Patent GB-243822-A (GB)
Title: Improvements in road-contouring and like apparatus
IPC: G01C7/04
Filed: 1924-09-08
Abstract: 243,822. Evans, W. E., (Williams, J. H.). Sept. 8, 1924. Addition to 227,176. Road-contouring apparatus; course-recording apparatus.-In apparatus of the kind described in the parent Specification, the record sheet is carried on an open frame which can move in a horizontal direction within a bearing frame which is mounted on a horizontal pivot at right-angles to its plane and is maintained in the horizontal position by a pendulum. The apparatus is supported on a carriage a mounted on road wheels b and carrying a base-plate c connected by four equal links d to the carrying frame e of the apparatus, this frame being supported on springs to eliminate the effect of shocks &c. The frame c is formed with downward extensions e<1> to which the links d are pivoted, and which are formed, at points midway between the pivot connections, with bearings e<2> for a spindle f which carries at one end the pendulum g and at the other end a bracket h to which is secured the frame i within which is mounted, so as to be movable horizontally, the frame j carrying the record sheet, this frame j being provided with rollers j<1> which bear on the upper and lower members of the frame i. The record sheet extends between rollers j<6>, j<3> on the frame j and passes over guide rollers j<13>, between which it is actuated by the driving disc l. The upper roller j<6> is provided with spring tensioning- means to maintain the record-sheet taut. The driving disc l is mounted in bearings in lugs l<3> on a bracket l<4> secured to an extension e<3> of the frame e, which also carries an extension m on which is resiliently mounted by means of a pivot m<3> and spring m<4> a forked arm m<2> supporting a roller l<1> which bears on the opposite surface of the record sheet. For rotating the disc l proportionately to the rotation of the wheels b, the spindle l<2> of the disc carries a pinion l<5> gearing with a pinion l<6> which is connected by a universal joint to a shaft l<9> the outer end of which is connected by a universal joint to the spindle of a pinion n<8> gearing with a pinion n<7> secured to the spindle of a worm-wheel n<3> rotated by a worm on a shaft n<5> which is connected by bevel gearing to the axle of one of the wheels b. The ratio of the transmission can be varied by changing the wheels n<7>, n<8>. The shaft n<5> is made in two disconnectible parts, so that the drive can be interrupted at will. The stylus q, Fig. 15, is mounted on a carrier p provided with rollers p<4>, p<5>, Fig. 13, engaging the upper and lower edges of a bar i<3> carried by brackets i' secured to the frame i, the roller p<5> being resiliently mounted to avoid play. Lateral play is avoided by providing rollers p<10> bearing on the lateral face of the bar i<3>. The stylus q is mounted on an arm p<12> which is pivoted to the carrier p and is pressed against the record sheet by a spring p<14>. For imparting to the carrier p the movements of the frame j to an enlarged scale, the frame i is provided at each end with a spindle i<5> supporting a sleeve i<6>, Fig. 11, carrying three pulleys i<7>, i<9> i<10>, around which pass endless bands i<8>, i<11>, i<12> respectively. The band i<8> is secured to the carrier p by clamps p<15>, and either one of the bands i<11>, i<12> can be secured to the frame i by clamps carried by the latter, the ratio of the transmission to the carrier p depending on which of the bands i<11>, i<12> is secured to the frame j.