OPENTECHNICAL PUBLICATION
OT-2026-000001524

Lifting device

Published: 2026-09-15T19:06:26.190004Z
Permanent URL: https://opentechnical.org/p/OT-2026-000001524
Categories: Lifting, Positioning & Manipulation > Lift Tables and Positioners

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ABSTRACT

A lifting device 100 has a lifting beam 120 with legs 130, 135 at each end and
an attachment means, possibly hooks 110, to attach to an article, such as a
manhole cover. An elongate support 140 is pivotally attached to the lifting
beam and has pump piston 160 connected to the support and the beam. When the
pump is activated, extending a piston shaft 164 from piston body 162, the
elongate support is rotated relative to the beam thus lifting the beam. A pair
of side walls 170, 175 extend from the elongate support either side of the
piston body where at least one wall extends beyond the piston body, possibly
reducing the chance of damage of tampering with a pressure setting set screw
(168 fig.5).

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OpenTechnical publication OT-2026-000001524
Published 2026-09-15T19:06:26.190004Z
https://opentechnical.org/p/OT-2026-000001524