OPENTECHNICAL PUBLICATION
OT-2026-000003422

Vacuum control system for lifting systems

Published: 2026-09-15T20:25:36.927028Z
Permanent URL: https://opentechnical.org/p/OT-2026-000003422
Categories: Lifting, Positioning & Manipulation > Lift Tables and Positioners

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ABSTRACT

This invention provides improved body length adjustment value structure for a
vacuum powered lifting system of the type that embodies a variable length
lifting body responsive to the differential of pressure inside that body with
atmospheric pressure to resolve critical manual control problems. Thus control
is provided by proportional movement of a control member over a substantially
linear range producing a smooth progressive movement of the lifting mechanism.
This permits non-critical lowering and release of a work load object by
unskilled operators. Thus, an air injection valve with an air release port, is
positioned within the lifting body having an elongated slot operable over a
control range proportionately change the body length by release of a
progressively increasing flow of air into the body to increase air pressure
and body length over the critical range of lowering and releasing the work
load object in response to a corresponding substantially linear movement of
the control member. Variable adjustment value structure establishes a known
upper lift limit by control of the length of the body both under loaded and
unloaded conditions, and provisions are made to keep a vacuum responsive work
object grasping mechanism continuously operable.

1. Drawings

[0001] Sheet 1.

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OpenTechnical publication OT-2026-000003422
Published 2026-09-15T20:25:36.927028Z
https://opentechnical.org/p/OT-2026-000003422