Patents Assigned to Esco Corporation
  • Patent number: 5269382
    Abstract: An impact device for breaking up and separating hard material comprises an actuating system for providing a faster cycle rate as well as an increased impact force. More specifically, the device includes a pair of pistons movably arranged in a cylinder to cooperate in compressing the gaseous component prior to initiating the blow. A closed tube is provided to fluidly interconnect opposite chambers adjacent the two pistons to coordinate the different movements of the pistons to effect the desired compression. The impact device is particularly well suited for use in an impact bucket.
    Type: Grant
    Filed: May 8, 1992
    Date of Patent: December 14, 1993
    Assignee: ESCO Corporation
    Inventor: Jack B. Ottestad
  • Patent number: 5241765
    Abstract: A lock assembly for a surface subject to abrasive wear including a base element and a wear element coupled either by conforming T-shaped elements or dovetails and which includes a lock resiliently urged against an integral keeper in the base or wear element.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: September 7, 1993
    Assignee: ESCO Corporation
    Inventors: Larren F. Jones, Emory D. Hungerford, Frederick C. Goeth
  • Patent number: 5188680
    Abstract: A method of making a tooth point and product wherein a tubular blank of alloy steel is heated, shaped at one end to provide a box section and shaped at the other end to provide a blade made up of two layers of steel forged together.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: February 23, 1993
    Assignee: ESCO Corporation
    Inventors: Frederick C. Hahn, Andrew H. Ulven, James W. Huiras
  • Patent number: 5183316
    Abstract: A mounting bracket for mounting a working device to a boom of a carrier includes a base, flanges for attaching the bracket to the boom, and ears for attaching the working device to the bracket. The ears each define a hole for pivotally coupling the working device thereto for free pivotal movement about a single axis to alleviate the generation of excessive side forces. The bracket further includes stops to limit the free angular movement so that the working device can be oriented at an inclination and so that it may be used to pry pieces of the worked material.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: February 2, 1993
    Assignee: ESCO Corporation
    Inventor: Jack B. Ottestad
  • Patent number: 5152088
    Abstract: A novel tooth point, locking pin and method of replacing a worn point wherein the point is held in place by a pin having a resilient laterally outwardly extending projection received in a recess provided in the inner surface of an L-shaped rearwardly extending tongue on the point, the pin having an elastomeric core within a steel jacket.
    Type: Grant
    Filed: May 13, 1991
    Date of Patent: October 6, 1992
    Assignee: ESCO Corporation
    Inventor: Frederick C. Hahn
  • Patent number: 5096247
    Abstract: A hydraulic supply system for a snubber including spaced check valves in the snubber housing supply passage and a relief passage connected to the supply passage between the check valves.
    Type: Grant
    Filed: January 16, 1991
    Date of Patent: March 17, 1992
    Assignee: ESCO Corporation
    Inventor: John R. Killen
  • Patent number: 5088214
    Abstract: A replaceable wear edge for the forward edge of an excavator such as the lip or wing and which includes a generally U-shaped wear member equipped with a generally T-shaped slot engageable with a conforming T-shaped boss on a confronting surface on the excavator, the wear member upper surface being equipped with a keeper-equipped opening for receiving a lock between the boss and wear member.
    Type: Grant
    Filed: January 17, 1991
    Date of Patent: February 18, 1992
    Assignee: ESCO Corporation
    Inventor: Larren F. Jones
  • Patent number: 5084990
    Abstract: A dragline bucket and method of operating a dragline bucket wherein a reverse V configuration of teeth is employed to eliminate slewing, i.e., sideways movement when encountering an off-center obstacle.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: February 4, 1992
    Assignee: ESCO Corporation
    Inventor: Terry L. Briscoe
  • Patent number: 5074062
    Abstract: A method of replacing a worn point of an excavating tooth wherein the point is held in place by a pin lock including a shearable top flange and torque-resisting, forwardly extending rib, the method including exerting a downward force on the pin lock to shear the top flange while the forwardly extending rib guides the pin lock downwardly and out of locking engagement with aligned slots in the tooth adapter nose and point rearwardly extending ear, removing the worn point and installing a new point along with a new pin lock including a top flange and forwardly extending rib.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: December 24, 1991
    Assignee: Esco Corporation
    Inventors: Frederick C. Hahn, Kirk E. Yoresen, William A. Fewless, Robert K. Emrich, Michael J. Secrist
  • Patent number: 5068986
    Abstract: An excavating tooth point having a pin receiving opening, a cavity in the point in communication with the opening and a resilient lock for the pin in the cavity.
    Type: Grant
    Filed: August 30, 1990
    Date of Patent: December 3, 1991
    Assignee: Esco Corporation
    Inventor: Larren F. Jones
  • Patent number: 5069871
    Abstract: A method of producing a crusher wear part and the like subject to gouging abrasion type metal loss wherein the part is made of a modified austenitic (Hadfields) manganese steel having an Aluminum/Carbon ratio of 1.0 to 1.7, the casting being heat treated by heating to 2000.degree.-2050.degree. F. followed by a water quench to provide gouging abrasion resistance at least about 10% higher than that of Hadfields.
