mechan.i.sm (30), it is made up, as shown in
Fig, 9, by journaling, in brackets (62)~(63) for free
rot~tion, two, namely a first and a seco.nd interloeking
shafts (60), (61), havi:ng the axes made to exten.d in the
juxtaposed arraying directi.on of the rocl. in.terlocking systems;
by fittingly putting a firs-t tubular body (64) on and
around an intermediary portion of the first shaft (60)
and a seeond ancl a third tubular bodies (65), (66) on and
around the seeond shaft (61), respeetively in a mam~.er
free to make relative rotation; by seeurely fixing -
respeetively on. to the first tubular body (64) and the
seeond tubular body (65) ~nd on the first shaft (60) ancl
the third tubular body (66) - two sets of first interloeking
deviees (67), (68) formed eaeh by pivotally bridging a link
over two arms; an.d by seeurely fixing - respectively on
to thé first shaft (60) and the first, seeon.cl and third
tubular bodies (64),(65),(66) - seeond interloeking deviees
(69),(70),(71),(72) formed eaeh by pivotally eonneeting a
rod on an arm
In altering the interloeking systems by means of
the interloeking mode ehange-over meehanism (30) of the
above-deseribed eonstruetion. in the rod interloeking systems
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73~8
shown in. Fig. 8, it is possible to obtain rod în.terlocking
systcms ~ff~will alter the maneuvering objects - more
specifically the arm (10) ~nd the boom (8)by the
man.euvering levers (14)~ (15) - by dismantling the rods
(B1), (B3) ~nd by respectively pivotably conn.ecting~ as
shown. in. Fig 10, the interlocking device (69) of the first
shaft (60) with the maneuvering section. (Sl)~ the inter-
locking device (70) of the first tubula.r body (64) with the
maneuvering section. (S3), the interlocking device (71) of
the second tubular body (65) with the man.euvering valve
(V2), and the interlocking device (72) of the third tubular
body (66) with the maneuvering valve (V8) Besides, it is
possible to obtain. rod interlocking systems ~ will alter
the man.euvering objects - more specifically the swivel
table (3) aDd the bracket (12) - in the rod interlocking
systems shown. in Fig 8, by disman.tling the rods (B2), (B~l)
and inverting the interlocking shafts (60), (61) and
futher by respectively pivotally con.n.ecting, as shown. in
Fig 11~ the in.terlocking device (70) of the first tubular
body (64) with the maneuvering section (S2), the interlocking
device (69) of the first shaft (60) with the man.euvering
section. (SL~), the in.terlocking device (72) of the third
tubular body (66) with the man.euverin.g valve (Vl), and the
interlocking device (71~ of the second tubular body (65)
with the ma~euverin.g valve (V5)
Still further, this in.terlocking mode change-over
~673 ~
mechanism (30) may be so made, as shown in Fig. 12, by
disposing the fi.rst shaft (60~ in -the state as that of
~ig. 10 while as for the first tubular body (64), the
second tubular bocly (65) and the third tubular body (66)
commonly making -them move upwardly from the state as that
of l?ig, 11 an.d rotatin~ them by 1~0 , ~thus to respectively
interlockingly connect: the maneu~ering section (S1) of
the maneuvering in the machine bod.y back-and-forth direction.
of the said first maneuvering lever (14) with the maneuvering
valve (V1); the maneuvering section (S2) of -the maneuvering
in the machin.e body transverse direction of the said first
maneuvering lever (14) with the maneuvering valve (V2) the
rod (B3), connected to the man.euvering section (S3) of the
man.euvering in the machine body back-and-forth direction
of the said second man.euvering lever (15), with the said
maneuverin.g valve tV~) for boom up-an.d-down. rocking; and
the rod (B4), conn.ected to the maneuvering section. (S4) of
the man.euvering in the machine body tran.sverse direction.
of the said second man.euvering lever (15), with the said
man.euvering valve (V5) for bucket pivoting
Yet further, the said in.terlocking mod0 change-
over mechan.ism (30) may as wéll be made in such construction,
as shown in. Fig, 13, where the first shaft t60), the first
tubular body (64), the second tubular body (65) and the
third tubular body (66) are inverted from the state of Fig.
12, with the middle portion. of the first an.d the second
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73~;8
e 7~0 ~ e
shaf-ts (60), (61) as the inverslon center, ~ y, it is
made possible to maneuve:r the said maneuvering valve (V2)
for arm rocl~ing by means of the maneuvering of the first
man.euvering lever (14) in the machine body lateral direction,
and the said maneuvering valve (Vl) for boom swiveling by
means of the maneuvering thereof in the machin.e body bac~-
and-forth direction; and it is made possible to maneuver
the said maneuvering valve (V8) for boom up-and-down rocking
by means of the man.euvering of the second maneuvering lever
(15) in the machine bo~y back-and-forth direction, and
the said maneuvering valve (V5) for buc~et pivoting by
mean.s of the maneuvering thereof in the machine body
transverse ~irection.. ~ith provision as men.tion.ed hereinabove,
thus for having in.terlocking rotation shafts interpose in
the intcrlocking systems, which shafts are adapted for
alterable in.terlocl~ing relationship with push-pull rods,
in. such manner as to once transform, midway in. the interlocking
systems, the lin.ear movements of the rods to rotation.al
mov0men.ts and take out the rotation.al movements Erom the
respective differen.t locations in. the rod justaposed
arraying direction., and to restorin.gly transform the rotational
movemen.ts back to the linear movemen.ts and tran.smit same
to the valve spools~ and so forth; it is made possible,
in. the case the give mode of the man.euverin.g is differen.t
from the previously conversant man.euvering mode, to modify
the given. mode to conform to such previous maneuvering
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r~3 3 9L I~3
mode, thus to bring forth the advan-tage of managing to properly
use any different set of the machines safely with e~cellent work
efficiency always retaining one and the same maneuvering sense
with such provision of the versatile construction ready for alter-
ing the maneuver;.ng mode upon any possihle need.
By the way, though it has been supposed to cause swivel-
ing of the boom (8) by means of khe swiveling maneuvering of the
swivel table (3), it is as well possible to provide a maneuvering
valve for a cyli.nder rocking, either instead of the swivel valve
(Vl), or else to provide a flow path change-over valve for such
cylinder and the motor (M) for boom swiveling so as to have the
valve (V~) dually serve also for causing the boom (8) to make
rocking by means of the cylinder rocking.
As is clear from the above description, the maneuvering
portion structure of an excavation work vehicle, according to
this invention, can alter the maneuvering systems thereof in order
to realize e~cavationwork without arroneous maneuvering and with-
out lowering the work efficiency even by any operator and underany actual condition prevailing in the pertinent country, t]lUs hav-
ing any different mode of the maneuvering as habit or custom, and
is thus of -the tremendous advantage in the industrial application
thereof.
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