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LOAD HANDLING HE EASY WAY
Page 86
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Page 88
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DURING the years since the war, whilst certain developments and improvements have been effected in tipping gears, other loading and unloading devices have been mainly restricted to tailboard hoists.
The Burtonwood hoi:.t, manufactured by the Burtonwood Engineering Co., Ltd., The Hyde, London, N.W.9. is of a simple type, operated Through a selfsustaining and braking hand winch. Cables raise or lower mild-steel runners moving on ball races in the pillars. It is available for 10-cwt. and 1-ton loads. A side loader is also available.
A sell-contained loader, the Corbett, is made by R. A. Corbett and Co., Ltd., Burgess Hill, Sussex. It is attached to the lorry tailboard and operated by means of a hydraulic ram, the pump being driven by a small petrol engine. The platform moves on a vertical guide 'and can handle loads of up to 7 cwt.
In the Anthony hpist the platform. which also forms the tailboard, is a magnesium casting operated by a single ram, as shown in an accompanying illustration. It is the product of Anthony Hoists, Ltd., Braintree Road, South Ruislip, Middlesex, and has a lifting capacity of 18 cwt. The maker also constructs an underbody, slanttype tipping gear with a single ram and a range of 6-10 tons. The " piston " carries four automotive-type rings, and there are no cup leathers. Pressure is obtained from a gear-type pump mounted on the cylinder base, so that `there are no high-pressure pipes—in fact, the only pipe is the low-pressure return, welded to the cylinder.
Combining Tank and Cylinder
One of the specialities of Edwards Bros. (Tippers). Ltd., Bradford Street, Bohan, is the Edbrost telescopic, slanttype end-tipper, in which the tank is combined with the cylinder, thus reducing piping to the minimum. The popular model EH2 has a load capacity of 9 tons and weighs only 3,1 cwt. A feature is that no sub-frame is used, the gear bolting into the main frame channels.
The Edbro pump is unusual, being a six-cylindered, swash-plate type with hardened and ground pistons and ball thrust rates
The same company produces other tipping models, including twin-ram types with separate tanks. In these, the upper connection is by ball joints E8 with split housings. A type for fitting behind the cab is still popular, and on singleand twin-cylindered versions of this the swivelling base forms he tank.
A wide range of end and three-way tipping gears is produced by Bromilow and Edwards, Lid.. Foundry Street, .Bolton. The three-way type has twin rams amidships, these being pivoted together in a rocking frame.
There are also twin behind-the-cab
nydraulic models and a front ram endtipper for a long-wheelbase chassis having a 12-ft. body. The mounting of this is arranged to give great stability to the body, to which it is connected by a spherical device. There is a new rearhinge arrangement giving the greatest possible width of support, thus keeping the body square with the under frame.
Another end-tipping gear is designed for arduous operation overseas or for work with outcrop coal. This has a horizontal cylinder with a cross-head at the end of the ram and two sets of rollers, one pair running on the frame and the other pair actuating cams on the body. The whole gear is housed in a stout sub-frame, so that not only can it be easily fitted. but it reinforces the chassis. The body cams have a progressive contour which gives the slowest speed of tip at the commencement and speeds it up as the angle of tip increases.
The company maes a double-acting triple-telescopic gear for extra-heavy tippers, such as the Euclid, and capable of dealing with 80 tons. The travel is about 3 ft. 6 ins., and the gear is intended to fit close to the hinge to give a 60-degree tip.
Wood Hoists, Ltd., of the same address, builds its well-known subframe-type gear with slant cylinder, the angle of which imposes the load on the sub-frame in a horizontal direction, so that the chassis is not directly stressed.
Of great interest is the twin-ram Telehoist, made by W. W. Jenkins (Cheltenham), Ltd., Telehoist Works, Swindon Lane, Cheltenham, which was seen at the Commercial Motor Show fitted to a large Scammell. This gives such a high angle of tip-74 degrees— that a small additional cylinder is provided to return the body.
The largest gear made by the Spenborough Engineering Co., Ltd., Valley Works, Heckmondwike, is an 8-ton, twin-ram, telescopic, underbody type for a 12-ft. body. A special frame unit clamps on to the chassis, and a tipping angle of 42 degrees is given. There is nothing below the level of the chassis with the exception of the six-piston, swash-plate pump in a small tank: it makes a compact unit.
