The Purchase Department.
Page 20
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Where to Buy your Supplies.
The Fitting of the Solid Tire.
The sketch herewith has been drawn from ideas suggested by the B. F. Goodrich Co., Ltd., 117, Golden Lane, E.C. The high quality of this maker's solid tires we have no necessity to emphasize here. We would particularly draw attention, however, to the company's system of fitting its detachable band tires. It will readily be seen that a tire fitted as in the section shown on the right of the sketch cannot
give good service under any conceivable working conditions, and yet there is little doubt that some wagons and vans are in. use whereon solid tires are fitted in this careless and ignorant fashion. The Goodrich Co. claims that its solid band tires cannot be improperly applied. The taper, both on the band itself and on the rims, renders it impossible for a flange to be gripping at one point of the diameter only. When Goodrich tires are used, given, that sufficient pressure is applied to the holding nut, the band and flanges must automatically be forced into the correct position.
The Economical Purchase of Renewals.
A small user can, from time to time, save considet • able money and trouble by the purchase of spare parts and renewals which are, so far as machining and manufacture are concerned, ready to drop into position without expensive fitting. Such parts as bushes for gudgeon pins, gudgeon pins themselves, bearings for certain work, valves and valve caps, and many other component pieces, c.an all be purchased machined to dead size from practically any up-to-date merchant or manufacturer.
The Duplex and General Bearings Co., 45, Angel Street, Long Acre, W.C.' is making quite a feature of its new finished bronze bushes. These consist of colddrawn bronze tubing, made to very fine limits, and ranging in size from in. to 7 ins, outside diameter. These tubes simply require parting off and prefesing in position, with, on occasion, a light touch with a finishing reamer. This system has now been put to an extended test.
Our readers will appreciate the great labour saving in fitting bushes for gudgeon pins, etc. in this way. The same company is also responsible for a range of improved ball-bearings, designated the Duplex, Triplex and Precision.
cI6 Traffic in the Workshop.
The great increase in the production of component parts, rendered possible by the increasing use of auto. matic machine tools, has necessitated the provision of some suitable means for the transport of castings and other metal and raw material from machine to machine. A well-known manufacturer who has specialized in the production of trucks for many work, shop purposes is H. C. Slingsby, 142, Old Street, E.C.
This firm very kindly placed at our disposal, on the occasion of the C.M.U.A. parade on Whit Monday last, a Slingsby truck, which was used for hauling a heavy spraying machine along the Embankment and the surrounding streets for the purpose of marking out many positions and points for the vehicles assembled. The truck impressed us with its clean design and its great strength and handiness.
A New Lock-nut.
Mr. Allen Williams, M.I.E.E., 9, Queen Victoria Street, E.C., has recently brought to our notice a new form of luck-nut and washer, for which he claims reliability and simplicity. As will be seen from the drawings which we reproduce, this nut consists of a thin plate of spring steel having a specially-shaped hole stamped out of the centre. The form of this hole depends upon the diameter of the screw and the pitch of the thread to which the Washer and nut are to be fitted. Its application will be clearly seen from the drawing. As the lock-nut is tightened, the points of the teeth are forced inwards and grip the thread of the bolt firmly, so that any tendency to move on the part of the nut merely increases the pressure between the teeth of the washer and the bolt. These spring lock-nuts are both light and cheap, a consideration which can well be taken notice of by the manufacturer and the user. A further point in favour of this appliance is that it can be used more than once.