U.S. patent number 3,922,855 [Application Number 05/502,829] was granted by the patent office on 1975-12-02 for hydraulic circuitry for an excavator.
This patent grant is currently assigned to Caterpillar Tractor Co.. Invention is credited to John W. Bridwell, Donald L. Hopkins, Kenneth R. Lohbauer.
United States Patent |
3,922,855 |
Bridwell , et al. |
December 2, 1975 |
Hydraulic circuitry for an excavator
Abstract
A hydraulic circuit is provided for powering a wheel-type
excavator with a plurality of pumps supplying pressurized fluid for
the circuit. The circuit is arranged so that fluid is provided from
a plurality of pumps in a sequence manner to permit maximum
utilization of pump volume for translation of the machine. A unique
sequence of the distributor valves also provides positive
independent control of the various implement motors of the machine,
with means provided so that fluid may also be combined to operate
selected implement motors for faster operation and maximum
efficiency of the machine.
Inventors: |
Bridwell; John W. (Peoria,
IL), Hopkins; Donald L. (Joliet, IL), Lohbauer; Kenneth
R. (Joliet, IL) |
Assignee: |
Caterpillar Tractor Co.
(Peoria, IL)
|
Family
ID: |
26901894 |
Appl.
No.: |
05/502,829 |
Filed: |
September 3, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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207027 |
Dec 13, 1971 |
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Current U.S.
Class: |
60/421; 60/484;
91/519; 91/531; 60/428; 60/486; 91/528; 414/694 |
Current CPC
Class: |
E02F
9/2239 (20130101); E02F 9/2221 (20130101); E02F
9/2296 (20130101); B62D 11/183 (20130101); E02F
9/2292 (20130101); F15B 11/17 (20130101); E02F
3/42 (20130101); E02F 9/2282 (20130101); F15B
2211/30595 (20130101); F15B 2211/7142 (20130101); F15B
2211/3051 (20130101); F15B 2211/3116 (20130101); F15B
2211/329 (20130101); F15B 2211/67 (20130101); F15B
2211/78 (20130101) |
Current International
Class: |
E02F
9/22 (20060101); B62D 11/06 (20060101); B62D
11/18 (20060101); F15B 11/00 (20060101); E02F
3/42 (20060101); F15B 11/17 (20060101); F15B
013/06 (); F15B 013/09 () |
Field of
Search: |
;60/421,428,484,486
;91/414 ;214/138R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Geoghegan; Edgar W.
Attorney, Agent or Firm: Phillips, Moore, Weissenberger
Lempio & Strabala
Parent Case Text
REFERENCE TO RELATED APPLICATION
The present invention is a continuation-in-part of our copending
application Ser. No. 207,027 filed Dec. 13, 1971, entitled
Hydraulic Circuitry for an Excavator.
Claims
We claim:
1. A hydraulic circuit for a hydraulic excavator comprising:
a first and a second variable displacement pump for supplying
pressurized fluid to said circuit;
a first series of series-connected distributor valves operatively
connected for directing fluid from said first pump to a translation
motor and to a first pair of implement control motors;
a second series of series-connected distributor valves operatively
connected for directing fluid from said second pump to said
translation motor and at least another implement control motor;
pilot control means for shifting said distributor valves for said
translation motor in sequence;
said pilot control means including a source of pressurized pilot
control fluid;
drive control means including pilot valve means operative to direct
said pilot fluid for shifting said distributor valves controlling
said translation motor and operative to vary the pressure of said
pilot pressure over a wide range of pressures; and,
the first of said distributor valves being operative to shift
progressively over a first range of pilot fluid pressures and the
second of said distributor valves being operative to progressively
shift over a second range of pilot fluid pressures so that the
first pump is operative to supply fluid for low speed operation and
fluid from said second pump is added to said first pump fluid for
high speed operation.
2. The hydraulic system of claim 1 wherein said drive control means
comprises a first distributor valve for directing fluid from a
first of said pumps to said translation motor;
a second distributor valve operative to direct fluid from a second
of said pumps to said translation motor;
pilot control means for operating said distributor valves;
said pilot control means including a valve operative to provide a
variable pilot pressure signal to said distributor valves;
said first distributor valve being responsive to a first range of
pressures of said pilot signal; and
said second distributor valve being responsive to a second range of
pressures of said pilot signal.
3. The hydraulic system of claim 2 wherein said drive control means
includes a directional control valve for selecting the direction of
shifting of said distributor valves.
4. The hydraulic system of claim 3 wherein said first distributor
valve includes means for restrictively communicating fluid from
both sides of said translation motor to the sump when said
distributor valve is in a neutral position.
5. The hydraulic circuit of claim 1 including dual-pressure relief
valve means having a first relief pressure when said translation
motor is in operation, and a second relief pressure when said
implement motors are in operation.
6. The hydraulic circuit of claim 4 wherein said circuit includes
diverter valve means at the end of each of said series of
distributors operative to direct fluid from downstream of each of
said series to the last distributor in the other of said
series.
7. The hydraulic circuit of claim 6 wherein said circuit includes a
pair of distributor valves downstream from said diverter valves for
directing fluid for operation of a pair of outrigger jacks.
8. The hydraulic circuit of claim 6 wherein said circuit includes a
third pump and a distributor for separately supplying fluid for
operation of a slewing motor for said excavator, and a pair of
distributor valves downstream of said slewing distributor for
directing fluid to a pair of outrigger jacks.
9. The hydraulic circuit of claim 6 wherein said circuit includes a
dual relief valve assembly having a first relief valve operative
when said translation motor is in operation, and a second relief
valve operative when said translation motor is not in
operation.
10. The hydraulic circuit of claim 9 wherein said relief valve
assembly includes a shuttle valve that is responsive to said pilot
valve means to bypass said second relief valve and said second
relief valve has a lower relief setting than said first relief
valve.
11. The hydraulic circuit of claim 9 wherein said first range of
pilot fluid pressures is from 35 to 155 psi, and said second range
of pilot fluid pressure is from 145 to 218 psi.
12. A hydraulic system for powering the translation motor and
implements of an excavator having a boom, a stick, and a bucket
supported on a rotatable platform, said system comprising:
a first and a second variable displacement pump driven by an
internal combustion engine;
a single translation motor for propelling the vehicle;
a slew drive motor for controlling the movement of the
platform;
a boom control motor;
a stick control motor;
a bucket control motor;
a first series of interrupted series-connected distributors
connecting said first pump first to the translation motor and
lastly to said stick control motor; and
a second series of interrupted series-connected distributors
connecting the second pump first to the translation motor, then to
said bucket control motor, and lastly to said boom control
motor;
the first distributor in each of said series being operated by
single pilot control means operative to shift the first of said
first distributors over a first range of pilot control pressure and
to shift the second of said first distributors over a second range
of pilot control pressure so that said translation motor operates
from said first pump over said first range and from both pumps over
said second range; and
the last distributor in at least one of said series being operative
to combine fluid available from the other series for operation of
its respective control motor.
13. The invention of claim 12 comprising a third pump and a
distributor valve operative to direct fluid from said third pump to
said slew control motor independent of said translation motor.
14. The invention of claim 13 wherein the slew control circuit is
completely independent of the other circuits of said systems.
15. The hydraulic system of claim 13 including dual-pressure relief
valve means having a first relief pressure when said translation
motor is operating, and having a second relief pressure when said
implement control motors are in operation.
16. The hydraulic system of claim 15 wherein said first range of
pilot control pressure is from 35 to 155 psi and said second range
of pilot control pressure is from 155 to 218 psi.
Description
BACKGROUND OF THE INVENTION
The present invention is directed to a hydraulic power and control
system and pertains more particularly to a hydraulic system for
powering the translation motor and the implement motors of a
hydraulic excavator.
Hydraulically operated material-handling machines such as backhoes
and hydraulic excavators have been known for some time. Such
machines are extremely versatile and hence widely used in building
and construction industries.
These machines normally utilize an internal combustion engine to
drive one or more pumps which supply pressurized fluid to operate
separate hydraulic motors for propelling the machine as well as
operating the material-handling implements. Considerable room
exists for improvement in the efficiency and safety of existing
prior art machines.
The prior art is exemplified by such U.S. Pat. Nos. as: 3,720,059
issued Mar. 3, 1973 to Schurawski et al; 3,428,647 issued Nov. 18,
1969 to Gerber et al; 3,476,274 issued Nov. 4, 1969 to W. J.
