A LOCKING DEVICE OF MANHOLE SUPPORT FRAME AND MANHOLE COVER

摘要

PURPOSE: A locking device of a manhole support frame and a manhole cover is provided to facilitate the locking of a manhole cover through a simple one-touch operation by pressurizing the inner circumference of a manhole support frame with a locking lever. CONSTITUTION: A locking device of manhole support frame and a manhole cover comprises a locking operation utensil(20), a lever holder(30), a holder cover(40), a plurality of locking levers(50), and a plurality of rotary supports(60). The locking operation utensil passes through the center of a manhole cover(10) and operates a locking lever by vertically moving through a selective rotation operation. The lever holder comprises a lever insertion groove on the bottom and is installed on the outside of a joint shaft. The holder cover is inserted into the outside of the joint shaft and integrally adheres to the bottom of the lever holder. A locking lever comprises a driver(51), a rotary support part(52), and a pressurization support protrusion(53). One side of the driver is inserted into the lever insertion groove. The rotary support part is upwardly protruded from the other side of the driver. The pressurization support protrusion is downwardly inclined on the front end of the rotary support part. The pressurization support protrusion selectively pressurizes and supports the inner circumference of the manhole support frame. The rotary support is regularly protruded on the bottom of the manhole cover along the circumferential direction and rotatably supports the rotary support part.