The company has developed a new taildoor, the lower third of which is locked by the upper. The bottom part is supported by sprung chains to relieve shock on the fastenings.
It was interesting to learn from this company that there is still a good salt for screw-type gears—mainly in the agricultural field.
The type illustrated is a three-way hydraulic with a single telescopic ram on a separate frame, whilst for the Bedford long-wheelbase chassis with a
13-ft. body there is a behind-the-cab model.
Pilot Works, Ltd.; Manchester Road, Bolton, specializes in hydraulic gears and is particularly proud of its rotary pump designed to give consistent service under high pressures. The gear spindles are carried in four ball bearings, and phosphor-bronze side plates are interposed between the sides of the pinions and the races. Lubrication is under pressure, and a small relief port in one of the side plates protects the cover plate from excessive pressure. The elimination of valves removes a source of possible failure, and the pump is combined with oa gearbox power takeoff.
For Short-wheelbase Models For loads up to 6 tons, there is a simple, horizontal, underbody model in which the piston, at its maximum stroke, uncovers a relief port. whilst excess oil above it is released in a similar manner by gravity from another port below. The ram end pivots on, roughly, the centre of a double-sided, triangular beam hinged at its lower end; the upper end carries rollers running on the inside of a track mounted under the body. This is suitable for all shortwheelbase vehicles.
One Pilot improvement in connection with underbody twin rams is to mount them initially with a slant towards the rear. This not only increases the ground
clearance, but considerably reduces the loading stress.
Three-way hydraulic gears, with capacities up to 18 tons and weighing as-little as 12 cwt. are built. The larger models have twin telescopic rams mounted on a rocking frame under the body.
An interesting feature of the new twin-ram gear built by Weston Works (Birmingham). Ltd., Greet, Birmingham, 11, is that the cup washers are in the cylinders instead of on the rams. Designed for bodies of 5-cubic-yds. capacity, the rams are not telescopic. Operation of Weston gears is by a fourcylindered, piston-type pump formed as a unit with the gearbox .power take-off. Weston tipping gears are made in
several other types for mounting behind the cab or under the body, Eagle Engineering Co.. Ltd.. Warwick, is a well-known maker of hydraulic tipping gears. A speciality is twin-ram gears for heavy-duty vehicles.
Screw-type tipping gears for hand operation are manufactured by William E. Cary, Ltd., Red Bank, Manchester, 4, and known as the Reliance. They are telescopic and particularly suitable for trailer work.
Another supplier is John Perks and Son (Forgings), Ltd., Crown Works, Lye, Stourbridge. This gear is known as the Perkson. It also is a telescopic type.
There are other interesting methods of dealing with loads, particularly those of an awkward and heavy nature. The ordinary tipping of a vehicle is obviously more suitable for loose materials, such as gravel, sand and beer, One way is to use a low-built trailer or semi-trailer with the rear so arranged that it can be jacked up, the back axle run out with its wheels, the platform again lowered, and stout ramps fitted up which the load can be winched. One of these, which was exhibited at the September Show, was a Hands semitrailer coupled to a Cornmer and built for Gresham Transformers, Ltd., for the loading and unloading of heavy engineering parts. The maker is Hands (Letchworth), Ltd.. New leknield Way, Letchworth, Herts.
Another exhibit was the Lolode machine of the Low Loading Trailer Co., Ltd., Bedford, which operates on a similar principle.
Then there is the Carrimore tilting floor trailer, made by Carrimore Six Wheelers, Ltd.. Great North Road, Finchley, London, N.12, This does not require the use of jacks, as it is balanced that it tilts and returns.
A type of unloading device which was extremely popular for some years is now seldom seen. We refer to the moving floor, of which there were several makes. These were not loaders in the strict sense of the term, but they did help greatly in stowing heavy articles or in bringing them to the back
of the vehicle for unloading. They could also be employed for loose material and refuse. In at least one of these, sections of the floor rose arid passed over the others. In other models the floor formed a kind of continuous band which was usually rotated by a hand-operated gear.