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A Novel Device for Coupling Trailers to • Tractors.

10th July 1928, Page 110
10th July 1928
Page 110
Page 110, 10th July 1928 — A Novel Device for Coupling Trailers to • Tractors.
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Which of the following most accurately describes the problem?

THE device shown in specification No. 291,587 by the Eagle Engineering Co.,. of Warwick, and W. H. Meats, is intended for use with trailers of the four-wheeled type, its main object being to increase the proportion of weight borne by the tractor while it is pulling up hill or resisting

the trailer while descending hills, etc. The upper view represents the trailer and tractor running under ordinary circumstances, where the pull is not excessive, the pull bar of the trailer being fixed to the tractor as low down as possible to prevent the latter from rearing.

It will be seen that the draw bar is attached to the axle of the trailer by means of a spring, which can compress when the draw-bar pull becomes excessive, as shown in the

lower view, where it may be noticed that a roller has come into contact with an incline which has the effect of tending to depress the bar and so increase the weight it brings to bear on the tractor. A similar incline contacts with the roller when the trailer tends to overrun its tractor. A screw is provided by means of which the distance apart of the two inclines can be regulated.

A Novel Form of Ball-bearing.

TilE form of ball bearing which is deacribed in patent specification No. 289,015, by Karl Leon, of Lidkoping,, Sweden, introduces some new features in hall bearing construction, but it does not impress us as being the product of one who thoroughly grasps the conditions which often prevail when such bearings are at work. The main feature of the bearing would appear to lie in the fact that the balls have flat places on both sides; thests. fiats are provided in order that the balls can be introduced, by turning them as shown on the right so that they will pass through a narrower space between the inner and the outer rings while being assembled. A central ring and two outer rings form the cage and can be connected by means of rivets as shown in the left-hand view.

. So far, the invention would appear to have some merit, as it would enable the space through which the balls are introduced to be less than with completely spherical balls. it should, however, be remembered that balls in a bearing do not at all times receive a pressure at right angles to the axis of the shaft. In many cases there is a certain amount of end thrust to be borne by the balls, in which ease they alter the axis on which they revolve from one parallel. to the axis of the shaft to one at an angle. With the arrange-. meat shown this would not be possible,

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