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Lubrication Means More Deflection

10th March 1950, Page 36
10th March 1950
Page 36
Page 36, 10th March 1950 — Lubrication Means More Deflection
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Which of the following most accurately describes the problem?

THE road transport engineer's probkm of whether or not spring leaves should be lubricated, inspired a special demonstration at the factory of Messrs. T. Harrison iard Sons, Kirkstall Road, Leeds.

This question has been discussed at length in the correspondence columns of " The Commercial Motor," and to satisfy inquiries, identical springs, one dry and the other fully lubricated, were set up for scragging on the hydraulic test bed. Using a well-known type of commercial-vehicle spring made at the Harrison works, it was shown that a greased specimen had nearly fin. greater deflection than that which was dry.

The scragging test, which" is given tp all springs before they leave the works, is calculated to eliminate mechanical faults and detect the presence of soft or mild plates. In a number of cases witnessed, the springs for commercial vehicles were shown to be equal to taking a considerable reverse camber.

The Harrison routine also provides for testing the Brinell hardness of leaves.


niSCUSSIONS have taken place Li between the Ministry of Transport and the British Agricultural Contractors' Association on the establishment of a cfassification to cover bona-fide agricultural contractors to enable them to haul farm produce without paying the heavy commercial rate of taxation.

The B.A.C.A. has asked the Ministry of Agriculture to increase the rates in its examiners' guides to road haulage charges to cover higher casts.


I N view of an estimated deficit of

£87,488 over current financial year, Hull Transport Department has proposed to increase all ld. fares by 4c1. and to raise workmen's fares. The transport committee recently endorsed these proposals.

Coun. A. K. Jacobs said: "1 don't subscribe to the idea that we should carry on with this deficit because we are going to be nationalized in the near future."

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