公开(公告)号：US4174673A

公开(公告)日：1979-11-20

申请号：US893852

申请日：1978-04-06

Applicant: Wei-Ling Tung ,  Steven Kwan

Inventor： Wei-Ling Tung ,  Steven Kwan

IPC: B60C23/04

CPC classification number: B60C23/0403

Abstract: A low pressure warning cap for a pneumatic tire air valve including a generally cylindrical body having first and second ends, a cylinder adjacent the first end, a threaded connector for attachment to a conventional air valve stem of a pneumatic tire at the second end and an acting chamber connecting with and disposed intermediate the cylinder and the threaded connector, a piston disposed in the cylinder and resiliently biased toward the acting chamber, the cylinder having an opening at the first end, a deformable diaphragm disposed across the acting chamber between the threaded connector and the enlarged end, a perforated diaphragm disposed across the cylinder adjacent the opening, an elastic sack enveloping in air tight manner the first end including the opening, and a protuberance in the threaded connector to cooperate with the valve to open the valve upon attachment of the cap to valve, whereby, at a desired tire pressure, the deformable diaphragm is deformed by air from at the desired pressure to move the piston against the bias into air-tight engagement with the body to prevent passage of the air into the cylinder and, upon the occurrence thereafter of an undesirably low tire pressure, the piston is biased against this undesirably low air pressure to allow the air into the cylinder past the piston to pass by way of the perforated diaphragm and opening to inflate and rupture the sack to provide an audible indicaton of the undesirably low tire pressure.

Abstract translation: 一种用于充气轮胎空气阀的低压警告帽，包括具有第一和第二端的大致圆柱体，与第一端相邻的气缸，用于连接到第二端处的充气轮胎的常规空气阀杆的螺纹连接器， 连接并设置在气缸和螺纹连接器之间的活动室，设置在气缸中并朝向作用室弹性偏压的活塞，气缸在第一端具有开口，可变形隔膜设置在螺纹连接器 并且扩大的端部，穿过邻近开口的圆柱体设置的穿孔隔膜，包含气密方式的弹性袋，包括开口的第一端和螺纹连接器中的突起，以与阀门配合以在附接时打开阀门 由此，在期望的轮胎压力下，可变形隔膜由空气从地面变形 有效压力将活塞抵抗偏压移动到与身体气密接合以防止空气进入气缸，并且在其后出现不期望的低轮胎压力时，活塞被偏压抵抗不期望的低空气压力 允许通过活塞的空气进入气缸以通过穿孔的隔膜和开口以使袋膨胀并破裂，以提供不期望的低轮胎压力的可听见的指示。