US3856152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Outrigger hydraulic system
Assignee: Bank of New England NA
•
Filing: 1973-12-03
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Granted: 1974-12-24
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Expires: 1993-12-03
Abstract
Abstract A hydraulic system for outriggers usable with mobile cranes and the like and for extending and retracting the horizontal extensible beam and the vertical jack cylinders with a beam extension cylinder having a beam extension line for supplying pressure fluid thereto and a beam return line for causing retraction of the extension cylinder and providing a flow connection to tank during extension of the cylinder, hydraulic means for directing pressure fluid to the jack cylinder to cause lowering of the jack and a second line connected to the jack cylinder and to the beam return line whereby said second jack cylinder line is either connected to tank or to pressure similarly to the beam retraction line and with the hydraulic means including a pilot-operated check valve functioning to retain the beam extension cylinder in an intermediate position or a retracted position. The pilot-operated check valve may be either directly in the beam return line with the check valve being piloted open either by pressure fluid supplied to the beam extension line or to the line supplying pressure fluid to the jack cylinder to lower the jack. Alternatively, the pilotoperated check valve is positionable in a line extending to a feed cylinder having a hollow piston rod through which flow passes to the jack cylinder for lowering of the jack and with such line functioning to hold the piston of the feed cylinder in a retracted or partially-extended position and, further, to support the hollow piston rod against buckling as pressure fluid is supplied therethrough and with the pilot-operated check valve being piloted open by supply of pressure fluid to the beam extension line. A master control circuit for a total of four jack cylinders and associated beam extension cylinders with the control valves for the various flow connections being associated on a plurality of valve spools to reduce the number of valve spools and flow lines required in a complete outrigger system for a mobile crane or the like.
Inventors
- 👤 J Parrett
- 👤 D Frazer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:44
CPC Classifications
F; F15; F15B; F15B3/00; B; B66; B66C; B66C23/00; B66C23/62; B66C23/72; B66C23/78; B66C23/80
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
207 words
A hydraulic system for an outrigger support having an extensible beam and a vertical jack cylinder at an end of the beam comprising: a hydraulic extension cylinder connectable to parts of the beam whereby extension of the rod of the extension cylinder extends said beam; a fluid circuit including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the other end of the extension cylinder and a first control valve for selectively connecting said lines to either pressure fluid or to tank; said jack cylinder having a pair of fluid lines for supplying pressure fluid to said jack cylinder for either raising or lowering the jack carried by said cylinder; fluid feed means connected to one of said jack cylinder fluid lines; a second control valve in the fluid circuit for directing pressure fluid to said fluid feed means to cause lowering of the jack; a fluid line connecting the other of the jack cylinder fluid lines to the beam return line; and hydraulic means including a pilot-operated check valve for holding said beam retracted or in an intermediate extended position with said check valve being piloted open by a pilot connection to said beam extension line.
Claim 2
Dependent Claim
207 words
A hydraulic system for an outrigger support having an extensible beam and a vertical jack cylinder at an end of the beam comprising: a hydraulic extension cylinder connectable to parts of the beam whereby extension of the rod of the extension cylinder extends said beam; a fluid circuit including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the other end of the extension cylinder and a first control valve for selectively connecting said lines to either pressure fluid or to tank; said jack cylinder having a pair of fluid lines for supplying pressure fluid to said jack cylinder for either raising or lowering the jack carried by said cylinder; fluid feed means connected to one of said jack cylinder fluid lines; a second control valve in the fluid circuit for directing pressure fluid to said fluid feed means to cause lowering of the jack; a fluid line connecting the other of the jack cylinder fluid lines to the beam return line; and hydraulic means including a pilot-operated check valve for holding said beam retracted or in an intermediate extended position with said check valve being piloted open by a pilot connection to said beam extension line.
Claim 3
Dependent Claim
71 words
A hydraulic system as defined in claim 1 wherein said check valve is in said beam return line between the first control valve and the fluid line extending from the jack cylinder fluid line and set to block flow to tank; and a second pilot connection to said pilot-operated check valve from said fluid feed means to open said beam return line to permit flow to tank from the jack cylinder.
Claim 4
Dependent Claim
74 words
A hydraulic system as defined in claim 1 wherein each of said jack cylinder fluid lines has a pilot-operated check valve for blocking flow away from the jack cylinder with each of said last-mentioned check valves being pilot-operated from the other of the jack cylinder fluid lines to permit induced flow from the jack cylinder; and said fluid feed means connected to one of the jack cylinder fluid lines is an extensible feed tuBe.
