US3610433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically operable extendable boom
Assignee: BAKER EQUIPMENT ENG CO
•
Filing: 1970-05-07
•
Granted: 1971-10-05
•
Expires: 1990-05-07
Abstract
Abstract An extendable boom formed of three telescopically received boom sections with a pair of hydraulic piston and cylinder assemblies in side-by-side relationship on the boom interior with one cylinder being axially movable with respect to the other form retracted to extended position for extending the boom and with the piston of one cylinder being connected to the inner end of the inner boom section and the cylinder of the same assembly being connected to the inner end of the middle boom section with the piston of the second hydraulic assembly being connected to the middle section and with the cylinder of the second assembly being connected to the outer boom section.
Inventors
- 👤 Edwin E Milner Jr
- 👤 William R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:28
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/705; B66C13/00; B66C13/18; B66C2700/00; B66C2700/06; B66C2700/062; B66C2700/065
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
281 words
An extendable boom system comprising an inner boom section connected adjacent one end to a horizontal support pivot means for pivotal movement in a vertical plane, a hollow middle boom section telescopically received within and axially movable with respect to said inner boom section, a hollow outer boom section telescopically received within said middle boom section and axially movable with respect to said middle boom section, first and second hydraulic piston and cylinder assemblies mounted on the interior of said boom, said first piston and cylinder assembly comprising a first cylinder having a first axially reciprocal internal piston and a first piston rod extending from one end of said first cylinder, said second piston and cylinder assembly comprising a second cylinder having a second axially reciprocal internal piston and a second piston rod extending from one end of said second cylinder, means connecting said first piston rod to a point adjacent that innermost end of said inner boom section, means connecting said first cylinder to a point adjacent the innermost end of said middle boom section whereby actuation of said first hydraulic piston and cylinder assembly to extend said first hydraulic piston and cylinder assembly serves to move said middle boom section outwardly with respect to said inner boom section, means connecting said second piston to the inner end of said middle boom section, means connecting said second cylinder to the inner end of said outer boom section, whereby extension of said second hydraulic piston and cylinder assembly serves to move said outer boom section and hydraulic control means for selectively providing pressurized hydraulic fluid to said first and second hydraulic piston and cylinder assemblies for extending and retracting said boom.
Claim 2
Dependent Claim
281 words
An extendable boom system comprising an inner boom section connected adjacent one end to a horizontal support pivot means for pivotal movement in a vertical plane, a hollow middle boom section telescopically received within and axially movable with respect to said inner boom section, a hollow outer boom section telescopically received within said middle boom section and axially movable with respect to said middle boom section, first and second hydraulic piston and cylinder assemblies mounted on the interior of said boom, said first piston and cylinder assembly comprising a first cylinder having a first axially reciprocal internal piston and a first piston rod extending from one end of said first cylinder, said second piston and cylinder assembly comprising a second cylinder having a second axially reciprocal internal piston and a second piston rod extending from one end of said second cylinder, means connecting said first piston rod to a point adjacent that innermost end of said inner boom section, means connecting said first cylinder to a point adjacent the innermost end of said middle boom section whereby actuation of said first hydraulic piston and cylinder assembly to extend said first hydraulic piston and cylinder assembly serves to move said middle boom section outwardly with respect to said inner boom section, means connecting said second piston to the inner end of said middle boom section, means connecting said second cylinder to the inner end of said outer boom section, whereby extension of said second hydraulic piston and cylinder assembly serves to move said outer boom section and hydraulic control means for selectively providing pressurized hydraulic fluid to said first and second hydraulic piston and cylinder assemblies for extending and retracting said boom.
Claim 3
Dependent Claim
23 words
The invention of claim 1 wherein said inner boom section, said middle section and said outer boom section are of rectangular cross-sectional configuration.
Claim 4
Dependent Claim
56 words
The invention of claim 2 additionally including slide block low-friction bearing means fixedly connected to the outer end of said first cylinder, and in sliding engagement with the exterior of said second cylinder for enabling relative movement of said cylinders with respect to each other with a minimum of friction and with maximum lateral positional stability.
Claim 5
Dependent Claim
113 words
The invention of claim 3 wherein said first piston rod includes a first internal rod passageway extending axially along the piston rod from the outer end of the piston rod externally of the first cylinder to a radial passageway communicating with the interior of the first cylinder on the rod side of the first cylinder interior and a second internal rod passageway extending the entire length of said first piston rod through said first piston to provide communication from the extreme outer end of said first piston rod externally of the first cylinder and that internal portion of the first cylinder on the side of said first piston opposite said first piston rod.