Witwer; 3,208,221 issued Sept. 28, 1965 to J. R. Schuetz; 3,172,552
issued Mar. 9, 1965 to R. Metailler; and 2,768,499 issued Oct. 30,
1956 to J. S. Pilch.
A number of foreign patents are as follows;
British: No. 1,044,851 dated Oct. 5, 1966 to Auxitra; 1,057,752
dated Feb. 8, 1967 to Ornstein-Koppel, and No. 1,108,232 dated Apr.
3, 1968 to Tractem.
French: No. 1,259 to De Venissiux, dated Mar. 13, 1961; No.
1,301,228 to Weitz, dated July 2, 1962; No. 1,343,512 to
Ornstein-Koppel dated Oct. 14, 1963, and No. 1,330,457 to Tevs,
dated May 13, 1903.
The problem of efficiency with such machines is the result of the
constant shifting between the various implement motors, the need
for simultaneous positive operation of a number of motors, and the
need for repetitive high-speed operation of one or more motors.
Such requirements impose unusual requirements on the construction
and arrangement of valves and circuits.
In order to obtain positive displacement of a motor, it must have a
fluid supply unaffected by the operation of another motor. This,
ideally, means a separate pump for each motor. Such an arrangement,
however, could be extremely expensive and would result in a
substantial waste of pump capacity during times when some of the
motors are not being used. This type arrangement having separate
pumps is disclosed in U.S. Pat. No. 3,172,552 issued Mar. 9, 1965
to R. Metailler.
In order to make maximum use of pump capacity, it is desirable to
combine pump flow to motors which can use the increased capacity,
while other motors are idle. In addition to making maximum
utilization of the pump capacity, this type arrangement results in
faster operation of certain machine functions. Such arrangements
not only increase the efficient use of the pump capacities, but
also speed operation of the particular machine function and thereby
increase the efficiency of overall material-handling operation.
When the vehicle is propelled by a hydraulic motor or motors, the
efficient use of the fluid capacity of the machine becomes quite
important. When the vehicle is mounted on crawler tracks, low-speed
power and maneuverability is of prime importance. When the vehicle
is mounted on rubber tires, low-speed control as well as
high-velocity translation are of prime importance. These different
systems require different means of controlling the fluid to the
translation motors.
One proposal to increase use of pump flow is to connect the
distributor valve inn parallel. This arrangement, however, has the
disadvantage of lack of positive control when two motors requiring
different pressures are simultaneously operated. If, for example,
one motor meets increased resistance, it will slow down or stop,
while the other motor with less resistance will speed up. Such a
parallel arrangement is disclosed in U.S. Pat. No. 3,208,221 issued
Sept. 28, 1965 to Schuetz; and U.S. Pat. No. 3,720,059 issued Mar.
3, 1973 to Schurawski et al.
Other proposals have included series-connected distributors with
the pumps combined upstream of a series of distributors. This
arrangement permits use of combined flow at a particular motor but
cuts off flow to downstream motors.
Still another proposal provides separate pumps and distributors
with means to divert flow from one pump to combine with the flow
from another for operation of one or more motors. Such an
arrangement leaves a portion of the hydraulic circuit inoperative,
and adds another control lever which the operator must consciously
manipulate in order to use the maximum power and speed of the
machine.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to overcome the
above problems of the prior art.
Another object of the present invention is to provide a more
efficient and versatile hydraulic control system for
material-handling machines and the like.
A further object of the present invention is to provide a hydraulic
control system that is arranged for more efficient utilization of
available fluid power than has heretofore been known.
Still another object of the present invention is to provide a
hydraulic system for powering hydraulic excavators that
automatically obtains the maximum efficient use of the hydraulic
power for propelling the vehicle and for movements of the
material-handling apparatus from the power available.
