JPH049230U

JPH049230U -

Info

Publication number: JPH049230U
Application number: JP4923590U
Authority: JP
Priority date: 1990-05-11
Filing date: 1990-05-11
Publication date: 1992-01-27
Anticipated expiration: 2005-05-11
Also published as: JP2511041Y2

Description

[Brief explanation of the drawing]

第１図乃至第７図は本考案の一実施例を説明す
るためのもので、第１図は部分断面を含む正面図
、第２図は第１図のＡ−Ａ線に沿う拡大断面図、
第３図はシヤフト部分の分解斜視図、第４図及び
第５図はボルト緩め動作時の各状態を示す部分断
面を含む部分正面図、第６図及び第７図はボルト
緩め後の非常動作時の各状態を示す部分断面を含
む部分正面図である。第８図乃至第１２図は従来
のボルト緩め装置を説明するためのもので、第８
図乃至第１１図は正常動作時の各状態での部分断
面を含む部分正面図、第１２図は非常動作時での
部分断面を含む部分正面図である。１，２……外部部材、３……ボルト、３ａ……
頭部、７……シヤフト、８……凹部、９……シヤ
フト駆動部、１０……ピン、１１……ストツパ部
材。 1 to 7 are for explaining one embodiment of the present invention, FIG. 1 is a front view including a partial cross section, and FIG. 2 is an enlarged sectional view taken along line A-A in FIG. 1. ,
Figure 3 is an exploded perspective view of the shaft part, Figures 4 and 5 are partial front views including partial cross sections showing various states during bolt loosening operation, and Figures 6 and 7 are emergency operations after bolt loosening. FIG. 3 is a partial front view including a partial cross section showing various states at the time of use. 8 to 12 are for explaining the conventional bolt loosening device.
11 are partial front views including partial cross sections in each state during normal operation, and FIG. 12 is a partial front view including partial cross sections during emergency operation. 1, 2... External member, 3... Bolt, 3a...
Head, 7...shaft, 8...recess, 9...shaft drive section, 10...pin, 11...stopper member.

Claims

[Scope of claim for utility model registration] Directly above the head of a bolt screwed into an external member,
It is arranged so that it can move up and down at a fixed stroke along the center line of the bolt, and is rotatable around the center line of the bolt, and the bolt is loosened by fitting the head of the bolt appropriately on the lower end surface and rotating upward. a shaft having a recess; a shaft drive unit that supports the shaft and drives it vertically and rotationally; the shaft is loosely fitted into the lower end of the shaft so as to be able to move up and down at a constant stroke, and the lower end is normally pushed into the recess of the shaft by its own weight; a protruding pin; and a stopper member fixedly arranged at a fixed position near the shaft and regulating the relative position of the pin within the shaft when the shaft is raised to an upper limit position to a position where the lower end thereof protrudes into the recess of the shaft. A bolt loosening device characterized by comprising: