Title:
レール締結用ボルト緩み止めユニット
Document Type and Number:
Japanese Patent JP7286177
Kind Code:
B2
Abstract:
To provide a bolt loosening preventing unit for rail fastening which suppresses loosening of a hexagonal bolt for fastening while simply fitting a fixing cover to a bolt cap while visually observing the relative position of a bolt cap and the fixing cover.SOLUTION: A bolt cap 110 has twelve bolt fitting vertical groove parts provided at equal intervals on the cap inner peripheral side to be fitted to six bolt corner parts Ff1a formed on a fastening bolt Ff1, and 45 engaging projection parts provided at equal intervals on the cap outer peripheral side; a fixing cover 120 has the same number of engaging vertical groove parts as the number of engaging projection parts to be engaged with the engaging projection parts of the bolt cap 110; a cap side identification mark indicating a groove bottom position of the bolt fitting vertical groove part is formed in the vicinity of each bolt fitting vertical groove part; adjacent cap side identification marks are different identification marks; and a cover side groove bottom identification mark indicating a groove bottom position of the engaging vertical groove part is formed in the vicinity of the engaging vertical groove part.SELECTED DRAWING: Figure 2B
Inventors:
Eiichi Arai
Application Number:
JP2020207484A
Publication Date:
June 05, 2023
Filing Date:
December 15, 2020
Export Citation:
Assignee:
Railroad Track Industry Co., Ltd.
International Classes:
E01B9/12; F16B39/10
Domestic Patent References:
| JP2007107701A | ||||
| JP8232938A | ||||
| JP2011241865A | ||||
| JP2016109277A | ||||
| JP52170958U | ||||
| JP5017665A |
Attorney, Agent or Firm:
Patent Attorney Corporation Towa International Patent Office