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Eric P Hamkins

from Placerville, CA
Age ~63
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Also known as:
Eric J Hamkins, Ericp Hamkins
Related to:
Gregg John Grandis, 60Kerry A Neusen, 56Francis Thompson, 59Abigail Riemer, 33Kelly Neusen, 41N Krall, 29
Connected to:
Jon J Hamkins, 56Deidre D Hamlar, 65Nichole J Hamlen, 41Christina M Hamler, 71Jamaal M Hamler, 34Larry L Hamler, 76Laura Hamler, 41Lawrence J Hamler, 72Patrick B Hamler, 57Rayshawn D Hamler, 44

Eric Hamkins Phones & Addresses

  • Placerville, CA
  • 816 Bloomfield Village Blvd, Auburn Hills, MI 48326
  • Waukesha, WI
  • West Allis, WI
  • Clarkston, MI
  • Pontiac, MI

Work

Company: Husco international Jul 1990 Address: Waukesha, WI Position: Staff engineer

Education

Degree: MSE School / High School: Milwaukee School of Engineering 1999 to 2004 Specialities: Mechanical Engineering, Hydraulics

Skills

Hydraulics • CAD • Finite Element Analysis • Matlab • Easy5 • Amesim

Industries

Machinery

Resumes

Resumes

Eric Hamkins Photo 1

Staff Engineer At Husco International

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Position:
Staff Engineer at HUSCO International
Location:
Waukesha, Wisconsin
Industry:
Machinery
Work:
HUSCO International - Waukesha, WI since Jul 1990
Staff Engineer
Education:
Milwaukee School of Engineering 1999 - 2004
MSE, Mechanical Engineering, Hydraulics University of Wisconsin-Platteville 1980 - 1984
BSME, Mechanical Engineering
Skills:
Hydraulics
CAD
Finite Element Analysis
Matlab
Easy5
Amesim

Publications

Us Patents

Electrohydraulic Valve For Controlling A Cam Shaft Phasing Mechanism Of An Internal Combustion Engine

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US Patent:
6640834, Nov 4, 2003
Filed:
Aug 6, 2002
Appl. No.:
10/213194
Inventors:
Eric P. Hamkins - Waukesha WI
Edward A. Flynn - Pewaukee WI
Assignee:
Husco International, Inc. - Waukesha WI
International Classification:
A44B 900
US Classification:
13762565, 123 9012, 2511291
Abstract:
A solenoid operated valve has a valve body with a plurality of ports and a spool slidable within the body to interconnect the ports in different combinations. A solenoid, which is coupled to drive the spool, has a coil wound on an annular bobbin with a tube of an electrically conductive, non-magnetic metal within the bobbin. A first pole piece extends into one end of the tube and a second pole piece extends into another end of the tube. A separate bushing is located in an aperture in each pole piece. Each bushing has a tubular body with a first end section that has a larger outer diameter than a second end section and the second end section that has a smaller inner diameter than the first end section. The solenoid further includes an armature that is slidably received in the bushings and engaging the spool.

Hydraulic Vibration Damper Piston With An Integral Electrically Operated Adjustment Valve

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US Patent:
7654369, Feb 2, 2010
Filed:
May 20, 2008
Appl. No.:
12/123917
Inventors:
Todd Michael Murray - New Berlin WI, US
Curtis L. Van Weelden - Waukesha WI, US
Eric Peter Hamkins - Waukesha WI, US
Assignee:
HUSCO International, Inc. - Waukesha WI
International Classification:
F16F 9/35
US Classification:
1882665, 1882826
Abstract:
A vibration damper piston includes a piston body with a bore from which first and second apertures respectively provide paths to first and second chambers of the vibration damper. A valve spool in the bore defines a pilot chamber and controls fluid flow between the first and second apertures. First and second springs bias the valve spool in opposing directions. A control orifice provides a continuous fluid path between the first chamber and the pilot chamber, and a variable orifice provides another fluid path between the second chamber and the pilot chamber. An actuator is operably connected to adjust the variable orifice in response to a control signal.

Energy Recovery And Reuse Methods For A Hydraulic System

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US Patent:
7823379, Nov 2, 2010
Filed:
Nov 14, 2007
Appl. No.:
11/939847
Inventors:
Eric P. Hamkins - Waukesha WI, US
Dwight B. Stephenson - Oconomowoc WI, US
Joseph L. Pfaff - Wauwatosa WI, US
Keith A. Tabor - Richfield WI, US
Assignee:
HUSCO International, Inc. - Waukesha WI
International Classification:
F16D 31/02
US Classification:
60414, 60418
Abstract:
A method provides several modes for recovering hydraulic energy produced by an overrunning load acting on cylinders connected in parallel to a machine component. In one mode, fluid from first chambers in both cylinders is routed into the accumulator, while other fluid is directed into second chambers of those cylinders. In a different mode, fluid is routed from the first chamber of only one cylinder into the accumulator, and fluid from the first chamber of the other cylinder goes into the second chambers of both cylinders. Yet another mode comprises routing fluid from the first chambers of both cylinders into the second chambers of both cylinders. In still another mode, fluid from the first chambers of both cylinders goes into the return conduit while the second chambers of both cylinders receive fluid from a supply conduit. Several modes of reusing the recovered energy are described.