Claim 5
Dependent Claim
132 words
A hydraulic system as defined in claim 1 wherein there are four beam extension cylinders and four jack cylinders; a first valve spool having two valve sections incorporating the function of the first control valve in the fluid circuit for connecting pressure fluid to the extension cylinders to cause extension of the four beam extension cylinders; a second pair of valve spools having four valve sections incorporating the function of the first control valve in retracting the four beam extension cylinders; and a third pair of valve spools having four valve sections incorporating the function of the second control valve to lower the jacks; said second pair of valve spools having an open center connection to tank whereby flow from the jack cylinders as the jacks are lowered may flow to tank.
Claim 6
Dependent Claim
83 words
A hydraulic system for an outrigger support as defined in claim 1 wherein said fluid feed means includes an extensible fluid feed device including a feed cylinder and a hollow feed piston and piston rod movable therein; means connecting the feed piston to the rod of the extension cylinder; and said hydraulic means for holding said beam retracted or in an intermediate position includes a line from said feed cylinder to said beam return line and said pilot-operated check valve is interposed therebetween.
Claim 7
Dependent Claim
57 words
A hydraulic system as defined in claim 5 wherein said line from the feed cylinder connects into the feed cylinder at a location housing the hollow feed piston and piston rod whereby pressure is maintained on said piston rod to prevent buckling thereof when pressure fluid is supplied through the fluid feed means to lower the jack.
Claim 8
Dependent Claim
132 words
A hydraulic system as defined in claim 5 wherein there are four beam extension cylinders and four jack cylinders; a first valve spool having two valve sections incorporating the function of the first control valve in the fluid circuit for connecting pressure fluid to the extension cylinders to cause extension of the four beam extension cylinders; a second pair of valve spools having four valve sections incorporating the function of the first control valve in retracting the four beam extension cylinders; and a third pair of valve spools having four valve sections incorporating the function of the second control valve to lower the jacks; said second pair of valve spools having an open center connection to tank whereby flow from the jack cylinders as the jacks are lowered may flow to tank.
Claim 9
Dependent Claim
143 words
A hydraulic system for an outrigger support as defined in claim 1 wherein said beam extension cylinder is a two-stage unit including a movable cylinder within a cylinder to increase the ratio of extended length to closed length thereof; said fluid feed means includes an extensible fluid feed device including two-stage feed cylinder with a feed cylinder movable within a feed cylinder and a hollow feed piston and piston rod movable within the innermost feed cylinder and operably connected for movement with the rod of the extension cylinder; and said hydraulic means for holding said beam retracted or in an intermediate position includes a line from said two-stage feed cylinder to said beam return line and said pilot-operated check valve is interposed therebetween, said last-mentioned line acting to block flow out of said two-stage feed cylinder except when said check valve is open.
Claim 10
Dependent Claim
65 words
A hydraulic system as defined in claim 8 wherein said line from the two-stage feed cylinder connects into the outer cylinder of feed cylinder at a location to maintain pressure around the inner cylinder; and means defining a flow connection within said two-stage feed cylinder to further maintain pressure around the hollow feed piston rod when pressure fluid is supplied therethrough to lower the jack.
Claim 11
Dependent Claim
242 words
A hydraulic system for an outrigger support having an extensible beam and a vertical jack cylinder at an end of the beam comprising: a hydraulic extension cylinder connectable to parts of the beam whereby extension of the rod of the extension cylinder extends said beam; a fluid circuit including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the other end of the extension cylinder and a first control valve for selectively connecting said lines to either pressure fluid or to tank; said jack cylinder having a pair of fluid lines for supplying pressure fluid to said jack cylinder for either raising or lowering the jack carried by said cylinder; an extensible fluid feed means mechanically connected to the rod of the extension cylinder and flow connected to one of said jack cylinder fluid lines; a second control valve in the fluid circuit for directing pressure fluid to said fluid feed means to cause lowering of the jack; a fluid line connecting the other of the jack cylinder fluid lines to the beam return line; a pilot-operated check valve in said beam return line for hydraulically holding said rod and beam retracted or in an intermediate extended position; a first pilot connection from the beam extension line for opening said check valve; and a second pilot connection from the fluid means for opening said check valve when said jack is being lowered.
