US3658189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic extensible boom structure
Assignee: AMERICAN CRANE Corp A CORP OF
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Filing: 1970-01-06
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Granted: 1972-04-25
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Expires: 1990-01-06
Abstract
Abstract A plurality of telescoping boom sections are powered by double acting hydraulic piston-cylinder motors, each motor having a hollow piston rod pivotally mounted to the inward end of an inward boom member, a piston on the rod, and a cylinder fixedly and rigidly mounted at its inward rod end to an inward end of the next adjacent nesting outward boom member. Hydraulic fluid to move the boom sections to extended and retracted positions is fed from the pivoted end of each of the piston rods, and along those rods to ''''extend'''' and ''''retract'''' cylinder chambers on opposite sides of the piston. ''''Extend'''' and ''''retract'''' conduits from these chambers on each inward motor open from opposite ends of each inward cylinder to carry this fluid to and from the next outward piston rod. A normally closed hydraulic valve is situated in each ''''extend'''' conduit, and this valve is opened to provide a flow path to its outward motor only when the inward motor is fully extended. When two adjacent inward boom sections reach their extended positions with respect to each other, they are latched to each other against further longitudinal movement. Each such latch is mechanically released by the arrival at its fully retracted position of the boom section next outward from the latched pair.
Inventors
- 👤 Archer W Brown
- 👤 James L Montgomery
- 👤 Charles W Wienke
- 👤 Alfons Roskowinski
- 👤 William A Braddock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:39
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/705
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
511 words
In an extensible boom having a first tubular base boom section; a second tubular boom section telescopically mounted within the first section for longitudinal movement witH respect thereto, a third boom section telescopically mounted within said second section for longitudinal movement with respect to said second section; a first cylinder-piston fluid motor having a piston rod pivotally mounted and mounted for transverse movement in a vertical plane at a first inward end thereof to an inward end of said first section, a cylinder rigidly mounted at its inward rod end to the inward end of said second section, and a piston on a second outward end of said piston rod in sealing, sliding, relationship to an interior surface of the wall of said cylinder; a second cylinder-piston fluid motor having a piston rod pivotally mounted and mounted for transverse movement in a vertical plane at a first inward end thereof to an inward end of said second section, a cylinder rigidly mounted at its inward rod end to an inward end of the third section, and a piston on a second outward end of said piston rod in sealing, sliding relationship to an interior surface of the wall of said cylinder; a first conduit open through each piston rod and piston from the fastened end of the rod to the piston face opposite the piston rod; a second conduit open through the wall of the cylinder of the first motor from adjacent the closed end of said cylinder to the first conduit in the piston rod of the second motor at the fastened end of the rod; a third conduit open through the wall of each piston rod at position adjacent its piston, extending along and inside the piston rod to position adjacent its fastened end; a fourth conduit open to the third conduit adjacent the fastened rod end of the second motor and to and through the wall of the cylinder of the first motor at position adjacent the rod end thereof; and means to selectively (1) supply fluid under pressure to a first conduit and to receive fluid from a third conduit at the fastened end of the piston rod of the first motor, (2) to supply fluid to said third conduit and to receive fluid from said first conduit, and (3) to block flow of fluid from either such conduit; the improvement comprising: a normally closed hydraulic valve in said second conduit, said valve having: 1. a base casting mounted in adjacent relationship to the rod end of the first cylinder, 2. a valve stem slidably mounted in said base casting and extending through the wall of said cylinder in position to be moved by the piston in the cylinder, and 3. a valve spool on said valve stem, said valve spool being movable between a first condition in fluid blocking relationship to said second conduit when said valve stem is in spaced relationship to said piston and a second condition in fluid passing relationship to said conduit after said piston has contacted and moved the valve stem.
