Resources Contact Us Home
Door damper

Image Number 4 for United States Patent #7861371.

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.

  Recently Added Patents
Plant disease control composition and its use
Controller with screen
Image decolorizing device
Method and system for providing intelligent call rejection and call rollover in a data network
Mounting structure, electro-optical apparatus, and touch panel
Hydrogen generation device and fuel cell system
Compositions and methods for inhibition of MMP13:MMP-substrate interactions
  Randomly Featured Patents
Drive unit for motor vehicles
Fuel strainer assembly
Method for producing an optoelectronic semiconductor chip and optoelectronic semiconductor chip
Games machine with mechanical counters as laid down by regulations, and with electronic payment mechanism
Optical XOR gate
Process for producing BGA type semiconductor device, TAB tape for BGA type semiconductor device, and BGA type semiconductor device
Method and apparatus for displaying information in a vehicle
Time focused induction of preferential necrosis
End piece for the filling of a tank
Pressurization system for fire extinguishers