Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Hinge – Including means to hold or retard hinged members against...
Reexamination Certificate
1998-09-17
2001-03-27
Knight, Anthony (Department: 3626)
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Hinge
Including means to hold or retard hinged members against...
C016S054000, C016S050000
Reexamination Certificate
active
06205619
ABSTRACT:
This invention relates to an automatic hydraulic shock-absorbing hinge device. More particularly, it relates to the hinge device which can close the door slowly or automatically under a shock-absorbing state or a state of emergency such as a high-temperature environment due to a fire.
BACKGROUND OF THE INVENTION
In the prior art, a hinge has played only a connection between a door and a framework thereof. The hinge is made separatedly from a shock-absorbing device which moves the door to be closed slowly and automatically and which is typically located on the upper portion of the door and connected between the door and the framework.
The shock-absorbing device is so complicated that trouble shooting thereof frequently takes place. And the device has to be installed only onto the upper portion of the door in a manner that the device is exposed out of the door. Therefore, in the shock-absorbing device of the prior art, there are problems in the installation on the restricted area, from an aesthetic point of view and high cost.
In order to solve the above problems, the inventor of the present invention disclosed Korean Patent No. 156093 which had been granted and entitled “HYDRAULIC AUTOMATIC SHOCK-ABSORBING HINGE” wherein the hinge has a piston on the end thereof and a cylinder having a reciprocating pipe therein. The piston has a switching valve and a check valve. A right-hand spiral groove and a left-hand spiral groove are formed opposedly with each other and on the reciprocating pipe.
A right-hand spiral cam is protruded on one side of the rotational shaft. And the right-hand spiral cam is engaged with the right-hand spiral groove and a bolt threadly engaged with the cylinder is inserted in the left-hand spiral groove to keep the balance under the movement of the cam in the upward or downward direction.
The hydraulic hinge having the construction mentioned above, has a good effect of shocking-absorbing. But when the right-hand spiral groove is moving upwardly or downwardly along the right-hand spiral groove such that buffering effect takes place by hydraulic pressure, the spiral cam applies a highly excessive load to the rotational shaft on the one side thereof, so that the shaft and the bolt engaged threadly with the cylinder may be broken out or cut out.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide an automatic hydraulic shock-absorbing hinge device which is designed such that when moving upwardly or downwardly along the right-hand spiral groove, the right-hand spiral cam can apply the load to the rotational shaft uniformly and as little as possible.
In accordance with the invention, an automatic hydraulic shock-absorbing hinge device comprises: an outer moving body formed integrally with one coupling piece, including the first uneveness portion formed vertically on the upper end and inner circumference portion of the outer moving body. A cylinder disposed in the inner lower portion of the outer moving body includes a “|” shaped flowing path on the one side thereof, and a oil supplement tank on the outer circumference thereof. An oil leackage-preventing cover threadly engages with the outer moving body on the lower end portion of the body for sealing the lower end of the cylinder. A stationary pipe threadly engages and is fixed with the outer moving body on the middle and inner circumference portion of the body, and the stationay pipe includes a pair of the left-hand inclinated guide protrusions opposedly with each other. An elevating pipe inserted within the stationary pipe. The elevating pipe includes a pair of the left-hand spiral guide grooves on the outer circumference and opposed portions with each other and a pair of the right-hand spiral grooves on the inner circumference and opposed portions with each other. The pair of the left-hand spiral grooves are engaged and guided with the guide protrusions of the stationary pipe. A piston disposed on the lower end of the elevating pipe and is inserted in the cylinder for being moved upwardly and downwardly. The piston includes a check valve on the middle and end portion thereof. A rotational shaft is disposed on the upper porion of the outer moving body. The shaft includes a pair of the right-hand spiral cams protruded and opposed with each other on the lower portion of the shaft and a restricting wheel having an oil leakage-preventing 0-ring fitted therearound on the upper end of the cams, wherein the pair of the right-hand spiral cams can be engaged and guided with the right-hand spiral guide grooves of the elevating pipe. A support pipe for supporting the shaft, includes the second uneveness portion formed vertically on the lower and outer circumference portion of the support pipe and engaged with the first uneveness portion for preventing the outer moving body and the support pipe from idling with each other. A recess groove formed along and on the outer circumference of the support pipe and matched with a vertical removal-preventing snab ring. A first cap and second cap fitted respectively, on both upper end and lower end of another coupling piece. An oil leakage preventing cover around which the second cap is fitted includes a coil spring within the second cap, of which one end is fixed on the oil leackage preventing cover, and of which another end is fixed on the lower cover.
In a preferred embodiment, the piston may be formed independently from the elevating pipe. In this case, the piston and elevating pipe are connected with each other by a connecting means which may be integrally formed with the piston.
In accordance with such a construction, when the elevating pipe moves upwardly or downwardly, the load produced by hydraulic pressure can be applied uniformly to the shaft. Therefore, it is not possible to break out or cut out the spiral cam formed on the shaft, the spiral guide grooves on the elevating pipe, and the guide protrusion on the stationary pipe. As a result the hinge device of the present invention has a relatively longer life-time than the prior art.
REFERENCES:
patent: 4155144 (1979-05-01), Koganei
patent: 4485522 (1984-12-01), Chen
patent: 5152029 (1992-10-01), Pai
patent: 5419013 (1995-05-01), Hsiao
patent: 5855040 (1999-01-01), Lin
patent: 156093 (1998-10-01), None
Jacobson Price Holman & Stern PLLC
Knight Anthony
Williams Mark
LandOfFree
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