GB354235A - Improvements relating to ship's derricks and winches for working cargo - Google Patents

Abstract

354,235. Ships' derricks ; winches ; grab-buckets. MACFARLANE, G. T., Pinner, Bangalla Street, Warrawee, near Sydney, Australia. May 5, 1930, No. 13787. [A Specification was laid open to inspection under Sect. 91 of the Acts, May 25, 1930.] [Classes 78 (iv) and 78 (v).] In a loading and unloading system for ships dealing with coal and similar loose cargoes, a derrick on the mast is controlled by a winch having a barrel for the hoisting rope, an independent worm gear driven barrel for a topping lift, and a barrel for slewing guys all under the control of a single operator. Means for opening and closing grabs and for discharging the coal by an elevator into trucks are also provided. The foot of the derrick 23, Fig. 1, is jointed to the mast 25 and its upper end is raised and lowered by the topping lift ropes 28, which are led down to the winch. The grab is raised and lowered by the rope 37 and is closed or opened by the rope 38 in conjunction with a gripping device secured to the mast. The derrick 23 is slewed by side guys 32 secured to the sides of the ship at one end and led over pulleys 31 on the derrick down to the winch. When unloading, coal &c. is discharged by the grab into a bin 147 from which it is raised by a conveyer 148 and is discharged by a shoot 151 into a truck 152. The winch is shown in plan in Fig. 4, and a section on the line 6 .. 6 is shown in Fig. 6. An electromotor or other source of power coupled to the shaft 66, drives the hoisting drum 74 through toothed gearing and also drives the topping lift drum 137 and the slewing drums 131, 132 through a chain 116 and bevel and worm gear. The hoisting drum 74 is associated with epicyclic gear and with brake drums 84, 86 on a shaft 85 in such a way that the load may be raised, held in any position or lowered by a brake; or its speed of descent may be controlled by the rotation of the driving motor. The toothed wheel 71 driven by the motor shaft 66 is keyed to the winch shaft 72, one wheel 75 of the epicyclic gear being keyed to the other end of the shaft. The drum 74 rotates with the toothed wheel 73 and with the other epicyclic wheel 76, the assembly being freely mounted on the shaft 72. The planet pins 77 are carried bv a toothed wheel 80 which meshes with pinions 82 rotatable with the drum 84 which is free on the shaft 85. The wheel 73 meshes with the pinion 87 keyed to the shaft 85 to which the drum 86 is also keyed. When the drum 84 is held by a brake the wheel 80 is also fixed and the drum 74 is driven from the shaft 72 but in the opposite direction through the epicyclic gearing. When the drum 84 is free and the drum 86 held, the winch drum 74 is held stationary or lowered under control through the gearing 73, 87. When both brake drums 84, 86 are free the winch drum 74 is rotated by the load under the control of the motor, the epicyclic gear then being locked by the free wheel mechanism shown in Fig. 11. On the spindle of one or more of the planet pinions 77 is mounted a ratchet wheel 88 which is engaged by a sliding pawl 89 when the winch drum tends to overrun, this pawl forming part of a carrier 90 pressed frictionally by a spring against the end flange 92 of the drum 74. The carrier 90 and pawl 89 may be held clear of the ratchet wheel by a screw 96 so that the winch may turn freely. The topping lift drums 131, 132, Fig. 4, are keyed to a shaft which is rotated as required in either direction by worm gearing operated by a bevel wheel 126 meshing with bevel pinions 124 either of which may be connected by a clutch 12Q to the shaft 118 driven from the motor. The slewing drum 137 is similarly driven in either direction by the bevel gearing 125, 123. The mechanism for controlling the brake drums 84, 86 is shown also in Fig. 8. A transverse spindle 97 is rotated in one direction by a long arm with counterweight 99 so as to apply the brake shoe 114 to the drum 86. The spindle is rotated in the opposite direction by the hand-wheel 112 to release the shoe 114 and apply a sliding shoe 104 to the drum 84 so as to raise the load. When the hand-wheel is rotated in one direction it tightens up the rope 102 which pulls the sliding shoe 104 into engagement, the other end of the rope being attached to a short arm on the shaft 97 so as to release the shoe 114. The hand-wheel may be rotated in the opposite direction to wind up the rope 113 and thus lift the counterweight. Two winches may be combined to operate two derricks simultaneously. The graboperating rope 38 runs over a system of pulleys mounted on the mast and on a weight 43 as shown in Fig. 1. The rope being gripped when required to operate the grab by a gripping device shown in Figs. 15 and 17. The two gripping arms 49, 50 are operated by a screw 51 and toothed wheel 52 engaging a rack 53 which may be adjusted vertically by a steam cylinder 56 or by electromagnets. Specification 128,681, [Class 78 (v), Winding and paying-out apparatus &c.], is referred to.