Automatic Door Closer Arm Assembly Cushioned Stop Design

The patent applies beforehand cushioning by installing a cushioning element (such as a rubber bumper or foam pad) on the stop before the connecting arm contacts it. This cushioning element absorbs the impact energy when the connecting arm reaches the limit position, preventing direct hard contact between metal parts. The cushioning element maintains reliable positioning while eliminating the banging noise generated by rigid contact, thus resolving the contradiction between reliability and noise reduction.

The patent applies self-service by designing a manual release mechanism where the user can directly manipulate the detent or plunger component with their hand to release the held door. Instead of requiring external tools like screwdrivers to adjust compression springs, the release mechanism allows the user to self-release the hold open function by simply pushing or pulling a release lever or button that directly actuates the detent. This eliminates the need for complex screw adjustments and tool usage while maintaining reliable door holding when engaged.

The patent applies segmentation by dividing the mounting function into multiple independent attachment points (multiple bolts or screws distributed around the housing). Instead of relying on a single bolt that must handle all loads, the housing is secured at multiple locations, allowing each fastener to share the shear stress load. This segmentation of the mounting system maintains relatively simple installation procedures while significantly increasing the overall shear resistance and preventing housing pivoting, thus resolving the contradiction between ease of manufacture and structural strength.