Claim 2
Dependent Claim
511 words
In an extensible boom having a first tubular base boom section; a second tubular boom section telescopically mounted within the first section for longitudinal movement witH respect thereto, a third boom section telescopically mounted within said second section for longitudinal movement with respect to said second section; a first cylinder-piston fluid motor having a piston rod pivotally mounted and mounted for transverse movement in a vertical plane at a first inward end thereof to an inward end of said first section, a cylinder rigidly mounted at its inward rod end to the inward end of said second section, and a piston on a second outward end of said piston rod in sealing, sliding, relationship to an interior surface of the wall of said cylinder; a second cylinder-piston fluid motor having a piston rod pivotally mounted and mounted for transverse movement in a vertical plane at a first inward end thereof to an inward end of said second section, a cylinder rigidly mounted at its inward rod end to an inward end of the third section, and a piston on a second outward end of said piston rod in sealing, sliding relationship to an interior surface of the wall of said cylinder; a first conduit open through each piston rod and piston from the fastened end of the rod to the piston face opposite the piston rod; a second conduit open through the wall of the cylinder of the first motor from adjacent the closed end of said cylinder to the first conduit in the piston rod of the second motor at the fastened end of the rod; a third conduit open through the wall of each piston rod at position adjacent its piston, extending along and inside the piston rod to position adjacent its fastened end; a fourth conduit open to the third conduit adjacent the fastened rod end of the second motor and to and through the wall of the cylinder of the first motor at position adjacent the rod end thereof; and means to selectively (1) supply fluid under pressure to a first conduit and to receive fluid from a third conduit at the fastened end of the piston rod of the first motor, (2) to supply fluid to said third conduit and to receive fluid from said first conduit, and (3) to block flow of fluid from either such conduit; the improvement comprising: a normally closed hydraulic valve in said second conduit, said valve having: 1. a base casting mounted in adjacent relationship to the rod end of the first cylinder, 2. a valve stem slidably mounted in said base casting and extending through the wall of said cylinder in position to be moved by the piston in the cylinder, and 3. a valve spool on said valve stem, said valve spool being movable between a first condition in fluid blocking relationship to said second conduit when said valve stem is in spaced relationship to said piston and a second condition in fluid passing relationship to said conduit after said piston has contacted and moved the valve stem.
Claim 3
Dependent Claim
29 words
a valve stem slidably mounted in said base casting and extending through the wall of said cylinder in position to be moved by the piston in the cylinder, and
Claim 4
Dependent Claim
29 words
a valve stem slidably mounted in said base casting and extending through the wall of said cylinder in position to be moved by the piston in the cylinder, and
Claim 5
Dependent Claim
393 words
In an extensible boom having a base boom section; a plurality of intermediate boom sections telescopically mounted with respect to each other and within said base section; an outward boom section telescopically mounted within the outwardmost intermediate section, a cylinder-piston fluid motor attached between each pair of adjacent boom sections, each motor having a piston rod fastened to an inward end of the inward one of the pair, a cylinder mounted with respect to the outward one of the pair, and a piston on said piston rod in operative relation to said cylinder; a first conduit open through each piston rod and piston from the fastened end of the rod to the piston face opposite the piston rod, a second conduit open through the wall of each cylinder except the outwardmost one from adjacent the closed end of said cylinder to the first conduit in the piston rod of the next outward motor at the fastened end of the rod; a third conduit open through the wall of each piston rod at position adjacent its piston, extending along and inside the piston rod to position adjacent its fastened end; a fourth conduit, except in the inwardmost motor, open to the third conduit adjacent the fastened rod end and to and through the wall of the nExt adjacent inward motor cylinder at position adjacent the rod end thereof; and means to selectively (1) supply fluid under pressure to a first conduit and to receive fluid from a third conduit at the fastened end of the inwardmost piston rod, (2) to supply fluid to said third conduit and to receive fluid from said first conduit, and (3) to block flow of fluid from either such conduit; the improvement comprising: a valve casing mounted adjacent each cylinder except the outer most one; a normally closed valve operably mounted in each such casing in normally fluid blocking relation to the second conduit which extends from its associated cylinder; a valve operator operably connected with said valve and extending through said casing and the wall of said cylinder to be in the path of travel of the piston and piston rod combination in said cylinder, said operator being operated in response to arrival of said piston at substantially the extended limit of its travel to cause said valve to move to fluid passing relationship to said second conduit.