    Type: Grant
    Filed: May 2, 1990
    Date of Patent: December 3, 1991
    Assignee: ESCO Corporation
    Inventor: William E. Fuller
  • Patent number: 5065824
    Abstract: An impact hammer according to this invention has a frame to house its actuating mechanism and to support a working impact tool which is to receive a sharp impact blow from the impact hammer and deliver it to a structure or formation that is to be pierced or fragmented. The impact tool projects from the frame and is axially reciprocable in the frame. A hammer head is reciprocably mounted in the frame with a close sliding fit. It has an impact face that faces toward the impact tool to strike the tool when the impact is intended to occur. At positions beyond this intended range, the hammer head is braked so it does not impact the frame. The blow to the tool is a high-energy, sharp blow, and is not intended to contribute a follow-on application of force after the initial impact. The hammer head has a shank, a loading shoulder and a poppet port.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: November 19, 1991
    Assignee: Esco Corporation
    Inventor: Jack B. Ottestad
  • Patent number: 5063695
    Abstract: An assembly of wear element for installation on the wearable part of a structure engageable with abrasive material including a relatively elongated base element adapted to be secured to the wearable part and a relatively elongated wear element releasably, reversibly mounted on the base element, each of the elements having longitudinally spaced apart dovetail surfaces in one outstanding wall portion and at least one surface in a second opposed outstanding wall portion positioned between the spaced art dovetail surfaces. A method of designing the dovetail connection through a repeating pattern is also disclosed.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: November 12, 1991
    Assignee: ESCO Corporation
    Inventors: Terry L. Briscoe, Paul C. Sprunger
  • Patent number: 5056243
    Abstract: A locked connection for structures engageable with abrasive material and the like including a pair of relatively elongated elements at least one of which is subject to abrasive wear, the elements having parallel longitudinally extending centerlines and spaced apart generally planar surfaces arranged at an angle to the centerlines and between which a bi-stress lock is positioned.
    Type: Grant
    Filed: May 11, 1990
    Date of Patent: October 15, 1991
    Assignee: ESCO Corporation
    Inventors: Paul C. Sprunger, Terry L. Briscoe
  • Patent number: 5005304
    Abstract: An assembly of wear elements for installation on the wearable part of a structure engageable with abrasive material including a relatively elongated base element adapted to be secured to the wearable part and a relatively elongated wear element releasably, reversibly mounted on the base element, each of the elements having first and second pair of longitudinally spaced apart dovetail surfaces with one of the elements having third and fourth pairs of longitudinally spaced apart dovetail surfaces.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: April 9, 1991
    Assignee: ESCO Corporation
    Inventors: Terry L. Briscoe, Paul C. Sprunger
  • Patent number: 4995176
    Abstract: An assembly of wear element for installation on the wearable part of a structure engageable with abrasive material including a relatively elongated base element adpated to be secured to the wearable part and a relatively elongated wear element releasably, reversibly mounted on the base element, each of the elements having longitudinally spaced apart dovetail surfaces in one outstanding wall portion and a single surface in an opposed outstanding wall portion.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: February 26, 1991
    Assignee: Esco Corporation
    Inventors: Terry L. Briscoe, Paul C. Sprunger
  • Patent number: 4987935
    Abstract: A tree saw includes a frame adapted to be attached to the boom of a prime mover, a tree clamping mechanism on the frame, and a carriage assembly on the frame below the clamping mechanism. The carriage assembly includes a generally plate-like chassis, a generally U-shaped bulkhead upstanding from the chassis and providing a recessed base portion and forwardly-extending arm portions, and a slide mechanism on the arm portions. A rail mechanism on the frame receives the slide mechanism for reciprocating movement of the carriage assembly. A hydraulic cylinder assembly interconnects the bulkhead and frame for reciprocating the carriage assembly. An annular rim member rotatably mounted on the chassis has a geared inner circumference and a toothed outer circumference projecting forwardly of the base portion. A motor-driven pinion mechanism on the chassis engages the rim member inner circumference to rotate the rim member.
    Type: Grant
    Filed: January 5, 1990
    Date of Patent: January 29, 1991
    Assignee: Esco Corporation
    Inventors: Sean P. Corcoran, Thomas E. Dixon, Stanley Farmer, Emory D. Hungerford, Mark Mallory
  • Patent number: 4965945
    Abstract: An excavating tooth having a socket-equipped point mounted on an adapter nose and secured with a vertical pin on one side of the nose, the nose being grooved for receipt of the pin and equipped with a resilient keeper extending transversely of the point length, the point having a least one side wall extending rearwardly beyond the socket, the side wall having integral, vertically spaced apart lug portions having forwardly facing surfaces bearing against the pin, the nose groove providing a rearwardly facing surface bearing against the pin intermediate the lug bearing surfaces.
    Type: Grant
    Filed: February 10, 1989
    Date of Patent: October 30, 1990
    Assignee: ESCO Corporation
    Inventor: Robert K. Emrich
  • Patent number: 4960162
    Abstract: Foundry sand lumps containing a water soluble binder are broken down to grain size, mechanically scrubbed to remove slime-forming impurities, dust and some of the binder, washed to remove substantially all the remaining binder and provide a sand/water slurry, pressure filtered and dried.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: October 2, 1990
    Assignee: Esco Corporation
    Inventor: Richard J. Millager
  • Patent number: RE33454
    Abstract: A wear runner for an excavating bucket which includes a plurality of base elements secured to the bucket in end-to-end relation, a runner element for each base element removably mounted thereunder by means of a rearwardly divergent dovetail.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: November 27, 1990
    Assignee: ESCO Corporation
    Inventor: James T. Potter