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A Dustproof Control Valve for Tipping Gears
Page 146
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A TIPPING body usually works
under conditions in which dust and grit are in plentiful supply. and it is therefore vital to protect the interior of the hydraulic system. A dustproof control valve for this purpose is shown in patent No. 634,615, by Edwards Bros. (Tippers),:ttd., J. Edge and J. ('osgrove, all of Bradford Street, Bolton, Lancs.
Referring to the drawing, a cast body is bored to receive a hardened plunger which slides to connect an inlet port 42) with one or other of the outlet ports (3). The body is sealed at each end by a flexible can (4):
The plunger is worked by an external lever attached to a simkeil .dik (5); when this is turned, an eccentric pin (6), fitting a grotive in the plunger, causes the sliding motion. A sprung ball (7) engages V-grooves in the pltmgeiso as to give a positive position at each end of the movement. The sunken disc is retained in place by a spring ring (8) housed in a groove in the recess.
A COMBUSTION SYSTEM FOR A TWO-STROKE
ANY and varied are the designs of IVIcombustion heads for two-stroke engines; all of which -ate aimed at
providing the 'best . 'degree. of scavenging • and turbulence. Such a scheme forms the sub-'
ject Of patent No., 634,661. which comes from-A. 2.elezny. Vele-. sin, Czechoslovakia.
This inventor favours the hernispherical head, plus a piston crown to suit. The combustion space is located entirely within the piston and its shape is part of the form generated by a rotating ellipse shown in broken line (I), the axis of rotation passing approximately through the cylinder head.
The inlet ports (2) arelocated on both sides of the piston, and an exhaust port is shown at 3. Complete seavengine )348
of the combustion space is. claimed, and considerable turbulence is set up -at top dead 'centre by the violent
squish" effect , due to the close clearance between piston and head.
RUBBER SUSPENSION FOR HEAVY VEHICLES
iNTENDED chiefly for buses and I coaches, a novel suspension system: 'is is shown in patent No. 634,734, which comes from 0. _Varga and George s Spencer Moulton and Co., Ltd., 13-14, Ashley Place, London, S.W.1: In this scheme, the resilient medium consists entirely of rubber,
The drawing shows a section of the basic unit of the system. The central flange (I) is the moving
with an arm (not shown) uo---/Ilc which extends to the axle °-' --or other unspning part of the vehicle. The pair of ' journal rnem.bers (2) are inclined at an angle as shown, and are enveloped by rubber sleeves (3). The sleeves are each provided with an outer steel shell {4), both of which are firmly held in clamping members (5) attached to the frame of the vehicle by ,bolting flanges "(6). The two clamps are actually part of a single casting, being joined by a crescent shaped girder not shown. -The inclina"lion of the two journals at an angle introduces a " rising rate" into the load-deflection cur v e, which would otherwise be linear due to torsion only.
Whilst the torque arm may be centrally disposed, it can be replaced or supplemented by an arm at one or both ends of the bush journals.
TORSION SPRING OF NEW DESIGN rOMPREHENS I V E
claims are made in patent No. 632.998 for a new design of torsion spring. The patentee. 3. Ramstrom, Vasteras, Sweden, visualizes the spring being used not only for' suspending purposes; but as a propulsive means for shortrange work, with or without other power unitS.
The drawing shows a section of the spring; it 634,734 consists of numerous tubes nested one within the other, and joined at alternate ends, so that the separate lengths add up and form, in effect_ one long tubular mem
her. The inner one is the thickest, and the outer the thinnest, with the intermediates in proportion, so that each tube when stressed stores the same degree of energy.
The scheme is said to be particularly suitable for use with a battery-electric . vehicle, because it can be coupled to the drive and bring the vehicle to a standstill instead of using the normal brakes. The stored energy can then be returned to the vehicle as an accelerating force when next starting, and set ease the load on the batteries. In.dettling with the use of the device as a source" of -power, the :.inventor, compares it with the electric vehicle. The inVeniOr's Spring, which would give shorter rurrs at higher speed, could he "
rewound" in abeidt two minutes and retain.: its `,` charge" nntil required.
A STRONG LIGHT ' ALLOY DA TENT No. 634,870
I refers to aluminium alloys contain:ng magnesium,' and deals with a treatment for increasing their st re n gt h_ The patentee is Acme Mu
minum Alloys Incorporated, Dayton, Ohio, U.S.A.
In particular, the patent relates to an aluminium-magnesium alloy containing about 10 per cent. magnesium, an alloy often used for castings. The standard strength of this mixture is given as ultimate 20 tons per sq. in., yield 11 tons per sq. in., and elongation 13 per cent., but in practice these values have been found to he inconsistent.
The proposed treatment is as follows: while the alloy is in the molten state, it is degasified and scoured by the application of boron-trichloride, a process which, incidentally, adds about 0.01 per cent, of boron to the alloy. The melt is then allowed to settle, after which the casting is poured. After cooling, the casting is next heated to 820 degrees F. for from three to four hours, cooled to 680 degrees F., and then quenched in cold water.
After being aged at room tempera:ture for 90 days, the finished casting is said to have acquired an ultimate of 23 tons per sq. in. and a yield of 12 tons per sq. in., with about 6 per cent. increase in the elongation. Apart from
the increase in strength, the results are said to be consistent and readily reproducible.