US3814265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic crane control system having means for deactivating control valves when operating limit is exceeded
Assignee: Harnischfeger Corp
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Filing: 1973-08-20
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Granted: 1974-06-04
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Expires: 1993-08-20
Abstract
Abstract A mobile crane has a plurality of components which are selectively movable to various positions by means of individual hydraulic actuators (such as hydraulic motors or hydraulic rams) in response to selective operation of control valves. The control valves are grouped in one or more valve banks and, preferably, each bank is supplied with fluid from its own engine-driven hydraulic pump. Diversion of fluid from within a certain section of each valve bank has the effect of rendering the control valves in the bank inoperative. The crane also includes a pilot pressure operated holding valve for the hydraulic boom hoist cylinders and closure of this valve (effected by diversion of the pilot fluid thereto) prevents further boom movement. Means are provided to prevent further movement or operation of all crane components in the event one component, such as the boom, is operated or about to be operated beyond specified operating limits. Such means comprises a weight-load device for sensing that boom operating limits are about to be exceeded and an electric relay responsive to the sensing device to operate solenoid valves which divert fluid from the aforementioned section of the valve bank and divert pilot pressure from the boom hoist cylinder holding valve, thereby preventing further operation of any crane component by means of operation of a control valve and locking the boom in whatever position it is in. Selectively operable override means are provided to bypass the sensing device and operate the solenoids as to enable operation of the control valves and permit selective movement of the crane components.
Inventors
- 👤 M Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:26
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; B; B66; B66C; B66C13/00; B66C13/18; E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/2203; B66C2700/00; B66C2700/06; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/20576; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/3053; F15B2211/30535; F15B2211/31; F15B2211/3122; F15B2211/40; F15B2211/405; F15B2211/40507; F15B2211/40546; F15B2211/42; F15B2211/428; F15B2211/45; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/515; F15B2211/5153; F15B2211/5155; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6054; F15B2211/65; F15B2211/67; F15B2211/70; F15B2211/705; F15B2211/7058; F15B2211/71; F15B2211/7114; F15B2211/7128; F15B2211/7142; F15B2211/715
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
255 words
In a hydraulic machine having a plurality of movable components, at least one of said components having an operating limit beyond which further operation is undesirable; a plurality of hydraulic actuators, at least one hydraulic actuator for operating each component; a control valve bank comprising a plurality of selectively operable control valves, at least one control valve being provided for operating each hydraulic actuator, pump means for supplying pressurized hydraulic fluid to said control valve bank for direction by each control valve to its respective actuator to effect operation of a respective component; dump valve means connected to said control valve bank and responsive to a pressure condition therein to divert fluid from said control valves and thereby prevent actuation thereof from effecting operation of said actuators and corresponding operation of said components; first valve means operable to affect pressure conditions in said control valve bank and thereby effect operation of said dump valve; a source of pilot pressure; holding valve means responsive to said pilot pressure for controlling locking operation of the hydraulic actuator for said one component; second valve means operable to affect the flow of pilot fluid to said holding valve means; and sensing means responsive to operation of said one component to said operating limit to operate said first valve means and effect operation of said dump valve thereby rendering actuation of said control valves ineffective and to operate said second valve means to cause said holding valve means to effect locking operation of said hydraulic actuator for said one component.
Claim 2
Dependent Claim
255 words
In a hydraulic machine having a plurality of movable components, at least one of said components having an operating limit beyond which further operation is undesirable; a plurality of hydraulic actuators, at least one hydraulic actuator for operating each component; a control valve bank comprising a plurality of selectively operable control valves, at least one control valve being provided for operating each hydraulic actuator, pump means for supplying pressurized hydraulic fluid to said control valve bank for direction by each control valve to its respective actuator to effect operation of a respective component; dump valve means connected to said control valve bank and responsive to a pressure condition therein to divert fluid from said control valves and thereby prevent actuation thereof from effecting operation of said actuators and corresponding operation of said components; first valve means operable to affect pressure conditions in said control valve bank and thereby effect operation of said dump valve; a source of pilot pressure; holding valve means responsive to said pilot pressure for controlling locking operation of the hydraulic actuator for said one component; second valve means operable to affect the flow of pilot fluid to said holding valve means; and sensing means responsive to operation of said one component to said operating limit to operate said first valve means and effect operation of said dump valve thereby rendering actuation of said control valves ineffective and to operate said second valve means to cause said holding valve means to effect locking operation of said hydraulic actuator for said one component.