Claim 6
Dependent Claim
33 words
The invention of claim 4 additionally including low-friction cylindrical Teflon bearings between adjacent portions of said axially reciprocal boom sections for enabling low-friction movement of said boom sections between extended and retracted poSitions.
Claim 7
Dependent Claim
121 words
The invention of claim 4 wherein said second piston rod is provided with a first internal rod passageway extending axially along said second piston rod from the outer end of the second piston rod externally of the second cylinder to a radial passageway adjacent the second piston communicating with the interior of the second cylinder on the rod side of the cylinder interior and a second internal rod passageway extending the entire length of said second piston rod and through said second piston to provide communication between the extreme outer end of said second piston rod externally of said second cylinder and the portion of said second cylinder interior on the side of said second piston opposite said second piston rod.
Claim 8
Dependent Claim
214 words
The invention of claim 6 wherein said hydraulic control means includes a main cylinder connecting hydraulic line connected to the first cylinder on the rod end for communication with the portion of the interior of said first cylinder adjacent the piston rod end of said first cylinder and connected on its other end to a selectively operable directional control valve, a first second cylinder hydraulic power line extending between said directional control valve and the external rod end of said first internal rod passageway in said second piston rod, a second second cylinder hydraulic power line extending between said directional control valve and the external rod end of said second internal rod passageway in said second piston rod and an exhaust line extending between said directional control valve and the end of said first cylinder opposite the end of said first cylinder from which said first piston rod extends wherein said directional control valve is selectively operable to connect either of said second cylinder hydraulic power lines to said main cylinder connecting line while the other hydraulic power line is connected to said exhaust line and wherein said directional control valve is positionable in another position to simultaneously block said second cylinder hydraulic power lines to hold said second cylinder in a fixed position.
Claim 9
Dependent Claim
38 words
The invention of claim 7 wherein said hydraulic control means additionally includes first and second main hydraulic power inlet lines connected to said external ends of said first and second internal rod passageways of said first piston rod.
Claim 10
Dependent Claim
117 words
The invention of claim 8 wherein said directional control valve is a pilot signal operated spring centered piston valve and additionally including first and second pilot pressure lines extending from an operator controlled selectively operable valve for selectively connecting one of said pilot pressure lines to a source of pressure while the other is connected to an exhaust line or for connecting both of said pilot pressure lines simultaneously in fluid communication with each other so that said directional control valve assumes a spring biased blocking position in which said first second cylinder hydraulic power line and said second second cylinder hydraulic power line are blocked to hold said second piston and cylinder assembly in fixed position.
Claim 11
Dependent Claim
38 words
The invention of claim 8 wherein said first and second hydraulic power inlet lines are selectively connectable to a source of hydraulic pressure or to an exhaust sump through a four-way three-position master valve operable by the operator.
Claim 12
Dependent Claim
59 words
The invention of claim 8 wherein said first and second main hydraulic power inlet lines each include a selectively operable valve for connecting said line to a source of hydraulic pressure or to an exhaust with each of said valves selectively operable to connect both of said main hydraulic power inlet lines simultaneously to said source of hydraulic pressure.
Claim 13
Dependent Claim
56 words
The invention of claim 1 additionally including slide block low-friction bearing means fixedly connected to the outer end of said first cylinder and in sliding engagement with the exterior of said second cylinder for enabling relative movement of said cylinders with respect to each other with a minimum of Friction and with maximum lateral positional stability.
Claim 14
Dependent Claim
113 words
The invention of claim 12 wherein said first piston rod includes a first internal rod passageway extending axially along the piston rod from the outer end of the piston rod externally of the first cylinder to a radial passageway communicating with the interior of the first cylinder on the rod side of the first cylinder interior and a second internal rod passageway extending the entire length of said first piston rod through said first piston to provide communication from the extreme outer end of said first piston rod externally of the first cylinder and that internal portion of the first cylinder on the side of said first piston opposite said first piston rod.
Claim 15
Dependent Claim
121 words
The invention of claim 13 wherein said second piston rod is provided with a first internal rod passageway extending axially along said second piston rod from the outer end of the second piston rod externally of the second cylinder to a radial passageway adjacent the second piston communicating with the interior of the second cylinder on the rod side of the cylinder interior and a second internal rod passageway extending the entire length of said second piston rod and through said second piston to provide communication between the extreme outer end of said second piston rod externally of said second cylinder and the portion of said second cylinder interior on the side of said second piston opposite said second piston rod.
