Title:
ハンドホール
Document Type and Number:
Japanese Patent JP6920687
Kind Code:
B2
Abstract:
To provide a hand hole capable of raising horizontal direction bearing force without causing weight increase or degradation of cylindrical blocks.SOLUTION: In a hand hole which is constructed by piling up a plurality of cylindrical blocks (10), taper surfaces (12c, 12f) constituting an inclination receptacle structure are formed, respectively, by having the same inclination angle on a lower surface of an upper side cylindrical block and an upper surface of a lower side cylindrical block to contact each other among two cylindrical blocks to be joined to each other.SELECTED DRAWING: Figure 1
Inventors:
Shinya Sakata
Tatsuo Tadokoro
Yuichi Watanabe
Tatsuo Tadokoro
Yuichi Watanabe
Application Number:
JP2017117311A
Publication Date:
August 18, 2021
Filing Date:
June 15, 2017
Export Citation:
Assignee:
East Japan Railway Company
Ageo Co., Ltd.
Manhole Shokai Co., Ltd.
Ageo Co., Ltd.
Manhole Shokai Co., Ltd.
International Classes:
H02G9/10; H02G1/06
Domestic Patent References:
| JP2015004163A | ||||
| JP4092054U | ||||
| JP10285774A | ||||
| JP2009256924A | ||||
| JP57147350U |
Foreign References:
| US5081802 |
Attorney, Agent or Firm:
Gwangyang International Patent Office