Trunnion for a rear taper dragline bucket

Abstract

Described are a rear taper dragline bucket having a trunnion, a trunnion system, and a trunnion that permit a rear taper dragline bucket to be operated without a spreader bar while providing reduced wear on the trunnion, trunnion link, and trunnion pin.

What is claimed is: 
     
         1 . A dragline bucket comprising:
 a basket having a first sidewall and a second sidewall;   a first trunnion disposed on the first sidewall, the first trunnion having a female clevis and a trunnion pin hole;   a first trunnion link having a male clevis constructed to engage the female clevis of the first trunnion and a trunnion link hole, wherein the female clevis of the first trunnion is configured to align the first trunnion link along a first plane defined a hoist chain as the hoist chain rotates about the first trunnion from a first position to a second position during a dump phase of the dragline bucket;   a first trunnion pin constructed to be inserted into the trunnion pin hole and the trunnion link hole, wherein the trunnion pin hole and the trunnion link hole are configured to receive the first trunnion pin and to align the first trunnion pin at a first angle, wherein the first angle is perpendicular to the first plane;   a second trunnion disposed on the second sidewall, the second trunnion having a female clevis and a trunnion pin hole;   a second trunnion link having a male clevis constructed to engage the female clevis of the second trunnion and a trunnion link hole, wherein the female clevis of the second trunnion is configured to align the second trunnion link along a second plane defined a hoist chain as the hoist chain rotates about the second trunnion from a first position to a second position during a dump phase of the dragline bucket; and   a second trunnion pin constructed to be inserted into the trunnion pin hole of the second trunnion and the trunnion link hole of the second trunnion link, wherein the trunnion pin hole and the trunnion link hole are configured to receive the second trunnion pin and to align the second trunnion pin at a second angle, wherein the second angle is perpendicular to the first plane.   
     
     
         2 . The dragline bucket of  claim 1 , wherein the dragline bucket is a rear taper dragline bucket. 
     
     
         3 . The dragline bucket of  claim 2 , wherein the first trunnion and the second trunnion are disposed forward of a taper line of the rear taper dragline bucket. 
     
     
         4 . The dragline bucket of  claim 2 , wherein the first trunnion and the second trunnion are disposed at a taper line of the rear taper dragline bucket. 
     
     
         5 . The dragline bucket of  claim 2 , wherein the first trunnion and the second trunnion are disposed rear of a taper line of the rear taper dragline bucket. 
     
     
         6 . A trunnion system comprising:
 a first trunnion configured to attach to a first sidewall of a dragline bucket, the first trunnion having a female clevis and a trunnion pin hole;   a first trunnion link having a male clevis constructed to engage the female clevis of the first trunnion and a trunnion link hole, wherein the female clevis of the first trunnion is configured to align the first trunnion link along a first plane defined a hoist chain as the hoist chain rotates about the first trunnion from a first position to a second position during a dump phase of the dragline bucket;   a first trunnion pin constructed to be inserted into the trunnion pin hole and the trunnion link hole, wherein the trunnion pin hole and the trunnion link hole are configured to receive the first trunnion pin and to align the first trunnion pin at a first angle, wherein the first angle is perpendicular to the first plane;   a second trunnion configured to attach to a second sidewall of the dragline bucket, the second trunnion having a female clevis and a trunnion pin hole;   a second trunnion link having a male clevis constructed to engage the female clevis of the second trunnion and a trunnion link hole, wherein the female clevis of the second trunnion is configured to align the second trunnion link along a second plane defined a hoist chain as the hoist chain rotates about the second trunnion from a first position to a second position during a dump phase of the dragline bucket; and   a second trunnion pin constructed to be inserted into the trunnion pin hole of the second trunnion and the trunnion link hole of the second trunnion link, wherein the trunnion pin hole and the trunnion link hole are configured to receive the second trunnion pin and to align the second trunnion pin at a second angle, wherein the second angle is perpendicular to the first plane.   
     
     
         7 . The trunnion system of  claim 6 , wherein the dragline bucket is a rear taper dragline bucket. 
     
     
         8 . The trunnion system of  claim 7 , wherein the first trunnion and the second trunnion are disposed forward of a taper line of the rear taper dragline bucket. 
     
     
         9 . The trunnion system of  claim 7 , wherein the first trunnion and the second trunnion are disposed at a taper line of the rear taper dragline bucket. 
     
     
         10 . The trunnion system of  claim 7 , wherein the first trunnion and the second trunnion are disposed rear of a taper line of the rear taper dragline bucket. 
     
     
         11 . A trunnion configured to attach to a sidewall of a dragline bucket, the trunnion having a female clevis and a trunnion pin hole, wherein the female clevis is configured to engage a male clevis of a trunnion link, wherein the female clevis of the trunnion is configured to align the trunnion link along a plane defined by a hoist chain as the hoist chain rotates about the trunnion from a first position to a second position during a dump phase of the dragline bucket. 
     
     
         12 . The trunnion of  claim 11 , further comprising a trunnion link having a trunnion link hole. 
     
     
         13 . The trunnion of  claim 12 , further comprising a trunnion pin constructed to be inserted into the trunnion pin hole and the trunnion link hole, wherein the trunnion pin hole and the trunnion link hole are configured to receive the trunnion pin and to align the trunnion pin at an angle, wherein the angle is perpendicular to the plane. 
     
     
         14 . The trunnion of  claim 13 , wherein the dragline bucket is a rear taper dragline bucket. 
     
     
         15 . The trunnion of  claim 14 , wherein the trunnion is disposed forward of a taper line of the rear taper dragline bucket. 
     
     
         16 . The trunnion of  claim 14 , wherein the trunnion is disposed at a taper line of the rear taper dragline bucket. 
     
     
         17 . The trunnion of  claim 14 , wherein the trunnion is disposed rear of a taper line of the rear taper dragline bucket.