A SIX-WHEELED CHASSIS.
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Resume of Recently Published Patents.
A six-wheeled chassis is the subject of specification No. 134,273, by C. F. Gros. The aim of the inventor has been that of devising a springing ,systern which will compel the wheels of all the axles to hold the road. in places where the sunface is bad or uneven. The front axle is coupled to the frame of the chassis hy what are described as traction plates: they closely reseanble radius rods. The other two axles are connected together and form a bogie, which is sprung as a whole and independent of the main springing. The rearmost axle is the eteerer.
Two pairs of semi-elliptic springs intervene, one pair between the front axle and the frame, the other between the front end of the bogie and the frame. The front pair is connected to the axle by 171.0arki of shackles, which are attached direct to the axle itself. The butt ends of these eprings are secured to a cross shaft, from which. depends a pair of levers, one at each eider of the .franie. In a similar manner the other pair of springs is attached to the front end of the bogie by shackles, and their butt ends are also fastened to a cross shaft, which ha ls levers at:its extremities also. The two padre of levers are coupled at their outer ends, one to the other, so that the action of the springs is interdependent. When the front. wheel rises to surmount an obstacle, the centre pair of wheels, owing to the notion of these springs, is premed into closer contact with the ground. In a similar manner, when theecentre pair of wheels meets that or any other obstacle, the effecteof its elevation is to tend to depress the front axle, and thus ensure its close contact with the road.
Meantime the bogie is pivoted at its centre to a horizontal shaft, which is secured to the centre of a pair of -long
sprngs which divide the bogie front the flume of the chassis. Conset,Luently,. as flee fronqaxle of the bogicrises or fells' in keeping with the contour of the road surface, the'hind axle falls ; and 'rises Tend vice versa.
The construction of flee-begietated of the Konneetions laetwee J the Jeonte axle and .fraantiare 'such eete llow'consid er able,freedom of onovemere to the wheels of each axle, so thatnaterabinequelities in the road surface are: also cared for in the design. A modified conserpetion is also described in the patent specification which necessitates a special design of frame.
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Detail Improvements. .
A new shape of worm tooth or thread is described in specification No. 154,186, by Percy Brown, of David Brown and Sons (Huddersfield), Ltd. Instead of making the worm thread, as viewed on a section through the axis of the worm, straight, sided, the sides of the thread
are portions of hyperbolae. It is claimed that by the adoption of this section much of the eliding action which. takes place when a worm and wheel are working is eliminated and rolling substituted. The thread of the worm can be cut in any of the ordinary machine& noer employed in the cutting of worms, or it may be cut in theelathe by employing a toot whose shape i$ the required hyperbolic curve. The worm wheel can she be cut in the usual way by means of a hob made to eorrespond with the worm. The inventionof J. M. James and others, which; is described in specification No. 134;277, relates to that type of radiator which is built up of fiat tubing enlarged near the ends and halted up in limits. In previous constructions it has been the custom to bolt the tubes together, using distance pieces, which might be castings or stampings, to separate the tubes one from another, and to provide ,the needful water space. This patentee forms the distance piece from the metal of the tube itself, thus not only cheapening the process of manufacture, but also reducing the weight of the complete radiator. Several constructions are described, and the method of forming a Y-fronted or rounded unit is also illustrated. There are two specifications which are concerned with the construction of gas producer -plants for use on motor vehicles. . Both are -by this same patentees, J. W. Parker and another. The first, No. 134,290, describes an arrangement of, a three-way cock in the induction pipe of the engine, by the use of which petrol may be used for starting the engine, and, by use of the engine power, preparing the plant for -use. The gas may be diverted to the engine when the plant is working. The other patent refee's to the construction of the plant generally, the aim of the mentor in this case being, in part, to make the whole of the plant, and particularly the firehars, etc., accessible. A mm bee of ribs are formed on the outer surface of the firebox, 'did they are surrounded and -covered by" a jacket. Air ea-Jeers through the jacket e and is drawn past the ribs, being heated itself and at the same time cooling .tbe firebox to such an extent, it is claim6d, that there is no need to line the box with refractory material. The member of the second specification is 134.300. No. 134,343 relates to the construction of self-lift tractor ploughe. A star wheel is driven by the land wheel of the plough, which normally rotates 011 the crank pin of a cranked shaft. When the ploughman pulls a. rope a trip lever engages with the star wheel and compels it to turn the cranked shaft and -thus operate the lifting mechanism. The patentee is C. II. Crawley.
No. 134,363, by C. H. Rowe, describes a simple form of packing for the valve stems of a petrel engine, the double purpose of the construction being the prevention of air leaks and Imbrication Of the stems. _ --No. 134,458 relates to the wellieneren Hardy flexible disc joint. The discs are recessed for the reception of the plates which hold the connection bolts, and the load is thus distributed over a comparatively large area -of the discs, and net merely taken by the section surrounding the bolt hole. The patentee is E. J. Hardy.