Claim 3
Dependent Claim
33 words
A machine according to claim 1 wherein said first and second valve means each include a solenoid valve and wherein said sensing means includes electroresponsive means for effecting operation of the solenoid valves.
Claim 4
Dependent Claim
290 words
In a hydraulic machine having a plurality of movable components, at least one of said components having an operating limit beyond which further operation is undesirable; a plurality of hydraulic actuators, at least one hydraulic actuator for operating each component; a plurality of selectively operable control valves, at least one control valve being provided for operating each hydraulic actuator, said control valves being arranged in two separate control valve banks, two pumps for supplying pressurized hydraulic fluid to said control valve banks for direction by each control valve to its respective actuator to effect operation of a respective component, one pump being provided for each control valve bank, dump valves connected to said control valve banks, each dump valve being responsive to a pressure condition in its respective control valve bank to divert fluid from the control valves in that bank and thereby prevent actuation thereof from effecting operation of the associated actuators and corresponding operation of components operated by said associated actuators; first and second valve means operable to affect pressure conditions in said control valve banks and thereby effect operation of the dump valves therefor; a source of pilot pressure; holding valve means responsive to said pilot pressure for controlling locking operation of the hydraulic actuator for said one component; third valve means operable to affect the flow of pilot fluid to said holding valve means; and sensing means responsive to operation of said one component to said operating limit to operate said first and second valve means and effect operation of said dump Valves thereby rendering actuation of said control valves ineffective and to operate said third valve means to cause said holding valve means to effect locking operation of said hydraulic actuator for said one component.
Claim 5
Dependent Claim
290 words
In a hydraulic machine having a plurality of movable components, at least one of said components having an operating limit beyond which further operation is undesirable; a plurality of hydraulic actuators, at least one hydraulic actuator for operating each component; a plurality of selectively operable control valves, at least one control valve being provided for operating each hydraulic actuator, said control valves being arranged in two separate control valve banks, two pumps for supplying pressurized hydraulic fluid to said control valve banks for direction by each control valve to its respective actuator to effect operation of a respective component, one pump being provided for each control valve bank, dump valves connected to said control valve banks, each dump valve being responsive to a pressure condition in its respective control valve bank to divert fluid from the control valves in that bank and thereby prevent actuation thereof from effecting operation of the associated actuators and corresponding operation of components operated by said associated actuators; first and second valve means operable to affect pressure conditions in said control valve banks and thereby effect operation of the dump valves therefor; a source of pilot pressure; holding valve means responsive to said pilot pressure for controlling locking operation of the hydraulic actuator for said one component; third valve means operable to affect the flow of pilot fluid to said holding valve means; and sensing means responsive to operation of said one component to said operating limit to operate said first and second valve means and effect operation of said dump Valves thereby rendering actuation of said control valves ineffective and to operate said third valve means to cause said holding valve means to effect locking operation of said hydraulic actuator for said one component.
Claim 6
Dependent Claim
34 words
A machine according to claim 3 wherein said first, second and third valve means each include a solenoid valve and wherein said sensing means includes electroresponsive means for effecting operation of the solenoid valves.
Claim 7
Dependent Claim
263 words
In a hydraulic crane having a plurality of movable components including a boom, said boom having an operating limit beyond which further operation is undesirable; a plurality of hydraulic actuators, at least one hydraulic actuator for operating each component and including a boom hoist cylinder for said boom; a control valve bank comprising a plurality of selectively operable control valves, at least one control valve being provided for operating each hydraulic actuator, pump means for supplying pressurized hydraulic fluid to said control valve bank for direction by each control valve to its respective actuator to effect operation of a respective component; dump valve means connected to said control valve bank and responsive to a pressure condition therein to divert fluid from said control valves and thereby prevent actuation thereof from effecting operation of said actuators and corresponding operation of said components; first valve means operable to affect pressure conditions in said control valve bank and thereby effect operation of said dump valve; a source of pilot pressure; a boom hoist cylinder holding valve responsive to said pilot pressure for controlling locking operation of said boom hoist cylinder; second valve means operable to affect the flow of pilot fluid to said boom hoist cylinder holding valve; and sensing means responsive to operation of said boom to said operating limit to operate said first valve means and effect operation of said dump valve thereby rendering actuation of said control valves ineffective and to operate said second valve means to cause said boom hoist cylinder holding valve to effect locking operation of said boom hoist cylinder.