Claim 12
Dependent Claim
242 words
A hydraulic system for an outrigger support having an extensible beam and a vertical jack cylinder at an end of the beam comprising: a hydraulic extension cylinder connectable to parts of the beam whereby extension of the rod of the extension cylinder extends said beam; a fluid circuit including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the other end of the extension cylinder and a first control valve for selectively connecting said lines to either pressure fluid or to tank; said jack cylinder having a pair of fluid lines for supplying pressure fluid to said jack cylinder for either raising or lowering the jack carried by said cylinder; an extensible fluid feed means mechanically connected to the rod of the extension cylinder and flow connected to one of said jack cylinder fluid lines; a second control valve in the fluid circuit for directing pressure fluid to said fluid feed means to cause lowering of the jack; a fluid line connecting the other of the jack cylinder fluid lines to the beam return line; a pilot-operated check valve in said beam return line for hydraulically holding said rod and beam retracted or in an intermediate extended position; a first pilot connection from the beam extension line for opening said check valve; and a second pilot connection from the fluid means for opening said check valve when said jack is being lowered.
Claim 13
Dependent Claim
70 words
A hydraulic system as defined in claim 10 wherein said beam extension cylinder and extensible fluid means including a telescopic tube structure are mounted to a common base, said base mounting said pilot-operated check valve; and a pair of in-line pilot members in communication with the first and second pilot connections respectively to effect opening of the check valve when pressure fluid is applied to either of said pilot members.
Claim 14
Dependent Claim
55 words
A hydraulic system as defined in claim 10 wherein each of said jack cylinder fluid lines has a pilot-operated check valve for blocking flow away from the jack cylinder with each of said last-mentioned check valves being pilot-operated from the other of the jack cylinder fluid lines to permit induced flow from the jack cylinder.
Claim 15
Dependent Claim
267 words
A hydraulic system for an outrigger support having an extensible bean and a vertical jack cylinder at an end of the beam comprising: a hydraulic extension cylinder connectable to parts of the beam whereby extension of the rod of the extension cylinder extends said beam; a fluid circuit including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the other end of the extension cylinder and a first control valve for selectively connecting said lines to either pressure fluid or to tank; said jack cylinder having a pair of fluid lines for supplying pressure fluid to said jack cylinder for either raising or lowering the jack carried by said cylinder; fluid feed means connected to one of said jack cylinder fluid lines; a second control valve in the fluid circuit for directing pressure fluid to said fluid feed means to cause lowering of the jack; a fluid line connecting the other of the jack cylinder fluid lines to the beam return line; said fluid feed means includes a feed cylinder with a hollow piston rod and a flow communicating passage through the piston with the piston rod operably connected for movement with the beam; a line connected to said feed cylinder and to the space therein surrounding the hollow piston rod and extending to said beam return line; a pilot-operated check valve in said last-mentioned line to block flow to said beam return line; and a pilot connection to said check valve to open said check valve when pressure fluid is supplied to said beam extension line.
Claim 16
Dependent Claim
267 words
A hydraulic system for an outrigger support having an extensible bean and a vertical jack cylinder at an end of the beam comprising: a hydraulic extension cylinder connectable to parts of the beam whereby extension of the rod of the extension cylinder extends said beam; a fluid circuit including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the other end of the extension cylinder and a first control valve for selectively connecting said lines to either pressure fluid or to tank; said jack cylinder having a pair of fluid lines for supplying pressure fluid to said jack cylinder for either raising or lowering the jack carried by said cylinder; fluid feed means connected to one of said jack cylinder fluid lines; a second control valve in the fluid circuit for directing pressure fluid to said fluid feed means to cause lowering of the jack; a fluid line connecting the other of the jack cylinder fluid lines to the beam return line; said fluid feed means includes a feed cylinder with a hollow piston rod and a flow communicating passage through the piston with the piston rod operably connected for movement with the beam; a line connected to said feed cylinder and to the space therein surrounding the hollow piston rod and extending to said beam return line; a pilot-operated check valve in said last-mentioned line to block flow to said beam return line; and a pilot connection to said check valve to open said check valve when pressure fluid is supplied to said beam extension line.
Claim 17
Dependent Claim
55 words
A hydraulic system as defined in claim 13 wherein each of said jack cylinder fluid lines has a pilot-operated check valve for blocking flow away from the jack cylinder with each of said last-mentioned check valves being pilot-operated from the other of the jack cylinder fluid lines to permit induced flow from the jack cylinder.
