Bois d'oeuvre, sa fabrication et sa distribution . e, c'est une machine plus polyvalente et est préféré par beaucoup. Toutes ces formes gèrent le bois d'oeuvre et les bois d'oeuvre en unités. Grue en porte-à-faux.—un type de grue en porte-à-faux, appelée grue Samson, est illustré à la Fig. 113. Il est doté d'une flèche à contrepoids, souvent d'une longueur de 70 pieds ou plus, qui, avec les différents tambours et LE TRANSPORT de puissance AUTOUR DE la CENTRALE 149 dispositifs logés dans une cabine, est monté sur une base tournante qui en principe fait basculer la flèche dans un cercle complet. Un chariot est placé sur le côté inférieur de la flèche et peut être acheminé entre le thecab et le t

• Contributeur: The Reading Room / Alamy Banque D'Images
• ID de l’image: 2AXGP9D
• Taille du fichier: 7,2 MB (430,3 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 2108 x 1186 px | 35,7 x 20,1 cm | 14,1 x 7,9 inches | 150dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

Lumber, its manufacture and distribution . e, it is a more versatile machine and is preferred bymany. All of these forms handle lumber and timbers in units. Cantilever Crane.—One type of cantilever crane, known as theSamson crane, is shown in Fig. 113. It has a counter-weighted boom, often 70 feet or more in length, which, with the various drums and power TRANSPORTATION ABOUT THE PLANT 149 devices housed in a cab, is mounted on a revolving base which permitsthe boom to swing in a complete circle. A trolley is placed on theunder side of the boom and may be run back and forth between thecab and the end of the boom by means of cables. The loading linewhich runs from the cab through the trolley has a hook, tongs, or someother grappling device on the free end for handling lumber packagesor timbers. The crane travels on a track having a gauge of 16 feet ormore and the legs are long enough so that there is sufficient clearanceabove the rail to permit a freight car to pass underneath. This machineis built in 5- and 10-ton capacities.. Photograph by Colby Steel and Engineering Co. Fig. 113.—A Samson Cantilever Crane with a 76-foot Boom, operating on theDock of a Puget Sound Sawmill. It is used both to store Lumber and todeliver it to the Ships Tackle, and has a 10-ton Lifting Capacity at a 35-footRadius, 5-ton Capacity at a 70-foot Radius, and a 4-ton Capacity at a 76-footRadius. The power for operating the Samson crane is electricity, about50 horse-power being required for a 10-ton crane. It is claimed bymanufacturers that 492, 000 board feet of lumber have been handledin eight hours with a crew of two men. The storage capacity of a yardwhen a machine of this kind is used is said to be 850, 000 board feetper 100 linear feet of track. These cranes are especially serviceableat cargo mills, since the product can be delivered on board the vesselin large units. It does not require as much track space as the Gantrytype mentioned later. A stationary cantilever-arm crane is someti

Recherche dans la banque de photos par tags

• bookcentury1900
• bookdecade1920
• bookpublishernewyo
• bookyear1922