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US 2026/0110326 A1Published application
Anti-loosening wedge washer device
AssigneeGeo Sekkei Corporation
InventorTakao TSUKUI
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AssigneeGeo Sekkei Corporation
InventorTakao TSUKUI
Estimating the term…
This invention provides an inexpensive anti-loosening wedge washer device that can firmly and permanently prevent loosening caused by aging, such as wood shrinkage, in joints of wooden buildings using bolts and nuts. The device compensates for and prevents screw loosening due to shrinkage of joined members by increasing the washer's thickness. The washer has a truncated cone-shaped lid, and a truncated cone-shaped collar protrudes coaxially with the concave bolt hole. An annular wooden wedge, having a volume larger than that of the tapered annular space inside the washer, is pressed inwardly by screw tightening. The bulging restoring force of the compressed wooden wedge compensates for the shrinkage of the joined members. As a result, gaps caused by wood thinning are absorbed by the increased washer thickness, enabling long-term prevention of loosening in the joint.
An anti-loosening wedge washer device that compensates for and prevents screw loosening caused due to shrinkage of the joined member, by thickening the washer, wherein the washer has a conical cap-shaped configuration, with a tapered collar protruding coaxially with the concave-side bolt insertion hole, and with an annular tapered space formed within the washer, the annular tapered space is pre-filled with an annular wooden wedge exceeding its inner volume, which is pressed inwardly by the bolt tightening action during fastening, thereby enabling the shrinkage of the joined members to be compensated by the bulging restoring force of the annular wooden wedge stored within the washer.
Dependencies are inferred from the claim text.