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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-5431469-A, on 11 July 1995. 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-2026-000003303

Vacuum lift device

Published
Permanent URL
Classification
Lifting, Positioning & Manipulation › Lift Tables and Positioners
Inventors
NAKAMURA TAKAYOSHI, OHNO MASAYUKI, SCHMALZ KURT, SCHMALZ WOLFGANG, YAMADA HIROSHI
Assignee
KITO KK, SCHMALZ J GMBH
Original source
US-5431469-A, the United States Patent and Trademark Office, 11 July 1995
Document SHA-256
c602b8317d08e4287b526a867541d005f598b7ce8db1615c9cdd5a9103583038

A vacuum lift device comprising a lift tube which is able to contract and expand in an upward and downward direction, and a lift tube expansion control valve controlling the opening areas of the atmospheric openings of the lift tube. A hovering control valve controlling the flow area between the second atmospheric opening and the interior of the lift tube is provided. The lift tube expansion control valve is normally positioned at a position such that is completely covers the first atmospheric opening, and the second atmospheric opening is open to the outside space. At this time, the level of vacuum in the lift tube is adjusted by the hovering control valve so that an object to be lifted is maintained at a desired height.

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Abstract

A vacuum lift device comprising a lift tube which is able to contract and expand in an upward and downward direction, and a lift tube expansion control valve controlling the opening areas of the atmospheric openings of the lift tube. A hovering control valve controlling the flow area between the second atmospheric opening and the interior of the lift tube is provided. The lift tube expansion control valve is normally positioned at a position such that is completely covers the first atmospheric opening, and the second atmospheric opening is open to the outside space. At this time, the level of vacuum in the lift tube is adjusted by the hovering control valve so that an object to be lifted is maintained at a desired height.

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Publication information

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Citation

OpenTechnical Publication OT-2026-000003303, “Vacuum lift device,” published September 15, 2026 at 20:06:06 UTC, https://opentechnical.org/p/OT-2026-000003303.

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Terms

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.