Construction machinery

The work light displacement mechanism on hydraulic excavators addresses the issue of reduced workspace and visibility by allowing the work light to be positioned away from the boom cylinder bracket, thereby improving the efficiency and visibility of lubrication work.

JP7864608B2Active Publication Date: 2026-05-25HITACHI CONSTRUCTION MACHINERY TIERRA CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
HITACHI CONSTRUCTION MACHINERY TIERRA CO LTD
Filing Date
2022-09-30
Publication Date
2026-05-25

AI Technical Summary

Technical Problem

The work lights on hydraulic excavators are typically located on the front side of the boom cylinder bracket, narrowing the work space and reducing visibility during lubrication, thereby decreasing the efficiency of lubrication work on the connecting pins.

Method used

A work light displacement mechanism is implemented to move the work light between a working position and a lubrication position, allowing it to be positioned further away from the boom cylinder bracket, thereby increasing the workspace and improving visibility during lubrication.

Benefits of technology

The work light displacement mechanism enhances the efficiency and visibility of lubrication work by providing a larger workspace and ensuring adequate illumination of the lubrication nipple, even during nighttime operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

To improve workability when performing greasing work on a connecting pin that connects a boom and a boom cylinder.SOLUTION: A pair of boom cylinder brackets 12F are provided on a lower surface of a boom 12 constituting a work device 11. A rod side mounting portion 15E of a boom cylinder 15 and the pair of boom cylinder brackets 12F are rotatably connected via a rod side connecting pin 15F. A greasing nipple 19 is provided on the rod side mounting portion 15E. A work lamp 20 is disposed in front of the greasing nipple 19 adjacently to the pair of boom cylinder brackets 12F. The boom 12 is provided with a work lamp displacement mechanism 23 that changes a position of the work lamp 20. The work lamp displacement mechanism 23 displaces the work lamp 20 between a work position where light is irradiated toward a bucket 14 and a greasing position where a work space for greasing work is secured between the work lamp displacement mechanism 23 and the greasing nipple 19.SELECTED DRAWING: Figure 3
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