Patent GB-929497-A (GB)
Title: Paving material spreader
IPC: E01C19/42
Filed: 1960-02-19
Abstract: 929,497. Road surfacing machines. JAEGER MACHINE CO. Feb. 19, 1960 [Nov. 27, 1959], No. 5925/60. Class 107. In a machine for spreading and surfacing road paving material, e.g. concrete, comprising a wheeled truck unit which runs on side forms and supports a screw conveyer spreading unit, a strike-off plate and a reciprocating screed, the working elements may be raised or lowered with respect to the truck unit and the unit and the working elements may be extended to operate on roads of various widths. The truck unit 30 comprises two wheeled side trucks 35, extending longitudinally of the machine, to the ends of which two tubular members 65 are secured by clamps 66. These members extend inwardly and telescope in transverse members 61 which with longitudinal members 63 form the central frame of the unit. The width of the truck unit is increased or decreased by hydraulic pistons 70 which act between the central frame and the side trucks. The screw conveyer spreader unit comprises a telescopic support truss 90 formed by central tubular members 91 within which slide tubes 93. The tubes 93 are attached at their outer ends to conveyer support assemblies 94 secured to upstanding members 85 which slide in vertical guides 80 attached to the front of each side truck 35. The screw conveyer is in two separately driven sections and is supported by the assemblies 94 and a central bracket 101 attached to the support truss 91. The central shaft of each section of the conveyer comprises a shaft 120 of circular section which is driven by an hydraulic motor 115 mounted on the associated support 94 and which telescopes within and drives a hollow shaft 121 which is of square section. The shafts of the screw conveyer extend as the side trusses are moved outwards and additional helical sections 128a may be clamped around the circular shaft 120. The strike-off plate 130 comprises a central support plate 131 which is secured to the truss 90, end support plates 135 which overlap the central plate and are secured at their outer edges to the conveyer support assemblies 94 and edge plate sections 133 and 133a which are adjustably secured to plates 131 and 135 respectively. The conveyer and strike-off plate are raised or lowered by hydraulic ram 160 which turns a shaft 156 to which are attached rocker arms 157 linked to the support truss 90. The screed 32a is mounted transversely of the machine between front and rear wheels 33 and is attached via rocking arms 201 and rock-shaft 200 to a telescopic tube structure 171. This structure is supported at its centre in a pivot assembly 170 and at its outer ends in arcuate slots 191 formed in brackets attached to the side trucks 35. The screed is pivoted by hydraulic rams 240 which swing the structure about the pivot 170. The screed is raised by an hydraulic ram arrangement which turns the rock-shaft 200. In use the screed rests on side forms 34 and is reciprocated by an hydraulic motor acting on the screed via a pitman arrangement. An hydraulic drive motor is provided for the wheels of each side truck 35. Specification 929,498 is referred to.