Claim 6
Dependent Claim
393 words
In an extensible boom having a base boom section; a plurality of intermediate boom sections telescopically mounted with respect to each other and within said base section; an outward boom section telescopically mounted within the outwardmost intermediate section, a cylinder-piston fluid motor attached between each pair of adjacent boom sections, each motor having a piston rod fastened to an inward end of the inward one of the pair, a cylinder mounted with respect to the outward one of the pair, and a piston on said piston rod in operative relation to said cylinder; a first conduit open through each piston rod and piston from the fastened end of the rod to the piston face opposite the piston rod, a second conduit open through the wall of each cylinder except the outwardmost one from adjacent the closed end of said cylinder to the first conduit in the piston rod of the next outward motor at the fastened end of the rod; a third conduit open through the wall of each piston rod at position adjacent its piston, extending along and inside the piston rod to position adjacent its fastened end; a fourth conduit, except in the inwardmost motor, open to the third conduit adjacent the fastened rod end and to and through the wall of the nExt adjacent inward motor cylinder at position adjacent the rod end thereof; and means to selectively (1) supply fluid under pressure to a first conduit and to receive fluid from a third conduit at the fastened end of the inwardmost piston rod, (2) to supply fluid to said third conduit and to receive fluid from said first conduit, and (3) to block flow of fluid from either such conduit; the improvement comprising: a valve casing mounted adjacent each cylinder except the outer most one; a normally closed valve operably mounted in each such casing in normally fluid blocking relation to the second conduit which extends from its associated cylinder; a valve operator operably connected with said valve and extending through said casing and the wall of said cylinder to be in the path of travel of the piston and piston rod combination in said cylinder, said operator being operated in response to arrival of said piston at substantially the extended limit of its travel to cause said valve to move to fluid passing relationship to said second conduit.
Claim 7
Dependent Claim
56 words
a valve spool on said valve stem, said valve spool being movable between a first condition in fluid blocking relationship to said second conduit when said valve stem is in spaced relationship to said piston and a second condition in fluid passing relationship to said conduit after said piston has contacted and moved the valve stem.
Claim 8
Dependent Claim
56 words
a valve spool on said valve stem, said valve spool being movable between a first condition in fluid blocking relationship to said second conduit when said valve stem is in spaced relationship to said piston and a second condition in fluid passing relationship to said conduit after said piston has contacted and moved the valve stem.
Claim 9
Dependent Claim
161 words
The combination as specified in claim 1 and a mechanical interlock including: a. a locking bolt slidably mounted on the interior of the second boom section at position near the inward end thereof, said second boom section being provided with an opening to pass said bolt; b. means to urge said bolt through said opening; c. said first section being provided with an opening which is positioned to be in alignment with said opening in said second section when said second section is substantially fully extended with respect to said first section; and d. camming means mounted on said third section in operative relationship to said sliding bolt to move said bolt inwardly with respect to said second boom section as said third section is fully retracted with respect thereto and to allow said bolt to move through each of said openings in said first and second sections and as said third section moves outwardly with respect to said second section.
Claim 10
Dependent Claim
122 words
The combination as specified in claim 2, and a mechanical interlock including: a. bolt means carried on the outwardmost of each adjacent boom section pair except the outwardmost pair operative to lock said pair against longitudinal movement with respect to each other when they are in extended relationship to each other, and b. means carried on the boom section next outward from the pair to allow said bolt means to be operative responsive to movement of said next outward section in extended direction with respect to the pair, and to move said bolt means to inoperative, unlocked relationship with respect to said pair responsive to arrival of said next outward section at fully retracted relationship to the outward section of said pair.
Claim 11
Dependent Claim
141 words
The combination as specified in claim 3 wherein: a. a collar extends outwardly from the locking bolt; b. an ear is integrally mounted on said second section and is provided with an opening in which said bolt is slidably mounted; c. said urging means is constituted as a coil spring surrounding said bolt and bearing on said collar and said ear; and d. said camming means is constituted as at least one ramped finger integral with said third section and in alignment with said collar to cause it to carry said bolt into retracted, unlocked position against the action of said spring when said third section moves into fully retracted relationship to said second section, and to allow said bolt to move toward locked position under the urging of said spring as said third section starts to move toward extended position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |