US3777845A - Hydraulically operated access equipment - Google Patents

Hydraulically operated access equipment Download PDF

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Publication number
US3777845A
US3777845A US00242706A US3777845DA US3777845A US 3777845 A US3777845 A US 3777845A US 00242706 A US00242706 A US 00242706A US 3777845D A US3777845D A US 3777845DA US 3777845 A US3777845 A US 3777845A
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US
United States
Prior art keywords
booms
hydraulic
access equipment
actuators
boom structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00242706A
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English (en)
Inventor
D Ashworth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Simon Engineering Dudley Ltd
Original Assignee
Simon Engineering Dudley Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Simon Engineering Dudley Ltd filed Critical Simon Engineering Dudley Ltd
Application granted granted Critical
Publication of US3777845A publication Critical patent/US3777845A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/044—Working platforms suspended from booms

Definitions

  • ABSTRACT Hydraulically operable access equipment usually but not necessarily vehicle mounted, and of the kind comprising a boom structure consisting of a plurality of booms pivotally connected together in end to end relationship, hydraulic actuators with an associated hydraulic control system for moving the boom structure between a stowed position wherein at least some of the booms lie parallel with one another in a substantially horizontal direction and an extended position wherein the free end of the boom structure is raised to an elevated position, characterised by the provision of secondary, normally closed, inlet and outlet ports to the oil chambers of at least some of the hydraulic actuators, and an auxiliary system comprising a pump and flexible hoses capable of being extended from [56] References Cited 'such pump for connection to the secondary inlet and UNITED STATES PATENTS outlet ports of each said actuator, whereby such actu- 3,528,524 9/1970 Birbanescu 182/2 my be operated to permit movement of the boom structure to its stowed position by use of said OW 6S 3,633,363 111972 Larsen
  • Hydraulically operable access equipment is now widely used for numerous industrial, maintenance and service applications such as fire fighting for example. Generally such equipment is highly reliable but failure of one part or another of the hydraulic system is not unknown.
  • hydraulically operable access equipment of the kind referred to is characterised by the provision of secondary, normally closed, inlet and outlet ports to the oil chambers of at least some of the hydraulic actuators, and an auxiliary hydraulic system comprising a pump and flexible hoses capable of being extended from such pump for connection to the secondary inlet and outlet ports of each said actuator, whereby such actuators may be operated to permit movement of the boom structure to its stowed position by use of said auxiliary hydraulic system.
  • the free ends of said hoses are equipped with coupling means adapted to be connected instantly to said secondary ports.
  • FIG. 1 shows a diagrammatic side elevation of the equipment
  • FIG. 2 shows a side elevation of one of the hydraulic rams of the equipment of FIG. 1, on an enlarged scale.
  • the equipment comprises, in known manner, an articulated boom structure, generally indicated at 10, mounted on the chassis of a vehicle 11.
  • the boom structure comprises a first boom 12 whose root is pivotally connected to a turntable structure 13 secured to the vehicle chassis, and a boom 14 pivotally connected to the other end of the boom 12, and carrying at its free end a working platform or cage 15 for an operator.
  • An hydraulic motor is provided to effect rotation of the turntable structure 13, and double acting hydraulic rams 16 and 17 are provided and pivotally connected between the structure 13 and boom 12, and booms l2 and 14 respectively. It will be understood that the rams l6 and 17 may be actuated to move the boom structure between its stowed position (as illustrated in FIG.
  • the vehicle 11 is equipped with extendable and retractable ground engaging stabilising jacks 18 which are operated by further hydraulic rams (not shown) to ensure that the vehicle is in a stable condition when the boom structure is to be raised.
  • auxiliary hydraulic system is provided selectively to operate any one of the various hydraulic actuators whereby the boom structurecan be moved from an elevated position to its stowed or travelling position, and the ground engaging jacks l8 retracted to permit the vehicle 11 to be moved, in the event of any failure of the pump-19, the control valves or lines connecting these parts with the actuators themselves.
  • a secondary hydraulic pump 20 is provided.
  • the pressure outlet and return flow inlet ports of the pump 20 are connected with flexible hoses which are normally stowed on reels 21 and 22 respectively.
  • Each of the hoses is of such length as to ensure that its free end can be carried to the vicinity of the most remote actuator when such actuator is in its most remote position relative to the pump 20 by virtue of the configuration of the boom structure.
  • Each of the hydraulic actuators is equipped with secondary, normally closed, inlet and outlet ports communicating with the oil chambers thereof, and the free ends of the flexible hoses are adapted to be coupled directly with these ports by instantly and manually operable snap-on connectors.
  • the double acting hydraulic ram 16 is provided with normal pressure fluid inlet and outlet lines 23 and 24 respectively and auxiliary ports 25 and 26 adapted to be communicated with the oil chambers on either side of the piston thereof when connected with the flexible hoses from reels 21 and 22.
  • hoses from reels 21 and 22 can be extended and connected to the secondary ports of any required hydraulic actuator to enable same to be operated and hence to permit the boom structure to be moved to its stowed or travelling position and the ground engaging jacks to be raised.
  • the equipment includes means to enable the operator to have direct access to each of the actuators for the purpose of connecting the flexible hoses therewith without the necessity of any special equipment.
  • Such means preferably comprises ladder means 3 28 extending alongside the booms and movable therewith.
  • a boom structure comprises at least two booms pivotally connected together with one end of, one of said booms movably mounted on a support, said booms being movable between a stowed position on said support and extended working positions.
  • At least one hydraulic actuator is connected between said one boom and said support and at least one hydraulic actuator is connected between said booms, and a main hydraulic system having a main pump is connected to operate said actuators to normally move said booms between said positions, characterized by the provision of secondary, normally closed, inlet and outlet ports to the hydraulic fluid chambers of said hydraulic actuators, and an auxiliary hydraulic system comprising a secondary pump and flexible hoses connected at one end to said secondary pump and of such length as to be capable of being extended from such secondary pump for connection to the secondary inlet and outlet ports of each said actuator with said booms in or between said positions, whereby such actuators may be operated to permit movement of the boom structure to its 4 stowed position by use of. said auxiliary hydraulic system.
  • boom structure is mounted on a turntable adapted to be rotated by a hydraulic motor said motor being provided with secondary, normally closed, inlet and outlet ports whereby it may be actuated by use of the auxiliary hydraulic system.
  • Hydraulically operable access equipment including hydraulically operable extendable and retractable ground engaging stabilising jacks whose hydraulic actuators are provided with secondary, normally closed, inlet and outlet ports whereby said jacks may be operated by use of said auxiliary hydraulic system.
  • l-lydraulically operable access equipmentv including ladder means carried by the booms to give an operator access to any of the hydraulic actuators for the purpose of coupling said flexible hoses therewith.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
US00242706A 1971-04-28 1972-04-10 Hydraulically operated access equipment Expired - Lifetime US3777845A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1178971 1971-04-28

