Appleby's Illustrated Handbook of Machinery ...: Hoisting machinery, including winding engines, hydraulic, steam and hand cranes, winches and jacks ... 1877

Cover
 

Was andere dazu sagen - Rezension schreiben

Es wurden keine Rezensionen gefunden.

Häufige Begriffe und Wortgruppen

Beliebte Passagen

Seite 87 - LOCOMOTIVE CEANE ENGINE. Made by Aveling & Porter. William Churchill Oastler, sole agent for the United States, 43 Exchange Place, New York. This eugine can be moved from place to place by its own power and draw very heavy loads, a 6 horse-power engine, on trial at South Orange, NJ, in...
Seite 87 - ... intervals as will admit of either line being used for full or empty trucks, or in fact partially for both purposes if desired. Another great advantage which has been demonstrated by practice is, that the cranes can be so readily concentrated at any point where they may be required; and, indeed, as is shown in the engraving, three of these cranes are brought to load a long screw steamer having three hatchways. This is evidently a most important consideration with owners and shippers, especially...
Seite 87 - ... wheels, and they are used for moving the trucks into position below the crane, as they are required for loading and unloading. This simple addition is found to effect a very large saving in manual labor and time, which, it is estimated, amounts to at least £300 per year, because, without this appliance, horses and locomotives must be kept constantly employed, involving working expenses and wear and tear, in addition to the maintenance of the road, whilst with the capstans the trucks are brought...
Seite 147 - To ascertain the size and number of sheaves required to lift a given weight, divide the weight to be lifted by any weight in the above Table ; the result will give the number of sheaves and sizes of blocks required. EXAMPLE — If 60 cwt. is to be lifted, either of the following combinations will be suitable : — A pair of 3 and 3 sheaves, 3 in. at 10 cwt. per sheave or\ „„ 04 l 19 Г »О cw'» ¿ » à *> l .. i*
Seite 57 - ... while the other ends are coupled to the short arms of two bell-crank levers, having a fulcrum in the top of the...
Seite 91 - Those conditions were, that the blocks, each weighing 27 tons, should be lifted, traversed out. and placed in position 25 feet in advance of the point of support afforded by the finished work. The main framing is made throughout of wrought iron, and travels on a pair of rails, 22-ft.
Seite 87 - ... will shortly be referred to, is firmly bolted at the extreme end of the girders nearest to the dock, while the girders are planked over so as to form a store for coal and water. The crane and the whole of the substructure is designed for a working load of 5 tons at the maximum radius of 21 feet from center cf crane-post to the plumb-line of the lifting chain . while Overhead craucw at Mi<ldlt*rtbrou;;li dork*.
Seite 91 - Titan is £2500, the weight 85 tons, and the duty, 6 blocks laid per day, allowing for the time required for the divers to place the blocks under water. The cost of the 10 trucks, which...
Seite 69 - CASTING. of lifting gear, there is a set of geared change wheels and clutches : by these simple means the whole of the travelling and lifting speeds are completely changed, in the proportion of 2 to 1; thus, without disarranging the crane blocks, it gives the lifting speed of six powers, and two speeds of longitudinal and cross travelling, making the traveller, which would in...
Seite 86 - Commissioners for unloading and placing the heavy portion of the exhibits. These cranes can — 1. Lift and lower ; 2. Turn completely round in either direction simultaneously with the lifting or lowering; 3. Alter the radius by raising or lowering the jib-head ; and, 4. Travel along rails by steam; all of these motions being worked by one man who attends to the boiler. The cranes made by this firm which would probably be most useful to engineers are: the portable steam crane with fixed jib, the...

Bibliografische Informationen