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This is a record of a document published elsewhere, first published by the United States Patent and Trademark Office, as US-5819534-A, on 13 October 1998. OpenTechnical did not first disclose it. The identifier, hashes and timestamps below record what this library served and when, not when the material became public. View the original.

OT-2026-000003200

Articulated aerial device with hydraulic upper boom compensation

Published
Permanent URL
Classification
Lifting, Positioning & Manipulation › Lift Tables and Positioners
Inventors
BEVING JOSEPH R, FISCHER GREGORY L, SCHULTE CHARLES A
Assignee
SIMON TELELECT INC
Original source
US-5819534-A, the United States Patent and Trademark Office, 13 October 1998
Document SHA-256
02b965175e743165400be7447a2d1c143b5990d3650e1950c67d2fdaf487ad21

An aerial lift unit is truck mounted. The lift includes a lower boom pivoted to the truck and an upper boom pivotally connected to the outer end of the first boom. A lower boom cylinder unit is connected to pivot and thereby raise and lower the lower boom. A second tandem cylinder unit consists of first and second cylinders with the head end interconnected and having cylinder rods extending coaxially outwardly from the opposite rod ends. The one cylinder rod is connected to the lower boom and the second piston rod is connected to the base of a V-shaped coupling member having one arm pivotally connected to the lower boom and a second arm is pivotally connected to the upper boom. The second cylinder positions the upper boom in a preset orientation with respect to the lower boom. The first cylinder is connected in a hydraulic supply circuit with the lower boom cylinder and with the hydraulic fluid flow serially through the lift cylinder and second cylinder. The hydraulic fluid flow in one direction raises the lift unit and in the opposite direction lowers the lift unit, with automatic compensation of the upper boom position relative to the lower boom in all positions of the latter.

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Abstract

An aerial lift unit is truck mounted. The lift includes a lower boom pivoted to the truck and an upper boom pivotally connected to the outer end of the first boom. A lower boom cylinder unit is connected to pivot and thereby raise and lower the lower boom. A second tandem cylinder unit consists of first and second cylinders with the head end interconnected and having cylinder rods extending coaxially outwardly from the opposite rod ends. The one cylinder rod is connected to the lower boom and the second piston rod is connected to the base of a V-shaped coupling member having one arm pivotally connected to the lower boom and a second arm is pivotally connected to the upper boom. The second cylinder positions the upper boom in a preset orientation with respect to the lower boom. The first cylinder is connected in a hydraulic supply circuit with the lower boom cylinder and with the hydraulic fluid flow serially through the lift cylinder and second cylinder. The hydraulic fluid flow in one direction raises the lift unit and in the opposite direction lowers the lift unit, with automatic compensation of the upper boom position relative to the lower boom in all positions of the latter.

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Publication information

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Citation

OpenTechnical Publication OT-2026-000003200, “Articulated aerial device with hydraulic upper boom compensation,” published September 15, 2026 at 19:48:19 UTC, https://opentechnical.org/p/OT-2026-000003200.

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This record reproduces a document published elsewhere and is provided for reference and study. Rights in the original remain with its owner. See the publication policy.