JPH0229937U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the locking device of the present invention;
The figure is a cross-sectional view, Figure 3 is a diagram for explaining the engagement between the latch of the lock and the circumferential groove of the plug, and Figure 4 is a diagram showing how the present invention was applied to the connecting rod that connects the lid body to the frame body. FIG. 7 is a diagram for explaining another applied example. On the other hand, FIG. 5 is a diagram showing a locking structure equipped with a lock rotation prevention mechanism. 1: Lid, 2: Burl insertion hole, 4: Bottom plate, 7
: Lock member, 12: Frame, 14: Lock seat, 16: Plug, 19, 48: Engagement groove, 21, 49: Latch,
22, 50: lock, 41: recess, 42: bolt insertion hole, 46: connecting rod.

Claims (1)

[Claims for Utility Model Registration] 1. A locking member that engages with the lock seat of the frame and a plug that controls the rotation of the locking member are disposed on the bottom plate of the concave portion provided on the periphery of the lid. In the cover for underground structures, a lock equipped with a latch that can move forward and backward and engages with an engagement groove carved on the side surface around the head of the plug is removably arranged on the bottom plate of the crowbar insertion hole. Features a locking device for underground structure lids. 2. In a lid for an underground structure in which a connecting rod connecting the lid and the frame is disposed in a recessed part provided on the upper surface of the lid, an engagement carved on a side surface around the head of the connecting rod is provided. A locking device for a lid for an underground structure, characterized in that a lock having a latch that locks in a groove and moves forward and backward is removably disposed in the recess.