Claim 8
Dependent Claim
263 words
In a hydraulic crane having a plurality of movable components including a boom, said boom having an operating limit beyond which further operation is undesirable; a plurality of hydraulic actuators, at least one hydraulic actuator for operating each component and including a boom hoist cylinder for said boom; a control valve bank comprising a plurality of selectively operable control valves, at least one control valve being provided for operating each hydraulic actuator, pump means for supplying pressurized hydraulic fluid to said control valve bank for direction by each control valve to its respective actuator to effect operation of a respective component; dump valve means connected to said control valve bank and responsive to a pressure condition therein to divert fluid from said control valves and thereby prevent actuation thereof from effecting operation of said actuators and corresponding operation of said components; first valve means operable to affect pressure conditions in said control valve bank and thereby effect operation of said dump valve; a source of pilot pressure; a boom hoist cylinder holding valve responsive to said pilot pressure for controlling locking operation of said boom hoist cylinder; second valve means operable to affect the flow of pilot fluid to said boom hoist cylinder holding valve; and sensing means responsive to operation of said boom to said operating limit to operate said first valve means and effect operation of said dump valve thereby rendering actuation of said control valves ineffective and to operate said second valve means to cause said boom hoist cylinder holding valve to effect locking operation of said boom hoist cylinder.
Claim 9
Dependent Claim
33 words
A crane according to claim 5 wherein said first and second valve means each include a solenoid valve and wherein said sensing means includes electroresponsive means for effecting operation of the solenoid valves.
Claim 10
Dependent Claim
325 words
In a hydraulic crane having a plurality of movable components including a boom, said boom having an operating limit beyond which further operation is undesirable; a plurality of hydraulic actuators, at least one hydraulic actuator for operating each component and including a boom hoist cylinder for said boom; a plurality of selectively operable control valves, at least one control valve being provided for operating each hydraulic actuator, said control valves being arranged in two separate control valve banks, two pumps for supplying pressurized hydraulic fluid to said control valve banks for direction by each control valve to its respective actuator to effect operation of a respective component, one pump being provided for each control valve bank; dump valves connected to said control valve banks, each dump valve being responsive to a pressure condition in tis respective control valve bank to divert fluid from the control valves in that bank and thereby prevent actuation thereof from effecting operation of the associated actuators and corresponding operation of components operated by said associated actuators, first and second valve means operable to affect pressure conditions in said control valve banks and thereby effect operation of the dump valves therefor, each of said first and second valve means including a solenoid valve; a source of pilot pressure; a boom hoist cylinder holding valve responsive to said pilot pressure for controlling locking operation of the boom hoist cylinders for said boom; third valve means including a solenoid valve operable to affect the flow of pilot fluid to said boom hoist cylinder holding valve; and senSing means responsive to operation of said boom to said operating limit to operate the solenoid valve of said first and second valve means and effect operation of said dump valves thereby rendering actuation of said control valves ineffective and to operate the solenoid valve of said third valve means to cause said boom hoist cylinder holding valve to effect locking operation of said boom hoist cylinder.
Claim 11
Dependent Claim
325 words
In a hydraulic crane having a plurality of movable components including a boom, said boom having an operating limit beyond which further operation is undesirable; a plurality of hydraulic actuators, at least one hydraulic actuator for operating each component and including a boom hoist cylinder for said boom; a plurality of selectively operable control valves, at least one control valve being provided for operating each hydraulic actuator, said control valves being arranged in two separate control valve banks, two pumps for supplying pressurized hydraulic fluid to said control valve banks for direction by each control valve to its respective actuator to effect operation of a respective component, one pump being provided for each control valve bank; dump valves connected to said control valve banks, each dump valve being responsive to a pressure condition in tis respective control valve bank to divert fluid from the control valves in that bank and thereby prevent actuation thereof from effecting operation of the associated actuators and corresponding operation of components operated by said associated actuators, first and second valve means operable to affect pressure conditions in said control valve banks and thereby effect operation of the dump valves therefor, each of said first and second valve means including a solenoid valve; a source of pilot pressure; a boom hoist cylinder holding valve responsive to said pilot pressure for controlling locking operation of the boom hoist cylinders for said boom; third valve means including a solenoid valve operable to affect the flow of pilot fluid to said boom hoist cylinder holding valve; and senSing means responsive to operation of said boom to said operating limit to operate the solenoid valve of said first and second valve means and effect operation of said dump valves thereby rendering actuation of said control valves ineffective and to operate the solenoid valve of said third valve means to cause said boom hoist cylinder holding valve to effect locking operation of said boom hoist cylinder.
References Cited (Backward Citations)
US3371799A
Cited
US3690387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |