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Pulley


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Prince Edward Island Museum and Heritage Foundation
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Nom de l'objet : Pulley
Artiste ou artisan : Watson DuChemin
Catégorie de l'objet : Tools & Equipment for Science & Technology
Sous-catégorie de l'objet : Mechanical T&E
Matériaux : Metal, Iron(?), Brass, Steel(?)
Numéro de catalogue : HF.81.142.1
Numéro d'accession : HF.81.142.1
Date de fin de production : 1865 c
Description : Metal pulley with hook and roller bearings. Tear drop in shape with circular hole in the center and a hook affixed to pointed end. Pulley opens to reveal seventeen cylindrical roller bearings on each side separated by brass spacers.
Commentaires : This is a prototype of the roller bearing block invented and patented by Watson DuChemin (1790-1872), a well known inventor as he also devised the now common place egg carton. DuChemin immigrated to Prince Edward Island from England with his wife Sarah around 1819. His trade was as a pump and block maker for use by sailing vessels. He soon realized that a better block could be achieved by making it entirely out of metal instead of wood and to reduce fiction he incorporated his new invention: the roller bearing. He did away with the traditional style of suspending pulley in a casing and instead surrounded a sheath with close flitting roller bearings to reduce the fiction normally created by lifted large weights. The rollers are cylindrical so the contact between the inner and outer ring is not a single point, as it would be with a ball bearing, but a line. This spreads the load out over a larger area, allowing the bearing to handle much greater loads than a ball bearing.
Hauteur : 15
Longueur : 24
Diamètre extérieur : 16
Unité de mesure linéaire : Centimetre
Établissement : Prince Edward Island Museum and Heritage Foundation  Facebook-Prince Edward Island Museum and Heritage Foundation  Twitter-Prince Edward Island Museum and Heritage Foundation 
Ville de l'établissement : Charlottetown
Province de l'établissement : Prince Edward Island

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