Claim 16
Dependent Claim
214 words
The invention of claim 14 wherein said hydraulic control means includes a main cylinder connecting hydraulic line connected to the first cylinder on the rod end for communication with the portion of the interior of said first cylinder adjacent the piston rod end of said first cylinder and connected on its other end to a selectively operable directional control valve, a first second cylinder hydraulic power line extending between said directional control valve and the external rod end of said first internal rod passageway in said second piston rod, a second second cylinder hydraulic power line extending between said directional control valve and the external rod end of said second internal rod passageway in said second piston rod and an exhaust line extending between said directional control valve and the end of said first cylinder opposite the end of said first cylinder from which said first piston rod extends wherein said directional control valve is selectively operable to connect either of said second cylinder hydraulic power lines to said main cylinder connecting line while the other hydraulic power line is connected to said exhaust line and wherein said directional control valve is positionable in another position to simultaneously block said second cylinder hydraulic power lines to hold said second cylinder in a fixed position.
Claim 17
Dependent Claim
38 words
The invention of claim 15 wherein said hydraulic control means additionally includes first and second main hydraulic power inlet lines connected to said external ends of said first and second internal rod passageways of said first piston rod.
Claim 18
Dependent Claim
117 words
The invention of claim 16 wherein said directional control valve is a pilot signal operated spring centered piston valve and additionally including first and second pilot pressure lines extending from an operator controlled selectively operable valve for selectively connecting one of said pilot pressure lines to a source of pressure while the other is connected to an exhaust line or for connecting both of said pilot pressure lines simultaneously in fluid communication with each other so that said directional control valve assumes a spring biased blocking position in which said first second cylinder hydraulic power line and said second second cylinder hydraulic power line are blocked to hold said second piston and cylinder assembly in fixed position.
Claim 19
Dependent Claim
38 words
The invention of claim 17 wherein said first and second hydraulic power inlet lines are selectively connectable to a source of hydraulic pressure or to an exhaust sump through a four-way three-positiOn master valve operable by the operator.
Claim 20
Dependent Claim
70 words
The invention of claim 18 wherein said first and second main hydraulic power inlet lines each include a selectively operable valve for connecting said line to a source of hydraulic pressure or to an exhaust with each of said valves in said first and second main hydraulic power inlet lines being selectively operable to connect both of said main hydraulic power inlet lines simultaneously to said source of hydraulic pressure.
Claim 21
Dependent Claim
17 words
The invention of claim 9 wherein said first and second pilot pressure lines are flexible hose members.
Claim 22
Dependent Claim
22 words
The invention of claim 20 wherein said directional control valve is fixedly connected to said middle boom on the innermost end thereof.
Claim 23
Dependent Claim
38 words
The invention of claim 21 wherein said first and second hydraulic power inlet lines are selectively connectable to a source of hydraulic pressure or to an exhaust sump through a four-way three-position master valve operable by the operator.
Claim 24
Dependent Claim
70 words
The invention of claim 22 wherein said first and second main hydraulic power inlet lines each include a selectively operable valve for connecting said lines to a source of hydraulic pressure or to an exhaust with each of said valves in said first and second main hydraulic power inlet lines being selectively operable to connect both of said main hydraulic power inlet lines simultaneously to said source of hydraulic pressure.
Claim 25
Dependent Claim
233 words
An extendable boom comprising an inner boom section, a hollow middle boom section and a hollow outer boom section with the hollow outer boom section being telescopically received within said middle boom section which is telescopically received within said inner boom section when said boom is in a contracted condition, a first hydraulic cylinder containing a first piston and having a first piston rod extending from one end thereof, a second hydraulic cylinder containing a second piston and having a second piston rod extending from one end of said second cylinder, said first and second hydraulic cylinders being positioned adjacent each other in side-by-side relationship when said boom is in its retracted position, means connecting said first piston rod to the innermost end of said inner boom, means connecting the innermost end of said first cylinder to the innermost end of said second boom, means connecting the end of said second piston rod to the innermost end of said second boom, means connecting the innermost end of said second cylinder to said outer boom section, hydraulic control means for providing pressurized hydraulic fluid for extending both of said cylinders to extend said boom to an extended position and slide bearing means connecting said first and second cylinders for permitting relative axial movement of said cylinders with respect to each other while retaining lateral stability between said cylinders during the extension of said boom.
