TUBULAR KEY Russian patent published in 2018 - IPC E05B19/00 

FIELD: construction.

SUBSTANCE: tubular key consists of elongated hollow bushing 1, in which there is blind hole 2, and on the end there are grooves of key part 3. On the other side the hollow bushing has a rounded shape of end face 4 and vertically arranged split groove 5 having a longer length at the top on the bushing. In the vertically arranged split groove in the bushing there is bonded key plate 6. Inside blind hole 2 in the upper groove in the bushing there is fixed elongated projection 7 and also in the groove on the bushing there is rectangular projection 8, which is a single component of inner elongated projection 7 and plate 6. Coaxially with the plate on both sides on the bushing there are flat depressions 9, where in the centre of the planes and perpendicular to the plate there is technological hole 10 for rivet 11. Edges of the rivet holes have countersink 12 on the planes of depression on both sides on the bushing, which serves to secure the riveting of the rivet with the key structure. Handle of key plate 6 has an elongated rectangular shape, on which the edges are rounded. On one side there is opening 13 in the plate, and on the other side the plate has lobe14 in the form of a strip with a slight increase in the top, which is inner elongated projection 7 and upper rectangular projection 8 in the key. At the end between the projections in the plate there is short horizontal split groove 15, and in the places of contact of the lower inner wall of the bushing with the key plate there is second short split groove 16 in the horizontal plane. Width of the upper and the lower horizontal grooves in plate 6 has the same thickness with the wall of key bushing 1.

EFFECT: tubular key refers to the keys used for rim locks, mortise locks and padlocks.

1 cl, 8 dwg