초록 ▼

A dipper including a dipper door and an impact actuated jaw having a “C” shape defining a lip and a chin. The jaw is rotatably mounted on the dipper door for rotation between a door-opened position and a door-closed position and positioned so that when the jaw is in the door-opened position, the jaw

A dipper including a dipper door and an impact actuated jaw having a “C” shape defining a lip and a chin. The jaw is rotatably mounted on the dipper door for rotation between a door-opened position and a door-closed position and positioned so that when the jaw is in the door-opened position, the jaw chin can be impacted by the dipper body when the door pivots to the door-closed position. The dipper also includes a hold open mechanism for releasably holding the door latch in the latch open position when the latch is in the open position, and a locking mechanism for releasably locking the latch when the latch is in the door-closed position. The locking mechanism includes one bar pivotally attached to the door, and another bar pivotally connected to and extending between each of the one bar and the latch.

대표청구항 ▼

1. A dipper adapted to be connected to a power shovel handle for movement therewith, said dipper having a dipper body defining a material receiving opening and a material discharging opening, said dipper body having a latch receiving opening adjacent one end of said discharging opening, said dipper

1. A dipper adapted to be connected to a power shovel handle for movement therewith, said dipper having a dipper body defining a material receiving opening and a material discharging opening, said dipper body having a latch receiving opening adjacent one end of said discharging opening, said dipper further including a dipper door mounted on said dipper body adjacent an opposite end of said discharging opening for pivotal movement relative to said dipper body between a closed position and an opened position, and an impact actuated jaw having a “C” shape defining a lip and a chin, said jaw being rotatably mounted on said dipper door for rotation between a door-opened position and a door-closed position and positioned so that, when said jaw is in the door-opened position, said jaw chin can be impacted by the dipper body when the door pivots to the door-closed position, and so that impact by the dipper body on the chin rotates said jaw into the door-closed position where said jaw lip is in said latch opening and prevents door opening. 2. A dipper in accordance with claim 1 wherein said dipper body has a cutout adjacent said one end of said discharging opening, and a striker bar attached to said dipper body and extending across said cutout parallel to the plane of said dipper discharging opening, said latch receiving opening being defined by said striker bar and said cutout, and wherein said jaw chin impacts said striker bar. 3. A dipper in accordance with claim 1 wherein said striker bar is rotatable relative to said dipper body. 4. A dipper in accordance with claim 1 wherein said dipper further includes a hold open mechanism for releasably holding said jaw in said door-opened position when said jaw is in said open position, and a locking mechanism for releasably locking said jaw when said jaw is in said door-closed position. 5. A dipper in accordance with claim 4 wherein when the locking mechanism is released said latch rotates open as a result of the weight of the door and the material pushing against the dipper door. 6. A dipper in accordance with claim 4 wherein said locking mechanism is a hydraulic cylinder assembly pivotally attached to and extended between said dipper door and said latch. 7. A dipper in accordance with claim 6 wherein said dipper door includes spaced apart structural support ribs. 8. A dipper in accordance with claim 7 wherein said jaw is rotatably mounted between two of said support ribs. 9. A dipper in accordance with claim 8 wherein said cylinder assembly is pivotally attached at one end between two of said support ribs. 10. A dipper in accordance with claim 6 wherein said locking mechanism includes a closed loop hydraulic circuit in communication with said hydraulic cylinder assembly. 11. A dipper in accordance with claim 10 wherein said closed loop hydraulic circuit includes at least one check valve, a locking valve and at least one accumulator. 12. A dipper in accordance with claim 11 wherein said locking valve can be closed to prevent fluid flow through the hydraulic circuit, thus locking the locking mechanism. 13. A dipper in accordance with claim 11 wherein said locking mechanism is unlocked by opening said locking valve. 14. A dipper in accordance with claim 11 wherein said bypass circuit further includes a heat sink. 15. A dipper in accordance with claim 6 wherein when the dipper door is latched the jaw is biased to rotate to release from the latch opening but is held in place by the hydraulically locked cylinder assembly. 16. A dipper in accordance with claim 6 wherein said hold open mechanism comprises said at least one accumulator that provides residual pressure that extends the cylinder assembly to its maximum extension. 17. A dipper in accordance with claim 6 wherein the cylinder assembly is fully retracted when the jaw is in its door-closed position. 18. A dipper in accordance with claim 6 wherein said cylinder assembly includes a cylinder and a piston rod received in the cylinder, and wherein said piston includes an internal check valve. 19. A dipper adapted to be connected to a power shovel handle for movement therewith, said dipper having a dipper body defining a material receiving opening and a material discharging opening, said dipper body having a latch receiving opening adjacent one end of said discharging opening, said dipper further including a dipper door mounted on said dipper body adjacent an opposite end of said discharging opening for pivotal movement relative to said dipper body between a closed position and an opened position; a latch pivotally mounted on said dipper door for pivotal movement between a door-opened position and a door-closed position, and positioned so that when said latch is in the door-opened position, said latch is not in said latch opening, and when in said door-closed position, said latch is in said latch opening and prevents door-opening,a hold open mechanism for releasably holding said door latch in said latch open position when said latch is in said open position, anda locking mechanism for releasably locking said latch when said latch is in said door-closed position, said locking mechanism includingone bar pivotally attached to the door, andanother bar pivotally connected to and extending between each of the one bar and the latch. 20. A dipper in accordance with claim 19 wherein said latch is a “C” shaped jaw. 21. A dipper in accordance with claim 19 wherein said hold open mechanism is means biasing the latch into the open position. 22. A dipper in accordance with claim 21 wherein said means biasing the latch into its open position is a spring. 23. A dipper in accordance with claim 22 wherein said spring is attached between the one bar and the connecting bar. 24. A dipper in accordance with claim 23 wherein said pivot connection between the one bar and the connecting bar travels over the spring. 25. A dipper in accordance with claim 21 wherein said means biasing the latch into its open position also holds the latch in the locked position. 26. A dipper in accordance with claim 19 wherein said locking mechanism is locked by impact of one bar end into a secondary latch. 27. A dipper in accordance with claim 26 wherein said secondary latch comprises a bar holder pivotally mounted on said dipper door, said bar holder having a bar holding indentation, said indentation receiving said one bar end and preventing movement of said one bar end when in a bar holding position and permitting movement of said one bar end when in a bar releasing position. 28. A dipper in accordance with claim 27 and further including means biasing said bar holder toward an unlocked position but is held in locked position by a plunger. 29. A dipper in accordance with claim 28 wherein said means biasing said bar holder also aids holding the latch in the bar holding position. 30. A dipper in accordance with claim 27 wherein the secondary latch is biased toward the bar releasing position but is held in its bar holding position by a plunger. 31. A dipper in accordance with claim 30 wherein said plunger presses against said secondary latch and then slips into position when the secondary latch rotates out of the plunger's way. 32. A dipper in accordance with claim 31 wherein said plunger is biased toward secondary latch by a compression spring. 33. A dipper in accordance with claim 19 wherein, when the locking mechanism is released, said latch rotates open as a result of the weight of the door and the material pushing against the dipper door. 34. A dipper in accordance with claim 19 wherein said dipper body has a cutout adjacent said one end of said discharging opening, and a striker bar attached to said dipper body and extending across said cutout parallel to the plane of said dipper discharging opening, said latch receiving opening being defined by said striker bar and said cutout, and wherein said jaw chin impacts said striker bar. 35. A dipper in accordance with claim 34 wherein said striker bar is rotatable relative to said dipper body. 36. A dipper in accordance with claim 19 wherein said dipper door includes spaced apart structural support ribs. 37. A dipper in accordance with claim 36 wherein said jaw is rotatably mounted between two of said support ribs. 38. A dipper in accordance with claim 37 wherein said latch, hold open mechanism and locking mechanism is located between two of said support ribs. 39. A dipper in accordance with claim 19 wherein said Said latch further includes a first bumper stop adjacent one side of the pivotal connection of the one bar to the other bar, and a second bumper stop adjacent to the other side of the pivotal connection of the one bar to the other bar. 40. A dipper in accordance with claim 19 wherein said latch includes a “C” shaped jaw having a lip and a chin, and wherein said jaw has a mouth having a width, and wherein said mouth has a central dipper body engaging surface narrower then said mouth width, and outer surfaces that angle away from said dipper door latch receiving opening. 41. A dipper in accordance with claim 19 wherein said jaw is mounted within a housing, and wherein said jaw includes radially outward wipers on said jaw outer surface, said wipers extending between said jaw outer surface and said housing. 42. A dipper adapted to be connected to a power shovel handle for movement therewith, said dipper having a dipper body defining a material receiving opening and a material discharging opening, said dipper body having a latch receiving opening adjacent one end of said discharging opening, said dipper further including a dipper door mounted on said dipper body adjacent an opposite end of said discharging opening for pivotal movement relative to said dipper body between a closed position and an opened position; a latch pivotally mounted on said dipper door for pivotal movement between a door-opened position and a door-closed position, and positioned so that when said latch is in the door-opened position, said latch is not in said latch opening, and when in said door-closed position, said latch is in said latch opening and prevents door-opening,a hold open mechanism for releasably holding said door latch in said latch open position when said latch is in said open position, anda locking mechanism for releasably locking said latch when said latch is in said door-closed position, said locking mechanism includinga secondary latch comprising a bar holder pivotally mounted on said dipper door,one bar pivotally attached to the door,another bar pivotally connected to and extending between each of the one bar and the latch, said locking mechanism being locked by impact of one bar end into a secondary latch, said secondary latch, said bar holder having a bar holding indentation, said indentation receiving said one bar end and preventing movement of said one bar end when in a bar holding position and permitting movement of said one bar end when in a bar releasing position, anda false latching preventing mechanism mounted on said dipper door and extending between said dipper body and said dipper door, said false latching preventing mechanism preventing movement of said bar holder from a bar releasing position to a bar holding position when the dipper door is pivoted open, and permitting movement of said bar holder to a bar holding position when said dipper door is near a dipper door closed position. 43. A dipper in accordance with claim 42 wherein said false latching preventing mechanism comprises a plunger mounted in a housing on said dipper door, adjacent said bar holder, a notch on said bar holder that receives said plunger, and a link mechanism between said plunger and said dipper body that retracts said plunger away from said bar holder when said dipper door is near a dipper door closed position, and biasing means between said plunger housing and said plunger that extends said plunger into said bar holder notch when said dipper door is pivoted open.