Door damper
First Claim
1. A door damper comprising:
- a cylindrical body, which is open on a first side thereof and has a bumper on a second side side thereof;
a return spring, which is inserted into the body;
a spring holder, which supports the return spring;
a piston, which is inserted into the spring holder;
a check valve, which is installed between the spring holder and the piston;
a piston rod, which is coupled to one side of the piston and protrudes outside the body;
an oil distributor, which has the piston rod passing therethrough and is in contact with the piston;
a sponge, which is in contact with the oil distributor, has the piston rod passing therethrough, and is fixed to a bushing; and
a cover, which covers the first side of the body together with an oil seal contacting the bushing,wherein the piston includes a safety check valve therein, which is opened in cooperation with the check valve installed between the spring holder and the piston when a pressure higher than a design pressure is applied.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a door damper, in which a safety check valve is installed in consideration of the case in which an impact exceeding a design pressure will be applied, thereby absorbing the impact to enable a door to be closed safely and smoothly. In the door damper, a safety check valve is installed in a piston, and thus is opened in cooperation with another check valve installed between a spring holder and the piston when the pressure exceeding a design pressure is applied. Thereby, when the impact exceeding the design pressure occurs, the safety check valve can absorb the impact to prevent damage. A channel can be adjusted by only ridges formed on an outer circumference of the check valve, so that productivity can be improved thanks to easy tolerance management. Further, an oil seal is not contracted or deformed in spite of long-term use.
24 Citations
11 Claims
-
1. A door damper comprising:
- a cylindrical body, which is open on a first side thereof and has a bumper on a second side side thereof;
a return spring, which is inserted into the body;
a spring holder, which supports the return spring;
a piston, which is inserted into the spring holder;
a check valve, which is installed between the spring holder and the piston;
a piston rod, which is coupled to one side of the piston and protrudes outside the body;
an oil distributor, which has the piston rod passing therethrough and is in contact with the piston;
a sponge, which is in contact with the oil distributor, has the piston rod passing therethrough, and is fixed to a bushing; and
a cover, which covers the first side of the body together with an oil seal contacting the bushing,wherein the piston includes a safety check valve therein, which is opened in cooperation with the check valve installed between the spring holder and the piston when a pressure higher than a design pressure is applied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- a cylindrical body, which is open on a first side thereof and has a bumper on a second side side thereof;
Specification