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Title: |
1921 Image-Robey & Co. Ltd., Light Weight Tandem Steam Rollers |
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Source: |
The Engineer Magazine, 23 Dec 1921, pg. 678 |
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Insert Date: |
1/1/2013 2:11:47 PM |
Tandem Steam Road Roller
In the account of the Public Works, Roads and Transport Exhibition, which appeared in our issue of November 25th. We briefly mentioned that Robey and Co., Limited, of Lincoln, were exhibiting a lightweight tandem steamroller possessing some novel features. We are now enabled to illustrate the machine in the accompanying engravings. The machine is interesting in several respects, and not
least on account of the frame work, which as will be observed, is of quite unusual design. Furthermore, the engine, boiler. &c., are identical with those which the firm uses for its steam wagon and which are standardized.
The boiler in of the locomotive type with a round ?re-box riveted to it, but there are no stays. It in furnished with forty-one tubes 1¾ in diameter and the total heating surface is 78.17 square feet, the grate area being 3.14 square feet. The engine, which is mounted on the top of the boiler, is of the horizontal compound type with cylinders 4in. and 7¼in. in diameter arranged side by side and having a. stroke of 7in. The valves are of the piston type. With a. boiler pressure of 200 lb. per square inch and at a speed of 430 revolutions per minute the horsepower developed in given an being 25. The engine speed is reduced by gearing, the final drive on to the rear axle being; by roller chain. The travelling speed is 4 miles per hour.
The roller is made in two sizes, which weigh 5 and 6 tons respectively. The driven roller wheels are 3ft. 7¼in. in diameter and 3ft. 8in. wide. The steering wheels are of the same width, but only 2ft. 6in. in diameter. The rims of the hind wheels are renewable, being only bolted to the spokes. As the wheels are arranged tandem, the total width rolled is, of course, also 3ft. 8in. The steering is effected by means of a hand wheel arranged in front of the driver and operating through a worm and quadrant. The capacity of the water tank is 40 gallons, and two methods of feeding the boiler are provided, one being by means of a force pump, which can be worked while the roller is standing and the other by means of an injector. The overall length of the roller is 12ft. 9in.
Image Courtesy of Grace's Guide
http://www.gracesguide.co.uk/File:Im1921EnV132-p678.jpg |
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1921 Robey & Co. Ltd., Light Weight Tandem Steam Rollers
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