Image:Pentaspastos

Image:Pentaspastos scheme.svg

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Pentaspastos_scheme.svg‎ (SVG file, nominally 1,520 × 1,370 pixels, file size: 163 KB)

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Summary

Description

Deutsch: Darstellung eines römischen Pentaspastos-Krans. Der Pentaspastos ("5-Rollen-Zug") stellte einen mittelgroßen römischen Krantyp dar. Er bestand aus Hebebaum, zwei Haspeln, einem Seil und einem Flaschenzug mit fünf Rollen. Dies entspricht einer Übersetzung von 5 zu 1. Die zwei Arbeiter an der Haspel konnten - unter der Annahme, dass 50 kg den maximalen Krafteinsatz darstellen, den ein Mann über einen längeren Zeitraum ausüben kann - Lasten von ca. 450 kg heben.

English: Scheme of an ancient Roman Pentaspastos crane ("Five-pulley-crane"). Being a medium-sized Roman crane, the Pentaspastos consisted of a single-beam jib, two winches, a rope, and a block containing five pulleys. Having thus a mechanical advantage of 5:1, the two men working the winch could raise loads of ca. 450 kg, assuming that 50 kg represent the maximum effort a man can exert over a longer time period.

Français : Schéma d'une antique grue romaine du type pentaspastos utilisant cinq poulies.

Source

Own work
Based upon : Dienel, Hans-Liudger & Meighörner, Wolfgang: Der Tretradkran, Publication of the Deutsches Museum (Technikgeschichte Series), 2nd ed., München 1997, p.12f.

Date

June 2008

Author

Eric Gaba (Sting - fr:Sting)

Permission
(Reusing this image)

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Other versions

Trispastos-type crane

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	21:02, 30 June 2008		1,520×1,370 (163 KB)	Sting	(== Summary == {{Information \|Description={{en\|Scheme of an Antic Roman Pentaspastos crane using five pulleys.}} {{fr\|Schéma d'une antique grue romaine du type ''pentaspastos'' utilisant cinq [[f)

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