Claim 18
Dependent Claim
131 words
A hydraulic system as defined in claim 13 wherein there are four beam extension cylinders and four jack cylinders; a first valve spool having two valve sections incorporating the function of the first controL valve in the fluid circuit for connecting pressure fluid to the extension cylinders to cause extension of the four beam extension cylinders; a second pair of valve spools having four valve sections incorporating the function of the first control valve in retracting the four beam extension cylinders; and a third pair of valve spools having four valve sections incorporating the function of the second control valve to lower the jacks; said second pair of valve spools having an open-center connection to tank whereby flow from the jack cylinders as the jacks are lowered may flow to tank.
Claim 19
Dependent Claim
109 words
A hydraulic system as defined in claim 13 wherein said beam extension cylinder is a two-stage unit including a cylinder within a cylinder to increase the ratio of extended length to closed length thereof; and said feed cylinder including a movable cylinder therein and spaced therefrom which movably carries said hollow piston rod and flow communicating piston; and said line which connects from the feed cylinder to said beam return line being in fluid communication with a space surrounding said movable cylinder as well as the space surrounding said hollow piston rod to prevent buckling thereof when pressure fluid is supplied to the jack cylinder to lower the jack.
Claim 20
Dependent Claim
55 words
A hydraulic system as defined in claim 16 wherein each of said jack cylinder fluid lines has a pilot-operated check valve for blocking flow away from the jack cylinder with each of said last-mentioned check valves being pilot-operated from the other of the jack cylinder fluid lines to permit induced flow from the jack cylinder.
Claim 21
Dependent Claim
131 words
A hydraulic system as defined in claim 17 wherein there are four beam extension cylinders and four jack cylinders; a first valve spool having two valve sections incorporating the function of the first control valve in the fluid circuit for connecting pressure fluid to the extension cylinders to cause extension of the four beam extension cylinders; a second pair of valve spools having four valve sections incorporating the function of the first control valve in retracting the four beam extension cylinders; and a third pair of valve spools having four valve sections incorporating the function of the second control valve to lower the jacks; said second pair of valve spools having an open-center connection to tank whereby flow from the jack cylinders as the jacks are lowered may flow to tank.
Claim 22
Dependent Claim
297 words
A hydraulic system for a plurality of outrigger supports for a mobile crane or the like and each support having a vertical jack cylinder with a movable jack and an extensible beam carrying the jack cylinder comprising: hydraulic means associated with each outrigger support including an extension cylinder for positioning the beam and a plurality of fluid lines including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the opposite end of the extension cylinder and a pair of fluid lines connected to the opposite ends of the jack cylinder, said fluid lines connected to the jack cylinder each having a pilot-operated check valve preventing flow therethrough to a tank but piloted by pressure in the opposite fluid line to the jack cylinder for movement to an open position permitting flow to tank; hydraulic control circuit means connected to the aforesaid fluid lines including a control valve operated to extend or retract the beams at one side of the mobile crane, a control valve for directing pressure fluid to the upper end of a jack cylinder to extend the jack therefrom, and a third control valve operable to supply pressure fluid to the beam return line to retract the extension cylinder; said fluid line connected to the lower end of the jack cylinder for retracting the jack into the jack cylinder being connected to said beam return line whereby operation of said third control valve addtionally causes retraction of said jack; and a pilot-operated check valve positioned in said control circuit functioning to hold said extensible beam retracted or in an inTermediate position and pilot-operated by pressure fluid supplied to the beam extension line to open and permit flow to tank as said extension cylinder is extended.
Claim 23
Dependent Claim
297 words
A hydraulic system for a plurality of outrigger supports for a mobile crane or the like and each support having a vertical jack cylinder with a movable jack and an extensible beam carrying the jack cylinder comprising: hydraulic means associated with each outrigger support including an extension cylinder for positioning the beam and a plurality of fluid lines including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the opposite end of the extension cylinder and a pair of fluid lines connected to the opposite ends of the jack cylinder, said fluid lines connected to the jack cylinder each having a pilot-operated check valve preventing flow therethrough to a tank but piloted by pressure in the opposite fluid line to the jack cylinder for movement to an open position permitting flow to tank; hydraulic control circuit means connected to the aforesaid fluid lines including a control valve operated to extend or retract the beams at one side of the mobile crane, a control valve for directing pressure fluid to the upper end of a jack cylinder to extend the jack therefrom, and a third control valve operable to supply pressure fluid to the beam return line to retract the extension cylinder; said fluid line connected to the lower end of the jack cylinder for retracting the jack into the jack cylinder being connected to said beam return line whereby operation of said third control valve addtionally causes retraction of said jack; and a pilot-operated check valve positioned in said control circuit functioning to hold said extensible beam retracted or in an inTermediate position and pilot-operated by pressure fluid supplied to the beam extension line to open and permit flow to tank as said extension cylinder is extended.
