| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the unsteadiness of a door in the opening and closing direction of the door by providing a slide holder urged by a spring in a box provided in a recess in the floor surface to lock a trap bar having an inclined surface at the lower end thereof. SOLUTION: In a slide holder 4, there are provided a vertical surface 44, locking surface 45, inclined part of the surface 45, and engaging surface 46. A stopper of the holder 4 is provided on the inner wall of a box 3. An urging inclined surface 24 is formed at the lower end of an insertion body 22 and a surface to be locked 25 is formed on both sides of the lower end of the body 22. The holder 4 together with a spring is incorporated into a box 31 fitted in a recess in the floor surface and fixed at a predetermined position on the floor surface together with a cover 33. If a lower end of the body 22 is brought into an opening 34, the surface 24 is first brought into line contact with the upper end of the surface 44 to retract the holder 4 against the force of the spring and finally the surface 25 of the body 22 is brought into contact with the surface 45 of the holder 4. As a result, there is no need to finely adjust the position of the holder 4. |
