81 DYSON

22nd September 1972, Page 139

22nd September 1972

Page 139

Page 139, 22nd September 1972 — 81 DYSON

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R. A. Dyson and Co Ltd, 76/80 Grafton Street, Liverpool L8 6RH.

Four trailers and a tandem-axle air-suspension bogie plated to 18 tons are shown on the Dyson stand.

A purpose-built trailer plated at 16 tons gross trailer weight and having a 3ft 7in. platform height is the only drawbar exhibit on the stand. It is 18ft long by 8ft wide, and a maximum payload capacity of 13 tons is possible within the range depending on platform length.

The main frame incorporates three-piece fabricated I-beams 12in. deep by 4in. wide and nine channel section cross-members which pass through, . and are welded to the main-members at equal centres between the end-members.

The suspension is the same at each axle except that the front springs are underslung for minimum loading height. The ROR 20,000 series tubular axles are connected to free-ended multi-leaf springs and located by rubber-bushed radius rods. Brakes are 12.25in. by 7in. and are S-cam actuated. Twin 8.25 — 15.00 tyres are fitted at each axle. A double row ballbearing turntable is used to obtain good trailing characteristics and easier handling at depots. With one-man operation in mind the drawbar is fitted with a detachable adjusting sdrew support for drawbar height setting when coupling.

A dual-plated detachable crank low-loading semi-trailer which has 25 tons payload capacity for special purposes and operates at 27.5 tons trailer gross weight within Construction and Use Regulations is on the stand. ,Offering a payload capacity of 21.5 tons within C and U Regs depending on tractive unit, the trailer has an overall length of 40ft 3in., a lower deck length of 22ft and is 8ft wide. Height of the lower deck from the ground is 2ft. Ramping ledges built into the side-members facilitate side loading.

For front loading, the gooseneck may be removed, allowing the front of the deck to be lowered to the ground.

The chassis uses a four main-member design: the main deck and rear deck are floored with hardwood boards, the front deck with steel chequer plate. Hinged outriggers fitted along the lower deck side-members swing out to increase effective deck width to 9ft 6in.

Running gear is the tandem-axle four-spring type incorporating slipper-ended laminated steel springs with equalizer beams and rubber-bushed radius rods. ROR 22,000 series axles are fitted as is 10.00 — 20.00 tyre equipment in twin formation. The bogie is plated to 18 tons within C and U Regs.

Trailer options include a detachable rear end so that the trailer deck may be lowered completely to the ground.

Another chassis shown is purpose-built for psv bodies. The step-frame, single-axle chassis is fabricated from rolled steel sections.

The ROR axle rated at 22,000lb is equipped with 9.00 — 20.00 tyres in twin formation and mounted to the chassis via semi-elliptical springs which incorporate Metalastik rubber-bonded shackle pins secured to cast steel -hanger brackets.

The semi-trailer is 29ft 3in. long and 8ft wide. The bodywork is all metal, with 0.187in. aluminium chequer plate floors; 18 gauge aluminium roof, exterior and interior panels — the remainder is steel.

The trailer chassis has a capacity of 9 tons, is available with various seating capacities, layouts and seat types and the Show model has been designed for operation in the Middle East to accommodate 58/60 persons.

Tile final exhibit is a 30 tons capacity logging bogie mounted pick-a-back-style on Dyson logging bodywork that is supplied as a unitized assembly for a suitable tractive unit.

The bogie has a direct load capacity of 40,000lb which permits a total log load of over 30 tons with a suitable tractive unit. It is fabricated from steel sections and is fitted with a 10ft-wide swivelling bolster with 4ft 6in.-high box section hinged fall-away stanchions.

The bogie is equipped with a long reach pole which can be coupled to the rear of the tractive unit for steering. The reach pole is tubular and the bogie can be adjusted along it to give varying bolster centres. To compensate for varying reach pole lengths when negotiating corners (the load is carried by the swivelling bolsters) the pole is fitted with a sliding towing eye.

The suspension is the Dyson unsprung rubber-mounted walking-beam-type which is fitted with Dyson heavy-duty axles with twin 11 .00 — 20.00 tyre equipment.

Brakes on all wheels are actuated by a two-line air system.

Finally, Dyson is exhibiting tandem-axle air suspension running gear for fitment to tanks and .specialized bodywork. The unit on display is plated at 18 tons and provides the advantages of air suspension with a good degree of articulation between axles. A further feature is the stability offered by a special built-in anti-roll device which comprises sandwich-type bonded steel and rubber buffers which can be adjusted to give the required resistance to roll.

The ROR 22,000 6ft 6in.-wide track tubular axles are fitted with 15.5in. by 7in.

S-earn operated brakes and a load-sensing valve is fitted centrally. Tyre equipment is 18.00— 19.5 (18-ply) big singles.