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For DRIVERS MECHANICS & FOREMEN.

26th September 1918
Page 21
Page 21, 26th September 1918 — For DRIVERS MECHANICS & FOREMEN.
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Which of the following most accurately describes the problem?

A PRIZE Oil' TEN SHILLINGS is awarded each week to the sender of the best letter which we publish on this page; all others are paid for at the rate ot a penny a line, with an allowance for photographs, AR notes are edited before being • published. Mention your employer's 1141128, in confidence, as evidence of good faith. Address, A, M. and F., "The

Commercial Motor," 7-15, Rosebery Avenue, London, E.C. 1.

Lamps Alight.

On Saturday, the 28th September, light your lamps at 7.16 in London, 7.55 in Edinburgh, 7.19 in Newcastle 7.26 in Liverpool, 7.21 in Birmingham, 7.25 in Bristol, and 8.9 in Dublin.

An Unusual Chain Trouble.

The sender of the following communication has been awardedthe 10s, prize this week.

[1900] " T.B." (Bradford) writes :—" I recently had a new driving chain fitted to my wagon, with which I had a lot of trouble from an unusual cause. Apparently some of the rivets of the chain were not quite so long as they should have been, with the result that they were not riveted over properly on the outside of the links. In consequence, after a few weeks running, several of the side plates became loose, one

or two of them dropped off, and the chain came uncoupled. Fortunately, when this happened, I was travelling along a fairly level road, and had no difficulty in pulling the wagon up with the band brake on the rear axle.

"My first effort was directed towards re-riveting the chain, •with a view to preventing a repetition of this trouble, but the more I hammered the rivets the worse they appeared to be, and I came to the conclusion finally that I should have to devise some method of holding the links tight against the shoulders of the rivets while I hammered the ends of the latter over. To accomplish this end I made a little clamp, as is shown on the accompanying sketch (We have had it redrawn.—En.). Two pieces of mild steel, one on each side of the chain link, are coupled by square shanked bolts. With the aid of this little tool I was able to make a sound job of the re-riveting, and have had no trouble with the chain since.

"It will be noted that with the links firmly held down on to the shoulders of the rivets the need for a second hammer to assist with the riveting does not arise."

For Removing and Replacing Piston Rings.

[1901] " H.H." (Wigan) writes :—" The removal and replacement of piston rings is one df the periodical operations which present themselves to the mechanic, and fortunate is be who can claim an unblemished record in respect of rings broken while handling them in file course of that operation. Yet with ordinary care there should seldom be any such . breakages. Fingers and thumbs alone can do the work, but it can be facilitated and expedited very considerably by the use of some simple contrivance, and generally the latter is of the kind that is best manufactured by the mechanic himself from the semi% of stock-which are usually available even in the least pretentious of garages.

"Perhaps the most efficient outfit for the purpose is one which I saw illustrated in one of the American journals some time ago ; I kept a cutting of the sketches which accompanied the 1.description, and enclose it. We reproduce it herewith.—En.] Any evidence of its origin is lost. but I fancy it was published in the now defunct Horseless Age.'

"The material required for the construction of the apparatus consists of one piece of thin sheet steel about 12it ins. by 51i ins.l_a short tension spring, and a foot of light chain. The sheet steel is cut to the shape shown in Fig 1. The dimensions given evidently relate to some particular piston size ; the reader will realize that they may require modification to suit his purposes. The projections at the top are bent over at right angles to the main sheet, and the whole then made to conform to the cylindrical shape shown in the plan view. "How to use the tool for removing rings is shown in Fig. 3. The point of the cylindrical piece of sheet metal is inserted in the gap which may. be formed between ring and piston by pressing ring against piston at one point. The sleeve may then be pushed further along, taking up each ring in turn, until they are all on its outside. Rings and sleeve may then be withdrawn together. Replacement is equally, as simple, being the reverse process. Convey the ring, on'the sleeve, to the piston ; hold sleeve and ring in position with the latter over the groove which it is desired to fill, and then, holding the ring, withdraw the sleeve, and the ring will slip into place.

" The purpose of the chain and spring, which are made up as shown in Fig. 2, is to facilitate the replacement of piston and rings in the cylinder. The method of performing this operation is in part depicted by Fig. 4. The rings are placed in position in their grooves on the piston, the sleeve is put over them, and compressed by means of the spring and chain, which are wrapped round it. The whole is then presented to the cylinder with the flange of the sleeve against that of the cylinder, and the piston, with r'ngs, pushed through it into place, as in. Fig. 5."


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