Publications (1)

Publication Number Publication Date
US3777845A true US3777845A (en) 1973-12-11

Family

ID=9992735

Family Applications (1)

Application Number Title Priority Date Filing Date
US00242706A Expired - Lifetime US3777845A (en) 1971-04-28 1972-04-10 Hydraulically operated access equipment

Country Status (6)

Country Link
US (1) US3777845A (show.php)
AT (1) AT320209B (show.php)
CA (1) CA991101A (show.php)
DE (1) DE2219495C3 (show.php)
FI (1) FI51091C (show.php)
GB (1) GB1325402A (show.php)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4775029A (en) * 1987-10-08 1988-10-04 Jlg Industries, Inc. Collapsible tower boom lift
US6460652B1 (en) * 1998-05-26 2002-10-08 Sandvik Tamrock Oy Boom arrangement for rock drilling apparatus
US6755258B1 (en) * 2003-01-27 2004-06-29 Smeal Fire Apparatus Co. Aerial ladder fire fighting apparatus with positionable waterway

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN159477B (show.php) * 1982-05-28 1987-05-23 Simon Eng Dudley Ltd
US5746286A (en) * 1996-09-05 1998-05-05 Mat-3, Inc. Hydraulic boom platform leveling system
CN104925712B (zh) * 2015-05-06 2017-07-07 徐工消防安全装备有限公司 一种高空作业平台的储藏式折叠臂架

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US589958A (en) * 1897-09-14 Hydraulic system for closing water-tight bulkheads on board ships
US3213948A (en) * 1962-03-12 1965-10-26 Ohio Brass Co Derrick
US3528524A (en) * 1964-11-27 1970-09-15 Adrian Birbanescu Hydraulic filming or television camera crane
US3584703A (en) * 1968-06-07 1971-06-15 Simon Eng Dudley Ltd Hydraulic platforms
US3633363A (en) * 1970-06-03 1972-01-11 Bendix Corp Hydraulic boost device with emergency fluid supply

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US589958A (en) * 1897-09-14 Hydraulic system for closing water-tight bulkheads on board ships
US3213948A (en) * 1962-03-12 1965-10-26 Ohio Brass Co Derrick
US3528524A (en) * 1964-11-27 1970-09-15 Adrian Birbanescu Hydraulic filming or television camera crane
US3584703A (en) * 1968-06-07 1971-06-15 Simon Eng Dudley Ltd Hydraulic platforms
US3633363A (en) * 1970-06-03 1972-01-11 Bendix Corp Hydraulic boost device with emergency fluid supply

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4775029A (en) * 1987-10-08 1988-10-04 Jlg Industries, Inc. Collapsible tower boom lift
US6460652B1 (en) * 1998-05-26 2002-10-08 Sandvik Tamrock Oy Boom arrangement for rock drilling apparatus
US6755258B1 (en) * 2003-01-27 2004-06-29 Smeal Fire Apparatus Co. Aerial ladder fire fighting apparatus with positionable waterway

Also Published As

Publication number Publication date
AT320209B (de) 1975-01-27
DE2219495C3 (de) 1975-11-13
CA991101A (en) 1976-06-15
GB1325402A (en) 1973-08-01
FI51091C (fi) 1976-10-11
FI51091B (show.php) 1976-06-30
DE2219495B2 (de) 1975-04-03
DE2219495A1 (de) 1972-11-09

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