Energy Recovery And Reuse Techniques For A Hydraulic System

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US Patent:
7905088, Mar 15, 2011
Filed:
Nov 14, 2007
Appl. No.:
11/939861
Inventors:
Dwight B. Stephenson - Oconomowoc WI, US
Eric P. Hamkins - Waukesha WI, US
Joseph L. Pfaff - Wauwatosa WI, US
Keith A. Tabor - Richfield WI, US
Assignee:
INCOVA Technologies, Inc. - Waukesha WI
International Classification:
F16D 31/02
US Classification:
60414, 60417, 60418
Abstract:
A hydraulic system has a valve assembly with two workports coupled to chambers of first and second cylinders which are connected mechanically in parallel to a machine component. A separation control valve is connected between first chambers of both cylinders, and a shunt control valve is connected between the workports. A recovery control valve couples an accumulator to the first chamber of the second cylinder. Opening and closing the valves in different combinations routes fluid from one or both cylinders into the accumulator where the fluid is stored under pressure, and thereafter enables stored fluid to be used to power one or both cylinders. The shunt control valve is used to route fluid exhausting from one chamber of each cylinder to the other chambers of those cylinders. Thus the hydraulic system recovers and reuses energy in various manners.

Flow Summation System For Controlling A Variable Displacement Hydraulic Pump

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US Patent:
8215107, Jul 10, 2012
Filed:
Oct 8, 2010
Appl. No.:
12/901058
Inventors:
Joseph L. Pfaff - Wauwatosa WI, US
Eric P. Hamkins - Waukesha WI, US
Assignee:
HUSCO International, Inc. - Waukesha WI
International Classification:
F15B 11/00
F15B 11/16
US Classification:
60424, 60484
Abstract:
A valve assembly couples a plurality of hydraulic actuators to a variable displacement pump and to a tank. A separate valve is associated with each hydraulic actuator and comprises a variable flow source orifice between the supply conduit and a summation node coupled to a pump control port, a variable metering orifice between the summation node and the associated hydraulic actuator, and a variable bypass orifice between the summation node and the tank. As a valve operates to enlarge the metering orifice, the flow source orifice also enlarges, and the bypass orifice shrinks. When the valve operates to shrink the metering orifice, the flow source orifice also shrinks and the bypass orifice enlarges. Those operations vary fluid flow in and out of the summation node, which alters pressure applied to the pump control, thereby causing the pump output to vary as required to drive the associated hydraulic actuator.

Differential Pressure Control

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US Patent:
8453783, Jun 4, 2013
Filed:
Jun 18, 2007
Appl. No.:
12/665391
Inventors:
Eric Hamkins - Waukesha WI, US
Steve Gary Fleischmann - Dubuque IA, US
Mark Schultz - Delafield WI, US
Lynn Russell - Eagle WI, US
Kristen D. Cadman - Dubuque IA, US
Assignee:
Deere & Company - Moline IL
International Classification:
B60K 17/00
US Classification:
180306
Abstract:
A vehicle with a load sensing hydraulic control system is disclosed.

Hydraulic Actuator Control Circuit With Pressure Operated Counterbalancing Valves

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US Patent:
20080034957, Feb 14, 2008
Filed:
Aug 9, 2006
Appl. No.:
11/463486
Inventors:
Dwight B. Stephenson - Oconomowoc WI, US
Joseph L. Pfaff - Wauwatosa WI, US
Christopher J. Kolbe - Muskego WI, US
Robert J. Valenta - Stockport, GB
Eric P. Hamkins - Waukesha WI, US
International Classification:
F15B 13/04
US Classification:
91454
Abstract:
A valve assembly controls fluid flow between first and second ports of a hydraulic actuator and each of a supply line and a return line. A first electrohydraulic proportional valve is connected between the supply line and the first port, and second electrohydraulic proportional valve is connected between the supply line and the second port. A first counterbalance valve couples the second port to the return line and operates in response to pressure created by the first electrohydraulic proportional valve and the first port. A second counterbalance valve couples the first port to the return line and operates in response to pressure created by the second electrohydraulic proportional valve and the second port. Thus operation of the first counterbalance valve is slaved to the first electrohydraulic proportional valve, and the second counterbalance valve is slaved to the second electrohydraulic proportional valve.

Command Based Method For Allocating Fluid Flow From A Plurality Of Pumps To Multiple Hydraulic Functions

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US Patent:
20110308242, Dec 22, 2011
Filed:
Jun 13, 2011
Appl. No.:
13/158631
Inventors:
Joseph L. Pfaff - Wauwatosa WI, US
Eric P. Hamkins - Waukesha WI, US
Corey K. Quinnell - West Allis WI, US
International Classification:
F15B 13/02
US Classification:
60327
Abstract:
Fluid from two pumps is allocated to a plurality of hydraulic actuators based on a plurality of flow commands, each specifying a desired amount of flow to be applied to a different hydraulic actuator. For a given hydraulic actuator, the allocation involves (1) determining an apportionment of the desired amount of flow, if no other hydraulic actuator is active, and (2) altering the apportionment in response to all the plurality of flow commands, and (3) using the altered apportionment to determine a first amount of the flow for one pump to provide and a second amount of the flow for the other pump to provide. The process is repeated for all the hydraulic actuators. Supply valves for each hydraulic actuator are controlled by the associated first and second amounts and each pump is controlled in response to either the first or second amounts for all the hydraulic actuators.
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Eric P Hamkins from Placerville, CA, age ~63 Get Report