# US 8,543,298 B2 · Operator interface with tactile feedback > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,298 B2 - Document ID: US8543298B2 - Status: Granted - Kind: B2 - Application number: 13/152,632 - Filed: 2011-06-03 - Published: 2012-12-06 - Granted: 2013-09-24 - Earliest claimed: 2011-06-03 - Assignees: Caterpillar Inc. - Applicants: Matthew E. Kontz; Jeffrey L. Kuehn; Rustin G. Metzger; David E. Ault - Inventors: Matthew E. Kontz; Jeffrey L. Kuehn; Rustin G. Metzger; David E. Ault - Web page: https://patentgrep.com/patent/US8543298B2 ## CPC - E02F 9/2004: {Control mechanisms, e.g. control levers (control levers per se G05G)} - E02F 3/84: Drives or control devices therefor {, e.g. hydraulic drive systems} - E02F 9/2264: {Arrangements or adaptations of elements for hydraulic drives} - E02F 9/264: {Sensors and their calibration for indicating the position of the work tool} - G05G 5/05: Means for returning or tending to return controlling members to an inoperative or neutral position, e.g. by providing return springs or resilient end-stops (G05G5/28 takes precedence) - G05G 9/047: the controlling member being movable by hand about orthogonal axes, e.g. joysticks {(for switches H01H25/04)} - E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00) - G05G: CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY ("Bowden" or like mechanisms F16C1/10; gearings or mechanisms not peculiar to this purpose F16H; speed changing or reversing mechanisms for gearings conveying rotary motion F16H59/00 - F16H63/00) ## Abstract An operator interface assembly for a machine includes a base, an operator input device, a first biasing member, and a second biasing member. The operator input device is operable to move in a direction in relation to the base. The first biasing member is operable to contact the operator input device at a first position and resist movement of the operator input device in the direction. The second biasing member is operable to contact the operator input device at a second position and resist movement of the operator input device in the direction. ## Claims ### Claim 1 An operator interface assembly for a machine, comprising: a base, an operator input device operable to move in a first direction in relation to the base to a second position and a third position, and operable to move in a second direction in relation to the base, the second direction opposite the first direction, to a fourth position and a fifth position, a first biasing member including a first spring end and a third spring end, and operatively associated with the base and wherein the first spring end is operable to contact the operator input device at the first position and resist movement of the operator input device in the first direction, and the third spring end is operable to contact the operator input device at the fourth position and resist movement of the operator input device in the second direction, a second biasing member including a second spring end and a fourth spring end, and operatively associated with the base and wherein the second spring end is operable to contact the operator input device at the second position and resist movement of the operator input device in the first direction, and the fourth spring end is operable to contact the operator device at the first position and resist movement of the operator input device in the second direction, and a position sensor configured to generate a position signal for generating a machine control command, the position signal indicative of the operator input device position, and wherein the first position, the second position, and the fourth position are different positions. ### Claim 2 (depends on 1) The operator interface assembly of claim 1, wherein the operator input device is pivotably connected to the base. ### Claim 3 (depends on 1) The operator interface assembly of claim 1, wherein the operator input device is slidingly connected to the base. ### Claim 4 (depends on 1) The operator interface assembly of claim 1, wherein the first biasing member includes a spring. ### Claim 5 (depends on 1) The operator interface assembly of claim 1, wherein the position sensor is an electronic position sensor configured to generate an electronic position signal indicative of the operator input device position. ### Claim 6 A machine, comprising: an implement, an implement actuation system configured to begin actuation of the implement as a function of an implement control signal, an operator interface assembly, including; a base, an operator input device operable to move in a first direction in relation to the base to a second position and a third position, and operable to move in a second direction in relation to the base, the second direction opposite the first direction, to a fourth position and a fifth position, a first biasing member including a first spring end and a third spring end, and operatively associated with the base and wherein the first spring end is operable to contact the operator input device at the first position and resist movement of the operator input device in the first direction, and the third spring end is operable to contact the operator input device at the fourth position and resist movement of the operator input device in the second direction, a second biasing member including a second spring end and a fourth spring end, and operatively associated with the base and wherein the second spring end is operable to contact the operator input device at the second position and resist movement of the operator input device in the first direction, and the fourth spring end is operable to contact the operator device at the first position and resist movement of the operator input device in the second direction, and an electronic position sensor operable to generate an electronic position signal indicative of the operator