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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-4858723-A, on 22 August 1989. 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-2026-000003475

Bucket leveling system

Published
Permanent URL
Classification
Lifting, Positioning & Manipulation › Lift Tables and Positioners
Inventors
HOLMES WILLIAM K, MLAKER JOHN J
Assignee
HI RANGER INC
Original source
US-4858723-A, the United States Patent and Trademark Office, 22 August 1989
Document SHA-256
3f1a4ace09414d9edbb0a15f9932c0249339222e0cf092b5243fc7ce695a7e2f

An aerial lift includes a bucket mounted at the outer end of an articulated boom assembly having upper and lower booms. A hydraulic cylinder is provided for extending the upper boom relative to the lower boom, and a rotary actuator is provided for varying the rotational position of the bucket relative to the upper boom. An auxiliary cylinder, actuated in response to actuation of the upper boom hydraulic cylinder, provides hydraulic fluid to the rotary actuator so as to maintain the bucket in a substantially level position as the articulated boom assembly is raised and lowered. The load train including a chain and sector-shaped sprocket automatically compensate upper boom angle for changes in the angle of the lower boom relative to horizontal so that the rotary actuator is actuated only in response to actual changes in the angular position of the upper boom relative to horizontal.

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Abstract

An aerial lift includes a bucket mounted at the outer end of an articulated boom assembly having upper and lower booms. A hydraulic cylinder is provided for extending the upper boom relative to the lower boom, and a rotary actuator is provided for varying the rotational position of the bucket relative to the upper boom. An auxiliary cylinder, actuated in response to actuation of the upper boom hydraulic cylinder, provides hydraulic fluid to the rotary actuator so as to maintain the bucket in a substantially level position as the articulated boom assembly is raised and lowered. The load train including a chain and sector-shaped sprocket automatically compensate upper boom angle for changes in the angle of the lower boom relative to horizontal so that the rotary actuator is actuated only in response to actual changes in the angular position of the upper boom relative to horizontal.

1. Drawings

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Publication information

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Citation

OpenTechnical Publication OT-2026-000003475, “Bucket leveling system,” published September 15, 2026 at 20:32:18 UTC, https://opentechnical.org/p/OT-2026-000003475.

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