In accordance with the present invention, a hydraulic power and
control system for an excavator comprises a plurality of pumps
supplying fluid independently to separate series of distributor
valves. The distributors are arranged to supply fluid from the
pumps to selected fluid motors for powering the translation motor
and the implements of the apparatus. The distributors and motors
are arranged in an order of priority with means for combining pump
flow for operation of selected implement motors and in sequence for
operation of the translation motor.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects and advantages of the present invention
will become apparent to those of skill in the art from the
following description when read in conjunction with the
accompanying drawings wherein:
FIG. 1 is an elevational view of a hydraulic excavator
incorporating the present invention;
FIG. 2 is a schematic layout of a circuit incorporating a preferred
embodiment of the present invention;
FIG. 3 is a schematic layout of an alternate embodiment of the
present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Referring now to the drawings, with particular reference to FIG. 1,
there is illustrated a wheel-type hydraulic excavator generally
designated by the numeral 10 and comprising a body or undercarriage
12 supported on suitable rotatable front and rear wheels 14 and 16
respectively driven by a suitable hydraulic translation motor 18.
Outriggers 20 are secured to the front of the frame and extendable
by suitable hydraulic motors (not shown) into engagement with the
ground to stabilize the vehicle during operation. A suitable
rotatable platform 22 is supported for 360.degree. rotation from
the body or undercarriage 12 and includes an operator compartment
24 and an engine compartment 26. A boom 28 is pivotally mounted on
the rotatable platform 22 and manipulated about its pivotal point
by means of a pair of hydraulic motors 30. An arm or jib 32 is
pivotally carried by the boom 28 and pivotally carries on the end
thereof a bucket 34 with motors 36 and 38 operatively connected for
manipulating the arm and bucket respectively. Fluid for
manipulating and controlling these motors is supplied by a circuit
to be described below and pressurized by means of pumps driven by
an engine 40.
Referring now to FIG. 2, there is illustrated a preferred
embodiment of the present invention comprising a unique arrangement
of distributor valves and motor connections which provide for an
optimum utilization of system power and fluid flow. In accordance
with this preferred arrangement, the circuit comprises a pair of
large variable displacement pumps 42 and 44 controlled by suitable
horsepower controlling means (not shown) which is responsive to
govern the horsepower output of the pumps in conformance with the
output of the engine. The pumps 42 and 44 draw fluid from a tank or
reservoir 46 by way of line or conduit 48 and supply the fluid
under pressure by way of supply lines 50 or conduits 52 to
respective first and second series of distributor valves for
directing fluid to and controlling the various motors for carrying
out the functions of the machine.
The first variable displacement pump 42 supplies fluid to the first
series of valves comprising a first distributor valve 54 for
directing fluid to the translation motor 18, a second distributor
valve 56 for directing fluid to bucket motor 38, and a third
distributor valve 58 for directing fluid to the boom motors 30. The
fluid, after flowing through these open-centered valves without
diversion for operation of a motor, passes along return passage 60
through a cross-over valve 62 and to return passage or conduit 64
which leads to tank 46. This arrangement of distributors is an
interrupted series arrangement in that actuation of a distributor
interrupts the supply of fluid to the downstream distributors.
Thus, an upstream distributor is a preferred distributor taking
precedence over the downstream distributors.
The second variable displacement pump 44 supplies fluid along
conduit 52 to a first distributor valve 66 of the second series,
operative for directing fluid from that pump to translation motor
18, and then to a second distributor valve 68 for directing fluid
to the jib or stick motor 36. After flowing through the
above-described open-centered control valves, the fluid flows along
a return passageway or conduit 70 and through the open center of a
second cross-over valve 72 and into return passage 64. Means are
provided comprising the cross-over valves 62 and 72 and conduits
74, 76 for combining the fluid when not used from either of the
above series of valves with the fluid to the last distributor in
each of the other of the above series. This combining function is
accomplished by an interconnection of the valves so that the
cross-over valves operate with the respective distributor to which
the combined fluid is directed.
For example, cross-over valve 72 shifts automatically with
distributor valve 58, so that fluid in line 70 is directed across
valve 72 and by way of line 76 to the inlet side of valve 58. Thus
fluid from both pumps 42 and 44 may be supplied to distributor 58
which is operative to direct the fluid to the boom lift cylinders
30.
The cross-over valve 62 is operative to shift with distributor
valve 68, so that fluid from line 60 is directed across valve 62
and by way of line 74 to the inlet side of valve 68. The valve 72
may be made to shift as valve 68 is shifted in one or both
directions.
