GB606934A - Improvements in drag-line excavators - Google Patents

Abstract

606,934. Drag-line excavators. WILKINS, E. G. Jan. 22, 1946, Nos. 2104 and 5843. [Class 68 (i)] In a drag-line excavator the tipping of the bucket is controlled by the dragline cable having a portion or an attachment secured at the outer end to a hoist rope and passing under a pulley or guide near the front of the bucket so that when the hoist rope is taut and tension is applied to the drag-line cable there is a component of force on the pulley or guide acting to raise the front of the bucket. In one form, as illustrated in Fig. 2, the tipping is controlled by one or more cables 27. One end of each cable 27 is fixed to the hoist line 15 and passes under a pulley 26, journalled near the mouth of the bucket 17, to be secured at the other end to the bucket in close proximity to the bottom of the pulley. A stop 30 on the cable 2 7, co-operates with an abutment 31 on the bucket to control the angular position of the bucket when the hoist and drag-line cables are taut. In a modification, as shown in Fig. 5, the dragline cable is provided with two chains 40 that pass through fairleads 41 and are secured to the hoist cable, the angular position of the bucket when both the hoist and drag-line cables are taut again being controlled by a stop 42 co-operating with the fairleads. The fairleads may be formed in the upper outer edges of a somewhat rectangular U-shaped mouth of the bucket, whilst the back may be higher than the front of the bucket and be formed in a cylindrical arc merging with the bottom of the bucket.