Andrew P Dretzka

US Patent:

55909680, Jan 7, 1997

Filed:

Sep 18, 1995

Appl. No.:

8/529320

Inventors:

Andrew P. Dretzka - Cudahy WI

Assignee:

Harnischfeger Corporation - Brookfield WI

International Classification:

F16C 1936

US Classification:

384563

Abstract:

Apparatus comprising an inner member having an axis and an axially extending outer surface, an outer member having an axially extending inner surface, the inner and outer members being rotatable relative to each other about the axis, a bearing between the inner and outer surfaces, the bearing having a radially extending bearing surface, and a bearing retainer assembly including a first retainer which engages the bearing surface and which has a first tapered surface, a second retainer having a second tapered surface engaging the first tapered surface, an axially extending retainer surface engaging one of the inner and outer members, and a radially extending retainer surface, each of the first and second tapered surfaces tapering radially away from the one of the inner and outer members and axially away from the bearing, a spring engaging the retainer surface, and a cap which is fixed to the one of the inner and outer members and which engages the spring so that the spring is compressed between the cap and the retainer surface and exerts a force on the retainer surface whereby the second retainer is wedged between the first retainer and the one of the inner and outer members.

US Patent:

56364601, Jun 10, 1997

Filed:

Sep 18, 1995

Appl. No.:

8/529868

Inventors:

Andrew P. Dretzka - Cudahy WI

Assignee:

Harnischfeger Corporation - Brookfield WI

International Classification:

B66D 304

US Classification:

37397

Abstract:

A dragline comprising a main housing, a bucket hoist mechanism mounted on the housing, a bucket drag mechanism mounted on the main housing, a moving mechanism for moving the main housing over the ground, a boom which is supported on the main housing and which has an upper end, a bucket, a hoist rope having one end connected to the bucket hoist mechanism, extending over the sheave, and having an opposite end, a drag rope extending between the bucket and the bucket drag mechanism, a dump block including a frame having a main portion connected to the opposite end of the hoist rope, and a cantilevered spindle extending from the main portion, and a dump block sheave mounted on the spindle for rotation about a sheave axis, and a dump rope extending over the dump block sheave and having one end connected to the drag rope and an opposite end connected to the bucket, such that the dump rope can be removed from the sheave in the direction away from the frame main portion.

US Patent:

54108268, May 2, 1995

Filed:

Mar 1, 1993

Appl. No.:

8/024393

Inventors:

Darryl R. Immel - Waterford WI
Andrew P. Dretzka - Cudahy WI
Harvey J. Kallenberger - Wind Lake WI

Assignee:

Harnischfeger Corporation - Milwaukee WI

International Classification:

E02F 0928

US Classification:

37457

Abstract:

A digging tooth assembly has first and second wedged members retaining a digging tooth tip on a tooth base. The improvement comprises a tension member, e. g. , a bolt, coupled to the first member and engaging the second member. The bolt has an adjustable effective length so that the first member can be drawn into wedged engagement with the second member. Other aspects of the invention involve a method for assembling a digging tooth assembly having an apertured tooth tip on an apertured, supporting tooth base. The method includes the steps of inserting a first wedge-like member into the aperture, inserting a second wedge-like member into the aperture and drawing the first member upward into wedged engagement with the second member.

US Patent:

53984331, Mar 21, 1995

Filed:

Feb 8, 1993

Appl. No.:

8/014502

Inventors:

Andrew P. Dretzka - Cudahy WI

Assignee:

Harnischfeger Corporation - Brookfield WI

International Classification:

E02F 358

US Classification:

37399

Abstract:

A bucket dump block, used on dragline buckets, has side frames and a rotatable rope-guiding sheave. In the improvement, each side frame has a separate ring-like support section extending toward the other side frame and abutting the support section of such other side frame. The sheave is supported by and rotates about such support sections. The sheave rides on an annular anti-friction member retained on a sleeve into which the support sections are press-fitted. The dump block (which is devoid of provisions for lubrication) has a minimum number of parts and is easy to manufacture and repair.

