CHASE TRACTOR DEVELOPMENTS.
Page 14
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This Machine is Now Manufactured in Canada in Two Models of 9-18 and 12-25 h.p.
THE CHAS TRACTOR, which has obtained a very satisfactory reputation in the, U.S.A., and which was first designed in 1804, is now being manufactured by Chase Tractors Corporation, Ltd., Toronto, Canada, the London office being at 1, Regent Street,
The tractor is made in two models, and an example was shown at the Royal Show recently held at Darlington. Very little alteration has been made in the original design, the chief aimprovearient being in the quality of the materials.
Apart from the two larger tractors, the company manufacture 'a small 4 h.p. cultivator for orchards and similar work. The tractor they recommend most, particularly is the 12-25 h.p. model, and this is the one we propose to deseiibe in detail.
The Chase tractor is such a simple machine that it ought to appeal partials. laaly to those farmers who have not the services of specially trained men. It is of the thsee-wheel type the single for-ward wheel being contained in bicycle type forks, and the steering is by means of a worm and sector, the sector being N. bolted direct to the top of the frontwheel forks. 4. universal joint connects the steering worm to the long shaft extending from the steering wheel. No differential is provided, and thus both the rear driving wheels get equal power without any tendency for one to slip— an important point, particularly when the tractor is operating in soft ground.
In order to allow for turning, the
power is released from either internal gear final drive pinion by means of a clutch, the whole'of the .driving being then done by the other wheel. Incidentally, the Chase can turn in a 42 ft. circle, which renders it particularly useful for work on. narrow headlands.
Stout, etructural tteel members are employed for the building up of the frame, this component being rigidly braced and well giisseted.
The power unit, which is a. four-cylinderede. heavy-duty Buda, is disposed across the frame, and is mounted on a three-point auspension system. The boas and stroke are 44, ins. and 5 ins. ' 'respectively. The exhaust and intake manifolds are cast in one piece, thus warming the mixture very thoroughly alter the engine has been running for a short time; the good vaporization then. obtained permits the use of paraffin without allowing it to enter the cylinder9 in a liquid form and thua dilute the lubricating oil. A pump of the gear type supplies oil under pressure to all the crankshaft'hearings, and through them into the drilled crankshaft and to the big-ends. The other portions of the
engine are lubricated by splash. All the oil entering the pump passes through a large filter, both this and the pump
'being readily accessible for cleaning. , A water pump of large dimensions enf seres .adequate cooling water circulation through a radiator lef the Perfex type, which is mounted on a. separate frame,. member in order to protect it against torsional stresses. For the air supply to the carburetter a large washer of the wet type is employed, the air, after leaving the washer, passing through a beating chamber! before entering Abe carburettor; in spite of this it remains humid, which is an advantage when paraffin is used as a fuel. The clutch, which is Situated at the off 'aide of the engine, is of the expanding shoe 'type, provided with a simple means of adjustment, and an extension of the 'clutch shaft carries the driving sprocket for the chain and a belt pulley for driving farm machinery. The chain driving the intermediate goarAaft is enclosed in an oil-tight case, as is also the transmission gearing.
When operating in high or low gear, only two pinions are in mesh and when operating in reverse only three pinions. Owing ta the mounting of the engine, no bevel gears whatever have been ens., ployed in the transmission. The ahaft which carries the high and low speed gears in, the transmission, extends through the case of the latter and carries at its outer ends the spur pinions which mesh with the internal-toothed rings bolted to the Wheels.
Owing to the location of the belt pb u ley, it is a .simple matter to take up any slack in the belt, when driving stationary machinery, by merely reversingthe tractor for a shaft distance, The Chase tractor 'being built very low, can be employed on work under trees, and when working across, hills its low centre of gravity eliminates any risk of overtearaing.