ivall Autoweigh irtable weighbridges
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.roducing its newly developed porteighing device, the Davall Gear Co. aims to have overcome most of the ns hitherto associated with low-cost e devices.
Davall Autoweigh utilizes an hydload-cell linked to a Bourden tube, s in turn geared to a sweep hand.
models are available. The first is :tely portable and comprises a luminiuna framework in which the II is centrally mounted. The neck of d-cell piston is hollow and accepts a i. stainless-steel ball captive in the )f the load plate. This provides a lely universal mounting so that load d on the load-plate is accurately itted to the cell, irrespective of the n of a road wheel on the plate.
return valves are included in the Iic circuit, eliminating the need for a cede, the friction of which can cause age to read inaccurately. The mechis unaffected by vibration and will tely weigh a vehicle being driven over the load-plate.
enable vehicles to be kept quite level being weighed, dummy frames are tl complete with lead-up and de: ramps. These are all of caste-alumiInd so designed that a complete as of any number of units can be
picked up and carried without being dismantled by two men. The portable Autoweigh costs £7 9s per unit—two must be used together—and the ramp assemblies cost £6 lOs for each dummy and £6 for each ramp.
In the alternative model the unit is a permanent installation. A pair of load-cell units mounted in their alloy frames are sunk into the ground, the cells being piped to gauges mounted in a convenient, raised position so that a driver can read them from his cab. Davall provides full instructions and drawings for operators to carry out their own installations. The load-plate stem is carried on a parallel roller instead of a ball and the plates of the two units are rigidly mounted in an inverted channel iron beam. A system of light signals is available by which a driver can tell when his vehicle reaches the central position on the bridge. But as the system will accurately weigh a vehicle while it is moving, these might be considered an unnecessary complication.
The cost of a permanent unit, before installation but complete with two standard gauges and sufficient piping to position the bridge 2ft from the wall on which the gauges are mounted, is £290. For a further £27 13s, waterproof gauges can be supplied. The company hires installation engineers for £2 per hour plus expenses.