Claim 24
Dependent Claim
71 words
A hydraulic system as defined in claim 19 wherein said pilot-operated check valve in the control circuit is positioned in the beam return line; and an additional pilot connection to said last-mentioned pilot-operated check valve for opening said check valve when pressure fluid is directed to the jack cylinder to extend the jack from the jack cylinder whereby fluid may flow from the opposite end of the jack cylinder to tank.
Claim 25
Dependent Claim
139 words
A hydraulic system as defined in claim 19 wherein the fluid line of the hydraulic means for supplying pressure fluid to the jack cylinder to extend the jack from the jack cylinder includes an extendable feed tube having a cylinder with a hollow piston and piston rod therein and with the piston rod spaced from the cylinder; a line connected to said last-mentioned cylinder and the space surrounding said hollow piston rod and extending to the beam return line; and said pilot-operated check valve in the control circuit being positioned in said line extending to the beam return line whereby fluid is held in said line acting against said piston in the cylinder to prevent further extension of the beam and to exert forces on the hollow piston rod during supply of pressure fluid therethrough to prevent buckling thereof.
Claim 26
Dependent Claim
201 words
A hydraulic system for an outrigger support having an extensible beam and a vertical jack cylinder at an end of the beam comprising: a hydraulic extension cylinder connectable to parts of the beam whereby extension of the rod of the extension cylinder extends said beam; a fluid circuit including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the other end of the extension cylinder and a first control valve for selectively connecting said lines to either pressure fluid or to tank; said jack cylinder having a pair of fluid lines for supplying pressure fluid to said jack cylinder for either raising or lowering the jack carried by said cylinder; fluid feed means connected to one of said jack cylinder fluid lines; a second control valve in the fluid circuit for directing pressure fluid to said fluid feed means to cause lowering of the jack; and a fluid line connecting the other of the jack cylinder fluid lines to the beam return line whereby actuation of said first control valve to deliver pressure fluid to said beam return line will initiate lifting of said jack and then retraction of said beam.
Claim 27
Dependent Claim
201 words
A hydraulic system for an outrigger support having an extensible beam and a vertical jack cylinder at an end of the beam comprising: a hydraulic extension cylinder connectable to parts of the beam whereby extension of the rod of the extension cylinder extends said beam; a fluid circuit including a beam extension line connected to one end of the extension cylinder and a beam return line connected to the other end of the extension cylinder and a first control valve for selectively connecting said lines to either pressure fluid or to tank; said jack cylinder having a pair of fluid lines for supplying pressure fluid to said jack cylinder for either raising or lowering the jack carried by said cylinder; fluid feed means connected to one of said jack cylinder fluid lines; a second control valve in the fluid circuit for directing pressure fluid to said fluid feed means to cause lowering of the jack; and a fluid line connecting the other of the jack cylinder fluid lines to the beam return line whereby actuation of said first control valve to deliver pressure fluid to said beam return line will initiate lifting of said jack and then retraction of said beam.
Claim 28
Dependent Claim
55 words
A hydraulic system as defined in claim 22 wherein each of said jack cylinder fluid lines has a pilot-operated check valve for blocking flow away from the jack cylinder with each of said last-mentioned check valves being pilot-operated from the other of the jack cylinder fluid lines to permit induced flow from the jack cylinder.
Claim 29
Dependent Claim
132 words
A hydraulic system as defined in claim 22 wherein there are four beam extension cylinders and four jack cylinders; a first valve spool having two valve sections incorporating the function of the first control valve in the fluid circuit for connecting pressure fluid to the extension cylinders to cause extension of the four beam extension cylinders; a second pair of valve spools having four valve sections incorporating the function of the first control valve in retracting the four beam extension cylinders; and a third pair of valve spools having four valve sections incorporating the function of the second control valve to lower the jacks; said second pair of valve spools having an open center connection to tank whereby flow from the jack cylinders as the jacks are lowered may flow to tank.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |