Grab bucket

The grab bucket's proximity gap sensor mechanism addresses the delayed opening issue by switching to a normal operation valve when the gap is met, enhancing operational efficiency and reducing cycle time.

JP2026084197APending Publication Date: 2026-05-21大须贺 忠男
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
大须贺 忠男
Filing Date
2024-11-10
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

The existing grab buckets experience delayed opening during the release operation due to the extended time required for the hydraulic fluid to reduce pressure after the impact between the upper frame and intermediate movable frame, leading to an unnatural operation feeling and increased cycle time.

Method used

A grab bucket equipped with a proximity gap sensor mechanism that detects the proximity gap between the upper and intermediate movable frames, switching to a normal operation valve mechanism when the gap reaches a predetermined value, allowing faster hydraulic fluid flow and reducing the time for the grab to open.

Benefits of technology

The solution minimizes the time extension for the grab to open by mitigating the impact between the upper and intermediate movable frames, improving operability and reducing cycle time.

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  • Figure 2026084197000001_ABST
    Figure 2026084197000001_ABST
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Abstract

The present invention provides a grab bucket that mitigates the impact between the upper frame and the intermediate movable frame when the grab is released, and reduces the response delay until the grab begins to open. [Solution] The system is equipped with a proximity gap sensor mechanism 10 that detects the proximity gap between the upper frame 6 and the intermediate movable frame 5. When the grab is released, if the proximity gap has not reached a predetermined value, only a small amount of hydraulic fluid is circulated. When the proximity gap reaches a predetermined value, the normal amount of hydraulic fluid is circulated. This reduces the flow velocity of the hydraulic fluid 23 until the upper frame 6 and the intermediate movable frame 5 come into contact or are on the verge of contact, thereby mitigating the impact. After that, the flow velocity of the hydraulic fluid 23 is returned to normal, shortening the time until the grab begins to open.
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