The circuit includes a third main supply pump 78 which is a
lower-volume pump than the previous pumps and may, for example, be
a suitable fixed displacement pump for supplying fluid by way of a
supply line 80 to distributor 82 for controlling the supply of
fluid to the slewing or platform rotation motor 84. This separate
slewing motor and circuit for the platform adds to the versatility
as well as safety of the machine. The versatility of the machine is
enhanced by the fact that fluid is available for rotating the
platform into position at the same time that the vehicle may be in
translation along the ground with the drive motor operating at full
speed from fluid supplied by both pumps 42 and 44. The safety of
the machine is enhanced by the fact that attempts to slew or swing
the platform while the vehicle is in translation cannot rob the
drive motor of fluid necessary to prevent the vehicle being thrown
into a sudden uncontrolled change of speed.
A pilot supply pump 86 supplies fluid for a pilot control circuit
by way of a line 88 for operation of pilot valves for controlling
or operating the main control valves as well as fluid for actuating
and releasing brakes for the slew and for the wheels.
The translation drive motor is powered by the separate variable
displacement pumps 42 and 44 in sequence for translatory movement
of the vehicle. More particularly, the first pump 42 supplies fluid
to the motor for low speed range up to the full capacity of that
pump, then the second pump 44 is automatically brought in for
higher speed range. Translatory movement of the vehicle is
accomplished by movement of pilot-operated directional control
valve 90 which directs fluid along either one of pilot lines 92 or
94 for shifting of motor control distributor valves 54 and 66.
Valve 54 is responsive to shift first for directing fluid along
motor control lines 96 or 98 to motor 18. Shifting of valve 66 for
directing fluid along either one of motor control lines 100 or 102
to drive motor 18 occurs after valve 54 has been almost fully
shifted to full open. The direction of drive of the vehicle will
depend on which direction the drive control valves 54 and 66 are
shifted. The control valves 54 and 66 are pilot-operated and are
shifted in either direction by means of a pilot directional valve
90 and the degree of shifting of the valves is controlled by a
pilot speed control valve 104. Pilot valve 90 controls direction of
the pilot signal and pilot valve 104 controls the strength of the
signal.
The drive system of the present circuit is arranged to provide a
low range and a high range operative from the same control such as
a foot pedal connected to operate the speed control valve 104. This
dual range is provided by an arrangement wherein the output from a
first pump is directed to the hydraulic drive motor for the low
speed range and the output from a second pump is added or combined
with that from the first pump for the high speed range.
This speed range is obtained by providing one of valves 54 and 66
with a fairly low pilot pressure shifting range and providing the
other valve with a higher pilot pressure shifting range. In the
preferred embodiment, valve 54 is set to operate over the range of
35 to 155 psi. That is, the valve begins shifting at 35 psi and
shifts over its range of movement up to 155 psi, the valve being
fully open at the 155 psi. This range of pilot pressures is
controlled by the valve 104 which is operative to modulate the
pressure over at least those ranges.
The pilot pressure for shifting of valve 66 begins at 145 psi and
ends at approximately 218 psi. In other words, this valve 66 shifts
over the range of 145 to 218 psi. This provides an overlap of
approximately 10 psi with the valve 54 to ensure a smooth
transition from the range of single pump 42 to the range of dual
pump 44. This shifting of the valves occurs automatically as the
foot pedal operating valve 104 is moved through its range of
movement.
Each of the distributor valves 54 and 56 has associated therewith
pressure-compensating flow-control valves 106 and 108 respectively.
These valves are provided in the exhaust line of each of the valves
and operate to prevent the motor 18 from overspeeding. This
overspeed is prevented by restricting the flow back to the return
line 64, which returns fluid back to the tank. The problem of
overspeed could occur when the excavator vehicle is traveling down
an incline or hill and the inertial force of the machine tends to
drive the propulsion motor faster than it would normally go.
Each of the motor control supply lines is also protected by relief
valve 110 and the motor itself is protected by a pair of
anticavitation valves 112 and 114.
