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A platform for research: civil engineering, architecture and urbanism
BLOCKING PLUG LOCK DEVICE FOR MANHOLE COVER KEY HOLE
PROBLEM TO BE SOLVED: To provide a key hole blocking plug having high crime prevention effect which, upon installation thereof, prevents a flange portion exposed on an upper surface of a manhole cover from being broken easily.SOLUTION: A flange portion 21 of a main body 2 includes a circular flange portion 21b covering a circular hole portion of a key hole and a pair of wing portions 21c covering a longitudinal hole portion 102b. The wing portions 21c extends so as to gradually reduce their thicknesses radially outward from the opposite edge of the circular flange portion 21b. An arc-shaped fragile groove portion 21d is formed at a boundary portion between the base portion of the wing portion 21c and the circular collar portion 21b. A configuration that is difficult to destroy is established such that when a vandalism act is made such as driving a tool between the upper surface of the manhole cover 101 and the flange portion, the wing portion 21c easily turns up in the groove portion 21d, and therefore the engaging force with the tool is weakened.SELECTED DRAWING: Figure 5
【課題】装着時にマンホール蓋の上面に露出する鍔部を容易に破壊することができない防犯効果の高い鍵孔閉塞栓を提供する。【解決手段】本体２の鍔部２１は、鍵孔の円形孔部を覆う円形鍔部２１ｂと、長孔部１０２ｂを覆う一対の翼部２１ｃとを具備する。翼部２１ｃは、円形鍔部２１ｂの対向縁から半径方向外方へ徐々にその厚さを減じるように延出する。翼部２１ｃの基部と円形鍔部２１ｂとの境界部に円弧状の脆弱な溝部２１ｄが形成される。マンホール蓋１０１の上面と鍔部との間に工具を打ち込むような破壊行為が行われると、翼部２１ｃが、溝部２１ｄにおいて容易にめくり上がることにより、工具との係合力を弱め、破壊を困難にする構成とした。【選択図】図５
BLOCKING PLUG LOCK DEVICE FOR MANHOLE COVER KEY HOLE
PROBLEM TO BE SOLVED: To provide a key hole blocking plug having high crime prevention effect which, upon installation thereof, prevents a flange portion exposed on an upper surface of a manhole cover from being broken easily.SOLUTION: A flange portion 21 of a main body 2 includes a circular flange portion 21b covering a circular hole portion of a key hole and a pair of wing portions 21c covering a longitudinal hole portion 102b. The wing portions 21c extends so as to gradually reduce their thicknesses radially outward from the opposite edge of the circular flange portion 21b. An arc-shaped fragile groove portion 21d is formed at a boundary portion between the base portion of the wing portion 21c and the circular collar portion 21b. A configuration that is difficult to destroy is established such that when a vandalism act is made such as driving a tool between the upper surface of the manhole cover 101 and the flange portion, the wing portion 21c easily turns up in the groove portion 21d, and therefore the engaging force with the tool is weakened.SELECTED DRAWING: Figure 5
【課題】装着時にマンホール蓋の上面に露出する鍔部を容易に破壊することができない防犯効果の高い鍵孔閉塞栓を提供する。【解決手段】本体２の鍔部２１は、鍵孔の円形孔部を覆う円形鍔部２１ｂと、長孔部１０２ｂを覆う一対の翼部２１ｃとを具備する。翼部２１ｃは、円形鍔部２１ｂの対向縁から半径方向外方へ徐々にその厚さを減じるように延出する。翼部２１ｃの基部と円形鍔部２１ｂとの境界部に円弧状の脆弱な溝部２１ｄが形成される。マンホール蓋１０１の上面と鍔部との間に工具を打ち込むような破壊行為が行われると、翼部２１ｃが、溝部２１ｄにおいて容易にめくり上がることにより、工具との係合力を弱め、破壊を困難にする構成とした。【選択図】図５
BLOCKING PLUG LOCK DEVICE FOR MANHOLE COVER KEY HOLE
マンホール蓋の鍵孔用溝付閉塞栓錠装置
KATO KOJI (author) / KUNIOKA TATSUYA (author) / TAKAHASHI MAKOTO (author) / YOSHIZUMI YU (author)
2018-08-02
Patent
Electronic Resource
Japanese