US3590948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basket-leveling system for boom structures
Assignee: BAKER EQUIPMENT ENG CO
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Filing: 1970-02-10
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Granted: 1971-07-06
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Expires: 1990-02-10
Abstract
Abstract A mobile aerial tower having a pivotally mounted boom for movement about a vertical and a horizontal axis, and a loadsupporting platform such as a workman''s basket supported on the outer end of the boom for pivoted movement about a horizontal axis, a reversible fluid motor for rotating the platform about the horizontal axis, a hydraulic control valve having a portion maintained in preselected orientation relative to the platform for controlling hydraulic fluid supply to the motor, and a pivotally supported weighted pendulum connected to the valve to continuously regulate fluid flow to the motor so as to maintain the platform in a preselected level condition.
Inventors
- 👤 Edwin Earl Milner Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:15
CPC Classifications
B; B66; B66F; B66F11/00; B66F11/04; B66F11/044
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A mobile aerial tower comprising a truck having a pivotally mounted boom supported for movement about a vertical axis and a first horizontal axis, a workman''s basket supported on said boom at an outer end thereof for pivoted movement about a second horizontal axis, a reversible fluid motor coupled to said basket to rotate the basket about said second horizontal axis, a hydraulic control valve for controlling hydraulic fluid supply to said fluid motor, means maintaining a portion of said valve in preselected orientation relative to the basket, and a pivotally supported weighted pendulum connected to said hydraulic control valve to continuously regulate the flow of hydraulic fluid to said fluid motor so as to maintain the basket in a preselected level condition for any tilted positions of the boom throughout the range of movement of the boom.
Claim 2
Dependent Claim
138 words
A mobile aerial tower comprising a truck having a pivotally mounted boom supported for movement about a vertical axis and a first horizontal axis, a workman''s basket supported on said boom at an outer end thereof for pivoted movement about a second horizontal axis, a reversible fluid motor coupled to said basket to rotate the basket about said second horizontal axis, a hydraulic control valve for controlling hydraulic fluid supply to said fluid motor, means maintaining a portion of said valve in preselected orientation relative to the basket, and a pivotally supported weighted pendulum connected to said hydraulic control valve to continuously regulate the flow of hydraulic fluid to said fluid motor so as to maintain the basket in a preselected level condition for any tilted positions of the boom throughout the range of movement of the boom.
Claim 3
Dependent Claim
137 words
A mobile aerial tower as defined in claim 1, wherein said hydraulic control valve comprises a valve body support in fixed angular relation to the basket and having a cylindrical bore therein and first ports for communicating hydraulic fluid to said bore from a supply source and from said fluid motor, and a rotatable, substantially cylindrical valve member in said bore having an exposed end portion connected to said pendulum to be angularly positioned thereby, said valve member having second ports therein selectively positioned relative to said first ports to normally place the valve in a neutral nonflow condition when the basket is level and to communicate with said first ports in combinations to activate the fluid motor to restore the basket to leveled condition as the basket and valve body are angularly tilted from leveled condition.
Claim 4
Dependent Claim
53 words
A mobile aerial tower as defined in claim 1, wherein said reversible fluid motor has an output shaft having a worm driven thereby and said basket is fixed to a horizontal shaft journaled in the end portion of the boom and having a worm gear fixed thereto to be driven by said worm.
Claim 5
Dependent Claim
53 words
A mobile aerial tower as defined in claim 2, wherein said reversible fluid motor has an output shaft having a worm driven thereby and said basket is fixed to a horizontal shaft journaled in the end portion of the boom and having a worm gear fixed thereto to be driven by said worm.
Claim 6
Dependent Claim
130 words
A mobile aerial tower as defined in claim 1, wherein said valve has a substantially cylindrical valve member and a valve body, said cylindrical valve member having a pair of axially spaced uninterrupted circumferential grooves defining a central cylinder portion therebetween, said first ports in said valve body including a pair of first port sections respectively communicating with said grooves and connected to fluid supply lines forming pressure and exhaust lines to said supply source and second port sections communicating with said fluid motor and with saId bore in the zone between the locations of said grooves, and said valve member ports being arranged to interconnect said first and second port sections in relatively reversed relation upon rotation of said valve member in opposite directions from a selected neutral position.
