| 摘要 |
The distal end part of an arm 5 is turnably and removably connected to the distal end part of a base part 5 through a connection mechanism 7 . An engagement recess 46 whose upper part opposing the arm 5 is open, is formed in a basal end part of the base part 2 . The arm 5 is provided at its basal end part with an engagement pin 8 capable of fitting in the engagement recess 46 when the arm 5 is turned to an attachment position. A lock lever 6 for pressing the engagement pin 8 against the bottom part of the engagement recess 46 under the biasing force of a coiled spring 9 , is turnably disposed at the distal end part of the base part 2 through a support pin 103 . The lock lever 6 is provided at its distal end part with a pressing part 67 for pushing up the engagement pin 8 so as to escape from the engagement recess 46 when the lock lever 6 is turned clockwise against the biasing force of the coiled spring 9.
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