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A New Two-wheeled SELF-TIPPING TRAILER

14th May 1929, Page 60
14th May 1929
Page 60
Page 61
Page 60, 14th May 1929 — A New Two-wheeled SELF-TIPPING TRAILER
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Which of the following most accurately describes the problem?

FOR many elaSses of work it is essential that discharge of the load carried in a trailer should be effected in a very short space of time and without shovelling or other assistance. Tipping is the obvious , solution and the most popular method of obtaining it is to use a hand-operated gear ; this demands a certain amount of manual labour and time, together with the use of one or two screwed bars, which are subject to considerable wear. The alternative is to use a hydraulic gear, but this, of course, costs considerably more.

To obtain quick tipping action without manual labour or increasing the cost of the vehicle above that which is usual for a hand-operated type a special design has been produced by Mr. W. E. Herbert, works manager of the Harrow Industrial Co., Ltd., Green Lane Works, South Harrow, Middlesex.. It is fully covered by patents. Two machines of this pattern have recently been purchased by United Glass Bottle Manufacturers, Ltd. In this article we deal with the 3-tonner, but other capacities are made to suit customers' requirements.

Dealing with the general construction, there is a drawbar of doublechannel steel with a spacer between the channels. The whole is riveted together and the ends are electric ally welded, the eye also being welded in place and secured to the channel flanges by the bolts which hold the front skid. The last named part can be replaced by a jack support if preferred. Channel members are also employed for the arms which run from the drawbar to the chassis. These have blocks electrically welded to the ends to carry the bearings, whilst the pendant links are solid. When in the position which they assume at the full tipping angle the links allow the end of the.drawbar to abut against a massive steel plate bolted to the chassis; this takes the impact and prevents any possibility of damage 'to the trailer frame or drawbar. Two L-section members are bolted to the frame, and these serve to carry a pin which Is out of action when travelling, or in use to lock the rear end of the drawbar when it is desired to move the vehicle forward with the body in the tipped position, thus clearing the deposited load.

Rolled-steel U-section members are employed for the main frame, which • is suspended on semi-elliptic springs pivoted to east brackets at their forward ends and shackled at the rear.

The axle is of 40-ton steel and carries internal-expanding brakes operated by a horizontal lever on the righthand side of the chassis. The drams are 16 ins. in diameter and a whipple-tree compensator is employed. Twin solid tyres (720 mm". by 120 mm.) are mounted on the doubledisc wheels, which rim on Timken bearings.

Not only is the rear of the vehicle fully insulated from road shocks, but the weight resting upon the drawbar is also sprung upon the reversed semi-elliptic spring .which is pivoted to a bracket on the upper face of the drawbar and shoaled at its rear end. The purpose of this spring is to take the shock when the body is lowered and to ,insulate the forward end. One-third of the weight of the laden vehicle is carried by the tractor, thus increasing its rearwheel adhesion, whilst two-thirds are carried upon the trailer wheels.

The following are the body dimensions of the trailer which we inspected :—Length, 9 ft. 7 ins. ; overall width, 6 ft. 1i ins.; depth, 2 ft. Both sides and the tailboard are hinged. The following dimensions apply to the complete vehicle :—Length, 14 ft. 7 ins.; width, 6 ft. lj ins.; height, 5 ft. 5i ins.; track,. 4 ft. 11 ins. The weight (when empty) was 1 ton 6 cwt. .1 qr., the amount carried upon the trailer axle being 1 ton 1 cwt. 2 qrs. .

A 45-degree angle of tip is obtained In the following manner :—The tractor is brought to rest and the driver applies the trailer brake, afterwards withdrawing the pin which holds the frame down to the single front

spring ; next he reverses the tractor slowly, the trailer wheels remair:ng practically stationary. Owing to the link action the body tips until the end of the drawbar strikes the table bolted to the frame. When the load has been discharged the driver moves the tractor forward until the frame comes to rest on its front spring ; he then inserts the pin, takes off the timiler brake and is ready for the road. If desired, he can pull the trailer forward with the body in the fully tipped position, using the locking pin.

During a short demonstration it was made clear that the trailer can easily be handled by one man with

out previous experience. There is nothing to go wrong and all the bearings on the frame of the trailer are so placed as to be well away from dirt falling from the body. Grease points are provided for every bearing. To obtain the full 45 degrees of tip the tractor had to move back to the extent of 5 ft. 4 ins.

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