Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
~L~29~6~i~
MULTIPLE HYDRAULIC CONTROL
FIELD OF THE INVENTION
The present invention relates to hydraulic
power systems and more particularly to the conversion of
a single outlet hydraulic power system to a multiple
outlet system.
BACKGROUND
In tractors and other equipment with hydraulic
power systems for operating auxiliary units, it is fre-
quently desirable to provide more outlets for the hy-
draulic system than those with which the original
equipment was supplied. Conventionally, this involves
plumbing in one or more additional hydraulic circuits,
including extra hydraulic lines and control valves at the
operator's station, e.g. in the cab of a tr~ctor. The
conversion is time consuming and costly and the potential
leak points are multiplied.
SUMMARY
The present invention is concerned with the
provision OI an alternative system for multiplying single
hydraulic outlets to provide plural outlets.
According to the present invention there is
provided a kit for converting to a plural outlet system a
single outlet hydraulic system having a single hydraulic
.. .
~06~;~
system outlet including two hydraulic system outlet
ports, means for supplying hydraulic fluid under pressure
to the hydraulic system outlet and means including a
manually operable lever for varying the hydraulic fluid
supply to the hydraulic system outlet, said kit compris-
ing:
a plurality of two-way, two-position valves,
each having a valve inlet comprisin~ two valve inlet
ports, a valve outlet comprising two valve outlet ports,
valving means operatively connected between the inlet and
outlet and having valve open and valve closed conditions,
respectively opening and closing communication between
the outlet and the inlet, and actuator means operatively
associated with the valving means for selectively actuat-
ing the valving means into the valve open and valve
closed conditions each actuator means being independent
of each other actuator means;
valve inlet coupling means coupling the valve
inlets in parallel for fluid communication therebetween;
means for connecting the coupled valve inlets
to the hydraulic system outlet;
a control handle including a hand grip and a
plurality of manually operable control means spaced
therealong for engagement by respective fingers of an
,~
~, .
5~L
operator's hand;
means for mounting the control handle on the
manually operable lever of the hydraulic system; and
control circuit means connecting each valve
actuator means to a respective manually operable control
means for selective operation of the actuator means in
response to operation of the control.
Coupling the valve inlets to a single system
outlet provides multiple outlets that are selectively
actuable. The control for the system outlet then con-
trols whichever outlets are selected by the operator
using the control handle.
Mounting the control handle on the control
lever at the operator's station allows an operator to
select the outlet to be powered then simultaneously to
control the flow to that outlet,
The valves may be stacked valves, coupled in a
unit, with the inlets in direct communication with one
another. With such an arrangement, the multiple outlet
system can be treated as a unit that connects to the
single outlet system with quick release couplings so that
it can be transferred from one piece of equipment to
another as required.
~9~51
BRIEF DESCRIPTION OF THE DRAWINGS
In the accompanying drawings, which illustrate
exemplary embodiments of the present invention..
Figure 1 is an isometric representation of a
set of stacked valves;
~ igure 2 is a side elevation of a control
handle sectioned to show the internal structure; and
Figure 3 is a cross-sectional elevation of a
valve.
DETAILED DESCRIPTION
Referring to the accompanying drawings, Figure
1 illustrates a valve assembly consisting of three hy-
draulic selector valves 2A, 2A and 2B. Each valve is a
two-way, two-position valve constructed generally as
illustrated in Figure 4. The valve has a valve body with
an inlet including a pair of inlet ports 5, and an outlet
including a pair of outlet ports 3. The inlet passes
through the body so that when the valves are stacked as
illustrated in Figure 1, adjacent pairs of inlet ports on
adjacent valves are in alignment, so that hydraulic fluid
can pass into and from all three valves. The extra inlet
ports of the valve 2B are closed with plugs 4 IFigure 1~.
Each valve contains a spool 17 that can be displaced
along the valve body selectively to open or close commun-
ication between the inlet and the outlet.
,.~ .....
- ~9~51
In the valves 2A, the spool 17 is biased to a
valve closed condition, in which the communication be-
tween the inlet and the outlet is cut off, by a coil
spring 16 acting on the bottom of the spool and held in
place by a plug 4' threaded into the bottom of the valve
body. To move the spool to a valve open condition, in
which communication is established between the inlet and
outlet, a solenoid 1 is actuated, forcing the spool along
the valve body against the force of spring 16. The valve
2B is similarly constructed, but in this case the coil
spring 16 is omitted and a second solenoid 1 is mounted
on the valve body so that the spool 17 may be positively
displaced from either the open or the closed condition to
the other, with neither condition being a "default"
condition.
The inlet ports of the valve 2A on the left
hand side of the sides viewed in Figure l are connected
to respective hydraulic lines 5 which are in turn con-
nected to quic~ release hydraulic couplers 6 that mount
in the outlet ports of the single outlet hydraulic
system. The two outlet ports are thus coupled to the
inlet ports of all three valves and each valve can be
actuated to open and close communication between its
outlet and that of the slngle system. The two way valves
i5~
provide for supply and return flow, which may be rever-
sible depending on the control of the single outlet
system.
Figure 2 of the accompanying drawings illus-
trates a control module 11 with a series of on-off
switches 12. The switches are all connected to a power
supply 15 and each switch is connected to a respective
valve actuator solenoid 1 by an electric circuits 8. The
illustrated control module has a series of four switches
that can be used for a system with up to four solenoid
actuators 1 for the three valves 2A, 2A and 2B. The
control module is constructed as a control handle 11 with
the four switches 12 spaced along the handle. the
switches are normally open and close when pressed. The
control handle is equipped with a mounting bracket 13,
14 for mounting the handle on an existing hydraulic con-
trol lever (not illustrated~ of the original equipment
single outlet system. This means that the operator can
control both the selection of outlets and the flow to
~hose outlets with a single hand.
The use of quick release couplings connecting
the valves lnto the existing hydraulic system allows the
system to be transported readily from one hydraulic powPr
unit to another simply by uncoupling the hose connections
,~ ..... .
~:9~6Si
and the wiring harness.
While one embodiment of the present invention
has been described in the foregoing, it is to be under-
stood that other embodiments are possible within the
scope of the present invention. The invention is to be
considered limited solely by the scope of the appended
claims.
.. .