US Patent:

20200040545, Feb 6, 2020

Filed:

Oct 8, 2019

Appl. No.:

16/596392

Inventors:

- Milwaukee WI, US
Ethan Pedretti - Holmen WI, US
Anab Akanda - Ann Arbor MI, US
Jason Gaska - Columbus WI, US
Christopher Jones - Milwaukee WI, US
Matthew Loew - Oconomowoc WI, US
Andrew P. Dretzka - New Berlin WI, US
Jason Knuth - Brookfield WI, US

International Classification:

E02F 3/30
E21C 47/00
E21C 27/30
E02F 3/46
E02F 9/22
F16L 3/015
E02F 9/14

Abstract:

An industrial machine includes a frame having a base and a boom, an arm movably coupled to the boom, an attachment, a conduit, a first member, and a second member. The boom has a first end coupled to the base and a second end opposite the first end. The arm includes a first end and a second end. The attachment is coupled to the first end of the arm. The conduit extends from the frame to the arm. The first member is pivotably coupled to the frame and supports a first portion of the conduit as the arm moves relative to the boom. The second member is pivotably coupled between the first member and the arm, and supports a second portion of the conduit as the arm moves relative to the boom.

US Patent:

20160281317, Sep 29, 2016

Filed:

Jun 6, 2016

Appl. No.:

15/174577

Inventors:

- Wilmington DE, US
Ethan Pedretti - Holmen WI, US
Anab Akanda - Ann Arbor MI, US
Jason Gaska - Columbus WI, US
Christopher Jones - Milwaukee WI, US
Matthew Loew - Oconomowoc WI, US
Andrew P. Dretzka - New Berlin WI, US
Jason Knuth - Brookfield WI, US

International Classification:

E02F 3/30
E02F 9/22
E02F 9/14

Abstract:

An industrial machine includes a frame having a base and a boom, an arm movably coupled to the boom, an attachment, a conduit, a first member, and a second member. The boom has a first end coupled to the base and a second end opposite the first end. The arm includes a first end and a second end. The attachment is coupled to the first end of the arm. The conduit extends from the frame to the arm. The first member is pivotably coupled to the frame and supports a first portion of the conduit as the arm moves relative to the boom. The second member is pivotably coupled between the first member and the arm, and supports a second portion of the conduit as the arm moves relative to the boom.

US Patent:

20150020636, Jan 22, 2015

Filed:

Jul 15, 2014

Appl. No.:

14/331348

Inventors:

- Wilmington DE, US
Andrew P. Dretzka - New Berlin WI, US

International Classification:

E02F 9/14
B25J 18/00

US Classification:

7449001

Abstract:

A rope shovel has a boom and a hoist rope. The boom has a first end and a second end. The hoist rope extends over the second end of the boom. A digging assembly for the rope shovel includes a shaft, an elongated member supported for movement relative to the boom, an attachment, and a drive link. The shaft is positioned between the first end and the second end of the boom and transverse to the boom, and the shaft includes at least one pinion gear. The elongated member includes a first end and a second end. The attachment is coupled to the first end of the elongated member and is configured to be coupled to the hoist rope. The drive link includes a rack engaging the pinion gear of the transverse shaft such that rotation of the pinion gear moves the drive link and actuates the attachment.

US Patent:

20140227071, Aug 14, 2014

Filed:

Feb 11, 2014

Appl. No.:

14/177855

Inventors:

- Wilmington DE, US
Ethan Pedretti - Holmen WI, US
Anab Akanda - Ann Arbor MI, US
Jason Gaska - Columbus WI, US
Christopher Jones - Milwaukee WI, US
Matthew Loew - Oconomowoc WI, US
Andrew P. Dretzka - New Berlin WI, US

International Classification:

E02F 9/08
E02F 3/30
E21C 27/30

US Classification:

414685, 248 49

Abstract:

An industrial machine includes a frame having a base and a boom, an arm movably coupled to the boom, an attachment, a conduit, a first member, and a second member. The boom has a first end coupled to the base and a second end opposite the first end. The arm includes a first end and a second end. The attachment is coupled to the first end of the arm. The conduit extends from the frame to the arm. The first member is pivotably coupled to the frame and supports a first portion of the conduit as the arm moves relative to the boom. The second member is pivotably coupled between the first member and the arm, and supports a second portion of the conduit as the arm moves relative to the boom.