| 摘要 |
PURPOSE: A pressure block is provided to prevent damage to protrusions because the protuberances can be restored when pressed by a load. CONSTITUTION: A pressure block(1) comprises a joint space with open bottom, a pressure block case(2), and a support. The pressure block case comprises a pressure part(22) which has an internal buffer space and a plurality of protrusions(221). Each protrusion has an additional protrusion on the top and a vent which is connected to the buffer space for letting air flow in and out according to the application of a load. The support is inserted and fixed in the buffer space. |