Claim 7
Dependent Claim
118 words
A mobile aerial tower as defined in claim 2, wherein said cylindrical valve member has a pair of axially spaced uninterrupted circumferential grooves defining a central cylinder portion therebetween, said first ports in said valve body including a pair of first port sections respectively communicating with said grooves and connected to fluid supply lines forming pressure and exhaust lines to said supply source and second port sections communicating with said fluid motor and with said bore in the zone between the locations of said grooves, and said valve member ports being arranged to interconnect said first and second port sections in relatively reversed relation upon rotation of said valve member in opposite directions from a selected neutral position.
Claim 8
Dependent Claim
130 words
A mobile aerial tower as defined in claim 3, wherein said valve has a substantially cylindrical valve member and a valve body, said cylindrical valve member having a pair of axially spaced uninterrupted circumferential grooves defining a central cylinder portion therebetween said first ports in said valve body including a pair of first port sections respectively communicating with said grooves and connected to fluid supply lines forming pressure and exhaust lines to said supply source and second port sections communicating with said fluid motor and with said bore in the zone between the locations of said grooves, and said valve member ports being arranged to interconnect said first and second port sections in relatively reversed relation upon rotation of said valve member in opposite directions from a selected neutral position.
Claim 9
Dependent Claim
118 words
A mobile aerial tower as defined in claim 4, wherein said cylindrical valve member has a pair of axially spaced uninterrupted circumferential grooves defining a central cylinder portion therebetween, said first ports in said valve body including a pair of first port sections respectively communicating with said grooves and connected to fluid supply lines forming pressure and exhaust lines to said supply source and second port sections communicating with said fluid motor and with said bore in the zone between the locations of said grooves, and said valve member ports being arranged to interconnect said first and second port sections in relatively reversed relation upon rotation of said valve member in opposite directions from a selected neutral position.
Claim 10
Dependent Claim
76 words
A mobile aerial tower as defined in claim 5, wherein said cylindrical valve member has a pair of first uninterrupted circumferential grooves form fluid leak collector grooves spaced in outwardly flanking relation to said central cylinder portion and a pair of seal grooves spaced in outwardly flanking relation to said fluid leak collector grooves occupied by sealing ring means bearing radially outwardly against the surface of said bore to provide a seal against leakage of fluid.
Claim 11
Dependent Claim
76 words
A mobile aerial tower as defined in claim 6, wherein said cylindrical valve member has a pair of first uninterrupted circumferential grooves form fluid leak collector grooves spaced in outwardly flanking relation to said central cylinder portion and a pair of seal grooves spaced in outwardly flanking relation to said fluid leak collector grooves occupied by sealing ring means bearing radially outwardly against the surface of said bore to provide a seal against leakage of fluid.
Claim 12
Dependent Claim
76 words
A mobile aerial tower as defined in claim 7, wherein said cylindrical valve member has a pair of first uninterrupted circumferential grooves form fluid leak collector grooves spaced in outwardly flanking relation to said central cylinder portion and a pair of seal grooves spaced in outwardly flanking relation to said fluid leak collector grooves occupied by sealing ring means bearing radially outWardly against the surface of said bore to provide a seal against leakage of fluid.
Claim 13
Dependent Claim
76 words
A mobile aerial tower as defined in claim 8, wherein said cylindrical valve member has a pair of first uninterrupted circumferential grooves form fluid leak collector grooves spaced in outwardly flanking relation to said central cylinder portion and a pair of seal grooves spaced in outwardly flanking relation to said fluid leak collector grooves occupied by sealing ring means bearing radially outwardly against the surface of said bore to provide a seal against leakage of fluid.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |