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Twin In-line from Brockhouse
Page 118
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INDEPENDENT trailers and semi-trailers with twinoscillating axle arrangements were made by J. Brockhouse and Co., Ltd., for many years up to 1939. Since the end of the war only one unit with this layout has been produced, but now the company have re-entered this particular market with a new 15-ton model— • the 4-15. An example is to be exhibited at the Commercial Motor Show.
Each axle is carried on a trailing link pivoted at the front end on widely spaced bearings mounted on the underside of a full-width hollow box-section cross-beam, welded to the frame side-members. The only suspension media are Aeon pillow-type hollow rubber springs, one being mounted on the frame above each trailing link and on the centre line of the axles. Rebound is restricted by steel cables behind the springs and there is provision for the fitting of dampers at the ends of the links. The axles are at 4-ft. 3-in, centres and the pairs of wheels at 2-ft. 4-in. centres. The axles are mounted on the underside of the trailing links in bearings which allow for lateral oseillatioi Stops restrict this to 100 on either side of the verticai Girling 15.25 in. by 4.25 in. two-leading-shoe brakes ar employed (the standard braking system is air-pressure assisted hydraulic) and the tyres are 10.00-20, 16-ply.
Pressed-steel frame side-members by John Thompsoi Motor Pressings, Ltd., or Rubery Owen, Ltd., and pressed steel cross-.members and outriggers give a clean appearanc to the semi-trailer. The side-members are 15 in. dee] reducing to 7.375 in. from behind the coupling plate an
in. thick. Above the box-member carrying the trailing link pivots, and above the rubber spring location, larg. gusset plates are welded to the inside of the frame and th• members. Support for the fifth-wheel coupling plate i given by two frame cross-members and a full-width fron cross-member. The landing gear employed on the semi trailer is the new Model VG450 wind-down leg gear fron Davies Magnet Works, Ltd. These are available in single or two-speed form and are produced in a fabricated desigi using square-section, steel casings and support tubes.
Fabricated corner posts support the front timber head board, which also carries the braking system units. Thes are mounted as a unit on the front of the headboard am comprise a Clayton Dewandre air-pressure servo am valves, a hydraulic master cylinder and the fluid eontaine2
Standard length of the semi-trailer is 25 ft., but an: length up to 28 ft. (the maximum length obtainable of th• side-member pressings) and 7 ft. 6 in. or 8 ft. widths can b obtained. The side rails are of 6.5-in.-deep rolled-stec section, and these are welded to the frame outriggers t■ suit the operator's requirements—to give a flush floor or ; raised edge, and so on. The platform height depends oi the thickness of flooring timber, but will be about 4 ft. 6 in at the front and 4 ft. 3 in. at the rear of the platform.
Other items of standard equipment are flashing directioi indicators, stop and tail lights and reflectors.