Patent GB-495076-A (GB)
Title: Means for recording the travel of hoists
IPC: B66B3/00
Filed: 1937-05-04
Abstract: 495,076. Recording-apparatus. LOGAN, H. H. May 4, 1937, No. 12777. Convention date, May 25, 1936. [Class 106 (iv)] Means for recording the travel of a hoist comprises a time-driven roller, means for holding a chart against the roller, a pen reciprocated by a screw shaft moved according to the movements of the hoist and common means for simultaneously releasing the holding means, stopping the time means and lifting the pen from the chart. A shaft 62 is driven from the hoist mechanism through bevel gearing and carries a pinion 64 engaging a pinion 77 free on the screwed pen-driving shaft 72. The pinion 77 is pressed by a spring 79 against a collar 76 secured to the shaft 72, this arrangement forming a spring coupling to prevent damage to the recorder if the shaft 62 continues to rotate after the pen 98 has reached the end of its travel. The pen is traversed across the record strip by a nut 56 engaging the screwed shaft 72, the pen being carried in a holder 100, pivoted at 101 in a bracket 103 detachably secured to the nut. An extension of the holder 100 rests against a flat on a shaft 107 so that when this shaft is turned by a hand lever 110 the holder is rocked to lift the pen from the paper. The lever 110 also opens a switch (not shown in Fig. 5) to stop the record-strip driving clock when the pen is lifted from the paper. A record strip 20 long enough for one day's working is placed in guides 23, passes over a rubber-covered clock-driven roller 117 and hangs down behind a casing window arranged to expose a considerable part of the strip at one time. No take-up roller is provided, the strip falling in folds in the base of the casing. The roller 11 has adjusting knobs 135 and is driven from a synchronous-motor clock through a pinion 136 connected to the roller shaft by a clutch 137 operated by a knob 138. The record strip is held against the roller 117 by a guide 153 and rollers 166 carried in supports 157 pivoted at 161 and urged anticlockwise by a spring 165. The guide 153 and rollers 166 are moved away from the roller 117 when a shaft 118 having a flat engaging a stirrup abutting an arm 160 of the supports 157 is rocked by a lever 116. This lever is connected by a link 113 to the means which lifts the pen 98 and opens the clock switch. The strip is also held against the roller 117 by rollers 142 carried in brackets 143 mounted on a rod 144, the brackets and rollers 142 being held against the roller 117 because the brackets are normally prevented from turning round the rod 144 by spring-pressed detents 147. The rollers 142 are lifted to release the record strip by turning the brackets 143 by hand round the rod 144. Counting number of hoist operations. The nut 56 carrying the recording pen has an extension 82 which engages an arm 87 on a shaft 84 and rocks this shaft to close contacts 92 in the circuit of a counter 95a. The arm 87 is adjustable along the shaft 84 so that the counter registers the number of times the hoist moves beyond a certain distance. Casing. The apparatus is housed in a casing comprising a front door normally locked and two side doors near the ends of the roller 117 and its adjacent mechanism. These side doors can be opened only from inside the casing.