input device position, and a controller configured to generate a machine command signal as a function of the electronic position signal, and wherein the first position, the second position, the third position, the fourth position, and the fifth position are different positions. ### Claim 7 (depends on 6) The machine of claim 6, wherein: the implement actuation system includes a solenoid controlled valve operable to allow pressurized fluid flow to actuate the implement when in an open position, and the machine command signal initiates electric current flow to move the solenoid controlled valve to the open position. ### Claim 8 (depends on 6) The machine of claim 6, wherein the implement includes an earth moving blade. ### Claim 9 (depends on 6) The machine of claim 6, wherein the implement actuation system includes a hydraulic cylinder actuated through the flow of hydraulic fluid, the hydraulic cylinder operable to change the position of the implement. ### Claim 10 (depends on 6) The machine of claim 6, wherein the controller is configured to generate the machine command signal when the operator input device is in the third position or the fifth position. ### Claim 11 An operator interface assembly, comprising: a base including a first spring rest, a second spring rest, a first spring support, and a second spring support, a joystick pivotally connected to the base, the joystick operable to pivot in a first direction from a first position to a second position and a third position in relation to the base, and pivot in a second direction, the second direction opposite the first direction, from the first position to a fourth position and a fifth position in relation to the base, the joystick including a first tab having a first tab contact surface and a third tab contact surface, and a second tab having a second tab contact surface and a fourth tab contact surface, a first spring coiled around the first spring support and including a first spring end and a third spring end, wherein the first spring end contacts the first spring rest and the first tab contact surface when the joystick is in the first position; and the third spring end contacts the first spring rest and is a first offset distance from the third tab contact surface when the joystick is in the first position, and contacts the third tab contact surface when the joystick is in the fourth position, a second spring coiled around the second spring support and including a second spring end and a fourth spring end, wherein; the second spring end contacts the second spring rest and is a first offset distance from the second tab contact surface when the joystick is in the first position, and contacts the second tab contact surface when the joystick is in the second position; and the fourth spring end contacts the second spring rest and the fourth tab contact surface when the joystick is in the first position, and an electronic position sensor operable to generate an electronic position signal indicative of the joystick position for generating a machine command signal when the joystick is in the third position or the fifth position. ### Claim 12 (depends on 11) The operator interface assembly of claim 11, wherein: the second spring end includes a wide portion and a narrow portion, the wide portion contacts the second spring rest when the joystick is in the first position, and the narrow portion contacts the second tab contact surface when the joystick is in the second position. ### Claim 13 (depends on 11) The operator interface assembly of claim 11, wherein: the first spring support and the second spring support are symmetrical, and the second spring rest protrudes the first offset distance further than the first spring rest in a second direction, the second direction opposite the first direction. ### Claim 14 (depends on 11) The operator interface assembly of claim 11, wherein: the third spring end includes a wide portion and a narrow portion, the wide portion contacts the third spring rest when the joystick is in the first position, and the narrow portion contacts the third tab contact surface when the joystick is in the fourth position. ### Claim 15 (depends on 11) The operator interface assembly of claim 11, wherein: the first spring support and the second spring support are symmetrical, and the third spring rest protrudes the second offset distance further than the fourth spring rest in the first direction. ### Claim 16 A method for calibrating tactile feedback for an operator input device, comprising: moving the operator input device in a first direction in relation to a base from a first position to a second position against a resistive force from a first biasing member, contacting a second biasing member with the operator input device at the second position, the second biasing member resisting the movement of the operator input device in the first direction in the second position, generating a calibration signal when the operator input device is in the second position, generating a periodic position signal indicative of the position of the operator input device, and determining a desired position of the operator input device for triggering a machine command signal as a function of the most recent position signal when the calibration signal is generated, and generating a machine command signal when the position signal indicates the operator input device is in the desired position. ### Claim 17 (depends on 16) The method of claim 16, wherein generating a calibration signal includes inputting an operator confirmation on a confirmation input device. ### Claim 18 (depends on 16) The method of claim 16, wherein generating a calibration signal includes generating an automatic confirmation signal with a contact sensor. ### Claim 19 (depends on 16) The method of claim 16, wherein the contact sensor is a thin film sensor.