The first translation motor distributor valve 54 is also provided
with restricted open communication means indicated generally at 116
in the form, for example, of a restricted passageway 116a or the
like communicating the motor control lines 96 and 98 with a return
line or passageway 118 which is in communication with the return
line 64. This communication means 116 is operative when the spool
54 is in the neutral position to communicate both lines 96 and 98
by way of suitable passages 116b and 116c with the restriction 116a
and return line 64. The function of this restricted communication
means 116 is of course to prevent locking of the motor 18 when the
valve 54 is returned to neutral position. Under normal conditions,
for example, the pressure relief valves 110 are set high enough to
cause an immediate braking and locking of the motor 18 when the
valve 54 is shifted to the neutral position as shown. Thus, if the
vehicle is in motion and the valve 54 is returned suddenly to the
neutral position, the wheels will lock and the vehicle will come to
a sudden stop. With the present arrangement, however, fluid is
permitted to pass to the return lines and the reservoir and thus
the vehicle will not come to an immediate and sudden stop when the
valve is shifted into neutral position.
The outriggers 20 shown in FIG. 1 are operated by a pair of
hydraulic motors 120 and 122 which are supplied by fluid from pump
44 downstream of the distributor valve 68 which supplies fluid to
the jib or stick. As can be seen from FIG. 1, fluid passing through
valve 66 passes along a passageway or conduit means 124 bypassing
distributor valve 82 and entering the inlet to supply fluid for
distributor valve 68. When valve 68 is in neutral position, the
fluid flows across the distributor valve 68 and along the
passageway 70, diverter valve 72 and if that valve is in neutral as
shown, the fluid passes along passageway or conduit means 126,
which branches to supply fluid simultaneously to a pair of
distributor valves 128 and 130, which are respectively operative to
supply fluid for operation of the outrigger motors 120 and 122. The
outrigger valves and motors are of course downstream of the
distributor valves 66 and 68 and thus do not affect the operation
of the motors 18 and 36 from the pump 44.
A valve indicated generally at 132 provides a dual pressure relief
setting for pumps 42 and 44.
As can be seen from FIG. 2, the output lines 50 and 52 from pumps
42 and 44 are communicated by way of suitable conduit means 134 and
a pair of check valves 136 and 138 with the dual pressure relief
valve 132. The dual pressure relief valve assembly 132 includes a
first relief valve 140 which is operative to unload at pressures in
excess of 4500 psi and communicate with the conduit means 134 and
the return line 142. A second relief valve 144 is in selective
communication by way of line 146 with this communication being
controlled by means of a selectively actuable valve 148 with the
output line 134. This valve 144 is responsive to a pressure level
lower than that of the first valve means 140 and on the order of
preferably approximately 4000 psi. The valve 144 is in selective
communication by means of a selector valve 148 which is operative
in response to operation of the speed control valve 104. As will be
appreciated, the pilot control signal from valve 104 is
communicated along conduit means 150 and communicates said signal
by means of a line 152 with the valve 148 to operate same by
shifting it to the locking position to the right of the position
shown.
When the implements of the vehicle are being actuated and the
vehicle itself is not being driven, low pressure valve 144 is in
communication, as shown, to provide a 4000 psi setting for the
system. During travel of the vehicle when speed control valve 104
is actuated, valve 148 is shifted to the right to the blocking
position, thus blocking flow to relief valve 144 and rendering it
inoperative. However, relief valve 140 is still in effect and by
being directly connected to the output line 134 of pumps 42 and 44
and to tank permits unloading of the drive motor 18 only at
pressures in excess of 4500 psi.
Turning now to FIG. 3, there is illustrated an alternate embodiment
wherein identical parts and identical arrangements are identified
by the same numeral. The primary distinction of this embodiment
over that of the FIG. 2 embodiment is that the outrigger motors 120
and 122 are supplied with fluid from the slewing pump 78. In this
embodiment, fluid supplied to valve 82 and not diverted thereby to
the operation of motor 84 passes therethrough and along a passage
or conduit means 154 where it is supplied to a pair of distributor
valves 156 and 158 which are operative respectively to supply fluid
to outrigger motors 120 and 122. This arrangement whereby the
outriggers are last in line for the fluid does not create any
problems since the outriggers are normally extended into place
before any operation of the implements is begun. Once the
outriggers are extended, they are left in place as long as
operation of the machine takes place.
While specific embodiments have been utilized to illustrate the
invention, it is to be understood that the invention is to be
limited only by the scope of the appended claims.
* * * * *