# US 2021/0340732 A1 · Work machine

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- Number: US 2021/0340732 A1
- Document ID: US20210340732A1
- Status: Published application
- Kind: A1
- Application number: 17/272,692
- Filed: 2019-12-11
- Published: 2021-11-04
- Earliest claimed: 2019-03-08
- Assignees: Hitachi Construction Machinery Co., Ltd.
- Applicants: Hitachi Construction Machinery Co., Ltd.
- Inventors: Shota IMAMURA; Yuji NAGASHIMA
- Web page: https://patentgrep.com/patent/US20210340732A1

## CPC

- E02F 9/24: Safety devices {, e.g. for preventing overload (E02F9/226 takes precedence)}
- B60K 26/02: of initiating means or elements
- B60K 35/10: Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
- B60K 35/28: characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
- B60K 35/29: Instruments characterised by the way in which information is handled, e.g. showing information on plural displays or prioritising information according to driving conditions
- B60K 35/81: for controlling displays
- E02F 9/16: Cabins, platforms, or the like, for drivers ({for motor vehicles in general B62D33/06}, for cranes B66C13/54)
- E02F 9/26: Indicating devices {(E02F5/145 takes precedence)}
- B60K 35/23: Head-up displays [HUD] (optical aspects of head-up displays G02B27/01)
- B60K 2360/167: Vehicle dynamics information
- B60K 2360/168: Target or limit values
- B60K 2360/178: Warnings
- B60K 2360/1876: according to vehicle situations
- E02F 3/32: working downwardly and towards the machine, e.g. with backhoes
- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G02B 2027/0141: {characterised by the informative content of the display}
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The present invention provides a working machine that makes it possible to alert its operator to cautions properly without obstructing the view of the operator. The working machine includes a cab for its operator to ride in, a projection device that projects image light to form an image of cautions to an operator who operates the working machine, a display unit that displays image light projected by the projection device, state detection element to detect a state of the working machine, and a controller that controls the projection device so that a manner of displaying the cautions on the display unit will change depending on the state of the working machine detected by the state detection element.

## Claims

### Claim 1

A working machine provided with a cab for its operator to ride in, comprising:
a projection device that projects image light to form an image of cautions to an operator who operates the working machine;
a display unit that displays image light projected by the projection device;
state detection element to detect a state of the working machine; and
a controller that controls the projection device so that a manner of displaying the cautions on the display unit will change depending on the state of the working machine detected by the state detection element.

### Claim 2 (depends on 1)

The working machine according to claim 1, comprising a lock operating element that allows the operator to switch between a locked state in which operation of the working machine is disabled and an unlocked state in which operation of the working machine is enabled;
wherein in a case where the lock operating element is in the unlocked state, the controller displays the cautions on the display unit in a second display manner in which the cautions are more likely not to obstruct the view of the operator than in a first display manner of displaying the cautions in a case where the lock operating element is in the locked state.

### Claim 3 (depends on 2)

The working machine according to claim 2, comprising a momentary switch that is set in an ON state only while the switch is operated by the operator and set in an OFF state in a case where the operator stops the switch operation;
wherein in a case where the momentary switch is in the ON state even with the lock operating element remaining in the locked state, the controller displays the cautions on the display unit in the second display manner.

### Claim 4 (depends on 2)

The working machine according to claim 2,
wherein the second display manner is any hiding, displaying smaller than displayed in the first display manner, and displaying near edges of a window relative to a display position in the first display manner.