Claim 26
Dependent Claim
233 words
An extendable boom comprising an inner boom section, a hollow middle boom section and a hollow outer boom section with the hollow outer boom section being telescopically received within said middle boom section which is telescopically received within said inner boom section when said boom is in a contracted condition, a first hydraulic cylinder containing a first piston and having a first piston rod extending from one end thereof, a second hydraulic cylinder containing a second piston and having a second piston rod extending from one end of said second cylinder, said first and second hydraulic cylinders being positioned adjacent each other in side-by-side relationship when said boom is in its retracted position, means connecting said first piston rod to the innermost end of said inner boom, means connecting the innermost end of said first cylinder to the innermost end of said second boom, means connecting the end of said second piston rod to the innermost end of said second boom, means connecting the innermost end of said second cylinder to said outer boom section, hydraulic control means for providing pressurized hydraulic fluid for extending both of said cylinders to extend said boom to an extended position and slide bearing means connecting said first and second cylinders for permitting relative axial movement of said cylinders with respect to each other while retaining lateral stability between said cylinders during the extension of said boom.
Claim 27
Dependent Claim
113 words
The invention of claim 24 wherein said first piston rod includes a first internal rod passageway extending axially along the piston rod from the outer end of the piston rod externally of the first cylinder to a radial passageway communicating with the interior of the first cylinder on the rod side of the first cylinder interior and a second internal rod passageway extending the entire length of said first piston rod through said first piston to provide communication from the extreme outer end of said first piston rod externally of the first cylinder and that internal portion of the first cylinder on the side of said first piston opposite said first piston rod.
Claim 28
Dependent Claim
121 words
The invention of claim 25 wherein said second piston rod is provided with a first internal rod passageway extending axially along said second piston rod from the outer end of the second piston rod externally of the second cylinder to a radial passageway adjacent the second piston communicating with the interior of the second cylinder on the rod side of the cylinder interior and a second internal rod passageway extending the entire length of said second piston rod and thrOugh said second piston to provide communication between the extreme outer end of said second piston rod externally of said second cylinder and the portion of said second cylinder interior on the side of said second piston opposite said second piston rod.
Claim 29
Dependent Claim
214 words
The invention of claim 26 wherein said hydraulic control means includes a main cylinder connecting hydraulic line connected to the first cylinder on the rod end for communication with the portion of the interior of said first cylinder adjacent the piston rod end of said first cylinder and connected on its other end to a selectively operable directional control valve, a first second cylinder hydraulic power line extending between said directional control valve and the external rod end of said first internal rod passageway in said second piston rod, a second second cylinder hydraulic power line extending between said directional control valve and the external rod end of said second internal rod passageway in said second piston rod and an exhaust line extending between said directional control valve and the end of said first cylinder opposite the end of said first cylinder from which said first piston rod extends wherein said directional control valve is selectively operable to connect either of said second cylinder hydraulic power lines to said main cylinder connecting line while the other hydraulic power line is connected to said exhaust line and wherein said directional control valve is positionable in another position to simultaneously block said second cylinder hydraulic power lines to hold said second cylinder in a fixed position.
Claim 30
Dependent Claim
38 words
The invention of claim 27 wherein said hydraulic control means additionally includes first and second main hydraulic power inlet lines connected to said external ends of said first and second internal rod passageways of said first piston rod.
Claim 31
Dependent Claim
117 words
The invention of claim 28 wherein said directional control valve is a pilot signal operated spring centered piston valve and additionally including first and second pilot pressure lines extending from an operator controlled selectively operable valve for selectively connecting one of said pilot pressure lines to a source of pressure while the other is connected to an exhaust line or for connecting both of said pilot pressure lines simultaneously in fluid communication with each other so that said directional control valve assumes a spring biased blocking position in which said first second cylinder hydraulic power line and said second second cylinder hydraulic power line are blocked to hold said second piston and cylinder assembly in fixed position.
Claim 32
Dependent Claim
38 words
The invention of claim 29 wherein said first and second hydraulic power inlet lines are selectively connectable to a source of hydraulic pressure or to an exhaust sump through a four-way three-position master valve operable by the operator.
Claim 33
Dependent Claim
70 words
The invention of claim 30 wherein said first and second main hydraulic power inlet lines each include a selectively operable valve for connecting said line to a source of hydraulic pressure or to an exhaust with each of said valves in said first and second main hydraulic power inlet lines being selectively operable to connect both of said main hydraulic power inlet lines simultaneously to said source of hydraulic pressure.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |