Hydraulic door snubber
First Claim
1. A dipper assembly for a mining shovel, the dipper assembly comprising:
- a dipper having a dipper back and an open dipper bottom;
a dipper door pivotally mounted to the dipper, configured to pivot between an open position and a closed position with a swing speed, and to cover the open dipper bottom; and
a hydraulic snubber, comprising;
a base having one or more connecting plates;
one or more mounting plates coupled to the base and configured to receive a link extending from the dipper door;
one or more friction plates positioned parallel to the mounting plates and the link; and
a hydraulic cylinder positioned through the mounting plates, the connecting plates, the friction plates, and the link to pivotally couple the link to the base, wherein the hydraulic cylinder includes a head portion protruding from a first end of the hydraulic snubber, a tail portion protruding from a second end of the hydraulic snubber opposite the first end, and a piston positioned through the plates and the link and extending out from the tail portion, wherein the hydraulic cylinder is configured to clamp the mounting plates, the connecting plates, the friction plates and the link together and reduce the swing speed of the dipper door by the piston pulling inward against the tail portion and toward the head portion, causing the tail portion and the head portion to apply a substantially constant compressive force to the plates and the link regardless of wear on the plates and the link.
1 Assignment
0 Petitions
Accused Products
Abstract
A dipper assembly for a mining shovel, includes a dipper having a dipper back and an open dipper bottom, and a dipper door pivotally mounted to the dipper, configured to pivot between an open position and a closed position with a swing speed, and to cover the open dipper bottom. The dipper assembly also includes one or more hydraulic door snubbers. The hydraulic door snubbers include a base having one or more connecting plates, one or more mounting plates coupled to the base and configured to receive a link extending from the dipper door, one or more friction plates, and a hydraulic cylinder configured to clamp the mounting plates, the connecting plates, the friction plates and the link together.
16 Citations
20 Claims
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1. A dipper assembly for a mining shovel, the dipper assembly comprising:
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a dipper having a dipper back and an open dipper bottom; a dipper door pivotally mounted to the dipper, configured to pivot between an open position and a closed position with a swing speed, and to cover the open dipper bottom; and a hydraulic snubber, comprising; a base having one or more connecting plates; one or more mounting plates coupled to the base and configured to receive a link extending from the dipper door; one or more friction plates positioned parallel to the mounting plates and the link; and a hydraulic cylinder positioned through the mounting plates, the connecting plates, the friction plates, and the link to pivotally couple the link to the base, wherein the hydraulic cylinder includes a head portion protruding from a first end of the hydraulic snubber, a tail portion protruding from a second end of the hydraulic snubber opposite the first end, and a piston positioned through the plates and the link and extending out from the tail portion, wherein the hydraulic cylinder is configured to clamp the mounting plates, the connecting plates, the friction plates and the link together and reduce the swing speed of the dipper door by the piston pulling inward against the tail portion and toward the head portion, causing the tail portion and the head portion to apply a substantially constant compressive force to the plates and the link regardless of wear on the plates and the link. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hydraulic snubber for a door, comprising:
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a base having one or more connecting plates configured to mate with one or more mating plates of a pivotally mounted link extending from the door; one or more mounting plates coupled to the base and configured to receive the one or more mating plates of the link extending from the door; one or more friction plates positioned adjacent to and parallel with the one or more mounting plates and configured to be adjacent to and parallel with the one or more mating plates of the link; and a hydraulic cylinder configured to be positioned through the connecting plates, the mounting plates, the friction plates, and the mating plates to pivotally couple the link to the base, wherein the hydraulic cylinder includes a head portion protruding from a first end of the hydraulic snubber, a tail portion protruding from a second end of the hydraulic snubber opposite the first end, and a piston positioned through each of the plates and extending out from the tail portion, wherein the hydraulic cylinder is configured to clamp the connecting plates, the mounting plates, the friction plates and the mating plates of the link together and restrict pivotal movement of the link by pulling the piston inward against the tail portion and toward the head portion, causing the tail portion and the head portion to apply a compressive force to the plates of the hydraulic snubber and the link. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for installing a hydraulic snubber for a dipper door, the method comprising:
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providing a base having one or more connecting plates configured to receive a hydraulic cylinder; providing one or more mounting plates configured to receive the hydraulic cylinder; providing one or more friction plates configured to receive the hydraulic cylinder; providing a link configured to pivot about the base, the link having one or more mating plates configured to receive the hydraulic cylinder; positioning the mounting plates, friction plates, connecting plates, and mating plates adjacent to and parallel to each other; inserting a hydraulic cylinder through the connecting plates of the base and through each of the mounting plates, friction plates, and mating plates to pivotally couple the link to the base, wherein the hydraulic cylinder includes a head portion protruding from a first end of the plates, a tail portion protruding from a second end of the plates opposite the first end, and a piston positioned through each of the plates and extending out from the tail portion; retaining the hydraulic cylinder substantially within the base; and applying a compressive force to the connecting plates, the mounting plates, the friction plates, and the mating plates by pumping pressurized hydraulic fluid into the hydraulic cylinder, wherein the pressurized hydraulic fluid pulls the piston inward against the tail portion and toward the head portion, causing the tail portion and the head portion to apply the compressive force to the plates, clamping the plates to reduce the pivotal motion of the link about the base, and wherein the compressive force applied to the plates is substantially constant regardless of wear on the plates. - View Dependent Claims (20)
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Specification