Patent NZ-336967-A (NZ)
Title: Hydraulic automatic-shock-absorbing hinge device which can close the door slowly or in a state of emergency such as during a fire
Inventor: JANG JONG BOK
IPC: E05F3/04
Filed: 1999-07-30
Abstract: An automatic hydraulic shock-absorbing hinge device comprising: An outer moving body (11) formed integrally with one coupling piece (10), including the first unevenness portion (50) formed vertically on the upper end and inner circumference portion of the outer moving body(11); A cylinder (12) disposed in the inner lower portion of the outer moving body (11) including a "[" shaped flowing path (20) on the one side thereof, and an oil supplement tank (21) on the outer circumference thereof; An oil leakage-preventing cover (33) threadly engaged with the outer moving body (11) on the lower end portion of the body for sealing the lower end of the cylinder (12) ; A stationary pipe (14) threadly engaged and fixed with the outer moving body (11) on the middle and inner circumference portion of the body, and the stationary pipe including a pair of the left-hand inclinated guide protrusions (13) opposedly with each other; An elevating pipe (17) inserted within the stationary pipe (14), and the elevating pipe including a pair of the left- hand spiral guide grooves (15) on the outer circumference and opposed portions with each other and a pair of the right-hand spiral grooves (16) on the inner circumference and opposed portions with each other, so that the pair of the left-hand spiral grooves (15) are engaged and guided with the guide protrusions (13) of the stationary pipe; A piston (18) disposed on the lower end of the elevating pipe (17) and inserted in the cylinder (12) for being moved upwardly and downwardly, and the piston including a check valve (34) on the middle and end portion thereof; A rotational shaft (40) disposed on the upper portion of the outer moving body (11), and the shaft (40) including a pair of the right-hand spiral cams (41) protruded and opposed with each other on the lower portion of the shaft and a restricting wheel (42) having an oil leakage-preventing O-ring (42a) fitted therearound on the upper end of the cams (41), wherein the pair of the right-hand spiral cams (41) can be engaged and guided with the right-hand spiral guide grooves (16) of the elevating pipe (17) ; A support pipe (51) for supporting the shaft (40), including the second unevenness portion (50a) formed vertically on the lower and outer circumference portion of the support pipe (51) and engaged with the first unevenness portion (50) for preventing the outer moving body (11) and the support pipe (51) from idling with each other, and a recess groove (51a) formed along and on the outer circumference of the support pipe(51) and matched with a vertical removal-preventing snab ring (51b); First cap (60) and second cap (60a) fitted, respectively, on both upper and lower end of another coupling piece (10a); An oil leakage-preventing cover (33) around which the second cap (60a) is fitted; A coil spring (61) within the second cap (60a), of which one end is fixed on the oil leakage preventing cover (33), and of which another end is fixed on the lower cover (62).